Double-direct-current bus star ring matrix control system and method of charging pile and storage medium

Abstract

The invention belongs to the technical field of vehicle charging, and particularly relates to a double-direct-current bus star ring matrix control system and method of a charging pile and a storage medium, and the system comprises at least one charging host, each charging host is connected with at least two charging terminals, each charging terminal comprises at least one charging gun, and each charging gun is numbered; each charging host comprises a contactor matrix, a control unit and a plurality of power module groups, and each power module group is composed of a plurality of charging modules; each charging terminal is correspondingly configured with one power module group; two direct current buses; the contactor matrix comprises a ring topology contactor, a bus contactor and a parallel operation contactor; by adopting the double-direct-current bus star ring matrix topological structure and the control method, the use number of contactors is reduced, and the charging facility has flexible expansibility. The ring topology and the double direct current buses are combined, so that the system structure is more concise, and the reliability and maintainability of the system are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vehicle charging, and particularly relates to a double-direct-current-bus star-ring matrix control system and method for a charging pile and a storage medium. BACKGROUND

[0002] The new energy vehicle industry, as a key component of new quality productivity, is also a strategic emerging industry that is a focus of national layout. In recent years, it has shown a vigorous development trend. Under the promotion of continuous upgrading and iteration of battery technology, the charging rate of electric vehicles has been greatly improved, and 1C / 2C batteries are gradually being replaced by 4C or more super-fast charging batteries. This change has led to a rapid increase in the number of new energy super-fast charging vehicles, which in turn has put tremendous demand pressure on power capacity expansion. However, under the current background of limited power resources, super-fast charging equipment generally adopts a one-machine multi-charging mode to meet demand.

[0003] The traditional charging pile power distribution method has many drawbacks. It mainly uses single module switching. In the single module switching scheme, a large number of switches are needed to implement the switching operation of different modules, which not only leads to a significant increase in cost, but also reduces system reliability and increases the failure rate due to complex switching logic. In addition, with the rise and development of heavy truck charging scenarios, the market demand for megawatt super-fast charging continues to rise. However, the traditional power distribution method does not fully consider this development trend at the design stage, and has poor scalability. When a charging station needs to be upgraded to meet the demand for megawatt super-fast charging, it often needs to replace a large number of devices, resulting in high upgrade costs and a large amount of resource waste during the upgrade process. SUMMARY

[0004] In view of the above deficiencies of the prior art, the present application provides a double-direct-current-bus star-ring matrix control system and method for a charging pile and a storage medium.

[0005] In a first aspect, the present application provides a double-direct-current-bus star-ring matrix control system for a charging pile, comprising at least one charging host, each charging host being connected to at least two charging terminals, each charging terminal comprising at least one charging gun and each charging gun being numbered; each charging host comprising: a plurality of power module groups, each power module group being composed of a plurality of charging modules; each charging terminal being configured with a power module group; two direct-current buses; The contactor matrix comprises a ring topology contactor, a bus contactor and a parallel contactor; the ring topology contactor is used to connect all power module groups in a ring topology; the bus contactor is used to connect the power module groups and the double DC bus, wherein one DC bus connects all odd-numbered charging guns through the bus contactor and the power module groups, and the other DC bus connects all even-numbered charging guns through the bus contactor and the power module groups; and the parallel contactor is used to connect the DC bus of multiple charging hosts in a ring shape. The control unit is used for obtaining the power demand of the vehicle BMS, determining the demand priority of the charging gun, generating the switching scheme of the power module group according to the demand priority, and controlling the action of the contactor matrix according to the switching scheme to realize the flexible distribution of the power module group.

[0006] In a second aspect, the application provides a double DC bus star ring matrix control method for a charging pile, comprising: S1, obtaining the power demand of the vehicle BMS connected to each charging terminal; S2, determining the demand priority of all charging guns; S3, calculating the switching scheme of the power module group based on the power demand of the vehicle BMS, the power capacity of each power module group and the demand priority of the charging gun; S4, controlling the contactor matrix to switch the power module group according to the switching scheme; S5, closing the DC contactor on the charging terminal and starting charging.

[0007] Further improvements of the technical solution are as follows: in step S1, obtaining the power demand of the vehicle BMS comprises: S11, the charging terminal establishes a connection with the vehicle BMS through a communication interface and receives the target voltage, the maximum allowable current and the current SOC value sent by the BMS in real time; S12, the control unit calculates the real-time power required by the charging gun based on the received voltage and current data ; S13, continuously monitoring the change of the power demand, when the SOC is in a preset interval, marking it as a high power demand state and increasing the data sampling frequency.

[0008] Further improvements of the technical solution are as follows: step S2 comprises: S21, dividing the charging guns into two types of fast charging guns and super charging guns, and setting the demand priority of the super charging guns to be higher than that of the fast charging guns; S22, when the types of the charging guns are the same, sorting the charging guns according to the starting time, and the charging gun started earlier has a higher demand priority.

[0009] Further improvements of the technical solution are as follows: in step S3, calculating the switching scheme of the power module group comprises: S311, determining the rated power of the single power module group ; S312, for each charging gun, calculating the required power module group number according to its power demand ; ; wherein, is a ceiling function; S313, assigning power module groups to each charging gun in order of demand priority from high to low, and preferentially meeting the demand of high-priority charging guns; S314, when the power module group of a single charging host is insufficient, calculating the number of groups that need to be borrowed from other connected charging hosts.

