单相单级升降压逆变器的拓扑分析与比较  

Topological Analysis and Comparison on Single-phase Single-stage Buck-boost Inverter

作　　者：章勇高[1] 康淦明 李洋[1] 王妍[1] 常凯旋[1] 

机构地区：[1]华东交通大学电气与电子工程学院,江西南昌330013

出　　处：《华东交通大学学报》2014年第1期77-82,共6页Journal of East China Jiaotong University

基　　金：江西省工业科技支撑项目(20122BBE500046)

摘　　要：传统能源的快速消耗使新能源得以快速发展,其中以光伏发电尤为引人瞩目。作为光伏发电系统能量转换与控制核心的光伏逆变器,是将光伏阵列输出的直流电转换成交流电并注入到电网的电力装置。其拓扑结构的性能不仅决定着整个系统的发电效率,而且大大影响总体系统成本。作为快速发展的分布式光伏发电系统,单相单级升降压逆变器具有成本低、效率高、结构简单的优点,成为主要的光伏逆变器。论文以5种典型的隔离型和非隔离型的单相单级升降压逆变器为研究对象,从拓扑结构、是否并网运行以及主要性能指标等方面进行了比较分析,说明了逆变器设计应综合考虑开关器件个数、高频工作器件数、工作对称性、EMI(电磁干扰)以及系统效率等因素,指出未来单相单级升降压逆变器的低EMI干扰、低成本、高效率以及高可靠性的发展趋势。Rapid consumption of traditional energy enables rapid development of new energy,and photovoltaic power generation is particularly striking. Photovoltaic（PV）inverter,as the converting and controlling core in photovoltaic generation system,is an important power device for converting DC of photovoltaic array into AC current and then injecting into power line. The topological structure of PV inverter not only decides the efficien-cy of the whole generation system,but also greatly affects the overall system costs. With the rapid development of distributed photovoltaic generation system,single-phase single-stage buck-boost inverter has the advantages of low cost,high efficiency,simple structure,and becomes the main PV inverter. This paper studies the typi-cal five different non-isolated and isolated single-phase single-stage buck-boost inverters and compares their to-pology structure. It is concluded that the design of PV inverter should consider power device number,high fre-quency device number,the symmetry of system operation,EMI interference and system efficiency,and the fu-ture development of single-phase single-stage buck-boost inverter may aim at lower EMI interference,lower cost,higher efficiency and higher reliability.

关 键 词：升降压逆变器 拓扑结构 低成本 高可靠性 

分 类 号：TM615[电气工程—电力系统及自动化]