CN220964650U - Converter pre-charging device - Google Patents
Converter pre-charging device Download PDFInfo
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- CN220964650U CN220964650U CN202322393576.6U CN202322393576U CN220964650U CN 220964650 U CN220964650 U CN 220964650U CN 202322393576 U CN202322393576 U CN 202322393576U CN 220964650 U CN220964650 U CN 220964650U
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- 239000003990 capacitor Substances 0.000 claims abstract description 27
- 238000010586 diagram Methods 0.000 description 4
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- 238000010248 power generation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a pre-charging device of a converter, which comprises a network side switch, a network side converter, a direct current capacitor, a machine side converter, a machine side switch and a pre-charging circuit, wherein the network side switch is connected with the direct current capacitor; the direct-current capacitor is connected between the direct-current end of the network side converter and the direct-current end of the machine side converter in parallel, the alternating-current end of the machine side converter is connected with one end of the machine side switch, and the other end of the machine side switch is connected with the generator port; one end of the pre-charging circuit is connected with a power grid port, and the other end of the pre-charging circuit is connected with the side converter alternating current port; the pre-charging device of the converter can achieve the purpose of pre-charging of the converter only by using the contactor and the resistor, and is simple in circuit structure and low in cost.
Description
Technical Field
The utility model relates to the technical field of power generation and power distribution, in particular to a pre-charging device of a converter.
Background
In order to stabilize the dc voltage, the dc link of the power electronic converter is typically configured with a dc bus capacitor. Because the direct current bus capacitor and the direct current closed switch can generate larger impact current when being charged, the direct current capacitor and other devices of the main loop are damaged. In order to reduce the impact current in the charging process of the direct current bus capacitor, the direct current bus capacitor is usually required to be precharged through a resistor or a controllable thyristor in the initial stage of starting, which is also called soft start, and is switched into a main loop after the precharge is finished.
The prior art has a net side converter ac side precharge and a dc side precharge scheme through a rectifier bridge.
Both of these schemes have their drawbacks:
(1) When the capacitance value of the alternating current filter capacitor is larger, the resistor power consumption is larger, and the charging voltage value can be divided by the alternating current capacitor so as to reduce the charging target value;
(2) The dc-side pre-charging scheme through the rectifier bridge is often difficult or costly to select a rectifier diode of the appropriate voltage class when the grid voltage is high.
Disclosure of utility model
The technical problem to be solved by the utility model is to provide the pre-charging device for the converter, which can realize the pre-charging purpose of the converter only by using the contactor and the resistor, and has the advantages of simple circuit structure and low cost.
In order to solve the technical problems, the utility model provides a pre-charging device of a converter, which comprises a network side switch, a network side converter, a direct current capacitor, a machine side converter, a machine side switch and a pre-charging circuit;
The direct-current capacitor is connected between the direct-current end of the network side converter and the direct-current end of the machine side converter in parallel, the alternating-current end of the machine side converter is connected with one end of the machine side switch, and the other end of the machine side switch is connected with the generator port;
One end of the pre-charging circuit is connected with a power grid port, and the other end of the pre-charging circuit is connected with the side converter alternating current port.
Preferably, the precharge circuit comprises a precharge protection device, a precharge resistor, and a precharge contactor; one end of the precharge protection device is connected with the power grid port, the other end of the precharge protection device is connected with one end of the precharge resistor, the other end of the precharge resistor is connected with one end of the precharge contactor, and the other end of the precharge contactor is connected with the alternating-current end of the machine side converter.
Preferably, the pre-charging resistor is used for limiting the charging current of the direct-current capacitor, and the pre-charging contactor is used for controlling the connection and disconnection of the pre-charging loop.
Preferably, the side switch is used for grid-connected control of the converter and the generator.
Preferably, the protection device in the precharge circuit is a fuse or an air switch.
After the device is adopted, the converter pre-charging device comprises a grid-side switch, a grid-side converter, a direct-current capacitor, a machine-side converter, a machine-side switch and a pre-charging circuit; the direct-current capacitor is connected between the direct-current end of the network side converter and the direct-current end of the machine side converter in parallel, the alternating-current end of the machine side converter is connected with one end of the machine side switch, and the other end of the machine side switch is connected with the generator port; one end of the pre-charging circuit is connected with a power grid port, and the other end of the pre-charging circuit is connected with the side converter alternating current port; the pre-charging device of the converter can achieve the purpose of pre-charging of the converter only by using the contactor and the resistor, and is simple in circuit structure and low in cost.
Drawings
FIG. 1 is a circuit diagram of prior art alternating current side precharge through a grid side inverter;
FIG. 2 is a circuit diagram of a prior art direct current side precharge through a rectifier bridge;
FIG. 3 is a circuit diagram of a current transformer precharge device of the present utility model;
FIG. 4 is a flowchart illustrating an implementation of the pre-charging device of the current transformer according to the present utility model;
Fig. 5 is a flowchart showing an implementation of the current transformer precharge apparatus according to the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Example 1
Referring to fig. 3, fig. 3 is a circuit diagram of a pre-charging device of a current transformer according to the present utility model;
The embodiment discloses a pre-charging device of a converter, which comprises a network side switch 2, a network side converter 3, a direct current capacitor 4, a machine side converter 5, a machine side switch 6 and a pre-charging circuit 10;
One end of the network side switch 2 is connected with the power grid port 1, the other end of the network side switch 2 is connected with the alternating current end of the network side converter 3, the direct current end of the network side converter 3 is connected with the direct current end of the machine side converter 5, the direct current capacitor 4 is connected between the direct current end of the network side converter 3 and the direct current end of the machine side converter 5 in parallel, the alternating current end of the machine side converter 5 is connected with one end of the machine side switch 6, and the other end of the machine side switch 6 is connected with the generator port 7;
One end of the precharge circuit 10 is connected with a power grid port, and the other end of the precharge circuit 10 is connected with an alternating current port of the side converter 5.
