Pole placement-based sensor fault detection and isolation of a single phase PWM rectifier for electric railway traction

Modern railway traction power systems are fed by 2×25 kv/50 Hz single phase ac current sources or by 1500 vdc voltage from electric railway substations. This paper presents an easy and a robust sensor fault detection and isolation (FDI) of a single phase PWM rectifier for electric railway traction application. PR controller is used to regulate ac currents in single phase system, in order to obtain both zero magnitude and phase errors. Catenary current sensor and dc link voltage sensor failures of the single phase PWM rectifier are considered. In this paper, Fault detection and isolation methods are mainly depends upon the pole placement based observed values and threshold values. This method allows a good detection and isolation of the sensor fault. Simulation/MATLAB results are presented to show the effective performance of the fault detection and isolation of a single phase PWM rectifier.