Control method for inhibiting grid-connected self-starting impulse current of methanol reforming hydrogen fuel cell

Abstract

The invention discloses a control method for inhibiting a grid-connected self-starting impulse current of a methanol reforming hydrogen fuel cell. The invention relates to a control method for inhibiting grid-connected self-starting impact current of the methanol reforming hydrogen fuel cell. A main circuit of the fuel cell is formed by connecting a power grid, a grid-connected inverter, a DC / DC converter and a fuel cell stack in series, and is used for realizing a grid-connected power generation function of the fuel cell; an auxiliary power supply loop of a temperature control circulating system of the fuel cell is formed by connecting a starting power supply, a DC / DC converter, a heating body and an electric pump in parallel, and is mainly used for maintaining the reaction temperature ofthe fuel cell and controlling the electrolyte circulating speed; the DC / DC converter is formed by connecting an interleaved BuckBoost circuit and a high-frequency isolation full-bridge DC / DC circuitin series, and the grid-connected inverter is formed by a three-phase full-bridge DC / AC circuit. The invention has the beneficial effects that the current impact in the self-starting process of the fuel cell is effectively inhibited, the actual inductance use requirement can be greatly reduced, the volume weight of the system is reduced, and the power density is improved.

Description

technical field [0001] The invention relates to the field of fuel cell system control, in particular to a control method for suppressing the self-starting surge current of a methanol reforming hydrogen fuel cell connected to a grid. Background technique [0002] Methanol reforming fuel cell is a kind of proton exchange membrane fuel cell. Methanol solution is mixed with deionized water in equimolar ratio as the main fuel and then enters the reforming chamber, and reacts CH through high temperature. 3 OH+H 2 O→CO 2 +3H 2 (ΔH 298 =49.4kJ / mol) to produce carbon dioxide and hydrogen, then the hydrogen enters the fuel cell system, and the hydrogen and oxygen are supplied to the anode and the cathode respectively through the reverse reaction of electrolyzed water. After the hydrogen diffuses outward through the anode and reacts with the electrolyte, electrons are released through the The load reaches the cathode. It has the advantages of independent design of power and capaci...

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