Journal articles: 'Low voltage power distribution'

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Fan, Yan Li, and Qing En Li. "Design of Low-Voltage Power Distribution System." Advanced Materials Research 791-793 (September 2013): 1889–91. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.1889.

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The low-voltage distribution system is the key component of the electrical power system. Some analysis and research of the low-voltage distribution system is carried out in this paper, which provides some scientific basis to design the low-voltage distribution system. Firstly, the summarize of low-voltage distribution system is taken. The influence to productions and livings of low-voltage distribution system is introduced. Secondly, the mode of connection and design philosophy of low-voltage distribution system is studied in detail, especially the high-rise buildings low-voltage distribution system is concluded and summarized.

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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.

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<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>

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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.

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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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Tian, Lei, Yuan Hong, Wen Yuan Li, and Qing Feng Zhang. "Research of Low Voltage Distribution Grid’s Reliability." Applied Mechanics and Materials 577 (July 2014): 572–75. http://dx.doi.org/10.4028/www.scientific.net/amm.577.572.

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Management of power supply reliability is not only the quality management of equipment and power supply system, but also the safety management of equipment’s operation and power supply system’s maintenance. In order to analysis the reliability of 10kV distribution grid, on the one hand, this paper analyzed the structure characteristics of 10kV distribution grid and four kinds of wiring patterns, which were the main parts of 10kV distribution grid. On the other hand, it pointed out the reasons, which affected the distribution grid’s reliability and discussed the ways to improve the 10kV distribution grid’s reliability.

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Volosciuc, Sorin Dan, and Monica Elena Dragosin. "Prosumer’s impact on low voltage distribution networks." MATEC Web of Conferences 290 (2019): 01021. http://dx.doi.org/10.1051/matecconf/201929001021.

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The use of renewable energy, within nowadays energy policy, has increased considerably all over the world in order to respond to the increasing energy consumption and to reduce the environmental impact of the electricity generation. At the beginning, the relatively low penetration levels of distributed generation does not produce problems, however, the nowadays massive increase of local power generation have led to new integration challenges in order to ensure the reliability and quality of the power supply. This paper also highlights some aspects regarding the use of the active distribution networks of low voltage to which electric energy producers are connected-the prosumers: advantages and disadvantages for the consumer and for the supplier, technical requirements for connection, identification of the problems of power quality.

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De Falco, Pasquale, and Pietro Varilone. "Statistical Characterization of Supraharmonics in Low-Voltage Distribution Networks." Applied Sciences 11, no. 8 (April 16, 2021): 3574. http://dx.doi.org/10.3390/app11083574.

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Modern power systems are subject to waveform distortions that include spectral components (supraharmonics) in the range of 2–150 kHz. Due to the lack of regulation in this range and since supraharmonics may follow time-varying patterns, the operators can take advantage of the statistical characterization of supraharmonics, e.g., for determining convenient power quality limits or to analyze the residual capacity of networks toward further installations of power electronic converters. This paper studies the statistical characterization of supraharmonics in low-voltage distribution networks, considering both the overall supraharmonic distortion (through the characterization of the total supraharmonic distortion index) and individual supraharmonic components. Several probability distributions are proposed and compared, also considering multimodal distributions that can fit more general scenarios in which the supraharmonic emissions follow regime patterns. The outcome of numerical experiments based on publicly available data collected at actual low-voltage distribution networks suggests that multimodal distributions are useful in characterizing supraharmonics in most cases, with acceptable goodness of fitting even in the presence of stair-shaped empirical distributions. This paper can serve as a starting point for the development of probabilistic power system analysis tools accounting for supraharmonic emissions and for the convergence toward standardization in the 2–150 kHz range.

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Prof. Amruta Bijwar, Prof. Madhuri Zambre. "Voltage Protection and Harmonics Cancellation in Low Voltage Distribution Network." International Journal of New Practices in Management and Engineering 7, no. 04 (December 31, 2018): 01–07. http://dx.doi.org/10.17762/ijnpme.v7i04.68.

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Nowadays low voltage distribution network is considered as worldwide future generation distribution network. But the major concern is harmonics generation and steps taken to cancel those harmonics. In our proposed work, low voltage distribution network is designed with low voltage and harmonics are cancelled in our method. The combination of current control unit and voltage control unit will give extra reliable power solution to increase the required capacity of low voltage grids. The high voltage protection gears are used in worst environment for low voltage and low current distribution network test is preferable to assess a variety of operation uniqueness. Therefore, it has few restrictions in implementation of economic in addition to process methodologies. In our work a 48V direct current base up-scale low voltage distribution network test is urbanized to allow the copy and surveillance of a variety of phenomenon of direct current distribution networks. The proposed system provide stretchy pattern ability by introduce S-connectors and T-connectors module that will be proscribed distantly, and near real time monitor function through by means of a data acquisition system associated toward the nodes. Each connector be able to calculate Power, Voltage and current with up to 250 kHz frequency. To calculate power quality and to understand the performance of the distribution network, frequency analysis is required along with collected data.

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Pullaguram, Deepak, Sukumar Mishra, and Nilanjan Senroy. "Coordinated single-phase control scheme for voltage unbalance reduction in low voltage network." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, no. 2100 (July 10, 2017): 20160308. http://dx.doi.org/10.1098/rsta.2016.0308.

