基于映射策略的MMC电容电压平衡控制算法

MMC Capacitor Voltage Balance Control Algorithm Based on Mapping Strategy

本文提出了一种新的应用于模块化多电平换流器(MMC)电容电压(CV)平衡的策略。电容电压平衡是MMC应用中面临的主要问题,通常采用全桥臂控制方法解决。采用此方法,根据子模块电压对其排序是必不可少的。然而,随着子模块的增长,这些算法的执行时间和计算工作量将迅速增加。本文提出了一种新的思路,通过使用映射策略,直接根据测量的电容电压将子模块存储在排序列表中。避免使用排序算法,使执行时间和计算工作量显著减少。

In this paper,a kind of new strategy for balancing the capacitor voltage(CV)for modular multilevel converter(MMC) is proposed.The balance of capacitive voltage is the main problem faced in the MMC applications and it is usually solved by adopting a global arm control approach.For using such method,a sorted list of the sub-module(SM) in accordance with their capacitor voltages is necessary.However,with the increase of sub model,the execution time and the computational efforts of these algorithms increase very rapidly.A novel idea is proposed in this paper by using a mapping strategy that directly stores in a ranked list the SM according to the measured CV.Avoidance use of sorting algorithms leads to a considerable reduction of the execution time as well as the computational efforts.