Abstract
Harmonic transient analysis of wind turbine generators (WTGs) requires reliable models to reproduce harmonic dynamics accurately and to ensure that such models perform closely to actual components.A recent harmonic modeling technique, named flexible extended harmonic domain (FEHD), is adopted in this paper as part of the proposed approach. FEHD provides reduced-order extended harmonic domain (EHD) models that include an arbitrary number of harmonics (not necessarily sequentially-numbered) in each state/part of the system; thus, leading to computational burden improvement while keeping accuracy and high-frequency ripple information.The adopted FEHD together with time-domain (TD) are interfaced in this paper to produce a hybrid TD/FEHD, which is used to model a synchronous-based WTG. In the proposed WTG model, the whole system is divided into TD-based and FEHD-based subsystems. These two subsystems can use distinct integration time-steps; thus, leading to improvement in CPU-time compared to pure EHD models, without losing accuracy. The criterion to select both subsystems consists on simulation requirements, i.e., using TD for the zone where averaged dynamics are sufficient whilst FEHD is used where high-order harmonic dynamics are important for harmonic transient analysis.The obtained results are verified with experimental data and validated with PSCAD/EMTDC, revealing a very good agreement.
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