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Low voltage (LV) distribution systems are typically unbalanced in nature due to unbalanced loading and unsymmetrical line configuration. This situation is further aggravated by single-phase power injections. A coordinated control scheme is proposed for single-phase sources, to reduce voltage unbalance. A consensus-based coordination is achieved using a multi-agent system, where each agent estimates the averaged global voltage and current magnitudes of individual phases in the LV network. These estimated values are used to modify the reference power of individual single-phase sources, to ensure system-wide balanced voltages and proper power sharing among sources connected to the same phase. Further, the high X / R ratio of the filter, used in the inverter of the single-phase source, enables control of reactive power, to minimize voltage unbalance locally. The proposed scheme is validated by simulating a LV distribution network with multiple single-phase sources subjected to various perturbations. This article is part of the themed issue ‘Energy management: flexibility, risk and optimization’.

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Ogunboyo, Patrick Taiwo, Remy Tiako, and Innocent E. Davidson. "Investigation of Voltage Unbalance Profile in Low Voltage Electrical Distribution Network with Normal Mode Operation Using MATLAB." International Journal of Engineering Research in Africa 35 (March 2018): 60–76. http://dx.doi.org/10.4028/www.scientific.net/jera.35.60.

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With ever increasing use of semiconductor devices and information technology (ICT) equipment in the industry, homes and offices, power quality is gaining attention to both industry and the electric utility. Power voltage quality cause huge economic losses to businesses all over the world. It is estimated to cost industry and commerce about €100 billion per annum in European Union, since voltage quality problem is one of the major power quality disturbances. This paper presents an investigative a study of the 11/0.4 kV, low voltage electrical distribution network and analyzes voltage unbalance. It recommends an effective method of improving the voltage profile and reducing the voltage unbalance to acceptable standard. The network was modelled using distribution network standard parameters for low voltage distribution network using MATLAB/Simulink sim power system tool box. The simulation results show that the percentage voltage unbalance, correct voltage profile and minimum voltage drop of 0.5 km distribution feeder line is of standard acceptable statutory limit, hence the distribution line operates at optimum performance. However, it is also established that the voltage profile for distribution network feeder lengths of 0.8 km to 5 km for balanced and unbalanced distribution lines from the beginning to the customer terminal of the distribution lengths are less than the acceptable allowable limit of – 5 %, of the nominal voltage value, hence voltages are inadmissible for customers use. Moreso, the percentage voltage unbalance, voltage profile and voltage drop on 0.8 km to 5 km distribution feeder line are all less than standard acceptable statutory limit, hence the distribution line operates below optimum performance. It was established that mitigating these problems require the electricity distribution company to install an effective voltage boosting devices along the network lengths in order provide admissible, permissible and normalize end users standard acceptable voltage.

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Carrión, Miguel, Rafael Zárate-Miñano, and Ruth Domínguez. "Integration of Electric Vehicles in Low-Voltage Distribution Networks Considering Voltage Management." Energies 13, no. 16 (August 10, 2020): 4125. http://dx.doi.org/10.3390/en13164125.

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The expected growth of the number of electric vehicles can be challenging for planning and operating power systems. In this sense, distribution networks are considered the Achilles’ heel of the process of adapting current power systems for a high presence of electric vehicles. This paper aims at deciding the maximum number of three-phase high-power charging points that can be installed in a low-voltage residential distribution grid. In order to increase the number of installed charging points, a mixed-integer formulation is proposed to model the provision of decentralized voltage support by electric vehicle chargers. This formulation is afterwards integrated into a modified AC optimal power flow formulation to characterize the steady-state operation of the distribution network during a given planning horizon. The performance of the proposed formulations have been tested in a case study based on the distribution network of La Graciosa island in Spain.

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Sun, Mei. "Study of Intelligent Monitoring System of Low-Voltage Power Distribution." Applied Mechanics and Materials 416-417 (September 2013): 781–84. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.781.

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With the development of domestic low-voltage power distribution technology, people have an increasingly higher demand on the intelligence of low-voltage power distribution cabinet. Combined with the authors several years of experience of practice, this thesis first of all makes a brief analysis of the general situation of power distribution system automation, followed by a key analysis and conclusion of the characteristics of the existing low-voltage monitoring mode. Based on it, digital signal processor with strong floating point calculation ability, a new low-voltage intelligent monitoring system is designed.

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Hock, Rubens Tadeu, Yales Romulo de Novaes, and Alessandro Luiz Batschauer. "A Voltage Regulator for Power Quality Improvement in Low-Voltage Distribution Grids." IEEE Transactions on Power Electronics 33, no. 3 (March 2018): 2050–60. http://dx.doi.org/10.1109/tpel.2017.2693239.

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Zimann, Felipe J., Eduardo V. Stangler, Francisco A. S. Neves, Alessandro L. Batschauer, and Marcello Mezaroba. "Coordinated Control of Active and Reactive Power Compensation for Voltage Regulation with Enhanced Disturbance Rejection Using Repetitive Vector-Control." Energies 13, no. 11 (June 2, 2020): 2812. http://dx.doi.org/10.3390/en13112812.

