CN112421740B - Charging pile system and charging pile power distribution control method - Google Patents

Charging pile system and charging pile power distribution control method Download PDF

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Publication number
CN112421740B
CN112421740B CN202011205848.XA CN202011205848A CN112421740B CN 112421740 B CN112421740 B CN 112421740B CN 202011205848 A CN202011205848 A CN 202011205848A CN 112421740 B CN112421740 B CN 112421740B
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sub
charging
modules
module
power
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CN112421740A (en
Inventor
潘子娇
张华丽
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • 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
    • 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
    • B60L53/34—Plug-like or socket-like devices specially adapted for contactless inductive charging of electric vehicles
    • 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
    • B60L53/67—Controlling two or more charging stations
    • 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

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

Abstract

The application provides a charging pile system and a charging pile power distribution control method, wherein a charging pile comprises at least one AC/DC sub-module and at least one DC/DC sub-module; the input ends of all the AC/DC sub-modules are connected with an alternating current power supply, the output ends of all the AC/DC sub-modules are connected with a direct current bus of the charging pile system, and meanwhile, the input ends of all the DC/DC sub-modules are connected with the direct current bus, and the output ends of all the DC/DC sub-modules are connected with the output ends of the charging pile system. All the AC/DC sub-modules in the scheme are connected to the same direct current bus, and energy is input for the direct current bus together, so that the energy requirements of all the DC/DC sub-modules are guaranteed, the AC/DC sub-modules participating in charging work are flexibly distributed according to the charging requirements by utilizing the scheme, and the load rate of the AC/DC sub-modules is guaranteed to be maintained near an optimal efficiency point, so that the overall efficiency of the AC/DC sub-modules is improved, and the overall efficiency of the whole charging pile system is further improved.

Description

Charging pile system and charging pile power distribution control method
Technical Field
The invention belongs to the technical field of charging and discharging, and particularly relates to a charging pile system and a charging pile power distribution control method.
Background
The charging pile is a station for charging a power battery (for example, a battery on an electric automobile), the input end of the charging pile is directly connected with an alternating current power grid, and the output end of the charging pile is provided with a charging gun for charging the power battery.
In the charging pile in the related art, two parts, namely an AC/DC sub-module and a DC/DC sub-module, are generally included as a whole, and may be referred to as a charging module. When a certain charging module is started, both an AC/DC sub-module and a DC/DC sub-module inside the module need to be started, for example, a 120kW double-gun charging pile shown in fig. 1, if a gun requests 10kW and a gun B requests 10kW, the charging module 1 provides 10kW functions for the gun A, the charging module 4 provides 10kW power for the gun B, the charging modules 2 and 3 can be in an idle state, and it can be seen that 2 AC/DC sub-modules and DC/DC sub-modules need to be started. However, from the power consideration, only 1 AC/DC sub-module can provide 30kW, so as to completely meet the requirements of the a gun and the B gun, while the charging pile shown in fig. 1 needs to turn on 2 AC/DC, and the load rate of each AC/DC sub-module is not high, the lower the load rate is, the lower the efficiency is, and the lower the efficiency of the charging pile is.
Disclosure of Invention
In view of the above, the present application aims to provide a charging pile system and a charging pile power distribution control method, so as to solve the problem that the charging pile system in the related art has low efficiency due to the fact that each charging module works independently and an AC/DC sub-module cannot be reasonably utilized, and the disclosed specific technical scheme is as follows:
In a first aspect, the present application provides a charging pile system comprising: the system comprises a controller, at least one AC/DC sub-module and at least one DC/DC sub-module, wherein the total power of the at least one DC/DC sub-module is matched with the total power of the at least one AC/DC sub-module;
The input end of the at least one AC/DC sub-module is connected with an alternating current power supply, and the output end of the at least one AC/DC sub-module is connected with a direct current bus of the charging pile system;
the input end of the at least one DC/DC sub-module is connected with the direct current bus, and the output end of the at least one DC/DC sub-module is connected with the output end of the charging pile system;
The controller is used for controlling the running states of the at least one AC/DC sub-module and the at least one DC/DC sub-module according to the charging power requirement.
In a possible implementation manner of the first aspect, an output end of each charging pile system is connected to a charging gun. .
In another possible implementation manner of the first aspect, the number of charging guns is one or at least two;
The number of the DC/DC sub-modules is greater than or equal to the number of the charging guns.
In a further possible implementation manner of the first aspect, when the number of the charging guns is at least two, a control switch is arranged between the output end of the DC/DC sub-module and each charging gun;
the controller is also used for controlling the DC/DC sub-modules connected with the charging guns by controlling the on-off state of the control switch so as to adjust the charging power of the at least two charging guns.
