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1
Wanhar Afandi. "Performance Analysis of Protection System on A 20 KV Distribution System Network at PT PLN Tutorial Shop Pematang Siantar City." Journal of Science Technology (JoSTec) 3, no. 1 (December 27, 2021): 97–101. http://dx.doi.org/10.55299/jst.v3i1.60.
Повний текст джерелаАнотація:
On era of globalization needs of electrical energy very high . In distribution of electrical energy expected could walk with good without existence interference. Distribution of electrical energy from generator until distribution to consumer expected could walk with good . In another side also often occur disturbance specifically on the distribution system power electricity . System distribution power electricity that uses cable air or cable soil often experience various interference . Frequent disturbances _ occur is disturbance symmetry or disturbance not the symmetry that can in the form of connection short one phase to land , between phase or break up wrong one or more . For knowing big current disturbance the required analysis system distribution transformer for knowing disturbances that will happen . Security setting design on network proper distribution is something effort protect equipment, system as well as needs consumer from possible disturbance occur in system distribution. Calculation current disturbance and big transformer nominal current will used as reference important in determination of transformer settings in deployment voltage to consumers
2
Wanhar Afandi. "Performance Analysis of Protection System on A 20 KV Distribution System Network at PT PLN Tutorial Shop Pematang Siantar City." Journal of Science Technology (JoSTec) 3, no. 1 (December 27, 2021): 97–101. http://dx.doi.org/10.55299/jostec.v3i1.60.
Повний текст джерелаАнотація:
On era of globalization needs of electrical energy very high . In distribution of electrical energy expected could walk with good without existence interference. Distribution of electrical energy from generator until distribution to consumer expected could walk with good . In another side also often occur disturbance specifically on the distribution system power electricity . System distribution power electricity that uses cable air or cable soil often experience various interference . Frequent disturbances _ occur is disturbance symmetry or disturbance not the symmetry that can in the form of connection short one phase to land , between phase or break up wrong one or more . For knowing big current disturbance the required analysis system distribution transformer for knowing disturbances that will happen . Security setting design on network proper distribution is something effort protect equipment, system as well as needs consumer from possible disturbance occur in system distribution. Calculation current disturbance and big transformer nominal current will used as reference important in determination of transformer settings in deployment voltage to consumers
3
Borrás-Talavera, María Dolores, Juan Carlos Bravo, and César Álvarez-Arroyo. "Instantaneous Disturbance Index for Power Distribution Networks." Sensors 21, no. 4 (February 14, 2021): 1348. http://dx.doi.org/10.3390/s21041348.
Повний текст джерелаАнотація:
The stability of power systems is very sensitive to voltage or current variations caused by the discontinuous supply of renewable power feeders. Moreover, the impact of these anomalies varies depending on the sensitivity/resilience of customer and transmission system equipment to those deviations. From any of these points of view, an instantaneous characterization of power quality (PQ) aspects becomes an important task. For this purpose, a wavelet-based power quality indices (PQIs) are introduced in this paper. An instantaneous disturbance index (ITD(t)) and a Global Disturbance Ratio index (GDR) are defined to integrally reflect the PQ level in Power Distribution Networks (PDN) under steady-state and/or transient conditions. With only these two indices it is possible to quantify the effects of non-stationary disturbances with high resolution and precision. These PQIs offer an advantage over other similar because of the suitable choice of mother wavelet function that permits to minimize leakage errors between wavelet levels. The wavelet-based algorithms which give rise to these PQIs can be implemented in smart sensors and used for monitoring purposes in PDN. The applicability of the proposed indices is validated by using a real-time experimental platform. In this emulated power system, signals are generated and real-time data are analyzed by a specifically designed software. The effectiveness of this method of detection and identification of disturbances has been proven by comparing the proposed PQIs with classical indices. The results confirm that the proposed method efficiently extracts the characteristics of each component from the multi-event test signals and thus clearly indicates the combined effect of these events through an accurate estimation of the PQIs.
4
Mohammed, Jamal Abdul-Kareem, Arkan Ahmed Hussein, and Sahar R. Al-Sakini. "Voltage disturbance mitigation in Iraq's low voltage distribution system." Indonesian Journal of Electrical Engineering and Computer Science 17, no. 1 (January 1, 2020): 47. http://dx.doi.org/10.11591/ijeecs.v17.i1.pp47-60.
Повний текст джерелаАнотація:
<p>Power distribution network in Iraq still suffers from significant problems regarding electricity distribution level. The most important problem is the disturbances that are occurring on lines voltages, which in turn, will negatively affect sensitive loads they feed on. Protection of these loads could be achieved efficiently and economically using the dynamic voltage restorer DVR when installed between the voltage source and load to inject required compensation voltage to the network during the disturbances period. The DVR mitigates these disturbances via restoring the load voltage to a pre-fault value within a few milliseconds. To control the DVR work, dq0 transformation concept and PID method with sinusoidal pulse-width modulation SPWM based converter had been used to correct the disturbances and thus enhance the power quality of the distribution network. The DVR performance was tested by MATLAB/Simulink with all kinds of expected voltage disturbances and results investigated the effectiveness of the proposed method.</p>
5
Olajuyin, E. A., and Olubakinde Eniola. "MICROGRID IN POWER DISTRIBUTION SYSTEM." International Journal of Research -GRANTHAALAYAH 7, no. 8 (July 23, 2020): 387–93. http://dx.doi.org/10.29121/granthaalayah.v7.i8.2019.687.
Повний текст джерелаАнотація:
Power is a very important instrument to the development of economy of a nation and it must be stable and available and to meet the demand of the consumers at all times. The quest for power supply has introduced a new technology called microgrid. Micro grids are regarded as small power systems that confine electric energy generating facilities, from both renewable energy sources and conventional synchronous.
Generators, and customer loads with respect to produced electric energy. It can be connected to grid or operate in islanding mode. On the other hand, the grid’s dynamics and its stability rely on the amount of stored energy in the micro grid. In a conventional power system with a large number of synchronous generators as the main sources of energy, the mechanical energy in the generators’ rotors, in the form of kinetic energy, serves as the stored energy and feeds the grids in the event of any drastic load changes or if disturbances occur. Microgrid is an alternative idea to support the grid, it can be applied in a street, estates, community or a locality (towns and villages), organizations and establishments. Load forecasting can be further extended to Organizations, Local Government, State and country to determine the energy consumption.
6
Djibo, Marounfa `., Paul Moses, and Ike Flory. "Fault Protection Considerations for MVDC Shipboard Power Systems Operating with Pulsed-Power Loads." WSEAS TRANSACTIONS ON POWER SYSTEMS 16 (August 2, 2021): 139–48. http://dx.doi.org/10.37394/232016.2021.16.14.
Повний текст джерелаАнотація:
Medium Voltage Direct Current (MVDC) power distribution architectures are of immense interest for various shipboard power applications due to their advantages over classical MVAC distribution systems with respect to power quality, power density, and efficiency. However, MVDC are far away from maturity when compared to MVAC with respect to fault detection and isolation. Currently, there are no standards available for applying MVDC protection systems in shipboard applications. Furthermore, due to the absence of zero crossings in DC waveforms and unique transient fault signatures, it is challenging to design effective protection system schemes to isolate faults via conventional protection systems. This paper investigates and analyses various types of shipboard MVDC dynamic fault behaviours and signatures under different DC bus disturbances such as: bus to ground, bus to bus to ground, and impact of Pulsed-Power Load (PPL) with and without faults on a shipboard MVDC distribution system. Furthermore, a communication-based fault detection and isolation system controller that improves upon a directional ac overcurrent relay protection system is proposed offering additional protection discrimination between faults and PPLs in MVDC systems. To validate the effectiveness of the proposed protection controller, different bus current disturbances are simulated within a time-domain electromagnetic transient simulation of a shipboard power system including a PPL system operating with different ramp rate profiles, pulse widths, peak powers, and fault locations
7
Chan, Kok Wai, Rodney H. G. Tan, and V. H. Mok. "Simulation of Power Quality Disturbances Using PSCAD." Applied Mechanics and Materials 785 (August 2015): 373–77. http://dx.doi.org/10.4028/www.scientific.net/amm.785.373.
