CN110649609A - Single-phase or two-phase-to-three-phase power supply structure using YNVd transformer - Google Patents
Single-phase or two-phase-to-three-phase power supply structure using YNVd transformer Download PDFInfo
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- CN110649609A CN110649609A CN201911085140.2A CN201911085140A CN110649609A CN 110649609 A CN110649609 A CN 110649609A CN 201911085140 A CN201911085140 A CN 201911085140A CN 110649609 A CN110649609 A CN 110649609A
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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
- 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
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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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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- 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
- H02M5/40—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 with intermediate conversion into dc
- H02M5/42—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 with intermediate conversion into dc by static converters
- H02M5/44—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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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)
- Power Engineering (AREA)
- Ac-Ac Conversion (AREA)
Abstract
The invention discloses a single-phase or two-phase to three-phase power supply structure using an YNVd transformer, and relates to the technical field of power supply and distribution of a power grid. The input end of the power converter is connected with a power transmission line, terminals B and C of an YNVd transformer are respectively connected with terminals M and N in the output end of the power converter, a v-type winding in the YNVd transformer is connected with the power transmission line, when the power transmission line is a single-phase power transmission line, a terminal P in the input end of the power converter is connected with the power transmission line, and a terminal Q in the input end of the power converter is grounded; a terminal in the YNVd transformer is connected with a power transmission line, and a K terminal is grounded; when the transmission line is a two-phase transmission line, the P terminal and the Q terminal in the input port of the power converter are respectively connected with the A-phase transmission line L of the transmission lineAB phase power transmission line LBConnecting; and a three-phase port of the YNVd transformer is used as an output port to provide three-phase power 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, 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 single-phase or two-phase to three-phase power supply structure utilizing an YNVd transformer, which can effectively solve the technical problem of providing three-phase power through a single-phase or two-phase power transmission line.
The purpose of the invention is realized by the following technical scheme: a single or two-to-three phase power supply configuration utilizing an YNvd transformer, the power supply configuration comprising: the power transmission line is respectively connected with the input end of the YNV transformer and the input end of the power converter, the B terminal and the C terminal of a triangular winding in the YNV transformer are respectively connected with the M terminal and the N terminal in the output end of the power converter, when the power transmission line is a single-phase power transmission line, the P terminal in the input end of the power converter is connected with the power transmission line, and the Q terminal in the input end of the power converter is grounded; a terminal of a V-shaped winding in the YNVd transformer is connected with a power transmission line, and a K terminal is grounded; when the transmission line is a two-phase transmission line, the P terminal and the Q terminal in the input port of the power converter are respectively connected with the A-phase transmission line L of the transmission lineAB phase power transmission line LBConnecting; a terminal and K terminal in YNVd transformer are respectively connected with A phase power line L of power lineAB phase power transmission line LBConnecting; and the three-phase ports a, b and c of the star winding of the YNVd transformer are used as output ports to provide three-phase power for users.
The power converter 3 comprises a first high-power switching device SVG1 on a rectifying side, a second high-power switching device SVG2 on an inverting side, a direct-current energy storage capacitor Ca and a pulse width modulator, wherein the first high-power switching device SVG1 and the second high-power switching device SVG2 are connected in series, and the direct-current energy storage capacitor Ca is connected between connection points of the first high-power switching device SVG1 and the second high-power switching device SVG2 and used for providing voltage support between an emitter E and a collector j of the first high-power switching device and the second high-power switching device; the output end of the pulse width modulator is respectively connected with the control electrode G of the first high-power switching device SVG1 and the second high-power switching device SVG 2.
The first high-power switching device SVG1 comprises four high-power transistors BG, and the control electrode G of each high-power transistor BG is connected with the output end of the pulse width modulator; every two high-power transistors BG are connected in series with the collector j of another high-power transistor BG through the emitter E of one high-power transistor BG to form a group of high-power transistor groups, the emitters E of the two groups of high-power transistor groups are connected in pairs, and the collectors j are also connected in pairs; the series points of the emitter E and the collector j in the two groups of high-power transistor groups form a current input end P and an input end Q of a first high-power switching device SVG 1.
The second high-power switching device SVG2 comprises four high-power transistors BG, and the control electrode of each high-power transistor BG is connected with the output end of the pulse width modulator; every two high-power transistors BG are connected in series with a collector j through an emitter E to form a group of high-power transistor groups, the emitters E of the two groups of high-power transistor groups are connected in pairs, and the collectors j are also connected in pairs; the series points of the emitter E and the collector j in the two groups of high-power transistor groups form the current output end of a second high-power switching device SVG2, namely the M terminal and the N terminal of the output end of the power converter (3).