In a further possible implementation manner of the first aspect, the method further includes: at least one redundant DC/DC sub-module;
The total power of the at least one redundant DC/DC sub-module and the at least one DC/DC sub-module is greater than the total power of the at least one AC/DC sub-module;
The at least one redundant DC/DC sub-module is connected in parallel with the at least one DC/DC sub-module.
In another possible implementation manner of the first aspect, the number of the charging guns is at least two;
The output end of each redundant DC/DC sub-module is respectively connected with each charging gun through a control switch;
The controller is also used for controlling the on-off state of the control switch so as to control the charging gun connected with each redundant DC/DC sub-module and adjust the charging power of each charging gun.
In a further possible implementation of the first aspect, at least one redundant AC/DC sub-module is further comprised, the total power of the at least one redundant AC/DC sub-module and the at least one AC/DC sub-module being greater than the total power of the at least one DC/DC sub-module.
In a further possible implementation manner of the first aspect, the controller is further configured to select, according to a charging power requirement value of the charging gun and operation parameters of the redundant AC/DC sub-module and each of the AC/DC sub-modules, an AC/DC sub-module that meets the charging power requirement value and has a short accumulated operating time to participate in the charging operation.
In a second aspect, the present application further provides a power distribution control method in a charging pile system, which is characterized in that the method is applied to the charging pile system in any possible implementation manner of the first aspect, and the method includes:
Acquiring a charging power demand value of a charging gun;
Determining a target AC/DC sub-module and a target DC/DC sub-module for providing electric energy for the charging gun according to a power distribution strategy according to the charging power requirement value, the power of the single AC/DC sub-module and the power of the single DC/DC sub-module;
and controlling the target AC/DC sub-module and the target DC/DC sub-module to provide electric energy for the charging gun.
In a possible implementation manner of the second aspect, the determining, according to a power distribution policy, a target AC/DC sub-module and a target DC/DC sub-module for providing electric energy to the charging gun according to the charging power requirement value, the power of the single AC/DC sub-module and the single DC/DC sub-module includes:
According to the sum of charging power demand values of all charging guns in the charging pile system and the power of each AC/DC sub-module, determining the minimum number of AC/DC sub-modules with the total power larger than or equal to the sum of the charging power demand values as target AC/DC sub-modules;
And for any charging gun, determining the DC/DC sub-module which meets the charging power requirement value of the charging gun and has the minimum value as the target DC/DC sub-module.
In another possible implementation manner of the second aspect, the determining, according to a sum of charging power demand values of each charging gun in the charging pile system and power of each AC/DC sub-module, a minimum number of AC/DC sub-modules with a total power greater than or equal to the sum of charging power demand values as the target AC/DC sub-module includes:
Determining a target number with the total power larger than or equal to the sum of the charging power demand values and the minimum value according to the sum of the charging power demand values of all the charging guns and the power of all the AC/DC sub-modules;
And when the target number is smaller than the total number of the AC/DC sub-modules connected with the direct current bus, selecting the target number of the AC/DC sub-modules with short accumulated working time from the AC/DC sub-modules connected with the direct current bus as the target AC/DC sub-modules.
In still another possible implementation manner of the second aspect, the determining, for any charging gun, that the DC/DC sub-module that meets the charging power requirement value of the charging gun and has the smallest value is the target DC/DC sub-module includes:
according to parameters of the DC/DC sub-modules connected with the charging gun, determining a first target number of the DC/DC sub-modules with the total power larger than a charging power requirement value of the charging gun and the minimum value;
And when the first target number is smaller than the total number of the DC/DC sub-modules connected with the charging gun, selecting the first target number of DC/DC sub-modules with short accumulated working time from all the DC/DC sub-modules connected with the charging gun as the target DC/DC sub-modules.
In a further possible implementation manner of the second aspect, the charging gun comprises a first charging gun and a second charging gun, and the DC/DC sub-module comprises at least one redundant DC/DC sub-module;
for any charging gun, determining the DC/DC sub-module which meets the charging power requirement value of the charging gun and has the minimum value as the target DC/DC sub-module, and comprising:
Determining a second target number of redundant DC/DC sub-modules required when the charging power demand of the charging gun is greater than the power sum of the DC/DC sub-modules connected to the charging gun;
And controlling the second target number of redundant DC/DC sub-modules to be connected with the charging gun, so that all the DC/DC sub-modules connected with the charging gun and the second target number of redundant DC/DC sub-modules jointly provide electric energy for the charging gun.
