基于改进排序算法的模块化多电平换流器子模块电容电压均衡控制策略研究  

Research on the capacitor voltage balancing control strategy of MMC sub-module based on improved sorting algorithm

作　　者：岳有军 樊亚振 赵辉 王红君 Yue Youjun;Fan Yazhen;Zhao Hui;Wang Hongjun(Tianjin Key Laboratory of Control Theory and Application for Complex Systems,School of Electrical and Electronic Engineering,Tianjin University of Technology,Tianjin 300384,China;School of Engineering and Technology,Tianjin Agricultural University,Tianjin 300392,China)

机构地区：[1]天津理工大学电气电子工程学院天津市复杂系统控制理论与应用重点实验室,天津300384 [2]天津农学院工程技术学院,天津300392

出　　处：《电测与仪表》2023年第8期81-84,共4页Electrical Measurement & Instrumentation

摘　　要：传统基于模块化多电平换流器的柔性直流输电系统在运行时,存在子模块电容电压均衡运算量大和子模块开关频率高的问题,据此,文中提出了一种基于快速排序算法和改进插入排序算法相结合的电容均压控制策略,通过逐次降低待排元素的数量减少计算量。在此基础上,提出一种改进保持因子的插入方法,进一步减少计算量与开关频率。在Matlab/simulink搭建31电平MMC模型。仿真结果表明,基于快速排序算法和改进插入排序算法相结合的电容电压均衡策略能够在较好维持电容电压均衡的基础上,有效降低计算量。The conventional flexible DC power transmission based on a modular multilevel converter(MMC)has a problem that a large amount of calculation and a high switching frequency of the sub-module are required for a capacitor voltage equalization strategy of a sub-module during operation.On this basis,a capacitor voltage equalization control strategy based on a combination of fast sorting algorithm and improved insertion sorting algorithm is proposed in this paper.The proposed method reduces the amount of calculation by successively reducing the number of elements to be sorted.Based on this,an improved retention factor insertion method is proposed to further reduce the amount of calculation and switching frequency.Finally,a 31-level MMC model is built in Matlab/Simulink.The simulation results show that the capacitor voltage equalization strategy based on the combination of fast sorting algorithm and improved insertion sorting algorithm can effectively reduce the amount of calculations on the basis of better maintaining capacitor voltage balance.

关 键 词：电容均压 快速排序算法 改进插入排序算法 保持因子 

分 类 号：TM464[电气工程—电器]