【作者】 刘晓放；

【导师】 熊小伏；

【作者基本信息】 重庆大学 ， 电气工程， 2009， 硕士

【摘要】 继电保护系统的隐藏故障是造成大规模停电事故的罪魁祸首之一。此类事故一旦发生必将引起电网的连锁反应,给电网带来灾难性的后果。随着互联系统网络容量的增大和电压等级的提高,继电保护隐藏故障也更将危及到电网的安全,因此对隐藏故障进行评估和分析对于保证电网的安全运行具有重要的理论和现实意义。而从技术潮流来看,防止继电保护系统隐藏故障的有效途径是建立隐藏故障的监视和控制系统。随着通信和计算机技术的发展,继电保护信息系统和广域测量系统的建设正在快速进行。这些信息的集成,为继电保护隐藏故障的诊断提供了可用的信息源。由于扩展了信息来源,继电保护的隐藏故障监视和控制变得可行。基于此,本文对继电保护系统隐藏故障进行了研究,具体完成了以下研究工作:(1)介绍了隐藏故障的相关知识,对继电保护系统的工作特性按静态特性和动态特性进行了划分。(2)讨论了继电保护静态特性隐藏故障监视的原理。将继电保护装置的测量计算值与参考值进行比较,若二者之差超过预先设定的门槛值,则认为继电保护装置的静态特性出现了隐藏故障。(3)讨论了继电保护隐藏故障诊断系统的结构。以WAMS和继电保护信息系统为基础,建立隐藏故障监视系统,以实现广域范围内的继电保护系统隐藏故障诊断。(4)采用基于距离的异常数据检测方法,建立了继电保护静态特性隐藏故障诊断的基本判据。以输电线路光纤差动保护为例,对判据门槛进行了详细分析。分析表明,该判据是有效和实用的。(5)阐述了基于多Agent系统的继电保护隐藏故障诊断系统的基本原理、结构和诊断过程,实例测试表明了该系统的有效性。更多还原

【Abstract】 Protection system hidden failures is one of the main causes of large-scale blackouts, which inevitably will lead to disastrous consequences of power grids from cascading failures. With the increment of interconnected system network capacity and enhancement of voltage level, power system security will be more and more endangered by protection system hidden failures so that it has important theoretical and realistic significance to evaluate and analyze hidden failures for ensuring safe operation of power grids. In terms of technologies trend, the effective way of preventing protection system hidden failures is to build monitoring and control system of hidden failures.With the development of communication and computer technology, the construction of relay protection information system and wide area measurement system is being implemented rapidly. The information integration provides available information sources for the diagnosis of protection system hidden failures, of which the monitoring and controlling becomes feasible due to the expanded information sources. Research on protection system hidden failures was studied in this paper and the following work has been finished:(1) Relevant knowledge on hidden failures is introduced and the operating characteristics of relay protection system is classified into static characteristics and dynamic characteristics.(2) The principle of monitoring hidden failures of static characteristics in relay protection system is discussed. Comparison between the surveying calculation value of protective devices and the reference value, it can be considered that hidden failures of protection static characteristics have arisen if the difference exceeds the preset threshold value.(3) The structure of protection system hidden failures diagnosis system is discussed. Based on relay protection information system and WAMS, hidden failures surveillance system is built to carry out the diagnosis of protection system hidden failures in large area.(4) Basic criterion for diagnosing hidden failures of static characteristics of power system is established by means of outlier examination method based on distance. The threshold value of the criterion is analyzed in detail taking the optical-fiber longitudinal differential protection of transmission lines for example. The analysis shows that the criterion is efficient and practical.(5) The basic principle, structure and diagnosis process of protection system hidden failures diagnosis system based on multi-agent system are represented. Systems’validity is proved by the example testing result.更多还原