CN205395811U - Module is cascaded formula and can be presented type and draw power supply unit - Google Patents
Module is cascaded formula and can be presented type and draw power supply unit Download PDFInfo
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- CN205395811U CN205395811U CN201620134704.2U CN201620134704U CN205395811U CN 205395811 U CN205395811 U CN 205395811U CN 201620134704 U CN201620134704 U CN 201620134704U CN 205395811 U CN205395811 U CN 205395811U
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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
Abstract
The utility model discloses a module is cascaded formula and can be presented type and draw power supply unit, including the three single -phase two -way flow converter that cascades, every single -phase two way convertor that cascades includes a n cascaded unsteady flow module, the unsteady flow module contains three H bridge converter H1, H2, H3 and a single -phase high -frequency transformer. The utility model discloses a module is cascaded formula city rail and can be presented the type and draw power supply unit and adopt the power electronic high frequency isolation transformer that has energy two -way flow ability and cascade H bridge power electronic and realized electric isolation, high -pressure direct screening and be incorporated into the power networks, draw rectification, contravariant repayment and reactive compensation control, volume and cost reduce, harmonic current is little, stronger overload capacity has.
Description
Technical field
This utility model relates to a kind of urban track traffic traction power set, particularly relate to a kind of employing great power bidirectional current transformer, can meet the traction power supply of train, regenerating braking energy absorbs simultaneously, and has the traction power set of exchange medium voltage network no-power compensation function.
Background technology
Urban track traffic can alleviate the present situation that urban transportation is blocked up day by day, reduces the consumption of Fossil fuel, reduces the vehicle exhaust pollution to air, it is achieved energy-saving and emission-reduction, promotes the sustainable development of the city.Track traffic traction power supply in current city still adopts therefrom pressure 10kV or 35kV electrical network power taking, provides the traction power supply mode of 1500V or 750V after rectifier transformer blood pressure lowering for DC Traction Network again through diode rectifier bridge.Be characterized in simple in construction, less costly, but DC voltage is uncontrollable, fluctuation range is big, is unfavorable for the performance of train performance；Meanwhile, energy can only one-way transmission, the excess energy of train regenerative braking can not feedback AC network, need to consume by braking resistor, cause wasting of energy.Raise additionally, braking resistor heating also results in tunnel temperature, increase the burden of environmental control system, cause consuming again of the energy.Additionally, subway power supply distance, midium voltage cable can produce substantial amounts of reactive current, causes that during underloading at night, the power factor (PF) of main website is low, therefore there is also the demand of reactive-load compensation in electric power supply system for subway.
Utilizing high-power electric and electronic power conversion technology, developing a kind of traction power set with Way of Regenerating Energy Feedback function and no-power compensation function is urban track traffic traction power supply future developing trend.Key technical problems therein is in that: 1, the electric pressure height of electric supply installation is generally 10kV or 35kV；2, installed capacity is big it is generally required at more than MW；3, a set of electric supply installation to meet the technology requirement under different operating condition；4, device needs very strong overload capacity, to meet 400% 1 minute, the overload capacity of 200% 1 hour when doing traction power supply, and device to meet when doing inversion feedback 300% 1 minute, the overload capacity of 150%2 hours.
The one of patent of invention 201110118007.X can be presented in type traction power set and control method thereof, have the electric supply installation technology of reactive-load compensation, traction and regenerating braking energy absorption function have the employing two of middle proposition to overlap current transformer is real meets this requirement, namely a set of diode rectifier meets device requirement under traction rectifier operational mode, and the current transformer of another set of employing all-controlling power electronics device meets device requirement under inversion feedback operational mode and reactive-load compensation operational mode.This two sets current transformer is required for independent Industrial Frequency Transformer, direct-current switch cabinet and high-tension switch cabinet and realizes the connection with DC Traction Network and AC network, and therefore, the cost of device is high and floor space is big.
What patent of invention 201010601917.9 1 kinds had a no-power compensation function can present formula traction power set and control method, and utility model patent 201020676378.0 1 kinds there is no-power compensation function can present formula traction power set, adopt the full-control type power electronic current transformer of a set of two level with energy in bidirectional flow ability to realize different functions, but this scheme current transformer output voltage only has about 1kV, this can cause that device design exists great limitation: 1, Industrial Frequency Transformer is needed to realize the grid-connected of 10kV or 35kV, considerably increase cost and the floor space of device；2, when device to meet overlond running, owing to output voltage is low, the output electric current of device is very big, and the current margin of main circuit device is proposed very high requirement by this, this makes to leave during device parts selection very big design redundancy, causes that equipment cost is high, utilization rate is low.
