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

Claim 1:
2. The SVPWM method for the any level cascaded H-bridge inverter according to claim 1, wherein: in the step 2), after dividing the multilevel space vector diagram in the Cartesian coordinates into the two types of the rectangles, the method determines in which type of the rectangles that the reference vector is located in is as follows:
first, a quantization factor (qα) of the α-axis and a quantization factor (qβ) of the β-axis are calculated by the following formula:, {
        
          
            
              
                
                  q
                  α
                
                =
                
                  floor
                  ⁡
                  
                    (
                    
                      
                        V
                        
                          ref
                          ⁢
                          
                            
                          
                          ⁢
                          α
                        
                      
                      /
                      
                        0
                        .
                        5
                      
                    
                    )
                  
                
              
            
          
          
            
              
                
                  q
                  β
                
                =
                
                  floor
                  ⁡
                  
                    (
                    
                      
                        V
                        
                          ref
                          ⁢
                          
                            
                          
                          ⁢
                          β
                        
                      
                      /
                      
                        
                          3
                        
                        2
                      
                    
                    )
                  
                
              
            
          
        
      
    
    
      
        (
        1
        )
      
    
  

where, Vrefα and Vrefβ are components of the α-axis and the β-axis of the reference vector in the Cartesian coordinates, respectively; and floor(•) represents a downward rounding function;
then, judges whether the reference vector is located in the type A rectangle or the type B rectangle by using the following formula:, k
          
            r
            ⁢
            e
            ⁢
            c
          
        
        =
        
          {
          
            
              
                
                  0
                  ⁢
                  
                    
                  
                  ,
                
              
              
                
                  
                    when
                    ⁢
                    
                      
                    
                    ⁢
                    
                      q
                      α
                    
                  
                  +
                  
                    
                      q
                      β
                    
                    ⁢
                    
                      
                    
                    ⁢
                    is
                    ⁢
                    
                      
                    
                    ⁢
                    even
                  
                
              
            
            
              
                
                  1
                  ⁢
                  
                    
                  
                  ,
                
              
              
                
                  
                    when
                    ⁢
                    
                      
                    
                    ⁢
                    
                      q
                      α
                    
                  
                  +
                  
                    
                      q
                      β
                    
                    ⁢
                    
                      
                    
                    ⁢
                    is
                    ⁢
                    
                      
                    
                    ⁢
                    odd
                  
                
              
            
          
          ⁢
          
            
          
        
      
    
    
      
        (
        2
        )
      
    
  

where, krec represents a judgement coefficient of the rectangles; when krec equals 0, the reference vector is in the type A rectangle; and when krec equals 1, the reference vector is in the type B rectangle.