Load frequency control of an interconnected three-area thermal power system using conventional PID & Fuzzy-logic controller

This paper deals with design of automatic generation control (AGC) of a three-area interconnected thermal power system using conventional PID, PID-N & Fuzzy-PID controller structures. A single input Fuzzy Proportional Integral Derivative (FPID) controller is used to study the transient response of the proposed system. Area-1 & 2 1 consists of two thermal generating units with reheat turbinesand area-3 has one thermal generating units of non-linear turbine model with GRC unit. The gains of the proposed three controllers are optimized using novelhybrid Differential Evolution-Particle Swarm Optimization (DEPSO) technique. Step load perturbation (SLP) of 1 % is applied in area1 to study the performance of the proposed algorithm upon three controllers on as the three-areas in terms of undershoot, overshoot & settling time. Finally it is observed that the FPID controller optimised DEPSO algorithm performs better than the other two.