Análisis modal y transitorio de sistemas eléctricos con incorporación de energía eólica a gran escala
Fernando Berrutti
Master thesis from Facultad de Ingeniería, Universidad de la República - 2012
Advisor: Alvaro Giusto
Co-advisor: Michel Artenstein
Research Group(s): Energias Renovables (ger)
Department(s): (unspecified)
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Resumen

This thesis focuses on analyzing the changes suffered by the power systems dynamics due to the inclusion of wind farms, with particular emphasis on small signal stability. This phenomenon is discussed using three tools: in first instance, a theoretical analysis is made to establish the conceptual basis that will help to understand the addressed problem. Secondly, modal analysis is performed on the particular case of the Uruguayan transmission grid in order to verify the validity of the theoretical studies and providing specific information on the changes that occur in the dynamic structure of the power system. Finally, a transient analysis is performed to validate the small signal analysis and to recognize its limitations when the power system is subject to a severe disturbance. Taking this into account, it has been diagnosed the strengths and weaknesses that acquires the power system when wind power is integrated. This will allow to establish different methods to improve its transient performance. In this work is performed the diagnosis of the inclusion of wind power in the Uruguayan electrical grid and the application of two methods to mitigate and even improve the performance of the power system oscillatory behaviour in those cases that wind power present an adverse effect on the small-signal stability. These methods are based on taking advantage of the capacity of the variable speed wind turbines for decoupling the production of active and reactive power and decouple the speed of rotation of the generator respect the frequency electrical grid to which are interconnected. The first method lies in establishing operational constraints in the reactive power exchange between the wind farms and the grid in order to increase the synchronizing torque of the synchronous generators affected by their inclusion. The second method is to use a PSS in wind turbines to control de active power production and to induce them to behave dynamically as the synchronous generators whose damping is trying to increase, assisted by the use of synchrophasors. Finally, it is established that both methods can be applied simultaneously to improve the oscillatory performance of those synchronous generators adversely affected by the inclusion of wind power.

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