Polygonal linear matrix charging system and group charging power flexible distribution method

Abstract

The invention relates to a new energy automobile charging related technology, belongs to the field of a power distribution circuit system, discloses a polygonal linear matrix charging system and a group charging power flexible distribution method, and comprises the polygonal linear matrix charging system and the group charging power flexible distribution method adopting the polygonal linear matrix charging system. The polygonal linear matrix charging system comprises a plurality of charging piles, each charging pile comprises a plurality of subsystems and a plurality of output charging loops, each subsystem comprises a plurality of power allocation modules, a plurality of output ports and a plurality of direct current contactors, and each subsystem further comprises a polygonal circuit structure. The number of the output charging loops is the same as that of the output ports. The group charging power flexible distribution method comprises the steps of receiving a charging request, calculating distribution power, distributing available power allocation modules in a charging system, outputting power to an output charging loop and the like. According to the invention, capacity expansion and capacity reduction of the charging system can be flexibly carried out, the number of the used DC contactors is small, and the distribution mode is simple.

Description

Technical Field

[0001] The present invention relates to the technical field related to new energy vehicle charging, and in particular to a polygonal linear matrix charging system and a group charging power flexible distribution method. Background Art

[0002] With the development of electric vehicles and charging technology, the charging time of electric vehicles has been gradually shortened, and the user experience has been gradually improved. At present, charging piles are divided into three categories according to charging rate and power: slow charging, fast charging and super charging. Among them, DC charging piles are known for their high power, especially DC piles with 60kW to 240kW, which will be more suitable for fast charging stations and commercial areas. And super charging piles above 250kW will become the preferred choice for long-distance travel and high-speed service areas. In order to meet the demand for faster charging of more cars at the same time, the group charging flexible distribution technology that can charge multiple electric vehicles at the same time is also gradually being developed according to the actual charging power required by electric vehicles, dynamically allocates charging modules, and centrally controls charging equipment, power distribution equipment, and auxiliary equipment.

[0003] The existing group charging flexible distribution methods mainly include star ring power distribution, semi-matrix linear distribution, and full-matrix linear distribution. Among them: star ring power distribution uses a small number of relays and can realize the module mobilization of inner and outer rings, but when the charging circuit direct connection module is occupied by other charging circuits, the output charging circuit directly connected to the module cannot perform charging operations. The charging circuit and module pairing are relatively simple, and all modules in the system cannot be mobilized and the calling logic is complex. The number of modules for single cabinet expansion cannot be flexibly increased. Only 3 modules can be added to the corresponding triangular inner ring, only 4 modules can be added to the corresponding quadrilateral inner ring, and only 6 modules can be added to the corresponding hexagonal inner ring; semi-matrix linear distribution can be flexibly expanded, but the charging modules cannot be fully mobilized. The module utilization rate is limited by the charging conditions and the calling logic is complex; full-matrix linear distribution has the best power distribution, but the number of switches is large, and the expansion and increase of output charging circuits have a great impact on the system, which is not conducive to cross-system parallel connection. Summary of the invention

[0004] In view of the above-mentioned defects, the present invention provides a polygonal linear matrix charging system and a flexible group charging power distribution method, which can flexibly expand and reduce the capacity of the charging system, use fewer DC contactors and have a simpler distribution method.

[0005] In order to achieve the purpose of the present invention, the following technologies are proposed: A polygonal linear matrix charging system includes a plurality of charging stacks, wherein the charging stacks include: A plurality of subsystems, wherein the subsystem comprises a power allocation module, b output ports, and c DC contactors. The subsystem also comprises a polygonal circuit structure, wherein the power allocation module and the output port are connected to the vertices of the polygonal circuit structure. When two adjacent vertices are connected to the output port, a DC contactor is provided on the edge between the two adjacent vertices. Each output port is respectively connected to all power allocation modules in the subsystem through a single line, and is controlled on and off by a DC contactor on the single line. The power allocation module comprises a plurality of charging modules, and the subsystem comprises at least one power allocation module with a charging module quantity of 1. Each subsystem of the same charging system has the same output port quantity b; Multiple output charging circuits are divided into b groups, each group of output charging circuits is connected to an output port of all subsystems in the charging stack, and different groups of output charging circuits are connected to different output ports of the subsystems. The output charging circuits and the output ports of the subsystems connected to them are controlled to be on and off by a DC contactor.

