CN110797871A - Single-phase to three-phase power supply system based on impedance matching balance transformer - Google Patents
Single-phase to three-phase power supply system based on impedance matching balance transformer Download PDFInfo
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- 230000005540 biological transmission Effects 0.000 claims abstract description 35
- 238000004804 winding Methods 0.000 claims abstract description 33
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- 239000003990 capacitor Substances 0.000 claims description 8
- 238000004146 energy storage Methods 0.000 claims description 7
- 210000004899 c-terminal region Anatomy 0.000 claims description 6
- 230000009466 transformation Effects 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000013256 coordination polymer Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The application discloses a single-phase to three-phase power supply system based on an impedance matching balancing transformer, which comprises a power transmission line, a power supply converter and the impedance matching balancing transformer; the power transmission line is respectively connected to an A terminal of the triangular winding of the impedance matching balancing transformer and a P terminal of the power converter; and the B terminal of the triangular winding of the impedance matching balance transformer is connected with the M terminal of the power converter, and the a terminal, the B terminal and the c terminal of the star winding of the impedance matching balance transformer provide symmetrical three-phase power for a user. Therefore, the load operation that single-phase power supply needs three-phase electric energy can be realized to this application, extensively is applicable to distribution system transformation and trouble and salvagees.
Description
Technical Field
The application relates to the technical field of power distribution, in particular to a single-phase-to-three-phase power supply system based on an impedance matching balancing transformer.
Background
The user generally adopts single-phase power supply in the low-voltage power distribution field of China, and when the user needs to use three-phase electric energy, a power line needs to be erected again, so that the user is very troublesome and has long time; the power consumption needs of some special places, such as geographically dispersed users, two-phase power transmission lines are erected, and single-phase transformers are connected to the users, so that the power consumption needs are economical and do not occupy space, but individual users need three-phase power. Particularly, the user needs to use the 3-phase power supply for a short time in an emergency due to special reasons, the time for erecting a new three-phase line is not allowed, and if the power quality of the power grid is allowed, the three-phase power supply can be provided easily, so that the three-phase power supply has great economic and social values.
In a power distribution system, electrical equipment is subjected to mechanical force, electromagnetic force, thermal effect, severe oxidation, poor contact and the like for a long time, so that various disconnection faults are generated, and the equipment cannot normally operate. In 2008, the power grid in Hunan province encounters rare ice and snow disasters, more than 6 ten thousand pole falls and more than 4 thousand broken lines exist on a 10kV distribution line, more than 30 thousand pole falls and more than 30 thousand broken lines exist on a line below 10 kV. The common reasons for the disconnection of the power distribution network are as follows: (1) the copper-aluminum hinged joint is inevitably blown due to vicious circle because the contact resistance is increased and the heating is further increased because of the increase of the heating when the lead joint is loosened and particularly when the copper wire and the aluminum wire are connected; (2) when a fuse is installed, one phase of the fuse is fused due to the fact that a certain phase is damaged or three phases of the fuse are inconsistent in capacity; (3) burning, loosening and poor contact of a certain phase contact of switch or starting equipment; (4) and a certain phase of the motor winding is broken or the joint is loosened, and the like.
In a rural power grid, users are geographically dispersed, some families may have small vehicles or small workshops, and a power system is sometimes provided with a three-phase line, but due to a low telegraph pole, a lead may break off one phase or two phases of lines in severe weather, and emergency repair is very dangerous in strong wind or rain.
When the power distribution network has a disconnection fault in severe weather (such as storm), if the power distribution network is allowed by the power quality of the power grid, the emergency rescue operation of special or important three-phase loads can be met, and power maintenance workers can wait for the completion or relief of the severe weather and then carry out maintenance or rush repair, so that the satisfaction degree of users on power supply can be greatly improved, and accidents and casualties of the power maintenance workers under the severe weather condition can be prevented.
Disclosure of Invention
In order to solve the technical problem, the present application aims to provide a single-phase to three-phase power supply system based on an impedance matching balancing transformer, which not only can solve the problem that a single-phase user does not need to re-erect a circuit when needing three-phase power, but also can solve the problem that a three-phase user provides three-phase power when having one phase or two phases of broken wires, thereby avoiding the risk of more accidents caused by emergency situations.
