HARMONICS MEASUREMENT METHOD USING A DSP BASED ASIC

K. Fujino, K. Fukuo

Abstract

A compact, low cost harmonics measurement equipment, harmonics monitorTM, has been developed using a DSP based mixed signal ASIC. Each effective current harmonics from the basic frequency up to the 19^th order harmonics and the total harmonics distortion ratio can be obtained in real time. In stead of using a conventional FFT method a 6^th order, digital IIR filtering method was used for the accurate measurement. It allowed the computation to be in real time and the configuration of the main circuitry to be simplified into a single chip, thereby reducing the system cost. To compensate gain drop of ADC outputs over a continuous wide range of frequency the second order equalizing digital IIR filter was applied as well. The measurement accuracy has been realized within ± 0.5% of full scale from the basic frequency up to 19th order harmonics frequency.

Keywords

harmonics, total harmonics distortion ratio, 6th order IIR filter

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IMEKO-WC-2000-TC4-P126.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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