Simulation and Protection of Reignition Overvoltage in Wind Farm Considering Microscopic Dielectric Recovery Process of Vacuum Circuit Breaker

Ziheng Pu, Hao Liu (), Yaoqiang Wang, Xinyun Yu and Tian Wu
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Ziheng Pu: College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China
Hao Liu: College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China
Yaoqiang Wang: Hainan Jinpan Electric Research Institute Co., Ltd., Wuhan 430074, China
Xinyun Yu: College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China
Tian Wu: College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China

Energies, 2023, vol. 16, issue 4, 1-16

Abstract: The high amplitude and steep overvoltage generated by the breaking of the vacuum circuit breaker in the wind farm damages the inter-turn insulation of the transformer. There is a certain difference between the simulation results of the traditional reignition model and the measured overvoltage. It is necessary to improve the simulation model to simulate the overvoltage condition of the transformer more accurately and then select appropriate overvoltage protection measures. In this paper, based on the physical process of dielectric recovery during the opening process of the vacuum circuit breaker, a model of dielectric strength recovery is built to simulate the arc reignition of the vacuum circuit breaker. The model was applied to compare the overvoltage protection effects of RC snubbers, surge arresters, and choke coils. The simulation results show that the overvoltage amplitude and reignition times calculated by the model proposed in this paper are closer to the measured values. Compared with the traditional linear curve reignition model, the accuracy was increased by 24% and 51.2%, respectively. The parameter value of RC snubbers, the connection mode of surge arresters, and the combination mode of choke coil have an influence on overvoltage suppression. Finally, a suitable suppression scheme is proposed by installing a combined arrester on the high-voltage side of the transformer and connecting a choke coil in series, which can limit the phase-to-ground voltage and the phase-to-phase voltage to 2.43 p.u and 3.24 p.u, respectively, and reduce the steepness from 157.2 kV/μs to 22.3 kV/μs.

Keywords: wind farm; vacuum circuit breaker; microscopic dielectric; reignition; overvoltage protection (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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