| 引用本文: | 游 力,熊亮雳,李震宇,等.基于构网型储能的独立电网同期并网技术研究及实证[J].电力系统保护与控制,2026,54(06):148-159. |
| YOU Li,XIONG Liangli,LI Zhenyu,et al.Research and demonstration of synchronization and grid-connection technology for islanded grids based on grid-forming energy storage[J].Power System Protection and Control,2026,54(06):148-159 |
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| 摘要: |
| 随着构网型储能的广泛应用，各级电网独立运行的场景日益增多，由于独立电网电压参数与大电网存在差异，须进行同期控制，以避免冲击电流导致的保护动作。提出了一种基于构网型储能的独立电网同期并网方法，通过单锁相环(phase-lock loop, PLL)锁相与有功闭环控制，实现独立电网电压相位精确跟踪，并在储能协调控制装置中实时生成有功、无功指令进行调节。并以国网湖北新港50 MW/100 MWh储能电站为例，对其进行了同期功能改造、算法部署及调试，并成功实施了含源网荷储的110 kV独立电网的同期并网。结果表明，并网时刻角差小于1°，频差小于0.005 Hz，压差小于0.5%。该方法具有改造成本低、安全可靠、应用范围广等优势，可为黑启动、故障恢复、微电网灵活组网等场景提供参考，具备良好的推广价值。 |
| 关键词: 构网型储能 独立电网 同期 锁相环 并网技术 |
| DOI：10.19783/j.cnki.pspc.250891 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(U24B20103) |
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| Research and demonstration of synchronization and grid-connection technology for islanded grids based on grid-forming energy storage |
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YOU Li1,XIONG Liangli1,LI Zhenyu2,XIONG Haozhe1,3,ZHANG Xing4,HAN Sicheng55
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1. State Grid Hubei Electric Power Research Institute, Wuhan 430077, China; 2. Hubei FYDL Electric Power Research Co.,
Wuhan 430077, China; 3. Hubei Key Laboratory of Regional New Power Systems and Rural Energy System Configuration,
Wuhan 430077, China; 4. NR Electric Co., Ltd., Nanjing 211106, China; 5. Chongqing University, Chongqing 400044, China
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| Abstract: |
| With the widespread adoption of grid-forming energy storage systems, scenarios involving independent operation of power grids are becoming increasingly common. Due to discrepancies in voltage parameters between islanded systems and the main grid, synchronization control is required prior to grid connection to prevent protection malfunctions caused by inrush currents. This paper proposes a synchronization and grid-connection method for islanded grids based on grid-forming energy storage. By utilizing a single phase-locked loop (PLL) and active power closed-loop control, precise phase tracking of the islanded grid voltage is achieved. Active and reactive power commands are generated in real time by the energy storage coordination control for regulation. Taking the State Grid Hubei Xingang 50 MW/100 MWh energy storage power station as a case study, synchronization function retrofitting, algorithm deployment, and on-site commissioning are carried out. Successful synchronized grid connection of a 110 kV islanded system integrating source, grid, load, and storage is achieved. The results demonstrate that at the instant of grid connection, the phase angle difference is less than 1°, the frequency deviation is below 0.005 Hz, and the voltage deviation is less than 0.5%. The proposed approach offers advantages such as low retrofitting costs, high reliability, and broad applicability. It provides a practical reference for scenarios such as black start, fault recovery, and flexible microgrid deployment, demonstrating significant potential for wider deployment. |
| Key words: grid-forming energy storage islanded grid synchronization phase-locked loop (PLL) grid-connection technology |
