CN104527462A - Existing traction power supply system based improved parallel through type traction power supply system - Google Patents
Existing traction power supply system based improved parallel through type traction power supply system Download PDFInfo
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- CN104527462A CN104527462A CN201410680837.5A CN201410680837A CN104527462A CN 104527462 A CN104527462 A CN 104527462A CN 201410680837 A CN201410680837 A CN 201410680837A CN 104527462 A CN104527462 A CN 104527462A
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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
- Y02E40/20—Active power filtering [APF]
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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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- 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
- Y02E40/40—Arrangements for reducing harmonics
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses an existing traction power supply system based improved parallel through type traction power supply system. A power electronic transform device which is used for replacing the electric split-phase is arranged between every three-phase power grid and a corresponding traction network; an output alpha base and an output beta base of a traction transformer Q of every three-phase power grid are accessed into every traction power substation, wherein the output alpha base and the output beta base are connected with the corresponding traction network through the corresponding power electronic transform device D and a boosting transformer S respectively and the boosting transformer S is connected with the power electronic transform device D; every power electronic transform device D is formed by more than one parallel single-phase to single-phase converter which is used for generating the alternating-current to direct-current to alternating-current transformation. According to the existing traction power supply system based improved parallel through type traction power supply system, the power grid three-phase electricity is changed into the two-base single-phase electricity through the existing three-phase two-phase traction transformer in every traction power substation, the amplitude, the phase and the frequency controllable single-phase electricity of each-base single-phase electricity is obtained through a single-phase step-down and boosting transformer and a single-phase to single-phase PWM (Pulse Width Modulation) converter to implement the through type traction power supply, and accordingly the reactive power and the harmonic wave can be effectively compensated, the load balance can be implemented, and the power quality can be greatly improved and the capacity of every traction power substation can be improved through the parallel connection of the plurality of convertors, the modularization is easy, and the redundant backup of the system is convenient.
Description
Technical field
The present invention relates to electric railway traction power supply system, particularly without electric phase-splitting Traction networks equipment technical field.
Background technology
There is the quality of power supply and cross phase-splitting problem in the existing electrified railway power supply system of China and technology thereof.Current electric railway traction power supply system operation scheme mainly three-phase-two-phase (out-phase) is powered as Fig. 1, relative three-phase electrical power system, at a high speed, the increase of heavy haul train tractive output makes negative phase-sequence problem more outstanding, and the problems such as the idle and harmonic wave in the quality of power supply are also comparatively serious.In addition, the train speed that electric phase-splitting causes and loss of traction problem, have a strong impact on tractive power supply system overall performance.
By the technology of cophase supply shown in Fig. 2 based on the cophase supply technology of active compensation and more perfect based on Passively compensated cophase supply technical know-how system, the feasibility of cophase supply system is realized under demonstrating various frame mode, to promoting that the progress of traction power supply technology is significant from theoretical analysis, simulating, verifying.But still fail thoroughly to solve electric phase-splitting problem; And it is perfect not in system architecture based on the cophase supply technology of active compensation; Based on Passively compensated cophase supply technology underaction in control, the tracted load that reply has impact feature faces larger difficulty etc.
For effectively solving the problem, by modern power electronics technology and control theory, realize electrified railway in-phase power supply and the interconnected through of Traction networks is a kind of desirable solution.Fig. 3 is the traction substation structure built by changer of the through homo-phase traction power supply system for idealized model, 3 traction substation output voltage amplitudes, frequency are consistent with phase place, meet the interconnection condition of through power supply, therefore the output of each traction substation can be interconnected, and forms through tractive power supply system.Each section Traction networks no longer needs to arrange electric phase-splitting, therefore, avoids the input of the electric neutral section of One's name is legion, avoids the loss of the tractive force of train that phase-splitting causes simultaneously.But this system does not consider power system capacity and economy problems, it is a kind of idealized model of tractive power supply system development.
Summary of the invention
In view of the deficiencies in the prior art, the object of the invention is to propose a kind of through tractive power supply system of parallel connection type improved based on existing tractive power supply system, electric energy can be made to gain merit and reactive volt-amperes for tractive power supply system provides after system from traction transformer side, realize the through power supply of electrified railway.
The object of the invention is to be realized by following means.
