CN103407383A - Bidirectional interactive type DC (direct-current) traction power supply system base on new energy - Google Patents
Bidirectional interactive type DC (direct-current) traction power supply system base on new energy Download PDFInfo
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Abstract
A bidirectional interactive type DC traction power supply system base on new energy is provided with more than two traction substations, wherein more than one transformer connected with an AC (alternating-current) bus is connected onto each traction substation; the other side of the transformer is connected with a bidirectional AC-DC converter; the other side of the bidirectional AC-DC converter is connected to a DC bus located on the traction substation; the DC bus is connected with a contact net and a steel rail; an electric locomotive is connected with the contact net and the steel rail; a section post of the DC bus is connected to the contact net of the traction substation; a DC new energy system comprising an electric automobile charge-discharge system, a distributed type power supply and more than one low-voltage DC micro-grid is arranged on the DC bus between two adjacent traction substations; and a DC circular micro-grid is formed in one power supply section. According to the bidirectional interactive type DC traction power supply system base on the new energy, distributed type new energy is fully used, and braking energy of the electric locomotive is recycled; the power supply reliability of the DC traction power supply system is improved; and bidirectional interaction of electric energy is realized.
Description
Technical field
The present invention relates to a kind of DC traction power-supply system.Particularly relating to a kind of distributed power source, changing electricity is the DC traction power-supply system of the inter-act based on new forms of energy that main electronlmobil charge-discharge system combines with DC traction power-supply system.
Background technology
Along with the fast development of economy and urbanization process, energy shock, environmental pollution and traffic congestion have become the serious problems that the world today faces.Urban electric vehicular traffic (subway, tramway train and trackless trolley car) and electronlmobil can be alleviated the day by day serious traffic congestion in city, reduce the consumption of limited fossil fuel, reduce aerial contamination, realizing the sustainable development in energy-saving and emission-reduction and city, is the main traffic instrument that future city is greatly developed.
The charge system that the development need of electronlmobil is corresponding, charge mode commonly used have three kinds of normal charge, fast charge and power batteries fast replacement systems (abbreviation changes electricity).For the urban public transport elec. vehicle, changing electricity is a kind of good charge mode.Charging system for electric automobile not only needs huge construction cost, and can produce many harmful effects to electric system.Simultaneously, electric automobile power battery is also an energy storage device that capacity is huge.
Traditional DC traction power-supply system adopts the diode rectifier power supply usually, and traction substation has one way feeding and two way feeding to the mode of contact system power supply.The voltage class of the DC supply of China GB regulation has two kinds of 750V and 1500V.The braking energy of electric locomotive consumes on braking resistor usually, and this has not only caused the waste of energy, but also can cause the rising of tunnel temperature, increases the burden of temperature control system, further causes the waste of the energy.The recycling of electric locomotive braking energy is the direction of tractive power supply system future development.
As shown in Figure 1, existing DC traction power-supply system includes: one or more for the traction substation 1 of direct current energy, this traction substation 1 are provided to electric locomotive 2, be to adopt traditional diode rectification DC traction power-supply system.Each traction substation 1 is to consist of voltage transformer 11, rectifier 12, DC bus 13, contact system 14, rail 15 and section post 16.Wherein, voltage transformer 11 can be the three winding transformer of two-winding transformer, three winding transformer or the former limit phase shift adopting extend-triangle and connect ± 7.5 °.Rectifier 12 can be six Pulses Rectifiers, 12 Pulses Rectifiers or 24 Pulses Rectifiers.
Traditional DC traction power-supply system is at electric locomotive operation low ebb with during stopping transport, and the power factor of AC Bulk Supply Substation is very low, need to take Measures of Reactive Compensation.
Economic fast development has promoted the rapid growth of electricity needs, and traditional centralized large electrical network cost is high, the operation difficulty is large, is difficult to meet the requirement of the safety and reliability that the user is more and more higher.Distributed power generation is compared with centralized generating, have pollution less, the advantage such as energy utilization rate is high, place of erection is flexible, power transmission and distribution resource and over-the-road expense have been saved, reduced the line losses of concentrated transmission of electricity, reduce the electrical network total volume, improved electrical network peak valley performance, improved reliability, being that the strong of large electrical network supplements and effectively support, is one of development tendency of electric system.
Distributed power source comprises solar-energy photo-voltaic cell, aerogenerator, miniature gas turbine, fuel cell and biomass power generation etc.
Distributed power source unit cost of access is high, the control difficulty.It is a uncontrollable source with respect to large electrical network, and the mode that therefore large electrical network is often taked to limit, isolate is disposed distributed power source, and to reducing its impact to large electrical network, this has just limited the utilization of distributed power source greatly.
The space that takes full advantage of the urban electric public bus network can development utilization such as solar-energy photo-voltaic cell, miniature gas turbine and fuel cell distributed power supply.
Micro-electrical network is a kind of by the common organic system formed of load, micro-power supply (being the distributed power source in micro-electrical network, as photovoltaic generation, wind-power electricity generation etc.), closed-center system and electric and electronic power converting means; The power supply of micro-electrical network inside mainly is responsible for the conversion of energy by power electronic devices, and essential control is provided; Micro-electrical network can effectively solve the problem of the large electrical network of above-mentioned distributed power source access, coordinates the contradiction between large electrical network and distributed power source.
