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This article presents the sub-optimal automatic generation control regulator designs of a two-area interconnected power system using output feedback control strategy. The power system consists of identical plants with reheat thermal turbines and is interconnected via parallel AC/DC links. Efforts have been made to propose sub-optimal automatic generation control regulators based on the feedback of output state variables, which may easily be accessible and available for measurement. In addition, the proposed regulators are designed using a modified area control error, which incorporates the DC tie-line power deviation in the modeling of area control errors. The system dynamic performance has been investigated with the implementation of designed sub-optimal automatic generation control regulators in the wake of 1% load disturbance in one of the two areas. Also, system dynamic responses with optimal automatic generation control regulators for the same power system model are obtained to compare the system dynamic response obtained with the proposed sub-optimal automatic generation control regulators.

In the Modern scenario, the naturally available resources for power generation are being depleted at an alarming rate; firstly due to wastage of power at consumer end, secondly due to inefficiency of various power system components. A Combined Cycle Gas Turbine (CCGT) integrates two cycles- Brayton cycle (Gas Turbine) and Rankine cycle (Steam Turbine) with the objective of increasing overall plant efficiency. This is accomplished by utilising the exhaust of Gas Turbine through a waste-heat recovery boiler to run a Steam Turbine. The efficiency of a gas turbine which ranges from 28% to 33% can hence be raised to about 60% by recovering some of the low grade thermal energy from the exhaust gas for steam turbine process. This paper is a study for the modelling of CCGT and comparing it with actual operational data. The performance model for CCGT plant was developed in MATLAB/Simulink.