CN117022025B - Charging pile power balance distribution system and method thereof - Google Patents
Charging pile power balance distribution system and method thereof Download PDFInfo
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Classifications
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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
- B60L53/60—Monitoring or controlling charging stations
- B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
-
- 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
- B60L53/10—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 characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
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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
- B60L53/30—Constructional details of charging stations
- B60L53/31—Charging columns specially adapted for electric vehicles
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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
-
- 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
- Y02T90/12—Electric charging stations
Abstract
The application discloses a charging pile power balance distribution system and a charging pile power balance distribution method. The application performs balanced algorithm distribution when the multi-power request module simultaneously provides power requirements, ensures fair and rapid distribution of charging power, maximally utilizes the complete power of the charging pile, and maximally meets the charging power requirements of vehicles.
Description
Technical Field
The application relates to the technical field of power distribution of direct-current high-power charging piles of electric automobiles, in particular to a charging pile power balance distribution system and a method thereof.
Background
The function of the charging pile is similar to that of an oiling machine in a gas station, the charging pile can be fixed on the ground or a wall, and the charging pile is installed in a parking lot or a centralized charging station of a public building and a residential community, so that various types of charging automobiles can be charged according to different voltage levels. The input end of the charging pile is connected with an alternating current power grid, and the output end of the charging pile is provided with a charging plug for charging a charging automobile. The charging pile generally provides two modes of conventional charging and quick charging, and the direct current charging pile and the high-power direct current charging pile belong to quick charging. The direct current charging pile (pile) can output required current and voltage according to BMS requirements of the electric automobile, and can rapidly supplement electricity for the automobile.
Traditional direct current fills electric pile and is single rifle or two rifle, and single rifle output is 60kW ~120kW. With the improvement of the battery voltage level and the increase of the battery electric quantity of the electric automobile, the required highest output power of a single gun can reach more than 200kW, and the charging time of the single car is shortened to be within 0.5 hour, so that a high-power direct-current charging pile is generated. The high-power direct-current charging pile has outstanding advantages in the scenes of centralized power exchange stations, bus charging stations, heavy truck charging stations and the like. The power stack consists of a plurality of charging guns, is conventionally configured into one-to-eight or one-to-twelve, and the highest power which can be output by a single charging gun is 250kW; after the power of a charging gun is reduced, the charging pile can distribute spare power to other charging guns; when a plurality of guns have output requirements at the same time, the charging pile can distribute power according to a strategy, however, the charging strategy of the existing charging pile cannot ensure fair and rapid distribution of charging power.
Disclosure of Invention
In order to solve the problems, the application provides a charging pile power balance distribution system and a method thereof, which can rapidly, reasonably and fairly distribute power in a full-charge system while preferentially meeting the requirements of high-priority vehicles when a plurality of charging guns have output requirements at the same time.
In order to achieve the above object, the present application is realized by the following technical scheme:
the application relates to a power balance distribution system of a charging pile, which comprises the charging pile and a charging pile, wherein the charging pile is connected with a plurality of charging piles through a CAN bus, the charging pile comprises a power management module, a plurality of power modules and a plurality of power distribution units, the power management module is connected with the power modules through a first CAN bus and is connected with the power distribution units through a second CAN bus, and the charging pile comprises a charging service module, a power request module and a charging gun;
the power management module is used for executing an equilibrium distribution edge calculation algorithm to schedule and distribute the direct-current change power of the charging stacks, and is responsible for recovering the distributed surplus power quota released after the power demand is reduced, and each charging stack is configured with one power;
the power module is used for performing power conversion and output operation;
the power distribution unit is used for connecting the charging pile with the power module and distributing power;
the charging service module is used for managing the charging service of the charging gun;
the power request module is used for acquiring the charging requirement of the electric automobile at regular time, judging whether the charging requirement exceeds the current maximum allowable output power of the charging gun, and if so, carrying out charging power request and power confirmation on the power management module of the charging pile;
and the charging gun performs charging output according to the quota.
