Solar power generation is divided into photothermal power generation and PERC PV, usually referred to as solar power generation refers to solar photovoltaic power generation, referred to as "photovoltaic". PERC PV is a technology that directly converts light energy into electrical energy by utilizing the photovoltaic effect of the semiconductor interface.
Photovoltaic power system refers to a power generation system that directly converts light energy into electrical energy without going through a thermal process. The photovoltaic power system usually consists of photovoltaic arrays, battery packs, battery controllers, inverters, AC power distribution cabinets, and sun tracking control systems.
Its main components are solar cells, accumulators, controllers and inverters. It is characterized by high reliability, long service life, no environmental pollution, independent power generation and grid-connected operation.
At present, photovoltaic power systems are divided into independent photovoltaic power systems, grid-connected photovoltaic power systems and distributed photovoltaic power systems.
Independent photovoltaic power generation is also called off-grid PERC PV. It is mainly composed of solar cell components, controllers, and batteries. To supply power to the AC load, an AC inverter needs to be configured.
Independent photovoltaic power plants include village power supply systems in remote areas, solar household power supply systems, communication signal power supplies, cathodic protection, solar street lights and other photovoltaic power systems with batteries that can operate independently.
Grid-connected PERC PV means that the direct current generated by the solar module is converted into alternating current that meets the requirements of the mains grid through the grid-connected inverter, and then directly connected to the public grid.
It can be divided into grid-connected photovoltaic power system with battery and grid-connected photovoltaic power system without battery. The grid-connected photovoltaic power system with battery is schedulable and can be integrated into or withdrawn from the grid as needed, and it also has the function of standby power supply, when the power grid is out of power for any reason, it can provide emergency power supply;
Photovoltaic grid-connected power systems with batteries are often installed in residential buildings; grid-connected photovoltaic power systems without batteries do not have the functions of dispatchability and backup power, and are generally installed on larger systems.
Distributed photovoltaic power systems can be further divided into centralized large-scale grid-connected photovoltaic power plants and distributed photovoltaic systems. The main feature of a centralized large-scale grid-connected photovoltaic power station is that it can directly transmit the generated power to the power grid, and the power grid will uniformly allocate power to users.
This kind of power station has large investment, long construction period and large area. The distributed photovoltaic power system has the advantages of small investment, fast construction, small footprint, and strong policy support.