连接弱交流电网的VSC-HVDC失稳机理及判据研究

doi:10.19595/j.cnki.1000-6753.tces.181143

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Abstract To analyze the influence of the interaction between vector control loop and the weak AC grid on system stability, the linearized transfer function models under different operating modes of VSC were built. By analyzing the distributions of zeros and poles in open-loop transfer function and closed loop transfer function, the instability analytical criterion was proposed. Meanwhile, the relationship of the power and current in the simplified system of VSC was studied, which revealed the instability mechanism of VSC-HVDC connected to the weak AC system and obtained the physical meaning of the instability criterion. Finally, VSC-HVDC connected to the weak AC system model was built in PSCAD/EMTDC and the theoretical research was verified by simulation.

Key words： VSC-HVDC vector control loop weak AC power grid linearized transfer function models instability

Received: 01 July 2018 Published: 26 September 2019

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TM721.1

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	Shao Bingbing
	Zhao Shuqiang
	Gao Benfeng
	Song Siheng
	Li Ren

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Shao Bingbing,Zhao Shuqiang,Gao Benfeng等. Instability Mechanism and Criterion Analysis of VSC-HVDC Connected to the Weak AC Power Grid[J]. Transactions of China Electrotechnical Society, 2019, 34(18): 3884-3896.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.181143 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I18/3884

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