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A unified method for signal parameter estimation of arbitrarily distorted single-phase grids with DC-offset

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posted on 18.05.2020 by Christoph Hackl, Markus Landerer
A unified method is presented which allows to
estimate all harmonic components, DC-offset and fundamen-
tal frequency in arbitrarily distorted single-phase grids us-
ing a frequency-adaptive observer (FAO) consisting of modi-
fied Second-Order Generalized Integrators (mSOGIs), a DC-
Integrator (DCI) and a modified Frequency Locked Loop
(mFLL). DCI and mSOGIs are tuned by pole placement which allows for an arbitrarily fast detection of DC-offset and harmonic components if the fundamental frequency is known. If the fundamental frequency must be estimated as well, a mFLL with Gain Normalization (GN), Rate Limitation (RL), Anti-Windup (AW) strategy and low-pass filters (LPF) must be employed. The effectiveness of the proposed FAO is validated by experimental results and its enhanced performance is shown by comparisons
to existing estimation methods.

History

Email Address of Submitting Author

christoph.hackl@hm.edu

ORCID of Submitting Author

0000-0001-5829-6818

Submitting Author's Institution

Munich University of Applied Sciences

Submitting Author's Country

Germany

Licence

Exports