低频模式下模块化多电平变流器的调制策略研究  

Research on modulation strategy of modular multilevel converter under low frequency operation

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

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

出　　处：《自动化与仪器仪表》2022年第12期102-106,共5页Automation & Instrumentation

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

摘　　要：模块化多电平变换器(Modular Multilevel Converter, MMC)具有冗余性好、可拓展性强等优点,已经在输电领域广泛应用。但是MMC由数量众多的子模块构成,子模块电容电压的控制对于MMC的正常工作十分重要,而当MMC工作于低频工况时,子模块电容的电压波动更为严重。提出了应用于MMC的类两电平调制方法,并量化分析了类两电平调制下得电容参数选择,最终通过仿真研究验证了该方法的正确性和有效性。Modular Multilevel Converter(MMC) has been widely used in power transmission because of its advantages of good redundancy and extensibility. However, MMC is composed of many sub-modules, and the control of sub-module capacitor voltage is very important for the normal work of MMC, and when MMC works at low frequency, the fluctuation of sub-module capacitor voltage is more serious. In this paper, a two-level modulation method for MMC is proposed, and the selection of capacitance parameters under the two-level modulation is analyzed quantitatively. Finally, the correctness and effectiveness of this method are verified through simulation research.

关 键 词：模块化多电平变流器 低频运行 类两电平调制 电容设计 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]