METHOD FOR COMPENSATING VOLTAGE ERROR WITH DEAD-BAND OF PWM VOLTAGE TYPE INVERTER AND THE SAME INVERTER

摘要

PROBLEM TO BE SOLVED: To provide a PWM voltage type inverter which can compensate for a voltage error with a dead-band time even in the PWM output system (PWM output system in which the voltage command of each phase U, V and W does not exist from viewpoint of the arithmetic calculation) for calculating in direct the switching patterns of U, V, W phases with a voltage command of two axes of d-q. SOLUTION: The voltage error calculation circuits 12U, 12V, 12W calculate voltage errors vu, vv, vw with the dead-band of each phase U, V, W. A dead-band compensation amount calculation circuit 13 calculates the dead-band compensation amounts , of the -axis and -axis from the voltage errors vu, vv, vw. The dead-band compensation amounts , are then inputted to a dead-band compensation amount converting circuit 14 and are converted to the dead-band compensation amounts d, qof the d-axis and q-axis. The adders 15, 16 respectively add the dead-band compensation amounts q, d of the q-axis and d-axis to the voltage commands Vqref, Vdref of the q-axis and d-axis in order to compensate for the voltage commands Vqref, Vdref.