CN115782667B - Method and system for distributing capacitance for charging pile - Google Patents
Method and system for distributing capacitance for charging pile Download PDFInfo
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- CN115782667B CN115782667B CN202310077602.6A CN202310077602A CN115782667B CN 115782667 B CN115782667 B CN 115782667B CN 202310077602 A CN202310077602 A CN 202310077602A CN 115782667 B CN115782667 B CN 115782667B
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Abstract
The application relates to a charge stack capacitance distribution method and system. The method comprises the following steps: the power supply, the power centralized control module and the N charging stacks; the charging stack comprises a power cabinet and N charging terminals respectively connected with the power cabinet. The power cabinet acquires the total required power of N charging terminals, and reports the total required power to the power centralized control module; the power centralized control module obtains the maximum outputtable total power of the charging pile according to the total required power and the maximum input power of the power supply, and transmits the maximum outputtable total power to the power cabinet; and the power cabinet acquires the maximum outputtable power of each charging terminal according to the maximum outputtable total power and the required power of each charging terminal. The output power of the charging pile is continuously adjusted according to the actual charging condition, so that the maximum input power of the power supply is reasonably distributed, idle power or unreasonable distribution is avoided, the utilization rate of the power supply is improved, and the charging speed of the charging pile is improved.
Description
Technical Field
The application relates to the technical field of charging piles, in particular to a method and a system for distributing capacitance for a charging pile.
Background
At present, the global electric automobile technology is continuously improved, the energy density of an electric automobile battery is continuously improved, the battery capacity is continuously improved, electric automobile users are continuously increased, and the number of charging piles and the output capacity of charging piles of an original charging station can not meet the charging requirements of the electric automobile which are gradually increased. The number of charging piles is small, and the charging speed is slow, so that the charging pile is the most desirable problem for most charging users. The deep reasons are mainly that the cost of the ascending distribution network capacity is too high, a charging operator is in a dilemma of building a charging pile under the limited distribution network capacity, and the output capacity of the charging pile is low on the premise of pursuing the quantity, so that the charging time of a user is greatly prolonged, and the charging experience of the user is influenced; under the circumstance of pursuing the output capacity of the charging pile, the quantity of the built piles is small, the constant-voltage small-current charging stage of the electric automobile in the charging peak period greatly wastes the distribution network resources of the charging station, and other users needing to charge urgently need to wait for the charging potential to be free for charging. The method has the advantages that enough charging piles are built under the limited distribution network capacity, the charging speed is effectively improved, and the charging experience of users is improved, so that the method is a current problem which needs to be solved urgently.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a method and a system for distributing capacity for a charging stack, which are capable of reasonably distributing power to increase a charging speed.
A charge pile capacitance distribution method comprises a power supply, a power centralized control module and N charge piles; the charging stack comprises a power cabinet and N charging terminals respectively connected with the power cabinet; the power cabinet is respectively connected with a power supply and a power centralized control module; the charging terminal is used for connecting a charging object;
the power cabinet acquires the total required power of N charging terminals, and reports the total required power to the power centralized control module;
the power centralized control module obtains the maximum outputtable total power of the charging pile according to the total required power and the maximum input power of the power supply, and transmits the maximum outputtable total power to the power cabinet;
and the power cabinet acquires the maximum outputtable power of each charging terminal according to the maximum outputtable total power and the required power of each charging terminal.
In one embodiment, the step of obtaining the maximum outputtable total power of the charging pile by the power centralized control module according to the total required power and the maximum input power of the power supply includes the steps of:
the power centralized control module obtains the residual capacitance of the power supply according to the total required power and the maximum input power of the power supply;
if the residual capacitance is greater than or equal to zero, the maximum outputtable total power is the total required power;
if the residual capacitance is smaller than zero, calculating the target power of the charging pile according to the preset distribution proportion among the charging piles; the maximum outputtable total power corresponding to the charging pile with the total required power smaller than or equal to the target power is the total required power; the maximum outputtable total power corresponding to the charging stacks with the total required power larger than the target power is larger than or equal to the target power, and the total power is met according to the preset priority among the charging stacks or the order of the total required power.
