摘要
为保证模块化多电平换流器的正常运行(modular multilevel converter,MMC),必须预先对子模块中的储能电容器充电。在分析MMC拓扑及运行机理的基础上,针对单端MMC及其在高压直流输电(high voltage direct current,HVDC)领域的应用,提出了一种适合工程应用的两阶段预充电方案。仅利用自身交流系统,就可将电容电压快速提升至额定值。同时为避免充电过程中的过电流,对定直流电压控制进行了改进。通过MATLAB仿真,验证了所提方案的正确性。
To ensure normal operation of a modular multilevel converter （MMC）, the storage capacitors in sub modules （SM） must be pre-charged voltage direct current （HVDC） study to elevate the voltage of ~ Considering the characteristic of MMC and its application to high transmission systems, a two-stage pre-charging scheme was presented in this the capacitors to rated value only using its AC system. And the DC voltage control was improved to prevent over current during the pre-charging MATLAB verifies the effectiveness of the proposed pre-charging scheme. period. Simulation with the software
出处
《高压电器》
CAS
CSCD
北大核心
2014年第4期103-107,共5页
High Voltage Apparatus
关键词
模块多电平换流器
高压直流输电
预充电
modular multilevel converter
high voltage direct current
pre-charging
