Enhanced LMS for Online Frequency Estimation under Wide Spectrum Disturbances

Moreira, Mariana Geny; Vale-Cardoso, Adriano S.; Martins, Carlos H. N.; Leles, Michel C. R.

doi:10.1109/iemcon.2019.8936287

Cited by 2 publications

(1 citation statement)

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“…As shown in Figure 1, the harmonics caused by nonlinear electrical appliances have been a major obstacle to accurate fundamental frequency measurement. To overcome this barrier, Moreira et al (2019) designed an online frequency estimation method based on an enhanced least mean square (LMS) method. The fundamental frequency measurement error is lower than 2 mHz under harmonic and inter-harmonic conditions.…”

Section: Introductionmentioning

confidence: 99%

A High-Precision and Wideband Fundamental Frequency Measurement Method for Synchronous Sampling Used in the Power Analyzer

et al. 2021

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In the dedicated high-precision power quality analyzer, synchronous sampling is required to reduce the effect of spectrum leakage produced by the discrete Fourier transform process. Thus, accurate fundamental frequency measurement is urgently needed. However, due to the harmonics and noise in the power signal, it is difficult to achieve the accurate fundamental frequency measurement. Moreover, with the wide application of high-frequency programmable power supply, the fundamental frequency is gradually increasing, which requires power analyzers to have the abilities of both high precision and a wide range of the fundamental frequency measurement. To solve these issues, a new fundamental frequency measurement architecture used in synchronous sampling is proposed. This architecture consists of a small-point fast Fourier transform module, spectrum refinement algorithm, and a multimodal optimization method to calculate the accurate fundamental frequency under large harmonic conditions. In the practical hardware platform results, this architecture has a large fundamental frequency measurement range from 20 Hz to 200 kHz with a relative error which is <0.004%. The wideband fundamental frequency measurement structure proposed in this article achieves high measurement accuracy.

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Section: Introductionmentioning

confidence: 99%