Photovoltaic inverter also known as power regulator, according to the use of the inverter in the photovoltaic power generation system can be divided into independent power supply and grid-connected two kinds. According to waveform modulation mode, it can be divided into square wave inverter, step wave inverter, sine wave inverter and combined three-phase inverter. For the inverter used in grid-connected system, it can be divided into transformer type inverter and transformer type inverter according to the transformer

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