The application further improves that: the power modules are AC/DC rectifying modules, each charging pile is provided with a plurality of AC/DC rectifying modules, and the output power of each AC/DC rectifying module is 20kW or 30kW.
The application further improves that: the number of the power distribution units of each charging pile is the same as that of the charging piles, and the charging guns of the charging piles perform charging output according to the sum of the power quota of the corresponding power distribution units and the power of the single power module.
The application further improves that: after the power management module obtains the charging power request of the power request module, the power management module calculates the balanced distribution edge according to the available power of the current charging pile and the power application condition of the whole system, dispatches the power module of the charging pile according to the calculation result, and distributes power through the power distribution unit.
The application further improves that: the specific process of calculating the balanced distribution edge is as follows:
a. calculating the request power of each charging pile according to the charging power request sent by each power request module;
b. calculating the power initial weights of all charging piles sending out the charging power request, and adding all obtained power initial weights to obtain a weight sum;
c. setting the number of the allocable power modules as the execution times of power allocation;
d. performing power allocation: the charging pile with the highest weight obtains primary power distribution sequencing, and the power initial weight of the charging pile with the obtained power distribution is subtracted by the weight sum to obtain the current weight of the charging pile; and refreshing the weights of all the charging piles sending the charging power request, and carrying out power distribution again according to the refreshed weights until the current weights of all the charging piles are 0, thereby obtaining the final power distribution sequence.
The application further improves that: the specific operation of refreshing the weights of all charging piles which send out the charging power request is as follows: and adding the current weight of each charging pile to the initial weight of each charging pile to obtain the weight of each charging pile.
The application discloses a power balance distribution method of a charging pile, which comprises the following steps:
step 1, acquiring charging power requests of all current charging piles, and calculating the request power of each charging pile for sending the charging power requests;
step 2, calculating the initial power weights of the charging piles according to the current charging power request of the charging piles, and adding the obtained initial power weights of all the charging piles to obtain a weight sum;
step 3, determining the executable times of power distribution according to the available power module of the current charging pile;
step 4, executing an allocation algorithm to obtain the power allocation sequence;
and 5, distributing power according to the sequence to finish the balanced distribution.
The application further improves that: the request power is obtained by subtracting the current charging gun output power from the charging pile demand power.
The application further improves that: the power initial weight of each charging pile is obtained by rounding and rounding P/x, wherein P is the request power, and x is the power of a single power module.
The application further improves that: the specific operation of the step 4 is as follows:
step 4.1, performing first allocation, and obtaining first power allocation sequencing by the charging pile with the highest power initial weight;
step 4.2, obtaining the power initial weight of the charging pile with power distribution, subtracting the weight sum, and obtaining the current weight of the charging pile;
and 4.3, refreshing weights of all charging piles: the current weight of each charging pile is added with the initial weight of each charging pile;
step 4.4, executing the next allocation, and obtaining the current power allocation sequence by the charging pile with the highest weight;
step 4.5, the weight sum of the charging piles distributed by power is obtained, and the current weight of the charging piles is obtained;
and 4.6, refreshing weights of all charging piles: the current weight of each charging pile is added with the initial weight of each charging pile;
and 4.7, sequentially executing the steps 4.4 to 4.6 until the current weight of all the charging piles is 0.
The beneficial effects of the application are as follows: when the charging piles send the charging power requests, the method executes the balanced distribution edge calculation algorithm, so that the charging power can be distributed fairly and quickly, the complete power of the charging piles can be utilized to the maximum extent, and the charging power requirement of the vehicle can be met to the maximum extent.
Drawings
FIG. 1 is a block diagram of a power equalizing distribution system of a charging pile according to an embodiment of the present application;
fig. 2 is a charging flow chart in an embodiment of the application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be noted that the embodiments described herein are only for explaining the present application and are not intended to limit the present application.
