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CN-224203325-U - Test current generating device of grid-connected cabinet of converter

CN224203325UCN 224203325 UCN224203325 UCN 224203325UCN-224203325-U

Abstract

The application discloses a test current generating device of a grid-connected cabinet of a converter, which relates to the technical field of power electronics, and comprises an alternating current source and a transformer, wherein the input end of the alternating current source is configured as the input end of the test current generating device, the output end of the alternating current source is connected with a primary winding of the transformer, a secondary winding of the transformer is configured as the output end of the test current generating device and is connected with the machine side of the grid-connected cabinet of the converter, the number of turns of the primary winding is N times of the number of turns of the secondary winding, and the voltage output by the alternating current source can be reduced to 1/N of the voltage through the transformer.

Inventors

  • YAN PEILEI
  • WANG YUYANG
  • YAN LULU
  • HAN DEHAI

Assignees

  • 阳光电源股份有限公司

Dates

Publication Date
20260505
Application Date
20250423

Claims (10)

  1. 1. A test current generating device of a grid-connected cabinet of a converter is characterized by comprising an alternating current source (101) and a transformer (102), wherein, The input of the alternating current source (101) is configured as the input of the test current generating means; the output end of the alternating current source (101) is connected with the primary winding of the transformer (102); the secondary winding of the transformer (102) is configured as an output end of the test current generating device and is used for being connected with the machine side of the grid-connected cabinet of the converter; In the transformer (102), the number of turns of a primary winding is N times that of a secondary winding, and N is a positive number larger than 1.
  2. 2. The test current generating device of a grid-connected inverter cabinet according to claim 1, wherein the ac source (101) comprises at least one power conversion circuit (111); -the input of the power conversion circuit (111) is configured as an input of the ac source (101), -the output of the power conversion circuit (111) is configured as an output of the ac source (101); When the number of the power conversion circuits (111) is greater than 1, both sides of each of the power conversion circuits (111) are connected in parallel.
  3. 3. The test current generating device of the grid-connected cabinet of the converter according to claim 2, further comprising a current sensor (104) and a driving circuit (105); The current sensor (104) is arranged at the output end of the test current generating device; the output end of the current sensor (104) is used for being connected with the input end of the control device; the input end of the driving circuit (105) is used for being connected with the output end of the control device; The output end of the driving circuit (105) is connected with the control end of the power conversion circuit (111).
  4. 4. The test current generation device of the grid-connected cabinet of the converter of claim 3, further comprising a controller (106); the controller (106) is configured as the control device.
  5. 5. The device for generating test current of grid-connected cabinet of converter according to claim 4, wherein the communication end or the setting end of the controller (106) receives an input instruction of the amplitude of the test current; And/or the communication end or the setting end of the controller (106) receives the frequency input instruction of the test current.
  6. 6. The test current generating device of the grid-connected cabinet of the converter according to any one of claims 2 to 5, wherein the power conversion circuit (111) comprises a DC/AC conversion circuit; The direct current side of the DC/AC conversion circuit is configured as an input of the power conversion circuit (111); The alternating current side of the DC/AC conversion circuit is configured as an output of the power conversion circuit (111).
  7. 7. The test current generation device of a grid-tie cabinet of claim 6, further comprising: a direct current source connected to a direct current side of the DC/AC conversion circuit; Or the test current generating device further comprises a rectifier, wherein the alternating current side of the rectifier receives alternating current, and the direct current side of the rectifier is connected with the direct current side of the DC/AC conversion circuit.
  8. 8. The test current generating device of the grid-connected cabinet of the converter according to any one of claims 2 to 5, wherein the power conversion circuit (111) comprises an AC/AC conversion circuit; A first side of the AC/AC conversion circuit is configured as an input of the power conversion circuit (111); The second side of the AC/AC conversion circuit is configured as an output of the power conversion circuit (111).
  9. 9. The test current generating device of the grid-connected cabinet of the converter according to any one of claims 1 to 5, further comprising a capacitor (Cd); the capacitor (Cd) is arranged at the input of the ac source (101).
  10. 10. The test current generating device of the grid-connected cabinet of the converter according to any one of claims 1 to 5, further comprising a filter circuit (103); the filter circuit (103) is arranged between the output end of the alternating current source (101) and the primary winding of the transformer (102).

Description

Test current generating device of grid-connected cabinet of converter Technical Field The application relates to the technical field of power electronics, in particular to a test current generating device of a grid-connected cabinet of a converter. Background The current transformer such as a wind power converter is usually connected with a power grid through a grid-connected cabinet, and the rated current at one side of the grid-connected cabinet connected with the current transformer is continuously increased along with the gradual increase of the power level of an application system, however, the continuously increased current level also provides higher requirements for the testing equipment of the grid-connected cabinet, and the traditional current source testing equipment is limited by the design capacity of the traditional current source testing equipment and cannot meet the high-current testing requirement exceeding the set capacity of the traditional current source testing equipment. Disclosure of utility model In view of the above problems, the application provides a test current generating device of a grid-connected cabinet of a converter, so as to improve the amplitude of test current. The specific scheme is as follows: The first aspect of the application provides a test current generating device of a grid-connected cabinet of a converter, which comprises an alternating current source and a transformer, wherein, The input of the alternating current source is configured as the input of the test current generating device; the output end of the alternating current source is connected with the primary winding of the transformer; The secondary winding of the transformer is configured as an output end of the test current generating device and is used for being connected with the machine side of the grid-connected cabinet of the converter; In the transformer, the number of turns of a primary winding is N times that of a secondary winding, and N is a positive number larger than 1. In one possible implementation, the AC source includes at least one power conversion circuit; The input end of the power conversion circuit is configured as the input end of the alternating current source, and the output end of the power conversion circuit is configured as the output end of the alternating current source; When the number of the power conversion circuits is greater than 1, both sides of each of the power conversion circuits are connected in parallel. In one possible implementation, the test current generating device further comprises a current sensor and a driving circuit; the current sensor is arranged at the output end of the test current generating device; the output end of the current sensor is used for being connected with the input end of the control device; The input end of the driving circuit is used for being connected with the output end of the control device; and the output end of the driving circuit is connected with the control end of the power conversion circuit. In one possible implementation, the test current generating device further comprises a controller; The controller is configured as the control device. In one possible implementation, the communication end or the setting end of the controller receives an amplitude input instruction of the test current; And/or the communication end or the setting end of the controller receives the frequency input instruction of the test current. In one possible implementation, the power conversion circuit includes a DC/AC conversion circuit; The direct current side of the DC/AC conversion circuit is configured as an input of the power conversion circuit; The AC side of the DC/AC conversion circuit is configured as an output of the power conversion circuit. In one possible implementation, the test current generating device further comprises a direct current source connected to a direct current side of the DC/AC conversion circuit; Or the test current generating device further comprises a rectifier, wherein the alternating current side of the rectifier receives alternating current, and the direct current side of the rectifier is connected with the direct current side of the DC/AC conversion circuit. In one possible implementation, the power conversion circuit includes an AC/AC conversion circuit; A first side of the AC/AC conversion circuit is configured as an input of the power conversion circuit; The second side of the AC/AC conversion circuit is configured as an output of the power conversion circuit. In one possible implementation, the test current generating device further comprises a capacitor; the capacitor is arranged at the input end of the alternating current source. In one possible implementation, the test current generating device further comprises a filter circuit; The filter circuit is arranged between the output end of the alternating current source and the primary winding of the transformer. The test current generating device of the grid-connec