TECHNIQUES FOR DESIGNING CONTROLLERS OF A MULTI-MACHINE SYSTEM

Abstract

In recent years considerable emphasis has been placed on the enhancement of dynamic stability of power systems. This involves the addition of external controller or compensators of the existing power plant. This thesis describes the application of different techniques including optimal control theory in the improving the dynamic stability of the multi-machine system. The complex power system is considered as a dual-level form of system representation, rather than a signle machine-infinite bus system. The pertinent small signal equations are derived and the state space model is developed. Different techniques including optimal control theory and its modifications and conventional "eigenvalue search" methods have been applied in designing different types of controllers in order to give improved system performance in the dynamic operating rang of a power system. A practical application involving the design of a controller for the Squaw Rapids Generating Station of Saskatchewan Power Corporation is used as a means of comparing the different techniques.