Повний текст джерелаАнотація:
Power quality is becoming a concern in modern electrical network due to complexity of the system. To improve power quality, there needs to be analysis and research on complex power quality events systematically. Disturbances in distribution system, including sag/swell, transient, harmonic, voltage notch, and flicker that affect power quality are simulated in this research work. The comprehensive set of models are developed in PSCAD with minimum blocks and settings without compromising the essence of power quality events. This research work aims to introduce the power quality events to electrical engineering students, as well as reinforce understanding of power quality disturbances in distribution system through interactive simulation approach.
8
Hernández Chilán, Julio. "MEJORAS EN LAS PRESTACIONES DE AEROGENERADORES SINCRÓNICOS DE VELOCIDAD VARIABLE FRENTE A LOS HUECOS DE TENSIÓN." Revista de Investigaciones en Energía, Medio Ambiente y Tecnología: RIEMAT ISSN: 2588-0721 1, no. 1 (January 11, 2016): 44. http://dx.doi.org/10.33936/riemat.v1i1.208.
Повний текст джерелаАнотація:
Abstract: In the work presented are highlights that the introduction of wind turbines in a system of power, is sees limited by problems related with their behaviors facing them faults and disturbances that could occur in said system. When voltage in the system, wind turbines can be disconnected by amplifying the disturbance and its consequences. Sometimes not to use all the renewable wind energy which is available in a given natural site, due to the limitations explained above. Although is holding reserves of sources renewable of energy, its implementation practice could affect the behavior dynamic of the system of power facing disturbances. Currently, them wind turbines face them hollow of voltage dissipating the energy electric excess in form of heat, energy that is lost and not can be returned to the system of power. In this work is carried out an analysis on how to improve the performance of wind turbines for use in power distribution systems, if stored excess energy during the disturbances, which allows the use of electrical energy from small wind resources regardless of the position that windfarms in the power system are connected.
In the work presented are highlights that the introduction of wind turbines in a system of power, is sees limited by problems related with their behaviors facing them faults and disturbances that could occur in said system. When voltage in the system, wind turbines can be disconnected by amplifying the disturbance and its consequences. In sometimes not is can take advantage of all it energy wind renewable that is has in a given site natural, due to the limitations explained previously.
Index Terms: wind turbines, windfarms, power system, renewable wind energy
9
Arizaldi, Afif, S. Salahuddin, M. Muhammad, Vishal Jain, Govinda Prashad Pandey, and Manoj Jagannathrao Watane. "Short Circuit Analysis on Distribution Network 20 kV Using Etap Software." Journal of Renewable Energy, Electrical, and Computer Engineering 1, no. 2 (September 30, 2021): 49. http://dx.doi.org/10.29103/jreece.v1i2.5232.
Повний текст джерелаАнотація:
In an electric power system, electricity is generated by the power plant and then channeled to a transmission line and then distributed to consumers, in the process of distributing electrical energy, the system does not always work in normal conditions, sometimes the system can experience disturbances such as one-phase, two-phase, and three-phase disturbances. This interference can disrupt the electrical system and can damage equipment if left unchecked, therefore it is necessary to install a protection device that can decide the interference so as not to damage other equipment when a disturbance occurs. Here the protection device used is a circuit breaker. In a fault condition, the circuit breaker must be able to separate the points of the fault so as not to damage other electrical equipment. In this case, to determine the capacity of the best protection device for the system, a short circuit fault simulation is performed. To simplify the calculation process here the author uses the help of ETAP software (Electrical Transient Analysis Program).
10
Stojković, Jelena, and Predrag Stefanov. "A Novel Approach for the Implementation of Fast Frequency Control in Low-Inertia Power Systems Based on Local Measurements and Provision Costs." Electronics 11, no. 11 (June 2, 2022): 1776. http://dx.doi.org/10.3390/electronics11111776.
Повний текст джерелаАнотація:
Transitioning towards carbon-free energy has brought severe difficulties related to reduced inertia in electric power systems. Regarding frequency stability, low-inertia systems are more sensitive to disturbance, and traditional frequency control is becoming insufficient to maintain frequency within acceptable limits. Consequently, there is a necessity for faster frequency support that can be activated before the primary frequency control and that can decelerate further frequency decay. This paper proposes a local control strategy for a multi-stage fast frequency response (FFR) provided as an ancillary service that considers the location of the disturbance and the distribution of system inertia. The novelty of the presented control strategy is the ranking of FFR resources by price, which takes the economic component into consideration. The proposed control is simple, based only on RoCoF measurements that trigger the activation of FFR resources. Its advantage over other methods is the ability to adapt the FFR resource response to the disturbance without complex calculations and the ability to ensure a bigger response closer to the disturbance, as well as in low-inertia parts of the system. In that way, there is a bigger activation of resources in the parts of the system that are more endangered by disturbances, which, as a result, minimizes the propagation of the disturbance’s impact on system stability. The applicability of the presented method is demonstrated in a simple 3-area power system and IEEE 68-bus system implemented in MATLAB/Simulink. The results show that the proposed control enables the largest response closer to the disturbance, thus mitigating the propagation of the disturbance. Furthermore, the results confirm that the proposed control enables lower provision costs and more support in low-inertia areas that are more vulnerable to disturbances.
11
Mollaei, Nader, and Seyyed Hadi Mousavi. "Application of a Hadoop-based Distributed System for Offline Processing of Power Quality Disturbances." International Journal of Power Electronics and Drive Systems (IJPEDS) 8, no. 2 (June 1, 2017): 695. http://dx.doi.org/10.11591/ijpeds.v8.i2.pp695-704.
Повний текст джерелаАнотація:
Electric power quality is a critical issue for electric utilities and their customers and identification of the power quality disturbances is an important task in power system monitoring and protection. Offline processing of power quality disturbances provides an economic alternative for electric distribution companies, not capable of buying enough number of power quality analyzers for monitoring the disturbances online. Due to the wide frequency range of the disturbances which may happen in a power system, a high sampling rate is necessary for digital processing of the disturbances. Therefore, a large volume of data must be processed for this purpose for each node of an electric distribution network and such a processing has not yet been practical. However, thanks to the rapid developments of digital processors and computer networks, processing big databases is not so hard today. Apache Hadoop is an open-source software framework that allows for the distributed processing of large datasets using simple programming models. In this paper, application of Hadoop distributed computing software for offline processing of power quality disturbances is proposed and it is shown that this application makes such a processing possible and leads to a very cheaper system with widespread usage, compared to the power quality analyzers.
12
Moon, Sang-Keun, Jong-Hyuk Lee, Hong-Rok Lim, Sang-Won Oh, Dae-Won Seo, and Jin-O. Kim. "Power Quality Feature Modelling of Waveform Disturbances for Distribution System Diagnosis." IOP Conference Series: Earth and Environmental Science 159 (June 2018): 012022. http://dx.doi.org/10.1088/1755-1315/159/1/012022.
Повний текст джерела
13
Farooqi, Awais, Muhammad Murtadha Othman, Ahmad Farid Abidin, Shahril Irwan Sulaiman, and Mohd Amran Mohd Radzi. "Mitigation of power quality problems using series active filter in a microgrid system." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 4 (December 1, 2019): 2245. http://dx.doi.org/10.11591/ijpeds.v10.i4.pp2245-2253.
