Method for suppressing voltage saturation out-of-control control of permanent magnet synchronous motor controller of new energy automobile

Abstract

The invention relates to a method for suppressing voltage saturation out-of-control control of a permanent magnet synchronous motor controller of a new energy automobile. The method comprises the steps of setting a voltage utilization rate threshold k; querying Idq_Map according to a Vcu torque instruction to obtain corresponding d-axis reference current Id_Map and q-axis reference current Iq_Map;calculating an adjustment current [delta]Is according to the current voltage vector amplitude and a control strategy; and calculating to obtain output reference currents Id_ref and Iq_ref according to the current motor output power and the adjustment current [delta]Is. According to the invention, the method for suppressing voltage saturation out-of-control control of permanent magnet synchronousmotor controller of the new energy automobile is adopted, an anti-saturation control strategy of the permanent magnet synchronous motor is provided, the strategy is based on calibration of flux weakening control, under the premise that the output torque precision is ensured to the maximum extent, it is guaranteed that when the motor is started to a high speed in a cold state, the output voltage ofan inverter is not saturated, and the control safety and reliability of the motor are improved.

Description

technical field [0001] The invention relates to the field of new energy vehicles, in particular to the field of synchronous motor control, and specifically refers to a method for controlling a permanent magnet synchronous motor controller of a new energy vehicle to suppress voltage saturation and runaway control. Background technique [0002] Energy conservation, emission reduction and low-carbon travel are increasingly becoming global topics in the 21st century. New energy vehicles use secondary energy as the power source, and are environmentally friendly during use. It is gradually becoming a trend to replace traditional internal combustion vehicles that use fossil fuels. Due to permanent magnet synchronization The advantages of high power density and wide speed range of the motor are widely used as the main drive motor in new energy vehicles. In addition, my country's rich rare earth resources provide a guarantee for the development of new energy vehicles in the country. ...

AI Technical Summary

Problems solved by technology

During the long-term calibration process, the rotor of the motor is in a hot state and the temperature is high. Due to the characteristics of the permanent magnet material, the flux linkage of the permanent magnet of the rotor changes greatly with the temperature, resulting in output voltage saturation of the inverter when it is started from a cold state to a high speed. , output torque out of control and other serious safety faults, affecting driving safety

[0004] The traditional solution to the high-speed output voltage saturation of the motor is to leave enough margin during the calibration process to ensure that the inverter will not appear voltage saturation in the cold state and hot state of the motor, but this method not only increases the calibration workload but also in To a certain extent, the output efficiency of the motor is reduced

Images