Solar photovoltaic system is divided into off-grid photovoltaic power generation system, grid-connected photovoltaic power generation system and distributed photovoltaic power generation system:
1. Off-grid photovoltaic power generation system. It is mainly composed of solar cell module, controller and battery. To supply power for ac load, ac inverter is also required.
2. Grid-connected photovoltaic power generation system means that the direct current generated by solar modules is converted into alternating current in line with the requirements of the municipal power grid through grid-connected inverter and then directly connected to the public power grid. Grid-connected power generation system has centralized large grid-connected power stations are generally state-level power stations, which are mainly characterized by the direct transmission of the generated power to the power grid and the unified deployment of the power grid to supply power to users. But this kind of power station investment is big, construction cycle is long, cover an area is big, have not developed too much. The distributed small grid connected power generation system, especially the photovoltaic building integrated power generation system, is the mainstream of grid connected power generation due to the advantages of small investment, fast construction, small land area and strong policy support.
3. Distributed photovoltaic power generation system, also known as distributed power generation or distributed energy supply, refers to the configuration of a small photovoltaic power generation power supply system in the user site or near the power consumption site to meet the needs of specific users, support the economic operation of the existing distribution network, or meet the requirements of both.
The basic equipment of distributed photovoltaic power generation system includes photovoltaic cell modules, photovoltaic square bracket, dc confluent box, dc power distribution cabinet, grid-connected inverter, ac power distribution cabinet and other equipment, as well as power supply system monitoring device and environmental monitoring device. Its operation mode is in the solar radiation conditions, photovoltaic power generation system of solar cell module array to convert solar energy output power, a dc bus concentrated into dc power distribution cabinet, by the grid inverter inverter into alternating current supply of building their own load, excess or shortage of electricity through the grid to adjust.
Post time: Dec-17-2020