Impact on Bulk Power System Reliability Performance And Voltage Security By Changing The States of System Network

This paper discussed the effect of states change of original network on reliability performance and voltage security with the objective to minimize the interrupted load of the system. Tap change of transformer, transmission line failure and generating unit failure refers as new states of the system. Probability related to every change of state are taken for reliability indices evaluation such as Expected Energy Not Supply (EENS), Delivery Point Unreliability Index (DPUI) and Loss of Load Probability (LOLP). MATLAB simulation with different states are used for evaluation of objective of this paper. Case studies are conducted on reliability Test System (RTS-79). Interrupted load occurs at the load buses when supply does not meet the demand. Expected load loss for the system evaluated based on the total available capacity during each states of the network. Interrupted load duration in times per year are also described in this paper which relates to reliability performance of system.