基于准比例谐振控制的模块化多电平矩阵变换器环流抑制策略  

Circulating Current Suppression Strategy of Modular Multilevel MatrixConverter Based on Quasi-Proportional Resonant Control

作　　者：姜亚峰 李仪博 吴秋伟 刘沈全 吴小丹[5] 周前 JIANG Yafeng;LI Yibo;WU Qiuwei;LIU Shenquan;WU Xiaodan;ZHOU Qian(School of Electrical Engineering,Shandong University,Jinan 250061,China;Tsinghua Berkeley Shenzhen Institute,Tsinghua University,Shenzhen 518055,Guangdong,China;Tsinghua Shenzhen International Graduate Institute,Tsinghua University,Shenzhen 518055,Guangdong,China;School of Electrical Engineering,South China University of Technology,Guangzhou 510641,China;NR Electric Co.,Ltd.,Nanjing 211102,China;State Grid Jiangsu Electric Power Co.,Ltd.Research Institute,Nanjing 211103,China)

机构地区：[1]山东大学电气工程学院,济南250061 [2]清华大学清华伯克利深圳学院,广东深圳518055 [3]清华大学清华深圳国际研究生院,广东深圳518055 [4]华南理工大学电力学院,广州510641 [5]南京南瑞继保电气有限公司,南京211102 [6]国网江苏省电力有限公司电力科学研究院,南京211103

出　　处：《上海交通大学学报》2025年第2期242-251,I0005,I0006,共12页Journal of Shanghai Jiaotong University

基　　金：国家电网公司总部科技项目(4000-202218073A-1-1-ZN)。

摘　　要：模块化多电平矩阵变换器(M~3C)是分频输电系统中的核心装置.由于缺乏直流环节,所以不同频率的电气量在M~3C内部直接耦合,导致M~3C内部出现非常复杂的谐波,造成子模块均压困难,影响M~3C的稳定运行.提出一种基于准比例谐振(PR)控制器的闭环控制策略,实现对M~3C内部环流的抑制.首先,研究稳态时子模块电容纹波电压,详细分析子模块纹波电压与开关函数耦合产生谐波电流的机理,推导谐波环流的解析式,指出抑制环流的必要性.然后,针对4种频率成分的谐波环流设计并联的准PR环流抑制器,在抑制环流的同时减少桥臂电流的畸变,保障桥臂间电容电压均衡并且具备良好的动态性能.最后,在MATLAB/Simulink中搭建仿真模型,通过仿真验证控制策略的有效性.Modular multilevel matrix converter(M 3C)is the core device of the fractional frequency transmission system.Due to the lack of direct current link,the electrical quantities of different frequencies are directly coupled inside the M 3C,resulting in a complex harmonic condition,which makes it difficult to balance the capacitor voltage of the sub-module and affects the stable operation of the M 3C.In this paper,a closed-loop control strategy based on quasi-proportional resonance(PR)controller is proposed to suppress the internal circulation of the M 3C.First,the ripple voltage of the sub-module capacitor in steady state is studied.The mechanism of harmonic current generated by the coupling of sub-module ripple voltage and switching function is analyzed in detail.The analytical formula of harmonic circulating current is derived,and the necessity of suppressing the circulating current is pointed out.Then,a parallel quasi-PR circulation suppressor is designed for the harmonic circulation of four frequency components,which reduces the distortion of the bridge arm current while suppressing the circulating current,ensures the capacitor voltage balance between the bridge arms with a good dynamic performance.Finally,a simulation model is built in MATLAB/Simulink and the effectiveness of the control strategy is validated by simulation.

关 键 词：模块化多电平矩阵变换器 分频输电系统 电容纹波电压 准比例谐振控制 环流抑制 

分 类 号：TM461[电气工程—电器] TM464