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Journal articles on the topic 'Power system transients'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 June 2025

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1

Sinha, Pampa, Sudipta Debath, and Swapan Kumar Goswami. "Classification of Power Quality Events Using Wavelet Analysis and Probabilistic Neural Network." IAES International Journal of Artificial Intelligence (IJ-AI) 5, no. 1 (2016): 1. http://dx.doi.org/10.11591/ijai.v5.i1.pp1-12.

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<p>Power quality studies have become an important issue due to widespread use of sensitive electronic equipment in power system. The sources of power quality degradation must be investigated in order to improve the power quality. Switching transients in power systems is a concern in studies of equipment insulation coordination. In this paper a wavelet based neural network has been implemented to classify the transients due to capacitor switching, motor switching, faults, converter and transformer switching. The detail reactive powers for these five transients are determined and a model which uses the detail reactive power as the input to the Probabilistic neural network (PNN) is set up to classify the above mentioned transients. The simulation has been executed for an 11kv distribution system. With the help of neural network classifier, the transient signals are effectively classified.</p>

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2

Warizmi, Alka, Indra Roza, and Ahmad Yanie. "Transient Analysis on Switching Capacitor Bank Using Power Factor Regulator." Journal of Renewable Energy, Electrical, and Computer Engineering 5, no. 1 (2025): 86–92. https://doi.org/10.29103/jreece.v5i1.18707.

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This study discusses the analysis of transients that occur in capacitor bank switching using a power factor regulator (PFR). Electric power systems use capacitor banks to offset reactive power, enhance power factors, and minimize energy losses. However, the switching process in capacitor banks can cause significant voltage and current spikes, known as transient phenomena, which can damage equipment and disrupt system stability. This study conducts simulations and analyzes the impact of transients that occur during the capacitor bank switching process on the electric power system. The simulation is carried out using software that models the behavior of the electric power system, focusing on how the power factor regulator regulates the switching process and its impact on the resulting transients. The simulation results show that the use of PFR can reduce the negative impact of transients, but improper settings can still cause disturbances that have the potential to damage the system. These findings provide important insights for system engineers in designing and operating more reliable power systems, considering the importance of proper settings on the power factor regulator to minimize the effects of transients on capacitor bank switching. This study also recommends several mitigation strategies to reduce the impact of transients and improve overall system stability.

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Grebović, Selma, Nermin Oprašić, Ajdin Fejzić, Harun Kartal, Abdulah Akšamović, and Samim Konjicija. "A Low Cost Real-Time Transient Recorder for High Voltage Systems." Sensors 23, no. 24 (2023): 9769. http://dx.doi.org/10.3390/s23249769.

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Large-scale incorporation of new energy generation units based on renewable sources, such as wind and photovoltaic power, drastically alters the structure of the power system. Because of the intermittent nature of these sources, switching in grids (connection and disconnection) occurs much more frequently than with conventional sources. As a result, the power system will inevitably experience a large number of transients, which raises questions about the stability of the system and the quality of the electrical energy. Therefore, measuring various types of transients in power system is crucial for stability, power quality, fault analysis, protection design, and insulation design. Transient recorders that are currently used are generally expensive and only suitable for particular locations in power systems. The number of installed transient recorders is insufficient for a comprehensive analysis of problems that may occur. Hence, it is important to have inexpensive and efficient transient recorders that can be installed at multiple points in the power system on various types of objects. It is also essential to have a transient record database with open access, which can be used by researchers to develop new analysis techniques based on artificial intelligence. This paper proposes an inexpensive measurement and acquisition system designed to record transient phenomena on different objects within the power system. The system is designed to use autonomous power, a standardized data acquisition module, a low-budget system for transmitting recorded transient events to the server via mobile network, and a sensor system adapted to the object where transients are recorded. The proposed system is designed to be used for all types of objects in the power system where transients may occur, such as power lines, transmission towers, surge arresters, and transformers. All components of the system are described, and the system is tested under laboratory conditions. The modular nature of the system allows customization to the specifics of the location in power system by choosing appropriate components. The calibration method of the custom designed Rogowski coil is described. The cost analysis of the proposed system and power consumption analysis are performed. The results show that the system’s performance meets application requirements at a low cost.

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Alam, M. Shafiul, Md Shamimul Haque Chowdhury, and Muhammad Athar Uddin. "Power System Switching Transient Detection using Wavelet Transformed Based Signal Decomposition." IIUC Studies 7 (October 19, 2012): 241–48. http://dx.doi.org/10.3329/iiucs.v7i0.12270.

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Switching transient phenomena in Electric Power System develop several disturbances, sometimes very hazardous for the electrical equipment life, for the environment and for the human life. Switching transient phenomena produce over voltage, over current and electrical fields, which haven't to neglect. Several types of wavelet network algorithms have been considered for detection of power system switching transients. But both time and frequency information are accessible by multiresolution analysis (MRA). This paper presents a wavelet transform based multiresolution analysis of power system signal to detect, localize and extract switching transients. Power system switching transients have been simulated using MATLAB-7.01. The key idea underlying the approach is to decompose a distorted signal into other signals which represents a smoothed version and detailed version of the original signal. The decomposition is performed using multiresolution analysis. The proposed method appears to be robust for detection and localization of power quality disturbances produced due to load switching and capacitor switching. DOI: http://dx.doi.org/10.3329/iiucs.v7i0.12270 IIUC Studies Vol.7 2011: 241-248

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5

Rashid, Umar, and Javed Dhillon. "Transients Analysis in AC Microgrid System." Journal of Physics: Conference Series 2327, no. 1 (2022): 012009. http://dx.doi.org/10.1088/1742-6596/2327/1/012009.

