Control of a Back-to-Back Two-Level/Five-Level Grid Connection of a Wind Turbine
AbstractThis paper proposes a new space vector modulation (SVM) technique to control the grid-side inverter for improving the output power quality of a doubly-fed induction generator (DFIG)-based wind energy conversion system (WECS). A five-level cascaded H-bridge inverter (CHBI) was used to connect the DFIG to the grid. The SVM algorithm enables control of the inverter of the DFIG to improve the quality of the output power by reducing the total harmonic distortion (THD) of the generated currents and the power ripples. However, the multilevel inverter has a major drawback, the even-order harmonics production, which can be overcome by controlling the five-level CHBI by using this new SVM technique generalized to N-level. The paper further presents the mechanism of this algorithm and a method to deduce the trajectories from the sequences, enabling reduction of the time and number of commutations, a better performance among several possible trajectories and reduction of the THD rate of the DFIG output currents.
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