Yongxing Lithium Battery| Yongxing Special Steel 12MW/12MWh Commercial and Industrial Hybrid Energy Storage Project Phase I Grid Connection Operation

On December 8, 2023, the Phase I of the Yongxing Special Steel Commercial and Industrial Hybrid Energy Storage Project, constructed in collaboration between Yongxing Lithium Battery and Yuanhe Energy, was officially grid connected and operational at the Yongxing Special Steel factory in Huzhou, Zhejiang Province. This project represents a successful application of hybrid energy storage in commercial and industrial energy storage projects. The Phase I of the project utilizes 2MW/4MWh lithium iron phosphate batteries from Yuanhe Energy and 4MW/2MWh lithium titanate batteries from Yongxing Lithium Battery.

Located in Huzhou City, Zhejiang Province, the total scale of the Phase I energy storage system is 6MW/6MWh. The configuration scheme of this hybrid energy storage system includes the use of the 2MW/4MWh lithium iron phosphate battery pack from Yuanhe Energy for peak shaving to meet the demand for reducing the electricity cost of the factory, and the 4MW/2MWh lithium titanate battery pack from Yongxing Lithium Battery for load smoothing, stable factory voltage and frequency, and improving grid stability. This solution is specifically developed to serve typical traditional energy-intensive enterprises such as steel mills. With the addition of high-power energy storage systems, it can optimize the load curve, reduce grid volatility and equipment losses, enhance equipment compatibility and flexibility. The project has reduced the comprehensive electricity cost for customers, demonstrated positive results, and is expected to be replicated and promoted in similar types of enterprises in the steel industry.

Before the storage retrofit in this project, the instability of the power supply had various adverse effects on the electrical equipment throughout the plant: 1. Sporadic frequency conversion drive equipment would trigger alarms or even trip and stop due to voltage fluctuations exceeding the limits; 2. Grid fluctuations would reduce the lifespan of transmission equipment, leading to higher failure rates in power modules, etc.; 3. The control accuracy of precision speed control equipment such as rolling mills could not meet the process requirements.

The high-rate characteristic of lithium titanate makes the 4MW/2MWh lithium titanate system more suitable for providing frequency regulation services and maintaining stable voltage in the factory. Peak-shaving benefits are secondary, supplemented by a certain capacity of lithium iron phosphate energy storage batteries primarily for peak shaving benefits, while also complementing the system’s frequency regulation and ancillary services capabilities. This setup can enhance both voltage stabilization and frequency regulation capabilities of the system while increasing peak-shaving benefits.

This project also integrated with the Zhejiang Province Virtual Power Plant Operation Platform. The successful grid connection and operation of this project signify a new breakthrough in the application of hybrid energy storage in the commercial and industrial energy storage sector. Hybrid energy storage systems can fully leverage the advantages of different types of energy storage batteries, enhancing the overall performance of energy storage systems.