期刊论文

An Improved Capacitor Voltage Balancing Method for MMC Based on Radix Sort

中文

电力科学与工程

1672-0792

2017

33

4

13-19

10.3969/j.ISSN.1672-0792.2017.04.003

湖南省重点实验室开发基金项目；

本校为第一机构

基于排序的子模块电容电压均压方法是目前应用于大容量模块化多电平换流器(Modular Multilevel Converter,MMC)型高压直流输电系统的主流均压方式,存在排序运算量大、开关频率高等缺陷,带来较大的硬件投入,降低MMC运行可靠性.针对上述问题,引入时间复杂度更低的基数排序,结合MMC运行特点,去除冗余关键字,降低时间复杂度,在此基础上,根据控制器所需投入子模块数m,优化子模块全排序为寻求m个子模块,去除冗余运算,同时提出重排序判据,使MMC控制器选择性地排序,减少排序频度,增大原有触发脉冲维持时间,降低开关频率.最后,在MATLAB/SIMULINK搭建21电平MMC模型,仿真结果表明,改进基数MMC均压算法能在较...

The Sort-based sub-module capacitor voltage method is the mainstream method used in superpower MMC-based on high voltage direct current (HVDC) transmission system, which has some deficiencies such as large amount of sorting-computation and high switching frequency.The existing deficiencies bring greater hardware investment while decrease the MMC reliability.To solve the issue above, an improved algorithm based on the lower time complexity radix sort is proposed.First, by analyzing the characteristics of MMC operation, redundant keywords are removed to reduce the time complexity, and on this ba...