Summary of the invention
The technical problems to be solved in the utility model is in prior art, and electricity feedback and traction rectifier are controlled by the system that two sets are independent respectively, and cost is big, floor space is big, and design redundancy is many, and utilization rate is low, poor universality.
For solving above-mentioned technical problem, the technical solution adopted in the utility model is: a kind of module-cascade formula can present type traction power set, including three single-phase cascade two-way flow current transformers；Each single-phase cascade two way convertor includes the unsteady flow module of n cascade；Described unsteady flow module comprises three H bridge current transformer H1, H2, H3 and a single-phase high frequency transformator；The external electric terminal of described H bridge current transformer includes two DC terminals and two ac terminals；The DC terminal of H1 connects dc bus, and ac terminal connects the former limit of single-phase high frequency transformator, and the secondary of single-phase high frequency transformator connects the ac terminal of H2, the double; two active bridge DAB current transformer of composition isolated form；The DC terminal of H3 connects the DC terminal of H2, and ac terminal is connected with the ac terminal of the H3 of adjacent sets；Forming the positive and negative dc bus end of the single-phase cascade two way convertor of correspondence after the DC terminal parallel connection of n H1, positive and negative dc bus end is connected to traction contact net and rail respectively through direct-current switch cabinet and negative pole cabinet；The positive and negative ac bus end of the single-phase cascade two way convertor of correspondence is formed after the ac terminal series connection of n H3, positive ac bus end is linked into electrical network by grid-connected reactor and high-tension switch cabinet, and the negative terminal short circuit of negative ac bus end and other biphase cascade two way convertor forms neutral point.
Three H bridge current transformer two kinds of modules of composition of this utility model, the module of parallel module and series connection, parallel module is used for doing the isolation of DC side and AC, and do DC side access here, being used for the energy exchange realizing between DC Traction Network and device internal direct current bus direct current, DC side electric current can share blocks current greatly in parallel；Serial module structure is used in mesohigh grid side and realizes grid-connected, and by exporting the Control of Voltage grid-connected current wanted, it is achieved the energy exchange between device internal direct current bus and AC network, AC voltage is high, can share voltage by the module connected.So the benefit of design have following some: 1. by the reasonable value adjustment of n, it is possible to disperse the voltage x current stress of each module, fully meet the needs of traction and rectification.2. save cost, reduce volume, it is not necessary to design too many redundancy.In prior art; need transformator as isolation during conversion between direct current and exchange; thus playing protection and boost function; and the mode that this utility model is by connecting; make the voltage born on each little module not high; but total output still can reach the even above high pressure of 10KV, 35KV, so just saving traditional costly boosting Industrial Frequency Transformer.Therefore, this utility model set of system can realize rectification \ inverse electricity feedback \ reactive-load compensation three zones simultaneously.
Further, described single-phase high frequency transformator includes two-winding transformer, the magnetic core of described two-winding transformer adopts frequency applications magnetic core, owing to the double; two active bridge DAB current transformer of described isolated form is operated in the high switching frequency of more than kHz, it is all little that described two-winding transformer compares Industrial Frequency Transformer volume, weight, cost.
Concrete, described H bridge current transformer includes four electronic power switch devices and DC capacitor, after each two electronic power switch devices in series in parallel with DC capacitor, drawing two ac terminals of H bridge current transformer between the electronic power switch device of series connection, two DC terminals of H bridge current transformer are drawn at the two ends of DC capacitor.
The utility model has the advantages that: adopt module-cascade formula urban rail can present type traction power set adopt there is the power electronics high-frequency isolation transformer of energy in bidirectional flow ability and cascaded H-bridges power electronics achieves that electrical isolation, high pressure direct screening be grid-connected, traction rectifier, inversion feedback and the control of reactive power compensating；Simultaneously compared with the traction feedback electric supply installation of existing employing Industrial Frequency Transformer, the Industrial Frequency Transformer that this utility model electric supply installation has the advantage that 1, this utility model need not be traditional, the volume of equipment and cost reduce；2, this utility model is output as many level staircase waveform, and the less pollution to electrical network of harmonic current injecting electrical network is less；3, this utility model adopts module-cascade topology, and the current stress of each module device of main circuit is little, and device selects allowance big, and device has higher overload capacity.
Accompanying drawing explanation
Fig. 1 is the circuit diagram that a kind of module-cascade formula of this utility model can present type traction power set.
Fig. 2 is the circuit diagram of this utility model H bridge current transformer.
