Magnetic field reconstruction method for eliminating torque pulsation of doubly-fed induction motor

A doubly-fed induction motor and torque pulsation technology, which is applied in the control of generators, motor generators, electromechanical brakes, etc., can solve the problems of large influence on motor control accuracy and over-reliance on accurate understanding of control

Inactive Publication Date: 2012-08-29
GUODIAN LONGYUAN ELECTRICAL
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Problems solved by technology

In addition, the accuracy of motor control is greatly affected by the accuracy of the motor model parameters, making the control of the motor excessively dependent on the precise understanding of the equivalent circuit of the motor

Method used

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  • Magnetic field reconstruction method for eliminating torque pulsation of doubly-fed induction motor
  • Magnetic field reconstruction method for eliminating torque pulsation of doubly-fed induction motor
  • Magnetic field reconstruction method for eliminating torque pulsation of doubly-fed induction motor

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Embodiment Construction

[0029] The present invention is described below with reference to the accompanying drawings.

[0030] To obtain the distribution of the magnetic flux density, the motor is first modeled using a finite element solver, the commercial software Infolytica Magnet used in this invention. this thought in figure 1 As shown in , the input is the stator three-phase current and the rotor position, and the output is the normal and tangential part of the magnetic field density. At any rotor position, the composite normal and tangential parts of the air gap magnetic flux density can be obtained by finite element analysis, and the corresponding force density f is calculated by using the electromagnetic field stress tensor (Maxwell Stress Tensor) method.

[0031] Due to the influence of system unbalance, in the doubly-fed induction motor (the circuit diagram of the doubly-fed induction motor is shown in figure 2 Shown) The magnetomotive force in the air gap will generate an undesired part....

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Abstract

The invention relates to a magnetic field reconstruction method for eliminating torque pulsation of a doubly-fed induction motor. In order to eliminate the torque pulsation problem of the doubly-fed asynchronous induction motor caused by electric network voltage unbalance and electric network voltage harmonic waves to the greatest degree, the invention provides the motor magnetic field reconstruction method. On the basis of the structure, the dimension, the materials, the electric parameters and the like of the actual motor, Infolytica Magnet electromagnetic field simulation software is adopted for studying the torque generation from the motor magnetic field angle, and in addition, the unexpected torque pulsation is eliminated through the optimization on the rotor current. As an alternative excitation scheme, the method avoids the control precision problem caused by motor equivalent model inaccuracy. The magnetic field reconstruction method has the characteristics that the calculation speed is high, the torque pulsation elimination effect of the doubly-fed induction motor is obvious, and the like. The magnetic field reconstruction method can be used for solving the vibration problem of the doubly-fed induction motor for wind power generation caused by electric network voltage unbalance or electric network voltage harmonic waves.

Description

technical field [0001] The invention relates to a magnetic field reconstruction method for eliminating torque ripple of a doubly-fed induction motor, in particular to a field reconstruction method (Field Reconstruction Method, FRM) to solve problems caused by unbalanced grid voltage or grid voltage of a doubly-fed induction motor for wind power generation. Approach to vibration problems caused by voltage harmonics. Background technique [0002] The doubly fed induction generator (Doubly Fed Induction Generator, DFIG) has the independent adjustment ability of active and reactive power, and can realize the variable speed and constant frequency operation of the maximum wind energy tracking. The cost has become the mainstream generator type in the current development and utilization of wind energy. However, the system imbalance and system harmonics caused by the grid will deteriorate the performance of the motor and generate unwanted torque ripple. These torque ripples will ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/05
Inventor 朱峰
Owner GUODIAN LONGYUAN ELECTRICAL
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