Aplicação de filtros adaptativos para a estimação da freqüência e da amplitude de inter-harmônicos causados por flutuação de tensão

Abstract

This paper presents a new method to quantify inter-harmonics, caused by voltage fluctuations, in terms of frequency and amplitude. The frequencies of the fundamental and fluctuation component are also estimated, which allows the application of the algorithm in the presence of frequency and amplitude variations. The proposed methodology uses adaptive notch filters with frequency estimators combined with demodulation techniques and moving average filters. Frequency and amplitude estimation results were reasonable, with small errors, in all scnearios, which supports the feasibility of the proposed method for time-varying inter-harmonic estimation.