Micro-electrical network can be divided into the micro-electrical network of interchange, DC micro-electric net, the micro-electrical network of high frequency and alternating current-direct current and mix micro-electrical network.Because the solar-energy photo-voltaic cell in distributed power source and fuel cell this as direct current, although and aerogenerator, miniature gas turbine and biomass power generation etc. are different the exchanging of frequency, can be direct current through a rectifying conversion.The DC micro-electric netting gear has or not surface action, loss is little, efficiency is high, without reactive-load compensation, do not exist the intrinsic stable problem of ac power supply system, fed distance and power not to be subjected to the restriction of electric system synchronized operation stability yet and be easy to the advantages such as control, in electric system, have wide development and application prospect.
Summary of the invention
Technical matters to be solved by this invention is, a kind of DC traction power-supply system of inter-act based on new forms of energy is provided, thereby effective utilization of distributed power source and the recovery of electric locomotive braking energy have been realized, reduce the fluctuation range of existing DC traction power-supply system vdc, improve the power factor of DC traction power-supply system AC Bulk Supply Substation, reduce harmonic wave, improve the reliability of DC traction power-supply system, reduce the construction cost of charging system for electric automobile.
The technical solution adopted in the present invention is: a kind of DC traction power-supply system of inter-act based on new forms of energy, include plural for the traction substation of direct current energy is provided to electric locomotive, each traction substation has the more than one voltage transformer be connected on ac bus, two-way exchange-DC converter of the corresponding connection of the opposite side of each voltage transformer, the opposite side of all two-way exchange-DC converter all is connected on the DC bus of the traction substation be positioned at, the both positive and negative polarity of described DC bus is connected respectively contact system and rail, the both positive and negative polarity of described electric locomotive is connected respectively contact system and rail, on the contact system of each traction substation, be connected to a section post, the two ends of described section post also connect respectively the positive pole of corresponding DC bus, on the DC bus between two adjacent traction substations, be provided with by the electronlmobil charge-discharge system, the direct current new energy resources system that the micro-electrical network of distributed power source and the low-voltage direct more than 1 forms, described direct current new energy resources system is connected with the DC bus of adjacent two traction substations by high voltage dc bus, thereby in a power supply zone, form the micro-electrical network of direct current annular, wherein said electronlmobil charge-discharge system is to consist of the charge-discharge machine of the two-way DC-DC for the connecting electric automobile electrokinetic cell more than 1.
The mouth of the connecting electric automobile electrokinetic cell of described each two-way DC-DC charge-discharge machine is ultracapacitor in parallel also.
Described distributed power source includes more than one miniature gas turbine, more than one aerogenerator, more than one fuel cell and more than one solar-energy photo-voltaic cell, wherein, each miniature gas turbine is connected high voltage dc bus by an one-way communication-DC converter separately with each aerogenerator, and each fuel cell is connected high voltage dc bus by a Unidirectional direct-current-DC converter separately with each solar-energy photo-voltaic cell.
The micro-electrical network of described low-voltage direct includes by a two-way DC-DC converter and is connected to the annular low pressure DC bus on high voltage dc bus, more than one closed-center system, more than one miniature gas turbine, more than one solar-energy photo-voltaic cell, more than one fuel cell, more than one aerogenerator, more than one Unidirectional direct-current-AC converter, more than one two-way DC-DC charge-discharge machine and more than one Unidirectional direct-current-DC converter, wherein, each solar-energy photo-voltaic cell respectively is connected annular low-voltage direct bus by a Unidirectional direct-current-DC converter respectively with each fuel cell, each miniature gas turbine respectively is connected annular low-voltage direct bus by an one-way communication-DC converter respectively with each aerogenerator, each closed-center system respectively connects annular low-voltage direct bus by a two-way DC-DC converter, the output of each Unidirectional direct-current-AC converter connects AC load, the electrokinetic cell of the opposite side connecting electric automobile of each two-way DC-DC charge-discharge machine, the output of each Unidirectional direct-current-DC converter connects DC load.
The micro-electrical network of described low-voltage direct includes by a two-way DC-DC converter and is connected to the radiation low-voltage direct bus on high voltage dc bus, more than one closed-center system, more than one miniature gas turbine, more than one solar-energy photo-voltaic cell, more than one fuel cell, more than one aerogenerator, more than one Unidirectional direct-current-AC converter, more than one two-way DC-DC charge-discharge machine and more than one Unidirectional direct-current-DC converter, wherein, each solar-energy photo-voltaic cell respectively is connected radiation low-voltage direct bus by a Unidirectional direct-current-DC converter respectively with each fuel cell, each miniature gas turbine respectively is connected radiation low-voltage direct bus by an one-way communication-DC converter respectively with each aerogenerator, each closed-center system respectively connects radiation low-voltage direct bus by a two-way DC-DC converter, the output of each Unidirectional direct-current-AC converter connects AC load, the electrokinetic cell of the opposite side connecting electric automobile of each two-way DC-DC charge-discharge machine, the output of each Unidirectional direct-current-DC converter connects DC load.
