CN210839324U - Pre-charging device for high-voltage converter - Google Patents
Pre-charging device for high-voltage converter Download PDFInfo
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- CN210839324U CN210839324U CN201921809124.9U CN201921809124U CN210839324U CN 210839324 U CN210839324 U CN 210839324U CN 201921809124 U CN201921809124 U CN 201921809124U CN 210839324 U CN210839324 U CN 210839324U
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Abstract
The utility model discloses a pre-charging device for a high-voltage converter, which comprises a three-phase main contactor, a high-voltage converter and a pre-charging circuit, wherein the pre-charging circuit comprises a three-phase alternating-current low-voltage power supply, a three-phase incoming line breaker, a three-phase pre-charging contactor, a step-up transformer and a rectifying circuit; the utility model selects the low-voltage contactor as the pre-charging contactor, so that the cost is greatly reduced; the input is connected with a low-voltage power supply, the output is connected with high, low and middle potentials of a direct-current bus capacitor, other electrical connections are avoided, and the installation and maintenance are convenient; the pre-charging circuit is directly connected with the direct current bus capacitor, so that impact current to a switching tube of the main circuit is avoided, the main circuit is not damaged, and the working reliability of the high-voltage converter is greatly improved; the secondary side voltage of the booster transformer is half of the voltage of the main loop, the design scheme is easy to realize, and the cost is low.
Description
Technical Field
The utility model relates to a power electronic technology field, concretely relates to precharge device for high voltage converter.
Background
In the initial power-on state of the converter, the voltage at two ends of the bus capacitor is zero volt, and the impedance of the bus capacitor is equivalent to zero ohm on the power supply side, so that in the power-on process, large impact current can be generated, and the switch tube and the bus capacitor of the converter are damaged, so that a pre-charging device needs to be added into a main loop of the converter to limit the impact current and protect the switch tube and the bus capacitor of the converter.
As shown in fig. 1, in a conventional precharging device, a precharging resistor and a precharging contactor are arranged on an ac input side, the precharging contactor is firstly attracted when a converter is powered on, a three-phase ac power supply firstly charges a bus capacitor through the precharging contactor, a soft start resistor and a rectification module, and when the voltage at two ends of the bus capacitor reaches a designed voltage, a main contactor is attracted and the precharging contactor is disconnected. But has the following disadvantages: for a high-voltage converter, a high-voltage contactor needs to be selected as a pre-charging contactor, so that the cost is high; the structure of the pre-charging device is complex, the electric wiring is more, and the installation and maintenance are complicated; the pre-charging resistor has large power consumption and is easy to damage.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a precharge device for high voltage converter to solve the problem that exists among the above-mentioned prior art.
In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides a pre-charge device for high voltage converter, includes three-phase main contactor, high voltage converter, pre-charge circuit, and three-phase main contactor input connects three-phase high voltage power supply, and three-phase main contactor output connects the AC input of high voltage converter, pre-charge circuit includes three-phase AC low voltage power supply, three-phase inlet wire circuit breaker, three-phase pre-charge contactor are connected gradually to three-phase AC low voltage power supply, three-phase pre-charge contactor with step up transformer's primary side links to each other, step up transformer's secondary side's A phase winding, B phase winding respectively with rectifier circuit's AC input side links to each other, step up transformer's secondary side's C phase winding with high voltage converter's direct current bus electric capacity intermediate potential links to each other, rectifier circuit's direct current output side's one end through series connection pre-charge And the other end of the direct current output side of the diode rectifier bridge is connected with the low potential of the direct current bus capacitor of the high-voltage converter through a series pre-charging second resistor.
Further, the three-phase pre-charging contactor is a low-voltage contactor.
Further, the rectifying circuit is a diode rectifier bridge circuit.
Further, the main contactor is a high-voltage vacuum contactor.
The utility model has the advantages that: the utility model selects the low-voltage contactor as the pre-charging contactor, so that the cost is greatly reduced; the input is connected with a low-voltage power supply, the output is connected with a high-potential DC +, a low-potential DC-and a middle potential N of a direct-current bus capacitor, no other electrical connection is needed, and the installation and maintenance are convenient; the pre-charging circuit is directly connected with the direct current bus capacitor, so that impact current to a switching tube of the main circuit is avoided, the main circuit is not damaged, and the working reliability of the high-voltage converter is greatly improved; the secondary side voltage of the booster transformer is half of the voltage of the main loop, so that the direct-current voltage charging requirement can be met, the design scheme is easy to realize, and the cost is low.
Drawings
FIG. 1 is a schematic diagram of a pre-charging device according to the prior art;
fig. 2 is a schematic structural diagram of a precharge device for a high-voltage converter according to the present invention.
