Fault-tolerant control method for single-phase open-circuit fault of five-phase permanent magnet synchronous motor with improved SVPWM

A permanent magnet synchronous motor, open-circuit fault technology, applied in the direction of motor control, motor generator control, electronic commutation motor control, etc., can solve the problem that the utilization rate of DC bus voltage and harmonic current suppression have not attracted enough attention and degree of freedom Small problems, to achieve high dynamic performance fault-tolerant operation, improve voltage utilization, reduce the effect of current harmonic content

Active Publication Date: 2018-11-30
JIANGSU UNIV
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Problems solved by technology

However, since the strategy is derived from the perspective of current hysteresis, this method has less freedom in SVPWM fault tolerance
In addition, under fault-tolerant conditions, issues such as DC bus voltage utilization and harmonic current suppression have not attracted enough attention

Method used

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  • Fault-tolerant control method for single-phase open-circuit fault of five-phase permanent magnet synchronous motor with improved SVPWM
  • Fault-tolerant control method for single-phase open-circuit fault of five-phase permanent magnet synchronous motor with improved SVPWM
  • Fault-tolerant control method for single-phase open-circuit fault of five-phase permanent magnet synchronous motor with improved SVPWM

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Embodiment Construction

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0044] Step 1, deduce and simplify the phase voltage decoupling transformation matrix under the general fault-tolerant SVPWM control mode.

[0045] Assuming that the single-phase open-circuit fault occurs in the A-phase winding of the five-phase permanent magnet motor, the phase voltage decoupling transformation matrix under normal conditions can be expressed as equation (1):

[0046]

[0047] where T Clarke is the phase voltage decoupling transformation matrix under the open-circuit fault of phase A; α x is the angle between two adjacent phases.

[0048] The general fault-tolerant SVPWM control method is to simplify the decoupling calculation of the phase voltage, adjust the transformation matrix, and obtain the phase voltage decoupling transformation matrix as shown in ...

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Abstract

The invention discloses a fault-tolerant control method for a single-phase open-circuit fault of a five-phase permanent magnet synchronous motor with improved SVPWM. The method comprises the followingsteps: obtaining a variety of SVPWM fault-tolerant control methods corresponding to different solutions of control parameters by the algorithm according to the existing five-phase SVPWM fault-tolerant control theory, solving the optimal solution of the control parameters to reconstruct the post-fault system coordinates by analyzing the direct current bus voltage utilization and phase current harmonic suppression ability of the motor, and performing redistribution and district reconstruction of spatial vectors on the reconstructed coordinate system. Compared with the prior art, the fault-tolerant control method effectively reduces the current harmonic content, restrains the motor torque ripple, and simultaneously improves the direct current bus voltage utilization rate while ensuring thatthe average torque outputs of the motor before and after the single-phase open circuit fault are constant. More critically, the fault-tolerant algorithm may achieve high dynamic performance fault-tolerant operation of the motor and has certain versatility.

Description

technical field [0001] The invention relates to the technical field of fault-tolerant control of multi-phase motors, in particular to a fault-tolerant control method for five-phase permanent magnet motors based on . It is suitable for occasions that have high requirements on the reliability of motors, such as aerospace, electric vehicles, and ship propulsion systems. Background technique [0002] Compared with traditional three-phase motors, multi-phase motors have a higher degree of control freedom and thus better fault tolerance. It has received more and more attention and applications in fields requiring high reliability operation such as electric vehicles, ship propulsion, and aerospace. In recent years, universities and scientific research institutions at home and abroad have also carried out in-depth research on the fault-tolerant control strategy of five-phase permanent magnet motors. [0003] Generally speaking, the current hysteresis band pulse width modulation me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/20H02P6/10H02P29/024H02P29/028
CPCH02P6/10H02P21/20H02P29/0243H02P29/032
Inventor 刘国海宋成炎徐亮赵文祥杨欣宇
Owner JIANGSU UNIV
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