【作者】 陈浩；

【导师】 李开成；

【作者基本信息】 华中科技大学 ， 电气工程， 2021， 硕士

【摘要】 电流是电力系统的重要参数,必须进行精准、实时地测量。除了正弦交流稳态电流之外,电力系统还存在二次设备、保护和控制装置,存在大量的直流电流测量问题。本文以TMR元件作为电流检测元件,设计了交直流均可测量的高精度新型电流传感器。采用具有中远距离电能传输能力的磁耦合谐振式无线电能传输技术作为电流传感器的供电方式,解决电流传感器的供能问题,丰富了电流传感器的供电方式。本文分析了多TMR芯片阵列式电流传感器在存在外界电流干扰时对测量误差的影响,提出了基于Newton-Cotes公式的数值积分算法,提高了电流测量的抗干扰能力。搭建了存在电流干扰下的复杂环境仿真模型,研究了当传感器数量发生变化、母线间距改变和母线偏心时多种数值积分算法性能。仿真结果表明,多种数值积分算法相比于常规的平均值法均能取得更佳的测量结果。文章设计了由四个TMR芯片构成的TMR电流传感器,实验结果表明使用数值积分算法的TMR电流传感器对正弦稳态交流电流和直流电流均有很高的测量精度。本文还研究了磁耦合谐振式无线电能传输系统的结构和特性,对无线电能传输系统进行建模,分析了系统输出功率和传输效率与电路参数之间的关系,并介绍了传输系统的频率分裂现象和解决方法。仿真分析了线圈间距、系统工作频率和负载阻值对系统传输性能的影响。本文还设计了两线圈磁耦合谐振式无线电能传输系统,测试结果表明所设计的两线圈磁耦合谐振式无线电能传输系统能在一定距离内为TMR电流传感器提供足够的功率。更多还原

【Abstract】 As one of the most important characteristic parameters in power system,current is closely related to power generation capacity and line transmission parameters.In order to ensure power quality,it is necessary to monitor the current in substation accurately and in real time.In the power system,besides the sinusoidal AC steady state current measurement,there is also the DC current measurement problem of the working current of the secondary equipment,protection and control devices.Based on TMR(Tunneling Magnetoresistance Effects,With superior performance,low price of TMR components as current detecting element,With cosco distance power transmission ability of the magnetic coupling resonant radio transmission technology as the power supply way of current sensor,design of a high-precision,ac/dc new current sensor,solve the problem of current sensor in high side power supply in transformer substation,enrich the current sensor mode of power supply.In this paper,the influence factors of measurement error are analyzed when the interference current exists outside the current sensor of multi-TMR chip array,and a solution based on numerical integration algorithm is proposed.Built a current under the interference of complex environment,a simulation model to study the multiple numerical integral algorithm and the distance change in bus,and change in the number of sensors bus eccentric,the performance of the situation when a variety of numerical integral algorithm are compared With the conventional average method has achieved a better simulation results,and designed a composed of four TMR chip TMR current sensor,the experimental results show that using numerical integration algorithm of TMR current sensor for sinusoidal alternating current and direct current has a high accuracy of measurement.This paper also studies the structure and characteristics of the magnetic coupling resonant radio energy transmission system,modeling the radio energy transmission system using the circuit theory,analyzes the relationship between the output power and transmission efficiency of the system and the circuit parameters,and introduces the phenomenon of frequency splitting in the transmission system and the solutions.Based on the circuit simulation software,the influences of coil spacing,system operating frequency and load resistance on the transmission performance of the system are simulated and analyzed.In this paper,a two-coil magnetic coupling resonant radio energy transmission system is designed.The test results show that the designed two-coil magnetic coupling resonant radio energy transmission system can provide enough power for the TMR current sensor Within a certain distance.更多还原