一种单级隔离型Sepic逆变器

摘要

A novel single-stage isolated Sepic inverter is proposed. The proposed inverter only needs three power devices and a high frequency transformer. Its structure is simple and easy to implement. As derived from Sepic DC converter, the proposed inverter is of the ability to buck/boost input voltage and is much suitable for renewable resource generation system with DC link voltage of wide range fluctuation. The circuit structure and operation principle are introduced. One cycle control is applied to realize the closed-loop control. The magnetic integration design scheme of the proposed inverter is presented. Simulation and experiments are performed. The results indicate that the proposed inverter is of excellent dynamic and stable performance.%提出了一种新型单级隔离型 Sepic 逆变器。该逆变器只需三个有源开关和一个高频变压器，结构简单、易于实现。该逆变器由直流 Sepic 变换器扩展而来，因而具有升降压能力，适于直流侧电压宽范围波动的可再生能源发电系统。介绍了所提逆变器的电路结构和工作原理，采用单周期控制实现了系统的闭环控制；给出了该逆变器的磁集成设计方案；在理论分析的基础上，进行了仿真和实验验证。仿真和实验结果表明，该逆变器具有良好的动、静态性能。