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| A transient stability enhancement strategy for grid-forming inverters based on integral feedback of angular frequency deviation |
| DOI：10.19783/j.cnki.pspc.240661 |
| Key Words:grid-forming inverters transient stability feedback of angular frequency deviation fault ride-through phase plane diagram |
| Author Name | Affiliation | | ZHOU Buxiang1 | 1. College of Electrical Engineering, Sichuan University, Chengdu 610065, China
2. Power Dispatching &
Control Center of Guizhou Power Grid Co., Ltd., Guiyang 550002, China | | DING Hao1 | 1. College of Electrical Engineering, Sichuan University, Chengdu 610065, China
2. Power Dispatching &
Control Center of Guizhou Power Grid Co., Ltd., Guiyang 550002, China | | ZHOU Yi1 | 1. College of Electrical Engineering, Sichuan University, Chengdu 610065, China
2. Power Dispatching &
Control Center of Guizhou Power Grid Co., Ltd., Guiyang 550002, China | | ZHANG Yan2 | 1. College of Electrical Engineering, Sichuan University, Chengdu 610065, China
2. Power Dispatching &
Control Center of Guizhou Power Grid Co., Ltd., Guiyang 550002, China | | QIU Yiwei1 | 1. College of Electrical Engineering, Sichuan University, Chengdu 610065, China
2. Power Dispatching &
Control Center of Guizhou Power Grid Co., Ltd., Guiyang 550002, China | | 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 |
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| 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. |
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