System planning utilizing value based reliability approach

The main objective of this paper is to include the customer interruption costs in a reliability well-being assessment of sub transmission systems. This paper extends the well-being framework to include the societal worth of electric service reliability in subtransmission systems. System well-being is defined in terms of the three system states of healthy, marginal, and at risk, thus combining the deterministic and probabilistic approaches into a single framework. The paper discusses the determination of value based (worth) reliability indices of expected energy not supplied (EENS), expected cost of interruptions (ECOST), and Interrupted energy assessment rate (IEAR), for both the healthy and at risk states in the well-being framework. The concepts associated with extending the well-being framework to include reliability worth parameters are illustrated by application to a small reliability test system designated RBTS.