Frequency estimation for grid-connected converters under time-varying harmonics and inter-harmonics

E.B. Kapisch, C.A. Duque, G. Tibola, J.L. Duarte

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Abstract

In order to allow the power flow control of grid-connected converters, this paper presents an improved scheme for grid fundamental frequency tracking. A comparison under frequency variation and time-varying harmonic and inter-harmonic condition is also discussed in order to show the method robustness. The scheme is based on a frequency-locked loop operating integrated with a decomposition core, which utilizes a recursive implementation of a modified Hanning filter. The frequency value information is used to perform the modulation and demodulation required to make de decomposition into the core. The compared frequency estimation scheme is based on a zero-crossing with an interpolation correction. Simulation results show that the proposed scheme is able to estimate the fundamental component, including relative quadrature companion signal and the frequency value more accurately and stably than the scheme used to perform the comparison.

Original languageEnglish
Title of host publication2018 IEEE 23rd International Workshop on Computer Aided Modeling and Design of Communication Links and Networks, CAMAD 2018
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Number of pages6
ISBN (Electronic)9781538661512
DOIs
Publication statusPublished - 29 Oct 2018
Event23rd IEEE International Workshop on Computer Aided Modeling and Design of Communication Links and Networks, CAMAD 2018 - Barcelona, Spain
Duration: 17 Sept 201819 Sept 2018

Conference

Conference23rd IEEE International Workshop on Computer Aided Modeling and Design of Communication Links and Networks, CAMAD 2018
Country/TerritorySpain
CityBarcelona
Period17/09/1819/09/18

Keywords

  • frequency-locked loop
  • Fundamental component estimation
  • time-varying harmonics and inter-Harmonics
  • zero-crossing

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