A Co-ordinated Real and Reactive Power Control Architecture of a Grid-Connected Hybrid Offshore Wind-Wave Energy Conversion System
Conference Record - IAS Annual Meeting (IEEE Industry Applications Society)
This paper proposes a novel real and reactive power control architecture for the hybrid offshore wind-wave energy conversion system. A doubly-fed induction generator (DFIG) and a linear generator are deployed for harnessing the wind and wave energy, respectively. However, the designed control architecture is presented for the coordinated power control by considering the reactive power capability of the DFIG and including the dynamics of the linear generator in the control scheme. Additional current limits are enforced on the back-to-back converters, as these are going to handle the current injected by the linear generator along with the regular DFIG current. The reactive power support to the grid in the events of contingencies is included in the proposed control architecture. An adaptive reactive power-voltage (Q-V) characteristics-based scheme is included for the grid support. In the case of contingencies, the active power is curtailed and the maximum and the minimum limits for the reactive power are identified from the reactive power capability curve. Thereafter, adaptive Q-V characteristics based on dynamic droop gains are evaluated depending upon the required voltage support. The results obtained suggest the effectiveness of the proposed control architecture for the unique wind-wave energy conversion system.
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