The application provides a charging pile system, wherein a charging pile comprises at least one AC/DC sub-module and at least one DC/DC sub-module; the input ends of all the AC/DC sub-modules are connected with an alternating current power supply, the output ends of all the AC/DC sub-modules are connected with a direct current bus, and meanwhile, the input ends of all the DC/DC sub-modules are connected with the direct current bus, and the output ends of all the DC/DC sub-modules are connected with the output ends of the charging piles. All the AC/DC sub-modules in the scheme are connected to the same direct current bus, and energy is input for the direct current bus together, so that the energy requirements of all the DC/DC sub-modules are guaranteed, the AC/DC sub-modules participating in charging work are flexibly distributed according to the charging requirements by utilizing the scheme, and the load rate of the AC/DC sub-modules is guaranteed to be maintained near an optimal efficiency point, so that the overall efficiency of the AC/DC sub-modules is improved, and the overall efficiency of the whole charging pile system is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are 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 structural view of a charging pile provided in the related art;
Fig. 2 is a schematic structural diagram of a dual gun charging pile system according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a dual-gun 120kW charging pile according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a single-gun 120kW charging pile according to an embodiment of the present application;
FIG. 5a is a schematic structural view of another charging pile according to an embodiment of the present application;
fig. 5b is a schematic structural view of still another charging pile according to an embodiment of the present application;
Fig. 6a is a schematic structural view of another charging pile according to an embodiment of the present application;
FIG. 6b is a schematic structural view of another charging pile according to an embodiment of the present application;
Fig. 7a is a schematic structural diagram of a single-gun charging pile with a redundant DC/DC sub-module according to an embodiment of the present application;
FIG. 7b is a schematic diagram of another alternative embodiment of the present application for a dual gun charging stake with redundant DC/DC sub-modules added thereto;
Fig. 8 is a schematic structural diagram of a charging pile with a redundant AC/DC sub-module according to an embodiment of the present application;
Fig. 9 is a flowchart of a method for controlling power distribution in a charging pile according to an embodiment of the present application;
Fig. 10 is a flowchart of a process for determining a target AC/DC sub-module and a DC/DC sub-module according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 2, a schematic structural diagram of a charging pile system according to an embodiment of the present application is shown, where the charging pile system includes an AC/DC sub-module, a DC/DC sub-module, and a controller, the number of the AC/DC sub-modules may be one or more, and the number of the DC/DC sub-modules may be one or more.
The input ends of all the AC/DC sub-modules are connected with an alternating current power supply, and the output ends of all the AC/DC sub-modules are commonly connected with the same direct current bus.
The input ends of all the DC/DC sub-modules are commonly connected with the same direct current bus, the output ends of all the DC/DC sub-modules are connected with the output ends of the charging piles, and the output ends of each charging pile are connected with one charging gun, so that the number of the output ends of the charging piles is the same as that of the charging guns.
In other embodiments of the application, the output of a part of the AC/DC sub-modules in the charging pile system may be connected to the same DC bus, and correspondingly, the input of a DC/DC sub-module matching the total power of said part of the AC/DC sub-modules may be connected to the DC bus. Namely, the part of the independent charging modules in the charging pile are removed, and meanwhile, the part of the independent charging modules are reserved.
The total power of all the AC/DC sub-modules is matched with the total power of all the DC/DC sub-modules, and the power of a single AC/DC sub-module and the power of a single DC/DC sub-module can be the same or different, for example, greater or smaller, i.e. the scheme provided by the application does not need to be completely consistent.
The number of the charging guns can be 1 or at least 2, and the specific number of the charging guns can be designed according to the requirements of practical application scenes. The number of DC/DC sub-modules is greater than or equal to the number of charging guns.
For example, where the charging stake system includes 1 charging gun, it may include 1 or at least 2 DC/DC sub-modules; when the charging pile system comprises 2 charging guns, 2 or more than 2 DC/DC sub-modules may be included.
The number of AC/DC sub-modules need not be greater than the number of charging guns, and when the charging guns are 1, the number of AC/DC sub-modules may be greater than, or equal to, 1; when the number of charging guns is at least 2, the number of AC/DC sub-modules may be greater than, less than, or equal to the number of charging guns; i.e. the number of AC/DC sub-modules may be at least one, whether the number of charging guns is 1 or more.
Also, the number of AC/DC sub-modules and the number of DC/DC sub-modules may be the same or different, for example, the charging pile includes 1 AC/DC sub-module and at least 2 DC/DC sub-modules; as another example, the charging stake includes at least 2 AC/DC sub-modules and 1 DC/DC sub-module; the charging stake includes at least 2 AC/DC sub-modules and at least 2 DC/DC sub-modules.
The controller is used for controlling the running states of each AC/DC sub-module and each DC/DC sub-module according to the charging power requirement.
The controller controls the running states of the AC/DC sub-module and the DC/DC sub-module according to a preset power distribution strategy.
For example, power can be distributed according to the efficiency of the AC/DC sub-module, and the corresponding efficiency is the highest when the load factor of the AC/DC sub-module is about 75%, so that the number of AC/DC sub-modules participating in charging can be adjusted according to the load factor, and the load factor of each AC/DC sub-module is ensured to be near the highest efficiency point as much as possible.