The input current of a first high-power switching device SVG1 of the power converter is equal to one half of the input current in the power transmission line; the input voltage UB between the B and C terminals of the triangular winding in the YNvd transformer is equal in magnitude to the input voltage UA between the a and K terminals of the V-shaped winding in the YNvd transformer, and the phases are at 90 degrees to each other.
The high-power transistor BG adopts an integrated gate commutated thyristor or an insulated gate bipolar thyristor.
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 diagram of the power converter of the present invention.
Fig. 4 is a connection diagram showing a specific structure of the power supply structure 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 (pulse width modulator) is adopted, the digital output of the microprocessor is utilized to carry out an analog control mode on the analog circuit, and 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 to realize the change of the conduction time of the transistor or the MOS tube, thereby realizing the change of the output of the switching stabilized voltage power supply.
Let the current of the transmission line 1 be I, YNvd input current I of terminal A of the transformer 21The input current of the first high-power switching device SVG1 is I2The input voltage between the A terminal and the K terminal in the YNVd transformer 2 is UAThe input voltage between a terminal B and a terminal C in a triangular winding of the YNVd transformer 2 is UB(ii) a Controlling input current I of first high-power switching device SVG1 by pulse width modulator2For transmitting electricityLine LAIs one half of the current I of (a); input voltage U between terminal B and terminal C in YNVd transformer 2BAnd input voltage U between A terminal and K terminal in YNVd transformer 2AThe YNVd transformer 2 has the same size and 90-degree phases, and the output end of the YNVd transformer provides symmetrical three-phase power supplies through ports a, b and c so as to be operated by loads needing three-phase electric energy.
Example one
As shown in fig. 1, the embodiment of the present invention provides a single-phase or two-phase to three-phase power supply configuration using an YNvd transformer, which includes a power line 1, an YNvd transformer 2, and a power converter 3. The power transmission line 1 is used for carrying out current transmission on an YNVd transformer 2 and a power converter 3; the YNVd 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 a user; the power converter 3 is used for converting the shunted current in the power transmission line 1 and supplying power to the YNVd transformer 2; the power transmission line 1 is respectively connected with a power converter 3 and an YNVd transformer 2, the power converter 3 is connected with the YNVd transformer 2, and the output end of the YNVd transformer 2 provides a three-phase power supply for a user backwards.
As shown in fig. 2 and 3, a 220V power transmission line 1 of the neutral-grounded power grid is a single-phase power transmission line and has a current I, and the power transmission line 1 is connected to an a terminal of an YNvd transformer 2 and a P terminal of a power converter 3, respectively; the current magnitude of A terminal of power transmission line 1 input YNVd transformer 2 is I1The magnitude of the current input to the P terminal of the power converter 3 is I2(ii) a The K terminal in the YNVd transformer 2 is grounded; 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 first high-power switching device SVG1 and the second high-power switching device SVG2 are connected in series, and a direct-current energy storage capacitor Ca is arranged between the connection points of the first high-power switching device SVG1 and the second high-power switching device SVG2 in parallel; the direct current energy storage capacitor is used for providing voltage support for an emitter E and a collector j of the first high-power switching device and the second high-power switching device; the control electrodes G of the first high-power switching device SVG1 and the second high-power switching device SVG2 are both connected with the output end of the pulse width modulator 4; q terminal of power converter 3The M terminal and the N terminal of the power converter 3 are respectively and correspondingly connected with a B terminal and a C terminal in the YNVd transformer 2; three-phase sides a, b and c of the YNVd transformer 2 provide three-phase symmetrical power for users.
Wherein, the input current I2 of the first high-power switch device SVG1 in the power converter 3 is a power transmission line LAIs one half of the current I of (a); input voltage U between terminal B and terminal C in YNVd transformerBInput voltage U between A terminal and K terminal in YNVd transformerAEqual in magnitude and 90 degrees in phase to each other.
In the embodiment of the invention, the first high-power switching device SVG1 comprises four high-power transistors BG, and a control electrode of each high-power transistor BG is connected with an output end of the pulse width modulator 4; every two high-power transistors BG are connected in series with the collector j of another high-power transistor BG through the emitter E of one high-power transistor BG to form a group of high-power transistor groups, the emitters E of the two groups of high-power transistor groups are connected in pairs, and the collectors j are also connected in pairs; the series points of the emitter E and the collector j in the two groups of high-power transistor groups form a current input end P and an input end Q of a first high-power switching device SVG 1. Emitters E which are not connected in series in the two groups of high-power transistors in the first high-power switching device SVG1 are connected with collectors j which are not connected in series in the two groups of high-power transistors in the first high-power switching device SVG 1.
