CN105762803A - Important-load-contained urban direct current distribution system for accessing new energy and electric cars - Google Patents
Important-load-contained urban direct current distribution system for accessing new energy and electric cars Download PDFInfo
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- CN105762803A CN105762803A CN201610247966.4A CN201610247966A CN105762803A CN 105762803 A CN105762803 A CN 105762803A CN 201610247966 A CN201610247966 A CN 201610247966A CN 105762803 A CN105762803 A CN 105762803A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to an important-load-contained urban direct current distribution system for accessing new energy and electric cars. The important-load-contained urban direct current distribution system includes a bidirectional AC/DC converter, a master breaker/switch, a power battery pack, a DC/DC converter for the power battery pack, at least one photovoltaic power generation battery panel, at least one DC/DC converter for photovoltaic power generation, at least one charging pile, at least one DC/DC converter for the charging pile; one in-station load, one DC/AC inverter for the in-station load, at least one sub breaker/switch, at least one cell distribution box and a resident load, at least one commutation box for an important load and at least one important load. In the situation of unchanging the original power distribution grid line structure and without influence on load power consumption of a user, the important-load-contained urban direct current distribution system for accessing new energy and electric cars only introduces a direct current micro grid system to one side of the power distribution line and utilizes area generation equipment and energy storage equipment to reduce the impact of heavy load on the power grid, and has the advantages of being low in cost, being energy saving and environmentally friendly, being high in reliability, and being high in expandability.
Description
Technical field
Patent of the present invention belongs to power distribution network transmitted power capacity increasing technique field, is specifically related to the city direct-flow distribution system that a kind of new forms of energy containing important load access with electric automobile.
Background technology
Day by day serious along with haze phenomenon, the excess emissions of greenhouse gases, global warming aggravates, atmospheric pollution is serious, electric automobile has been increasingly becoming the direction of high-efficiency cleaning environmental protection, energy-saving and emission-reduction, containment climate warming and the minimizing mankind, the relying party face of traditional fossil energy being possessed the advantage that orthodox car is incomparable, national governments, car manufactures and energy enterprise appeal to greatly develop electric automobile, and then electric automobile becomes study hotspot in recent years.Charging electric vehicle form can be divided into fills and trickle charge two kinds soon, wherein fills soon and generally completes at the charging station of specialty, and charging pile uses high power DC charged form, charge power tens of to hundreds of kilowatts；Therefore, after a large amount of electric automobiles access power distribution network, power distribution network will certainly be formed very big load impact, cause distribution network load overload problem.Existing AC distribution net capacity of trunk is difficult to the capacity of trunk demand met after electric automobile accesses on a large scale, and existing charging pile also is difficult to the demand meeting electric automobile to electrically-charging equipment.In order to meet the electric automobile quantity surge demand to electrically-charging equipment and capacity of trunk, it is necessary to existing electrically-charging equipment scale and distribution line are extended；The demand to power distribution network capacity is accessed, it is necessary to take measures power distribution network is carried out dilatation in order to adapt to high permeability electric automobile.nullAt present，Needs of problems for charging electric vehicle facility，Primary solutions is constantly to set up charging pile quantity in city，The program can solve charging electric vehicle facility needs of problems，But the centrality of the dispersibility of electrically-charging equipment and charging electric vehicle time，Make Charge Management numerous and diverse changeable，User also must grasp the real-time behaviour in service of electrically-charging equipment，With reduce charging waiting time existing city charging pile structural representation as shown in Figure 1，In order to reduce the impact to distribution of a large amount of charging electric vehicle load，Conventional technical scheme is directly power transmission cable to be carried out upgrading，Adopt the cable that conveyance capacity is bigger，Thus realizing the raising of transmission line capability，This method not only quantities is huge，Resident living around involved transformation circuit is affected bigger，There is also cost intensive simultaneously，The problems such as long construction period.
