Harmonic current control method for asymmetrical six-phase permanent magnet synchronous motor
A permanent magnet synchronous motor, harmonic current technology, applied in the direction of motor control, motor generator control, AC motor control, etc., to achieve the effect of minimum harmonic current control and simple structure
Active Publication Date: 2021-02-09
HUAZHONG UNIV OF SCI & TECH
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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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[0055] 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.
[0056] 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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The invention discloses a harmonic current control method of an asymmetrical six-phase permanent magnet synchronous motor, which includes S1: decoupling the voltage vector in the six-phase permanent magnet synchronous motor to obtain the current variable i in the dqz coordinate system respectively dq i dqz ; S2: For the current variable i dq Perform FCS-MPC control to obtain command voltage signal S3: for the current variable i dqz Perform PR regulator control to obtain the command voltage signal S4: respectively perform dq inverse transformation and dqz inverse transformation on the command voltage signal to obtain the command voltage signal sum in the xy coordinate system S5: perform space vector coupling on the command voltage signal sum, Get the coupling command voltage signal and then generate the control signal D phs Perform SPWM modulation and give it to the inverter to control the motor. The control method of the present invention realizes the minimum harmonic current control, and has a simple structure. Compared with the classic FCS-MPC, it only needs to add a proportional resonant regulator in the xy subspace without affecting the αβ current, that is, the added PR regulator Does not affect 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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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