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Voltage profile is one of many aspects that affect power quality in low-voltage distribution feeders. Weak grids have a typically high line impedance which results in remarkable voltage drops. Distribution grids generally have a high R/X ratio, which makes voltage regulation with reactive power compensation less effective than in high-voltage grids. Moreover, these networks are more susceptible to unbalance and harmonic voltage disturbances. This paper proposes an enhanced coordinated control of active and reactive power injected in a distribution grid for voltage regulation. Voltage drop mitigation was evaluated with power injection based on local features, such loads and disturbances of each connection. In order to ensure disturbances rejection like harmonic components in the grid voltages, a repetitive vector-control scheme was used. The injection of coordinated active and reactive power with the proposed control algorithm was verified through simulations and experiments, demonstrating that it is a promising alternative for voltage regulation in weak and low-voltage networks subject to inherent harmonic distortion.

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Ghaffarianfar, Majid, and Amin Hajizadeh. "Voltage Stability of Low-Voltage Distribution Grid with High Penetration of Photovoltaic Power Units." Energies 11, no. 8 (July 27, 2018): 1960. http://dx.doi.org/10.3390/en11081960.

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Voltage stability analysis of power distribution systems with high photovoltaic (PV) penetration is a challenging problem due to the stochastic generation of a solar power system. Voltage stability is an important benchmark for defining PV’s penetration level in active distribution networks considering loading capacity. The massive integration of PV power units, the effect of distribution system characteristics, like high ratio of R/X, and the reported collapses in power networks come up in serious studies that investigate their impact and upcoming problems on distribution networks. Therefore, this paper proposes analytical voltage stability and it is implemented on IEEE 34 nodes radial distribution systems with 24.9 kV and 4.16 kV voltage levels. In this regard, in addition to given properties in stability and power loss analysis, a penetration coefficient for PVs is considered. Simulation results prove that the applied method can illustrate the positive and negative effects of PV in distribution networks.

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Aliyari, Mostafa, Yonas Z. Ayele, Abbas Barabadi, and Enrique Lopez Droguett. "Risk analysis in low-voltage distribution systems." Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability 233, no. 2 (March 6, 2018): 118–38. http://dx.doi.org/10.1177/1748006x18759806.

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Electric power distribution is a complex network involving technical challenges from a wide range of sources, a considerable degree of risk and substantial financial resources. Design and maintenance strategies must take account of the risk of failure of distribution components, that is, both the probability of failure and its consequences have to be considered. Historical failure and repair data are essential inputs for risk analysis, since they reflect the actual operational conditions that the system and its components have experienced. Failure and repair data analysis generally aims at decreasing the risk of failure, by providing essential information for maintenance and logistic planning to reduce the probability, as well as the consequence, of failure. Hence, when maintaining and designing distribution networks, it is imperative to identify and quantify all risks – direct financial, health, safety and environmental, and reputation – using the field failure and repair data. However, in the majority of the available literature regarding the failure and repair data analysis of distribution networks, especially the low-voltage distribution, the set of risk analysis principles is not integrated or in some cases is not detailed. The purpose of this article is to propose a methodology for identifying a suitable failure analysis tool for low-voltage distribution by integrating a set of risk analysis principles, as well as the reliability and maintainability estimation. The application of the proposed methodology is demonstrated by a real case study via an evaluation of the power outages data.

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Moses, Agbesi K., Sayawu Yakubu Diaba, Emmanuel A. Frimpong, Emmanuel K. Anto, and Mohammed S. Elmustrati. "Impact of Photovoltaic System Integration on Low Voltage Network." International Journal of Emerging Technology and Advanced Engineering 10, no. 10 (October 25, 2020): 90–95. http://dx.doi.org/10.46338/ijetae1020_16.

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In this paper, we perform an analysis of the Photovoltaic penetrations on Low Voltage Power Distribution Networks. A case study of the East Legon Power Distribution Services M05/52 LV Network. The impacts of high photovoltaic penetration on voltage level and power factors are explored. We fixed power quality analyzers at the distribution substation and at the customers’ nodes; to capture the feeder loads and the voltage profiles. Simulations are done at varying photovoltaic penetrations levels to determine the strike of increasing photovoltaic incursion on the low voltage power network. We present results to show that, the optimum penetration level is achieved at the point where minimum loss reduction is recorded, reverse flow not present and power factor limit is not violated.

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Su, Shiwei, Yiran You, and Yu Zou. "COMPREHENSIVE METHOD FOR EVALUATION OF MEDIUM- AND LOW-VOLTAGE DISTRIBUTION NETWORK OPERATING STATE." Tekhnichna Elektrodynamika 2020, no. 6 (October 21, 2020): 47–56. http://dx.doi.org/10.15407/techned2020.06.047.

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With the development of intelligent distribution networks and access to distributed energy, the solving the problem of timely and accurate determination of the operating state of the distribution network is an urgent task. Based on an improved analysis of the principle components of the network and statements of a self-organizing neural network, this article proposes the method to evaluate the operating state of medium- and low-voltage distribution networks. At the first step, the system of evaluating indices of the network is formed by advanced component analysis. The evaluation system is grounded on four aspects, including safety, reliability, quality and economy. Next, the self-organizing neural network is used to identify and clean up the data regarding the operating state of the distribution network. At the next step, the indicators are modeled at all levels; the entropy method is applied to calculate the total weight of all indicators. Then the value of each indicator is found and the weak links of the distribution network are determined. At the final stage, the comprehensive assessment of the real operation of the distribution network in Guangxi province is carried out. As shown, the method can effectively reduce the effect of abnormal data and subjectivity factor on the results of evaluating the state of the distribution network. That confirms the feasibility and practicability of the proposed method. References 22, figures 6, tables 6.

