Composite system reliability evaluation using AC equivalent network

Network size is a main factor for computation time in composite power system reliability evaluation. This paper presents an evaluation method based on AC equivalent. The proposed method categorises a system into three main sections, i.e. internal area, boundary buses, and external area which will later be represented by an AC equivalent network. The method has been tested with the IEEE-RTS79 and IEEE-RTS96 of which the reliability indices of the whole system is evaluated and compared with those obtained from a completed enumeration analysis of the original network.