[0010] Further improvements of the technical solution include that step S3 further comprises: after determining the required power module group number, formulating a switching scheme according to a preset switching rule, which includes: S321, for the current charging gun whose required power module group number has been determined, preferentially inputting the corresponding configured power module group, connecting through the contactor between the power module group and the charging terminal, marking the power module group connected to the current charging gun as the currently held power module group, and counting the number N1 of the currently held power module groups; S322, judging whether the number N1 of the currently held power module groups of the current charging gun is greater than or equal to the required power module group number N of the current charging gun; if not, go to S323; if yes, execute step S4; S323, judging whether the adjacent power module group of the current power module group meets the switching condition; if yes, go to step S324; if not, go to step S325; S324, inputting the adjacent power module group through the ring topology contactor, marking the adjacent power module group as the currently held power module group, recalculating the number N1 of the currently held power module groups of the current charging gun, and judging whether the recalculated number N1 of the currently held power module groups is greater than or equal to the required power module group number N of the current charging gun; if yes, execute step S4; if not, go to step S325; S325, judging whether other idle power module groups on the same DC bus as the current power module group meet the switching condition; if yes, go to step S326; if not, go to step S327; S326, other idle power module groups on the same DC bus that meet the switching condition are put into by the bus contactor, the put-in power module groups are marked as the current held power module groups, and the current held power module group number N1 of the current charging gun is recalculated; whether the recalculated current held power module group number N1 is greater than or equal to the required power module group number N of the current charging gun is judged; if yes, step S4 is executed; if no, step S327 is turned to; S327, whether the power module groups on another DC bus meet the switching condition is judged; if yes, step S328 is turned to; if no, step S329 is turned to; S238, the bus contactor corresponding to the power module groups on another DC bus that meet the switching condition is closed, the power module groups on another DC bus that meet the switching condition are put into through the adjacent power module groups and the corresponding ring topology contactors, the put-in power module groups are marked as the current held power module groups, and the current held power module group number N1 of the current charging gun is recalculated; whether the recalculated current held power module group number N1 is greater than or equal to the required power module group number N of the current charging gun is judged; if yes, step S4 is executed; if no, whether the system is a single charging host is judged; if yes, the switching scheme is generated according to the current put-in power module groups; if no, the power module groups on another charging host that meet the switching condition are put into through the parallel machine contactor, and the switching scheme is generated.

[0011] Further improvement of the technical solution is that the method for judging whether the adjacent power module groups meet the switching condition in step S323 comprises: whether the adjacent power module groups are in an idle state is judged; if idle, the adjacent power module groups are put into through the ring topology contactor; if not idle, whether the charging gun occupying the adjacent power module groups is the charging gun corresponding to the adjacent power module groups and the charging gun corresponding to the adjacent power module groups of the adjacent power module groups of the adjacent power module groups, whether the adjacent power module groups have power excess, whether the adjacent power module groups are in the marked cut-out state, and whether the demand priority of the current charging gun is higher than the demand priority of the charging gun occupying the adjacent power module groups are judged; if the charging gun occupying the adjacent power module groups is not the charging gun corresponding to the adjacent power module groups and not the charging gun corresponding to the adjacent power module groups of the adjacent power module groups of the adjacent power module groups, the adjacent power module groups have power excess, the adjacent power module groups are not in the marked cut-out state, and the demand priority of the current charging gun is higher than the demand priority of the charging gun occupying the adjacent power module groups, the charging gun occupying the adjacent power module groups is cut out, and the adjacent power module groups are put into through the ring topology contactor.

[0012] Further improvements of the technical solution are as follows: the method for determining whether other idle power module groups on the same DC bus as the power module group meet the switching condition in step S325 comprises: determining whether the DC bus where the power module group is located is in an idle state; if it is idle, marking the DC bus as in use and switching in other idle power module groups on the same DC bus through the bus contactor; if it is not idle, determining whether the power module group occupying the DC bus is the power module group; if it is, switching in other idle power module groups on the same DC bus; if it is not, determining whether the demand priority of the power module group is higher than the demand priority of the power module group occupying the DC bus; if it is, disconnecting the bus contactor corresponding to the power module group occupying the DC bus and the bus contactor corresponding to the power module group associated with the power module group, cutting off the DC bus; traversing all power module groups and switching in other idle power module groups on the same DC bus; if it is not, proceeding to step S327.

[0013] Further improvements of the technical solution are as follows: before each power module group is switched in, determining whether the power module group to be switched in has a fault; if it does not, switching it in; if it does, issuing an alarm.

[0014] In a third aspect, the application provides a computer storage medium, wherein the computer readable storage medium stores instructions, which, when executed on a computer, cause the computer to perform the method of the above aspects.

[0015] The application has the following advantages: reduce costs and simplify structure: traditional charging pile power distribution methods mainly rely on single module switching, requiring a large number of switches to implement switching operations of different modules, resulting in high costs and complex structure. The application significantly reduces the number of contactors used by adopting a double DC bus star ring matrix structure, thereby reducing hardware costs. At the same time, the combination of ring topology and double DC bus makes the system structure more simple, improving the reliability and maintainability of the system.