Summary of the invention
For prior art above shortcomings, for solving existing power distribution network transmission line capability and improving scheme and have that cost height, quantities be big, long construction period and to problems such as customer impact are serious.The present invention proposes the city direct-flow distribution system that a kind of new forms of energy containing important load access with electric automobile, when not changing line cord, introduce direct current micro-grid system, adopt generation of electricity by new energy equipment and energy storage device on the spot, power for desirable load, reach to reduce load impact purpose, the program has the advantage not changing transmission line structure, but needing extra some other generation of electricity by new energy equipment of increase, changer and set of cells etc., this direct current micro-grid system is for the increase of power distribution network peak load after electric automobile accesses on a large scale.
The technical solution adopted in the present invention is:
The city direct-flow distribution system that a kind of new forms of energy containing important load access with electric automobile, including:
One transformer station,
At least one tradition load,
One main breaker switch,
At least one connects the community distribution box of point killer switch,
At least one contains the community distribution box of important load, an important load；
Also including an electric automobile charging and conversion electric station, this electric automobile charging and conversion electric station comprises:
One AC/DC two way convertor,
Article one, DC power distribution line DCbus,
One power battery pack connecting DC/DC current transformer,
At least one connects the photovoltaic generation cell panel of a DC/DC current transformer,
One station internal loading connecting DC/AC inverter,
At least one connects the electric automobile charging pile of the 2nd DC/DC current transformer；
Described transformer station is connected with the ac bus ACbus of AC/DC two way convertor, tradition load；
The DC side of described AC/DC two way convertor is connected with dc bus DCbus, and the AC of AC/DC two way convertor is connected with transformer station；
The low-pressure side of described DC/DC current transformer is connected with power battery pack, and the high-pressure side of DC/DC current transformer is connected with dc bus DCbus；
The low-pressure side of a described DC/DC current transformer is connected with photovoltaic generation cell panel, and the high-pressure side of a DC/DC current transformer is connected with dc bus DCbus；
The AC of described DC/AC inverter is connected with station internal loading, and the DC side of DC/AC inverter is connected with dc bus DCbus；
The low-pressure side of described 2nd DC/DC current transformer is connected with electric automobile charging pile, and the high-pressure side of the 2nd DC/DC current transformer is connected with dc bus DCbus；
Described main breaker switch is located at substation exit side, is then connected with AC/DC two way convertor and community distribution box and the important load containing important load community distribution box again；
The side of described point of killer switch is connected with the traditional load being connected community distribution box, and the opposite side of point killer switch is connected with ac bus ACbus.
Described is connected with important load containing distribution box side, important load community, and opposite side is connected with ac bus ACbus.
The a set of direct current distribution network systems containing AC/DC two way convertor of this system access, this system can utilize internal generation of electricity by new energy and energy storage device to power, and reaches to stablize grid-connected again through AC/DC two way convertor.
This system emphasis take into account the power supply reliability problem of community important load, has installed chopper/switch respectively additional, to guarantee the power supply reliability of important load in the total line of power distribution network and in user's change of current case of branch road.
Introduce direct-flow distribution system, electric automobile charging pile etc. in described resident's impregnable situation of tradition load and can absorb electric energy from photovoltaic generation, important load change of current case and AC/DC two way convertor are diconnected, and photovoltaic generation cell panel and power battery pack can to important load foldback electric energy.
Electric energy transmission in this system is direct current energy form.
Compared to the technology of existing raising distribution network line transmission line capability, the city direct-flow distribution system that a kind of new forms of energy containing important load of the present invention access with electric automobile, have the advantage that
1), the present invention without changing first wife's power network line structure, and without changing or the cable that uses of existing power distribution network of upgrading.
2), transmission line of electricity capacity without promoting, required extra duty can be supplied by clean energy resource generating and the energy-storage system introduced in direct-current micro-grid, to meet demand to distribution line capacity after different scales electric automobile accesses.
3), in the present invention, two-way AC/DC current transformer adopts bi-directional configuration, it may be achieved electric energy is counter to be sent, the electrical energy demands of reply fault etc. important load in emergency circumstances or tradition load.
4), the present invention is equiped with main breaker/switch and user's branch road divides chopper/switch, can when distribution network systems break down, each chopper of control on demand/switch on-off, to be down to minimum by fault on the impact of power distribution network.
