| 引用本文: | 周步祥,丁 豪,周 毅,等.基于角频率偏差积分反馈的构网型逆变器暂态稳定提升策略[J].电力系统保护与控制,2025,53(4):59-71. |
| ZHOU Buxiang,DING Hao,ZHOU Yi,et al.A transient stability enhancement strategy for grid-forming inverters based on integral feedback of angular frequency deviation[J].Power System Protection and Control,2025,53(4):59-71 |
|
| 摘要: |
| 针对构网型(grid-forming, GFM)逆变器在系统短路故障期间容易因失去平衡点而发生暂态失稳的问题，提出了基于角频率偏差积分反馈的GFM逆变器暂态稳定性提升策略。首先，建立了含电流限幅环节和角频率偏差积分反馈支路的GFM逆变器暂态稳定分析模型，分析了角频率偏差积分反馈系数对GFM逆变器暂态稳定的影响机理。其次，提出了角频率偏差积分反馈系数的设计方法，可以确保系统在故障期间具有稳定平衡点的同时，加速面积不大于减速面积，实现故障穿越。并且所提方法不需要获取系统功角、线路阻抗、电网电压跌落程度等信息。最后，基于Starsim硬件在环实验平台验证了所提策略的有效性。 |
| 关键词: 构网型逆变器 暂态稳定性 角频率偏差反馈 故障穿越 相平面图 |
| DOI：10.19783/j.cnki.pspc.240661 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(52307126)；四川省科技计划项目资助(2024NSFSC0870) |
|
| A transient stability enhancement strategy for grid-forming inverters based on integral feedback of angular frequency deviation |
|
ZHOU Buxiang1, DING Hao1, ZHOU Yi1, ZHANG Yan2, QIU Yiwei1, ZANG Tianlei1
|
|
1. College of Electrical Engineering, Sichuan University, Chengdu 610065, China; 2. Power Dispatching &
Control Center of Guizhou Power Grid Co., Ltd., Guiyang 550002, China
|
| Abstract: |
| To address the transient instability issue of grid-forming (GFM) inverters during short-circuit faults, which can lose their equilibrium point, this paper proposes a transient stability enhancement strategy based on integral feedback of angular frequency deviation. First, a transient stability analysis model of a GFM inverter is established, considering the current limitation and integral feedback branch of angular frequency deviation. The influence mechanism of the integral feedback coefficient of angular frequency deviation on the transient stability of GFM inverters is analyzed. Next, a design method for the integral feedback coefficient is proposed, one which can ensure that the system maintains a stable equilibrium point during faults while achieving fault ride-through by keeping the acceleration area no greater than the deceleration area. Moreover, the proposed method does not require obtaining information such as system power angle, line impedance, and depth of grid voltage sag. Finally, the effectiveness of the proposed strategy is verified through hardware-in-the-loop (HIL) experiments on the Starsim platform. |
| Key words: grid-forming inverters transient stability feedback of angular frequency deviation fault ride-through phase plane diagram |
