CN210927100U - Non-three-phase to three-phase power supply structure based on wood bridge connection line transformer - Google Patents
Non-three-phase to three-phase power supply structure based on wood bridge connection line transformer Download PDFInfo
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- CN210927100U CN210927100U CN201921919146.0U CN201921919146U CN210927100U CN 210927100 U CN210927100 U CN 210927100U CN 201921919146 U CN201921919146 U CN 201921919146U CN 210927100 U CN210927100 U CN 210927100U
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Abstract
The utility model discloses a non-three-phase to three-phase power supply structure based on a wood bridge connection line transformer, which comprises a power transmission line, a three-phase static var generator and a wood bridge connection line transformer; the three-phase port of the wood bridge wire transformer is used as an output end to provide three-phase power for users, and the input end of the wood bridge wire transformer is respectively connected with the three-phase static var generator and the power transmission line; and the input end of the three-phase static var generator is connected with the power transmission line. The utility model discloses can realize providing three phase current's function for the user through single-phase electric wire and double-phase power transmission line, extensively be applicable to distribution system transformation and trouble and salvage.
Description
Technical Field
The utility model relates to an electric power distribution technical field. In particular to a non-three-phase to three-phase power supply structure based on a wood bridge line transformer.
Background
In the ac power supply system of the power system, a three-phase ac power supply system is widely used. In the field of low-voltage power distribution in China, single-phase power transmission lines are generally erected to provide electric energy for users, users are geographically dispersed in partial regions, and a two-phase power transmission line mode is also adopted to provide electric energy for users. When a user who only accesses a single-phase or two-phase power transmission line needs to use a three-phase power supply, according to the prior art, only the three-phase power transmission line can be re-erected to provide the three-phase power supply for the user, and the method is long in time consumption, high in cost and low in economical efficiency.
Meanwhile, the transmission line is generally erected outdoors, so that the regional span is wide, the environmental conditions are variable, and various line breakage faults are generated due to the long-term mechanical force, the action of electromagnetic force, the thermal effect, serious oxidation, poor contact and the like, so that the equipment cannot normally operate. When the original three-phase transmission line has one or two-phase line break faults due to external reasons, the three-phase power supply mode is changed into a non-three-phase power supply mode, so that a three-phase power supply required by a user cannot be provided for the user. The existing solution can only provide a three-phase power supply in a short time through the economic rush repair of power maintenance personnel, and has great danger when the rescue is carried out in severe weather, so that the personal safety of the power maintenance personnel is difficult to ensure.
If the single-phase or two-phase power transmission line can be converted into a three-phase power supply mode through a simpler power equipment structure under the condition that the power quality of a power grid is allowed, a user can obtain a three-phase power supply at a lower cost in a shorter time, the cost input of a power transmission facility can be saved, the emergency supply of the three-phase power supply can be realized when the three-phase power transmission line is broken, the emergency maintenance of power maintenance personnel under the severe environment condition is avoided, and the personal safety of the power maintenance personnel is guaranteed.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a non-three-phase changes three-phase power supply structure based on wood bridge connector transformer has solved the technical problem that provides three phase current through single-phase or double-phase power transmission line, can realize under the condition that need not erect the power transmission line again, erect regional user for non-three phase power transmission line and provide the three phase current of symmetry, do and take place to provide three phase current under the condition of one phase or double-phase broken string at original three phase power transmission line promptly, the power transmission line of having avoided long distance to erect, reduce the potential safety hazard that power maintenance personnel salvageed and cause.
