| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 96 === This thesis is concerned with the development of performance evaluation simulator for wind power systems and wind turbine simulator. The former includes wind turbine, permanent-magnet synchronous generator(PMSG), three-phase rectifier and inverter, maximum power point tracking(MPPT) as well as grid-connected operation, while the later determines the torque command for prime mover by solving the nonlinear equations characterizing the input-output relationship of wind blade. The torque command is then used by PMSG to generate power for load in wind turbine simulator. In both of the above studies, Matalab/Simulink is used.
In the performance simulation system, a lowpass LC filter is introduced to not only suppress switching harmonics, but also detect the speed and position of PMSG rotor, thereby completes speed sensorless operation. In addition, pole-zero cancellation is adopted to design the proportional-integral controllers for rectifier and inverter. Moreover, the closed-loop control of generator speed is developed to achieve MPPT and reduce noise.
A 30kW grid-connected wind power system has been simulated. Sinusoidal output voltage of 220V and frequency of 60Hz is obtained. Besides, experimental results indicate that the torque command determined for the wind turbine simulator can drive the prime mover and PMSG satisfactorily.
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