基于电压反馈VSVPWM三电平中点电位平衡控制  

Three Level Neutral Point Potential Balance Control Based on Voltage Feedback VSVPWM

作　　者：王璐 范波[1] 邱玉林 WANG Lu;FAN Bo;QIU Yulin(School of Information Engineering,Henan University of Science and Technology,Luoyang Henan 471003,China;Citic Heavy Industries Co.,Ltd.,Luoyang Henan 471003,China)

机构地区：[1]河南科技大学信息工程学院,河南洛阳471003 [2]中信重工机械股份有限公司,河南洛阳471003

出　　处：《计算机仿真》2022年第11期118-124,共7页Computer Simulation

基　　金：国家重点研发计划/重点专项项目(2017YFB0306400);国家自然科学基金(U1704157,61473115)。

摘　　要：针对三电平变流器存在中点电位不平衡,VSVPWM(虚拟空间矢量脉宽调制)算法中开关损耗比较大,冗余小矢量幅值大小不相等问题,提出了一种基于中点电位电压反馈的VSVPWM方法。方法通过电位不平衡时小矢量的幅度变化的不同,重新划分3个空间矢量扇区构建虚拟矢量,并在系统中加入电容电压反馈和引入系数k来选择一个适合的小矢量进行作用,减少了开关的损耗和实现精确控制平衡的目的。为验证控制算法的可行性,进行了仿真和实验,结果表明:所提出的方法可以有效地保持中点电位电压平衡,并消除整个调制指标范围内电压的低频振荡,具有良好的动态性能。In order to solve the problems of unbalanced neutral point potential,large switching loss and small redundant vector amplitude in the VSVPWM algorithm,a VSVPWM modulation method based on neutral point potential voltage feedback is proposed.This method divides three space vector sectors to construct virtual vectors according to the different amplitude changes of the small vector when the potential is unbalanced and adds capacitor voltage feedback and coefficient k to select a suitable small vector to act on the system,which reduces the switching loss and achieves the purpose of accurate control of balance.In order to verify the feasibility of the control algorithm,the simulation and experiment results show that the proposed method can effectively maintain the neutral point potential voltage balance and eliminate the low-frequency oscillation of the voltage in the whole modulation index range,and has good dynamic performance.

关 键 词：中点箝位式三电平变流器 中点电位不平衡 虚拟空间矢量脉宽调制 电压反馈 

分 类 号：TM464[电气工程—电器]