Analysis and Design of Robust LLCL-Type Filters for Grid-Tied Applications with Capacitor-Current Active Damping

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

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

Abstract

LCL filters are adopted to attenuate the switching-frequency harmonics in grid-tied applications. To meet stringent grid requirements, higher order filters have further been proposed. LLCL, is an example, which can provide an additional trap at the switching sideband frequency, and thus, it can better attenuate switching-frequency harmonics. Unlike traditional high-order filters with resonance frequency below the Nyquist frequency, this paper place it of the LLCL above the Nyquist frequency with trap frequency set at the dominant harmonics. Then, with capacitor-current damping, new stability regions are explored and employed for robust design against the grid impedance variations. Simulations verify the analysis and design.
Original languageEnglish
Title of host publicationProceedings of the 2020 IEEE 9th International Power Electronics and Motion Control Conference (IPEMC2020-ECCE Asia)
Number of pages7
PublisherIEEE
Publication dateNov 2020
Pages785-791
Article number9367919
ISBN (Electronic)978-1-7281-5301-8
DOIs
Publication statusPublished - Nov 2020
Event9th IEEE International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia - Nanjing, China
Duration: 29 Nov 20202 Dec 2020

Conference

Conference9th IEEE International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia
CountryChina
CityNanjing
Period29/11/202002/12/2020

Keywords

  • Active damping
  • frequency folding
  • LCL
  • LLCL
  • capacitor current
  • grid-tied inverters

Fingerprint Dive into the research topics of 'Analysis and Design of Robust LLCL-Type Filters for Grid-Tied Applications with Capacitor-Current Active Damping'. Together they form a unique fingerprint.

Cite this