Research on Switching Overvoltage of MMC-MTDC System with Hybrid DC Circuit Breaker

2019 4th Asia Conference on Power and Electrical Engineering

能源学;电工学

Chen, R.Q.^1 ; Ning, L.H.^1 ; Ma, Z.X.^1 ; Yin, Y.J.^1 ; Zhao, Q.X.^2

Smart Power Grid Shaanxi Key Laboratory, Xi'An Jiaotong University, Xi'an

710049, China^1

Power Engineering Supervision Co, Ltd. (Beijing), Beijing

100080, China^2

关键词: Control and protection system;    Dc circuit breakers;    Demonstration project;    Engineering applications;    Modular multilevel converters;    Multi-terminal HVDC;    Recommended values;    Switching overvoltages;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/486/1/012004/pdf
DOI  :  10.1088/1757-899X/486/1/012004

来源: IOP

【 摘 要 】

The modular multilevel converter based multi-terminal HVDC (MMC-MTDC) system with hybrid DC breakers should consider the influence of the action of the DC breaker on the switching overvoltage, which puts higher requirements on the overvoltage protection of the system. Flexible DC demonstration project in Zhangbei will realize the first engineering application of hybrid DC circuit breaker. Based on this project, an overvoltage protection scheme for MMC-MTDC system is proposed. Firstly, this paper investigates the effect of the operation mode of the DC grid on the switching overvoltage level. Secondly, typical faults and the protection action sequence of various faults are analyzed in detail. The characteristics and laws of various switching overvoltage are deeply studied. Finally, the switching overvoltage of converter station is calculated on the basis of the control and protection system, and the recommended values of the insulation level of converter station equipment for the 500kV MMC-MTDC system with hybrid DC circuit breaker are given.