Tuning of PID Controller in an Interconnected Power System using Particle Swarm Optimization

Abstract

This paper addresses the dynamic performance of Load Frequency Control (LFC) of four area interconnected power system. In this, area-1 consists of thermal plant, area-2 consists of thermal with reheat system, area-3 consists of hydro plant and area-4 consists of gas power plant. The proposed system is the combination of most complicated system like hydro plant, gas plant and thermal plant with reheat turbine are interconnected which increases the nonlinearity of the system. All the four areas are equipped with PID controller and the parameters of these PID controllers are optimized using Particle Swarm Optimization (PSO). The objective function taken into consideration is Integral Square Error (ISE). The performance of controller is simulated in MATLAB/SIMULINK software. The existing LFC systems assist the frequency and tie line power deviations to settle quickly with zero steady state error.