Pilot Protection Based on Zero-Sequence Current Resistance-Capacitance Component for Large-Scale Inverter-Interfaced Power Stations

Qian He, Gong He, Zheng Li (), Meichen Lin, Gexiang Zhang and Xuedong Li
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Qian He: State Grid Chongqing Electric Power Company, Chongqing 400014, China
Gong He: State Grid Chongqing Electric Power Company, Chongqing 400014, China
Zheng Li: School of Automation, Chengdu University of Information Technology, Chengdu 610025, China
Meichen Lin: School of Automation, Chengdu University of Information Technology, Chengdu 610025, China
Gexiang Zhang: School of Automation, Chengdu University of Information Technology, Chengdu 610025, China
Xuedong Li: JoinBright Digital Power Technology Co., Ltd., Beijing 100085, China

Sustainability, 2022, vol. 14, issue 20, 1-22

Abstract: At present, zero-sequence current protection is generally used as the main protection for single-phase ground faults in resistance-grounded inverter power stations. However, limited by the principle, it is difficult for current protection to take into account selectivity and rapid action when the neutral point resistance is large, so there is protection mismatch with the inverter-type power supply for low voltage ride through leads to the risk of large-scale disconnection of non-fault lines. Aiming at the above problems, firstly, a fault analysis model of the inverter power station considering the capacitance to ground is established to study the distribution characteristics of resistive and capacitive zero-sequence currents in the collection system, when single-phase ground short circuit occurs on different types of lines. Then, based on the characteristic difference between the resistance and capacitance components of the zero-sequence current flowing through the two ends of the tie line in case of internal and external faults, a zero-sequence pilot protection algorithm is formed. Compared with the traditional zero-sequence current differential protection, the proposed protection algorithm only transmits logic information without synchronous sampling, and has significant economy. Finally, the feasibility and effectiveness of the proposed protection algorithm are verified by an engineering simulation example.

Keywords: inverter-interfaced power generator; resistance grounding system; fault characteristic analysis; zero-sequence pilot protection; low voltage ride-through (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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