The application relates to a power balance distribution system of a charging pile, which comprises the charging pile and a charging pile, wherein the charging pile is connected with a plurality of charging piles through a CAN bus, the charging pile comprises a power management module, a plurality of power modules and a plurality of power distribution units, the power management module is connected with the power modules through a first CAN bus and is connected with the power distribution units through a second CAN bus, and the charging pile comprises a charging service module, a power request module and a charging gun;
the power management module is used for executing an equilibrium distribution edge calculation algorithm to schedule and distribute the direct-current change power of the charging stacks, and is responsible for recovering the distributed surplus power quota released after the power demand is reduced, and each charging stack is configured with one power;
the power module is an AC/DC rectifying module and is used for carrying out power conversion and output operation, the output power of a single power module is 20kW or 30kW, and one charging pile is provided with a plurality of power modules, and the number of the power modules is 24 or 40 in a conventional configuration;
the power distribution unit comprises a direct current contactor and a control loop thereof, namely PDU, and realizes connection of a power module output busbar by opening and closing the direct current contactor, and finally is connected to a charging gun of a charging pile, wherein one charging pile is provided with a plurality of power distribution modules;
the charging service module is positioned in the charging pile and is used for providing a man-machine interface for managing the charging service, and one charging pile is provided with one charging pile;
the power request module is positioned in the charging pile and is used for acquiring the charging requirement of the electric automobile at fixed time and simultaneously requesting and confirming the power of the charging pile, and one charging pile is provided with one charging pile;
and the charging gun performs charging output according to the quota.
According to the national standard communication protocol, the power interaction data of the charging pile and the electric automobile are carried out every 2-5S, and the electric automobile automatically updates the current charging requirement. Under the condition that the electric automobile increases the charging requirement, when the new power requirement is smaller than the allocated power quota, the output power is directly increased; when the power demand is greater than the allocated quota, power is output to the power quota first, and then the power request module applies for new power.
When the power request modules of the plurality of charging piles send power requests, the power management modules of the charging piles need to perform power distribution sequencing according to an equilibrium distribution algorithm, and respond to the power requests one by one until the available power of the charging pile is completely distributed. The process of power allocation ordering is as follows:
step 1, acquiring charging power requests of all current charging piles, and calculating the request power of each charging pile for sending the charging power requests; wherein the requested power is obtained by subtracting the maximum allowable output power (the output power of a single power module, namely 20 kW) of the current charging gun from the power required by the vehicle;
step 2, calculating the initial power weights of the charging piles according to the current charging power request of the charging piles, and adding the obtained initial power weights of all the charging piles to obtain a weight sum; wherein the power initial weight of each charging pile is obtained by dividing the request power by the output power of a single power module;
step 3, determining the executable times of power distribution according to the available power module of the current charging pile;
step 4, executing an allocation algorithm to obtain the power allocation sequence; the method comprises the following steps:
executing first distribution, and obtaining first power distribution sequencing by the charging pile with the highest power initial weight;
obtaining the power initial weight minus the weight sum of the power-distributed charging piles;
refreshing weights of all charging piles, namely adding the current weight of each charging pile to the initial weight of each charging pile;
performing secondary distribution, and obtaining secondary power distribution sequencing by the charging pile with the highest weight;
obtaining the weight sum of the charging piles with power distribution by subtracting the weight sum;
refreshing the weights of all charging piles;
sequentially executing subsequent allocation until the current weight of all charging piles is 0, and obtaining the sequence of current allocation;
and 5, distributing power according to the sequence, and completing the balanced distribution.
As shown in fig. 1, the charging pile system architecture of the present embodiment is as follows: a charging service module and a power request module are arranged in a single-gun charging pile. The charging pile system architecture is as follows: one charging pile is internally provided with 1 power management module, 40 power modules, 8 power distribution units and 8 charging piles, and the charging pile is matched with 8 charging piles, namely charging pile A-charging pile H.