In one embodiment, the power cabinet comprises a power control module and N rectifying modules connected with the power control module;
the power control module distributes corresponding number of rectifying modules to the charging terminal according to the maximum outputtable power and the power switching granularity capacity, and sets the output power of the corresponding number of rectifying modules as the maximum outputtable power;
the power control module issues a power control instruction to the charging terminal to control the charging terminal to start output power.
In one embodiment, the power cabinet further comprises a power switching module connected with the power control module;
when the required power of the charging terminal is reduced, the power control module selects a target number of rectifying modules from the rectifying modules on the output link of the charging terminal to be closed, and the closed rectifying modules are separated from the output link of the charging terminal through the power switching module, so that the separated rectifying modules are in an idle state;
when the required power of the charging terminal is increased, the power control module detects that the idle power of the charging pile is greater than zero and the rectifier modules in idle states exist, corresponding power and a corresponding number of the rectifier modules in idle states are distributed to the charging terminal according to the power increase value, and the power switching module is informed to add the distributed rectifier modules in idle states into an output link of the charging terminal; the idle power is the difference between the maximum outputtable total power of the charging pile and the actual output total power.
In one embodiment, before allocating the corresponding power and the corresponding number of rectifier modules in idle state to the charging terminal according to the power increase value, the method comprises the steps of:
the power control module controls to reduce the current output power on an output link of the charging terminal, and the power control module controls to increase the output voltage of the rectification module in the distributed idle state to the current bus voltage neighborhood; the current bus voltage neighborhood is centered on the bus voltage of the output link of the charging terminal, with 2 volts being the radius.
In one embodiment, the total actual output power is the sum of the actual output powers reported to the power control module by the charging terminal; or (b)
The power cabinet further comprises a first ammeter connected with the power control module; the actual output total power is acquired by the power control module through the first ammeter.
In one embodiment, the system further comprises a remote control terminal; the remote control terminal is in communication connection with the power centralized control module;
the remote control terminal at least transmits the following data to the power centralized control module: the method comprises the steps of maximum input total power of a power supply, preset distribution proportion of a charging pile and preset priority of the charging pile;
the power centralized control module at least reports the following data to the remote control terminal: the actual total output power of the charging pile and the actual total input power of the power supply system.
In one embodiment, the method further comprises a mobile terminal; the mobile terminal can be in communication connection with the charging terminal;
the mobile terminal sends a charging request instruction to the charging terminal, the charging terminal analyzes the charging request instruction to obtain the required power in the charging request instruction, and the charging terminal reports the required power to the power cabinet;
in the charging process, the charging terminal sends charging data to the mobile terminal.
In one embodiment, the power supply further comprises a second electricity meter; the second ammeter is connected with the power centralized control module;
the second ammeter collects the actual input total power of the power supply and reports the actual input total power to the power centralized control module.
A capacitance distribution system for charging stacks comprises a power supply, a power centralized control module and N charging stacks; the charging stack comprises a power cabinet and N charging terminals respectively connected with the power cabinet; the power cabinet is respectively connected with a power supply and a power centralized control module; the charging terminal is used for connecting a charging object.
One of the above technical solutions has the following advantages and beneficial effects:
in the capacitance distribution method for the charging stack provided by the embodiments of the present application, a power cabinet obtains total required power of N charging terminals, and reports the total required power to a power centralized control module; the power centralized control module obtains the maximum outputtable total power of the charging pile according to the total required power and the maximum input power of the power supply, and transmits the maximum outputtable total power to the power cabinet; and the power cabinet acquires the maximum outputtable power of each charging terminal according to the maximum outputtable total power and the required power of each charging terminal. The maximum outputtable total power is distributed to each charging pile through the total required power of the charging pile and the power supply capacity (maximum input power) of the power supply, the maximum outputtable total power is distributed to the power cabinet in the charging pile, and the maximum outputtable power is distributed to each charging terminal, so that the output power of the charging pile is continuously regulated according to actual charging conditions, the maximum input power of the power supply is reasonably distributed, idle power or unreasonable distribution is avoided, the utilization rate of the power supply is improved, and the charging speed of the charging pile is improved.
Drawings
Fig. 1 is a charging flow chart in the conventional art.
Fig. 2 is a schematic structural diagram of a capacitance distribution method for a charge stack in an embodiment of the present application.
