CN110661262A - Three-phase power supply structure of single three-phase combined transformer - Google Patents

Three-phase power supply structure of single three-phase combined transformer Download PDF

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Publication number
CN110661262A
CN110661262A CN201911085333.8A CN201911085333A CN110661262A CN 110661262 A CN110661262 A CN 110661262A CN 201911085333 A CN201911085333 A CN 201911085333A CN 110661262 A CN110661262 A CN 110661262A
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CN
China
Prior art keywords
phase
terminal
transformer
power
transmission line
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Pending
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CN201911085333.8A
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Chinese (zh)
Inventor
易东
李群湛
黄小红
解绍锋
郭锴
张丽艳
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Southwest Jiaotong University
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Southwest Jiaotong University
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Priority to CN201911085333.8A priority Critical patent/CN110661262A/en
Publication of CN110661262A publication Critical patent/CN110661262A/en
Pending legal-status Critical Current

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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
    • 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
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
    • 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
    • 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

Abstract

The invention discloses a three-phase power supply structure of a single three-phase combined transformer, and relates to the technical field of power supply and distribution of a power grid. The power transmission line is respectively connected with the single three-phase combined transformer and the three-phase static var generator; the single-three-phase combined transformer comprises a single-phase transformer T1 and a three-phase transformer T2, wherein a u terminal in an output port of the single-phase transformer T1 is connected with a b-phase line on the three-phase output side of the three-phase transformer T2, and a v terminal in an output port of the single-phase transformer T1 is connected with a c-phase line on the three-phase output side of the three-phase transformer T2; the B terminal and the C terminal of the input end of the three-phase transformer T2 are respectively connected with the M terminal and the N terminal of the output end of the three-phase static var generator, and the N terminal of the three-phase static var generator is connected with the K terminal of the single-phase transformer T1; and the a, b and c three-phase ports of the single three-phase combined transformer are used as output ports to provide three-phase power for users.

