模块化多电平变换器三次谐波注入调制策略研究  

Research on the Third Harmonic Injection Modulation Strategy for MMC

作　　者：彭学林 徐阳旭 张梦 PENG Xuelin;XU Yangxu;ZHANG Meng(State Grid Hubei Wuhan Power Supply Company,Wuhan 430050,China)

机构地区：[1]国网湖北省电力有限公司武汉供电公司,湖北武汉430050

出　　处：《电工材料》2023年第4期52-56,共5页Electrical Engineering Materials

摘　　要：相比于正弦调制策略,三次谐波注入调制策略可有效提高直流侧电压利用率、提高模块化多电平变换器(MMC)的容量,但输出电压、电流引入了高次谐波分量。子模块电容电压的波动过大将导致电容容量增加、成本增加,为此研究了高次谐波分量对MMC暂态特性的影响,尤其是对子模块电容电压波动的影响,并在PSCAD中搭建了仿真模型,仿真结果表明:采用三次谐波注入调制策略将在输出电压、输出电流中引入高次谐波分量,提升了MMC的传输容量,而且抑制了子模块电容电压波动,提升了MMC的工作特性。Compared with the sinusoidal modulation strategy,the three-harmonic injection modulation strategy can effectively increase the DC side voltage utilization and the capacity of the modular multilevel converter(MMC),but the output voltage and output current contains higher harmonic components.The capacitor capacity and cost will increase,when the capacitor voltage fluctuation of submodules increases.Therefore,the influence of higher harmonic components on the transient characteristics of MMC is studied,especially the influence on the capacitor voltage fluctuation of submodules.Finally,a simulation model is built in PSCAD.The simulation results show that the transmission capacity of MMC is improved by introducing higher harmonic components into the output voltage and output current using the third harmonic injection modulation strategy,and the voltage fluctuation of the submodule capacitor is suppressed.Thus,the working characteristics of MMC is improved.

关 键 词：模块化多电平变换器 三次谐波注入调制 子模块电容电压 

分 类 号：TM464[电气工程—电器]