In the figure: 1. a rectifying circuit; 2. a high voltage converter; 3. a precharge circuit; u, three-phase AC low-voltage power supply; q, a three-phase incoming line breaker; KM1, three-phase pre-charging contactor; t, a step-up transformer; r1, precharge first resistance; r2, precharge second resistance; KM2, three-phase main contactor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 2, a pre-charging device for a high-voltage converter comprises a three-phase main contactor KM2, a high-voltage converter 2 and a pre-charging circuit 3, wherein the input of the three-phase main contactor KM2 is connected with a three-phase high-voltage power supply, the output of the three-phase main contactor KM2 is connected with the alternating current input of the high-voltage converter 2, the pre-charging circuit 3 comprises a three-phase alternating current low-voltage power supply U, a three-phase incoming line breaker Q, a three-phase pre-charging contactor KM1, a step-up transformer T and a rectifying circuit 1, the three-phase alternating current low-voltage power supply U is sequentially connected with the three-phase incoming line breaker Q and the three-phase pre-charging contactor KM1, the three-phase pre-charging contactor KM1 is connected with the primary side of the step-up transformer T, the phase a winding and the phase winding on the secondary side of the step-up, one end of the direct current output side of the rectifying circuit 1 is connected with a direct current bus capacitor high-potential DC + of the high-voltage converter 2 through a series pre-charging first resistor R1, and the other end of the direct current output side of the diode rectifying bridge is connected with a direct current bus capacitor low-potential DC-of the high-voltage converter 2 through a series pre-charging second resistor R2.
The main circuit of the high-voltage converter adopts a high-voltage vacuum three-phase main contactor KM2 to access a R, S, T three-phase high-voltage power supply, so that arc discharge can be prevented, the output of the three-phase main contactor KM2 is connected with the alternating current input of the high-voltage converter, and the A phase, the B phase and the C phase of a three-phase alternating current low-voltage power supply U are connected with a common 3AC 380V low-voltage power supply; the method comprises the following steps that a three-phase incoming line breaker Q is closed, a high-voltage converter 2 control system sends an attraction control signal of a three-phase pre-charging contactor KM1, the three-phase pre-charging contactor KM1 attracts, a 3AC 380V low-voltage power supply is boosted to a design voltage through a booster transformer T, a direct-current bus capacitor DC + and DC-are charged through a pre-charging first resistor R1 and a pre-charging second resistor R2 after being rectified by a rectifying circuit 1, when the voltage of the direct-current bus capacitor reaches a design value, the high-voltage converter control system detects that the voltage of a direct-current bus meets requirements, a three-phase pre-charging contactor KM1 disconnection signal is sent, the pre; and a suction signal of the three-phase main contactor KM2 is sent out, the three-phase main contactor KM2 is sucked, and the high-voltage converter is normally put into use.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A pre-charging device for a high-voltage converter comprises a three-phase main contactor (KM 2), the high-voltage converter (2) and a pre-charging circuit (3), wherein the input of the three-phase main contactor (KM 2) is connected with a three-phase high-voltage power supply, the output of the three-phase main contactor (KM 2) is connected with the alternating current input of the high-voltage converter (2), and the pre-charging device is characterized in that: the pre-charging circuit (3) comprises a three-phase alternating current low-voltage power supply (U), a three-phase incoming line breaker (Q), a three-phase pre-charging contactor (KM 1), a step-up transformer (T) and a rectifying circuit (1), wherein the three-phase alternating current low-voltage power supply (U) is sequentially connected with the three-phase incoming line breaker (Q) and the three-phase pre-charging contactor (KM 1), the three-phase pre-charging contactor (KM 1) is connected with the primary side of the step-up transformer (T), an A-phase winding and a B-phase winding on the secondary side of the step-up transformer (T) are respectively connected with the alternating current input side of the rectifying circuit (1), a C-phase winding on the secondary side of the step-up transformer (T) is connected with the direct current bus capacitor intermediate potential (N) of the high-voltage converter (2), one end of the direct current output side of the rectifying circuit (1) is connected with the direct current capacitor high-potential (DC, the other end of the direct current output side of the rectifying circuit (1) is connected with a low potential (DC-) of a direct current bus capacitor of the high-voltage converter (2) through a series pre-charging second resistor (R2).
2. A pre-charging apparatus for a high voltage converter according to claim 1, wherein: the three-phase pre-charging contactor (KM 1) is a low-voltage contactor.
3. A pre-charging apparatus for a high voltage converter according to claim 1, wherein: the rectifying circuit (1) is a diode rectifying bridge circuit.
4. A pre-charging apparatus for a high voltage converter according to claim 1, wherein: the main contactor (KM 2) is a high-voltage vacuum contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921809124.9U CN210839324U (en) | 2019-10-25 | 2019-10-25 | Pre-charging device for high-voltage converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921809124.9U CN210839324U (en) | 2019-10-25 | 2019-10-25 | Pre-charging device for high-voltage converter |
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| Publication Number | Publication Date |
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| CN210839324U true CN210839324U (en) | 2020-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921809124.9U Active CN210839324U (en) | 2019-10-25 | 2019-10-25 | Pre-charging device for high-voltage converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113411001A (en) * | 2021-07-05 | 2021-09-17 | 阳光电源股份有限公司 | Hydrogen production power supply system, hydrogen production device and hydrogen production method |
-
2019
- 2019-10-25 CN CN201921809124.9U patent/CN210839324U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113411001A (en) * | 2021-07-05 | 2021-09-17 | 阳光电源股份有限公司 | Hydrogen production power supply system, hydrogen production device and hydrogen production method |
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