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Abstract In the modern power system, small scale versions of the power grid termed as Microgrid are being greatly used because of the practical, economic and environmental advantages over conventional structure. Microgrid as the word itself suggests (micro-small and grid-interconnection of different elements) is the advanced technology that is being currently endorsed for future power systems in electrical engineering world. Transients are produced in microgrids due to the fluctuating nature of loads and the irregular behaviour of renewable power generation, particularly whenever the transition from grid linked to islanded state happens. In this paper, for controlling the transients during the transition in islanded mode in microgrid comprising of various energy resources like Diesel Generator, Solar Photovoltaic System, Energy Storage System, Flux Coupling Type Super Conducting Fault Current Limiter (FSFCL) is used. By incorporating the FSFCL in the microgrid, transient behaviour of the microgrid is greatly improved. The model analysis is done using the MATLAB’s Simulink Software and the output results in presence and absence of Flux coupling type SFCL is compared. The output results which are obtained show the supremacy of the suggested device in reducing the transients in microgrid.

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6

Galli, A. W., and O. M. Nielsen. "Wavelet analysis for power system transients." IEEE Computer Applications in Power 12, no. 1 (1999): 16–25. http://dx.doi.org/10.1109/67.738314.

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7

Robertson, D. C., O. I. Camps, J. S. Mayer, and W. B. Gish. "Wavelets and electromagnetic power system transients." IEEE Transactions on Power Delivery 11, no. 2 (1996): 1050–58. http://dx.doi.org/10.1109/61.489367.

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8

Chakraborty, Arindam, Shravana K. Musunuri, Anurag K. Srivastava, and Anil K. Kondabathini. "Integrating STATCOM and Battery Energy Storage System for Power System Transient Stability: A Review and Application." Advances in Power Electronics 2012 (December 17, 2012): 1–12. http://dx.doi.org/10.1155/2012/676010.

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Integration of STATCOM with energy storage devices plays an imperative role in improving the power system operation and control. Significant research has been done in this area for practical realization of benefits of the integration. This paper, however, pays particular importance to the performance improvement for the transients as is achievable by STATCOM with battery-powered storage systems. Application of STATCOM with storage in regard to intermittent renewable energy sources such as wind power generation is also discussed in the paper. At the beginning of this paper, an overall review of the STATCOM and energy storage systems are elaborated. A brief overview of the advantages of using STATCOM in conjunction to energy storage systems in achieving power system stability is presented. In the second part of the paper, a typical transient stability model of a STATCOM is presented. The dynamics of real and reactive power responses of the integrated system to transients is studied. The study is aimed at showing that the combination of STATCOM and battery energy storage significantly improves the performance of the system. The final results show that the STATCOM reactive power/voltage control helps in transient stability enhancement.

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9

Sowa, Paweł, and Daria Zychma. "Dynamic Equivalents in Power System Studies: A Review." Energies 15, no. 4 (2022): 1396. http://dx.doi.org/10.3390/en15041396.

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In this paper, the available methods and procedures for creating equivalents for the analysis of electromagnetic transients in power systems are presented and discussed. General requirements of power system representation during simulation of electromagnetic transients are shown. The main available procedures are shown, along with an assessment of their advantages and disadvantages. Methods to search for the optimal replacement of structures in time and frequency domains are discussed. Optimization and direct methods in the frequency domain are presented. Each of these methods is discussed with respect to their possible use in determining the structure of the equivalent circuit for the study of electromagnetic phenomena. Methods to reduce a complex power system, as one of the approaches to determining the structure and parameters of the equivalent circuit, are also presented. Contraindications to the search for equivalents in the frequency domain to study electromagnetic transients are discussed. An analysis of methods for the identification of parameters of the equivalents is presented. The latest advances in the search for the structure and parameters of equivalents are presented, particularly the use of artificial neural networks in the process of replacing parts of systems. Finally, the analyses conducted in this study, together with recommendations regarding the choice of the procedure during the search for equivalents for the analysis of electromagnetic transient phenomena, are summarized.

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10

Bohre, Aashish Kumar, and Biman Kumar Saha Roy. "Over current protection of distribution system with impact of solar and wind generation using DIgSIlent power factory." International Journal of Engineering, Science and Technology 14, no. 3 (2022): 122–31. http://dx.doi.org/10.4314/ijest.v14i3.14s.

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The utilization of renewable resources has been growing very fast worldwide recently to manage the increasing energy gap, but it also raises some challenges like protection issues, transient stability issues and security issues in the power system operation. Mainly, wind and solar photovoltaic renewable power generation sources are account for bulky renewable energy share. The transients in power systems including renewables are reduced and have recently attracted wide attention. The impact of renewables generation on power system transients should be effectively analyzed and evaluated to improve power system reliability, stability, operation and security. DIgSILENT Power Factory software is more powerful and useful for providing phasor of fundamental power frequency components better than other existing software’s; therefore, DIgSILENT Power Factory is proposed for modeling and analysis of the system.

