Title page for etd-1227112-113452


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URN etd-1227112-113452
Author Chia-Chun Tsai
Author's Email Address No Public.
Statistics This thesis had been viewed 5336 times. Download 293 times.
Department Electrical Engineering
Year 2012
Semester 1
Degree Ph.D.
Type of Document
Language zh-TW.Big5 Chinese
Title Study of Linear Equivalent Circuits of Electromechanical Systems for Turbine Generator Units
Date of Defense 2012-12-21
Page Count 110
Keyword
  • Torsional Vibration
  • Electromechanical Analogy
  • Electric Arc Furnace
  • Hydro Turbine Generator
  • Wind Turbine Generator
  • Steam Turbine Generator
  • Micro Turbine Generator
  • Abstract The thesis utilizes the analogy in dynamic equations between a mechanical and an electrical system to convert the steam-turbine, micro-turbine, wind-turbine and hydro-turbine generator mechanical model to equivalent electrical circuit models respectively. And based on the round rotor type and permanent magnetic rotor type synchronous generators’ dynamic equations, as well as their electromagnetic torque equations, the equivalent electrical interface circuits were derived respectively. By using the interface circuit, the circuit model of synchronous generator and the equivalent electrical circuit model of turbine-generator mechanism can thus be combined into the electromechanical integrated circuit model (Thevenin’s analogy circuit model and Norton's analogy circuit model). The electromechanical integrated circuit model is helpful for analyzing the energy conversion, power transmission and interactions between the mechanical and electrical systems for a turbine generator unit. In order to learn about these electromechanical interactions by using the proposed electromechanical integrated circuit model, the thesis has made a study on the torsional mode frequencies for a small gas turbine generator unit and for a large steam turbine generator unit respectively. By way of the frequency scanning and eigenvalue calculation, it is found that the torsional mode frequencies can be changed due to the electromechanical integration. Moreover, the small unit was more affected by the electromechanical integration than the large unit. Finally, we studied the effect of operations of an Electric Arc Furnaces (EAF) on torsional vibrations of a low capacity turbine generator. The electric system studied belongs to a practical steel plant in an industrial park. Based on the electromechanical integrated equivalent circuit model, a flywheel coupling shaft was designed. It is found by simulations that the coupling shaft can be quite effective in alleviating vibrations caused by the system unbalance arising from the EAF operations.
    Advisory Committee
  • Ching-Yin Lee - chair
  • Ming-Yuan Cho - co-chair
  • Chwen Chyn - co-chair
  • Ming-Tong TSAI - co-chair
  • Shyh-Jier Huang - co-chair
  • Ta-Peng Tsao - advisor
  • Chin-Sien Moo - advisor
  • Files
  • etd-1227112-113452.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2012-12-27

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