基于预测控制算法的三电平中点电压平衡控制  

Neutral-point Control of Three-level NPC Inverter Based on the Predictive Control Algorithm

作　　者：赵霞[1] 耿乙文[1] 梁改革[1] 李小强[1] 屠伟[1] 

机构地区：[1]中国矿业大学信息与电气工程学院,江苏徐州221008

出　　处：《电气传动》2013年第4期50-52,56,共4页Electric Drive

摘　　要：传统的NPC型三电平变换器中点电压不平衡控制算法,是基于当前不平衡电压,通过控制冗余小矢量来实现的。该算法不能精确控制中点电压。采用一种新型预测控制算法对中点电压进行平衡控制,引入中点电压评估函数,其综合当前中点电压误差及预测中点电压误差,选择最优的开关作用顺序,从而达到精确控制中点电压的目的。仿真分析和实验结果验证了该算法的可行性和平衡控制的有效性。In tradition, the control algorithm of the unbalanced neutral-point voltage for a three- level neutral point clamped inverter is based on the current unbalanced voltage and the redundant small vectors.This algorithm can not accurately control the unbalanced neutral-point voltage.A predictive control algorithm was proposed,which introduced an unbalanced evaluation function, took both the current unbalanced voltage and the predictive unbalanced voltage into consideration, chose the optimum switching sequence to control the unbalanced neutral- point voltage accurately. Simulation and experimental results prove the feasibility of the algorithm and the effectiveness of the algorithm.

关 键 词：三电平整流器 空间矢量脉宽调制 中点电压平衡 开关作用顺序 

分 类 号：TM461[电气工程—电器]