Single-Phase Fundamental Component Estimation and Frequency Tracking Under Time-Varying Harmonic Distortion Operation

A scheme for combined fast frequency tracking and fundamental component estimation is proposed. Comparison of performances under time-varying harmonic distorted grid measurements operation is also discussed. The approach is based on a modification of the so-called Adaptive Quadratic Signals Generator Phase-Locked Loop, adding a pre-filtering stage in order to attenuate the influence of the time-varying harmonics. The time discretization strategy is also presented. Experimental tests of the algorithms are carried out using a dSPACE platform, and measurements validate the proposals.