Based on the through tractive power supply system of parallel connection type that existing tractive power supply system improves, the Technics of Power Electronic Conversion device being used for substituting electric phase-splitting is set between three phase network and Traction networks.In a traction substation, output α seat and the β of the traction transformer Q of access three phase network are connected with Traction networks respectively by Technics of Power Electronic Conversion device D and the step-up transformer S that is attached thereto; Described Technics of Power Electronic Conversion device D by more than of parallel connection produce ac-dc-ac transform single-phase-single-phase invertor; Described single-phase-single-phase invertor forms primarily of single-phase diode-clamped multi-level rectifying circuit, single-phase diode-clamped multi-level inverter circuit and input and output linked reactor.
Inner at traction substation, use multiple PWM rectifier and inverter to form single-phase-single-phase invertor and use instantaneous current to divide equally control policy is in parallel makes traction substation output voltage controlled and suppress circulation, for through tractive power supply system provides the basis of realization, in load position by reaching automatic shunt, simultaneously, avoid circulation between traction substation excessive by wireless sharing control, guarantee system is normally run.
Electrical network three-phase electricity is become two single-phase electricity by the three-phase two-phase traction transformer in existing traction substation by the present invention, every single-phase electricity utilizes phase buck/step-up transformer and single-phase-single-phase PWM changer to obtain the controlled single-phase electricity of amplitude, phase place and frequency, the lifting of traction substation capacity and through traction power supply is realized by inverter parallel technology, balanced three-phase load electric current, solves tractive power supply system negative phase-sequence problem.Therefore can utilize existing traction substation equipment, realize through traction power supply, expand traction substation capacity, increase system redundancy reliability.
Compared with prior art, beneficial effect of the present invention is:
1, because rectifier and inverter all adopt controllable devices, therefore each module can four-quadrant work pattern, namely the through tractive power supply system structure that the present invention proposes both can absorb from three phase network and provide active volt-amperes to Traction networks, also can from Traction networks absorption and to three phase network feedback active volt-amperes.In addition, many level single-phase inverter also can be Traction networks and provides idle and harmonic wave compensate function.
2, the many level of parallel connection that use of the present invention single-phase-single-phase invertor structure can utilize existing traction substation system equipment, the basis that existing three-phase-two-phase is powered realizes through power supply, existing installation can be utilized greatly than desirable through homo-phase traction power supply system, reduce disposable input cost.
3, because many level diode clamp inverter output voltage phase place, frequency and amplitude are completely controlled, voltage-phase, frequency and the amplitude that therefore can export according to the information of voltage adjustment inverter of feeding section, multi-inverter parallel can be realized in substation to expand traction substation capacity, meeting existing substation capacity demand, providing possibility for realizing through power supply between traction substation.
4, single-phase-single-phase invertor parallel system can realize electrical network and export three-phase balance and system redundancy, single single-phase-single-phase invertor fault time system still can reliability service.
Accompanying drawing explanation
Fig. 1 is existing three-phase-two-phase (out-phase) tractive power supply system schematic diagram;
Fig. 2 is cophase supply system schematic;
Fig. 3 is the through cophase supply system schematic of idealized model;
Fig. 4 is a kind of through tractive power supply system of parallel connection type improved based on existing tractive power supply system of the present invention;
Fig. 5 be two level single-phase-single-phase PWM transformer configuration sketch;
Fig. 6 be five level diode clamps single-phase-single-phase invertor power circuit;
Single seat parallel single-phase in Tu7Shi substation of the present invention-single-phase PWM transformer configuration schematic diagram;
Fig. 8 is the single traction substation structural representation of the present invention.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 4 is a kind of through homo-phase traction power supply system structure diagram of parallel connection type improved based on existing tractive power supply system of the present invention, this system be two output single-phase voltages in existing substation basis on increase the formations such as Dan Xiang – single-phase PWM changer and lifting/voltage reducing voltage transformer.Changer receives active current after being transformed to direct current from the single phase A.C. side draught after step-down, then by single-phase inverter output single-phase alternating current, then through step-up transformer for tractive load provides idle and active current.Because single phase rectifier and single-phase inverter can operate in four-quadrant, and parallel operation convertor controls has current-sharing effect, therefore single-phase-single-phase PWM changer can the active current of simultaneously equilibrium assignmen three-phase side system, and control outgoing side electric voltage frequency, phase place and amplitude, thoroughly solve the electric phase-splitting problem of tractive power supply system to the power quality problem of three phase network and Traction networks self.The through tractive power supply system structure of the present invention both can absorb from three phase network and provide active volt-amperes to Traction networks, also can from Traction networks absorption and to three phase network feedback active volt-amperes.For realizing through power supply, output voltage amplitude between each traction substation, phase place, frequency are consistent, due to apart from each other between traction substation, inconvenience realizes communication, so implement droop control by inverter output amplitude, phase angle drooping characteristics can reach automatic shunt between substation.