[0016] Improve switching efficiency and flexibility: The control method of the invention obtains the vehicle BMS demand, determines the charging gun demand priority, and generates the switching scheme of the power module group according to these information, realizing the flexible allocation of the power module group. Compared with the traditional method, the invention is more efficient in power distribution process, can quickly respond to the demand changes of different charging guns, and improves the charging efficiency. At the same time, the ring topology makes the power module group can be flexibly called between different charging guns, further enhancing the flexibility of the system.

[0017] Enhance system scalability: With the development of heavy truck charging scene, the market demand for megawatt super charging continues to increase. The traditional charging pile power distribution method has poor scalability, which is difficult to meet the demand of large-scale charging station. The invention realizes the DC bus ring connection of multiple charging hosts through parallel contactors, so that the system can be easily expanded to megawatt super charging scene. When it is necessary to increase the charging host, only need to connect the DC bus of the new host into the ring topology through the parallel contactor, without the need to replace the equipment on a large scale, significantly reducing the upgrade cost.

[0018] Optimize resource utilization and reduce waste: The invention realizes the efficient use of power resources by monitoring the power demand of charging guns in real time and dynamically adjusting the allocation of power module group according to the demand priority. During the charging process, the system can adjust the power distribution strategy according to the real-time data of vehicle BMS to ensure that each charging gun can obtain the required power support. This dynamic adjustment mechanism avoids the resource waste problem caused by fixed power distribution in traditional method, and improves the overall operation efficiency of charging station.

[0019] Improve system reliability and stability: The control method of the invention will conduct strict fault detection before the power module group is put into use, to ensure that only the fault-free power module group can be put into use. This mechanism effectively avoids the system crash problem caused by power module failure, improves the reliability and stability of the system. At the same time, the system also has a perfect priority management mechanism, which can reasonably allocate resources when multiple charging guns demand power at the same time, avoiding the system conflict caused by resource contention. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the invention or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0021] Figure 1 The connection diagram of a single charging host in the control system.

[0022] Figure 2A schematic diagram of connection of double charging hosts in a control system.

[0023] Figure 3 A schematic diagram of connection of multiple charging hosts in a control system.

[0024] Figure 4 A schematic flow chart of a method of one embodiment of the present application.

[0025] 110 is a charging gun, 120 is a power module group, 130 is a DC bus, 141 is a ring topology contactor, and 142 is a bus contactor. DETAILED DESCRIPTION

[0026] In order to make the objectives, characteristics and advantages of the present application more obvious and easy to understand, the technical solutions in the present application will be described clearly and completely below in combination with the drawings in the specific embodiments. Obviously, the embodiments described below are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is only for the purpose of describing specific embodiments and is not intended to limit the present application.

[0028] As shown in Figure 1 , Figure 2 and Figure 3 , the present application provides a double DC bus star ring matrix control system of a charging pile, comprising at least one charging host, each charging host being connected to at least two charging terminals, each charging terminal comprising at least one charging gun and each charging gun being numbered; each charging host comprising: a plurality of power module groups, each power module group being composed of a plurality of charging modules; each charging terminal being correspondingly configured with a power module group; two DC buses; a contactor matrix comprising a ring topology contactor, a bus contactor and a parallel connection contactor; the ring topology contactor being used to connect all the power module groups end to end to form a ring topology; the bus contactor being used to realize connection of the power module groups with the double DC buses, wherein one DC bus connects all the charging guns numbered with odd numbers through the bus contactor and the power module groups, and the other DC bus connects all the charging guns numbered with even numbers through the bus contactor and the power module groups; the parallel connection contactor being used to realize ring connection of the DC buses of multiple charging hosts; A control unit is configured to acquire vehicle BMS demand, determine demand priority of the charging gun, generate a switching scheme of the power module group according to the demand priority, and control the contactor matrix to act according to the switching scheme, so as to realize flexible distribution of the power module group.

[0029] Specifically, the present application comprises double DC bus and ring topology structure, one of the two DC buses connects all odd-numbered charging guns to one bus, and the other DC bus connects all even-numbered charging guns to one bus, and all charging modules on the same bus can be arbitrarily switched to other charging gun ports through the bus. The outermost end is a ring topology, all power module groups are connected through a contactor matrix, each charging module group is connected to a corresponding charging terminal, and each charging terminal can flexibly call the charging module of the whole machine through the double DC bus and the ring topology structure of the outer ring, so as to realize efficient and high-power charging.

[0030] Figure 4 is a schematic flowchart of the method of one embodiment of the present application. Wherein, Figure 4 The execution subject can be a double DC bus star ring matrix control system of a charging pile. According to different requirements, the order of steps in the flowchart can be changed, and some can be omitted.

[0031] As Figure 4 shown, the method comprises: S1, acquiring power demand of vehicle BMS connected by each charging terminal; S2, determining demand priority of all charging guns; S3, calculating a switching scheme of the power module group based on the power demand of the vehicle BMS, the power capacity of each power module group, and the demand priority of the charging gun; S4, controlling the contactor matrix to switch the power module group according to the switching scheme; S5, closing the DC contactor on the charging terminal, and starting charging.