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11

Varetsky, Yuriy. "Simulation of transients for designing multiple power filter circuits." Computational Problems of Electrical Engineering 7, no. 2 (2017): 117–23. https://doi.org/10.23939/jcpee2017.02.117.

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The practice of operating multiple single-tuned filters in industrial power supply systems has shown that technological transformer capacitors in switching filters within the systems can cause the damage of filters. The most disturbing loads on the power supply systems are powerful AC arc furnaces. Static Var compensators used in the power supply systems contain multiple harmonic filters for harmonic mitigation and reactive power compensation. For examining the impact of the supply system and filter configuration on transient overvoltages and overcurrents in the reactor and capacitor bank of the filter during switching events, an arc furnace power supply system was chosen as an example. The transient analysis has been carried out by simulating transients within Matlab/Simulink software. In the research, the most typical switching events and harmonic impact on the transient overvoltages have been analysed. The paper focuses on the selection of ratings for capacitors and air-core reactors used in multiple single-tuned harmonic filter configurations based on the ANSI/IEEE Standards and the results of transient simulations. The comparison of reactor and capacitor bank ratings of the filter circuits selected on the base of steady state operation and transient requirements has been shown.

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12

Guillén, Daniel, Gina Idárraga-Ospina, and Camilo Cortes. "A New Adaptive Mother Wavelet for Electromagnetic Transient Analysis." Journal of Electrical Engineering 67, no. 1 (2016): 48–55. http://dx.doi.org/10.1515/jee-2016-0007.

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Abstract Wavelet Transform (WT) is a powerful technique of signal processing, its applications in power systems have been increasing to evaluate power system conditions, such as faults, switching transients, power quality issues, among others. Electromagnetic transients in power systems are due to changes in the network configuration, producing non-periodic signals, which have to be identified to avoid power outages in normal operation or transient conditions. In this paper a methodology to develop a new adaptive mother wavelet for electromagnetic transient analysis is proposed. Classification is carried out with an innovative technique based on adaptive wavelets, where filter bank coefficients will be adapted until a discriminant criterion is optimized. Then, its corresponding filter coefficients will be used to get the new mother wavelet, named wavelet ET, which allowed to identify and to distinguish the high frequency information produced by different electromagnetic transients.

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13

Zychma, Daria, and Paweł Sowa. "Electromagnetic Transients in Multi-Voltage Transmission Lines during Non-Simultaneous Faults." Energies 15, no. 3 (2022): 1046. http://dx.doi.org/10.3390/en15031046.

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It is vitally important that a transmission network provides a continuity of electricity to end users and that the transmission system operator prioritizes its safety and reliability. This article presents the possibilities of using multi-track overhead lines with varying levels of rated voltage, run on a common support structure. This solution would ensure safe operation of the system, reduce the area used for the construction of new overhead lines, and, at the same time increase the transmission network capacity. This article focuses on the method of modeling overhead lines for the analysis of electromagnetic transient states that occur during non-simultaneous disturbance phenomena. This article presents the idea of multi-circuit, multi-voltage lines and their validity of use in power systems. An analysis of electromagnetic transient states for non-simultaneous disturbances in multi-path, multi-voltage lines is presented. This analysis has been made on the basis of a network model, using ATP-EMTP (Alternative Transients Program-Electromagnetic Transients Program) software for solutions, for a Polish power system. Particular attention was paid to the most unfavorable phenomena appearing in the modeled system. The impact of the emerging electromagetic transients in multi-path, multi-voltage lines was evaluated. It was shown that the specificity and rapid changeability of the emerging electromagnetic transients and lack of a universal model of the overhead power line make the analyses of electromagnetic transients highly labor-intensive and time-consuming. Each change is connected with the necessity to create new line models for the study of electromagnetic transient states dependent on many factors.

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14

Shornikov, Yury, and Evgeny Popov. "Modeling and simulation of transients in electric power systems using hybrid system theory." ITM Web of Conferences 24 (2019): 02012. http://dx.doi.org/10.1051/itmconf/20192402012.

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Transients in electric power systems are of great interest to power engineers when designing a new or maintaining an existing system. The paper deals with using hybrid system theory for modeling and simulation of an electric power system with controllers. The presented technique is rather convenient and recommended as mathematical models of transients in electric power systems with controllers in general contain both continuous and discrete components. The modeling and simulation were carried out in the modeling and simulation environment ISMA, which is briefly presented in the paper.

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15

Bollen, M. H. J., E. Styvaktakis, and I. Y. H. Gu. "Categorization and Analysis of Power System Transients." IEEE Transactions on Power Delivery 20, no. 3 (2005): 2298–306. http://dx.doi.org/10.1109/tpwrd.2004.843386.

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16

Wilkinson, W. A., and M. D. Cox. "Discrete wavelet analysis of power system transients." IEEE Transactions on Power Systems 11, no. 4 (1996): 2038–44. http://dx.doi.org/10.1109/59.544682.

