Direct torque control method for six-phase synchronous motor with zero-sequence current self-correction

A technology of direct torque control and zero-sequence current, applied in the field of multi-phase permanent magnet motor drive control, can solve the increase of low-order harmonic components of phase current, decrease of steady-state performance of direct torque control drive system, and decrease of load capacity And other issues

Active Publication Date: 2015-02-04
SOUTHEAST UNIV
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Problems solved by technology

Therefore, when the voltage vector is used to achieve high-performance control of electromagnetic torque and stator flux linkage, if the remaining three degrees of freedom lack correct and effective control, it will lead to a decline in the steady-state performance of the direct torque control drive system, such as low-order phase current Harmonic component increases, loss increases, load capacity decreases, etc.

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  • Direct torque control method for six-phase synchronous motor with zero-sequence current self-correction
  • Direct torque control method for six-phase synchronous motor with zero-sequence current self-correction
  • Direct torque control method for six-phase synchronous motor with zero-sequence current self-correction

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Embodiment Construction

[0062] The present invention will be further described in conjunction with embodiment and accompanying drawing now.

[0063] In the embodiment of the present invention, the drive system hardware structure is as follows Figure 8 As shown, including: rectifier circuit, filter capacitor, six-phase inverter, permanent magnet synchronous motor with six-phase symmetrical winding biased at 60 degrees, six-phase winding current acquisition circuit, rotor position angle acquisition circuit, isolation drive, central controller, man-machine interface. A suitable DC power supply can also be used to provide the DC bus voltage of the three-phase inverter. The power tube in the inverter adopts IGBT or MOFET, and the central controller adopts DSP or single-chip microcomputer. The winding current acquisition circuit is formed by combining a Hall current sensor and an operational amplifier, or by combining a winding string power resistor followed by a differential operational amplifier. The...

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Abstract

The invention discloses a direct torque control method for a six-phase synchronous motor with zero-sequence current self-correction. The direct torque control method for the six-phase synchronous motor with the zero-sequence current self-correction comprises firstly, performing voltage vector reconstruction based on an idea that a zero-sequence current is equal to zero and accordingly proposing an idea DTC (Direct Torque Control); secondly, performing discrete compensation on the actual voltage vector acting time based on the dead-time compensation principle; finally, continuously compensating the voltage vector acting time through a PI adjuster and achieving a purpose that the zero-sequence current is equal to zero. The direct torque control method for the six-phase synchronous motor with the zero-sequence current self-correction solves the problem of eliminating low-order harmonic currents in a six-phase symmetrical winding permanent magnet motor DTC system of a torque and magnetic flux linkage double-hysteresis-loop structure.

Description

technical field [0001] The invention belongs to the field of multi-phase permanent magnet motor drive control and relates to a direct torque control method of a six-phase permanent magnet synchronous motor. Background technique [0002] As warship and submarine propulsion systems, aerospace propulsion systems, electric / hybrid fuel vehicle drives, electric locomotive traction and other key areas have higher and higher reliability requirements for motor drive systems, traditional three-phase motor drives are becoming more and more difficult to meet the requirements. High-reliability multi-phase motor drive systems are increasingly favored and used in these fields. Common multi-phase motors are divided into induction motors and permanent magnet synchronous motors. Among them, multi-phase permanent magnet synchronous motors have the advantages of high efficiency and fast response speed, and are increasingly becoming a strong competitor of multi-phase induction motors. [0003] ...

Claims

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Application Information

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IPC IPC(8): H02P21/13
Inventor 周扬忠程明
Owner SOUTHEAST UNIV
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