单相光伏并网微型逆变器设计  

Design of Single-phase Photovoltaic Grid-connected Microinverter

作　　者：汲德明 任一峰 李昕 JI Deming;REN Yifeng;LI Xin(Zhejiang Envertech（ShanghaiS）Corporation Limited,Shanghai 201100,China;School of Electrical and Control Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]浙江恩沃新能源科技(上海)有限公司,上海市201100 [2]中北大学电气与控制工程学院,太原市030051

出　　处：《建筑电气》2018年第10期45-49,共5页Building Electricity

基　　金：中北大学研究生科技立项项目;项目名称:非隔离双向充放电储能装置设计;项目编号:20171473

摘　　要：设计一种适用于单个光伏组件的光伏并网微型逆变器,拓扑结构主要包括交错并联反激变换器、全桥反转电路和LC滤波电路。分析反激逆变器的工作原理和实现条件;采用数字信号控制器实现交错并联反激逆变器的软开关控制,可减小功率器件开关损耗,提高逆变器电能转换效率;改进的变步长扰动观察法,解决跟踪速度与控制精度之间的矛盾。通过样机实验验证设计的单级式光伏并网微型逆变器具有体积小、输出谐波含量低、功率密度高和电磁兼容性好等优点。A photovoltaic（ PV） grid-connected microinverter suitable for a single PV module and the topological structure mainly consists of interleaved flyback converter, full-bridge inversion circuit and LC filter circuit. The working principle and realization conditions of flyback converter is analyzed; the digital signal controller is adopted to realize soft switching control of the interleaved flyback inverter, reduce the switching loss of power devices and improve the conversion efficiency of electrical energy of inverter;the improved perturbation and observation（ P O）method based on variable step size is employed to resolve the conflict between tracking velocity and control precision. The prototype test is conducted to verify that the single-stage grid-connected PV microinverter has the following advantages： small volume, low output harmonic content, high power density and good electromagnetic compatibility（EMC）, etc.

关 键 词：分布式发电 光伏组件 光伏并网逆变器 反激变换器 全桥反转电路 LC滤波电路 数字信号控制器 最大功率点跟踪 

分 类 号：TM464[电气工程—电器]