| 引用本文: | 魏业文,宁鑫淼,李 明,等.一种适用于燃料电池的新型高升压DC-DC变换器[J].电力系统保护与控制,2023,51(23):92-101. |
| WEI Yewen,NING Xinmiao,LI Ming,et al.A novel high step-up DC-DC converter for a fuel cell[J].Power System Protection and Control,2023,51(23):92-101 |
|
| 摘要: |
| 高升压DC-DC变换器是燃料电池实现并网的重要环节。针对燃料电池输出电压低、输出特性软的问题，提出一种基于开关电容的电流馈电升压变换器。首先，详细阐述了所提变换器的拓扑结构及其在连续导通和不连续导通模式下的工作原理。然后，具体分析了该变换器的电压增益、各元件的电压和电流应力。在此基础上，将其与SC-Boost、SL-Boost等变换器进行性能对比。最后，搭建一台200 W的实验样机验证了所提变换器的可行性和理论分析的正确性。所提变换器结合电流馈电结构和开关电容网络，具有电压增益高、输入电流连续且纹波低的优势，有利于延长燃料电池使用寿命。同时，通过复用开关电容中的电容-二极管(capacitor-diode, C-D)单元对开关管电压进行钳位，降低了功率元件的电压应力。因此，所提变换器适用于燃料电池并网系统。 |
| 关键词: 燃料电池 DC-DC变换器 高升压 开关电容 低电流纹波 |
| DOI：10.19783/j.cnki.pspc.230411 |
| 分类号: |
| 基金项目:国家自然科学基金青年基金项目资助(52107108)；智慧能源技术湖北省工程研究中心开放课题项目资助(2020ZHLY06)；湖北省重点研发计划项目资助(2020BAB110) |
|
| A novel high step-up DC-DC converter for a fuel cell |
|
WEI Yewen1, 2, NING Xinmiao1, LI Ming1, LI Junbo1, BAI Wenjing1
|
|
1. College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China;
2. Hubei Provincial Engineering Research Center of Intelligent Energy Technology, Yichang 443002, China
|
| Abstract: |
| The high boost DC-DC converter is an important part of a grid-connected fuel cell. A current-fed boost converter with switched capacitor focusing on low output voltage and soft output characteristics is proposed. First, the proposed converter topology and its working principle in continuous/discontinuous conduction mode are described in detail. Then, the voltage gain and the voltage/current stress of each component are analyzed concretely. The performance is compared with SC-Boost, SL-Boost and other converters. Finally, a 200 W experimental prototype is built to verify the proposed converter’s feasibility and the correctness of the theoretical analysis. The proposed converter combines the current-fed structure and the switched capacitor network. It has the advantages of high voltage gain, continuous input current and low ripple. These properties are beneficial in prolonging the service life of the fuel cell. The voltage of the switch is clamped by multiplexing the capacitor-diode (C-D) unit in the switched capacitor. This reduces the voltage stress of the power component. Therefore, the proposed converter is suitable for grid-connected fuel cell systems. |
| Key words: fuel cell DC-DC converter high step-up switched capacitor low current ripple |
