CN210744743U - Three-phase power supply structure of single three-phase combined transformer - Google Patents
Three-phase power supply structure of single three-phase combined transformer Download PDFInfo
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- CN210744743U CN210744743U CN201921919147.5U CN201921919147U CN210744743U CN 210744743 U CN210744743 U CN 210744743U CN 201921919147 U CN201921919147 U CN 201921919147U CN 210744743 U CN210744743 U CN 210744743U
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Abstract
The utility model discloses a single three-phase combination formula transformer three-phase power supply structure relates to electric power electric wire netting power supply and distribution technical field. The power transmission line is respectively connected with the single three-phase combined transformer and the three-phase static var generator; the single-three-phase combined transformer comprises a single-phase transformer T1 and a three-phase transformer T2, wherein a u terminal in an output port of the single-phase transformer T1 is connected with a b-phase line on the three-phase output side of the three-phase transformer T2, and a v terminal in an output port of the single-phase transformer T1 is connected with a c-phase line on the three-phase output side of the three-phase transformer T2; the B terminal and the C terminal of the input end of the three-phase transformer T2 are respectively connected with the M terminal and the N terminal of the output end of the three-phase static var generator, and the N terminal of the three-phase static var generator is connected with the K terminal of the single-phase transformer T1; and the a, b and c three-phase ports of the single three-phase combined transformer are used as output ports to provide three-phase power.
Description
Technical Field
The utility model relates to an electric power electric wire netting power supply and distribution technical field.
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
The utility model aims at providing a single three-phase combination formula transformer three-phase power supply structure, it can solve single-phase or double-phase power transmission line effectively and provide three phase power's technical problem.
The purpose of the utility model is realized through the following technical scheme: a single three-phase combined transformer three-phase power supply configuration, the power supply configuration comprising: the power transmission line is respectively connected with the single three-phase combined transformer and the three-phase static var generator; the single-three-phase combined transformer comprises a single-phase transformer T1 and a three-phase transformer T2, wherein a u terminal in an output port of the single-phase transformer T1 is connected with a b-phase line on the three-phase output side of the three-phase transformer T2, and a v terminal in an output port of the single-phase transformer T1 is connected with a c-phase line on the three-phase output side of the three-phase transformer T2; the B terminal and the C terminal of the input end of the three-phase transformer T2 are respectively connected with the M terminal and the N terminal of the output end of the three-phase static var generator, and the N terminal of the three-phase static var generator is connected with the K terminal of the single-phase transformer T1; and the a, b and c three-phase ports of the single three-phase combined transformer are used as output ports to provide three-phase power for users.
When the power transmission line is a single-phase power transmission line, the power transmission line is respectively connected with an A terminal in the primary side input end of the single three-phase combined transformer and a P terminal in the output end of the three-phase static var generator; and the N terminal in the three-phase static var generator is grounded.
When the power transmission line is a two-phase power transmission line, the A-phase power transmission line L in the power transmission lineAThe three-phase static var generator is respectively connected with an A terminal in the primary side input end of the single three-phase combined transformer and a P terminal in the output end of the three-phase static var generator; n terminal in input port of three-phase static var generator and B-phase transmission line L in transmission lineBAre connected.
The three-phase static var generator comprises six high-power transistors BG, a direct-current energy storage capacitor and a pulse width modulator CP; 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 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, the connection point of an emitting electrode is a point e, the connection point of a collecting electrode is a point f, and a direct-current energy storage capacitor is connected between the point e and the point f in parallel; the control stage of each high-power transistor BG is connected with the output end of the pulse width modulator CP.
Input current I of three-phase static var generator2Is half of the current I of the transmission line; input voltage U in three-phase transformer T2BAnd the input voltage U in the single-phase transformer T1AEqual in magnitude and 90 degrees in phase to each other; input current I of B terminal in single three-phase combined transformerBEqual to input current I of three-phase static var generator2。
The high-power transistor BG adopts an integrated gate commutated thyristor or 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 view of the basic structure of the present invention.
Fig. 2 is a connection diagram of the specific structure of the present invention.
Fig. 3 is a schematic structural diagram of the three-phase static var generator of the present invention.
Fig. 4 is a connection diagram of a specific structure of the second embodiment of the present invention.
