An anti-saturation current regulator and method for a permanent magnet synchronous motor for a vehicle

Abstract

The invention discloses an anti-saturation current regulator and a method for a permanent magnet synchronous motor for vehicles, comprising a d-axis current regulator and a q-axis current regulator, wherein the output ends of the d-axis current regulator and the q-axis current regulator are respectively connected with The overmodulation device, the anti-saturation device, and the saturation judgment device are connected, and the output end of the overmodulation device is connected with the output voltage reconstruction device. The method includes: calculating the output commands of the d-axis and q-axis current regulators; calculating the output voltage amplitude |V s_ref |; will |V s_ref | with V s_lmt Compare; correct the amplitude and phase of the voltage command; reconstruct the actual d-axis voltage V according to the corrected voltage d_real and the q-axis voltage V q_real . By introducing a new anti-saturation algorithm and designing reasonable control parameters, this technical solution ensures that the motor control system has a high bus voltage utilization rate, improves the stability and dynamic response of the current control in the high-speed field weakening region of the motor system, and prevents current regulation. The device loses its ability to adjust due to saturation, avoiding important safety accidents.

Description

technical field [0001] The invention relates to the field of driving electric vehicles, in particular to an anti-saturation current regulator and method of a permanent magnet synchronous motor for vehicles. Background technique [0002] Electric vehicles generally use permanent magnet synchronous motors as drive devices. Its working process is as follows: the whole vehicle sends the torque command to the motor controller, the motor controller converts the torque command into the corresponding current command, calculates the voltage command in response to the current through the motor control algorithm, and finally through the pulse width modulation ( PWM) technology converts the DC power from the power battery into AC power to drive the motor to complete the torque response. It can be seen from the above workflow that the process of the motor to achieve torque output is essentially current output, so current control plays a vital role in the electric vehicle motor controlle...

AI Technical Summary

Problems solved by technology

[0005] The invention mainly solves the technical problem that the original current anti-saturation technology cannot be directly applied to the current control with over-modulation operation, and provides an anti-saturation current regulator and method of a permanent magnet synchronous motor for vehicles. By introducing a new anti-saturation The algorithm and design of reasonable control parameters can ensure that the motor control system has a high bus voltage utilization rate, improve the stability and dynamic response of the current control of the motor system in the high-speed field weakening area, and prevent current regulation when the voltage margin is small. The regulator loses its regulation ability due to saturation, avoiding important safety accidents

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