Modeling of Hydro-Thermal Interconnected System with Conventional and Novel Controller

For interconnection of two or more areas in power system, frequency should be maintained within the scheduled value, which can be achieved by employing one of the most prominent techniques called as Automatic Load Frequency Control (ALFC). In ALFC, the frequency can be controlled in three ways, namely Flat frequency regulation, Parallel frequency regulation and Flat tie-line loading. Among these controls, Parallel frequency regulation is commonly used method, because constant frequency can be maintained by equalizing the power generation with the power demand. The main aim is to reduce the oscillations or damping in the frequency and also the changes in tie-line power. In this paper, PI and PID controllers are used to improve both frequency and tie-line power responses for multi-area interconnected power system (which consists of Hydro-thermal generating system) and is developed based on the model predictive control. This paper presents a solution procedure to Load Frequency Control (LFC) of interconnected Hydro-Thermal system with a novel controller (PSO (Particle Swarm Optimization)).