CN116599203B - Power exchange station and uninterrupted power supply method thereof - Google Patents
Power exchange station and uninterrupted power supply method thereof Download PDFInfo
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- CN116599203B CN116599203B CN202310828020.7A CN202310828020A CN116599203B CN 116599203 B CN116599203 B CN 116599203B CN 202310828020 A CN202310828020 A CN 202310828020A CN 116599203 B CN116599203 B CN 116599203B
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000006243 chemical reaction Methods 0.000 claims abstract description 180
- 230000009977 dual effect Effects 0.000 claims description 29
- 230000005611 electricity Effects 0.000 claims description 29
- 238000004146 energy storage Methods 0.000 claims description 22
- 230000003068 static effect Effects 0.000 claims description 12
- 230000002457 bidirectional effect Effects 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 8
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000004891 communication Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 9
- 230000008859 change Effects 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 206010033799 Paralysis Diseases 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001386 lithium phosphate Inorganic materials 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 description 1
Classifications
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/80—Exchanging energy storage elements, e.g. removable batteries
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a power exchange station and an uninterrupted power supply method thereof, wherein the power exchange station comprises: an alternating current bus, a power conversion control system, a power conversion robot, an inverter and a power conversion battery; the power conversion control system and the power conversion robot are electrically connected with the alternating current bus; the battery is electrically connected with the alternating current bus through the inverter; the alternating current bus is electrically connected with a power supply grid of the power exchange station, and a grid-connected switch is arranged between the alternating current bus and the power supply grid; when the power supply grid is powered off, the grid-connected switch is disconnected, the inverter takes power from the power exchange battery and supplies power to the alternating current bus, and the power exchange battery is used for supplying power to the power exchange robot. By adopting the technical scheme, when the power supply grid is powered off, the inverter is used for taking power from the power conversion battery, so that the power conversion battery can supply power to the power conversion robot, the normal operation of the power conversion robot can be maintained, the power conversion process of the new energy automobile in power conversion can be finished, and the hardware cost and maintenance cost of the power conversion station are reduced.
Description
Technical Field
The invention relates to the technical field of new energy automobile charging and power conversion, in particular to a power conversion station and an uninterrupted power supply method thereof.
Background
New energy automobiles are having an increasingly wide market under the large flag of national strategy encouraging the use of clean energy automobiles. In China, new energy automobiles gradually become the focus of automobile industry and energy industry development, and along with popularization of the new energy automobiles, how to effectively and rapidly solve the problem that charging and changing of the new energy automobiles are the most attention at present.
When the power supply network is powered off, as shown in fig. 1, the small UPS power supply only can supply power to the power conversion control system, but cannot supply power to the power conversion robot, the power conversion robot cannot normally operate, power conversion is terminated, and the new energy automobile under power conversion is paralyzed in the power conversion station. After the power supply network is powered off, the operation of the power conversion station can be greatly influenced, and the battery replacement of a new energy automobile needing power conversion can be delayed.
Therefore, how to continuously ensure the new energy automobile to replace the battery after the power supply grid is powered off has very important significance for the actual operation of the power exchange station.
Disclosure of Invention
The invention provides a power exchange station and an uninterrupted power supply method thereof, which are used for solving the problem that a power exchange robot cannot normally operate and cannot guarantee the power exchange of a new energy automobile after a power supply grid is powered off.
According to an aspect of the present invention, there is provided a power exchange station comprising: an alternating current bus, a power conversion control system, a power conversion robot, an inverter and a power conversion battery;
the power conversion control system and the power conversion robot are electrically connected with the alternating current bus; the power conversion battery is electrically connected with the alternating current bus through the inverter; the alternating current bus is electrically connected with a power supply grid of the power exchange station, and a grid-connected switch is arranged between the alternating current bus and the power supply grid;
when the power supply grid is powered off, the grid-connected switch is turned off, and the inverter takes power from the power conversion battery and supplies power to the alternating current bus, so that the power conversion battery supplies power to the power conversion robot.
Optionally, the method further comprises: a UPS power supply;
the power conversion control system is electrically connected with the alternating current bus through the UPS.
Optionally, the method further comprises: a dual power switch;
the power conversion control system and the power conversion robot are electrically connected with the alternating current bus through the dual power switch; the power conversion control system and the power conversion robot are also electrically connected with the inverter through the dual power switch;
when the power supply grid is powered off, the dual power switch is connected with the inverter, the power conversion control system and the power conversion robot.
