Currently, large-scale energy storage on the power grid side is mainly containerized, with liquid-cooled and air-cooled battery compartments. It is generally boosted to 35kV output through a PCS converter booster unit.
User-side energy storage grid connection voltage levels are generally 400V, 10kV, or 35kV. For 400V grid connection, the mainstream outdoor cabinet type is generally used (some use small containers), employing a three-phase four-wire PCS (without the need for an isolation transformer). Medium and large-scale user-side energy storage typically uses medium and large-scale containerized types. When selecting non-isolated PCS, an isolation transformer can be added. The product type is mostly all-in-one, but there are also split types, or only the PCS is integrated into the battery compartment (the isolation transformer is wall-mounted or placed separately). User-side 10kV or 35kV grid connection generally still uses containers, and the type is mostly consistent with large-scale source-grid-side energy storage.
1. Large-scale energy storage
1) Liquid cooling (3.45MW/6.7MWh, 0.5°C)
2) Air-cooled (2.5MW/5.017MWh, 0.5C)
3) Liquid cooling (3.45MW/13.4MWh, 0.25°C)
4) Air-cooled (2.5MW/10.034MWh, 0.25°C)
2. User side
1) Liquid cooling (100kW/215kWh, 0.5°C)
2) Air-cooled (1MW/2MWh, 0.5°C)
3) Liquid cooling (1MW/3.35MWh, 0.33°C)
