CN207398830U - A kind of electric power electric transformer - Google Patents
A kind of electric power electric transformer Download PDFInfo
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- CN207398830U CN207398830U CN201721469115.0U CN201721469115U CN207398830U CN 207398830 U CN207398830 U CN 207398830U CN 201721469115 U CN201721469115 U CN 201721469115U CN 207398830 U CN207398830 U CN 207398830U
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- 230000005611 electricity Effects 0.000 claims abstract description 14
- 238000004146 energy storage Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 5
- 230000009466 transformation Effects 0.000 claims description 3
- 238000000844 transformation Methods 0.000 claims 1
- 230000001172 regenerating effect Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000002457 bidirectional effect Effects 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
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- 230000003137 locomotive effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
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Abstract
The utility model proposes a kind of electric power electric transformers, suitable for electric power supply system for subway, using the cascade mode of input, improve input voltage grade, medium-pressure electricity supply network 10kV/35kV can be directly matched, exports multiple isolated DC power supplys, directly feeds the traction contact net 1500V/750V electricity consumptions of metro traction power system, and the three-phase 220/380V power and lighting load electricity consumptions of subway power supply-distribution system, eliminate industrial frequency traction transformer and step-down transformer.The single phase ac DC converter mainly by rectification circuit, two-way DC DC translation circuits and forms.The utility model is few applied to electric power supply system for subway number of modules, and at low cost, simple in structure, controllability is strong, and operation and maintenance is convenient.When subway regenerative braking, the transmitted in both directions of energy being realized, feeding back to power grid electric energy up to standard, the cascade rectifier of input can realize two-way four-quadrant unity power factor operation, and there is no need to harmonic waves and reactive power compensator.
Description
Technical field
The utility model is related to urban distribution network medium-pressure electricity supply technical fields.
Background technology
At present, subway power supply power supply in China's comes from along subway line from urban distribution network and is introduced directly into subway or by subway
Voltage class of the special main transformer station's transformation needed for electric power supply system for subway, the country are generally 35kV 10kV voltage class.
Subway power supply is mainly made of two big systems：Tractive power supply system and power supply-distribution system.In one kind of the current generally use in China
It is mixed type middle-voltage network to press supply network, that is, is exactly that traction substation and stepdown substation use unified voltage class, shares
One medium-pressure electricity supply network.
Original metro traction power system is by tractive transformer and Rectification Power Factor, using direct current 1500V or 750V
It powers to Traction networks, the direct current after rectification is the pulsating direct current containing alternating component.Harmonic component therein can be by conducting coupling
It closes to other electric power, electronic equipment has adverse effect on.In order to inhibit the generation of harmonic wave, raising rectification pulse number is equivalent
24 pulse wave rectifiers.But rectification rapid pulse is more, rectifier transformer manufacture is more complicated, and cost is higher.Original subway power supply and distribution system
System, is made of two parts：Stepdown substation and power and lighting system.Low-pressure side uses 220/380V three-phase four-wire system TN-S systems
System.There are volume/mass is big, grid-connected impedance is small, dash current is big, easy resonance and makes an uproar for traditional industrial frequency traction and step-down transformer
The problems such as sound, seriously constrains the further promotion of subway speed, efficiency.
In view of the deficiencies in the prior art, to solve the above-mentioned problems, it is proposed that a kind of electricity applied to electric power supply system for subway
Power electronic transformer technology, the cascade rectifier of technology input can realize two-way four-quadrant unity power factor operation, because
This without harmonic wave and reactive power compensator and operating current it is controlled, add the stability of synchronization AC electric system with it is controllable
Property.The bidirectional DC-DC converter of isolation is isolated using medium/high frequency transformer, can generate the DC power supply of n isolation, forms system
One dc bus uses for subsequent inverter and DC-DC converter, therefore can supply electricity to subway traction power supply system simultaneously
System and power supply-distribution system two systems, while the tractive transformer and step-down transformer of power frequency are canceled, reach loss of weight and subtract volume
Purpose.