Optionally, the inverter includes an ac/dc converter and a dc/ac converter;
the input end of the alternating current/direct current converter is electrically connected with the alternating current bus; the output end of the alternating current/direct current converter is electrically connected with the battery; the input end of the direct current/alternating current converter is electrically connected with the battery; the output end of the direct-current/alternating-current converter is electrically connected with the dual-power switch;
when the power supply grid is powered off, the AC/DC converter stops working, the DC/AC converter works, and the battery of the power conversion discharges.
Optionally, the inverter includes a charging device and a dc/ac converter;
the input end of the charging equipment is electrically connected with the alternating current bus; the output end of the charging equipment is electrically connected with the battery; the input end of the direct current/alternating current converter is electrically connected with the battery; the output end of the direct-current/alternating-current converter is electrically connected with the dual-power switch;
when the power supply grid is powered off, the charging equipment stops working, the direct/alternating current converter works, and the battery for replacing electricity discharges.
Optionally, the dual power switch comprises an STS static transfer switch;
a first input end of the STS static change-over switch is electrically connected with the alternating current bus; a second input end of the STS static change-over switch is electrically connected with the inverter; and the output end of the STS static change-over switch is electrically connected with the power conversion control system and the power conversion control system.
Optionally, the inverter comprises an energy storage converter;
and when the power supply grid is powered off, the energy storage converter discharges the battery.
According to another aspect of the present invention, there is provided a method for uninterruptible power supply of a power exchange station, applied to the power exchange station described above;
the uninterrupted power supply method of the power exchange station comprises the following steps:
acquiring state information of the power supply grid;
judging whether the power supply of the power supply grid is interrupted or not according to the state information;
if yes, the connection between the alternating current bus and the power supply grid is disconnected, the inverter is controlled to take electricity from the electricity changing battery, and the electricity changing battery supplies power for the electricity changing robot.
Optionally, the power exchange station further comprises a dual power switch;
the power conversion control system and the power conversion robot are electrically connected with the alternating current bus through the dual power switch; the power conversion control system and the power conversion robot are also electrically connected with the inverter through the dual power switch;
controlling the inverter to take power from the power conversion battery to supply power for the power conversion robot, comprising:
and controlling the inverter to take electricity from the battery replacement battery, controlling the dual-power switch to connect the inverter with the battery replacement control system and the battery replacement robot, and supplying power to the battery replacement robot by the battery replacement battery.
Optionally, the inverter includes an ac/dc converter and a dc/ac converter;
the input end of the alternating current/direct current converter is electrically connected with the alternating current bus; the output end of the alternating current/direct current converter is electrically connected with the battery; the input end of the direct current/alternating current converter is electrically connected with the battery; the output end of the direct-current/alternating-current converter is electrically connected with the dual-power switch;
controlling the inverter to draw power from the battery, comprising:
and controlling the AC/DC converter to stop working and controlling the DC/AC converter to work so as to take electricity from the battery.
According to the technical scheme, the power conversion control system and the power conversion robot are electrically connected with an alternating current bus of the power conversion station, the power conversion battery is electrically connected with the alternating current bus through the inverter, when the power supply grid is powered off, the inverter can take power from the power conversion battery, the power conversion battery is used for supplying power to the power conversion robot, and the power supply to the power conversion robot is realized, so that the normal operation of the power conversion robot can be maintained when the power supply grid is powered off, the power conversion process of a new energy automobile under power conversion can be ensured, and the hardware cost and maintenance cost of the power conversion station are reduced; meanwhile, when the power supply grid is powered off, the grid-connected switch is disconnected, so that the connection between the power supply grid and the alternating current bus can be disconnected, the consumption of electric energy of a power supply battery by other equipment connected with the power supply grid is avoided, the energy consumption of the power exchange battery can be reduced, and the power exchange robot of the power exchange station can be ensured to normally operate when the power supply grid is powered off.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art power exchange station;
FIG. 2 is a schematic diagram of another prior art power exchange station;
FIG. 3 is a schematic diagram of a power exchange station according to an embodiment of the present invention;
FIG. 4 is a schematic view of another power exchange station according to an embodiment of the present invention;
FIG. 5 is a schematic view of another power exchange station according to an embodiment of the present invention;
FIG. 6 is a schematic view of another power exchange station according to an embodiment of the present invention;
FIG. 7 is a schematic view of another power exchange station according to an embodiment of the present invention;
fig. 8 is a schematic flow chart of an uninterruptible power supply method of a power exchange station according to an embodiment of the present invention;
FIG. 9 is a schematic flow chart of a method for uninterruptible power supply of a further power exchange station according to an embodiment of the present invention;
fig. 10 is a schematic flow chart of a method for uninterruptible power supply of another power exchange station according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without making any inventive effort are intended to fall within the scope of the present invention. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Fig. 3 is a schematic structural diagram of a power exchange station according to an embodiment of the present invention. Referring to fig. 3, the power exchange station includes: an ac bus 01, a battery-changing control system 10, a battery-changing robot 20, an inverter 30, and a battery-changing cell 40. The power conversion control system 10 and the power conversion robot 20 are electrically connected with the alternating current bus 01; the battery 40 is electrically connected with the ac bus 01 through the inverter 30; the alternating current bus 01 is electrically connected with a power supply grid of the power exchange station, and a grid-connected switch 11 is arranged between the alternating current bus 01 and the power supply grid.
