摘要
换相失败是直流系统常见故障,可能引发直流闭锁等严重后果。借助电磁暂态仿真程序PSCAD/EMTDC,确定了±660kV银东直流双极运行方式下的换相失败临界电压,然后将该值用于机电暂态仿真程序PSS/E中,分析了山东电网三相短路故障对±660kV银东直流的影响,并对预防换相失败的措施进行了探讨。该方法兼顾了大规模电网直流换相失败研究的精度和效率,可为山东电网安全稳定措施的制定提供更有效的依据。
Commutation failures are common faults for DC links,which may lead to serious consequences such as DC blocks.Firstly,the threshold commutation failure voltage of ± 660 kV Yindong-Jiaodong HVDC line in bipolar operating mode is determined by PSCAD/EMTDC.Then,the threshold voltage is used in PSS/E,and conditions of ± 660 kV Yindong-Jiaodong HVDC line under three-phase short-circuit faults in Shandong Power Grid of China are analyzed.Finally,some measures for preventing commutation failures are discussed.The simulation method gives consideration to both the accuracy and efficiency of DC commutation failures in large-scale power systems.And it can help Shandong Power Grid make more effective security and stability measures.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2011年第12期134-139,共6页
Power System Protection and Control
基金
国家电网公司重点科技项目(SGKJ[2009])
关键词
直流输电
换相失败
电磁暂态
机电暂态
DC transmission
commutation failure
electromagnetic transient
electromechanical transient
