Robust Stability based PI Controller Design with Additive Uncertainty Weight for AGC (Automatic Generation Control) Application

Robust control has emerged as a new field of control engineering research that primarily deals with obtaining system robustness in presences of uncertainties. In this paper, a graphical design method for obtaining the entire range of PI controller gains that robustly stabilize a non reheat AGC plant in presence of additive uncertainty is discussed. This design method mainly depends on the frequency response of the system which can serve to reduce the complexities involved in plant modelling. We have applied our design method to a single area non-reheat steam generation unit. The results were found satisfactory and robust stability was achieved for the said plant.