CN114744692A - Charging system and charging method thereof - Google Patents

Charging system and charging method thereof Download PDF

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Publication number
CN114744692A
CN114744692A CN202111184783.XA CN202111184783A CN114744692A CN 114744692 A CN114744692 A CN 114744692A CN 202111184783 A CN202111184783 A CN 202111184783A CN 114744692 A CN114744692 A CN 114744692A
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China
Prior art keywords
power supply
power
charging
target
charging pile
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Pending
Application number
CN202111184783.XA
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Chinese (zh)
Inventor
孙国杰
冯涛
张仲华
张一�
齐贺
周小力
袁媛
魏俊
刘章
程立
陆韬
袁名鑫
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Shenzhen International Graduate School of Tsinghua University
China Construction Science and Technology Group Co Ltd
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Shenzhen International Graduate School of Tsinghua University
China Construction Science and Technology Group Co Ltd
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Priority to CN202111184783.XA priority Critical patent/CN114744692A/en
Publication of CN114744692A publication Critical patent/CN114744692A/en
Pending legal-status Critical Current

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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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention is suitable for the technical field of electric power, and provides a charging system and a charging method thereof, wherein the charging system comprises a power supply device and a charging device, the power supply device comprises a plurality of power supplies, the charging device at least comprises a charging pile, the power supplies are all connected with the charging pile, and the charging method comprises the following steps: when a target charging pile in the charging device detects an insertion operation, the required power of electric equipment connected with the target charging pile is acquired and sent to the power supply device, the power supply device acquires the current working state and the current output power of each power supply, and under the condition that the current working state and the current output power of each power supply meet the conditions, the target power supply is determined according to a preset power supply strategy and supplies power to the target charging pile. The power supply device and the charging device in the charging system provided by the embodiment of the invention are connected by wires, the connecting wires are multiplexed for information interaction, the communication stability is improved, and meanwhile, the corresponding power supply source is matched according to the required power of the charging pile, so that the power utilization impact caused by large-scale access is reduced.

Description

Charging system and charging method thereof
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to a charging system and a charging method thereof.
Background
Photovoltaic power generation is direct current and can be connected to a power grid only through alternating current-direct current conversion. In addition, due to the influence of weather, the randomness of photovoltaic power generation can cause huge discharge impact of a power grid. The existing charging pile system mostly adopts an AC/DC three-level technology to realize alternating current and direct current conversion, and converts the alternating current of a power grid into direct current to supply an electric automobile for charging, so that huge power consumption impact can be brought to the power grid by the access of a large-scale electric automobile.
The charging pile system mainly adopts wireless communication or is additionally provided with an additional wired communication line to realize direct networking communication of each charging pile, the cost is increased by the methods, and the wireless communication has the problem of instability, so that the popularization and the use of the charging pile system are not facilitated.
Disclosure of Invention
The invention aims to provide a charging system and a charging method thereof, and aims to solve the problems that the existing charging system is unstable in communication connection and huge power utilization impact can be brought to a power grid when a large-scale electric vehicle is accessed.
The embodiment of the invention is realized in such a way that a charging method of a charging system comprises a power supply device and a charging device, wherein the power supply device comprises a plurality of power supply sources, the charging device comprises at least one charging pile, the power supply sources are all in wired connection with the at least one charging pile, and the charging method comprises the following steps:
when the target charging pile of the charging device detects the insertion operation, acquiring the required power of electric equipment connected with the target charging pile, and sending the required power to the power supply device;
the power supply device acquires the current working state of each power supply, and acquires the current output power of the power supply meeting power supply conditions when the current working state of the power supply meets the power supply conditions;
and the power supply device determines a target power supply according to a preset power supply strategy under the condition that the current output power of the power supply meets the required power, and controls the target power supply to supply power to the target charging pile.
Further, the target charging pile sends the required power to the power supply device through a power line.
