Processing Magnetometer Signals for Accurate Wide-Area Geomagnetic Disturbance Monitoring and Resilience Analysis

verfasst von: Mohamadreza Ariannik, Afshin Rezaei-Zare, Peter Werle
Abstract: Geomagnetic disturbances (GMDs) can disrupt the operation of power systems by inducing a quasi-dc voltage and generating geomagnetically induced currents (GICs) in a vast area of the power systems. This gives rise to the importance of wide-area monitoring of magnetic field on earth's surface. Assessment of power system resiliency against GMDs requires an accurate calculation of GIC flows, which is achieved by wide-area monitoring of the magnetic field B, and processing the B signals that are recorded by magnetometers on the earth's surface. In this paper, a method is proposed to denoise the B signal. Spikes in the signal are detected using a stationary wavelet transform and then replaced. Time derivative of B signal is taken by a continuous wavelet transform to prevent amplification of the noises. Furthermore, a quantitative analysis is performed to detect the optimum sampling frequency to overcome the practical limitations associated with transmitting the recorded B signal and to modify peaks of dB/dt signal negligibly. It is demonstrated that a sampling frequency of 1/15 Hz satisfies these conditions. Finally, GICs in a 118-bus benchmark power system are calculated with respect to a realistic geomagnetic storm to demonstrate the effectiveness of the proposed signal processing method.
Organisationseinheit(en): Fachgebiet Hochspannungstechnik und Asset Management (Schering-Institut)
Externe Organisation(en): York University
Typ: Artikel
Journal: IEEE Transactions on Power Delivery
Band: 36
Seiten: 2550-2558
Anzahl der Seiten: 9
ISSN: 0885-8977
Publikationsdatum: 18.09.2020
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Energieanlagenbau und Kraftwerkstechnik, Elektrotechnik und Elektronik
Elektronische Version(en): https://doi.org/10.1109/TPWRD.2020.3024908 (Zugang: Geschlossen)