Fig. 3 is a schematic flow chart of a method for distributing capacitance for a charging stack according to an embodiment of the present application.
Fig. 4 is a diagram of a scheduling hierarchy of a method for allocating capacity for a charge stack according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of a capacitance distribution method for a charge stack in an embodiment of the present application.
Fig. 6 is a control flow chart of a method for distributing capacity for a charge stack according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
Traditional integral type fills electric pile power solidification, can not fully satisfy the vehicle that the power demand is greater than fills electric pile rated power and fills, can not adapt to the demand that battery technology developed rapidly. Meanwhile, in order to ensure that the battery is full of electricity, prevent to shorten the service life of the battery and prevent dangerous states during charging, the charging pile requires to implement accurate current and voltage control on the battery in the charging process, and at present, most common charging processes of the automobile battery can be divided into three stages as shown in fig. 1: the power that fills electric pile and occupy in these two stages fills electric pile and can't use, leads to filling electric pile's power and can't obtain rational utilization in advance steady voltage, constant current charge and constant voltage charge, wherein, in steady voltage and constant voltage charge stage in advance, car charging power is generally off-set.
Although the conventional charging pile technology solves the above part of problems to a certain extent, because the rated power of each charging pile is generally larger (more than 300 kW), the capacity of the charging piles under the same power supply is independent from each other, and the charging piles occupy part of the capacity of the whole distribution network no matter whether the charging piles actually consume power or not. Under some common scenes, some charging stacks occupy the distribution capacity, but the part of the capacity is not actually used, but the charging stacks with higher use rate or charging requirement under the same power supply can only use the preset capacity of the charging stacks for the safe operation of the local distribution network, so that the charging speed of the charging terminals under the charging stacks is lower, and the distribution network capacity of the whole power supply is not reasonably distributed and utilized.
In order to solve the above-mentioned problems, in one embodiment, as shown in fig. 2, there is provided a capacitance distribution method for a charging stack 15, including a power supply 11, a power centralized control module 13, and N charging stacks 15. The power supply 11 may be connected to a power grid, and may obtain electric energy from the power grid. The power centralized control module 13 is used to control each of the charging stacks 15. The charging stack 15 includes a power cabinet 151 and N charging terminals 153 connected to the power cabinet 151, respectively, and specifically, the charging terminals 153 are connected to the power cabinet 151 through power lines and communication lines. In one example, the communication line is a CAN (Controller Area Network ) bus. The power cabinet 151 is connected to the power supply 11 and the power centralized control module 13, respectively, and in one example, the power cabinet 151 is connected to the power supply 11 through a power line, and the power cabinet 151 is connected to the power centralized control module 13 through an RS485 or ETH line. The charging terminal 153 is used for connecting with the charging object 19, and charging the charging object 19, and the charging object 19 may be an electric car. It should be noted that the number of the charging stacks 15 is determined by the charging stacks 15 that are actually connected. The power supply 11 is ac-input and ac-output. The power cabinet 151 exchanges input and output, and outputs direct current. The charging terminal 153 is dc-input and dc-output.
During charging, as shown in fig. 3, the capacitance distribution method for the charging stack 15 includes the steps of:
in step S310, the power cabinet 151 obtains the total required power of the N charging terminals 153, and reports the total required power to the power centralized control module 13. The power cabinet 151 obtains the total required power of the charging terminal 153 in real time, or the power cabinet 151 obtains the total required power of the charging terminal 153 periodically (for example, with a period of 1 minute, with a period of 5 minutes, or with a period of 10 minutes). In one example, after the charging terminals 153 are connected to the charging object 19, the BMS (Battery Manage System, battery management system) system of the charging object 19 obtains the BMS charging demand power of the charging object 19, and the total demand power is the sum of the BMS charging demand power reported by the charging terminals 153. In another example, the charging terminals 153 may be communicatively connected to a mobile terminal (e.g., a smart phone), and the user sends a charging request instruction to the charging terminals 153 through the mobile terminal, and sends a required power to the charging terminals 153, where the total required power is the sum of the required powers received by each charging terminal 153 and sent by the user through the mobile terminal.