Wherein the grid-tie switch 11 is a tie-down switch of the power grid and the ac bus 01, including but not limited to a relay, in an alternative embodiment an ac transformer 12 is provided between the power grid and the grid-tie switch 11. The power conversion control unit system 10 includes a sensor and a controller, which can monitor and control the charging/power conversion state, the battery state, the environment state, the network communication state, etc. of the power conversion station, in an alternative embodiment, the sensor is in communication connection with the controller, for example, interaction can be implemented through a protocol interface, and the controller can control the working states of the grid-connected switch 11, the inverter 30, etc. The battery replacement control unit system 10 may also be used to monitor the status of a power grid, for example, may monitor power on or off in real time. The battery replacing robot 20 comprises mechanical devices such as a mechanical arm and a mechanical claw, and can take out the battery with insufficient power in the new energy automobile and put the battery into the battery replacing 40 in a full power state, wherein the new energy automobile comprises, but is not limited to, automobiles such as a household automobile, a bus, a heavy truck and the like. The inverter 30 includes, but is not limited to, an inverter, a transformer, etc. that can perform voltage conversion for charging and discharging the battery 40. The battery 40 comprises a ternary lithium battery, a lithium phosphate battery and other batteries with higher energy density and more energy storage, and can supply power to the battery replacing robot 20 when the power supply network is powered off, so that the battery replacing robot 20 can operate normally.
It will be appreciated that the battery replacement control system is communicatively or electrically coupled to the inverter (not shown) such that the battery replacement control system may control the inverter to charge and discharge the battery replacement.
Specifically, the working power sources of the battery-changing control unit system 10 and the battery-changing robot 20 are both ac, and the electrical signals when the battery-changing battery 40 is charged and discharged are dc. When the power supply grid is powered off, the power conversion control unit system 10 can detect that the power supply grid is powered off, control the inverter 30 to take power from the power conversion battery 40, convert direct current of the power conversion battery 40 into alternating current, and supply power to the power conversion robot 20 through the alternating current bus, so that the power conversion battery 40 supplies power to the power conversion robot 20.
The ac bus 01 may be electrically connected to a power supply grid through the ac transformer 12 and the grid-connected switch 11, where the ac transformer 12 may convert high-voltage ac in the power supply grid into low-voltage ac that may be used by a power conversion station, and in order to improve safety and stability of power transmission, the grid-connected switch 11 is disposed between the ac transformer 12 and the ac bus 01, and the grid-connected switch 11 includes a circuit switch such as a relay. When the power supply grid is electrified, the power supply grid can provide 10KV alternating current, the alternating current transformer 12 can convert the 10KV alternating current into 0.4KV alternating current, the 0.4KV alternating current is transmitted to the alternating current bus 01 through the grid-connected switch 11, the power supply grid can supply power to the alternating current control system 10 and the alternating current robot 20, and the inverter 30 can convert the alternating current of the alternating current bus 01 into direct current to charge the alternating current battery 40. When the power supply grid is powered off, the power conversion control system 10 controls the inverter 30 to take power from the power conversion battery 40, converts direct current of the power conversion battery 40 into alternating current, transmits the alternating current to the alternating current bus 01, and the power conversion battery 40 supplies power to the power conversion control system 10 and the power conversion robot 20 to realize uninterrupted power supply; meanwhile, when the power supply grid is powered off, the grid-connected switch is controlled to be turned off by the power conversion control system 10, so that the connection between the power supply grid and the alternating current bus 01 can be disconnected, other equipment connected with the power supply grid is prevented from consuming the electric energy of the power supply battery 40, the energy consumption of the power conversion battery is increased, the time for supplying power to the power conversion robot 20 by the power conversion battery 40 can be increased, and the normal operation of the power conversion robot of the power conversion station can be ensured when the power supply grid is powered off.