Utility model content
The purpose of this utility model is to provide a kind of electric power electric transformer, it can efficiently solve existing industrial frequency traction
The substitution problem of transformer and step-down transformer.The utility model solves its technical problem, and used technical solution is：
A kind of electric power electric transformer, middle pressure alternating current A phase, B phase, C phase are respectively hung oneself reactor LA, reactor LB, reactance
Device LC cascades n AC-DC converter A1, converter B1, converter C1 and picks out again, wherein n>1, form three-phase input port I；Respectively
The converter DC port of phase is in parallel, forms a dc bus；Dc bus is DC power supply, is become equipped with n DC-DC thereafter
Parallel operation or inverter, the transformer are integrated with n output port U1~Un, wherein n>1.
(1) first converter A1 of A phases branch1The positive port A1 of grid side1P is connected through reactor LA with three phase network A, A
First converter A1 of phase branch1Grid side negative terminal mouth A11N and second converter A12The positive port A1 of grid side2P phases
Even ..., (n-1)th converter A1n-1Grid side negative terminal mouth A1n-1N and n-th of converter A1nThe positive port A1 of grid sidenP
It is connected, the connection of B phase branch converter B1, C phase branch converters C1 is identical with A phases；N-th of converter of A phase, B phase, C phase
Grid side negative terminal mouth A1nN, negative terminal mouth B1nN, negative terminal mouth C1nN is commonly connected to N points.
(2) each phasing commutator DC port is in parallel, common DC bus, including two kinds of connections：
First connection one, A phases branch converter A11The positive port a of DC side1First converter B1 of P and B phases branch1
The positive port b of DC side1First converter C1 of P and C phases branch1The positive port c of DC side1P is connected, and is connecing dc bus just
Port, first converter A1 of A phases branch1, first converter B1 of B phases branch1, first converter C1 of C phases branch1It is straight
Flow side negative terminal mouth a1N, negative terminal mouth b1N and negative terminal mouth c1N is connected, and connects dc bus negative terminal mouth；Second converter A12, second
Converter B12, second converter C12... n-th of converter A1n, n-th of converter B1n, n-th of converter C1nDC side
First converter A1 of connection mode and A phases branch1, first converter B1 of B phases branch1, first converter C1 of C phases branch1
Connection mode is identical, and the output of A, B, C three-phase inverter DC side forms a dc bus port.
First connection two, A phases branch converter A11The positive port a of DC side1Second converter A1 of P and A phases branch2
The positive port a of DC side2N-th of converter A1 of P ... and A phases branchnThe positive port a of DC sidenP is connected, and connects dc bus
Positive port, first converter A1 of A phases branch1Positive DC side end mouth a1Second converter A1 of N and A phases branch2DC side
Negative terminal mouth a2N-th of converter A1 of N ... and A phases branchnPositive DC side end mouth anN is connected, and meets the negative terminal mouth of dc bus, B
The connection mode of phasing commutator B1, C phasing commutator C1 is identical with converter A1, A phase, B phase, C phase converter DC side output structure
Into a dc bus port.
The dc bus forms output port U directly as Traction networks nominal DC voltage 1500V or 750V1, supply
To the direct-current traction power supply network of subway.
Direct-flow input end mouth of the dc bus as three single-phase inverters, inverter output plus terminal mouth ap, anode
Mouth bp, positive port cp export negative terminal mouth an, negative terminal mouth bn, negative terminal mouth cn respectively as the positive port of low-voltage three-phase AC port
O points are commonly connected to, form the three-phase alternating current output port U of the 220/380V of a three-phase and four-line2, supply subway power photograph
Bright load electricity consumption.
Input port of the dc bus as bidirectional DC-DC converter, output port UnConnect energy-storage travelling wave tube accumulator
Or super capacitor is, it can be achieved that energy two-way transmission, the auxiliary power supply as subway.
Realize the utility model individual module be single phase ac-DC converter as shown in figure 4, the converter mainly by
Rectification circuit, bidirectional DC-DC converter circuit composition.Electronic power switch device in converter all uses PWM control modes.Its
The basic function of middle rectification circuit is the control by switch tube, and rectification is carried out to alternating voltage, realizes output DC voltage
It is adjustable；Transformer primary side bridge arm realizes that inversion function becomes function in bidirectional DC-DC converter, and DC voltage is reverse into exchange
Voltage supplies transformer, and Circuit Fault on Secondary Transformer bridge arm realizes rectification function, and the alternating current that transformer exports is become direct current, is produced
The dc bus of raw multiple isolation.The topology utilizes the characteristic of middle dc voltage isolation, and output can in parallel be unified stable
DC bus-bar voltage can also stand alone as inverter even load and provide isolated DC voltage.Multiple single phase ac-direct currents of each phase
The cascade of converter rectification side obtains the input of voltage levels.M1, M2 in Fig. 41、M22Can be three level, two level even
In addition more level and half-bridge, the combination of full-bridge can also have resonant network or resonance free net in bidirectional DC-DC converter circuit
Network.
