Classification of Solar Power Generation Systems

2020-10-19

Solar power system parts are divided into off-grid power generation system, grid-connected power generation system and distributed power generation system. The following is a detailed introduction to the classification of solar power system parts:

1. The off-grid power generation system is mainly composed of solar cell components, controllers, and batteries. If the output power is AC 220V or 110V, an inverter is also required.

2. Grid-connected power generation system means that the DC power generated by solar power system parts is converted into AC power that meets the requirements of the mains power grid by the grid-connected inverter and directly connected to the public grid. Grid-connected power generation systems include centralized large-scale grid-connected power stations, which are generally national power stations. Its main feature is to directly transmit the generated energy to the grid, which is uniformly deployed to supply power to users. However, this kind of power station requires a large investment, a long construction period, and a large area, and it has not developed much. The distributed small-scale 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 footprint, and large policy support.

3. Distributed power generation system, also known as distributed power generation or distributed energy supply, refers to the configuration of a small photovoltaic power supply system at the user site or close to the power site to meet the needs of specific users and support the economic operation of the existing distribution network, or satisfy both requirements at the same time.

The basic equipment of a distributed photovoltaic power generation system includes photovoltaic cell components, photovoltaic square array brackets, DC combiner boxes, DC power distribution cabinets, grid-connected inverters, AC power distribution cabinets and other equipment, as well as power supply system monitoring devices and environmental monitoring device. Its operating mode is that under the condition of solar radiation, the solar cell module array of the photovoltaic power generation system converts the output electric energy from the solar energy, and sends it to the DC distribution cabinet through the DC combiner box, and then is inverted into AC power by the grid-connected inverter to supply the building's own load, and the excess or insufficient power is adjusted through being connected to the grid.