CN210444020U - Single-phase or two-phase-to-three-phase power supply structure using YNVd transformer - Google Patents
Single-phase or two-phase-to-three-phase power supply structure using YNVd transformer Download PDFInfo
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- CN210444020U CN210444020U CN201921928586.2U CN201921928586U CN210444020U CN 210444020 U CN210444020 U CN 210444020U CN 201921928586 U CN201921928586 U CN 201921928586U CN 210444020 U CN210444020 U CN 210444020U
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Abstract
The utility model discloses an utilize single-phase or double-phase three-phase power supply structure that changes of YNVd transformer relates to power grid power supply and distribution technical field. The power transmission line is connected with the YNV transformer, 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 the three-phase static var generator and an A terminal in the YNV transformer, a K terminal in the YNV transformer is grounded, an N terminal of the three-phase static var generator is also grounded GND, B terminals and C terminals of the YNV transformer are respectively connected with an M terminal and an N terminal in an output end of the three-phase static var generator, and output ports a phase, B phase and C phase of the YNV transformer provide three-phase power for users.
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 an utilize single-phase or double-phase to change three-phase power supply structure of YNVd transformer, it can solve effectively and provide three phase power's technical problem through single-phase or double-phase power transmission line.
The purpose of the utility model adopts the technical scheme as follows: a single or two-to-three phase power supply configuration utilizing an YNvd transformer, the power supply configuration comprising: the power transmission line is connected with the YNV transformer, 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 the three-phase static var generator and an A terminal in the YNV transformer, a K terminal in the YNV transformer is grounded, an N terminal of the three-phase static var generator is also grounded GND, B terminals and C terminals of the YNV transformer are respectively connected with an M terminal and an N terminal in an output end of the three-phase static var generator, and output ports a phase, B phase and C phase of the YNV transformer provide three-phase power for users.
When the power transmission line is a two-phase power transmission line, the A-phase power transmission line L of the power transmission lineAThe three-phase static var generator is respectively connected with a P terminal in an input port of the three-phase static var generator and an A terminal of a V-shaped winding of an YNVd transformer; b-phase transmission line L of transmission lineBAnd the N terminal in the input port of the three-phase static var generator and the K terminal of the V-shaped winding of the YNVd transformer are respectively 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 arranged in parallel, the connection point of the emitting electrodes of the three groups of high-power transistor groups is point e, the connection point of the collecting electrodes of the three groups of high-power transistor groups is point f, and a direct-current energy storage capacitor is connected between the point e and the point f in parallel; the control electrode of each high-power transistor BG is connected with the output end of the pulse width modulator CP.
The input current of the P terminal of the three-phase static var generator is equal to one half of the input current in the power transmission line; input voltage U between terminal B and terminal C in YNVd transformerBInput voltage U between A terminal and K terminal in YNVd transformerAEqual in magnitude and 90 degrees in phase to each other; input current I of terminal B in YNVd 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 thyristor.
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 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 power line 1 be I, the input current I of the A terminal in the YNVd transformer 21Input current I of terminal B in YNVd transformer 2BThe input current of the P terminal of the three-phase static var generator is I2The input voltage between the A terminal and the K terminal of the YNVd transformer 2 is UAThe input voltage between the terminal B and the terminal C of the YNVd transformer 2 is UB(ii) a P terminal input current I of three-phase static var generator 32Input current I of terminal B in YNVd transformer 2 is one-half of current I of power transmission line 1BInput current I to P terminal of three-phase static var generator 32Equal in size; input voltage U between terminal B and terminal C in YNVd transformer 2BAnd input voltage U between A terminal and K terminal in YNVd transformer 2AEqual in size and 90 degrees in phase with each other, the three-phase side of the YNV 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 single-phase or two-phase to three-phase power supply structure using an YNvd transformer, and the power supply structure mainly includes a power transmission line 1, an YNvd transformer 2 and a three-phase static var generator 3. The power transmission line 1 is used for carrying out current transmission on an YNVd transformer 2 and a three-phase static var generator 3; the YNVd 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 YNVd transformer 2; the power transmission line 1 is respectively connected with a three-phase static var generator 3 and an YNVd transformer 2, the three-phase static var generator 3 is connected with the YNVd transformer 2, and the YNVd transformer 2 provides three-phase power for users backwards.
As shown in fig. 2 and 3, a 220V power transmission line 1 of the neutral point grounding power grid is a single-phase power transmission line and has current I, and the power transmission line 1 is respectively connected to an a terminal in an YNVd transformer 2 and a P terminal of a three-phase static var generator 3; the current magnitude of A terminal of power transmission line 1 input YNVd 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 YNVd 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 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 stage of each high-power transistor BG is connected to the output 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.
Wherein, the input current I of the P terminal of the three-phase static var generator2Input current I of terminal B in YNVd transformer 2 is one-half of current I of power transmission line 1BInput current to P terminal of three-phase static var generatorI2Equal in size; input voltage U between terminal B and terminal C in YNVd transformer 2BAnd input voltage U between A terminal and K terminal in YNVd transformer 2AEqual in size and 90 degrees in phase with each other, the three-phase side of the YNV transformer 2 is operated by providing a symmetrical three-phase power supply for a load requiring three-phase power.