Повний текст джерелаАнотація:
<p>Dynamic voltage restorer (DVR) is a series active filter device that is used to protect sensitive loads from power quality issues such as voltage sag, swell, harmonics or disturbances. This implies that the DVR is capable to mitigate power quality disturbances at load terminal. Harmonic is a major power quality problem polluting distribution network causing the end-user equipment to fail operating due to the occurrence of disturbances in voltage, current or frequency. This paper discusses on the DVR used as the proposed technique to mitigate the voltage sag and swell in a distribution network connected with energy storage system and mini-hydro turbine system.</p>
14
Sekar, Kavaskar, Karthick Kanagarathinam, Sendilkumar Subramanian, Ellappan Venugopal, and C. Udayakumar. "An Improved Power Quality Disturbance Detection Using Deep Learning Approach." Mathematical Problems in Engineering 2022 (May 21, 2022): 1–12. http://dx.doi.org/10.1155/2022/7020979.
Повний текст джерелаАнотація:
Recently, the distribution network has been integrated with an increasing number of renewable energy sources (RESs) to create hybrid power systems. Due to the interconnection of RESs, there is an increase in power quality disturbances (PQDs). The aim of this article was to present an innovative method for detecting and classifying PQDs that combines convolutional neural networks (CNNs) and long short-term memory (LSTM). The disturbance signals are fed into a combined CNN and LSTM model, which automatically recognizes and classifies the features associated with power quality disturbances. In comparison with other methods, the proposed method overcomes the limitations associated with conventional signal analysis and feature selection. Additionally, to validate the proposed method's robustness, data samples from a modified IEEE 13-node hybrid system are collected and tested using MATLAB/Simulink. The results are good and encouraging.
15
Mohammed, Ali Basim, Mohd Aifaa Mohd Ariff, and Sofia Najwa Ramli. "Power quality improvement using dynamic voltage restorer in electrical distribution system: an overview." Indonesian Journal of Electrical Engineering and Computer Science 17, no. 1 (January 1, 2020): 86. http://dx.doi.org/10.11591/ijeecs.v17.i1.pp86-93.
Повний текст джерелаАнотація:
This paper represents a review of the dynamic voltage restorer for power quality improvement in the electrical distribution system. Over the past 50 years, issues concerning power quality have steadily increased, to prevent the effect of the voltage disturbances, some of the devices are put as a solution to these problems such as distribution static compensator (D- STATCOM), solid-state transformer (SST), uninterruptible power supply (UPS), dynamic voltage restorer (DVR). The DVR is one of the economic solutions to overcome the voltage disturbances like voltage sag/swell and harmonics. It is widely used to mitigate the voltage disturbances in the power distribution system, especially in the medium and low distribution networks. This paper aims to review the implementation of the DVR in the system integrated with renewable energy resources. This is important because the future of electricity business is moving towards renewable energy and also provides a thorough discussion of the typical components, controllers, compensation methods, and the application of DVR. The extensive review of the technology aims to ease and speed up the development and the advancement of the DVR in the near future.
16
Hu, Yajing, Jing Liu, and Xiandong Xu. "Dynamic Interactions between Local Energy Systems Coupled by Power and Gas Distribution Networks." Energies 15, no. 22 (November 10, 2022): 8420. http://dx.doi.org/10.3390/en15228420.
Повний текст джерелаАнотація:
Supplied with electricity and natural gas, local energy systems (LESs) with gas-fired generations increase the operational flexibility of urban energy supply. However, the increasing usage of these LESs may lead to adverse impacts on the urban energy system supply via power and/or gas distribution networks. Dynamic interactions between the LESs, electricity, and gas networks subject to different disturbances need to be investigated due to the complexity of the problem. To address this issue, this paper first presents the topology and operating mode of the LESs as well as the relationship with power and gas networks. Second, an extended microturbine model is developed to reflect the nonlinear dynamic propagation of disturbances between the two networks. A general model of the interconnected LESs is developed to analyze the mutual impacts between gas and electricity networks under different modes. Finally, an iterative method is proposed to simulate the mechanism of disturbance propagation between the electricity network, gas network, and LESs, incorporating the impacts of loads and renewables. Case studies reveal that simultaneous regulation of multiple gas-fired generators would reduce the minimum pressure to 50% of the steady-state value. The resulted pressure drop is even lower than the case with higher total gas demand but only one gas-fired generator regulated. Moreover, it is shown that state fluctuations of the gas system last 20 times longer than the electricity system within the LESs. The electrical link between LESs, such as soft opening point with shorter response time, could smooth the fluctuations.
17
Lin, Whei Min, Chia Sheng Tu, and Ting Chia Ou. "Support Vector Machine Based Voltage Relays for Voltage Disturbance Detection in Micro-Distribution Systems." Applied Mechanics and Materials 291-294 (February 2013): 2084–90. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.2084.
Повний текст джерелаАнотація:
This study proposes combining fuzzy inference system and support vector machine based voltage relays for voltage disturbance detection in micro-distribution systems (MDSs). Moreover, the coordination characteristic curves of the trigger time versus dynamic errors are proposed for under-voltage and over-voltage protection. Modified coordination characteristic curves use a critical trigger time to isolate the faults. An support vector machine (SVM) is a multi-layer decision-making model, which detects voltage disturbances, such as voltage swell, voltage sag, voltage unbalance, and faults. Computer simulations are conducted, using an IEEE 30-bus power system and micro-distribution systems, to show the effectiveness of the proposed voltage relays.
18
Suraya, S., S. M. Irshad, M. F. Azeem, S. F. Al-Gahtani, and M. H. Mahammad. "Multiple Voltage Disturbance Compensation in Distribution Systems using DVR." Engineering, Technology & Applied Science Research 10, no. 3 (June 7, 2020): 5732–41. http://dx.doi.org/10.48084/etasr.3485.
Повний текст джерелаАнотація:
The subject of power quality is gaining much interest nowadays. With the sophisticated sensitive electrical devices available in the market, power stations should ensure qualified and eminent power to the point of utilization. Bad voltage conditions in a power system can cause a malfunction at the point of utilization. Dynamic voltage restorer (DVR) is a reliable power electronic offsetting device which when engaged in the power system is effectual in the operation of compensating voltage sag/swell. In this research work, a DVR for offsetting multiple voltage disturbances in a power system is presented and a novel control strategy to trigger power switches in DVR is proposed. The proposed novel control methodology is compared with Synchronous Reference Frame (SRF) theory-controlled DVR. The simulation model is designed and the analysis with MATLAB/SIMULINK is presented
19
Yankson, Samuel, and Mahdi Ghamkhari. "Transactive Energy to Thwart Load Altering Attacks on Power Distribution Systems." Future Internet 12, no. 1 (December 24, 2019): 4. http://dx.doi.org/10.3390/fi12010004.
Повний текст джерелаАнотація:
The automatic generation control mechanism in power generators comes into operation whenever an over-supply or under-supply of energy occurs in the power grid. It has been shown that the automatic generation control mechanism is highly vulnerable to load altering attacks. In this type of attack, the power consumption of multiple electric loads in power distribution systems is remotely altered by cyber attackers in such a way that the automatic generation control mechanism is disrupted and is hindered from performing its pivotal role. The existing literature on load altering attacks has studied implementation, detection, and location identification of these attacks. However, no prior work has ever studied design of an attack-thwarting system that can counter load altering attacks, once they are detected in the power grid. This paper addresses the above shortcoming by proposing an attack-thwarting system for countering load altering attacks. The proposed system is based on provoking real-time adjustment in power consumption of the flexible loads in response to the frequency disturbances caused by the load altering attacks. To make the adjustments in-proportion to the frequency disturbances, the proposed attack-thwarting system uses a transactive energy framework to establish a coordination between the flexible loads and the power grid operator.
20
Dwi Ajiatmo, Imam Robandi, and Machrus Ali. "Analisis Gangguan Pada Sistem Tenaga Listrik Jawa Bali 500 kV Menggunakan Power World Simulator." Jurnal Intake : Jurnal Penelitian Ilmu Teknik dan Terapan 10, no. 1 (April 22, 2019): 35–41. http://dx.doi.org/10.48056/jintake.v10i1.50.
