Voltage source inverter fault diagnosis in variable speed AC drives, by Park's vector approach

This paper presents the use of the Park's vector approach for diagnosing voltage source inverter faults, like output single-phasing and the occurrence of either a short-circuit or an open circuit of the controlled power switches. For this study, a prototype was built, having all the power terminals available for testing, including the ones for every semiconductor. For the short-circuit tests, a 17 /spl Omega/ auxiliary resistor was used, connected in parallel with the power switch to be tested, in order to limit the short-circuit current.