Digital Low-Pass-Filter-Based Single-Loop Damping for LCL-Filtered Grid-Tied Inverters

Pei Cai, Xiaohua Wu, Yongheng Yang, Wenli Yao, Frede Blaabjerg

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

4 Citations (Scopus)

Abstract

Damping the LCL-filter resonance is an essential issue for grid-connected inverters. In most of the prior-art solutions, active damping focuses on a dual-loop architecture, e.g., using the capacitor-current to damp the resonance, thus complicating the entire control loop and/or increasing the cost. Digital filters (such as notch and all-pass filters) directly cascaded into the current controller, referred to as a single-loop scheme, are thus more economical, which feature no extra sensors and a simple open-loop scheme with easy parameter tuning. This paper proposes a practical single-loop damping method for grid-current feedback control (GCF) based on a first-order digital low-pass filter, which realizes damping by lagging the phase and meanwhile reducing the magnitude response for a sufficient gain margin. Simulations verify the proposed method.
Original languageEnglish
Title of host publicationProceedings of IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society
Number of pages6
PublisherIEEE Press
Publication dateOct 2018
Pages6122-6127
ISBN (Print)978-1-5090-6685-8
ISBN (Electronic) 978-1-5090-6684-1
DOIs
Publication statusPublished - Oct 2018
Event44th Annual Conference of the IEEE Industrial Electronics Society - Omni Shoreham Hotel, Washington, United States
Duration: 21 Oct 201823 Oct 2018
http://www.iecon2018.org/

Conference

Conference44th Annual Conference of the IEEE Industrial Electronics Society
LocationOmni Shoreham Hotel
Country/TerritoryUnited States
CityWashington
Period21/10/201823/10/2018
Internet address

Keywords

  • digital low-pass filter
  • single-loop damping
  • GCF
  • grid-connected inverters
  • filter-based damping

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