面向高压电机驱动的模块化多电平变流器低频控制研究  

Research on Low Frequency Control of Modular Multilevel Converter forHigh Voltage Motor Drive

作　　者：孙勇 饶睿 SUN Yong;RAO Rui(State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210096,China;Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]国网江苏省电力有限公司,江苏南京210096 [2]南京理工大学,江苏南京210094

出　　处：《机械与电子》2023年第8期60-64,70,共6页Machinery & Electronics

基　　金：国家电网有限公司总部管理科技项目(4000-202118066A-0-0-00)。

摘　　要：为了解决模块化多电平变换器(MMC)在低频工况下的子模块电压波动大的问题,提出了一种基于类两电平调制的低频控制方法,大大降低了低频运行下的子模块直流电压纹波。首先在桥臂能量波动基础上分析了MMC子模块电压波动机理,然后引入中频自由控制变量来进行补偿控制,推导了注入的中频电压和电流大小的公式,并详细介绍了控制方法的具体实现方式,最终通过对比实验验证了该方法的可行性和有效性。In order to solve the problem of large voltage fluctuation of sub modules of modular multilevel converter(MMC)in low frequency operation,a low frequency control method based on quasi two level modulation is proposed,which greatly reduces the DC voltage ripple of sub modules in low frequency operation.Firstly,based on the energy fluctuation of the bridge arm,the voltage fluctuation mechanism of the MMC sub module is analyzed,and then the free control variable is introduced to compensate the control.The formula of the injected medium frequency voltage and current is derived,and the specific implementation of the control method is introduced in detail.Finally,the feasibility and effectiveness of the method are verified through comparative experiments.

关 键 词：模块化多电平变流器 低频运行 类两电平调制 高压电机 

分 类 号：TM46[电气工程—电器]