电气工程及其自动化专业本科毕业论文

-I-可控励磁发电系统综合性实验的设计摘要现代电力系统的发展，对同步发电机励磁控制提出了更高要求。发电机在正常工作情况下，负载总在不断地变化着。而不同容量的负载，以及负载的不同功率因数，对同步发电机励磁磁场的反映作用是不同的，要维持同步发电机端电压为一定水平，就必须根据负载的大小及负载的性质随时调节同步发电机的励磁。在各类电站中，励磁系统是保证同步发电机正常工作，提高电网稳定水平的关键设备。同步发电机励磁的自动控制在保证电能质量、无功功率的合理分配和提高电力系统运行的可靠性方面都起着十分重要的意义。本文主要对可控励磁发电系统进行了实验设计，首先对可控励磁发电系统做了相关简介并探讨了可控励磁发电系统的国内外未来发展形势。本文着重在可控励磁系统中的过励限制方面作了重点分析，并设计了相关的一个过励限制特性试验，对过励限制系统加深了了解。关键词电力系统；励磁控制系统；过励限制-II-IntegratedpowersystemexcitationcontroldesignofexperimentAbstractThedevelopmentofmodernpowersystem,synchronousgeneratorexcitationcontrolonahigherrequirement.Generatorsinnormalcircumstances,thetotalloadisconstantlychanging.Anddifferentloadcapacityandloadofdifferentpowerfactor,synchronousgeneratorexcitationfieldonthereflectionoftheroleisdifferent,tomaintainthesynchronousgeneratorterminalvoltagetoacertainlevel,itmustbebasedonloadsizeandthenatureoftheloadregulationatanytimesynchronizationpowergenerator.Invariouspowerplant,synchronousgeneratorexcitationsystemistoensurethatworktoimprovethelevelofpowerandstabilityofkeyequipment.Synchronousgeneratorexcitationcontrolinpowerqualityassurance,rationalallocationofreactivepowerandimprovereliabilityofpowersystemoperationsandplayanimportantrole.Thispapermainlycontrolledexperimentalexcitationpowersystemdesign,firstgenerationsystemasacontrollableexcitationprofileandtherelatedpowersystemexcitationcontrolofthefuturedevelopmentofthesituationathomeandabroad.Thisarticlefocusesonthecontrolledexcitationsystemoverexcitedrestrictionswereanalyzed,anddesign-relatedcharacteristicsofanoverexcitedlimittest,thesystemhadexcitinglimittodeepenunderstanding.Keywords：powersystem；excitationcontrolsystem；overexcitedlimit-III-目录摘要......................................................................................................................IAbstract.............................................................................................................Ⅱ第1章绪论........................................................................................................11.1发电机励磁控制系统简介.......................................................................11.2励磁控制系统的作用................................................................................21.2.1维持发电机端电压在给定水平.......................................................21.2.2提高电力系统的静态稳定性...........................................................21.2.3改善电力系统的暂态稳定性...........................................................41.2.4改善电力系统的动态稳定性...........................................................41.2.5在并列运行的发电机间合理分配无功功率...................................51.3自动励磁调节器的组成及功能...............................................................51.3.1基本工作电路...................................................................................51.3.2辅助工作电路...................................................................................51.4同步发电机励磁控制方式研究现状.......................................................61.4.1基于单变量控制方式.......................................................................61.4.2基于现代控制理论的多变量控制方式...........................................71.4.3非线性多变量励磁控制方式...........................................................81.4.4智能控制方法...................................................................................91.5国外研究及发展状况.............................................................................10第2章励磁系统的过励限制..........................................................................132.1过励限制的主要特性.............................................................................132.2限制过程.................................................................................................132.3级差..........................................................................................................142.4以励磁机磁场电流作为过励限制控制量的过励限制整定错误!未定义书签。2.5无发电机转子过负荷保护的处理.........................................................142.6过热量的释放和再次过励的条件.........................................................142.7过励保护..................................................................................................152.7.1顶值电流保护.................................................................................152.7.2过励反时限保护.............................................................................152.7.3过励报警信号.................................................................................15第3章可控励磁发电系统实验装置操作及维护..........................................163.1实验装置操作说明.................................................................................16-IV-3.2实验的基本要求.....................................................................................173.3可控励磁发电系统操作运行及检测维护..............................................183.3.1可控励磁自动调节系统的投入运行的操作步骤.........................183.3.2自动—手动控制切换操作要点.....................................................193.3.3可控励磁自动调节系统的正常运行要点.....................................193.3.4励磁调节装置的退出及停机操作要点.........................................203.3.5可控励磁自动调节装置的检查与维护.........................................213.4控励磁发电系统常见故障及处理方法..................................................223.4.1灭磁开关QFG的常见故