World’s largest multi-mixed battery energy power station added to Chinese grid

World’s largest multi-mixed battery energy power station added to Chinese grid

Business news |
By Nick Flaherty

The Luneng Haixi Multi-mixed Energy Demonstration Project integrates wind (400MW), photovoltaic (200MW), concentrated solar power (50MW), and a 100MWh battery-based energy storage system (ESS) into one unified system on the grid.

The Station coordinates three different renewable, with fluctuating and particularly unstable, sources of energy and is required to respond consistently to fluctuating demand, making its batteries and battery management system crucial to the reliability of the system. CATL, the exclusive battery supplier for the Project, overcome the requirements during product design and development stage and took 17 days to test and commission the BESS to the grid.

“The Station is the first of its kind – a multi-functional, centralized power plant integrated with an electrochemical energy storage system. Its technical reliability and affordability will promote further global deployment of different renewable energy applications,” said Huang Shilin, Vice Chairman and Chief Strategy Officer of CATL.

CATL uses the Potential Failure Mode and Effects Analysis (FMEA) design process to identify risks and execute risk mitigation plans in early stages of product development, manufacturing and management to ensure safe operation of the battery system with well-designed battery cell, module, cabinet and control system. Using a three-layer relay protection system, CATL further assures performance of the battery system from damages caused by over-charging/discharging, over-current, mitigate over and under temperature working conditions.

One of the key challenges of safety and performances that CATL and the industry face is thermal management. The Station, installed at Golmud where temperature varies from -33.6 to 35.5ºC. To ensure 15 years of battery performance, CATL has deployed a cooling system that uses air passages and air flow designs to maintain a consistent cabinet temperature. A battery management unit will kick-in the battery cooling system as soon as it detects thermo concerns, while pre-stored electricity protects the battery from capacity loss or lithium plating caused by charging in cold temperatures.

As Golmud lies in an active seismic zone, vibration and shock absorption has to be considered in the BESS design. CATL’s state of the art Test & Validation Center carried out testing and simulation to show its batteries are able to withstand a potential earthquake of magnitude 8.

The Station is “the World’s first and China’s largest electromechanical energy storage station with virtual synchronous generator,” said Dr. Hui Dong, Chief Scientist of China Electric Power Research Institute.

CATL is China’s largest battery provider specializing in the manufacturing lithium-ion batteries for electric vehicles and energy storage systems, shipping 12GWh of batteries for electric vehicles and BESS systems in 2017 with EV battery installation volume of 2018 of 23.43GWh. 

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