A semi-matrix unit and a charging pile scheduling system and scheduling method composed of the same

Abstract

The present invention discloses a charging pile scheduling system and scheduling method composed of a semi-matrix unit and the components thereof, and relates to the technical field related to electric vehicle charging scheduling. The technical problem to be solved by the present invention is that the current charging pile uses a large number of switch devices, has poor scalability, and the scheduling method is too complicated. The technical solution of the present invention is: very few switch devices can be used in the semi-matrix unit, and when any charging module is scheduled to any charging node, the modular structure of the charging pile scheduling system can enable the semi-matrix units to be interconnected through a branch structure, a ring structure, and a mesh structure, and can support the semi-matrix unit to be used as a charging semi-matrix unit or a power supplement semi-matrix unit, and the charging pile scheduling method has relatively simple steps. The present invention can reduce the use of switching devices, has strong scalability, and has the technical effect of a simple scheduling method.

Description

Technical Field

[0001] The present invention relates to the technical field related to electric vehicle charging scheduling, and in particular to a semi-matrix unit and a charging pile scheduling system and a scheduling method composed of the semi-matrix unit. Background Art

[0002] The popularity of electric vehicles has led to a rapid increase in demand for charging facilities. As an important charging facility, the scheduling and power allocation of charging piles are crucial to improving charging efficiency and meeting user needs. However, the power allocation and scheduling of charging piles are restricted by multiple factors, such as the number of charging piles and power limits. Current charging piles use many switching devices, have poor scalability, and have overly complex scheduling methods.

[0003] According to these requirements, a charging stack scheduling system with a simple scheduling algorithm is needed, which can easily expand its components, that is, expand the charging units, use as few switching devices as possible, and reduce the configuration complexity of the switching devices. Summary of the invention

[0004] In view of the above-mentioned defects, the present invention provides a charging stack scheduling system and scheduling method composed of a half-matrix unit and the like, which can reduce the use of switching devices, has strong scalability, and a simple scheduling method.

[0005] In order to achieve the purpose of the present invention, the following technologies are proposed:

[0006] A semi-matrix unit, comprising:

[0007] a charging modules are arranged in sequence, a≥2;

[0008] There are a charging nodes arranged in sequence, the i-th charging module and the i-th charging node are directly connected via a cable, 1≤i≤a, and when the charging node is connected to the gun end of the charging gun, a load switch is provided between the charging node and the gun end;

[0009] a*(a-1) / 2 dispatching switches, respectively set between the i-th charging module and the j-th charging node, 1≤i≤a, 1≤j≤a, i≠j;

[0010] There are n expansion node groups, each expansion node group includes a expansion nodes arranged in sequence, and the i-th expansion node is also connected to the i-th charging node through an expansion switch, 1≤i≤a.

[0011] A charging stack scheduling system includes b half-matrix units, and:

[0012] In the system, the value of a is the same for all half-matrix units;

[0013] The charging nodes of some or all of the semi-matrix units are connected to the gun end through a load switch, and the semi-matrix units whose charging nodes are connected to the gun end through a load switch serve as charging semi-matrix units. The charging nodes of some semi-matrix units are not connected to the gun end, and the semi-matrix units whose charging nodes are not connected to the gun end serve as power supplement semi-matrix units. The charging stack scheduling system includes at least one charging semi-matrix unit.

[0014] Each half-matrix unit is connected to at least one half-matrix unit, any two connected half-matrix units are connected through an extended node group, each pair of extended nodes with the same serial number in two connected extended node groups of the connected half-matrix units are connected in pairs, and there is one and only one extended switch between the two connected extended nodes.

[0015] Furthermore, in the charging stack scheduling system, the connection structure of the semi-matrix unit includes a branch structure, a ring structure, and a mesh structure.

[0016] Furthermore, when the semi-matrix unit connection structure of the charging pile scheduling system adopts a branch-trunk structure:

[0017] The charging pile dispatching system includes a main line and multiple branch lines, each branch line includes a number of semi-matrix units arranged in sequence;

[0018] The first extended node group of the first half-matrix unit of each branch line is connected to the main line through a cable, and for the first extended node group of the first half-matrix unit of each branch line, all extended nodes with the same serial number are connected;

[0019] In each branch line having at least two half-matrix units, the i-th charging node of the first half-matrix unit in adjacent half-matrix units is respectively connected to the i-th extended node of the first extended node group of the second half-matrix unit, 1≤i≤a.