Further, the acquiring, by the power supply apparatus, a current operating state of each of the power supplies, and when it is determined that the current operating state of the power supply satisfies a power supply condition, acquiring current output power of the power supply satisfying the power supply condition includes:
the power supply device acquires the current working state of each power supply;
judging whether the current working state of the power supply is an electric energy output state or not;
if not, determining that the power supply does not meet the power supply requirement;
and if so, determining that the power supply meets the power supply condition and acquiring the current output power of the power supply.
Further, the target charging pile transmitting the required power to the power supply device through a power line includes:
the target charging pile sends the required power to each power supply in the power supply device through the power line;
the obtaining, by the power supply device, the current operating state of each of the power supplies includes:
and after receiving the required power, each power supply sends the current working state and the current output power of the power supply to the power supply device.
Further, power supply unit includes electric supply system, photovoltaic system and energy storage system, electric supply system is set up as master control system, the target fills electric pile with required power sends to power supply unit's step includes:
and the target charging pile sends the required power to the master control system through a power line.
Further, the acquiring, by the power supply apparatus, a current operating state of each of the power supplies, and when it is determined that the current operating state of the power supply satisfies a power supply condition, acquiring current output power of the power supply satisfying the power supply condition includes:
the master control system acquires the current working state and the current output power of the master control system;
the master control system respectively sends feedback instructions to the photovoltaic system and the energy storage system through the power line;
after receiving the feedback instruction, the photovoltaic system and the energy storage system acquire the current working state and the current output power of the photovoltaic system and the energy storage system and send the current working state and the current output power to the master control system;
the master control system judges whether the current working state is an electric energy output state;
if not, determining that the current working state does not meet the power supply requirement;
and if so, determining that the current working state meets the power supply condition and acquiring the corresponding current output power.
Further, the power supply device determines a target power supply according to a preset power supply strategy, and the step of controlling the target power supply to supply power to the target charging pile comprises:
a first preset power supply is used as the first target power supply, and the first target power supply is controlled to supply power to the target charging pile;
when the first preset power supply cannot meet the required power of the target charging pile, starting a second preset power supply, and taking the first preset power supply and the second preset power supply together as a second target power supply to supply power to the target charging pile;
and when the second target power supply cannot meet the required power of the target charging pile, starting a third preset power supply, and supplying power to the charging pile by taking the third preset power supply and the second target power supply as the third target power supply.
Further, the charging method further includes:
when the current output power of the first preset power supply meets the required power of the target charging pile, controlling the first preset power supply to charge the second preset power supply;
acquiring current time information and the residual electric quantity of the second preset power supply;
when the residual capacity of the second preset power supply meets the charging condition, judging whether the current time information meets the time condition for charging the second preset power supply;
and if so, controlling the third preset power supply to charge the second preset power supply.
The embodiment of the invention also provides a charging system, which comprises a power supply device and a charging device, wherein the power supply device comprises a plurality of power supply sources, the charging device comprises at least one charging pile, the power supply sources are all in wired connection with the at least one charging pile, and the charging system comprises:
the target charging pile of the charging device is used for acquiring the required power of the electric equipment connected with the target charging pile and sending the required power to the power supply device when the inserting operation is detected;
the power supply device is used for acquiring the current working state of each power supply and acquiring the current output power of the power supply meeting the power supply condition when the current working state of the power supply meets the power supply condition;
the power supply device is further configured to determine a target power supply according to a preset power supply strategy and control the target power supply to supply power to the target charging pile under the condition that it is determined that the current output power of the power supply meets the required power.
Furthermore, the power supply device also comprises a plurality of first power carrier autonomous group control modules and a plurality of conversion modules, wherein the power supply, the first power carrier autonomous group control modules and the conversion modules are in one-to-one correspondence, and the first power carrier autonomous group control modules are communicated with one another;
the charging device comprises at least one second power carrier autonomous group control module, the charging pile corresponds to the second power carrier autonomous group control modules one by one, and the second power carrier autonomous group control modules are communicated with each other;
the power supply, the conversion module and the first power carrier autonomous group control module are sequentially connected, and the first power carrier autonomous group control module is connected with a power line;
the second power carrier autonomous group control module is respectively connected with the power line and the charging pile.
