基于氮化镓器件的单级式Buck-Boost逆变器的分析与参数优化设计

Analysis and Parameters Optimization for Buck-Boost Converter Adopting Gan Devices

为解决小微功率等级的光伏发电场合微逆变器功率密度较低、体积较大、不能离网运行的问题,分析多级式Buck-Boost逆变器工作原理,通过变换电路形式得出一种单级式Buck-Boost逆变器拓扑结构,并对其工作模态进行分析,优化电容、电感的设计方法,进而得出基于电流模式的逆变器控制策略。经仿真验证了单级式Buck-Boost逆变器的有效性,为下一步进行隔离式逆变器设计奠定了基础。

This article proposed a single stage Buck - Boost inverter which is equipped with Gan devices. The in- verter has features of high power density, low volume, and could be run under the stand - alone mode. The single stage Buck - Boost inverter has been derived from a multi - stage inverter by transforming and removing unnecessary components. The working modes have also been concerned, as well as optimized parameters of passive components and working frequency by using small signal analysis on state space. Simulation results have been verified the valid- ity of the proposed design method.