[0006] Furthermore, a≤b, at least one of any two adjacent vertices of the polygonal circuit structure is connected to an output port.

[0007] Furthermore, a≥2, b≥2, c≥4.

[0008] Furthermore, if the power allocation module and the output port connected by a single line are located at two adjacent vertices of the polygonal circuit structure, the single line is a side of the polygonal circuit structure.

[0009] Furthermore, when the charging system includes more than one charging stacks, each charging stack has the same number of subsystems, and all subsystems have the same number of output ports. Each charging stack is connected to each other through a group of parallel connection circuits, and the number of parallel connection circuits in the group of parallel connection circuits is the same as the total number of output ports of a single charging stack. A DC contactor is provided on each parallel connection circuit, and both ends of the parallel connection circuit are respectively connected to an output port of a subsystem in the two charging stacks.

[0010] A group charging power flexible distribution method adopts a polygonal linear matrix charging system.

[0011] The flexible allocation method of group charging power includes: Step 1: receiving a charging request from an output charging circuit, where the charging request includes a requested power; Step 2: Calculate the idle power in the charging system. If the idle power is greater than or equal to the requested power, use the requested power as the allocated power and then execute step 3. If the idle power is less than the requested power, use the idle power as the allocated power and then execute step 3. Step 3: allocating a number of available power allocation modules in the charging system according to the allocated power, and closing all DC contactors on a circuit path having the least number of DC contactors between the power allocation module and the output charging circuit requesting charging; Step 4: Control the charging module allocated in step 3 to output power to the output charging circuit according to the allocated power; Step 5: During step 4, if the requested power from the output charging circuit in step 1 changes, the allocation of the charging modules is adjusted, and the power output of the charging modules is adjusted until charging is completed.

[0012] Furthermore, in the polygonal linear matrix charging system adopted by the method, the rated power of all charging modules is the same.

[0013] Further, step 3 includes: Step 310: sorting and setting serial numbers for all power allocation modules in the charging system, and sorting them from large to small according to the number of charging modules included in the power allocation modules, and the charging system includes m power allocation modules in total; Step 320: Set the module number query variable q, and initialize q=0; Step 330: Set a variable k for calculating the number of charging modules to be allocated, k = allocated power / rated power of a single charging module. If k is an integer, continue directly. If k is not an integer, set k to the smallest integer greater than its value and then continue. Step 340: Set the module query variable i, and initialize i=1; Step 350: Determine whether the i-th power allocation module is idle. If so, close all DC contactors on the circuit path with the least number of DC contactors between the power allocation module and the output charging circuit that requests charging, and make q=q+the number of charging modules of the power allocation module, and then continue. If not, continue directly; Step 360: If q≥k, then step 3 ends. If q<k, then judge: if i≠m, then set i=i+1, and then return to step 350. If i=m, then step 3 ends.

[0014] Further, step 5 includes: Step 510: During the charging process, the charging request from the output charging circuit in step 1 is monitored in real time, and when the requested power changes, it is recorded as a new requested power; Step 520: the idle power in step 2 is used as the original idle power. If the original idle power is greater than or equal to the new requested power, the requested power is used as the new allocated power. Then, step 3 is performed. If the original idle power is less than the new requested power, the idle power is used as the new allocated power. Step 530: If the absolute value of the difference between the new allocated power and the allocated power in step 2 is smaller than the power allocation module with the minimum total power connected to the output charging circuit in step 1, then the charging modules connected to the output charging circuit are evenly adjusted so that the adjusted output charging circuit accepts the charging of the new allocated power, and then directly execute step 550, otherwise execute step 540; Step 540: If the newly allocated power is greater than the allocated power described in step 2, a power allocation module is added for charging, and the DC contactor between the power allocation module and the output charging circuit described in step 1 is closed; if the newly allocated power is less than the allocated power described in step 2, a plurality of DC contactors between the power allocation module used for charging in step 1 and the output charging circuit are disconnected in order of rated power from small to large; Step 550: After charging is completed, disconnect all DC contactors between the output charging circuit in step 1 and each power allocation module that is currently outputting power.

