Abstract
A parallel active power filter for non-linear loads, its signal processing unit for single-and three-phase application, control principle and power stages are described. The filter current reference determination method, which provides reduction of the fundamental displacement reactive power and non-active distortion power for variable non-linear loads, is based on the combined analogue and digital signal processing. First, the load current is filtered by a precision analogue circuit. Further calculation of the filter current references in a single-and three-phase application is accomplished by microcontrollers. The implemented discrete-time triggering method and selected reactive elements in the filter's power stage provide fast response of the actual filter current to its reference. The results, obtained from experimental circuits, illustrate the active filter performance in steady state and during load current transients.
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