[0020] Furthermore, when the half-matrix unit connection structure of the charging pile scheduling system adopts a ring structure, each half-matrix unit is connected in series to form a single closed loop, and:

[0021] Between each two adjacent half-matrix units, the i-th charging node of the first half-matrix unit is respectively connected to the i-th extended node of the first extended node group of the second half-matrix unit, 1≤i≤a.

[0022] Furthermore, when n≥2, and each branch line has at least two half-matrix units, the connection structure of the half-matrix units is expanded from a branch structure to a mesh structure by connecting the half-matrix units in the same order position on each branch line to each other, and the half-matrix units across different branches are connected through the xth expansion node group, 2≤x≤n.

[0023] Furthermore, when the total charging power of the system needs to be expanded, a plurality of power supplementary half-matrix units are newly connected between any two half-matrix units each having an idle expansion node group.

[0024] A charging pile scheduling method, using a charging pile scheduling system, includes the following steps:

[0025] S100: The charging stack scheduling system monitors all charging half-matrix units in real time, and counts and numbers the charging half-matrix units currently connected to the gun ends, where the total number of charging half-matrix units connected to the gun ends is c;

[0026] S200: First, determine whether the total number of charging modules required by all charging requests received by the entire system is greater than the total number of charging modules in the charging pile scheduling system. If not, execute S300. If yes, feedback an error message that the charging demand cannot be met, and suspend charging.

[0027] S300: set d=1;

[0028] S400: performing charging scheduling in sequence to each gun end in the dth charging half-matrix unit to which the gun end is connected;

[0029] S500: Determine whether d=c. If so, complete the charging scheduling. If not, set d=d+1, and then return to S400.

[0030] Further, S400 includes the following steps:

[0031] S410: Set e=1;

[0032] S420: Determine whether the e-th charging node is connected to the gun end. If so, execute S430. If not, set e=e+1, and then execute S420 again.

[0033] S430: performing charging scheduling on the e-th charging node in the half-matrix unit described in S400, including:

[0034] S431: Determine whether the e-th charging module is idle. If so, in the half-matrix unit described in S430, disconnect all the scheduling switches connected to the e-th charging module, turn on the load switch between the e-th charging node and its corresponding gun end, so that the e-th charging module charges the e-th charging node, and then execute S432. If not, directly execute S432;

[0035] S432: Determine whether the number of charging modules charging the e-th charging node is the same as the requested number. If so, S430 ends and S440 is executed. If not, S433 is executed.

[0036] S433: set f=1;

[0037] S434: Determine whether the fth charging module excluding the eth charging module in the half-matrix unit is idle. If so, turn on the scheduling switch between the fth charging module and the eth charging node. If not, turn off the scheduling switch between the fth charging module and the eth charging node.

[0038] S435: Determine whether the number of charging modules charging the e-th charging node is the same as the requested number. If so, S430 ends and S440 is executed. If not, S436 is executed.

[0039] S436: Determine whether f=a-1, if so, execute S437, if not, set f=f+1, and then return to S434;

[0040] S437: sequentially borrow charging modules from the half-matrix units other than the half-matrix unit where the e-th charging node is located in the system for charging, until the number of charging modules charging the e-th charging node reaches the requested number;

[0041] S440: Determine whether e=a. If so, execute S500. If not, set e=e+1 and then return to S420.

[0042] The beneficial effects of this technical solution are:

[0043] 1. In a semi-matrix unit, very few switching devices can be used, and when any charging module is dispatched to any charging node, each dispatch switch in the semi-matrix unit only carries the output current of one charging module when it is turned on, so there is no need to configure dispatch switches of different models.

[0044] 2. The modular structure of the charging stack scheduling system enables the semi-matrix units to be interconnected through branch structures, ring structures, and mesh structures, and can support the use of the semi-matrix units in the system as charging semi-matrix units or power supplementary semi-matrix units, and can easily expand the number of charging connections and the charging power.

[0045] 3. The implementation of the charging pile scheduling method is relatively simple, and charging scheduling can be easily realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 The schematic diagram of the charging module, charging node and scheduling switch circuit of the half-matrix unit of the embodiment of the present application is shown.

[0047] Figure 2 The present application embodiment is shown Figure 1 On the basis of the semi-matrix unit circuit schematic diagram, an expanded node group is added.

[0048] Figure 3 A schematic diagram of a semi-matrix unit circuit connecting multiple gun ends according to an embodiment of the present application is shown.

