International Journal of Computational Intelligence Research

This paper describes the Automatic Generation Control (AGC) of interconnected reheat thermal system using Proportional - Integral (PI) and extended Proportional - Integral (extended PI) and Fuzzy Logic Controller (FLC). The extended PI controller is used to reduce the peak over shoot and settling time error in the past. The action of this controller provides satisfactory operation when compared to the PI scheme even with the consideration of non-linearity such as Generation Rate Constraint (GRC). This extended PI controller is greatly dependent on the decaying factor. The value of decaying factor should be carefully chosen otherwise it greatly affects the control performance. To overcome this drawback Fuzzy Logic Controller has been employed in the system. The aim of the FLC is to restore the frequency and tie-line power in very smooth way to its nominal value in the shortest possible time, if any load change occurs. The performance of FLC has been compared with PI and extended PI control in the presence of Generation Rate Constraint (GRC). System performance is examined considering 1% step load perturbation in either area of the system.