A power control method for a fuel cell system

Abstract

The invention provides a power control method of a fuel cell system, including: starting the fuel cell system; judging whether the fuel cell system is in the running state, and if "yes", obtaining the required power P req ; Obtain the target current I according to the pre-obtained power-current relationship req and make the output current I of the fuel cell out equal to the target current I req ;Get the actual output power P of the fuel cell o And judge whether the actual output power is in a steady state, if "yes" calculate the power deviation and judge the rate deviation ΔP=P req -P o Whether it is greater than or equal to the preset threshold P t , if “Yes” according to the output current I out , Demand power P req Calculate the current deviation ΔI with the power deviation ΔP; make the output current of the fuel cell equal to I out +ΔI. The advantage of this method is that it does not rely on the identification process of the polarization curve to estimate the maximum net output power of the fuel cell stack, which is suitable for more application scenarios; it will not cause fluctuations in the output current of the stack and will not accelerate the stack lifetime decay.

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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