Large-scale energy storage systems can be divided into the following types according to the electrical structure:
Centralized energy storage system: This system uses low-voltage and high-power boosting to connect to the grid. Multiple battery clusters are connected in parallel and connected to the power conversion system (PCS), pursuing high power and high efficiency. At present, the 1500V solution is being promoted.
Distributed energy storage system: Each battery cluster is connected to a PCS unit, using a low-power, distributed layout.
Intelligent string energy storage system: Based on the distributed energy storage system architecture, it adopts innovative technologies such as battery module-level energy optimization and digital intelligent management to achieve more efficient applications.
High-voltage cascade high-power energy storage system: A single battery cluster is inverter, without a transformer, directly connected to the 6/10/35kv or above voltage level grid, and the capacity of a single unit can reach 5MW/10MWh.
Distributed energy storage system: Multiple branches are connected in parallel on the DC side, and a DC/DC converter is added at the battery cluster outlet to isolate the battery cluster, which is then connected to the centralized PCS DC side after being collected.