Transactions of China Electrotechnical Society  2020, Vol. 35 Issue (7): 1509-1520    DOI: 10.19595/j.cnki.1000-6753.tces.190525
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Supplementary Frequency-Voltage Damping Control for LCC-MMC Hybrid HVDC System Connected to Extremely Weak Receiving AC Grid
Wang Yanning, Guo Chunyi, Zheng Anran, Yin Zihan
State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China

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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
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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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