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Resistance Imbalance Fault Diagnosis in Rotor Wingdings of DIFG Considering Current Closed-Loop Effect

2024; Springer Science+Business Media; Linguagem: Inglês

10.1007/978-981-97-1068-3_22

1876-1119

Zhicheng Zhou, Xubing Xiao, Xijin Wu, Tao Zheng, Yongjiang Jiang,

Elevator Systems and Control

Rotor winding resistance imbalance (RWRI) faults will cause the generation of the second-order components in d-axis and q-axis currents and voltages of the rotor winding, which are not present in a healthy doubly-fed induction generator (DFIG). Then the second-order component can be used for RWRI diagnosis. However, the second-order component caused by RWRI faults is affected by current closed-loop control. In order to accurately diagnose RWRI, accurately assess the severity of RWRI faults, and eliminate the impact of current closed-loop control, a new method for RWRI fault diagnosis based on the second-order component of d-axis voltage is proposed in this paper. Firstly, the d-axis and q-axis voltage equations of the DFIG under RWRI fault are presented, and the block diagram of the current closed-loop control for the second-order component is obtained in combination with the control strategy. Then, a mathematical model is derived, which is for the second-order components in the d-axis and q-axis currents and voltages of the DFIG rotor winding with the current closed loop. Based on this model, a RWRI diagnosis method was proposed. In the proposed method, both the location and the severity of the RWRI can be accurately obtained. Finally, the effectiveness of this method was verified through simulation.