模块化多电平变流器电容电压波动抑制策略  

Capacitor Voltage Fluctuation Suppression Strategy for Modular Multilevel Converter

作　　者：孙开元 陈坤 岑海凤 张国政 SUN Kai-yuan;CHEN Kun;CEN Hai-feng;ZHANG Guo-zheng(Guangdong Power Grid Co.,Ltd.,Guangzhou Power Supply Bureau,Guangzhou 510000,China;Tiangong University,Tianjin Key Laboratory of Intelligent Control of Electrical Equipment,Tianjin 300387,China)

机构地区：[1]广东电网有限责任公司广州供电局,广东广州510000 [2]天津工业大学天津市电气装备智能控制重点实验室,天津300387

出　　处：《电力电子技术》2025年第2期5-7,12,共4页Power Electronics

基　　金：国家自然科学基金(51807140)。

摘　　要：循环电流控制策略是降低模块化多电平变流器(MMC)子模块电容电压波动的有效手段。现有循环电流控制策略中常常忽略桥臂电感电压的影响,这将导致模型误差,从而影响循环电流控制效果。本文提出了一种考虑桥臂电感电压的循环电流控制策略以抑制电容电压的波动。首先建立含有桥臂电感电压的循环电流数学模型,并利用输出电流与输出电压瞬时值确定循环电流参考值,然后通过2N+1调制的冗余开关状态将系统内部的循环电流调节至其参考值。最后通过实验验证了所提策略的有效性。Circulating current control strategy is an effective means to reduce the capacitor voltage fluctuation in the submodule of modular multilevel converter(MMC).The existing circulating current control strategies often ignore the effect of the bridge arm inductor voltage,which will lead to errors in their theoretical models and thus affect the ef-fectiveness of the circulating current control.A circulating current control strategy considering the bridge arm inductor voltage is proposed to suppress the fluctuation of capacitor voltage.Firstly,a mathematical model of the circulating current containing the bridge arm inductor voltage is established,and the reference value of the circulating current is determined by using the instantaneous values of the output current and output voltage,and then the circulating current inside the system is regulated to its reference value by the redundant switching state of 2N+1 modulation.Final-ly,the effectiveness of the proposed strategy is verified through experiments.

关 键 词：模块化多电平变流器 电容电压波动 循环电流控制 

分 类 号：TM46[电气工程—电器]