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This paper investigates dc voltage control strategies for output power smoothing of a fully rated converter-based wind turbine with energy storage device connected to the common dc link via a bidirectional dc/dc converter. Since the dc link voltage ripple reflects power oscillation, coordinated dc voltage control schemes are used for the ac network side converter and energy storage system to ensure...
DC microgrid operation with variable sources is studied in this paper. A 3-level hierarchical DC voltage control is proposed which corresponds to grid connected operation, islanding operation, and load shedding / generation curtailment operation. The system operational status is verified according to voltage levels and corresponding control strategies are used according to voltage levels to secure...
This paper describes the use of voltage source converter (VSC) based, multi-terminal (MT) HVDC transmission system technology for connecting large doubly-fed induction generator (DFIG) based wind farms, over long distance. The operational principles of the proposed system are described and control strategies for coordinating various grid side converters are proposed, to ensure smooth system operation...
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