In view of this, the following technical solutions are adopted in the present application: the application provides a single-phase to three-phase power supply system based on impedance matching balancing transformer, the system includes: a power transmission line, a power converter connected to the power transmission line, and an impedance matching balancing transformer connected to the power transmission line and the power converter; the power transmission line is respectively connected to an A terminal of the triangular winding of the impedance matching balancing transformer and a P terminal of the power converter; and the B terminal of the triangular winding of the impedance matching balance transformer is connected with the M terminal of the power converter, and the a terminal, the B terminal and the c terminal of the star winding of the impedance matching balance transformer are connected with a low-voltage distribution network with a grounded neutral point.
Optionally, the K terminal and the C terminal of the triangular winding of the impedance matching balancing transformer are grounded, and the Q terminal of the power converter is grounded.
Optionally, the K terminal and the C terminal of the triangular winding of the impedance matching balancing transformer are connected to the Q terminal of the power converter through a return line.
Optionally, the input current of the a terminal of the triangular winding of the impedance matching balancing transformer is one half of the current of the transmission line.
Optionally, the power converter includes a pulse width modulation controller, a first high-power switching device, a second high-power switching device connected in parallel with the first high-power switching device, and an energy storage capacitor, the pulse width modulation controller is connected to the first high-power switching device and the second high-power switching device respectively, and the energy storage capacitor is connected in parallel with the first high-power switching device and the second high-power switching device respectively.
Optionally, the input current of the first high-power switching device of the power converter is I2, which is half the current of the transmission line.
Optionally, the magnitude of the output voltage of the second high-power switching device of the power converter is equal to the magnitude of the input voltage between the a terminal and the K terminal of the delta winding of the impedance matching balancing transformer.
Optionally, the phase of the input voltage between the a terminal and the K terminal of the delta winding of the impedance matching balancing transformer is 90 ° to the phase of the output voltage of the second high power switching device of the power converter.
Optionally, the first high-power switching device and the second high-power switching device respectively include four high-power transistors, and a control electrode of each high-power transistor is connected to the pulse width modulation controller; and the emitter of any one high-power transistor of the first high-power switching device and the second high-power switching device is connected with the collector of any other high-power transistor in series to form a group of high-power transistor groups.
Optionally, series points of an emitter and a collector of each group of high-power transistor group of the first high-power switching device respectively form a P terminal and a Q terminal of a current input end of the first high-power switching device; the series points of the emitter and the collector of each group of high-power transistor group of the second high-power switching device respectively form an M end and an N end of the current output of the second high-power switching device.
Compared with the prior art, the beneficial effects of this application are:
the method and the system have the advantages that the three-phase power supply is needed in an emergency short time at the place where the single-phase power transmission line is only erected in the low-voltage power distribution network with the grounded neutral point, the time for erecting the new three-phase line is not allowed, and the three-phase power supply can be provided under the condition that the power quality of the power grid is allowed.
The three-phase power supply provided by the application meets the power utilization requirements of some special places, for example, users are geographically dispersed, two-phase power transmission lines are erected, a single-phase transformer is connected to the users, the three-phase power supply is economical, does not occupy the space, and individual users need three-phase power.
When a three-phase user has two-phase disconnection, the method can provide three-phase electric energy, and the circuit is maintained after the storm stops, so that the possibility of larger accidents caused by emergency is reduced.
And fourthly, the method is good in universality and easy to implement.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a frame structure of a system according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a system according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a power converter in the system according to the first embodiment of the present application;
fig. 4 is a schematic structural diagram of a system according to a second embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to better understand the inventive idea of the present application, the working principle of the present application is explained as follows:
provided with a transmission line LAIs I, impedance matchingInput current I of A terminal of triangular winding of balancing transformer T1First high-power switch device SVG1Has an input current of I2The input voltage between the A terminal and the K terminal of the triangular winding of the impedance matching balancing transformer T is UAAnd a second high-power switch device SVG2Has an output voltage of UB(ii) a SVG (scalable vector graphics) for first high-power switching device of SC (single-phase capacitor) of power converter1Input current I of2Is a transmission line LAIs one half of the current I of (a); second high-power switch device SVG2Output voltage U ofBThe input voltage between the A terminal and the K terminal of the triangular winding of the impedance matching balancing transformer T is UAThe low-voltage distribution network with equal size and 90 degrees of phase positions, which enables the star winding of the impedance matching balance transformer T and the neutral point to be grounded, is used for supplying symmetrical three-phase power supplies to the load requiring three-phase electric energy to operate.
