The core functions and roles of grid connected cabinets
As the boundary point between the power generation system and the grid, the grid connected cabinet integrates protection, monitoring, and metering modules. Its main functions include:
Electricity transmission and grid connection control: Convert the direct current output by the power generation system into alternating current that meets the requirements of the power grid, achieving bidirectional flow of electricity (such as Photovoltaic surplus electricity grid connection or grid replenishment).
Security Protection: Equipped with islanding protection (cut off within 0.2 seconds in case of power grid failure), lightning protection (10/350 μ s lightning wave protection), overvoltage/undervoltage protection, and short circuit protection, ensuring the safety of equipment and personnel.
Intelligent monitoring and optimization: Real time monitoring of voltage, current and other parameters through an energy management system (EMS), optimizing charging and discharging strategies (such as peak shaving and valley filling), improving power generation efficiency and economic benefits.
The difference between photovoltaic and energy storage grid connected cabinets
Photovoltaic grid connected cabinet: applied to solar power generation systems, it prioritizes the distribution of electrical energy to local loads, and transmits surplus electricity to the grid. It is equipped with high-precision electricity meters (error<0.2%) to achieve revenue transparency.
Energy storage grid connected cabinet: Integrated with bidirectional inverters, supporting grid frequency regulation and peak shaving, storing energy during low electricity prices and discharging during peak hours, reducing electricity costs, and providing emergency backup power for key locations such as hospitals.
Application scenarios
Distributed photovoltaics: Home rooftops, industrial and commercial power stations, achieving "spontaneous self use+surplus electricity grid connection".
Energy storage system: Industrial parks, microgrid projects, participating in grid auxiliary services (such as frequency regulation).
Renewable energy integration: applicable to wind power, photovoltaic and other systems, improving the consumption rate of new energy.