The electrical integration design process in energy storage system is based on the application scenarios of the energy storage system, involving various aspects such as DC, high/low voltage distribution, control power distribution, grounding and lightning protection, safety standards and specifications. These important electrical designs are key factors in ensuring the safe and efficient operation of energy storage systems. The following is an introduction to the characteristics of relevant electrical equipment:

1、Low voltage switchgear：Low voltage switchgear generally includes low-voltage circuit breakers, low-voltage isolation switches, metering meters, surge protectors, and cabinets. It is necessary to consider voltage insulation, copper bars, protective wires, cables, etc., and use low-voltage circuit breakers with repeatable actions and graded surge protectors.

2、Transformers: Transformers in energy storage systems are used to coordinate the matching between different DC side voltages and grid voltages, while also taking into account the efficiency and control mode of PCS. Most dry-type transformers with copper windings also need to fully consider the AC grounding method.

3、High voltage switchgear: Most high-voltage switchgear use central cabinets or ring main cabinets, and the selection of high-voltage cables needs to consider the installation method and environment.

4、Battery combiner cabinet: The battery combiner cabinet is the main circuit electrical switchgear closest to the battery cluster, which can achieve parallel convergence of multiple battery clusters, DC line strategy and protection, and electrical connection between PCS.

5、Control distribution design: Control system distribution equipment, real-time controllers, and secondary equipment such as BMS are usually integrated into the battery combiner cabinet. While reducing the number of cabinets and costs, it is conducive to convenient monitoring of the overall working status. The power supply of each control system needs to be determined based on the capacity of the energy storage system and actual operating conditions.

In summary, the design of electrical equipment in energy storage systems should comprehensively consider factors such as electrical performance, safety, reliability, and maintainability to ensure the long-term stable operation of the energy storage system.