Compared with the prior art, the invention has the beneficial effects that: the charging system provided by the embodiment of the invention comprises a power supply device and a charging device, wherein the power supply device comprises a plurality of power supply sources, the charging device at least comprises a charging pile, all the power supply sources are connected with the charging pile, when the target charging pile in the charging device detects the insertion operation, the required power of electric equipment connected with the target charging pile is obtained, the required power is sent to the power supply device, the power supply device obtains the current working state and the current output power of each power supply source, and when the current working state and the current output power of each power supply source meet the conditions, the target power supply source is determined according to a preset power supply strategy, and the target power supply source is controlled to supply power to the target charging pile. The power supply device and the charging device in the charging system provided by the embodiment of the invention are connected by wires, the connecting wires are multiplexed for information interaction, the communication stability is improved, and meanwhile, the corresponding power supply source is matched according to the required power of the charging pile, so that the power utilization impact caused by large-scale access is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a charging method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a charging method according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a charging method according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 shows a charging system according to an embodiment of the present invention, which includes a power supply device 100 and a charging device 200, where the power supply device 100 includes a plurality of power supplies 101, the charging device 200 includes at least one charging pile 201, all the power supplies 101 are connected to the charging pile by wires, specifically, all the power supplies 101 are connected to a power line 300, and all the charging piles are also connected to the power line 300, because the power supplies and the charging piles are connected to the power line 300, and the power line can be multiplexed, that is, the power line 300 can perform carrier communication, so that the power supplies, the charging piles, the power supplies and the charging piles can all communicate with each other, that is, the power supplies and the charging piles realize networking communication by accessing the power line.
Specifically, as shown in fig. 2, the power supply apparatus 100 includes a photovoltaic system 101, a utility power system 102, and an energy storage system 103, the photovoltaic system 101 includes a photovoltaic power supply 1011, a first conversion module 1012, and a power carrier autonomous group control module 1013, the photovoltaic power supply 1011, the first conversion module 1012, and the power carrier autonomous group control module 1013 are connected in sequence, and are connected to the power line 300 through the power carrier autonomous group control module 1013, the first conversion module 1012 is a DC/DC (direct current-direct current) conversion module; the utility power system 102 includes a utility power supply 1021, a second conversion module 1022 and a power carrier autonomous group control module 1023, wherein the utility power supply 1021, the second conversion module 1022 and the power carrier autonomous group control module 1023 are sequentially connected and are connected to the power line 300 through the power carrier autonomous group control module 1023, and the second conversion module 1022 is an AC/DC (alternating current-direct current) conversion module; the energy storage system 103 includes an energy storage power supply 1031, a third conversion module 1032 and a power carrier autonomous group control module 1033, the energy storage power supply 1031, the third conversion module 1032 and the power carrier autonomous group control module 1033 are sequentially connected, the power line 300 is accessed through the power carrier autonomous group control module 1033, the energy storage power supply includes a plurality of energy storage batteries, the plurality of energy storage batteries output electric energy to the third conversion module 1032 in a parallel or serial manner, and the third conversion module 1032 is a DC/DC (direct current-direct current) conversion module. The first conversion module 1013 and the third conversion module 1032 are DC/DC bidirectional conversion modules.
The charging device 200 comprises a plurality of charging piles 201 and a plurality of power carrier autonomous group control modules 202, wherein the charging piles 201 correspond to the power carrier autonomous group control modules 202 one by one, that is, one charging pile 201 is connected with one power carrier autonomous group control module 202, and is connected with a power line 300 through the power carrier autonomous group control module 202. All the charging piles in the charging device 200 are direct current charging piles.
In this embodiment, the power line 300 is also referred to as a dc charging bus, the power device 100 and the charging device 200 are both connected to the dc charging bus, and all the power supplies of the power device 100 output the dc charging bus with dc current, that is, in fig. 2, no matter the photovoltaic power 1011, the energy storage 1031 or the utility 1021, the power output to the power line 300 after passing through the conversion module and the power carrier autonomous group control module is dc current. The power carrier autonomous group control module is also referred to as a power carrier autonomous group control node in this embodiment.
