volume | PIER Journals

Abstract

Focusing on the instability problems of power grid transformer caused by geomagnetically induced current (GIC), this paper investigates the multi-physics coupling characteristics of transformer under GIC. First, the propagation path of GIC is analyzed, and the variation characteristics are further studied based on measurement data. The variational signatures can be characterized by two key parameters: the GIC distortion rate (Δk) and the distortion time (t_τ). A multi-physics coupling model considering GIC distortion is proposed, which includes mechanical domain coupling between electromagnetic and acoustic domains. Simulations are conducted on a three phase transformer under varying conditions of distortion rate (Δk), distortion time (t_τ), and load factor (ƞ). Then the spatial-temporal variations of winding current, magnetic leakage, core vibration acceleration, and noise can be analyzed. Results reveal that vibration and noise exhibit abnormal intensification under GIC interference. Meanwhile, dynamic experimental platform is established. And the result is verified through consistency of virtual model and physical entity. On this basis, a nonlinear mapping relationship between distortion rate (Δk) and sound pressure level (L_p) is established. Finally, a stability criterion is developed, providing a foundation for situational awareness and full lifecycle management of grid equipment under GIC interference.

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Dr. Chao Pan

Mr. Chuanhui Wang

Dr. Tongrui Fu

Dr. Shoukun Zou