Permanent magnet synchronous motor simulator considering nonlinear characteristics and control method thereof

Abstract

The invention discloses a permanent magnet synchronous motor simulator considering nonlinear characteristics and a control method thereof. The method includes the steps of outputting three-phase voltages and currents, and obtaining q-axis and d-axis voltage and current components respectively through coordinate transformation and combined with a current cycle electrical angle; obtaining q-axis andd-axis counter electromotive force (EMF) components; establishing a nonlinear permanent magnet synchronous motor mathematical model, taking the q-axis and d-axis voltages and q-axis and d-axis counter EMF as the input to calculate the mechanical angular velocity, electrical angle, motor rotation speed, and q-axis and d-axis currents of a next cycle, and taking the q-axis and d-axis currents as command currents for the closed-loop control of the next cycle; and regulating differences between the command currents and the q-axis and d-axis current components by using a current regulator, and connecting the reference voltage obtained after the inverse Park transformation of the results to an SVPWM modulation module such that a three-phase full-bridge converter actually outputs the command currents. According to the invention, the operation characteristics of various working conditions under the condition of non-linear counter EMF can be effectively simulated, and the tracking without static error of high frequency signals contained in the higher harmonic currents can be achieved.

Description

Technical field [0001] The invention relates to a permanent magnet synchronous motor simulator considering nonlinear characteristics and a control method thereof, belonging to the technical field of power electronics. Background technique [0002] At present, for the modeling and simulation of permanent magnet synchronous motors, ideal back-EMF permanent magnet synchronous motors are often used as simulation or modeling objects. For example, the Chinese patent "A Power Simulation Method of Permanent Magnet Synchronous Motor" (Publication Date: 2013.12.25, Publication Number: CN103472391A) first established the mathematical model of the permanent magnet synchronous motor in the case of sinusoidal back EMF, and the output The voltage is used as the input of the mathematical model of the permanent magnet synchronous motor, the output current of the permanent magnet synchronous motor in this state is calculated, this current is used as the reference current of the three-phase full br...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a permanent magnet synchronous motor simulator and its control method considering nonlinear characteristics, and solve the problem that the existing permanent magnet synchronous motor simulation technology is based on the sine wave ideal The linear model of the back EMF simulates various motor working conditions without considering the influence of the nonlinear back EMF characteristics on the accuracy of the motor simulation, and realizes the problem of tracking the high-frequency current signal containing harmonics without static error

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