A fault-tolerant control method for maximum torque-current ratio of five-phase permanent magnet motor based on svpwm

Abstract

The invention discloses a method for fault-tolerant control of the maximum torque current ratio of a five-phase permanent magnet motor based on SVPWM, which includes the following steps: detecting the motor speed, setting the given speed ω * and feedback speed ω m For comparison, use the PI controller to obtain the given current i of the q-axis qref ; Transform the sampled phase current through a reduced-order matrix transformation to obtain the d-q-z axis feedback current i df , i qf , i zf ; Calculate the α‑β axis voltage u in the fault state α , u β ; will u α , u β and i α , i β Input to the maximum torque-to-current ratio (MTPA) fault-tolerant module, and use the space vector signal injection method to solve the d-axis given current i when the motor is running fault-tolerant dref ;Compare the given current of the d-q-z axis with the feedback current, obtain the given voltage of the d-q-z axis through the PI controller, and use the Park transformation matrix to inject high frequency into the given voltage of the α-β axis Signal, input the α-β-axis voltage and z-axis voltage containing high-frequency signals to the fault-tolerant SVPWM module to generate switching signals, and control the motor through the inverter to realize the maximum torque-current ratio fault-tolerant control of the five-phase permanent magnet motor.

Description

technical field [0001] The invention relates to the technical field of multi-phase motor fault-tolerant control, in particular to a method for fault-tolerant control of the maximum torque current ratio of a five-phase permanent magnet motor based on SVPWM. 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] Because of its high torque density, high efficiency, and high reliability, embedded permanent magnet motors are increasingly used in electric vehicle traction, aerospace, and ship propulsion systems. At the same time, a stable and reliable motor drive system is particularly important for some occasions that require high reliability, such as aircraft and electric vehicles. Therefore, high-reliability fault-tolerant control methods for permanent magnet motors have received extensive attention. [0003] In recent years, scholars at home and ab...

AI Technical Summary

Problems solved by technology

However, the calculation methods of these fault-tolerant currents are generally based on i d The control algorithm of = 0 is suitable for surface-mounted permanent magnet motors. For embedded permanent magnet motors, the reluctance torque of embedded permanent magnet motors is not fully utilized to improve the output torque performance of the motor during fault-tolerant operation , and the advantage of the wide speed range of the embedded permanent magnet motor cannot be reflected in the fault-tolerant operation

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