Power distribution method and system for high-power charging cluster

Abstract

The invention relates to a power distribution method and system for a high-power charging cluster, and belongs to the technical field of charging control, and the method comprises the steps: obtaining the required power of a charged object and the states of two confluence switches connected with a target charging module which provides power for the charged object through a charging terminal; when the required power of the charged object is greater than the set power of the target charging module, judging the use states of two charging modules adjacent to the target charging module through the states of two confluence switches connected with the target charging module; two idle charging modules adjacent to the target charging module provide complementation power for the charged object; and the conflux switch is arranged between two adjacent charging modules on the direct current bus. The use conditions of the two charging terminals adjacent to the target charging terminal are judged by reading the state of the confluence switch, and the charging terminals are put into use when being idle, so that the utilization rate of the charging module is improved by using a simple algorithm.

Description

Technical Field

[0001] The present invention relates to a power distribution method and system for a high-power charging cluster, belonging to the technical field of charging control. Background Art

[0002] A high-power charging cluster is a system that centralizes charging modules and conducts unified management and control. It can charge different models of vehicles by configuring multiple charging terminals. Charging efficiency directly affects the user experience of charging. However, the current charging stack still has a low utilization rate of charging modules. Therefore, how to improve charging efficiency and utilization rate of charging modules is an urgent problem to be solved.

[0003] The Chinese invention patent application publication with publication number CN118928126A discloses a charging power control method for a charging stack. The method allocates initial charging power to charging terminals based on power allocation information and grid load data according to allocation ratio information, receives battery parameters and charging requirements of vehicles corresponding to each charging terminal, and determines the expected charging power of each charging terminal according to the charging requirements and battery parameters; determines a target charging terminal among the charging terminals, and calculates the charging power compensation amount of the target charging terminal in combination with the grid load data, the initial charging power of the target charging terminal, and the expected charging power of the target charging terminal; and adjusts the charging power of the target charging terminal based on the charging power compensation amount.

[0004] Although this solution improves the utilization rate and charging efficiency of the charging stack, the algorithm is complex and has high requirements for hardware such as chips. Summary of the invention

[0005] The purpose of the present invention is to provide a power distribution method and system for a high-power charging cluster, so as to solve the problem of complex algorithms when improving the utilization rate of charging modules.

[0006] To achieve the above object, the solution of the present invention includes:

[0007] A power distribution method for a high-power charging cluster of the present invention includes: obtaining the required power of a charged object and the state of two bus switches connected to a target charging module that provides power to the charged object through a charging terminal; when the required power of the charged object is greater than the predetermined power of the target charging module, judging the use state of two charging modules adjacent to the target charging module by the state of the two bus switches connected to the target charging module; two idle charging modules adjacent to the target charging module provide supplementary power to the charged object; and the bus switch is arranged between two adjacent charging modules on a DC bus.

[0008] Further, the supplementary power is calculated as follows:

[0009] When i=1,

[0010] When i≠1, Among them, i represents the charging module with serial number i, α (i) Indicates the state of the busbar switch on the right side of the charging module with serial number i, P S(i) is the set power of the charging module with serial number i.

[0011] Furthermore, when the required power of the charged object is not greater than the predetermined power of the charging module of the charging target, only the charging module directly connected to the charging terminal connected to the charged object outputs power.

[0012] Further, after the power distribution is completed, it is determined whether the charging of the charged object is completed. If not completed, the power is reallocated according to the required power of the charged object at the next moment and the state of the bus switch at the next moment.

[0013] A high-power charging cluster system includes a processor, wherein the processor executes a computer program to implement the following steps:

[0014] The power demand of the charged object and the status of two bus switches connected to the target charging module that provides power to the charged object through the charging terminal are obtained; when the power demand of the charged object is greater than the set power of the target charging module, the use status of the two charging modules adjacent to the target charging module is judged by the status of the two bus switches connected to the target charging module; the two idle charging modules adjacent to the target charging module provide supplementary power for the charged object; the bus switch is arranged between two adjacent charging modules on the DC bus.

[0015] Further, the supplementary power is calculated as follows:

[0016] When i=1,

[0017] When i≠1, Among them, i represents the charging module with serial number i, α (i) Indicates the state of the busbar switch on the right side of the charging module with serial number i, P s(i) is the set power of the charging module with serial number i.