A kind of DC traction power-supply system of inter-act based on new forms of energy, include one for the traction substation of direct current energy is provided to electric locomotive, traction substation is provided with the more than one voltage transformer be connected on ac bus, two-way exchange-DC converter of the corresponding connection of the opposite side of each voltage transformer, the opposite side of described two-way exchange-DC converter is connected on the DC bus of traction substation, the both positive and negative polarity of described DC bus is connected respectively contact system and rail, the both positive and negative polarity of described electric locomotive is connected respectively contact system and rail, on the DC bus of traction substation, be provided with by the electronlmobil charge-discharge system, the direct current new energy resources system that the micro-electrical network of distributed power source and the low-voltage direct more than 1 forms, described direct current new energy resources system is connected with the DC bus of traction substation by high voltage dc bus, thereby in a power supply zone, form the micro-electrical network of direct current annular, wherein said electronlmobil charge-discharge system is to consist of the charge-discharge machine of the two-way DC-DC for the connecting electric automobile electrokinetic cell more than 1.
The mouth of the connecting electric automobile electrokinetic cell of described each two-way DC-DC charge-discharge machine is ultracapacitor in parallel also.
Described distributed power source includes more than one miniature gas turbine, more than one aerogenerator, more than one fuel cell and more than one solar-energy photo-voltaic cell, wherein, each miniature gas turbine is connected high voltage dc bus by an one-way communication-DC converter separately with each aerogenerator, and each fuel cell is connected high voltage dc bus by a Unidirectional direct-current-DC converter separately with each solar-energy photo-voltaic cell.
The micro-electrical network of described low-voltage direct includes by a two-way DC-DC converter and is connected to the annular low pressure DC bus on high voltage dc bus, more than one closed-center system, more than one miniature gas turbine, more than one solar-energy photo-voltaic cell, more than one fuel cell, more than one aerogenerator, more than one Unidirectional direct-current-AC converter, more than one two-way DC-DC charge-discharge machine and more than one Unidirectional direct-current-DC converter, wherein, each solar-energy photo-voltaic cell respectively is connected annular low-voltage direct bus by a Unidirectional direct-current-DC converter respectively with each fuel cell, each miniature gas turbine respectively is connected annular low-voltage direct bus by an one-way communication-DC converter respectively with each aerogenerator, each closed-center system respectively connects annular low-voltage direct bus by a two-way DC-DC converter, the output of each Unidirectional direct-current-AC converter connects AC load, the electrokinetic cell of the opposite side connecting electric automobile of each two-way DC-DC charge-discharge machine, the output of each Unidirectional direct-current-DC converter connects DC load.
The micro-electrical network of described low-voltage direct includes by a two-way DC-DC converter and is connected to the radiation low-voltage direct bus on high voltage dc bus, more than one closed-center system, more than one miniature gas turbine, more than one solar-energy photo-voltaic cell, more than one fuel cell, more than one aerogenerator, more than one Unidirectional direct-current-AC converter, more than one two-way DC-DC charge-discharge machine and more than one Unidirectional direct-current-DC converter, wherein, each solar-energy photo-voltaic cell respectively is connected radiation low-voltage direct bus by a Unidirectional direct-current-DC converter respectively with each fuel cell, each miniature gas turbine respectively is connected radiation low-voltage direct bus by an one-way communication-DC converter respectively with each aerogenerator, each closed-center system respectively connects radiation low-voltage direct bus by a two-way DC-DC converter, the output of each Unidirectional direct-current-AC converter connects AC load, the electrokinetic cell of the opposite side connecting electric automobile of each two-way DC-DC charge-discharge machine, the output of each Unidirectional direct-current-DC converter connects DC load.
A kind of DC traction power-supply system of inter-act based on new forms of energy of the present invention, based on distributed power source, to change electricity be main electronlmobil charge-discharge system and the formed DC micro-electric net of the grid-connected changer of two-way exchange-direct current (AC-DC), realized effective utilization of distributed new and the recovery of electric locomotive braking energy; Reduced the fluctuation of DC bus-bar voltage; Utilize pulse duration modulation (PWM) to control the power factor that has improved the AC Bulk Supply Substation, reduced harmonic wave; If distributed power source and to change electricity be that main electronlmobil charge-discharge system capacity is enough large, system can islet operations, thereby improved the power supply reliability of DC traction power-supply system; Take full advantage of DC traction power-supply system and realized the charging of electronlmobil, and then reduced the construction cost of charging system for electric automobile; By the grid-connected changer of two-way exchange-direct current (AC-DC), realize the two-way interaction of electric energy, had the effect of " peak load shifting ", improved the economy of whole system.
The accompanying drawing explanation
Fig. 1 is the structural representation of existing DC traction power-supply system;
Fig. 2 is the structural representation of the DC traction power-supply system of the inter-act based on new forms of energy of two way feeding;
Fig. 3 is the DC traction power-supply system of the inter-act based on the new forms of energy structural representation of one way feeding;
Fig. 4 is annular low pressure DC micro-electric web frame schematic diagram;
Fig. 5 is the micro-electric network composition schematic diagram of radiation low-voltage direct.
