A Sensor Fault Diagnosis Method for Rectifier Used in Traction Systems

Reliable fault diagnosis methods are necessary to ensure the safety of traction systems. Sensor faults are common in rectifiers, they can cause the feedback signal deviation and lead to security risks. This paper proposes a fault diagnosis method for grid-side current and DC-link voltage sensor faults in rectifiers, which can not only locate the faults but also identify fault types. First, the topology is introduced, the model is built. Then, the grid current residual is calculated and analysed with different sensor faults. Next, the residual is applied to fault detection. Diagnosis functions based on characteristics of the current and the residual are constructed, faults can be located and fault types can be identified. Finally, a simulation testing platform based on MATLAB is built, the correctness and effectiveness of this method can be verified by simulation results.