311. Large-scale intelligent distributed battery energy storage system technology
[Area of Industry] High-end Equipment
[Name of Central Enterprise] China Huaneng Group Co., Ltd.
[Results Summary]
Applications: 1. Energy storage system for new energy power plants; 2. Frequency regulation retrofit for thermal power plants; 3. Independent energy storage power plants.
Features: 1. The newly proposed distributed battery energy storage architecture eliminates inter-cluster circulating currents and the resulting safety risks and losses, overcoming the "weakest link" effect in battery systems and increasing usable capacity by approximately 7%. 2. The developed novel EMS enables active energy balancing control and automatic SOC calibration for each battery cluster, improving cluster consistency and system cycle life. Two-stage and single-stage modular PCS suitable for distributed architectures were developed, achieving efficiencies exceeding 99%. 3. A cell-level intelligent pre-diagnosis technology based on big data throughout the entire cell lifecycle was created. This enables early identification of cell-level faults; a standardized pre-diagnosis cabinet was developed, enhancing the initiative and intelligence of operation and maintenance.
Technology maturity: Applications cover the power generation side and independent energy storage power stations, with a contract value of approximately RMB 600 million and an installed capacity of over 400 MWh.
Key Indicators
1. Inter-cell circulation: Not present.
2. System average efficiency: approximately 88% (discharge/charge); System capacity availability: ≥ 92%
3. System availability under fault conditions: 98.3% (taking a 10MW system with each PCS of 166.7kW as an example)
4. Fault Early Warning: Early fault warning at the cell level; SOC Calibration: Automatic calibration.
5. Battery system cycle life: Extended; Mixing of new and old battery packs: Supported.
[Application Promotion Needs]
1. Application promotion method: Sales
2. Application and Promotion Areas: 1. Energy storage systems for new energy power plants such as photovoltaic and wind power; 2. Upgrades of thermal power plants to enhance peak shaving and frequency regulation capabilities; 3. Independent energy storage power stations on the grid side; 4. User-side energy storage; 5. Grid-side energy storage.
