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Series winding type brushless rotor doubly-fed generator analyzing method

A doubly-fed motor and analysis method technology, applied in the field of power equipment analysis based on multi-physical quantity coupling, can solve the complex electromagnetic characteristics of series-wound rotor brushless doubly-fed motors and hinder the series-wound rotor brushless doubly-fed motor Practical progress and other issues

Inactive Publication Date: 2015-05-20
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the complex electromagnetic characteristics of series-wound rotor brushless doubly-fed motors, there is a lack of effective analysis models and analysis methods for the coupling of various physical quantities of series-wound rotor brushless doubly-fed motors in the prior art, thus hindering the use of series-wound rotors. Practical progress of linear rotor brushless doubly-fed motor

Method used

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  • Series winding type brushless rotor doubly-fed generator analyzing method
  • Series winding type brushless rotor doubly-fed generator analyzing method
  • Series winding type brushless rotor doubly-fed generator analyzing method

Examples

Experimental program
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Effect test

Embodiment 1

[0074] Take the power winding pole pair number p=4 and the control winding pole pair number q=1 as an example of a series wound rotor series wound rotor brushless double-fed motor. figure 1 The flow chart of the analysis method of the series wound rotor brushless double-fed motor, figure 2 It is a schematic diagram of the rotor connection with the number of poles p+q=5. Firstly, establish a two-dimensional model of a series-wound rotor brushless doubly-fed motor and divide it, then define the material properties of each structural part, set the excitation conditions and step length, and solve the magnetic field model, stator and rotor circuit model and rotor motion model simultaneously , Namely the field-path-motion coupled time-step finite element model. If the three-phase control winding is directly short-circuited, the motor realizes self-starting and asynchronous operation, and the voltage at the right end of the control winding circuit model excites U sc Is zero.

[0075]...

Embodiment 2

[0077] Taking the power winding pole pair number p=4 and the control winding pole pair number q=1 as an example, the difference from Embodiment 1 is that Embodiment 2 is used to analyze series winding The harmonic content of the air gap flux density at the moment of asynchronous and stable operation of the type rotor brushless doubly-fed motor, such as Figure 4 Shown. It can be seen that the magnetic field not only contains 4 pairs of pole harmonics corresponding to the excitation windings, but also contains 1 pair of poles harmonics corresponding to the control windings, indicating that the series-wound type rotor has well realized the function of "pole number converter". The analysis result shows that the analysis method of the series-wound rotor brushless doubly-fed motor provided by the present invention can be used to analyze the temporal and spatial harmonic distribution characteristics of the motor.

Embodiment 3

[0079] Taking the power winding pole pair number p=4 and the control winding pole pair number q=1 as an example, the difference from Embodiment 1 is that Embodiment 3 is used to analyze series winding Type rotor brushless doubly-fed motor super synchronous operation performance. When the control winding is powered by the variable frequency power supply, the motor realizes double-fed speed regulation operation, and when the phase sequence of the two sets of stator winding power supplies is the same, the motor runs in super-synchronous speed regulation. During speed regulation operation, the voltage at the right end of the control winding circuit model excites U sc The amplitude of is determined by the variable frequency power supply, with the variable frequency power supply voltage amplitude of 100V, frequency f c Taking 20Hz as an example, the super-synchronous operating speed curve of the series-wound rotor brushless doubly-fed motor based on the field-path-motion coupling tim...

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Abstract

Disclosed is a series winding type brushless rotor doubly-fed generator analyzing method. The method includes the steps of A, establishing a two-dimensional magnetic field model of a series winding type brushless rotor doubly-fed generator; B, establishing a stator circuit model of the series winding type brushless rotor doubly-fed generator; C, establishing a rotor circuit model of the series winding type brushless rotor doubly-fed generator; D, establishing a mechanical motion model of the series winding type brushless rotor doubly-fed generator; E, establishing a field-circuit-motion coupling module time-stepping module of the series winding type brushless rotor doubly-fed generator and having the same solved according to the two-dimensional magnetic field model, the stator circuit module, the rotor circuit module and the mechanical motion model of the series winding type brushless rotor doubly-fed generator. With the method, influences of multiple nonlinear factors can be integrated, the operation state of an actual series winding type brushless rotor doubly-fed generator is got closer, and accuracy in dynamic analysis of the series winding type brushless rotor doubly-fed generator is improved.

Description

Technical field [0001] The present invention relates to the field of power system equipment analysis, in particular to power equipment analysis technology based on multi-physical quantity coupling. Background technique [0002] In the frequency conversion speed control system, currently the traditional cage induction motor is mainly used. For the safe and reliable operation of the entire speed control system, the capacity of the frequency converter used is larger than the rated capacity of the motor, and the cost of the frequency converter is generally several times higher than that of the same capacity motor . The brushless doubly-fed motor developed in the 1980s can achieve variable frequency speed control of high-power high-voltage motors with a smaller capacity inverter, which significantly reduces the cost of the entire speed control system. And since the brushless doubly-fed motor does not require a brush slip ring device, the stability and maintenance cost are greatly imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 卢伟甫赵海森刘石李冰段祺玮
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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