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: the pulse width modulator CP (pulse width modulator) is adopted, the analog control mode is carried out on the analog circuit by utilizing the digital output of the microprocessor, the pulse width modulator can modulate the bias of a transistor base electrode or an MOS tube grid electrode according to the change of corresponding load, the change of the conduction time of the transistor or the MOS tube is realized, and the change of the output of the switching stabilized voltage power supply is realized. Let the current of the transmission line 1 be I, the input current I of the A terminal in the single three-phase combined transformer 21Input current I of terminal B in single-three phase combined transformer 2BThe P terminal input current of the three-phase static var generator 3 is I2The input voltage between the A terminal and the K terminal in the single three-phase combined transformer 2 is UAAnd the input voltage between the B terminal and the C terminal in the single three-phase combined transformer 2 is UB(ii) a Control of the input current I to the P terminal in the three-phase SVG 3 by means of the pulse width modulator CP2For A phase transmission line LAIs one half of the current I, the input current I of the B terminal in the single three-phase combined transformer 2BInput current I to P terminal of three-phase static var generator 32Equal in size; input voltage U between B terminal and C terminal of three-phase transformerBAnd the terminal A and the terminal K of the single-phase transformerInput voltage U between the sub-unitsAEqual in size and 90 degrees in phase with each other, the three-phase side of the single three-phase combined transformer 2 is operated by providing a symmetrical three-phase power supply for a load requiring three-phase power.
Example one
As shown in fig. 1, the embodiment of the present invention provides a three-phase power supply structure of a single three-phase combined transformer, which includes a power transmission line 1, a single three-phase combined transformer 2 and a three-phase static var generator 3. The power transmission line 1 is used for carrying out current transmission on the single three-phase combined transformer 2 and the three-phase static var generator 3; the single-three phase combined transformer 2 is formed by connecting a single-phase transformer T1 and a three-phase transformer T2, and 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 users; 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 single three-phase combined transformer 2; the power transmission line 1 is respectively connected with a three-phase static var generator 3 and a single three-phase combined transformer 2, the three-phase static var generator 3 is connected with the single three-phase combined transformer 2, and the three-phase side of the single three-phase combined transformer 2 provides three-phase power for users.
As shown in fig. 2 and fig. 3, the 220V transmission line 1 of the neutral point grounding grid is a single-phase transmission line and the current is I, and the transmission line 1 is respectively connected to the a terminal of the single three-phase combined transformer 2 and the P terminal of the three-phase static var generator 3; the current magnitude of the A terminal of the power transmission line 1 input into the single three-phase combined 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 K terminal of the single three-phase combined transformer 2 is connected with the N terminal of the three-phase static var generator 3 and then grounded; the three-phase static var generator 3 comprises six high-power transistors BG, a direct-current energy storage capacitor and a pulse width modulator CP; 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 series points of the emitter and collector in the three groups of high-power transistor groups form the external P terminal and M terminal of the three-phase static var generatorThe three groups of high-power transistor groups are connected in parallel, the connection point of an emitting electrode is a point e, the connection point of a collecting electrode is a point f, and a direct-current energy storage capacitor is connected between the point e and the point f; the control stage of each high-power transistor BG is connected to the output end of the pulse width modulator CP. The M terminal of the three-phase static var generator 3 is correspondingly connected with the B terminal of the single three-phase combined transformer 2, and the N terminal of the three-phase static var generator 3 is correspondingly connected with the C terminal of the single three-phase combined transformer 2; the three-phase port sides a, b and c of the single three-phase combined transformer 2 provide three-phase symmetrical power supply for users.
The high-power transistor BG shown in FIG. 3 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 single three-phase combined transformer three-phase power supply structure and aforesaid 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, single three-phase combined transformer 2 and three-phase static var generator 3. The power transmission line 1 is used for carrying out current transmission on the single three-phase combined transformer 2 and the three-phase static var generator 3; the single three-phase combined 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 users; 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 single three-phase combined transformer 2; the power transmission line 1 is respectively connected with a three-phase static var generator 3 and a single three-phase combined transformer 2, the three-phase static var generator 3 is connected with the single three-phase combined transformer 2, and the single three-phase combined 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 modulator CP in the three-phase static var generator 3 structure and the connected mode between the three with above-mentioned utility model embodiment one in as shown in figure 3 the structure identical, this no longer gives unnecessary details here.
