1. Independent photovoltaic power generation
Independent photovoltaic power generation is also known as off-grid photovoltaic power generation. It consists mainly of solar modules, controllers and batteries. To power an AC load, an AC inverter needs to be configured. Independent photovoltaic power plants include village power supply systems in remote areas, solar home power systems, communication signal power supplies, cathodic protection, solar street lights and other independently operating photovoltaic power generation systems.
2. Grid-connected photovoltaic power generation
Grid-connected photovoltaic power generation is directly connected to the public power grid after the DC power generated by the solar module is converted into AC power that meets the requirements of 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 is schedulable, can be integrated into the grid or merged from the grid as needed, and has the function of a backup power source, which can be powered urgently when the grid is powered off. Photovoltaic grid-connected power generation systems with batteries are typically installed in residential buildings; grid-connected power generation systems without batteries do not have the functionality of schedulability and backup power, and are typically installed on larger systems.
Grid-connected photovoltaic power generation concentrates on large-scale grid-connected photovoltaic power plants, generally state-level power plants.
Advantages: It can be directly delivered to the grid, and the grid can be deployed in a unified manner to supply power to users.
Disadvantages: Power station investment is large, construction period is long, area is large, and development is not much.
Decentralized small-scale grid-connected photovoltaic power generation, especially photovoltaic building integrated photovoltaic power generation, is the mainstream of grid-connected photovoltaic power generation due to its small investment, fast construction, small floor space and strong policy support.
3. Distributed photovoltaic power generation
Distributed photovoltaic power generation systems, also known as decentralized or distributed power sources, refer to the configuration of small photovoltaic power generation systems at or near a user site to meet the needs of specific users and to support the economics of existing distribution networks. Run or both meet these two requirements.
The basic equipment of the distributed photovoltaic power generation system includes photovoltaic battery components, photovoltaic array brackets, DC combiner boxes, DC power distribution cabinets, grid-connected inverters, and AC power distribution cabinets. In addition, the power supply system monitors the device and the environmental monitoring device. The operation mode is that under the solar radiation condition, the solar cell module array of the photovoltaic power generation system converts the solar converted electric energy into a DC power distribution cabinet through a DC combiner box, and converts it into an alternating current power. Powered by the grid-connected inverter. By connecting the grid to regulate the load of the building itself, excess or insufficient power.