The direct transformation of three-phase 10kV urban distribution networks is changed into Traction networks 1500V and low-voltage-powered lighting load electricity consumption three-phase
220/380V.During using the pressure-resistant switching tube of the electric power electric transformer technology and selection 3.3kV of three level of module, it is only necessary to
Cascade three modules can directly match exchange 10kV voltages, number of modules is few, at low cost, simple in structure, and controllability is strong, using with
It is easy to maintain.When traction locomotive is in regenerative braking, electric energy up to standard can be fed back to power grid, realizes the bidirectional flow of energy
It is dynamic.The DC port of output connects accumulator or super capacitor energy-storage element by bidirectional DC-DC converter, in metro braking
When, the excess energy of recycling metro braking generation, reducing energy loss prevents that supply conductor voltage fluctuation is too big.Start in subway
When, energy-storage travelling wave tube releases energy, and prevents supply conductor voltage from falling, and realizes the two-way flow of energy, ensures that supply conductor voltage is stablized.
So that the improved efficiency of whole system, can realize that unity power factor is run in power grid exchange side, be isolated using medium-high frequency and become
Depressor mitigates the volume and weight of system.
Compared with prior art, the utility model advantageous effect is：
1st, the utility model is the electric power electric transformer device applied in electric power supply system for subway, eliminates the traction of power frequency
Transformer and step-down transformer,, can be significantly compared with traditional Industrial Frequency Transformer system using medium/high frequency transformer (MFT)
The volume of mitigation system, and system controlled, simple in structure, operation and maintenance is convenient.
2nd, when traction locomotive is in regenerative braking, electric energy up to standard can be fed back to power grid, realizes the bidirectional flow of energy
It is dynamic.The DC port of output can connect accumulator or super capacitor energy-storage element by bidirectional DC-DC converter, ensure traction
Net voltage stabilization reduces loss, raising efficiency.
3rd, the cascade rectifier of input can realize two-way four-quadrant unity power factor operation and reduce existing electric power system
The use of harmonic wave and reactive power compensator improves power quality, increases the stability and controllability of synchronization AC electric system.
4th, the single phase ac per phase-DC converter improves input voltage grade using input cascade system.
Description of the drawings
Fig. 1 is 1 structure chart of the utility model circuit；
Fig. 2 is 2 structure chart of the utility model circuit；
Fig. 3 is three-phase alternating current-direct current power electronic transformer structure chart that the utility model is applied to electric power supply system for subway；
Fig. 4 is the realization single inverter scheme basic structure of the utility model.
Specific embodiment
Fig. 1,2,3 show the three of the utility model and intersect straight electric power electric transformer structure chart and its apply in subway confession
The structure chart of electric system.Fig. 4 is the single inverter scheme basic structure for realizing the utility model, in figure M1 be rectification circuit 3,
M21、M22Can be three level, the even more level of two level and half-bridge, full-bridge combination bidirectional DC-DC converter circuit 4, in addition
Can also have resonant network or resonance free network in bidirectional DC-DC converter circuit 4.A kind of specific implementation of the utility model
Mode is：
A kind of electric power electric transformer, middle pressure alternating current A phase, B phase, C phase are respectively hung oneself reactor LA, reactor LB, reactance
Device LC cascades n AC-DC converter A1, converter B1, converter C1 and picks out again, wherein n>1, form three-phase input port I；Respectively
The converter DC port of phase is in parallel, forms a dc bus；Dc bus is DC power supply, is become equipped with n DC-DC thereafter
Parallel operation or inverter, the transformer are integrated with n output port U1~Un, wherein n>1.
(1) first converter A1 of A phases branch1The positive port A1 of grid side1P is connected through reactor LA with three phase network A, A
First converter A1 of phase branch1Grid side negative terminal mouth A11N and second converter A12The positive port A1 of grid side2P phases
Even ..., (n-1)th converter A1n-1Grid side negative terminal mouth A1n-1N and n-th of converter A1nThe positive port A1 of grid sidenP
It is connected, the connection of B phase branch converter B1, C phase branch converters C1 is identical with A phases；N-th of converter of A phase, B phase, C phase
Grid side negative terminal mouth A1nN, negative terminal mouth B1nN, negative terminal mouth C1nN is commonly connected to N points.
