Reduced-order models of squirrel-cage induction generators for fixed-speed wind turbines under unbalanced grid conditions
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This paper develops a study of reduced-order models for squirrel-cage induction generators used in the fixed-speed wind turbines. The squirrel-cage of these generators must be modeled with a double-cage for accuracy purposes. These proposed reduced-order models are valid for unbalanced grid conditions (unsymmetrical faults), which require flux and current decomposition into positive-and negative-sequences. Three reduced-order models are obtained: R2 model, where the derivative of the positive and negative-sequences of the stator fluxes are neglected (the usual approach in the literature); R1 model, where the derivative of the negative-sequence of the rotor fluxes are also neglected (proposed model); and R0 model, where all the stator and rotor fluxes are neglected (steady-state electrical model). The analytical models are validated with simulations carried out in the MATLAB and with experimental tests. The results show that R1 model (proposed model) shows a good performance (similar to the full-order model) under unbalanced conditions.
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CitationRolan, A. [et al.]. Reduced-order models of squirrel-cage induction generators for fixed-speed wind turbines under unbalanced grid conditions. "IEEE transactions on energy conversion", Juny 2016, vol. 31, núm. 2, p. 566-577.