China’s largest electrochemical energy storage project – the energy storage facility supporting new energy projects at Huaneng Longdong Energy Base – has commenced construction in Qingyang, Gansu Province
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On December 25, the new energy storage project supporting the Huaneng Longdong Energy Base commenced construction in Qingyang, Gansu. This is currently the largest electrochemical energy storage project under construction in the country. As a new energy storage project supporting the transmission of electricity from Gansu to Shandong, this project has a total capacity of 600 megawatts/2400 megawatt-hours, and is constructed in two locations. In particular, the energy storage power stations utilize the single-stage distributed energy storage technology independently developed by Huaneng Qingneng Institute. These systems consist of hundreds of battery cells connected in series to form battery clusters, with each cluster being processed for energy management using a single low-power PCS. This approach enables individual management of each cluster, resulting in simpler and more flexible operation and maintenance. It offers advantages in terms of consistency among cluster statuses, system capacity availability, cycle life, and system usability in the event of failures. The average overall efficiency is about 4.6 percentage points higher compared to centralized technology-based power stations, while the average capacity availability rate increases by around 5 percentage points. The project is expected to be completed and put into operation in the first half of 2025, in conjunction with the ultra-high voltage DC project from Longdong to Shandong. Once operational, it will be able to handle approximately 840 million kWh of renewable energy per year, and a single charge will allow it to store around 2.4 million kWh of energy. This will help promote the use of renewable energy sources, contribute to the safe and stable operation of the power system, and assist in the development of a new type of energy system that is clean, low-carbon, safe, and efficient.
It is understood that the energy storage station utilizes a self-developed single-stage distributed energy storage technology. It consists of hundreds of battery cells connected in series to form battery clusters, with each cluster being processed for energy distribution using a single low-power PCS unit. The batteries are connected only in series, with each cluster being controlled independently; multiple PCS modules are connected in parallel on the AC side. This technology offers better battery compatibility and enables management on a per-cluster basis ； The battery clusters connected in series with each distributed converter are smaller in scale, more integrated, and more refined, which eliminates the effects of concentrated parallel circulating currents and capacity losses. They offer simple and flexible operation and maintenance, and provide advantages in terms of consistency in the operating status of the battery clusters, system capacity availability, cycle life, and system availability in the event of failures. The average comprehensive efficiency is about 4.6 percentage points higher compared to power plants using centralized technology, while the average available capacity retention rate is about 5 percentage points higher. The project is scheduled to be completed and put into operation in the first half of 2025, in conjunction with the ultra-high voltage DC transmission project from Longdong to Shandong. Once operational, it will be able to handle approximately 840 million kWh of renewable energy per year; a single charge can store around 2.4 million kWh of energy, enough to meet the daily electricity needs of 480,000 households. The integrated development model of \"wind, solar, thermal, storage, and transmission\" for the UHV DC power transmission project from eastern Gansu to Shandong plays a significant role in effectively addressing the issue of new energy utilization, enhancing the flexibility of power systems, and ensuring the safe and stable operation of power grids. It also helps to accelerate the establishment of a new type of power system centered on new energy sources, increases the proportion of clean energy in energy consumption, and promotes a transition toward a greener and lower-carbon energy structure.