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17

Keri, A. J. F. "Power System Transients: Parameter Determination [Book Review." IEEE Power and Energy Magazine 8, no. 6 (2010): 98–104. http://dx.doi.org/10.1109/mpe.2010.938197.

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18

Varetsky, Yuriy. "Overvoltages on power filters under energizing industrial power system transformer." Energy engineering and control systems 6, no. 2 (2020): 97–103. http://dx.doi.org/10.23939/jeecs2020.02.097.

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The practice of operating industrial power supply systems containing filter circuits has shown that filter tuning can have a significant impact on filter performance. On the basis of simulations of a real power supply system carried out by the Matlab / Simulink package, the results of a study of the impact of filter manufacturing tolerances on the filter transients under transformer energizing are presented. The most severe transients are observed for filter circuits in the power supply systems of electric arc furnaces due to frequently repeated operating energizing furnace transformers. This article summarizes the analysis of overvoltages on capacitors and reactors for various configurations of the filter circuit, arising during energizing the arc furnace transformer, taking into account the possible detuning of the filters.

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19

Probst, Felipe L., Michael Beltle, and Stefan Tenbohlen. "Measurement of Transient Overvoltages by Capacitive Electric Field Sensors." Sensors 24, no. 5 (2024): 1357. http://dx.doi.org/10.3390/s24051357.

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The accurate measurement and the investigation of electromagnetic transients are becoming more important, especially with the increasing integration of renewable energy sources into the power grid. These sources introduce new transient phenomena due to the extensive use of power electronics. To achieve this, the measurement devices must have a broadband response capable of measuring fast transients. This paper presents a capacitive electric field sensor-based measurement system to measure transient overvoltages in high-voltage substations. The concept and design of the measurement system are first presented. Then, the design and concept are validated using tests performed in a high-voltage laboratory. Afterwards, two different calibration techniques are discussed: the simplified method (SM) and the coupling capacitance compensation (CCC) method. Finally, three recorded transients are evaluated using the calibration methods. The investigation revealed that the SM tends to overestimate the maximum overvoltage, highlighting the CCC method as a more suitable approach for calibrating transient overvoltage measurements. This measurement system has been validated using various measurements and can be an efficient and flexible solution for the long-term monitoring of transient overvoltages in high-voltage substations.

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Navneet, Kaur, and Deep Yadav Gagan. "Power Quality Improvement in Power System using UPFC." International Journal of Trend in Scientific Research and Development 2, no. 1 (2017): 832–37. https://doi.org/10.31142/ijtsrd7139.

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Occurrence of a fault in a power system causes transients. To stabilize the system, Power System Stabilizer PSS and Automatic Voltage Regulator AVR are used. Load flow analysis is done to analyze the transients introduced in the system due to the occurrence of faults. The Flexible Alternating Current Transmission FACTS devices such as UPFC are becoming important in suppressing power system oscillations and improving system damping. The UPFC is a solid state device, which can be used to control the active and reactive power. This paper considers a power system as a case study for investigating the performance of UPFC is achieving stability. By using a UPFC the oscillation introduced by the faults, the voltage deviations and speed deviations can be damped out quickly than a system without a UPFC. The effectiveness of UPFC in suppressing power system oscillation is investigated by analyzing their voltage deviations and reactive power support in this paper. A proportional integral PI controller has been employed for the UPFC. It is also shown that a UPFC can control independently the real and reactive power flow in a transmission line. Navneet Kaur | Gagan Deep Yadav "Power Quality Improvement in Power System using UPFC" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-1 , December 2017, URL: https://www.ijtsrd.com/papers/ijtsrd7139.pdf

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21

Yan, Yi Peng, Yue Gu, Mei Liu, and Wei Jian Zhu. "Review on External System Equivalent Method of Power Systems Electromagnetic Transients Simulation." Applied Mechanics and Materials 543-547 (March 2014): 493–98. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.493.

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Electromagnetic transients simulation for the actual large-scale power systems usually needs long time. How to achieve the equivalent circuit of the external system and reduce the simulation system scale is one of hot topics in this field for a long time. In the paper, the main equivalent methods of external system are classified, the main content and process of each type method are described and its advantages and disadvantages are analyzed. On this basis, the development tendency and the key issues needing to be broken through for the external system equivalent method of power systems electromagnetic transients simulation are also presented in the paper.

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Eleschová, Žaneta, Martin Jedinák, and Rastislav Šmidovič. "Analysis of Transients during the Power System Restoration." TRANSACTIONS ON ELECTRICAL ENGINEERING 7, no. 4 (2020): 73–78. http://dx.doi.org/10.14311/tee.2018.4.073.

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The paper presents simulation results of transients during the power system restoration. The Defence plan and Restoration plan development is a part of transmission system operator’s responsibilities and requires thorough calculations, simulations and publication of instructions. The plans focus on extensive failures that have a heavy impact on the system operation and could lead to a blackout. The Restoration plan of power system has to contain procedures for start-up without outside help. TSO regularly checks some part of the Restoration plan.

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23

Jenkins, L. "Book Review: ‘Power System Transients — a statistical approach’." International Journal of Electrical Engineering & Education 34, no. 1 (1997): 96. http://dx.doi.org/10.1177/002072099703400118.

