在线监测设备电源系统设计研究
2019-09-10詹金特卢文华
詹金特 卢文华



【摘 要】在线监测设备对电力系统的正常运行具有监测作用,其长期可靠运行具有重要意义,所以保证在线监测设备供电电源能够长期有效的供电具有重要意义。本文将考虑在线监测设备的负载特性及锂电池和超级电容的充放电特性,对在线监测设备的工作状态进行分析,得到在线监测设备随时间变化的电流需求,在保证电池使用寿命的条件下,通过电池管理系统的智能选择,切换使用锂电池和超级电容来进行供电,以确保锂电池能够长期安全可靠供电,实现在线监测设备的长期有效运行。
【关键词】在线监测设备;供电电源;锂电池;超级电容;智能选择
Abstract:The on-line monitoring equipment has the function of monitoring the normal operation of the power system,and its long-term and reliable operation is of great significance.So it is of great significance to ensure the long-term and effective power supply of the power supply of the on-line monitoring equipment.In this paper,the load characteristics of the on-line monitoring equipment and the charge discharge characteristics of the lithium battery and the super capacitor will be considered,and the working state of the onsline monitoring equipment will be analyzed,and the current demand of the on-line monitoring equipment changes with time is obtained.When the battery life is guaranteed,the lithium battery and the super capacitor are used to supply power through the intelligent selection of the battery management system to ensure the long-term safe and reliable power supply of the lithium battery and the long-term and effective operation of the on-line monitoring equipment.
This work is supported by State Grid Shanxi Electric Power Company of science and technology projects(No.SGSX0408)
Key words:Online monitoring equipment,Power supply,Lithium battery,Ultra capacitor,Intelligent selection
引言
随着电网智能化的普及,输配电线路的运行状态直接关系到整个電网运行的安全和效益[1],对输配电线路的监测越来越智能化,在线监测设备是其重要组成部分,受到了越来越多的关注。保证在线监测设备能长期正常运行具有重要意义。
目前,在线监测设备的供能方式主要有传统的锂电池供能、太阳能供能、分压电容取能、激光供能等方式以及CT 取能,相较与前三者,CT 取能应用更广泛[2-3],成为国内学者的研究热点。
在采用CT进行取能时,当线路电流较小时,无法感应出足够的电压,将会存在电源死区,由于电流互感器的磁饱和问题,单一材质的取能磁芯工作电流范围有限,当线路断电时无法得到稳定电流,使电源无法工作。考虑感应电流的大小,同时兼顾小电流、大电流时的取能工作,采用两个不同材质的取能磁芯并行工作,根据电流范围选择合适的磁芯取能。……
