Maximizing Energy Extraction from Direct Grid Coupled PMSG For Wind Energy Conversion Systems
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2022
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Abstract
Direct grid coupling of permanent magnet synchronous generators (PMSG) for wind energy conversion systems provides certain advantages with the penalties of maximum power point tracking (MPPT) and reactive power control. This article proposes a novel PMSG design philosophy such that optimizing PMSG design at the initial stage would compensate for the drawbacks arising from the lack of an MPPT algorithm. Also, the ability to maintain a high PF across a wide range of operating power levels is investigated by considering reactive power in the design process. In this article, optimization of slot/pole combination is described for direct grid coupled PMSGs to extract as much energy as possible according to wind data. A new benchmark, adequacy factor, is presented to determine the slot/pole combination. Variation of the reactive power is theoretically analyzed. A relationship is established between induced electromotive force, synchronous inductance values of machines, and the PF. Fixed and variable speed operations of PMSGs are compared in terms of annual energy yield. Finally, theoretical analyses are validated through laboratory testing of prototype generators. © 1972-2012 IEEE.
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Keywords
Couplings , Electric machine control , Electric power factor , Electric power system control , Electric power transmission networks , Energy conversion , Maximum power point trackers , Permanent magnets , Power control , Reactive power , Wind effects , Wind power , Wind turbines , Blade , Generator , Optimisations , Permanent magnet generator , Permanent magnet synchronous generator , Power minimization , Reactive power minimization , Slot/pole optimization , Wind energy generation , Wind speed , Synchronous generators