本文主旨在設計及製作以數位訊號處理器為基礎之混合燃料電池及鋰電池供電系統。文中採用雙臂式昇壓型直流-直流功率轉換器可以減小直接甲醇燃料電池輸出電流漣波，並提高燃料電池使用壽命，也可穩定昇壓至直流鏈電壓並提供能量給負載使用；本文負載為無刷直流電動機，採用三相直流-交流功率轉換器搭配六步方波轉速閉迴路控制以驅動無刷直流電動機；鋰電池方面採用之雙臂式昇/降壓型直流-直流功率轉換器搭配能量管理作充放電控制，作能量補償、供應與儲存，也可以提高直接甲醇燃料電池的使用效益，即可使本混合供電系統成為不斷電之系統。
本文之系統採用運算速度快、成本低的32位元之數位訊號處理器DSP TMS320F 2808為控制核心，系統之功率轉換器控制及能量管理策略皆由軟體程式完成，不但減少硬體電路元件，並增加了系統運轉可靠度。本文使用之燃料電池其額定功率為40W，輸出電壓8~16V，鋰電池之規格為24V,10Ah。本文已完成三相變頻器驅動無刷直流電動機作為負載之混合供電系統，總輸出功率為30W，直流鏈電壓為36V，燃料電池端轉換效率為93%，鋰電池端轉換效率90%，其中燃料輸出電池漣波因素小於5.5%。最後，由實驗驗證理論分析。

This thesis is concerned with the design and implementation of a digital signal processor based fuel cell and lithium battery hybrid power system. In fuel cell system, a two-leg boost converter which is not only designed to reduce the output current ripple and increase the life time of fuel cell but also provide stable dc-link and energy to load. The load of system is brushless dc motor (BLDCM) with six-step square wave control strategy. The battery system uses two-leg boost/buck converter. It can not only compensate, supply and store energy by charging and discharging with power management, but also improve the efficiency of fuel cell. Thus this hybrid power system can serve as uninterruptible power supply.
In this system, the high-speed, low-cost, 32-bit digital signal processor TMS320LF2808 is used as the control core. The control of power converter and the method of power balance control are accomplished by software. It can not only reduce the hardware cost but also improve the system reliability. The rated power of fuel cell is 40W and output voltage range is between 8V and 16V. The capacity of lithium battery is 10Ah and normal output voltage is 24V. The load of hybrid power system is BLDCM, which is driven by three- phase inverter. A prototype of 30W and 36V dc-link voltage hybrid power system is built. Moreover, the experimental data show that the efficiency of fuel cell system reaches 93%, the efficiency of the lithium battery system reaches 90% and the output current ripple factor of fuel-cell is less than 5.5%. Thus experimental results justify the analysis.

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