In one example, the power cabinet 151 may report the total required power to the power centralized control module 13 in real time, or may report the total required power to the power centralized control module 13 periodically (e.g., 1 minute period, 5 minutes period, or 10 minutes period). Meanwhile, the power cabinet 151 also obtains the actual output total power of the N charging terminals 153, and reports the actual output total power to the power centralized control module 13. In one example, the power cabinet 151 may also report the actual total output power to the power centralized control module 13 in real time, or may report the actual total output power to the power centralized control module 13 periodically (e.g., with a period of 1 minute, 5 minutes, or 10 minutes).
In step S320, the power centralized control module 13 obtains the maximum outputtable total power of the charging stack 15 according to the total required power and the maximum input power of the power supply 11, and issues the maximum outputtable total power to the power cabinet 151. The maximum total power that can be output is the maximum power allocated to the charging terminal 153 according to the current power supply capability of the power supply 11. The maximum input power of the power supply 11 is mainly used for protecting the power supply, and when the sum of the maximum outputtable total power of each charging pile 15 exceeds the maximum input power of the power supply 11, the power centralized control module 13 limits the power output of the whole system by reducing the maximum outputtable total power of each charging pile 15 by a certain proportion. The power loss during system operation may result in the sum of the maximum available total power output of each charging stack 15 exceeding the maximum input power of the power supply 11.
Specifically, the step of obtaining the maximum outputtable total power of the charging pile 15 by the power centralized control module 13 according to the total required power and the maximum input power of the power supply 11 includes:
the power centralized control module 13 obtains the residual capacity of the power supply 11 according to the total required power and the maximum input power of the power supply 11; if the residual capacitance is greater than or equal to zero, the maximum outputtable total power is the total required power; if the residual capacitance is smaller than zero, calculating the target power of the charging pile 15 according to the preset distribution proportion among the charging piles 15; the maximum outputtable total power corresponding to the charging pile 15 with the total required power being less than or equal to the target power is the total required power; the maximum total power output of the charging stacks 15 with the total required power greater than the target power is greater than or equal to the target power, and is satisfied in the order of the preset priority or the total required power between the charging stacks 15.
The remaining capacity of the power supply 11 is the difference between the maximum input power of the power supply 11 and the sum of the total required power reported from each power cabinet 151. When the remaining capacity is greater than or equal to zero, it is stated that the current power supply capacity of the power supply 11 can fully satisfy the charging requirements of the N charging stacks 15, for which purpose the maximum total power output of the charging stacks 15 is the total required power. When the residual capacity is smaller than zero, which indicates that the current power supply capacity of the power supply 11 cannot simultaneously meet the charging demands of the N charging stacks 15, the actual input total power of the power supply 11 is divided according to a preset distribution ratio, and corresponding target power is distributed to each charging stack 15. And judging the target power and the total required power of each charging pile 15, and for the charging piles 15 with the total required power smaller than or equal to the target power, indicating that the power distributed to the charging piles 15 can meet the requirement. For the charging stacks 15 with total required power greater than the target power, it is indicated that the power currently allocated to the charging stacks 15 cannot fully meet the requirement, in this case, a maximum total power capable of being output greater than the target power is set for the charging stacks 15, and the charging requirements of the charging stacks 15 are met according to the preset priority among the charging stacks 15 or the order of the total required power, so as to improve the charging efficiency. The order of the total power demand may be from large to small or from small to large. The sum of the maximum total power output of the respective charging stacks 15 cannot exceed the maximum input power of the power supply 11.
In step S330, the power cabinet 151 obtains the maximum outputtable power of each charging terminal 153 according to the maximum outputtable total power and the required power of each charging terminal 153. For example, the distribution is performed in accordance with a preset distribution ratio of each charging terminal 153, and the required power is sequentially satisfied in the order of the required power of the charging terminals 153 from large to small, and is sequentially satisfied in accordance with a preset priority of the charging terminals 153, for example. In one example, the remaining available power of the charge stack 15 may be calculated first based on the maximum total power available to be output by the charge stack 15 issued by the power centralized control module 13, and the power already used in the charge stack 15. And then, according to the reported required power of the charging pile and the residual available power of the charging pile 15, the maximum limited output power of the charging terminal 153 is obtained.
