• Harmonics reduction in standalone DFIG-DC system by shunt active filter controlled in stator flux reference frame

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    • Keywords


      Doubly fed induction generator; standalone; DC voltage regulation; shunt active filter; harmonics control.

    • Abstract


      The presence of diode rectifier in standalone Doubly Fed Induction Generator-Direct Current (DFIGDC) system leads to considerable current, voltage and torque harmonics and requires reactive power from the machine. A unique shunt active filter arrangement is proposed for addressing these requirements. The DC Link ofDFIG-DC itself acts as input to shunt active filter and there is no requirement of creating and regulating a separate one. Since the stator flux reference frame is known in FOC of DFIG-DC system; the same can be used as PLL for thegeneration of current references for harmonics and reactive compensation in active filter control scheme. Hence, the AC voltage sensing is not needed in the proposed active filter control. In this paper, it is shown that current, voltageand torque harmonics are reduced with the help of shunt active filter, which have lower rating compared to the rotor side converter. The proposed scheme is verified by detailed experiments on a 5.5 kW slip-ring induction machine.

    • Author Affiliations



      1. Department of Electrical Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India
    • Dates

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