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Deal on Characteristic Curves of Reversible Pump-turbine and Study the Visualization

Author: CaiTieLi
Tutor: WangLinSuo
School: Yangzhou University
Course: Water Resources and Hydropower Engineering
Keywords: Pump turbine Least squares surface Visual Basic AutoCad Visualization System
CLC: TV734.1
Type: Master's thesis
Year: 2009
Downloads: 197
Quote: 1
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Abstract


With the increasing of the social economy and people's living standards, while the rapid growth in the power load, the load characteristics due to the change of the power structure has greatly changed, the general trend is rapidly increasing, the load level load rate, peak-to-valley poor growing, the quality and reliability of the power grid can not be guaranteed. Pumped Storage Power Station peaking valley filling, FM, phase modulation, and improve the quality of power supply and grid flexibility and reliability advantages become more obvious, its development has entered a new phase. Pumped storage power station capacity in recent years, the annual growth rate of more than 10% increase. Pumped Storage Power Station use of both pumps and turbine two ways of working storage units, low power load for reservoir pump operation pumped to the upper reservoir, the power load peak turbine running will absorb the excess energy grid put down the water to generate electricity. Flexible pumped storage units open to stop lifting load quickly, frequently inevitable transformation conditions, the transitional process safe and reliable running at stake. In the calculation of the transition process, need frequent application of the reversible pump turbine characteristic curve in order to transient parameters of the unit. \a large error, and because there is a multi-value, it may make the interpolation can not be performed. Therefore, the reversible turbine characteristic curve processing is an important part of the transition process and reasonable process will directly affect the accuracy and reliability of the calculation of the transition process of the pumped storage power station. Existing characteristic curve approach there are still some missing limit, to be further improved and perfected. This article in the full study and comprehensive analysis of the complete characteristic curves of three-dimensional surface treatment on the basis of a variety of characteristic curve approach, y for the two-dimensional parametric curve for relative flow angle x and guide vane degree y is the independent variable in the form of three-dimensional surface, by the least squares surface fitting a mathematical model to obtain the corresponding surface. In practical calculation process according to the need, using the partition fitting, and further improve the accuracy. Numerical processing and graphics display the characteristic curves of the reversible pump turbine, based on the analysis of several programming software, determine the use of the Visual Basic, and AutoCad mixed programming. To use and easy to manage, the pump-turbine measured data is saved in an external data file; invoked in the calculation of the transition process, and display data to facilitate the design staff query, management and maintenance of the information in the data file. This system is divided into three parts: data entry, data processing, and graphical display. And the development of fully functional, practical performance curve library, you can easily query or browse a variety of pumps, turbines and other hydro-mechanical performance curve and related parameters. The preliminary design and renovation project at the pumping station, hydropower, and other hydraulic mechanical engineering, designers can easily through some of the basic parameters and requirements in this query selection, the module has a universal and rapid characteristics.

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CLC: > Industrial Technology > Hydraulic Engineering > Hydropower utilization of hydropower project > Hydropower station construction and equipment > Mechanical and Electrical Equipment > Turbine and its equipment
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