Photovoltaic power generation has the advantages of being clean, unlimited, free from geographical restrictions, and small in operation and maintenance. Therefore, compared with renewable energy such as nuclear power and biomass energy, it has obvious advantages. Types and characteristics of photovoltaic power generation:
一、 Off-grid photovoltaic power generation
Off-grid photovoltaic power generation systems are widely used in remote mountainous areas, areas without electricity, islands, communication base stations and street lights.
Off-grid solar power generation system uses solar panels to convert solar energy into electrical energy in the presence of sunlight, powers the load through the solar charge and discharge controller, and charges the battery at the same time; in rainy days or no sunlight, through solar charge and discharge control The battery packs power supply to the DC load. At the same time, the battery can also directly supply power to the independent inverter, which is inverted into AC power through the independent inverter to supply power to the AC load.
二、Grid-connected photovoltaic power generation
The grid-connected photovoltaic power generation system is composed of a square array of photovoltaic cells and a grid-connected inverter. It does not store energy through the battery, and directly inputs electric energy into the public grid through the grid-connected inverter. Compared with the off-grid photovoltaic power generation system, the grid-connected photovoltaic power generation system saves the battery energy storage and release process, reduces the energy consumption in it, saves the space occupied, and reduces the configuration cost.
三、 Distributed photovoltaic power generation
Distributed photovoltaic power generation refers to photovoltaic power generation facilities that are built near the user's site, and the operation mode is self-generated and used by the user, the surplus power is mainly used for the grid, and the power distribution system is balanced and regulated by the photovoltaic power generation facility.
The distributed photovoltaic power generation system consists of a square array of solar cells, a combiner box, a grid-connected inverter, and an AC power distribution cabinet. The generated electricity is given priority for self-use, and the surplus electricity generated is directly input into the AC power distribution cabinet through the grid-connected inverter, and merged into the corresponding power voltage through the relevant grid-connected equipment, and automatically switches to the grid when it is cloudy or rainy or without sunlight The power supply mode reflects the demand for environmental protection and green power.