输电线路在线监测装置感应电源的研究与设计

发布时间：2018-12-11 15:07

【摘要】：随着科技与经济的快速进步和发展,智能电网的普及,输电线路的电压等级也在不断的提高。为了能够实时监视和测量线路的运行情况及线路的运行参数,越来越多的监测装置和电子设备安装在输电线路中,进而提高电力系统供电的稳定性。由于输电线路上的监测装置和电子设备常常处于强磁场、高电压的环境下,设计出稳定且可靠的供电电源是监测装置和电子设备稳定运行的保障。为解决给输电线路在线监测装置可长期运行且有足够功率的电源供电问题,讨论了一种直接安装在输电线路上的取能方案。在目前的供电电源中,感应取电电源是实际应用性较好的一种取能方式,论文主要针对感应取电电源中存在的磁饱和问题和供电死区问题进行了研究。首先,陈述了与感应取电电源相关的基本原理,讨论了取能电源与各参数间的关系,以及影响取能磁芯的磁饱和的因素。然后,为了解决取能磁芯易进入饱和状态的问题,本论文进行了相关理论分析和软件仿真,取能磁芯的材料选用了磁感应强度较高且经济的硅钢片。论文对取能磁芯的形状进行了设计,由两个C型磁芯构成。由于两个C型磁芯的接口处有一定间距的小气隙,会产生一定的气隙磁阻,由于气隙磁阻的存在,会避免取能磁芯过早的进入磁饱和状态。通过相关公式计算,确定取能线圈匝数。其次,当输电线路遭受雷击和通过大电流时,为了躲过取能线圈感应出较高的冲击性电流,在取能线圈后接入了抗冲击保护电路。同时,对取能电源的整流、滤波、稳压电路部分,也进行了功能对比和选择。本文为了使在线装置获得稳定的供电电压,把波动的直流电压变为稳定的直流电压,本文选用了LM2596AD 开关集成稳压器。最后,本文选用了Multisim软件对取能电源进行了整体的测试和仿真,本取能电源经过测试后,取能电源的输出电压基本符合预期的要求,验证了供电的稳定性。同时,也进行了实验室模拟平台的搭建。
[Abstract]:With the rapid progress and development of technology and economy, the popularization of smart grid, the voltage level of transmission line is also increasing. More and more monitoring devices and electronic devices are installed on transmission lines to improve the power supply stability in order to monitor and measure the line operation and line parameters in real time. Because the monitoring device and electronic equipment on the transmission line are often in strong magnetic field and high voltage environment, the design of a stable and reliable power supply is the guarantee of the stable operation of the monitoring device and electronic equipment. In order to solve the problem that the on-line monitoring device of transmission line can be operated for a long time and has sufficient power supply, a scheme of energy acquisition is discussed, which is directly installed on the transmission line. In the current power supply, the inductive power supply is a better practical energy acquisition method. This paper mainly focuses on the problem of magnetic saturation and dead time in the induction power supply. Firstly, the basic principles related to the inductive power supply are described, the relationship between the source and the parameters, and the factors affecting the magnetic saturation of the core are discussed. Then, in order to solve the problem that the core is easy to be saturated, this paper has carried on the related theoretical analysis and the software simulation, the material of the energy core has chosen the silicon steel sheet with high magnetic induction intensity and economy. In this paper, the shape of the energy core is designed, which is composed of two C type cores. Due to the small air gap at the interface of the two C-type cores, there will be a certain air-gap magnetoresistance. Because of the presence of the air-gap magnetic resistance, the energy core will avoid entering the magnetic saturation state prematurely. The number of turns of the energy-taking coil is determined by the calculation of the relevant formula. Secondly, when the transmission line is struck by lightning and passes through a large current, in order to avoid the higher impact current induced by the energy fetching coil, the anti-shock protection circuit is connected after the energy extraction coil. At the same time, the functions of rectifying, filtering and stabilizing circuit are compared and selected. In order to obtain a stable supply voltage and change the fluctuating DC voltage into a stable DC voltage, the LM2596AD switch integrated voltage regulator is selected in this paper. Finally, the Multisim software is used to test and simulate the power supply. After testing, the output voltage of the power source is basically in line with the expected requirements, and the stability of the power supply is verified. At the same time, the laboratory simulation platform is also built.
【学位授予单位】：沈阳农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75;TM724
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本文编号：2372764