The energy storage system mainly consists of battery system, boost converter system, switch and protection equipment, auxiliary function system, etc.
The power access point of the energy storage system is connected to the main circuit of the power system. Through high-voltage switches and protection equipment, transformers, energy storage converters and other power and voltage conversion equipment, the interaction between the battery system and the grid energy is realized. Common access voltage levels include 0.4kV, 6kV, 10kV, and 35kV. Large-scale independent energy storage power stations need to build independent booster stations to meet 110kV or 220kV system access.
The communication access point of the energy storage system is connected to the computer monitoring system or dispatching automation system of the booster station, accepts the dispatching control and operation management of the superior monitoring system, and uploads information to monitoring systems at all levels in accordance with the relevant requirements of dispatching and the construction party's operation and maintenance platform.
The auxiliary access point of the energy storage system is connected to the transformer used in the energy storage station to provide control power for key loads in the station. The centralized power system of the station will also supply power to the battery system, air conditioners and fan-type HVAC equipment of the boost converter system.
The battery system is the core equipment of the electrochemical energy storage system and the unit of energy storage. It generally adopts a multi-level, modular integration technology route.
According to the four levels of battery cells, battery modules, battery clusters and battery units, several single cells are connected in series and parallel with metal conductors to form a battery module. In order to facilitate installation and maintenance, battery modules generally adopt a drawer-type structure. Multiple battery modules are connected in series to form a battery cluster. The battery cluster generally adopts a cabinet or frame structure. In order to manage the safe and controllable connection between the main circuit output port of the battery cluster and the external circuit, the battery cluster is generally equipped with a battery management system, a high-voltage insulation detection unit, a current sensor, a fuse, a precharge resistor, a contactor, a circuit breaker and other control systems and switches protection device which are all integrated inside the high-voltage box.
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