A framework for incorporating voltage and transient stability considerations in well-being evaluation of composite power systems

This paper presents a security-based approach to evaluate the well-being of customer load points in a composite generation and transmission power system. In this context, acceptable deterministic criteria are included in the probabilistic evaluation of composite generation and transmission load point reliability indices to monitor the well-being of different system load points. The degree of load point well-being is quantified in terms of the healthy state indices as well as the traditional risk indices. The well-being indices are evaluated considering three sets of constraints namely, steady-state, voltage stability and transient stability. The consideration of voltage stability, which is a local phenomenon, has a significant impact on the individual load point indices. The individual well-being indices of the different system load points can be aggregated to produce system indices. The performance of the overall power system under system faults is a major factor in the power system planning, operation and design stages and, therefore, the inclusion of an appropriate transient stability constraint will lead to a more accurate appraisal of the overall power system well-being.