Six-phase alternating current motor system and control method and control device thereof

Abstract

The invention discloses a control method of a six-phase alternating current motor; the control method comprises the following steps that current given values and current feedback values of a d-axis and a q-axis of each set of winding are determined; a direct-current power supply voltage value of each converter module is determined; the voltage control components of each set of winding are calculated according to the current given values and the current feedback values by adopting a preset control algorithm; a preset decoupling expression is adopted, the voltage decoupling quantity comprising an internal decoupling term of the winding and a cross decoupling term between the two sets of windings is calculated according to the current feedback values; the voltage control component and the voltage decoupling quantity are summed to calculate the voltage control total quantity; and according to the voltage control total quantity and the direct current power supply voltage value of each set of winding, spatial vector modulation is carried out to generate pulse control signals, and the pulse control signals are sent to converter modules corresponding to each set of windings respectively. According to the method, the winding current can be comprehensively and effectively decoupled, so that the control performance is effectively improved. The invention further discloses a six-phase alternating current motor system and a control device thereof, and also has the 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...

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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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