摘要
换相失败是高压直流输电系统(HVDC)的常见故障。为保证电力系统正常运行,对换相失败的分析尤为重要。针对此问题,考虑越前触发角的变化,推导出了含直流电流的表达式作为换相失败判据。逆变侧交流系统发生三相接地故障时,当关断角减小到换相失败临界值,根据HVDC相关运行参数计算出临界直流电流值,并分析了不同故障条件下的临界直流电流特性。在PSCAD/EMTDC电磁暂态仿真软件中建立仿真模型,验证了所提判据的有效性。
Commuting failure is a common fault in HVDC transmission system.In order to ensure the normal operation of power system,the analysis of commuting failure is very important.To solve this problem,considering the change of the forward trigger angle,the expression of DC current are derived as the commutation failure criterion when three-phase ground fault occurs in the inverter AC system.When the firing angle is reduced to the critical of the commuting failure,the critical DC current is calculated according to the steady-state operating parameters of HVDC,and the characteristics of critical DC current under different fault conditions are analyzed.The simulation is based on PSCAD/EMTDC electromagnetic transient simulation software,and the correctness of the proposed method is verified.
作者
王婷
苏玉香
沈晓群
王翔
WANG Ting;SU Yu-xiang;SHEN Xiao-qun;WANG Xiang(School of Marine Engineering Equipments,Zhejiang Ocean University,Zhoushan 316022,China;School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)
出处
《自动化与仪表》
2021年第12期1-4,共4页
Automation & Instrumentation
基金
浙江省自然科学基金青年基金项目(LQ18E070004)
2020浙江省大学生科技创新活动计划暨新苗人才计划项目(2020R411018)。
关键词
高压直流输电
换相失败
越前触发角
临界直流电流
high voltage direct current(HVDC)
commutation failure
forward trigger angle
critical DC current