The present application will be described in further detail with reference to examples.
Example one
As shown in fig. 1, the present embodiment provides a single-phase to three-phase power supply system based on an impedance matching balancing transformer, wherein the system includes a power transmission line LAA power converter SC and an impedance matching balancing transformer T; said transmission line LAThe power supply converter SC is connected with the impedance matching balance transformer T, the a terminal, the b terminal and the c terminal of the impedance matching balance transformer T are connected with a low-voltage distribution network with a grounded neutral point.
As shown in fig. 2, the transmission line LAThe A terminal of the T-shaped triangular winding of the impedance matching balancing transformer and the P terminal of the power converter SC are respectively connected; the B terminal of the triangular winding of the impedance matching balance transformer T is connected with the M terminal of the power converter SC, and the a terminal, the B terminal and the c terminal of the star winding of the impedance matching balance transformer T are connected with a low-voltage distribution network with a grounded neutral point so as to provide a symmetrical three-phase power supply for a user; k terminal of T triangular winding of impedance matching balancing transformer andthe C terminal is grounded to GND, and the Q terminal of the power converter SC is grounded to GND.
The power converter SC comprises a pulse width modulation controller CP and a first high-power switching device SVG1And a first high-power switch device SVG1Parallel second high-power switch device SVG2And the pulse width modulation controller CP is respectively connected with the first high-power switching device SVG1And the second high-power switching device SVG2Connected, the energy storage capacitor is respectively connected with the first high-power switch device SVG1And the second high-power switching device SVG2And (4) connecting in parallel. In this embodiment, the energy storage capacitor is a dc energy storage capacitor. In the embodiment of the application, the rectifying side of the power converter SC is a first high-power switching device SVG1The inversion side of the power converter SC is a second high-power switching device SVG2。
As shown in fig. 3, the first high-power switching device SVG1The pulse width modulation controller comprises four high-power transistors BG, wherein a control electrode of each high-power transistor BG is connected with the pulse width modulation controller CP; the emitter of any one high-power transistor BG is connected with the collector of any other high-power transistor BG in series to form a group of high-power transistor groups which are formed in a conformal manner; the collectors which are not connected in series of each group of high-power transistor groups are connected in parallel, and the emitters which are not connected in series are connected in parallel; the series points of the emitter and the collector of each group of high-power transistor group respectively form the first high-power switching device SVG1The P end and the Q end of the current output. In the embodiment of the present application, the high-power transistor BG may adopt an integrated gate commutated thyristor IGCT, and may also adopt an insulated gate bipolar transistor IGBT.
The second high-power switch device SVG2The pulse width modulation controller comprises four high-power transistors BG, wherein a control electrode of each high-power transistor BG is connected with the pulse width modulation controller CP; the emitter of any one high-power transistor BG is connected with the collector of any other high-power transistor BG in series to form a group of high-power transistor groups which are formed in a conformal manner; each group is largeCollectors which are not connected in series of the power transistor group are connected in parallel, and emitters which are not connected in series are connected in parallel; the series points of the emitter and the collector of each group of high-power transistor group respectively form the second high-power switching device SVG2M end and N end of current output. In the embodiment of the present application, the high-power transistor BG may adopt an integrated gate commutated thyristor IGCT, and may also adopt an insulated gate bipolar transistor IGBT.
In the embodiment of the application, the input current I of the A terminal of the triangular winding of the impedance matching balance transformer T1Is a transmission line LAThe current of (a) is one half of I; first high-power switching device SVG of power converter SC1Has an input current of I2Is a transmission line LAThe current of (a) is one half of I; second high-power switching device SVG of power converter SC2Output voltage U ofBAn input voltage U equal in magnitude to the input voltage U between the A terminal and the K terminal of the triangular winding of the impedance matching balancing transformer TASize; input voltage U between A terminal and K terminal of triangular winding of impedance matching balancing transformer TAAnd a second high-power switching device SVG of the power converter2Output voltage U ofBIs 90 °; the impedance matching balancing transformer T star winding and the low-voltage distribution network with the grounded neutral point are used for supplying a symmetrical three-phase power supply to the load requiring three-phase electric energy to operate.
