Impacts of rotor current control targets on DC-link Capacitor Lifetime in DFIG-based wind turbine during Grid Voltage Unbalance

Holger Jedtberg, Marius Langwasser, Rongwu Zhu, Giampaolo Buticchi, Marco Liserre

Research output: Chapter in Book/Conference proceedingConference contributionpeer-review

11 Citations (Scopus)

Abstract

In doubly-fed induction generator (DFIG)-based wind turbines, the DC-link capacitor of the back-to-back (B2B) converters is one of the components that tend to fail most often. The equivalent resistance of electrolytic capacitors is frequency dependent and presents higher values in the low-frequency range. Therefore, additional low-frequency ripple current components will stress the DC-link capacitor and reduce its lifetime. Under unbalanced grid voltage conditions, the conventional vector control strategy of the rotor side converter may be replaced by flexible multi-objective control strategies, leading to different low-frequency harmonics in DC-link capacitor current. Therefore, in this paper the differences between the different control targets with respect to overall RMS current, additional low-frequency ripple current and temperature are analyzed by means of simulations for a 2 MW DFIG wind turbine.

Original languageEnglish
Title of host publication2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages3489-3495
Number of pages7
ISBN (Electronic)9781509029983
DOIs
Publication statusPublished - 3 Nov 2017
Externally publishedYes
Event9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017 - Cincinnati, United States
Duration: 1 Oct 20175 Oct 2017

Publication series

Name2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017
Volume2017-January

Conference

Conference9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017
Country/TerritoryUnited States
CityCincinnati
Period1/10/175/10/17

Keywords

  • DC-link capacitor.
  • Doubly-fed induction generator
  • Grid faults
  • Lifetime estimation

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Renewable Energy, Sustainability and the Environment
  • Control and Optimization

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