Inverter control device and inverter control method

摘要

An inverter control device is equipped with an inverter and a command value calculation unit calculates command values for the alternating current voltage output from the inverter. A phase compensation unit compensates the phase of the command values or the phase of the detected values. An inverter control unit controls the inverter on the basis of the command values or detected values that have been compensated by the phase compensation unit. A motor rotational velocity detector detects the rotational velocity of a motor. The phase compensation unit calculates the phase lead amount on the basis of a phase compensation time that is set for the purpose of obtaining a prescribed phase margin and on the basis of the rotational velocity and, in accordance with the phase lead amount, compensates the phase that is based on the specific characteristics of the motor.

主权项

1. An inverter control device comprising:
an inverter configured to convert direct-current power inputted from a direct-current power supply into alternating-current power, and to supply the alternating-current power to a motor; a command value calculation unit configured to calculate a command value of an alternating-current voltage outputted from the inverter, on the basis of a detection value of an alternating current; a phase compensation unit configured to compensate for any of a phase of the command value and a phase of the detection value; an inverter control unit configured to control the inverter on the basis of any of the command value and the detection value compensated for by the phase compensation unit; a motor rotational velocity detection unit configured to detect a rotational velocity of the motor; a current detection unit configured to detect the detection value by detecting phase currents of the motor; and a first coordinate transformation unit configured to transform the phase currents into d- and q-axis currents, wherein the phase compensation unit calculates a phase lead amount by multiplying the rotational velocity by a phase compensation time determined on a basis of an inherent characteristic of the motor, and compensates for a phase based on an inherent characteristic of the motor in accordance with the phase lead amount, the command value calculation unit includes
a current command value calculation unit configured to calculate d- and q-axis current command values on the basis of a torque command value and the rotational velocity of the motor, anda voltage command value calculation unit configured to calculate d- and q-axis voltage command values to conform the d- and q-axis currents to the d- and q-axis current command values, andthe phase compensation unit compensates for phases of the d- and q-axis voltage command values.