It should be noted that, the power supply grid outage includes situations such as power supply grid outage, ac transformer fault disconnection, grid-connected switch abnormal disconnection, and the like, and situations that the power supply grid cannot transmit electric energy to the ac bus belong to power supply grid outage.
According to the embodiment of the invention, the replacement electric control system and the motor replacement robot are arranged to be electrically connected with the alternating current bus of the power replacement station, the power replacement battery is electrically connected with the alternating current bus through the inverter, when the power supply grid is powered off, the inverter can take power from the power replacement battery, and the power replacement battery is used for supplying power to the power replacement robot, so that the normal operation of the motor replacement robot can be maintained and supported when the power supply grid is powered off, the power replacement process of a new energy automobile under power replacement can be ensured, and the hardware cost and maintenance cost of the power replacement station are reduced; meanwhile, when the power supply grid is powered off, the grid-connected switch is disconnected, so that the connection between the power supply grid and the alternating current bus can be disconnected, the consumption of electric energy of a power supply battery by other equipment connected with the power supply grid is avoided, the energy consumption of the power exchange battery can be reduced, and the power exchange robot of the power exchange station can be ensured to normally operate when the power supply grid is powered off.
In an alternative embodiment, the inverter comprises an energy storage converter; the power conversion control system is connected with the control end of the energy storage converter; the energy storage converter is also connected with the communication end of the battery. The energy storage converter is used for controlling the charging process and the discharging process of the battery and converting alternating current/direct current or direct current/alternating current; the power conversion control system can control the energy storage converter to charge the power conversion battery when the power supply grid is electrified; the power conversion control system can also control the energy storage converter to discharge the power conversion battery when the power supply grid is powered off.
The energy storage converter is a single-stage energy storage converter, when the power supply grid is powered off, the single-stage energy storage converter can communicate with the battery replacement through the communication interface and the communication end, state information of the battery replacement is obtained, the battery replacement is subjected to protective discharge, and therefore the battery replacement is reversely powered for the battery replacement robot, and normal operation of the battery replacement robot is guaranteed. In addition, the single-stage energy storage converter is used as temporary power supply equipment of the power exchange station in the power exchange station, uninterrupted power supply of the power exchange station to the power exchange robot can be ensured, and the stability of a power supply system of the whole power exchange station can be improved while the equipment input cost is reduced.
Optionally, fig. 4 is a schematic structural diagram of another power exchange station according to an embodiment of the present invention. Referring to fig. 4, the power conversion station further includes a UPS power source 50, and the power conversion control system 10 is electrically connected to the ac bus 01 through the UPS power source 50.
The UPS power source 50 may be a small UPS power source, and includes a battery and an inverter, and may supply ac power of the ac bus 01 to the power conversion control system 10 after stabilizing the voltage, and charge the built-in battery; the UPS power source 50 can also convert the electric energy of the storage battery into ac power and supply power to the power conversion control system 10 when the power supply network is powered off, so as to maintain the normal operation of the power conversion control system 10.
For example, the UPS power source 50 may convert 0.4KV ac in the ac grid to a stable 220V ac power for the power conversion control system 10 when the power grid is energized. When the power supply grid is powered off, the UPS power source 50 can supply power to the power conversion control system 10, so that the power conversion control system 10 can operate uninterruptedly, and the power conversion control system 10 can monitor the power supply grid for power off and control the inverter 30 to take power from the power conversion battery 40 during the power supply grid for power off; meanwhile, the battery 40 can charge the UPS 50, so as to avoid the situation that the UPS 50 cannot operate due to insufficient energy storage of the UPS 50, and improve the emergency capability of the battery under emergency.
In addition, the UPS power source 50 can also supply power to the power conversion robot 20 in the initial stage of power failure of the power supply network, so that the power conversion robot 20 can run uninterruptedly, and the UPS power source 50 can also supply power to the power conversion control system 10 and the power conversion robot 20 when the power supply network is powered off and the power conversion battery 40 is deficient, so that the situation that the power conversion robot 20 cannot run normally due to insufficient power of the power conversion battery 40 is avoided, and the power conversion is terminated and the new energy automobile which is in power conversion is paralyzed in the power conversion station.