[0032] In order to facilitate the understanding of the present application, the principle of the double DC bus star ring matrix control method of the charging pile of the present application is described further in combination with the process of controlling the charging pile by the double DC bus star ring matrix in the embodiment.

[0033] Firstly, in step S1, acquiring the power demand of the vehicle BMS comprises: S11, the charging terminal establishes connection with the vehicle BMS through a communication interface, and real-time receives target voltage, maximum allowable current and current SOC value sent by the BMS; S12, the control unit calculates the real-time power required by the charging gun at present based on the received voltage and current data ; S13. Continuously monitor changes in power demand. When the SOC is in a preset range, mark it as a high power demand state and increase the data sampling frequency.

[0034] Secondly, step S2 includes: S21. Divide the charging guns into two categories: fast charging guns and supercharging guns, and set the demand priority of supercharging guns to be higher than that of fast charging guns. S22. When the charging guns are of the same type, they are sorted by the time they start up successfully, with the charging guns that start up earlier having higher priority.

[0035] Next, in step S3, the power module switching scheme is calculated as follows: S311. Determine the rated power of a single power module group. ; S312. For each charging gun, according to its power requirements... Calculate the required number of power module groups ;in, It is a rounding function; S313. Assign power module groups to each charging gun in descending order of demand priority, giving priority to meeting the needs of high-priority charging guns. S314. When the power module group of a single charging host is insufficient, calculate the number of module groups that need to be borrowed from other connected charging hosts.

[0036] Furthermore, step S3 also includes: after determining the required number of power module groups, formulating a switching scheme according to preset switching rules, which include: S321. For the current charging gun with a determined number of power module groups, prioritize the use of the corresponding power module group configured in this group. Connect the power module group to the charging terminal by closing the contactor. Mark the power module group connected to the current charging gun as the currently held power module group and count the number of currently held power module groups N1. S322. Determine whether the current power module group N1 held by the current charging gun is greater than or equal to the number of power module groups N required by the current charging gun; if not, go to S323; if yes, execute step S4. S323. Determine whether the adjacent power module groups of this power module group meet the switching conditions; if yes, proceed to step S324; if no, proceed to step S325. S324, put in the adjacent power module group through the ring topology contactor, mark the adjacent power module group as the current held power module group, recalculate the current held power module group number N1 of the current charging gun, and determine whether the recalculated current held power module group number N1 is greater than or equal to the required power module group number N of the current charging gun; if yes, execute step S4; if no, go to step S325; S325, determine whether other idle power module groups on the same DC bus as the current power module group meet the switching condition; if yes, go to step S326; if no, go to step S327; S326, put in the other idle power module groups on the same DC bus that meet the switching condition through the bus contactor, mark the put-in power module group as the current held power module group, and recalculate the current held power module group number N1 of the current charging gun; determine whether the recalculated current held power module group number N1 is greater than or equal to the required power module group number N of the current charging gun; if yes, execute step S4; if no, go to step S327; S327, determine whether the power module group on another DC bus meets the switching condition; if yes, go to step S328; if no, go to step S329; S238, close the bus contactor corresponding to the power module group on another DC bus that meets the switching condition, put in the power module group on another DC bus that meets the switching condition through the adjacent power module group and the corresponding ring topology contactor, mark the put-in power module group as the current held power module group, and recalculate the current held power module group number N1 of the current charging gun; determine whether the recalculated current held power module group number N1 is greater than or equal to the required power module group number N of the current charging gun; if yes, execute step S4; if no, determine whether the system is a single charging host; if yes, generate a switching scheme according to the current put-in power module group; if no, put in the power module group on another charging host that meets the switching condition through the parallel connection contactor, and generate a switching scheme.

[0037] Further, the method for determining whether the adjacent power module group meets the switching condition in step S323 includes: determine whether the adjacent power module group is in an idle state; if idle, put in the adjacent power module group through the ring topology contactor; If not idle, it is judged whether the charging gun of the adjacent power module group is the charging gun corresponding to the adjacent power module group and the charging gun corresponding to the adjacent power module group of the adjacent power module group, whether the adjacent power module group has power excess, whether the adjacent power module group is in the marked cut-out state, and whether the demand priority of the current charging gun is higher than the demand priority of the charging gun of the adjacent power module group; If the charging gun of the adjacent power module group is not the charging gun corresponding to the adjacent power module group and the charging gun corresponding to the adjacent power module group of the adjacent power module group, the adjacent power module group has power excess, the adjacent power module group is not in the marked cut-out state, and the demand priority of the current charging gun is higher than the demand priority of the charging gun of the adjacent power module group, the charging gun of the adjacent power module group is cut out, and the adjacent power module group is put into through the ring topology contactor.

