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Direct torque control system and method of brushless double-fed motor

A technology of direct torque control and doubly-fed motors, applied in direct torque control, control systems, AC motor control, etc., can solve the problems of large torque ripple and the inability to realize complete compensation of torque and flux linkage errors, etc., to achieve Effects of reducing torque ripple, compensating flux linkage error, and improving performance

Inactive Publication Date: 2017-12-01
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional direct torque control uses a double hysteresis controller to control torque and flux linkage separately, so only one effective voltage vector works in each sampling cycle, and it is impossible to fully compensate for torque and flux linkage errors. resulting in a larger torque ripple

Method used

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  • Direct torque control system and method of brushless double-fed motor
  • Direct torque control system and method of brushless double-fed motor
  • Direct torque control system and method of brushless double-fed motor

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Embodiment Construction

[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0036] Such as figure 1 As shown, a brushless double-fed motor direct torque control system, including: flux and torque observer, torque comparator, flux comparator, direct torque control unit, duty cycle fuzzy controller , Duty cycle time calculator, sawtooth wave generator, duty cycle control unit, DC power supply, inverter and brushless double-fed motor;

[0037] The flux linkage and torque observer is used to calculate flux linkage, torque, and control winding flux linkage angle;

[0038] The flux linkage and torque output by the flux linkage and torque observer are respectively compared with a given flux linkage and a given torque to obtain a flux linkage deviation and a torque deviation;

[0039] The output end of the flux comparator, the output...

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Abstract

The invention discloses a direct torque control system and method of a brushless double-fed motor. Electromagnetic torque deviation, flux linkage amplitude deviation and a position where a flux linkage angle is located in a sector are fuzzed and then sent to a fuzzy controller, a duty ratio of an effective voltage vector with in a control period is determined according to an established fuzzy control rule, and the torque and the flux linkage pulse during direct torque control are reduced by respective action of the effective voltage vector and a zero vector for different time. The direct torque control system and method has the advantages that the torque pulse is effectively reduced on the basis of maintaining the advantage of traditional direct torque control, and the performance of the direct torque control is improved. The direct torque control system and method is particularly suitable for variable-frequency speed regulation of the brushless double-fed motor and application of a wind power generation control system.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a system and method for direct torque control of a brushless doubly-fed motor. Background technique [0002] Brushless double-fed motor is a new type of motor developed in recent years. The brushless double-fed motor has two sets of three-phase symmetrical stator windings and one rotor winding. One set of stator windings is the power winding, and the other set of stator windings is the control winding. winding. The basic principle of brushless double-fed motor operation is that the specially designed rotor makes the two sets of stator windings produce different pole pairs of rotating magnetic fields to interact indirectly, and the interaction can be controlled to achieve energy transfer. It has the common advantages of asynchronous motors and synchronous motors. Compared with ordinary asynchronous motors, it has the characteristics of simple structure, reliable operation, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P23/04H02P23/30H02P27/12H02P23/00
CPCH02P23/04H02P23/0013H02P23/30H02P27/12
Inventor 李冰刘石
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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