In figure
1: traction substation 2: electric locomotive
3: direct current new energy resources system 4: high voltage dc bus
5: ac bus 11: voltage transformer
12: two-way exchange-DC converter 13: DC bus
14: contact system 15: rail
16: section post 31: the micro-electrical network of low-voltage direct
32: two-way DC-DC charge-discharge machine 33: miniature gas turbine
34: one-way communication-DC converter 35: aerogenerator
36: one-way communication-DC converter 37: fuel cell
38: Unidirectional direct-current-DC converter 39: solar-energy photo-voltaic cell
40: Unidirectional direct-current-DC converter
The specific embodiment
Below in conjunction with embodiment and accompanying drawing, a kind of DC traction power-supply system of inter-act based on new forms of energy of the present invention is described in detail.
A kind of DC traction power-supply system of inter-act based on new forms of energy of the present invention, being based on distributed power source, changing electricity is main electronlmobil charge-discharge system and the formed DC micro-electric net of DC traction power-supply system, has proposed a kind of inter-act DC traction power-supply system.
For two way feeding based on two-way exchange-direct current (AC-DC) changer grid-connected inter-act DC traction power-supply system in parallel, as shown in Figure 2, a kind of DC traction power-supply system of inter-act based on new forms of energy of the present invention, include plural for the traction substation 1 of direct current energy is provided to electric locomotive 2, each traction substation 1 has the more than one voltage transformer 11 be connected on ac bus 5, two-way exchange-DC converter 12 of the corresponding connection of the opposite side of each voltage transformer 11, the opposite side of all two-way exchange-DC converter 12 all is connected on the DC bus 13 of the traction substation 1 be positioned at, the both positive and negative polarity of described DC bus 13 is connected respectively contact system 14 and rail 15, the both positive and negative polarity of described electric locomotive 2 is connected respectively contact system 14 and rail 15, electric locomotive is two loads that traction substation is common.On the contact system 14 of each traction substation 1, be connected to a section post 16, the two ends of described section post 16 also connect respectively the positive pole of corresponding DC bus 13.Wherein, voltage transformer can be the three winding transformer of two-winding transformer, three winding transformer or the former limit phase shift adopting extend-triangle and connect ± 7.5 °.Two-way exchange-direct current (AC-DC) changer can be both voltage source converter, can be also current-source convertor; Its modulation system can be pulse duration modulation (PWM); Although in figure, each traction substation has provided two voltage transformers, two two-way exchange-direct currents (AC-DC) changer, its number is not only limited to these.On the DC bus 13 between two adjacent traction substations 1, be provided with by the electronlmobil charge-discharge system, the direct current new energy resources system 3 that the micro-electrical network 31 of distributed power source and the low-voltage direct more than 1 forms, described direct current new energy resources system 3 is connected with the DC bus 13 of adjacent two traction substations 1 by high voltage dc bus 4, thereby in a power supply zone, form the micro-electrical network of direct current annular, wherein said electronlmobil charge-discharge system is to change the electronlmobil charge-discharge system that electricity is the master, to be formed by the charge-discharge machine of the two-way DC-DC for the connecting electric automobile electrokinetic cell 32 more than 1.For improving the dynamic property of system, the mouth of the connecting electric automobile electrokinetic cell of described each two-way DC-DC charge-discharge machine 32 is ultracapacitor in parallel (not shown in FIG.) also.
Described distributed power source includes more than one miniature gas turbine 33, more than one aerogenerator 35, more than one fuel cell 37 and more than one solar-energy photo-voltaic cell 39, wherein, each miniature gas turbine 33 is connected high voltage dc bus 4 by an one-way communication-DC converter 34/36 separately with each aerogenerator 35, and each fuel cell 37 is connected high voltage dc bus 4 by a Unidirectional direct-current-DC converter 38/40 separately with each solar-energy photo-voltaic cell 39.Solar-energy photo-voltaic cell 39 and aerogenerator 35 can adopt maximal power tracing to control according to different situations, also can adopt maximum current to control; One-way communication-DC converter 34/36, Unidirectional direct-current-DC converter 38/40 controlled and can be adopted that the principal and subordinate controls, equity is controlled or droop control, also can adopt hierarchical control.Because map space is limit, for four kinds of distributed power sources, only drawn one as representative in figure; In fact, not restriction of the kind of distributed power source and quantity.
The micro-electrical network of low-voltage direct is connected with the DC bus 13 that is connected contact system with high voltage dc bus 4 by two-way DC-DC (DC-DC) changer 312 successively, it both may operate in and net state, also may operate in from net (or isolated island) state, its version can be both ring type (as Fig. 5), can be also emanant or other forms.
