The grid hybrid inverter has a conversion efficiency of 97.6% and integrates a charge controller, an energy storage inverter, and a photovoltaic inverter. It can automatically determine the off-grid/on-grid mode, connect to the smart grid, and achieve peak shaving and valley filling. Perfect battery charging curve and protection scheme, compatible with lead-acid, lithium batteries, etc.
Solar photovoltaic grid-connected off-grid hybrid power generation system, including controller, solar cell array, battery pack, DC emergency load, grid-connected inverter, etc., characterized by the controller, including operation mode control unit, maximum power point Tracker, medium voltage DC bus, DC step-down converter, low voltage DC bus, charge and discharge controller, emergency output switch relay J1, etc.
Most of the DC power output by the solar cell array is converted to AC power by grid-connected inverters and sent to the public distribution network; a small part is provided to DC emergency loads and battery packs through DC step-down converters and low-voltage DC buses(Off-Grid Power Inverters). When the low-voltage DC bus voltage is outside the normal range, the battery pack provides energy to the DC emergency load. The grid-connected off-grid hybrid power generation system improves the system efficiency and annual power generation time and has good application prospects.
Solar photovoltaic power generation can replace and reduce the use of limited, non-renewable fossil fuels such as coal, oil, natural gas, and other secondary energy sources. Promoting the application of solar photovoltaic power generation is of great significance for reducing the consumption of fossil energy and optimizing the energy structure.
The grid-connected solar photovoltaic power generation system consists of a square array of solar cells, grid-connected inverters, and a public distribution network. Solar energy is converted into DC power through a square array of solar cells, and then the DC power is converted to AC power through a grid-connected inverter. The current is the same frequency and phase as the voltage of the public distribution network. The solar photovoltaic grid-connected power generation system can work in areas with public grids, and it does not require energy storage devices, which is a major advantage.