Frequency and Sequence Couplings in Type 4 and Type 3 Wind Turbines

Behnam Nouri*, Lukasz Kocewiak, Poul Sørensen

*Corresponding author for this work

Research output: Contribution to conferencePaperResearch


The multi-frequency (harmonic) interaction among converters is an increasing challenge in converter-dominated power grids. To study steady-state harmonics and transient harmonic stability, it is crucial to develop accurate multifrequency models for converters. However, the frequency and sequence couplings have not been addressed in the state-of-the-art analytical models as well as model validation tests for converters. This paper overviews the impedance measurement test methods for converters and demonstrates the couplings in frequencydomain based on time-domain simulations using typical Type 4 and Type 3 wind turbine models. The analysis shows significant frequency and sequence couplings which are neglected in the simplified analytical models.
Original languageEnglish
Publication date2020
Number of pages6
Publication statusPublished - 2020
Event19th Wind Integration Workshop 2020 - Virtual event
Duration: 11 Nov 202012 Nov 2020


Conference19th Wind Integration Workshop 2020
CityVirtual event


  • Frequency coupling
  • Sequence coupling
  • Pertubation test
  • Wind turbine
  • Multi-frequency model

Fingerprint Dive into the research topics of 'Frequency and Sequence Couplings in Type 4 and Type 3 Wind Turbines'. Together they form a unique fingerprint.

Cite this