柔性直流输电线路故障处理与保护技术评述

发布时间：2019-03-11 15:28

【摘要】：由于柔性直流输电系统调节方式和自身结构的特殊性,直流线路的故障电流具有上升速度快、峰值大的特点,极易损坏换流器件和设备绝缘,且柔性直流系统无法通过调节触发角实现故障自清除。因此,对直流线路故障处理和保护提出了更高要求。对于柔性直流线路故障,不仅需要快速且可靠的线路保护对故障进行识别,也需要相应的处理措施和手段对故障后的电流进行有效限制,以减少故障冲击电流对换流器件、直流线路自身以及系统的损害。基于柔性直流输电线路的故障特征,从直流线路故障电流抑制、减少故障影响、线路保护原理等方面,系统地介绍了国内、国外柔性直流输电线路故障处理与保护技术的现状和发展。重点分析了几种辅助电路、新型换流器拓扑和直流输电结构,以及直流断路器在处理直流线路故障方面的性能。探讨了目前柔性直流输电线路故障处理和保护亟须解决的关键问题以及未来进一步的研究方向。
[Abstract]:Due to the regulation mode of the flexible direct-current transmission system and the particularity of the self-structure, the fault current of the direct-current line has the characteristics of high rising speed and large peak value, and is easy to damage the insulation of the inverter device and the equipment, and the flexible direct-current system can not realize the self-cleaning of the fault by adjusting the trigger angle. Therefore, higher requirements for fault handling and protection of DC line are put forward. In the case of the fault of the flexible DC line, the fault is not only identified by the rapid and reliable line protection, but also the corresponding treatment measures and means are required to effectively limit the current after the fault, so as to reduce the damage of the fault impact current to the converter, the DC line itself and the system. Based on the fault characteristic of the flexible direct current transmission line, the present situation and development of the fault treatment and protection technology of the flexible direct current transmission line in China and abroad are introduced systematically from the aspects of the fault current suppression of the DC line, the reduction of the fault, the principle of line protection and so on. Several auxiliary circuits, new converter topology and DC power transmission structure, and the performance of DC circuit breaker in dealing with the fault of DC line are analyzed. The key problems and future research direction of the current flexible DC transmission line fault handling and protection are discussed.
【作者单位】：上海交通大学电子信息与电气工程学院;
【基金】：国家自然科学基金资助项目(51377104,51407115) 中国博士后科学基金资助项目(2014M560333)~~
【分类号】：TM721.1;TM773

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