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Yang, Liming, Xiaoning Kang, Jiale Suonan, Zaibin Jiao, and Guobing Song. "Fast algorithm for estimating power frequency phasors under power system transients." IET Generation, Transmission & Distribution 9, no. 4 (2015): 395–403. http://dx.doi.org/10.1049/iet-gtd.2014.0571.

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Patil, Vinoda, and Prof Nandakumar. "Mitigation of Power System Transients in a Multi- Machine System Using STATCOM." International Journal for Research in Applied Science and Engineering Technology 10, no. 5 (2022): 3200–3208. http://dx.doi.org/10.22214/ijraset.2022.43034.

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Abstract: The tremendous expansion of linked power systems as a result of rising electrical energy consumption has created a slew of problems. FACTS (Flexible Alternating Current Transmission System) controllers become crucial in these situations. This paper investigates the transient stability enhancement of IEEE 9 bus system using STATCOM. The damping power oscillations and power swings and setting time is observed with and without STATCOM. Keywords: PI controller Power, D-Q theory. Reactive and Active Power STACOM

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Jurišić, Bruno, Luka Bučar, and Ivo Uglešić. "Calculation of voltage distribution along the transformer winding using the wide band transformer model." Journal of Energy - Energija 66, no. 1-4 (2022): 40–51. http://dx.doi.org/10.37798/2017661-495.

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Electrical devices in transmission and distribution networks are submitted to fast front transients. These transients are often a cause of a failure in the power system. To simulate these phenomena, it is necessary to detailly model all the components of the power system. This paper concentrates on studding transformer internal failures due to voltage stress that can occur when fast front electromagnetic wave travels through the transformer. To prevent a failure, an internal insulation of the transformer has to be dimensioned to sustain these transient phenomena. Therefore, it is necessary to use advanced wideband transformer models for its dimensioning. In this paper, a wide band transformer model based on limited transformer geometry is used to simulate evaluate the stresses on internal transformer insulation in the case of fast front transients. The model is validated for calculation of internal overvoltages with the test case from CIGRE brochure.

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Singh, S. N. "A Practical Approach to Teaching Power System Transients in the Electrical Engineering Curriculum." International Journal of Electrical Engineering & Education 40, no. 2 (2003): 144–57. http://dx.doi.org/10.7227/ijeee.40.2.5.

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Power system transients, which are always present in a system due to switching in the presence of inductance and capacitance, are unwanted things. They are an ignored topic in the electrical engineering curriculum of many institutes. This paper presents our new attempt to teach electric power system transients for graduate students of the Electric Power System Management Energy Program at the Asian Institute of Technology (AIT), Thailand.

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Hopkins, Douglas C., Yuan-Bo Guo, Herbert E. Dwyer, and James D. Scofield. "Development of a SiC SSPC Module with Advanced High Temperature Packaging." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2010, HITEC (2010): 000310–15. http://dx.doi.org/10.4071/hitec-dhopkins-wp25.

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Development of a multi-chip power module (MCPM) is reported that uses advanced metal-matrix composite aluminum packaging to manage high thermally induced stresses in devices that incur 350°C transients. The MCPM uses parallel SiC devices to control 120A DC nominal, 1200A fault in a 270V DC system. Electrical system modeling is presented to characterize electrical fault transients that induce electrical and thermal stresses in the semiconductors and packaging. The characterization of the advanced aluminum-based packaging system, which uses composites, such as AlSiC, and direct bonded aluminum (DBA), is discussed to manage the thermal stresses and transient heat flow.

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Osipov, A. V., and D. N. Kurilkin. "Assessment of the switching time and fluid type influence on the transient quality in hydro-mechanical systems." Journal of Physics: Conference Series 2131, no. 2 (2021): 022058. http://dx.doi.org/10.1088/1742-6596/2131/2/022058.

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Abstract The number of transients in hydro-mechanical power transmissions accounts for a significant portion of the total operating time and has a significant impact on drive economy. The quality of the transients largely depends on their duration and the type of working fluid used. The purpose of the work is to analyze the transients in the hydro-mechanical system, taking into account the effect of the duration of switching processes and the type of working fluid used. Determination of transient parameters in the hydro-mechanical power transmission was performed on the basis of mathematical dependences describing the switching process of two torque converters depending on the duration of the filling and emptying process and the influence of the type of working fluid used. Analysis of the calculated characteristics of transients in hydromechanical power transmissions showed that the main factor in the switching of torque converters, is the combination of filling and emptying processes, depending on the type of working fluid used. The obtained results give grounds to propose recommendations on coordination of filling and emptying processes in order to increase the efficiency of the hydromechanical drive.

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Clamens, Olivier, Johann Lecerf, Jean-Pascal Hudelot, et al. "Assessment of the 3He pressure inside the CABRI transient rods - Development of a surrogate model based on measurements and complementary CFD calculations." EPJ Web of Conferences 170 (2018): 04005. http://dx.doi.org/10.1051/epjconf/201817004005.

