期刊论文

中文

中国电机工程学报

0258-8013

2017

37

13

3874-3882

10.13334/j.0258-8013.pcsee.161238

国家自然科学基金项目（61073048）~~；

本校为第一机构

针对含有大规模子模块的模块化多电平换流器(modular multilevel converter,MMC)直流电容电压平衡问题,提出一种基于改进排序的电容电压平衡方法。基于传统排序电压平衡方法中的排序环节要求对桥臂内所有子模块电容电压进行排序,计算延时严重影响电压平衡控制的动态响应。以避免投入组和切除组组内元素排序为目的改进快速排序算法,每趟排序均选择第m个位置的记录作为基准值,通过判断使下一趟排序只在被划分后的一个区域上递归;采用数学归纳法证明改进快速排序算法的时间复杂度为O(n)。考虑MMC子模块电容电压连续两个控制周期变化规律后,提出采用改进的快速排序算法排序之前按照上个控制周期的排...

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...