| Summary: | 碩士 === 國立宜蘭大學 === 電機工程學系碩士班 === 98 === This thesis presents a filed programmable gate array (FPGA)-based control circuit for controlling the soft-switching three-phase voltage-doubler active power filter. A low cost four main switches and four auxiliary switches power converter configuration of the active power filter is proposed. All main switches in the proposed soft-switching active power filter operate at zero-voltage-switching (ZVS) turned-on. Also, the auxiliary switches operate at zero-current-switching (ZCS) turned-off. The reduction in the number of switches can also increase the reliability, since the control circuits are thereby reduced to two sets. Moreover, the proposed soft-switching active power filter can compensate the current harmonics, improve the power factor and balance the unbalanced load. In addition, a simple feedforward control, based on the energy balance concept is proposed to control the voltage of an energy-storage capacitor. Because the energy change in the energy-storage capacitor can be fast compensated, a small energy-storage capacitor is required. The advantages of the proposed active power filter are low cost, small size and fast transient response. Finally, some simulation and experimental results are presented for verification.
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