[0015] The beneficial effects of this technical solution are: 1. When upgrading the charging system, it can be quickly expanded in a variety of ways, including increasing the number of power allocation modules in the subsystem, replacing the output port with a power allocation module in the subsystem, increasing the number of charging modules in the existing power allocation module, and increasing the number of subsystems. This can adapt to the ever-increasing charging needs of new energy vehicles and quickly realize the upgrade of the output charging circuit from fast charging to super charging.

[0016] 2. In each individual charging stack in the charging system, full matrix mobilization can be achieved separately to improve the effective utilization of each power allocation module. At the same time, the number of DC contactors can be reduced, the materials used can be reduced, and the labor used to assemble these devices can be reduced.

[0017] 3. On the basis of realizing full matrix mobilization of each charging pile by the charging system and the flexible distribution method of group charging power, multiple existing charging piles can be combined and transformed between the charging piles to realize semi-matrix deployment, so that charging capacity can be expanded and unnecessary reconstruction of charging stations can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The schematic diagram of the subsystem circuit described in Example 1 of the polygonal linear matrix charging system in an embodiment of the present application is shown.

[0019] Figure 2 The schematic circuit diagram of the first subsystem described in Example 2 of the polygonal linear matrix charging system in an embodiment of the present application is shown.

[0020] Figure 3The schematic circuit diagram of the second subsystem described in Example 2 of the polygonal linear matrix charging system in the embodiment of the present application is shown.

[0021] Figure 4 The schematic circuit diagram of the third subsystem described in Example 2 of the polygonal linear matrix charging system in the embodiment of the present application is shown.

[0022] Figure 5 The schematic circuit diagram of the first subsystem described in Example 3 of the polygonal linear matrix charging system in an embodiment of the present application is shown.

[0023] Figure 6 The schematic circuit diagram of the second subsystem described in Example 3 of the polygonal linear matrix charging system in the embodiment of the present application is shown.

[0024] Figure 7 The schematic circuit diagram of the third subsystem described in Example 3 of the polygonal linear matrix charging system in the embodiment of the present application is shown.

[0025] Figure 8 The schematic circuit diagram of the fourth subsystem described in Example 3 of the polygonal linear matrix charging system in an embodiment of the present application is shown.

[0026] Fig. 9 The schematic diagram of the charging stack circuit described in Example 4 of the polygonal linear matrix charging system in the embodiment of the present application is shown.

[0027] Fig.10 A schematic diagram of a subsystem circuit showing a branch output port described in Example 4 of a polygonal linear matrix charging system according to an embodiment of the present application is shown.

[0028] Fig.11 The schematic diagram of the charging stack circuit described in Example 5 of the polygonal linear matrix charging system in the embodiment of the present application is shown.

[0029] Fig.12 A circuit schematic diagram of the polygonal linear matrix charging system described in Example 6 of the embodiments of the present application is shown.

[0030] Fig.13 A flow chart showing the main steps of the method for flexible allocation of group charging power according to an embodiment of the present application is shown.

[0031] Markings in the figure: M is a module, and the number after M represents the serial number of the module; KM is a DC contactor, and the single number after KM represents the serial number of the DC contactor; when there are two numbers separated by a horizontal line after KM, the number before the horizontal line represents the subsystem number, and the number after the horizontal line represents the serial number of the DC contactor in the subsystem; if KM is followed by the word "parallel", then "KM parallel" is a DC contactor in a parallel connection circuit between multiple charging piles, and the number after the horizontal line represents its serial number; S is an output port, and the number after S represents the output port serial number; C is an output charging circuit, and the number after C represents the output charging circuit serial number. DETAILED DESCRIPTION

[0032] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0033] like Figure 1 to Figure 12 As shown, a polygonal linear matrix charging system includes several charging stacks, and the charging stack includes multiple subsystems and multiple output charging loops.