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CABRI is an experimental pulse reactor, funded by the French Nuclear Safety and Radioprotection Institute (IRSN) and operated by CEA at the Cadarache research center. It is designed to study fuel behavior under RIA conditions. In order to produce the power transients, reactivity is injected by depressurization of a neutron absorber (3He) situated in transient rods inside the reactor core. The shapes of power transients depend on the total amount of reactivity injected and on the injection speed. The injected reactivity can be calculated by conversion of the 3He gas density into units of reactivity. So, it is of upmost importance to properly master gas density evolution in transient rods during a power transient. The 3He depressurization was studied by CFD calculations and completed with measurements using pressure transducers. The CFD calculations show that the density evolution is slower than the pressure drop. Surrogate models were built based on CFD calculations and validated against preliminary tests in the CABRI transient system. Studies also show that it is harder to predict the depressurization during the power transients because of neutron/3He capture reactions that induce a gas heating. This phenomenon can be studied by a multiphysics approach based on reaction rate calculation thanks to Monte Carlo code and study the resulting heating effect with the validated CFD simulation.

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Jayasree, T., Harison D. Sam, and T. Jayanthy. "Discrete Wavelet Transform for the Detection of Transient Disturbances." Advancement of Signal Processing and its Applications 7, no. 1 (2024): 9–13. https://doi.org/10.5281/zenodo.10673399.

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<em>This paper presents the applications of Discrete Wavelet Transform (DWT) for the detection of transient disturbances. Electrical transients can happen in power systems from different sources and have adverse things on the equipment and dependability of the power system. This paper proposes Discrete Wavelet Transform (DWT) based methodology for the detection of transient disturbances. In this method wavelet coefficients are used for the for finding the amplitude variations of the transient signals at different time and frequencies. </em>

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Górski, Dominik Andrzej. "Analysis of squirrel-cage induction generator start-up supported by reactive power compensator." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 39, no. 2 (2019): 265–78. http://dx.doi.org/10.1108/compel-04-2019-0149.

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Purpose The power electronic converter is used for the satisfaction of reactive power demand of induction generator, when grid-tied. This paper aims to present an application of STATCOM to reduce inrush transient caused by the connection of a squirrel-cage induction generator (SCIG) to the grid. Design/methodology/approach The power generation system consists of an uncontrolled prime mover, a SCIG and a power electronic converter connected to the grid. The three-phase Neutral Point Clamped (NPC) converter works as a STATCOM to satisfy a reactive power demand of the generator. A control scheme of STATCOM uses the x-y reference frame rotating synchronously with grid voltage vector and the p-q instantaneous power theory to calculate q component of grid power. Findings It is shown that the parallel converter, which works as a reactive power compensator allows decreasing transients during a grid connection of the induction generator. Research limitations/implications Transients during a grid connection of the induction generator are only partially decreased. Practical implications It is needed to compensate for the reactive power of a SCIG. The NPC converter works as a STATCOM. The converter partially reduces grid transients during generator connection. The laboratory tests are demonstrated by connection 7.5 kW induction generator to 8 kVA transformer. Originality/value The paper presents the mitigation of grid transients during connection of induction generator with the power electronic converter working as reactive power compensator.

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Stracqualursi, Erika, Giuseppe Pelliccione, Salvatore Celozzi, and Rodolfo Araneo. "Tower Models for Power Systems Transients: A Review." Energies 15, no. 13 (2022): 4893. http://dx.doi.org/10.3390/en15134893.

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Fast-front transients play an important role in the insulation design of any power system. When a stroke hits the shield wire or the tower of high-voltage overhead power lines, flashover may occur either along the span or across tower insulators, depending on the relevant voltages and insulation strength. As a result, backflashover may take place from the tower structure to the phase conductor whenever a huge impulse current flows along the tower towards considerably high footing impedances. For these reasons, tower modeling for transients studies is an important step in the insulation design, and also for lower voltage applications, where indirect lightning effects may play a predominant role. However, after decades of research on tower modeling, starting from the 1930s with the first model proposed by Jordan, no consensus has been reached neither on a widely accepted tower model nor on the quantitative effect of the tower models on insulation design. Moreover, the fundamental mechanisms at the base of the transient response of towers and the definition of some fundamental parameters have not been totally clarified yet. The aim of this review is to present the available tower models developed through the years in the power community, focussing mainly on lumped/distributed circuit models, and to help the reader to obtain a deeper understanding of them.

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Mishra, Sanhita, Sarat Chandra Swain, and Ritesh Dash. "Switching transient analysis for low voltage distribution cable." Open Engineering 12, no. 1 (2022): 29–37. http://dx.doi.org/10.1515/eng-2022-0004.

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Abstract Low voltage cable is primarily connected from the transmission system to several household applications. It is quite common that switching transient in the power system during the energization of the high voltage and low voltage cables have a very crippling effect on the cable as well as the power system components. Hence, an experiment has been performed in the laboratory with a low voltage cable-connected motor system. The experimental results have been validated in the simulation platform, and they are capable of predicting the transient behavior during power cable energization. The effect of transients on power cables during the energization of devices has been investigated in this study in the form of voltage, current, and frequency. Discrete wavelet transform is implemented for the decomposition of the transient current. The generated approximation signal is used to quantify the severity during switching transient condition.

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Fu, Mingjie, Huafeng Cai, and Xinchun Lin. "The Intrinsic Mechanism and Suppression Strategy of Transient Current Imbalance Among Parallel Converters." Electronics 14, no. 4 (2025): 714. https://doi.org/10.3390/electronics14040714.

