The main components of battery energy storage power station system

　　1. Transformers and high-voltage switchgear: convert the grid voltage (10KV, 6KV or other levels of voltage) transmitted from the grid into the voltage level required for the user's electrical appliances and electricity consumption (such as 0.4KV)

　　2. Low voltage switch and control cabinet: used for control and management of charging and discharging and electrical energy output

　　3. Control system: The battery energy storage system is controlled by a programmable logic controller (PLC) and a human-machine interface (HMI). One of the key functions of the PLC system is to control the charging time and rate of the energy storage system. It is integrated with the rest of the system through standardized communication inputs, control signals, and power supply. It can be accessed through dial-up or internet. It has multiple defense layers to restrict access to its different functions, and provides customized reporting and alarm functions for remote monitoring.

　　4. Power Conversion System (PCS): The function of a power conversion system is to charge and discharge batteries, and provide improved power quality, voltage support, and frequency control for the local power grid. It has a controller (DSP) that can perform complex and fast actions, multiple quadrants, and dynamics, with dedicated control algorithms that can convert outputs throughout the entire range of the device, i.e. cyclically absorbing from full power to full power output. Currently, bidirectional inverters are commonly used

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