Description

Three-phase power supply structure of single three-phase combined transformer
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, 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.
Disclosure of Invention
The invention aims to provide a three-phase power supply structure of a single three-phase combined transformer, which can effectively solve the technical problem that a single-phase or two-phase power transmission line provides three-phase power.
The purpose of the invention is realized by the following technical scheme: a single three-phase combined transformer three-phase power supply configuration, the power supply configuration comprising: the power transmission line is respectively connected with the single three-phase combined transformer and the three-phase static var generator; the single-three-phase combined transformer comprises a single-phase transformer T1 and a three-phase transformer T2, wherein a u terminal in an output port of the single-phase transformer T1 is connected with a b-phase line on the three-phase output side of the three-phase transformer T2, and a v terminal in an output port of the single-phase transformer T1 is connected with a c-phase line on the three-phase output side of the three-phase transformer T2; the B terminal and the C terminal of the input end of the three-phase transformer T2 are respectively connected with the M terminal and the N terminal of the output end of the three-phase static var generator, and the N terminal of the three-phase static var generator is connected with the K terminal of the single-phase transformer T1; and the a, b and c three-phase ports of the single three-phase combined transformer are used as output ports to provide three-phase power for users.
When the power transmission line is a single-phase power transmission line, the power transmission line is respectively connected with an A terminal in the primary side input end of the single three-phase combined transformer and a P terminal in the output end of the three-phase static var generator; and the N terminal in the three-phase static var generator is grounded.
When the power transmission line is a two-phase power transmission line, the A-phase power transmission line L in the power transmission lineAThe three-phase static var generator is respectively connected with an A terminal in the primary side input end of the single three-phase combined transformer and a P terminal in the output end of the three-phase static var generator; n terminal in input port of three-phase static var generator and B-phase transmission line L in transmission lineBAre connected.
The three-phase static var generator comprises six high-power transistors BG, a direct-current energy storage capacitor and a pulse width modulator CP; every two high-power transistors BG are connected in series with the collector of another high-power transistor BG through the emitter of one high-power transistor BG to form a group of high-power transistor groups; the series points of the emitting electrodes and the collecting electrodes in the three groups of high-power transistor groups form the external P terminal, M terminal and N terminal of the three-phase static var generator; three groups of high-power transistor groups are connected in parallel, the connection point of an emitting electrode is a point e, the connection point of a collecting electrode is a point f, and a direct-current energy storage capacitor is connected between the point e and the point f in parallel; the control stage of each high-power transistor BG is connected with the output end of the pulse width modulator CP.
Input current I of the three-phase static var generator2Is half of the current I of the transmission line; input voltage U in three-phase transformer T2BAnd the input voltage U in the single-phase transformer T1AEqual in magnitude and 90 degrees in phase to each other; input current I of B terminal in single three-phase combined transformerBEqual to input current I of three-phase static var generator2。
The high-power transistor BG adopts an integrated gate commutated thyristor or an insulated gate bipolar transistor.
Compared with the prior art, the technology of the invention has the beneficial effects that:
the method comprises the following steps that firstly, in a place where only a single-phase power transmission line with a neutral point grounded is erected in a power distribution network, as a three-phase power supply is needed in an emergency and the erection time of a new three-phase line is not allowed, under the condition that the power quality of the power distribution network is allowed, the three-phase power supply can be provided through the power supply structure;
secondly, in the place where only two-phase transmission lines are erected in the power distribution network, because three-phase power 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 can be provided through the power supply structure;
and thirdly, when one phase or two phases of the three-phase user are disconnected, and the maintenance environment is severe at that time, three-phase electric energy can be provided by the method, and the line is maintained after the weather environment is improved, so that potential safety hazards possibly existing in outdoor emergency repair of power maintenance personnel are reduced, and the possibility of larger accidents caused by emergency situations is also reduced.
Fourthly, the structure is simple, the universality is good, the economical efficiency is good, and the implementation is easy.
Drawings
Fig. 1 is a schematic diagram of the basic structure of the present invention.
Fig. 2 is a connection diagram of 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 pulse width modulator 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 three-phase combined transformer 21Input current I of terminal B in single-three phase combined transformer 2BThe P terminal input current of the three-phase static var generator 3 is I2The input voltage between the A terminal and the K terminal in the single three-phase combined transformer 2 is UAAnd the input voltage between the B terminal and the C terminal in the single three-phase combined transformer 2 is UB(ii) a Input current I of P terminal in three-phase static var generator 32For A phase transmission line LAIs one half of the current I, the input current I of the B terminal in the single three-phase combined transformer 2BInput current I to P terminal of three-phase static var generator 32Equal in size; input voltage U between B terminal and C terminal of three-phase transformerBAnd the input voltage U between the A terminal and the K terminal of the single-phase transformerAEqual in size and 90 degrees in phase with each other, the three-phase side of the single three-phase combined transformer 2 is operated by providing a symmetrical three-phase power supply for a load requiring three-phase power.