Повний текст джерелаАнотація:
Short circuit is one type of interference that often occurs in electric power systems. The interference if it lasts a long time will affect the quality and continity of electrical power distribution as well as the reliability and safety of the equipment on the system. To minimize the possibility of interference and to minimize the consequences caused by interference, an analysis of disturbances in the electric power system is needed. This study discusses the classification and analysis of disturbances in the electric power system. The type of interference in the electric power system is classified into two, namely symmetry and non-symmetrical interference. Symmetry disturbances are three phase disturbances which are described by the equation of the sequence of the symmetry component system. Sequence equations from the symmetry component system are positive sequence equations, negative sequence equations, and zero sequence equations. Non-symmetrical interference is a disorder that often occurs in electric power systems, namely the interference of one network to the ground, network interference to the network and interference of two networks to the ground. This research is to classify and to analyze the types of disturbances in the Java-Bali electric power system 500 kV 20 buses in the form of a single line diagram, using Power World Simulator and ETAP Software applications. The simulation results are calculated and display the simulation design of the power system with the tools contained in the program.
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Ajiatmo, Dwi, Imam Robandi, Machrus Ali, and Betta Aidya Suroya. "Analisis Gangguan Pada Sistem Tenaga Listrik Jawa Bali 500 kV Menggunakan Power World Simulator." Jurnal Intake : Jurnal Penelitian Ilmu Teknik dan Terapan 10, no. 1 (April 22, 2019): 35–41. http://dx.doi.org/10.32492/jintake.v10i1.793.
Повний текст джерелаАнотація:
Short circuit is one type of interference that often occurs in electric power systems. The interference if it lasts a long time will affect the quality and continity of electrical power distribution as well as the reliability and safety of the equipment on the system. To minimize the possibility of interference and to minimize the consequences caused by interference, an analysis of disturbances in the electric power system is needed. This study discusses the classification and analysis of disturbances in the electric power system. The type of interference in the electric power system is classified into two, namely symmetry and non-symmetrical interference. Symmetry disturbances are three phase disturbances which are described by the equation of the sequence of the symmetry component system. Sequence equations from the symmetry component system are positive sequence equations, negative sequence equations, and zero sequence equations. Non-symmetrical interference is a disorder that often occurs in electric power systems, namely the interference of one network to the ground, network interference to the network and interference of two networks to the ground. This research is to classify and to analyze the types of disturbances in the Java-Bali electric power system 500 kV 20 buses in the form of a single line diagram, using Power World Simulator and ETAP Software applications. The simulation results are calculated and display the simulation design of the power system with the tools contained in the program.
22
Prasad, Miska, and A. K. Akella. "Comparison of Voltage Swell Characteristics in Power Distribution System." International Journal of Electrical and Electronics Research 4, no. 3 (September 30, 2016): 67–73. http://dx.doi.org/10.37391/ijeer.040302.
Повний текст джерелаАнотація:
In the present world with the growing demand of electricity the quality of voltage becoming a vital problem. Voltage swell is one of the short term voltage disturbances that occur frequently in power distribution system. Voltage swell characterization is an important, because power quality analysis, troubleshooting, diagnosis, and mitigation policy could be carried out only after characterizing the voltage swells. The magnitude, duration, and phase-angle jump are the essential characteristics of voltage swell are considered in this work. In this paper, MATLAB/SIMULINK with SimPower System is used to simulate the proposed system to show the comparative performance of significant characteristics of voltage swells under power distribution system fault, energizing a capacitor bank and sudden switching off a heavy linear and nonlinear load.
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Martinez, Raquel, Pablo Castro, Alberto Arroyo, Mario Manana, Noemi Galan, Fidel Simon Moreno, Sergio Bustamante, and Alberto Laso. "Techniques to Locate the Origin of Power Quality Disturbances in a Power System: A Review." Sustainability 14, no. 12 (June 17, 2022): 7428. http://dx.doi.org/10.3390/su14127428.
Повний текст джерелаАнотація:
The complexity in the power system topology, together with the new paradigm in generation and demand, make achieving an adequate level of supply quality a complicated goal for distribution companies. The electrical system power quality is subject to different regulations. On one hand, EN-50160 establishes the characteristics of the voltage supplied by public electricity networks, therefore affecting distribution companies. On the other hand, the EN-61000 series of standards regulates the electromagnetic compatibility of devices connected to the network, therefore affecting the loads. Power companies and device manufacturers are both responsible and affected in the issue of quality of supply. Despite the regulations, there are certain aspects of the supply quality that are not solved. One of the most important is the location of the disturbance’s origin. This paper presents a review of the main techniques to locate the disturbance’s origin in the electric network through two approaches: identification of the disturbance’s cause and the location of the origin.
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Abibie, Hafid, and Sulistyowati. "Kajian Koordinasi Sistem Proteksi Pada Sistem Transmisi 70 kV GI Banaran Kediri Transmission Line Bay Pare." ELPOSYS: Jurnal Sistem Kelistrikan 7, no. 3 (November 4, 2020): 51–57. http://dx.doi.org/10.33795/elposys.v7i3.21.
Повний текст джерелаАнотація:
The substation is one of the components in the electric power distribution system which plays a very important role because it is the connection between electricity services to customers. In the electric power distribution system, there are disturbances that often occur, one of which is a short circuit. For that, the way to overcome this is using the Distance Relay protection system, OCR / GFR and DEF. The purpose of writing this research is to determine the value of setting relay distance, setting Over Current Rele and Directional Earth Fault relay in order to secure the 70 kV transmission network connected to GI Banaran, which is then simulated using DigSILENT 15.1 software on the Pare line by calculating symmetrical and asymmetrical disturbances. including 3-phase disturbance on February 1, 2018. The simulation results show that the 3-phase disturbance occurs at Zone 1 relay distance of the Banaran Bay Pare substation with a trip time of 0.02 seconds with a fault impedance of 0.083 ohms below the relay impedance value of 0.887 ohms. The coordination between the distance relay on the side of the Banaran Bay Pare substation has worked well because there is no error reading the relay when it will cut off the disturbance.
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Firmansyah, Anton, Andri Suyadi, and M. Bintang Satriaoktarian. "Unjuk Kerja Over Current Relay Pada Incoming dan Outgoing Transformer Daya #1 60 MVA Gardu Induk Kenten menggunakan ETAP 19.0.1." Jurnal Tekno 19, no. 1 (April 6, 2022): 01–10. http://dx.doi.org/10.33557/jtekno.v19i1.1613.
Повний текст джерелаАнотація:
Abstract
The Kenten substation is part of the unitary distribution of electricity transmission where there are equipment such as switchgear, transformers, protection equipment, and control equipment. The Kenten substation functions as a receiver for supply from high voltage to the distribution medium voltage system to be distributed to consumers. An electric power system can experience disturbances from inside or outside the substation, including damage to the generator, broken conductors, short circuit disturbances due to lightning strikes. Therefore, the electric power system has safety equipment to secure the equipment from interference and avoid damage. With the protection system does not hinder the distribution of electric power to the load. Based on the data received, there have been several disturbances to the feeder, including in March 2021 there has been a short-circuit fault in the volvo feeder in the electrical system of PT. PLN (Persero) substation Kenten UPT Palembang Short-circuit faults of these phases can result in a transformer that results in blackouts throughout the feeder connected to the transformer. Disturbances that occur in the electrical system of the Kenten Substation, especially in this feeder, make the OCR protection system on the feeder work to protect the equipment at the substation from damage.
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Sekar, Kavaskar, and Nalin Kant Mohanty. "High impedance fault detection in distribution system." International Journal of Advances in Applied Sciences 8, no. 2 (June 1, 2019): 95. http://dx.doi.org/10.11591/ijaas.v8.i2.pp95-102.
