Electrical & Computer Engineering, Department of


First Advisor

Professor Sohrab Asgarpoor

Date of this Version



A THESIS Presented to the Faculty of The Graduate College at the University of Nebraska In Partial Fulfillment of Requirements For the Degree of Master of Science, Major: Electrical Engineering, Under the Supervision of Professor Sohrab Asgarpoor. Lincoln, Nebraska: August 2014

Copyright © 2014 Veravut Dheraprasart


This thesis introduces and evaluates a new index called ”Expected Cost Penalty Due to Deviation From Security Constrained Dispatch” (ECP_SCD) for interconnected power systems planning. This index represents the optimal operating cost of the system taking into account the uncertainties such as random failure of generating units, transformer, and transmission lines in interconnected power systems. The significance of this index is that it represents the minimum operating cost for a contingency event and can be used for contingency screening (ranking). This index also indicates the impact of equipment reliability on the average cost penalty of all contingency events. Moreover, this index unit is in dollars per hour which makes it easier to understand for the power system operator. Monte-Carlo simulation and a normal Statistics Numerical Algorithms are used to evaluate this index. System studies are performed to determine the variation of expected cost penalty with respect to changes in load values, probability outage of components, and transmission line loading limit.

Adviser: Sohrab Asgarpoor