Fault Tolerant Soft Starter Control for Induction Motors

This thesis presents a fault-tolerant soft starter capable of operating in a two-phase mode in the event of a thyristor/SCR open-circuit or short-circuits switch-fault in any one of the phases using closed-loop control scheme. This soft starter fault-tolerant control will reduce starting motor torque pulsations and reduced inrush current magnitudes. Faults occurring in soft starters do not cause immediate permanent damage to the motor-soft starter system. But the impact of a fault on both the soft starter and the motor will gradually evolve into a severe damage stage if the fault is left unattended. A DSP controller is used to give the triggering pulses to the thyristors connected in antiparallel. This thesis includes the simulation of fault tolerant closed loop control of induction motor with SCR switch fault.

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