Fig. 3 is the circuit diagram of the double; two active bridge DAB current transformer of this utility model isolated form.
Fig. 4 is the control block diagram of three-phase cascade two way convertor under traction rectifier/feedback inversion transformation mode of operation.
Fig. 5 is the control block diagram of the double; two active bridge DAB current transformer of isolated form under traction rectifier/feedback inversion transformation mode of operation.
Fig. 6 is the control block diagram of three-phase cascade two way convertor under reactive-load compensation mode of operation.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model is described further.
As Figure 1-3, this utility model one module-cascade formula can present type traction power set, can present type traction power set current transformer and is made up of three single-phase cascade two-way flow current transformers, and each single-phase cascade two way convertor is made up of n unsteady flow module cascade.
Each single-phase cascade two way convertor has positive and negative dc bus end (DC+ and DC-) and positive and negative ac bus end (AC+ and AC-), wherein positive and negative dc bus end is connected to traction contact net and rail respectively through direct-current switch cabinet and negative pole cabinet, its ac bus anode is linked into electrical network by grid-connected reactor and high-tension switch cabinet, and the negative terminal short circuit of its ac bus negative terminal and other biphase cascade two way convertor forms neutral point.
Each unsteady flow module comprises three H bridge current transformers (being numbered Hxy1, Hxy2, Hxy3, wherein x is designated as A, B, C three-phase, and which unsteady flow module y is designated as) and a single-phase high frequency transformator (being numbered Txy).Be H1, Hxy2 be H2, Hxy3 hereinafter referred to as Hxy1 it is H3.
Each H bridge current transformer is made up of four electronic power switch devices and DC capacitor, and external electric terminal has two direct-flow input ends (DC1 and DC2) and two ac output ends (AC1 and AC2).
Single-phase high frequency transformator is two-winding transformer, and its magnetic core adopts high frequency magnetic core material, and design of transformer has certain leakage inductance.
The ac output end of H1 and the H2 of each unsteady flow module connects the primary and secondary side of high frequency transformer respectively, forms the double; two active bridge DAB current transformer of an isolated form.The two H bridge adopts the high-frequency impulse of bipolarity PWM output Symmetrical, certain phase contrast is had between the pulse of two H bridges, by controlling the positive and negative and size of phase contrast, change the voltage in high frequency transformer leakage inductance thus affecting transformer current, control direction and the size of energy Flow, make energy can carry out two-way flow between two H bridges.When the output voltage phase place of H1 is ahead of the output voltage phase place of H2, energy flows to H2 from H1, otherwise then energy flows to H1 from H2.
The direct-flow input end of H1 is linked into positive and negative dc bus end (DC+ and DC-), the direct-flow input end of the direct-flow input end of H2 current transformer and the 3rd H bridge connects, the ac output end of the 3rd H bridge joins end to end with the AC port of adjacent unsteady flow module (AC1 of this module is connected with the AC2 of a upper module, and the AC2 of this module is connected with the AC1 of next module) as the AC port of module.3rd H bridge level cascade of n unsteady flow module of every phase forms H bridge cascade connection multi-level current transformer, it adopts phase-shifting carrier wave many level PWMs modulator approach, output voltage is the high pressure staircase waveform of superposition, by grid-connected reactor and high-tension switch cabinet realize with 10kV or 35kV high-voltage fence grid-connected.Control three-phase the output amplitude of high pressure staircase waveform, phase place and just can realize the exchange of active power and reactive power between H bridge cascade connection multi-level current transformer and electrical network.
As shown in Figure 4, adopt the double-closed-loop control method of outer voltage and current inner loop for three-phase H bridge cascade converter, outer voltage controls DC bus-bar voltage, and its output is as the instruction of current inner loop, controlling 3 phase H bridge cascade converters is a current source, the instruction of output current tracking current inner loop.
Control principle:
When presenting type traction power set and be operated in traction rectifier/feedback inversion transformation mode of operation, device detects Traction networks DC bus-bar voltage in real time, controls closed loop by Traction networks DC bus-bar voltage and controls the energy exchange of H bridge cascade converter and AC network in real time.When vehicle traction starts, Traction networks DC bus-bar voltage is pulled low, H bridge cascade converter obtains energy from AC network and causes the rising of device internal direct current busbar voltage, simultaneously the double; two active bridge DAB current transformer of isolated form is by device internal direct current bus energy injection DC traction electrical network, thus keeping stablizing of Traction networks DC bus-bar voltage and device internal direct current busbar voltage in installed capacity；When car braking regenerative braking, regenerated energy makes Traction networks DC bus-bar voltage raise, H bridge cascade converter injects active power to electrical network and causes the decline of device internal direct current busbar voltage, simultaneously the double; two active bridge current transformer of isolated form obtains energy injection device internal direct current bus from DC traction electrical network, thus maintaining stablizing of Traction networks DC bus-bar voltage and device internal direct current busbar voltage.