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Matsuda, Katsuhiro, Kazuhiro Horikoshi, Toshiyuki Seto, Osamu Iyama, and Hiromu Kobayashi. "Development of Automatic Voltage Regulator for Low-Voltage Distribution Systems." Electrical Engineering in Japan 188, no. 4 (June 10, 2014): 9–19. http://dx.doi.org/10.1002/eej.22438.

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Iioka, Daisuke, Takahiro Fujii, Toshio Tanaka, Tsuyoshi Harimoto, and Junpei Motoyama. "Voltage Reduction in Medium Voltage Distribution Systems Using Constant Power Factor Control of PV PCS." Energies 13, no. 20 (October 17, 2020): 5430. http://dx.doi.org/10.3390/en13205430.

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Reverse power flow from a photovoltaic (PV) system in a distribution system causes a voltage rise. A relative study regarding the reduction in the distribution feeder voltage depending on system conditions and the magnitude of reverse power flow has been conducted. Several methods for mitigating voltage rise have been proposed; however, the influence of these methods on the voltage in the distribution system, where the voltage is reduced due to reverse power flow, remains to be determined. In this study, the effect of constant power factor control in low-voltage PV systems, which are widely used as voltage rise countermeasures in distribution systems, was analyzed under the condition that the distribution line voltage decreases due to reverse power flow. Consequently, the constant power factor control of the low-voltage distribution system was found to adversely reduce voltage in the medium voltage distribution system due to the consumption of lagging reactive power by the PV systems.

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Park, Jingyeong, Daisuke Kodaira, Kofi Afrifa Agyeman, Taeyoung Jyung, and Sekyung Han. "Adaptive Power Flow Prediction Based on Machine Learning." Energies 14, no. 13 (June 25, 2021): 3842. http://dx.doi.org/10.3390/en14133842.

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Power flow analysis is an inevitable methodology in the planning and operation of the power grid. It has been performed for the transmission system, however, along with the penetration of the distributed energy resources, the target has been expanded to the distribution system as well. However, it is not easy to apply the conventional method to the distribution system since the essential information for the power flow analysis, say the impedance and the topology, are not available for the distribution system. To this end, this paper proposes an alternative method based on practically available parameters at the terminal nodes without the precedent information. Since the available information is different between high-voltage and low-voltage systems, we develop two various machine learning schemes. Specifically, the high-voltage model incorporates the slack node voltage, which can be practically obtained at the substation, and yields a time-invariant model. On the other hand, the low voltage model utilizes the deviation of voltages at each node for the power changes, subsequently resulting in a time-varying model. The performance of the suggested models is also verified using numerical simulations. The results are analyzed and compared with another power flow scheme for the distribution system that the authors suggested beforehand.

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Mohammad, Khader, Ayman Dodin, Bao Liu, and Sos Agaian. "Reduced Voltage Scaling in Clock Distribution Networks." VLSI Design 2009 (March 21, 2009): 1–7. http://dx.doi.org/10.1155/2009/679853.

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We propose a novel circuit technique to generate a reduced voltage swing (RVS) signals for active power reduction on main buses and clocks. This is achieved without performance degradation, without extra power supply requirement, and with minimum area overhead. The technique stops the discharge path on the net that is swinging low at a certain voltage value. It reduces active power on the target net by as much as 33% compared to traditional full swing signaling. The logic 0 voltage value is programmable through control bits. If desired, the reduced-swing mode can also be disabled. The approach assumes that the logic 0 voltage value is always less than the threshold voltage of the nMOS receivers, which eliminate the need of the low to high voltage translation. The reduced noise margin and the increased leakage on the receiver transistors using this approach have been addressed through the selective usage of multithreshold voltage (MTV) devices and the programmability of the low voltage value.

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Hlad, Ivan Vasylovych, and Yaroslav Vasylovych Batsala. "INFLUENCE OF SOLAR POWER PLANTS ON LOW-VOLTAGE DISTRIBUTION NETWORKS." POWER ENGINEERING: economics, technique, ecology, no. 3 (December 27, 2017): 119–23. http://dx.doi.org/10.20535/1813-5420.3.2017.117378.

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SIKORSKI, Tomasz. "Power Quality in Low-Voltage Distribution Network with Distributed Generation." PRZEGLĄD ELEKTROTECHNICZNY 1, no. 6 (June 5, 2015): 34–41. http://dx.doi.org/10.15199/48.2015.06.05.

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Nainar, Karthikeyan, Catalin Iosif Ciontea, Kamal Shahid, Florin Iov, Rasmus Løvenstein Olsen, Christine Schäler, and Hans-Peter Christian Schwefel. "Experimental Validation and Deployment of Observability Applications for Monitoring of Low-Voltage Distribution Grids." Sensors 21, no. 17 (August 27, 2021): 5770. http://dx.doi.org/10.3390/s21175770.

