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Five-phase-inverter dual-motor-system fault-tolerant control method based on direct torque control

A direct torque control, five-phase inverter technology, applied in direct torque control, multiple motor speed/torque control, field acceleration method control, etc., can solve the problem of high controller requirements and meet hardware circuit requirements Low, high switching frequency, fast dynamic response effect

Active Publication Date: 2016-08-31
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pulse width modulation technology must be used, which has high requirements for the controller

Method used

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  • Five-phase-inverter dual-motor-system fault-tolerant control method based on direct torque control
  • Five-phase-inverter dual-motor-system fault-tolerant control method based on direct torque control
  • Five-phase-inverter dual-motor-system fault-tolerant control method based on direct torque control

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Embodiment Construction

[0061] Embodiments of the present invention will be described below with reference to the drawings.

[0062] The driving system structure of the embodiment of the present invention is as figure 1 As shown, it includes: a DC voltage source, an inverter circuit, a permanent magnet synchronous motor, a drive circuit, a voltage sampling circuit, a current sampling circuit, and a central processing unit. The DC voltage source provides the DC bus voltage to the inverter circuit, the voltage sampling circuit measures the DC bus voltage, and the current sampling circuit measures the three-phase current of the motor.

[0063] The parameters of the permanent magnet synchronous motor in this embodiment are: rated phase voltage U N =220V, number of pole pairs p n =4, stator phase resistance R s =0.625Ω, direct axis inductance L d =8.5mH, quadrature axis inductance L q =8.5mH, permanent magnet flux linkage ψ f =0.442Wb, rated speed n N =1500r / min. The specific experimental conditio...

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Abstract

The invention discloses a five-phase-inverter dual-motor-system fault-tolerant control method based on direct torque control. The method comprises the following steps of using the direct torque control to acquire phase switch states needed by two motors respectively; taking 4 independent phase switch states as 4 independent bridge arm switch states directly; defining a weighting function, combining the directly-acquired 4 independent bridge arm switch states so as to obtain 5 bridge arm switch states of a five-phase inverter, and then making the five-phase inverter drive two 3-phase motors, wherein a common bridge arm switch state is selected from the two phase switch states according to a size of a weighting function value. The fault-tolerant control method possesses advantages of low cost, high reliability, easy and practicable performance and the like.

Description

technical field [0001] The invention relates to a fault-tolerant control method for a five-phase inverter dual-motor system based on direct torque control, and belongs to the technical field of motor drive and control. Background technique [0002] Due to the advantages of high efficiency, high torque density, and high power density, permanent magnet synchronous motors (PMSM) have attracted much attention in recent years. In the permanent magnet synchronous motor drive system, the inverter is particularly critical. Generally, a three-phase motor is driven by a three-phase inverter. According to reports, among all the failures of the motor drive system, the failure of power electronic devices accounts for more than 50%. Once the power electronic device fails, the permanent magnet motor traction system will be seriously damaged. [0003] So far, a variety of inverter fault-tolerant schemes have been proposed in academia. However, most of the fault-tolerant schemes are for si...

Claims

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Application Information

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IPC IPC(8): H02P6/04H02P23/30
CPCH02P6/04
Inventor 王伟张景皓程明
Owner SOUTHEAST UNIV
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