混合级联特高压直流输电系统旁通对过负荷保护优化  

Optimization of bypass pair overload protection in hybrid cascade UHVDC transmission system

作　　者：唐俊[1] 赵文强[1] 吕彦北 姜崇学 邹强[1] TANG Jun;ZHAO Wenqiang;LÜYanbei;JIANG Chongxue;ZOU Qiang(NR Electric Co.,Ltd,Nanjing 211102)

机构地区：[1]南京南瑞继保电气有限公司,南京211102

出　　处：《电气技术》2022年第1期84-88,94,共6页Electrical Engineering

摘　　要：为解决混合级联特高压直流输电系统中存在的旁通对过负荷保护误动问题,本文分析研究故障后的电流回路和保护误动机理,提出采用换流器高、低压侧实测电流的保护判据。针对站间通信中断下执行极闭锁时逆变站旁通对过负荷保护动作的情况,提出逆变站电网换相换流器(LCC)合旁通开关(BPS)的策略,并研究相应的保护定值整定方法。实时数字仿真试验表明,提出的方案简单可行,避免了旁通对过负荷保护误动,提高了直流输电系统的可靠性。In order to solve the misoperation problem of bypass pair overload protection in hybrid cascade UHVDC transmission system,the current loop and protection misoperation mechanism after fault are analyzed and studied,and a protection criterion based on the measured currents at the high and low voltage sides of the converter is proposed.Aiming at the action of bypass pair overload protection in inverter station when pole bloking is performed under the interruption of station communication,the strategy of line commutated converter(LCC)closing bypass switch(BPS)in inverter station is proposed,and the corresponding protection setting method is studied.Real time digital simulation(RTDS)test shows that the proposed scheme is simple and feasible,which avoids the misoperation of bypass pair overload protection and improves the reliability of UHVDC transmission system.

关 键 词：混合级联 高压直流输电(HVDC) 电压源换流器(VSC) 电网换相换流器(LCC) 旁通对过负荷保护 

分 类 号：TM721.1[电气工程—电力系统及自动化]