As shown in fig. 2, the working principle of the power balance distribution system for one-to-eight charging pile is as follows: when a vehicle is inserted into the charging pile A, a user starts charging on the charging service module A, and the charging pile immediately distributes the lowest power quota (20 kW) for the charging pile A; the charging pile A is firstly in a charging handshake stage, then acquires charging current and voltage required by a vehicle through communication with the vehicle BMS system, and immediately charges the electric vehicle according to the current quota (namely 20kW of power of a single power module); then, the power request module of the charging pile A judges that the vehicle required power exceeds the current maximum allowable output power (20 kW), and applies power to the power management module of the charging pile; the power management module of the charging pile carries out balanced distribution edge calculation according to the number of available power modules of the current charging pile and the power application condition of the whole system; the result of balanced distribution is executed by a charging pile power management module, and the distribution of power is realized through a power distribution unit and a power module; obtaining a quota of charging gun, and charging and outputting according to the new quota; when the quota caused by the reduction of the demand of the electric automobile is exceeded, immediately recovering the quota through the power management module; when the quota obtained by the charging gun A is lower than the automobile demand, carrying out power application again; when the electric automobile is charged, the charging gun A immediately returns the surplus power quota.
The following description is made in connection with the actual scenario:
the charging stack is totally provided with 40 power modules with 20kW, wherein 3 modules are in a fault state, and normally operate for 37 modules, and the maximum power module can output 720kW. Currently D, E two charging piles are respectively outputting in charging according to 120kW of power, F and G are outputting in charging according to 100kW, H charging piles are outputting in charging according to 70kW, and 5 charging piles in charging occupy (6+6+5+5+4) =26 charging modules in total. A. B, C three charging piles are in an idle state, and each charging pile is provided with a power module (20 kW) for distribution.
At a certain moment, the charging guns corresponding to the three charging piles A\B\C of A, B, C start to charge. According to the vehicle demand, wherein A rifle charge demand power 120kW, B rifle charge demand power 80kW, C rifle charge demand power 40kW.
Firstly, a charging pile A sends out power demand, and the request power is 100kW (120-20); b, the charging pile sends out a power demand, the request power is 60kW (80-20), C, the charging pile sends out a power demand, and the request power is 20kW (40-20);
the second step, the power management module of the charging pile calculates the power initial weight sum of the charging pile A, the charging pile B and the charging pile C; wherein, the power initial weight of the charging pile A is qa=100/20=5; the initial weight of the power of the charging pile B is Qb=60/20=3; the initial weight of the power of the C charging pile is qc=20/20=1; the sum of weights is qo=qa+qb+qc=5+3+1=9;
thirdly, the number of the modules which can be allocated to the current charging pile is N=40-3-26-3=8;
fourth, power allocation ordering is performed, as shown in table 1;
TABLE 1
And when the operation is executed to the 9 th round, the three charging pile authorities with requirements are all changed to 0, and the sequencing is finished. The current allocation order is therefore ABACABABA;
and fifthly, the current allocable times are 8 times, and according to the sequence, the ABAB can obtain power, and the charging pile A selected by the 9 th time can not obtain power. And finally, the charging pile A obtains 4 times of power of 80kW, the charging pile B obtains 3 times of power of 60kW, and the charging pile C obtains 1 time of power of 20kW. After the distribution of the round is finished, the power of 20kW of the charging pile A cannot be met, and the system can respond after the power distribution is performed again when other charging piles release power.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that various changes and substitutions are possible within the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (6)
1. The utility model provides a fill electric pile power balance distribution system, includes fills electric pile and fills electric pile, it is connected with a plurality of to fill electric pile through CAN bus to fill electric pile, its characterized in that: the charging pile comprises a power management module, a plurality of power modules and a plurality of power distribution units, wherein the power management module is connected with the power modules through a first CAN bus and is connected with the power distribution units through a second CAN bus, and the charging pile comprises a charging service module, a power request module and a charging gun;
the power management module is used for executing an equilibrium distribution edge calculation algorithm to schedule and distribute the direct-current change power of the charging stacks, and is responsible for recovering the distributed surplus power quota released after the power demand is reduced, and each charging stack is configured with one power;
