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On the Impedance Modeling and Equivalence of AC/DC Side Stability Analysis of a Grid-tied Type-IV Wind Turbine System

Zhang, Chen; Molinas Cabrera, Maria Marta; Rygg, Atle; Cai, Xu
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2592282
Date
2018
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  • Institutt for teknisk kybernetikk [2866]
  • Publikasjoner fra CRIStin - NTNU [26746]
Original version
10.1109/TEC.2018.2866639
Abstract
Impedance modeling of a Type-IV wind turbine is usually associated with model reductions, e.g. the grid-side converter (GSC) is modeled in detail, whereas the machine-side converter (MSC) is simplified as a constant power load (CPL). Meanwhile, the Nyquist-based stability analyses are normally conducted on the ac side, where the evaluation of the stability margin can be difficult due to the presence of multiple eigen-loci. Although some similar analyses regarding the high-voltage dc systems are performed on the dc side, a justification of the consistency between the ac and dc side analysis is lacking. Therefore, this paper aims to address these issues by first developing a detailed impedance model of the Type-IV wind turbine, and then providing a formal proof of the equivalence between the ac and dc side analysis. The detailed Type-IV wind turbine model is verified by the measured frequency responses from simulations, as well as its correctness in Nyquist-based stability analysis. The MSC modeling effects are further discussed, for which a thorough comparison of the CPL-based model and the detailed model with respect to the stability margin is conducted. As a result, the feasibility of the CPL-based model for stability analysis is clarified.
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Journal
IEEE transactions on energy conversion

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