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基于Preisach模型的磁特性模拟方法研究

发布时间:2018-04-25 14:37

  本文选题:一阶回转曲线 + Preisach磁滞模型 ; 参考:《华北电力大学》2017年硕士论文


【摘要】:铁磁材料的磁特性主要包括磁化特性与损耗特性,相关的研究工作对于电力系统电气设备的制造及运行具有十分重要的意义。铁磁材料磁特性测量的方法和设备决定着实验的准确性,依据可靠的实验数据可以对相关仿真结果进行有效性验证。磁滞模型作为研究铁磁材料磁特性的核心问题,其计算效率、准确性和适用性需要在建模过程中予以综合考虑。由于铁磁材料的损耗特性,电气设备会在运行时产生损耗,将损耗分离模型与有限元计算相结合,分析频率、磁通密度对硅钢片及变压器铁心损耗特性的影响规律,对于电工钢片、变压器制造及设计等具有重要的工程价值。在国家自然基金项目“基于材料性能工程模拟与定点谐波平衡法的电力变压器直流偏磁数值仿真及有效性验证”(51307057)的资助下,本文利用硅钢片直流测试系统,合理设计实验方案,实现了铁磁材料静态磁滞回线、一阶回转和高阶回转曲线的测量。利用数值方法计算生成的一阶回转曲线数据,用来对Everett函数进行参数辨识,进而得到了基于一阶回转曲线的以磁通密度B作为输入的Preisach模型。将模型的仿真结果与实验数据进行对比,验证了该模型的准确性。最后介绍了定点谐波平衡有限元算法,实现了硅钢片的损耗分离进行计算。将该损耗分离模型与定点谐波平衡有限元算法相结合,计算了硅钢叠片内的一维非线性涡流场。
[Abstract]:The magnetic properties of ferromagnetic materials mainly include magnetization characteristics and loss characteristics. The related research work is of great significance for the manufacture and operation of electrical equipment in power system. The accuracy of the experiment is determined by the method and equipment of measuring the magnetic properties of ferromagnetic materials. The validity of the relevant simulation results can be verified by the reliable experimental data. Hysteresis model is the core problem in the study of magnetic properties of ferromagnetic materials. Its computational efficiency, accuracy and applicability need to be considered comprehensively in the process of modeling. Due to the loss characteristics of ferromagnetic materials, the loss of electrical equipment will occur during operation. The loss separation model is combined with finite element calculation to analyze the influence of frequency and flux density on the loss characteristics of silicon steel sheet and transformer core. It has important engineering value for electrical steel sheet, transformer manufacture and design. Supported by the National Natural Fund project "numerical simulation and validation of DC bias of power transformer based on material performance engineering simulation and fixed-point harmonic balance method", this paper uses a direct current testing system for silicon steel sheet. The measurement of static hysteresis loop, first order gyration and high order gyration curve of ferromagnetic material is realized by reasonably designing the experimental scheme. The first order rotational curve data generated by numerical method is used to identify the parameters of Everett function, and a Preisach model with flux density B as input is obtained based on the first order rotation curve. The accuracy of the model is verified by comparing the simulation results with the experimental data. At last, the finite element algorithm of harmonic balance is introduced, and the loss of silicon steel sheet is calculated. The loss separation model is combined with the fixed-point harmonic balance finite element method to calculate the one-dimensional nonlinear eddy current field in silicon steel laminates.
【学位授予单位】:华北电力大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TN253

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