CN219420368U - Switching circuit for solving impact load of doubly-fed wind power converter and converter - Google Patents
Switching circuit for solving impact load of doubly-fed wind power converter and converter Download PDFInfo
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- CN219420368U CN219420368U CN202320756704.6U CN202320756704U CN219420368U CN 219420368 U CN219420368 U CN 219420368U CN 202320756704 U CN202320756704 U CN 202320756704U CN 219420368 U CN219420368 U CN 219420368U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The utility model discloses a switching circuit for solving impact load of a doubly-fed wind power converter and the converter, wherein the switching circuit comprises a commercial alternating current power supply, an uninterruptible power supply, a controller and a doubly-fed wind power converter grid-connected contactor assembly; the commercial power alternating current power supply output end is connected with the uninterrupted power supply input end; the commercial alternating current power supply is connected with the normally closed contact input end of the intermediate relay; the uninterrupted power supply output end is connected with the normally open contact input end of the intermediate relay; the normally closed contact output end of the intermediate relay is connected with a first normally open contact and a second normally open contact of the driving relay; the switching circuit of the impact load is solved by the doubly-fed wind power converter, so that the doubly-fed current converting contactor avoids impact current, a coil of the doubly-fed current converting contactor is kept closed by UPS power after the contactor is attracted, the impact current on the UPS when the contactor is closed is avoided under the condition that the cost is not increased, the service life of a contactor device is longer, and the cost is saved.
Description
Technical Field
The utility model relates to the technical field of power supply of wind power converters, in particular to a switching circuit for solving impact load of a doubly-fed wind power converter and the converter.
Background
At present, the doubly-fed wind power converter has larger power, and the grid-connected contactor adopts a scheme of two or three contacts connected in parallel. The coils of the contactor are typically powered using UPS. When the contactor is attracted, a large impact current is generated, and particularly, a plurality of contactors are attracted simultaneously, the impact current is larger, but the maintaining current after the contactor is closed is small. So that a small capacity UPS is selected, the UPS may be at risk of overload when the contactor is closed. The cost increases due to the choice of a large capacity UPS.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a switching circuit for solving the impact load of a doubly-fed wind power converter, which enables a doubly-fed current converting contactor to avoid impact current, a coil of the doubly-fed current converting contactor is kept closed by UPS power after the contactor is attracted, the impact of the impact current on the UPS when the contactor is closed is avoided under the condition that the cost is not increased, the service life of a contactor device is longer, and the cost is saved.
In order to solve the technical problems, the utility model provides a switching circuit for solving impact load of a doubly-fed wind power converter, which comprises a commercial alternating current power supply, an uninterruptible power supply, a controller, a driving relay and a doubly-fed wind power converter grid-connected contactor assembly; the commercial power alternating current power supply output end is connected with the uninterrupted power supply input end; the commercial alternating current power supply is connected with the normally closed contact input end of the intermediate relay;
the switching circuit for solving the impact load further includes: the time relay is used for switching the power supply for maintaining the running of the grid-connected contactor coil from the mains supply to the uninterrupted power supply through the normally closed contact and the normally open contact after the load stably runs, and controlling the contact delay closing of the intermediate relay to avoid the impact of the impact current on the circuit;
the uninterrupted power supply output end is connected with the normally open contact input end of the intermediate relay; the normally closed contact output end of the intermediate relay is connected with a first normally open contact and a second normally open contact of the driving relay; the normally open contact output end of the intermediate relay is connected with a first normally open contact and a second normally open contact of the driving relay, and the normally open contact output end of the driving relay is connected with a coil of the grid-connected contactor assembly of the doubly-fed wind power converter;
the uninterrupted power supply output end is connected with the coil of the time relay through a third normally open contact of the driving relay to form a time relay coil control loop; the uninterrupted power supply output end is connected with the coil of the intermediate relay through the normally open contact of the time relay to form an intermediate relay coil control loop; the controller is connected with the driving relay.
Preferably, the drive relay has at least three normally open contacts.
Preferably, the intermediate relay is provided with at least two normally closed contacts and two normally open contacts, and is provided with a forced guiding structure for ensuring that the load cannot lose electricity when the load works normally; the intermediate relay is controlled by the time relay to be closed in a delayed mode.
Preferably, after the grid-connected contactor assembly of the doubly-fed wind power converter is powered off, the intermediate relay is powered off.
Preferably, the double-fed wind power converter grid-connected contactor assembly is composed of one contactor or a plurality of contactors connected in parallel.
In order to solve the technical problems, the utility model also discloses a double-fed wind power converter, which comprises the switching circuit for solving the impact load of the double-fed wind power converter.