Therefore, by the embodiment of the application, the transmission line L of the medium-neutral-point grounding low-voltage distribution networkAWhen two-phase circuit break lines or single-phase user three-phase power supply is used under the severe weather (such as storm) condition, under the condition that the power quality of a power grid allows, the emergency rescue operation of special or important three-phase load can be met, and power maintenance workers can set the system in the two-phase circuit break line position of the neutral point grounding low-voltage power distribution network, so that maintenance or rush repair can be carried out when the severe weather is finished or relieved. The embodiment of the application is suitable for places where only single-phase transmission lines are erected, and new three power supplies are erected due to the fact that three-phase power supplies are needed in emergency and in short timeThe phase line time is not allowed, and a three-phase power supply can be provided for a user under the condition that the power quality of the power grid is allowed.
Compared with the prior art, the method and the system have the advantages that the single-phase power transmission line is only erected in the low-voltage power distribution network with the grounded neutral point, the three-phase power supply is needed in an emergency short time, the time for erecting the new three-phase line is not allowed, and the three-phase power supply can be provided under the condition that the power quality of the power grid is allowed. The application provides a three-phase power supply, satisfies some special local power needs, if the user is more dispersed geographically, erects two-phase transmission line, and single-phase transformer inserts the user, and is more economical, does not take up an area of the place, but individual user needs three-phase electric power. When a three-phase user has two-phase disconnection, the method can provide three-phase electric energy, and the circuit is maintained after the storm stops, so that the possibility of larger accidents caused by emergency is reduced. In addition, the method and the device are good in universality and easy to implement.
Example two
As shown in fig. 1, the present embodiment provides a single-phase to three-phase power supply system based on an impedance matching balancing transformer, wherein the system includes a power transmission line LAA power converter SC and an impedance matching balancing transformer T; said transmission line LAThe power supply converter SC is connected with the impedance matching balance transformer T, the a terminal, the b terminal and the c terminal of the impedance matching balance transformer T are connected with a low-voltage distribution network with a grounded neutral point.
As shown in fig. 4, the main difference between the embodiment of the present application and the above-mentioned embodiment is: the K terminal and the C terminal of the T triangular winding of the impedance matching balancing transformer of the system pass through a return line LBIs connected to the Q terminal of the power converter SC. Other structures and features are the same as those of the first embodiment, and are not described herein again. In the embodiment of the present application, the return line LBAnd said transmission line LAAnd forming the two-phase power transmission line.
Therefore, by the embodiment of the application, the transmission line L of the medium-neutral-point grounding low-voltage distribution networkAIn bad weather (e.g. crazy storm rain)) Under the condition, when having a phase line broken string, under the circumstances that the electric wire netting electric energy quality allows, can satisfy special or important three-phase load's emergency rescue operation, the power maintenance staff can set up this application in a phase line broken string department of neutral point ground connection low voltage distribution network the system to the realization waits for bad weather to finish or repair or salvage when alleviating again. The embodiment of the application mainly aims at constructing a two-phase power transmission system to provide a three-phase power supply and meet the power utilization requirements of some special places. Such as: users are geographically dispersed to erect two-phase power transmission lines, and a first high-power switch device SVG1And a second high-power switch device SVG2The formed single-phase power converter is connected to a user, is relatively economical and does not occupy space, thereby realizing the requirement of three-phase power of the user.
To sum up, the circuit need not erect again when single-phase user needs three-phase electricity can not only be solved to this application, but also can solve the three-phase user and provide the three-phase electric energy when having one looks or two-phase broken string to avoid the risk of promptly bringing bigger occurence of failure because of the condition.
The present application has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to limit the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the presently disclosed embodiments and implementations thereof without departing from the spirit and scope of the present disclosure, and these fall within the scope of the present disclosure. The protection scope of this application is subject to the appended claims.
Claims (10)
1. A single-phase to three-phase power supply system based on an impedance matching balancing transformer, the system comprising: a power transmission line, a power converter connected to the power transmission line, and an impedance matching balancing transformer connected to the power transmission line and the power converter; the power transmission line is respectively connected to an A terminal of the triangular winding of the impedance matching balancing transformer and a P terminal of the power converter; and the B terminal of the triangular winding of the impedance matching balance transformer is connected with the M terminal of the power converter, and the a terminal, the B terminal and the c terminal of the star winding of the impedance matching balance transformer are connected with a low-voltage distribution network with a grounded neutral point.
