World's largest high-voltage direct-connected grid-connected energy storage project successfully connected to the grid
Release time:
2024-08-02 15:02
Source:
Power Construction Corporation of China
On July 28, the world's largest high-voltage direct-connected grid-connected energy storage project, the Qinghai Haixi Bao Ku Energy Storage Power Station, general contracted by Power Construction Corporation of China East China Institute, was successfully connected to the grid.
The Bao Ku energy storage project is one of three large-scale electrochemical energy storage power stations planned for the Haixi Prefecture region. It is a planned project under the "14th Five-Year Plan" for large-scale electrochemical energy storage in Qinghai Province. The power station has a total installed capacity of 224.5MW/889MWh and is located in Golmud City, Haixi Mongol and Tibetan Autonomous Prefecture, Qinghai Province. It covers an area of 53,000 square meters and is at an altitude of approximately 2850 meters.
The power station adopts a "centralized + grid-connected joint operation" mode, consisting of a traditional centralized energy storage system of 116MW/458.6MWh and a grid-connected high-voltage direct-connected energy storage system of 108MW/430.4MWh. The centralized energy storage system has 35 energy storage units, and the high-voltage direct-connected energy storage system uses eight sets of parallel direct-connected energy storage complete sets of equipment. The 430.4MWh high-voltage direct-connected energy storage system is the world's largest high-voltage direct-connected grid-connected energy storage project.
Compared with conventional energy storage, the new high-voltage direct-connected energy storage technology reduces intermediate links such as transformers. It directly connects to the medium and high-voltage grid through the cascade of PCS, reducing energy loss during the conversion process. By constructing a synchronous voltage source, it achieves voltage source external characteristics similar to those of a synchronous machine, and has the ability to stabilize the power system in the pre-disturbance, disturbance, and post-disturbance stages. At the same time, the power station is closer to the main grid, with better support performance and higher cycle efficiency.
Since the start of construction in October 2023, the project team has quickly organized construction forces to enter the site, overcoming multiple challenges such as severe cold weather, sandstorms, and high-altitude operations. After completion, the power station is expected to charge and discharge 350 times per year, with an annual discharge volume of approximately 261,400 MWh. This will significantly improve the peak-shaving capacity and new energy consumption capacity of the Haixi Prefecture grid, alleviate the peak-shaving and frequency regulation pressure on the Qinghai grid, further improve the operational safety and stability of the Qinghai grid, and play a positive role in promoting the high-quality development of Qinghai's national clean energy industry base.
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