| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 97 === The thesis presents the phase-angle detection of utility voltage using phased-locked-loop (PLL) technique for three-phase grid-connected power converter. A three-phase permanent–magnet synchronous generator is used to generate power for three-phase diode rectifier and boost-type dc-dc converter to maintain stable dc-link voltage for grid-connected three-phase power inverter. The proposed three-phase inverter uses voltage space vector pulse-width modulation technique to reduce the dc-link operating voltage range and the output current harmonics. Three-phase grid connection is conducted with two separate approaches：the control of q- and d-axis current under synchronous frame as well as the control of dc-link voltage. The latter method, namely, the closed-loop control of dc-link voltage provides the advantage of better input-output power balance and faster dc-link voltage response.
In this thesis, the digitized mathematical model and controller design are built and simulated by MATLAB/Simpower. Then, the high-performance and low-cost digital signal processor TMS320F2812 is used to control the power converter. The rated line-voltage is 220V and the frequency is 60Hz. Experimental results show that the power converter supplies 378W with the corresponding efficiency of 85% using ac-dc-ac power converter.
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