Abstract
This work presents an open-loop frequency estimator able to deal with typical disturbances, yet exhibiting fast dynamics. The proposal is tested and compared experimentally against the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">orthogonal voltage decomposition</i> OVD approach, which is considered the state-of-the-art open-loop frequency estimator and the recently proposed AFPLL. The results verify that the proposed approach operates correctly under unbalancing, harmonics, noise, and interharmonics, and after frequency, phase, and amplitude jumps, while exhibiting settling times about <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\mathbf {25\%}$</tex-math></inline-formula> better than the OVD, and a similar execution time. Furthermore, the proposed technique has a performance comparable to advanced <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">frequency-locked loops</i> , it is easy to tune, and thus, it could be seamlessly applied in typical synchronization tasks where PLLs are usually employed.
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