Multi-sinusoidal signal estimation by an adaptive SOGI-filters bank

In this paper, a new method for frequency, amplitude and phase estimation of a multi-harmonic signal is proposed. The approach described herein uses an orthogonal signals generator based on a Second-Order Generalized Integrator (SOGI). The method is implemented as a dynamic third-order system, for each sinusoidal component, and has significant advantages over prior methods since it allows an on-line estimation of all unknown signal parameters. An adaptive tuning algorithm of the SOGI resonant frequency is shown in both cases of single-sinusoidal or multi-sinusoidal signal. The effectiveness of the proposed algorithm is demonstrated through simulated experiments and comparisons with existing methods.