Fig. 3 illustrates a specific implementation manner of the charging system according to an embodiment of the present invention, where the power carrier autonomous group control module in fig. 2 is referred to as a power carrier autonomous group control node in this embodiment.
The charging method of the charging system provided by the embodiment of the invention comprises the following steps:
s401, when the target charging pile of the charging device detects an insertion operation, acquiring the required power of electric equipment connected with the target charging pile, and sending the required power to the power supply device.
In this step, when the charging device 200 detects that there is an insertion operation, it determines the target charging pile of the insertion operation, that is, it is determined which charging pile is inserted first by the charging device 200, and the charging pile is used as the target charging pile, and obtains the required power of the electric device connected to the target charging pile, and sends the required power to the power supply device 100. It should be noted that, in practical applications, when any charging pile 201 in the charging apparatus 200 is inserted into an electric device, the inserted charging pile 201 immediately acquires the required power of the electric device connected thereto, the required power of the electric device may be acquired by the charging pile sending handshake information and reading information to the electric device, and after completing communication connection with the electric device, the electric device feeds back the current required power, in another acquisition mode, the inserted charging pile 201 receives the required power input by an input system, and the required power is used as the required power of the electric device, and the input system may be an APP (application program) or an input device carried by the charging pile 201.
In this step, the charging device 200 sends the required power to the power supply device 100 through the power line 300, and in practical application, the power supply device 100 may additionally be provided with a main control system, and the control system is respectively connected to the photovoltaic system, the utility power system, and the energy storage system, or may set one of the photovoltaic system, the utility power system, and the energy storage system as the main control system. Therefore, in this step, the charging device 200 sends the required power to the main control system in the power device 100 through the power line 300, or the charging device 200 sends the required power to each power supply in the power device through the power line 300.
S402, the power supply device obtains the current working state of each power supply, and obtains the current output power of the power supply meeting the power supply condition when the current working state of the power supply meets the power supply condition.
In this step, two implementation manners are included, wherein:
in a first implementation manner, a main control system additionally arranged in the power supply device acquires the current working state of each power supply, wherein each power supply comprises a photovoltaic power supply, a commercial power supply and an energy storage power supply; judging whether the current working state of the power supply is an electric energy output state or not; if not, determining that the power supply does not meet the power supply requirement; and if so, determining that the power supply meets the power supply condition and acquiring the current output power of the power supply. Specifically, if the charging pile sends the required power to each power supply in the power supply device through the power line 300, each power supply sends its current working state and current output power to a main control system additionally disposed in the power supply device after receiving the required power, and the main control system performs subsequent determination or confirmation steps according to the received information.
In a second implementation manner, the utility power system is set as a master control system, the target charging pile sends the required power to the master control system (i.e. utility power system) through a power line 300, and the master control system obtains its current working state and current output power; the master control system respectively sends feedback instructions to the photovoltaic system and the energy storage system through the power line; after receiving the feedback instruction, the photovoltaic system and the energy storage system acquire the current working state and the current output power of the photovoltaic system and the energy storage system and send the current working state and the current output power to the master control system; the master control system judges whether the current working state is an electric energy output state; if not, determining that the current working state does not meet the power supply requirement; and if so, determining that the current working state meets the power supply condition and acquiring the corresponding current output power.
And S403, under the condition that the current output power of the power supply meets the required power, the power supply device determines a target power supply according to a preset power supply strategy and controls the target power supply to supply power to the target charging pile.
