Research Of Power Conversion Technology Of A Pem Fuel Cell

As the ever-increasing energy crisis and serious environmental pollutions around the world, the proton exchange membrane fuel cell (PEMFC) with its high efficiency, low pollution became one of the most promising energy-conversion technologies of efficiency and clean for the 21th century. However, fuel cell is a multi-variable and strongly coupling system. In order to draw a clear picture of the dynamic characteristic of fuel cell, the work of extensive and systematic mathematical modeling and simulation are needed. What is worse, because of the generation of unstable direct current, fuel cell must be equipped with a power conversion system to produce standard DC or AC power through regulation, control and management of the output. The process of the preparation consists of:(1) A theoretical model of a PEMFC system is proposed on the basis of the principles of energy conservation and mass conservation, and the theory of electrochemistry and circuit. It can be used for experimental analysis and optimization of structural design of PEMFC.(2) A two-step DC-DC and DC-AC converter with low voltage input, low pollution and high efficiency is researched. The feature and conversion efficiency of the fuel cell is improved by adding auxiliary battery and Boost circuit in the converter.(3) The hydrogen reactor power system control platform is build up including a fuel cell stack, a humidification system, a flow control system, a temperature control system. And important parameters of the test bench are measured including the rating stack temperature, the rating reactant pressure, the stack current. The theoretical model is validated by comparison with experimental data.(4) A power conversion system of 2kw PEMFC is build up. And the DC output can stable. AC output can drive the AC load. Improve the output characteristics of fuel cells, to provide the basis for grid inverter.