CN110635482B - Single-phase combined transformer power supply structure - Google Patents
Single-phase combined transformer power supply structure Download PDFInfo
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- CN110635482B CN110635482B CN201911085361.XA CN201911085361A CN110635482B CN 110635482 B CN110635482 B CN 110635482B CN 201911085361 A CN201911085361 A CN 201911085361A CN 110635482 B CN110635482 B CN 110635482B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
- H02M5/14—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion between circuits of different phase number
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
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- Ac-Ac Conversion (AREA)
Abstract
The invention discloses a power supply structure of a single-phase combined transformer, and belongs to the technical field of power supply and distribution of a power grid. The input end of a first single-phase transformer T1 in the single-phase combined transformer is connected with the power transmission line, and the input end of a second single-phase transformer T2 in the single-phase combined transformer is connected with the three-phase static var generator; the single-phase combined transformer comprises a first single-phase transformer T1 and a second single-phase transformer T2, a k terminal in a secondary winding of the first single-phase transformer T1 is connected to a middle tap m of a secondary winding of the second single-phase transformer T2, and an a terminal in an output port of the first single-phase transformer T1, a b terminal and a c terminal in an output port of the second single-phase transformer T2 form a three-phase output end together to provide a three-phase power supply for a user.
Description
Technical Field
The invention relates to the technical field of power supply and distribution of a power grid.
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, because the transmission line is generally erected outdoors, the regional span is wide, the environmental conditions are variable, and various disconnection faults are generated due to the long-term mechanical force, the 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.
Disclosure of Invention
The invention aims to provide a power supply structure of a single-phase combined transformer, which can effectively solve the technical problem that a single-phase or two-phase power transmission line provides a three-phase power supply.
The purpose of the invention is realized by the following technical scheme: a power supply structure of a single-phase combined transformer comprises a power transmission line, the single-phase combined transformer and a three-phase static var generator, wherein the power transmission line is connected with the input end of the three-phase static var generator, the input end of a first single-phase transformer T1 in the single-phase combined transformer is connected with the power transmission line, and the input end of a second single-phase transformer T2 in the single-phase combined transformer is connected with the three-phase static var generator; the single-phase combined transformer comprises a first single-phase transformer T1 and a second single-phase transformer T2, a k terminal in a secondary winding of the first single-phase transformer T1 is connected to a middle tap m of a secondary winding of the second single-phase transformer T2, and an a terminal in an output port of the first single-phase transformer T1, a b terminal and a c terminal in an output port of the second single-phase transformer T2 form a three-phase output end together to provide a three-phase power supply for a user.
A terminal B and a terminal C in the input end of the second single-phase transformer T2 are respectively connected with a terminal M and a terminal N in the output end of the three-phase static var generator, and the terminal N of the three-phase static var generator is connected with a terminal K of the first single-phase transformer T1;
when the power transmission line 1 is a single-phase power transmission line, the power transmission line is respectively connected to an A terminal in a single-phase combined transformer and a P terminal of a three-phase static var generator; and the N terminal in the three-phase static var generator is grounded.
A-phase power transmission line L of the power transmission lines when the power transmission lines are two-phase power transmission lines A Respectively connected to the A terminal of the single-phase combined transformer and the P terminal of the three-phase static var generator; b-phase power line L in power line B And connecting the input end of the three-phase static var generator to an N terminal.
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; emitters which are not connected in series in the three groups of high-power transistors are connected in parallel to form an emitter connection point e, collectors which are not connected in series are also connected in parallel to form a collector connection 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 a pulse width modulator CP;
input current I of the three-phase static var generator 2 Is half of the current I of the transmission line; second single phaseInput voltage U in transformer T2 B And the input voltage U of the first single-phase transformer T1 A Equal in magnitude and 90 degrees in phase to each other; input current I of B terminal in single-phase combined transformer B Equal to input current I of three-phase static var generator 2 。
The high-power transistor BG adopts an integrated gate commutated thyristor or an insulated gate bipolar transistor.