In order to solve the regional user of non-three phase transmission line, obtain three phase current's problem in short time because of the unable user that obtains three phase current's of three phase transmission line trouble on the basis that satisfies economic nature, security and ageing, the utility model discloses a technical scheme as follows:
the utility model provides a non-three-phase changes three-phase power supply structure based on wood bridge connector transformer, this structure is including being used for carrying out the power transmission line that supplies power to wood bridge connector transformer and three-phase static var generator, the three-phase static var generator who is used for changing the electric current through the reposition of redundant personnel in the power transmission line and supplies power to wood bridge connector transformer to and be used for carrying out vary voltage and phase modulation with the electric energy that power transmission line and three-phase static var generator provided and provide symmetrical three phase power's wood bridge connector transformer to the user;
the three-phase port of the wood bridge line transformer is used as an output port to provide symmetrical three-phase power for users, and the B terminal and the C terminal of the wood bridge line transformer are respectively connected with the M terminal and the N terminal of the output port of the three-phase static var generator.
Specifically, when the power transmission line is a single-phase power transmission line, the power transmission line is respectively connected with a P terminal in an input end of a three-phase static var generator and an A terminal in a Wonde bridge line transformer, an N terminal in the input end of the three-phase static var generator is grounded, and the star winding side of the Wonde bridge line transformer provides symmetrical three-phase power for a user.
Specifically, when the power transmission line is a two-phase power transmission line, the A-phase power transmission line L is selected from the power transmission linesAP terminal respectively connected into input end of three-phase static var generator and connected wood bridgeA-terminal in line transformer, B-phase transmission line L in said transmission lineBAnd the N terminal of the output end of the three-phase static var generator is connected, and the star winding side of the wood bridge connection line transformer provides a symmetrical three-phase power supply for users.
Preferably, the three-phase static var generator comprises six high-power transistors BG, a direct-current energy storage capacitor and a pulse modem; every two high-power transistors BG are connected in series with the collector of another high-power transistor BG through the emitter of one high-power transistor BG to form a group of high-power transistor groups; the three groups of high-power transistor groups are connected in parallel, the connection point of the emitter is a point e, the connection point of the collector is a point f, and a direct-current energy storage capacitor is connected between the point e and the point f; the control electrode of each high-power transistor BG is connected to a pulse width modem;
specifically, the input current of the three-phase static var generator is equal to one half of the input current of the transmission line, and the input voltage U between the B terminal and the C terminal of the wood bridge line transformerBInput voltage U between A terminal and C terminal of wood bridge line transformerAInput currents I of terminals B of the woodbridge line transformer 2 are equal in magnitude and 90 DEG in phase with each otherBEqual to input current I of three-phase static var generator2。
Further preferably, the high-power transistor can adopt an integrated gate commutated thyristor.
Further preferably, the high-power transistor can also adopt an insulated gate bipolar transistor.
Compared with the prior art, the utility model discloses the beneficial effect of technique is:
firstly, in the place where only a single-phase transmission line with a grounded neutral point is erected in a power distribution network, because a three-phase power supply is needed in an emergency and the time for erecting a new three-phase line is not allowed, under the condition that the electric energy quality of the power distribution network is allowed, the three-phase power supply can be provided through the power supply structure of the utility model;
secondly, in the place where only two-phase power transmission lines are erected in the power distribution network, because three-phase power is needed in an emergency and short time, the time for erecting a new three-phase line is not allowed, and under the condition that the power quality of the power distribution network is allowed, the three-phase power can be provided through the power supply structure of the utility model;
and thirdly, when one phase or two phases of the three-phase user are disconnected, and the maintenance environment is severe at that time, three-phase electric energy can be provided by the method, and the line is maintained after the weather environment is improved, so that potential safety hazards possibly existing in outdoor emergency repair of power maintenance personnel are reduced, and the possibility of larger accidents caused by emergency situations is also reduced.
Fourthly, the structure is simple, the universality is good, the economical efficiency is good, and the implementation is easy.
Drawings
Fig. 1 is a schematic diagram of a basic structure of the power supply structure according to the first embodiment of the present invention.
Fig. 2 is a connection diagram of a specific structure of the power supply structure according to the first embodiment of the present invention.
Fig. 3 is a schematic structural diagram of the three-phase static var generator according to the first embodiment of the present invention.
Fig. 4 is a connection diagram of a specific structure of the power supply structure according to the second embodiment of the present invention.