Example two
Referring to fig. 4 and 5, fig. 4 is a first execution flow chart of the current transformer pre-charging device of the present utility model, and fig. 5 is a second execution flow chart of the current transformer pre-charging device of the present utility model;
The present embodiment is based on the first embodiment, in which the precharge circuit 10 includes a precharge protection device 12, a precharge resistor 11, and a precharge contactor 13; one end of a precharge protection device 12 is connected with the power grid port 1, the other end of the precharge protection device 12 is connected with one end of the precharge resistor 11, the other end of the precharge resistor 11 is connected with one end of the precharge contactor 13, and the other end of the precharge contactor 13 is connected with the alternating current end of the machine side converter 5.
In this embodiment, the working execution flow of the current transformer precharge device is as follows:
detecting the state of the machine side switch 6 after the system receives a start command, and reporting that the machine side switch is not disconnected when the machine side switch 6 is closed;
when the detector side switch 6 is in an open state, the precharge contactor 13 is closed;
after the precharge contactor 13 is closed, detecting whether the voltage of the direct-current capacitor 4 reaches a set value;
when the voltage of the direct-current capacitor 4 reaches a set value, the precharge contactor 13 is opened, the network side switch 2 is closed, and precharge is completed;
when the voltage of the direct-current capacitor 4 is detected to be not up to a set value in a certain time, a fault stop is reported;
Or the working execution flow of the converter pre-charging device is as follows:
detecting the state of the machine side switch 6 in real time after the system is stopped, and reporting that the machine side switch 6 is not disconnected when the state of the machine side switch 6 is closed;
When the state of the detector side switch 6 is off, setting is ready for starting;
detecting a start-up command, and closing the precharge contactor 13 after receiving the system start-up command;
after the precharge contactor 13 is closed, detecting whether the voltage of the direct current capacitor 4 reaches a set value;
when the voltage of the direct-current capacitor 4 reaches a set value, the precharge contactor 13 is opened, the network side switch 2 is closed, and precharge is completed;
and when the voltage of the direct-current capacitor 4 is detected to be not up to the set value within a certain time, a fault stop is reported.
Example III
This embodiment is based on the second embodiment, which, in this embodiment,
The pre-charging resistor 11 is used for limiting the charging current of the direct-current capacitor 4, and the pre-charging contactor 13 is used for controlling the connection and disconnection of the pre-charging loop 10;
the machine side switch 6 is used for grid connection control of the converter and the generator.
Example IV
This embodiment is based on the second embodiment, which, in this embodiment,
The precharge protection device 12 is a fuse or an air switch.
The pre-charging device of the converter can achieve the purpose of pre-charging of the converter only by using the contactor and the resistor, and is simple in circuit structure and low in cost.
The preferred embodiments of the present application have been described above with reference to the accompanying drawings, and thus do not limit 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 appended claims.
Claims (5)
1. The pre-charging device for the converter is characterized by comprising a grid-side switch, a grid-side converter, a direct-current capacitor, a machine-side converter, a machine-side switch and a pre-charging circuit;
The direct-current capacitor is connected between the direct-current end of the network side converter and the direct-current end of the machine side converter in parallel, the alternating-current end of the machine side converter is connected with one end of the machine side switch, and the other end of the machine side switch is connected with the generator port;
One end of the pre-charging circuit is connected with a power grid port, and the other end of the pre-charging circuit is connected with the side converter alternating current port.
2. The current transformer precharge device according to claim 1, wherein,
The precharge circuit comprises a precharge protection device, a precharge resistor and a precharge contactor; one end of the precharge protection device is connected with the power grid port, the other end of the precharge protection device is connected with one end of the precharge resistor, the other end of the precharge resistor is connected with one end of the precharge contactor, and the other end of the precharge contactor is connected with the alternating-current end of the machine side converter.
3. The current transformer precharge device according to claim 2, wherein the precharge resistor is configured to limit a dc capacitor charging current, and the precharge contactor is configured to control on and off of a precharge circuit.
4. The converter pre-charging device according to claim 1, wherein the side switch is used for grid-connected control of the converter and the generator.
5. The current transformer precharge device according to claim 2, wherein the precharge protection device is a fuse or an air switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322393576.6U CN220964650U (en) | 2023-09-04 | 2023-09-04 | Converter pre-charging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322393576.6U CN220964650U (en) | 2023-09-04 | 2023-09-04 | Converter pre-charging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220964650U true CN220964650U (en) | 2024-05-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322393576.6U Active CN220964650U (en) | 2023-09-04 | 2023-09-04 | Converter pre-charging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220964650U (en) |
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2023
- 2023-09-04 CN CN202322393576.6U patent/CN220964650U/en active Active
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