[0034] The subsystem includes a power allocation module, b output ports, and c DC contactors, where a≤b, a≥2, b≥2, and c≥4. The subsystem also includes a polygonal circuit structure, the power allocation module and the output port are connected to the vertices of the polygonal circuit structure, and at least one of any two adjacent vertices of the polygonal circuit structure is connected to the output port. When two adjacent vertices are connected to the output port, a DC contactor is provided on the edge between the two adjacent vertices. Each output port is respectively connected to all power allocation modules in the subsystem through a single line, and is controlled on and off by a DC contactor on the single line. If the power allocation module and the output port connected through a single line are located at two adjacent vertices of the polygonal circuit structure, the single line is a side of the polygonal circuit structure. If the power allocation module and the output port connected through a single line are located at two non-adjacent vertices of the polygonal circuit structure, the single line is located inside the polygon. The power allocation module includes a plurality of charging modules, and the subsystem includes at least one power allocation module with a charging module quantity of 1. Each subsystem of the same charging system has the same output port quantity b.

[0035] The output charging circuit is used to connect the charging gun for charging. All output charging circuits are divided into group B. Each group of output charging circuits is connected to an output port of all subsystems in the charging stack, and different groups of output charging circuits are connected to different output ports of the subsystem. The output charging circuit and the output ports of each subsystem connected to it are controlled on and off by a DC contactor.

[0036] When the charging system includes more than one charging stacks, each charging stack has the same number of subsystems, and all subsystems have the same number of output ports. Each charging stack is connected to each other through a group of parallel connection circuits, and the number of parallel connection circuits in the group of parallel connection circuits is the same as the total number of output ports of a single charging stack. A DC contactor is provided on each parallel connection circuit, and both ends of the parallel connection circuit are respectively connected to an output port of a subsystem in two charging stacks.

[0037] The following is an explanation of each subsystem through some specific examples.

[0038] Example 1: Figure 1 The subsystem shown includes three power allocation modules, each of which includes one, two, and two charging modules respectively. The power of a single charging module is 30kW, so the total power that can be allocated by the subsystem is 150kW. The subsystem includes three output ports; Take output port S1 as an example: If you need to allocate 0~30kW power, close KM2 and allocate from M1; If you need to allocate 30kW~60kW of power, you can use Solution 1: close KM3 to allocate M4 and M5, or you can use Solution 2: close KM7 to allocate M2 and M3; If you need to deploy 60kW~90kW of power, you can use Solution 1: close KM2 and KM3 to deploy M1, M4 and M5, or you can use Solution 2: close KM2 and KM7 to deploy M1, M2 and M3; If 90~120kW power is required, close KM3 and KM7 to adjust M2, M3, M4, and M5; If you need to allocate a power of 120kW~150kW, close KM2, KM3, KM7 and allocate M1, M2, M3, M4, and M5.

[0039] Similarly, S2 and S3 close the corresponding DC contactors to mobilize the corresponding power modules according to power requirements.

[0040] Example 2: If Figure 2~Figure 4 As shown, in Figure 1 On the basis of the subsystem shown in the figure, the three output ports remain unchanged, the power of a single charging module is still 30kW, and there are three power allocation modules. However, the number of charging modules in the power allocation module is changed to form several subsystem variations. Figure 2 In the system, each power allocation module includes a charging module with a total power of 90kW. Figure 3 In the power allocation module, each includes 1, 1, and 2 charging modules, with a total power of 120kW; Figure 4In the test, each power allocation module includes 1, 2, and 3 charging modules respectively, with a total power of 180kW.

[0041] Take the case of deploying to output port S1 as an example: exist Figure 2 The subsystems shown are: If you need to allocate power from 0 to 30 kW, close KM2 to allocate M1, or close KM7 to allocate M2, or close KM3 to allocate M3; If 30kW~60kW of power needs to be allocated, close KM2 and KM3 to allocate M1 and M3, or close KM2 and KM7 to allocate M1 and M2, or close KM3 and KM7 to allocate M2 and M3; If 60kW~90kW of power needs to be allocated, close KM2, KM3, and KM7 to allocate M1, M2, and M3.

[0042] exist Figure 3 The subsystems shown are: If you need to adjust the power from 0 to 30 kW, close KM2 to adjust M1, or close KM7 to adjust M2. If 30kW~60kW of power needs to be allocated, close KM2 and KM7 to allocate M1 and M2, or close KM3 to allocate M3 and M4; If you need to allocate 60kW~90kW of power, close KM2 and KM3 to allocate M1, M3, and M4, or close KM3 and KM7 to allocate M2, M3, and M4; If 90kW~120kW of power needs to be allocated, close KM2, KM3, KM7 and allocate M1, M2, M3, M4.

