极弱受端交流系统下LCC-MMC型混合直流输电系统的附加频率-电压阻尼控制

doi:10.19595/j.cnki.1000-6753.tces.190525

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Abstract In this paper, a novel supplementary frequency-voltage damping control (SFVDC) is proposed to suppress the small-signal instability of line commutated converter-modular multilevel converter (LCC-MMC) hybrid HVDC system under extremely weak receiving AC grid. The proposed control approach generates supplementary DC voltage damping component based on the angular frequency deviation from the phase-locked loop (PLL) of MMC station, and the component is then introduced into the outer loop constant DC voltage controller. The proposed control is used to suppress the small-signal instability of the LCC-MMC hybrid HVDC system connected to extremely weak receiving AC grid, so as to improve the small-signal stability of the system. The results show that the proposed SFVDC method can effectively suppress the small-signal instability under extremely weak receiving AC grid and reduce the requirements of the receiving AC grid strength for stable operation. In addition, the good dynamic responses of the system were also obtained under large power disturbance and single-phase to ground fault at receiving AC bus.

Key words： Line commutated converter (LCC) modular multilevel converter (MMC) hybrid HVDC system supplementary frequency-voltage damping control (SFVDC) weak receiving AC grid small-signal stability

Received: 06 May 2019 Published: 07 April 2020

PACS:	TM712
	TM722

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	Wang Yanning
	Guo Chunyi
	Zheng Anran
	Yin Zihan

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Wang Yanning,Guo Chunyi,Zheng Anran等. Supplementary Frequency-Voltage Damping Control for LCC-MMC Hybrid HVDC System Connected to Extremely Weak Receiving AC Grid[J]. Transactions of China Electrotechnical Society, 2020, 35(7): 1509-1520.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190525 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I7/1509

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