高压直流输电线路故障暂态分析研究

发布时间：2018-03-08 19:50

本文选题：直流输电　切入点：高压直流输电　出处：《上海交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着大交流系统间区域互联的进一步发展,远距离大容量输电的需求逐渐增长。交流输电系统存在非同步稳定问题的缺陷,而采用电流源型换流器的高压直流输电技术是一种输送功率大、能够远距离实现系统互联的优秀输电方式,因此其受到了越来越多的关注。直流输电线路保护是高压直流输电工程控制保护系统的重要组成部分。为了进一步地提高直流线路保护可靠性和速动性等动作性能,需要对其故障暂态做更详尽地分析,并考虑直流故障、交流故障、雷击以及换相失败等因素对直流线路故障暂态的影响。本文研究紧紧地围绕高压直流输电线路的故障暂态特性分析,内容如下:(1)直流输电系统的模型研究。给出交流系统、换流站设备、控制系统、直流输电线路以及雷击的建模方法,从工程实用角度完善直流系统的电磁暂态模型。(2)探讨直流输电线路故障时的暂态特性。探索影响直流输电线路故障暂态特性的因素,研究雷击直流线路、交流系统故障两种故障情况下直流系统的电磁暂态特征,为继电保护运行提供技术支持。(3)探索直流输电线路在换相失败时的暂态特性。对换相失败进行详细的电磁暂态仿真,分析发生换相失败时高压直流输电线路的电磁暂态特性。最后对论文作了总结,指出进一步研究的方向。
[Abstract]:With the further development of regional interconnection among large AC systems, the demand for long distance and large capacity transmission is increasing gradually. The HVDC transmission technology with current source converter is an excellent transmission mode which can transmit large power and realize the interconnection of the system at a long distance. As a result, more and more attention has been paid to it. HVDC line protection is an important part of HVDC project control protection system. In order to further improve the operational performance of HVDC line protection, such as reliability and rapidity, etc. Need to do a more detailed analysis of its fault transient, and consider DC fault, AC fault, The effect of lightning stroke and commutation failure on the fault transient of HVDC transmission line is studied in this paper. The transient characteristics of HVDC transmission line are analyzed closely. The main contents are as follows: 1) the model of HVDC transmission system. The AC system is given. Modeling method of converter station equipment, control system, DC transmission line and lightning stroke, From the angle of engineering application, the electromagnetic transient model of DC system is improved. The transient characteristics of DC transmission line are discussed. The factors influencing the transient characteristics of DC transmission line are explored, and the lightning strike DC line is studied. The electromagnetic transient characteristics of DC system under two kinds of faults of AC system, which provide technical support for relay protection operation. (3) explore the transient characteristics of DC transmission line when commutation failure. The electromagnetic transient simulation of commutation failure is carried out in detail. The electromagnetic transient characteristics of HVDC transmission lines in the event of commutation failure are analyzed. Finally, the paper is summarized and the direction of further research is pointed out.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM75

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