A real-time selective harmonic extraction approach based on adaptive notch filtering

This paper introduces a new adaptive notch filtering approach as a selective harmonic extraction technique. This method is capable of detecting a selective order of harmonics. This feature is useful where elimination of certain harmonics is of concern. Moreover, the proposed method can successfully detect and track the variations in the frequency and amplitude of the signal and extract the time-varying harmonics. The theoretical analysis is presented and the performance of the method is evaluated by applying it on a shunt active power filter (APF). The methodology is applicable for a wide range of equipment like uninterrupted power supplies, regenerative converters, active power filters, etc.

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