【摘要】：氫能以其分布廣泛、安全無污染等多種優(yōu)點使其具有巨大潛力成為末來能源社會的支柱產(chǎn)業(yè)。氫燃料電池以由氫能到負(fù)載的媒介身份有效的解決了氫能的利用方式問題,但是由于氫燃料電池具有輸出曲線伏安特性差、穩(wěn)定性低、功率波動較大等特點,所以必須將其輸出的電壓經(jīng)過DC-DC電能變換器的過渡才能對負(fù)載進(jìn)行供電,研究高效穩(wěn)定的電能變換系統(tǒng),使氫燃料電池的輸出經(jīng)過升壓和穩(wěn)壓對于未來氫能的利用具有深遠(yuǎn)意義。本文經(jīng)過對氫燃料電池工作機(jī)理、內(nèi)部組成以及模型構(gòu)建方式的分析,通過大量查閱資料使用Matlab/Simulink的功能,對氫燃料電池進(jìn)行了穩(wěn)態(tài)集總參數(shù)模型的構(gòu)建和仿真,通過對比分析以電流密度作為輸入變量和以溫度作為輸入變量的PEMFC的電壓輸出,選擇前者作為氫燃料電池的輸出電能特性。由于氫燃料電池的輸出電能特性不能直接對負(fù)載供電,所以選用多種隔離型、非隔離型和組合型的DC-DC電能變換拓?fù)溥M(jìn)行比較分析,最終確立以Boost電路作為前級變換器、全橋整流電路作為后級變換器的兩級DC-DC電能變換系統(tǒng),使氫燃料電池輸出的11-14V不穩(wěn)定電壓由通過48V和110V的兩次升壓達(dá)到穩(wěn)定。最后對氫燃料電池兩級DC-DC電能變換系統(tǒng)進(jìn)行仿真分析,驗證該系統(tǒng)能夠在保證可靠性和穩(wěn)定性的前提下,最大程度的提高氫燃料電池的電能利用率,實現(xiàn)了升壓和穩(wěn)壓的功能。
[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，

本文編號：2508158