For one way feeding based on two-way exchange-direct current (AC-DC) changer grid-connected inter-act DC traction power-supply system in parallel, as shown in Figure 3, a kind of DC traction power-supply system of inter-act based on new forms of energy of the present invention, include one for the traction substation 1 of direct current energy is provided to electric locomotive 2, traction substation 1 is provided with the more than one voltage transformer 11 be connected on ac bus 5, two-way exchange-DC converter 12 of the corresponding connection of the opposite side of each voltage transformer 11, the opposite side of described two-way exchange-DC converter 12 is connected on the DC bus 13 of traction substation 1, the both positive and negative polarity of described DC bus 13 is connected respectively contact system 14 and rail 15.Wherein, voltage transformer can be the three winding transformer of two-winding transformer, three winding transformer or the former limit phase shift adopting extend-triangle and connect ± 7.5 °.Two-way exchange-direct current (AC-DC) changer 12 can be both voltage source converter, can be also current-source convertor; Its modulation system can be pulse duration modulation (PWM); Although in figure, traction substation has provided two voltage transformers, rectifier and a two-way exchange-direct current (AC-DC) changer, its number is not only limited to these.The both positive and negative polarity of described electric locomotive 2 is connected respectively contact system 14 and rail 15, and electric locomotive is the load of traction substation.On the DC bus 13 of traction substation 1, being provided with by changing electricity is the direct current new energy resources system 3 that the main micro-electrical network 31 of electronlmobil charge-discharge system, distributed power source and the low-voltage direct more than 1 forms, described direct current new energy resources system 3 is connected with the DC bus 13 of traction substation 1 by high voltage dc bus 4, thereby in a power supply zone, form the micro-electrical network of direct current annular, wherein said electronlmobil charge-discharge system is to consist of the charge-discharge machine of the two-way DC-DC for the connecting electric automobile electrokinetic cell 32 more than 1.For improving the dynamic property of system, the mouth of the connecting electric automobile electrokinetic cell of described each two-way DC-DC charge-discharge machine 32 is ultracapacitor in parallel also.
Described distributed power source includes more than one miniature gas turbine 33, more than one aerogenerator 35, more than one fuel cell 37 and more than one solar-energy photo-voltaic cell 39, wherein, each miniature gas turbine 33 is connected high voltage dc bus 4 by an one-way communication-DC converter 34/36 separately with each aerogenerator 35, and each fuel cell 37 is connected high voltage dc bus 4 by a Unidirectional direct-current-DC converter 38/40 separately with each solar-energy photo-voltaic cell 39.
Solar-energy photo-voltaic cell 39 and aerogenerator 35 can adopt maximal power tracing to control according to different situations, also can adopt maximum current to control; The control of one-way communication-DC converter 34/36 and Unidirectional direct-current-DC converter 38/40 can adopt that the principal and subordinate controls, equity is controlled or droop control, also can adopt hierarchical control.Because map space is limit, for four kinds of distributed power sources, only drawn one as representative in figure; In fact, not restriction of the kind of distributed power source and quantity.
The micro-electrical network of low-voltage direct is connected with the DC bus 13 that is connected contact system with high voltage dc bus 4 by two-way DC-DC (DC-DC) changer 312 successively, it both may operate in and net state, also may operate in from net (or isolated island) state, its version can be both ring type (as Fig. 5), can be also emanant or other forms.
Inter-act based on new forms of energy DC traction power-supply system shown in Figure 3, both be applicable to the inter-act DC traction power-supply system of one way feeding, also is applicable to the inter-act DC traction power-supply system of two way feeding.
As shown in Figure 4, Fig. 2 in the present invention, the micro-electrical network 31 of low-voltage direct shown in Fig. 3, include by a two-way DC-DC converter 312 and be connected to the annular low pressure DC bus 311a on high voltage dc bus 4, more than one closed-center system 3110, more than one miniature gas turbine 316, more than one solar-energy photo-voltaic cell 317, more than one fuel cell 318, more than one aerogenerator 319, more than one Unidirectional direct-current-interchange (DC-AC) changer 3111, more than one two-way DC-DC (DC-DC) charge-discharge machine 3112 and more than one Unidirectional direct-current-direct current (DC-DC) changer 3113, wherein, each solar-energy photo-voltaic cell 317 respectively is connected annular low-voltage direct bus 311a by a Unidirectional direct-current-direct current (DC-DC) changer 3117/3116 respectively with each fuel cell 318, each miniature gas turbine 316 respectively is connected annular low-voltage direct bus 311a by an one-way communication-direct current (AC-DC) changer 3114/3115 respectively with each aerogenerator 319, each closed-center system 3110 respectively connects annular low-voltage direct bus 311a by a two-way DC-DC (DC-DC) changer 3118, the output of each Unidirectional direct-current-interchange (DC-AC) changer 3111 connects AC load 313, the electrokinetic cell of the opposite side connecting electric automobile 314 of each two-way DC-DC (DC-DC) charge-discharge machine 3112, the output of each Unidirectional direct-current-direct current (DC-DC) changer 3113 connects DC load 315.
