IES_comparison_active_filters.pdf - 722 IEEE TRANSACTIONS...

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722 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 45, NO. 5, OCTOBER 1998 Comparison of Current Control Techniques for Active Filter Applications Simone Buso, Member, IEEE , Luigi Malesani, Fellow, IEEE , and Paolo Mattavelli, Associate Member, IEEE Abstract— This paper presents the comparative evaluation of the performance of three state-of-the-art current control tech- niques for active filters. The linear rotating frame current con- troller, the fixed-frequency hysteresis controller, and the digital deadbeat controller are considered. The main control innovations, determined by industrial applications, are presented, suitable criteria for the comparison are identified, and the differences in the performance of the three controllers in a typical parallel active filter setup are investigated by simulations. Index Terms— Active filters, current control, voltage-source inverters. I. I NTRODUCTION A S FAR AS THE quality of current control is concerned, parallel active filters represent an extremely demanding field of application for voltage-source pulsewidth modulation (PWM) converters. In fact, differently from what happens in the adjustable-speed drive or in the PWM rectifier applications, the current control of these devices is required to generate a current waveform which is normally characterized by a consid- erable harmonic content. As an example, a typical application of parallel active filters is represented by the compensation of controlled or naturally commutated rectifiers, especially for the so-called retrofit of existing plants. To compensate for the distorted current drawn by the rectifiers from the utility grid, the active filter and its current control must have the capability to track sudden slope variations in the current reference, corresponding to very high values, which makes the design of the control and the practical implementation of the filter particularly critical. To meet these dynamic requirements, a current-controlled voltage-source inverter (VSI) is a suitable solution. As far as the control is concerned, the variability of the frequency and amplitude of the voltage faced by the VSI in an ac drive or the current reference variations due to power absorption changes in a PWM rectifier, which may represent significant problems for those applications, are undoubtedly less critical requirements than those demanded by the filter applications. Therefore, it is in the active power filter application that the choice and implementation of the current regulator is more important for the achievement of a satisfactory performance level. Manuscript received April 29, 1997; revised June 1, 1998. Abstract pub- lished on the Internet July 3, 1998. S. Buso is with the Department of Electronics and Informatics, University of Padova, 35131 Padova, Italy.
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  • Fall '19
  • Current Source, IEEE Trans, Luigi Malesani

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