[0043] exist Figure 4 The subsystems shown are: If you need to adjust the power from 0 to 30kW, close KM2 to adjust M1; If you need to allocate 30kW~60kW of power, close KM7 to allocate M2 and M3; If you need to allocate 60kW~90kW of power, close KM2 and KM7 to allocate M1, M2, and M3, or close KM3 to allocate M4, M5, and M6; If you need to allocate 90kW~120kW of power, close KM2 and KM3 to allocate M1, M4, M5, and M6; If you need to allocate 120kW~150kW of power, close KM3 and KM7 to allocate M2, M3, M4, M5, and M6; If you need to allocate a power of 150kW~180kW, close KM2, KM3, and KM7 to allocate M1, M2, M3, M4, M5, and M6.

[0044] Similarly, in the above three subsystems, S2 and S3 close the corresponding DC contactors according to power requirements to mobilize the corresponding power modules.

[0045] Example 3: If Figure 5~Figure 8 As shown, Figure 1 Compared with the subsystem shown in the figure, the number of power allocation modules and the number of output ports can also form several common subsystem variations. Figure 5 In the subsystem, there are three power allocation modules, each of which includes 1, 2, and 2 charging modules, respectively, with a total power of 150kW. The subsystem also includes 4 output ports. Figure 6 In the subsystem, there are two power allocation modules, each of which includes one and two charging modules, respectively, and can allocate a total power of 90kW. The subsystem also includes two output ports. Figure 7 In the subsystem, there are 4 power allocation modules, each of which includes 1, 2, 2, and 3 charging modules, respectively, with a total power of 240kW. The subsystem also includes 4 output ports. Figure 8 The subsystem includes 4 power allocation modules, each of which includes 1, 2, 2 and 3 charging modules respectively, with a total adjustable power of 240kW. The subsystem also includes 5 output ports.

[0046] The following describes the charging stack composed of the subsystem and the output charging circuit through some specific examples.

[0047] Example 4: Fig. 9 As shown, the charging stack includes 12 output charging circuits, each of which is connected to all n subsystems. Each subsystem in the charging stack has the same number of output ports, and other configurations may be different.

[0048] The subsystem 1 in the charging stack is configured as the subsystem in Example 1, and Fig.10 As shown, each output port is divided into several branch output ports, the number of branch output ports is less than the number of subsystems, and a DC contactor connected to different output charging circuits is set at each branch output port. In this example, S1 is divided into four branch output ports, and connected to KM1-10, KM1-11, KM1-12, and KM1-13 respectively. Fig. 9 As shown in the figure, C1, C2, C3, C4, S2 is divided into four branch output ports, and connected to KM1-14, KM1-15, KM1-16, KM1-17 respectively. Fig. 9As shown in the figure, C5, C6, C7, C8, S3 is divided into four branch output ports, and connected to KM1-18, KM1-19, KM1-20, KM1-21 respectively. Fig. 9 C9, C10, C11, C12 shown in.

[0049] Take the number of subsystems n=8 in the above charging stack as an example, and each subsystem adopts the subsystem of Example 1, that is, the power that can be allocated by each subsystem is 150kW, then the total power that can be allocated by the charging stack is 150kW*8=1200kW.

[0050] On this basis, the power capacity can be quickly expanded by arbitrarily increasing the number of charging modules in the subsystem. For example, adding a charging module to each subsystem will make the subsystem become Figure 4 The subsystems shown in the figure, then the deployable power of each subsystem increases by 30 kW, so the total power that can be deployed is 180kW*8=1440 kW.

[0051] Any reduction in the number of charging modules in a subsystem can quickly achieve power reduction, for example, making the subsystem Figure 3 The subsystem shown can deploy a total power of 120kW*8=960 kW.

[0052] Obviously, by increasing or decreasing the number of subsystems, power expansion or reduction can be achieved quickly. If the power that can be allocated by the subsystem is 150kW, the total power that can be allocated is 150kW*7=1050kW. When there are 7 subsystems, and 9 subsystems, the total power that can be allocated is 150kW*9=1350kW.

