Active Damping of LCL-Filter Resonance Using a Digital Resonant-Notch (Biquad) Filter

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Abstract

The LCL filter is a fundamental component which interfaces a voltage-source inverter (VSI) with a power grid, but on the other hand, it introduces a potential resonance risk which may be harmful to the system stability. In this paper, a digital biquad filter, which consists of a resonance and a notch, is proposed to damp the LCL resonance. By carefully tuning the resonance frequency and the notch frequency of the biquad filter, the LCL resonance is equivalently shifted from an unstable region into a stable one. The proposed method possesses a sensor-less benefit, and it can provide a high control bandwidth as well as a strong robustness. Experimental results acquired from a three-phase grid-connected inverter verify the effectiveness of the biquad filter.
Original languageEnglish
Title of host publicationProceedings of 2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)
Number of pages9
PublisherIEEE
Publication date30 Oct 2018
Pages1-9
Article number8515419
ISBN (Print)978-1-5386-4145-3
ISBN (Electronic)978-9-0758-1528-3
Publication statusPublished - 30 Oct 2018
Event20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe) - Riga, Latvia
Duration: 17 Sep 201821 Sep 2018

Conference

Conference20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)
CountryLatvia
CityRiga
Period17/09/201821/09/2018

Keywords

  • Active damping
  • Digital control
  • Pulse Width Modulation (PWM)
  • Robustness
  • Voltage Source Inverters (VSI)

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    Pan, D., Wang, X., Blaabjerg, F., & Gong, H. (2018). Active Damping of LCL-Filter Resonance Using a Digital Resonant-Notch (Biquad) Filter. In Proceedings of 2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe) (pp. 1-9). [8515419] IEEE. https://ieeexplore.ieee.org/document/8515419