Compared with the prior art, the technology of the invention has the beneficial effects that:
1. in the place where only a single-phase transmission line with a grounded neutral point is erected in the power distribution network, as 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 power quality of the power grid is allowed, the three-phase power supply can be provided through the power supply structure;
2. in the place where only two-phase transmission lines are erected in the power distribution network, because a three-phase power supply is needed in case of emergency and the time for erecting a new three-phase line is not allowed, under the condition that the power quality of the power grid is allowed, the three-phase power supply can be provided through the power supply structure;
3. when a three-phase user has one or two-phase broken lines 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 which may exist in outdoor emergency repair of power maintenance personnel are reduced, and the possibility of larger accidents caused by emergency situations is also reduced.
4. The structure is simple, the universality is good, the economy 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 a specific structure of the present invention.
Fig. 3 is a schematic structural diagram of a three-phase static var generator according to the present invention.
Fig. 4 is a connection diagram of a specific structure of the second embodiment of the present invention.
Fig. 5 is a flow chart of the pwm control 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 of the invention 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-phase combined transformer 2 1 The input current of the B terminal in the single-phase combined transformer 2 is I B The input current of the three-phase static var generator 3 is I 2 The input voltage between the A terminal and the K terminal in the single-phase combined transformer 2 is U A The input voltage between the terminal B and the terminal C of the single-phase combined transformer 2 is U B (ii) a Input current I of P terminal in three-phase static var generator 3 2 Is half the current I of the transmission line 1; input voltage U between terminal B and terminal C in single-phase combined transformer 2 B Input voltage U between A terminal and K terminal in single-phase combined transformer 2 A Equal in magnitude and 90 degrees in phase to each other; input current I of B terminal of single-phase combined transformer B Input current I to P terminal of three-phase static var generator 2 The sizes are equal, and the three-phase side of the single-phase combined transformer 2 is used for supplying a symmetrical three-phase power supply to the load needing three-phase electric energy to operate.
Example one
As shown in fig. 1, the embodiment of the present invention provides a power supply structure for a single-phase combined transformer, which mainly includes a power transmission line 1, a single-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 a single-phase combined transformer 2 and a three-phase static var generator 3; the single-phase combined transformer 2 is formed by connecting a first single-phase transformer T1 and a second single-phase transformer T2 according to the specification, 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-phase combined transformer 2; the transmission line 1 is respectively connected with a three-phase static var generator 3 and a single-phase combined transformer 2, the output side of the three-phase static var generator 3 is connected with the input side of the single-phase combined transformer 2, and the three-phase side of the single-phase combined transformer 2 provides a three-phase power supply for users.
As shown in fig. 2 and fig. 3, the 220V transmission line 1 of the neutral-grounded power grid is a single-phase transmission line and has a current I, and the transmission line 1 is respectively connected to the a terminal of the single-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 single-phase combined transformer 2 is I 1 The magnitude of the input current of the P terminal of the three-phase static var generator 3 is I 2 The input current of the B terminal in the single-phase combined transformer 2 is I B The K terminal of the single-phase combined transformer 2 and the N terminal of the three-phase static var generator 3 are both grounded GND; 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 emitter electrodes in the three groups of high-power transistor groups and the serial connection points of the collector electrodes form external P terminals, M terminals and N terminals of the three-phase static var generator, the three groups of high-power transistor groups are connected by the emitter electrodes in series, the connection points of the emitter electrodes are points e, the three groups of high-power transistor groups are connected by the collector electrodes in series, the connection points of the collector electrodes are points f, and a direct-current energy storage capacitor is connected between the points e and 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-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-phase combined transformer 2; three-phase port sides a, b and c of the single-phase combined transformer 2 provide three-phase symmetrical power for users.
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 power supply structure of the single-phase combined transformer according to the embodiment of the present invention is the same as the basic structure of the first embodiment of the present invention, that is, as shown in fig. 1, the power supply structure mainly includes a power transmission line 1, a single-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 a single-phase combined transformer 2 and a three-phase static var generator 3; the single-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-phase combined transformer 2; the transmission line 1 is respectively connected with a three-phase static var generator 3 and a single-phase combined transformer 2, the three-phase static var generator 3 is connected with the single-phase combined transformer 2, and the single-phase combined transformer 2 provides three-phase power for users.
