Open-circuit unified fault-tolerant control method for five-phase permanent magnet fault-tolerant motor control drive system

Abstract

The invention discloses an open-circuit unified fault-tolerant control method of a five-phase permanent magnet fault-tolerant motor vector and direct torque control drive system. The core part of the control method is a unified control strategy for open-circuit faults. The principle structure of the unified control strategy for open-circuit faults includes obtaining high-quality torque reference, obtaining AC-DC axis reference voltage, analyzing fault-tolerant mechanism to obtain fault-tolerant current, and based on fault-tolerant mechanism. To obtain the fault winding voltage, according to the back EMF to obtain the fault tolerance voltage. The invention essentially reveals the fault-tolerant mechanism, and based on the pulse width modulation CPWM mode, proposes a unified fault-tolerant control strategy for open-circuit faults suitable for vector control and direct torque control drive systems, and effectively solves the fault-tolerant control corresponding to various new basic control algorithms. The program will also change and complicate matters accordingly.

Description

technical field [0001] The invention belongs to the technical field of multi-phase motor fault-tolerant control, in particular to an open-circuit unified fault-tolerant control method for a five-phase permanent magnet fault-tolerant motor vector and direct torque control drive system. Background technique [0002] With the increasingly prominent global environmental problems, electric vehicles have received more and more attention. As a passenger-carrying device, the safety and reliability of electric vehicles are of paramount importance. Multiphase permanent magnet motors have the advantages of high efficiency, high power density, wide speed range, low torque ripple and strong fault tolerance, and have been widely concerned and applied in electric vehicles, hybrid vehicles and other electric drive fields. Vector control (VC) and direct torque control (DTC) have attracted much attention because of their high driving performance. However, the failure of the motor drive syst...

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Problems solved by technology

In order to overcome the problems caused by hysteresis comparative control, the document "Fault-tolerant direct torque control of five-phaseFTFSCW-IPM motor based on analogous three-phase SVPWM for electric vehicle applications" (IEEE Transaction on Vehicular Technology, 2017) aimed at five-phase permanent Magneto one-phase open-circuit fault, the corresponding SVPWM fault-tolerant control method is proposed, which overcomes the shortcomings of the fault-tolerant control system based on hysteresis control, but this type of fault-tolerant control strategy is based on voltage vector reconstruction after the fault, and the algorithm is relatively complicated Good for engineering

To this end, the document "Remedial field-oriented control of five-phase fault-tolerant permanent-magnet motor by using reduced-order transformation matrices" (IEEE Transaction on Industrial Electronics, 2017) and the Chinese invention patent "A five-phase permanent magnet linear motor with one-phase open-circuit fault tolerance Direct Thrust Control Method" (Patent No. CN201810025607.3) proposes a CPWM fault-tolerant method based on VC and DTC respectively. It does not need to reconstruct the voltage vector after a fault. However, due to the use of two sets of coordinate transformation matrices, the normal operation of the motor and the fault Two sets of independent control algorithms are used in fault-tolerant operation, and the simplified controller algorithm and minimized reconfiguration of the control system during faults have not been realized in essence.

Generally speaking, the existing CPWM fault-tolerant control methods do not reveal the fault-tolerant mechanism in essence. With the emergence of various new algorithms in recent years, the corresponding fault-tolerant control schemes will also be varied and complicated.

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