Dead-time compensation method and device of inverter and inverter

Abstract

The invention proposes a dead-time compensation method and device of an inverter and the inverter, and relates to the field of motor control. The dead-time compensation method of the inverter comprises the steps of acquiring a sampling current according to an output current of a three-phase inverter; determining a rotor position angle of the sampling current; determining a current vector phase angle of the sampling current; determining phase delay compensation quantity for compensating filtering delay; determining a phase of the sampling current according to the rotor position angle, the current vector phase angle and the phase delay compensation quantity; determining a phase dead-time compensation value by a predetermined compensation strategy according to the phase of the sampling current; and compensating a driving current of the three-phase inverter according to the phase dead-time compensation value. The acquired phase of the sampling current, acquired by the method, is more accurate, the determined phase dead-time compensation value is also more accurate, so that more accurate phase dead-time compensation value is obtained, and the dead-time compensation effect is further optimized.

Description

technical field [0001] The invention relates to the field of motor control, in particular to an inverter dead zone compensation method, device and inverter. Background technique [0002] In the inverter, due to the characteristics of the switch tube itself, it takes a certain time for each switch tube to be turned on and off, and the turn-off time is longer than the turn-on time. In the inverter, if there are two switch tubes on the same bridge arm, and the other switch tube is turned on during the turn-off process of one switch tube, it will inevitably cause a short circuit of the bridge arm. In order to prevent the short circuit of the bridge arm, the trigger signal is usually delayed for a period of time, which is called "dead time", and its impact is called "dead time effect". The dead zone effect will distort the output phase voltage and current waveform, and the torque will pulsate, especially at low speed, it is easy to cause the motor to oscillate or even lose step....

AI Technical Summary

Problems solved by technology

The dead zone effect will distort the output phase voltage and current waveform, and the torque will pulsate, especially at low speed, it will easily cause the motor to oscillate or even lose step

[0003] In recent years, various compensation algorithms for dead zone effects have been prop

Images