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Measurement of harmonics/inter-harmonics of time-varying frequencies

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2 Author(s)
M. Karimi-Ghartemani ; Dept. of Electr. & Comput. Eng., Univ. of Toronto, Ont., Canada ; M. R. Iravani

A novel method of extraction and measurement of individual harmonics of a signal with time-varying frequency is presented. The proposed method is based on a nonlinear, adaptive mechanism. Compared with the well-established techniques such as DFT, the proposed method offers (i) higher degree of accuracy, (ii) structural/performance robustness, and (iii) frequency-adaptivity. The structural simplicity of the algorithm renders it suitable for both software and hardware implementations. The limitation of the proposed method as compared with DFT-based methods is its slower transient response. Based on simulation studies, performance of the method is presented and its accuracy and response time are compared with a DFT-based method.

Published in:

IEEE Transactions on Power Delivery  (Volume:20 ,  Issue: 1 )