Повний текст джерелаАнотація:
<p>High impedance faults (HIFs) present a huge complexity of identification in an electric power distribution network (EPDN) due to their characteristics. Further, the growth of non-linear load adds complexity in HIF detection. One primary challenge of power system engineers is to reliably detect and discriminate HIFs from normal distribution system load and other switching transient disturbances. In this study, a novel HIF detection method is proposed based on the simulation of an accurate model of an actual EPDN study with real data. The proposed method uses current signal alone and does not require voltage signal. Wavelet transform (WT) is used for signal decomposition to extract statistical features and classification of HIF into Non-HIF (NHIF) by Neural Networks (NNs). The simulation study of the proposed method provides good, consistent and powerful protection for HIF.</p>
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Rahim Abdullah, Abdul, Nur Hafizah Tul Huda Ahmad, N. A. Abidullah, N. H. Shamsudin, and M. H. Jopri. "Performance Evaluation of Real Power Quality Disturbances Analysis Using S-Transform." Applied Mechanics and Materials 752-753 (April 2015): 1343–48. http://dx.doi.org/10.4028/www.scientific.net/amm.752-753.1343.
Повний текст джерелаАнотація:
Power quality is main issue because of the impact to electricity suppliers, equipments, manufacturers and user.To solve the power quality problem, an analysis of power quality disturbances is required to identify and rectify any failures on power system. Most of researchers apply fourier transform in power quality analysis, however the ability of fourier transform is limited to spectral information extraction that can be applied on stationary disturbances. Thus, time-frequency analysis is introduced for analyzing the power quality distubances because of the limitation of fourier transform. This paper presents the analysis of real power quality disturbances using S-transform. This time-frequency distribution (TFD) is presented to analyze power quality disturbances in time-frequency representation (TFR). From the TFR, parameters of the disturbances such as instantaneous of root mean square (RMS), fundamental RMS, total harmonic distortion (THD), total nonharmonic distortion (TnHD) and total waveform distortion (TWD) of the disturbances are estimated. The experimental of three phase voltage inverter and starting motor are conducted in laboratory to record the real power quality disturbances. The disturbances are recorded via data logger system which is mplemented using LabVIEW while the analysis is done using Matlab in offline condition. The results show that S-transform gives good performance in identifying, detecting and analyzing the real power quality disturbances, effectively.
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Saeed, Ismael Kareem, and Kamal Sheikhyounis. "Power quality improvement of distribution systems asymmetry caused by power disturbances based on particle swarm optimization-artificial neural network." Indonesian Journal of Electrical Engineering and Computer Science 25, no. 2 (February 1, 2022): 666. http://dx.doi.org/10.11591/ijeecs.v25.i2.pp666-679.
Повний текст джерелаАнотація:
With an increase of non-linear load in today’s electrical power systems, the rate of power quality drops and the voltage source and frequency deteriorate if not properly compensated with an appropriate device. Filters are most common techniques that employed to overcome this problem and improving power quality. In this paper an improved optimization technique of filter applies to the power system is based on a particle swarm optimization with using artificial neural network technique applied to the unified power flow quality conditioner (PSO-ANN UPQC). Design particle swarm optimization and artificial neural network together result in a very high performance of flexible AC transmission lines (FACTs) controller and it implements to the system to compensate all types of power quality disturbances. This technique is very powerful for minimization of total harmonic distortion of source voltages and currents as a limit permitted by IEEE-519. The work creates a power system model in MATLAB/Simulink program to investigate our proposed optimization technique for improving control circuit of filters. The work also has measured all power quality disturbances of the electrical arc furnace of steel factory and suggests this technique of filter to improve the power quality.
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Ogunboyo, Taiwo. "A Survey of Power Quality Enhancement in Distribution of System of Lines Using Distribution Static Synchronous Compensator." Science View Journal 3, no. 1 (April 15, 2022): 163–70. http://dx.doi.org/10.55989/babz6904.
Повний текст джерелаАнотація:
Distribution Static Synchronous Compensator (DSTATCOM) is a power electronics tool joined in parallel to the system of lines to mitigate the power quality disruptions such as electric potential swell, sag, electric potential imbalance, electric potential and current harmonics voltage spike, flicker, electric potential fluctuations related to the secondary system of lines.. DSTATCOM provides electric potential control and adequate mitigation for disturbances related with distribution of system lines in community. DSTATCOM is a3-phase device that produces/ take in the dynamic power which the final outcome can transformed suitable situation to deal with specific and accurate able to change quantity of the system of lines. This article offers a critical look to the researches on the DSTATCOM for energy quality enhancement in electric distribution systems. It explains the basic elements and configuration of DSTATCOM, the operation mode of DSTATCOM, principle of operation of DSTATCOM, DSTATCOM configurations, and DSTATCOM control strategies in the electric distribution network.
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Hong, Tianxing. "Identification of Contact Relationship of Electrical Engineering Distribution Network with Two-Dimensional Wavelet Threshold Deep Neural Network." Mobile Information Systems 2022 (August 17, 2022): 1–11. http://dx.doi.org/10.1155/2022/3611623.
Повний текст джерелаАнотація:
With the improvement of electrification in power systems, accurate and rapid fault location helps to repair faults, which is of great significance to the stability of distribution network operation. As an important part of power distribution in the power system, the electrical engineering distribution network is directly connected to the power transmission system and power end users. Its safety and reliability are related not only to the power sales interests of power companies, but also to the power users’ rights and interests in power consumption. In this paper, an improved threshold based on the peak-sum ratio (PSR) is proposed, the time-frequency features in the disturbance signal are extracted through the continuous transformation of the two-dimensional wavelet threshold deep neural network to generate the disturbance time-frequency map of the electrical engineering distribution network, and then the deep learning model is used to analyze the model. After the classification performance is continuously optimized, the signal disturbance identification of electrical engineering distribution network is realized. By calculating the PSR of the distribution network, the correction factor can adaptively adjust the general threshold according to the noise distribution characteristics of different disturbance signals. By analyzing the data one by one, it can be seen that the improved threshold function has obvious advantages in the input signal-to-noise ratio of 10–12 dB, 16–18 dB, and 21–26 dB. At 13 dB, 14 dB, 20 dB, 27 dB, and 28 dB, the SNR difference of the distribution network is very small, and at 15 dB, 19 dB, 29 dB, and 30 dB, it is slightly inferior, but its denoising effect is generally better. The example results have shown that the recognition accuracy of the two-dimensional wavelet threshold denoising method in a noise-free environment has been effectively improved, and it has a certain anti-noise performance. The method proposed in this study has few feature extraction steps, is easy to implement, and is suitable for more types of disturbances.
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Gonçalves, Marceli N., and Marcelo M. Werneck. "Optical Voltage Transformer Based on FBG-PZT for Power Quality Measurement." Sensors 21, no. 8 (April 12, 2021): 2699. http://dx.doi.org/10.3390/s21082699.
Повний текст джерелаАнотація:
Optical Current Transformers (OCTs) and Optical Voltage Transformers (OVTs) are an alternative to the conventional transformers for protection and metering purposes with a much smaller footprint and weight. Their advantages were widely discussed in scientific and technical literature and commercial applications based on the well-known Faraday and Pockels effect. However, the literature is still scarce in studies evaluating the use of optical transformers for power quality purposes, an important issue of power system designed to analyze the various phenomena that cause power quality disturbances. In this paper, we constructed a temperature-independent prototype of an optical voltage transformer based on fiber Bragg grating (FBG) and piezoelectric ceramics (PZT), adequate to be used in field surveys at 13.8 kV distribution lines. The OVT was tested under several disturbances defined in IEEE standards that can occur in the electrical power system, especially short-duration voltage variations such as SAG, SWELL, and INTERRUPTION. The results demonstrated that the proposed OVT presents a dynamic response capable of satisfactorily measuring such disturbances and that it can be used as a power quality monitor for a 13.8 kV distribution system. Test on the proposed system concluded that it was capable to reproduce up to the 41st harmonic without significative distortion and impulsive surges up to 2.5 kHz. As an advantage, when compared with conventional systems to monitor power quality, the prototype can be remote-monitored, and therefore, be installed at strategic locations on distribution lines to be monitored kilometers away, without the need to be electrically powered.