In the embodiment of the invention, the second high-power switching device SVG2 has the same structure as the first high-power switching device SVG1, the second high-power switching device SVG2 comprises four high-power transistors BG, and the control electrode G of each high-power transistor BG is connected with the output end of the pulse width modulator 4; every two high-power transistors BG are connected in series with the collector j of another high-power transistor BG through the emitter E of one high-power transistor BG to form a group of high-power transistor groups, the emitters E of the two groups of high-power transistor groups are connected in pairs, and the collectors j are also connected in pairs; the series points of the emitter E and the collector j in the two groups of high-power transistor groups form the current output end of the second high-power switching device SVG2, namely the output end M terminal and the output end N terminal of the power converter 3. Emitters E which are not connected in series in two groups of high-power transistors in the second high-power switching device SVG2 are connected, and collectors j which are not connected in series in two groups of high-power transistors in the second high-power switching device SVG2 are connected.
In the embodiment of the invention, the second high-power switch device SVG2 is connected with the first high-power switch device SVG1 back to back, and a direct-current energy storage capacitor Ca is connected between the second high-power switch device SVG2 and the first high-power switch device SVG 1.
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 single-phase or two-phase to three-phase power supply structure using the YNvd 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, an YNvd transformer 2 and a power converter 3. The power transmission line 1 is used for carrying out current transmission on an YNVd transformer 2 and a power converter 3; the YNVd 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 a user; the power converter 3 is used for converting the shunted current in the power transmission line 1 and supplying power to the YNVd transformer 2; wherein power transmission line 1 is connected with power converter 3, YNVd transformer 2 respectively, and power converter 3 links to each other with YNVd transformer 2, and YNVd transformer 2 provides three-phase power for the user backward.
In the embodiment of the present invention, the structures of the first high-power switching device SVG1, the second high-power switching device SVG2, and the dc energy storage capacitor Ca in the power converter 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 therefore, 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 single-phase or two-phase to three-phase power supply structure using an YNvd transformer according to an embodiment of the present invention is implementedExample one differs in that the transmission line 1 described in the present example is a two-phase transmission line; l in two-phase transmission linesA、LBVoltage between them is 220V, input current in power line 1 is I, L in power line 1ARespectively connected to terminal A of YNVd transformer 2 and terminal P of power converter 3, and the current input to terminal A of YNVd transformer 2 is I1The magnitude of the current input to the P terminal of the power converter 3 is I2(ii) a L in a transmission line 1BA K terminal in the YNVd transformer 2 and a Q terminal of the power converter 3 are respectively connected; 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 first high-power switching device SVG1 and the second high-power switching device SVG2 are connected in series, a direct-current energy storage capacitor Ca is arranged between the first high-power switching device SVG and the second high-power switching device SVG in parallel and used for providing voltage support for an emitter E and a collector j of the first high-power switching device and the second high-power switching device, and control electrodes G of the first high-power switching device SVG1 and the second high-power switching device SVG2 are connected with the pulse width modulator 4; the M terminal and the N terminal of the output end of the power converter 3 are respectively and correspondingly connected with the B terminal and the C terminal in the YNVd transformer 2; three-phase sides a, b and c of the YNVd transformer 2 provide three-phase symmetrical power for users.
FIG. 5 is a pulse width modulator control flow diagram in which the input current I of the first high power switching device SVG1 in the power converter 32Is a transmission line LAIs one half of the current I of (a); input voltage U between terminal B and terminal C in YNVd transformerBInput voltage U between A terminal and K terminal in YNVd transformerAEqual in magnitude and 90 degrees in phase to each other.
Claims (6)
1. A single or two-to-three phase power supply configuration utilizing an YNvd transformer, the power supply configuration comprising: power transmission line (1), YNVd transformer (2) and power converter (3), power transmission line (1) links to each other its characterized in that with the input of YNVd transformer (2), the input of power converter (3) respectively: the terminals B and C of the triangular winding in the YNVd transformer (2) are respectively connected with the terminals M and N in the output end of the power converter (3), when the power transmission line (C)1) When the power transmission line is a single-phase power transmission line, a P terminal in the input end of the power converter (3) is connected with the power transmission line (1), and a Q terminal in the input end of the power converter is grounded; a terminal of a V-shaped winding in the YNVd transformer (2) is connected with the power transmission line (1), and a K terminal is grounded; when the power transmission line (1) is a two-phase power transmission line, the P terminal and the Q terminal of the input port of the power converter (3) are respectively connected with the A-phase power transmission line L of the power transmission line (1)AB phase power transmission line LBConnecting; a terminal and K terminal of YNVd transformer (2) are respectively connected with A phase power line L of power line (1)AB phase power transmission line LBConnecting; the three-phase ports a, b and c of the star winding of the YNVd transformer (2) are used as output ports to provide three-phase power for users.
