Integrated boost photovoltaic grid-connected inverter and control method thereof

Abstract

The invention discloses an integrated boost photovoltaic grid-connected inverter and a control method thereof. The inverter comprises a first power switch tube S1, a second power switch tube S2, a third power switch tube S3, a first diode D0, a second diode D1, a third diode D2, an inductor L1, a first capacitor C1 and a second capacitor C2, wherein the inverter comprises a direct current side and an alternating current side, the direct current side comprises an input power supply Vin, the alternating current side comprises a filter, the first power switch tube S1, the second power switch tube S2 and the third power switch tube S3 are respectively provided with a first terminal and a second terminal, the first terminal of the third power switch tube S3 and the second terminal of the second power switch tube S2 are connected with the other end of the alternating current side, and the second terminal of the second power tube switch S1 is connected with one end of the second capacitor C2. According to the inverter, the direct current side and the alternating current side are grounded together, common-mode interference is avoided, leakage current is reduced, the number of the inverters is reduced, the system cost is reduced, the integration degree is improved, and the occupied space of the circuit is small.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to an integrated boost photovoltaic grid-connected inverter and a control method thereof. Background technique [0002] At present, the global energy supply is increasingly tense, and the clean and environmentally friendly solar photovoltaic power generation has been valued by countries all over the world. The inverter is the key interface device in the photovoltaic power generation system. The traditional non-isolated inverter lacks the electrical isolation of the transformer, and the photovoltaic cell has parasitic capacitance to the ground, which is prone to leakage current in the photovoltaic power generation system, resulting in increased losses, electromagnetic interference (EMI), and other problems, reducing the overall performance of the photovoltaic power generation system . [0003] Usually, the output DC voltage of new energy modules such as photovol...

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Problems solved by technology

[0006] The purpose of the present invention is to provide an integrated boost photovoltaic grid-connected inverter and its control method to solve the problems of low boost ratio, high-frequency leakage, complex circuit, large circuit volume, and large loss in the prior art.

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