准Z源逆变器的小波调制方法  

A wavelet modulation method for a quasi-Z-source inverter

作　　者：李志军[1] 张珈玮[1] 王娟[1] 奚文霞 张仔坤 张川博 

机构地区：[1]河北工业大学控制科学与工程学院,天津300130

出　　处：《工程科学学报》2017年第12期1881-1887,共7页Chinese Journal of Engineering

基　　金：河北省科技支撑计划项目"智能电网中的若干关键技术研究"(15212105D)

摘　　要：提出一种适用于准Z源逆变器的小波调制策略,通过改变传统小波调制采样点位置,增大直通占空比的调节范围.将直通矢量分为两等份,分别插入采样时刻两端,使其不需额外增加开关频率,且理论上可获得最大恒定直通占空比.对所提小波调制与两种传统准Z源逆变器调制策略进行比较,对准Z源逆变器不同调制策略的升压能力、效率、谐波、调制比进行了系统的理论分析,最后通过仿真对所提方法进行验证.理论与仿真均表明,所提小波调制具有谐波小、电压利用率高、升压能力强等优点.A wavelet modulation strategy applied to a quasi-Z-source inverter was proposed. The regulating range of the shootthrough duty ratio could be increased by changing the locations of the sampling points set using traditional wavelet-modulation. The proposed modulation strategy divided the shoot-through zero vector into two portions,which were then individually inserted into both ends of the sampling time. Under the proposed strategy,the quasi-Z-source inverter could obtain a theoretical maximum constant shoot-through duty ratio without any extra switching frequencies. In addition,the proposed strategy was compared with traditional modulation strategies used in quasi-Z-source inverters. The boosting capacity,efficiency,harmonic and modulation ratio of the different modulation strategies for quasi-Z-source inverter were analyzed thoroughly. Finally,the performance of the proposed method was verified by simulation. Both the simulation results and theory verify that the strategy can reduce harmonic,increase voltage utilization rate,and enhance the boosting capacity.

关 键 词：准Z源逆变器 小波调制 总谐波畸变率 电压利用率 

分 类 号：TM464[电气工程—电器]