Optionally, fig. 5 is a schematic structural diagram of another power exchange station according to an embodiment of the present invention. Referring to fig. 5, the power exchange station further includes a dual power switch 60, and the power exchange control system 10 and the power exchange robot 20 are electrically connected to the ac bus 01 through the dual power switch 60; the battery replacement control system 10 and the battery replacement robot 20 are also electrically connected to the inverter 30 through a dual power switch 60.
The dual power switch 60 is an electrical switch, and can be connected to two power sources simultaneously, and can switch the circuit from one power source to another power source, so as to ensure continuous power supply of the circuit.
Specifically, one of the power supplies of the dual power switch 60 is a power supply grid, and the first power supply end of the dual power switch 60 is electrically connected with the power supply grid through an ac bus 01; the other power supply of the double power switch 60 is a battery 40, and the second power supply end of the double power switch 60 is electrically connected with the battery 40 through the inverter 30; the output of the dual power switch 60 is electrically connected to the power change control system 10 and the power change robot 20. By arranging the dual power switch 60, the power supply grid can be used for supplying power to the power conversion control system 10 and the power conversion robot 20 when the power supply grid is electrified, and the power conversion battery 40 can be used for supplying power to the power conversion control system 10 and the power conversion robot 20 when the power supply grid is deenergized, so that the phenomenon of short circuit or overload of the power supply can be avoided, the power supply damage can be caused, the circuit oscillation, the large change of voltage and the like caused by the phase difference between the dual power supplies can be avoided, and the reliability of the power conversion station can be improved.
In an alternative embodiment, the dual power switch comprises an STS static transfer switch having a first power terminal electrically connected to the ac bus; the second power end of the STS static change-over switch is electrically connected with the inverter; the output end of the STS static change-over switch is electrically connected with the power change control system and the power change robot. The STS static change-over switch can instantly and tangentially switch to an inverter electrically connected with the second power supply end when the voltage of an alternating current bus electrically connected with the first power supply end is insufficient, and adopts a battery to supply power, and switches back to the alternating current bus electrically connected with the first power supply end when the voltage of the alternating current bus electrically connected with the first power supply end is recovered to be normal, and continuously adopts a power supply grid to supply power.
Optionally, fig. 6 is a schematic structural diagram of another power exchange station according to an embodiment of the present invention. Referring to fig. 6, the inverter 30 includes an ac/dc converter 31 and a dc/ac converter 32. The input end of the AC/DC converter 31 is electrically connected with the AC bus 01; the output end of the AC/DC converter 31 is electrically connected with the battery 40; the input of the dc/ac converter 32 is electrically connected to the battery 40; the output of the dc/ac converter 32 is electrically connected to a dual power switch 60.
Wherein the AC/DC converter 31 comprises a unidirectional AC/DC converter for converting AC power into DC power; the DC/AC converter 32 includes a unidirectional DC/AC converter for converting DC power to AC power. In an alternative embodiment, the power conversion control system 10 may be electrically or communicatively coupled to the control terminal of the ac/dc converter 31, the control terminal of the dc/ac converter 32.
Illustratively, when the power supply grid is electrified, the power conversion control system 10 controls the ac/dc converter 31 to work, and the ac/dc converter 31 converts the ac power of the ac bus 01 into dc power and then transmits the dc power to the power conversion battery 40 to charge the power conversion battery 40; when the power supply grid is powered off, the power conversion control system 10 controls the ac/dc converter 31 to be quickly switched to the off-grid mode, controls the dc/ac converter 32 to work, and the dc/ac converter 32 converts the dc power of the power conversion battery 40 into ac power to supply power to the power conversion robot 20 through the dual power switch 60.
When the power supply grid is powered off, the dual power switch 60, the AC/DC converter 31 and the DC/AC converter 32 are fast in response and are matched with each other, so that the power supply of the power exchange robot 20 is uninterrupted, and even if the power supply grid is powered off, the power exchange station can still ensure the replacement of the power-deficient battery of the new energy automobile, and the reliability of the power exchange station is improved.
In an alternative embodiment, the inverter further includes a direct current converter (not shown in the figure), such as a unidirectional DC/DC converter and a bidirectional DC/DC converter, so that on one hand, the compatibility of the inverter to different voltages can be improved, and on the other hand, the different unidirectional DC/DC converters and the bidirectional DC/DC converter have different working powers, so that the charging power and the discharging power of the battery 40 can be different, so as to realize charging with greater efficiency and discharging with greater efficiency, reduce energy loss, improve charging rate, and be beneficial to guaranteeing uninterrupted operation of the robot during power outage of the power supply grid.