2. The impedance-matching balancing transformer-based single-phase to three-phase power supply system according to claim 1, wherein the K and C terminals of the triangular winding of the impedance-matching balancing transformer are grounded, and the Q terminal of the power converter is grounded.
3. The impedance-matching balancing transformer-based single-phase to three-phase power supply system according to claim 1, wherein the K and C terminals of the triangular winding of the impedance-matching balancing transformer are connected to the Q terminal of the power converter through a return line.
4. The impedance-matching balancing transformer-based single-phase to three-phase power supply system according to claim 2 or 3, wherein the input current of the A terminal of the triangular winding of the impedance-matching balancing transformer is one-half of the current of the transmission line.
5. The impedance-matching balancing transformer-based single-phase to three-phase power supply system according to claim 2 or 3, wherein the power converter comprises a pulse width modulation controller, a first high power switch device, a second high power switch device connected in parallel with the first high power switch device, and an energy storage capacitor, the pulse width modulation controller is respectively connected with the first high power switch device and the second high power switch device, and the energy storage capacitor is respectively connected in parallel with the first high power switch device and the second high power switch device.
6. The impedance-matching balancing transformer-based single-phase to three-phase power supply system according to claim 5, wherein the input current of the first high power switching device of the power converter is I2 which is one-half of the current of the transmission line.
7. The impedance-matching balancing transformer-based single-phase to three-phase power supply system according to claim 5, wherein the magnitude of the output voltage of the second high power switching device of the power converter is equal to the magnitude of the input voltage between the A terminal and the K terminal of the delta winding of the impedance-matching balancing transformer.
8. The impedance-matching balancing transformer-based single-phase to three-phase power supply system according to claim 7, wherein a phase of an input voltage between the A terminal and the K terminal of the delta winding of the impedance-matching balancing transformer is 90 ° from a phase of an output voltage of the second high power switching device of the power converter.
9. The impedance-matching balancing transformer-based single-phase to three-phase power supply system according to claim 5, wherein the first high power switching device and the second high power switching device respectively comprise four high power transistors, and a control electrode of each high power transistor is connected to the pulse width modulation controller; and the emitter of any one high-power transistor of the first high-power switching device and the second high-power switching device is connected with the collector of any other high-power transistor in series to form a group of high-power transistor groups.
10. The impedance-matching balancing transformer-based single-phase to three-phase power supply system according to claim 9, wherein series points of an emitter and a collector of each group of high power transistors of the first high power switching device respectively constitute a P terminal and a Q terminal of a current input terminal of the first high power switching device; the series points of the emitter and the collector of each group of high-power transistor group of the second high-power switching device respectively form an M end and an N end of the current output of the second high-power switching device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911086002.6A CN110797871A (en) | 2019-11-08 | 2019-11-08 | Single-phase to three-phase power supply system based on impedance matching balance transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911086002.6A CN110797871A (en) | 2019-11-08 | 2019-11-08 | Single-phase to three-phase power supply system based on impedance matching balance transformer |
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| CN110797871A true CN110797871A (en) | 2020-02-14 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1819078A (en) * | 2006-03-02 | 2006-08-16 | 湖南大学 | Star-shaped and triangular grounding balancing voltage transformer with three-phase to two-phase and three-phase to three-phase |
| CN109672194A (en) * | 2018-12-20 | 2019-04-23 | 成都署信科技有限公司 | A kind of single-phase ac power supply system |
-
2019
- 2019-11-08 CN CN201911086002.6A patent/CN110797871A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1819078A (en) * | 2006-03-02 | 2006-08-16 | 湖南大学 | Star-shaped and triangular grounding balancing voltage transformer with three-phase to two-phase and three-phase to three-phase |
| CN109672194A (en) * | 2018-12-20 | 2019-04-23 | 成都署信科技有限公司 | A kind of single-phase ac power supply system |
Non-Patent Citations (1)
| Title |
|---|
| 欧阳帆: ""基于平衡变压器三相-单相变换供电方式研究"", 《中国博士学位论文全文数据库 工程科技II辑》 * |
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Application publication date: 20200214 |
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