Committee: 

Dr. Meliopoulos, Advisor        

Dr. Grijalva, Chair

Dr. Saaedifard

Abstract:

The objective of the proposed research is to develop a time domain analysis scheme for Geomagnetically Induced Current  (GIC) analysis. Compared with existing methods which are based on simplified power flow, the time domain method is able to capture the transients during the onset and retreat of Geomagnetic Disturbance (GMD). It is also capable to precisely analyze the harmonic component resulting from saturations of iron cores in transformers and reactors. In this study, a detailed time domain analysis scheme is developed, which consists of frequency dependent circuit models, magnetic circuit models with nonlinear reluctance for iron core devices. This scheme is utilized to study several fundamental aspects during GMD events, including the harmonic spectrum of transformer current, the increase of reactive power consumption, and the instrumentation channel error due to DC offset.