For another example, power can be distributed according to the temperature, for example, when the ambient temperature of the charging pile is higher, one more AC/DC sub-module can be started, the load rate of a single AC/DC sub-module is reduced, the temperature of each AC/DC sub-module is reduced, the excessive temperature derating or shutdown of the charging pile is avoided, and meanwhile, the service life of the AC/DC sub-module can be prolonged.
The following uses the charging pile shown in fig. 3 as an example, and focuses on intelligently controlling the operation state of the AC/DC sub-module according to the charging power requirement.
As shown in fig. 3, a schematic structural diagram of a charging pile with 120kW of double guns is shown, wherein the double guns refer to two charging guns, and 120kW refers to the maximum charging power that the charging pile can provide.
The dual gun 120kW charging stake shown in fig. 3 includes 4 30kW AC/DC sub-modules and 4 30kW DC/DC sub-modules.
In this scenario, if charging gun a and charging gun B both require 10kW of charging power, only one 30kW AC/DC sub-module needs to be turned on with the charging stake shown in fig. 3, and at the same time, 2 DC/DC sub-modules are turned on to respectively supply energy to both charging guns.
It can be seen that, with the charging pile of the present application, only one 30kW AC/DC sub-module needs to be turned on to meet the charging power requirement of 10kW for each of the two charging guns, and compared with the charging pile scheme shown in fig. 1, the load factor of the AC/DC sub-module is improved from 33% to 66%, so that the efficiency of the AC/DC sub-module is improved, and meanwhile, the same charging power is provided.
The following description focuses on an example of an intelligent switching DC/DC sub-module, taking the charging stake shown in FIG. 4 as an example.
As shown in fig. 4, the single gun 120kW charging stake includes 430 kW AC/DC sub-modules and 430 kW DC/DC sub-modules.
If the initial power requirement of charging is 80kW, 3 DC/DC sub-modules are started, and the rest 1 DC/DC sub-modules are in a dormant state; as the battery SOC increases, the charging current decreases, the required power decreases to 50kW, only 2 DC/DC sub-modules need to be turned on at this time, and the remaining 2 DC/DC sub-modules are in a sleep state; when the battery is fully charged, the required power is reduced to below 30kW, at the moment, 1 DC/DC submodule can meet the charging requirement, and the rest 3 DC/DC submodules are in a dormant state. In the whole charging process, the number of the DC/DC sub-modules participating in charging is determined according to the requested power, so that the load rate of each DC/DC sub-module participating in charging is ensured to be near the optimal efficiency point as much as possible, and the efficiency of the whole pile is improved.
It should be noted that, the controller may send an on/off command to the AC/DC sub-module and the DC/DC sub-module to control the operation states of the AC/DC sub-module and the DC/DC sub-module.
According to the charging pile system provided by the embodiment of the application, the AC/DC sub-modules and the DC/DC sub-modules in the charging pile are connected with the same direct current bus, specifically, the input ends of all the AC/DC sub-modules are connected with an alternating current power supply, the output ends of all the AC/DC sub-modules are connected with the same direct current bus, meanwhile, the input ends of all the DC/DC sub-modules are connected with the direct current bus, and the output ends of all the DC/DC sub-modules are connected with a charging gun. All the AC/DC sub-modules in the scheme are connected to the same direct current bus, and energy is input for the direct current bus together, so that the energy requirements of all the DC/DC sub-modules are guaranteed, the AC/DC sub-modules participating in charging work are flexibly distributed according to the charging requirements by utilizing the scheme, and the load rate of the AC/DC sub-modules is guaranteed to be maintained near an optimal efficiency point, so that the overall efficiency of the AC/DC sub-modules is improved, and the overall efficiency of the whole charging pile system is further improved.
Typically a single AC/DC sub-module (or DC/DC sub-module) is lower cost and less bulky than multiple AC/DC sub-modules (or DC/DC sub-modules) of equal total power.
The power of the single AC/DC sub-module and the power of the single DC/DC sub-module in the charging pile system are not required to be consistent, so that the AC/DC sub-module suitable for the power level can be selected from the factors of cost, volume, control design and the like.
As shown in fig. 5a, taking a 120kW charging pile as an example, the charging pile includes 2 AC/DC sub-modules of 60kW and 3 DC/DC sub-modules of 40kW (or 4 of 30 kW), and the total power of the AC/DC sub-modules is equal to the total power of the DC/DC sub-modules. But the total cost and volume of 260 kW AC/DC sub-modules is lower than the total cost and volume of 340 kW AC/DC sub-modules.
As shown in fig. 5b, taking a 120kW charging pile as an example, 1 AC/DC sub-module of 120kW and 4 DC/DC sub-modules of 30kW (or 3 of 40 kW) are included, the total power of the AC/DC sub-modules and the total power of the DC/DC sub-modules are equal, but the cost and volume of the 1 AC/DC sub-module of 120kW are lower than that of the 4 AC/DC sub-modules of 30 kW.
