NAME: ROSHIMA T V
TITLE OF THE PROJECT: FAULT TOLERANT CONTROL SCHEME FOR PWM INVERTER FED INDUCTION MOTOR BASED RAILWAY POWER SYSTEM.
Long distance trains are usually powered by a single-phase AC line of 25 kV at 50 Hz. Traditionally a traction drive mainly consists of a single-phase AC/DC converter, a DC-link bus and a three-phase DC/AC PWM converter. In the past, the DC-link bus was obtained through diode rectifiers, which generate line currents with high harmonic distortion and low power factor. In order to reduce these problems, we can use four-quadrant interlaced Converters. It is estimated that about 38% of the faults in variable-speed ac drives in industry are due to failures of power devices. A closed-loop control system which can tolerate component malfunctions, while maintaining desirable performance and stability properties is said to be a fault-tolerant control system. The goal of this project is to study railway power system with and without interlacing of converters for harmonic rejection and to implement fault tolerant control strategy to the voltage source inverter of railway power system in the event t of IGBT open circuit fault.