Fig. 5 be can realize Fig. 4 single-phase-two level ac-dc-ac transform device structures of single-phase invertor unit.This structure mainly comprises single-phase PWM rectifying circuit, DC capacitor and single-phase PWM inverter circuit.Under pwm converter can be operated in rectification, inverter mode under suitable mode, therefore, two pwm converter structures of Fig. 4 both can be tracted load provides energy, also by the energy back telegram in reply net of Traction networks, can realize the two-way flow of energy.To simplify the analysis, follow-up three phase network being discussed provides function this kind of working condition to Traction networks, and three-phase-two-phase traction transformer side converter is called PWM rectifier, and contact system side converter is called PWM inverter.
Adaptor union electricity is by transformer voltage ratio and actual through cophase supply system restriction, and single-phase-single-phase invertor needs to improve level number to solve changer problem of withstand voltage.Fig. 6 implements the many level of diode clamp for five level in present system to hand over orthogonal single-phase phase-single-phase invertor power circuit.This circuit is made up of the part such as five level diode clamp single phase rectifier circuits, five level diode clamp single-phase inversion circuit.Wherein, Single-phase PWM Rectifier is connected by 2n binistor with two brachium pontis of inverter, and top is connected DC side with end, and mid point connects step-down transformer.With mid point, changer is divided into upper and lower two brachium pontis, the switch of upper and lower bridge arm position mends conducting at normal mutual when working.These five pairs of binistors are connected with five DC capacitors of connecting by the mid point of four pairs of diode clamps, and method of attachment as shown in Figure 6.Diode clamp multi-level converter is due to cannot be thoroughly balanced to middle capacitor charge and discharge, there is capacitance voltage unbalanced is topic, by space vector PWM modulation mode, the voltage of switching valve mid point is connected with different DC capacitors from catching diode by the binistor of conducting, therefore selects suitable vector balancing capacitance voltage while exportable six kinds of level.In this circuit, the withstand voltage of each binistor only has 1/5th of vdc, and therefore, catching diode multi-level converter can make vdc significantly improve, and power system capacity is also corresponding to be significantly improved.
Fig. 7 is single seat parallel single-phase-single-phase PWM changer, due to by power electric component Power Limitation, single single-phase-single-phase PWM changer capacity is less, therefore build multiple single-phase-single-phase PWM changer parallel system is with capacity.Because the spacing of changer is shorter, information can be shared, and each changer can pass through to detect respective output voltage, to reach the object of voltage stabilizing; Doing poor comparison by detecting self outgoing current and parallel system outgoing current, adjusting the amplitude of respective output voltage, phase place, to reach the object suppressing circulation.
Fig. 8 is the present invention's single traction substation parallel-connection structure schematic diagram, the parallel single-phase that α seat and β seat are connected respectively-single-phase PWM transducer array is in parallel to realize through power supply in traction substation again, again in parallel by α seat and β seat two single seat parallel single-phase-single-phase PWM changers, the flow equalize technology of parallel system is utilized to control two horsepower output balances, for tractive power supply system equally can by respectively to two parallel single-phase-single-phase PWM transducer array separately output voltage detect and reach the object of voltage stabilizing, by to two base systems, outgoing current and traction substation outgoing current do poor comparison separately, to adjust the amplitude of respective output voltage, phase place, to reach the object suppressing circulation.
Claims (3)
1. the through tractive power supply system of parallel connection type improved based on existing tractive power supply system, the Technics of Power Electronic Conversion device being used for substituting electric phase-splitting is set between three phase network and Traction networks, it is characterized in that, in a traction substation, output α seat and the β of the traction transformer Q of access three phase network are connected with Traction networks respectively by Technics of Power Electronic Conversion device D and the step-up transformer S that is attached thereto; Described Technics of Power Electronic Conversion device D by more than of parallel connection produce ac-dc-ac transform single-phase-single-phase invertor; Described single-phase-single-phase invertor forms primarily of single-phase diode-clamped multi-level rectifying circuit, single-phase diode-clamped multi-level inverter circuit and input and output linked reactor.
