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- Title
Frequency-domain modelling and stability analysis of a DFIG-based wind energy conversion system under non-compensated AC grids: impedance modelling effects and consequences on stability.
- Authors
Chen Zhang; Xu Cai; Molinas, Marta; Rygg, Atle
- Abstract
Impedance-based frequency-domain method is an effective tool for the stability assessment of a doubly fed induction generator (DFIG) system. Several impedance models have been proposed recently; however, these models are usually associated with model reductions since the complexity in achieving a detailed DFIG model. This may lead to unreliable stability results under certain conditions, and a clarification of this modelling effect is lacking in the literature. Therefore, this study aims to address this issue by developing a detailed DFIG impedance model. To achieve this target, a modular modelling technique is proposed instead of the conventional linearisation by parts, for which the components of a DFIG system are modelled as multiport modules. Through this method, the detailed DFIG model together with four types of reduced-order models can be derived efficiently. The detailed DFIG model is verified by the measured frequency responses in PSCAD™/EMTDC™, along with its correctness in Nyquist-based stability analysis. Subsequently, four types of the reduced-order models are compared with the detailed one in terms of Nyquist plots, so that their performance and effectiveness for stability analysis are clarified. Besides, conclusions regarding the reduced-order models are also verified by time-domain simulations.
- Subjects
WIND energy conversion systems; REDUCED-order models; INDUCTION generators; GRIDS (Cartography)
- Publication
IET Power Electronics (Wiley-Blackwell), 2019, Vol 12, Issue 4, p907
- ISSN
1755-4535
- Publication type
Article
- DOI
10.1049/iet-pel.2018.5527