中国电机工程学报2017，Vol.37Issue(13)：3874-3882,9.DOI:10.13334/j.0258-8013.pcsee.161238
模块化多电平换流器电容电压改进排序平衡方法
A Modified-sorting Balancing Method of Capacitor Voltage for Modular Multilevel Converter
摘要
Abstract
Aiming at the DC capacitor voltage balancing problem of a modular multilevel converter (MMC) with large-scale sub-modules,a novel balancing method based on modified sorting was proposed.The sorting link of the capacitor voltage balancing method based on traditional sorting required sorting all the capacitor voltages,whose computation delay seriously influenced the dynamic response of the voltage balancing control.The quick sort algorithm was modified by avoiding sorting the elements in on-group and off-group,selecting the record of the m-th position as the reference for each rank and with only one region for the next rank by judging.The time complexity of the modified quick sort algorithm was proved to be O(n) by mathematical induction.After considering the MMC sub-modules' capacitor voltages variation law in continuous two control cycle,it is presented that the comparison times can be further reduced if the capacitor voltages are arranged according to the results in the last control cycle.Finally,the time complexity of the modified quick sort algorithm is verified by the computer random experiment,and the 401 level MMC-HVDC simulation model is built to verify the feasibility and effectiveness of the proposed voltage balancing method.关键词
模块化多电平换流器/电容电压平衡/快速排序算法/时间复杂度Key words
modular multilevel converter (MMC)/capacitor voltage balance/quick sort algorithm/time complexity分类
信息技术与安全科学引用本文复制引用
粟时平,魏新伟,牛鼎,刘桂英,郑和斌,贾学瑞..模块化多电平换流器电容电压改进排序平衡方法[J].中国电机工程学报,2017,37(13):3874-3882,9.基金项目
国家自然科学基金项目(61073048).Project Supported by National Natural Science Foundation of China (61073048). （61073048）
