POWER GRID STABILITY IN SMALL WORLD PERSPECTIVE

摘要: The power grid which is designed to function as a network vulnerable physical and cyber disruption. sources of vulnerability include natural disasters, equipment failures, human errors, or deliberate sabotage attacks. As the grids become heavily loaded with long distance transmission, complex system even more we have observed in several massive outages last decade. In system, simple incident such an failure line touching tree can lead cascaded sequence events, leading widespread blackouts. grid, unconcerned most public time when it operating normal condition, gets attention only occur. shown Table I, there were major US three decades [1, 2]. Additionally, August 2003, greater outage occurred North-eastern United States. However, since our research on small world perspective started 2002, 1996 outage, vivid greatest disaster reliability at that time, was main focus paper. Actually, twice, apart by about month. On July 2, short circuit 345-kV Wyoming chain events break-up western North America resulted five islands blackout southern Idaho loss 11,750MW load. 10, Western Systems Coordinating Council (WSCC) into four 30,390 MW load affecting 7.49 million customers [3]. general, generators systems are always subject periodic disturbances, e.g., variations steady state, swings other transient so on. response these impacts oscillatory. If oscillations damped, after sufficient has elapsed deviation change state due impact (or less than some prescribed finite amount), stable. If, hand, grow magnitude sustained indefinitely, unstable. When stability investigated, often convenient assume disturbances causing changes disappear. Stability then assured if returns its original state.