Harmonic current control method of asymmetric six-phase permanent magnet synchronous motor

Abstract

The invention discloses a harmonic current control method of an asymmetric six-phase permanent magnet synchronous motor. The method comprises the steps of S1, carrying out decoupling on the voltage vectors in the six-phase permanent magnet synchronous motor to obtain current variables idq and idqz in a dqz coordinate system; S2, carrying out FCS-MPC control on the current variable idq to obtain aninstruction voltage signal V*dq; S3, enabling the current variable idqz to be subjected to PR regulator control to obtain an instruction voltage signal V*dqz; S4, carrying out dq inverse transformation and dqz inverse transformation on the V*dq and V*dqz to obtain instruction voltage signals V* alpha beta and V*xy under an xy coordinate system respectively; and S5, carrying out spatial vector coupling on the V* alpha beta and V*xy to obtain a coupled instruction voltage signal V*phs and then generating a control signal Dphs to carry out SPWM to be given to an inverter so as to control the motor. According to the control method disclosed by the invention, the minimum harmonic current control is realized, the structure is simple; compared with the classical FCS-MPC, only a proportional resonance regulator needs to be added in the xy subspace without affecting the alpha beta current, that is, the added PR regulator does not influence the original performance of the output torque.

Description

technical field [0001] The invention belongs to the field of harmonic current control technology of permanent magnet synchronous motors, and more specifically relates to a harmonic current control method of an asymmetrical six-phase permanent magnet synchronous motor. Background technique [0002] Multiphase motors have strong power splitting capability, low torque ripple, and fault-tolerant operation, and can perform well in high-power, high-current applications, such as electric vehicles, all-electric aircraft, and ship propulsion. Among various multi-phase motors, the asymmetric six-phase motor has the advantages of low 6th harmonic torque ripple, and only needs two sets of three-phase converters to be powered in parallel without any special inverter design, so it is widely used , In-depth research. However, in an asymmetrical six-phase motor, since the impedance of the xy subspace is small, consisting only of stator resistance and leakage inductance, large harmonic curr...

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Problems solved by technology

[0004] Aiming at the asymmetric six-phase permanent magnet synchronous motor controlled by FCS-MPC, which will be accompanied by relatively large harmonic current generation, the invention provides a harmonic current control method for an asymmetric six-phase permanent magnet synchronous motor, which solves the problem of existing scheme inherently deficient in achieving minimum harmonic current control

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