The structures and the connection modes of the six high-power transistors BG, the direct-current energy storage capacitors, and the pulse width modulators CP in the three-phase static var generator 3 in the embodiment of the present invention are completely the same as those shown in fig. 3 in the first embodiment of the present invention, and thus, the description thereof is omitted.
In the embodiment of the invention, 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.
Referring to fig. 2 and 4, a power supply structure of a single-phase combined transformer according to an embodiment of the present invention differs 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; the control flow of the pulse width modulator CP is shown in FIG. 5, L in a two-phase power line A 、L B The voltage between them 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 1 A Are respectively connected withThe A terminal of the single-phase combined transformer 2 and the P terminal of the three-phase static var generator 3 are input, and the current input into the A terminal of the single-phase combined transformer 2 is I 1 The magnitude of the current input to the P terminal of the three-phase static var generator 3 is I 2 (ii) a The N terminal of the three-phase static var generator 3 is connected with the K terminal of the single-phase combined transformer 2, and the B-phase transmission line L in the transmission line 1 B The 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-phase combined transformer 2; the three-phase sides a, b and c of the single-phase combined transformer 2 provide three-phase symmetrical power supply for users.
Claims (3)
1. A single-phase modular transformer power supply configuration comprising: power transmission line (1), single-phase combination formula transformer (2) and three-phase static var generator (3), its characterized in that: when the power transmission line (1) is a single-phase power transmission line, a P terminal of an input end of the three-phase static var generator (3) is connected with the power transmission line (1), and an N terminal of the input end of the three-phase static var generator (3) is connected with GND; the A terminal of the input end of a first single-phase transformer T1 in the single-phase combined transformer (2) is connected with the power transmission line (1), and the B terminal of the input end of a second single-phase transformer T2 in the single-phase combined transformer (2) is connected with the M terminal of the three-phase static var generator (3); the single-phase combined transformer (2) comprises a first single-phase transformer T1 and a second single-phase transformer T2, a K terminal in a secondary winding of the first single-phase transformer T1 is connected to a middle tap m terminal of a secondary winding of the second single-phase transformer T2, an a terminal in an output port of the first single-phase transformer T1, a b terminal and a C terminal in an output port of the second single-phase transformer T2 form a three-phase output end together to provide a three-phase power supply for a user, the K terminal in an input port of the first single-phase transformer T1 is connected with GND, and the C terminal in an output port of the second single-phase transformer T2 is connected with GND;
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; emitters which are not connected in series in the three groups of high-power transistors are connected in parallel to form an emitter connection point e, collectors which are not connected in series are also connected in parallel to form a collector connection point f, and a direct-current energy storage capacitor is connected between the points e and f; the control stage of each high-power transistor BG is connected to the output end of the pulse width modulator CP.
2. The power supply structure of a single-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 line A The A terminal of the single-phase combined transformer (2) and the P terminal of the three-phase static var generator (3) are respectively connected; b-phase transmission line L in a transmission line (1) B And the N terminal is connected into the input end of the three-phase static var generator (3).
3. The power supply structure of the single-phase combined transformer as claimed in claim 1, wherein: input current I of the three-phase static var generator (3) 2 Is half the current I of the transmission line (1); input voltage U in a second single-phase transformer T2 B And the input voltage U in the first single-phase transformer T1 A Equal in magnitude and 90 degrees in phase to each other; input current I of terminal B in single-phase combined transformer (2) B Equal to the input current I of the three-phase static var generator (3) 2 。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911085361.XA CN110635482B (en) | 2019-11-08 | 2019-11-08 | Single-phase combined transformer power supply structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911085361.XA CN110635482B (en) | 2019-11-08 | 2019-11-08 | Single-phase combined transformer power supply structure |
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| CN110635482A CN110635482A (en) | 2019-12-31 |
| CN110635482B true CN110635482B (en) | 2023-02-03 |
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| CN114284040B (en) * | 2021-12-31 | 2024-06-07 | 南京立业电力变压器有限公司 | Three-phase and single-phase universal integrated full-capacity power transformer |
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2019
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