Novel two-stage alternating-current photovoltaic module

Abstract

The invention discloses a two-stage alternating-current photovoltaic module based on a DC-DC (direct-current / direct-current) converter with high voltage gain and a single-phase hybrid clamping type three-level inverter, which comprises the DC-DC converter at a front stage and the single-phase hybrid clamping type three-level inverter at a rear stage, wherein the DC-DC converter consists of a switch tube M1, a switch tube M2, an inductor L1 and an inductor L2, the input end of the DC-DC converter is connected with a photovoltaic cell, one output end of the DC-DC converter is connected with a diode D1, and a capacitor C0 is connected in parallel between one output end and the other output end of the DC-DC converter; the DC-DC converter adopts a multi-stage pulse sequence mode to control output voltage; the single-phase hybrid clamping type three-level inverter comprises a single-phase hybrid clamping type circuit and an inverter, the single-phase hybrid clamping type circuit consists of a diode D2, a diode D3 and a capacitor C3, wherein the diode D2 and the diode D3 are connected in series, the capacitor C3 is bridged at the two ends of the series circuit formed by the diode D2 and the diode D3, the inverter consists of an IGBT (insulated gate bipolar translator) Q1, an IGBT Q2, an IGBT Q3, an IGBT Q4, a capacitor C1 and a capacitor C2, and the output end of the inverter outputs alternating current via an inductor L3; and the single-phase hybrid clamping type circuit adopts a carrier phase shift control mode to control the inverter. The fluctuation of voltage can be reduced, the output power can be improved, the method is simple, and the module is easy to design.

Description

technical field [0001] The invention relates to a new two-stage AC photovoltaic module based on a DC-DC converter with high voltage gain and a single-phase mixed clamp type three-level inverter. Background technique [0002] In recent years, with the increasingly serious energy crisis and environmental problems, the utilization of renewable energy such as solar energy, wind energy, geothermal energy and tidal energy has attracted more and more attention. Among them, solar energy has broad application prospects due to its advantages such as wide range, abundant resources, no pollution, and no noise. With the development of society, people's demand for electricity is increasing rapidly. In this case, solar power generation system emerges as the times require, and people's research on solar photovoltaic power generation is also increasing. As the name implies, photovoltaic power generation is a technology that converts solar energy into electrical energy through the photovolta...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a new two-stage DC-DC converter based on high voltage gain and single-phase hybrid clamp type three-level inverter in order to solve the problems of DC side capacitor voltage balance and system leakage current. Type AC Photovoltaic Module

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