[0049] Figure 4 A circuit schematic diagram of a charging stack scheduling system in which a branch-type structure is used to connect half-matrix units according to an embodiment of the present application is shown.

[0050] Figure 5 A circuit schematic diagram of a charging stack scheduling system in which half-matrix units are connected in a ring structure according to an embodiment of the present application is shown.

[0051] Figure 6 The embodiment of the present application shows Figure 5 A circuit schematic for detailed display.

[0052] Figure 7 A circuit schematic diagram of a charging stack scheduling system in which a mesh structure is used to connect semi-matrix units according to an embodiment of the present application is shown.

[0053] Figure 8 A partial circuit schematic diagram is shown when the total charging power of the charging pile scheduling system is expanded according to an embodiment of the present application.

[0054] Fig. 9 The main flow chart of the charging stack scheduling method according to the embodiment of the present application is shown.

[0055] Fig.10 The main flow chart of step S400 in the charging stack scheduling method of the embodiment of the present application is shown.

[0056] Fig.11 The main flow chart of step S430 in the charging stack scheduling method of the embodiment of the present application is shown.

[0057] Fig.12 A scheduling table according to an embodiment of the present application is shown.

[0058] Fig.13 The present application embodiment is shown Fig.12 A continuation of the schedule table shown. DETAILED DESCRIPTION

[0059] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0060] like Figure 1 A half-matrix unit shown includes an equal number of charging modules and charging nodes, each of which is a, and a≥2.

[0061] a charging modules are arranged in sequence, a charging nodes are also arranged in sequence, and the i-th charging module and the i-th charging node are directly connected via a cable, 1≤i≤a.

[0062] a*(a-1) / 2 dispatching switches are respectively set between the i-th charging module and the j-th charging node, 1≤i≤a, 1≤j≤a, i≠j.

[0063] Through such a structure and scheduling switch setting, the number of required scheduling switches can be reduced. Taking a 4×4 matrix as an example, a traditional full-matrix solution requires 16 switch groups, while a half-matrix solution of the present invention only requires 6 switch groups.

[0064] like Figure 2 As shown, in order to stack and expand the half-matrix unit, the half-matrix unit also includes an expansion node group, the number of which is n, and each expansion node group includes a number of expansion nodes that are arranged in sequence, and the i-th expansion node is also connected to the i-th charging node through an expansion switch, 1≤i≤a.

[0065] In this embodiment, if Figure 1 , Figure 2 As shown, a=4, that is, the number of charging modules and charging nodes is 4, and the number of scheduling switches is 6.

[0066] like Figure 3 As shown in the figure, when the charging node is connected to the gun end of the charging gun, a load switch is provided between the charging node and the gun end. If n=1, K1~K6 in the figure are scheduling switches, K7~K10 are load switches, and K11~K14 are expansion switches.

[0067] like Figure 4~Figure 8 A charging stack scheduling system shown includes b half-matrix units.

[0068] In the charging stack scheduling system, the a value of all the half-matrix units is the same, and preferably, the n value of all the half-matrix units is also the same;

[0069] The charging nodes of some or all of the semi-matrix units are connected to the gun end through a load switch, and the semi-matrix units whose charging nodes are connected to the gun end through a load switch serve as charging semi-matrix units. The charging nodes of some semi-matrix units are not connected to the gun end, and the semi-matrix units whose charging nodes are not connected to the gun end serve as power supplement semi-matrix units. The charging stack scheduling system includes at least one charging semi-matrix unit.

[0070] Each half-matrix unit is connected to at least one half-matrix unit, any two connected half-matrix units are connected through an extended node group, each pair of extended nodes with the same serial number in two connected extended node groups of the connected half-matrix units are connected in pairs, and there is one and only one extended switch between the two connected extended nodes.

[0071] In the charging pile scheduling system, the connection structure of the semi-matrix unit includes a branch structure, a ring structure, and a mesh structure.

[0072] The following are some examples of specific forms of charging pile scheduling system:

[0073] 1. If Figure 4 As shown in the figure, the semi-matrix units used in the example all have an extended node group. When the semi-matrix unit connection structure of the charging pile scheduling system adopts a branch-trunk structure:

[0074] The charging pile scheduling system includes a main line and multiple branch lines, and each branch line includes a plurality of semi-matrix units arranged in sequence.

[0075] The first expansion node group of the first half-matrix unit of each branch line is connected to the main line by cables.