In the embodiment of the utility model, the high-power transistor BG in the embodiment of the utility model 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, a three-phase power supply structure of a single three-phase combined transformer according to an embodiment of the present invention is different from the first embodiment of the present invention in that the power transmission line 1 according to an 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 single-three phase combined transformer 2 and the P terminal of the three-phase static var generator 3, and the current input to the A terminal of the single-three phase combined 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 B-phase transmission line L in transmission line 1BThe N terminal of the three-phase static var generator 3 is accessed; the M terminal and the N terminal of the three-phase static var generator 3 are respectively and correspondingly connected with the B terminal and the C terminal of the single three-phase combined transformer 2, and the K terminal of the single three-phase combined transformer 2 is connected with the N terminal of the three-phase static var generator 3; the three-phase sides a, b and c of the single three-phase combined transformer 2 provide three-phase symmetrical power supply for users.
Claims (6)
1. A single three-phase combined transformer three-phase power supply configuration, the power supply configuration comprising: the power transmission system comprises a power transmission line (1), a single three-phase combined transformer (2) and a three-phase static var generator (3), wherein the power transmission line (1) is respectively connected with the single three-phase combined transformer (2) and the three-phase static var generator (3); the method is characterized in that: the single-three-phase combined transformer (2) comprises a single-phase transformer T1 and a three-phase transformer T2, wherein a u terminal in an output port of the single-phase transformer T1 is connected with a b-phase line on the three-phase output side of the three-phase transformer T2, and a v terminal in an output port of the single-phase transformer T1 is connected with a c-phase line on the three-phase output side of the three-phase transformer T2; the B terminal and the C terminal of the input end of the three-phase transformer T2 are respectively connected with the M terminal and the N terminal of the output end of the three-phase static var generator (3), and the N terminal of the three-phase static var generator (3) is connected with the K terminal of the single-phase transformer T1; and the a, b and c three-phase ports of the single three-phase combined transformer (2) are used as output ports to provide three-phase power for users.
2. The three-phase power supply structure of the single three-phase combined transformer as claimed in claim 1, wherein: when the power transmission line (1) is a single-phase power transmission line, the power transmission line (1) is respectively connected with an A terminal in the primary side input end of the single three-phase combined transformer (2) and a P terminal in the output end of the three-phase static var generator (3); the N terminal in the three-phase static var generator (3) is grounded.
3. The three-phase power supply structure of the single three-phase combined transformer as claimed in claim 1, wherein: an A-phase power transmission line L in the power transmission line (1) when the power transmission line (1) is a two-phase power transmission lineAThe three-phase static var generator is respectively connected with an A terminal in the primary side input end of the single three-phase combined transformer (2) and a P terminal in the output end of the three-phase static var generator (3); n terminal in input port of three-phase static var generator (3) and B phase transmission line L in transmission line (1)BAre connected.
4. The three-phase power supply structure of the single three-phase combined transformer as claimed in claim 1, wherein: the three-phase static var generator (3) comprises six high-power transistors BG, a direct-current energy storage capacitor and a pulse width modulator CP; 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 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, the connection point of an emitting electrode is a point e, the connection point of a collecting electrode is a point f, and a direct-current energy storage capacitor is connected between the point e and the point f in parallel; the control stage of each high-power transistor BG is connected with the output end of the pulse width modulator CP.
5. The three-phase power supply structure of single three-phase combined transformer as claimed in claim 1, whereinThe method comprises the following steps: input current I of three-phase static var generator (3)2Is half the current I of the transmission line (1); input voltage U in three-phase transformer T2BAnd the input voltage U in the single-phase transformer T1AEqual in magnitude and 90 degrees in phase to each other; input current I of B terminal in single three-phase combined transformer (2)BEqual to the input current I of the three-phase static var generator (3)2。
6. The three-phase power supply structure of the single three-phase combined transformer as claimed in claim 4, wherein: the high-power transistor BG adopts an integrated gate commutated thyristor or an insulated gate bipolar transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921919147.5U CN210744743U (en) | 2019-11-08 | 2019-11-08 | Three-phase power supply structure of single three-phase combined transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921919147.5U CN210744743U (en) | 2019-11-08 | 2019-11-08 | Three-phase power supply structure of single three-phase combined transformer |
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| CN210744743U true CN210744743U (en) | 2020-06-12 |
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| CN201921919147.5U Active CN210744743U (en) | 2019-11-08 | 2019-11-08 | Three-phase power supply structure of single three-phase combined transformer |
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