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Future distribution grids will be subjected to fluctuations in voltages and power flows due to the presence of renewable sources with intermittent power generation. The advanced smart metering infrastructure (AMI) enables the distribution system operators (DSOs) to measure and analyze electrical quantities such as voltages, currents and power at each customer connection point. Various smart grid applications can make use of the AMI data either in offline or close to real-time mode to assess the grid voltage conditions and estimate losses in the lines/cables. The outputs of these applications can enable DSOs to take corrective action and make a proper plan for grid upgrades. In this paper, the process of development and deployment of applications for improving the observability of distributions grids is described, which consists of the novel deployment framework that encompasses the proposition of data collection, communication to the servers, data storage, and data visualization. This paper discussed the development of two observability applications for grid monitoring and loss calculation, their validation in a laboratory setup, and their field deployment. A representative distribution grid in Denmark is chosen for the study using an OPAL-RT real-time simulator. The results of the experimental studies show that the proposed applications have high accuracy in estimating grid voltage magnitudes and active energy losses. Further, the field deployment of the applications prove that DSOs can gain insightful information about their grids and use them for planning purposes.

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Michishita, Koji. "Lightning Overvoltage on Low-Voltage Distribution System." IEEJ Transactions on Power and Energy 131, no. 6 (2011): 481–84. http://dx.doi.org/10.1541/ieejpes.131.481.

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Fernández, Gregorio, Noemi Galan, Daniel Marquina, Diego Martínez, Alberto Sanchez, Pablo López, Hans Bludszuweit, and Jorge Rueda. "Photovoltaic Generation Impact Analysis in Low Voltage Distribution Grids." Energies 13, no. 17 (August 22, 2020): 4347. http://dx.doi.org/10.3390/en13174347.

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Due to a greater social and environmental awareness of citizens, advantageous regulations and a favourable economic return on investment, the presence of photovoltaic (PV) installations in distribution grids is increasing. In the future, not only a significant increase in photovoltaic generation is expected, but also in other of the so-called distributed energy resources (DER), such as wind generation, storage, electric vehicle charging points or manageable demands. Despite the benefits posed by these technologies, an uncontrolled spread could create important challenges for the power system, such as increase of energy losses or voltages out-of-limits along the grid, for example. These issues are expected to be more pronounced in low voltage (LV) distribution networks. This article has two main objectives: proposing a method to calculate the LV distributed photovoltaic generation hosting capacity (HC) that minimizes system losses and evaluating different management techniques for solar PV inverters and their effect on the hosting capacity. The HC calculation is based on a mixture of deterministic methods using time series data and statistical ones: using real smart meters data from customers and generating different combinations of solar PV facilities placements and power to evaluate its effect on the grid operation.

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Barros, Julio, Matilde de Apráiz, and Ramón Diego. "Power Quality in DC Distribution Networks." Energies 12, no. 5 (March 5, 2019): 848. http://dx.doi.org/10.3390/en12050848.

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This paper presents an overview of power quality in low-voltage DC distribution networks. We study which of the power quality disturbances in AC networks are also relevant in DC networks, as well as other disturbances specific to DC networks. The paper reviews the current status of international regulations in this topic and proposes different indices for the detection and characterization of the main types of power quality disturbances, presenting some results obtained in different laboratory tests in DC networks using different DC voltage shapes delivered by different DC power source types.

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Andreou, Georgios T., and Dimitris P. Labridis. "Electrical Parameters of Low-Voltage Power Distribution Cables Used for Power-Line Communications." IEEE Transactions on Power Delivery 22, no. 2 (April 2007): 879–86. http://dx.doi.org/10.1109/tpwrd.2006.881577.

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Mieński, Rozmysław, Przemysław Urbanek, and Irena Wasiak. "Using Energy Storage Inverters of Prosumer Installations for Voltage Control in Low-Voltage Distribution Networks." Energies 14, no. 4 (February 20, 2021): 1121. http://dx.doi.org/10.3390/en14041121.

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The paper includes the analysis of the operation of low-voltage prosumer installation consisting of receivers and electricity sources and equipped with a 3-phase energy storage system. The aim of the storage application is the management of active power within the installation to decrease the total power exchanged with the supplying network and thus reduce energy costs borne by the prosumer. A solution for the effective implementation of the storage system is presented. Apart from the active power management performed according to the prosumer’s needs, the storage inverter provides the ancillary service of voltage regulation in the network according to the requirements of the network operator. A control strategy involving algorithms for voltage regulation without prejudice to the prosumer’s interest is described in the paper. Reactive power is used first as a control signal and if the required voltage effect cannot be reached, then the active power in the controlled phase is additionally changed and the Energy Storage System (ESS) loading is redistributed in phases in such a way that the total active power set by the prosumer program remains unchanged. The efficiency of the control strategy was tested by means of a simulation model in the PSCAD/EMTDC program. The results of the simulations are presented.

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Mazumder, Sumit, Arindam Ghosh, and Firuz Zare. "Improving Power Quality in Low-Voltage Networks Containing Distributed Energy Resources." International Journal of Emerging Electric Power Systems 14, no. 1 (May 30, 2013): 67–78. http://dx.doi.org/10.1515/ijeeps-2013-0022.

