| Summary: | 碩士 === 明新科技大學 === 電機工程系碩士班 === 104 === This thesis proposed a novel power factor controller for vertical axis small wind generator. Unlike traditional power factor control method, which uses rotor field-oriented vector control, the control variable is tranformed from the stationary coordinate to synchronous rotation coordinate. By using the synchronously rotating coordinate to design PI controller, the three-phase output phase voltage and current signals of wind turbines can be the same phase. This can increase the efficiency of the wind turbine's output power. First, by using the PLL scheme, we capture the wind generator line voltage angle. Then the phase angle of the phase voltage can be obtained and based on which the current control output signal is calculated in the stationary coordinate. Next, a TMS320 F28335 digital signal processor is used to read the voltage and current signals. After PFC digital control, the wind turbine output current and the voltage can have the same phase. This method does not require the rotor position sensor and therefore cost can be reduced. This method advantage is no rotor position sensor in order to reduce costs.
In this thesis, the simulation uses PSIM and a 300W (DS-300) vertical axis wind turbine. The system control core used DSP TMS320 F28335 digital signal processor as, and uses C programming language written. A 300W (DS-300) vertical axis wind turbine is the test subjects to verify the correctness of the closed-loop digital system. In order to verify the feasibility of this system, we used a TECO inverter SPEECON 7200MA to simulate the real environment under different wind speed.
Key words: wind generators, PFC Control, phase-locked loop (PLL), PI controller.
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