Photovoltaic power generation systems are divided into independent photovoltaic systems and grid-connected photovoltaic systems. Independent photovoltaic power stations include village power supply systems in remote areas, solar power systems for household use, communication signal power supplies, cathodic protection, and solar street lights, and various photovoltaic power generation systems with batteries that can operate independently.
A grid-connected photovoltaic power generation system is a photovoltaic power generation system that is connected to a power grid and supplies power to the power grid. It can be divided into grid-connected power generation systems with and without batteries. The grid-connected power generation system with battery has dispatchability, can be incorporated into or withdrawn from the power grid as required, and also has the function of backup power supply. When the power grid is out of power for an emergency, it can be powered urgently. Photovoltaic grid-connected power generation systems with batteries are often installed in residential buildings; grid-connected power generation systems without batteries do not have the functions of dispatchability and backup power supply and are generally installed on larger systems.
Photovoltaic power generation system consists of solar cell arrays, battery packs, charge and discharge controllers, inverters, AC distribution cabinets, and solar tracking control systems.
In the presence of light (whether it is sunlight or light from other light emitters), the battery absorbs light energy and the accumulation of different charges at both ends of the battery generates a “photovoltaic voltage,” which is the “photovoltaic effect”. Under the effect of the photovoltaic effect, the two ends of a solar cell generate an electromotive force and convert light energy into electrical energy. This is an energy conversion device. Solar cells are generally silicon cells, divided into monocrystalline silicon solar cells, polycrystalline silicon solar cells and amorphous silicon solar cells.
It is a device that can automatically prevent the battery from overcharging and overdischarging. Since the number of cycles of charge and discharge and the depth of discharge of the battery are important factors that determine the service life of the battery, a charge-discharge controller capable of controlling the overcharge or over-discharge of the battery is an indispensable device.
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