IES_comparison_active_filters.pdf

L malesani and p mattavelli are with the department

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L. Malesani and P. Mattavelli are with the Department of Electrical Engineering, University of Padova, 35131 Padova, Italy. Publisher Item Identifier S 0278-0046(98)07019-1. The current control techniques [1]–[4] that have so far demonstrated the most effective performance in practical ap- plications to the control of active power filters are the lin- ear current control, the digital deadbeat control, and the hysteresis control. In principle, analog control techniques have the fastest speed of response, not being delayed by any A/D conversion process or calculation time. Among the digital solutions, the deadbeat control algorithm is known to ensure the best dynamic response. For these reasons and according to the practical experience, the two aforementioned analog techniques, that is, the linear current control and the hysteresis control, together with the digital deadbeat control, have been considered in this paper. Each of these have undergone a substantial evolutionary process, due their dif- fused industrial applications, so that the actually employed techniques indeed feature a large number of refinements with respect to the originally introduced versions. This paper is aimed at both summarizing the main implementation refine- ments which characterize the latest versions of the afore- mentioned control techniques and comparing the different performance [5], [6] achieved by the three current controls in a typical active filter applicative situation, considering the state-of-the art implementation of each one, so as to achieve simulated results which are as realistic as possi- ble. The organization of this paper is as follows. This paper initially focuses on the identification of proper criteria for correctly comparing the three controllers’ performance. Then, after a short description of the principles of the three control techniques and the presentation of the main refinements, the simulated system is briefly described. Finally, the results of the comparison, which is done according to the chosen criteria, are discussed. II. C RITERIA FOR C URRENT C ONTROLLERS ’ C OMPARISON A key point in the comparative evaluation of different control strategies, together with the selection of a realistic test situation, is the definition of suitable criteria [6] to evaluate the performance level offered by each of the considered techniques. In the case this paper deals with, that is, an active filter application, an immediate criterion for the control’s qual- ity evaluation seems to be the measurement of the total harmonic distortion (THD) of the line current waveform. This gives direct information about the control’s capability of eliminating harmonic pollution from the current drawn from the utility grid. As a matter of fact, the insight given 0278–0046/98$10.00 1998 IEEE
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BUSO et al. : CURRENT CONTROL TECHNIQUES FOR ACTIVE FILTER APPLICATIONS 723 by this measurement is rather poor, since all the various aspects of current regulation’s quality are lumped in a single figure. Therefore, two additional criteria are taken into account here.
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  • Fall '19
  • Current Source, IEEE Trans, Luigi Malesani

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