In this step, when it is determined that the power supplies satisfy all the output conditions, the power supply device 100 determines a target power supply according to a preset power supply policy, and controls the target power supply to supply power to the target charging pile. It should be noted that, if the power supply apparatus 100 determines that only one power supply satisfies all the determination and determination conditions, the target power supply may be determined without according to the preset power supply policy, and if more than two power supplies satisfy all the determination and determination steps, the target power supply needs to be determined according to the preset power supply policy, in this step, it is further described that all the power supplies in fig. 2 or fig. 3 satisfy the conditions:
in this embodiment, the power supply device 100 uses a first preset power supply as the first target power supply, and controls the first target power supply to supply power to the target charging pile; and when the first preset power supply cannot meet the required power of the target charging pile, controlling the first preset power supply to stop outputting, and using the second preset power supply as a second target power supply to supply power to the target charging pile. Specifically, the first preset power supply is a photovoltaic power supply, and the second preset power supply is a mains supply. Further, when the first preset power supply cannot meet the required power of the target charging pile, current time information is obtained; judging whether the current time information meets the time condition for starting the second preset power supply or not; if yes, controlling the first preset power supply to stop outputting, and using the second preset power supply as a second target power supply to supply power to the target charging pile; if the charging position does not meet the charging position, a third preset power supply is started, and the third preset power supply and the first preset power supply are controlled to supply power to the target charging pile together. Specifically, this third default power supply is energy storage power supply, and in this step, in order to realize the crest power consumption of wave trough, consequently when launching mains supply and supplying power, need confirm current time information, confirm promptly that the present is crest power consumption or trough power consumption, if the crest power consumption, then do not use mains supply as target power supply and supply power to filling the electric pile, will launch the mode of energy storage power supply and the common power supply of photovoltaic power supply at this moment and supply power to filling the electric pile. And when the trough power utilization, will stop to use energy storage power supply to use commercial power supply to charge to the energy storage battery in the energy storage power supply when filling electric pile power supply. Because the photovoltaic power supply can hardly generate electricity when the trough of the power is used, the power supply energy of the photovoltaic power supply can be almost ignored at the moment. It should be noted that when the photovoltaic power supply supplies power to meet the power demand of the charging pile, the redundant power is charged to the energy storage power supply through the power line 300, the mode of charging the energy storage power supply by receiving the power of the photovoltaic power supply is the same as that in the prior art, namely after the current transmitted by the photovoltaic power supply through the power line 300 is subjected to DC/DC conversion, the energy storage battery is charged after the current meeting the charging requirement is obtained.
In another embodiment, the mains system is used as the main control system for further explanation:
a first preset power supply is used as the first target power supply, and power is supplied to the target charging pile through the first target power supply; when the first preset power supply cannot meet the required power of the target charging pile, starting a second preset power supply, and controlling the first preset power supply and the second preset power supply to serve as a second target power supply together to supply power to the target charging pile; and when the second target power supply cannot meet the required power of the target charging pile, starting a third preset power supply, and using the third preset power supply and the second target power supply together as the third target power supply to supply power to the charging pile. Specifically, in this step, the first preset power source is a photovoltaic system, the second preset power source is an energy storage system, and the third preset power source is a power system, in this embodiment, the electric energy obtained by performing photoelectric conversion on the photovoltaic system is preferentially consumed as much as possible, so that the electric energy generated by the photovoltaic system is used as the power for the target charging pile under the condition of sufficient sunlight, and when the electric energy generated by the photovoltaic system cannot meet the power supply requirement of the target charging pile, the energy storage system is started to supply power to the target charging pile together. When the photovoltaic system and the energy storage system supply power to the target charging pile together and the charging requirement of the target charging pile cannot be met, the commercial power system is started to supply power to the target charging pile together, namely, three power supply modes exist in the trial test, including independent power supply of the photovoltaic system, power supply of the photovoltaic system and the energy storage system together, and power supply of the photovoltaic system and the energy storage system and the commercial power system together. It should be noted that, when the photovoltaic system and the energy storage system supply power to the target charging pile together or separately, the utility power system serves as a master control system, and sends a detection signal to the dc charging bus, and the detection signal is sent to each charging pile in the photovoltaic system, the energy storage system and the charging device through the dc charging bus, so as to take corresponding measures in accordance with the conditions of other components in the charging system. Furthermore, in order to further utilize the electric energy generated by the photovoltaic system and save cost, the utility power system controls the first preset power supply to charge the second preset power supply when the current output power of the first preset power supply meets the required power of the target charging pile. When the photovoltaic system stops working at night and no electric energy is generated, the commercial power system acquires current time information and the residual electric quantity of the second preset power supply; when the residual capacity of the second preset power supply meets the charging condition, judging whether the current time information meets the time condition for charging the second preset power supply; and if so, controlling the third preset power supply to charge the second preset power supply. In this implementation, this utility power system judges the crest trough time information for the power consumption according to this current time information, and when the crest, utility power system is set up to reduce the cost, can not charge to energy storage system, and when the trough, this utility power system will charge each energy storage battery in the energy storage system according to energy storage system's residual capacity to satisfy the power consumption demand of next day.
