Tiered energy storage supports energy internet

China Energy Storage Network News : Cascade Energy Storage Supports Energy Internet

———Record of the first MWh-level battery energy storage power station in China connected to the grid interaction platform

Abstract: The first MWh-level industrial and commercial energy storage system in China based on the cascade utilization of retired power batteries, designed and invested in by Xuda New Energy, has been in operation for a quarter. It is currently the most economically valuable investment and has the foundation for large-scale promotion. After the State Grid Jiangsu Electric Power Company issued the "Regulations on the Grid Connection Management of User-side Energy Storage Systems", it became the first user-side cascade battery energy storage system to be connected to the user-side energy storage intelligent grid-connected interactive platform and accept the platform's grid-connected dispatching management.

With the development of social economy and the improvement of productivity, the intensity of electricity consumption in industrial sectors has gradually increased, and the difference between electricity supply and demand in time and space has become increasingly larger. This situation has brought tremendous pressure to our country's power supply system. In addition, some new power generation energy sources are constantly being discovered. For distributed wind power generation and photovoltaic power generation, due to the uncontrollability of wind power and light intensity, the generated electricity is volatile and intermittent. A large number of volatile wind power generation and photovoltaic power generation are incorporated into the traditional power grid, which will cause the power grid to be subjected to huge current shocks, causing problems such as power grid frequency deviation, voltage fluctuation and flicker. The power grid company builds a big data platform to collect and dispatch electricity consumption in various regions and equipment, and adjusts the power grid through equipment and platforms to ensure the stable operation of the power grid and power supply safety.

The first MWh-level cascade energy storage system in China designed by Shanghai Xuda New Energy Technology Co., Ltd. was successfully connected to the big data platform of State Grid Jiangsu Electric Power Company in December this year. The commissioning of the system is equivalent to building a reservoir for the distribution network system on the user side. The technology based on retired power batteries has created a milestone in the era of low-cost lithium battery energy storage and realized the commercial promotion value of energy storage. The cascade utilization energy storage system has become the user-side energy storage system with the most economic investment value and large-scale promotion basis. Jiangsu Power Grid has established a model through real-time monitoring data of the big data operation platform, and can take over part of the energy storage system when necessary to absorb fluctuations. Under normal circumstances, the system automatically executes the peak-shaving and valley-filling operation strategy. When the power grid load is low, the energy storage system absorbs excess energy in the power grid. When the power grid load is high, the energy storage system releases electricity to supplement the power supply gap of the power grid. The energy storage system can escort the smooth operation of the power grid and further reduce the investment of the power grid company in dispatching standby equipment.

With the advancement of battery energy storage technology, the gradual reduction of costs, and the maturity of the business model on the demand side, the application value of energy storage systems in power systems has gradually become apparent: with its rapid power regulation and the ability to supply and store energy, it has played a major role in smoothing intermittent energy power fluctuations, shaving peaks and filling valleys, improving voltage quality, and providing backup power. It is the key to the distribution network's flexible regulation of widely accessible distributed energy and optimized network operation.