Three-level six-phase permanent magnet synchronous motor dual-mode operation control system and control method

Abstract

The invention provides a three-level six-phase permanent magnet synchronous motor dual-mode operation control system and control method. The power level of a three-level inverter is limited at present, the harmonics are relatively high and the torque ripple of the motor is high. The system is composed of a control circuit. The PWM signal outputted by the control circuit is electrically connected with a drive circuit (5). The drive circuit is electrically connected with a six-phase inverter (2). The six-phase inverter is electrically connected with the three-phase uncontrolled rectifier circuit(1) of a frequency converter. A phase missing detection circuit (4) is connected in parallel on the front end of the three-phase uncontrolled rectifier circuit of the frequency converter. The rear end of the three-phase uncontrolled rectifier circuit of the frequency converter is electrically connected with a bus voltage detection circuit (3). A phase missing detection circuit and the bus voltagedetection circuit are electrically connected with the A/D interface of a controller. The six-phase inverter is inputted to the A/D interface of the control circuit through a six-phase current sampling circuit 12. The control system and the control method are used for dual-mode operation control of the three-level six-phase permanent magnet synchronous motor.

Description

Technical field: [0001] The invention relates to the field of motor control, in particular to a dual-mode operation control system and control method for a three-level six-phase permanent magnet synchronous motor. Background technique: [0002] At present, two-level inverters and three-level inverters are in a dominant position in AC drive inverters, and the control technology of two-level inverters is more mature, but compared with three-level inverters , the power level is limited. Due to the small number of levels in the two levels, the harmonics of the inverter are relatively high, and the high harmonic content will make the torque ripple of the motor larger; therefore, the power of the inverter should not be too large. In order to reduce the harmonic content of the inverter output and meet the power level requirements and system reliability requirements, a three-level inverter structure is proposed. The three-level drive system can effectively reduce the harmonic conte...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of the current three-level inverter with limited power level, relatively high harmonics, and large motor torque ripple, and provide a drive topology circuit that does not need to be rebuilt, and only needs to switch between different inverters. The control method can realize the dual-mode operation control system and control method of the three-level six-phase permanent magnet synchronous motor that can operate without stopping after a phase loss fault occurs in a double Y-shifted 30° six-phase permanent magnet synchronous motor

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