INVERTER CONTROL APPARATUS AND CONTROL METHOD THEREOF

摘要

An inverter control apparatus and a control method thereof are provided. The inverter control apparatus and a control method thereof stably operate a three-phase motor using a capacitor having a small capacitance for a DC link. The inverter control apparatus includes a current sensor to sense an output current of the inverter, a voltage sensor to sense a DC-link voltage of the inverter, and a controller to generate an average of a periodically varying rotor based q-axis current boundary value based on the output current and the DC-link voltage to generate a current reference on the basis of the average of the rotor based q-axis current boundary value, and to drive a three-phase motor based on the current reference. Stabilized variable speed control of a motor by using a small-capacitance capacitor for a DC link of an inverter is performed and reliability of an inverter circuit improved.

主权项

1. An inverter control apparatus that controls an inverter having a DC-link voltage pulsating at double a system frequency, the inverter control apparatus comprising:
a current sensor to sense an output current of the inverter; a voltage sensor to sense a DC-link voltage of the inverter; and a controller configured to:
generate a q-axis current reference in a sine squared form;generate a q-axis current boundary value on a basis of the output current and the DC-link voltage, the q-axis current boundary value representing limit of the q-axis current reference due to variation of the DC-link voltage;generate an average of the q-axis current boundary value by averaging the q-axis current boundary value for a half cycle of the system frequency;generate a d-axis current reference based on the q-axis current reference and the average of the q-axis current boundary value; anddrive a three-phase motor based on the d-axis current reference and the q-axis current reference.