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

Abstract

The invention discloses a control method for suppressing the self-starting surge current of a methanol reforming hydrogen fuel cell connected to a grid. The present invention is a control method for inhibiting the grid-connected self-starting surge current of methanol reforming hydrogen fuel cell, comprising: the main circuit of the fuel cell is connected in series by the grid, the grid-connected inverter, the DC / DC converter, and the fuel cell stack, It is used to realize the grid-connected power generation function of the fuel cell; the auxiliary power supply circuit of the temperature control circulation system of the fuel cell is composed of a starting power supply, a DC / DC converter, a heating body and an electric pump connected in parallel, and is mainly used to maintain the reaction temperature of the fuel cell and control the electrolysis Liquid circulation speed; Among them, the DC / DC converter is composed of an interleaved parallel BuckBoost circuit and a high-frequency isolated full-bridge DC / DC circuit in series, and the grid-connected inverter is composed of a three-phase full-bridge DC / AC circuit. The beneficial effect of the present invention is that the current impact in the self-starting process of the fuel cell can be effectively suppressed, the actual demand for inductance can be greatly reduced, the volume and weight of the system can be reduced, and the power density can be increased.

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...

AI Technical Summary

Problems solved by technology

[0005] The traditional technology only suppresses the grid-connected self-starting inrush current through a current-limiting inductor. However, since the internal resistance of the fuel cell is small and changes significantly with parameters such as temperature, pressure, and fuel purity, it is usually necessary to configure the DC side of the converter. Larger inductance can suppress the surge current rise and current peak generated during the self-starting process, thus greatly sacrificing the volume power density and weight power density of the fuel cell grid-connected system

Images