[0053] If the power of each subsystem in the charging stack is different, power can still be mobilized from different subsystems of any output charging circuit of the charging stack, because each output charging circuit is connected to all subsystems, and each subsystem has the same number of output ports, and each branch output port has a DC contactor connected to different output charging circuits for individual control.

[0054] Example 5: If Fig.11 As shown, the expansion of the output charging circuit can be quickly realized. The charging stack in this example maintains a total power of 1200kW, but includes 15 output charging circuits. If the subsystem still includes 3 output ports, each output port is divided into 5 branch output ports. Of course, each output port may not be evenly divided into 5 branch output ports, but is usually evenly distributed. For example, if the subsystem includes 4 output ports, in order to connect to 15 output charging circuits, they can be divided into 4, 4, 4, and 3 branch output ports respectively.

[0055] It can be seen from this example that by adding a charging circuit to the charging stack and adding a branch output port to the output port, the number of charging devices can be increased quickly.

[0056] Example 6: Fig.12 As shown, the charging system includes two charging stacks, and the output charging circuits in each charging stack are reduced to 6. Each subsystem adopts the configuration of the subsystem in Example 1, and the branch output ports of each output port are reduced to 2. The output ports of the subsystem located at the bottom of the figure are connected to the output ports of the subsystem located at the top of the figure respectively. For example, S1 of the lower subsystem is connected to S1 of the upper subsystem, S2 of the lower subsystem is connected to S2 of the upper subsystem, and so on. Since there are 4 subsystems in each charging stack and each subsystem has 3 output ports, there are a total of 12 circuits for parallel connection. Therefore, KM parallel 1 to KM parallel 12 are set, and a total of 12 DC contactors on parallel connection circuits are set.

[0057] With such a setting, using the subsystem of Example 1, a charging system with a total power of 1200kW and a total of 12 output charging circuits can still be formed, but it can be converted from a full-matrix deployment mode to a semi-matrix deployment mode.

[0058] Similarly, if the number of charging stacks is greater than two, the circuit structure of each charging stack is arranged in a ring shape, and a group of parallel connection circuits is provided between any two charging stacks, and a DC contactor is provided on the parallel connection circuit.

[0059] A flexible group charging power allocation method using a polygonal linear matrix charging system is proposed based on Fig.13 As shown in the flowchart, please follow the steps 1 to 5 below: Step 1: Receive a charging request from an output charging loop, where the charging request includes a requested power.

[0060] Step 2: Calculate the idle power in the charging system. If the idle power is greater than or equal to the requested power, use the requested power as the allocated power and then execute step 3. If the idle power is less than the requested power, use the idle power as the allocated power and then execute step 3. Specifically, the idle power is the sum of the powers of all power allocation modules in the idle state in the charging system. More specifically, the power allocation module in the idle state is a charging module that is not currently connected to any output charging circuit.

[0061] Step 3: Allocate a number of available power allocation modules in the charging system according to the allocated power, and close all DC contactors on the circuit path with the least number of DC contactors between the power allocation module and the output charging loop requesting charging.

[0062] Specifically, all charging modules in the charging system have the same rated power, and on this basis, step 3 includes: Step 310: sort all the power allocation modules in the charging system and set serial numbers, and sort them from large to small according to the number of charging modules included in the power allocation modules. For example, in a certain charging system, charging modules No. 1 to No. 8 are power allocation modules with 3 charging modules in 8 subsystems, charging modules No. 9 to No. 24 are power allocation modules with 2 charging modules in 8 subsystems, and charging modules No. 25 to No. 32 are power allocation modules with 1 charging module in 8 subsystems. In general, the charging system includes m power allocation modules in total. Step 320: Set the module number query variable q, and initialize q=0; Step 330: Set a variable k for calculating the number of charging modules to be allocated, k = allocated power / rated power of a single charging module. If k is an integer, continue directly. If k is not an integer, set k to the smallest integer greater than its value and then continue. Step 340: Set the module query variable i, and initialize i=1; Step 350: Determine whether the i-th power allocation module is idle. If so, close all DC contactors on the circuit path with the least number of DC contactors between the power allocation module and the output charging circuit that requests charging, and make q=q+the number of charging modules of the power allocation module, and then continue. If not, continue directly; Step 360: If q≥k, then step 3 ends. If q<k, then judge: if i≠m, then set i=i+1, and then return to step 350. If i=m, then step 3 ends.

