DefinePK

Abstract

This paper presents evaluation of Power System Restoration (PSR) Indices based on the Automatic Generation Control (AGC) assessment of two-area thermal reheat power system with FACTS devices in a restructured environment. These PSR indices indicate the ancillary service requirements to improve the efficiency of the physical operation of the power system with the increased transmission capacity in the network. In this study, a new control strategy the Proportional and Integral plus (PI+) controllers are designed using Krill Herd (KH) algorithm for solving AGC problem in power system. The PI+ controller uses a low-pass filter on the command signal to remove the transient’s response over shoot. In this way, the integral gain can be raised to higher values and PI+ controller is useful in applications for AGC loop. The recent advances in power electronics have led to the development of the FACTS devices such as Thyristor Controlled Phase Shifter (TCPS) and Static Synchronous Series Compensator (SSSC) are capable of controlling the network condition in a very fast and economical manner. The proposed PI+ controllers are designed and implemented in two-area unequal interconnected reheat thermal power plants with FACTS devices are considered for simulation study and their optimum settings are obtained using KH algorithm employing Integral Square Error based fitness function. From the simulations results, the incorporation of FACTS devices can enhance the total transfer capability and decrease the line congestion and to ensure improved PSR Indices in order to provide good margin of stability.