Abstract
The sensitivity information for reliability of composite generation and transmission system is useful for planning studies, as it can effectually identify the critical components and system ldquobottlenecksrdquo, thereby an important guiding can be offered for power system planning. The importance and necessity of conducting sensitivity studies on bulk power system reliability assessment have been increasingly recognized in recent years because of some fatal blackouts throughout the world, especially the August 14th blackout in the United States and Canada. This paper proposes a set of formulae which are defined as the partial derivation of the reliability indices such as loss of load probability (LOLP), loss of load frequency (LOLF) and expected demand not supplied (EDNS) with respect to components parameters such as availability, unavailability, failure rate and repair rate. By use of Lagrange multiplies for equality and inequality constraints in linear programming based optimal load shedding model, the partial derivation of EDNS with respect to component capacity is presented. The sensitivity analysis method is verified by the reliability evaluation for IEEE-RTS79 test system.
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