Patent ID: 11916270
Assignee: ZHEJIANG UNIVERSITY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 1:
2. The active fault-tolerant temperature control method for the proton exchange membrane fuel cell system according to claim 1, wherein the fuel cell system temperature control model in step S1 comprises a fuel cell temperature model, a stack voltage model, and a semi-empirical model of an auxiliary system;
1) establishing the following fuel cell temperature model according to an energy conservation law and a thermodynamic principle;, M
      st
    
    ⁢
    
      C
      st
    
    ⁢
    
      
        dT
        
          st
          ,
          out
        
      
      dt
    
  
  =
  
    
      
        Q
        .
      
      fuel
    
    +
    
      
        Q
        .
      
      in
    
    -
    
      
        Q
        .
      
      out
    
    -
    
      
        Q
        .
      
      elec
    
    -
    
      
        Q
        .
      
      cl
    
    -
    
      
        Q
        .
      
      loss
    
  

wherein, Mst denotes mass of a stack, Cst denotes a thermal capacity of the stack; Tst,out denotes a temperature of the stack, and the temperature is an outlet temperature of stack cooling water; {dot over (Q)}fuel denotes chemical energy brought in by reactants in the stack, {dot over (Q)}in denotes energy brought in by input gases in the stack, {dot over (Q)}out denotes energy taken out by output gases, {dot over (Q)}elec notes load output power in the stack, {dot over (Q)}cl denotes energy taken away by the stack cooling water, and {dot over (Q)}loss denotes heat dissipation of the stack;
the stack is an abbreviation of a fuel cell stack;
2) establishing the stack voltage model according to a electrochemistry principle; and
3) establishing the semi-empirical model of the auxiliary system for the auxiliary system;
the auxiliary system comprises a radiator and a pump connected to the stack, and the semi-empirical model comprises a pump model and a radiator model; and the pump model is obtained by fitting a pump voltage Vpump with a flow rate Wcl, with a specific form as follows:

Wcl=0.044Vpump3−0.37Vpump2+3.2Vpump−3.05

wherein, the radiator model is obtained by fitting a radiator outlet temperature difference Tdiff, a flow rate Wcl, a fan speed ω, and room temperature T0, with a specific form as follows:, T
      .
    
    diff
  
  =
  
    
      
        10
        ·
        
          
            F
            1
          
          ⁡
          
            (
            ω
            )
          
        
      
      -
      
        T
        diff
      
      -
      
        
          F
          2
        
        ⁡
        
          (
          
            T
            0
          
          )
        
      
    
    
      
        
          -
          2.5
        
        ⁢
        
          W
          cl
        
      
      +
      27.5
    
  

wherein, F1(ω) denotes a non-linear conversion function of the fan speed ω, and the F1(ω) is defined as follows:, F
      1
    
    ⁡
    
      (
      ω
      )
    
  
  =
  
    {
    
      
        
          0
        
        
          
            ω
            ∈
            
              (
              
                0
                ,
                0.5
              
              )
            
          
        
      
      
        
          ω
        
        
          
            ω
            ∈
            
              [
              
                0.5
                ,
                1
              
              )
            
          
        
      
    
  

F2(T0) denotes an empirical heat-dissipation function, and the F2(T0) is defined as follows:

F2(T0)=(T0−25)/ln(T0/25)−25