4.1 Article

A Parameter-Free Method for Estimating the Stator Resistance of a Wound Rotor Synchronous Machine

Journal

WORLD ELECTRIC VEHICLE JOURNAL
Volume 14, Issue 3, Pages -

Publisher

MDPI
DOI: 10.3390/wevj14030065

Keywords

resistance estimation; wound rotor synchronous machine (WRSM); motor parameters; parameter identification

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This paper presents a new online method based on low frequency signal injection to estimate the stator resistance of a Wound Rotor Synchronous Machine (WRSM). The proposed estimator provides a parameter-free method for estimating the stator resistance. In this method, a low frequency sinusoidal current is injected in the d axis of the stator current to produce a sinusoidal flux in the stator, and the phase difference between the generated sinusoidal flux and the injected sinusoidal current is used to estimate the stator resistance. Validation was done through simulations and experimental tests.
This paper presents a new online method based on low frequency signal injection to estimate the stator resistance of a Wound Rotor Synchronous Machine (WRSM). The proposed estimator provides a parameter-free method for estimating the stator resistance, in which there is no need to know the values of the parameters of the machine model, such as the stator and rotor inductances or the rotor flux linkage. In this method, a low frequency sinusoidal current is injected in the d axis of the stator current to produce a sinusoidal flux in the stator. In this paper, it is shown that the phase difference between the generated sinusoidal flux and the injected sinusoidal current is related to the stator resistance mismatch. Using this phase difference, the stator resistance is estimated. To validate the proposed model-free estimator, simulations were performed with Matlab Simulink and the results were compared with the extended Kalman filter observer. Finally, experimental tests, under different conditions, were performed to estimate the stator resistance of a WRSM.

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