MMC阀塔水路对子模块静态均压影响分析

Analysis of MMC Valve Tower Waterway on Static Voltage Balancing of Submodule

模块化多电平换流器(MMC)预充电和阀端交直流电压试验都有静态均压过程,MMC子模块自均压,不投入主动均压策略。在静态均压过程中,发现MMC阀塔不同位置子模块的电容电压两极分化明显,严重影响子模块的正常工作。此处通过引入阀塔水路相关参数,分析了MMC阀塔水路对子模块静态均压的影响机理,建立MMC阀塔仿真模型,对影响子模块静态均压的阀塔水路因素进行了仿真分析,并开展试验,测试了阀塔水路对子模块静态均压的影响情况,仿真结果和试验结果验证了阀塔水路对子模块静态均压有较大影响。

The modular multilevel converter(MMC)pre-charging and the valve AC/DC voltage test have static pressure equalization process and the MMC submodule is self-equalizing without putting in the active equalization strategy.In the static pressure balancing process,it is found that the capacitance voltage of the submodule at different positions of the MMC valve tower is obviously polarized which seriously affects the normal operation of the submodule.By introducing a valve tower water related parameters,the influence mechanism of the MMC valve tower water module static pressure is analyzed,MMC valve tower simulation model is set up,the sub module static equalizing valve tower water factor influence has carried on the simulation analysis and to carried out the test.The valve tower effect of static pressure in the water for module is tested,the simulation results and test results verify the pair valve tower water module has a great influence on static pressure.