Example one
As shown in fig. 1, the embodiment of the present invention provides a three-phase power supply configuration of a single three-phase combined transformer, which includes a power transmission line 1, a single three-phase combined transformer 2 and a three-phase static var generator 3. The power transmission line 1 is used for carrying out current transmission on the single three-phase combined transformer 2 and the three-phase static var generator 3; the single-three phase combined transformer 2 is formed by connecting a single-phase transformer T1 and a three-phase transformer T2, and is used for transforming and phase modulating the current provided by the power transmission line 1 and the three-phase static var generator 3 and then providing a symmetrical three-phase power supply for users; the three-phase static var generator 3 is used for converting the shunted current in the power transmission line 1 and supplying power to the single three-phase combined transformer 2; the power transmission line 1 is respectively connected with a three-phase static var generator 3 and a single three-phase combined transformer 2, the three-phase static var generator 3 is connected with the single three-phase combined transformer 2, and the three-phase side of the single three-phase combined transformer 2 provides three-phase power for users.
As shown in fig. 2 and fig. 3, the 220V transmission line 1 of the neutral point grounding grid is a single-phase transmission line and the current is I, and the transmission line 1 is respectively connected to the a terminal of the single three-phase combined transformer 2 and the P terminal of the three-phase static var generator 3; the current magnitude of the A terminal of the power transmission line 1 input into the single three-phase combined transformer 2 is I1The magnitude of the current input to the P terminal of the three-phase static var generator 3 is I2(ii) a The K terminal of the single three-phase combined transformer 2 is connected with the N terminal of the three-phase static var generator 3 and then grounded; the three-phase static var generator 3 comprises six high-power transistors BG, a direct-current energy storage capacitor and a pulse width modulator CP; every two high-power transistors BG are connected in series with the collector of another high-power transistor BG through the emitter of one high-power transistor BG to form a group of high-power transistor groups; the three groups of high-power transistor groups are connected in parallel, the connection point of the emitter is a point e, the connection point of the collector is a point f, and a direct-current energy storage capacitor is connected between the point e and the point f; the control stage of each high-power transistor BG is connected to the output end of the pulse width modulator CP. M of three-phase static var generator 3The terminals are correspondingly connected with the B terminals in the single three-phase combined transformer 2, and the N terminals of the three-phase static var generator 3 are correspondingly connected with the C terminals in the single three-phase combined transformer 2; the three-phase port sides a, b and c of the single three-phase combined transformer 2 provide three-phase symmetrical power supply for users.
The high-power transistor BG shown in FIG. 3 is an integrated gate commutated thyristor IGCT; in practical implementation, an insulated gate bipolar transistor IGBT may also be used.
Example two
The three-phase power supply structure of the single three-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 three-phase combined transformer 2, and a three-phase static var generator 3. The power transmission line 1 is used for carrying out current transmission on the single three-phase combined transformer 2 and the three-phase static var generator 3; the single three-phase combined transformer 2 is used for transforming and phase-modulating the current provided by the power transmission line 1 and the three-phase static var generator 3 and then providing a symmetrical three-phase power supply for users; the three-phase static var generator 3 is used for converting the shunted current in the power transmission line 1 and supplying power to the single three-phase combined transformer 2; the power transmission line 1 is respectively connected with a three-phase static var generator 3 and a single three-phase combined transformer 2, the three-phase static var generator 3 is connected with the single three-phase combined transformer 2, and the single three-phase combined transformer 2 provides three-phase power for users.
In the embodiment of the present invention, the structures of the six high-power transistors BG, the dc energy storage capacitor, and the pulse width modulator CP in the three-phase static var generator 3 and the connection manner among the three are completely the same as the structure 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 in the embodiment of the invention 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 three-phase power supply structure of a single three-phase combined transformer according to an embodiment of the present invention is disclosedThe difference between the first embodiment of the invention described above is that the transmission line 1 described in the embodiments is a two-phase transmission line; the control flow of the invention is shown in figure 5, L in a two-phase power transmission lineA、LBThe voltage between the two lines is 220V, the input current in the power transmission line 1 is I, and the A-phase power transmission line L in the power transmission line 1ARespectively connected to the A terminal of the single-three phase combined transformer 2 and the P terminal of the three-phase static var generator 3, and the current input to the A terminal of the single-three phase combined transformer 2 is I1The magnitude of the current input to the P terminal of the three-phase static var generator 3 is I2(ii) a B-phase transmission line L in transmission line 1BThe N terminal of the three-phase static var generator 3 is accessed; the M terminal and the N terminal of the three-phase static var generator 3 are respectively and correspondingly connected with the B terminal and the C terminal of the single three-phase combined transformer 2, and the K terminal of the single three-phase combined transformer 2 is connected with the N terminal of the three-phase static var generator 3; the three-phase sides a, b and c of the single three-phase combined transformer 2 provide three-phase symmetrical power supply for users.

