CN210669531U - Non-three-phase-to-three-phase power supply structure based on Scott wiring transformer - Google Patents
Non-three-phase-to-three-phase power supply structure based on Scott wiring transformer Download PDFInfo
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- CN210669531U CN210669531U CN201921926169.4U CN201921926169U CN210669531U CN 210669531 U CN210669531 U CN 210669531U CN 201921926169 U CN201921926169 U CN 201921926169U CN 210669531 U CN210669531 U CN 210669531U
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Abstract
The utility model discloses a non-three-phase to three-phase power supply structure based on a Scott wiring transformer, which comprises a power transmission line, a power converter and the Scott wiring transformer; the input end of the Scott wiring transformer is respectively connected with the output end of the power converter and the power transmission line, the input end of the power converter is connected with the power transmission line, and a three-phase port of the Scott wiring transformer is used as an output port to provide three-phase power for users. 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 Scott wiring 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 scott's wiring 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 electric 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 scott wiring transformer, this structure including be used for to scott wiring transformer and power converter carry out the power transmission line of supplying power, be used for with in the power transmission line through the current of reposition of redundant personnel transform the power converter of scott wiring transformer power supply to, and be used for with the power transmission line and the power converter provided electric energy vary voltage and phase modulation to provide symmetrical three phase power supply's scott wiring transformer to the user;
the three-phase port of the Scott wiring transformer is used as an output port to provide a symmetrical three-phase power supply for a user, primary windings of M single-phase transformers in the Scott wiring transformer are connected with the output port of the power converter, primary windings of T single-phase transformers in the Scott wiring transformer are connected with the power transmission line, and the input end of the power converter is connected with the power transmission line.
Specifically, when the power transmission line is a single-phase power transmission line, a P terminal in an input end of a power converter is connected with the power transmission line, a Q terminal in the input end of the power converter is grounded, any one terminal in a primary winding input end of a T-seat single-phase transformer in a scott connection transformer is connected with the power transmission line, a terminal which is not connected with the power transmission line in the primary winding input end of the T-seat single-phase transformer in the scott connection transformer is grounded, a C terminal in a primary winding input end of an M-seat single-phase transformer in the scott connection transformer is connected with a J terminal in an output end of the power converter, a D terminal in the primary winding input end of the M-seat single-phase transformer in the scott connection transformer is connected with a K terminal, and three phase.
Specifically, when the power transmission line is a two-phase power transmission line, two terminals in an input port of the power converter are respectively connected with the two-phase power transmission line of the power transmission line, two ends of a primary winding input end of a T-seat single-phase transformer in the scott connection transformer are respectively connected with the two-phase power transmission line of the power transmission line, a C terminal in a primary winding input end of M-seat single-phase transformers in the scott connection transformer is connected with a J terminal at an output end of the power converter, a D terminal in a primary winding input end of the M-seat single-phase transformers in the scott connection transformer is connected with a K terminal, and three phase sides of the scott connection transformer provide symmetrical.
Preferably, the power converter includes a first high-power switch device as a rectifying side and a second high-power switch device as an inverting side, the first high-power switch device and the second high-power switch device are connected back to back, a dc energy storage capacitor is connected between R, S two connection points where the first high-power switch device and the second high-power switch device are connected to provide voltage support for an emitter and a collector of the first high-power switch device and the second high-power switch device, and control electrodes of the first high-power switch device and the second high-power switch device are both connected to the pulse width modem.
Specifically, the input current of the first high-power switch device of the power converter is equal to one half of the input current of the power transmission line, and the voltage U of the input port of the T-seat single-phase transformer in the Scott junction transformerAVoltage U of input port of single-phase transformer with M blocksBEqual in magnitude and 90 ° in phase.
Further preferably, the first high-power switching device comprises four high-power transistors, and a control electrode of each high-power transistor is connected with the pulse width modulation controller; every two high-power transistors are connected in series with a collector through an emitter to form a group of high-power transistor groups, collectors which are not connected in series in the two groups of high-power transistor groups are connected, and emitters which are not connected in series are also connected; the series points of the emitter and the collector in the two groups of high-power transistor groups form the current input end of the first high-power switching device.
Further preferably, the second high-power switching device comprises four high-power transistors, and a control electrode of each high-power transistor is connected with the pulse width modulation controller; every two high-power transistors are connected in series with a collector through an emitter to form a group of high-power transistor groups, collectors which are not connected in series in the two groups of high-power transistor groups are connected in parallel, and emitters which are not connected in series are also connected in parallel; the series points of the emitter and the collector in the two groups of high-power transistor groups form the current input end of the second high-power switching device.
Still further preferably, the high power transistor may employ an integrated gate commutated thyristor.