(2) each phasing commutator DC port is in parallel, common DC bus, including two kinds of connections：
First connection one, A phases branch converter A11The positive port a of DC side1First converter B1 of P and B phases branch1
The positive port b of DC side1First converter C1 of P and C phases branch1The positive port c of DC side1P is connected, and is connecing dc bus just
Port, first converter A1 of A phases branch1, first converter B1 of B phases branch1, first converter C1 of C phases branch1It is straight
Flow side negative terminal mouth a1N, negative terminal mouth b1N and negative terminal mouth c1N is connected, and connects dc bus negative terminal mouth；Second converter A12, second
Converter B12, second converter C12... n-th of converter A1n, n-th of converter B1n, n-th of converter C1nDC side
First converter A1 of connection mode and A phases branch1, first converter B1 of B phases branch1, first converter C1 of C phases branch1
Connection mode is identical, and the output of A, B, C three-phase inverter DC side forms a dc bus port.
First connection two, A phases branch converter A11The positive port a of DC side1Second converter A1 of P and A phases branch2
The positive port a of DC side2N-th of converter A1 of P ... and A phases branchnThe positive port a of DC sidenP is connected, and connects dc bus
Positive port, first converter A1 of A phases branch1Positive DC side end mouth a1Second converter A1 of N and A phases branch2DC side
Negative terminal mouth a2N-th of converter A1 of N ... and A phases branchnPositive DC side end mouth anN is connected, and meets the negative terminal mouth of dc bus, B
The connection mode of phasing commutator B1, C phasing commutator C1 is identical with converter A1, and the output of A, B, C three-phase inverter DC side is formed
One dc bus port.
The dc bus forms output port U directly as Traction networks nominal DC voltage 1500V or 750V1, supply
To the direct-current traction power supply network of subway.
Direct-flow input end mouth of the dc bus as three single-phase inverters, inverter output plus terminal mouth ap, anode
Mouth bp, positive port cp export negative terminal mouth an, negative terminal mouth bn, negative terminal mouth cn respectively as the positive port of low-voltage three-phase AC port
O points are commonly connected to, form the three-phase alternating current output port U of the 220/380V of a three-phase and four-line2, supply subway power photograph
Bright load electricity consumption.
Input port of the dc bus as bidirectional DC-DC converter 4, output port UnConnect energy-storage travelling wave tube accumulator
2 or super capacitor 1, it can be achieved that energy two-way transmission, the auxiliary power supply as subway.It should be noted that converter
In rectification circuit, bidirectional DC-DC converter circuit 4 can be three level, the even more level of two level and half-bridge, the group of full-bridge
It closes, in addition can also have resonant network or resonance free network in 4 circuit of bidirectional DC-DC converter.
The utility model proposes a kind of electric power electric transformer devices suitable for electric power supply system for subway, are cascaded using input
Mode, improve input voltage grade, can directly match medium-pressure electricity supply network 10kV/35kV, export multiple isolated DCs
Power supply directly feeds the traction contact net 1500V/750V electricity consumptions of metro traction power system and subway power supply-distribution system
Three-phase 220/380V power and lighting load electricity consumptions, eliminate industrial frequency traction transformer and step-down transformer.The single phase ac-straight
Current converter includes rectification circuit 3, bidirectional DC-DC converter circuit 4.The utility model is applied to electric power supply system for subway number of modules
Few, at low cost, simple in structure, controllability is strong, and operation and maintenance is convenient.When subway regenerative braking, the double of energy can be realized
To transmission, power grid electric energy up to standard is fed back to, the cascade rectifier of input can realize two-way four-quadrant unity power factor fortune
Row, there is no need to harmonic waves and reactive power compensator.