The charging pile on the market at present mostly adopts an AC/DC three-level technology to realize bidirectional conversion of alternating current and direct current, and a DC/DC conversion module (comprising a first conversion module and a third conversion module) in the embodiment of the invention adopts a high-frequency isolation bidirectional conversion technology, namely a soft switch resonance technology, so that a power frequency transformer is omitted, the efficiency is high, the energy of the converter can flow bidirectionally, and charging and discharging are automatically switched. The DC/DC conversion module can enable new energy systems such as photovoltaic power generation and the like to be seamlessly switched with a mains supply system, and has positive significance for photovoltaic consumption and carbon neutralization. In another aspect, wireless communication is mostly adopted or extra wired communication lines are additionally arranged in the existing charging pile system to realize direct networking communication of each charging pile, the cost is increased by the methods, and the problem of instability of the wireless communication exists, so that the popularization and the use of the charging pile system are not facilitated. According to the embodiment of the invention, high-frequency signals are superposed on a direct-current 750V power line, a 2 MHz-20 MHz narrowband data Physical layer link is established in the high-voltage direct-current power line, a PHY layer (Physical layer, namely a port Physical layer, is positioned at the bottommost layer of an OSI (open system interconnection) is provided for the autonomous group Control of the flexible charging pile, and a port Physical layer protocol defines a connector for electric signals, line states, clock requirements, data coding and data transmission.
According to the charging system provided by the embodiment of the invention, the DC/DC bidirectional conversion module is used as the power conversion module of the charging pile, one charging system can be smoothly connected with the clean energy power generation system in a direct current mode, and the energy loss caused by DC/AC and AC/DC conversion of the traditional photovoltaic charging station is omitted. The DC/DC bidirectional conversion module can realize bidirectional flow of energy of the automobile battery, and provides a feasible scheme for complete consumption of photovoltaic power generation and flexible control of a power distribution system.
Based on the solution of networking communication of the charging pile system, the embodiment of the invention provides a communication mode of a power carrier ad hoc network, so that power distribution of the charging pile and flexible control of the direct-current microgrid are realized. As shown in fig. 3, a commercial power conversion AC/DC module configures a power carrier autonomous group control node a, a photovoltaic conversion DC/DC module configures a power carrier autonomous group control node B, an energy storage battery conversion DC/DC module configures a power carrier autonomous group control node C, and each DC charging pile power conversion DC/DC module configures one power carrier node.
The photovoltaic system, the energy storage system, the commercial power system and the charging piles complete power transmission distribution through a direct current 750VDC power line, and 2 MHz-20 MH high-frequency signals are superposed on the power line in the embodiment of the invention, so that data interaction between each charging pile and the power distribution module is realized. The power carrier autonomous group control nodes 1-n belong to a peer-to-peer network.