To achieve power output, in one example, as shown in fig. 4, a power cabinet 151 includes a power control module 152 and N rectifying modules 156 connected to the power control module 152. It should be noted that, the power control module 152 is a control center of the power cabinet 151. The rectifying module 156 is used for converting ac to dc.
The power control module 152 allocates a corresponding number of rectifying modules 156 to the charging terminal 153 according to the maximum outputtable power and the power switching granularity capacity, and sets the output power of the corresponding number of rectifying modules 156 to the maximum outputtable power; the power control module 152 issues a power control instruction to the charging terminal 153 to control the charging terminal 153 to start the output power. The power distribution in the charging pile 15 is at a minimum granularity, and even if the residual power of the charging pile 15 is 50 kw, only one rectifier module 156 (rated 30 kw) in an idle state is used, and the maximum output power of the charging pile 15 is only 30 kw.
Specifically, the remaining available power of the charging pile 15 may be calculated according to the maximum outputtable total power of the charging pile 15 issued by the power centralized control module 13 and the used power in the charging pile 15. And then, according to the required power reported by the charging pile and the remaining available power of the charging pile 15, the maximum limiting and outputtable power of the charging terminal 153 is obtained by taking the quantity of the rectifying modules 156 in the idle state in the charging pile 15 and the corresponding maximum outputtable power.
In order to realize dynamic switching of power, the power is reasonably distributed. In one example, as shown in fig. 4, the power cabinet 151 further includes a power switching module 154 coupled to the power control module 152.
When the required power of the charging terminal 153 decreases, the power control module 152 selects a target number of rectifying modules 156 from the rectifying modules 156 on the output link of the charging terminal 153 to be turned off, and disconnects the turned-off rectifying modules 156 from the output link of the charging terminal 153 through the power switching module 154, and the disconnected rectifying modules 156 are in an idle state.
When the required power of the charging terminal 153 increases, the power control module 152 detects that the idle power of the charging pile 15 is greater than zero and the rectifier modules 156 in idle state exist, allocates the corresponding power and the corresponding number of rectifier modules 156 in idle state to the charging terminal 153 according to the power increase value, and notifies the power switching module 154 to add the allocated rectifier modules 156 in idle state to the output link of the charging terminal 153; the idle power is the difference between the maximum total power output of the charging stack 15 and the actual total power output.
To ensure that the rectifying module 156 is securely added in the output link of the charging terminal 153, in one example, before distributing the corresponding power and the corresponding number of rectifying modules 156 in idle state to the charging terminal 153 by the power increase value, the steps are included:
the power control module 152 controls to decrease the current output power on the output link of the charging terminal 153, and the power control module 152 controls to increase the output voltage of the rectification module 156 in the allocated idle state to the current bus voltage neighborhood; the current bus voltage neighborhood is centered on the bus voltage of the output link of the charge terminal 153, with 2 volts being the radius. On the one hand, the current output power on the output link of the charging terminal 153 is temporarily reduced, and on the other hand, the output voltage of the rectifying module 156 is increased, so that the safety in the switching process is ensured.
The following two ways of obtaining the actual output total power are: first, the total actual output power is the sum of the actual output powers reported by the charging terminal 153 to the power control module 152. Second, as shown in fig. 4, the power cabinet 151 further includes a first electric meter 155 connected to the power control module 152, and the actual total output power is acquired by the power control module through the first electric meter 155.
To enable remote monitoring of the charging stack 15, facilitating centralized management of the charging stack 15, in one example, as shown in fig. 5, a remote control terminal 17 is also included; the remote control terminal 17 is in communication with the power focus control module 13. The remote control terminal 17 issues at least the following data to the power centralized control module 13: the maximum total input power of the power supply 11, the preset distribution ratio of the charging stack 15 and the preset priority of the charging stack 15; the power centralized control module 13 reports at least the following data to the remote control terminal 17: the actual total output power of the charging stack 15, the total required power, and the actual total input power of the power supply system. The power central control module 13 may be transmitted with the relevant configuration parameters such as the maximum total power input of the power supply 11, the preset distribution ratio of the charging stack 15, and the preset priority of the charging stack 15 by the remote control terminal 17. Meanwhile, the remote control terminal 17 may display the service condition of each charging pile 15 to related staff, including displaying the actual output total power of the charging pile 15 and the actual input total power of the power supply system, and may also display the total required power of the charging pile 15, the required power of the charging terminal 153, the charging duration of the charging pile 15, and the charging duration of the charging terminal 153.
