双降压全桥并网逆变器

A Dual-buck Full-bridge Grid-connected Inverter

提出一种双降压全桥并网逆变器。该逆变器采用滞环电流控制和单极性调制方式。与双极性调制相比,减小了输出滤波器的体积和重量。独立续流二极管代替开关管的体二极管续流,减小了二极管的反向恢复损耗。一半功率管只在半个工频周期内高频开关,其它功率管为工频且零电流开关,因此,减小了开关损耗。阐述该逆变器的工作原理。仿真和实验结果验证了理论分析,并符合IEEE929-2000标准要求。

This paper proposed a dual-Buck full-bridge grid-connected inverter.Hysteresis current control and uniploar modulation were adopted.Thus,compared with the bipolar modulation,the volume and weight of the output filter can be decreased.The freewheeling current flowed through the independent diodes instead of the body diodes of the switches,so reverse recovery losses of diodes can be reduced.Half of the power devices operated in high frequency at each half-line cycle,and the others switched at grid period with zero-current switching（ZCS）,therefore,the switching losses can be decreased.The operating principle was provided.Finally,simulation and experimental results verify the theoretical analysis and satisfy the IEEE Std.929-2 000.