[0076] Furthermore, it is not specifically shown in the figure but can be easily known in combination with the half-matrix unit circuit that for the first extended node group of the first half-matrix unit of each branch line, all extended nodes with the same sequence number are connected.

[0077] Since each extended node is directly connected to the corresponding charging node with the same serial number inside the half-matrix unit, it is equivalent to that in each branch line with at least two half-matrix units, the i-th charging node of the first half-matrix unit in the adjacent half-matrix units is respectively connected to the i-th extended node of the first extended node group of the next half-matrix unit, 1≤i≤a.

[0078] If more than one extended node group is used for the half-matrix unit, the first extended node group may be connected in the above manner, and the other extended node groups are reserved for subsequent expansion.

[0079] 2. Figure 5 As shown, when the half-matrix unit connection structure of the charging pile scheduling system adopts a ring structure, each half-matrix unit is connected in series to form a single closed loop. The example in the figure shows the case of using fewer half-matrix units, for example, 3. If more half-matrix units are to be used, the same applies. Each half-matrix unit is connected to the gun end or reserved according to the specific situation. For example, in the figure, 2 half-matrix units are connected to the gun end.

[0080] pass Figure 6 You can see more clearly Figure 5 Taking the configuration in as an example, as a specific connection method, between each adjacent half-matrix unit, the i-th charging node of the previous half-matrix unit is respectively connected to the i-th extended node of the first extended node group of the next half-matrix unit, 1≤i≤a.

[0081] 3. Figure 7 As shown, in Figure 4On the basis of , the half-matrix units used have two extended node groups instead of one, and the cross-branch connection is made through the second extended node group. This example is extended to a general case, that is:

[0082] When n≥2, and there are at least two half-matrix units on each branch, the connection structure of the half-matrix units is expanded from a branch structure to a mesh structure by connecting the half-matrix units in the same order position on each branch respectively, and the half-matrix units across different branches are connected through the xth expansion node group, 2≤x≤n.

[0083] 4. Figure 8 As shown, a section of a branch line of the branch-trunk structure is intercepted for illustration. The same is true for the ring and mesh structures. The half-matrix units used all have two expansion node groups. When the total charging power of the system needs to be expanded, a number of power supplementary half-matrix units are newly connected between any two half-matrix units that have idle expansion node groups.

[0084] It can be seen that the two upper half-matrix units in the figure are connected to the gun end, while the lower half-matrix unit serves as a power supplement half-matrix unit and is not connected to the gun end.

[0085] If the half-matrix units used all have three expansion node groups, then when a number of power supplementary half-matrix units are added, the third expansion node group can also be used to communicate with the Figure 7 Similar connections across the branch lines.

[0086] The main process is as follows Fig. 9 As shown, a charging stack scheduling method adopts the charging stack scheduling system described above, and preferably, in order to be able to execute the scheduling method, the scheduling system also includes a controller and a display module, the controller is used to execute the scheduling method, and the display module is used to display the system status and provide error prompts. The scheduling method is operated according to the following steps:

[0087] S100: The charging stack scheduling system monitors all charging half-matrix units in real time, and counts and numbers the charging half-matrix units currently connected to the gun ends, where the total number of charging half-matrix units connected to the gun ends is c;

[0088] S200: First, determine whether the total number of charging modules required by all charging requests received by the entire system is greater than the total number of charging modules in the charging pile scheduling system. If not, execute S300. If so, feedback an error message that the charging demand cannot be met, and suspend charging. Specifically, feedback is given to the user through the display module.

[0089] S300: set d=1;

[0090] S400: Perform charging scheduling in sequence to each gun end in the dth charging half-matrix unit connected to the gun end, such as Fig.10 Shown include:

[0091] S410: Set e=1;

[0092] S420: Determine whether the e-th charging node is connected to the gun end. If so, execute S430. If not, set e=e+1, and then execute S420 again.

[0093] S430: Perform charging scheduling on the e-th charging node in the half-matrix unit described in S400, such as Fig.11 Shown include:

[0094] S431: Determine whether the e-th charging module is idle. If so, in the half-matrix unit described in S430, disconnect all the scheduling switches connected to the e-th charging module, turn on the load switch between the e-th charging node and its corresponding gun end, so that the e-th charging module charges the e-th charging node, and then execute S432. If not, directly execute S432;

[0095] S432: Determine whether the number of charging modules charging the e-th charging node is the same as the requested number. If so, S430 ends and S440 is executed. If not, S433 is executed.