Optionally, fig. 7 is a schematic structural diagram of another power exchange station according to an embodiment of the present invention. Referring to fig. 7, the inverter 30 includes a charging device 33 and a direct/alternating current converter 32; the input end of the charging device 33 is electrically connected with the alternating current bus 01; the output end of the charging device 33 is electrically connected with the battery 40; the input of the dc/ac converter 32 is electrically connected to the battery 40; the output of the dc/ac converter 32 is electrically connected to a dual power switch 60.
The charging device 33 includes a charging pile or the like, and may convert ac power into dc power. The charging device 33 is used for charging the battery 40 or the battery with insufficient power in the new energy automobile; the battery 40 is used to replace the power shortage battery in the new energy vehicle. The DC/AC converter 32 includes a unidirectional DC/AC converter for converting DC power to AC power.
Specifically, the dc/ac converter 32 and the charging device 33 may form a basic structure of the inverter 30, and the power conversion control system 10 may control the dc/ac converter 32 to operate and take power from the power conversion battery 40 when the power supply grid is powered off. By providing the dc/ac converter 32 in the inverter 30, power can be taken from the battery 40 when the power supply network is disconnected, so that the battery 40 can supply power to the robot 40; meanwhile, the charging equipment 33 is arranged in the inverter 30, so that the quick charging of the battery 40 can be realized when a power supply grid is electrified, the charging equipment 33 can directly charge the battery 40 and also charge the battery with insufficient power in a new energy automobile, the charging in various modes can be realized, the structure of the inverter 30 can be simplified, the utilization rate of the inverter 30 can be improved, and the compatibility and the flexibility of the battery replacement station can be improved.
In an alternative embodiment, a low-power dc/ac converter 32 matched with the power of the battery 40 may be used, where the battery 40 is in communication with the battery 40 through a communication interface and a communication terminal, and when the power supply network is powered off, the battery 40 is controlled by the battery 10 to discharge, and the battery 40 is discharged in a protective manner through the dc/ac converter 32, so that uninterrupted power supply of the battery 40 is ensured on the premise of ensuring safe operation of the battery 40. The low-power unidirectional DC/AC converter 32 and the battery 40 of the battery replacement station are multiplexed into a discharging power supply when the power supply grid is powered off, and an energy storage battery is not required to be additionally arranged, so that the equipment cost can be reduced.
Based on the same inventive concept, the embodiment of the invention provides a power supply method of a power exchange station, which is applied to the power exchange station of any embodiment of the invention, and fig. 8 is a flow chart diagram of an uninterruptible power supply method of the power exchange station provided by the embodiment of the invention. Referring to fig. 8, the uninterruptible power supply method includes:
s101, acquiring state information of a power supply grid.
S102, judging whether the power supply grid is interrupted or not according to the state information. If yes, S103 is executed.
And S103, disconnecting the alternating current bus from the power supply grid, and controlling the inverter to take power from the power exchange battery, wherein the power exchange battery supplies power to the power exchange robot.
The power conversion control system can monitor the state of the power supply grid in real time, when the power supply grid is electrified, the power supply grid can supply power to the power conversion robot, and the power conversion control system can control the inverter to convert alternating current of the alternating current bus into direct current and transmit the direct current to the power conversion battery to charge the power conversion battery; when the power supply grid is powered off, the power conversion control system can also control the grid-connected switch to be disconnected, so that the connection between the alternating current bus and the power supply grid is disconnected, meanwhile, the inverter is controlled to take power from the power conversion battery, direct current of the power conversion battery is converted into alternating current and is transmitted to the power conversion robot through the alternating current bus, the power conversion battery is used for supplying power to the power conversion robot, and the power conversion battery is used for supplying power to the power conversion robot.
According to the embodiment of the invention, the connection between the power supply grid and the alternating current bus can be disconnected by monitoring the state of the power supply grid and disconnecting the grid-connected switch when the power supply grid is powered off, so that the power consumption of the power supply battery by other equipment of the power supply grid is avoided, and the energy consumption of the power conversion battery can be reduced; when the power supply grid is powered off, the inverter is controlled to take electricity from the electricity changing battery, the electricity changing battery can be utilized to supply power to the electricity changing robot, and the power supply to the electricity changing robot is realized, so that the normal operation of the electricity changing robot can be maintained when the power supply grid is powered off, the electricity changing process of a new energy automobile in electricity changing can be ensured, and the hardware cost and the maintenance cost of the electricity changing station are reduced.
