磁耦合谐振式高温超导无线传能仿真与实验研究

发布时间：2018-01-16 19:42

本文关键词：磁耦合谐振式高温超导无线传能仿真与实验研究　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着无线电能传输技术新理论的提出和电力电子器件性能不断地提高,无线电能传输技术由于其较远距离的传输特征重新获得了许多研究团队的关注。同时其可以替代导线连接充电和受电弓滑动接触供电方式,避免直接接触产生的导线磨损、积碳和接触火花等问题,提高了供电的安全和可靠性。利用线圈间谐振的方式能够高效的传输能量和超导线圈的低损耗等特点,本文进行了关于系统的频率特性、负载特性、传输特性的研究及不同结构对于系统电气性能的影响的分析。首先,本文介绍了无线电能传输的三种类型及其基本工作原理,说明了超导材料在谐振式无线传能中的应用优势,推导了四种常见电路结构的接收端和发射端补偿电容值,得到了只有SS式电路结构其补偿电容值不受负载电阻值、互感系数及线圈参数的影响的结论。并介绍了耦合模理论及其分析方法,对比了 SS式结构分别基于电路分析和耦合模理论得到的传输效率,验证了该理论分析方法的可行性。针对本文所研究的阵列式无线传能系统,基于电路分析原理推导了系统传输效率的表达公式,分析了影响系统传输效率的参数关系,公式表明合适的负载电阻值和接收线圈位置能够提高系统的传输效率。其次,考虑到超导材料电导率的非线性,由E-J经验公式推导出其电阻率与电压的表达公式,并采用四引线法实验测试得到超导材料的重要参数一一临界电流密度,然后将公式的离散点数据写入材料库来定义超导线圈的特殊性质。在以矢量磁位A构建电磁场方程的有限元仿真软件中,优化了线圈模型,建立了三维的仿真模型,研究了静态下负载电阻、工作频率和发射线圈之间间距等参数分别与系统输出功率和传输效率的影响关系,仿真结果表明:合适的负载电阻值可使传输效率达到最大值;同时合理的发射线圈间距的结构对于负载功率的稳定性有一定的帮助。之后,在此仿真模型基础上通过动态仿真研究了引入速度变量对系统动态充电产生的影响,结果表明发射线圈紧密排列反而促进负载功率的稳定。最后,在上述理论研究和仿真分析的基础上,搭建了阵列式高温超导无线电能传输的实验平台,进行了相关的无线电能传输实验测试,完成了在不同电路参数(电源工作频率、占空比和负载电阻)和实验结构(发射线圈间的间距)下的数据采集,分析了电路参数与系统传输效率之间的关系及实验结构对于系统负载端电能接收稳定性的影响,实验验证了准静态测试过程中合适的发射线圈间距的结构能够使负载电阻的接收功率随接收线圈位置变化保持稳定的结论。
[Abstract]:With the development of the new theory of radio energy transmission and the improvement of power electronic device performance. Radio energy transmission technology has gained the attention of many research teams because of its long distance transmission characteristics. At the same time, it can replace wire connection charging and pantograph sliding contact power supply. The safety and reliability of power supply can be improved by avoiding wire wear, carbon deposition and contact spark caused by direct contact. The energy transmission and the low loss of superconducting coil can be efficiently transmitted by the way of resonance between coils. In this paper, the frequency characteristics, load characteristics, transmission characteristics of the system and the effects of different structures on the electrical performance of the system are analyzed. In this paper, three types of radio energy transmission and their basic working principles are introduced, and the advantages of superconducting materials in resonant wireless energy transmission are explained. The compensation capacitance values of the receiver and transmitter of four common circuit structures are deduced, and the compensation capacitance value of SS circuit structure is not affected by the load resistance value. The effect of mutual inductance and coil parameters on the transmission efficiency of the SS structure is compared by introducing the coupling mode theory and its analysis method. The results show that the SS structure is based on the circuit analysis and the coupled mode theory respectively. The feasibility of the theoretical analysis method is verified. Based on the circuit analysis principle, the expression formula of system transmission efficiency is derived for the array wireless energy transmission system studied in this paper. The relationship between the parameters affecting the transmission efficiency of the system is analyzed. The formula shows that the proper load resistance and the position of the receiving coil can improve the transmission efficiency of the system. Secondly, considering the nonlinearity of the conductivity of the superconducting material. The expressions of resistivity and voltage are derived from the E-J empirical formula, and the critical current density, which is an important parameter of superconducting material, is obtained by four-lead method. Then the discrete point data of the formula are written to the material library to define the special properties of the superconducting coil. The coil model is optimized in the finite element simulation software which uses vector magnetic potential A to construct the electromagnetic field equation. A three-dimensional simulation model is established to study the relationship between the parameters of load resistance, working frequency and the distance between transmitting coils and the output power and transmission efficiency of the system under static condition. The simulation results show that the maximum transmission efficiency can be achieved with the appropriate load resistance. At the same time, the reasonable structure of the transmitting coil spacing is helpful to the stability of the load power. On the basis of the simulation model, the influence of introducing velocity variables on the dynamic charging of the system is studied through dynamic simulation. The results show that the tight alignment of the transmitting coils promotes the stability of the load power. On the basis of the above theoretical research and simulation analysis, the experimental platform of array HTS radio energy transmission is built, and the related radio energy transmission experimental test is carried out. The data acquisition is completed under different circuit parameters (power supply frequency duty cycle and load resistance) and experimental structure (distance between transmitting coils). The relationship between the circuit parameters and the transmission efficiency of the system and the influence of the experimental structure on the stability of the power receiving system at the load end are analyzed. The experimental results show that the proper structure of the distance between the transmitting coils during the quasi-static test can keep the receiving power of the load resistor stable with the change of the position of the receiving coil.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM724

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