Study of dynamic responses of an interconnected two-area all thermal power system with governor and boiler nonlinearities using BBO

This paper aims to investigate the application of biogeography based optimization (BBO) technique to load frequency control (LFC) problem for improving power system dynamics with governor dead band and boiler dynamics type of nonlinearities. Two-area all thermal types interconnected power system network is considered for design and analysis purpose. The thermal areas are equipped with single and double reheat turbine, simultaneously. The designed problem is considered as an optimization problem and BBO algorithm is applied to search optimal gains of classical PID-controller which is used in AGC problem. The behavior of the test system is also investigated with the analysis towards the different cost functions such as integral square error (ISE) and integral time absolute error (ITAE). Small load perturbation (SLP) is considered in area-1 for studying the dynamic behaviors of the designed power system unit. To validate the effectiveness and superiority of proposed controller, the performances are compared with the results obtained by differential evaluation (DE) and particle swarm optimization (PSO) techniques. Simulation study exhibits significant effect of the designed controller on the dynamics of concerned power system network.