Model prediction current control method of permanent magnet synchronous motor

Abstract

The invention discloses a model prediction current control method of a permanent magnet synchronous motor. The method comprises the following steps: obtaining a d-axis current disturbance item and a q-axis current disturbance item; obtaining three-phase current, three-phase line voltage and rotating speed signals of a permanent magnet synchronous motor, and obtaining a d-axis current observation value, a q-axis current observation value, a d-axis current disturbance item observation value and a q-axis current disturbance item observation value by utilizing a linear expansion state observer; obtaining a d-axis output value and a q-axis output value of a disturbance controller, obtaining an inductance prediction value by using an inductance extraction algorithm, and obtaining a d-axis current prediction value and a q-axis prediction current value in combination with an incremental prediction model; and adjusting the switching signal of the permanent magnet synchronous motor by using theinductance prediction value, the d-axis current prediction value and the q-axis prediction current value so as to realize the closed-loop control of the permanent magnet synchronous motor, so that therobustness of a permanent magnet synchronous motor model prediction current control algorithm is improved.

Description

technical field [0001] The invention belongs to the field of permanent magnet synchronous motors, in particular to a model predictive current control method for permanent magnet synchronous motors. Background technique [0002] In recent years, with the continuous development and application of rare earth permanent magnet materials in my country, the performance of permanent magnet synchronous motors in terms of power density and efficiency has surpassed conventional induction motors and DC motors. Therefore, permanent magnet synchronous motors are widely used in industrial fields, such as high-performance CNC machine tools, industrial robots, electric vehicles, etc. A large number of applications in the industrial field put forward higher requirements on the control performance of permanent magnet synchronous motors. In the industry, the permanent magnet synchronous motor control system is not only required to have good steady-state accuracy, but also requires excellent dy...

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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a model predictive current control method of a permanent magnet synchronous motor, which aims to solve the problem of the permanent magnet synchronous motor's electrical The electrical parameters such as armature resistance and armature inductance will change with the change of the working conditions of the permanent magnet synchronous motor, which leads to the technical problem that the robustness of the model predictive current control algorithm of the permanent magnet synchronous motor is too low

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