Interaction of Synchronous Generators Governors in Power Systems

Abstract

Power system stability is a fundamental concept which is involved in many studies. Nowadays, analysis of power systems is developed to include many other concepts and not to be limited to input mechanical power, output electrical power and load angle. It includes many sub definitions such as the natural frequency of the machine and the sub-synchronous resonance in addition to many other circumstances of the power system. This means that besides the associated electromagnetic behavior of the connected generators and their fluxes, electromechanical behavior will be mainly considered in this thesis. All the attention turns to the electromechanical behavior of the power system, the transient electromechanical behavior and all the relative concepts like inertia of all the connected rotating masses and the electrical forces connect the generator are considered the key point of its robustness against any sudden disturbance and the driving torques. To get the full picture of these concepts, many models are created and studied through the vast literature sources on power systems. This thesis is divided into two main parts: the sub-transient period and the transient period of operation and the effect of governor response. During the sub- transient period, natural frequency of a machine, associated with the synchronizing power, slip power and inertia power are considered the dominant factors affect the machine behavior. While in transient period, governors are taking all the action.