Photovoltaic power generation system with grid-connected generation, independent power generation and UPS function

Abstract

The invention discloses a photovoltaic generation system with grid-connected generation, independent generation and UPS functions mainly comprising a solar cell array, a DC / DC insulation conversion and control device, a maximum power point control module, an energy storage device, a cell charge-discharge control module, a grid-connected / independent / UPS function conversion and control module, an auxiliary power and a communication and display device, wherein the grid-connected / independent / UPS function conversion and control module mainly accomplishes the conversion of the three functions suchas grid-connected generation, independent generation and uninterruptible power supply and the judgment for automatic conversion condition. The three functions of grid-connected generation, independent generation and UPS are achieved due to the adoption of software judgment and control means without increasing any hardware cost, furthermore the three functions can automatically work at some optimum state according to the different work environment conditions and power conditions, thereby reducing the maintenance quantity of the device by users, making the photovoltaic energy fully played and providing powerful guarantee for the power supply of the users.

Description

technical field [0001] The invention relates to a grid-connected solar photovoltaic power generation system, in particular to a photovoltaic power generation system with functions of grid-connected power generation, independent power generation and UPS. Background technique [0002] Photovoltaic grid-connected power generation technology is a new technology that has emerged in recent years. Compared with traditional coal power and oil power, it has many advantages such as environmental protection, no energy consumption, and reusability. It will be the focus of energy strategy development in the future. Many countries abroad have implemented rooftop photovoltaic programs. Because rooftop photovoltaic power generation is not subject to geographical restrictions, does not occupy arable land, and can be used in cities to achieve grid connection with large power grids, it has a very broad market prospect. With the gradual reduction of the cost of photovoltaic power generation, r...

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Problems solved by technology

[0003] At present, there are more grid-connected photovoltaic power generation systems on the market, or photovoltaic power generation systems that only have independent power generation. The former cannot be connected to the grid when the power grid fails, and the power generation is greatly restricted by the grid; the latter is when the power grid fails. When it rains for a long time, the electric energy cannot be output in time, and in severe cases, the battery in the energy storage device may be damaged

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