2. The single-phase or two-phase to three-phase power supply structure using the YNVd transformer as claimed in claim 1, wherein: the power converter (3) comprises a first high-power switching device SVG1 on a rectifying side, a second high-power switching device SVG2 on an inverting side, a direct-current energy storage capacitor Ca and a pulse width modulator (4), wherein the first high-power switching device SVG1 and the second high-power switching device SVG2 are connected in series, and the direct-current energy storage capacitor Ca is connected between connection points of the first high-power switching device SVG1 and the second high-power switching device SVG2 and used for providing voltage support between an emitter E and a collector j of the first high-power switching device and the second high-power switching device; the output end of the pulse width modulator (4) is respectively connected with the control electrode C of the first high-power switching device SVG1 and the second high-power switching device SVG 2.
3. The single-phase or two-phase to three-phase power supply structure using the YNVd transformer as claimed in claim 2, wherein: the first high-power switching device SVG1 comprises four high-power transistors BG, and the control electrode G of each high-power transistor BG is connected with the output end of the pulse width modulator (4); every two high-power transistors BG are connected in series with the collector j of another high-power transistor BG through the emitter E of one high-power transistor BG to form a group of high-power transistor groups, the emitters E of the two groups of high-power transistor groups are connected in pairs, and the collectors j are also connected in pairs; the series points of the emitter E and the collector j in the two groups of high-power transistor groups form a current input end P and an input end Q of a first high-power switching device SVG 1.
4. The single-phase or two-phase to three-phase power supply structure using the YNVd transformer as claimed in claim 2, wherein: the second high-power switching device SVG2 comprises four high-power transistors BG, and the control electrode G of each high-power transistor BG is connected with the output end of the pulse width modulator (4); every two high-power transistors BG are connected in series with a collector j through an emitter E to form a group of high-power transistor groups, the emitters E of the two groups of high-power transistor groups are connected in pairs, and the collectors j are also connected in pairs; the series points of the emitter E and the collector j in the two groups of high-power transistor groups form a current output end of a second high-power switching device SVG2, and an M terminal and an N terminal of an output end of the power converter (3).
5. The single-phase or two-phase to three-phase power supply structure using the YNVd transformer as claimed in claim 2, wherein: the input current of a first high-power switching device SVG1 of the power converter (3) is equal to one half of the input current of the power transmission line (1); input voltage U between terminal B and terminal C of triangular winding in YNVd transformer (2)BAnd an input voltage U between the A terminal and the K terminal of a V-shaped winding in the YNVd transformer (2)AEqual in magnitude and 90 degrees in phase to each other.
6. A single phase or two-to-three phase power supply configuration using YNvd transformer as claimed in claim 3, wherein: the high-power transistor BG adopts an integrated gate commutated thyristor or an insulated gate bipolar thyristor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111431171A (en) * | 2020-03-24 | 2020-07-17 | 云南电网有限责任公司电力科学研究院 | Low-voltage uninterrupted two-phase-to-three-phase device and method |
| CN112217206A (en) * | 2020-10-12 | 2021-01-12 | 云南电网有限责任公司电力科学研究院 | Self-adaptive two-phase-to-three-phase power supply device |
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2019
- 2019-11-08 CN CN201911085140.2A patent/CN110649609A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111431171A (en) * | 2020-03-24 | 2020-07-17 | 云南电网有限责任公司电力科学研究院 | Low-voltage uninterrupted two-phase-to-three-phase device and method |
| CN111431171B (en) * | 2020-03-24 | 2023-09-08 | 云南电网有限责任公司电力科学研究院 | Device and method for changing low-voltage uninterrupted power supply into two phases and three phases |
| CN112217206A (en) * | 2020-10-12 | 2021-01-12 | 云南电网有限责任公司电力科学研究院 | Self-adaptive two-phase-to-three-phase power supply device |
| CN112217206B (en) * | 2020-10-12 | 2023-10-13 | 云南电网有限责任公司电力科学研究院 | Self-adaptive two-phase to three-phase power supply device |
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