电工技术学报  2015, Vol. 30 Issue (15): 96-108    DOI:
电力电子及电力传动 |
基于叠加原理的八开关三相逆变器全调制度范围内两种等效PWM算法
刘勇超 ,葛兴来 ,冯晓云
西南交通大学电气工程学院 成都 610031
Two Types of Equivalent PWM Algorithms in the Full Modulation Region for Eight-switch Three-phase Inverter Based on the Superposition Principle
Liu Yongchao, Ge Xinglai ,Feng Xiaoyun
School of Electrical Engineering Southwest Jiaotong University Chengdu 610031 China
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摘要 对八开关三相逆变器(ESTPI)两种基于不同基本电压矢量的全调制度范围空间矢量脉宽调制(SVPWM)算法进行比较研究,在此基础上,为了提高ESTPI直流电压利用率,提出一种基于叠加原理的SVPWM过调制算法,进而得到ESTPI全调制度范围SVPWM算法,该算法根据调制度的大小,将整个ESTPI运行区域划分为线性调制区、过调制模式Ⅰ区和过调制模式Ⅱ区。从调制函数角度出发,基于PWM规则采样法,推导与SVPWM算法等效的载波脉宽调制(CBPWM)算法,并得到了随着调制度的变化,CBPWM算法调制函数的变化规律。仿真和实验结果表明,这两种算法作用下的输出线电压基波幅值与调制度呈线性关系,且最多能将其提高约10.2%。
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刘勇超
葛兴来
冯晓云
关键词 故障重构拓扑八开关三相逆变器空间矢量脉宽调制载波脉宽调制过调制叠加原理调制函数    
Abstract:At first,the comparison study on two space vector pulse width modulation (SVPWM) algorithms for eight-switch three-phase inverter(ESTPI) in the full modulation region based on different basic voltage vectors are carried out.In order to enhance the utilization ratio of the DC-link voltage of ESTPI,a SVPWM algorithm based on the superposition principle in the over-modulation region is proposed.Based on that,a SVPWM algorithm for ESTPI in the full modulation region is obtained.This algorithm divides the operation region of ESTPI into linear region,over-modulation mode I region,and over-modulation mode II region depending on the modulation index.Then,based on PWM regular sampling method,the modulating functions of the equivalent carrier-based pulse width modulation (CBPWM) algorithm of this SVPWM algorithm in the full modulation region are derived.The change rules of the equivalent carrier-based modulating functions are summarized with the modulation index changing afterwards.The simulation and experimental results show that the amplitude of fundamental line voltage is proportional to the modulation index and it can be increased maximumly by about 10.2%,by adopting these two PWM algorithms.
Key wordsPost-fault reconfigured topology    eight-switch three-phase inverter    space vector pulse width modulation    carrier-based pulse width modulation    over-modulation    superposition principle    modulating function   
收稿日期: 2014-12-02      出版日期: 2015-09-08
PACS: TM464  
基金资助:国家自然科学基金-高铁联合基金重点项目(U1134205)和国家自然科学基金(51207131,51277135)资助项目。
作者简介: 刘勇超 男,1991年生,硕士研究生,研究方向为两电平和三电平NPC逆变器单桥臂故障重构拓扑调制与控制策略。葛兴来 男,1979年生,副教授,研究方向为电力牵引交流传动系统控制、故障诊断及稳定性分析。
引用本文:   
刘勇超 ,葛兴来 ,冯晓云. 基于叠加原理的八开关三相逆变器全调制度范围内两种等效PWM算法[J]. 电工技术学报, 2015, 30(15): 96-108. Liu Yongchao, Ge Xinglai ,Feng Xiaoyun. Two Types of Equivalent PWM Algorithms in the Full Modulation Region for Eight-switch Three-phase Inverter Based on the Superposition Principle. Transactions of China Electrotechnical Society, 2015, 30(15): 96-108.
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