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Control of an Active Filter by Duty Cycle Modulation (DCM) for the Harmonic Decontamination of a Three-Phase Electrical Network

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Document pages: 14 pages

Abstract: This paper presents the control of the active filterby Duty Cycle Modulation (DCM) for the harmonic pollution control of athree-phase electrical system. Several research works have preceded this work,but most of them deal with the control by pulse-width modulation and thedifferences lie around the THD reduction performance, the quality of the waveobtained, the simplicity of the scheme and the cost of the control. For thispurpose, we propose a very innovative approach to active filter control whichaims at reducing the current THD at a lower rate than pulse-width modulationtechniques improving at the same time the wave quality with a more simplifiedcontrol scheme. First we present the schematic diagram of the active filter,then we present the design of the control of this active filter based on thereal and imaginary instantaneous power method which uses the algebraic “Clark”transformation. The Duty Cycle Modulation controller is used to obtain therequired control commands to be injected to the inverter. We then developed asimulink model of the active filter to validate this study. The simulationswere performed in the Matlab Simulink environment. The results obtained show asignificant improvement on the harmonic current control techniques for the THDof 1.02 which was 26.25 , the elimination of noise in the signal and thesimplicity of the control with an easier implementation than the pulse widthmodulation (PWM) make the Duty Cycle Modulation (DCM) control a very promisingtool.

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