摘要
通过分析电压源换流器换流过程,得到电压源换流器的简化电路。换流器的上、下桥臂互补通断时,简化电路与原电路等效。简化电路不仅减少了支路数,而且可简化支路方程,因此,基于简化电路的快速仿真方法可减少电磁暂态仿真计算量,节省仿真用时。该快速电磁暂态仿真方法的缺点是不能模拟开关死区和故障闭锁过程。在PSCAD/EMTDC仿真平台上通过3个仿真实例对基于简化电路的快速电磁暂态仿真方法进行了具体评估。结果表明,对2电平换流器而言,快速方法加速效果一般,实用价值不大;对高级联数模块化多电平换流器而言,快速方法加速效果很好,能显著节省仿真用时,实用价值较大。
The commutation process of VSC（Voltage Source Converter） is analyzed and its simplified circuit model is derived,which is effective when the complementary switching mode of its upper and lower legs is adopted in system simulation. As the branch number of simplified circuit model is reduced and its branch equation is simplified,its fast electro-magnetic transient simulation needs less computation time,though the switching dead zone and the converter BLOCK-state could not be simulated. The performance of fast electro-magnetic transient simulation is evaluated through three cases simulated with PSCAD/EMTD,and results show that,the computation time is effectively shortened for MMC（Modular Multilevel Converter） with multiple（more than two） levels.
出处
《电力自动化设备》
EI
CSCD
北大核心
2012年第6期36-40,共5页
Electric Power Automation Equipment
基金
国家高技术研究发展计划(863计划)(2012AA050205
2012AA051704)~~
关键词
换流器
电磁暂态仿真
模块化多电平换流器
电压源换流器
简化电路
仿真
electric converters
electro-magnetic transient simulation
modular multilevel converter
voltage source converter
simplified circuit
computer simulation
