ELECTRIC VEHICLE AND DEVICE FOR CONTROLLING POWER CONVERTER

摘要

This device, which is for controlling a power converter (10) such as an inverter that operates a plurality of induction motors (41) that are connected in parallel to each other and are mechanically coupled, is provided with: a current detection means (30) that detects the output current of the power converter (10); a current control means (90) that generates a voltage command value that causes the current detection value to match a current command value; a voltage command amplitude computation means (100) that computes the amplitude of the voltage command value; a storage means (110) that, for every sampling period, stores the combination of the primary frequency of the induction motors (41) and the amplitude of the voltage command value at the time; and a slope detection means (120) that computes the value resulting from dividing the amount of increase in the amplitude of the voltage command value by the amount of increase in the primary frequency on the basis of the stored information in the storage means (110), and when the division result falls below a predetermined baseline value, determines that there is at least one induction motor (41) among the plurality of induction motors (41) that has an erroneously wired phase sequence with respect to the power converter (10), and outputs a breakdown signal.