本文提出一交錯式高升壓比多階層轉換器，可應用在太陽能光電板之低電壓輸出特性發電系統。此轉換器由兩級電路所組成，前級電路基於Cockcroft-Walton(CW)倍壓器之高升壓比特性，無須使用升壓變壓器即可達到直流高電壓輸出，且以交錯式方式控制降低輸入電流漣波。後級電路因CW倍壓器輸出電容串接的特性，結合五階層變流器，以提供單相60Hz交流電源並降低輸出電壓諧波。本文將轉換器應用於太陽能發電系統，使用擾動觀察法作為最大功率點追蹤控制策略，以數位信號處理器(DSP, TMS320F28069)數位方式實現，使太陽能達到最大功率輸出，並以電壓紀錄器紀錄系統日功率變化以驗證其正確性。

This thesis proposes an interleaved high step-up multilevel converter for low-voltage dc generation systems such as photovoltaic modules. The converter consists of a two-stage power converter topology. The first stage converter can provide high step-up ratio without using the step-up transformers based on the high step-up ratio characteristic of Cockcroft-Walton (CW) voltage multiplier and reduce input current ripple due to interleaved operation. Because of the output side of CW multiplier consists of cascaded capacitors, the second stage utilizes five-level inverter to provide single phase 60Hz ac output and reduce output voltage harmonic distortion. In additional, the converter is applied to photovoltaic generation system. The perturbation and observation method is used for maximum power point tracking to achieve the maximum output power of solar energy and implemented by a digital signal processor (DSP, TMS320F28069). The validity of the proposed solar system is verified by a voltage recorder recording the variation of the power from system in whole day.

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