企业配电网铁磁谐振故障诊断专家系统研制.pdf

I 南昌大学硕士学位论文摘要本论文是针对德兴铜矿动力厂35kV系统的铁磁谐振故障诊断问题进行研究的。由于该厂电网结构复杂,诱发铁磁谐振故障的因素很多,所以一直未有有效的解决措施。本文对铁磁谐振故障发生的原因进行了理论分析,并采用专家系统的方法对实际运行中发生的铁磁谐振故障进行诊断,提出了防止及消除这些故障的措施。论文分析了铁磁谐振故障的特点以及产生铁磁谐振故障的条件,在此基础上分析了PT饱和铁磁谐振故障诊断的因果关系,创建了一种树状知识模型,并针对故障现象的不确定性采用模糊产生式知识表示方法;根据系统特点,诊断推理模块选择采用带有启发信息的正向推理的推理控制策略;应用关系数据库技术建立了本系统的数据库,并巧妙地解决数据库接口问题,实现了该专家系统的可移植性,同时在实现组态王向用户数据库系统传输大量数据的编程中,巧妙地解决了原编程效率低的问题;最后,在Windows 2000Server、Visual C++和Microsoft SQL Server2000的平台下应用面向对象的程序设计方法进行了编程实现。关键词:故障诊断专家系统铁磁谐振关系数据库面向对象 l 南昌大学硕二L学位论文 Abstract Inthispaper,the ferroresonance in35kV work ofDeXing Copper Mine power factory work structure plicated andthere are many factorsresultinferroresonance,the effectivemeasures have notbeen found. Inthispaper,the factors result inferroresonance are discussed through theory analysis,ferroresonances that took place during the operational process are diagnosised through expert system,the measures ofpreventing andeliminating the ferroreonance are put forword. In thispaper,the charactistic offerroresonance and the factors result in ferroresonance are onthat,thecausality ofPT saturation resultin ferroresonance isdiscussed and arborescent kalowledge model system adopt away ofknowledge expression based on fuzzy creation way ofrule because oftheuncertainty offaultphenomenon,adopt positive inference control policy ininference module,apply thetechnology ofthe ER database toestablish the database andsolve theproblem ofthe interfacebetween thesystem andthedatabase torealizethereplanting ofthesystem. Intheprogramming course of alarge number ofdatatransmission between Kingview and user database system,the problem that lowefficiency ofprogram was last,thesystem apply theobj technology torealizethesystem module based on bined withWindows 2000Server、Visual C++和Microsoft SQL Server2000. Keyword:fault diagnosis,expert system,ferroresonance, database, object—oriented 独创性声明 Y928595 本人声明所呈交的学位论文是本人在导师指导下进行的研究工作及取得的研究成果。