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本科学士毕业设计（论文）I微机距离保护模块设计及计算机编程摘要随着电力系统的不断发展，高压输电得到了很大发展，继电保护装置也在不断地完善，新的方法和保护原理也在不断地被提出。传统保护显然已经不能再满足正日益复杂化的电力系统的要求。距离保护以其在高压线路上独特的保护性能优势，已经成为继电保护大家族中最重要的一员。如今，计算机技术的飞速发展，使得距离保护已经由原来的传统距离保护发展为微机距离保护。而微机距离保护模块化设计已经成为研究距离保护的重点所在。本文首先介绍了微机距离保护的发展历程，然后就其程序模块化进行分析，最后对于主要保护模块进行了流程图设计，并利用C语言对其进行了程序编制，通过simulink仿真，搭建简单电力系统故障模型，采集数据，验证了程序的准确性以及可靠性。本文重点在于分析能实现同一种原理的不同方法之间的异同，通过比较它们之间的优缺点，选择一种最实用的方法，缩短程序运行时间，从而改善微机距离保护的安全性与可靠性。关键词：微机距离保护；模块；程序编制；simulink仿真本科学士毕业设计（论文）IIMODULARDESIGNOFMICROPROCESSORDISTANCEPROTECTIONAbstractWiththecontinuousdevelopmentofpowersystem,high-voltagetransmissionhasagreetdevelopment.Relayprotectiondevicesalsohavebeenimproved.Newmethodsandprincipleoftheprotectionhasbeenproposed.Traditionalprotectionisobviouslynolongermeetingtheincreasinglycomplexpowersystemrequirements.Withitsuniqueperformanceadvantagesinthehigh-voltagecircuitregard,distanceprotectionhasbecomethemostimportantoneinthelargefamilyofrelayprotection.Today,dependingontherapiddevelopmentofcomputertechnology,thedistanceprotectionhasdevelopedintomicroprocessordistanceprotectionfromthetraditionalone.Andthestudyofmodulardesignofmicroprocessordistanceprotectionhasbecomethefocusofdistanceprotection.Atfirstthisarticleintroducesthecourseofdevelopmentofdistanceprotection,andthenanalysestheprinciplesofitsprotectionaswellasthefactorsthatimpactthenormalactionsofit.FinallywehavedesignedtheflowchartofthemainmoduleoftheprotectionandusedClanguagetoprogram.Throughsimulationwithsimulink,webuildasimplemodelofpowersystemfaultwhichcollectsdatatoverifytheaccuracyoftheprocedures,aswellasitsreliability.Thisarticlefocusesonanalyzingthesimilaritiesanddifferencesbetweendifferentmethodswhichcanachievethesameprinciple.Bycomparingtheadvantagesanddisadvantagesbetweenthem,weselectoneofthemostpracticalapproaches.Bythisapproachwecanshortentheruntime,thusimprovingthesecurityandreliabilityofthemicroprocessordistanceprotection.Keywords:microprocessordistanceprotection;modular;programmer;simulinksimulation本科学士毕业设计（论文）目录摘要............................................................................................................................................IAbstract..........................................................................................................................................II1绪论.............................................................................................................................................11.1问题的引出..............................................................................................................................11.2微机距离保护的发展历程及研究现状...................................................................................11.3本论文的主要工作..................................................................................................................22微机距离保护的功能模块及算法...........................................................................................32.1距离保护的基本原理..............................................................................................................32.2微机距离保护的模块构成.......................................................................................................32.2.1启动模块...............................................................................................................................32.2.2选相模块...............................................................................................................................42.2.3测量模块................................................................................................................................62.2.4振荡闭锁模块........................................................................................................................72.2.5PT断线模块...........................................................................................................................82.3微机距离保护的算法..............................................................................................................92.3.1傅里叶级数算法…..………………………………………………………………………102.3.2解微分方程算法…………………………………………………………………………...112.3.3两种算法的比较…………………………………………………………………………...122.3.4解微分方程算法的改进…………………………………………………………………...122.4本章小结……………………………………………………………………………………..133微机距离保护模块化程序设计...............................................................................................153.1引言........................................................................................................................................153.2各模块的程序设计................................................................................................................153.2.1启动元件程序模块………………………………………………………………………...153.2.2选相程序模块……………………………………………….……………..………..……..163.2.3阻抗计算程序模块……………...………………………….……………………………...173.2.4阻抗特性比较程序模块…..……………………………………….….………………..….183.3本保护所采用的算法………………………………………………………………………203.4本章小结…………………………………………………..…………………………………204基于Matlab/Simulink的仿真验证…………………………………………………….……..224.1引言…...................................................................................................................................