Abstract:
This paper proposes an open-loop frequency estimator
(FE), with high harmonic rejection potential and a good dynamic
response. First, the Sliding Goertzel Transform (SGT) is utilized
to extract the orthogonal components that provide the means for
evaluating the phase angle. The output angle of the SGT is further
processed using the differentiation filter to estimate the frequency
under the adverse conditions. The efficacy of the proposed FE is
established after rigorous testing under various prevalent
MicroGrid-level harmonic, interharmonics polluted, dynamic test
signals. The performance of the proposed FE is also compared
with four other existing FEs, and the results are found to be very
encouraging. Furthermore, the proposed FE is implemented on the
dSPACE MicroLabBox, validating its excellent performance
through various experimental results.