交错并联反激式准单级光伏并网微逆变器

An Interleaved Parallel Flyback Quasi Single Stage Photovoltaic Grid-connected Micro Inverter

独立光伏组件的微型逆变器能有效克服传统光伏系统存在的阴影问题。详尽介绍了某型准单级式交错并联微逆变器的设计、分析及其控制策略。该微型逆变器基于高频环节逆变技术,有效实现了初、次级电气隔离,解决了漏电流问题;采用有源箝位技术吸收漏感能量,实现了开关管的零电压开关(ZVS);采用变步长的扰动观察法实现最大功率点跟踪(MPPT),输入电压前馈方法可解决准单级式微逆母线电压崩溃问题。220 W样机实验验证了该方案及控制策略的可行性,整机MPPT效率为99.5%,最高效率达到95%。

Micro inverter for a single PV module could overcome the traditional photovoltaie systems partial mask issue. This paper presents a detail design,analysis and control method of a micro inverter.Based on high frequency link technique,galvanic isolation is achieved without leakage current issue.Active clamp circuit recycles leakage inductor energy that helps zero voltage switch （ZVS） transition of the switches.The maximum power point tracking （MPPT） could be realized with varying step method.And DC bus collapse problem of the quasi single stage system is fixed with input voltage feed-forward strategy.220 W prototype experimental results verify the presented solution with 99.5% MPPT efficiency and 95% maximum efficiency.