2. a kind of through tractive power supply system of parallel connection type improved based on existing tractive power supply system according to claim 1, it is characterized in that, inner at traction substation, use multiple PWM rectifier and inverter to form single-phase-single-phase invertor and use instantaneous current to divide equally control policy is in parallel makes traction substation output voltage controlled and suppress circulation, for through tractive power supply system provides the basis of realization, in load position by reaching automatic shunt, simultaneously, avoid circulation between traction substation excessive by wireless sharing control, guarantee system is normally run.
3. the through tractive power supply system of parallel connection type improved based on existing tractive power supply system according to claim 1, it is characterized in that, described single-phase diode-clamped multi-level rectifying circuit, single-phase diode-clamped multi-level inverter circuit adopt five level diode clamps single-phase-single-phase invertor.
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| CN105790274A (en) * | 2016-03-09 | 2016-07-20 | 西南交通大学 | Power flow control device and control method for run-through power supply system converter type traction substation |
| CN107104443A (en) * | 2017-06-21 | 2017-08-29 | 西南交通大学 | A kind of electric power electric transformer |
| CN107953803A (en) * | 2017-12-25 | 2018-04-24 | 西南交通大学 | Flexible direct current tractive power supply system and its control method are pressed in one kind |
| CN108859790A (en) * | 2017-05-15 | 2018-11-23 | 华东交通大学 | A kind of novel traction transmission system main circuit |
| CN108859872A (en) * | 2017-05-15 | 2018-11-23 | 中车株洲电力机车研究所有限公司 | A kind of virtual perforation alternating current traction power supply system |
| CN109435783A (en) * | 2018-10-25 | 2019-03-08 | 中铁二院工程集团有限责任公司 | Negative sequence management system for electric railway traction power supply system AT power supply mode |
| CN109606204A (en) * | 2018-11-05 | 2019-04-12 | 北京交通大学 | The power supply system and method for the vehicle-mounted energy storage device mobile charging of municipal rail train can be achieved |
| CN110126682A (en) * | 2019-05-20 | 2019-08-16 | 西南交通大学 | A kind of electric railway two-side feeding method |
| CN110165906A (en) * | 2019-06-18 | 2019-08-23 | 西南交通大学 | A kind of electric power electric transformer |
| CN110277788A (en) * | 2019-07-25 | 2019-09-24 | 国网青海省电力公司果洛供电公司 | Power supply combined compensation device sparse over long distances |
| CN110994644A (en) * | 2019-12-04 | 2020-04-10 | 中国电力科学研究院有限公司 | Inverter active current priority distribution method and system under frequency disturbance |
| EP3696009A1 (en) * | 2019-02-12 | 2020-08-19 | Furrer + Frey AG | Method for symmetrising a three phase current |
| CN111585290A (en) * | 2020-06-15 | 2020-08-25 | 西南交通大学 | In-phase power supply structure of traction-compensation transformer and compensation method thereof |
| CN111969860A (en) * | 2020-09-22 | 2020-11-20 | 中铁电气化局集团有限公司 | Traction power supply system and method for converting two-phase symmetrical alternating current into single-phase alternating current |
| CN112124153A (en) * | 2020-09-28 | 2020-12-25 | 成都尚华电气有限公司 | Through type in-phase power supply structure, system and control method |
| CN112421761A (en) * | 2020-11-29 | 2021-02-26 | 西南交通大学 | Relay protection reconstruction self-healing method for hub traction power supply system |
| CN113131484A (en) * | 2021-04-29 | 2021-07-16 | 西安开天铁路电气股份有限公司 | Distributed railway regenerative electric energy cloud control system |
| CN113224762A (en) * | 2021-05-28 | 2021-08-06 | 西南交通大学 | Long-distance through flexible traction power supply system and optimization control method thereof |
| CN113364306A (en) * | 2021-06-18 | 2021-09-07 | 西南交通大学 | Two-phase-single-phase intersection direct-alternating cascade converter system |
| CN114421462A (en) * | 2022-01-21 | 2022-04-29 | 西南交通大学 | Stable operation control method of flexible traction power supply system |
| CN114498671A (en) * | 2021-12-21 | 2022-05-13 | 西南交通大学 | Flexible traction power supply system and energy coordination control method thereof |
