A DSP controlled resonant active filter for power conditioning in three-phase industrial power systems

This paper presents a DSP controlled resonant active filter for power conditioning in three-phase industrial or commercial power systems. The active filter is designed to cancel lower-order harmonics generated by nonlinear loads using a series resonant LC tank tuned to a high frequency along with a pulse-width modulated (PWM) rectifier topology. The PWM control of the active filter allows for independent control of lower-order harmonics to efficiently cancel load-generated harmonics for power quality improvement. The active filter control algorithm is simulated in MATLAB and the real-time harmonic cancellation process is implemented on a DSP and verified through experimental results.

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