To facilitate quick ordering by the user, in one example, a mobile terminal is also included, which may be communicatively coupled to the charging terminal 153. It should be noted that, an application program corresponding to the charging terminal 153 is installed on the mobile terminal, the application program is run and communicatively connected with the charging terminal 153, and the charging terminal 153 can be ordered by the application program, and the charging process is displayed in real time. Specifically, the mobile terminal sends a charging request instruction to the charging terminal 153, the charging terminal 153 analyzes the charging request instruction to obtain the required power in the charging request instruction, and the charging terminal 153 reports the required power to the power cabinet 151; during the charging process, the charging terminal 153 transmits charging data to the mobile terminal.
In one example, as shown in fig. 5, the power supply 11 further includes a second electricity meter 111. The second electricity meter 111 is connected to the power centralized control module 13. The second electricity meter 111 collects the actual total input power of the power supply 11, and reports the actual total input power to the power centralized control module 13. The second electricity meter 111 is connected to the input side of the power supply 11.
In the capacitance distribution method for the charging stack 15 provided in each embodiment of the present application, the power cabinet 151 obtains total required power of the N charging terminals 153, and reports the total required power to the power centralized control module 13; the power centralized control module 13 obtains the maximum outputtable total power of the charging pile 15 according to the total required power and the maximum input power of the power supply 11, and transmits the maximum outputtable total power to the power cabinet 151; the power cabinet 151 obtains the maximum outputtable power of each charging terminal 153 according to the maximum outputtable total power and the required power of each charging terminal 153. The maximum outputtable total power is distributed to each charging pile 15 through the total required power of the charging pile 15 and the power supply capacity (maximum input power) of the power supply 11, the maximum outputtable total power is distributed to the power cabinet 151 in the charging pile 15, and the maximum outputtable power is distributed to each charging terminal 153, so that the output power of the charging pile 15 is continuously regulated according to the actual charging condition, the maximum input power of the power supply 11 is distributed reasonably, the idle power or unreasonable distribution is avoided, the utilization rate of the power supply 11 is improved, and the charging speed of the charging pile 15 is improved.
The power centralized control module 13 in this application for the power centralized control module 13 is placed in the middle under the condition of the total dispatch in the middle of the utilization ratio of power supply 11 distribution capacity that will greatly improve to the construction of 15 clusters of charging, can be with the construction of the proportion of 15 total capacity of charging and station distribution capacity 1:1.5, and need not consider the power supply 11 overload condition that probably appears when charging terminal 153 uses simultaneously, and the construction quantity of charging terminal 153 will obtain steadily promoting, can greatly alleviate the difficult problem of electric automobile user charging.
The power sharing of the charging stack 15 under the same power supply can greatly improve the adaptability of the charging terminal 153 to a high-power charging scene, and the charging power is distributed according to the charging requirement sent by the vehicle BMS; along with the improvement of the battery charging multiplying power, the power of the power stack can be expanded to meet the charging requirement due to the increase of the charging power requirement, and the problem of slow charging of the electric automobile can be solved under the scheme.
In one embodiment, as shown in fig. 2 and 5, there is provided a capacitance distribution system for a charging pile 15, including a power supply 11, a power centralized control module 13, and N charging piles 15; the charging stack 15 includes a power cabinet 151 and N charging terminals 153 connected to the power cabinet 151, respectively; the power cabinet 151 is respectively connected with the power supply 11 and the power centralized control module 13; the charging terminal 153 is used to connect to the charging object 19. The capacitance distribution system for the charging pile 15 further includes a remote control terminal 17 connected to the power centralized control module 13 and a mobile terminal connected to the charging terminal 153.
As shown in fig. 6, a control flow of the capacitance distribution system for the charging stack 15 is shown, specifically as follows:
the power cabinet 151 periodically collects or counts the actual output power of the charging pile 15, counts the total required power of the charging pile 15, and reports the total required power to the power centralized control device.
