Salient pole type synchronous motor harmonic current decoupling control system and method

Abstract

The invention relates to a salient pole type synchronous motor harmonic current decoupling control system and method, and the system comprises a harmonic current detection module which obtains 6k + / -1harmonic current feedback, and k is a positive integer; a linear transformation module, used for respectively carrying out linear transformation on 6k + / -1 harmonic current reference and 6k + / -1 harmonic current feedback under the harmonic reference coordinate system to obtain new harmonic current; a harmonic current decoupling control module, used for carrying out independent decoupling controlon each harmonic current according to error adjustment between harmonic current reference and harmonic current feedback after linear transformation; an inverse linear transformation module, used for performing inverse linear transformation on the output voltage to obtain a control output voltage under a harmonic reference coordinate system; and a motor control module, using the control output voltage as a reference value of the output voltage of the salient pole type synchronous motor to control the work. Compared with the prior art, the dynamic decoupling control of the harmonic current is realized, the control precision and the response speed of the harmonic current are improved, and meanwhile, the design of a decoupling controller is simplified by utilizing linear transformation.

Description

technical field [0001] The invention relates to the technical field of synchronous motor control, in particular to a harmonic current decoupling control system and method of a convex-level synchronous motor. Background technique [0002] Built-in permanent magnet synchronous motors are usually used as drive motors due to their advantages such as high efficiency, high power density, and wide speed range, and have been widely used in electric vehicles and other fields. However, due to the cogging effect of the motor, the back electromotive force distortion caused by the harmonics of the permanent magnet magnetic force, and the dead zone effect of the inverter, there is a harmonic current of 6k±1 times the fundamental frequency in the stator winding. If not controlled, harmonic current will cause additional copper loss and iron loss, and at the same time generate torque ripple, affecting motor efficiency, noise and torque output stability. [0003] The permanent magnet synchro...

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Problems solved by technology

However, the literature (Zhong Zaimin, Jiang Shang, Kang Jinsong, Chen Xueping, Zhou Yingkun, "Coupling Model and Feedforward Control of Harmonic Voltage and Current of Permanent Magnet Synchronous Motor," Journal of Electrotechnical Society, vol.32, no.18, pp.131 -142,2017.) pointed out that for the convex-stage permanent magnet synchronous motor, there is coupling between the positive and negative sequence harmonic currents of the same frequency, which affects the control performance of the harmonic current

The above-mentioned traditional harmonic current control method does not design a controller based on the dynamic equation of the harmonic current, ignores the dynamic coupling between the harmonics of the convex synchronous motor, and cannot realize the complete decoupling between the harmonic currents, thus affecting the harmonic current control Accuracy and Response Speed

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