Concrete steps:
1) the reference voltage Vdcref that outer shroud controls is set at control end；
2) Traction networks DC bus-bar voltage Vdc in monitoring outer shroud control in real time, it can be used as feedback voltage level and outer shroud reference voltage level Vdcref to compare, draws both differences；As Vdcref-Vdc > 0, export feedback inversion transformation command signal；As Vdcref-Vdc < 0, export traction rectifier command signal；
3) using step 2) the control instruction input pi regulator that controls as interior circular current of output, obtain internal ring and control the meritorious reference current Idref of d axle, the size of reactive-load compensation as required obtains the idle reference current Iqref of q axle simultaneously.
4) the electric current I of three-phase alternating current side output is monitored in real time, and convert it under dq coordinate, form watt current Id and reactive current Iq；
5) using Id as value of feedback, Idref as reference value, pi regulator is inputted；When needing reactive-load compensation, using Iq as value of feedback, Iqref as reference value, input pi regulator；In conjunction with the output of active reactive, under dq coordinate, adjusted value；
6) regulated value under dq coordinate is transformed into the regulated value drawing a, b, c three-phase under abc coordinate respectively, carries out pwm modulation, obtain H bridge cascade converter pulse distribution signal.
As it is shown in figure 5, be the control of the double; two active bridge DAB current transformer of isolated form under traction rectifier/feedback inversion transformation mode of operation.Wherein in H bridge cascade converter, the DC voltage of each H bridge is controlled by the double; two active bridge DAB current transformer of the isolated form of this H bridge place unsteady flow module.
Concrete steps:
1) heart arranges reference voltage Vdc2ref in the controlling, monitors the device internal direct current bus voltage value Vdc2 of H2 in real time as the fed back values of closed loop control, compares with Vdc2ref；
2) fiducial value that step 1) draws inputs pi regulator as control instruction, obtains the phase difference θ n of H2 and H1, this angle value is carried out PWM, obtains DAB converter pulse distribution signal.
As shown in Figure 6, when presenting type traction power set and do reactive-load compensation operation, its control method and the outer shroud being distinctive in that three-phase H bridge cascade converter when being operated in traction rectifier/feedback inversion transformation mode of operation are not Voltage loop but reactive power ring.
Specifically comprise the following steps that
1) the reactive power reference qref Qref that outer shroud controls is set at control end；
2) the reactive power actual value Qout of Traction networks dc bus in monitoring outer shroud control in real time, it can be used as the reactive power reference qref Qref that feedback voltage level and outer shroud control to compare, draws both differences；As Qref-Qout > 0, it is not necessary to reactive-load compensation；As Qref-Qout < 0, output the control of reactive power compensating instruction controls to interior circular current；
3) using step 2) the control instruction input pi regulator that controls as interior circular current of output, obtain internal ring and control the meritorious reference current Idref of d axle, the size of reactive-load compensation as required obtains the idle reference current Iqref of q axle simultaneously；
4) the electric current I of three-phase alternating current side output is monitored in real time, and convert it under dq coordinate, form watt current Id and reactive current Iq；
5) using Id as value of feedback, Idref as reference value, pi regulator is inputted；When needing reactive-load compensation, using Iq as value of feedback, Iqref as reference value, input pi regulator；In conjunction with the output of active reactive, under dq coordinate, adjusted value；
6) regulated value under dq coordinate is transformed into the regulated value drawing a, b, c three-phase under abc coordinate respectively, carries out pwm modulation, obtain H bridge cascade converter pulse distribution signal.
Claims (3)
1. module-cascade formula can present a type traction power set, it is characterized in that: includes three single-phase cascade two-way flow current transformers；Each single-phase cascade two way convertor includes the unsteady flow module of n cascade；
Described unsteady flow module comprises three H bridge current transformer H1, H2, H3 and a single-phase high frequency transformator；The external electric terminal of described H bridge current transformer includes two DC terminals and two ac terminals；The DC terminal of H1 connects dc bus, and ac terminal connects the former limit of single-phase high frequency transformator, and the secondary of single-phase high frequency transformator connects the ac terminal of H2, the double; two active bridge DAB current transformer of composition isolated form；The DC terminal of H3 connects the DC terminal of H2, and ac terminal is connected with the ac terminal of the H3 of adjacent sets；
Forming the positive and negative dc bus end of the single-phase cascade two way convertor of correspondence after the DC terminal parallel connection of n H1, positive and negative dc bus end is connected to DC traction contact net and rail respectively through direct-current switch cabinet and negative pole cabinet；The positive and negative ac bus end of the single-phase cascade two way convertor of correspondence is formed after the ac terminal series connection of n H3, positive ac bus end is linked into electrical network by grid-connected reactor and high-tension switch cabinet, and the negative terminal short circuit of negative ac bus end and other biphase cascade two way convertor forms neutral point.