In order to ensure the voltage stability of the direct current charging bus and reduce the system power oscillation, a mains supply system on the side of the power supply device is used as a master control system, a photovoltaic system is used, and an energy storage system is used as the third system. The DC charging pile has no main part and auxiliary part. The power carrier autonomous group control nodes A-C and 1-n can receive mutual information, namely the photovoltaic real-time power generation power, the commercial power real-time output power, the charging and discharging state of the energy storage battery, the input and output power, the charging state of the energy storage battery, the output power of the charging pile, the charging state of the electric vehicle and other information are communicated. The power output adjustment strategy on the power supply device side is as follows: photovoltaic power generation is absorbed to the maximum extent; the energy storage battery is used for charging/discharging adjustment, and the power output of the commercial power meets the peak clipping and valley filling targets of the power grid. The power distribution principle of each charging pile at the charging device side is as follows: the fluctuation curve of the power sum of the source sides is met, the charging power of each pile is flexibly distributed, and large power oscillation of the system is not caused.
In other use processes, the direct current charging pile further comprises a charging power conversion DC/DC module, the charging power conversion DC/DC module is in a bidirectional mode, and on the premise that a protocol is opened, according to the actual charging time requirement, the electric automobile can replace part or all of energy storage batteries, so that power flowing between the V2L charging piles is realized, and the final purpose of fully eliminating photovoltaic and power grid peak clipping and valley filling is achieved.
Through the embodiments, in a first aspect, the DC/DC bidirectional conversion module provided by the embodiments of the present invention is used as a power conversion module of the charging pile, and one charging pile system can be smoothly connected to a clean energy power generation system in a direct current manner, and energy loss caused by DC/AC and AC/DC conversion of a conventional photovoltaic charging station is omitted. The DC/DC bidirectional conversion module can realize bidirectional flow of energy of the automobile battery, and provides a feasible scheme for complete consumption of photovoltaic power generation and flexible control of a power distribution system. In a second aspect, based on a solution of networking communication of a charging pile system, the embodiment of the invention provides a communication mode of a power carrier ad hoc network, so that power distribution of a charging pile and flexible control of a direct-current microgrid are realized.
The embodiment provided by the invention can be suitable for large-scale scenes such as charging piles equipped on photovoltaic charging stations, power utilization of other direct current loads in the stations, charging piles equipped on civil houses and office places, power utilization of other direct current loads in buildings and the like.
In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is only one logical division, and other divisions may be realized in practice, for example, a plurality of modules or components may be combined or integrated into another apparatus, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some interfaces, indirect coupling or communication connection between devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It should be noted that, for the sake of simplicity, the above-mentioned method embodiments are described as a series of acts or combinations, but those skilled in the art should understand that the present invention is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no acts or modules are necessarily required of the invention.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In view of the above description of the charging system and the charging method thereof provided by the present invention, those skilled in the art will recognize that there are variations in the concepts and the embodiments of the present invention.

Claims (10)

1. A charging method of a charging system is characterized in that the charging system comprises a power supply device and a charging device, the power supply device comprises a plurality of power supply sources, the charging device comprises at least one charging pile, the power supply sources are all in wired connection with the at least one charging pile, and the charging method comprises the following steps:
when the target charging pile of the charging device detects the insertion operation, acquiring the required power of electric equipment connected with the target charging pile, and sending the required power to the power supply device;
the power supply device acquires the current working state of each power supply, and acquires the current output power of the power supply meeting power supply conditions when the current working state of the power supply meets the power supply conditions;
and the power supply device determines a target power supply according to a preset power supply strategy under the condition that the current output power of the power supply meets the required power, and controls the target power supply to supply power to the target charging pile.
2. The charging method according to claim 1, wherein the target charging pile transmits the required power to the power supply device through a power line.
3. The charging method according to claim 2, wherein the power supply device acquires a current operating state of each of the power supplies, and acquiring a current output power of the power supply that satisfies a power supply condition when it is determined that the current operating state of the power supply satisfies the power supply condition comprises:
the power supply device acquires the current working state of each power supply;
judging whether the current working state of the power supply is an electric energy output state or not;
if not, determining that the power supply does not meet the power supply requirement;
and if so, determining that the power supply meets the power supply condition and acquiring the current output power of the power supply.
