复合海底电缆在线状态监测系统应用研究

发布时间：2018-04-03 05:37

本文选题：复合海底电缆　切入点：在线监测　出处：《华北电力大学》2015年硕士论文

【摘要】：近年来海洋采油平台数量不断增加,海底电缆数量随之增多。至2012年渤海区域拥有海底电缆78条,约447公里。随着油田开发及电站并网等工作的需要,将有更多的海底电缆投入应用。采油平台通过海缆并网以后,海底电缆的稳定运行不仅关系到井口平台的生产,同时关系到整个电网的可靠运行。由于海底电缆的特殊运行环境,无法进行常规巡检,缺乏有效的安全管理措施。一旦突发事故,损失巨大。所以对日益增加的海底电力电缆进行在线状态监测对保证采油平台的正常运转具有重要意义。生产海缆时,厂家至少保留了20%以上的冗余光纤,可以利用复合海缆中冗余的光纤,采用光纤布里渊散射原理实施分布式监测海缆的温度及应力变化。这种利用复合海缆中的光纤,不改变现有的海缆结构,无需增加传感器,实现在线连续实时监测,可以预先发现海缆的故障隐患和故障趋势,防止事故突发所带来的被动影响。本文首先提出了复合海底电缆在线状态监测系统的总体方案,介绍了系统硬件设备的参数性能,并提出了上位机软件的设计要求和思路。详细阐述了布里渊散射应用于海缆温度监测、形变监测的理论基础。并利用有限元理论在ANSYS环境中建立了海缆温度场、应力场模型,对系统各相参数、阈值进行了仿真计算。并在模拟运行环境中开展实验,对参数进行了修正。在此基础上,本文设计了系统上位机软件的总体方案,并进行开发实现。系统软件在Lab Windows/CVI下开发完成,实现了数据采集、处理、存储和显示等功能。在数据采集和处理中利用基于线程池的多线程技术和基于线程安全队列及线程锁的数据保护机制,提高程序响应速度,满足系统实时性要求。在通信模块中自定义数据传输格式并采用Modbus TCP通信协议,确保数据传输的可靠性,有效解决了数据传输问题。借助数据库技术,设计了光纤温度数据到电缆导体温度映射的快速查询方法。对海缆安全状态分析算法进行了研究与实现,解决了系统数据存储方式、历史查询等关键问题。目前此系统在绥中36-1APP至旅大5-2平台海缆上投入运行并获得连续监测数据,本文对监测系统实测数据进行分析,验证了本项目的可行性。
[Abstract]:In recent years, the number of offshore oil production platforms has been increasing, and the number of submarine cables has increased.By 2012, the Bohai Sea region has 78 submarine cables, about 447 km.With the need of oilfield development and grid connection, more submarine cables will be applied.The stable operation of submarine cable is not only related to the production of wellhead platform, but also to the reliable operation of the whole power network.Due to the special operating environment of submarine cables, it is impossible to carry out routine inspection and lack of effective safety management measures.In the event of an accident, the losses are enormous.Therefore, it is very important to monitor the online status of the submarine power cable to ensure the normal operation of the oil recovery platform.In the production of submarine cable, the manufacturer retains at least 20% of the redundant optical fiber, which can be used to monitor the temperature and stress of the submarine cable by using the principle of Brillouin scattering and the principle of Brillouin scattering.By using the optical fiber in the composite submarine cable, without changing the existing cable structure and without adding sensors, the on-line continuous real-time monitoring can be realized, and the hidden trouble and the fault trend of the submarine cable can be detected in advance, and the passive influence brought by the sudden accident can be prevented.In this paper, the overall scheme of the compound submarine cable on-line state monitoring system is put forward, the parameter performance of the system hardware equipment is introduced, and the design requirements and ideas of the upper computer software are put forward.The theoretical basis of Brillouin scattering applied to temperature monitoring and deformation monitoring of submarine cable is described in detail.Based on the finite element theory, the temperature field and stress field model of submarine cable are established in ANSYS environment, and the system parameters and threshold are simulated.Experiments were carried out in the simulated operating environment, and the parameters were modified.On this basis, this paper designs the overall scheme of the system host computer software, and carries on the development realization.The system software is developed under Lab Windows/CVI, and the functions of data acquisition, processing, storage and display are realized.In data acquisition and processing, the multi-thread technology based on thread pool and the data protection mechanism based on thread safety queue and thread lock are used to improve the program response speed and meet the real-time requirements of the system.In the communication module, the data transmission format is defined and the Modbus TCP protocol is adopted to ensure the reliability of the data transmission, and the problem of data transmission is effectively solved.With the help of database technology, a fast query method from optical fiber temperature data to cable conductor temperature mapping is designed.The security state analysis algorithm of submarine cable is studied and implemented, and the key problems such as system data storage method, history query and so on are solved.At present, the system is put into operation on the submarine cable of Suizhong 36-1APP to Lunda 5-2 platform and continuous monitoring data are obtained. This paper analyzes the measured data of the monitoring system and verifies the feasibility of the project.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P756.1;P715.5

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