A New Multivariable Filter with Variable-Frequency Characteristics for Three-Phase Signal Processing

Simple Production of Effects by Filters Accompanied with Vector Rotators

Abstract

This paper proposes a new multivariable filter with variable-frequency characteristics for three-phase signal processing. The filter can make distinction between positive and negative frequencies of three-phase signals and can allow us to process the signals based on frequency polarity. The filter can also change dynamically its filtering characteristics by simply injecting a shift-signal to the filter. The filtering effects equivalent to ones by so-called the filters accompanied with vector rotators are obtained, but in much simpler manner. A unified analysis of attractive general characteristics of the multivariable filter is given for its easy designs and realizations as well. Effectiveness of the analysis and usefulness of the filter are examined and confirmed through experiments. The filter has potential to a variety of three-phase signal filtering applications.