摘要
根据模块化多电平换流器(MMC)的运行原理,针对传统子模块电容电压排序算法存在器件开关频率高、从而引起开关损耗较大的问题,本文提出一种基于最大电压偏差裕度的均压优化算法。该算法考虑了子模块上一时刻开关投切状态以及各子模块电压之间的差值,可以在保证各子模块电容电压基本一致的前提下,避免IGBT不必要的反复投切,有效降低MMC子模块开关频率,减小开关损耗,从而提高系统运行效率。本文通过在Matlab/Simulink平台上搭建21电平的MMC仿真模型进行了仿真,仿真结果验证了均压优化算法的正确性和有效性。
The traditional capacitor voltage balancing arithmetic results in high switching frequency and high switching losses. In order to solve this problem, this paper studies the operating principle of modular multilevel converter （MMC） and proposes an optimized capacitor voltage balancing algorithm based on maximum voltage deviation margin. This is done by considering the switching status and voltage deviation of submodules, which can reduce the switching frequency of IGBT under satisfying the balance demand, thus reducing switching losses and improving the efficiency of the system. At last, the simulation based on a 21-level three-phase MMC in Matlab/Simulink verifies the validity and effectiveness of the proposed algorithm.
出处
《电气技术》
2017年第9期4-9,共6页
Electrical Engineering
作者简介
曾欢（1994-），男，江西吉安人，同济大学在读硕士研究生，主要研究方向为电力电子技术。