Claims (4)
1. a kind of electric power electric transformer, middle pressure alternating current A phase, B phase, C phase is respectively hung oneself reactor LA, reactor LB, reactor
LC cascades n AC-DC converter A1, converter B1, converter C1 and picks out again, wherein n>1, form three-phase input port I；Each phase
Converter DC port it is in parallel, form a dc bus；Dc bus is DC power supply, is converted equipped with n DC-DC thereafter
Device or inverter, the transformer are integrated with n output port U1~Un, wherein n>1；It is characterized in that：
(1) first converter A1 of A phases branch1The positive port A1 of grid side1P is connected through reactor LA with three phase network A, A phase branch
First, road converter A11Grid side negative terminal mouth A11N and second converter A12The positive port A1 of grid side2P phases
Even ..., (n-1)th converter A1n-1Grid side negative terminal mouth A1n-1N and n-th of converter A1nThe positive port A1 of grid sidenP
It is connected, the connection of B phase branch converter B1, C phase branch converters C1 is identical with A phases；N-th of converter of A phase, B phase, C phase
Grid side negative terminal mouth A1nN, negative terminal mouth B1nN, negative terminal mouth C1nN is commonly connected to N points；
(2) each phasing commutator DC port is in parallel, common DC bus, including two kinds of connections：
First connection one, A phases branch converter A11The positive port a of DC side1First converter B1 of P and B phases branch1It is straight
Flow the positive port b in side1First converter C1 of P and C phases branch1The positive port c of DC side1P is connected, and connects the positive port of dc bus,
First converter A1 of A phases branch1, first converter B1 of B phases branch1, first converter C1 of C phases branch1DC side bear
Port a1N, negative terminal mouth b1N and negative terminal mouth c1N is connected, and connects dc bus negative terminal mouth；Second converter A12, second converter
B12, second converter C12... n-th of converter A1n, n-th of converter B1n, n-th of converter C1nDC side connection side
First converter A1 of formula and A phases branch1, first converter B1 of B phases branch1, first converter C1 of C phases branch1Connection side
Formula is identical, and the output of A, B, C three-phase inverter DC side forms a dc bus port；
First connection two, A phases branch converter A11The positive port a of DC side1Second converter A1 of P and A phases branch2It is straight
Flow the positive port a in side2N-th of converter A1 of P ... and A phases branchnThe positive port a of DC sidenP is connected, and connects the anode of dc bus
Mouthful, first converter A1 of A phases branch1Positive DC side end mouth a1Second converter A1 of N and A phases branch2Positive DC side end
Mouth a2N-th of converter A1 of N ... and A phases branchnPositive DC side end mouth anN is connected, and connects the negative terminal mouth of dc bus, B phase transformations
The connection mode of parallel operation B1, C phasing commutator C1 is identical with converter A1, and the output of A phase, B phase, C phase converter DC side forms one
A dc bus port.
2. a kind of electric power electric transformer according to claim 1, it is characterised in that：The dc bus is directly as leading
Draw net nominal DC voltage 1500V or 750V, form output port U1, supply the direct-current traction power supply network of subway.
3. a kind of electric power electric transformer according to claim 1, it is characterised in that：The dc bus is as three lists
The direct-flow input end mouth of phase inverter, inverter output plus terminal mouth ap, positive port bp, positive port cp are handed over respectively as low voltage three-phase
The positive port of flow port exports negative terminal mouth an, and negative terminal mouth bn, negative terminal mouth cn are commonly connected to o points, one three-phase and four-line of composition
The three-phase alternating current output port U of 220/380V2, supply subway power and lighting load electricity consumption.
4. a kind of electric power electric transformer according to claim 1, it is characterised in that：The dc bus is as two-way
The input port of DC-DC converter, output port UnEnergy-storage travelling wave tube accumulator (2) or super capacitor (1) are connect, it can be achieved that energy
Transmitted in both directions, the auxiliary power supply as subway.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721469115.0U CN207398830U (en) | 2017-11-07 | 2017-11-07 | A kind of electric power electric transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721469115.0U CN207398830U (en) | 2017-11-07 | 2017-11-07 | A kind of electric power electric transformer |
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| Publication Number | Publication Date |
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| CN207398830U true CN207398830U (en) | 2018-05-22 |
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| CN201721469115.0U Expired - Fee Related CN207398830U (en) | 2017-11-07 | 2017-11-07 | A kind of electric power electric transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732895A (en) * | 2017-11-07 | 2018-02-23 | 西南交通大学 | A kind of electric power electric transformer |
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2017
- 2017-11-07 CN CN201721469115.0U patent/CN207398830U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732895A (en) * | 2017-11-07 | 2018-02-23 | 西南交通大学 | A kind of electric power electric transformer |
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Granted publication date: 20180522 |