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

Claim 4:
5. The SVPWM method for the any level cascaded H-bridge inverter according to claim 1, wherein that: in the step 5), the duty cycles of the NTVs are obtained of the reference vector in different positions as follow:
when the reference vector is located in the AI area or the BI area, the duty cycles of the NTVs are obtained by the following formula:, {
        
          
            
              
                
                  d
                  1
                
                =
                
                  
                    v
                    
                      s
                      ⁢
                      α
                    
                  
                  -
                  
                    
                      v
                      
                        s
                        ⁢
                        β
                      
                    
                    
                      3
                    
                  
                  +
                  
                    k
                    rec
                  
                
              
            
          
          
            
              
                
                  
                    d
                    2
                  
                  =
                  
                    
                      2
                      
                        3
                      
                    
                    ⁢
                    
                      v
                      
                        s
                        ⁢
                        β
                      
                    
                  
                
                ⁢
                
                  
                
              
            
          
          
            
              
                
                  d
                  3
                
                =
                
                  1
                  -
                  
                    d
                    1
                  
                  -
                  
                    d
                    2
                  
                
              
            
          
        
      
    
    
      
        (
        5
        )
      
    
  

when the reference vector is located in the AII area or the BII area, the duty cycles of the NTVs are obtained by the following formula:, {
        
          
            
              
                
                  d
                  1
                
                =
                
                  
                    v
                    
                      s
                      ⁢
                      α
                    
                  
                  +
                  
                    
                      v
                      
                        s
                        ⁢
                        β
                      
                    
                    
                      3
                    
                  
                
              
            
          
          
            
              
                
                  d
                  2
                
                =
                
                  
                    
                      v
                      
                        s
                        ⁢
                        β
                      
                    
                    
                      3
                    
                  
                  -
                  
                    v
                    
                      s
                      ⁢
                      α
                    
                  
                
              
            
          
          
            
              
                
                  d
                  3
                
                =
                
                  1
                  -
                  
                    d
                    1
                  
                  -
                  
                    d
                    2
                  
                
              
            
          
        
      
    
    
      
        (
        6
        )
      
    
  

where, d1, d2 and d3 represent the duty cycles of v1, v2 and v3, respectively, krec represents a judgement coefficient of the rectangles, vsα and vsβ are components of the α-axis and the β-axis of the additional vector in the Cartesian coordinates, respectively.