The micro-electrical network of above-mentioned low-voltage direct is connected with the DC bus 13 that is connected contact system with high voltage dc bus 4 by two-way DC-DC (DC-DC) changer 312 successively.Closed-center system 3110 can be both batteries to store energy, can be also ultracapacitor energy storage or other energy storage devices; DC load 315 can be both the LED light equipment, can be also electronic equipment for consumption or other DC load.AC load 313 can be both air-conditioning, can be also laundry machine or other AC load.Two-way DC-DC (DC-DC) electronlmobil charge-discharge machine both can be for pure electric automobile discharges and recharges, and also can discharge and recharge for plug-in hybrid-power automobile or electrokinetic cell.
As shown in Figure 5, Fig. 2 in the present invention, the micro-electrical network 31 of low-voltage direct shown in Fig. 3, can also be to include by a two-way DC-DC converter 312 to be connected to the radiation low-voltage direct bus 311b on high voltage dc bus 4, more than one closed-center system 3110, more than one miniature gas turbine 316, more than one solar-energy photo-voltaic cell 317, more than one fuel cell 318, more than one aerogenerator 319, more than one Unidirectional direct-current-interchange (DC-AC) changer 3111, more than one two-way DC-DC (DC-DC) charge-discharge machine 3112 and more than one Unidirectional direct-current-direct current (DC-DC) changer 3113, wherein, each solar-energy photo-voltaic cell 317 respectively is connected radiation low-voltage direct bus 311b by a Unidirectional direct-current-direct current (DC-DC) changer 3117/3116 respectively with each fuel cell 318, each miniature gas turbine 316 respectively is connected radiation low-voltage direct bus 311b by an one-way communication-direct current (AC-DC) changer 3114/3115 respectively with each aerogenerator 319, each closed-center system 3110 respectively connects radiation low-voltage direct bus 311b by a two-way DC-DC (DC-DC) changer 3118, the output of each Unidirectional direct-current-interchange (DC-AC) changer 3111 connects AC load 313, the electrokinetic cell of the opposite side connecting electric automobile 314 of each two-way DC-DC (DC-DC) charge-discharge machine 3112, the output of each Unidirectional direct-current-direct current (DC-DC) changer 3113 connects DC load 315.
The micro-electrical network of above-mentioned low-voltage direct is connected with the DC bus 13 that is connected contact system with high voltage dc bus 4 by two-way DC-DC (DC-DC) changer 312 successively.Closed-center system can be both batteries to store energy, can be also ultracapacitor energy storage or other energy storage devices; DC load can be both the LED light equipment, can be also electronic equipment for consumption or other DC load.AC load can be both air-conditioning, can be also laundry machine or other AC load.Two-way DC-DC (DC-DC) electronlmobil charge-discharge machine both can be for pure electric automobile discharges and recharges, and also can discharge and recharge for plug-in hybrid-power automobile or electrokinetic cell.
The micro-electrical network 31 of low-voltage direct of the present invention is connected with the DC bus 13 that is connected contact system with high voltage dc bus 4 by two-way DC-DC (DC-DC) changer 312 successively, it both may operate in and net state, also may operate in from net (or isolated island) state, its version can be both ring type (as Fig. 5), can be also emanant or other forms.The grid-connected changer of two-way exchange-direct current (AC-DC), distributed power source, electronlmobil charge-discharge system, the micro-electrical network of low-voltage direct are connected with the DC bus of two traction substations by DC bus, thereby in a power supply zone, form the micro-electrical network of direct current annular.
A kind of DC traction power-supply system of inter-act based on new forms of energy of the present invention, by two-way exchange-direct current (AC-DC) changer, distributed electrical source converter and to change electricity be the braking energy that the coordination of main electronlmobil charge-discharge system controls to take full advantage of distributed power source and electric locomotive, maintain in the scope that DC bus-bar voltage is stabilized in requirement.When the DC traction power-supply system electric energy is superfluous, DC bus-bar voltage raises and reaches the voltage threshold limited, the electronlmobil charge-discharge system utilize unnecessary electric energy by charge-discharge machine to electric automobile power battery charging, unnecessary electric energy in addition feeds back to AC network by two-way exchange-direct current (AC-DC) changer (now being inverter), surpasses limit value to avoid DC bus-bar voltage; When the DC traction power-supply system electric energy is not enough, DC bus-bar voltage is reduced to the voltage threshold limited, two-way exchange-direct current (AC-DC) changer (now being rectifier) becomes direct current energy to DC bus powered by AC energy, electric automobile power battery by charge-discharge machine to DC bus powered, to avoid DC bus-bar voltage lower than limit value, maintain the power balance of system.By appropriate design and coordination, control, the inter-act DC traction power-supply system proposed not only can be realized the highly reliable power supply of high quality, the recycling of electric locomotive braking energy and the stabilizing of DC bus-bar voltage fluctuation of electric locomotive, and can realize the charging of electric automobile power battery and effective utilization of distributed new.
If distributed power source and to change electricity be that main electronlmobil charge-discharge system capacity is enough large, the micro-electrical network of direct current annular not only may operate in and net state, and may operate in from net (or isolated island) state.When the ac power supply system fault, may operate in from net (or isolated island) state, by distributed power source, be that main electronlmobil charge-discharge system is the electric locomotive power supply with changing electricity, thereby improve the reliability of DC traction power-supply system.
