A single-phase photovoltaic grid-connected micro-inverter

A technology of micro-inverter and flyback inverter, which is applied in photovoltaic power generation, instruments, and regulation of electrical variables, etc. It can solve the problems of complex control of secondary switching tubes, increased voltage stress of switching tubes, and increased losses. Strong anti-partial shadow ability, high reliability, and easy configuration

Inactive Publication Date: 2016-03-30
ANYANG NORMAL UNIV
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Problems solved by technology

[0009] Three-port decoupling method, the decoupling circuit is isolated from the photovoltaic module, the large voltage ripple on the decoupling capacitor will not affect the output characteristics of the photovoltaic module, and the capacitor voltage and voltage ripple are greatly impro

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  • A single-phase photovoltaic grid-connected micro-inverter
  • A single-phase photovoltaic grid-connected micro-inverter
  • A single-phase photovoltaic grid-connected micro-inverter

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[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art fall within the protection scope of the present invention.

[0031] The design idea of ​​the present invention: In the micro-inverter system, under certain temperature and light conditions, the photovoltaic module outputs a constant power according to the maximum power tracking:

[0032] P PV =V PV ×I PV

[0033] Where V PV And I PV They are the output DC voltage and current of the photovoltaic module.

[0034] When the flyback inverter operates with unit power factor, the sinusoidal current injected into the grid is...

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Abstract

The invention discloses a single-phase photovoltaic grid-connected micro-inverter comprising a photovoltaic assembly which is connected to a decoupling circuit. An output terminal of the decoupling circuit is connected to a flyback inverter. The flyback inverter is connected to a rear-stage full-bridge circuit. An output terminal of the rear-stage full-bridge circuit is connected to a municipal power-supply network. The beneficial effects of the present invention are that each photovoltaic assembly works at a maximum power point; the anti partial-shading capability is strong; each flyback inverter is integrated with a single photovoltaic assembly; the single-phase photovoltaic grid-connected micro-inverter can be used once plugged; the installation is convenient; the system expansion is convenient and simple; the space occupied by the flyback inverter is small; the single-phase photovoltaic grid-connected micro-inverter is installed in a distributed mode so as to provide convenience for configuration; and the single-phase photovoltaic grid-connected micro-inverter can be installed in different directions at different angles so as to fully utilize space. The failure of a single photovoltaic assembly will not influence the performance of the whole system. The redundancy of the system is high and the reliability is high.

Description

technical field [0001] The invention relates to a single-phase photovoltaic grid-connected micro-inverter. Background technique [0002] At present, the construction mode of my country's photovoltaic power plants is no longer blindly pursuing large scale, and the construction focus is gradually shifting from the centralized construction of megawatt-level demonstration power plants to small distributed power plants close to the user side. In order to encourage the construction of distributed power stations, the National Energy Administration document (Guoneng Xinneng [2015] No. 73) stipulates that "there is no restriction on the construction scale of distributed photovoltaic power generation projects on the roof and all self-contained ground distributed photovoltaic power generation projects. Energy authorities accept project filings at any time, grid companies handle grid connection procedures in a timely manner, and projects will be included in the scope of subsidies after ...

Claims

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Application Information

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IPC IPC(8): H02M7/537H02M3/335
CPCH02M3/33523H02M7/537H02M1/007Y02E10/56
Inventor 陈永超潘三博苗风东李研达高相铭邹玉炜丁电宽
Owner ANYANG NORMAL UNIV
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