Similarly, the DC/DC sub-module suitable for the power level can be selected from the factors of cost, volume, control design and the like.
As shown in fig. 6a, a 120kW charging stake may include: 340 kW of AC/DC sub-modules and 260 kW of DC/DC sub-modules. The cost and volume of 260 kW DC/DC sub-modules are lower than the total cost and volume of 340 kW DC/DC sub-modules.
As shown in fig. 6b, a 120kW charging stake may include: 340 kW AC/DC sub-modules and 1 120kW DC/DC sub-module. Wherein the cost and volume of 1 120kW DC/DC sub-module is lower than the total cost and volume of 4 30kW DC/DC sub-modules.
In another possible implementation manner of the present application, in order to improve reliability of the charging pile and prolong service life of the DC/DC sub-module, a redundant DC/DC sub-module is added in the charging pile by comprehensively considering cost and volume of the DC/DC sub-module, and total power of the AC/DC sub-module and the DC/DC sub-module may be different, that is, total power of the AC/DC sub-module is smaller than total power of the DC/DC sub-module.
Referring to fig. 7a, a schematic structural diagram of another charging pile system according to an embodiment of the present application is shown, in which at least one redundant DC/DC sub-module is added in the charging pile.
In this embodiment, a single gun charging pile is taken as an example for explanation, and the added redundant DC/DC sub-module is connected in parallel with other DC/DC sub-modules, i.e. the input end of the redundant DC/DC sub-module is connected with a DC target, and the output end of the redundant DC/DC sub-module is connected with a charging gun.
Taking a single gun 120kW charging stake as an example, 130 kW DC/DC sub-module is added, namely the redundant DC/DC sub-module 3 shown in fig. 7 a.
When any DC/DC sub-module in the charging pile breaks down, the operation of replacing the broken down DC/DC sub-module by the redundant DC/DC sub-module can be switched to ensure that the power of the charging pile is maintained at 120kW.
In addition, the redundant DC/DC sub-module can work with other DC/DC sub-modules in turn, so that the service life of the DC/DC sub-module is prolonged.
For example, DC/DC sub-module 1 has been operated cumulatively for 100 hours, DC/DC sub-module 2 has been operated cumulatively for 80 hours, and DC/DC sub-module 3 has been operated cumulatively for 40 hours. If the charging gun requests 40kW of power, two DC/DC sub-modules with short accumulated operating time, i.e. DC/DC sub-module 2 and DC/DC sub-module 3, can be selected to work together to provide 40kW of power.
Referring to fig. 7b, a schematic structural diagram of still another charging pile system according to an embodiment of the present application is shown, in which a 120kW double-gun charging pile is taken as an example for illustration, and a 30kW DC/DC sub-module, that is, a redundant DC/DC sub-module 3 is added.
DC/DC sub-modules 1 and 2 are connected to charging gun a, and DC/DC sub-modules 4 and 5 are both connected to pre-charging B.
The redundant DC/DC submodule 3 is arranged between the DC/DC submodule 2 and the DC/DC submodule 4, a control switch K1 is arranged between the redundant DC/DC submodule 3 and the DC/DC submodule 2, and a control switch K2 is arranged between the redundant DC/DC submodule 3 and the DC/DC submodule 4.
The controller controls the charging gun connected with the redundant DC/DC sub-module by controlling the on-off states of the K1 and the K2, for example, when the K1 is closed and the K2 is opened, the redundant DC/DC sub-module is connected with the charging gun A; when K1 is opened and K2 is closed, the redundant DC/DC sub-module is connected with the pre-charging B. It can be seen that the redundant DC/DC sub-module can be switched to the charging gun a or charging gun as required, so that the maximum charging power of a single gun can be raised from 60kW to 90kW, for example, when K1 is closed, K2 is open, the maximum charging power of charging gun a is 90kW.
Besides the maximum charging power of the single gun can be improved, the redundant DC/DC sub-module can replace the failed DC/DC sub-module to work, so that the charging power of the single gun is ensured to be maintained at 60kW, and the stability and reliability of the charging pile are improved.
In addition, the redundant DC/DC sub-module can work with other DC/DC sub-modules in turn, so that the service life of the DC/DC sub-module is prolonged, and the service life of the whole charging pile is prolonged.
In yet another possible implementation of the present application, in order to improve the reliability of the entire pile and to extend the use of AC/DC sub-modules, redundant AC/DC sub-modules may be added within the charging pile.
As shown in fig. 8, a schematic structural diagram of still another charging pile system according to an embodiment of the present application is shown, and the embodiment is still illustrated by taking a 120kw charging pile as an example.
As shown in fig. 8, the charging pile system comprises 5 AC/DC sub-modules of 30kW, wherein the AC/DC sub-module 3 is an added redundant AC/DC sub-module.