[0018] Furthermore, when the required power of the charged object is not greater than the predetermined power of the charging module of the charging target, only the charging module connected to the charged object through the charging terminal outputs power.

[0019] Further, after the power distribution is completed, it is determined whether the charging of the charged object is completed. If not completed, the power is reallocated according to the required power of the charged object at the next moment and the state of the bus switch at the next moment.

[0020] The beneficial effects of the present invention are as follows: the required power of the charged object is read and compared with the set power of the charging module itself corresponding to the current charging gun. If the required power is greater than the set power, the usage of the two charging terminals adjacent to the target charging terminal is judged by reading the state of the bus switch, and they are put into use when they are idle, and together with the target charging terminal, they provide power for the charged object connected to the charging terminal, thereby improving the utilization rate of the charging module with a simple algorithm. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flow chart of a power allocation method for a high-power charging cluster provided by the present invention;

[0022] Figure 2 It is a schematic diagram of the circuit principle of a high-power charging cluster provided by the present invention;

[0023] Figure 3 This is a schematic diagram illustrating a first use case of a power allocation method for a high-power charging cluster provided by the present invention;

[0024] Figure 4 This is a schematic diagram illustrating a second use case of a power allocation method for a high-power charging cluster provided by the present invention;

[0025] Figure 5 This is a schematic diagram illustrating a third use case of a power allocation method for a high-power charging cluster provided by the present invention;

[0026] Figure 6 This is a schematic diagram illustrating a fourth usage scenario of a power distribution method for a high-power charging cluster provided by the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail in a clear and complete manner in conjunction with the accompanying drawings and embodiments.

[0028] The idea of ​​the present invention is to read the required power of the charged object and compare it with the set power of the charging module corresponding to the current charging gun. If the required power is greater than the set power, the use status of the adjacent charging module is judged according to the status of the bus switches on both sides of the corresponding charging module. When the adjacent charging module is idle, the corresponding bus switch is closed to provide greater charging power.

[0029] Method Example:

[0030] The circuit principle of the charging system (large-scale charging cluster) to which the method of the present invention is applicable is as follows: Figure 2 As shown, it is assumed that there are N charging terminals (such as charging guns) for connecting to charged objects, and N charging modules corresponding to the charging terminals one by one. The charging module is essentially a rectifier module with a predetermined power that converts AC mains power into DC power; it also includes a DC bus, and the N charging modules are all connected to the DC bus and to the corresponding charging terminals. On the DC bus, a bus switch is provided between two adjacent charging modules for enabling the adjacent charging modules to supply power to the same charging terminal to increase the output power of a single charging terminal.

[0031] When the power required by the charged object is less than the established power of a charging module, only the corresponding charging module (the charging module corresponding to the charging terminal connected to the charged object) outputs power, that is, only the charging module directly connected to the charging terminal connected to the charged object outputs power; if the power required by the charged object is greater than the established power of a charging module and the adjacent charging module is idle, the corresponding bus switch is closed, and the power is output jointly by connecting the charging module corresponding to the charging terminal of the charged object and the idle charging module adjacent to it.

[0032] When any charging module outputs power, the bus switches on both sides thereof (i.e., the bus switches between the charging modules adjacent thereto) are closed to make the best use of the working charging modules to balance the voltage stability of the corresponding section on the DC bus.

[0033] The specific implementation steps include:

[0034] like Figure 1 What is shown is a flow chart of a power allocation algorithm for a high-power charging cluster provided by an embodiment of the present invention.

[0035] Step 1: The controller reads the required power P of the object being charged. X(i) and the predetermined power P of the corresponding charging module connected to the charged object through the charging terminal S(i) (i=1, 2, ..., N-1, N). In this embodiment, it is assumed that the predetermined powers of the N charging modules are the same and are P S(i) .

[0036] The specified power is the minimum power that the charging module can output stably and safely. It can ensure that the charging module maintains stable power output during the charging process and avoid problems such as charging failure caused by too low output power.

[0037] The power demand refers to the actual electrical power required by the object being charged during the charging process of the charging terminal. It depends on multiple factors, including the current state of the battery of the object being charged (such as power, temperature, etc.), the charging strategy (such as fast charging, slow charging, constant voltage charging, constant current charging, etc.), and the grid conditions (such as voltage, current, frequency, etc.). During the charging process, the object being charged will intelligently adjust its power demand according to the changes in these factors. For example, when the battery power is low, the object being charged may be charged at a higher power to quickly replenish the power; when the battery is close to full power, in order to protect the battery and avoid overcharging, the object being charged will automatically reduce the power demand.

