A six-phase AC motor system and its control method and control device

Abstract

The application discloses a six-phase AC motor control method, including: determining the current given value and current feedback value of the d-axis and q-axis of each set of windings; determining the DC power supply voltage value of the converter module; adopting preset control The algorithm calculates the voltage control components of each set of windings respectively according to the current given value and the current feedback value; the preset decoupling expression is used to calculate the decoupling item including the internal decoupling item of the winding and the cross decoupling item between the two sets of windings according to the current feedback value. Voltage decoupling amount; sum the voltage control component and voltage decoupling amount to calculate the total voltage control amount; according to the total voltage control amount of each set of windings and the DC power supply voltage value, perform space vector modulation to generate pulse control signals, and send them separately to the converter module corresponding to each set of windings. The application can comprehensively and effectively decouple the winding current, thereby effectively improving the control performance. The application also discloses a six-phase AC motor system and a control device thereof, which also have the above beneficial effects.

Description

technical field [0001] The present application relates to the technical field of six-phase AC motor control, in particular to a six-phase AC motor system and its control method and control device. Background technique [0002] Compared with conventional three-phase AC motors, six-phase AC motors have smaller output torque ripple and higher device reliability, and can achieve high power output under low-voltage power supply conditions, so they are very suitable for electric vehicles , ship propulsion and aerospace and other occasions. [0003] For six-phase AC motors, especially double Y-shifted 30° six-phase AC motors, more harmonic components will be generated in the stator current than those of three-phase AC motors, especially in the case of high voltage and high power. In the prior art, the decentralized vector control method (that is, the two sets of three-phase windings of the six-phase AC motor are regarded as two three-phase AC motors, and the vector control is perf...

AI Technical Summary

Problems solved by technology

[0004] When the six-phase AC motor is running, there are coupling phenomena inside each set of windings and between two sets of windings, which will affect the control performance of the six-phase AC motor

However, in the decentralized vector control of the prior art, either the decoupling process is not performed on the windings, or the decoupling process is only performed on the coupling phenomenon inside the windings without considering the coupling between the two sets of windings, so its control effect remains to be seen. improve

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