摘要
换相失败是传统高压直流输电系统最常见的事件之一。在直流发生换相失败的过程中,直流电压、电流、功率发生剧烈变化对送端电网电压产生冲击。相关研究缺乏直流系统换相失败引起送端电网暂态过电压的定量分析。针对此问题,在直流送端系统等值模型的基础上,考虑换相失败过程中换流器消耗无功功率暂态变化特性,推导了换相失败引起的送端电网过电压的计算公式,从而定量分析了送端电网暂态过电压及其影响因素。结果表明,换相失败引起的暂态过电压与送端交流系统强度、直流稳态传输功率有关。最后,以实际高压直流输电工程为基础,基于Hypersim的高压直流数字物理混合仿真验证了所提方法的准确性和有效性。
Commutation failure is one of the most common events in a traditional high voltage direct current(HVDC)transmission system,under which the DC voltage,current and power change drastically and impact the sending-side grid voltage.At present,the related research lacks a quantitative analysis of transient overvoltage in the sending-side grid caused by the commutation failure of a DC system.To solve this problem,considering the characteristics of reac⁃tive power consumed by the rectifier during the commutation failure process,the analytical expression of overvoltage in the sending-side grid is derived on the basis of the equivalent model of the DC sending-side system.In this way,the transient overvoltage and its influencing factors are analyzed quantitively.Results show that the transient overvoltage caused by commutation failure is associated with the AC sending-side system strength and the steady-state DC transmis⁃sion power.Finally,the accuracy and effectiveness of the proposed method are verified by an HVDC digital-physical hy⁃brid simulation model based on Hypersim.
作者
孙家豪
王笑雪
李光辉
李奎
张兴
SUN Jiahao;WANG Xiaoxue;LI Guanghui;LI Kui;ZHANG Xing(State Key Laboratory of Reliability and Intelligence of Electrical Equipment,Hebei University of Technology,Tianjin 300130,China;Hebei Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability,Hebei University of Technology,Tianjin 300130,China;State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems,China Electric Power Research Institute,Beijing 100192,China)
出处
《电力系统及其自动化学报》
CSCD
北大核心
2020年第12期62-68,共7页
Proceedings of the CSU-EPSA
基金
河北省青年基金资助项目(E2019202146)。
关键词
高压直流
换相失败
暂态过电压
短路比
仿真建模
high voltage direct current
commutation failure
transient overvoltage
short-circuit ratio
simulation model
