【作者】 王娟；

【导师】 李志军；

【作者基本信息】 河北工业大学 ， 控制科学与工程， 2018， 硕士

【摘要】 随着计算机控制技术以及电力电子技术的飞速发展,中性点经消弧线圈接地技术的研究进入了一个高速发展时期。单相接地故障选线、故障定位和隔离等取得了突破性进展,但基于消弧线圈本体技术的结构和控制方法近几年进展并不大。基于电力电子技术的晶闸管调感式消弧线圈(高短路阻抗调相消弧线圈)由于谐波污染较严重在业内仅昙花一现,迄今基于APF的全电流补偿消弧线圈技术仍不成熟,且成本高昂。传统调匝式消弧线圈因经济、可靠仍被广大用户所使用。本文从产品实用性能出发,并基于成熟的电力电子技术对现有的调匝式消弧线圈产品进行局部改造,设计完成了一套基于双向可控硅的随调调匝式消弧线圈新装置。本文首先对消弧线圈谐振接地原理进行了简单介绍,重点对传统调匝式消弧线圈工作原理和设计原则进行了讨论。在此基础上,提出了基于双向可控硅的随调调匝式消弧线圈技术方案,该技术方案采用双向可控硅替代原始有载开关,实现了“预调”向“随调”的升级。文中详细介绍了基于双向可控硅的随调调匝式消弧线圈的主拓扑电路工作原理和控制电路的具体技术实施方案。设计实现了7组双向可控硅控制的8挡随调调匝式消弧线圈,并完成了设备和器件选型设计工作。文中随后以实际装置型号XHDCZ-300/10.5/15-50调匝式消弧线圈参数为蓝本,搭建了随调调匝式消弧线圈的仿真模型,对该技术方案的调匝功能和随调特性进行了验证,并对双向可控硅工作电压和电流应力进行了仿真评估。仿真结果表明,该装置能满足消弧线圈调匝、随调功能,达到了预期的设计目标。文中最后针对双向可控硅快速切除所引发的暂态问题进行了讨论,建立了暂态回路数学模型,并对快速投切暂态过程进行了数学解析,对故障暂态和快速切除所引发的问题给出了解决方案。更多还原

【Abstract】 With the rapid development of computer control technology and power electronics technology,the research on earthing compensation technique of anti-arc coil has entered a period of rapid development.Although single-phase-to-ground fault,fault location and isolation make breakthrough progress,the structure and control methods based on arc suppression coil ontology technology have not been greatly advanced in recent years.The thyristor-adjuated arc suppression coil based on power electronics technology(high short-circuit impedance suppression coil)is only a flash in the industry because of the serious harmonic pollution.The technology of full current compensation arc suppression coil based on APF is still not mature so far,and costs high.The traditional multitap arc suppression coil is still used by the vast number of users because of its economy and reliability.In this paper,from the practical point of view of the product,existing multitap arc suppression coil product is partial reformed based on mature power electronics technology and a new following-setting mode-multitap arc suppression coil device is designed.Firstly,the principle of resonance grounding of arc suppression coil is briefly introduced.The working principle and design principle of the traditional multitap arc-suppression coil are discussed emphatically.On this basis,the technical scheme of following-setting mode-multitap arc suppression coil with bidirectional triode thyristor is proposed.The scheme adopts a bidirectional triode thyristor instead of the original load switch,realizing the upgrade from the "presetting" to "following-setting ".This paper introduces the working principle of the main topology circuit and the specific technical implementation of the control circuit with following-setting mode-multitap arc suppression coil in detail.In this paper,8 turns arc suppression coil controlled by 7 groups of bidirectional triode thyristor is designed and implemented,and the selection and design of equipment and devices are completed.Secondly,simulation model of following-setting mode-multitap arc suppression coil is built,which based on actual device type XHDCZ-300/10.5/15-50 arc suppression coil parameters.Then its turn regulation function and characteristics of following-setting are verified,the working voltage and current stress of bidirectional triode thyristor aresimulated and evaluated.The simulation results show that the device can meet the arc suppression coil turns and with the following-setting function,achieve the pre-design goals.Finally,this paper makes a discussion on the transient problem caused by rapid switch of bidirectional triode thyristor in the end and establishes a mathematical model of transient circuit,which gives a mathematical analysis of the transient process of fast switching.The solution to the problems caused by fault transient and fast switching is given.更多还原