Torque feedforward control method and control device for dual pwm permanent magnet electric drive system

Abstract

The present invention provides a torque feedforward control method of a double-PWM permanent magnet electric driving system. According to the control method and control device, the load torque of a motor is converted into given torque current corresponding to the output torque of a generator, so that the output power of the generator can be rapidly changed, and therefore, the load torque response time of the motor can be shortened. According to a traditional double-PWM permanent magnet electric driving system, when the load torque of the motor changes, corresponding adjustment information is provided only after the voltage of a direct-current bus-bar changes, so that the output power of the generator is adjusted, and as a result the problem of the long load torque response time of the motor is brought about, while, with the torque feedforward control method and control device adopted, the problem can be solved. The invention also provides a torque feedforward control device of the double-PWM permanent magnet electric driving system. According to the control device, a torque observer and a torque current converter connected with the torque observer are only required to be additionally arranged between the motor and generator of the existing system, so that torque feedforward can be realized. The control device has the advantages of simple structure, convenient maintenance of the system and high response speed and convenience in use and generalization.

Description

technical field [0001] The present invention relates to the technical field of motor control, and more specifically, to a torque feedforward control method and a control device for a dual PWM permanent magnet electric drive system. Background technique [0002] In power conversion devices, the PWM method has been widely used as a control method to obtain a desired output voltage. The PWM method is a method of conducting a switching element at a conduction interval or conduction duration proportional to a voltage command. In Such methods are well known in the prior art as the carrier comparison method or the space vector method. [0003] In recent years, with the rapid development of vehicle technology, dual PWM permanent magnet electric drive systems have been widely used in vehicle drive systems due to their high input power factor, bidirectional flow of electric energy, and environmental protection. However, the vehicle system needs to perform operations such as accelerat...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a dual PWM permanent magnet electric drive system torque feedforward control method and its control device with fast torque response speed, low system cost and convenient energy management, so as to solve the problem of the existing dual PWM electric drive system in the vehicle system Existing technical problems of slow torque response, high system cost and complex energy management

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