Power control method of fuel cell system

Abstract

The invention provides a power control method of a fuel cell system. The power control method comprises the following steps: starting the fuel cell system; judging whether the fuel cell system is in arunning state or not, and if yes, acquiring riding demand power Preq; solving target current Ireq according to a power-current relation obtained in advance, and enabling output current Iout of a fuelcell to be equal to the target current Ireq; acquiring actual output power Po of the fuel cell and judging whether the actual output power is in a steady state or not; if yes, calculating power deviation and judging whether the rate deviation delta P = Preq-Po is greater than or equal to a preset threshold Pt or not, and if yes, calculating current deviation delta I according to the output current Iout, the required power Preq and the power deviation delta P; and allowing the output current of the fuel cell to be equal to Iout + delta I. The method has the advantages that the maximum net output power of a fuel cell stack is estimated without depending on the identification process of a polarization curve, and the method is suitable for more application scenes; output current fluctuation of a galvanic pile cannot be caused; and the service life attenuation of the galvanic pile cannot be accelerated.

Description

technical field [0001] The invention relates to the field of fuel cell vehicle control, in particular to a power control method for a fuel cell system. Background technique [0002] A hydrogen fuel cell is a power generation device that directly converts the chemical energy generated by the reaction of hydrogen and oxygen into electrical energy through an electrochemical reaction. It has the advantages of high power generation efficiency and low environmental pollution, so it is widely used in the automotive field. The working principle of the proton exchange membrane fuel cell is that hydrogen and oxygen undergo an electrochemical reaction to generate water and output electricity at the same time. Since the voltage of fuel cell cells is usually less than 1V, in practical applications, it is necessary to connect hundreds of cells in series to form a fuel cell stack, and match the corresponding peripheral accessories to form a fuel cell system. [0003] Since the performance...

AI Technical Summary

Problems solved by technology

However, in the implementation process of this method, due to the dependence on the identification process of the polarization curve, there is a problem of insufficient data collection in this process, which will lead to the impossibility of implementing the subsequent steps and the inability to realize power adaptive control during data collection.

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