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Techniques of active load's current or/and power computing for dynamic compensation of three-phase symmetrical system

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4 Author(s)
Dobrucky, B. ; Zilina Univ., Nova Dubnica, Slovakia ; Pokorny, M. ; Roch, M. ; Havrila, R.

The paper deals with computing techniques of both active current and power, and their DSP implementation for dynamic compensation of three-phase symmetrical system. The dynamic power active filter using this techniques is determinated for the VAr and higher harmonics compensation of symmetrical nonharmonic/nonlinear loads. The new original concept, which has been used, is the creation of a complex vector of investigated quantities and its hardware decomposition into real- and imaginary components using Clarke orthogonal transform. The analysis can be completed within one sixth of the period for three-phase system (from acquired data of previous sixth), due to six-side symmetry of complex vector. The compensator response to the actual state of the load is then very fast. Discrete Fourier transform and/or numeric solution of active power computation are used for generating new reference data for each successive sixth of the period. The computation-mainly integration can be done by either fast digital signal processor or mixed (analog) signal unit. Simulation experiments in DesignLab environment are presented at the end of the paper

Published in:

Power Electronics and Variable Speed Drives, 1998. Seventh International Conference on (Conf. Publ. No. 456)

Date of Conference:

21-23 Sep 1998

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