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Implementation of ADALINE on a DSP for real-time measurement of current harmonics

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The objective of this paper is to implement an ADAptive LINear Element (ADALINE) for real-time measurement of harmonics in load current waveform using a digital signal processor (DSP). Harmonics cause many ill effects and reduce power quality. Harmonics are being measured by fast fourier transform (FFT) algorithm executed on a microprocessor or DSP system. The FFT algorithm implemented as per international electrotechnical commission (IEC) 61000-4-7 requires 1,000 samples to be acquired from ten cycles for a 50 Hz-system. This paper presents the results of implementation of ADALINE algorithm on a DSP for measurement of harmonics in real-time. The proposed method requires acquisition of only 100 samples from one cycle of the load current. Thus the acquisition time in the proposed implementation reduces to 20 ms from 200 ms. The results obtained using the proposed method are found to be close to that of a standard FFT based power quality analyser.

Keywords: ADALINE, adaptive linear elements, DSP, digital signal processing, implementation, current harmonics, IEC-61000-4-7, IEEE:519

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