Large turbogenerator magnetic field characteristic analysis method based on element-free method

Abstract

The invention provides a large turbogenerator magnetic field characteristic analysis method based on an element-free method. The large turbogenerator magnetic field characteristic analysis method based on the element-free method includes the following steps: step one, a physical model is simplified; step two, a mathematical model is determined; step three, a region decomposition method and a radial basis non-element method are coupled, region division is performed according to electromagnetic characteristics of different regions, and the radial basis non-element method is used for solution to obtain the required coefficient of a radial basis function; and step four, result analysis is performed, the coefficient of a radial basis function is obtained through solution and is substitutes in the radial basis function, and results of required points are obtained finally and are magnetic field three-dimensional distribution and magnetic force line distribution. The large turbogenerator magnetic field characteristic analysis method based on the element-free method has the advantages of omitting complicated and fussy network partition and being simple in procedure achievement, accurate and rapid in calculation result. The region decomposition method is used, dimensionality of a final simultaneous big equation is reduced greatly, the large turbogenerator magnetic field characteristic analysis method is more suitable for parallel calculation, calculation results of a magnetic field can be used for subsequent electromagnetic force calculation and analysis of unbalancedness of electromagnetic force, and the large turbogenerator magnetic field characteristic analysis method based on the element-free method makes preparation for judgment of motor running fault.

Description

technical field [0001] The invention relates to the field of generator electromagnetic field calculation, in particular to a method for analyzing the magnetic field characteristics of a large turbogenerator based on a unitless method. Background technique [0002] The turn-to-turn short circuit of a large turbogenerator is a relatively common generator fault. In order to thoroughly understand the cause of the turn-to-turn short circuit, it is necessary to be able to calculate the corresponding magnetic field distribution, so as to provide a basis for subsequent fault diagnosis. Prepare. [0003] At present, most of the electromagnetic field analysis of motors is based on the finite element idea, but the finite element has a large dependence on the unit. When there is unit distortion, the finite element cannot solve the engineering electromagnetic field problems, such as thin sheet media, small air gaps and motion. Electromagnetic field problems in the presence of coils, etc...

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Problems solved by technology

[0003] At present, most of the electromagnetic field analysis of motors is based on the finite element idea, but the finite element has a large dependence on the unit. When there is unit distortion, the finite element cannot solve the engineering electromagnetic field problems, such as thin sheet media, small air gaps and motion. Electromagnetic field problems in the presence of coils, etc., which leads to the inability to obtain definite fault characteristics and obtain more accurate and effective fault criteria, which affects the effective analysis of the short circuit between turns of the excitation winding of the turbogenerator, and thus cannot analyze the fault in essence Causes

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