摘要
在高压直流输电系统控制环节中,低压限流控制器的静态恢复特性和获取补偿电压的方法会导致连续换相失败。为减小连续换相失败发生的概率,本文在引入直流电流变化率改变低压限流控制器获取补偿电压的基础上,通过改变低压限流控制器的数学模型,提出了基于直流电流变化率控制的变斜率低压限流控制器控制策略。最后使用电磁暂态仿真软件中的国际大电网会议高压直流标准模型进行仿真,仿真结果表明,本文提出的控制策略在发生接地故障时能有效地抑制连续换相失败,从而优化了故障恢复特性。
In the control link of a HVDC transmission system,the static recovery characteristics of the voltage dependent current order limiter(VDCOL)and the method of obtaining compensation voltage affect the continuous commutation failure.In order to reduce the probability of continuous commutation failure,the mathematical model adopted by VDCOL is changed based on the concept of the rate of change of DC current to obtain compensation voltage,and a variable-slope VDCOL control strategy based on the rate of change of DC current is proposed in this paper.Finally,the CIGRE HVDC standard model of PSCAD is used for simulations,and results show that the proposed control strategy can effectively suppress continuous commutation failure under grounding fault and optimize the fault recovery characteristics.
作者
王立舒
宋鹤
李天舒
李忠连
常城铭
WANG Lishu;SONG He;LI Tianshu;LI Zhonglian;CHANG Chengming(School of Electrical and Information,Northeast Agricultural University,Harbin 150030,China)
出处
《电力系统及其自动化学报》
CSCD
北大核心
2021年第7期80-87,共8页
Proceedings of the CSU-EPSA
基金
教育部春晖计划资助项目(Z2012074)
黑龙江省教育厅科技课题资助项目(12521038)。
关键词
高压直流输电
低压限流控制器
直流电流变化率
变斜率
连续换相失败
HVDC transmission
voltage dependent current order limiter(VDCOL)
rate of change of DC current
variable slope
continuous commutation failure
