基于自适应协调触发量的UHVDC分层接入系统同时换相失败抑制策略  

Commutation Failure Suppression Strategy in UHVDC Hierarchical Connection System Based on Adaptive Coordinated Firing Quantity

作　　者：夏莉涵 刘健 林圣[1] 赵静波 XIA Lihan;LIU Jian;LIN Sheng;ZHAO Jingbo(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,Sichuan Province,China;Jiangsu Electric Power Test and Research Co.,Ltd.,Nanjing 211103,Jiangsu Province,China;Electric Power Research Institute,State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211103,Jiangsu Province,China)

机构地区：[1]西南交通大学电气工程学院,四川省成都市611756 [2]江苏省电力试验研究有限公司,江苏省南京市211103 [3]国网江苏省电力有限公司电力科学研究院,江苏省南京市211103

出　　处：《电网技术》2024年第9期3903-3911,I0094,共10页Power System Technology

基　　金：国家自然科学基金项目(51977183);江苏省自然科学基金项目(BK20221197)。

摘　　要：特高压直流分层接入方式下,非故障层换相失败预测控制存在启动滞后、输出的提前触发量偏小等问题,系统面临同时换相失败风险。为解决该问题,提出一种基于自适应协调触发量的特高压直流分层接入方式下换相失败抑制策略,将故障层换相失败预测控制输出的触发角调节量引入到非故障层,从而使非故障层换相失败预测控制提前触发。同时,引入联络线两端电压变化量来动态跟踪故障演变过程,以获得自适应协调触发量。在PSCAD/EMTDC中搭建电磁暂态仿真模型进行仿真验证,结果表明,所提抑制策略能够有效降低分层接入方式下高低端换流阀同时换相失败风险。Under the hierarchical connection mode of ultra-high voltage direct current(UHVDC),commutation failure prevention control(CFPREV)of the non-faulty layer has problems such as start-up lag and advanced firing quantity is too small,so the system faces the risk of simultaneous commutation failure.To solve this problem,a commutation failure suppression strategy based on adaptive coordination firing quantity is proposed in the UHVDC hierarchical connection system,and the firing angle adjustment of CFPREV output of the faulty layer is introduced into the non-faulty layer.Therefore,the CFPREV of the non-faulty layer is fired in advance.Meanwhile,the voltage variation at both ends of the tie-line is introduced to dynamically track the fault evolution process and obtain the adaptive coordination firing quantity.An electromagnetic transient simulation model is built in PSCAD/EMTDC to verify the proposed suppression strategy.The results show that the proposed suppression strategy can effectively reduce the risk of simultaneous commutation failure of the high and low-end converter valves in the hierarchical connection mode.

关 键 词：特高压直流输电 分层接入 同时换相失败 换相失败预测控制 自适应协调触发量 

分 类 号：TM721[电气工程—电力系统及自动化]