5), the present invention only need to introduce a set of direct current micro-grid system containing new forms of energy in existing distribution system, quantities is little, it is achieved convenient, and feasibility is high.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of existing alternating-current system.
Fig. 2 is the structural representation that the present invention is applicable to the new forms of energy access charging station direct-flow distribution system embodiment containing important load.
Detailed description of the invention
As in figure 2 it is shown, the city direct-flow distribution system that a kind of new forms of energy containing important load access with electric automobile, including:
One transformer station 1,
At least one tradition load 13, tradition load 13 refers to present stage employing 220V and exchanges the load that residential electricity consumption is powered.
One main breaker switch 14,
At least one connects the community distribution box 12 of point killer switch 15,
At least one contains 12, important load of community distribution box of important load；
Also including an electric automobile charging and conversion electric station, this electric automobile charging and conversion electric station comprises:
One AC/DC two way convertor 2,
Article one, DC power distribution line DCbus3,
One power battery pack 8 connecting DC/DC current transformer 4,
At least one connects the photovoltaic generation cell panel 9 of a DC/DC current transformer 5,
One station internal loading 10 connecting DC/AC inverter 6,
At least one connects the electric automobile charging pile 11 of the 2nd DC/DC current transformer 7；
Described transformer station 1 is connected with the ac bus ACbus of AC/DC two way convertor 2, tradition load；
The DC side of described AC/DC two way convertor 2 is connected with dc bus DCbus3, and the AC of AC/DC two way convertor 2 is connected with transformer station 1；
The low-pressure side of described DC/DC current transformer 4 is connected with power battery pack 8, and the high-pressure side of DC/DC current transformer 4 is connected with dc bus DCbus3；
The low-pressure side of a described DC/DC current transformer 5 is connected with photovoltaic generation cell panel 9, and the high-pressure side of a DC/DC current transformer 5 is connected with dc bus DCbus3；
The AC of described DC/AC inverter 6 is connected with station internal loading 10, and the DC side of DC/AC inverter 6 is connected with dc bus DCbus3；
The low-pressure side of described 2nd DC/DC current transformer 7 is connected with electric automobile charging pile 11, and the high-pressure side of the 2nd DC/DC current transformer 7 is connected with dc bus DCbus3；
Described main breaker switch 14 is located at transformer station 1 outlet side, is then connected with AC/DC two way convertor 2 and community distribution box 12 and the important load containing important load community distribution box again；
The side of described point of killer switch 15 is connected with the traditional load 13 being connected community distribution box 12, and the opposite side of point killer switch 15 is connected with ac bus ACbus.
Described is connected with important load containing distribution box side, important load community, and opposite side is connected with ac bus ACbus.
Transformer station 1 10kVAC rectification out is that 800VDC is transferred to dc bus DCbus3 by AC/DC two way convertor 2；800VDC inversion is that 220VAC is for station internal loading by DC/AC inverter 6；800VDC blood pressure lowering is that 380VDC is for charging pile by the 2nd DC/DC current transformer 7.By the boosting of photovoltaic generation cell panel 9 electricity, for the grid-connected use of 800VDC, also or be depressurized to power battery pack 8 by DC/DC changer 4 stores oneth DC/DC current transformer 5.Community distribution box 12 by 10kVAC blood pressure lowering be 220VAC for resident, the distribution box effect of important load community is identical.Other each branch road circuits, when circuit failed shorted, are disconnected, it is ensured that electrical network and the direct-current micro-grid power supply to important load by chopper/switch.
The mode of operation of the present invention has following several:
1, when systems are functioning properly, the alternating current of external communication network is unidirectional current through AC/DC two way convertor 2 rectification, then through transmission line of electricity in DC distribution net and DC/DC changer 4, DC/AC inverter the 6, the 2nd DC/DC changer 7, electric energy is supplied respectively to power battery pack 8, stand internal loading 10 and electric automobile charging pile 11.Same external communication network directly powers to tradition load and important load by community distribution box.
