| Summary: | 碩士 === 國立臺灣大學 === 工程科學及海洋工程學研究所 === 101 === The thesis aims to investigate three different types of hydraulic variable speed transmission system for 2MW wind turbines. Instead of the gear box, the hydraulic variable speed transmission system can achieve a steady rotational speed for the generator of 2MW wind turbine for avoiding the rectification and increasing the electric generation efficiency.
The mathematical models of three different types of hydraulic variable speed transmission system, including the direct-driving hydrostatic transmission system, feedback-driving hydrostatic transmission system and feedback-driving hydrodynamic transmission system, are derived respectively. The dynamic simulation of the three systems is implemented via MATLAB/SIMULINK. For achieving the constant rotational speed control of generator, fuzzy sliding mode control is used for the controller design. Finally, open-loop simulation of the three transmission systems and closed-loop simulation of constant rotational speed control are performed for verifying the feasibility and the control performance.
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