基于比例重复控制的MMC-SST子模块电容纹波电压抑制策略  

Capacitor ripple voltage suppression strategy based on proportional repetitive control for an MMC-SST submodule

作　　者：王要强[1,2] 贾显益 赖锦木 陈天锦 吕忠涛 梁军 WANG Yaoqiang;JIA Xianyi;LAI Jinmu;CHEN Tianjin;LÜZhongtao;LIANG Jun(School of Electrical and Information Engineering,Zhengzhou University,Zhengzhou 450001,China;Henan Engineering Research Center of Power Electronics and Power Systems,Zhengzhou 450001,China;XJ Power Co.,Ltd.,Xuchang 461000,China;Henan Key Laboratory of Intelligent Charging Technology,Xuchang 461000,China;State Grid Hulunbuir Power Supply Company,Hulunbuir 021000,China;School of Engineering,Cardiff University,Cardiff CF243AA,UK)

机构地区：[1]郑州大学电气与信息工程学院,河南郑州450001 [2]河南省电力电子与电力系统工程技术研究中心,河南郑州450001 [3]许继电源有限公司,河南许昌461000 [4]河南省智能充电技术重点实验室,河南许昌461000 [5]国网呼伦贝尔供电公司,内蒙古呼伦贝尔021000 [6]卡迪夫大学工程学院,英国卡迪夫CF243AA

出　　处：《电力系统保护与控制》2024年第15期46-57,共12页Power System Protection and Control

基　　金：国家自然科学基金项目资助(52307148);中央引导地方科技发展资金项目资助(2022ZY0134)。

摘　　要：基于模块化多电平变换器的固态变压器(modular multilevel converter based solid state transformer,MMC-SST)是实现交直流混合配电网柔性互联及能量多向流动的关键装备。针对固态变压器输入级MMC子模块电容纹波电压过大,导致装置的体积和成本增加的问题,提出一种基于比例重复控制的MMC-SST改进纹波电压抑制策略。首先利用基于比例重复控制的电容电压闭环得到调整后的功率移相角。然后,通过双有源桥变换器将子模块电容纹波功率传递到低压直流母线,从而有效抑制MMC子模块的各频次纹波电压,达到减小电容值的目的。最后,仿真结果表明在网侧电压对称或不对称工况下,基于比例重复控制的MMC-SST子模块电容纹波电压抑制策略均具有良好的纹波电压抑制能力。The modular multilevel converter based solid-state transformer(MMC-SST)is a crucial piece of equipment for enabling flexible interconnection and multi-directional energy flow in hybrid AC/DC distribution networks.There is a problem of excessive capacitor ripple voltage in the input stage MMC submodule leading to an increase in device size and cost.Thus an improved ripple voltage suppression strategy based on proportional repetitive control(PRC)for the MMC-SST is proposed.First,the adjusted phase shift angle of power is obtained using a capacitor voltage closed-loop based on PRC.Then,the ripple power of the submodule capacitor is transmitted to the low-voltage DC bus through a dual active bridge converter(DAB),effectively suppressing the ripple voltage of the MMC submodule at various frequencies and achieving the goal of reducing the capacitance value.Finally,simulation shows that MMC-SST submodule capacitor ripple voltage suppression strategy based on PRC has good ripple voltage suppression ability in conditions of symmetrical or asymmetrical grid side voltage.

关 键 词：固态变压器 模块化多电平变换器 电容纹波抑制 波动功率传递 比例重复控制 桥臂电流控制 

分 类 号：TM40[电气工程—电器]