【作者】 吴翊；

【导师】 林莘；

【作者基本信息】 沈阳工业大学 ， 高压电器， 2002， 硕士

【摘要】 随着我国电网事业的迅速发展，用户对配电网的可靠性要求越来越高。馈线自动化是配网系统中提高供电可靠性最有效的技术手段，因此，馈线自动化技术及其在配电网中的应用也成为配电网自动化系统的热门话题。作为馈线自动化的核心设备——馈线终端(FTU)，也已成为各大厂商竞相研制的内容之一。 本文首先提出了馈线自动化专用设备馈线终端，并结合其运行情况，讲述了它的工作原理、实现的功能及所起到的作用，包括故障检测、故障隔离、非故障段自动恢复供电的功能实现。具体阐述了实现FTU监测等主要功能的相关技术理论及公式，包括交流采样中各电量计算并专门讨论了谐波测试和傅立叶分析，给出了实现的方案。 其次，本文介绍了FTU相关软、硬件的设计。按照功能的不同，硬件划分成处理器系统模块、模拟信号输入和转换模块、开关量输入输出模块、通信模块、时钟模块、键盘显示模块、电源模块。软件划分成自检模块、数据采集模块、数据处理模块、通信模块和键盘显示模块。钍对各个模块，本文给出了详细的阐述。该系统以两个16位处理器80C196KC为核心，利用MAX125采样器进行每周波64点的实时采样。同时根据采样值系统计算了频率、有效值、谐波、功率因数等电量，并通过RS-485通信口与二级子站微机相配合，达到智能控制的作用。软件按照各模块的程序设计给出了相应的程序设计流程图，并作了简要的分析。本文还介绍了配网自动化通信技术，结合馈线自动化对通信方式和通信规约的特殊要求，遵照101规约，阐述通信模块的实现。同时为防止外在干扰，本文详细地阐述了硬件中屏蔽、滤波、接地等的抗干扰措施的具体应用。 最后，本文在研制软硬件系统的基础上进行了初步测试，并给出了相关初步测试结果，通过分析测试中误差存在的原因，得出进一步减小误差的疗法：提高软件数据处理的精度、增加采样频率和选用精度更高的元器件等。在实验过程中本文还运用自编制的PC机通信测试程序进行了联机测试。 本文的研究工作证明：所研制的FTU在经济性和可靠性上可以满足馈线自动化的需要，特别适用于城网改造。更多还原

【Abstract】 With the fast development of electrical network, the requirement for the reliability of distribution net has been more and more high. The feeder automation (FA) is the most effective way to improve the reliability of distribution net so that it is the hot point of distribution network automation system (DA) at present. Thus, the Feeder Terminal Unit (FTU), as the core apparatus of the feeder automation, has been selected as the aim product by many manufacturers.First, in this thesis it presents automatic apparatus system, a new equipment of feeder automation, describes the functions of fault detection, fault isolation and automatic restoration of power supply in the non-broken-down sections, and discusses FTU action principles when fault occurs combining with actual running environment. The correlative techniques to achieve the monitoring function of FTU are discussed in details, including the calculation of the electric parameters in AC sampling. Also, the harmonic monitor and FFT are discussed specially.Secondly, this thesis describes its design of the hardware and software development. According to different function, the hardware part is divided into processor module, analog signals input and converting module, digital signals module, communication module, clock module and display module. The software part is divided into communication module, self-diagnosis module, data sampling module and data dispose module. The details on every module are provided. This system bases on two 16 bits microprocessor 80C196KC to sample 64 dots in a circle and deal with data in real time, using MAX125 as sampling apparatus. In such way, the frequency, the virtual value, the harmonic and power factor are acquired. It can achieve the intelligent control by way of cooperating with master station automatic apparatus system through adopting RS-485 communication standard. The software part presents the flow charts and brief introduction according to the program design. At the same time, linking with the special requests of DA in communication mode and agreement, this thesis introduces the communication technologies and explains the realization of the communication module conforming to IEC870-5-101. The anti-jamming techniques of shielding, filtering, grounding are applied in hardware part to prevent external disturbs as well.Finally, in the basis of development in hardware part and software part, this thesispresents the results of the primary tests and analyzes the causes of the existing errors. Also the approaches to reduce the errors are discussed, for example, improving the accuracy of the elements, raising he sampling frequency and so on. During the experiment, the online test between the PC and FTU is tried through the testing program in PC.In conclusion, it proves that the system can meet the requirement of reliability and price in FA, and be suitable for the improving of city distribution network.更多还原