基于虚拟空间矢量的中点电压平衡控制  

Neutral-point Voltage Balance Control Based on the Virtual Space Vector

作　　者：刘纪畅[1] 袁庆庆[1] 戴鹏[1] 伍小杰[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：《电力电子技术》2013年第5期15-17,共3页Power Electronics

基　　金：国家自然科学基金项目(51077124);江苏省2012年度普通高校研究生科研创新计划项目(CXZZ120930)~~

摘　　要：基于传统算法的二极管箝位型三电平逆变器,在高调制度及低功率因数下存在中点电压不可控区域,中点电压中存在3倍基波频率的低频纹波信号,严重时将导致系统无法正常工作。针对此问题,在分析该不可控区域存在原因的基础上,研究了虚拟空间矢量与平衡因子法相结合的十段式对称模式,有效实现了中点电压的全范围可控,并能消除因电容不平衡等因素造成的中点电压偏移,具有较好的鲁棒性。仿真及实验验证了该方案的正确性与有效性。The neutral-point voltage balance control for neutral-point-clamped three-level inverters based on traditional algorithm has limitations when modulation degree is high and power factor is low, there is a low frequency ripple of the neutral-point voltage,which can cause the system doesn＇t work when serious.In order to solve this problem,the reasons of the limitations are analyzed, the ten stage centered mode which combines virtual space vector and balance factor is studied.This method can realize the full range control of neutral-point voltage effectively, eliminate the voltage excursion caused by capacitance unbalance, and has good robustness.The Matlab simulation and experimental resuits are given to verify the validity of the method.

关 键 词：逆变器 中点电压 不可控区域 虚拟空间矢量 

分 类 号：TM464[电气工程—电器]