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Research on dynamic decoupling control of air supplying loop in fuel cell system based on pressure compensation

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Abstract

This study establishes a simulation model of the voltage output of a fuel cell stack based on its basic design parameters. Under the condition that the number of cells in the stack remains unchanged, the output capacity of the stack from the control level is explored to increase the power level. This study optimizes the system, analyzes the game process between the parasitic power supply system and the output power of the fuel cell stack, and optimizes the output capacity of the fuel cell stack by compensating the backpressure. To strengthen the flow-pressure coupling during pressure compensation, the principle of auto-disturbance decoupling control is applied to the strong coupling system to design a flow-pressure dynamic decoupling controller that can weaken the flow-pressure coupling effect.

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Abbreviations

a i :

Fitting coefficient

b i :

Fitting coefficient

c i :

Fitting coefficient

C d :

Nozzle flow coefficient

C p :

Specific heat capacity of air

d c :

Compressor blade diameter

E Nernst :

Nernst voltage

f(θ):

Opening function of the backpressure valve

I st :

Stack current

K air :

Pressure compensation factor

M a :

Molar mass of air

\(M_{O_{2}}\) :

Molar mass of oxygen

n fc :

Number of cells

N cr :

Corrected compressor speed

P atm :

Atmospheric pressure

p cp,in :

Air pressure at compressor inlet

p cp,out :

Air pressure at compressor outlet

P rm :

Backpressure

Psm :

Intake pressure

r v :

Backpressure valve opening radius

T cp,in :

Air temperature at compressor inlet

T m :

Time constant related to the compressor

U c :

Blade tip speed of air compressor

V act :

Activation polarization voltage

V conc :

Concentration polarization voltage

V fc :

Stack voltage

V ohm :

Ohmic polarization voltage

V sm :

Volume of the intake loop

w :

Angular velocity of the air compressor

W air :

Air flow from compressor to stack

W air_rec :

Required air flow

W air_req :

Air compressor required air flow

W cp :

Intake mass flow rate

W cr :

Air compressor outlet flow

\(W_{O_{2}\_rec}\) :

Required oxygen flow

W sm,out :

Stack’s exhaust flow

ω* :

Reference speed of the compressor

\(X_{O_{2}}\) :

Mole fraction of oxygen to air

ρ a :

Air density

\(\lambda_{O_{2}}\) :

Excess ratio

\(\lambda_{O_{2}\_ref}\) :

Reference excess ratio

θ :

Backpressure valve opening

Y :

Specific heat coefficient of gas at a fixed pressure

ψ :

Dimensionless parameters

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Acknowledgments

This work was supported by the Nation Key Research and Development Program (2018YFB0105300), China.

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Authors and Affiliations

  1. College of Automotive Engineering, Jilin University, Changchun, Jilin, 130025, China

    Dafeng Song, Fanyong Zeng & Qingtao Wu

  2. State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, Jilin, 130025, China

    Xiaohua Zeng

Authors
  1. Dafeng Song
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  2. Fanyong Zeng
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  3. Xiaohua Zeng
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  4. Qingtao Wu
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Corresponding author

Correspondence to Xiaohua Zeng.

Additional information

Dafeng Song obtained his Ph.D. from the College of Automotive Engineering of Jilin University in 2005. He has been teaching at Jilin University and is currently a Professor at Jilin University. He is mainly engaged in vehicle chassis electric control and hydraulic control technology, including electronic control suspension, brake/drive control subsystem and other aspects of research work.

Fanyong Zeng is a graduate student in the College of Automotive Engineering of Jilin University. His main research direction is fuel cell vehicle control and energy management.

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Song, D., Zeng, F., Zeng, X. et al. Research on dynamic decoupling control of air supplying loop in fuel cell system based on pressure compensation. J Mech Sci Technol 35, 2677–2688 (2021). https://doi.org/10.1007/s12206-021-0538-8

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  • DOI: https://doi.org/10.1007/s12206-021-0538-8

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