Patent ID: 11967907
Assignee: ZHEJIANG UNIVERSITY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. The SVPWM method for the any level cascaded H-bridge inverter according to claim 1, wherein: in the step 3), the method determines which type of the areas that the reference vector is located in is as follows:
the reference vector is decomposed into the synthesis of the active vector and the additional vector, wherein the additional vector is expressed as:, {
        
          
            
              
                
                  v
                  
                    s
                    ⁢
                    α
                  
                
                =
                
                  
                    V
                    
                      ref
                      ⁢
                      
                        
                      
                      ⁢
                      α
                    
                  
                  -
                  
                    
                      1
                      2
                    
                    ⁢
                    
                      (
                      
                        
                          q
                          α
                        
                        +
                        
                          k
                          rec
                        
                      
                      )
                    
                  
                
              
            
          
          
            
              
                
                  v
                  
                    s
                    ⁢
                    β
                  
                
                =
                
                  
                    V
                    
                      ref
                      ⁢
                      
                        
                      
                      ⁢
                      β
                    
                  
                  -
                  
                    
                      
                        3
                      
                      2
                    
                    ⁢
                    
                      q
                      β
                    
                  
                
              
            
          
        
      
    
    
      
        (
        3
        )
      
    
  

where, vsα and vsβ are components of the α-axis and the β-axis of the additional vector in the Cartesian coordinates, respectively;
then, judges whether the reference vector is located in the type I area or the type II area by using the following formula:, k
          
            r
            ⁢
            e
            ⁢
            g
          
        
        =
        
          
            
              
                (
                
                  -
                  1
                
                )
              
              
                k
                
                  
                    
                  
                  ⁢
                  rec
                
              
            
            ⁢
            
              3
            
            ⁢
            
              v
              
                s
                ⁢
                α
              
            
          
          -
          
            v
            
              s
              ⁢
              β
            
          
        
      
    
    
      
        (
        4
        )
      
    
  

where, kreg represents a judgement coefficient of the areas; when kreg is greater than 0, the reference vector is in the type I area; when kreg is less than 0, the reference vector is in the type II area; and when kreg is equal to 0, the reference vector is at a boundary of the type I area and the type II area, which is arbitrarily determined as the type I area or the type II area.