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Hierarchical Wide-Area Control of Power Systems Including Wind Farms and FACTS for Short-Term Frequency Regulation

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4 Author(s)
Leon, A.E. ; Inst. de Investig. en Ing. El ctrica (IIIE) Alfredo Desages, Univ. Nac. del Sur, Bahia Blanca, Argentina ; Mauricio, J.M. ; Gomez-Exposito, A. ; Solsona, J.A.

In this work a hierarchical scheme is proposed for the coordinated control of conventional synchronous generators, wind farm converters and flexible ac transmission systems. It comprises two levels, namely a fully decentralized set of controllers associated with the involved devices and a centralized coordinating controller based on synchronized wide-area signals provided by phasor measurement units. The proposed hierarchy of controllers is mainly focused on two objectives: transient frequency support and inter-area oscillations damping. Several works have recently proved that the fast-acting power converters of variable-speed generators can greatly improve the short-term frequency regulation capability in scenarios with a large penetration of wind energy. A case study is included showing that the dynamic performance and stability of power systems can indeed be enhanced when windmill converters are properly coordinated via a wide-area centralized controller.

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Power Systems, IEEE Transactions on  (Volume:27 ,  Issue: 4 )