| Summary: | 碩士 === 國立臺灣海洋大學 === 電機工程學系 === 102 === The main purpose of this thesis is to investigate the voltage stability of power system with a large-scale wind farm. Calculations of power flow and bus voltage variation of the system without and with the wind farm are conducted, and according to the related interconnection criteria, the fault current and cables loading are investigated to determine whether the system exceeds relevant specifications. Both the real-power-voltage curves (P-V curves) and the reactive-power-voltage curves (Q-V curves) methods are used for analyzing the voltage stability limit of the system under normal operation as well as contingency cases. In this thesis, the Changpin area power system in Taiwan with existent onshore and future offshore wind farms is taken as the study system to explore the impacts of wind farms on system voltage stability. The doubly-fed induction generator and the full converter wind turbine of the wind farms, which are set to be operated under the constant power factor control mode and constant voltage control mode, are utilized as the generating units for the wind farm and the impacts from the two types of generating units on the system are investigated based on the calculations of power flow, bus voltage variation and steady-state voltage stability. The results from the P-V and Q-V curves show that power system voltage stability will be influenced by the wind farm with different type of units under various control modes.
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