Recently, the Foshan Baotang Grid-Side Independent Battery Energy Storage Station of China Southern Power Grid (hereinafter referred to as the "Baotang Energy Storage Station") was put into operation, with an installed capacity of 300MW/600MWh. Among them, two sets of 10kV/5MW/10MWh high-voltage cascaded battery energy storage systems were jointly developed by Sifang Automation and the China Southern Power Grid Energy Storage Research Institute.
The Baotang Energy Storage Station is the largest energy storage station in the Guangdong-Hong Kong-Macao Greater Bay Area and the largest grid-side independent energy storage station built at one time in China. After its commissioning, it can directly increase the total amount of new-type energy storage in operation in Guangdong by about 20%. The Baotang Energy Storage Station focuses on three major technical fields: lithium battery thermal management, structural connection, and battery performance. By combining different technical methods, it has formed nine technical routes. Through comparative analysis of key technical indicator data of different technical routes, a complete set of evaluation results for multiple technical routes can be obtained, providing important references for the technical application and industrial development of new-type energy storage in China.
The energy storage systems supplied by Sifang Automation and the China Southern Power Grid Energy Storage Research Institute for this project adopt the high-voltage cascaded technical route, directly connecting the energy storage system to the 10kV AC system without a transformer through module cascading, achieving efficiency optimization. The system adopts innovative solutions such as cluster-level efficient thermal management, multi-dimensional thermal isolation, module-level precise fire protection, and three-dimensional protection design, which improve the overall thermal management efficiency of the system, reduce the risk of system failures caused by cable heating, enhance the reliability of energy storage system protection, and achieve minimum fire compartmentalization and precise fire protection.