2, when power distribution network breaks down, point killer switch 15 in main breaker switch 14 and user's branch road is controlled according to position of failure point.When the power supply main line part at power distribution network occurs fault, namely during external communication network failure, main breaker switch 14 disconnects immediately, disengagement failure district contacts with non-faulting district, simultaneously the branch road containing photovoltaic generation cell panel 9 and power battery pack 8 by two-way AC/DC current transformer 2 to the anti-power transmission energy of important load, and without in the branch road of important load, photovoltaic generation cell panel 9 and power battery pack 8 are still powered to traditional load 13 of place branch road by two-way AC/DC current transformer 2, ensure that in emergency circumstances all load electricity consumptions are unaffected in community as far as possible；When the photovoltaic cell 9 only relied in direct-current micro-grid branch road and the anti-electric energy sent of power battery pack 8 are not sufficient to ensure that the need for electricity of important load, cut off point killer switch 15 in the user's branch road without important load, excision tradition load 13, energy storage supply important load in photovoltaic generation 9 and power battery pack 8, preferentially meet the need for electricity of important load, it is ensured that the duty of important load is unaffected.When Failure elimination, distribution network restoration normal operation, the electric energy of power distribution network is provided by external network again, and now power battery pack 8 is dissolved and storing electrical energy.
3, when in power distribution network, certain user's branch road breaks down, point killer switch 15 of open failure place branch road, separates fault branch with distribution immediately, and other non-faulting resident's branch road is not then affected by fault branch and keeps normal operating conditions；When, after the failture evacuation of fault branch, again through controlling a point killer switch 15, this branch road being put into distribution network system again, to reducing the impact that distribution is run by fault as far as possible.
In the specific embodiment of the invention shown in Fig. 2, changer and the electric pressure of DC/DC changer the 4, the oneth DC/DC changer 5 and the 2nd DC/DC changer 7, DC/AC inverter 6 in the transformator of AC/DC two way convertor 2, community distribution box 12 connection, important load change of current case are all designed with an example and set forth, can select according to real system capacity requirement and determine electric pressure in actual applications.
In sum, the direct-flow distribution system of the present invention is not changing first wife's power network line structure, and without changing or upgrading cable, when not affecting aborigines' load electricity consumption, use new cleaning fuel generating and energy storage device to supply electric automobile as power supply source and access required overhead provision in a large number, have first wife's electric line loss little, energy-conserving and environment-protective, reliability is high, the advantage that extensibility is good, and the amplitude of institute's lifting power distribution network transmission line capability is fully able to the demand meeting electric automobile scale access to power distribution network transmission capacity, it it is the access city direct-flow distribution system of a kind of new forms of energy being applicable to containing important load and electric automobile.
The above-mentioned enforcement example of the present invention is only for example of the present invention is described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, other multi-form change and variations can also be made on the basis of the above description.Here cannot all of embodiment be given exhaustive.Every belong to apparent change that technical scheme amplified out or the variation row still in protection scope of the present invention.
Claims (5)
1. the city direct-flow distribution system that the new forms of energy containing important load access with electric automobile, it is characterised in that including:
One transformer station (1),
At least one tradition load (13),
One main breaker switch (14),
At least one connects the community distribution box (12) of point killer switch (15),
At least one contains the community distribution box (12) of important load, an important load；
Also including an electric automobile charging and conversion electric station, this electric automobile charging and conversion electric station comprises:
One AC/DC two way convertor (2),
Article one, DC power distribution line DCbus(3),
One power battery pack (8) connecting DC/DC current transformer (4),
At least one connects the photovoltaic generation cell panel (9) of a DC/DC current transformer (5),
One station internal loading (10) connecting DC/AC inverter (6),
At least one connects the electric automobile charging pile (11) of the 2nd DC/DC current transformer (7)；
Described transformer station (1) is connected with the ac bus ACbus of AC/DC two way convertor (2), tradition load；
The DC side of described AC/DC two way convertor (2) and dc bus DCbus(3) it is connected, the AC of AC/DC two way convertor (2) is connected with transformer station (1)；
The low-pressure side of described DC/DC current transformer (4) is connected with power battery pack (8), the high-pressure side of DC/DC current transformer (4) and dc bus DCbus(3) it is connected；
The low-pressure side of a described DC/DC current transformer (5) is connected with photovoltaic generation cell panel (9), the high-pressure side of a DC/DC current transformer (5) and dc bus DCbus(3) it is connected；
The AC of described DC/AC inverter (6) is connected with station internal loading (10), the DC side of DC/AC inverter (6) and dc bus DCbus(3) it is connected；
The low-pressure side of described 2nd DC/DC current transformer (7) is connected with electric automobile charging pile (11), the high-pressure side of the 2nd DC/DC current transformer (7) and dc bus DCbus(3) it is connected；
Described main breaker switch (14) is located at transformer station 1 outlet side, is then connected with AC/DC two way convertor (2) and community distribution box (12) and the important load containing important load community distribution box again；
The side of described point of killer switch (15) is connected with the traditional load (13) being connected community distribution box (12), and the opposite side of point killer switch (15) is connected with ac bus ACbus；
Described is connected with important load containing distribution box side, important load community, and opposite side is connected with ac bus ACbus.
