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题名	高温超导变压器中电磁问题的研究; 高温超导变压器中电磁问题的研究
作者	1陈敏,电工研究所
学位类别	博士
答辩日期	2004
授予单位	中国科学院电工研究所
导师	1余运佳,电工研究所
关键词	高温超导变压器 优化设计 漏磁分析 能量损耗 应力分析 High-temperature superconducting(HTS) transformer optimization design leakage magnetic field analysis AC losses stress analysis
其他题名	高温超导变压器中电磁问题的研究
学位专业	电工理论与新技术
中文摘要	高温超导变压器是高温超导技术在电力系统中的重要应用领域之一。本文根据高温超导带材的电磁特性，采用有限元方法对高温超导变压器中的电磁问题进行了系统的研究和分析，包括铁心运行温度、高温超导带材高电流密度对变压器性能的影响，高温超导绕组交流损耗的分析等，可为高温超导变压器的研制提供一定的理论依据。本文在材料测试的基础上进行了高温超导变压器的初步设计，并根据设计的初步结果，深入研究了高温超导变压器中的电磁问题。分别采用解析法、二维有限元法和三维有限元法计算了高温超导变压器绕组中的漏磁场分布，根据对比分析确定了适合于变压器漏磁场分析的二维剖面，并研究了工作温度、铁心材料、铁心结构、线圈类型以及线圈端部导磁环的材料、尺寸和位置对变压器性能的影响，优化了高温超导变压器的结构型式，确定了并联高温超导绕组间的电流分配原则。由于高温超导带材的低阻抗特性，不均匀换位方式也会引起很大的环流，因此本文研究了不同的换位方式对并联绕组间环流的影响。由于高温超导变压器的能量损耗为了研究高温超导变压器的经济性和可靠性，本文分别在正常运行状态下与短路故障状态下对高温超导变压器的铁心损耗、绕组交流损耗、线圈所受电动力和绕组承受的应力进行了分析。为了兼顾正常运行状态下超导绕组的载流能力、短路损耗和短路电动力的要求，本文选择了同心放置的双饼式线圈结构，并根据不同的优化目标，采用全局优化方法对采用该结构的高温超导变压器的结构参数进行了优化，其中包括导磁环的结构参数。本文还验证了三相高温超导变压器的电流分布与漏磁问题可以简化成单相变压器的模型来进行分析，并进一步探讨了大容量三相／单相高温超导变压器设计中存在的问题。 The high-temperature superconducting(HTS) transformer is one of the most promising superconducting applications in power systems. In this paper, according to the electromagnetic characteristics of HTS tapes, we adopted the finite element model to conduct the systemic study on electromagnetics of high-temperature superconducting transformers, especially on the electromagnetic analyses different from the conventional ones, for instance, the transformer performance influenced by the thickness of the low temperature Dewar, the high current density of HTS tapes, the AC loss analysis of HTS windings, and so on. The research may provide some useful theory basis for the development of HTS transformers. Firstly, the preliminary design of HTS transformers was completed based on the material experiments in this thesis. According to the preliminary design results, electromagnetic properties of HTS transformer were studied in detail. The analytic solution, two-dimensional finite element method(FEM), and three-dimensional FEM were applied to calculate the stray field distributions in HTS transformer windings considering the electromagnetic properties of the high-temperature superconductor, respectively. According to the analyzed results, the two-dimensional plane suitable to the stray field analysis was determined. The effects of the ferrite core material, the operating temperature, the core structure, the coil type, as well as the material, size, and position of the flux diverters at the end edge of the coils, on the transformer performance were studied, in order to choose the most suitable structure pattern to HTS transformer. The current distribution principle among parallel superconducting tapes or coils was determined, and the influence of the standard transposition on the circulation among stacked tapes was studied. Due to the low impedance characteristics of the tapes, incomplete transposition can not avoid the circumfluence effectively, the complete transposition is necessary to stack tapes. Then the core losses, the AC losses of HTS windings, especially of the parallel superconducting tapes or coils, the electromotive forces carried by HTS windings, and the stresses recieved by HTS tapes were analyzed when a HTS transformer was operating with the rated load and when it was short-circuited, respectively. Considering the loading capability, the short-circuited losses, and the short-circuited stresses of the superconducting tapes, the double pancake coils placed concentrically were adopted. The global optimization to constructural variables of the HTS transformer was done according to the different optimal goals in this thesis. The constructure variables of the flux diverters were optimized to improve the performance of the end edges of HTS coils. At last, this thesis confirmed that the analysis of the current distribution and the leakage magnetic field distribution of a 3-phase HTS transformer can be simlified to that of a single-phase transformer. A further research on the design of large-capacity 3-phase/single-phase HTS transformer was carried through.
语种	中文
公开日期	2010-10-18
页码	106
内容类型	学位论文
源URL	[http://ir.iee.ac.cn/handle/311042/6852]
专题	电工研究所_其他部门_其他部门_博士学位论文
推荐引用方式 GB/T 7714	1陈敏,电工研究所. 高温超导变压器中电磁问题的研究, 高温超导变压器中电磁问题的研究[D]. 中国科学院电工研究所. 2004.

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