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Abstract Severe power quality problems can arise when a large number of single-phase distributed energy resources (DERs) are connected to a low-voltage power distribution system. Due to the random location and size of DERs, it may so happen that a particular phase generates excess power than its load demand. In such an event, the excess power will be fed back to the distribution substation and will eventually find its way to the transmission network, causing undesirable voltage–current unbalance. As a solution to this problem, the article proposes the use of a distribution static compensator (DSTATCOM), which regulates voltage at the point of common coupling (PCC), thereby ensuring balanced current flow from and to the distribution substation. Additionally, this device can also support the distribution network in the absence of the utility connection, making the distribution system work as a microgrid. The proposals are validated through extensive digital computer simulation studies using PSCADTM.

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Vilela Junior, Wagner A., Antonio P. Coimbra, Gabriel A. Wainer, Joao Caetano Neto, Jose A. G. Cararo, Marcio R. C. Reis, Paulo V. Santos, and Wesley P. Calixto. "Analysis and Adequacy Methodology for Voltage Violations in Distribution Power Grid." Energies 14, no. 14 (July 20, 2021): 4373. http://dx.doi.org/10.3390/en14144373.

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This paper proposes a computational process development capable of filling the electric power sector shortage regarding voltage non-conformities identification in electric distribution power grid accounting for loads dynamic behavior at medium and low voltages. Actual distribution power grid data are used, with georeferencing to signal voltage transgressions locations, generate a report with voltage transgression indices and financial reimbursement values provided by legislation. The methodology compares regulatory requirements and makes available in software some possible actions in an attempt to adjust voltage levels, avoiding inconvenience and penalties for energy utilities providers. The method involves a data extractor construction for electricity provider company’s databases, computer simulations and comparison of obtained results with values established in electricity quality control standards. Thus, finding non-conformity locations and determining network adjustments to correct tension indexes in permanent regulation. The proposal features a reduction in electricity utilities operating costs, increasing efficiency in operation and energy quality available to consumers.

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Zeyuan, Shen, Song Wei, Zhao Haibo, Li Chunhui, Shen Zebo, Hu Ende, Xing Yahong, Wang Miao, and Gao Wei. "Research on the Influence of Distributed Generation on Voltage in Rural Distribution Network." E3S Web of Conferences 233 (2021): 01017. http://dx.doi.org/10.1051/e3sconf/202123301017.

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With the development of photovoltaic projects for poverty alleviation, large number of distributed photovoltaic power plant is incorporated rural grid. On the one hand, photovoltaic poverty project can increase the income of farmers, on the other hand, it can improve the low voltage problem of rural distribution network. While photovoltaic power plant incorporating makes the distribution network from traditional radial network become active network, and causes a change of voltage distribution in feeder. Rural grid distribution network is the weakest link in the entire grid. So that it is necessary to analyse the influence factors of voltage distribution and the interconnection principles of photovoltaic power station. In this paper, through the modeling and simulation of distributed photovoltaic access to rural distribution network, analyses the law of the capacity and access location of photovoltaic power integration in the distribution network, and summarizes the interconnection requirements of the photovoltaic power station. The results show that only reasonable and proper use the distributed photovoltaic power plant, can play the role of voltage support and solve the problem of low voltage in rural distribution network.

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33

Yang, Shi Wang, Peng Li, Chang Wang, and Jia Ming Li. "Decoupling Droop Control Method for Power Distribution of Microgrid." Advanced Materials Research 732-733 (August 2013): 1354–57. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.1354.

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How to ensure the security, stability and economic operation of microgrid in different operation modes is a difficult problem of microgrid research. There is active power and reactive power coupling in the regulation of frequencies and voltages because of the line parameter characteristics of microgrid. The defect of the traditional active power-frequency, reactive power-voltage droop control is analyzed and a novel decoupling droop control method for low voltage microgrid is proposed in this paper. At last, the multiple feedback loop control strategy for inverters on the basis of this proposed method and a microgrid simulation model are established. The comparative analysis between the new method and the traditional method based on the simulation results can prove that the proposed control method is simple in design, and it can assure an excellent power quality and realize the reasonable distribution of active power and reactive power between distributed generations.

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34

Naumov, Igor, Sergey Podyachikh, Dmitri Ivanov, Alexander Tretyakov, and Andrey Bastron. "Analysis of unbalanced load low-voltage electrical networks operating modes." E3S Web of Conferences 295 (2021): 02005. http://dx.doi.org/10.1051/e3sconf/202129502005.

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The article discusses distribution electrical networks 0.38 kV operating modes, feeding individual residential buildings. The electrical energy parameters measurement were certified RESURS-UF2M device carried out. The currents and voltages time diagrams based on the measurements made and using Matlab technologies were constructed. It is established that the level of phase currents unbalance is quite high and causes significant three-phase power supply system unbalance voltage accordingly. The power of quality indicators - calculations, characterizing voltage unbalance were made, which were based on the measurements and the computer program “Asymmetry” was used. As well as the additional power losses coefficient determining by the phase currents unbalance, were calculations. Time diagrams these indicators are constructed and their analysis were made. As a result, the power of quality is significantly reduced by unbalance power consumption in the studied electrical network were founded. At the same time, the additional power losses are significant increases. Specific recommendations for the normalization electrical network-operating mode are given.

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35

Yang, Xing Wu, Xin Hua Xiong, Wu Ouyang, and Shuai Yuan. "A New Power Electronic Transformer Applied to Distribution System." Applied Mechanics and Materials 448-453 (October 2013): 2879–85. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.2879.