[0063] Through the specific steps of step 3 above, when performing charging distribution, the power allocation module with a larger number of charging modules can be allocated first, and then the power allocation module with a smaller number of charging modules can be allocated in turn, so that when charging is performed through more output charging circuits, it can still be scheduled more accurately, so that the difference between the total power of each power allocation module being scheduled and the allocated power is smaller.

[0064] Preferably, during the operation of the charging system, at every predetermined time t, among the power allocation modules with the same number of charging modules, the serial number of the power allocation module with the first serial number is swapped to the end of these serial numbers, and the serial numbers of the other power allocation modules are respectively reduced by 1. In this way, when the load is not large for a long time, some subsystems can be used uninterruptedly for a long time, while other subsystems are idle for a long time.

[0065] Step 4: Control the charging modules allocated in step 3 to output power to the output charging circuit according to the allocated power. Specifically, in step 3, except for the last power allocation module that is connected to the output charging circuit for requesting charging, all power allocation modules output full power in step 4. The output power of these power allocation modules is recorded as w. The output power of the last power allocation module that is connected to the output charging circuit for requesting charging is the allocated power minus w. If the power allocation module includes multiple charging modules, each charging module outputs at the same output power on average in step 4.

[0066] Step 5: During step 4, if the requested power from the output charging circuit in step 1 changes, the allocation of the charging modules is adjusted, and the power output of the charging modules is adjusted until charging is completed.

[0067] Specifically, step 5 includes: Step 510: During the charging process, the charging request from the output charging circuit in step 1 is monitored in real time, and when the requested power changes, it is recorded as a new requested power; Step 520: the idle power in step 2 is used as the original idle power. If the original idle power is greater than or equal to the new requested power, the requested power is used as the new allocated power. Then, step 3 is performed. If the original idle power is less than the new requested power, the idle power is used as the new allocated power. Step 530: If the absolute value of the difference between the new allocated power and the allocated power in step 2 is smaller than the power allocation module with the minimum total power connected to the output charging circuit in step 1, then the charging modules connected to the output charging circuit are evenly adjusted so that the adjusted output charging circuit accepts the charging of the new allocated power, and then directly execute step 550, otherwise execute step 540; Step 540: If the newly allocated power is greater than the allocated power described in step 2, a power allocation module is added for charging, and the DC contactor between the power allocation module and the output charging circuit described in step 1 is closed; if the newly allocated power is less than the allocated power described in step 2, a plurality of DC contactors between the power allocation module used for charging in step 1 and the output charging circuit are disconnected in order of rated power from small to large; Step 550: After charging is completed, disconnect all DC contactors between the output charging circuit in step 1 and each power allocation module that is currently outputting power.

[0068] Similarly, when multiple output charging circuits are charged simultaneously, just repeat the above steps.

[0069] The above are only some of the embodiments listed in this application and are not intended to limit this application.

Claims

1. A polygonal linear matrix charging system, characterized in that: The device comprises several charging piles, and the charging piles include: A plurality of subsystems, wherein the subsystem comprises a power allocation module, b output ports, and c DC contactors. The subsystem also comprises a polygonal circuit structure, wherein the power allocation module and the output port are connected to the vertices of the polygonal circuit structure. When two adjacent vertices are connected to the output port, a DC contactor is provided on the edge between the two adjacent vertices. Each output port is respectively connected to all power allocation modules in the subsystem through a single line, and is controlled on and off by a DC contactor on the single line. The power allocation module comprises a plurality of charging modules, and the subsystem comprises at least one power allocation module with a charging module quantity of 1. Each subsystem of the same charging system has the same output port quantity b; Multiple output charging circuits are divided into b groups, each group of output charging circuits is connected to an output port of all subsystems in the charging stack, and different groups of output charging circuits are connected to different output ports of the subsystems. The output charging circuits and the output ports of the subsystems connected to them are controlled to be on and off by a DC contactor.

2. The polygonal linear matrix charging system according to claim 1, characterized in that: a≤b, among any two adjacent vertices of the polygonal circuit structure, at least one is connected to an output port.

