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

A technology of permanent magnet synchronous motor and harmonic current, applied in motor control, motor generator control, AC motor control, etc.

Active Publication Date: 2019-06-14
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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  • Claims
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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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  • Harmonic current control method of asymmetric six-phase permanent magnet synchronous motor
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  • Harmonic current control method of asymmetric six-phase permanent magnet synchronous motor

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[0056] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0057] Aiming at the control problem of asymmetric six-phase permanent magnet synchronous motor based on model prediction, the typical FCS-MPC controller method is currently used to suppress the non-ideal harmonic current. The principle of this method is to add harmonic current control to the FCS-MPC controller by designing a cost function. The schematic diagram of this strategy is as follows ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/50H02P21/22H02P21/00H02P25/022H02P25/22
Inventor 李健王浩琢肖天正李勇
Owner HUAZHONG UNIV OF SCI & TECH
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