In system, the control of changer both can adopt the principal and subordinate to control, and also can adopt equity to control or droop control, can adopt hierarchical control again.In system, control command can be given by communication system by control center, also can be given according to the voltage and current of system.
In a kind of DC traction power-supply system of inter-act based on new forms of energy, the control of changer and structure can have many kinds, specifically by real system, are determined.
Claims (10)
1. DC traction power-supply system of the inter-act based on new forms of energy, include plural for the traction substation (1) of direct current energy is provided to electric locomotive (2), it is characterized in that, each traction substation (1) has the more than one voltage transformer (11) be connected on ac bus (5), corresponding two-way exchange-the DC converter (12) that connects of the opposite side of each voltage transformer (11), the opposite side of all two-way exchange-DC converter (12) all is connected on the DC bus (13) of the traction substation (1) be positioned at, the both positive and negative polarity of described DC bus (13) is connected respectively contact system (14) and rail (15), the both positive and negative polarity of described electric locomotive (2) is connected respectively contact system (14) and rail (15), on the contact system (14) of each traction substation (1), be connected to a section post (16), the two ends of described section post (16) also connect respectively the positive pole of corresponding DC bus (13), on the DC bus (13) between adjacent two traction substations (1), be provided with by the electronlmobil charge-discharge system, the direct current new energy resources system (3) that distributed power source and the micro-electrical network of the low-voltage direct more than 1 (31) form, described direct current new energy resources system (3) is connected with the DC bus (13) of adjacent two traction substations (1) by high voltage dc bus (4), thereby in a power supply zone, form the micro-electrical network of direct current annular, wherein said electronlmobil charge-discharge system is to consist of the charge-discharge machine of the two-way DC-DC for the connecting electric automobile electrokinetic cell (32) more than 1.
2. a kind of DC traction power-supply system of inter-act based on new forms of energy according to claim 1, it is characterized in that, the mouth of the connecting electric automobile electrokinetic cell of described each two-way DC-DC charge-discharge machine (32) is ultracapacitor in parallel also.
3. a kind of DC traction power-supply system of inter-act based on new forms of energy according to claim 1, it is characterized in that, described distributed power source includes more than one miniature gas turbine (33), more than one aerogenerator (35), more than one fuel cell (37) and more than one solar-energy photo-voltaic cell (39), wherein, each miniature gas turbine (33) is connected high voltage dc bus (4) by an one-way communication-DC converter (34/36) separately with each aerogenerator (35), each fuel cell (37) is connected high voltage dc bus (4) by a Unidirectional direct-current-DC converter (38/40) separately with each solar-energy photo-voltaic cell (39).
4. a kind of DC traction power-supply system of inter-act based on new forms of energy according to claim 1, it is characterized in that, the micro-electrical network of described low-voltage direct (31) includes by a two-way DC-DC converter (312) and is connected to the annular low pressure DC bus (311a) on high voltage dc bus (4), more than one closed-center system (3110), more than one miniature gas turbine (316), more than one solar-energy photo-voltaic cell (317), more than one fuel cell (318), more than one aerogenerator (319), more than one Unidirectional direct-current-AC converter (3111), more than one two-way DC-DC charge-discharge machine (3112) and more than one Unidirectional direct-current-DC converter (3113), wherein, each solar-energy photo-voltaic cell (317) respectively is connected annular low-voltage direct bus (311a) by a Unidirectional direct-current-DC converter (3117/3116) respectively with each fuel cell (318), each miniature gas turbine (316) respectively is connected annular low-voltage direct bus (311a) by an one-way communication-DC converter (3114/3115) respectively with each aerogenerator (319), each closed-center system (3110) respectively connects annular low-voltage direct bus (311a) by a two-way DC-DC converter (3118), the output of each Unidirectional direct-current-AC converter (3111) connects AC load (313), the electrokinetic cell of the opposite side connecting electric automobile (314) of each two-way DC-DC charge-discharge machine (3112), the output of each Unidirectional direct-current-DC converter (3113) connects DC load (315).
5. a kind of DC traction power-supply system of inter-act based on new forms of energy according to claim 1, it is characterized in that, the micro-electrical network of described low-voltage direct (31) includes by a two-way DC-DC converter (312) and is connected to the radiation low-voltage direct bus (311b) on high voltage dc bus (4), more than one closed-center system (3110), more than one miniature gas turbine (316), more than one solar-energy photo-voltaic cell (317), more than one fuel cell (318), more than one aerogenerator (319), more than one Unidirectional direct-current-AC converter (3111), more than one two-way DC-DC charge-discharge machine (3112) and more than one Unidirectional direct-current-DC converter (3113), wherein, each solar-energy photo-voltaic cell (317) respectively is connected radiation low-voltage direct bus (311b) by a Unidirectional direct-current-DC converter (3117/3116) respectively with each fuel cell (318), each miniature gas turbine (316) respectively is connected radiation low-voltage direct bus (311b) by an one-way communication-DC converter (3114/3115) respectively with each aerogenerator (319), each closed-center system (3110) respectively connects radiation low-voltage direct bus (311b) by a two-way DC-DC converter (3118), the output of each Unidirectional direct-current-AC converter (3111) connects AC load (313), the electrokinetic cell of the opposite side connecting electric automobile (314) of each two-way DC-DC charge-discharge machine (3112), the output of each Unidirectional direct-current-DC converter (3113) connects DC load (315).