Still further preferably, the high power transistor may also be 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;
thirdly, when one phase or two phases of the power line are disconnected, and the maintenance environment is severe, three-phase electric energy can be provided by the method, and the power line is maintained after the weather environment is improved, so that potential safety hazards caused by outdoor emergency repair of power maintenance personnel are 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 a power converter according to a 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-scott connection transformer, 3-power converter, 4-pulse width modem, SVG 1-first high power switching device, SVG 2-second high power switching device, BG-high power transistor, U-high power switching deviceAPrimary winding input voltage, U, of a T-block single-phase transformer in a Scott-junction transformerBInput voltage, I-line current, I of the primary winding of a single-phase transformer of M in a Scott junction transformer1Input current of primary winding of T-block single-phase transformer in Scott-junction transformer, I2-an input current of the first high power switching device.
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:
let the current of the transmission line 1 be I, the input current I of the primary winding of the T-seat single-phase transformer in the Scott junction transformer 21The input current of the first high-power switching device SVG1 is I2And the input voltage between the terminal A and the terminal B of the primary winding of the T-seat single-phase transformer in the Scott wiring transformer 2 is UAAnd the input voltage between the terminal C and the terminal D of the primary winding of the M single-phase transformers in the Scott connection transformer 2 is UB(ii) a Power converterInput current I of first high-power switching device SVG1 in 32Is a transmission line LAIs one half of the current I of (a); input voltage U of primary winding of M single-phase transformers in Scott wiring transformer 2BInput voltage U of primary winding of T-seat single-phase transformer in Scott wiring transformer 2AEqual in size and 90 ° in phase with each other, the three-phase side of the scott connection transformer 2 is operated by providing a symmetrical three-phase power supply for loads requiring three-phase electrical energy.
Example one
As shown in fig. 1, the embodiment of the present invention provides a scott connection transformer-based non-three-phase to three-phase power supply structure, which mainly includes a power transmission line 1, a scott connection transformer 2 and a power converter 3. The power transmission line 1 is used for carrying out current transmission on a Scott wiring transformer 2 and a power converter 3; the Scott wiring transformer 2 is used for transforming and phase-modulating the current provided by the power transmission line 1 and the power converter 3 and then providing a symmetrical three-phase power supply for users; the power converter 3 is used for converting the shunted current in the power transmission line 1 and supplying power to the Scott wiring transformer 2; the power transmission line 1 is respectively connected with a power converter 3 and a Scott wiring transformer 2, the power converter 3 is connected with the Scott wiring transformer 2, and the Scott wiring transformer 2 provides three-phase power for users.
As shown in fig. 2 and 3, the 220V transmission line 1 of the neutral-point-grounded power grid is a single-phase transmission line and has a current I, the transmission line 1 is connected to the a terminal of the primary winding of the T-seat single-phase transformer in the scott connection transformer 2 and the P terminal of the power converter 3, respectively, and the magnitude of the current input from the transmission line 1 to the a terminal of the primary winding of the T-seat single-phase transformer in the scott connection transformer 2 is I1The power transmission line 1 inputs the current magnitude of the P terminal of the power converter 3 as I2(ii) a The power converter 3 comprises a first high-power switching device SVG1 serving as a rectification side and a second high-power switching device SVG2 serving as an inversion side, wherein the first high-power switching device SVG1 and the second high-power switching device SVG2 are connected in a back-to-back mode, and the connection points of the first high-power switching device SVG1 and the second high-power switching device SVG2 are R, S respectively; a dc energy storage capacitor is arranged in parallel between the two connection points R, S,voltage support is provided for the emitter and the collector of the first high power switching device and the second high power switching device; the control electrodes of the first high-power switching device SVG1 and the second high-power switching device SVG2 are both connected with the pulse modem 4; the Q terminal of the power converter 3 is grounded, and the J terminal and the K terminal of the power converter 3 are respectively and correspondingly connected with the C terminal and the D terminal of the primary winding of the M single-phase transformers in the Scott connection transformer 2; the terminal B of the primary winding of the T-seat single-phase transformer in the Scott connection transformer 2 is grounded, and three-phase sides a, B and c of the Scott connection transformer 2 provide three-phase symmetrical power supplies for users.
Wherein, the input current I of the first high-power switch device SVG1 in the power converter 32Is a transmission line LAIs one half of the current I of (a); input voltage U of primary winding of M single-phase transformers in Scott wiring transformer 2BInput voltage U of primary winding of T-seat single-phase transformer in Scott wiring transformer 2AEqual in magnitude and 90 in phase with each other.
