A suppression method for sending-end transient overvoltage of LCC-HVDC based on the compensation of unbalanced reactive power and firing angle error
DOI：10.19783/j.cnki.pspc.240384
Key Words:LCC-HVDC  transient overvoltage  phase locking error  DC current control  firing angle control
Author NameAffiliation
OUYANG Jinxin1 1. State Key Laboratory of Power Transmission Equipment Technology (Chongqing University), Chongqing 400044, China
2. Electric Power Research Institute, State Grid Henan Electric Power Company, Zhengzhou 450052, China
3. State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Beijing 102206, China 
TAO Rui11 1. State Key Laboratory of Power Transmission Equipment Technology (Chongqing University), Chongqing 400044, China
2. Electric Power Research Institute, State Grid Henan Electric Power Company, Zhengzhou 450052, China
3. State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Beijing 102206, China 
PAN Xinyu1 1. State Key Laboratory of Power Transmission Equipment Technology (Chongqing University), Chongqing 400044, China
2. Electric Power Research Institute, State Grid Henan Electric Power Company, Zhengzhou 450052, China
3. State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Beijing 102206, China 
XIAO Chao2 1. State Key Laboratory of Power Transmission Equipment Technology (Chongqing University), Chongqing 400044, China
2. Electric Power Research Institute, State Grid Henan Electric Power Company, Zhengzhou 450052, China
3. State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Beijing 102206, China 
GUO Chunyi3 1. State Key Laboratory of Power Transmission Equipment Technology (Chongqing University), Chongqing 400044, China
2. Electric Power Research Institute, State Grid Henan Electric Power Company, Zhengzhou 450052, China
3. State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Beijing 102206, China 
PANG Mingyu1 1. State Key Laboratory of Power Transmission Equipment Technology (Chongqing University), Chongqing 400044, China
2. Electric Power Research Institute, State Grid Henan Electric Power Company, Zhengzhou 450052, China
3. 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:Line-commuted converter-based high voltage direct current (LCC-HVDC) is prone to commutation failure, causing transient overvoltage at the AC bus of the rectifier station. Given that AC transient overvoltage can threaten the safe operation of the sending-end system, an AC transient overvoltage control method of the LCC-HVDC sending-end system is proposed. First, the influence of the phase locking error of the rectifier station on the firing angle control is analyzed by analyzing the characteristics of the transient overvoltage during commutation failure, and the influence of the phase locking error on the AC transient overvoltage of the rectifier station is quantified. Then, the threshold DC current calculation method for compensating the unbalanced reactive power of the rectifier station is proposed based on the reactive balance relationship between the sending and receiving ends. Next, a calculation method of firing angle command value for compensating the dynamic error of firing angle is proposed. The control method for sending-end AC transient overvoltage based on the compensation of unbalanced reactive power and firing angle error is proposed. Finally, simulation cases demonstrate that the AC transient overvoltage of LCC-HVDC sending-end system can be effectively suppressed by the proposed method.
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