Robust technique for accurate estimation of single-phase grid voltage fundamental frequency and amplitude
- Author(s): Md. Shamim Reza 1 ; Mihai Ciobotaru 1 ; Vassilios Georgios Agelidis 1
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View affiliations
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Affiliations:
1:
Australian Energy Research Institute and School of Electrical Engineering and Telecommunications, The University of New South Wales, Kensington, Sydney 2052, NSW, Australia
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Affiliations:
1:
Australian Energy Research Institute and School of Electrical Engineering and Telecommunications, The University of New South Wales, Kensington, Sydney 2052, NSW, Australia
- Source:
Volume 9, Issue 2,
29 January 2015,
p.
183 – 192
DOI: 10.1049/iet-gtd.2014.0107 , Print ISSN 1751-8687, Online ISSN 1751-8695
This study proposes a robust technique for accurate estimation of single-phase grid voltage fundamental amplitude and frequency. The technique relies on a quadrature signal generator (QSG) based on a fixed frequency tuned second-order generalised integrator (SOGI) and an infinite-impulse-response differentiation filter (DF). The DF is used to estimate the fundamental frequency from the instantaneous phase angle obtained from the generated orthogonal voltage waveforms. The estimation technique is robust and offers an easy tuning process as there is no interdependent loop between the orthogonal voltage system and the frequency estimation. Additionally, the technique is computationally efficient and can also reject the negative effects caused by the direct current offset and harmonics. Furthermore, the frequency estimation is less sensitive to harmonics when compared with a similar technique relying on the QSG based on the fixed frequency tuned SOGI and least-squares method. Simulation and real-time experimental results are provided to validate the robustness of the proposed technique.
Inspec keywords: frequency estimation; least squares approximations; IIR filters; power grids; signal generators
Other keywords: infinite-impulse-response differentiation filter; DF; direct current offset; instantaneous phase angle; fixed frequency tuned SOGI; single-phase grid voltage fundamental amplitude estimation; least-squares method; single-phase grid voltage fundamental frequency estimation; tuning process; generated orthogonal voltage waveforms; quadrature signal generator; robust technique; QSG; fixed frequency tuned second-order generalised integrator
Subjects: Filtering methods in signal processing; Other topics in statistics; Interpolation and function approximation (numerical analysis); Power systems
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