A Direct Torque Control Method Based on Duty Cycle Control

A technology of direct torque control and duty cycle, which is applied to control electromechanical brakes, control systems, control generators, etc., and can solve problems such as not considering the impact

Active Publication Date: 2021-03-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods do not consider the influence of the specific direction of the selected effective voltage vector on the real-time torque change, and the angle change caused by the lag of the control time

Method used

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  • A Direct Torque Control Method Based on Duty Cycle Control
  • A Direct Torque Control Method Based on Duty Cycle Control
  • A Direct Torque Control Method Based on Duty Cycle Control

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Embodiment Construction

[0056] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0057] In this embodiment, first, a hidden pole permanent magnet synchronous motor (permanent magnetsynchronous motor, PMSM) model is established in Simulink, and the dead time t is set in the control loop d . Since it takes time from collecting the signal to calculating and outputting the duty ratio, in order to better simulate the actual s...

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Abstract

The invention discloses a direct torque control method based on duty cycle control, which comprises the steps of S1, collecting data of the rotation speed [omega], rotation angle [theta] and three-phase current isa, isb and isc of a motor; S2, converting the three-phase current isa, isb and isc into a rotating coordinate system to obtain current isd and isq; S3, calculating the electromagnetic torque Te, d-axis flux linkage [psi]d, q-axis flux linkage [psi]q and amplitude [psi]s of the stator flux linkage; S4, calculating a sector in which the stator flux linkage is located; S5, calculating areal-time stator flux linkage instruction value, and acquiring a torque reference value according to rotation speed PI control; S6, selecting a voltage vector ui by using a table lookup method; S7, calculating an included angle [theta]psid between the stator flux linkage at the current moment and the d-axis at the action moment; S8, calculating an included angle [theta]ud between the effective voltage vector ui and the d-axis at the action moment according to the selected effective voltage vector ui, the rotation speed [omega]r, the rotation angle [theta]r; and S9, calculating the duty cycle hof the selected effective voltage vector, and calculating the input pulse of each switch tube of an inverter. The direct torque control method improves the calculation method of the duty cycle, and can effectively reduce the amplitude of harmonic components of the torque and rotation speed in a low frequency band.

Description

technical field [0001] The invention relates to the technical field of direct torque control of permanent magnet synchronous motors, in particular to a direct torque control method based on duty cycle control. Background technique [0002] Permanent magnet synchronous motor has the advantages of high power density, high operating efficiency, simple and reliable structure, excellent control performance, etc., and is widely used in chemical industry, household appliances and other fields. At present, the AC speed regulation methods of permanent magnet synchronous motors mainly include direct torque control and vector control. Compared with vector control, the direct torque control method is simple and the torque response is fast, but the torque fluctuation is large and there are large torque harmonics. Direct torque control includes traditional hysteresis comparative direct torque control, direct torque control based on duty cycle control, and direct torque control based on s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/30
CPCH02P2207/05H02P21/30
Inventor 周永池杨志坚
Owner SOUTH CHINA UNIV OF TECH
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