What are the components of a battery energy storage system

　　The composition of energy storage system mainly includes battery system, PCS inverter system, box transformer system (if any), station transformer system (if any), energy management system and monitoring system (SCADA system), primary and secondary cables, etc.

　　1. Battery system

　　At present, energy storage methods are mainly divided into three categories: physical energy storage (pumped storage, compressed air storage, flywheel storage, etc.), chemical energy storage (lead-acid batteries, redox flow batteries, sodium sulfur batteries, lithium-ion batteries), and electromagnetic energy storage. Due to economic and application scenarios, chemical energy storage is the most widely used in addition to pumped storage. From the international and domestic markets, the application of lithium-ion in chemical energy storage is more common.

　　2. PCS inverter system

　　The energy storage bidirectional converter, abbreviated as PCS, can achieve AC/DC conversion between the battery and the power grid, complete bidirectional energy flow between the two, and achieve charge and discharge management of the battery system, grid load power tracking, battery energy storage system charge and discharge power control, and control grid measurement voltage under normal and islanded operation modes through control strategies; It has the characteristics of high conversion efficiency, wide voltage input range, fast and off grid switching, and convenient maintenance. At the same time, it has complete protection functions, such as island protection, DC overvoltage protection, and low voltage ride through (optional), to meet the requirements of system integration and off grid.

　　3. Box transformer system (if any)

　　If a high-voltage (6kV, 10kV, 20kV, 35kV, etc.) grid connected system is used, a box transformer must be used to complete the boosting task. To minimize electromagnetic interference and circulating current effects between the two branches, a double split transformer is used in the box transformer system, and other parameters are not significantly different from those of wind power and photovoltaic.

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