Amélioration de l’amortissement des oscillations de puissance du réseau électrique avec les dispositifs FACTS et les mesures à distance

Abstract

This thesis studies the analysis and design methods for power system global damping controllers to stabilize the most critical electromechanical oscillations. We adopt a common hierarchical structure, in which the global controller operates on top of local controllers. For this structure, it is desirable that the global loop improves damping of the most critical oscillations while having little impact to other power system dynamics. To meet this objective, we propose a special control scheme that utilizes bang bang modulation and online identification to suppress the critical oscillation. This approach allows to maximize the control effort and minimize interaction problems at the same time. A robustness analysis for this special control scheme is also proposed, to measure its robustness to change in operating conditions and time delay. This robustness analysis framework is also applicable to all types of linear power swing damping controllers. An important result from this framework is that we can analyze the link between time delay and the degradation of damping of some oscillation modes. An analysis of control loop selection for the global controllers is also proposed in this work. A new modal interaction index, which allows quick and easy classification of global control loops by their degree of interaction, is proposed.

Date	24 Jan 2011
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Louis-A. Dessaint (Supervisor) & Aimé Francis Okou (Co-supervisor)