The power centralized control device receives the actual output power and the total required power reported by the charging pile 15, and receives the current maximum outputtable capacity of the power supply 11, the power distribution proportion of the charging pile 15 and the power distribution priority of the charging pile 15 sent by the remote control terminal 17. And periodically collecting the maximum input power of the power supply system, counting the total actual output power of the charging stacks 15, calculating the residual capacity of the power supply system, configuring the maximum output total power of each charging stack 15, and issuing the total output total power to the charging stacks 15. And meanwhile, the power utilization information related to the power supply 11 and the charging pile 15 is reported to the cloud platform.
The remote control terminal 17 can configure the maximum use capacity of the power supply 11, the power distribution proportion and the priority of each charging pile 15 and send the power to the power centralized control device, and meanwhile, information reported by the power centralized control device is displayed on a platform and provided for a user to monitor the whole charging system conveniently.
The charging user clicks on the APP of the mobile terminal to start charging, and the charging instruction will issue the charging terminal 153 corresponding to the charging stack 15.
After receiving the charge starting instruction, the charging terminal 153 first establishes a charging order, and then initiates a charge starting power request to the power cabinet 151 in the charging stack 15.
After receiving the request for starting the charging power of the charging terminal 153, the power cabinet 151 calculates the maximum outputtable power of the charging terminal 153, allocates a rectification module 156 group with minimum power switching granularity to the charging terminal 153, sets the output parameters (i.e. the maximum outputtable power) of the rectification module 156 group, and issues a command to inform the charging terminal 153 that the power output can be started.
After receiving the power output instruction of the power cabinet 151, the charging terminal 153 starts a charging process, controls power output, and reports power output information to the APP of the mobile terminal.
In the power output process of the charging terminal 153, the charging demand power is periodically reported to the power cabinet 151, and the power control module 152 in the power cabinet 151 calculates the maximum output rate of the charging terminal 153 in real time according to the demand power of the charging terminal 153 and the maximum outputtable total power of the charging pile 15, and dynamically distributes the rectifying module 156 and adjusts the power output for the charging terminal 153.
When the power required by the charging terminal 153 becomes smaller, on the premise that the charging terminal 153 still can meet the charging requirement after releasing the target number of rectifying modules 156, the power control module 152 in the power cabinet 151 selects the target number of rectifying modules 156 from the rectifying module 156 combination in the output link of the charging terminal 153 and closes the output, and notifies the power switching module 154 to disengage the closed rectifying modules 156 from the output link of the charging terminal 153, so that the rectifying module 156 group separated from the output link of the charging terminal 153 is in an idle state.
When the power required by the charging terminal 153 becomes larger, the charging terminal 153 needs to increase the target number of rectifying modules 156 to meet the charging requirement, and the power control module 152 in the power cabinet 151 detects whether there is idle power (a difference between the maximum exportable total power of the charging pile 15 and the actual output total power of the charging pile 15) and idle rectifying modules 156 (the rectifying modules 156 not in any power output link), and distributes the idle rectifying modules 156 and idle power to the current charging pile as much as possible to meet the current charging power requirement.
Before the rectifying modules 156 are added to the power link in the charging output process of the charging terminal 153, the output power of the current link needs to be reduced as much as possible in advance, and the output voltage of the rectifying modules 156, which needs to be increased, is boosted to the bus voltage on the current power link. When the voltage difference between the output voltage of the target number of rectifying modules 156 and the bus voltage on the output link of the charging terminal 153 is controlled within ±2v, the power control module 152 in the power cabinet 151 notifies the power switching module 154 to add the target number of modules to the power output link of the current charging terminal 153.