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Due to the difficulty in achieving a high-power output with a single converter, parallel converters are widely used in high-power applications. However, inconsistency in the output voltage feedback coefficients of individual converters and the associated dispersion in parallel systems often lead to unbalanced current sharing during transient processes, such as load disturbances. This imbalance can result in certain converters being overloaded during transients, leading to premature shutdown. Subsequently, the load on the remaining converters increases, further aggravating the imbalance and triggering additional shutdowns in a domino effect, which may, ultimately, cause the entire parallel converter system to shut down. To address this issue, this study focuses on parallel phase-shift full-bridge systems, analyzing the intrinsic mechanism by which feedback coefficient dispersion affects transient current sharing. A droop control strategy with improved transient virtual impedance is proposed to enhance the current sharing during transients. A simulation and experimental results demonstrate that the proposed strategy significantly improves current sharing during transient processes, effectively enhancing the dynamic performance and reliability of the system.

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Ibrahim, A. I., and H. W. Dommel. "An intelligent support system for the analysis of power system transients." International Journal of Electrical Power & Energy Systems 25, no. 1 (2003): 71–77. http://dx.doi.org/10.1016/s0142-0615(02)00022-4.

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Lei, Heng, and Ying Li. "MATLAB Calculation of Hydraulic Transients in Hydropower Simulation Application." Advanced Materials Research 219-220 (March 2011): 346–50. http://dx.doi.org/10.4028/www.scientific.net/amr.219-220.346.

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In hydropower station in the operation of total with hydraulic transient process of the power station on the transition process analysis and calculation is quite important. This paper introduces the today's advanced scientific computing software MATLAB, and using the software of the Zipingpu hydropower station hydraulic transients from the mathematical model and calculation simulation etc is analyzed and calculated with research, in order to seek appropriate power operation mode, unit close regularities. For power station and water system design optimization, safe operation, provides the basis.

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Li, Guoxin, Zhiyuan Yu, Bowen Zheng, Biao Qi, Ziqing Su, and Di Wang. "Voltage Sag Source Location based on the Random Forest." Journal of Physics: Conference Series 2584, no. 1 (2023): 012144. http://dx.doi.org/10.1088/1742-6596/2584/1/012144.

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Abstract As one of the most prominent power quality problems in the power system, voltage transients threaten the use of many electrical and electronic devices. The rapid and accurate location of voltage drop sources can better define the responsibility between the power supply and the customer. It can also provide a reliable basis for future grid development planning. In this paper, a random forest model is set up to extract data from several electrical characteristics of voltage transients according to the classical voltage transient location method, which is used as training and test samples to input into the random forest model to achieve the upstream and downstream location of voltage transient sources. The random forest model is more accurate than the single decision tree model and the traditional upstream and downstream voltage drop location method. It is possible to determine which of the traditional judgments is more important under this model.

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Nelms, R. M., G. B. Sheble, Steven R. Newton, and L. L. Grigsby. "Using a Personal Computer to Teach Power System Transients." IEEE Power Engineering Review 9, no. 8 (1989): 71. http://dx.doi.org/10.1109/mper.1989.4310923.

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Long, W., D. Cotcher, D. Ruiu, P. Adam, S. Lee, and R. Adapa. "EMTP-a powerful tool for analyzing power system transients." IEEE Computer Applications in Power 3, no. 3 (1990): 36–41. http://dx.doi.org/10.1109/67.56581.

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LUTFUL KABIR, S. M., M. MUJIBUR RAHMAN, and S. MOSKIUR RAHMAN. "COMPENSATION FOR NEGLECTING STATOR TRANSIENTS IN POWER SYSTEM MODELS." Electric Machines & Power Systems 25, no. 3 (1997): 305–16. http://dx.doi.org/10.1080/07313569708955741.

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Akpinar, E., P. Pillay, and S. M. A. Sabur. "Modelling of multimachine transients during unbalanced power system disturbances." Electric Power Systems Research 42, no. 1 (1997): 17–20. http://dx.doi.org/10.1016/s0378-7796(96)01171-6.

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Nelms, R. M., G. B. Sheble, S. R. Newton, and L. L. Grigsby. "Using a personal computer to teach power system transients." IEEE Transactions on Power Systems 4, no. 3 (1989): 1293–94. http://dx.doi.org/10.1109/59.32630.

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Gorinevsky, D., and G. Farber. "System Analysis of Power Transients in Advanced WDM Networks." Journal of Lightwave Technology 22, no. 10 (2004): 2245–55. http://dx.doi.org/10.1109/jlt.2004.833274.

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Moreira, F. A., and J. R. Marti. "Latency Techniques for Time-Domain Power System Transients Simulation." IEEE Transactions on Power Systems 20, no. 1 (2005): 246–53. http://dx.doi.org/10.1109/tpwrs.2004.841223.

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Garcia-Sanchez, Jorge Luis, José Alberto Gutierrez-Robles, José Raul Loo-Yau, et al. "Aerial line model for power system electromagnetic transients simulation." IET Generation, Transmission & Distribution 10, no. 7 (2016): 1597–604. http://dx.doi.org/10.1049/iet-gtd.2015.0834.

