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  本文選題：一階回轉曲線 + Preisach磁滯模型��； 參考：《華北電力大學》2017年碩士論文

【摘要】：鐵磁材料的磁特性主要包括磁化特性與損耗特性,相關的研究工作對于電力系統(tǒng)電氣設備的制造及運行具有十分重要的意義。鐵磁材料磁特性測量的方法和設備決定著實驗的準確性,依據(jù)可靠的實驗數(shù)據(jù)可以對相關仿真結果進行有效性驗證。磁滯模型作為研究鐵磁材料磁特性的核心問題,其計算效率、準確性和適用性需要在建模過程中予以綜合考慮。由于鐵磁材料的損耗特性,電氣設備會在運行時產(chǎn)生損耗,將損耗分離模型與有限元計算相結合,分析頻率、磁通密度對硅鋼片及變壓器鐵心損耗特性的影響規(guī)律,對于電工鋼片、變壓器制造及設計等具有重要的工程價值。在國家自然基金項目“基于材料性能工程模擬與定點諧波平衡法的電力變壓器直流偏磁數(shù)值仿真及有效性驗證”(51307057)的資助下,本文利用硅鋼片直流測試系統(tǒng),合理設計實驗方案,實現(xiàn)了鐵磁材料靜態(tài)磁滯回線、一階回轉和高階回轉曲線的測量。利用數(shù)值方法計算生成的一階回轉曲線數(shù)據(jù),用來對Everett函數(shù)進行參數(shù)辨識,進而得到了基于一階回轉曲線的以磁通密度B作為輸入的Preisach模型。將模型的仿真結果與實驗數(shù)據(jù)進行對比,驗證了該模型的準確性。最后介紹了定點諧波平衡有限元算法,實現(xiàn)了硅鋼片的損耗分離進行計算。將該損耗分離模型與定點諧波平衡有限元算法相結合,計算了硅鋼疊片內的一維非線性渦流場。
[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.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN253

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