2. the city direct-flow distribution system that a kind of new forms of energy containing important load access with electric automobile according to claim 1, it is characterized in that, access a set of direct current distribution network systems containing AC/DC two way convertor 2, this system can utilize internal generation of electricity by new energy and energy storage device to power, and reaches to stablize grid-connected again through AC/DC two way convertor 2.
3. the city direct-flow distribution system that a kind of new forms of energy containing important load access with electric automobile according to claim 1, it is characterized in that, described direct-flow distribution system emphasis take into account the power supply reliability problem of community important load, chopper/switch has been installed respectively additional, to guarantee the power supply reliability of important load in the total line of power distribution network and in user's change of current case of branch road.
4. the city direct-flow distribution system that a kind of new forms of energy containing important load access with electric automobile according to claim 1, it is characterized in that, introduce direct-flow distribution system, electric automobile charging pile etc. in described resident's impregnable situation of tradition load and can absorb electric energy from photovoltaic generation, important load change of current case and AC/DC two way convertor (2) are diconnected, and photovoltaic generation cell panel and power battery pack can to important load foldback electric energy.
5. the city direct-flow distribution system that a kind of new forms of energy containing important load access with electric automobile according to claim 1, it is characterised in that the electric energy transmission in described direct-flow distribution system is direct current energy form.
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| CN201610247966.4A CN105762803A (en) | 2016-04-20 | 2016-04-20 | Important-load-contained urban direct current distribution system for accessing new energy and electric cars |
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| CN106786730A (en) * | 2016-11-25 | 2017-05-31 | 云南电网有限责任公司电力科学研究院 | A kind of new microgrid topological structure for extensive electric automobile |
| CN107465205A (en) * | 2017-09-20 | 2017-12-12 | 重庆聚陆新能源有限公司 | A kind of direct current micro-grid system based on DC/DC converter time-sharing multiplexs |
| WO2018103231A1 (en) * | 2016-12-08 | 2018-06-14 | 中山大洋电机股份有限公司 | New energy micro-grid electric vehicle charging station |
| WO2018103230A1 (en) * | 2016-12-08 | 2018-06-14 | 中山大洋电机股份有限公司 | New energy micro-grid electric vehicle charging station |
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| CN111231713A (en) * | 2020-03-27 | 2020-06-05 | 上海电气集团股份有限公司 | Electric automobile charging and discharging system and control method |
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| CN110048379A (en) * | 2019-04-10 | 2019-07-23 | 国网江苏省电力有限公司南通供电分公司 | The relaying configuration method of low-voltage direct distribution system |
| CN114007894A (en) * | 2019-06-30 | 2022-02-01 | 詹姆斯·阮 | Quick charging battery pack and quick charging method thereof |
| CN111384752A (en) * | 2020-03-16 | 2020-07-07 | 深圳供电局有限公司 | Power distribution device, power distribution system and power distribution method |
| CN111231713A (en) * | 2020-03-27 | 2020-06-05 | 上海电气集团股份有限公司 | Electric automobile charging and discharging system and control method |
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Application publication date: 20160713 |