| Summary: | 碩士 === 國立高雄應用科技大學 === 製造與管理外國學生碩士專班 === 103 === Natural resources such as oil, gases and coal are running out in these days. There would be an urgent need of the alternative power resources, and wind power is one of the principal solutions. Currently, an enormous amount of research related to wind turbines has been conducted. While various control strategies have been studied in many projects to improve the efficiency of wind turbines, these control strategies are often conducted separately. Therefore, with the sake of combining distinct control strategies together, this research has been processed. There are two main parts of this research. The first aim is to model a wind turbine driven permanent magnetic synchronous generator (PMSG) which feeds alternating current (AC) power to the utility grid. The second aim is to study the effects and the efficiency of the PMSG wind turbine which is integrated by autonomous controllers. Overall, in order to be well autonomous control, two voltage source inverters are used to control wind turbine connecting with the grid. Firstly, the generator-side inverter is used to adjust the synchronous generator as well as separate the generator from the grid when it is necessary. Secondly, the grid-side inverter is used to control the power flow between the DC bus and the AC side, and both of them are oriented control by pulse width modulation (PWM). In addition, the proportional-integral (PI) controller is enhanced to control in both inverters and the pitch angle of the wind turbine. Maximum power point tracking (MPPT) is integrated in generator-side inverter to track the maximum power when wind speed changes. The simulation results in Matlab Simulink 2012b showing the model have good dynamic and static performance. The maximum power can be tracked and the generator wind turbine can be operated in high efficiency. Thus, this research can reveal that the combination of separate control strategies tends to work well, with the accompaniment of modeling analysis.
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