【作者】 李音；

【导师】 高伟；

【作者基本信息】 华中科技大学 ， 热能工程， 2007， 硕士

【摘要】 当前火电机组容量越来越大,结构越来越复杂,参数越来越多,自动化程度越来越高。为了保证电力系统安全运行和使电能质量符合指标,国内外300MW及以上的大型机组无一例外地采用数字电液调节系统(DEH)取代了原有的机械液压调节系统。DEH系统可通过PID控制、逻辑控制等各种不同的控制规律和不同的系统组态,实现对汽轮机的转速控制、负荷控制、同步并网等功能。这使得该系统在控制能力、控制效果和系统的适应性、灵活性上得到了根本改变,大大提高了汽轮发电机组的自动化水平。DEH系统已成为单元机组乃至整个电厂控制的重要组成部分。因此,对DEH系统动态特性的研究就显得很重要了。本文以中间再热式汽轮机机组为对象,采用基于Matlab/Simulink进行后台仿真和Delphi语言实现前台界面开发的混合编程方式,通过Matlab语言和Delphi语言的成功连接与应用,开发了一种组态灵活、计算精确、界面友好、使用便利的汽轮机DEH系统建模与仿真平台,为研究大型汽轮发电机组DEH系统的动态特性建立了必备的仿真实验和理论验证条件。本文依据模块化建模的思想,在Simulink中分别建立DEH系统各组成部分的模型,并进行封装,且所有模型的信息保存在数据库中,以实现模型库的可修改。本项研究中通过Matlab编程,实现了遗传算法(GA)在模型参数辨识中的应用,从而提高了参数辨识的实效。平台界面的开发在Delphi中完成,实现了对Matlab/Simulink的后台调用。所开发的平台集成了系统建模、系统仿真、参数辨识、数据库管理和命令窗口等多个功能。本文利用嵩屿电厂4#机组调速系统(DEH系统)试验的数据,在本平台上进行了模型建立、参数辨识和动态仿真研究。其研究结果表明,该平台仿真与经典调速系统模型仿真的结果很接近,模型精度可以满足要求,验证了本平台的可用性。本文解决了Delphi与Matlab之间进行数据通讯的技术难题,为不同计算机语言的综合、合理应用开辟了一条新途径。同时建立了DEH系统建模与仿真的组态平台,为研究DEH的动态特性提供了一个良好的环境。更多还原

【Abstract】 Currently, new power plants are manufactured with greater capacity, more complicated structure, higher automation degree. For ensuring electric power system’s safe operation and making power quality accorded with index, power plants with 300MW capacity and above all use digital electro-hydraulic control(DEH) system replace of original mechanical hydraulic control system at home and abroad. Now DEH system achieves rotate speed control, load control and synchronization of steam turbine by different control regulation and different system configuration such as PID control, logic control and so on. So the control ability, control effect, adaptability and flexibility of the system has been changed fundamentally, and the automation level of turbo-generator unit has been improved greatly. DEH system has already become an important component of unit load system and even entire power plant controls. So it’s important to research the dynamic characteristics of DEH.This thesis builds a DEH modeling and simulation configuration platform of reheat-type unit. The platform adopts combined programming of Delphi and Matlab, uses Matlab/Simulink for configuration and calculating, and uses Delphi for interface. Then it achieves the development of DEH modeling and simulation platform with flexible configuration, precise computing, friendly interface and convenient use by the successful connection between Delphi and Matlab, and provides the necessary simulation experiment and theoretical verification conditions for researching the dynamic characteristics of DEH.According to the ideas of modular modeling, this thesis builds the model and masks it of each part of DEH in Simulink. The information of all models has been saved in the database for the amending of the DEH block library. This research achieves the application of Genetic Algorithms in parameter identification by programming in Matlab and improves the actual effect of parameter identification. The platform interface has been completed in Delphi, and achieves the using of Matlab/simulink in the background. This platform provides functions of system modeling, system simulation, parameter identification, database management and command window.This thesis uses the data of the governor (DEH) test of Songyu power plant unit 4, and does the research of model building, parameter identification and dynamic simulation on this platform. The study result shows that the simulation results on this platform approach the simulation results of the classic governor models, the accuracy of the model can be satisfied, and the applicability of this platform has been validated. This thesis solves the difficult tech problem of data communication connection between Delphi and Matlab, opens a new way for the integration and application of different computer languages. And it establishes the DEH modeling and simulation configuration platform, and provides a good environment for researching the characteristics of DEH.更多还原