In an alternative embodiment, the inverter further comprises an energy storage converter; the power conversion control system is connected with the control end of the energy storage converter. The control inverter gets electricity from trading the electric battery, for trading electric robot power supply, include: and controlling the energy storage converter to take electricity from the electricity changing battery so that the electricity changing battery supplies power for the electricity changing robot.
For example, when the power supply grid is electrified, the power conversion control system can control the energy storage converter to charge the power conversion battery; when the power supply grid is powered off, the power conversion control system can control the energy storage converter to communicate with the power conversion battery through the communication interface, acquire state information of the battery pack power conversion battery, and perform protective discharge on the power conversion battery, so that the power conversion battery reversely supplies power to the power conversion robot, and normal operation of the power conversion robot is ensured.
Optionally, the power exchange station further comprises a dual power switch; the power conversion control system and the motor conversion robot are electrically connected with the alternating current bus through a dual power switch; the power conversion control system and the power conversion robot are also electrically connected with the inverter through a double power switch. Fig. 9 is a schematic flow chart of a method for uninterruptible power supply of another power exchange station according to an embodiment of the present invention. Referring to fig. 9, the uninterruptible power supply method includes:
s201, acquiring state information of a power supply grid.
S202, judging whether the power supply grid is interrupted or not according to the state information. If yes, S203 is executed.
And S203, controlling the inverter to take electricity from the battery replacement, and controlling the dual-power switch to connect the inverter with the battery replacement control system and the battery replacement robot, wherein the battery replacement battery supplies power to the battery replacement robot.
When the power supply grid is electrified, the power conversion control system can output a control signal to the double-power switch to conduct the alternating current bus, the power conversion control system and the power conversion robot, and the power supply grid is adopted to supply power to the power conversion robot; when the power supply grid is powered off, the power conversion control system can output a control signal to the dual-power switch, so that the inverter, the power conversion control system and the power conversion robot are quickly conducted, and the power conversion battery is used for supplying power to the power conversion robot. Therefore, the phenomenon of short circuit or overload of the power supply can be avoided, the power supply is damaged, and the reliability of the power exchange station is improved.
Optionally, the inverter includes an ac/dc converter and a dc/ac converter; the input end of the AC/DC converter is electrically connected with the AC bus; the output end of the AC/DC converter is electrically connected with the battery; the input end of the direct current/alternating current converter is electrically connected with the battery; the output end of the DC/AC converter is electrically connected with the dual power switch. Fig. 10 is a schematic flow chart of a method for uninterruptible power supply of another power exchange station according to an embodiment of the present invention. Referring to fig. 10, the uninterruptible power supply method includes:
s301, acquiring state information of a power supply grid.
S302, judging whether the power supply grid is interrupted or not according to the state information. If yes, S303 is executed.
S303, controlling the AC/DC converter to stop working, controlling the DC/AC converter to work, and controlling the dual power switch to connect the inverter with the power conversion control system and the power conversion robot, wherein the power conversion battery supplies power to the power conversion robot.
For example, when the power supply grid is powered off, the ac/dc converter is controlled to quickly convert to off-grid mode, and the ac/dc converter stops converting the ac power to dc power; and controlling the direct current/alternating current converter to be started quickly, converting the direct current electric energy of the battery to alternating current electric energy, and supplying power to the battery-changing robot through the double power switch. When the power supply grid is powered off, the power supply of the power exchange robot is uninterrupted, and even if the power supply grid is powered off, the power exchange station can still realize the replacement of the power-deficient battery of the new energy automobile, so that the reliability of the power exchange station is improved.