After the circuit is adopted, the switching circuit for solving the impact load of the doubly-fed wind power converter is characterized by comprising a commercial power alternating current power supply, an uninterruptible power supply, a controller, a driving relay and a doubly-fed wind power converter grid-connected contactor assembly; the commercial power alternating current power supply output end is connected with the uninterrupted power supply input end; the commercial alternating current power supply is connected with the normally closed contact input end of the intermediate relay; the switching circuit for solving the impact load further includes: the time relay is used for switching the power supply for maintaining the running of the grid-connected contactor coil from the mains supply to the uninterrupted power supply through the normally closed contact and the normally open contact after the load stably runs, and controlling the contact delay closing of the intermediate relay to avoid the impact of the impact current on the circuit; the uninterrupted power supply output end is connected with the normally open contact input end of the intermediate relay; the normally closed contact output end of the intermediate relay is connected with a first normally open contact and a second normally open contact of the driving relay; the normally open contact output end of the intermediate relay is connected with a first normally open contact and a second normally open contact of the driving relay, and the normally open contact output end of the driving relay is connected with a coil of the grid-connected contactor assembly of the doubly-fed wind power converter; the uninterrupted power supply output end is connected with the coil of the time relay through a third normally open contact of the driving relay to form a time relay coil control loop; the uninterrupted power supply output end is connected with the coil of the intermediate relay through the normally open contact of the time relay to form an intermediate relay coil control loop; the controller is connected with the driving relay; the switching circuit of the impact load is solved by the doubly-fed wind power converter, so that the doubly-fed current converting contactor avoids impact current, a coil of the doubly-fed current converting contactor is kept closed by UPS power after the contactor is attracted, the impact current on the UPS when the contactor is closed is avoided under the condition that the cost is not increased, the service life of a contactor device is longer, and the cost is saved.
Drawings
FIG. 1 is a diagram of a prior art doubly-fed wind power converter contactor power supply circuit;
fig. 2 is a circuit diagram of a switching circuit for solving the impact load of the doubly-fed wind power converter.
The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved by the application clearer and more obvious, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
In the description of the present application, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1
Referring to fig. 2, fig. 2 is a circuit diagram of a switching circuit for solving the impact load of the doubly-fed wind power converter according to the present utility model;
the embodiment discloses a switching circuit for solving impact load of a doubly-fed wind power converter, which comprises a commercial power alternating current power supply 1, an uninterruptible power supply 2, a controller 4, a driving relay K1 and a doubly-fed wind power converter grid-connected contactor assembly;
the output end of the commercial power alternating current power supply 1 is connected with the input end of the uninterrupted power supply 2;
the switching circuit for solving the impact load further includes: the relay is used for switching the power supply for maintaining the running of the grid-connected contactor coil from the mains supply to the intermediate relay 5 of the uninterruptible power supply 2 through the switching of the normally closed contact and the normally open contact after the stable running of the load, and the time relay Kt is used for controlling the contact delay closing of the intermediate relay K2 to avoid the impact of the impact current on the circuit;
the commercial power alternating current power supply 1 is connected with the normally closed contact input end of the intermediate relay K2; the output end of the uninterrupted power supply 2 is connected with the input end of the normally open contact of the intermediate relay K2; the normally closed contact output end of the intermediate relay K2 is connected with a first normally open contact and a second normally open contact of the driving relay K1; the output end of the normally open contact of the intermediate relay K2 is connected with a first normally open contact and a second normally open contact of the driving relay K1, and the output end of the normally open contact of the driving relay is connected with a coil 6 of the grid-connected contactor assembly of the doubly-fed wind power converter;
the output end of the uninterruptible power supply 2 is connected with a coil of the time relay Kt through a third normally open contact of the driving relay K1 to form a time relay coil control loop; the output end of the uninterrupted power supply 2 is connected with a coil of the intermediate relay K2 through a normally open contact of the time relay Kt to form an intermediate relay coil control loop; the controller is connected with a driving relay K1.
When the load needs to be powered, the controller 4 sends out driving to drive the relay K1 to be closed, at the moment, the load is powered by the mains supply alternating current power supply 1, after the driving relay K1 is closed, the coil of the time relay Kt is powered, after a delay of a few seconds (delay time can be set), the coil of the intermediate relay K2 is powered, the normally closed contact of the intermediate relay K2 is opened, the normally open contact of the intermediate relay K2 is closed, and the power supply of the load is switched to be the power supply of the uninterrupted power supply 2.
When the load needs to be powered off, the controller 4 sends out a command to drive the relay K1 to be powered off and disconnected.
