Wind power converter device and converter device

Abstract

A wind power converter device is provided. The wind power converter device includes grid side converters, generator side converters and a DC bus module. Each of the grid side converters includes grid side outputs electrically coupled to a grid and a first and a second DC inputs. Each two of the neighboring grid side converters are connected in series at the second and the first DC inputs. Each of the generator side converters includes generator side inputs electrically coupled to a generator device and a first and a second DC outputs. Each two of the neighboring generator side converters are coupled in series at the second and the first DC outputs. The DC bus module is electrically coupled between the grid side converters and the generator side converters.

What is claimed is: 
     
       1. A wind power converter device comprising:
 a plurality of grid side converters each comprising a plurality of grid side outputs electrically coupled to a grid, a first direct current (DC) input and a second DC input, wherein the second DC input of one of any two of the neighboring grid side converters is coupled in series to the first DC input of another one of the two neighboring grid side converters; 
 a plurality of generator side converters each comprising a plurality of generator side inputs electrically coupled to a generator device, a first DC output and a second DC output, wherein the second DC output of one of any two of the neighboring generator side converters is coupled in series to the first DC output of another one of the two neighboring generator side converters; and 
 a DC bus module circuit electrically coupled between the grid side converters and the generator side converters, 
 wherein the grid side converters comprise a first grid side converter, a second grid side converter and at least one intermediate grid side converter, and the generator side converters comprises a first generator side converter, a second generator side converter and at least one intermediate generator side converter; 
 the DC bus module circuit comprises a first DC bus and a second DC bus, wherein the first DC bus is electrically coupled between the first DC input of the first grid side converter and the first DC output of the first generator side converter, and the second DC bus is electrically coupled between the second DC input of the second grid side converter and the second DC output of the second generator side converter, 
 wherein the DC bus module circuit comprises a plurality of DC buses each electrically coupled to the first DC input of one of the corresponding grid side converters and the first DC output of one of the corresponding generator side converters and to the second DC input of one of the corresponding grid side converters and the second DC output of one of the corresponding generator side converters, 
 wherein the wind power converter device further comprises a plurality of generator side control modules circuits each to receive a three phase input current amount of the generator side inputs of the generator side converters and a second axis general given current component to generate a three phase voltage control signal accordingly to control the corresponding generator side converters, 
 wherein each of the generator side control modules circuits comprises: 
 a current retrieving unit circuit is configured to retrieve the three phase input current amount; 
 a first converting unit circuit is configured to convert the three phase input current amount to a first axis current component and a second axis current component; 
 a first computing unit circuit is configured to perform computation to generate a first axis difference according to the first axis current component and a first axis independent given current component; 
 a second computing unit circuit is configured to perform computation to generate a second axis difference according to the second axis current component and the second axis general given current component; 
 a first current control unit circuit to generate a first axis voltage control signal according to the first axis difference; 
 a second current control unit circuit to generate a second axis voltage control signal according to the second axis difference; and 
 a second converting unit circuit to convert the first axis voltage control signal and the second axis voltage control signal to the three phase voltage control signal. 
 
     
     
       2. The wind power converter device of  claim 1 , wherein the DC bus module circuit comprises a plurality of bus capacitors each electrically coupled between the first DC input and the second DC input of each of the grid side converters and the first DC output and the second DC output of each of the generator side converters. 
     
     
       3. The wind power converter device of  claim 2 , further comprising a plurality of chopper circuits each electrically coupled to two ends of each of the bus capacitors. 
     
     
       4. The wind power converter device of  claim 1 , wherein the grid side outputs of the grid side converters are coupled to the grid through a voltage transformer. 
     
     
       5. The wind power converter device of  claim 1 , wherein the generator device comprises a multiple groups of windings each electrically coupled to the generator side inputs of the generator side converters. 
     
     
       6. The wind power converter device of  claim 1 , wherein the generator device is a permanent magnet synchronous generator device, an excitation synchronous generator device or an induction generator. 
     
     
       7. The wind power converter device of  claim 1 , wherein the number of the generator side converters is the same as the number of the grid side converters. 
     
