【作者】 王海青；

【导师】 杨建明；

【作者基本信息】 东南大学 ， 动力机械及工程， 2005， 硕士

【摘要】 汽轮机数字电液控制系统(DEH)建模与仿真是研究汽轮机控制品质、部件故障对系统的影响、故障诊断和技术培训等的有效技术手段。基于传统面向过程因果关系的建模方法,所得模型不具备单个部件的个性特征,没有明确的物理概念,可重用性和可维护性差,极大地限制了仿真技术在工程中的普及应用。因此,研究以部件和连接元件为中心、与实际系统相同连接关系为构架的新型建模方法,并开发人机界面友好、图示化、可维护的汽轮机数字电液控制系统仿真平台,具有重要的理论意义和工程应用价值。论文在全面分析现有汽轮机电液控制系统建模与仿真技术基础上,针对传统面向过程因果关系建模的不足,按真实系统由独立部件和连接元件组成的实际构架,提出了面向部件或元件物理对象、结构参数和特性参数为属性、无因果关系的建模思想,并基于MATLAB/SIMULINK图形化可视仿真平台开发了电液伺服阀、油动机、快速卸载阀、EH油泵、蓄能器等DEH系统的部件和元件模型库,方便地实现了电液控制系统仿真模型的构建,并通过改变部件型号或部件结构参数,十分灵活地仿真计算部件参数变化对系统动、静态特性的影响,以及单个或多个部件故障对系统整体性能影响的故障特征。基于汽轮机数字电液控制系统故障模式及影响分析,建立了DEH系统故障诊断知识库,采用Browser/Server架构,开发了Web方式的汽轮机电液控制系统故障诊断查询系统,实现了DEH系统故障分析知识的远程查询。更多还原

【Abstract】 It is efficient to research the control quality of steam Turbine、the fault diagnosis of DEH and carry out technological training for the modeling and simulating of Digital Electro-Hydraulic Control System(DEH)of steam Turbine in the thermal power plant。There is no character of single component and clear physical concept in the model for traditional Process-Oriented causal modeling-simulating method,the reuse and the maintainability of simulating model are difficult,so the engineering application of simulation technology is limited。It has important theory meaning and highly practical value of engineering to research new modeling-simulating method and develop simulating platform of DEH。In this thesis,a new kind of modeling-simulating method,Non-cause and effect、Physical Object-Oriented and modeling-simulating method was put forward,regarding to the shortage of traditional method,based on the complete analysis about modeling and simulating technology of DEH。Using the method,the thesis develops the simulating models library of DEH including the components of electro-hydraulic servovalve、oil servo motor、fast unloader valve、EH pump、accumulator and so on under the simulating platform MATLAB/SIMULINK,it is convenient to establish the simulating model of DEH for the library and easy to research the system and fault diagnosis of DEH for the simulating model。The dynamic fault diagnosis database was established based on the research for fault mode and fault influence of DEH,in addition,based on Browser/Server framework,the DEH dynamic fault diagnosis query system was developed,which could be used from long distance through internet。更多还原