Wind power converter device and converter device

Patent metadata

Field	Value
Publication number	US-9768706-B2
Application number	US-201514794844-A
Country	US
Kind code	B2
Filing date	Jul 9, 2015
Priority date	Sep 5, 2014
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

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.

First claim

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, wherein the generator side converters comprise a primary generator side converter and a plurality of secondary generator side converters;
a DC bus module electrically coupled between the grid side converters and the generator side converters; and
a plurality of secondary generator side control modules each corresponding to one of the secondary generator side converters, each of the secondary generator side control modules receives a three phase secondary input current amount corresponding to the generator side inputs of the corresponding one of the secondary generator side converter, a second axis general given current component, and a secondary DC voltage amount corresponding to the first and the second DC outputs of the corresponding one of the secondary generator side converter to generate a three phase secondary voltage control signal accordingly to control the corresponding one of the secondary generator side converter, wherein each of the secondary generator side control modules generates a second axis secondary independent given current component according to the corresponding secondary DC voltage amount.

2. The wind power converter device of claim 1 , wherein each of the secondary generator side control modules comprises:
a current retrieving unit is configured to retrieve the three phase secondary input current amount;
a first converting unit is configured to convert the three phase secondary input current amount to a first axis secondary current component and a second axis secondary current component;
a first computing unit is configured to perform computation to generate a first axis difference according to the first axis secondary current component and a first axis secondary independent given current component;
a voltage retrieving unit is configured to retrieve the secondary DC voltage amount;
a voltage difference computing unit is configured to perform computation to generate a voltage difference according to the secondary DC voltage amount and a referent voltage amount;
a voltage control unit is configured to generate the second axis secondary independent given current component according to the voltage difference;
a second computing unit is configured to perform computation to generate a second axis difference according to the second axis secondary current component, the second axis general given current component and the second axis secondary independent given current component;
a first current control unit is configured to generate a first axis secondary voltage control signal according to the first axis difference;
a second current control unit is configured to generate a second axis secondary voltage control signal according to the second axis difference; and
a second converting unit is configured to convert the first axis secondary voltage control signal and the second axis secondary voltage control signal to the three phase secondary voltage control signal.

3. The wind power converter device of claim 2 , wherein the first converting unit comprises a dq rotation coordinate that comprises a d axis and a q axis, wherein the first axis secondary current component corresponds to a reactive current component of the d axis and the second axis secondary current component corresponds to an active current component of the q axis.

4. The wind power converter device of claim 1 , further comprising a primary generator side control module corresponding to the primary generator side converter to receive the second axis secondary independent given current components outputted from the secondary generator side control modules to generate a total second axis secondary independent given current, and to generate a three phase primary voltage control signal according to a three phase primary input current amount corresponding to the generator side inputs of the primary generator side and the total second axis secondary independent given current to control the primary generator side converter, in which the primary generator side control module generates the second axis general given current component.

5. The wind power converter device of claim 4 , wherein the primary generator side control module further comprises:
a current retrieving unit is configured to retrieve the three phase primary input current amount;
a first converting unit is configured to convert the three phase primary input current amount to a first axis primary current component and a second axis primary current component;
a first computing unit is configured to perform computation to generate a first axis difference according to the first axis primary current component and a first axis primary independent given current component;
a second computing unit is configured to perform computation to generate a second axis difference according to the second axis primary current component, the total second axis secondary independent given current and the second axis general given current component;
a first current control unit to generate a first axis primary voltage control signal according to the first axis difference;
a second current control unit to generate the second axis primary voltage control signal according to the second axis difference; and
a second converting unit to convert the first axis primary voltage control signal and the second axis primary voltage control signal to the three phase primary voltage control signal.

6. The wind power converter device of claim 4 , wherein the primary generator side control module communicates with the secondary generator side control modules, such that the primary generator side control module delivers the second axis general given current component to the secondary generator side control modules and the secondary generator side control modules deliver the second axis secondary independent given current component to the primary generator side control module.

7. The wind power converter device of claim 1 , wherein the DC bus module 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.

8. The wind power converter device of claim 7 , further comprising a plurality of chopper circuits each electrically coupled to two ends of each of the bus capacitors.

9. 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.

10. 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.

11. 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 ge

Assignees

• Delta Electronics Inc

Inventors

• Wang chang-yong
• Cai Li
• Lu Yan-Song

Classifications

• Y02E10/76

  Power conversion electric or electronic aspects · CPC title

• Y02E10/72

  Wind turbines with rotation axis in wind direction · CPC title

• H02M7/7575

  for high voltage direct transmission link · CPC title

• H02M5/4585 Primary

  having a rectifier with controlled elements · CPC title

• F03D9/255

  connected to electrical distribution networks; Arrangements therefor · CPC title