Direct torque control method for five-phase permanent magnet synchronous motor with one-phase fault

A technology of direct torque control and permanent magnet synchronous motors, which is applied in motor control, motor generator control, AC motor control, etc., can solve problems such as complex control process, achieve simplification of control process, easy implementation, and normal operation Effect

Active Publication Date: 2022-05-17
XIAN UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a direct torque control method for a five-phase permanent magnet synchronous motor lacking a phase fault, which solves the problem that in the prior art, when a five-phase PMSM lacks a phase fault, its DTC needs to re-partition the stator flux linkage and switch table design, making the control process more complicated

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  • Direct torque control method for five-phase permanent magnet synchronous motor with one-phase fault
  • Direct torque control method for five-phase permanent magnet synchronous motor with one-phase fault
  • Direct torque control method for five-phase permanent magnet synchronous motor with one-phase fault

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Embodiment Construction

[0076] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0077] The direct torque control method of the five-phase permanent magnet synchronous motor in the present invention is implemented according to the following steps:

[0078] Step 1. According to the switching state of each bridge arm of the five-phase inverter and the DC bus voltage U dc Get the phase voltage of each stator of the five-phase PMSM, and then transform the A-B-C-D-E natural coordinate system to α through the static coordinate transformation matrix of the five-phase PMSM during normal operation 1 -β 1 -α 3 -β 3 -0 coordinate system, get α 1 -β 1 and alpha 3 -β 3 The voltage vector distribution diagram of the subspace is shown in Fig. 2(a) and Fig. 2(b);

[0079] Step 1 is as follows:

[0080] Step 1.1, the topology of the five-phase PMSM main circuit is as follows figure 1 As shown, for a five-phase inverter, the swit...

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Abstract

The invention discloses a direct torque control method for a five-phase PMSM lacking one phase fault. When the five-phase PMSM is in normal operation, at α 1 ‑β 1 Subspace Synthesis Virtual Vector Elimination α 3 ‑β 3 Harmonic voltage in the subspace; when a five-phase PMSM fails with one phase missing, the virtual vectors after the fault are corrected, and the voltage vectors and their proportions corresponding to the ten virtual vectors corrected after the fault are obtained; at the same time, in order to achieve the maximum DC bus voltage utilization ratio, the voltage vectors corresponding to the ten largest magnitude virtual vectors and their proportions are obtained, and then α 1 ‑β 1 The distribution of ten maximum magnitude virtual vectors in the subspace; and through the post-fault voltage vector switch table, the appropriate voltage vector is selected to realize the direct torque control of five-phase PMSM with one phase missing. The invention solves the problem that in the prior art, when a five-phase PMSM lacks one phase fault, its DTC needs to re-design the stator flux linkage partition and switch table, which makes the control process more complicated.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a direct torque control method for a five-phase permanent magnet synchronous motor when one phase is missing. Background technique [0002] With the continuous development and improvement of modern power electronics technology and motor control theory, domestic and foreign scholars have conducted a lot of research on five-phase permanent magnet synchronous machine (PMSM). Compared with the traditional three-phase motor drive system, the multi-phase motor drive system not only has advantages in performance, but also has functions that the former cannot achieve. The multi-phase (phase number > 3) motor drive system has low-voltage high-power Reliability, low torque ripple and suitable for fault-tolerant operation have received more and more attention and recognition in aerospace, ship propulsion, electric vehicles and other fields. The five-phase PMSM applies ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/30H02P21/14H02P25/022H02P29/028H02P6/34
CPCH02P21/30H02P21/14H02P25/022H02P29/028H02P6/34Y02T10/72
Inventor 周长攀刘海峰景国秀孙向东刘坛
Owner XIAN UNIV OF TECH
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