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.