The world's largest high-voltage direct mounted energy storage project--Seetao

Recently, the world's highest and largest high-voltage direct mounted energy storage system, the Huaneng Hainan State 150 MW/600 MWh energy storage project, was successfully connected to the grid and achieved full power operation in Hainan State, Qinghai Province at an altitude of 3000 meters. This project is invested and developed by Huaneng Qinghai Branch, and developed and constructed by Huaneng Qingneng Institute. The total installed capacity is 150 MW/600 MWh. It is a shared energy storage project on the grid side of three new energy projects newly built by Huaneng Qinghai Branch. The overall project adopts the 35 kV high-voltage direct hanging energy storage technology led by Qingneng Institute, with a single unit capacity of 25 MW/100 MWh. It can store 600000 kWh of electricity on a single charge and can independently accept grid regulation. It has the characteristics of high voltage level, large single unit capacity, few AC/DC parallel connections, and few communication levels. It does not require a power frequency transformer. On the basis of improving battery capacity utilization and reducing battery parallel safety risks, the system efficiency is improved by 4% to 6%, and it can achieve fast response within 10 milliseconds. In addition, to adapt to the special environment of Qinghai, the project has focused on correcting insulation and electrical clearances at high altitudes to ensure safe, stable, and efficient operation under high-altitude conditions. After the project is put into operation, it can effectively stabilize the fluctuation and intermittency of the output of new energy power stations, provide peak shaving, frequency regulation, power assistance and other services for the power grid, and effectively improve the quality and safety level of the power grid. Editor/Zhou Yingwen

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