In the application scene, the redundant AC/DC sub-module can work with other AC/DC sub-modules in turn, so that the service life of the AC/DC sub-module is prolonged.
The controller selects a specified number of AC/DC sub-modules which meet the charging power requirement value and have shorter accumulated working time to be in a working state, and other AC/DC sub-modules are in a shutdown state.
In one possible implementation of the present application, the controller may send a power-on command (or a power-off command) to the AC/DC sub-module to control the corresponding AC/DC sub-module to be in an operating state (or a power-off state).
According to the charging pile system provided by the embodiment, the redundant AC/DC sub-modules are additionally arranged, and the redundant AC/DC sub-modules and other AC/DC sub-modules are controlled to work alternately, so that when one AC/DC sub-module in the charging pile fails, the redundant AC/DC sub-modules can replace the failure module to work, so that the charging pile can maintain the corresponding charging capacity, and the reliability of the whole pile is improved; in addition, the redundant AC/DC submodules and other AC/DC submodules work in turn, so that the service life of each AC/DC submodule can be prolonged, and the service life of the whole charging pile is prolonged.
Corresponding to the charging pile system, the application also provides a power distribution control method embodiment of the charging pile system.
Referring to fig. 9, a flowchart of a power distribution control method of a charging pile system according to an embodiment of the present application is shown, and the method is applied to the charging pile system shown in fig. 2.
As shown in fig. 9, the method may include the steps of:
S110, acquiring a charging power requirement value of the charging gun.
S120, determining a target AC/DC sub-module and a target DC/DC sub-module for providing electric energy for the charging gun according to a power distribution strategy according to the charging power requirement value and the power of the single AC/DC sub-module and the single DC/DC sub-module.
The power distribution strategy refers to a process of distributing power to the AC/DC sub-module or the DC/DC sub-module, i.e., determining the AC/DC sub-module and the DC/DC sub-module that participate in the charging operation.
The power allocation strategy may be set in advance according to requirements, for example, according to the efficiency allocation of the AC/DC sub-modules, and for example, according to the ambient temperature allocation.
Taking the power distribution according to the efficiency of the AC/DC sub-module as an example for illustration, as shown in fig. 10, the process of S120 includes the steps of:
S121, determining the minimum number of AC/DC sub-modules with total power larger than the sum of the charging power demand values as target AC/DC sub-modules according to the sum of the charging power demand values of all the charging guns in the charging pile system and the power of each AC/DC sub-module.
In an application scenario (for example, redundant AC/DC submodules are additionally arranged in a charging pile), when the number of the AC/DC submodules to be started is smaller than the total number of the AC/DC submodules connected with a direct-current bus, a specified number of AC/DC submodules with short accumulated working time are selected from all the AC/DC submodules to serve as target AC/DC submodules.
Under the application scene that has set up redundant AC/DC submodule in the electric pile, redundant AC/DC submodule can improve the reliability of electric pile that fills to and prolong the life who fills electric pile interior AC/DC submodule, and then prolong the life who fills electric pile entirely.
S122, for any charging gun, determining the DC/DC sub-module which meets the charging power requirement value of the charging gun and has the smallest value as the target DC/DC sub-module.
And determining the number of the DC/DC sub-modules with the total power larger than the charging power required value and the minimum value as a first target number according to the required charging power.
In one application scenario of the present application, the first target number of DC/DC sub-modules to be turned on is smaller than the total number of DC/DC sub-modules connected to the charging gun, and in this case, the first target number of DC/DC sub-modules with the shortest cumulative working time may be selected as the target DC/DC sub-modules.
In another application scenario of the application, a redundant DC/DC sub-module is additionally arranged in a single-gun charging pile, such as the charging pile shown in fig. 7, and in such an application scenario, when the faulty DC/DC sub-module is detected, the redundant DC/DC sub-module is started to replace the faulty DC/DC sub-module, so that the charging pile maintains the original charging power, and the reliability and stability of the charging pile are improved. In addition, under the application scene, the redundant DC/DC submodule and other DC/DC submodules can be controlled to work in turn, so that the service life of the DC/DC submodule is prolonged.
In another application scene of the application, at least one redundant DC/DC sub-module is additionally arranged in the double-gun charging pile, as shown in the charging pile in fig. 8, when the charging power requirement value of any charging gun is greater than the power sum of the DC/DC sub-modules connected with the charging gun, the second target number of the redundant DC/DC sub-modules which need to be started is determined; and controlling the second target number of redundant DC/DC sub-modules to provide power to the charging gun in conjunction with the other DC/DC sub-modules.
In another application scenario of the application, at least one redundant DC/DC sub-module is additionally arranged in the double-gun charging pile.