[0038] Further, the method for judging whether other idle power module groups on the same DC bus as the power module group satisfy the switching-in condition in step S325 includes: It is judged whether the DC bus where the power module group is located is in an idle state; If idle, the DC bus is marked as in use, and other idle power module groups on the same DC bus are put into through the bus contactor; If not idle, it is judged whether the power module group occupying the DC bus is the power module group; If yes, other idle power module groups on the same DC bus are put into; If not, it is judged whether the demand priority of the power module group is higher than the demand priority of the power module group occupying the DC bus; If yes, the bus contactor corresponding to the power module group occupying the DC bus and the bus contactor corresponding to the power module group associated with the power module group are disconnected, the DC bus is cut out, all power module groups are traversed, and other idle power module groups on the same DC bus are put into; If not, go to step S327.

[0039] In addition, the method further includes: Before each power module group is put into, it is judged whether the power module group to be put into has a fault; If not, put into; If yes, an alarm is issued.

[0040] The purpose of the present application is to overcome the shortcomings of poor flexibility or high cost of contactor matrix and complex switching logic in the existing charging stack switching technology, provide a super-charging multi-gun charging topology and control algorithm, which can enable a single gun to distribute multiple power modules through a double DC bus and a ring topology structure, and when a large station needs multiple charging hosts, the topology and control method can realize parallel operation of multiple charging hosts, so that a single gun can call power modules across the charging host to realize high-power charging function.

[0041] To achieve the above-mentioned goal, the present application adopts the following technical solutions: The double-bus star-ring topology in the present application has two modes of single-machine high-power output and multi-machine parallel operation. In the single-machine mode, the charger is composed of a double DC bus and a ring topology. One of the two DC buses connects all odd-numbered charging guns to a bus, and the other DC bus connects all even-numbered charging guns to a bus. All charging modules on the same bus can be arbitrarily switched to other charging gun ports through the bus. The outermost end is a ring topology, and the power module group is composed of multiple charging modules. The number of power module groups corresponds to the number of charging guns. All power module groups are connected through a contactor matrix. Each charging module group is connected to a corresponding charging terminal. Each charging terminal can flexibly call the charging modules of the whole machine through the double DC bus and the ring topology structure of the outer ring to realize efficient and high-power charging. In the multi-machine parallel operation mode, the DC buses of two or more charging hosts are connected in a ring. The topology is shown in the drawing. The present application takes two groups of one-machine-twelve-charging devices and three groups of one-machine-twelve-charging devices as examples, as shown in Figure 2 and Figure 3 The actual application can be composed of multiple groups of different chargers, and the charger is not limited to one-machine-eight-charging, but can be expanded to one-machine-multiple-charging.

[0042] The topology structure in the present example takes double-host parallel connection as a typical case, as shown in Figure 2 The numbers in the box represent power module group numbers, the numbers with # represent charging gun numbers, and k with numbers represent contactor numbers. Each contactor contains one positive contactor and one negative contactor. The contactor with the number k9n is a DC bus parallel connection contactor, and the contactors with the numbers kn-k3n are contactors in the power routing.

[0043] The module groups of each gun mouth (i.e. charging gun) form a ring topology through contactors; the system has two busbars, which are connected with odd module groups (1, 3, 5, 7...) and even module groups (2, 4, 6, 8...) respectively, forming a star topology; multiple backend machines can be connected through the two busbars; any gun has three input circuits, which are the left side of the ring, the right side of the ring and the busbar connected, and the power distribution process mainly includes obtaining the demand of the vehicle BMS (battery management system), calculating the demand and priority of all charging ports, calculating the switching scheme according to the power capacity of the charging machine, controlling the contactor matrix to switch the power unit, and closing the charging terminal DC contactor to start charging. After charging is started, the order of occupying power module groups is the power module group, the idle adjacent power module group, the other idle module groups on the idle busbar and other idle module groups.

[0044] The charging pile product is composed of a charging machine and a charging terminal, the charging terminal is composed of human-computer interaction and a charging gun assembly, and is used for connecting an electric vehicle and charging the electric vehicle. The charging machine is composed of a power AC busbar, a charging module and a power route (composed of a contactor matrix, which distributes the charging module groups to the contactor matrix of each charging terminal according to the control strategy), and the charging host adjusts the power module through the power route according to the power demand of the charging terminal, and provides energy to the charging terminal.

[0045] The double-busbar star-ring topology in the application has single-machine high-power output and multi-machine parallel operation modes. In the single-machine mode, the charging machine is composed of double DC busbars and a ring topology. One of the two DC busbars connects all odd-numbered charging guns to a busbar, and the other DC busbar connects all even-numbered charging guns to a busbar. All charging modules on the same busbar can be arbitrarily switched to other charging gun mouths through the busbar. The outermost end is a ring topology, the power module group is composed of multiple charging modules, the number of power module groups corresponds to the number of charging guns, all power module groups are connected through a contactor matrix, each charging module group is connected with a corresponding charging terminal, and each charging terminal can flexibly call the charging modules of the whole machine through the double DC busbar and the ring topology structure of the outer ring to realize efficient and high-power charging. In the multi-machine parallel operation mode, the double DC busbars of two or more charging hosts are connected in a ring shape. In this example, a 12-machine topology is taken as an example, and in actual application scenarios, 4, 6, 8, 10, 12, 16 and other configuration modes can be configured according to requirements.

[0046] Double DC busbar star-ring system control method The power distribution process mainly includes obtaining the demand of the vehicle BMS (battery management system), calculating the demand and priority of all charging ports, calculating the switching scheme according to the power capacity of the charging machine, controlling the contactor matrix to switch the power unit, and closing the charging terminal DC contactor to start charging.

