Extension of the Generic Multi-Frequency Modelling Method for Type 3 Wind Turbines

Behnam Nouri*, Lukasz Kocewiak, Shahil Shah, Przemyslaw Koralewicz, Vahan Gevorgian, Poul Sørensen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Reflecting potential non-linearities of converter-based systems, especially frequency and sequence couplings, is an ongoing challenge for linearized multi-frequency models. Besides, design details are required to develop such models, which either are the intellectual property of manufacturers or require experimental tests. The generic multi-frequency modelling method has been proposed to fill this gap; however, it is only developed for converter-connected systems, e.g., Type 4 Wind Turbines (WT). This paper proposes to extend the application of the generic multi-frequency modelling method for Type 3 WTs. In this way, a theory for patterns of the couplings in Type 3 WTs is proposed. Accordingly, a group of emissions and couplings are Rotor-Speed-Dependent (RSD). The RSD emissions and couplings are particular characteristics of Type 3 WTs, which should be addressed in the generic multi-frequency models. The proposed theory is verified by unique-worldwide experimental perturbation tests on a 2 MVA Type 3 WT using a 7 MVA grid emulator. Accordingly, a limited number of RSD couplings and emissions are observed in the test results, mainly in low frequencies (below 1 kHz). Therefore, addressing the RSD couplings is practical and important to extend the generic multi-frequency modelling for Type 3 WTs.
Original languageEnglish
JournalIEEE Transactions on Energy Conversion
Issue number3
Pages (from-to)1875-1884
Number of pages10
Publication statusPublished - 2022


  • Generic multi-frequency modelling
  • Frequency couplings
  • Pertubation test
  • Type 3 WTs


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