For any charging gun, determining a third target number of DC/DC sub-modules with the total power larger than a charging power requirement value and the minimum value according to parameters of the DC/DC sub-modules connected with the charging gun;
When the charging power required by the charging gun is smaller than or equal to the total power of the DC/DC sub-modules connected with the charging gun, selecting a third target number of DC/DC sub-modules with shortest accumulated working time from all the DC/DC sub-modules and redundant DC/DC sub-modules connected with the charging gun, and putting the third target number of DC/DC sub-modules into charging work.
S130, controlling the target AC/DC sub-module and the target DC/DC sub-module to provide charging power for the charging gun.
According to the power distribution control method in the charging pile, the appointed number of AC/DC sub-modules in the charging pile are all connected with the same direct current bus, and the appointed number of DC/DC sub-modules are connected with the same direct current bus. And determining a target AC/DC sub-module and a target DC/DC sub-module which participate in charging work according to a power distribution strategy according to the charging power requirement value and the power of the single AC/DC sub-module and the single DC/DC sub-module, and controlling the determined target AC/DC sub-module and the determined target DC/DC sub-module to provide electric energy for a charging gun. According to the scheme, the AC/DC sub-module and the DC/DC sub-module which participate in the charging work can be flexibly adjusted according to the charging requirement and the configuration parameters in the charging pile, and the load rate of the AC/DC sub-module is ensured to be maintained near the optimal efficiency point, so that the overall efficiency of the AC/DC sub-module is improved, and the overall efficiency of the whole charging pile system is further improved.
For the foregoing method embodiments, for simplicity of explanation, the methodologies are shown as a series of acts, but one of ordinary skill in the art will appreciate that the present invention is not limited by the order of acts, as some steps may, in accordance with the present invention, occur in other orders or concurrently. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present invention.
It should be noted that the technical features described in each embodiment in this specification may be replaced or combined with each other, and each embodiment is mainly described in a different manner from other embodiments, and identical and similar parts between the embodiments are referred to each other. For the apparatus class embodiments, the description is relatively simple as it is substantially similar to the method embodiments, and reference is made to the description of the method embodiments for relevant points.
The steps in the method of the embodiments of the present application may be sequentially adjusted, combined, and deleted according to actual needs.
The device and the modules and the submodules in the terminal in the embodiments of the application can be combined, divided and deleted according to actual needs.
In the embodiments provided in the present application, it should be understood that the disclosed terminal, apparatus and method may be implemented in other manners. For example, the above-described terminal embodiments are merely illustrative, and for example, the division of modules or sub-modules is merely a logical function division, and there may be other manners of division in actual implementation, for example, multiple sub-modules or modules may be combined or integrated into another module, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or modules, which may be in electrical, mechanical, or other forms.
The modules or sub-modules illustrated as separate components may or may not be physically separate, and components that are modules or sub-modules may or may not be physical modules or sub-modules, i.e., may be located in one place, or may be distributed over multiple network modules or sub-modules. Some or all of the modules or sub-modules may be selected according to actual needs to achieve the purpose of the embodiment.
In addition, each functional module or sub-module in the embodiments of the present application may be integrated in one processing module, or each module or sub-module may exist alone physically, or two or more modules or sub-modules may be integrated in one module. The integrated modules or sub-modules may be implemented in hardware or in software functional modules or sub-modules.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (13)

1. A charging pile system, comprising: the system comprises a controller, a plurality of AC/DC sub-modules and a plurality of DC/DC sub-modules, wherein the total power of the plurality of DC/DC sub-modules is matched with the total power of the plurality of AC/DC sub-modules;
The input ends of the plurality of AC/DC sub-modules are connected with an alternating current power supply, and the output ends of the plurality of AC/DC sub-modules are connected with a direct current bus of the charging pile system;
The input ends of the plurality of DC/DC sub-modules are connected with the direct current bus, and the output ends of the plurality of DC/DC sub-modules are connected with the output end of the charging pile system;
the controller is used for controlling the running states of the plurality of AC/DC sub-modules and the plurality of DC/DC sub-modules according to the charging power demand value of each charging gun;
When the running state of each AC/DC sub-module is controlled, the controller determines the number of the AC/DC sub-modules participating in charging according to the sum of the charging power requirement values and the power of each AC/DC sub-module so as to ensure that the load rate of each AC/DC sub-module is near the highest efficiency point; the number of the AC/DC sub-modules participating in charging is the same as or different from the number of the DC/DC sub-modules participating in charging; the number of the DC/DC sub-modules participating in charging is the sum of the first target number corresponding to each charging gun; the first target number of any charging gun is the number of DC/DC sub-modules with the total power of the DC/DC sub-modules being larger than the charging power requirement value of the charging gun and the value being the smallest.
2. The charging pile system according to claim 1, wherein the output end of each charging pile system is connected to a charging gun.