Claims (6)

1. A single three-phase combined transformer three-phase power supply configuration, the power supply configuration comprising: the power transmission system comprises a power transmission line (1), a single three-phase combined transformer (2) and a three-phase static var generator (3), wherein the power transmission line (1) is respectively connected with the single three-phase combined transformer (2) and the three-phase static var generator (3); the method is characterized in that: the single-three-phase combined transformer (2) comprises a single-phase transformer T1 and a three-phase transformer T2, wherein a u terminal in an output port of the single-phase transformer T1 is connected with a b-phase line on the three-phase output side of the three-phase transformer T2, and a v terminal in an output port of the single-phase transformer T1 is connected with a c-phase line on the three-phase output side of the three-phase transformer T2; the B terminal and the C terminal of the input end of the three-phase transformer T2 are respectively connected with the M terminal and the N terminal of the output end of the three-phase static var generator (3), and the N terminal of the three-phase static var generator (3) is connected with the K terminal of the single-phase transformer T1; and the a, b and c three-phase ports of the single three-phase combined transformer (2) are used as output ports to provide three-phase power for users.
2. The three-phase power supply structure of the single three-phase combined transformer as claimed in claim 1, wherein: when the power transmission line (1) is a single-phase power transmission line, the power transmission line (1) is respectively connected with an A terminal in the primary side input end of the single three-phase combined transformer (2) and a P terminal in the output end of the three-phase static var generator (3); the N terminal in the three-phase static var generator (3) is grounded.
3. The three-phase power supply structure of the single three-phase combined transformer as claimed in claim 1, wherein: an A-phase power transmission line L in the power transmission line (1) when the power transmission line (1) is a two-phase power transmission lineAThe three-phase static var generator is respectively connected with an A terminal in the primary side input end of the single three-phase combined transformer (2) and a P terminal in the output end of the three-phase static var generator (3); n terminal in input port of three-phase static var generator (3) and B phase transmission line L in transmission line (1)BAre connected.
4. The three-phase power supply structure of the single three-phase combined transformer as claimed in claim 1, wherein: the three-phase static var generator (3) comprises six high-power transistors BG, a direct-current energy storage capacitor and a pulse width modulator CP; every two high-power transistors BG are connected in series with the collector of another high-power transistor BG through the emitter of one high-power transistor BG to form a group of high-power transistor groups; the series points of the emitting electrodes and the collecting electrodes in the three groups of high-power transistor groups form the external P terminal, M terminal and N terminal of the three-phase static var generator; three groups of high-power transistor groups are connected in parallel, the connection point of an emitting electrode is a point e, the connection point of a collecting electrode is a point f, and a direct-current energy storage capacitor is connected between the point e and the point f in parallel; the control stage of each high-power transistor BG is connected with the output end of the pulse width modulator CP.
5. The three-phase power supply structure of the single three-phase combined transformer as claimed in claim 1, wherein: input current I of three-phase static var generator (3)2Is half the current I of the transmission line (1); input voltage U in three-phase transformer T2BAnd the input voltage U in the single-phase transformer T1AEqual in magnitude and 90 degrees in phase to each other; b terminal in single three-phase combined transformer (2)Input current I of the sub-circuitBEqual to the input current I of the three-phase static var generator (3)2。
6. The three-phase power supply structure of the single three-phase combined transformer as claimed in claim 1, wherein: the high-power transistor BG adopts an integrated gate commutated thyristor or an insulated gate bipolar transistor.
CN201911085333.8A 2019-11-08 2019-11-08 Three-phase power supply structure of single three-phase combined transformer Pending CN110661262A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911085333.8A CN110661262A (en) 2019-11-08 2019-11-08 Three-phase power supply structure of single three-phase combined transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911085333.8A CN110661262A (en) 2019-11-08 2019-11-08 Three-phase power supply structure of single three-phase combined transformer

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CN110661262A true CN110661262A (en) 2020-01-07

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