[0038] That is, the given power P S(i) Determined by the charging module itself, the required power P X(i) It is determined by the object to which the charging terminal is connected; specifically, when a car comes to charge, the charging module itself has a set power P S(i) , the object being charged will request a charging power equal to the required power P X(i) , the controller obtains the set power P of the charging module S(i) and the required power P requested by the charging object X(i) , as the subsequent comparison demand power P X(i) With the given power P S(i) basis.

[0039] Step 2: Determine the power distribution mode of the charging terminal by judging the relationship between the power demand of the charged object and the power set by the charging module. X(i) Is it greater than the specified power P of the charging module? S(i) , that is, to judge P X(i) >P S(i) Is it established? If not, proceed to step three to allocate power to the charging terminal according to solution one; if established, proceed to step four to allocate power to the charging terminal according to solution two.

[0040] Step 3: Determine the final power allocation of the charging terminal according to Scheme 1. Specifically, due to the power demand P of the charged object X(i) Less than the specified power P of the charging module S(i) , then the charging module corresponding to the charging terminal itself has a predetermined power P S(i) Able to meet the power demand P of the charged object X(i) That is, the final allocated power of the charging terminal is the predetermined power P of the charging module corresponding to the charging terminal. S(i) , that is, P P(i) =P S(i) After the allocation is completed, go to step 6 to determine whether the charging is completed.

[0041] Step 4: Based on the states of the bus switches on both sides of the target charging module, the usage of the two charging modules adjacent to the target charging module is determined. Specifically, since the charging modules in this embodiment are connected end to end to form a ring structure, if the charging terminal with serial number i (i≠1) is connected to the charged object, the controller reads the bus switch α between the corresponding charging module and the adjacent charging module. (i) and α (i-1) (In this embodiment, the bus switch between the charging terminal numbered 1 and the charging terminal numbered 2 is the first bus switch, i.e., the α bus switch numbered 1. (1) ; that is, α (i) Indicates the state of the bus switch on the right side of the charging module with serial number i), and judges the usage of the two charging modules adjacent to the charging module with serial number i according to the state of the bus switch, that is, judges the usage of the charging modules with serial numbers (i+1) and (i-1). (i) =0 means that the charging module with serial number (i+1) adjacent to the charging terminal with serial number i is in use. (i) =1 indicates that the charging module with serial number (i+1) adjacent to the charging terminal with serial number i is idle; similarly, if α (i-1) = 0 means that the charging module with serial number (i-1) adjacent to the charging terminal with serial number i is in use. (i-1) =1 indicates that the charging module with serial number (i-1) adjacent to the charging terminal with serial number i is idle. If the charging terminal with serial number i (i=1) is connected to the charged object, the controller reads the current bus switch α between the adjacent charging modules. (i) and α (N) The state of the bus switch is used to determine the usage of the two charging modules adjacent to the charging module with sequence number i, that is, to determine the usage of the charging modules with sequence number (i+1) and sequence number N. (i) =0 means that the charging module with serial number (i+1) adjacent to the charging terminal with serial number i is in use. (i) =1 indicates that the charging module with serial number (i+1) adjacent to the charging terminal with serial number i is idle; similarly, if α (N) = 0 means that the charging module with serial number N adjacent to the charging terminal with serial number i is in use. (N) =1 indicates that the charging module with serial number N adjacent to the charging terminal with serial number i is idle.

[0042] Step 5: Determine the charging terminal's supplementary power and final allocated power. Specifically, the final allocated power of the charging terminal is P P(i) =P S(i) +P L(i) , P S(i)is the established power of the charging module connected to the charging terminal, P L(i) It is the power that can be supplemented to the charging terminal by two charging terminals adjacent to the charging terminal in addition to the established power of the charging module connected to the charging terminal, i.e., the supplementary power. The specific calculation method is:

[0043] When i=1,

[0044] When i≠1,

[0045] in, Round down, Represents the largest integer not greater than X, for example