Reference numerals:
1-transmission line, LA-a phase transmission line, LB-B phase transmission line, 2-wood bridge line transformer, 3-three phase static var generator, BG-high power transistor, UA-input voltage between terminals A and C of the Woude bridge line transformer, UBInput voltage between the B and C terminals of the Wurd bridge line transformer, I-power line current, I1Input current at terminal A of a wood bridge line transformer, I2Input current to the P terminal of a three-phase static var generator, IB-input current to terminal B in wood bridge transformer 2.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The basic working principle of the power supply structure is as follows:
assuming that the current of the power transmission line 1 is I, the input current I of the A terminal of the wood bridge line transformer 21The input current of the three-phase static var generator is I2Input current of terminal B in the wood bridge line transformer 2 is IBThe input voltage between the A terminal and the C terminal of the wood bridge line transformer 2 is UAThe input voltage between the B terminal and the C terminal of the wood bridge line transformer 2 is UB(ii) a Input current I of terminal A in wood bridge line transformer 21Is half the current I of the transmission line 1; input voltage U in wood bridge line transformer 2BAnd an input voltage UAEqual in magnitude and phase with UAInput current I of terminal B in woodbridge line transformer 2 at 90 DEGBEqual to the input current I of the P terminal in the three-phase static var generator 32(ii) a The star winding side of the wood bridge transformer 2 is used for the operation of loads requiring three-phase power by providing a symmetrical three-phase power supply.
Example one
As shown in fig. 1, the embodiment of the present invention provides a non-three-phase to three-phase power supply structure based on a wood bridge line transformer, and the power supply structure mainly includes a power transmission line 1, a wood bridge line transformer 2, and a three-phase static var generator 3. The power transmission line 1 is used for carrying out current transmission on a wood bridge line transformer 2 and a three-phase static var generator 3; the wood bridge line transformer 2 is used for transforming and phase-modulating the current provided by the power transmission line 1 and the three-phase static var generator 3 and then providing a symmetrical three-phase power supply for a user; the three-phase static var generator 3 is used for converting the shunted current in the power transmission line 1 and supplying power to the wood bridge connection line transformer 2; the power transmission line 1 is respectively connected with a three-phase static var generator 3 and a wood bridge line transformer 2, the three-phase static var generator 3 is connected with the wood bridge line transformer 2, and the wood bridge line transformer 2 provides three-phase power for users.
As shown in fig. 2 and 3, the 220V transmission line 1 of the neutral-grounded power grid is a single-phase transmission line and the current flowsTo I, the power transmission line 1 is respectively connected to an A terminal in a wood bridge line transformer 2 and a P terminal of a three-phase static var generator 3; the current magnitude of the A terminal of the power transmission line 1 input wood bridge line transformer 2 is I1The magnitude of the current input to the P terminal of the three-phase static var generator 3 is I2(ii) a The B terminal and the C terminal of the wood bridge connection line transformer 2 are respectively connected with the M terminal and the N terminal of the three-phase static var generator 3, wherein the N terminal is grounded; the three-phase static var generator 3 comprises six high-power transistors BG, a direct-current energy storage capacitor and a pulse modem; every two high-power transistors BG are connected in series with the collector of another high-power transistor BG through the emitter of one high-power transistor BG to form a group of high-power transistor groups; the three groups of high-power transistor groups are connected in parallel in the forward direction, the connection point of the emitter is a point e, the connection point of the collector is a point f, and a direct-current energy storage capacitor is connected between the point e and the point f; the control electrode of each high-power transistor BG is connected to a pulse width modem; the sides a, b, c of the wye winding of the wood bridge transformer 2 provide three-phase symmetric power to the user.
