High-gain single-phase single-stage transformer-free photovoltaic inverter and control method thereof

The invention discloses a high-gain single-phase single-stage transformer-free photovoltaic inverter and a control method thereof. The inverter comprises first to fourth inductors, first to third switch tubes, first to fourth capacitors and a load resistor. According to the method, only two switch tubes are switched on at the same time, and an output voltage gain of the inverter is ensured to realize an inversion process. The topologic structure is simple, fewer switching devices are included, and the output voltage is high. A switching signal generation circuit is simple in structure, and canbe realized via an analog circuit. 本发明公开了种高增益单相单级无变压器型光伏逆变器及其控制方法，包括第电感、第二电感、第三电感、第四电感、第开关管、第二开关管、第三开关管、第电容、第二电容、第三电容、第四电容和负载电阻；其控制方法是通过本发明的调制保证同时刻只有两个开关管导通，同时保证逆变器输出电压增益以及实现逆变过程。本发明的拓扑具有结构简单，开关器件少，同时输出电压高的特点。其控制方法开关信号生成电路结构简单，可采用模拟电路实现。