Dispatchable power from DFIG based wind-power system with integrated energy storage

With increasing penetration of wind power, there is rising need to manage its intermittency. This paper explores the control and operational aspects of integrating a short and long-term storage mix, consisting of a fuel-cell, an elcetrolyzer and an ultracapacitor, into the double-fed induction generator based wind-power system, making it dispatchable. The fuel-cell/electrolyzer is employed to provide long-term energy balance by utilizing H2 as medium, whereas the ultracapacitor is employed as a buffer storage for the transient compensation. The control scheme enables the integrated system to operate seamlessly in islanded and grid-connected modes, fulfilling the operational requirements. System configuration is proposed, control scheme is designed, and the detailed dynamic modeling is developed for each component of the system. Expected behaviors during the sudden load change and wind variations are observed by mathematical simulation. Finally, the results of the analysis are summarized with their applicability to real system and the limitation/further scope are indicated.

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