4. The charging method according to claim 3, wherein the target charging pile transmitting the required power to the power supply apparatus through a power line includes:
the target charging pile sends the required power to each power supply in the power supply device through the power line;
the obtaining, by the power supply device, the current operating state of each of the power supplies includes:
and after receiving the required power, each power supply sends the current working state and the current output power of the power supply to the power supply device.
5. The charging method according to claim 1, wherein the power supply device includes a utility power system, a photovoltaic system, and an energy storage system, the utility power system is set as a master control system, and the step of the target charging pile transmitting the required power to the power supply device includes:
and the target charging pile sends the required power to the master control system through a power line.
6. The charging method according to claim 5, wherein the power supply device acquires a current operating state of each of the power supplies, and acquiring a current output power of the power supply that satisfies a power supply condition when it is determined that the current operating state of the power supply satisfies the power supply condition comprises:
the master control system acquires the current working state and the current output power of the master control system;
the master control system respectively sends feedback instructions to the photovoltaic system and the energy storage system through the power line;
after receiving the feedback instruction, the photovoltaic system and the energy storage system acquire the current working state and the current output power of the photovoltaic system and the energy storage system and send the current working state and the current output power to the master control system;
the master control system judges whether the current working state is an electric energy output state;
if not, determining that the current working state does not meet the power supply requirement;
and if so, determining that the current working state meets the power supply condition and acquiring the corresponding current output power.
7. The charging method according to claim 1, wherein the power supply device determines a target power supply according to a preset power supply policy, and the step of controlling the target power supply to supply power to the target charging pile comprises:
a first preset power supply is used as the first target power supply, and power is supplied to the target charging pile through the first target power supply;
when the first preset power supply cannot meet the required power of the target charging pile, starting a second preset power supply, and taking the first preset power supply and the second preset power supply together as a second target power supply to supply power to the target charging pile;
and when the second target power supply cannot meet the required power of the target charging pile, starting a third preset power supply, and using the third preset power supply and the second target power supply together as the third target power supply to supply power to the charging pile.
8. The charging method according to claim 7, further comprising:
when the current output power of the first preset power supply meets the required power of the target charging pile, controlling the first preset power supply to charge the second preset power supply;
acquiring current time information and the residual electric quantity of the second preset power supply;
when the residual electric quantity of the second preset power supply meets the charging condition, judging whether the current time information meets the time condition for charging the second preset power supply;
and if so, controlling the third preset power supply to charge the second preset power supply.
9. The utility model provides a charging system, its characterized in that, charging system includes power supply unit and charging device, power supply unit includes a plurality of power supply, charging device includes at least one and fills electric pile, power supply all with at least one fills electric pile wired connection, wherein:
the target charging pile of the charging device is used for acquiring the required power of the electric equipment connected with the target charging pile and sending the required power to the power supply device when the inserting operation is detected;
the power supply device is used for acquiring the current working state of each power supply and acquiring the current output power of the power supply meeting power supply conditions when the current working state of the power supply meets the power supply conditions;
the power supply device is further configured to determine a target power supply according to a preset power supply strategy and control the target power supply to supply power to the target charging pile under the condition that it is determined that the current output power of the power supply meets the required power.
10. The charging system according to claim 9, wherein the power supply device further includes a plurality of first power carrier autonomous group control modules and a plurality of conversion modules, the power supply, the first power carrier autonomous group control modules and the conversion modules correspond to one another, and each of the first power carrier autonomous group control modules communicates with one another;
the charging device comprises at least one second power carrier autonomous group control module, the charging pile corresponds to the second power carrier autonomous group control modules one by one, and the second power carrier autonomous group control modules are communicated with each other;
the power supply, the conversion module and the first power carrier autonomous group control module are sequentially connected, and the first power carrier autonomous group control module is connected with a power line;
the second power carrier autonomous group control module is respectively connected with the power line and the charging pile.
CN202111184783.XA 2021-10-12 2021-10-12 Charging system and charging method thereof Pending CN114744692A (en)

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Application Number Priority Date Filing Date Title
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