Rectifier Faults In Variable Voltage Variable Frequency Induction Motor Drives

This paper investigates the uncontrolled rectifier faults in variable voltage variable frequency induction motor drive. These faults are categorized to either open circuit or short circuit for one diode or more. The fault results are compared with the results of a healthy drive system depending on measuring the dc-link voltage and recording the root mean square value of the input voltage to the motor terminals. An algorithm which represents the fault cases gives a way for fault detection technique is introduced. The system under both healthy case and faulty cases is simulated and validated experimentally.