Abstract
Considering the various low voltage ride-through (LVRT) strategies of the doubly fed induction generator (DFIG), the fault currents supplied by each collector line equipped with DFIGs are complicated and changeable. As a result, there is a maloperation risk for the conventional overcurrent protection that is generally employed for the collector line. To address this issue, this paper proposes an improved protection scheme for the collector line based on the current amplitude ratio criterion with spectrum index. The main idea of the proposed protection scheme is using the amplitude difference features of the sequence current to differentiate the fault and healthy collector line. Besides, the proposed protection scheme also introduces the spectrum index to further revise the operation threshold of the amplitude criterion. The simulation results show that combined with the conventional overcurrent protection, the proposed protection scheme can accurately identify the fault line on the one hand and with the high reliability and sensitivity on the other hand.
Published Version
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