基于DZSI光伏发电系统的SVPWAM策略研究  

Research on SVPWAM Strategy of Photovoltaic Generation System Based on DZSI

作　　者：程启明[1] 徐聪[2] 程尹曼 黄伟[1] 郭凯[1] 

机构地区：[1]上海电力学院自动化工程学院,上海200090 [2]国网上海市电力公司检修公司,上海200063 [3]上海电力公司市北供电分公司,上海200041

出　　处：《高电压技术》2017年第1期122-130,共9页High Voltage Engineering

基　　金：国家自然科学基金(61304134;61573239);上海市重点科技攻关计划(14110500700);上海市电站自动化技术重点实验室(13DZ2273800);上海市自然科学基金(13ZR1417800)~~

摘　　要：Z源逆变器已开始应用于分布式光伏发电系统中,但传统的Z源逆变器存在升压能力有限、输入电流不连续和启动冲击等问题。采用一种新型的二极管辅助延展型Z源逆变器结构,它能够有效解决传统Z源逆变器的不足。同时,提出了一种基于Z源拓扑的新型调制策略?空间矢量脉冲宽度幅值调制(SVPWAM)策略,它通过消除每个扇区的零矢量,且在每个扇区仅在具有开关动作的单相桥臂插入直通零矢量,从而能够大大降低开关频率。软件仿真和实验结果都表明该调制策略相比于SVPWM调制,它能够更有效地降低逆变器开关损耗和谐波含量,并提高电压利用率。Z source inverter （ZSI） has been applied in the distributed photovoltaic power generation system, but the tra- ditional Z source inverter has problems of the limited boost voltage capacity, the discontinuous input current, and the impact of starting. Consequently, we adopted a new topology----extension-type diode ZSI （DZSI） to solve the problems of traditional Z source inverter. At the same time, we proposed a new modulation strategy--space vector pulse width ampli- tude modulation （SVPWAM） based on Z source topology, which could reduce the switching frequency by eliminating the zero vector of each sector, and could insert the straight through zero vector into a single phase bridge-arm with switching operation in each sector. The software simulation and experimental results show that the modulation strategy is more ef- fective than the SVPWM modulation, it can effectively reduce the inverter switching losses and the output voltage harmonics, and improve the voltage utilization ratio.

关 键 词：二极管辅助延展型Z源逆变器 空间矢量脉冲宽度幅值调制 光伏发电系统 单级式逆变器 最大功率点跟踪 升压能力 加权总谐波失真 

分 类 号：TM464[电气工程—电器] TM615