[0096] S433: set f=1;

[0097] S434: Determine whether the fth charging module excluding the eth charging module in the half-matrix unit is idle. If so, turn on the scheduling switch between the fth charging module and the eth charging node. If not, turn off the scheduling switch between the fth charging module and the eth charging node.

[0098] S435: Determine whether the number of charging modules charging the e-th charging node is the same as the requested number. If so, S430 ends and S440 is executed. If not, S436 is executed.

[0099] S436: Determine whether f=a-1, if so, execute S437, if not, set f=f+1, and then return to S434;

[0100] S437: sequentially borrowing charging modules from the half-matrix units other than the half-matrix unit where the e-th charging node is located in the system for charging, until the number of charging modules charging the e-th charging node reaches the requested number, including:

[0101] S4371: Set g=1;

[0102] S4372: In the g-th half-matrix unit for borrowing charging modules described in S437, each charging module is borrowed in turn until the number of charging modules charging the e-th charging node is the same as the requested number, or the borrowing of all charging modules in the half-matrix unit is completed, and the borrowing step of the charging module includes:

[0103] S43721: Set h=1;

[0104] S43722: If h=e, then within the range of the circuit path with the least extension switches between the hth charging module and the eth charging node, all extension switches are turned on; if h≠e, then the scheduling switch between the hth charging node and the eth extension node is turned on, and within the range of the circuit path with the least extension switches between the extension node and the eth charging node, all extension switches are turned on, and the scheduling switch between the hth charging module and the extension nodes other than the eth in the half-matrix unit is turned off;

[0105] S43723: Determine whether h=a. If so, execute S4373. If not, set h=h+1 and then return to S43722.

[0106] S4373: Determine whether g=b-1. If so, S430 ends and S440 is executed. If not, g=g+1 and the process returns to S4372.

[0107] S440: Determine whether e=a. If so, execute S500. If not, set e=e+1, and then return to S420.

[0108] S500: Determine whether d=c. If so, complete the charging scheduling. If not, set d=d+1, and then return to S400.

[0109] As another implementation method, for a single half-matrix unit, a scheduling table can also be pre-calculated, and the system can directly look up the table according to the demand when using it. The specific table is as follows: Figure 12~Figure 13 shown.

[0110] Inside the half-matrix unit, when the charging module is scheduled to the charging node, the last four columns in the table are the switch state scheduling of K7~K10, that is, the load switch is operated.

[0111] If the half-matrix unit is used to supplement the power of other half-matrix units, the last four columns in the table are the switch status scheduling of K11~K14, that is, the operation of the expansion switch, so the table can be further used for scheduling systems with various different connection methods.

[0112] The above are only some of the embodiments listed in this application and are not intended to limit this application.