[0046] When i=1, the controller first obtains the status of the converging switches with serial numbers (i+1) and N to determine the usage of the two charging modules adjacent to i. If α (i) = 0 and α (N) = 0, indicating that the two charging modules adjacent to i are in use. (i) = 0 and α (N) =0 Substitute into formula (1) and round to the integer to get P L(i) =0, that is, the two charging modules adjacent to i do not supplement power to the charging module with sequence number i; if α (i) =1 and α (N) = 0, indicating that the charging module with the serial number (i+1) adjacent to i is idle and the charging module with the serial number N is in use. (i) =1 and α (N) =0 Substitute into formula (1) and round to the integer to get P L(i) =P S(i) , that is, the charging module with the sequence number N adjacent to i does not supplement the power of the charging module with the sequence number i, and the charging module with the sequence number (i+1) adjacent to i supplements its own predetermined power to the charging module with the sequence number i; if α (i) =1 and α (N) =1, indicating that the two charging modules adjacent to i are both idle. (i) =1 and α (N) =1 Substitute into formula (1) and round to the integer to get P L(i) =2P S(i) , that is, the two charging modules adjacent to i will set their own power P S(i) Replenishes the charging module with serial number i.

[0047] When i≠1, substitute into formula (2) for calculation. The calculation process is the same as that when i=1, and will not be described in detail.

[0048] Step 6: Determine whether the terminal has finished charging. If charging has not finished, return to step 1 in embodiment 1 and execute the process of embodiment 1 again; if charging has finished, stop charging.

[0049] The following takes 4 charging terminals, 4 charging modules, and 4 bus switches as an example, and takes the charging terminal 2 and the charging module 2 as the discussion objects to explain in detail steps 3, 4, and 5 of the above embodiment:

[0050] If the power demand of the object to be charged connected to the charging terminal 2 is not greater than the preset power P of the charging module 2 S(i) , then the charging terminal 2 is only powered by the charging module 2, that is, the final output power of the charging terminal 2 is the predetermined power P of the charging module 2. S(i) .

[0051] If the power demand of the object to be charged connected to the charging terminal 2 is greater than the preset power P of the charging module 2 S(i) , it is necessary to first determine whether the charging module 1 and the charging module 3 are in use through the state of the bus switch, and whether they can provide supplementary power for the charging terminal 2.

[0052] Case 1: Both charging module 1 and charging module 3 are idle. The bus switch is as follows: Figure 3 As shown, charging module 1 is idle, and the bus switches S1 and S4 are disconnected; charging module 3 is idle, and the bus switches S2 and S3 are disconnected.

[0053] When judging whether charging module 1 and charging module 3 can provide supplementary power for the charging terminal, the controller reads the status of S1 and S2. If both S1 and S2 are disconnected, then α (1) =1,α (2) =1 indicates that charging module 1 and charging module 3 are idle and can provide supplementary power for charging terminal 2. At this time, the supplementary power can be calculated by formula (2) to be 2P S(i) , that is, in addition to the charging module 2 connected to the charging terminal 2 itself, the idle charging module 1 and the charging module 3 have a predetermined power P S(i) are also transmitted to charging terminal 2, so the final output power of charging terminal 2 is P P(i) =P S(i) +2P S(i) =3P S(i) .

[0054] Case 2: Charging module 1 is in use, and charging module 3 is idle. The situation of the bus switch at this time is as follows: Figure 4 As shown, charging module 1 is in use, and bus switches S1 and S4 are closed; charging module 3 is idle, and bus switches S2 and S3 are open.

[0055] When judging whether charging module 1 and charging module 3 can provide supplementary power for the charging terminal, the controller reads the status of S1 and S2. If S1 is closed and S2 is open, then α (1) =0,α (2) =1, indicating that charging module 1 is in use and charging module 3 is idle. Charging module 3 can provide supplementary power for charging terminal 2. At this time, the supplementary power can be calculated by formula (2) as P S(i) , that is, in addition to the charging module 2 connected to the charging terminal 2 itself, the predetermined power P of the idle charging module 3 is S(i) is also transmitted to charging terminal 2, so the final output power of charging terminal 2 is P P(i) =P S(i) +2P S(i) =2P S(i) .

[0056] Case 3: Charging module 1 is idle, and charging module 3 is in use. The situation of the busbar switch at this time is as follows: Figure 5 As shown, charging module 1 is idle, and bus switches S1 and S4 are disconnected; charging module 3 is in use, and bus switches S2 and S3 are closed.

