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The Research on Steam Turbine Parameters Optimization and Fault Diagnosis of DEH

Author: XiaoLinHai
Tutor: YanShuTian
School: Lanzhou University of Technology
Course: Mechanical Manufacturing and Automation
Keywords: steam turbine DEH simulation research fuzzy control fault diagnosis
CLC: TM311
Type: Master's thesis
Year: 2011
Downloads: 117
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Abstract


Steam Turbine is one of the important equipment in the thermal power plant,and the control of the steam turbogenerator unit runns through the whole process of power generation. Its effect directly relates to the electrical network’s quality and the unit’s safety,stability,and economy.The 300MW condensing steam turbogenerator unit is regarded as a researehful object in this thesis.The mathematic models of the main component assemblies are built by using ihe approach of mechanism analysis.The DEH system based on cascade PID control strategy which is widely used nowadays is researched by simulation approach.The approach of parameter regulating is concluded.The out put curves of rotating speed and power of the control system with kinds of perfurbations are given,and the system’s robustness is also researched by simulation approach.The primary frequency modulation of DEH system is researched by simulation approach,too.The simulation results indicate that the modulation effect is better if flequency difference signal is connected to the governing valve than to the power controller.The rotating speed inequality rate’s effect on the primary flequency modulation’s characteristic is discussed.The current control strategy is improved by combining fuzzy control to PID control in this thesis.The approach of parameter regulating of the control system that uses new control strategy is given,and the control capability of the two control strategies is compared and analysed.The results show that the control system that uses the new strategy has better control effect than current system with fixed value’S perturbation,steam pressure’s perturbation and governing stage’S perturbation.But their robustness is almost the same.governing system.The research in this thesis has a further improving control quality of the steam turbine,providind reference for put forward and researching the design methods with optimizing performance of the unit control system.The dynamic fault diagnosis database was established based on the research for fault mode and afult influence of DEH,inaddition,based on Browser/Server framework,the DEH dynamic fault diagnosis query system was developed,which could be used from long distance through internet.

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CLC: > Industrial Technology > Electrotechnical > Motor > Generators, large the generator group ( Zonglun,) > Turbine Generator
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