6. DC traction power-supply system of the inter-act based on new forms of energy, include one for the traction substation (1) of direct current energy is provided to electric locomotive (2), it is characterized in that, traction substation (1) is provided with the more than one voltage transformer (11) be connected on ac bus (5), corresponding two-way exchange-the DC converter (12) that connects of the opposite side of each voltage transformer (11), the opposite side of described two-way exchange-DC converter (12) is connected on the DC bus (13) of traction substation (1), the both positive and negative polarity of described DC bus (13) is connected respectively contact system (14) and rail (15), the both positive and negative polarity of described electric locomotive (2) is connected respectively contact system (14) and rail (15), on the DC bus (13) of traction substation (1), be provided with by the electronlmobil charge-discharge system, the direct current new energy resources system (3) that distributed power source and the micro-electrical network of the low-voltage direct more than 1 (31) form, described direct current new energy resources system (3) is connected with the DC bus (13) of traction substation (1) by high voltage dc bus (4), thereby in a power supply zone, form the micro-electrical network of direct current annular, wherein said electronlmobil charge-discharge system is to consist of the charge-discharge machine of the two-way DC-DC for the connecting electric automobile electrokinetic cell (32) more than 1.
7. a kind of DC traction power-supply system of inter-act based on new forms of energy according to claim 6, it is characterized in that, the mouth of the connecting electric automobile electrokinetic cell of described each two-way DC-DC charge-discharge machine (32) is ultracapacitor in parallel also.
8. a kind of DC traction power-supply system of inter-act based on new forms of energy according to claim 6, it is characterized in that, described distributed power source includes more than one miniature gas turbine (33), more than one aerogenerator (35), more than one fuel cell (37) and more than one solar-energy photo-voltaic cell (39), wherein, each miniature gas turbine (33) is connected high voltage dc bus (4) by an one-way communication-DC converter (34/36) separately with each aerogenerator (35), each fuel cell (37) is connected high voltage dc bus (4) by a Unidirectional direct-current-DC converter (38/40) separately with each solar-energy photo-voltaic cell (39).
9. a kind of DC traction power-supply system of inter-act based on new forms of energy according to claim 6, it is characterized in that, the micro-electrical network of described low-voltage direct (31) includes by a two-way DC-DC converter (312) and is connected to the annular low pressure DC bus (311a) on high voltage dc bus (4), more than one closed-center system (3110), more than one miniature gas turbine (316), more than one solar-energy photo-voltaic cell (317), more than one fuel cell (318), more than one aerogenerator (319), more than one Unidirectional direct-current-AC converter (3111), more than one two-way DC-DC charge-discharge machine (3112) and more than one Unidirectional direct-current-DC converter (3113), wherein, each solar-energy photo-voltaic cell (317) respectively is connected annular low-voltage direct bus (311a) by a Unidirectional direct-current-DC converter (3117/3116) respectively with each fuel cell (318), each miniature gas turbine (316) respectively is connected annular low-voltage direct bus (311a) by an one-way communication-DC converter (3114/3115) respectively with each aerogenerator (319), each closed-center system (3110) respectively connects annular low-voltage direct bus (311a) by a two-way DC-DC converter (3118), the output of each Unidirectional direct-current-AC converter (3111) connects AC load (313), the electrokinetic cell of the opposite side connecting electric automobile (314) of each two-way DC-DC charge-discharge machine (3112), the output of each Unidirectional direct-current-DC converter (3113) connects DC load (315).
10. a kind of DC traction power-supply system of inter-act based on new forms of energy according to claim 6, it is characterized in that, the micro-electrical network of described low-voltage direct (31) includes by a two-way DC-DC converter (312) and is connected to the radiation low-voltage direct bus (311b) on high voltage dc bus (4), more than one closed-center system (3110), more than one miniature gas turbine (316), more than one solar-energy photo-voltaic cell (317), more than one fuel cell (318), more than one aerogenerator (319), more than one Unidirectional direct-current-AC converter (3111), more than one two-way DC-DC charge-discharge machine (3112) and more than one Unidirectional direct-current-DC converter (3113), wherein, each solar-energy photo-voltaic cell (317) respectively is connected radiation low-voltage direct bus (311b) by a Unidirectional direct-current-DC converter (3117/3116) respectively with each fuel cell (318), each miniature gas turbine (316) respectively is connected radiation low-voltage direct bus (311b) by an one-way communication-DC converter (3114/3115) respectively with each aerogenerator (319), each closed-center system (3110) respectively connects radiation low-voltage direct bus (311b) by a two-way DC-DC converter (3118), the output of each Unidirectional direct-current-AC converter (3111) connects AC load (313), the electrokinetic cell of the opposite side connecting electric automobile (314) of each two-way DC-DC charge-discharge machine (3112), the output of each Unidirectional direct-current-DC converter (3113) connects DC load (315).
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