Permanent magnet synchronous motor vector control method based on voltage feedforward compensation strategy

Abstract

The invention discloses a permanent magnet synchronous motor vector control method based on a voltage feedforward compensation strategy. According to the method, firstly, under a synchronous rotatingcoordinate system, a corresponding mathematical model is established for the permanent magnet synchronous servo motor; then, a speed current double-closed-loop control method is adopted, the couplingamount generated in the voltage component during rotation of the permanent magnet synchronous motor is compensated through a voltage feedforward compensation regulator by using a feedforward amount, and d-axis voltage and q-axis voltage under a rotating coordinate system are obtained; and finally, through Park transformation, a space vector pulse width modulation (SVPWM for short) technology and Clark transformation, good control on the permanent magnet synchronous motor is realized. The control performance of the motor system is improved for the problem that the permanent magnet synchronous motor cannot meet the control requirement of the system by independently utilizing a speed ring under the working conditions of high-speed operation, frequent forward and reverse conversion and the like.

Description

technical field [0001] The invention relates to the technical field of permanent magnet synchronous motor control, in particular to a voltage feedforward compensation method for vector control of permanent magnet synchronous motors. Background technique [0002] Due to the advantages of simple structure, small size, high efficiency, high power density, fast response speed and high safety, permanent magnet synchronous motors have gradually replaced DC motors in some drive fields and are widely used in flexible manufacturing systems. , wind power generation, new energy vehicles and many other places. Therefore, it has important application value to the control strategy of permanent magnet synchronous motor. [0003] At present, the control strategies for permanent magnet synchronous motors mainly include constant voltage frequency ratio control, direct torque control, nonlinear intelligent control and vector control. Although constant voltage frequency ratio control can obta...

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Problems solved by technology

[0004] In view of the above problems, in order to overcome the influence of load changes and other disturbances on motor control, especially in the occasions of high-speed operation and frequent forward and reverse conversion, the traditional vector control method cannot meet the system control requirements. The present invention provides A compensation strategy based on voltage feed-forward is proposed. By introducing a current loop, the coupling amount generated in the voltage component of the permanent magnet synchronous motor is compensated by the feed-forward value of the voltage feed-forward compensation regulator to form a relationship between the motor speed and the motor current. Double closed-loop feedback to improve the control performance of the motor system

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