the power module is used for performing power conversion and output operation;
the power distribution unit is used for connecting the charging pile with the power module and distributing power;
the charging service module is used for managing the charging service of the charging gun;
the power request module is used for acquiring the charging requirement of the electric automobile at regular time, judging whether the charging requirement exceeds the current maximum allowable output power of the charging gun, and if so, carrying out charging power request and power confirmation on the power management module of the charging pile;
the charging gun performs charging output according to the quota;
after the power management module obtains the charging power request of the power request module, carrying out balanced distribution edge calculation according to the available power of the current charging pile and the power application condition of the whole system, scheduling the power module of the charging pile according to a calculation result, and carrying out power distribution through a power distribution unit;
the specific process of calculating the balanced distribution edge is as follows:
a. calculating the request power of each charging pile according to the charging power request sent by each power request module;
b. calculating the power initial weights of all charging piles sending out the charging power request, and adding all obtained power initial weights to obtain a weight sum;
c. setting the number of the allocable power modules as the execution times of power allocation;
d. performing power allocation: the charging pile with the highest weight obtains primary power distribution sequencing, and the power initial weight of the charging pile with the obtained power distribution is subtracted by the weight sum to obtain the current weight of the charging pile; and refreshing the weights of all the charging piles sending the charging power request, and carrying out power distribution again according to the refreshed weights until the current weights of all the charging piles are 0, thereby obtaining the final power distribution sequence.
2. The power balance distribution system of claim 1, wherein: the power module is an AC/DC rectification module, and the output power of the AC/DC rectification module is 20kW or 30kW.
3. The power balance distribution system of claim 1, wherein: the number of the power distribution units of each charging pile is the same as that of the charging piles, and the charging guns of the charging piles perform charging output according to the sum of the power quota of the corresponding power distribution unit and the power of the single power module.
4. The power balance distribution system of claim 1, wherein: the specific operation of refreshing the weights of all charging piles sending out the charging power request is as follows: and adding the current weight of each charging pile to the initial weight of each charging pile to obtain the weight of each charging pile.
5. A charging pile power balance distribution method is characterized in that: the method comprises the following steps:
step 1, acquiring charging power requests of all current charging piles, and calculating the request power of each charging pile for sending the charging power requests;
step 2, calculating the initial power weights of the charging piles according to the current charging power request of the charging piles, and adding the obtained initial power weights of all the charging piles to obtain a weight sum;
step 3, determining the executable times of power distribution according to the available power module of the current charging pile;
step 4, executing an allocation algorithm to obtain the power allocation sequence;
step 5, distributing power according to the sequence to finish the balanced distribution;
the power initial weight of each charging pile is obtained by rounding and rounding P/x, wherein P is the request power, and x is the power of a single power module;
the specific operation of the step 4 is as follows:
step 4.1, performing first allocation, and obtaining first power allocation sequencing by the charging pile with the highest power initial weight;
step 4.2, obtaining the power initial weight of the charging pile with power distribution, subtracting the weight sum, and obtaining the current weight of the charging pile;
and 4.3, refreshing weights of all charging piles: the current weight of each charging pile is added with the initial weight of each charging pile;
step 4.4, executing the next allocation, and obtaining the current power allocation sequence by the charging pile with the highest weight;
step 4.5, the weight sum of the charging piles distributed by power is obtained, and the current weight of the charging piles is obtained;
and 4.6, refreshing weights of all charging piles: the current weight of each charging pile is added with the initial weight of each charging pile;
and 4.7, sequentially executing the steps 4.4 to 4.6 until the current weight of all the charging piles is 0.
6. The method for balanced distribution of power of a charging pile according to claim 5, wherein: the request power is obtained by subtracting the current charging gun output power from the charging pile demand power.
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