一种带功率解耦的Flyback微型逆变器研究

摘要

In single⁃phase photovoltaic ( PV) grid inverter, the differences between input and output instantaneous power require large electrolytic capacitors, but the lifetime of electrolytic capacitors is relatively short, which se⁃verely limits the life span of the inverter. To solve this problem, power decoupling unit is added in the inverter so that electrolytic capacitors are replaced with long⁃life film capacitors. This paper studies the parameter calculation and loss analysis of a flyback inverter with power decoupling, then verifies the feasibility of the topology by experi⁃ment.%单相光伏并网逆变器中由于输入输出瞬时功率存在差异，通常需要并联很大的电解电容来平衡这部分功率，由于电解电容寿命短，严重限制了逆变器的寿命，所以在电路中加入功率解耦单元，用长寿命的薄膜电容代替电解电容。本文研究一种带功率解耦的Flyback微型逆变器，并对其进行参数计算和损耗分析，推导出了通用的计算公式，最后通过仿真和实验验证了该拓扑的可行性。