摘要
在交直流互联电网中,受端交流电网故障很有可能会引发直流系统换相失败。基于动态相量理论和开关函数方法,建立换相失败下直流系统注入交流电网的等值工频电流的模型。结合直流系统换相过程的机理,分别分析了临界换相失败、轻微换相失败、较严重换相失败和严重换相失败这4种典型换相失败场景下的换流桥电流开关函数表达式,以及相应的故障等值工频电流的暂态特性,通过分析表明该等值工频电流的暂态特性有别于纯交流系统。最后,利用国际大电网会议的高压直流输电标准化测试系统,验证了理论分析的正确性。
In the AC-DC power grid,the fault of the AC power grid in the receiving end is likely to cause the DC system commutation failure.Based on the dynamic phasor theory and the switch function method,a model of equivalent power frequency current injected into the AC grid by a DC system under commutation failure is established.Combined with the commutation process of DC system,four typical commutation bridge current switching function expressions are analyzed respectively,including critical commutation failure,minor commutation failure,more serious commutation failure and serious commutation failure,and the transient fault characteristics of equivalent fault current.The analysis shows that the transient characteristics of the equivalent power frequency current are different from the pure AC system.Finally,high voltage direct current transmission standardized test system of CIGRE is used to verify the correctness of the theoretical analysis.
作者
王童辉
贾科
毕天姝
赵其娟
冯涛
李伟
WANG Tonghui;JIA Ke;BI Tianshu;ZHAO Qijuan;FENG Tao;LI Wei(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;China Electric Power Research Institute,Beijing 100192,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2018年第23期78-85,共8页
Automation of Electric Power Systems
基金
国家重点研发计划资助项目(2016YFB0900203)
国家自然科学基金资助项目(51725702)
国家电网公司科技项目(JB71-15-049).
关键词
高压直流输电
换相失败
动态相量理论
开关函数
暂态特性
high voltage direct current transmission
commutation failure
dynamic phasor theory
switch function
transient characteristics
