Patent ID: 11874336
Assignee: WUHAN UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 1:
2. The method according to claim 1, comprising:
obtaining the expected value VXY*(k) of the phase-to-phase voltage from VXY*(k)=½VDC (k)(SX(k)−SY(k)), and obtaining the actual value VXY(k) of the phase-to-phase voltage from, V
     
      X
      ⁢
      Y
     
    
    (
    k
    )
   
   =
   
    
     (
     
      
       
        E
        X
       
       (
       k
       )
      
      -
      
       
        E
        Y
       
       (
       k
       )
      
     
     )
    
    -
    
     R
     ⁡
     (
     
      
       
        I
        X
       
       (
       k
       )
      
      -
      
       
        I
        Y
       
       (
       k
       )
      
     
     )
    
    
     -
    
    
     
      L
      T
     
     [
     
      
       (
       
        
         
          I
          X
         
         (
         k
         )
        
        -
        
         
          I
          X
         
         (
         
          k
          -
          1
         
         )
        
       
       )
      
      -
      
       (
       
        
         
          I
          Y
         
         (
         k
         )
        
        -
        
         
          I
          Y
         
         (
         
          k
          -
          1
         
         )
        
       
       )
      
     
     ]
    
   
  
  ,, where VDC(k) is the direct current side voltage of the rectifier at the current time; SX(k) and SY(k) are respectively switching control signals of the X-phase and the Y-phase of the rectifier, SX(k)=1 represents that switches SX1 and SX2 are turned on and switches SX3 and SX4 are turned off, SX(k)=0 represents that the switches SX2 and SX3 are turned on and the switches SX1 and SX4 are turned off, and SX(k)=−1 represents that the switches SX3 and SX4 are turned on and the switches SX1 and SX2 are turned off; EX(k) and EY(k) are respectively alternating current side voltages of the X-phase and the Y-phase of the rectifier; IX(k) and IY(k) are respectively alternating current side currents of the X-phase and the Y-phase of the rectifier; R is the alternating current side equivalent resistance of the rectifier; L is the alternating current side inductance of the rectifier; T is a sampling interval time, k represents a sampling point at the current time, k−1 represents a sampling point at a previous time, and X and Y=A and B, B and C, or C and A.