Photovoltaic energy storage battery power generation system and control method

Abstract

The invention belongs to the technical field of photovoltaic power generation, and discloses a photovoltaic energy storage battery power generation system and a control method. According to the power generation system, photovoltaic batteries and matched single energy storage batteries form photovoltaic energy storage battery modules; a certain number of modules are connected in series according to the requirements; and module strings can be connected with one another in parallel to meet the requirements of loads on power. The control method comprises the following steps: controlling cut-in and cut-out of single photovoltaic batteries, single energy storage batteries and the modules thereof by monitoring voltages, currents, temperatures and the like of single photovoltaic battery modules and singe energy storage batteries; controlling cut-in and cut-out of the photovoltaic energy storage battery modules by monitoring the voltages of series branches; and controlling starting and stopping of the overall system by monitoring a busbar voltage. The photovoltaic energy storage battery power generation system and the control method can solve the problems of the 'shadow effect' and inconsistency of the photovoltaic batteries, the inconsistency and equilibrium management of an energy storage battery pack and energy management of photovoltaic energy storage.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and in particular relates to a photovoltaic energy storage power generation system and a control method thereof, which consist of a module composed of a single photovoltaic cell assembly and a single energy storage battery, and then the modules are connected in series and parallel to form a dynamic topology. Background technique [0002] Solar energy is a new type of energy that is ubiquitous, rich in resources and non-polluting. my country has abundant solar energy resources, and the areas with annual total solar radiation greater than 1050kW·h / m2 account for more than 96% of the country's land area. Due to the abundance, wide distribution, safety and cleanness of solar energy resources, and the maturity of solar energy conversion technology, solar energy is considered to be one of the best choices for human beings to replace traditional fossil energy in the 21st century. ...

AI Technical Summary

Problems solved by technology

[0004] However, no matter how the solar power storage modules are assembled in series or in parallel, when there is partial shading in the entire photovoltaic power generation system, the partial photovoltaic panels will receive less sunlight than other photovoltaic panels, making the local photovoltaic panels unable to normally protect the lithium battery. Charging or powering loads, and there are "shadow effects" and "hot spots" of photovoltaic cells; and the inconsistency of single cells in energy storage battery packs has always been a problem that is difficult to effectively solve in the industry

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