关于广域保护下通信系统的研究

【作者】 沙志成；

【导师】 赵建国；

【作者基本信息】 山东大学 ， 电力系统及其自动化， 2005， 硕士

【摘要】 随着全国电网互连步伐的加快,我国电网的规模日益扩大,运行方式越来越复杂,对电网的保护和稳定控制越来越重要。近年来,世界上发生的几次重大电力事故都凸现了目前电力系统存在着继电保护和安全自动装置之间不能很好配合的严重缺陷,人们进一步认识到应该从整体或区域电网的角度加强继电保护和自动控制,不仅要加强继电保护本身的可靠性,还要使继电保护和自动控制装置的动作相配合,加强对故障后不稳定系统的控制。20世纪未,基于现代通信技术上的广域保护系统一经提出便备受关注,它以全新的方式解决了大电网继电保护和安全自动装置之间的协调问题,是今后电力系统继电保护的发展方向。 为了使分布在系统各点的装置之间相互配合,快速协调动作,广域保护系统必须首先获得各点信息(包括各测量点电气量信息,各本地装置的动作信息,网络拓扑结构信息等),这是关系广域保护系统能否实现的基础环节。因此,研究广域保护系统的实时通信问题,提高数据传输的可靠性和实时性尤为必要。而上述问题的解决要依赖于当前电力系统通信技术的发展。 随着卫星技术、计算机技术和通信技术的发展,广域保护的实现有了一定的硬件基础。目前,10M和100M以太网已经得到广泛应用,更高带宽的网络如1G甚至10G也逐步进入实用化阶段。光纤在电力系统中广泛应用,以山东电网为例,220kV及以上电压等级的变电站之间均架设了SDH双环自愈合光纤网,部分地实现了SDH之上承载ATM的业务,在物理传输介质上已基本满足要求。这些新技术都为广域保护系统带来了通信技术上的革命,为广域保护的实现创造了机遇。 本文结合“基于‘三道防线’的广域保护系统研究”项目对广域保护系统的通信问题进行研究,探讨利用现有通信条件实现广域保护的最佳方案。论文首先概述了广域保护系统的构成及各组成部分目前的研究进展,简单介绍了电力通信的发展和现状,然后从广域保护对通信技术的要求出发,重点对影响最大的通信延时进行剖析,之后对目前通信手段,即物理媒介、通信模式等进行分析,探讨适用于广域保护系统的通更多还原

【Abstract】 With the increasingly enlargement of electric network scale and the fast development of interconnected network, power system protection and stability control are becoming more and more important. In recent years, several major accidents among the world reveal that there is a lack of cooperation between relaying protection system and automatic safety device. It is also realized that relaying protection and automatic control must be strengthened from the point of view of whole network or regional network. The reliability of relaying protection must be improved, further more it is necessary to control relaying protection and automatic control device coordinately to enhance stability after fault.Based on modern communication technology, wide area protection system (WAPS) has been paid much attention since it is proposed in the end of last century. It finds a new way to deal with coordination issue between relaying protection system and automatic safety device in large power system. It leads the development of relaying protection. In order to coordinate devices installed all over the power system, information from each point is needed, including electric measurements, actuating signals and network topological structure. WAPS analyzes the information to decide the optimal control strategy and execute it. Wide area real time communication is the key technique to realize wide area protection in power system. It requires most reliability and least time error in data transmission. Weather the problem can be well solved depends on the development of communication technology in power system.The development of satellite, computer and communication technology provide hardware base for realization of wide area protection. At present, 10M and 100M Ethernet have been widely used, and wider bandwidth network such as 1G and 10G are becoming applied. Optical fiber has been widely used in power system. Taking Shandong electric network as anexample, SDH dicyclic self-healing optical fiber network have been set up between substation of 220kV and higher voltage grade. ATM service based on SDH has implemented partly. All these new technologies have brought communication revolutionary for wide area protection, and create opportunity to realize it.Communication research is carried out associated with the project of "study of wide area protection system based ?n ’three lines of defense’", to work out the best scheme for WAPS using present communication techniques. At first the WAPS structure and the development of each part are summarized, and the actuality and development of communication technology in power system is introduced. Then study is emphasized on how to reduce communication delay in order to meet the need of WAPS. Then discuss the communication means, such as communication physical media layer, communication mode etc., to find the scheme which is applicable of WAPS. Finally, evaluate the selected scheme together with advantages and disadvantages of communication system are discussed according to characteristic of power system. Finally , program for communication application 0更多还原