| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 95 === This thesis presents the development of a solar and fuel-cell hybrid power conversion system. In solar-cell system, the boost dc-dc power converter and maximum power point tracking (MPPT) are designed to achieve high power output and enhance conversion efficiency. In fuel-cell system, the phase shifted full-bridge converter adopts zero voltage and high frequency switching scheme to improve conversion efficiency and reduce the output current ripples. In addition, a boost/buck dc-dc chopper is designed to discharge or charge batteries in order to regulate the power flow between renewable energy and system loads so that it can supply stable dc power to system loads. Finally, a three-phase three-level inverter is proposed to convert dc power into ac power and reduce the output voltage harmonics. The system realized can be operated either in a stand-alone fashion or connected with power grid.
In this thesis, the digitized mathematical model and controller design are built and simulated by MATLAB/Simulink. Then, a high-performance, low-cost digital signal processor (DSP, TMS320LF2812) and complex programmable logic device (CPLD, XC9536) is used to implement the system for reducing the circuit components and cost. Experimental results for 1600W hybrid power conversion system are given to justify the analysis.
The rated line-voltage is 220V and the frequency is 60Hz. Besides, the experimental results show that the full-load efficiency of the three-phase three-level inverter reaches 93.5% and voltage harmonic distortion is 3.61%, which complies with IEEE Std. 519.
|
|---|
