A Novel Controller for Model with Combined Lfc and Avr Loops of Single Area Power System

Literature survey shows that generally studies are made assuming the fact that there is no interaction between LFC and AVR loops. But the Automatic Voltage Regulation (AVR) and Load Frequency Control (LFC) loops are not in truest sense non-interacting. Practically, during dynamic perturbations some interactions between these two control loops exist. Interaction exists in opposite direction of the loops, or in simpler words, control actions in AVR loops which is a faster loop affect the magnitude of generator emf. Voltage fluctuations can be controlled by adjusting the exciter winding of the generator [126]. As internal emf determines the magnitude of real power, it is clear that changes in AVR must be felt in LFC loop [126, 127]. Combined model for LFC and AVR was first studied with PI controller in paper [6] for the first time. We have extended this work with the controller based on hybrid of Neural Network (NN) and Fast Traversal Filter (FTF) based controller (explained in chapter 5). Thus, in this chapter a study is done by incorporating the proposed controller in the combined model (LFC and AVR). Dynamic behavior of transients is improved as shown in the simulation results by the proposed controller. Finally, simulation results of the proposed controller are compared with model of combined loops (LFC and AVR) and LFC loop alone. Simulated results also show that there is interaction between LFC and AVR loops.