1, there is a counter-current grid-connected photovoltaic power generation system
There is a counter-current grid-connected photovoltaic power generation system: when the solar photovoltaic system sends out abundant electricity, can be fed into the public **** grid, to the grid power supply (sell electricity); when the solar photovoltaic system to provide electricity is insufficient, by the electricity to the load power supply (buy electricity). Due to the power supply to the grid with the grid power supply in the opposite direction, so it is called there is a counter-current photovoltaic power generation system.
2, no counter-current grid-connected photovoltaic power generation system
No counter-current grid-connected photovoltaic power generation system: solar photovoltaic power generation system even if the power generation of abundant also does not supply power to the public **** grid, but when the solar photovoltaic system power supply is insufficient, it is from the public **** grid to the load power supply.
3, switching grid-connected photovoltaic power generation system
The so-called switching grid-connected photovoltaic power generation system, in fact, has the function of automatic operation of two-way switching. First, when the photovoltaic power generation system due to cloudy, cloudy and rainy days and their own faults lead to insufficient power generation, the switcher can automatically switch to the grid side of the power supply, from the grid to the load power supply; Second, when the power grid because of some reason real blackout, the photovoltaic system can be automatically switched to make the grid and the photovoltaic system separation, to become an independent photovoltaic power generation system work state. Some switching photovoltaic power generation system, but also in the need to disconnect the power supply for the general load, connected to the emergency load power supply. General switching grid-connected power generation system with energy storage devices.
4, grid-connected photovoltaic power generation system with energy storage device
Grid-connected photovoltaic power generation system with energy storage device: it is in the above categories of photovoltaic power generation system according to the need to configure the energy storage device. PV systems with energy storage devices are more proactive and can operate independently and supply power to the load normally when there are power outages, power restrictions and faults in the power grid. Therefore, grid-connected photovoltaic power generation systems with energy storage devices can be used as the power supply system for important or emergency loads such as emergency communication power supply, medical equipment, gas stations, shelter instructions and lighting.