T型三电平并网变流器的中点电压不平衡控制分析

摘要

为了对T型三电平中点电压不平衡进行控制,本文研究了中点电压不平衡的产生原理,并提出了一种在T型三电平并网变流器原有调制策略中加入均压算法的解决方案. 为了对这一平衡算法进行了验证,本文设计了一台基于TMS320F28335芯片的电池储能T型三电平功率转换系统.实际应用表明,该中点电压平衡算法是可行和有效的,满足了设计的要求.%In order to control the midpoint voltage unbalance for three-level T-Type converter , this paper studies the principle of the midpoint voltage unbalance, and we come up with a program which use a control algroithm in the original modulation strategy for three-level T-Type grid converter. In order to verify the control algroithm, we design a three-level T-Type PCS for battery storage based on TMS320F28335. As a result, the control algroithm for midpoint voltage unbalance is feasible and effective , and it can meet the design requirements.