Solar power generation systems are divided into off-grid power generation systems, grid-connected power generation systems and distributed generation systems:
1. The off-grid power generation system is mainly composed of solar battery components, controllers, and accumulators. If the output power is AC 220V or 110V, an inverter must also be configured.
2. The grid-connected power generation system 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 mains power grid through the grid-connected inverter. Grid-connected power generation systems There are centralized large-scale grid-connected power stations that are generally state-level power stations. The main feature is that the generated power can be directly transmitted to the power grid, and the power supply can be provided to the users through the unified deployment of the power grid. However, this kind of power station has a large investment, a long construction period, and a large area, but it has not yet achieved much development. The decentralized small-scale grid-connected power generation system, especially the photovoltaic building integrated power generation system, is the mainstream of grid-connected power generation because of its advantages of small investment, quick construction, small footprint, and strong policy support.
3. Distributed generation systems, also known as decentralized generation or distributed energy supply, refer to the deployment of smaller photovoltaic power generation systems at or near the user's site to meet the needs of specific users and to support existing distribution networks. Economic operation, or both meet the requirements of both.
The basic equipment of the distributed photovoltaic power generation system includes photovoltaic cell modules, photovoltaic square array supports, DC combiner boxes, DC distribution cabinets, grid-connected inverters, and AC distribution cabinets, as well as power supply system monitoring devices and environmental monitoring. Device. The operating mode is that under the condition of solar radiation, the solar cell module array of the photovoltaic power generation system converts the output energy of the solar energy into the DC distribution cabinet through the DC convergence box and reverses the conversion from the grid-connected inverter to the alternating current supply. The building itself is loaded, excess or insufficient power is regulated by connecting the grid.