A Stationary-Frame Residual-Current-Based ITSC Localization Method for Induction Motors Considering Effect of Different Faulty Phase

Le résumé fourni par la source

Diagnosis of interturn short circuit (ITSC) fault at an incipient stage is of importance for induction motor drives to achieve a reliable operation. Even though a lot of efforts had been made to detect ITSC, the fault localization has not been adequately considered in the existing works. In order to realize a fast ITSC detection and an accurate localization of the faulty phase, which is of benefit for post-fault management, this article proposes a low-complexity residual current based diagnosis method. In the proposed method, current residuals between the predicted and measured currents are obtained by a healthy current prediction model without complex observer. Rather than the conventional methods, which use current residuals in the rotary reference frame, the proposed method explores residuals in the stationary reference frame to construct fault indicators. An important benefit of this method is that it allows a direct transformation of the obtained residuals to the three-phase reference frame. As a result, a fault location indicator can be established simply by the relationship between the three-phase current residuals. A reliable fault localization is then achieved. The effectiveness of the proposed method on ITSC detection and localization has been demonstrated by experimental tests. Moreover, the robustness of the proposed method against variable operating conditions and parameter mismatches is also confirmed.

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