High-efficiency power conversion for low power fuel cell generation system
High-efficiency power conversion for low power fuel cell generation system
复制标题
DOI：
10.1109/tpel.2005.850936
复制
发表时间：
2005-07
影响因子：
6.7
通讯作者：
R. Wai;Rou-Yong Duan
中科院分区：
文献类型：
--
作者：
R. Wai;Rou-Yong Duan
本研究提出了一种新设计的拓扑结构的燃料电池能源转换，以提供一个高度可靠的公用电源。由于燃料电池具有低电压和高电流的电能质量，由于电化学反应，高升压DC-DC转换器用于将燃料电池电压升压到恒定的DC总线电压，以供后续逆变器使用。此外，一个电流源正弦波电压逆变器的电压钳位和软开关技术的意义上设计，使使用更小的电感电流源电路和压缩的电压应力的开关约2倍的直流母线电压。在这种功率变换方案中，即使在非线性负载下，输出电压也具有失真小、动态调节速度快和对负载变化不敏感的显著特点。此外，通过一个质子交换膜燃料电池发电系统的一个例子，额定功率为250瓦的实验结果，以证明所提出的功率转换策略的有效性。根据实验测量，功率逆变器的最大效率超过95%，各种负载条件下的总谐波失真度均在1.1%以内。
This study presents a newly designed topology for a fuel cell energy source conversion in order to supply a highly reliable utility power. Because the fuel cell has the power quality of low voltage as well as high current due to the electrochemical reaction, a high step-up dc-dc converter is utilized for boosting the fuel cell voltage up to a constant dc-bus voltage for the utilization of later inverter. Moreover, a current-source sine-wave voltage inverter is designed in the sense of voltage-clamping and soft-switching techniques to enable the use of a smaller inductor in the current source circuit and the compression of the voltage stress across switches about two times of the dc-bus voltage. In this power conversion scheme, the output voltage has the salient features of lower distortion, fast dynamic regulating speed and insensitivity to load variation, even under nonlinear loads. In addition, experimental results via an example of a proton exchange membrane fuel cell generation system with 250-W nominal power rating are given to demonstrate the effectiveness of the proposed power conversion strategy. According to the experimental measure, the maximum power inverter efficiency is over 95% and the total harmonic distortions for various load conditions are all within 1.1%.