Impacts of Uncertain Geomagnetic Disturbances on Transient Power Angle Stability of DFIG Integrated Power System

When geomagnetic disturbances (GMDs) occur, the reactive power loss (GIC-Q) caused by geomagnetically induced currents (GICs) flowing through transformers can lead to system instability. Previous studies have been focused on impacts of GMD static stability conventional systems, while transient hybrid systems left unexplored. In this article a based wind and energy sources are proposed as research object. The farm output GIC-Q equivalent grounding impedance. Considering uncertainty GMD, establishing random fuzzy model fields, expected value critical clearing angle acceleration/deceleration area is calculated using credibility theory. Then influence under different proportions analyzed quantitatively margin. Taking Mengdong grid four operation modes an example, results show that no matter which mode, reduced when GMDs occur. Under heavy loading conditions in summer proportion reaches 50%, lowest. provide basis for disaster prevention control GMDs.