Anti-saturation current regulator and method for vehicle permanent magnet synchronous motor

Abstract

The invention discloses an anti-saturation current regulator and method for a vehicle permanent magnet synchronous motor. The anti-saturation current regulator comprises a d-axis current regulator anda q-axis current regulator, the output ends of the d-axis current regulator and the q-axis current regulator are respectively connected with an overmodulation device, an anti-saturation device and asaturation judgment device, and the output end of the overmodulation device is connected with an output voltage reconstruction device. The method comprises the steps of calculating output instructionsof the d-axis current regulator and the q-axis current regulator, calculating an output voltage amplitude |Vs_ref|, comparing the |Vs_ref| with Vs_lmt, correcting the amplitude and the phase of the voltage instruction, and reconstructing an actual d-axis voltage Vd_real and an actual q-axis voltage Vq_real according to the correction voltage. According to the technical scheme, by introducing a new anti-saturation algorithm and reasonably designed control parameters, the motor control system is ensured to have a high bus voltage utilization rate, the stability and the dynamic response of current control of high-speed weak magnetic area operation of the motor system are improved, the current regulator is prevented from losing the regulation capability due to saturation, and important safetyaccidents are avoided.

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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