摘要
提出了一种模块化多电平换流器(module multilevel converter,MMC)子模块电容电压预测均衡控制的混合控制方法。根据子模块工作状态和换流器桥臂电流大小,得到下一动作周期子模块电容电压的预测值;以预测的电容电压绝对误差限值作为电压偏差量判据,得到下一动作周期的子模块投切方案。该方法保证了子模块电容电压的均衡性,同时有效降低了功率器件的开关频率。在PSCAD/EMTDC上构建了11电平MMC系统,仿真结果验证了所提方法的有效性。
A hybrid control method for balance control of the sub-module capacitor voltage based on multi-level converter module（MMC）is proposed.According to state of the sub module and current of the converter bridge,the predictive value of the sub-modules capacitor voltage in the next action cycle is obtained.Taking the predictive absolute error limit of the capacitor voltage as the voltage deviation criterion,the sub-modules switching on/off scheme for the next action cycle is obtained.Proposed method can guarantee the balance of sub-modules capacitor voltage as well as the low switching frequency.In the end,11-level MMC system is built in the PSCAD/EMTDC,and the simulation results verify the effectiveness of the proposed method.
作者
杜佳豹
辛业春
DU Jiabao XIN Yechun(School of Electrical Engineering, Northeast Dianli University, Jilin 132012, China)
出处
《现代电力》
北大核心
2017年第5期38-43,共6页
Modern Electric Power
基金
国家电网公司科技发展计划项目(NEDU20150002)
吉林省省级经济结构战略调制引导资金专项项目(2015Y080)
