Assessment of Expected Customer Interruption Cost Due to Power System Contingency by Sensitivity Analysis

Cost/benefit analysis of power system is one of the most challenging task due to the impact of electric utility deregulation and market competition. However, it becomes an essential factor in order to determine the system reinforcement and expansion projects. A major role in the application reliability concepts and accomplishment of an acceptable level of reliability is economic. Therefore, it is important to determine the optimal reliability level at which the reliability investment achieves the best results in reducing the customer damage costs due to power supply interruption. This paper presents an assessment of reliability cost/benefit index of expected customer interruption cost (ECOST) by considering power system contingency which are load adjustment and transmission line tripping by applying the sensitivity analysis. ECOST index quantifies the reliability of power system in terms of monetary. The value of ECOST is evaluated based on load increment/decrement and transmission line tripping. In order to calculate ECOST, load curtailment is performed. IEEE Reliability Test System 1979 (IEEE RTS- 79) is used to validate the assessment of ECOST due to load adjustment and line tripping. The findings have proved that the ECOST increases with the increased of the total loading condition and line tripping. Therefore, this method could be applied in order to assist the power system utility in monitoring the contingency in the system.