具多輸入電源之直流微電網系統開發

• Main Authors: Jung-Hao Chang, 張容豪
• Other Authors: Long-Yi Chang
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/vj6rhg

碩士 === 國立勤益科技大學 === 電機工程系 === 104 === The main purpose of this thesis is to apply a fuel cell in the DC Micro-Grid with diesel engine generator and battery for promoting the performance. The proposed system structure includes an interleaved inductor-couple converter and a power management system. In order to connect fuel cell with DC bus, this thesis presents a converter with high voltage conversion ratio, low input current ripple, low current and voltage ratings of power switches. It is designed to boost a low input voltage to a specified voltage level for DC load or high voltage DC bus, thus providing a high voltage conversion ratio. The presented converter mainly involves coupled inductors and capacitor of voltage doublers for boosting purposes, but particularly the voltage ratings of the involved power switches and diodes remain unaffected as the output voltage is boosted. Using an interleaving trigger mechanism, this circuit configuration can not only suppress the input current ripple, but also to reduce the current ratings of power switches. In simple terms, it is a low cost, but high voltage gain, converter due to a smaller number of the required components and lower current and voltage ratings of power switches. The proposed converter with soft-switching technology is able to decrease switching loss and improve conversion efficiency. It can achieve zero voltage switching (ZVS) and zero current switching (ZCS) function by augmenting a resonance branch in converter and an existing modified switch trigger strategy. Finally, for promoting the performance and making the most of fuel cell, so the proposed system adds diesel engine generator and battery as accessory power supply, and the proposed power management system could integrate fuel cell, diesel engine generator and battery to connect fuel cell with DC bus. It is implemented by the digital signal processor to actual testing and control. The proposed circuit architecture and power management strategy are verified by simulation and experimental results.