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The voltage unbalance can introduce the torque ripples for a doubly fed induction generator (DFIG), which may bring the stress on the drive train. Thus, this paper proposes a direct power control (DPC) strategy of a DFIG for torque ripples suppression under unbalanced grid voltage conditions. Under the unbalanced grid voltage conditions, the stator reactive power pulsations are proportional to the...
This paper presents an analysis and control design of a permanent magnet synchronous generation (PMSG)-based wind generation system operating under unbalanced network conditions. A proportional-resonant current controller using stationary-frame is applied for current control of the system to achieve the control target of eliminating the negative sequence current input into the grid supply network...
This paper proposes an improved predictive current control scheme for grid-connected DC-AC voltage source converters (GC-VSCs) when the grid voltage is unbalanced. The control scheme is based on space vector modulation (SVM) technique and implemented in the stationary reference frame without involving any current-sequential decomposition process. Due to the requirement for controlling the ac terms...
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