【摘要】：在高壓直流輸電系統(tǒng)中,換流變壓器是重要設(shè)備之一,它的電、磁、熱、機械性能對電網(wǎng)的安全、可靠運行至關(guān)重要。由于換流變壓器運行時含有高次諧波電流,因此,其漏磁場及相關(guān)性能參數(shù)計算較普通變壓器的性能計算更加復(fù)雜,產(chǎn)生的可靠性問題也更加突出,而傳統(tǒng)的經(jīng)驗或解析方法已很難滿足設(shè)計性能要求,為此,本論文針對典型換流變壓器的結(jié)構(gòu)特點及設(shè)計性能分析,通過將實際復(fù)雜的三維非線性、非正弦瞬態(tài)渦流場計算問題進行合理簡化,并轉(zhuǎn)化為二維或三維等效計算問題,以提高計算效率及滿足產(chǎn)品性能要求。因此,對換流變壓器漏磁場以及短路阻抗、短路機械力等性能參數(shù)進行工程計算研究,有著非常重要的工程應(yīng)用價值和理論意義。本文進行的主要研究工作如下:(1)查閱和了解國內(nèi)外換流變壓器及電磁場的相關(guān)文獻資料,在此基礎(chǔ)上通過對典型換流變壓器的結(jié)構(gòu)特點進行分析并合理簡化,利用通用電磁軟件Mag Net建立了非正弦激勵的二維瞬態(tài)場計算模型,并且對漏磁場的分布進行了仿真分析以及短路阻抗的計算驗證;(2)從工程應(yīng)用出發(fā)進一步簡化等效為正弦穩(wěn)態(tài)場,利用數(shù)值計算與解析相結(jié)合的方法對換流變壓器漏磁場、短路機械力和附加損耗進行了數(shù)值計算與諧波影響的驗證分析,得到了指導(dǎo)產(chǎn)品的應(yīng)用結(jié)論和有效的工程計算方法;(3)利用國際基準(zhǔn)模型和三維有限元計算軟件,對比分析了表面阻抗法與分層法在計算導(dǎo)磁鋼板雜散損耗方面的性能特點,得出了用表面阻抗邊界法計算換流變壓器金屬結(jié)構(gòu)件三維雜散損耗,能有效地提高計算效率和滿足產(chǎn)品設(shè)計需要等的工程應(yīng)用結(jié)論。
[Abstract]:In HVDC transmission system, converter transformer is one of the most important equipments. Its electrical, magnetic, thermal and mechanical properties are very important to the safe and reliable operation of the power network. Because the converter transformer has high harmonic current in operation, the calculation of leakage magnetic field and related performance parameters is more complicated than that of ordinary transformer, and the reliability problem is more prominent. However, the traditional experience or analytical method has been difficult to meet the requirements of design performance. Therefore, according to the structural characteristics and design performance analysis of typical converter transformers, this paper analyzes the actual complexity of three-dimensional nonlinearity through the analysis of the structure characteristics and design performance of typical converter transformers. The calculation problem of non-sinusoidal transient eddy current field is reasonably simplified and transformed into two-dimensional or three-dimensional equivalent calculation problem in order to improve the calculation efficiency and meet the requirements of product performance. Therefore, the research on leakage magnetic field, short circuit impedance, short circuit mechanical force and other performance parameters of converter transformer has very important engineering application value and theoretical significance. The main research work carried out in this paper is as follows: (1) look up and understand the relevant literature of converter transformer and electromagnetic field at home and abroad, on this basis, through the analysis of the typical converter transformer structure characteristics and reasonable simplification, The two-dimensional transient field model of non-sinusoidal excitation is established by using the general electromagnetic software Mag Net, and the distribution of leakage magnetic field is simulated and verified by the calculation of short circuit impedance. (2) based on the engineering application, the equivalent sinusoidal steady state field is further simplified. The leakage magnetic field, short circuit mechanical force and additional loss of converter transformer are calculated by numerical calculation and analytical method, and the harmonic effect is verified and analyzed. The application conclusion and effective engineering calculation method of the guiding product are obtained. (3) by using the international benchmark model and three-dimensional finite element software, the performance characteristics of the surface impedance method and the layered method in calculating stray loss of magnetic conductive steel plate are compared and analyzed. It is concluded that the method of surface impedance boundary can be used to calculate the three-dimensional stray loss of the metal structure of converter transformer, which can effectively improve the calculation efficiency and meet the needs of product design.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM42

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