It should be understood that, although the steps in the flowchart of fig. 3 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 3 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the sub-steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of the sub-steps or stages of other steps or other steps.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (9)
1. The method for distributing the capacitance for the charging stacks is characterized by comprising a power supply, a power centralized control module and N charging stacks; the charging pile comprises a power cabinet and N charging terminals respectively connected with the power cabinet; the power cabinet is respectively connected with the power supply and the power centralized control module; the charging terminal is used for connecting a charging object;
the power cabinet acquires the total required power of N charging terminals, and reports the total required power to the power centralized control module;
the power centralized control module obtains the maximum outputtable total power of the charging pile according to the total required power and the maximum input power of the power supply, and transmits the maximum outputtable total power to the power cabinet;
the power cabinet obtains the maximum outputtable power of each charging terminal according to the maximum outputtable total power and the required power of each charging terminal;
the step of obtaining the maximum outputtable total power of the charging pile by the power centralized control module according to the total required power and the maximum input power of the power supply comprises the following steps:
the power centralized control module obtains the residual capacitance of the power supply according to the total required power and the maximum input power of the power supply;
if the residual capacitance is greater than or equal to zero, the maximum outputtable total power is the total required power;
if the residual capacitance is smaller than zero, calculating the target power of the charging pile according to the preset distribution proportion among the charging piles; the maximum outputtable total power corresponding to the charging pile with the total required power being smaller than or equal to the target power is the total required power; the maximum outputtable total power corresponding to the charging stacks with the total required power being greater than the target power is greater than or equal to the target power, and the total power is met according to the preset priority among the charging stacks or the order of the total required power.
2. The method of claim 1, wherein the power cabinet includes a power control module and N rectifying modules connected to the power control module;
the power control module distributes corresponding numbers of rectifying modules to the charging terminal according to the maximum outputtable power and the power switching granularity capacity, and sets the output power of the corresponding numbers of rectifying modules as the maximum outputtable power;
and the power control module issues a power control instruction to the charging terminal to control the charging terminal to start output power.
3. The method of claim 2, wherein the power cabinet further comprises a power switching module connected to the power control module;
when the required power of the charging terminal is reduced, the power control module selects a target number of rectifying modules from the rectifying modules on an output link of the charging terminal to close, and the closed rectifying modules are separated from the output link of the charging terminal through the power switching module, and the separated rectifying modules are in an idle state;
when the required power of the charging terminal is increased, the power control module detects that the idle power of the charging pile is greater than zero and the rectifier modules in idle states exist, distributes corresponding power and the corresponding number of the rectifier modules in idle states to the charging terminal according to a power increase value, and notifies the power switching module to add the distributed rectifier modules in idle states to an output link of the charging terminal; and the idle power is the difference value between the maximum outputtable total power and the actual output total power of the charging pile.
4. A method of allocating charge stack capacity according to claim 3, comprising the steps of, before said allocating a corresponding power and a corresponding number of said rectifier modules in idle state to said charge terminals according to said power increase value:
the power control module controls to reduce the current output power on an output link of the charging terminal, and the power control module controls to increase the output voltage of the rectification module in the distributed idle state to a current bus voltage neighborhood; the current bus voltage neighborhood takes the bus voltage of the output link of the charging terminal as a center and 2V as a radius.
5. The method for allocating charge capacity according to claim 3, wherein the total actual output power is a sum of actual output powers reported to the power control module by the charging terminal; or (b)
The power cabinet further comprises a first ammeter connected with the power control module; the actual total output power is acquired by the power control module through the first ammeter.
6. The method for distributing capacity for a charge stack according to any one of claims 1 to 5, further comprising a remote control terminal; the remote control terminal is in communication connection with the power centralized control module;
the remote control terminal at least transmits the following data to the power centralized control module: the maximum input total power of the power supply, the preset distribution proportion of the charging pile and the preset priority of the charging pile;
the power centralized control module at least reports the following data to the remote control terminal: the actual total output power of the charging pile and the actual total input power of the power supply system.
7. The method for allocating charge capacity according to claim 6, further comprising a mobile terminal; the mobile terminal can be in communication connection with the charging terminal;
the mobile terminal sends a charging request instruction to the charging terminal, the charging terminal analyzes the charging request instruction to obtain the required power in the charging request instruction, and the charging terminal reports the required power to the power cabinet;
and in the charging process, the charging terminal sends charging data to the mobile terminal.
8. The method of claim 7, wherein the power supply further comprises a second electricity meter; the second ammeter is connected with the power centralized control module;
and the second ammeter acquires the actual input total power of the power supply and reports the actual input total power to the power centralized control module.
9. The capacitance distribution system for the charging stacks is characterized by comprising a power supply, a power centralized control module and N charging stacks; the charging pile comprises a power cabinet and N charging terminals respectively connected with the power cabinet; the power cabinet is respectively connected with the power supply and the power centralized control module; the charging terminal is used for being connected with a charging object.
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