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Volume 12, Issue 4 (2-2024) |
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A New Hybrid Loss of Excitation Protection Scheme based on the Execution of the Most Effective Variables of Synchronous Generators
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Mohammad Sajad Fatholahi   , Saman Hosseini Hemati * , Abdollah Rastgo , Saeed Kharti |
| Department of Electrical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran |
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Abstract: (114 Views) |
The most common disadvantages of impedance relays are its improper operation in the conditions of disturbances of the power system and its long operation time. Based on this, in order to improve the accuracy and speed of detection of the event of excitation interruption and distinguish it from other transient events of the power system, a comprehensive study has been conducted on various measurable parameters of the synchronous generator. Based on the analysis, the most basic variables including active power (Psg), angle between voltage and output current (θsg) and machine output current (Isg) were selected and used in a precise combination logic. In this structure, the changes of Isg machine are continuously monitored and if it increases to more than the defined threshold, the changes of Psg and θsg parameters are investigated. In such a case, the increase of Psg indicates the response of the car control system and the normal operation of the car will continue. However, if Psg is almost constant and θsg is positive (under-excited state), the increase of Isg over the permissible limit indicates that the excitation system is inactive and as a result, the reactive power is received more than the under-excited limit, so the trip command The generator is exported. In fact, the reason for the increase of the output current of the machine to more than the defined threshold (while Psg is constant and θsg is positive) is the high absorption of reactive power from the power system due to the occurrence of excitation interruption. The proposed hybrid method of this study has been evaluated in the MATLAB/Simulink (2017b) software environment during different scenarios of power system transients and excitation interruptions on IEEE 39-bus standard system. The results of the simulations confirm the effectiveness of the proposed protection model. It should be noted that the superiority of the proposed method from the points of view of accuracy, speed, simplicity and implementation cost has also been compared with other designs.
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| Keywords: loss of excitation protection, impedance relay, Angle between voltage and current, active power, current. |
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Full-Text [PDF 1128 kb]
(46 Downloads)
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Type of Study: Applicable |
Subject:
Special
Received: 2024/01/6 | Accepted: 2024/02/21 | Published: 2024/02/29
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Fatholahi M S, Hosseini Hemati S, Rastgo A, Kharti S. A New Hybrid Loss of Excitation Protection Scheme based on the Execution of the Most Effective Variables of Synchronous Generators. تحقیقات نوین در سیستمهای قدرت هوشمند 2024; 12 (4) :65-75 URL: http://jeps.dezful.iau.ir/article-1-495-en.html
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