Example two
In this embodiment, the grid-connected contactor assembly K1 of the doubly-fed wind power converter has at least three normally open contacts.
The intermediate relay K2 is provided with at least two normally closed contacts and two normally open contacts, and is provided with a forced guiding structure for ensuring that the load cannot lose electricity when the load normally works; the intermediate relay K2 is controlled by the time relay Kt to be closed in a delayed mode.
After the driving relay K1 is powered off, the intermediate relay K2 is powered off.
The grid-connected contactor assembly of the doubly-fed wind power converter consists of one contactor or a plurality of contactors connected in parallel.
Example III
The embodiment discloses a doubly-fed wind power converter, which comprises a switching circuit for solving the impact load of the doubly-fed wind power converter according to the first embodiment or the second embodiment.
The switching circuit of the impact load is solved by the doubly-fed wind power converter, so that the doubly-fed current converting contactor avoids impact current, a coil of the doubly-fed current converting contactor is kept closed by UPS power after the contactor is attracted, the impact current on the UPS when the contactor is closed is avoided under the condition that the cost is not increased, the service life of a contactor device is longer, and the cost is saved.
The preferred embodiments of the present application have been described above with reference to the accompanying drawings, and are not thereby limiting the scope of the claims of the present application. Any modifications, equivalent substitutions and improvements made by those skilled in the art without departing from the scope and spirit of the present application shall fall within the scope of the claims of the present application.
Claims (6)
1. The switching circuit for solving the impact load of the doubly-fed wind power converter is characterized by comprising a commercial power alternating current power supply, an uninterruptible power supply, a controller, a driving relay and a doubly-fed wind power converter grid-connected contactor assembly; the commercial power alternating current power supply output end is connected with the uninterrupted power supply input end; the commercial alternating current power supply is connected with the normally closed contact input end of the intermediate relay;
the switching circuit for solving the impact load further includes: the time relay is used for switching the power supply for maintaining the running of the grid-connected contactor coil from the mains supply to the uninterrupted power supply through the normally closed contact and the normally open contact after the load stably runs, and controlling the contact delay closing of the intermediate relay to avoid the impact of the impact current on the circuit;
the uninterrupted power supply output end is connected with the normally open contact input end of the intermediate relay; the normally closed contact output end of the intermediate relay is connected with a first normally open contact and a second normally open contact of the driving relay; the normally open contact output end of the intermediate relay is connected with a first normally open contact and a second normally open contact of the driving relay, and the normally open contact output end of the driving relay is connected with a coil of the grid-connected contactor assembly of the doubly-fed wind power converter;
the uninterrupted power supply output end is connected with the coil of the time relay through a third normally open contact of the driving relay to form a time relay coil control loop; the uninterrupted power supply output end is connected with the coil of the intermediate relay through the normally open contact of the time relay to form an intermediate relay coil control loop; the controller is connected with the driving relay.
2. The switching circuit for a doubly-fed wind power converter in accordance with claim 1 wherein said drive relay has at least three normally open contacts.
3. The switching circuit for solving the impact load of the doubly-fed wind power converter according to claim 1, wherein the intermediate relay is provided with at least two normally-closed contacts and two normally-open contacts and is provided with a forced guiding structure for ensuring that the load cannot lose electricity when the load works normally; the intermediate relay is controlled by the time relay to be closed in a delayed mode.
4. The switching circuit for solving the impact load of the doubly-fed wind power converter according to claim 1, wherein after the grid-connected contactor assembly of the doubly-fed wind power converter is powered off, the intermediate relay is powered off.
5. The switching circuit for solving the impact load of the doubly-fed wind power converter according to claim 1, wherein the doubly-fed wind power converter grid-connected contactor assembly is composed of one contactor or a plurality of contactors connected in parallel.
6. A doubly-fed wind power converter, characterized in that the doubly-fed wind power converter comprises a switching circuit for solving an impact load of the doubly-fed wind power converter according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320756704.6U CN219420368U (en) | 2023-04-07 | 2023-04-07 | Switching circuit for solving impact load of doubly-fed wind power converter and converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320756704.6U CN219420368U (en) | 2023-04-07 | 2023-04-07 | Switching circuit for solving impact load of doubly-fed wind power converter and converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219420368U true CN219420368U (en) | 2023-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320756704.6U Active CN219420368U (en) | 2023-04-07 | 2023-04-07 | Switching circuit for solving impact load of doubly-fed wind power converter and converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219420368U (en) |
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2023
- 2023-04-07 CN CN202320756704.6U patent/CN219420368U/en active Active
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