[0057] When judging whether charging module 1 and charging module 3 can provide supplementary power for the charging terminal, the controller reads the status of S1 and S2. If S1 is disconnected and S2 is closed, then α (1) =1,α (2) =0, indicating that charging module 1 is idle and charging module 3 is in use. Charging module 1 can provide supplementary power for charging terminal 2. At this time, the supplementary power can be calculated by formula (2) as P S(i) , that is, in addition to the charging module 2 connected to the charging terminal 2 itself, the predetermined power P of the idle charging module 1 S(i) is also transmitted to charging terminal 2, so the final output power of charging terminal 2 is P P(i) =P S(i) +2P S(i) =2P S(i) .

[0058] Case 4: Both charging module 1 and charging module 3 are in use. The current merge switch is as follows: Figure 6 When charging module 1 is in use, the bus switches S1 and S4 are closed; when charging module 3 is in use, the bus switches S2 and S3 are closed.

[0059] When judging whether charging module 1 and charging module 3 can provide supplementary power for the charging terminal, the controller reads the status of S1 and S2. If both S1 and S2 are closed, then α (1) =0,α (2)=0, indicating that charging module 1 and charging module 3 are in use and cannot provide supplementary power for charging terminal 2. At this time, the supplementary power calculated by formula (2) is 0, that is, the output power of charging terminal 2 is only the predetermined power P of the charging module 2 to which it is connected. S(i) , that is, the final output power P of charging terminal 2 P(i) =P S(i) .

[0060] System Example:

[0061] A high-power charging cluster system includes a processor, a charging terminal, a charging module, and a convergence switch. In order to solve the problem of complex algorithms when improving the utilization rate of the charging module, the high-power charging cluster system of this embodiment executes the power allocation method as described in the method embodiment. The power allocation method has been clearly described in the method embodiment and will not be repeated here.

Claims

1. A power distribution method for a high-power charging cluster, characterized in that: include: Acquire the required power of the charged object and the state of two bus switches connected to the target charging module that provides power to the charged object through the charging terminal; When the required power of the charged object is greater than the set power of the target charging module, the usage status of the two charging modules adjacent to the target charging module is judged by the status of the two bus switches connected to the target charging module; the two idle charging modules adjacent to the target charging module provide supplementary power for the charged object; the bus switch is arranged between two adjacent charging modules on the DC bus.

2. The power distribution method of a high-power charging cluster according to claim 1, characterized in that: The supplementary power is calculated as follows: When i=1, When i≠1, Among them, i represents the charging module with serial number i, α (i) Indicates the state of the busbar switch on the right side of the charging module with serial number i, P S(i) is the set power of the charging module with serial number i.

3. The power distribution method of a high-power charging cluster according to claim 1, characterized in that: When the required power of the charged object is not greater than the predetermined power of the target charging module, only the charging module directly connected to the charging terminal connected to the charged object outputs power.

4. The power distribution method of a high-power charging cluster according to claim 3, characterized in that: After the power distribution is completed, it is determined whether the charging of the charged object is completed. If not completed, the power is reallocated according to the required power of the charged object at the next moment and the state of the bus switch at the next moment.

5. A high-power charging cluster system, comprising a processor, characterized in that: The processor executes the computer program to implement the following steps: The power demand of the charged object and the status of two bus switches connected to the target charging module that provides power to the charged object through the charging terminal are obtained; when the power demand of the charged object is greater than the set power of the target charging module, the use status of the two charging modules adjacent to the target charging module is judged by the status of the two bus switches connected to the target charging module; the two idle charging modules adjacent to the target charging module provide supplementary power for the charged object; the bus switch is arranged between two adjacent charging modules on the DC bus.

6. The high-power charging cluster system according to claim 5, characterized in that: The supplementary power is calculated as follows: When i=1, When i≠1, Among them, i represents the charging module with serial number i, α (i) Indicates the state of the busbar switch on the right side of the charging module with serial number i, P S(i) is the set power of the charging module with serial number i.

7. The high-power charging cluster system according to claim 5, characterized in that: When the power demand of the charged object is not greater than the predetermined power of the target charging module, only the charging module connected to the charged object through the charging terminal outputs power.

8. The high-power charging cluster system according to claim 6, characterized in that: After the power distribution is completed, it is determined whether the charging of the charged object is completed. If not completed, the power is reallocated according to the required power of the charged object at the next moment and the state of the bus switch at the next moment.

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