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基于定等效直流输入电阻的低压限流控制器优化控制策略
刘勃1, 陈中1, 杨凯1, 路晨1, 严俊1, 庄卫金2
1.东南大学 电气工程学院,江苏 南京 210096;2.中国电力科学研究院,江苏 南京 210003
摘要:
低压限流控制器(VDCOL)是抑制基于电网换相换流器的高压直流输电(LCC-HVDC)系统后续换相失败的重要控制环节,通过分析LCC-HVDC系统换流器换相过程,提出一种基于等效直流输入电阻的VDCOL优化方案评价指标以及一种基于定等效直流输入电阻的VDCOL优化控制策略。基于CIGRE HVDC标准测试模型对故障期间不同类型的VDCOL优化方案进行仿真测试以验证所提评价指标的合理性和所提控制策略的有效性,仿真结果表明:故障期间等效直流输入电阻与关断角呈正相关;采用所提控制策略后等效直流输入电阻能够尽快恢复并保持在1.0 p. u.附近;同时所提控制策略可以有效抑制LCC-HVDC系统后续换相失败。
关键词:  高压直流输电系统  换相失败  评价指标  低压限流控制器  优化
DOI:10.16081/j.epae.202202031
分类号:TM721.1
基金项目:国家重点研发计划项目(2016YFB0900602)
Optimal control strategy of voltage dependent current order limiter based on constant equivalent DC input resistance
LIU Bo1, CHEN Zhong1, YANG Kai1, LU Chen1, YAN Jun1, ZHUANG Weijin2
1.School of Electrical Engineering, Southeast University, Nanjing 210096, China;2.China Electric Power Research Institute, Nanjing 210003, China
Abstract:
VDCOL(Voltage Dependent Current Order Limiter) is an important control link to suppress the subsequent commutation failure of LCC-HVDC(Line-Commutated-Converter based High Voltage Direct Current) system. By analyzing the converter commutation process of LCC-HVDC system, an evaluation index of VDCOL optimal schemes based on equivalent DC input resistance and an optimal control strategy of VDCOL based on constant equivalent DC input resistance are proposed. Based on the CIGRE HVDC standard test model, different types of VDCOL optimal schemes during fault period is simulated and tested to verify the rationality of the proposed evaluation index and the effectiveness of the proposed control strategy. The simulative results show that the equivalent DC input resistance is positively correlated with the turn-off angle during fault period. After adopting the proposed control strategy, the equivalent DC input resistance can be restored as soon as possible and keep at around 1.0 p. u.. At the same time, the proposed control strategy can effectively suppress the subsequent commutation failure of LCC-HVDC system.
Key words:  HVDC power transmission system  commutation failure  evaluation index  VDCOL  optimization

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