数字化牵引变电所二次系统在线监测与故障诊断方案设计

发布时间：2018-10-14 15:32

【摘要】：随着我国高速铁路的快速发展,目前我国的高速铁路已逐步由建设期进入运营维护期,安全性和稳定性成为人们对高铁新的关注点。随着运行时间的增加,高铁牵引供电设备的性能将呈下降趋势。作为动车组运行的动力源泉,牵引供电系统的安全可靠影响着整个铁路系统的运行,其二次系统运行状态直接决定了整个铁路供电系统的安全性与稳定性。为进一步提高数字化牵引变电所的运行可靠性,所内二次设备的在线监测与故障诊断的研究对牵引供电系统的设计和改进方案意义重大。数字化牵引变电所是由智能化一次设备、网络化二次设备在IEC61850通信协议基础上分层构建,是能够实现智能电子设备间信息共享和互操作的智能变电所。本文主要对数字化牵引变电所二次系统在线监测与故障诊断方法进行了研究,主要有以下几个方面:首先介绍了数字化牵引变电所二次系统的架构以及自身特点,对网络报文分析仪装置进行了介绍,本文将基于网络报文分析仪提供的二次设备监测数据实现对整个二次系统的在线监测并将监测信息作为故障诊断的信息来源。然后,进行了系统设计的需求分析,根据二次系统实际的需求分析构建了二次系统在线监测与故障诊断系统的设计框架,将系统的功能和系统的信息源进行了说明。基于网络报文分析仪提供的二次设备监测数据,利用Delphi编程实现二次设备的图形化监测界面,完成对整个二次系统的在线监测。根据监测信息,通过对二次系统状态信息源和评价对象的分析,建立了数字化牵引变电所二次系统状态评价指标集和层次分析模型,进而利用模糊综合评价法建立了数字化牵引变电所二次系统在线状态评价方法,对二次系统实时工作状态做出正确评价,将二次系统评价结果作为理论依据制定二次系统状态检修方案。在二次系统故障诊断的方法方面,由于二次系统工作环境差、电磁干扰严重,在信息采集、传递及处理过程中存在很多的不确定因素,针对二次系统故障诊断中信息获取的不确定性,提出基于模糊Petri网的故障诊断方法。根据高速铁路牵引供电系统保护特点和模糊Petri网的构成及二次系统模糊Petri网故障诊断规则,用三层推理的形式为诊断单元中的每个元件建立模糊Petri网模型;利用某段实际线路进行了故障诊断分析,结果表明该诊断方法能够给出整个故障诊断推理过程,并以概率的形式给出各个元件可能发生故障的置信度,能得到正确的结果。最后介绍数字化牵引变电所二次系统在线监测与故障诊断软件。利用实例测试,证明了本软件能够对二次系统进行实时监测并对于故障能给出正确的诊断结果。
[Abstract]:With the rapid development of high-speed railway in our country, the high speed railway in our country has gradually entered the period of operation and maintenance from the period of construction, and safety and stability have become the new focus of attention to high-speed rail. With the increase of running time, the performance of high-speed traction power supply equipment will decrease. As the power source of EMU operation, the safety and reliability of traction power supply system affects the operation of the whole railway system. The operation state of the secondary system directly determines the safety and stability of the whole railway power supply system. In order to further improve the operational reliability of digital traction substation, the research on on-line monitoring and fault diagnosis of secondary equipment in the substation is of great significance to the design and improvement of traction power supply system. Digital traction substation is composed of intelligent primary equipment and network secondary equipment based on IEC61850 communication protocol. It is an intelligent substation which can realize information sharing and interoperation among intelligent electronic devices. In this paper, the on-line monitoring and fault diagnosis method of the secondary system of the digital traction substation is studied, which includes the following aspects: firstly, the structure and characteristics of the secondary system of the digital traction substation are introduced. This paper introduces the device of network message analyzer. This paper realizes the on-line monitoring of the whole secondary system based on the secondary equipment monitoring data provided by the network message analyzer and regards the monitoring information as the information source of fault diagnosis. Then, the requirement analysis of the system design is carried out. According to the actual requirement analysis of the secondary system, the design framework of the on-line monitoring and fault diagnosis system of the secondary system is constructed, and the functions of the system and the information source of the system are explained. Based on the secondary equipment monitoring data provided by the network packet analyzer, the graphical monitoring interface of the secondary equipment is realized by Delphi programming, and the on-line monitoring of the whole secondary system is completed. According to the monitoring information and the analysis of the secondary system state information source and the evaluation object, the index set and the analytic hierarchy process model for the secondary system state evaluation of the digital traction substation are established. Then, the on-line evaluation method of secondary system of digital traction substation is established by using fuzzy comprehensive evaluation method, and the real-time working state of secondary system is evaluated correctly. The evaluation results of secondary system are taken as the theoretical basis to formulate the condition maintenance scheme of secondary system. In the secondary system fault diagnosis method, due to the poor working environment of secondary system and serious electromagnetic interference, there are many uncertain factors in the process of information collection, transmission and processing. Aiming at the uncertainty of information acquisition in secondary system fault diagnosis, a fault diagnosis method based on fuzzy Petri net is proposed. According to the protection characteristics of traction power supply system of high-speed railway, the constitution of fuzzy Petri net and the fault diagnosis rule of fuzzy Petri net of secondary system, the fuzzy Petri net model is established for each component in the diagnosis unit by the form of three-layer reasoning. The fault diagnosis analysis is carried out by using a certain section of actual circuit. The results show that the method can give the whole process of fault diagnosis and the confidence degree of each component may occur in the form of probability, and the correct result can be obtained. Finally, the online monitoring and fault diagnosis software for the secondary system of digital traction substation is introduced. It is proved that the software can monitor the secondary system in real time and give the correct diagnosis result.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U224.3;U226

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