An improved starting strategy for voltage-source inverter fed threephase induction motor drives under inverter fault conditions

摘要

Three phase voltage-fed inverter induction motor drives are pronento shoot through and other inverter faults that cause the drive systemnto shut down. The paper describes a novel strategy for restarting thendrive in variable voltage variable frequency single phase mode in thenpresence of open base drive and shoot through fault in the inverter. Thenproposed method requires only the motor terminal voltages and currentsnto be measured. Therefore, it can be applied to even low performancenopen loop drives with the addition of two motor terminal voltagensensors. The starting algorithm has been verified by computer simulationnand experiments on a 1 hp laboratory prototype. Experimental results arenin good agreement with simulation predictions. The starting strategyndescribed in this paper is expected to provide an economic alternativento more expensive redundancy techniques which find justification only inna few specialized applications