[0047] After charging, the order of occupying power module groups is: the current group, idle adjacent power module groups, other idle module groups on the bus, and other idle module groups. Taking any gun as an example, the default is to use the current module group, i.e., module group 1. When the demand increases, the bus tie is closed, and the left module group 12 is put into use. When the demand continues to increase, the bus tie is closed, and the right module group 2 is put into use. When the demand continues to increase, the bus is occupied, and the idle module groups (3, 5, 7, 9, and 11) on the bus are put into use. When the demand continues to increase, the other idle module groups (4, 6, 8, and 10) are put into use.

[0048] Suppose that during charging, gun 1 occupies all idle modules at the back end (host). When the demand decreases, if a high-priority gun performs a preemption action, it first releases other module groups, then releases bus module groups, then releases adjacent module groups, and finally releases the current module group. The specific algorithm execution steps are as follows: Step 1: Check whether there is a charging gun. If not, exit the current round of checks. If so, continue with the following steps.

[0049] Step 2: For the current charging gun, sort fast-charging guns and super-charging guns according to the order of successful start charging.

[0050] Step 3: Sort each group according to the frequency of module use from low to high.

[0051] Step 4: According to the start order table, iterate through each charging gun. Based on the best output required module number N under the current charging voltage, compare it with the current module number N1. If N is equal to N1, no processing is required.

[0052] Step 5: If N is less than N1, no processing is required.

[0053] Step 6: If N is greater than N1, execute the following loop steps.

[0054] Step 7: Determine whether the current gun's N is greater than N1. If not, no processing is required, and continue searching for other guns. If so, check whether the adjacent module is idle. If it is idle, mark the adjacent module's corresponding gun as the current gun, recalculate N1, and trigger module input (adjacent module, current gun). If the module is not idle, determine whether the adjacent module's corresponding gun is not the current gun and not the adjacent gun, whether the power is excessive and not in the cut-out state, or whether the current gun has a higher priority. If so, trigger module cut-out (adjacent module, corresponding gun), continue searching for other guns. Otherwise, go to Step 8.

[0055] Step 8: If the bus is not idle, determine whether the priority of the current gun port holding the bus is higher than the current gun port. If yes, continue to search for other gun ports. If no, determine the current bus state. If the bus is in use, perform a bus preemption action. First, mark the bus state as adjusting, trigger the launch action of all bus modules and associated modules of the current bus holder (all bus modules and associated modules held by the bus holder, the bus holding gun port), and continue to search for other gun ports. If the bus is in adjusting, check whether the bus holding gun port is still occupied by bus modules and associated modules. If not, perform a bus disconnection action and mark the bus state as idle. If still occupied, continue to search for other gun ports. If the current bus occupier is the current gun port, check whether there is an idle module group. Perform a module launch action (idle module group, current gun port) to mark the idle module group as the current gun port, recalculate N1, and jump to step 7. If the bus is idle, mark the bus state as in use, the bus holder as the current gun port, trigger the module launch action (bus modules and associated modules, current gun port) to mark the corresponding module as the current gun port, recalculate N1, and jump to step 7.

[0056] Step 9: If the idle bus module in the adjacent group or on the bus is occupied, but still cannot meet the demand, check whether the priority of other modules is lower than the current gun port. If the priority is low, perform a module launch action (other module group, current gun port) or a preemption action.

[0057] Step 10: In all the above launch processes, before launching the module group, it is necessary to determine whether the module group meets the launch conditions. The judgment conditions are as follows: the corresponding gun port of the module group has no fault; the corresponding gun port of the module group is not inserted with a gun, or is inserted with a gun but the stage is charging completion.

[0058] For example, using Figure 2Charging gun #1 is in operation. If the optimal output of charging gun #1 under the current charging voltage requires N modules to be activated, compare N with the current number of modules N1 held by charging gun #1. If N is consistently greater than N1, check if the adjacent power module groups #2 and #12 are idle. If power module group #2 is idle, mark charging gun #2 corresponding to power module group #2 as the current port, recalculate N1, and trigger the activation of adjacent idle power module groups. If neither power module group #2 nor power module group #12 is idle, determine if the charging gun occupying the adjacent power module group (taking power module group #2 as an example) is the charging gun configured for the adjacent power module group. The system considers factors such as whether the charging gun is configured for an adjacent power module group, whether the adjacent power module group has excess power, whether the adjacent power module group is marked as being switched out, and whether the current charging gun's demand priority is higher than the demand priority of the charging gun occupying the adjacent power module group. If the charging gun occupying power module group 2 is neither charging gun #2 nor charging gun #3, and power module group 2 has excess power, and power module group 2 is not marked as being switched out, and the demand priority of charging gun #1 is higher than the demand priority of the charging gun occupying power module group 2, then the charging gun occupying power module group 2 will be switched out, and power module group 2 will be put into operation through ring topology contactor k1.

