Micro-inverter with photovoltaic-side decoupling circuit and operating method thereof

Abstract

The invention discloses a micro-inverter with a photovoltaic-side decoupling circuit and an operating method of the micro-inverter with the photovoltaic-side decoupling circuit. A power decoupling circuit is connected between a photovoltaic device solar panel and a transformer. An inverter circuit is connected with the power decoupling circuit through the transformer. The power decoupling circuit is composed of power devices and , an energy storage inductor , diodes , and and capacitors , and . The inverter circuit is composed of power devices and , diodes and , a capacitor, an inductor and a load . The power coupling circuit enables the working voltage of a DC bus to be far higher than the output voltage of a photovoltaic device so that the working voltage of the energy storage capacitor can be obviously increased, and the capacity of a decoupling capacitor of a system can be decreased; consequently, a long-lived thin-film capacitor can be adopted to replace an electrolytic capacitor, the service life of the micro-inverter can be prolonged, and the size of the inverter is effectively reduced; the power decoupling circuit and a flyback converter are combined to carry out control, and consequently grid-connected photovoltaic power generation is achieved.

Description

technical field [0001] The invention relates to a micro-inverter topology and control strategy applied to a single-phase grid-connected photovoltaic power generation system, and belongs to a grid-connected inverter and a control method for grid-connected current. Background technique [0002] In remote areas without electricity, the population is scattered and conventional energy resources are scarce. The use of existing power supply methods not only costs a lot, but also has poor power quality at the end of the grid. The adoption of renewable energy technology is an effective means to solve the problem of power supply for the population in these areas. Among them, the photovoltaic micro-inverter power generation system has the advantages of small investment, low installation cost, and easy maintenance, which is very suitable for the power supply in the above-mentioned areas. [0003] During the operation of the photovoltaic micro-inverter power generation system, the power ...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a micro-inverter with a long life and high power density equipped with a photovoltaic side decoupling circuit in order to solve the problems of the existing micro-inverter such as large volume and short service life. The present invention also provides the micro-inverter The working method of micro-inverter to realize photovoltaic grid-connected power generation

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