CN210608538U - 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 PDF

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CN210608538U
CN210608538U CN201921918707.5U CN201921918707U CN210608538U CN 210608538 U CN210608538 U CN 210608538U CN 201921918707 U CN201921918707 U CN 201921918707U CN 210608538 U CN210608538 U CN 210608538U
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power
phase
terminal
transmission line
switching device
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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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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract

The utility model discloses an utilize single-phase or double-phase three-phase power supply structure that changes of YNVd transformer relates to power grid power supply and distribution technical field. The input end of the power converter is connected with the power transmission line, terminals B and C of the 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, and when the power transmission line is single-phase power transmissionWhen the power supply is on line, a P terminal in the input end of the power supply converter is connected with the power transmission line, and a Q terminal in the input end of the power supply 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

Single-phase or two-phase-to-three-phase power supply structure using YNVd transformer
Technical Field
The utility model relates to an electric power electric wire netting power supply and distribution technical field.
Background
In the ac power supply system of the power system, a three-phase ac power supply system is widely used. In the field of low-voltage power distribution in China, single-phase power transmission lines are generally erected to provide electric energy for users, users are geographically dispersed in partial regions, and a two-phase power transmission line mode is also adopted to provide electric energy for users. When a user who only accesses a single-phase or two-phase power transmission line needs to use a three-phase power supply, according to the prior art, only the three-phase power transmission line can be re-erected to provide the three-phase power supply for the user, and the method is long in time consumption, high in cost and low in economical efficiency.
Meanwhile, the transmission line is generally erected outdoors, so that the regional span is wide, the environmental conditions are variable, and various line breakage faults are generated due to the long-term mechanical force, the action of electromagnetic force, the thermal effect, serious oxidation, poor contact and the like, so that the equipment cannot normally operate. When the original three-phase transmission line has one or two-phase line break faults due to external reasons, the three-phase power supply mode is changed into a non-three-phase power supply mode, so that a three-phase power supply required by a user cannot be provided for the user. The existing solution can only provide a three-phase power supply in a short time through the economic rush repair of power maintenance personnel, and has great danger when the rescue is carried out in severe weather, so that the personal safety of the power maintenance personnel is difficult to ensure.
If the single-phase or two-phase power transmission line can be converted into a three-phase power supply mode through a simpler power equipment structure under the condition that the power quality of a power grid is allowed, a user can obtain a three-phase power supply at a lower cost in a shorter time, the cost input of a power transmission facility can be saved, the emergency supply of the three-phase power supply can be realized when the three-phase power transmission line is broken, the emergency maintenance of power maintenance personnel under the severe environment condition is avoided, and the personal safety of the power maintenance personnel is guaranteed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an utilize single-phase or double-phase to change three-phase power supply structure of YNVd transformer, it can solve effectively and provide three phase power's technical problem through single-phase or double-phase power transmission line.
The purpose of the utility model is realized through 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; input voltage U between B terminal and C terminal of triangular winding in YNVd transformerBAnd input voltage U between A terminal and K terminal of V-shaped winding in YNVd transformerAEqual in magnitude and 90 degrees in phase 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 utility model discloses the beneficial effect of technique is:
firstly, in the place where only a single-phase transmission line with a grounded neutral point is erected in a power distribution network, because a three-phase power supply is needed in an emergency and the time for erecting a new three-phase line is not allowed, under the condition that the electric energy quality of the power distribution network is allowed, the three-phase power supply can be provided through the power supply structure of the utility model;
secondly, in the place where only two-phase power transmission lines are erected in the power distribution network, because three-phase power is needed in an emergency and short time, the time for erecting a new three-phase line is not allowed, and under the condition that the power quality of the power distribution network is allowed, the three-phase power can be provided through the power supply structure of the utility model;
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 the specific structure of the present invention.
Fig. 3 is a schematic structural diagram of the power converter of the present invention.
Fig. 4 is a connection diagram of the specific structure of the power supply structure 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 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 21First high-power switchThe input current of the 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 modulator2Is a transmission line 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 structure using an YNvd transformer, which 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; 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 storage is arranged between the connection points of the first high-power switching device SVG1 and the second high-power switching device SVG2 in parallelAn energy capacity Ca; 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; the Q terminal of the power converter 3 is grounded, and the M terminal and the N terminal of the power converter 3 are correspondingly connected with the B terminal and the C terminal of the YNVd transformer 2 respectively; three-phase sides a, b and c of the YNVd transformer 2 provide three-phase symmetrical power for users.
Wherein, the input current I of the first high-power switch device SVG1 in the power converter 32Is a transmission line LAIs one half of the current I of (a); input voltage U between terminal B and terminal C in YNVd transformerBInput voltage U between A terminal and K terminal in YNVd transformerAEqual in magnitude and 90 in phase with each other.
In the embodiment of the present invention, the first high-power switching device SVG1 includes four high-power transistors BG, and a control electrode of each high-power transistor BG is connected to an output terminal 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 present 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 includes four high-power transistors BG, and the control electrode G of each high-power transistor BG is connected to 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.
The embodiment of the utility model provides an in, second high power switch device SVG2 is connected back to back with first high power switch device SVG1, inserts direct current energy storage electric capacity Ca between.
The high-power transistor BG shown in fig. 4 is an integrated gate commutated thyristor IGCT; in practical implementation, an insulated gate bipolar transistor IGBT may also be used.
Example two
The embodiment of the utility model provides an utilize single-phase or double-phase three-phase power supply structure that changes of YNVd transformer and the aforesaid the utility model provides an elementary structure is the same, as shown in FIG. 1 promptly, this power supply structure mainly includes power transmission line 1, YNVd transformer 2 and 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.
The embodiment of the utility model provides an in power converter 3 in first high power switch device SVG1 the structure of second high power switch device SVG2 and direct current energy storage electric capacity Ca and the connected mode between the three with above-mentioned utility model embodiment one in as shown in figure 3 the structure identical, so this no longer give unnecessary details.
In the embodiment of the utility model, the high-power transistor BG in the embodiment of the utility model is an integrated gate commutated thyristor IGCT; in practical implementation, the high-power transistor BG may also adopt an insulated gate bipolar transistor IGBT.
With reference 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 different in that the power transmission line 1 according to an embodiment of the present invention is a two-phase power 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.
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.

Claims (6)

1. A single-phase or two-phase to three-phase power supply structure using YNVd transformer,the power supply structure includes: 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 B terminal and the C terminal of a triangular winding in the YNVd transformer (2) are respectively connected with the M terminal and the N terminal in the output end of the power converter (3), when the power transmission line (1) is a single-phase power transmission line, the P terminal in the input end of the power converter (3) is connected with the power transmission line (1), 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 (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)AThe B phase power transmission line LB is connected; 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); an input voltage UB between a terminal B and a terminal C of a triangular winding in the YNV transformer (2) and an input voltage UA between a terminal A and a terminal K of a V-shaped winding in the YNV transformer (2) are equal in magnitude and are 90 degrees in phase with 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.
CN201921918707.5U 2019-11-08 2019-11-08 Single-phase or two-phase-to-three-phase power supply structure using YNVd transformer Active CN210608538U (en)

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CN201921918707.5U CN210608538U (en) 2019-11-08 2019-11-08 Single-phase or two-phase-to-three-phase power supply structure using YNVd transformer

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Application Number Priority Date Filing Date Title
CN201921918707.5U CN210608538U (en) 2019-11-08 2019-11-08 Single-phase or two-phase-to-three-phase power supply structure using YNVd transformer

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