Current-waveform-similarity-based Pilot Protection of Wind Farm Transmission Lines
The difference in electromagnetic transient characteristics between doubly fed induction generator(DFIG)and traditional power sources makes the existing protection inadequate in adapting to distribution lines of high permeability DFIG wind power integration system.In order to improve speed and reliability of fault identification,a new pilot protection scheme based on waveform mismatching degree of current is proposed in this paper.The Frechet algorithm is used to compare the difference in current discrete data between the two sides of the protected line.A large number of simulations show that the proposed algorithm can reliably and promptly identify faults with different types,positions and other conditions.
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