• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

ELECTRIC POWER CONSTRUCTION ›› 2022, Vol. 43 ›› Issue (6): 66-74.doi: 10.12204/j.issn.1000-7229.2022.06.007

• Core Equipment of DC Power Grid ?Hosted by Associate Professor SONG Qiang, Associate Professor YU Zhanqing and Associate Professor ZHAO Biao? • Previous Articles     Next Articles

Mechanism of STATCOM Assisting Transient Voltage under Commutation Failure at Weak Sending End System and Its Optimization Strategy

LIANG Zhuohang(), SHI Chun, LI Yansong(), LIU Jun   

  1. School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China
  • Received:2021-10-21 Online:2022-06-01 Published:2022-05-31
  • Contact: LI Yansong E-mail:liyansong811@126.com

Abstract:

With the large-scale access of new energy, the power grid presents the characteristics of strong DC system and weak AC system. When commutation failure occurs in HVDC transmission system, transient overvoltage will appear in weak sending end system. Since STATCOM responds to the change of grid voltage through the command of control link, the lag of its control link will lead to the enhancement of transient overvoltage by STATCOM. Firstly, in view of this phenomenon, this paper analyzes the generation mechanism of AC transient overvoltage in weak sending end system under commutation failure. Secondly, by analyzing the frequency response characteristics, theoretical derivation of STATCOM response delay time is given. Finally, an optimization strategy based on damped switching is proposed to suppress STATCOM’s increasing effect on overvoltage response, and the effectiveness of the optimization strategy is verified by simulation. This work is supported by National Natural Science Foundation of China (No. 51277066) and State Grid Corporation of China Research Program (No. 5102-201956301A-0-0-00).

Key words: STATCOM, commutation failure, HVDC, transient overvoltage

CLC Number: