A non-sinusoidal SVPWM control method and device for a multi-phase permanent magnet synchronous motor

Abstract

The invention discloses a non-sinusoidal SVPWM (Space Vector Pulse Width Modulation) control method and device for a multiphase permanent-magnet synchronous motor, and belongs to the field of alternating current motors and driving control. According to the method, input compensation and output transformation are performed on harmonic injection non-sinusoidal power supply for SVPWM by taking SPWM output phase modulated wave as a reference. During input compensation, harmonic plane compensation angles phi<1>, phi<3>,..., phi<n-2> are calculated through an actual voltage d-q given component, anda motor actual feedback angle theta<r> is overlapped in order to compensate harmonic plane axis d voltage given values u<d1><*>, u<d3><*>,..., u<d(n=2)><*> of the harmonic injection non-sinusoidal power supply. During output transformation, multiphase SVPWM output phase modulated wave is transformed into a square wave non-sinusoidal waveform through an expansion Park transformation matrix T<c>(theta) of which components d and q are exchanged. Moreover, a non-sinusoidal SVPWM control device for the multiphase permanent magnet synchronous motor is provided. Through adoption of the method and device, a harmonic injection non-sinusoidal power supply technology for SVPWM under closed-loop tracking is implemented, and a reference thought is provided for combined application of harmonic injectionnon-sinusoidal power supply, multiphase SVPWM and other open loop voltage given algorithms to a closed-loop tracking system.

Description

technical field [0001] The invention belongs to the field of AC motor and drive control, and more specifically relates to a non-sinusoidal SVPWM control method and device for a multi-phase permanent magnet synchronous motor. Background technique [0002] Multi-phase systems with more than 3 phases have the advantages of low-voltage devices to achieve high power, good torque performance, and phase-loss fault-tolerant operation, making them popular in high-power and high-reliability industrial applications with limited voltage. The superior controllability of permanent magnet motors enables them to be used in more and more industrial scenarios. Multiphase permanent magnet synchronous motor has the advantages of good controllability of permanent magnet motor and high reliability of multiphase motor, so it has broad application prospects. At present, most multi-phase permanent magnet synchronous motors use fundamental sinusoidal power supply, which does not give full play to it...

AI Technical Summary

Problems solved by technology

[0007] The traditional non-sinusoidal power supply technology is based on the multi-phase asynchronous motor open-loop voltage reference vector given method, which cannot work normally under the closed-loop multi-phase permanent magnet synchronous motor

The current existing phase compensation method can easily extend an algorithm based on an open-loop voltage given method to a closed-loop tracking method, but in the non-sinusoidal SVPWM algorithm, harmonic injection into non-sinusoidal power supply and multi-phase SVPWM cannot be achieved through one-time phase compensation

Harmonic injection non-sinusoidal power supply technology can only be realized by multi-phase SPWM modulation, and multi-phase SPWM modulation method involves a large number of trigonometric function calculations, which is not convenient for computer operation

[0008] Therefore, the harmonic injection non-sinusoidal power supply technology of multi-phase permanent magnet synchronous motor using SVPWM modulation under current closed-loop tracking needs further research to solve the problem of difficult to realize the harmonic injection non-sinusoidal technology of multi-phase permanent magnet synchronous motor using SVPWM modulation under current closed-loop tracking Technical issues of practical application of power supply technology

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