Patent ID: 11885843
Assignee: HITACHI ENERGY LTD
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 17:
18. The system according to claim 16, wherein the instantaneous measurement point voltage value is calculated by:, {
  
   
    
     
      
       
        u
        
         
          q
          -
         
         ⁢
         p
         ⁢
         1
         ⁢
         p
         ⁢
         
          2
          -
         
         ⁢
         k
        
       
       =
       
        
         u
         
          p
          ⁢
          1
          ⁢
          p
          ⁢
          
           2
           -
          
          ⁢
          k
         
        
        -
        
         (
         
          
           R
           ·
           
            i
            
             p
             ⁢
             1
             ⁢
             p
             ⁢
             
              2
              -
             
             ⁢
             k
            
           
          
          +
          
           L
           ·
           
            
             di
             
              p
              ⁢
              1
              ⁢
              p
              ⁢
              
               2
               -
              
              ⁢
              k
             
            
            dt
           
          
         
         )
        
       
      
     
    
   
   
    
     
      
       u
       
        
         q
         -
        
        ⁢
        p
        ⁢
        
         1
         -
        
        ⁢
        k
       
      
      =
      
       
        u
        
         p
         ⁢
         
          1
          -
         
         ⁢
         k
        
       
       -
       
        [
        
         
          R
          ·
          
           (
           
            
             i
             
              p
              ⁢
              
               1
               -
              
              ⁢
              k
             
            
            +
            
             
              
               k
               R
              
              ·
              3
             
             ⁢
             
              i
              
               
                0
                -
               
               ⁢
               k
              
             
            
           
           )
          
         
         +
         
          L
          ·
          
           
            d
            ⁡
            (
            
             
              i
              
               p
               ⁢
               
                1
                -
               
               ⁢
               k
              
             
             +
             
              
               
                k
                L
               
               ·
               3
              
              ⁢
              
               i
               
                
                 0
                 -
                
                ⁢
                k
               
              
             
            
            )
           
           dt
          
         
        
        ]
       
      
     
    
   
   
    
     
      
       
        k
        R
       
       =
       
        
         
          R
          0
         
         -
         
          R
          1
         
        
        
         3
         ⁢
         
          R
          1
         
        
       
      
     
    
   
   
    
     
      
       
        k
        L
       
       =
       
        
         
          L
          0
         
         -
         
          L
          1
         
        
        
         3
         ⁢
         
          L
          1
         
        
       
      
     
    
   
  
 

wherein p1 and p2 represent the first and second phases, respectively, of the three-phase transmission line of the power transmission system, uq_p1p2_k represents the instantaneous measurement point voltage value between phase p1 and phase p2 at instant k, uq_p1_k represents the instantaneous measurement point voltage value of phase p1 at instant k, up1p2_k, ip1p2_k, respectively, represent the sampled value of the voltage and the sampled value of the current between phase p1 and phase p2 at the measurement point at instant k, up1_k, ip1_k, respectively, represent the sampled value of the voltage and sampled value of the current of phase p1 at the measurement point at instant k, R and L, respectively, represent the resistance value of the resistor and the inductance value of the inductor in the time-domain lumped parameter model,, di
   
    p
    ⁢
    1
    ⁢
    p
    ⁢
    
     2
     -
    
    ⁢
    k
   
  
  dt, represents the differential value of the current ip1p2_k,, d
   ⁡
   (
   
    
     i
     
      p
      ⁢
      
       1
       -
      
      ⁢
      k
     
    
    +
    
     
      
       k
       L
      
      ·
      3
     
     ⁢
     
      i
      
       
        0
        -
       
       ⁢
       k
      
     
    
   
   )
  
  dt, represents the differential value of the value ip1_k+kL·3i0_k, R0 represents the zero sequence resistance of the three-phase transmission line, R1 represents the positive sequence resistance of the three-phase transmission line, L0 represents the zero sequence inductance of the three-phase transmission line, L1 represents the positive sequence inductance of the three-phase transmission line, and i0_k represents the zero sequence current at instant k.