3. The charging pile system according to claim 2, wherein the number of charging guns is one or at least two;
The number of the DC/DC sub-modules is greater than or equal to the number of the charging guns.
4. A charging pile system according to claim 3, wherein when the number of charging guns is at least two, a control switch is provided between the DC/DC sub-module output and each charging gun;
the controller is also used for controlling the DC/DC sub-modules connected with the charging guns by controlling the on-off state of the control switch so as to adjust the charging power of the at least two charging guns.
5. The charging pile system according to claim 1, further comprising: at least one redundant DC/DC sub-module;
the total power of the at least one redundant DC/DC sub-module and the plurality of DC/DC sub-modules is greater than the total power of the plurality of AC/DC sub-modules;
the at least one redundant DC/DC sub-module is connected in parallel with the plurality of DC/DC sub-modules.
6. The charging pile system according to claim 5, wherein the number of charging guns is at least two;
The output end of each redundant DC/DC sub-module is respectively connected with each charging gun through a control switch;
The controller is also used for controlling the on-off state of the control switch so as to control the charging gun connected with each redundant DC/DC sub-module and adjust the charging power of each charging gun.
7. The charging pile system of claim 5, further comprising at least one redundant AC/DC sub-module, a total power of the at least one redundant AC/DC sub-module and the plurality of AC/DC sub-modules being greater than a total power of the plurality of DC/DC sub-modules.
8. The charging pile system according to claim 7, wherein the controller is further configured to select an AC/DC sub-module that meets the charging power demand and has a short cumulative operating time to participate in the charging operation based on the charging power demand of the charging gun and the operating parameters of the redundant AC/DC sub-module and each of the AC/DC sub-modules.
9. A power distribution control method in a charging pile system, characterized by being applied to the charging pile system according to any one of claims 1 to 8, the method comprising:
Acquiring a charging power demand value of a charging gun;
Determining a target AC/DC sub-module and a target DC/DC sub-module for providing electric energy for the charging gun according to a power distribution strategy according to the charging power requirement value, the power of the single AC/DC sub-module and the power of the single DC/DC sub-module;
and controlling the target AC/DC sub-module and the target DC/DC sub-module to provide electric energy for the charging gun.
10. The method of claim 9, wherein determining a target AC/DC sub-module and a target DC/DC sub-module for providing electrical energy to the charging gun according to a power distribution strategy based on the charging power demand value, the power of the single AC/DC sub-module and the single DC/DC sub-module, comprises:
According to the sum of charging power demand values of all charging guns in the charging pile system and the power of each AC/DC sub-module, determining the minimum number of AC/DC sub-modules with the total power larger than or equal to the sum of the charging power demand values as target AC/DC sub-modules;
And for any charging gun, determining the DC/DC sub-module which meets the charging power requirement value of the charging gun and has the minimum value as the target DC/DC sub-module.
11. The method according to claim 10, wherein the determining, based on the sum of the charging power demand values of each charging gun in the charging pile system and the power of each AC/DC sub-module, the minimum number of AC/DC sub-modules having a total power greater than or equal to the sum of the charging power demand values as the target AC/DC sub-module includes:
Determining a target number with the total power larger than or equal to the sum of the charging power demand values and the minimum value according to the sum of the charging power demand values of all the charging guns and the power of all the AC/DC sub-modules;
And when the target number is smaller than the total number of the AC/DC sub-modules connected with the direct current bus, selecting the target number of the AC/DC sub-modules with short accumulated working time from the AC/DC sub-modules connected with the direct current bus as the target AC/DC sub-modules.
12. The method of claim 10, wherein the determining, for any charging gun, the DC/DC sub-module that meets the charging power requirement value of the charging gun and has the smallest value is a target DC/DC sub-module, comprising:
according to parameters of the DC/DC sub-modules connected with the charging gun, determining a first target number of the DC/DC sub-modules with the total power larger than a charging power requirement value of the charging gun and the minimum value;
And when the first target number is smaller than the total number of the DC/DC sub-modules connected with the charging gun, selecting the first target number of DC/DC sub-modules with short accumulated working time from all the DC/DC sub-modules connected with the charging gun as the target DC/DC sub-modules.
13. The method of claim 10, wherein the charging gun comprises a first charging gun and a second charging gun, and the DC/DC sub-module comprises at least one redundant DC/DC sub-module;
for any charging gun, determining the DC/DC sub-module which meets the charging power requirement value of the charging gun and has the minimum value as the target DC/DC sub-module, and comprising:
Determining a second target number of redundant DC/DC sub-modules required when the charging power demand of the charging gun is greater than the power sum of the DC/DC sub-modules connected to the charging gun;
And controlling the second target number of redundant DC/DC sub-modules to be connected with the charging gun, so that all the DC/DC sub-modules connected with the charging gun and the second target number of redundant DC/DC sub-modules jointly provide electric energy for the charging gun.
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