高温超导涂层导体的交流损耗研究
发布时间：2019-05-22 09:21
【摘要】：超导电力技术是对电力行业非常重要的前沿技术之一,高温超导体具有体积小,载流能力强等特点,作为载流导体应用于大容量、低损耗输电有着广泛的前景。然而目前超导体必须应用在低温环境下,超导体的交流损耗的存在,不但会增加其制冷费用,还会降低超导电力设备的稳定性。所以,对高温超导涂层导体的交流损耗的研究有着十分重要的意义。本文首先详细叙述了高温超导涂层导体的交流损耗的研究背景与国内外的研究现状。从理论方面,对高温超涂层导体在自场、直流背景场和交流背景场下的损耗进行了详细的分析。叙述了其损耗产生的原因与种类,以及降低高温超导涂层导体的交流损耗的方法。在理论分析的基础上,列举了交流损耗的理论计算模型,如Norris模型。并对这些理论模型进行了计算,绘制了交流损耗的频率特性曲线。使用有限元仿真软件COMSOL对高温超导涂层导体的自场损耗进行了仿真。得到了高温超导涂层导体在传输交流电流时,其带材内的电流密度分布。进一步得到了自场交流损耗的仿真值。通过将仿真值与Norris公式的理论值进行对比,验证了仿真的可靠性与正确性。系统的阐述了高温超导涂层导体的交流损耗的测量方法。详细分析了三种测量方法的原理,对比各种测量方法的优劣与适用情况。在结合现有实验条件的基础上,搭建了自场、直流背景场和交流背景场下的交流损耗测量平台。分析了所搭建的平台的优点与不足,并对其误差进行了简单的分析。并且提出了对现有实验平台的改进方案。用自主搭建的实验平台,在液氮环境下(77K)测量了Bi系高温超导涂层导体与YBCO超导涂层导体的自场损耗和直流与交流背景场下的交流损耗。通过对实验数据的绘制与分析,发现其与理论模型吻合良好。分析了实验数据与理论数据存在偏差的原因。比较分析了两种超导体的交流损耗的异同并解释了具体原因。进一步得到了高温超导涂层导体交流损耗的特点及直流背景场与交流背景场对其的影响规律。
[Abstract]:Superconducting power technology is one of the most important frontier technologies for the power industry. High temperature superconductors have the characteristics of small volume and strong current carrying capacity. As current carrying conductors, they have a wide range of prospects for large capacity and low loss transmission. However, at present, superconductors must be applied to low temperature environment. The existence of AC loss of superconductors will not only increase the refrigeration cost, but also reduce the stability of superconducting power equipment. Therefore, it is of great significance to study the AC loss of HTS coated conductors. In this paper, the research background and research status of AC loss of HTS coated conductors are described in detail. Theoretically, the losses of high temperature supercoated conductors in self-field, DC background field and AC background field are analyzed in detail. The causes and types of loss are described, and the methods to reduce the AC loss of HTS coated conductors are also described. On the basis of theoretical analysis, the theoretical calculation model of AC loss, such as Norris model, is listed. These theoretical models are calculated and the frequency characteristic curves of AC loss are drawn. The self-field loss of HTS coated conductors is simulated by using the finite element simulation software COMSOL. The current density distribution in the strip of HTS coated conductor when transmitting AC current is obtained. Furthermore, the simulation value of self-field AC loss is obtained. By comparing the simulation value with the theoretical value of Norris formula, the reliability and correctness of the simulation are verified. The measurement method of AC loss of HTS coated conductors is systematically described. The principles of the three measurement methods are analyzed in detail, and the advantages and disadvantages of these methods are compared. On the basis of the existing experimental conditions, an AC loss measurement platform under self-field, DC background field and AC background field is built. The advantages and disadvantages of the platform are analyzed, and the error is simply analyzed. And the improvement scheme of the existing experimental platform is put forward. The self-field loss of Bi high temperature superconducting coating conductor and YBCO superconducting coating conductor and the AC loss in DC and AC background field were measured by using an experimental platform built by ourselves in liquid nitrogen environment (77K). Through the drawing and analysis of the experimental data, it is found that it is in good agreement with the theoretical model. The reasons for the deviation between the experimental data and the theoretical data are analyzed. The similarities and differences of AC loss between the two superconductors are compared and analyzed and the specific reasons are explained. The characteristics of AC loss of HTS coated conductors and the influence of DC background field and AC background field on it are further obtained.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM26
[Abstract]:Superconducting power technology is one of the most important frontier technologies for the power industry. High temperature superconductors have the characteristics of small volume and strong current carrying capacity. As current carrying conductors, they have a wide range of prospects for large capacity and low loss transmission. However, at present, superconductors must be applied to low temperature environment. The existence of AC loss of superconductors will not only increase the refrigeration cost, but also reduce the stability of superconducting power equipment. Therefore, it is of great significance to study the AC loss of HTS coated conductors. In this paper, the research background and research status of AC loss of HTS coated conductors are described in detail. Theoretically, the losses of high temperature supercoated conductors in self-field, DC background field and AC background field are analyzed in detail. The causes and types of loss are described, and the methods to reduce the AC loss of HTS coated conductors are also described. On the basis of theoretical analysis, the theoretical calculation model of AC loss, such as Norris model, is listed. These theoretical models are calculated and the frequency characteristic curves of AC loss are drawn. The self-field loss of HTS coated conductors is simulated by using the finite element simulation software COMSOL. The current density distribution in the strip of HTS coated conductor when transmitting AC current is obtained. Furthermore, the simulation value of self-field AC loss is obtained. By comparing the simulation value with the theoretical value of Norris formula, the reliability and correctness of the simulation are verified. The measurement method of AC loss of HTS coated conductors is systematically described. The principles of the three measurement methods are analyzed in detail, and the advantages and disadvantages of these methods are compared. On the basis of the existing experimental conditions, an AC loss measurement platform under self-field, DC background field and AC background field is built. The advantages and disadvantages of the platform are analyzed, and the error is simply analyzed. And the improvement scheme of the existing experimental platform is put forward. The self-field loss of Bi high temperature superconducting coating conductor and YBCO superconducting coating conductor and the AC loss in DC and AC background field were measured by using an experimental platform built by ourselves in liquid nitrogen environment (77K). Through the drawing and analysis of the experimental data, it is found that it is in good agreement with the theoretical model. The reasons for the deviation between the experimental data and the theoretical data are analyzed. The similarities and differences of AC loss between the two superconductors are compared and analyzed and the specific reasons are explained. The characteristics of AC loss of HTS coated conductors and the influence of DC background field and AC background field on it are further obtained.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM26
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4 金，
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