The Influence of Geomagnetic Disturbance on Transient Power Angle Stability of Hybrid Systems

The reactive power loss of transformers (hereinafter referred to as GIC-Q) caused by geomagnetically induced current (GIC) has the characteristics of large total amount and strong fluctuation. As a kind of reactive load added to the system, GIC-Q can cause the change of operating state. The influence of geomagnetic disturbance (GMD) on system stability focuses on the static stability of conventional systems, and its influence on the transient stability of hybrid systems has not been studied. This study establishes the random fuzzy model of induced geoelectric field components and calculates the expected values of critical clearing angle and acceleration/deceleration area. And the transient stability margin is quantitatively analyzed considering the influence of GMD. The result shows that GMD deteriorates the transient stability of the system, and the transient stability margin is the smallest when the wind power access ratio is about 50%. The research results provide a basis for disaster prevention and control of GMD.