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| CN105790274A (en) * | 2016-03-09 | 2016-07-20 | 西南交通大学 | Power flow control device and control method for run-through power supply system converter type traction substation |
| CN105790274B (en) * | 2016-03-09 | 2018-05-22 | 西南交通大学 | A kind of perforation electric power system inverter type traction substation load flow regulation device and its regulation and control method |
| CN108859790A (en) * | 2017-05-15 | 2018-11-23 | 华东交通大学 | A kind of novel traction transmission system main circuit |
| CN108859872A (en) * | 2017-05-15 | 2018-11-23 | 中车株洲电力机车研究所有限公司 | A kind of virtual perforation alternating current traction power supply system |
| CN107104443A (en) * | 2017-06-21 | 2017-08-29 | 西南交通大学 | A kind of electric power electric transformer |
| CN107953803A (en) * | 2017-12-25 | 2018-04-24 | 西南交通大学 | Flexible direct current tractive power supply system and its control method are pressed in one kind |
| CN109435783A (en) * | 2018-10-25 | 2019-03-08 | 中铁二院工程集团有限责任公司 | Negative sequence management system for electric railway traction power supply system AT power supply mode |
| CN109435783B (en) * | 2018-10-25 | 2023-09-22 | 中铁二院工程集团有限责任公司 | Negative sequence management system for AT power supply mode of electrified railway traction power supply system |
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| WO2020165745A1 (en) * | 2019-02-12 | 2020-08-20 | Furrer + Frey Ag | Method for symmetrising a three phase current |
| CN113453947A (en) * | 2019-02-12 | 2021-09-28 | 富雷尔＋弗赖股份公司 | Method for making three-phase current symmetrical |
| CN110126682A (en) * | 2019-05-20 | 2019-08-16 | 西南交通大学 | A kind of electric railway two-side feeding method |
| CN110126682B (en) * | 2019-05-20 | 2021-01-08 | 西南交通大学 | Bilateral power supply method for electrified railway |
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| CN110165906B (en) * | 2019-06-18 | 2024-04-30 | 西南交通大学 | Power electronic transformer |
| CN110277788A (en) * | 2019-07-25 | 2019-09-24 | 国网青海省电力公司果洛供电公司 | Power supply combined compensation device sparse over long distances |
| CN110277788B (en) * | 2019-07-25 | 2023-12-12 | 国网青海省电力公司果洛供电公司 | Composite compensation device for long-distance sparse power supply |
| CN110994644A (en) * | 2019-12-04 | 2020-04-10 | 中国电力科学研究院有限公司 | Inverter active current priority distribution method and system under frequency disturbance |
| CN111585290A (en) * | 2020-06-15 | 2020-08-25 | 西南交通大学 | In-phase power supply structure of traction-compensation transformer and compensation method thereof |
| CN111969860A (en) * | 2020-09-22 | 2020-11-20 | 中铁电气化局集团有限公司 | Traction power supply system and method for converting two-phase symmetrical alternating current into single-phase alternating current |
| CN112124153B (en) * | 2020-09-28 | 2023-11-10 | 成都尚华电气有限公司 | Through type in-phase power supply structure, system and control method |
| CN112124153A (en) * | 2020-09-28 | 2020-12-25 | 成都尚华电气有限公司 | Through type in-phase power supply structure, system and control method |
| CN112421761A (en) * | 2020-11-29 | 2021-02-26 | 西南交通大学 | Relay protection reconstruction self-healing method for hub traction power supply system |
| CN113131484A (en) * | 2021-04-29 | 2021-07-16 | 西安开天铁路电气股份有限公司 | Distributed railway regenerative electric energy cloud control system |
| CN113224762A (en) * | 2021-05-28 | 2021-08-06 | 西南交通大学 | Long-distance through flexible traction power supply system and optimization control method thereof |
| CN113364306A (en) * | 2021-06-18 | 2021-09-07 | 西南交通大学 | Two-phase-single-phase intersection direct-alternating cascade converter system |
| CN114498671A (en) * | 2021-12-21 | 2022-05-13 | 西南交通大学 | Flexible traction power supply system and energy coordination control method thereof |
| CN114498671B (en) * | 2021-12-21 | 2023-03-24 | 西南交通大学 | Flexible traction power supply system and energy coordination control method thereof |
| CN114421462A (en) * | 2022-01-21 | 2022-04-29 | 西南交通大学 | Stable operation control method of flexible traction power supply system |
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Application publication date: 20150422 |