In the embodiment of the present invention, the first high-power switching device SVG1 includes four high-power transistors BG, and a control electrode of each high-power transistor BG is connected to the pwm controller 4; every two of four high-power transistors BG in the first high-power switching device SVG1 are connected in series with a collector through an emitter to form two groups of high-power transistor groups, the collectors which are not connected in series of the two groups of high-power transistor groups are connected in parallel, and the emitters which are not connected in series are also connected in parallel; the series points of the emitter and the collector in the two groups of high-power transistor groups in the first high-power switching device SVG1 form a current output terminal P, Q of the first high-power switching device SVG1 of the power converter 3. Emitters which are not connected in series in the two groups of high-power transistors in the SVG1 are connected to form a connection point e, and collectors which are not connected in series in the two groups of high-power transistors in the first high-power switching device SVG1 are connected to form a connection point f.
In the embodiment of the present invention, the second high-power switch device SVG2 has the same structure as the first high-power switch device SVG1, the second high-power switch device SVG2 includes four high-power transistors BG, and the control electrode of each high-power transistor BG is connected to the pwm controller 4; two pairs of four high-power transistors BG in the second high-power switching device SVG2 are connected in series with a collector through an emitter to form two groups of high-power transistor groups, the collectors which are not connected in series of the two groups of high-power transistor groups are connected in parallel, and the emitters which are not connected in series are also connected in parallel; the series points of the emitter and the collector in the two groups of high-power transistor groups in the second high-power switching device SVG2 form the current output terminal J, K of the second high-power switching device SVG2 of the power converter 3. Emitters which are not connected in series in the two groups of high-power transistor groups in the second high-power switch device SVG2 are connected to form a connection point g, and collectors which are not connected in series in the two groups of high-power transistor groups in the second high-power switch device SVG2 are connected to form a connection point h.
The embodiment of the utility model provides an in, tie point e links to each other with tie point g, constitutes tie point R, and tie point f links to each other with tie point h, constitutes tie point S, inserts direct current energy storage electric capacity between tie point R and the tie point S. The high-power transistor BG shown in fig. 4 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 scott wiring transformer with the aforesaid the utility model provides a basic structure is the same, as shown in fig. 1 promptly, this power supply structure mainly includes power transmission line 1, scott wiring transformer 2 and power converter 3. The power transmission line 1 is used for carrying out current transmission on a Scott wiring transformer 2 and a power converter 3; the Scott wiring transformer 2 is used for transforming and phase-modulating the current provided by the power transmission line 1 and the power converter 3 and then providing a symmetrical three-phase power supply for users; the power converter 3 is used for converting the shunted current in the power transmission line 1 and supplying power to the Scott wiring transformer 2; the power transmission line 1 is respectively connected with a power converter 3 and a Scott wiring transformer 2, the power converter 3 is connected with the Scott wiring transformer 2, and the Scott wiring transformer 2 provides three-phase power for users.
The embodiment of the utility model provides an in first high power switch device SVG1 with second high power switch device SVG 2's structure and the aforesaid the utility model discloses in the embodiment one like the structure shown in fig. 3 is identical, so this no longer gives unnecessary details.
With reference to fig. 3 and 4, the non-three-phase to three-phase power supply structure based on the scott connection transformer according to the embodiment of the present invention is different from the above-mentioned 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 primary winding of the T-base single-phase transformer in the Scott wiring transformer 2 and the P terminal of the power converter 3, and the current input to the A terminal of the primary winding of the T-base single-phase transformer in the Scott wiring transformer 2 is I1The magnitude of the current input to the P terminal of the power converter 3 is I2(ii) a B-phase transmission line L in transmission line 1BRespectively connected to a terminal B of a primary winding of a T-seat single-phase transformer in the Scott connection transformer 2 and a terminal Q of the power converter 3; the power converter 3 comprises a first high-power switching device SVG1 serving as a rectifying side and a second high-power switching device SVG2 serving as an inverting side, the connection points of the first high-power switching device SVG1 and the second high-power switching device SVG2 are R, S two connection points respectively, a direct-current energy storage capacitor is arranged between R, S two connection points in parallel and used for providing voltage support for an emitter and a collector of the first high-power switching device and the second high-power switching device, and control electrodes of the first high-power switching device SVG1 and the second high-power switching device SVG2 are connected with the pulse modem 4; the J terminal and the K terminal of the power converter 3 are respectively and correspondingly connected with the C terminal and the D terminal of the primary winding of the M single-phase transformers in the Scott wiring transformer 2; the scott connection transformer 2 provides three-phase symmetrical power to the user on three-phase sides a, b, c.
Wherein, the input current I of the first high-power switch device SVG1 in the power converter 32For A-phase transmission line L in transmission line 1AIs one half of the current I of (a); input voltage U of primary winding of M single-phase transformers in Scott wiring transformer 2BPrimary winding of T-base single-phase transformer in Scott connection transformer 2Group input voltage UAEqual in magnitude and 90 in phase with each other.
The embodiment of the utility model provides a high-power transistor BG is integrated gate commutated thyristor IGCT; in practical implementation, the high-power transistor BG may also adopt an insulated gate bipolar transistor IGBT.
