Apparatus and method for controlling medium voltage inverter

摘要

Provided is an apparatus and method for controlling medium voltage inverter, whereby a frequency outputted by the medium voltage inverter is fixed, in a case an instantaneous power interrupt occurs while the medium voltage inverter drives a motor, and a voltage level of an AC power generated by the medium voltage inverter is reduced and outputted in response to a predetermined deceleration slope to control the medium voltage inverter.

主权项

1. An apparatus for controlling an inverter, the apparatus comprising:
a detector configured to detect whether power to the inverter fails or the power to the inverter is recovered; and a controller configured to: maintain an output frequency of the inverter at a frequency at a time of the power failure; decrease an output voltage of the inverter according to time while maintaining the output frequency, the voltage decrease being constant; control the inverter according to an operation status of the inverter at the time of the power failure when the detector detects the power recovery prior to lapse of a predetermined period, the operation status a fixed speed operation, an acceleration operation or a deceleration operation; increase the output voltage according to time while maintaining the output frequency when the operation status prior to the power failure is the acceleration operation; and increase the output voltage to a target voltage and increase the output frequency to a target frequency, the target voltage being a voltage of the inverter at the time of the power failure.