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Chul Hwan Kim and R. Aggarwal. "Wavelet transforms in power systems. Part 2: Examples of application to actual power system transients." Power Engineering Journal 15, no. 4 (2001): 193–202. http://dx.doi.org/10.1049/pe:20010404.

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Chenchireddy, Kalagotla, N. Rajasekhar Varma, Pendem Lasya, N. Paven Kalyan Goud, Meegu Nithin, and Mandadi Kumarteja. "Source Current Harmonic Cancellation in Distribution System by Using ANFIS Controller." E3S Web of Conferences 472 (2024): 01003. http://dx.doi.org/10.1051/e3sconf/202447201003.

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Ensuring a reliable and stable power supply to consumers is of utmost importance in modern distribution systems. Many power quality issues, such as voltage fluctuations, harmonic distortions, transient events, load forecasting, and voltage sag/swell compensation, can lead to operational inefficiencies and compromise the performance of sensitive electronic equipment. The main causes of power quality problems are short circuits and overloads, reactive power imbalance, transients, equipment malfunctions, and ground issues. The ANFIS model leverages the strengths of both neural networks and fuzzy logic to effectively address power quality challenges. Thus, by using the ANFIS model for power quality improvement, we reduce the supply current harmonics by maintaining IEEE 519 standards. The stimulation results are implemented using MATLAB Simulink software. The simulation results are verified source current, load current and supply voltage, The THD value of source current.

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Kim, J. C., Jae Boong Choi, Yoon Suk Chang, Young Jin Kim, Youn Won Park, and Young Hwan Choi. "Development of Web-Based Fatigue Life Evaluation System for Reactor Pressure Vessel." Solid State Phenomena 120 (February 2007): 25–30. http://dx.doi.org/10.4028/www.scientific.net/ssp.120.25.

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While the demand on electric power is consistently increasing, public concerns and regulations for the construction of new nuclear power plants are getting restrict, and also operating nuclear power plants are gradually ageing. For this reason, the interest on lifetime extension for operating nuclear power plants by applying lifetime management system is increasing. The 40-year design life concept was originally introduced on the basis of economic and safety considerations. In other words, it was not determined by technological evaluations. Also, the transient design data which were applied for fatigue damage evaluation were overly conservative in comparison with actual transient data. Therefore, the accumulation of fatigue damage may result in a big difference between the actual data and the design data. The lifetime of nuclear power plants is mostly dependent on the fatigue life of a reactor pressure vessel, and thus, the exact evaluation of fatigue life on a reactor pressure vessel is a crucial factor in determining the extension of operating life. The purpose of this paper is to introduce a real-time fatigue monitoring system for an operating reactor pressure vessel which can be used for the lifetime extension. In order to satisfy the objectives, a web-based transient acquisition system was developed, thereby, real-time thermal-hydraulic data were reserved for 18 operating reactor pressure vessels. A series of finite element analyses was carried out to obtain the stress data due to actual transient. The fatigue life evaluation has been performed based on the stress analysis results and, finally, a web-based fatigue life evaluation system was introduced by combining analysis results and on-line monitoring system. Comparison of the stress analysis results between operating transients and design transients showed a considerable amount of benefits in terms of fatigue life. Therefore, it is anticipated that the developed web-based system can be utilized as an efficient tool for fatigue life estimation of reactor pressure vessel.

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Popa, Gabriel Nicolae, and Corina Maria Diniș. "Low-Cost System with Transient Reduction for Automatic Power Factor Controller in Three-Phase Low-Voltage Installations." Energies 17, no. 6 (2024): 1363. http://dx.doi.org/10.3390/en17061363.

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In power engineering, the importance of maintaining a high power factor in low-voltage electrical installations is known. In power substations for industry, the usual method of coupling is to use an automatic power factor controller which connects capacitors banks (with electromagnetic contactors). Sometimes, AC reactors are connected to the phases of the capacitors banks (to reduce transient phenomena and the deforming regime), depending on the desired value of the power factor. This paper presents an analysis (more focused on experimentation) of a low-cost system for automatic regulation of the power factor with a reduction in transients and an increase in the life of contactors (eliminating the electric arc during switching on), with capacitors banks for low-voltage three-phase installations that connect the capacitors banks by means of one three-phase solid-state relay (an expensive device for a quality device; one is used for all capacitors banks) and using several electromagnetic contactors. The automatic power factor adjustment system has a controller with a microprocessor with six outputs, controlled by the phase shift between the current (measured with a current transformer proportional to the current in a bar) and the phase voltage, which is part of a system of distribution bars (L1,2,3, N) from which electrical consumers (e.g., induction motors) are supplied. To reduce transients when connecting capacitors banks, a three-phase solid-state relay and two related electromagnetic contactors are used for each capacitors bank. The automatic power factor controller is connected to two low-capacity PLCs that control the logic of connecting the capacitors banks to reduce transients. By using the proposed regulation system, a cheaper control solution is obtained compared to the use of one solid-state relay for each capacitors banks, under the conditions in which the power factor adjustment is made as in the classic solution. If twelve capacitors banks are used, the proposed installation is 22.57% cheaper than the classical power factor regulation installation.

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