Self-commissioning notch filter for active damping in three phase LCL-filter based grid converters

Rafael Pena-Alzola, Marco Liserre, Frede Blaabjerg, Tamas Kerekes

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

13 Citations (Scopus)

Abstract

LCL-filters are used to mitigate the harmonic current content in grid converters. The LCL-filter resonance must be damped in order to avoid stability problems in the current control. Active damping avoids resistors at the expense of increased control complexity. Large grid impedance variations can challenge the LCL-filter stability. Active damping by using a notch filter on the reference voltage for the modulator is simple to implement and does not require additional sensors. With the notch frequency tuned for the resonant frequency the voltage reference does not contain any component susceptible of exciting the LCL-filter. However, the notch filter tuning requires considerable design effort and the variations in the resonance frequency limit the LCL-filter robustness. This paper proposes a simple tuning procedure for the notch filter that results in proper robustness. In order to cope with the grid inductance variations it is proposed to estimate the resonance frequency by means of Fourier analysis. The Goertzel algorithm, instead of the FFT, is used to reduce the calculation and memory requirements. Thus, the proposed self-commissioning notch filter results robust and consumes little computational resources. Finally, the analysis is validated with both simulation and experiments.

Original languageEnglish
Title of host publication2013 15th European Conference on Power Electronics and Applications, EPE 2013
Place of PublicationPiscataway, N.J.
PublisherIEEE
Number of pages9
ISBN (Print)9781479901166
DOIs
Publication statusPublished - 17 Oct 2013
Event2013 15th European Conference on Power Electronics and Applications, EPE 2013 - Lille, France
Duration: 2 Sep 20136 Sep 2013

Conference

Conference2013 15th European Conference on Power Electronics and Applications, EPE 2013
CountryFrance
CityLille
Period2/09/136/09/13

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Keywords

  • Active damping
  • Autotuning
  • Converter control
  • Pulse Width Modulation (PWM)

Cite this

Pena-Alzola, R., Liserre, M., Blaabjerg, F., & Kerekes, T. (2013). Self-commissioning notch filter for active damping in three phase LCL-filter based grid converters. In 2013 15th European Conference on Power Electronics and Applications, EPE 2013 [6631962] Piscataway, N.J.: IEEE. https://doi.org/10.1109/EPE.2013.6631962