Multi-Area Reliability -- A New Approach

Transmission interconnections can improve power system reliability, and this reliability improvement can be measured by the change in loss of load probabilities (LOLP's) . This paper presents a new method for evaluating loss of load proba bilities for an interconnected multi-area system. This method is based upon a reduced set of demand-supply feasibility conditions. This reduced set of feasibility conditions are used to directly define the infeasible region without iterative state space decomposition. LOLP's are then evaluated by attributing the probabilities of infeasible states to the appropriate reliability indices. The simulation results of a sample four-area system with 9,068,544 capacity states are presented in this paper. The computational efficiency of the proposed method is also illustrated in this paper.