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Fauzi, Adryan Fahri Zul, Agus Kiswantono, and Saidah Saidah. "Power Outage Sensing Device based on IOT for Service Quality Evaluation in the PLN Distribution System." ELKHA 13, no. 2 (October 22, 2021): 155. http://dx.doi.org/10.26418/elkha.v13i2.43741.
Повний текст джерелаАнотація:
In overcoming electrical disturbances, PLN implements an equipment protection system that aims to reduce the areas experiencing power outage. However, this protection system has not been integrated with the SCADA system. As a parameter to maintain customer service continuity, PLN uses customer-based indexes, i.e., the Customer Average Interruption Duration Index (CAIDI) and Customer Average Interruption Frequency Index (CAIFI). In the calculation of those index values, the record of power outage occurrence at PLN is still not accurate because the duration and frequency of power outage based on customer complaints. In this study, a Power Outage Sensing device is installed on the secondary distribution system transformer 380/220 which can ensure the location, record the frequency and duration of power outage and serve customers in real time based on IOT using WEMOS D1 and optocoupler sensors which can then be accessed on a web. In its implementation, all power outage is recorded in the database and can be accessed on the web interface. This device can speed up the recovery of disturbances in the system after an outage and perform accurate CAIDI and CAIFI index calculations as customer service evaluations.
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Ogunboyo, Patrick Taiwo, Remy Tiako, and Innocent E. Davidson. "Application of Dynamic Voltage Restorer for Power Quality Improvement in Low Voltage Electrical Power Distribution Network: An Overview." International Journal of Engineering Research in Africa 28 (January 2017): 142–56. http://dx.doi.org/10.4028/www.scientific.net/jera.28.142.
Повний текст джерелаАнотація:
Dynamic Voltage Restorer (DVR) is a series connected power electronics based custom power device that is used to improve voltage disturbances in low voltage electrical power distribution network. Power quality requirement is one of the most important concerns for power system. The parts of the DVR is made up of voltage source inverter, injection/booster transformer, a harmonic filter, an energy storage device and a bypass switch. The DVR is used to inject three phase voltage in series and in synchronism with the network voltages in order to compensate voltage disturbances with a benefit of active /reactive power control. This paper presents a review of the researches on the dynamic voltage restorer application for power quality improvement in low voltage electrical power distribution networks. It describes power quality issues, principle of operation of DVR, basic components of DVR, DVRs control topologies in distribution network, DVR control strategies and compensation techniques.
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A. Ebadi Zahedan, F. Adabi, and S. Soleymani. "Frequency and Voltage Stability of Distribution Network using Photovoltaic Stabilization System and Battery Storage System." December 2022 4, no. 4 (December 16, 2022): 257–76. http://dx.doi.org/10.36548/jeea.2022.4.004.
Повний текст джерелаАнотація:
In a power system, various factors such as changes in generator output power due to load changes and different types of short circuits may change the network frequency/voltage as a consequence of changes in network condition. These volatilities in frequency/voltage may cause system frequency/voltage instability. Among different devices used for power system stability, stabilizers are the most important equipment for network stabilization and generator synchronization. In this paper, a photovoltaic system accompanied by battery storage system is used to improve the power system stability following voltage/frequency sudden variations as a result of unpredicted events in the distribution network. To do that, an IEEE 14-bus standard test network is simulated in MATLAB/Simulink, and the performance of the proposed system after different common disturbances is investigated. The results verify the performance of the proposed stabilizer so that it maintains the system stability successfully with zero percent deviation from the original state of the network.
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Shahbudin, Shahrani, Zaki Firdaus Mohmad, Saiful Izwan Suliman, Murizah Kassim, and Roslina Mohamad. "Classification of Power Quality Disturbances at Transmission System using Support Vector Machines." Indonesian Journal of Electrical Engineering and Computer Science 6, no. 2 (May 1, 2017): 310. http://dx.doi.org/10.11591/ijeecs.v6.i2.pp310-317.
Повний текст джерелаАнотація:
<p>Power Quality has become one of the important issues in modern smart grid environment. Smart grid generally utilizes computational intelligence method from the generation of electricity to electricity distribution to the customers. This is done for the safety, reliability, tenacity and efficiency of the system. The classification of power disturbances has become a major topic in maintaining power quality. These disturbances occur due to faults, natural causes, load switching, energizing transformer, starting large motor, as well as utilization of power electronic devices. The key issue is about maintaining the continuous supply of electricity to the end-users without any problem. If a problem occurs, it might increase the production cost significantly especially to large-scale industries. In this paper, S-transform is used to extract distinctive features of real data from transmission system, and Support Vector Machine was utilized to classify four types PQ disturbances namely, voltage sag, interruption, transient and normal voltage. Results obtained indicate that performance of the One Against One classifier produces high accuracy using k-fold cross validation and RBF kernel.</p>
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Mansor, Muhammad Alif, Muhammad Murtadha Othman, Ismail Musirin, and Siti Zaliha Mohammad Noor. "Dynamic voltage restorer (DVR) in a complex voltage disturbance compensation." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 4 (December 1, 2019): 2222. http://dx.doi.org/10.11591/ijpeds.v10.i4.pp2222-2230.
Повний текст джерелаАнотація:
<p>Nowadays, a distribution network is operating in a stressful manner because of a complex voltage disturbance stirred by its nonlinear, intensified, sensitive and complex loading condition with vast proliferation of electronic equipment required for the integration of renewable energy. A distribution network that mostly inflicted by the complex voltage disturbance can be referred to as the merge of stationary voltage disturbances with a short duration voltage disturbance under a nonlinear loading condition. Therefore, the dynamic voltage restorer (DVR) integrating with the battery bank will have enough energy storage to overcome long and deep complex voltage disturbance that occurs in a distribution network installed with the photovoltaic (PV) system. The results are obtained with satisfactorily findings in compensating the complex voltage disturbance using DVR.</p>
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Zhang, Qian, Ya-Gang Wang, Fei-Fei Lee, Wei Zhang, and Qiu Chen. "Performance Assessment of Cascade Control System with Non-Gaussian Disturbance Based on Minimum Entropy." Symmetry 11, no. 3 (March 14, 2019): 379. http://dx.doi.org/10.3390/sym11030379.
Повний текст джерелаАнотація:
Due to the fact that cascade control can improve the single-loop’s performance well and reduce the integral error from disturbance response, it has been one of the most important control strategies in industrial production, especially in thermal power plant and chemical engineering. However, most of the existing research is based on the Gaussian system and other few studies on the non-Gaussian cascade disturbance system also have obvious defects. In this paper, an effective control loop performance assessment (CPA) of cascade control system for many non-Gaussian distributions even the unknown mixture disturbance noise has been proposed. Compared to the minimum variance control (MVC) approach, the minimum entropy control (MEC) method can obtain a more accurate estimate. In this method, like MVC, the primary loop output and secondary loop output can be represented as invariant and dependent terms, then adopted estimated distribution algorithm (EDA) is used to achieve the system model and disturbances. In order to show the effectiveness of MEC, some simulation examples based on different perturbations are given.
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Shulzhenko, S. V. "Statistical processing of wind and solar PV generation variability for assessment of additional power system flexibility." Problems of General Energy 2021, no. 1 (March 24, 2021): 14–28. http://dx.doi.org/10.15407/pge2021.01.014.
