Abstract
In an unbalanced distribution network, transforming three-phase unbalanced components into components with positive, negative, and zero sequences is difficult. Moreover, the fault currents of doubly fed induction generators (DFIGs) exhibit a complex nonlinear relationship. The fault characteristics of DFIGs with an activated crowbar differ from those with a non-activated crowbar. Moreover, distinguishing between these two crowbar conditions based on calculations is difficult. Therefore, the traditional symmetric component method is unsuitable for unbalanced distribution networks with DFIGs owing to its low calculation accuracy. In this work, the equivalent calculation phase component models of DFIGs are analyzed using low-voltage control strategies. In particular, the activation criterion of crowbar protection in the time domain is proposed. A novel fault analysis method for unbalanced distribution networks with DFIGs is also proposed. The action condition of crowbar protection is assessed using the traversal method, and the coupling relationship among DFIGs is determined using an iterative calculation method. Finally, the effectiveness of the proposed fault analysis method is verified by simulation.
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