The uninterrupted power supply method of the power exchange station provided by the embodiment of the invention is applied to the power exchange station provided by any embodiment of the invention, has the corresponding technical characteristics and beneficial effects of the power exchange station, and is not described in detail in the embodiment of the uninterrupted power supply method of the power exchange station, and reference can be made to the description of the power exchange station, so that the description is not repeated; likewise, the power exchange station in the embodiment of the present invention also has a functional module and beneficial effects that can execute the uninterruptible power supply method of the power exchange station provided in the embodiment of the present invention, and details that are not described in detail in the embodiment of the power exchange station may refer to the description of the uninterruptible power supply method of the power exchange station above, which is not repeated here.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (6)
1. A power exchange station, comprising: an alternating current bus, a power conversion control system, a power conversion robot, an inverter, a power conversion battery and a dual power switch;
the power conversion control system and the power conversion robot are electrically connected with the alternating current bus through the dual power switch; the power conversion control system and the power conversion robot are also electrically connected with the inverter through the dual power switch;
the power conversion battery is electrically connected with the alternating current bus through the inverter; the alternating current bus is electrically connected with a power supply grid of the power exchange station, and a grid-connected switch is arranged between the alternating current bus and the power supply grid;
when the power supply grid is powered off, the grid-connected switch is turned off, the dual-power switch is connected with the inverter, the power conversion control system and the power conversion robot, and the inverter takes power from the power conversion battery to realize that the power conversion battery supplies power for the power conversion robot;
the inverter comprises an AC/DC converter, a DC/AC converter and a DC converter;
the input end of the alternating current/direct current converter is electrically connected with the alternating current bus; the output end of the alternating current/direct current converter is electrically connected with the battery; the input end of the direct current/alternating current converter is electrically connected with the battery; the output end of the direct-current/alternating-current converter is electrically connected with the dual-power switch; one end of the direct current converter is electrically connected with the battery, and the other end of the direct current converter is electrically connected with the output end of the alternating current/direct current converter and the input end of the direct current/alternating current converter respectively;
when the power supply grid is powered off, the AC/DC converter stops working, the DC/AC converter works, and the battery of the power conversion discharges;
wherein the direct current converter comprises a unidirectional DC/DC converter and a bidirectional DC/DC converter which are connected in parallel; the unidirectional DC/DC converter and the bidirectional DC/DC converter are different in power.
2. The power exchange station of claim 1, further comprising: a UPS power supply;
the power conversion control system is electrically connected with the alternating current bus through the UPS.
3. The power exchange station of claim 1, wherein the inverter comprises a charging device and a dc/ac converter;
the input end of the charging equipment is electrically connected with the alternating current bus; the output end of the charging equipment is electrically connected with the battery; the input end of the direct current/alternating current converter is electrically connected with the battery; the output end of the direct-current/alternating-current converter is electrically connected with the dual-power switch;
when the power supply grid is powered off, the charging equipment stops working, the direct/alternating current converter works, and the battery for replacing electricity discharges.
4. The power plant according to claim 1, characterized in that the double power switch comprises an STS static transfer switch;
a first input end of the STS static change-over switch is electrically connected with the alternating current bus; a second input end of the STS static change-over switch is electrically connected with the inverter; and the output end of the STS static change-over switch is electrically connected with the electric change-over control system and the electric change-over robot.
5. The power exchange station of claim 1, wherein the inverter comprises an energy storage converter;
and when the power supply grid is powered off, the energy storage converter discharges the battery.
6. A method of uninterruptible power supply of a power exchange station, characterized by being applied to a power exchange station as claimed in any one of claims 1-5;
the uninterrupted power supply method of the power exchange station comprises the following steps:
acquiring state information of the power supply grid;
judging whether the power supply of the power supply grid is interrupted or not according to the state information;
if yes, the connection between the alternating current bus and the power supply grid is disconnected, the alternating current/direct current converter is controlled to stop working, the direct current/alternating current converter is controlled to work, electricity is taken from the electricity changing battery, the double-power switch is also controlled to connect the inverter with the electricity changing control system and the electricity changing robot, and the electricity changing battery supplies power for the electricity changing robot.
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| CN103730952A (en) * | 2014-01-26 | 2014-04-16 | 国家电网公司 | Emergency power supply device and method for electric vehicle swapping station |
| CN111873844A (en) * | 2020-07-15 | 2020-11-03 | 浙江吉智新能源汽车科技有限公司 | Network topology structure of battery swapping station, battery swapping method of electric vehicle and battery swapping station |
| CN111969708A (en) * | 2020-07-20 | 2020-11-20 | 浙江吉智新能源汽车科技有限公司 | Battery replacement station protection system and protection method |
| WO2023025040A1 (en) * | 2021-08-24 | 2023-03-02 | 中国华能集团清洁能源技术研究院有限公司 | Battery swapping station |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730952A (en) * | 2014-01-26 | 2014-04-16 | 国家电网公司 | Emergency power supply device and method for electric vehicle swapping station |
| CN111873844A (en) * | 2020-07-15 | 2020-11-03 | 浙江吉智新能源汽车科技有限公司 | Network topology structure of battery swapping station, battery swapping method of electric vehicle and battery swapping station |
| CN111969708A (en) * | 2020-07-20 | 2020-11-20 | 浙江吉智新能源汽车科技有限公司 | Battery replacement station protection system and protection method |
| WO2023025040A1 (en) * | 2021-08-24 | 2023-03-02 | 中国华能集团清洁能源技术研究院有限公司 | Battery swapping station |
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