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This paper proposes a new power electronic transformer (PET) to be used for distribution system, which is composed of the three-stage power circuits. The input stage uses Modular Multilevel Converter (MMC) to reduce the voltage stress rating of components, meanwhile, the harmonic components in the current will be deduced significantly, to make DC capacitor voltage of MMC rectifier balance, a control method is proposed. The isolation stage use a middle-frequency transformer to realize voltage conversion and isolation of the low-voltage side from the high-voltage side. In the third-stage, a inverter outputs the desired voltage and power to the load. The simulation results are presented to show the validity of the proposed PET system.

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36

Kim, Young-Sung, and Jae-Chul Kim. "Characteristic Impedances in Low-Voltage Distribution Systems for Power Line Communication." Journal of Electrical Engineering and Technology 2, no. 1 (March 1, 2007): 29–34. http://dx.doi.org/10.5370/jeet.2007.2.1.029.

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37

Qingren, Jin, Zhou Ke, Guo Mei, and Zhou Yangjun. "Research on restraining low voltage of distribution power network using STATCOM." IOP Conference Series: Earth and Environmental Science 431 (February 25, 2020): 012014. http://dx.doi.org/10.1088/1755-1315/431/1/012014.

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38

Pavlovic, Z., I. Manic, Z. Priji, and N. Stojadinovic. "Temperature distribution in the cells of low-voltage power VDMOS transistor." Microelectronics Journal 30, no. 2 (February 1999): 109–13. http://dx.doi.org/10.1016/s0026-2692(98)00096-2.

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39

Newton, Claire, Peter Lang, and Simon Terry. "Field trial results of power electronics in low-voltage distribution networks." CIRED - Open Access Proceedings Journal 2017, no. 1 (October 1, 2017): 184–88. http://dx.doi.org/10.1049/oap-cired.2017.0110.

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Shireen, Wajiha, and Li Tao. "A DSP-based active power filter for low voltage distribution systems." Electric Power Systems Research 78, no. 9 (September 2008): 1561–67. http://dx.doi.org/10.1016/j.epsr.2008.01.015.

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41

Torres, Daniela A., Anthony Kopa, Sara C. Barron, Robert McCormick, Robert D. White, and Caprice Gray. "Characterization of Low-Inductance Microcoaxial Cables for Power Distribution." Journal of Microelectronics and Electronic Packaging 15, no. 4 (October 1, 2018): 171–78. http://dx.doi.org/10.4071/imaps.729301.

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Abstract Low-impedance microcoaxial cables have been developed to supply power to microchips. These uniquely low-inductance cables are enabled by a very thin dielectric compared with a conventional 50-Ω cable. These cables will be used in a novel packaging platform in which traditional interconnects are replaced by microscale coaxial cables. This method saves time and cost for small production volumes and custom electronics, compared with high density interconnects and silicon interposer technologies. These microcoaxial cables are designed to have minimal impedance to meet the stringent power supply requirements of today's electronics. As a concrete example, we consider a Kintex 7 Field-Programmable Gate Array (FPGA). To power this chip with interconnect lengths of 25 mm and a voltage ripple less than 30 mV, a resistance of 3.20–6.40 mΩ/mm and an inductance of 12–15 pH/mm is needed. The tight voltage ripple constraint is what makes this device challenging to design power distribution for. One cable fabricated by Draper, to achieve these power requirements, is the focus of this article. The Draper cable consists of a 127-μm Copper core, 12-μm polyesterimide dielectric layer, and 55-μm gold shield. The measured resistance per unit length at DC, inductance per unit length, capacitance per unit length, and characteristic impedance of the Draper cable are 2.0 mΩ/mm, 40 pH/mm, 118 pF/mm, and 6.56 Ω, respectively.

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42

Psomopoulos, Constantinos S., George Ch Ioannidis, and Yannis Karras. "Role of low-voltage/NH fuselinks rated voltage in distribution network losses. An evaluation based on the Hellenic low-voltage distribution network." IET Generation, Transmission & Distribution 8, no. 5 (May 1, 2014): 803–10. http://dx.doi.org/10.1049/iet-gtd.2013.0520.

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Ji, Shi Qi, Xiao Jie Shi, Zhe Yu Zhang, Wen Chao Cao, and Fred Wang. "Benefits of High Voltage SiC Applications in Medium Voltage Power Distribution Grids." Materials Science Forum 924 (June 2018): 875–78. http://dx.doi.org/10.4028/www.scientific.net/msf.924.875.

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This paper evaluates potential benefits of high voltage (HV) SiC devices in medium voltage (MV) distribution grids. The MV microgrid, that HV SiC devices can benefit most, is selected as the “killer application” and focused in this paper. The design and simulation are carried out to compare Si-and SiC-based grid interface converters for the quantitative benefit assessment both at converter level and system level. The SiC-based converter has significant benefits in weight and size, and shows enhanced performance and functionality on power quality, system stability and low voltage ride through (LVRT) as well.

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44

Li, Jun, Lin Zhang, Mei Juan Liu, Ge Xin Xing, Wei Wei Li, Yi Qiang Zhao, Xin Xin Gu, and Xiao Hua Zhao. "The Design and Application of SVG for Low Voltage Distribution Networks." Applied Mechanics and Materials 448-453 (October 2013): 2097–104. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.2097.