[0059] If the adjacent power module groups 2 and 12 are not idle and do not meet the above switching conditions, then iterate through other idle power module groups on the same DC bus as power module group 1 to see if they meet the switching conditions, that is, determine whether odd-numbered power module groups such as power module group 3 meet the switching conditions: Determine the DC bus where power module group 1 is located ( Figure 2 Is the yellow busbar in the image (in the image) in an idle state? If the DC bus is idle, mark it as in use to avoid charging conflicts; If the DC bus where power module group 1 is located is not idle, then determine whether the power module group occupying the yellow DC bus is power module group 1. If so, then other idle power module groups on the same DC bus will be put into operation; If not, determine whether the demand priority of power module group No. 1 is higher than the demand priority of power module group occupying DC bus. If yes, the bus contactors corresponding to the DC bus power module group and the bus contactors corresponding to the power module group associated with the power module group are disconnected, and the DC bus is cut out; all power module groups are traversed, and other idle power module groups on the same DC bus are put into operation; that is, if the power module group currently occupying the yellow bus is the No. 3 power module group, and the demand priority of the No. 3 power module group is lower than that of the No. 1 power module group, the bus contactor k23 corresponding to the No. 3 power module group is disconnected, and the bus contactors k25 and k27 corresponding to the No. 5 power module group and the No. 7 power module group associated with the No. 3 power module group are disconnected (that is, before this, the No. 5 power module group and the No. 7 power module group are put into operation to supply power charging for the charging gun corresponding to the No. 3 power module group).

[0060] Similarly, it can be judged whether the power module group on another host satisfies the input condition, and if yes, the power module group satisfying the input condition is put into operation through the parallel connection contactor and the corresponding ring topology contactor or bus contactor, and the charging power is insufficient.

[0061] The application further provides a computer storage medium, wherein the computer storage medium can store a program, and the program can include part or all steps in the embodiments provided by the application when executed. The storage medium can be a magnetic disc, an optical disc, a read-only memory (ROM) or a random access memory (RAM) and the like.

[0062] Those skilled in the art can clearly understand that the technology in the embodiments of the application can be realized by means of software and necessary general hardware platforms. Based on such understanding, the technical solutions in the embodiments of the application can be embodied in the form of a software product, which is stored in a storage medium such as a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disc or an optical disc and various media capable of storing program codes, and includes a plurality of instructions for causing a computer terminal (which can be a personal computer, a server or a second terminal, a network terminal and the like) to execute all or part of the steps of the method described in the embodiments of the application.

[0063] Although the present application has been described in detail with reference to the preferred embodiments, it should be understood that the application is not limited to those preferred embodiments. Various modifications and equivalents can be made by those skilled in the art without departing from the spirit and scope of the application. Any and all modifications and equivalents are intended to be included within the scope of the present application.

Claims

1. A dual DC bus star-ring matrix control system for a charging pile, characterized in that, The charging system comprises at least one charging host, each charging host is connected with at least two charging terminals, each charging terminal comprises at least one charging gun (110) and each charging gun (110) is numbered; each charging host comprises: a plurality of power module groups (120), each power module group (120) is composed of a plurality of charging modules; each charging terminal is correspondingly provided with one power module group (120); two DC bus lines (130); a contactor matrix, comprising a ring topology contactor (141), a bus contactor (142) and a parallel contactor; the ring topology contactor (141) is used to connect all the power module groups (120) in a ring topology; the bus contactor (142) is used to realize the connection between the power module group (120) and the double DC bus line (130), wherein one DC bus line connects all the charging guns (110) numbered with odd numbers through the bus contactor (142) and the power module group (120), and the other DC bus line connects all the charging guns (110) numbered with even numbers through the bus contactor (142) and the power module group (120); the parallel contactor is used to realize the ring connection of the DC bus lines (130) of the plurality of charging hosts; a control unit, used for obtaining the power demand of the vehicle BMS, determining the demand priority of the charging gun (110), generating the switching scheme of the power module group (120) according to the demand priority and controlling the action of the contactor matrix according to the switching scheme to realize the flexible distribution of the power module group (120).

2. A dual DC bus star ring matrix control method of a charging pile, characterized in that, comprises: S1, obtaining the power demand of the vehicle BMS connected with each charging terminal; S2, determining the demand priority of all the charging guns; S3, calculating the switching scheme of the power module group based on the power demand of the vehicle BMS, the power capacity of each power module group and the demand priority of the charging gun; S4, controlling the contactor matrix to switch the power module group according to the switching scheme; S5, closing the DC contactor on the charging terminal and starting charging.

3. The dual DC bus starling matrix control method of claim 2, wherein, In step S1, obtaining the power demand of the vehicle BMS comprises: S11, the charging terminal establishes connection with the vehicle BMS through a communication interface and receives the target voltage, the maximum allowable current and the current SOC value sent by the BMS in real time; S12, the control unit calculates the real-time power currently required by the charging gun based on the received voltage and current data ; S13, continuously monitoring the power demand change, when the SOC is in a preset interval, marking as a high power demand state and increasing the data sampling frequency.

4. The dual DC bus starling matrix control method of claim 2, wherein, Step S2 comprises: S21, dividing the charging guns into two types of fast charging guns and super charging guns, and setting the demand priority of the super charging gun to be higher than that of the fast charging gun; S22, when the types of the charging guns are the same, sorting according to the starting time of the charging guns, and the demand priority of the charging gun started earlier is high.