3. The polygonal linear matrix charging system according to claim 1, characterized in that: a≥2, b≥2, c≥4.

4. The polygonal linear matrix charging system according to claim 1, characterized in that: If the power allocation module and the output port connected by a single line are located at two adjacent vertices of the polygonal circuit structure, the single line is a side of the polygonal circuit structure.

5. The polygonal linear matrix charging system according to claim 1, characterized in that: When the charging system includes more than one charging stacks, each charging stack has the same number of subsystems, and all subsystems have the same number of output ports. Each charging stack is connected to each other through a group of parallel connection circuits, and the number of parallel connection circuits in the group of parallel connection circuits is the same as the total number of output ports of a single charging stack. A DC contactor is provided on each parallel connection circuit, and both ends of the parallel connection circuit are respectively connected to an output port of a subsystem in two charging stacks.

6. A group charging power flexible allocation method, characterized in that: A polygonal linear matrix charging system as described in any one of claims 1 to 5; The flexible allocation method of group charging power includes: Step 1: receiving a charging request from an output charging circuit, where the charging request includes a requested power; Step 2: Calculate the idle power in the charging system. If the idle power is greater than or equal to the requested power, use the requested power as the allocated power and then execute step 3. If the idle power is less than the requested power, use the idle power as the allocated power and then execute step 3. Step 3: allocating a number of available power allocation modules in the charging system according to the allocated power, and closing all DC contactors on a circuit path having the least number of DC contactors between the power allocation module and the output charging circuit requesting charging; Step 4: Control the charging module allocated in step 3 to output power to the output charging circuit according to the allocated power; Step 5: During step 4, if the requested power from the output charging circuit in step 1 changes, the allocation of the charging modules is adjusted, and the power output of the charging modules is adjusted until charging is completed.

7. The group charging power flexible allocation method according to claim 6, characterized in that: In the polygonal linear matrix charging system adopted by the method, the rated power of all charging modules is the same.

8. The group charging power flexible allocation method according to claim 7, characterized in that: Step 3 includes: Step 310: sorting and setting serial numbers for all power allocation modules in the charging system, and sorting them from large to small according to the number of charging modules included in the power allocation modules, and the charging system includes m power allocation modules in total; Step 320: Set the module number query variable q, and initialize q=0; Step 330: Set a variable k for calculating the number of charging modules to be allocated, k = allocated power / rated power of a single charging module. If k is an integer, continue directly. If k is not an integer, set k to the smallest integer greater than its value and then continue. Step 340: Set the module query variable i, and initialize i=1; Step 350: Determine whether the i-th power allocation module is idle. If so, close all DC contactors on the circuit path with the least number of DC contactors between the power allocation module and the output charging circuit that requests charging, and make q=q+the number of charging modules of the power allocation module, and then continue. If not, continue directly; Step 360: If q≥k, then step 3 ends. If q<k, then judge: if i≠m, then set i=i+1, and then return to step 350. If i=m, then step 3 ends.

9. The group charging power flexible allocation method according to claim 6, characterized in that: Step 5 includes: Step 510: During the charging process, the charging request from the output charging circuit in step 1 is monitored in real time, and when the requested power changes, it is recorded as a new requested power; Step 520: the idle power in step 2 is used as the original idle power. If the original idle power is greater than or equal to the new requested power, the requested power is used as the new allocated power. Then, step 3 is performed. If the original idle power is less than the new requested power, the idle power is used as the new allocated power. Step 530: If the absolute value of the difference between the new allocated power and the allocated power in step 2 is smaller than the power allocation module with the minimum total power connected to the output charging circuit in step 1, then the charging modules connected to the output charging circuit are evenly adjusted so that the adjusted output charging circuit accepts the charging of the new allocated power, and then directly execute step 550, otherwise execute step 540; Step 540: If the newly allocated power is greater than the allocated power described in step 2, a power allocation module is added for charging, and the DC contactor between the power allocation module and the output charging circuit described in step 1 is closed; if the newly allocated power is less than the allocated power described in step 2, a plurality of DC contactors between the power allocation module used for charging in step 1 and the output charging circuit are disconnected in order of rated power from small to large; Step 550: After charging is completed, disconnect all DC contactors between the output charging circuit in step 1 and each power allocation module that is currently outputting power.

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