Wherein the input current I of the three-phase static var generator 32Is a transmission line LAIs one half of the current I of (a); input voltage U in wood bridge line transformer 2BInput voltage U in Wudet bridge line transformer 2AInput currents I of terminals B of the woodbridge line transformer 2 are equal in magnitude and 90 DEG in phase with each otherBEqual to the input current I of the P terminal in the three-phase static var generator 32。
The embodiment of the utility model provides a high-power transistor BG is an integrated gate commutated thyristor IGCT; in practical implementation, an insulated gate bipolar transistor IGBT may also be used.
Example two
The embodiment of the utility model provides a non-three-phase changes three-phase power supply structure based on wood bridge connector transformer with above-mentioned the utility model provides a basic structure is the same, as shown in figure 1 promptly, this power supply structure mainly includes power transmission line 1, wood bridge connector transformer 2 and three-phase static var generator 3. The power transmission line 1 is used for carrying out current transmission on a wood bridge line transformer 2 and a three-phase static var generator 3; the wood bridge line transformer 2 is used for transforming and phase-modulating the current provided by the power transmission line 1 and the three-phase static var generator 3 and then providing a symmetrical three-phase power supply for a user; the three-phase static var generator 3 is used for converting the shunted current in the power transmission line 1 and supplying power to the wood bridge connection line transformer 2; the power transmission line 1 is respectively connected with a three-phase static var generator 3 and a wood bridge line transformer 2, the three-phase static var generator 3 is connected with the wood bridge line transformer 2, and the wood bridge line transformer 2 provides three-phase power for users.
The embodiment of the utility model provides an in six high-power transistor BG, direct current energy storage electric capacity and pulse width modem's among the three-phase static var generator 3 structure and mutual connected mode and above-mentioned utility model embodiment one in as shown in fig. 3 the structure identical, this no longer gives unnecessary details.
In the embodiment of the utility model, the high-power transistor BG is an integrated gate commutated thyristor IGCT; in practical implementation, the high-power transistor BG may also adopt an insulated gate bipolar transistor IGBT.
With reference to fig. 2 and 4, the non-three-phase to three-phase power supply structure based on the wood bridge line transformer according to the embodiment of the present invention is different from the first embodiment of the present invention in that the power transmission line 1 according to the embodiment of the present invention is a two-phase power transmission line; l in two-phase transmission linesA、LBThe voltage between the two lines is 220V, the input current in the power transmission line 1 is I, and the A-phase power transmission line L in the power transmission line 1ARespectively connected to the A terminal of the wood bridge line transformer 2 and the P terminal of the three-phase static var generator 3, an A-phase transmission line LAThe current magnitude of the A terminal of the input wood bridge line transformer 2 is I1A phase transmission line LAThe current input to the P terminal of the three-phase static var generator 3 is I2(ii) a B-phase transmission line L in transmission line 1BThe N terminal of the three-phase static var generator 3 is accessed; three-phase static var generationThe M terminal and the N terminal of the device 3 are connected to the B terminal and the C terminal of the wood bridge connection transformer 2, respectively; the sides a, b, c of the wye winding of the wood bridge transformer 2 provide three-phase symmetric power to the user.
Wherein the input current I of the three-phase static var generator 32Is a transmission line LAIs one half of the current I of (a); input voltage U in wood bridge line transformer 2BInput voltage U in Wudet bridge line transformer 2AInput currents I of terminals B of the woodbridge line transformer 2 are equal in magnitude and 90 DEG in phase with each otherBEqual to the input current I of the P terminal in the three-phase static var generator 32。
The embodiment of the utility model provides a high-power transistor BG is an integrated gate commutated thyristor IGCT; in practical implementation, an insulated gate bipolar transistor IGBT may also be used.
Claims (8)
1. Non three-phase changes three-phase power supply structure based on wood bridge line transformer, characterized by that, this power supply structure includes:
a power transmission line (1) for supplying power to a wood bridge line transformer (2) and a three-phase static var generator (3);
the wood bridge line transformer (2) is used for transforming and phase-modulating the current provided by the power transmission line (1) and the three-phase static var generator (3) and providing a symmetrical three-phase power supply for a user;
the three-phase static var generator (3) is used for converting the shunted current in the power transmission line (1) and supplying power to the wood bridge connection line transformer (2);
the three-phase port of the wood bridge line transformer (2) serves as an output end to provide three-phase power for a user, and the input end of the wood bridge line transformer (2) is connected with the three-phase static var generator (3) and the power transmission line (1) respectively; the input end of the three-phase static var generator (3) is connected with the power transmission line (1).
