PROJECT TITLE :
DC-link Control Filtering Options for Torque Ripple Reduction in Low Power Wind Turbines - 2017
Tiny wind energy conversion systems (WECSs) are turning into an attractive option for distributed energy generation. WECSs use permanent-magnet synchronous generators (PMSGs) directly coupled to the wind turbine and connected to the grid through one-section grid-tie converter. The loading made on the dc link is characterized by giant ripple currents at twice the grid frequency. These ripple currents are reflected through the dc bus into the PMSG, inflicting increased heating and ripple torque. In this paper, the PMSG inverter is used to manage the dc-link voltage. In order to avoid reflecting the ripple currents into the PMSG, the feedback dc-link voltage is more responsible a filter. The Butterworth filters, notch filters, antiresonant filter (ARF) and moving average filter (MAF) are thought of. For a honest comparison, formulas are provided to tune the filter parameters thus that dc-link voltage control can achieve the chosen bandwidth. The different filtering choices produce completely different levels of torque ripple reduction. The notch filter, ARF, and MAF obtain the simplest results and there's a tradeoff between the filter implementation complexity, bandwidth, overshoot, and also the torque ripple reduction. Simulations and experiments employing a a pair of.5-kW PMSG turbine generator validate the proposals.
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