Claims (10)
1. A scott connection transformer based non-three phase to three phase power supply configuration, the power supply configuration comprising:
a power transmission line (1) for supplying power to a Scott junction transformer (2) and a power converter (3);
the Scott wiring transformer (2) is used for transforming and phase-modulating the current provided by the power transmission line (1) and the power converter (3) and providing a symmetrical three-phase power supply for users;
a power converter (3) for converting the current shunted in the transmission line (1) and supplying power to the Scott junction transformer (2);
the three-phase port of the Scott wiring transformer (2) serves as an output port to provide three-phase power for users, the input end of the Scott wiring transformer (2) is connected with the output end of the power converter (3) and the power transmission line (1) respectively, and the input end of the power converter (3) is connected with the power transmission line (1).
2. The scott connection transformer-based non-three-phase to three-phase power supply structure according to claim 1, wherein the scott connection transformer (2) is composed of T-block single-phase transformers and M-block single-phase transformers, and C terminals and D terminals of the scott connection transformer (2) are respectively connected with J terminals and K terminals of output ports of the power converter (3).
3. The scott connection transformer based non-three-to-three-phase power supply configuration according to claim 2, characterized in that the power line (1) is a single-phase power line, the P-terminal of the input of the power converter (3) is connected to the power line (1), the Q-terminal of its input is grounded; any one terminal of the input end of the primary side winding of the T-seat single-phase transformer in the Scott wiring transformer (2) is connected with the power transmission line (1), and the terminal which is not connected with the power transmission line (1) in the input end of the primary side winding is grounded.
4. The scott connection transformer based non-three to three-phase power supply configuration according to claim 2, characterized in that the power line (1) is a two-phase power line, and two terminals of the input ports of the power converter (3) are connected to the two-phase power line of the power line (1), respectively; two terminals of the input end of the primary winding of the T-seat single-phase transformer in the Scott connection transformer (2) are respectively connected with two-phase transmission lines of the transmission lines (1).
5. The scott connection transformer-based non-three-phase to three-phase power supply configuration according to claim 3 or 4, characterized in that the power converter (3) comprises a first power switching device (SVG1) on the rectifying side, a second power switching device (SVG2) on the inverting side, a direct current energy storage capacitor and a pulse width modem (4), the first power switching device (SVG1) and the second power switching device (SVG2) are connected in a back-to-back manner, and the connection points of the first power switching device (SVG1) and the second power switching device (SVG2) are R, S; a direct current energy storage capacitor is connected between the two connection points R, S and is used for providing voltage support between the emitter and the collector of the first power switch device and the second power switch device; the pulse width modem (4) is connected with the control electrodes of the first power switch device (SVG1) and the second power switch device (SVG 2).
6. Scott-based non-three-phase to three-phase power supply configuration according to claim 5, characterized in that the magnitude of the input current of the first power switching device (SVG1) of the power converter (3) is equal to half the magnitude of the input current in the transmission line (1); voltage U of input port of T-base single-phase transformer in Scott wiring transformer (2)AVoltage U of input port of single-phase transformer with M blocksBEqual in magnitude and 90 ° in phase.
7. A Scott-based non-three-to-three phase power supply configuration according to claim 6, characterised in that the first power switching device (SVG1) comprises four power transistors (BG), the gate of each power transistor (BG) being connected to a pulse width modem (4); every two power transistors (BG) are connected in series with the collector of the other power transistor (BG) through the emitter of one power transistor (BG) to form a group of power transistor groups, and the two groups of power transistor groups are connected in parallel in the forward direction; the series points of the emitters and the collectors in the two groups of power transistors form a current input end P, Q of a first power switch device (SVG 1).
8. A Scott-based non-three-to-three phase power supply configuration according to claim 7, characterised in that the second power switching device (SVG2) comprises four power transistors (BG), the gate of each power transistor (BG) being connected to a pulse width modem (4); every two power transistors (BG) are connected in series with a collector through an emitter to form a group of power transistor groups, and the two groups of power transistor groups are connected in parallel in the forward direction; the series points of the emitter and the collector in the two groups of power transistor groups form a current output end J, K of a second power switch device (SVG 2).
9. The scott connection transformer-based non-three-to-three-phase power supply configuration according to claim 8, characterized in that the power transistors (BG) may be integrated gate commutated thyristors.
10. The scott connection transformer-based non-three-to-three-phase power supply configuration according to claim 8, characterized in that the power transistors (BG) may be insulated gate bipolar transistors.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921926169.4U CN210669531U (en) | 2019-11-08 | 2019-11-08 | Non-three-phase-to-three-phase power supply structure based on Scott wiring transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921926169.4U CN210669531U (en) | 2019-11-08 | 2019-11-08 | Non-three-phase-to-three-phase power supply structure based on Scott wiring transformer |
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| CN210669531U true CN210669531U (en) | 2020-06-02 |
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