5. The dual DC bus starling matrix control method of claim 3, wherein, In step S3, calculating the switching scheme of the power module group comprises: S311, determine the rated power of the single power module group ; S312、for each charging gun, according to its power demand Calculate the required number of power module groups ; wherein, is a ceiling function; S313, allocating the power module group for each charging gun in order from high to low according to the demand priority, and preferentially meeting the demand of the high-priority charging gun; S314, when the power module group of a single charging host is insufficient, calculating the number of module groups needed to be borrowed from other connected charging hosts.

6. The dual DC bus starling matrix control method of claim 2, wherein, Step S3 further comprises: after determining the number of required power module groups, formulating a switching scheme according to a preset switching rule, and the preset switching rule comprises: S321, for the current charging gun that has determined the required power module group quantity, preferentially put into the corresponding configuration of the power module group, realize connection through closing the contactor between the power module group and the charging terminal, and mark the power module group connected to the current charging gun as the currently held power module group, and count the number N1 of the currently held power module group; S322, judge whether the current charging gun current holding power module group N1 is greater than or equal to the required power module group quantity N of the current charging gun; if not, go to S323; if yes, execute step S4; S323, judge whether the adjacent power module group of the power module group meets the switching condition; if yes, go to step S324; if not, go to step S325; S324, put in the adjacent power module group through the ring topology contactor, mark the adjacent power module group as the currently held power module group, recalculate the current charging gun current holding power module group quantity N1, and judge whether the recalculated current holding power module group quantity N1 is greater than or equal to the required power module group quantity N of the current charging gun; if yes, execute step S4; if not, go to step S325; S325, judge whether other idle power module groups on the same DC bus as the power module group meet the switching condition; if yes, go to step S326; if not, go to step S327; S326, put in the other idle power module groups on the same DC bus that meet the switching condition through the bus contactor, mark the put-in power module group as the currently held power module group, and recalculate the current charging gun current holding power module group quantity N1; judge whether the recalculated current holding power module group quantity N1 is greater than or equal to the required power module group quantity N of the current charging gun; if yes, execute step S4; if not, go to step S327; S327, judge whether the power module group on another DC bus meets the switching condition; if yes, go to step S328; if not, go to step S329; S238, close the bus contactor corresponding to the power module group on another DC bus that meets the switching condition, put in the power module group on another DC bus that meets the switching condition through the adjacent power module group and the corresponding ring topology contactor, mark the put-in power module group as the currently held power module group, and recalculate the current charging gun current holding power module group quantity N1; judge whether the recalculated current holding power module group quantity N1 is greater than or equal to the required power module group quantity N of the current charging gun; if yes, execute step S4; if not, judge whether the system is a single charging host; if yes, generate a switching scheme according to the currently put-in power module group; if not, put in the power module group on another charging host that meets the switching condition through the parallel machine contactor, and generate a switching scheme.

7. The dual DC bus starling matrix control method of claim 6, wherein, The method for judging whether the adjacent power module group meets the switching condition in step S323 includes: judge whether the adjacent power module group is in an idle state; If idle, the adjacent power module group is put into through the ring topology contactor; If not idle, it is judged whether the charging gun of the adjacent power module group is the charging gun corresponding to the adjacent power module group, and is the charging gun corresponding to the adjacent power module group of the adjacent power module group, whether the adjacent power module group has power excess, whether the adjacent power module group is in the marked cut-out state, and whether the demand priority of the current charging gun is higher than the demand priority of the charging gun of the adjacent power module group; If the charging gun of the adjacent power module group is not the charging gun corresponding to the adjacent power module group nor the charging gun corresponding to the adjacent power module group of the adjacent power module group, and the adjacent power module group has power excess, and the adjacent power module group is not in the marked cut-out state, and the demand priority of the current charging gun is higher than the demand priority of the charging gun of the adjacent power module group, the charging gun of the adjacent power module group is cut out, and the adjacent power module group is put into through the ring topology contactor.

8. The dual DC bus starling matrix control method of claim 6, wherein, The method for judging whether other idle power module groups on the same DC bus as the power module group satisfy the switching condition in step S325 comprises: It is judged whether the DC bus on which the power module group is located is in an idle state; If idle, the DC bus is marked as in use, and other idle power module groups on the same DC bus are put into through the bus contactor; If not idle, it is judged whether the power module group occupying the DC bus is the power module group; If yes, other idle power module groups on the same DC bus are put into; If no, it is judged whether the demand priority of the power module group is higher than the demand priority of the power module group occupying the DC bus; If yes, the bus contactor corresponding to the power module group occupying the DC bus and the bus contactor corresponding to the power module group associated with the power module group are disconnected, the DC bus is cut out, all power module groups are traversed, and other idle power module groups on the same DC bus are put into; If no, go to step S327.

9. The dual DC bus starling matrix control method of claim 2, wherein, Further comprising: Before each power module group is put into, it is judged whether the power module group to be put into has a fault; If no, put into; If yes, issue an alarm.

10. A computer readable storage medium storing a computer program, characterized in that, The program is executed to implement the method of any one of claims 2-9. The program is executed to implement the method of any one of claims 2-9.

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