Current internal-model decoupling controller of open-winding permanent-magnet synchronous motor

Abstract

The invention discloses a current internal-model decoupling controller of an open-winding permanent-magnet synchronous motor. A common three-phase permanent-magnet synchronous motor stator winding is subjected to circuit opening, so that six end leads are led out and respectively correspondingly connected with a first inverter and a second inverter; only one direct-current power supply supplies power for the current internal-model decoupling controller of an open-winding permanent-magnet synchronous motor, so that after a, b and c-phase sampling currents ia, ib and ic of a motor stator winding pass through the current internal-model decoupling controller, a d-axis modulation voltage u*d and a q-axis modulation voltage u*q are obtained, and then the motor is controlled by using a voltage space vector pulse-width modulation strategy. The open-winding permanent-magnet synchronous motor enables the harmonic content of an output voltage to be reduced under a lower switching frequency, and under the condition that the space is small and the battery capacity is limited and under the limitation of the voltage/current capacity of a power switch device, the total power and loading capacity of a system can be enhanced. On the basis of keeping the structure advantages of the novel motor, the influence on the system caused by mismatch errors arising from system parameters is reduced, the robustness of the system is improved, and the controller is easy to adjust.

Description

technical field [0001] The invention relates to a novel open-winding permanent magnet synchronous motor current internal model decoupling controller, which can be applied to the motor drive field for electric vehicles, and particularly relates to high-voltage and high-power drive occasions. Background technique [0002] At present, the motor drive system used in electric vehicles generally consists of power batteries and capacitors connected in parallel to form a power source, which is connected to one end of the AC three-phase winding in the drive motor through the drive inverter, and the other end is connected in star form. The nominal voltage provided by the power battery is generally about 300v. In the case of motor drive that requires higher power and higher torque, it can be realized by increasing the capacity of the power battery and increasing the current capacity of the power switching device. The two commonly used implementations of high-power motor drive systems ...

AI Technical Summary

Problems solved by technology

[0003] Technical problem: The present invention is aimed at the driving occasions of electric vehicles and other motors that require relatively high power and relatively large torque. Under the limitation of vehicle battery capacity and power switch voltage and current capability, the driving power level is low and common mode voltage exists. And the traditional PID controller has poor robustness, large overshoot, slow response speed and other dynamic performance problems due to incomplete decoupling of the d and q axis currents, and many adjustable parameters, which are difficult to adjust. A new type of controller is proposed. The open-winding permanent magnet synchronous motor current internal model decoupling controller realizes the application of permanent magnet synchronous motors in high-voltage and high-power occasions, and improves the speed regulation performance of electric vehicles to a certain extent

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