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 an utilize single-phase or double-phase three-phase power supply structure that changes of YNVd transformer and the aforesaid the utility model provides an elementary structure of one is the same, as shown in FIG. 1 promptly, this power supply structure mainly includes power transmission line 1, YNVd transformer 2 and three-phase static var generator 3. The power transmission line 1 is used for carrying out current transmission on an YNVd transformer 2 and a three-phase static var generator 3; the YNVd 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 YNVd transformer 2; the power transmission line 1 is respectively connected with a three-phase static var generator 3 and an YNVd transformer 2, the three-phase static var generator 3 is connected with the YNVd transformer 2, and the YNVd transformer 2 provides three-phase power for users backwards.
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.
Referring to fig. 2 and 4, an embodiment of the present invention provides a method for utilizing YNvd the single-phase or two-phase to three-phase power supply configuration of the transformer differs from the first embodiment in that the power line 1 in this embodiment is a two-phase power 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 YNVd transformer 2 and the P terminal of three-phase static var generator 3, and the current input to the A terminal of YNVd 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 L in a transmission line 1BThe K terminal of the YNVd transformer 2 and the N terminal of the three-phase static var generator 3 are respectively connected; the M terminal and the N terminal of the three-phase static var generator 3 are respectively connected with the B terminal and the C terminal of the YNVd transformer 2; three-phase sides a, b and c of the YNVd transformer 2 provide three-phase symmetrical power for users.
Wherein, the input current I of the P terminal of the three-phase static var generator2Input current I of terminal B in YNVd transformer 2 is one-half of current I of power transmission line 1BInput current I to P terminal of three-phase static var generator2Equal in size; input voltage U between terminal B and terminal C in YNVd transformer 2BAnd input voltage U between A terminal and K terminal in YNVd transformer 2AEqual in size and 90 degrees in phase with each other, the three-phase side of the YNV transformer 2 is operated by providing a symmetrical three-phase power supply for a load requiring three-phase power.
Claims (5)
1. A single or two-to-three phase power supply configuration utilizing an YNvd transformer, the power supply configuration comprising: power transmission line (1), YNVd transformer (2) and three-phase static var generator (3), power transmission line (1) are connected its characterized in that with YNVd transformer (2): when the power transmission line (1) is a single-phase power transmission line, the power transmission line (1) is respectively connected with a P terminal in an input end of a three-phase static var generator (3) and an A terminal in an YNVd transformer (2), a K terminal in the YNVd transformer (2) is grounded, an N terminal of the three-phase static var generator (3) is also grounded GND, a B terminal and a C terminal of the YNVd transformer (2) are respectively connected with an M terminal and an N terminal in an output end of the three-phase static var generator (3), and an output port a phase, a phase and a phase of the YNVd transformer (2) provide three-phase power for a user.
2. The single-phase or two-phase to three-phase power supply structure using the YNVd transformer as claimed in claim 1, wherein: an A-phase power line L of the power line (1) when the power line (1) is a two-phase power lineAThe three-phase static var generator is respectively connected with a P terminal in an input port of the three-phase static var generator (3) and an A terminal of a V-shaped winding of the YNVd transformer (2); b-phase transmission line L of a transmission line (1)BAnd the N terminal in the input port of the three-phase static var generator (3) and the K terminal of the V-shaped winding of the YNVd transformer (2) are respectively connected.
3. The single-phase or two-phase to three-phase power supply structure using the YNVd 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 arranged in parallel, the connection point of the emitting electrodes of the three groups of high-power transistor groups is point e, the connection point of the collecting electrodes of the three groups of high-power transistor groups is point f, and a direct-current energy storage capacitor is connected between the point e and the point f in parallel; the control electrode of each high-power transistor BG is connected with the output end of the pulse width modulator CP.
4. The single-phase or two-phase to three-phase power supply structure using the YNVd transformer as claimed in claim 1, wherein: the input current of the P terminal of the three-phase static var generator (3) is equal to one half of the input current of the power transmission line (1); input voltage U between terminal B and terminal C in YNVd transformer (2)BAnd input voltage U between A terminal and K terminal in YNVd transformer (2)AEqual in magnitude and 90 degrees in phase to each other; input current I of terminal B in YNVd transformer (2)BThree-phase static reactive power generatorAn input current I of the generator (3)2。
5. A single phase or two-to-three phase power supply configuration using YNvd transformer as claimed in claim 3, wherein: the high-power transistor BG adopts an integrated gate commutated thyristor or an insulated gate bipolar thyristor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921928586.2U CN210444020U (en) | 2019-11-08 | 2019-11-08 | Single-phase or two-phase-to-three-phase power supply structure using YNVd transformer |
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| CN201921928586.2U CN210444020U (en) | 2019-11-08 | 2019-11-08 | Single-phase or two-phase-to-three-phase power supply structure using YNVd transformer |
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| CN210444020U true CN210444020U (en) | 2020-05-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024010440A1 (en) * | 2022-07-07 | 2024-01-11 | Escobar Carballo Gustavo | 2- to 3-phase open star transformer |
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2019
- 2019-11-08 CN CN201921928586.2U patent/CN210444020U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024010440A1 (en) * | 2022-07-07 | 2024-01-11 | Escobar Carballo Gustavo | 2- to 3-phase open star transformer |
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