A Root-Locus Design Methodology Derived from the Impedance Stability Criterion and Its Application for LCL Grid-Connected Converters

Enrique Rodriguez Diaz, Francisco Daniel Freijedo Fernandez, Mohammad Golsorkhi, Juan Carlos Vasquez Quintero, Josep M. Guerrero

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

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Abstract

This paper presents a systematic methodology for design and tuning of the controller of LCL grid-connected converters. The proposed approach is derived from the impedance/admittance stability formulation , which eases the controller modelling of LCL grid-connected systems. After system modelling, a modified sensitivity function is defined to analyze the closed loop dynamics. For practical development, the control objectives are linked to main requirements in wind turbine applications: 1) the current control time constant should be minimized and 2) active damping actions should effectively mitigate the LCL resonance. After the theoretical development, an insightful case study is provided. It is shown that the tuning problem can be solved approximately by root-loci inspection and an optimum solution can be found by direct search. The theoretical approach is experimentally verified by a lab-scale prototype that uses the same parameters of the case study.
Original languageEnglish
Title of host publicationProceedings of 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe), 2016
Number of pages10
PublisherIEEE Press
Publication dateSept 2016
ISBN (Electronic)978-9-0758-1524-5
DOIs
Publication statusPublished - Sept 2016
EventEPE'16 - ECCE: 18th European Conference on Power Electronics and Applications - Karlsruhe Town Hall (Stadthalle), Karlsruhe, Germany
Duration: 5 Sept 20169 Sept 2016
Conference number: 18
http://www.epe2016.com/

Conference

ConferenceEPE'16 - ECCE: 18th European Conference on Power Electronics and Applications
Number18
LocationKarlsruhe Town Hall (Stadthalle)
Country/TerritoryGermany
CityKarlsruhe
Period05/09/201609/09/2016
Internet address

Keywords

  • Ac/dc converter
  • Active damping
  • Converter control
  • Wind energy

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