| Summary: | 碩士 === 國立成功大學 === 電機工程學系 === 103 === This thesis employs a squirrel-cage induction generator (SCIG) and a permanent-magnet synchronous generator (PMSG) respectively driven by a horizontal-axis tidal turbine to constitute a tidal power generation system. The thesis presents the stability analysis of two system configurations. System configuration 1 is an SCIG-based tidal turbine generation system connected to a power grid and fed to an isolated load, respectively. System configuration 2 is a hybrid SCIG-based and PMSG-based offshore tidal farm fed to a power grid using a static synchronous compensator (STATCOM). The q-d axis equivalent-circuit model is derived to establish the complete system model under three-phase balanced conditions. A damping controller of lead-lag type of the proposed STATCOM is designed by using residue method, and the performance of the studied system with and without the designed controller is also compared. Steady-state operating characteristics and eigenvalue variations of the studied system under different operating conditions are performed. Dynamic and transient simulations of the studied system subjected to a tidal-speed disturbance, a torque disturbance, and a three-phase short circuit fault at the power system are also carried out. It can be concluded from the simulation results that the proposed STATCOM joined with the designed controller can effectively improve the stability of the studied system.
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