Повний текст джерелаАнотація:
To solve the actual task of assessing additional flexible generation needed to smooth variable renewable energies (VRE) disturbances in the Power Systems worldwide the original method for statistical processing of wind and solar PV generation variability data was proposed in the article. The proposed method allows processing the historical data of VRE day-by-day and hour-to-hour generation and assessing the levels of potential disturbances this type of generation could cause. These disturbances should be smoothened in the Power System by others, usually conventional generators at least to ensure grid stability and electricity quality. Currently, at the stage of the power systems starts transformation, the sources of power system flexibility basically are the power plants whose individual flexibility is characterized by three dimensions: adjustability, ramping and lead time. Lack of flexible generation causes VRE curtailments that negatively affect economic efficiency of such clean generation. From the other hand, the improvement of existing power plants flexibility requires an essential investments and time to retrofit them, and because of that the important question - what is the required level of power system flexibility is needed to smooth current and future VRE generation. The results of statistical data processing for wind and solar PV hour-by-hour power output changes allow accepting the hypothesis about the normal distribution of these data sets. The article presents the key parameters of theoretical normal distributions are calculated for wind and solar PV data sets for 2019 and 2020 as a whole, and also for winter and summer seasons, which allow obtaining a more precise assessment of variability levels for renewables, especially for solar PV hour-by-hour generation changes. The assessments obtained in the article also could be used as the first step for more efficient management of the electricity market, for instance, forecasting the required level of flexible generation or ancillary services market for intraday power system balancing. Keywords: variable renewable energy, power system, flexibility, generation profile, statistical data processing
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Iqbal, Anzar, and Pooja. "Intrusion Detection in Smart Grid Using Machine Learning Approach." Journal of Computational and Theoretical Nanoscience 16, no. 9 (September 1, 2019): 3808–16. http://dx.doi.org/10.1166/jctn.2019.8254.
Повний текст джерелаАнотація:
One among the most unpredictable cyber physical systems accessible around the globe is Smart Grid. The fundamental motivation behind smart grid is to utilize transmission alongside distribution framework to keep up satisfactory stream of power from generation systems to end clients. The disturbances in power are exceptionally erratic on account of the utilization of different characteristic and man-made sources. Control administrator are for the most part dependent on the unsettling influences of power system for their response and after that make specific response based on these occasions. Humans can’t identify the different cyber-attacks over the power frameworks, since attackers are sufficiently brilliant to cover the tracks. To recognize the different cyber-attacks and separating different power system aggravations, Machine learning is an improving method utilized and consequently people, using this strategy, can make better decisions regarding the cause for power disturbances by focusing mainly on the cyber-attacks. Therefore, we investigate different Machine learning strategies as a methods for Detection and classification of these attacks and furthermore examine practical utilization of these procedures as an improvement to past power system architectures.
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Jurnal, Redaksi Tim. "ANALISA PROTEKSI DIFFERENSIAL PADA GENERATOR DI PLTU SURALAYA." Energi & Kelistrikan 9, no. 1 (November 26, 2018): 84–92. http://dx.doi.org/10.33322/energi.v9i1.51.
Повний текст джерелаАнотація:
Power plants produce electrical energy that will be distributed to consumers. Hence, the power plant is expected to be in a condition which means it can reliably provide electricity continuously with good quality. So as to improve the reliability and continuity of service, the operation of power systems require a safety equipment or protection system to prevent disturbances that disrupt the system. Protection system is an important component to maintain the continuity and reliability of the distribution of electrical energy. Protection system serves to protect equipment from damage in the event of disturbances and minimize disruptions from spreading. With good protection system, the unwanted loss can be avoided, especially in the vital equipment such as generators and transformers. One of the equipment that plays a role in the protection system is a differential protection relays are used to protect generators and transformers. This relay protects the generator and transformer from internal disturbances such short circuit between phases or short circuit of phase to ground. This rele works based on the current setting and operating time has been determined so that it can work quickly and precisely targeted.
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Ali, Abdul-Jabbar, Wael Zayer, and Samhar Shukir. "Fuzzy Logic Controller Based DVR For Power Quality Improvement under Different Power Disturbances with Non-Linear Loads." Iraqi Journal for Electrical and Electronic Engineering 15, no. 2 (December 1, 2019): 50–60. http://dx.doi.org/10.37917/ijeee.15.2.6.
Повний текст джерелаАнотація:
The power quality problems can be defined as the difference between the quality of power supplied and the quality of power required. Recently a large interest has been focused on a power quality domain due to: disturbances caused by non-linear loads and Increase in number of electronic devices. Power quality measures the fitness of the electric power transmitted from generation to industrial, domestic and commercial consumers. At least 50% of power quality problems are of voltage quality type. Voltage sag is the serious power quality issues for the electric power industry and leads to the damage of sensitive equipments like, computers, programmable logic controller (PLC), adjustable speed drives (ADS). The prime goal of this paper is to investigate the performance of the Fuzzy Logic controller based DVR in reduction the power disturbances to restore the load voltage to the nominal value and reduce the THD to a permissible value which is 5% for the system less than 69Kv. The modeling and simulation of a power distribution system have been achieved using MATLABL/Simulink. Different faults conditions and power disturbances with linear and non-linear loads are created with the proposed system, which are initiated at a duration of 0.8 sec and kept till 0.95 sec.
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Tantawy, Elham M., Ebrahim A. Badran, and Mansour H. Abdel-Rahman. "Techno-Economic Assessment of Voltage Sags Mitigation in Distribution System Connected to DGs." International Transactions on Electrical Energy Systems 2022 (August 4, 2022): 1–15. http://dx.doi.org/10.1155/2022/8795100.
Повний текст джерелаАнотація:
The penetration of DG in electrical distribution systems has many benefits. The paper highlights the impact of DG penetration at different load centers and different operating conditions in a distribution feeder. The impact of DG penetration on feeder voltage profile that depends on the size and location of DG in the system is illustrated. Mitigating methods are used to reduce the effect of voltage disturbances. Economic assessment studies are used for assisting in the economic choice of mitigating methods. Economical aspects of distribution systems connected to DGs are considered through the analysis of the life cycle cost of these distribution generation sources. Maintenance strategies are illustrated and discussed to keep these sources always ready for operation regarding minimization of maintenance cost. Technical and economical assessments depend on the availability of historical data for disturbances cost including damages and cost of disturbance mitigation using different mitigation methods. These data are difficult to be available for different types of loads. Therefore, load indices, K1, K2, and K3, are proposed in this paper for the different loads as referring it to reference load has available data to overcome the challenge of data shortage. Also, a techno-economic assessment index F is proposed for the assessment of the impact of mitigating device improving cost and its feasibility. PSCAD/EMTDC simulation software package is used in this analysis. The results show that the proposed techno-economic assessment methodology facilitates the decision of choosing the mitigation method for power quality problems and to overcome the challenge of data shortage in the techno-economic assessment.
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Lui, A. T. Y. "Evaluation on the analogy between the dynamic magnetosphere and a forced and/or self-organized critical system." Nonlinear Processes in Geophysics 9, no. 5/6 (December 31, 2002): 399–407. http://dx.doi.org/10.5194/npg-9-399-2002.
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Abstract. The dissipation power and size of auroral blobs are investigated in detail to examine the possible analogy between the dynamic magnetosphere and a forced and/or self-organized critical system. The distributions of these auroral parameters are sorted in terms of different levels of activity, namely substorms, pseudo-breakups, and quiet conditions. A power law (scale-free) component is seen in all these distributions. In addition, a peak distribution is found for substorm intervals and a hump for pseudo-breakup intervals. The peak distribution is present prominently during magnetic storms, i.e. when the magnetosphere is strongly driven by the solar wind. It is interpreted that the scale-free component is associated with the activity of the diffuse aurora, corresponding to disturbances at all permissible scales within the plasma sheet. Ionospheric feedback appears to be essential for the presence of two components in the distribution for auroral dissipation power. These results are consistent with the concept that the magnetosphere is in a forced and/or self-organized critical state, although they do not constitute conclusive evidence for the analogy.
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Kunitomo, Naoto. "Approximate Distributions and Power of Test Statistics for Overidentifying Restrictions in a System of Simultaneous Equations." Econometric Theory 4, no. 2 (August 1988): 248–74. http://dx.doi.org/10.1017/s0266466600012056.
Повний текст джерелаАнотація:
We derive asymptotic expansions of the distributions of test statistics for over-identifying restrictions in a system of simultaneous equations under the null and the non-null hypotheses. We investigate the effects of the normality assumption for disturbances on the test statistics based on their asymptotic expansions. We also study the power functions of test statistics based on their asymptotic expansions. After modifying their critical regions to the same significance level, the power function of Basmann's statistic is larger than that of the likelihood ratio test when the variance of disturbances is sufficiently small. However, the difference in powers of the two test statistics disappears as the sample size grows larger.