2. The woodbridge transformer-based non-three-phase to three-phase power supply structure according to claim 1, wherein the woodbridge transformer (2) has terminals B and C connected to terminals M and N of the output ports of the three-phase static var generator (3), respectively.
3. The non-three-phase to three-phase power supply structure based on the woodbridge transformer according to claim 2, characterized in that the power transmission line (1) is a single-phase power transmission line, the power transmission line (1) is connected to the A terminal of the woodbridge transformer (2) and the P terminal of the three-phase static var generator (3), respectively, and the N terminal of the input end of the three-phase static var generator (3) is grounded.
4. The woodbridge transformer-based non-three-to-three-phase power supply configuration according to claim 2, wherein the power transmission line (1) is a two-phase power transmission line, and wherein the a-phase power transmission line (L) of the power transmission line (1) is a two-phase power transmission lineA) A terminal of a wood bridge line transformer (2) and a P terminal of a three-phase static var generator (3) are respectively connected, and a B-phase power transmission line (L) in the power transmission line (1)B) And the N terminal of the three-phase static var generator (3) is connected.
5. The woodbridge transformer-based non-three-phase to three-phase power supply configuration according to claim 3 or 4, wherein the three-phase static var generator (3) comprises six high-power transistors (BG), a DC energy storage capacitor and a pulse modem; every two high-power transistors (BG) are connected in series through the emitter of one high-power transistor (BG) and the collector of the other high-power transistor (BG) to form a group of high-power transistor groups; the series points of the emitting electrodes and the collecting electrodes in the three groups of high-power transistor groups form the external P terminal, M terminal and N terminal of the three-phase static var generator; three groups of high-power transistor groups are connected in parallel in the forward direction, the connection point of an emitter is a point e, the connection point of a collector is a point f, and a direct-current energy storage capacitor is connected between the point e and the point f; the control electrode of each high-power transistor (BG) is connected to a pulse width modem.
6. The Wude bridge transformer-based non-three-phase to three-phase power supply structure of claim 5, wherein the Wude bridge transformer-based non-three-phase to three-phase power supply structureInput current I of a three-phase static var generator (3)2For A-phase transmission lines (L) in the transmission line (1)A) Is one half of the current I of (a); input voltage U between terminals B and C in wood bridge line transformer (2)BInput voltage U between A terminal and C terminal of wood bridge line transformer (2)AEqual in magnitude and 90 ° in phase with each other; input current I of terminal B in wood bridge line transformer (2)BEqual to the input current I of the three-phase static var generator (3)2。
7. The wurtbridge transformer-based non-three-to-three phase power supply configuration according to claim 6, wherein the high power transistors (BG) are integrated gate commutated thyristors.
8. The wurtbridge transformer-based non-three-to-three phase power supply configuration according to claim 6, wherein the high power transistor (BG) is an igbt.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921919146.0U CN210927100U (en) | 2019-11-08 | 2019-11-08 | Non-three-phase to three-phase power supply structure based on wood bridge connection line transformer |
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| CN201921919146.0U CN210927100U (en) | 2019-11-08 | 2019-11-08 | Non-three-phase to three-phase power supply structure based on wood bridge connection line transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110649612A (en) * | 2019-11-08 | 2020-01-03 | 成都尚华电气有限公司 | Non-three-phase to three-phase power supply structure based on wood bridge connection line transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110649612A (en) * | 2019-11-08 | 2020-01-03 | 成都尚华电气有限公司 | Non-three-phase to three-phase power supply structure based on wood bridge connection line transformer |
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