Proton exchange membrane fuel cell emergency power generation system

Abstract

The invention discloses a proton exchange membrane fuel cell (PEMFC) emergency power generation system and provides a design method integrating new energy power generation, power conversion, data collection and high-accuracy control. The system has a function of ensuring ideal working temperature of a PEMFC while stabilizing output voltage soft in characteristic at an expected value. A power conversion unit adopts a four-switch Buck-Boost converter under an interleaving mode, data collection includes PEMFC temperature collection and collection of output voltage by the power conversion unit, and a control unit adopts a high-accuracy control algorithm according to errors between collected data and the expected value and realizes through an I / O port of a DSP. A modulation mode refers to adopting a mode of same frequency and different triggering time points for different switch sets in the power conversion unit, so that loss is lowered effectively. The system can be used for studying PEMFCpower generation principles and portable mobile power sources and can effectively prolong service life of the PEMFC.

Description

technical field [0001] The invention belongs to the field of power electronic conversion, in particular to an emergency power generation system of a proton exchange membrane fuel cell. Background technique [0002] With the rapid development of the economy, environmental problems have become more and more serious, more and more attention has been paid to efficient and clean energy power generation technologies, and new energy power generation technologies including solar energy, wind energy and hydrogen energy have developed rapidly. Among them, the proton exchange membrane fuel cell is a power generation device that directly converts the chemical energy of hydrogen into electrical energy. The products are water and heat, which are not limited by the Carnot cycle. It is one of the most ideal alternative power generation technologies in the future. [0003] At this stage, based on the consideration of technology and cost, proton exchange membrane fuel cells have not yet been...

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Problems solved by technology

[0004] There are few existing proton exchange membrane fuel cell power generation systems, and the main topology mostly adopts Buck or Boost, or Buck-Boost circuit, which can only simply boost or buck, or non-homopolar buck-boost, Wu Ping In his master's thesis "Fuel Cell Power Generation System Front-End DC / DC Converter Design", the voltage-type phase-shifted full-bridge circuit is used as the main topology, which can better achieve the desired function, but it is essentially a second-order system , which brings inconvenience to the design of related control units, and also has the problems of complex transformer design, many components, and high cost

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