     
       8. The wind power converter device of  claim 1 , wherein each of the generator side converters is a two-level converter and each of the grid side converters is a two-level converter; or each of the generator side converters is a three-level converter and each of the grid side converters is a three-level converter. 
     
     
       9. The wind power converter device of  claim 1 , further comprising a plurality of chopper circuit each electrically coupled to the first DC output and the second DC output of the generator side converters. 
     
     
       10. A wind power converter device comprising:
 a plurality of grid side converters comprising a first grid side converter and a second grid side converter, each one of the grid side converters comprising a plurality of grid side outputs electrically coupled to a grid, a first direct current (DC) input and a second DC input, wherein the second DC input of the first grid side converter is electrically coupled to the first DC input of the second grid side converter;   a plurality of generator side converters comprising a first generator side converter and a second generator side converter, each one of the generator side converters comprising a plurality of generator side inputs electrically coupled to a generator device, a first DC output and a second DC output, wherein the second DC output of the first generator side converter is electrically coupled to the first DC output of the second generator side converter; and   a set of DC buses comprising a first DC bus, an intermediate DC bus and a second DC bus,   wherein the first DC bus is electrically coupled between the first DC input of the first grid side converter and the first DC output of the first generator side converter, the intermediate DC bus is electrically coupled between the second DC input of the first grid side converter and the second DC output of the first generator side converter and the second DC bus is electrically coupled between the second DC input of the second grid side converter and the second DC output of the second generator side converter;   wherein the first grid side converter is coupled in series to the second grid side converter; and   the first generator side converter is coupled in series to the second generator side converter.    
     
     
       11. The wind power converter device of claim 10, wherein the second DC output of the first generator side converter is coupled in series to the first DC output of the first generator side converter through one or more first bus capacitors; and
 the second DC input of the second grid side converter is coupled in series to the first DC input of the second grid side converter through one or more second bus capacitors.    
     
     
       12. The wind power converter device of claim 10, wherein the generator device comprises multiple groups of windings each electrically coupled to the generator side inputs of corresponding one of the generator side converters.  
     
     
       13. The wind power converter device of claim 10, wherein the plurality of generator-side converters are arranged located on a top part of a tower, and the plurality of grid-side converters are arranged on a bottom part of the tower or outside the tower.  
     
     
       14. The wind power converter device of claim 13, further comprising a plurality of chopper circuit each electrically coupled to the first DC output and the second DC output of corresponding one of the generator side converters.  
     
     
       15. The wind power converter device of claim 10, further comprising a plurality of generator side control circuits comprising a first generator side control circuit and a second generator side control circuit, wherein the first generator side control circuit is configured to receive a control command from an external controller and control the first generator side converter, and the second generator side control circuit is configured to receive the control command from the first generator side control circuit and control the second generator side converter.  
     
     
       16. The wind power converter device of claim 15, wherein each of the generator side control circuits receives an electrical signal of the corresponding generator side converter and the control command to generate a control signal accordingly to control the operation state of the corresponding generator side converter.  
     
     
       17. The wind power converter device of claim 16, wherein the electrical signal of the corresponding generator side converter is a three phase input current amount of the generator side inputs, the control command is a second axis general given current component, and the control signal is a three phase voltage control signal.  
     
     
       18. The wind power converter device of claim 15, wherein each of the generator side control circuits comprises:
 a current retrieving circuit is configured to retrieve the three phase input current amount;   a first converting circuit is configured to convert the three phase input current amount to a first axis current component and a second axis current component;   a first computing circuit is configured to perform computation to generate a first axis difference according to the first axis current component and a first axis independent given current component;   a second computing circuit is configured to perform computation to generate a second axis difference according to the second axis current component and the second axis general given current component;   a first current control circuit to generate a first axis voltage control signal according to the first axis difference;   a second current control circuit to generate a second axis voltage control signal according to the second axis difference; and   a second converting circuit to convert the first axis voltage control signal and the second axis voltage control signal to the three phase voltage control signal.