基于不平衡无功与触发角误差补偿的直流输电系统送端交流暂态过电压控制方法  

A suppression method for sending-end transient overvoltage of LCC-HVDC based on the compensation of unbalanced reactive power and firing angle error

作　　者：欧阳金鑫[1] 陶睿 潘馨钰 肖超 郭春义 庞茗予 OUYANG Jinxin;TAO Rui;PAN Xinyu;XIAO Chao;GUO Chunyi;PANG Mingyu(State Key Laboratory of Power Transmission Equipment Technology(Chongqing University),Chongqing 400044,China;Electric Power Research Institute,State Grid Henan Electric Power Company,Zhengzhou 450052,China;State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China)

机构地区：[1]输变电装备技术全国重点实验室(重庆大学),重庆400044 [2]国网河南省电力公司电力科学研究院,河南郑州450052 [3]新能源电力系统国家重点实验室(华北电力大学),北京102206

出　　处：《电力系统保护与控制》2024年第24期53-63,共11页Power System Protection and Control

基　　金：国家重点研发计划项目资助(2023YFB2406802);河南省电力公司科技项目资助(521702230008)。

摘　　要：基于电网换相型变换器的高压直流输电系统(line commuted converter based high voltage direct current,LCC-HVDC)易发生换相失败,引起整流站交流母线暂态过电压。针对交流暂态过电压威胁送端系统安全运行的问题,提出LCC-HVDC送端交流暂态过电压控制方法。首先,通过分析换相失败下整流站暂态过电压特性,解析了整流站锁相偏差对触发角控制的影响,量化了整流站锁相偏差对整流站交流暂态过电压的影响。然后,基于送受端无功功率平衡关系,提出了补偿整流站不平衡无功的直流电流计算方法。接着,提出了补偿触发角动态误差的触发角指令值计算方法。在此基础上,提出了基于不平衡无功与触发角误差补偿的直流输电系统送端交流暂态过电压控制方法。最后,通过仿真算例证明所提方法对LCC-HVDC送端交流暂态过电压具有显著抑制效果。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.

关 键 词：LCC-HVDC 暂态过电压 锁相偏差 直流电流控制 触发角控制 

分 类 号：TM721.1[电气工程—电力系统及自动化]