基于氢燃料电池的电能变换系统研究
发布时间：2019-06-29 22:09
【摘要】：氢能以其分布广泛、安全无污染等多种优点使其具有巨大潜力成为末来能源社会的支柱产业。氢燃料电池以由氢能到负载的媒介身份有效的解决了氢能的利用方式问题,但是由于氢燃料电池具有输出曲线伏安特性差、稳定性低、功率波动较大等特点,所以必须将其输出的电压经过DC-DC电能变换器的过渡才能对负载进行供电,研究高效稳定的电能变换系统,使氢燃料电池的输出经过升压和稳压对于未来氢能的利用具有深远意义。本文经过对氢燃料电池工作机理、内部组成以及模型构建方式的分析,通过大量查阅资料使用Matlab/Simulink的功能,对氢燃料电池进行了稳态集总参数模型的构建和仿真,通过对比分析以电流密度作为输入变量和以温度作为输入变量的PEMFC的电压输出,选择前者作为氢燃料电池的输出电能特性。由于氢燃料电池的输出电能特性不能直接对负载供电,所以选用多种隔离型、非隔离型和组合型的DC-DC电能变换拓扑进行比较分析,最终确立以Boost电路作为前级变换器、全桥整流电路作为后级变换器的两级DC-DC电能变换系统,使氢燃料电池输出的11-14V不稳定电压由通过48V和110V的两次升压达到稳定。最后对氢燃料电池两级DC-DC电能变换系统进行仿真分析,验证该系统能够在保证可靠性和稳定性的前提下,最大程度的提高氢燃料电池的电能利用率,实现了升压和稳压的功能。
[Abstract]:Hydrogen energy has great potential to become the pillar industry of energy society because of its wide distribution, safety and pollution. Hydrogen fuel cell effectively solves the problem of hydrogen energy utilization as a medium from hydrogen energy to load. However, because hydrogen fuel cell has the characteristics of poor volt-ampere characteristics of output curve, low stability, large power fluctuation and so on, it is necessary to transfer the output voltage through DC-DC power converter in order to supply power to the load and study an efficient and stable power conversion system. It is of great significance for the future utilization of hydrogen energy to boost and stabilize the output of hydrogen fuel cell. In this paper, through the analysis of the working mechanism, internal composition and model construction mode of hydrogen fuel cell, the steady state lumped parameter model of hydrogen fuel cell is constructed and simulated by consulting a large number of data, and the voltage output of PEMFC with current density as input variable and temperature as input variable is compared and analyzed, and the former is selected as the output power characteristic of hydrogen fuel cell. Because the output power characteristics of hydrogen fuel cell can not supply the load directly, a variety of isolated, non-isolated and combined DC-DC power conversion topologies are compared and analyzed. Finally, a two-stage DC-DC power conversion system with Boost circuit as the front converter and full bridge rectifier circuit as the back stage converter is established. The unstable voltage of 11 鈮，
本文编号：2508158
[Abstract]:Hydrogen energy has great potential to become the pillar industry of energy society because of its wide distribution, safety and pollution. Hydrogen fuel cell effectively solves the problem of hydrogen energy utilization as a medium from hydrogen energy to load. However, because hydrogen fuel cell has the characteristics of poor volt-ampere characteristics of output curve, low stability, large power fluctuation and so on, it is necessary to transfer the output voltage through DC-DC power converter in order to supply power to the load and study an efficient and stable power conversion system. It is of great significance for the future utilization of hydrogen energy to boost and stabilize the output of hydrogen fuel cell. In this paper, through the analysis of the working mechanism, internal composition and model construction mode of hydrogen fuel cell, the steady state lumped parameter model of hydrogen fuel cell is constructed and simulated by consulting a large number of data, and the voltage output of PEMFC with current density as input variable and temperature as input variable is compared and analyzed, and the former is selected as the output power characteristic of hydrogen fuel cell. Because the output power characteristics of hydrogen fuel cell can not supply the load directly, a variety of isolated, non-isolated and combined DC-DC power conversion topologies are compared and analyzed. Finally, a two-stage DC-DC power conversion system with Boost circuit as the front converter and full bridge rectifier circuit as the back stage converter is established. The unstable voltage of 11 鈮，
本文编号：2508158
本文链接：https://www.wllwen.com/kejilunwen/dianlilw/2508158.html
教材专著
