模块化多电平变流器模块电压纹波抑制策略及应用  

Strategy and Application of Reducing Capacitor Voltage Ripples in Modular Multilevel Converters

作　　者：李金科[1] 金新民[1] 吴学智[1] 张冀川[1] 武文 

机构地区：[1]北京交通大学国家能源主动配电网技术研发中心,北京市海淀区100044 [2]北京电动车辆协同创新中心,北京市海淀区100044

出　　处：《中国电机工程学报》2016年第7期1892-1899,共8页Proceedings of the CSEE

基　　金：国家能源应用技术研究及工程示范项目(NY20150302)~~

摘　　要：降低子模块电容电压波动可以减少模块化多电平变流器系统成本、延长运行寿命。首先利用数值计算方法分析传统环流抑制策略对纹波抑制的原因,再通过模块瞬时功率波动表征子模块波动状态,以功率波动最低的目标计算出特定的环流量控制最优解来抑制模块电容波动。再根据计算出的电流瞬时值表达式,分析不同调制比及功率因数角对抑制纹波效果的影响。最后通过Matlab仿真系统及RT-Lab半实物样机平台在载波移相及最近电平逼近两种调制方式下对纹波抑制策略进行验证,分析了功率因数对抑制效果的影响,比较了传统环流抑制及瞬时电流注入对电容纹波的效果,验证其在特定工况下对两种调制方法的适用性。System cost and operation life can be improved by reducing the capacitors ripples in modular multilevel converters（MMC）. The reason of traditional circulating current suppression strategy to reduce the capacitor fluctuation was analyzed by numeric calculation. The instantaneous power fluctuations of submodules were expressed as capacitor voltages fluctuations. According to the relationship between the voltage fluctuations and the circulating currents, the optical circulating current to reduce the power fluctuations was calculated. Ripple suppression effects were analyzed by changing modulation ratio and power factor angle. Finally, the ripple suppression strategy was verified by utilizing Matlab simulation and RT-Lab hardware-in-the-loop platform. The effects by power factor angle were tested by simulations. The feasibility and application of carrier phase shifting modulation and nearest level modulation methods were discussed by simulations and experiments.

关 键 词：模块化多电平变流器 电压纹波 电流瞬时值 调制策略 

分 类 号：TM46[电气工程—电器]