【摘要】 为了提高高电平MMC均压控制的排序速率,提出一种适用于高电平MMC子模块的电容电压分块均压控制策略。首先根据子模块电容电压最值划分分块区域,由排序的复杂度和均压控制效果确定分块区域的数目,然后根据桥臂电流大小和需投子模块个数,从分块区域内选择相应的子模块投入,最后引入分块区域的重新划分判据以减少计算量。在PSCAD/EMTDC环境下搭建21电平MMC系统仿真模型。仿真结果表明,该控制策略提高了分块区域的利用率,降低了IGBT的开关损耗。更多还原

【Abstract】 A capacitor voltage blocked voltage balancing control strategy applicable to the sub-modules of the high level modular multi-level converter(MMC)is proposed to improve the sequencing rate for voltage balancing control of the high level MMC. The block area is divided according to the maximum or minimum capacitor voltage values of sub-modules. The number of block areas is determined by the sequencing complexity and voltage balancing control effect. The corresponding sub-modules are selected from the block area for devotion according to the bridge arm current intensity and the number of sub-modules that need to be devoted. The repartition criterion of the block area is introduced to reduce the calculation amount. A simulation model of the 21-level MMC system was built in the PSCAD/EMTDC environment. The simulation results show that the control strategy can improve the utilization rate of the block area and reduce the switching loss of the IGBT.更多还原