| Summary: | 碩士 === 國立成功大學 === 電機工程學系碩博士班 === 96 === This thesis presents stability analysis, steady-state results, and dynamic performance of marine-current power generation systems under four configurations, i.e., marine-current induction generator (MCIG) directly connected to the grid, MCIG connected to the gird through power-electronic converters (PECs), marine-current self-excited induction generator (MCSEIG) directly connected to isolated loads, and MCSEIG connected to isolated loads through PECs. The d-q axis equivalent-circuit model is employed to establish the models for marine-current turbine (MCT), MCIG, and PECs to derive the complete dynamic equations of the studied system under three-phase balanced loading conditions. Steady-state characteristics of the studied system under different marine-current speeds, various control commands, and various parameters are examined. Dynamic simulations of the studied system subject to variable values of marine-current speed, voltage drop at utility grid, control command, loads, torque disturbance, and system paramerters are also carried out. Also, fuzzy logic control(FLC) controller is employed to improve the dynamic response of dclink voltage under torgue disturbance.
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