换流变压器漏磁场及性能参数的工程计算研究

发布时间：2019-04-16 08:49

【摘要】：在高压直流输电系统中,换流变压器是重要设备之一,它的电、磁、热、机械性能对电网的安全、可靠运行至关重要。由于换流变压器运行时含有高次谐波电流,因此,其漏磁场及相关性能参数计算较普通变压器的性能计算更加复杂,产生的可靠性问题也更加突出,而传统的经验或解析方法已很难满足设计性能要求,为此,本论文针对典型换流变压器的结构特点及设计性能分析,通过将实际复杂的三维非线性、非正弦瞬态涡流场计算问题进行合理简化,并转化为二维或三维等效计算问题,以提高计算效率及满足产品性能要求。因此,对换流变压器漏磁场以及短路阻抗、短路机械力等性能参数进行工程计算研究,有着非常重要的工程应用价值和理论意义。本文进行的主要研究工作如下:(1)查阅和了解国内外换流变压器及电磁场的相关文献资料,在此基础上通过对典型换流变压器的结构特点进行分析并合理简化,利用通用电磁软件Mag Net建立了非正弦激励的二维瞬态场计算模型,并且对漏磁场的分布进行了仿真分析以及短路阻抗的计算验证;(2)从工程应用出发进一步简化等效为正弦稳态场,利用数值计算与解析相结合的方法对换流变压器漏磁场、短路机械力和附加损耗进行了数值计算与谐波影响的验证分析,得到了指导产品的应用结论和有效的工程计算方法;(3)利用国际基准模型和三维有限元计算软件,对比分析了表面阻抗法与分层法在计算导磁钢板杂散损耗方面的性能特点,得出了用表面阻抗边界法计算换流变压器金属结构件三维杂散损耗,能有效地提高计算效率和满足产品设计需要等的工程应用结论。
[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.
【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】：TM42

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