| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 105 === In this thesis, a solid-state transformer is studied and implemented. The structure adopted is a high-frequency operated active-dual-bridge converter. Conventional transformers are widely applied in electric power systems for performing many functions, such as electric isolation, voltage level transformation, noise decoupling, etc. However, these conventional transformers have larger volume, heavy weight which are becoming unacceptable nowadays; therefore, newer technologies are highly expected. High-frequency operated solid-state transformers are one of solutions. By increasing the operating frequency, the volume and weight of the transformer can be reduced; on the other hand, phase-shift modulation can be used to regulate the power flow in either direction. However, the use of high-frequency operation induces unwanted high-frequency components, which claim for second-order low pass filters on both input and output sides to filter out these unwanted ingredients. Therefore, carefulness on design is required in order not to lose the objective of reducing weight and volume.
A prototype circuit based on ac-ac dual-active-bridge converter has been built and tested in lab successfully. The circuit is with rated of 220 Vrms input voltage, 220 Vrms output voltage and 2 kW output power. A digital-signal processor is used to realize the control of this circuit. The measured efficiency is higher than 92% within the overall range of load conditions.
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