基于功率解耦的单级隔离型微型逆变器研究

近年来,随着人们对新能源和环境问题的关注,清洁能源越来越多的受到重视,极大地推动了光伏逆变器的发展。微型逆变器以其即插即用、体积小、灵活安全等特点,在智能电网及户用场合得到广泛应用。然而,直流侧电解电容限制了微型逆变器的寿命和功率密度。提出了一种基于功率解耦的单级隔离型微型逆变器拓扑,该拓扑具有处理直流二次脉动功率的能力,直流母线侧可采用薄膜电容,进一步提高了系统寿命。详细分析了该新型拓扑的工作模态,并设计了100 W原理样机以验证其有效性。

Research on Single-stage Isolated Micro-inverter Based on Power Decoupling

In recent years,renewable energy generation systems have great benefits dealing with the environmental challenges,clean energy has attracted wider attentions,which enormously promotes the development of the photovoltaic inverter.Micro-inverters are widely used in smart grids and household applications due to its plug-and-play,small size,flexible and safe features.However,DC side electrolytic capacitors limit the life and power density of the micro-inverter.a single-stage isolated micro-inverter topology based on power decoupling was proposed.This topology was with the ability to handle DC secondary pulsating power.The DC bus side could be used film capacitors to further improve the system life.The working mode of the new topology was analyzed in detail,and a 100 W prototype was designed to verify its effectiveness.