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Zhong, Weilin, Junru Chen, Muyang Liu, Mohammed Ahsan Adib Murad, and Federico Milano. "Coordinated Control of Virtual Power Plants to Improve Power System Short-Term Dynamics." Energies 14, no. 4 (February 23, 2021): 1182. http://dx.doi.org/10.3390/en14041182.
Повний текст джерелаАнотація:
The paper proposes a coordinated frequency control strategy for Virtual Power Plant (VPPs), with the inclusion of Distributed Energy Resource (DERs), e.g., Solar Photo-Voltaic Generation (SPVG), Wind Generator (WG) as well as Energy Storage System (ESS). The objective is to improve the short-term dynamic response of the overall power system. The robustness of the proposed control is evaluated through a Monte Carlo analysis and a detailed modeling of stochastic disturbances of loads, wind speed, and solar irradiance. The impact of communication delays of a variety of realistic communication networks with different bandwidths is also discussed and evaluated. The case study is based on a modified version of the WSCC 9-bus test system with inclusion of a VPP. This is modeled as a distribution network with inclusion of a variety of DERs.
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Kanagaraj, N., and Hegazy Rezk. "Dynamic Voltage Restorer Integrated with Photovoltaic-Thermoelectric Generator for Voltage Disturbances Compensation and Energy Saving in Three-Phase System." Sustainability 13, no. 6 (March 22, 2021): 3511. http://dx.doi.org/10.3390/su13063511.
Повний текст джерелаАнотація:
The dynamic voltage restorer (DVR) combined with a photovoltaic–thermoelectric generator (PV-TEG) system is proposed for voltage disturbance compensation in the three-phase four-wire distribution system. The PV-TEG hybrid energy source is used in the DVR system to improve the system ability for deep and long-period power quality disturbance compensation. In addition, the DVR will save grid energy consumption when the hybrid PV-TEG module generates sufficient power to meet the load demand. An enhanced variable factor adaptive fuzzy logic controller (VFAFLC)-based maximum power point tracking (MPPT) control scheme is proposed to extract the maximum possible power from the PV module. Since the PV and TEG combine a hybrid energy source for generating power, the DVR can work efficiently for the voltage sag/swell, outage compensation, and energy conservation mode with minimum energy storage facilities. The in-phase compensation method and the three-leg voltage source inverter (VSI) circuit are chosen in the present system for better voltage and/or power compensation. To confirm the effectiveness of the proposed hybrid PV-TEG integrated DVR system, a simulation-based investigation is carried out with four different operational modes with MATLAB software. The study results confirm that the proposed DVR system can compensate power quality disturbances of the three-phase load with less total harmonics distortion (THD) and will also work efficiently under energy conservation mode to save grid energy consumption. Moreover, the proposed VFAFLC-based control technique performs better to achieve the maximum power point (MPP) quickly and accurately, thereby improving the efficiency of the hybrid energy module.
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Benali, Abdelkrim, Mounir Khiat, and Mouloud Denai. "Voltage profile and power quality improvement in photovoltaic farms integrated medium voltage grid using dynamic voltage restorer." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 3 (September 1, 2020): 1481. http://dx.doi.org/10.11591/ijpeds.v11.i3.pp1481-1490.
Повний текст джерелаАнотація:
<p class="Abstract">In this paper, we have presented a simulation study to analyze the power quality of three phases medium voltage grid connected with distribution generation (DG) such as photovoltaic (PV) farms and its control schemes. The system uses two-stage energy conversion topology composed of a DC to DC boost converter for the extraction of maximum power available from the solar PV system based on incremental inductance technique and a three-level voltage source inverter (VSI) to connect PV farm to the power grid. To maintain the grid voltage and frequency within tolerance following disturbances such as voltage swells and sags, a fuzzy logic-based Dynamic Voltage Restorer is proposed. The role of the DVR is to protect critical loads from disturbances coming from the network. Different fault conditions scenarios are tested and the results such as voltage stability, real and reactive powers, current and power factor at the point of common coupling (PCC) are compared with and without the DVR system.</p>
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Rojas-Cubides, Herbert Enrique, Audrey Soley Cruz-Bernal, and Harvey David Rojas-Cubides. "Analysis of voltage sag compensation in distribution systems using a multilevel DSTATCOM in ATP/EMTP." DYNA 82, no. 192 (August 25, 2015): 26–36. http://dx.doi.org/10.15446/dyna.v82n192.48566.
Повний текст джерелаАнотація:
<p class="Abstract"><span lang="EN-US">Voltage sags are the most common power quality disturbances in electrical facilities. It may cause malfunction in sensitive equipment and process interruption. The distribution static compensator (DSTATCOM) is a device that can compensate voltage sags by injecting reactive power into distribution system. This paper shows the influence on voltage sags characteristics by the presence of twelve-pulse DSTATCOM in the modified IEEE-13 distribution system. The analysis is performed by means of a random generation of disturbances using a MATLAB routine to identify the critical buses of the test system. Further, the DSTATCOM model taking advantage of the available elements from ATP/EMTP software is described. Simulations show that when DSTATCOM is placed directly to affected bus it is possible to obtain a complete mitigation of the voltage sag. Finally, the relation between the reactive power injected by DSTATCOM, the type of voltage sag and the location of affected bus is considered.</span></p>
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Shahani, Z. A., A. A. Hashmani, and M. M. Shaikh. "Steady State Stability Analysis and Improvement using Eigenvalues and PSS: A Case Study of a Thermal Power Plant in Jamshoro, Pakistan." Engineering, Technology & Applied Science Research 10, no. 1 (February 3, 2020): 5301–6. http://dx.doi.org/10.48084/etasr.3318.
Повний текст джерелаАнотація:
The efficient handling and distribution of electrical power consist one of the most complex and appealing research problems. Due to the interconnection of different power plants and intensity of load, which gradually changes due to continuous change in load on generating units, careful treatment of the small disturbances in a power system which may lead to severe disturbance is necessary. Stability is an essential part in electrical power system operation and control. The stability problem is related with the behavior of synchronous machine after the power system is subjected to trouble. This work presents Steady State Stability (SSS) analysis of a Jamshoro Thermal Power Plant (JTPP) by using eigenvalue analysis of the different cases by varying load at three different positions. A mathematical model has been used for the JTPP with real data in order to examine the behavior of the system and to find the eigenvalues. A Simulink model of the JTTP for waveform analysis in MATLAB/Simulink has been used without and with Power System Stabilizer (PSS). Numerical quantification of the eigenvalues under the examined cases categorizes the stability of the system. The waveforms of the system are analyzed, and in cases of instability, the proposed procedure utilizing PSS helps in maintaining the system’s usual working conditions. The eigenvalue analysis and simulation results show the behavior of synchronous machines when loading changes gradually. The existing system becomes stable after more swings, whereas by using PSS in the existing system, stable regimes are attained in less time. The obtained results demonstrate the effectiveness of the proposed solution for SSS examination and securing of the disturbances of the JTPP.
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Putra, Adi Pratama, and Adi Mulyadi. "Design an Automatic Transfer Switch for Solar Power Plant." Logic : Jurnal Rancang Bangun dan Teknologi 22, no. 1 (March 30, 2022): 9–12. http://dx.doi.org/10.31940/logic.v22i1.9-12.
Повний текст джерелаАнотація:
This paper discusses the automatic transfer switch (ATS) in solar power plants. ATS is used to transfer the main electrical power to a backup power source (battery). PLN power cannot supply electricity continuously due to non-standard ATS installations, blackouts, disturbances to the generating system, and distribution system. Two ATS systems are proposed to control the switching process of PLN and PLTS automatically using inverter standby mode (ISM) and inverter off mode (IOM). The results of the application of ISM to PLN and PLTS can supply power needs based on switching techniques to avoid equipment damage. While IOM can save battery for inverter power supply.