Claims

1. A charging stack scheduling method, characterized in that: A charging pile scheduling system is adopted, and the charging pile scheduling system includes b semi-matrix units, and the semi-matrix unit includes: 4 charging modules are arranged in sequence; There are four charging nodes arranged in sequence, the i-th charging module and the i-th charging node are directly connected by a cable, 1≤i≤4, and when the charging node is connected to the gun end of the charging gun, a load switch is provided between the charging node and the gun end; 6 dispatching switches, respectively set between the i-th charging module and the j-th charging node, 1≤i≤4, 1≤j≤4, i≠j; n expansion node groups, each expansion node group includes 4 expansion nodes arranged in sequence, and the i-th expansion node is also connected to the i-th charging node through an expansion switch, 1≤i≤4; The charging nodes of some or all of the semi-matrix units are connected to the gun end through a load switch, and the semi-matrix units whose charging nodes are connected to the gun end through a load switch serve as charging semi-matrix units. The charging nodes of some semi-matrix units are not connected to the gun end, and the semi-matrix units whose charging nodes are not connected to the gun end serve as power supplement semi-matrix units. The charging stack scheduling system includes at least one charging semi-matrix unit. Each half-matrix unit is connected to at least one half-matrix unit, any two connected half-matrix units are connected through an extended node group, each pair of extended nodes with the same sequence number of two connected extended node groups of the connected half-matrix units are connected in pairs, and there is one and only one extended switch between the two connected extended nodes; In the charging pile scheduling system, the connection structure of the semi-matrix unit includes a branch structure, a ring structure, and a mesh structure. When the total charging power of the system needs to be expanded, a number of power supplementary semi-matrix units are newly connected between any two semi-matrix units that have idle expansion node groups. When the semi-matrix unit connection structure of the charging pile scheduling system adopts a branch-trunk structure: The charging pile dispatching system includes a main line and multiple branch lines, each branch line includes a number of semi-matrix units arranged in sequence; The first extended node group of the first half-matrix unit of each branch line is connected to the main line through a cable, and for the first extended node group of the first half-matrix unit of each branch line, all extended nodes with the same serial number are connected; In each branch line having at least two half-matrix units, the i-th charging node of the first half-matrix unit in the adjacent half-matrix units is respectively connected to the i-th extended node of the first extended node group of the second half-matrix unit, 1≤i≤4; When n≥2, and there are at least two half-matrix units on each branch, the connection structure of the half-matrix units is expanded from a branch-shaped structure to a mesh-shaped structure by connecting the half-matrix units in the same order position on each branch respectively, and the half-matrix units across different branches are connected through the xth extended node group, 2≤x≤n; When the half-matrix unit connection structure of the charging pile scheduling system adopts a ring structure, each half-matrix unit is connected in series to form a single closed loop, and: Between each two adjacent half-matrix units, the i-th charging node of the first half-matrix unit is respectively connected to the i-th extended node of the first extended node group of the second half-matrix unit, 1≤i≤4; The charging stack scheduling method comprises the following steps: S100: The charging stack scheduling system monitors all charging half-matrix units in real time, and counts and numbers the charging half-matrix units currently connected to the gun ends, where the total number of charging half-matrix units connected to the gun ends is c; S200: First, determine whether the total number of charging modules required by all charging requests received by the entire system is greater than the total number of charging modules in the charging pile scheduling system. If not, execute S300. If yes, feedback an error message that the charging demand cannot be met, and suspend charging. S300: set d=1; S400: performing charging scheduling in sequence to each gun end in the dth charging half-matrix unit to which the gun end is connected, S400 includes the following steps: S410: Set e=1; S420: Determine whether the e-th charging node is connected to the gun end. If so, execute S430. If not, set e=e+1, and then execute S420 again. S430: performing charging scheduling on the e-th charging node in the half-matrix unit described in S400, including: S431: Determine whether the e-th charging module is idle. If so, in the half-matrix unit described in S430, disconnect all the scheduling switches connected to the e-th charging module, turn on the load switch between the e-th charging node and its corresponding gun end, so that the e-th charging module charges the e-th charging node, and then execute S432. If not, directly execute S432; S432: Determine whether the number of charging modules charging the e-th charging node is the same as the requested number. If so, S430 ends and S440 is executed. If not, S433 is executed. S433: set f=1; S434: Determine whether the fth charging module excluding the eth charging module in the half-matrix unit is idle. If so, turn on the scheduling switch between the fth charging module and the eth charging node. If not, turn off the scheduling switch between the fth charging module and the eth charging node. S435: Determine whether the number of charging modules charging the e-th charging node is the same as the requested number. If so, S430 ends and S440 is executed. If not, S436 is executed. S436: Determine whether f=a-1, if so, execute S437, if not, set f=f+1, and then return to S434; S437: sequentially borrowing charging modules from the half-matrix units other than the half-matrix unit where the e-th charging node is located in the system for charging, until the number of charging modules charging the e-th charging node reaches the requested number, including: S4371: Set g=1; S4372: In the g-th half-matrix unit for borrowing charging modules described in S437, each charging module is borrowed in turn until the number of charging modules charging the e-th charging node is the same as the requested number, or the borrowing of all charging modules in the half-matrix unit is completed, and the borrowing step of the charging module includes: S43721: Set h=1; S43722: If h=e, then within the range of the circuit path with the least extension switches between the hth charging module and the eth charging node, all extension switches are turned on; if h≠e, then the scheduling switch between the hth charging node and the eth extension node is turned on, and within the range of the circuit path with the least extension switches between the extension node and the eth charging node, all extension switches are turned on, and the scheduling switch between the hth charging module and the extension nodes other than the eth in the half-matrix unit is turned off; S43723: Determine whether h=a. If so, execute S4373. If not, set h=h+1 and then return to S43722. S4373: Determine whether g=b-1. If so, S430 ends and S440 is executed. If not, g=g+1 and the process returns to S4372. S440: Determine whether e=a. If so, execute S500. If not, set e=e+1, and then return to S420. S500: Determine whether d=c. If so, complete the charging scheduling. If not, set d=d+1, and then return to S400.

Images