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SVG can compensate reactive power deficiency, suppress harmonics, improve three-phase imbalance and power quality more flexibly. There are very few small volume SVG products available for low voltage distribution network in the past. The generic SVG products are very expansive, thus not suitable for low voltage distribution network. Therefore, it is an urgent task to design a new generation distribution network SVG product that offers good value for money. This paper studied a SVG digital controller based on TMS320F28335 DSP chip. The fast and powerful computing and parallel operation capability of TMS320F28335 can satisfy the real-time, multifunction and multiple objective coordination control of SVG. Applied the instantaneous reactive power theory and adopted current direct control mode, an enhanced filtering algorithm to filter instantaneous sampling value is proposed. Automatic bi-directional compensation control strategy effectively reduced voltage variation at the user side. Its effectiveness is verified by an engineering project.

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45

Asakawa, Akira. "Lightning Protection Design for Low Voltage Distribution Systems." IEEJ Transactions on Power and Energy 133, no. 7 (2013): 575–78. http://dx.doi.org/10.1541/ieejpes.133.575.

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46

Mendoza, Jorge E., Miguel E. López, Sebastián C. Fingerhuth, Héctor E. Peña, and Claudio A. Salinas. "Low voltage distribution planning considering micro distributed generation." Electric Power Systems Research 103 (October 2013): 233–40. http://dx.doi.org/10.1016/j.epsr.2013.05.020.

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Luo, Yanyu, Minyou Chen, Wenfa Kang, and Xiaoluo Sun. "Distributed Event-Triggered Voltage Control with Limited Re-Active Power in Low Voltage Distribution Networks." Electronics 10, no. 2 (January 8, 2021): 128. http://dx.doi.org/10.3390/electronics10020128.

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A high proportion of photovoltaic (PV) connections to a low-voltage distribution network (LVDN) causes serious voltage problems. In order to ensure voltage stability for renewable energy networks, we propose a distributed reactive voltage control strategy that is event-triggered. The voltage information of the PV nodes is transmitted to the upper layer of the communication network, where the agent calculates the output set value of the PV inverter. The underlying control strategy is based on the voltage sensitivity matrix, and the upper-level control strategy is based on an event-triggered consensus protocol. This strategy can accommodate the requirements for multi-time modeling and control. We verified the convergence of the event-triggered control algorithm using numerical analysis and proved the reduction of the communication times. We conducted case studies and simulation experiments to verify the effectiveness of our proposed voltage control strategies.

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48

Luo, Yanyu, Minyou Chen, Wenfa Kang, and Xiaoluo Sun. "Distributed Event-Triggered Voltage Control with Limited Re-Active Power in Low Voltage Distribution Networks." Electronics 10, no. 2 (January 8, 2021): 128. http://dx.doi.org/10.3390/electronics10020128.

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A high proportion of photovoltaic (PV) connections to a low-voltage distribution network (LVDN) causes serious voltage problems. In order to ensure voltage stability for renewable energy networks, we propose a distributed reactive voltage control strategy that is event-triggered. The voltage information of the PV nodes is transmitted to the upper layer of the communication network, where the agent calculates the output set value of the PV inverter. The underlying control strategy is based on the voltage sensitivity matrix, and the upper-level control strategy is based on an event-triggered consensus protocol. This strategy can accommodate the requirements for multi-time modeling and control. We verified the convergence of the event-triggered control algorithm using numerical analysis and proved the reduction of the communication times. We conducted case studies and simulation experiments to verify the effectiveness of our proposed voltage control strategies.

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Galvão, Thiago, and Domingos Simonetti. "A Low-Power Setup Proposal for Power Transformer Loading Tests." Energies 12, no. 21 (October 30, 2019): 4133. http://dx.doi.org/10.3390/en12214133.

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A setup for testing transformers under load through low power converter is presented in this paper. This setup is used for testing power transformers as it allows to verify their performance under operating conditions regarding aspects such as heating, voltage regulation, and mounting robustness. The main goal of the study is centered on replacing a full power Back-to-Back converter (1 pu) by a fractional power one (less than 0.1 pu). The converter, a Voltage Source Inverter (VSI), is a series connected between two equally sized transformers and controls the current flowing in the system. Load profile configurations set according to power factor, current harmonics, or even power level can be imposed to evaluate the performance of the Transformer Under Test (TUT) and the entire system. Theoretical analysis, and simulation results employing Matlab/Simulink platform, considering a typical transformer of a 75 kVA power distribution grid with 13.8 kV/220 V voltage are presented to corroborate the proposal. The required VSI power achieved in the simulations is a fraction of the total power of transformer under test, and the grid power consumed is also of small order justified by losses.

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Fu, Hao, Xu Jie He, Xiao Tong, Ye Wei Tao, Pei Qiang Lv, and Tong Jiang. "Research on Control Strategy for Low-Voltage Looped Network." Applied Mechanics and Materials 668-669 (October 2014): 753–56. http://dx.doi.org/10.4028/www.scientific.net/amm.668-669.753.

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This paper proposes a scheme of the looped network applied to low-voltage distribution network and introduces the control strategy for looped network in the normal event of a distribution network failure. Besides, the paper shows the superiority of the looped network in reducing the outage time and improving the power distribution reliability.

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Journal articles on the topic 'Low voltage power distribution'

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