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Indirect torque control method for cage-rotor brushless doubly-fed machine (BDFM)

A doubly-fed motor, torque control technology, applied in torque ripple control, estimation/correction of motor parameters, etc., can solve problems such as large torque ripple and large winding current harmonics, and achieves less motor parameters and more efficient solutions. The effect of large harmonic current of control winding and simple system control method

Inactive Publication Date: 2011-09-21
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0003] Proposal of the problem: Aiming at the shortcomings of large control winding current harmonics and large torque ripple in the direct torque control system of brushless doubly-fed motor at low frequency, an indirect torque control method for brushless doubly-fed motor with cage rotor is proposed. Methods

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  • Indirect torque control method for cage-rotor brushless doubly-fed machine (BDFM)
  • Indirect torque control method for cage-rotor brushless doubly-fed machine (BDFM)
  • Indirect torque control method for cage-rotor brushless doubly-fed machine (BDFM)

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Embodiment Construction

[0017] The specific embodiment of the present invention is described in further detail below:

[0018] Such as figure 1 , to realize a method for indirect torque control of cage-type rotor brushless doubly-fed motors according to the present invention is based on the device of brushless doubly-fed motor indirect torque control system, the device is composed of diode rectifier 1, filter capacitor 2. Inverter 3, SVPWM generator 4, comparator 5, speed PI regulator 6, comparator 7, torque PI regulator 8, control winding flux linkage static angle calculation 9, adder 10, comparator 11, Flux linkage PI regulator 12, controlling winding flux linkage increment Calculation 13, Control Winding Voltage , Calculation 14, electromagnetic torque and power winding, control winding flux calculation 15, 3 / 2 converter 16, brushless double-fed motor 17 constitute; six output terminals of SVPWM generator 4 are connected to the control terminal of inverter 3, Output of speed PI regulator 6 ...

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Abstract

The invention provides an indirect torque control method for a cage-rotor brushless doubly-fed machine (BDFM). In the method, particularly a computing method of a magnetic linkage variable angle deltaX of a control winding comprises the following steps: firstly obtaining the frequency of the control winding based on a rotating speed; calculating a static angle deltaXst based on the frequency of the control winding; and obtaining a dynamic angle deltaXd through a PI torque regulator, wherein, the sum of the obtained two angles is the magnetic linkage variable angle deltaX of the control winding within next sampling period Tpwm (trapezoidal pulse width modulation). The indirect torque control method solves problems such as great current harmonic wave of the control winding and great torque ripple in the case of low frequency in the direct torque control method for the BDFM; and the control system only requires resistance of two stator windings and has the advantages of fewer machine parameters, no need of rotational coordinate transformation, capability of realizing control of electromagnetic torque and magnetic linkage of the cage-rotor BDFM under a static coordinate system, simple control method and obvious effect.

Description

technical field [0001] The present invention is related to an indirect torque control method of a cage-type rotor brushless doubly-fed motor, more specifically a method based on SVPWM that can be used in The method of indirect torque control of brushless doubly-fed motor realized under the static coordinate system. Background technique [0002] Brushless double-fed motor is a new type of motor that has attracted wide attention in recent years. Its structure is that there are two sets of windings on the stator, namely power windings and control windings, which are powered by the grid and frequency converter respectively; the rotor adopts a special cage or Reluctance structure rotor. The motor is especially suitable for use in large-scale AC speed regulation energy-saving systems and variable-speed constant-frequency wind power generation fields. It has the advantages of being brushless, requiring a small inverter capacity and adjustable power factor. With the resolution of...

Claims

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Application Information

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IPC IPC(8): H02P6/10H02P23/14
Inventor 张爱玲贾文霞赵荣理路秀芬
Owner TAIYUAN UNIV OF TECH
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