2. a kind of module-cascade formula according to claim 1 can present type traction power set, it is characterized in that: described single-phase high frequency transformator includes two-winding transformer, and the magnetic core of described winding transformer adopts high frequency magnetic core.
3. a kind of module-cascade formula according to claim 1 and 2 can present type traction power set, it is characterized in that: described H bridge current transformer includes four electronic power switch devices and DC capacitor, after each two electronic power switch devices in series in parallel with DC capacitor, drawing two ac terminals of H bridge current transformer between the electronic power switch device of series connection, two DC terminals of H bridge current transformer are drawn at the two ends of DC capacitor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620134704.2U CN205395811U (en) | 2016-02-23 | 2016-02-23 | Module is cascaded formula and can be presented type and draw power supply unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620134704.2U CN205395811U (en) | 2016-02-23 | 2016-02-23 | Module is cascaded formula and can be presented type and draw power supply unit |
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| CN205395811U true CN205395811U (en) | 2016-07-27 |
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| CN201620134704.2U Withdrawn - After Issue CN205395811U (en) | 2016-02-23 | 2016-02-23 | Module is cascaded formula and can be presented type and draw power supply unit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105584386A (en) * | 2016-02-23 | 2016-05-18 | 南京亚派科技股份有限公司 | Module cascade energy feedback type traction power supply device and control method thereof |
| CN106218447A (en) * | 2016-08-16 | 2016-12-14 | 深圳市禾望电气股份有限公司 | A kind of control method that can present type traction power set and system |
| CN107590343A (en) * | 2017-09-19 | 2018-01-16 | 南京南瑞继保电气有限公司 | A kind of track traffic full line analogue system and emulation mode |
| CN110190628A (en) * | 2019-06-12 | 2019-08-30 | 西南交通大学 | A kind of full Parallel AT tractive power supply system of multiple line based on comprehensive energy and method |
| CN113037107A (en) * | 2021-03-04 | 2021-06-25 | 广东电网有限责任公司 | Topological structure of power electronic transformer |
| CN114123838A (en) * | 2021-12-02 | 2022-03-01 | 新风光电子科技股份有限公司 | Bidirectional converter device applied to subway high-altitude environment and control method |
-
2016
- 2016-02-23 CN CN201620134704.2U patent/CN205395811U/en not_active Withdrawn - After Issue
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105584386A (en) * | 2016-02-23 | 2016-05-18 | 南京亚派科技股份有限公司 | Module cascade energy feedback type traction power supply device and control method thereof |
| CN106218447A (en) * | 2016-08-16 | 2016-12-14 | 深圳市禾望电气股份有限公司 | A kind of control method that can present type traction power set and system |
| CN107590343A (en) * | 2017-09-19 | 2018-01-16 | 南京南瑞继保电气有限公司 | A kind of track traffic full line analogue system and emulation mode |
| CN107590343B (en) * | 2017-09-19 | 2020-12-18 | 南京南瑞继保电气有限公司 | Rail transit full-line simulation system and method |
| CN110190628A (en) * | 2019-06-12 | 2019-08-30 | 西南交通大学 | A kind of full Parallel AT tractive power supply system of multiple line based on comprehensive energy and method |
| CN110190628B (en) * | 2019-06-12 | 2022-04-15 | 西南交通大学 | Complex line full-parallel AT traction power supply system and method based on comprehensive energy |
| CN113037107A (en) * | 2021-03-04 | 2021-06-25 | 广东电网有限责任公司 | Topological structure of power electronic transformer |
| CN114123838A (en) * | 2021-12-02 | 2022-03-01 | 新风光电子科技股份有限公司 | Bidirectional converter device applied to subway high-altitude environment and control method |
| CN114123838B (en) * | 2021-12-02 | 2024-01-05 | 新风光电子科技股份有限公司 | Bidirectional converter device applied to subway high-altitude environment and control method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160727 Effective date of abandoning: 20171020 |