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

Abstract

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 of a charging pile and a storage medium, comprising: at least one charging host, each charging host being connected with 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 contactor matrix, a control unit and a plurality of power module groups, each power module group being composed of a plurality of charging modules; each charging terminal being correspondingly provided with a power module group; two direct-current buses; the contactor matrix comprising a ring topology contactor, a bus contactor and a parallel contactor; the present application reduces the number of contactors by adopting a double direct-current bus star ring matrix topology structure and a control method, and makes the charging facility have flexible expandability. The combination of the ring topology and the double direct-current bus makes the system structure more simple, and improves the reliability and maintainability of the system.

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 of a charging pile and a storage medium. BACKGROUND

[0002] In recent years, the new energy vehicle industry, as a key component of new quality productivity and a strategic emerging industry of national focus, has shown a vigorous development trend. With the 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 higher 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 pressure on power capacity expansion. However, under the current 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, which requires a large number of switches to implement the switching operation of different modules. This 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 of 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 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:

[0006] 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;

[0007] two direct-current buses;

[0008] 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 group and the double DC bus, wherein one DC bus connects all odd-numbered charging guns through the bus contactor and the power module group, and the other DC bus connects all even-numbered charging guns through the bus contactor and the power module group; and the parallel contactor is used to connect the DC bus of multiple charging hosts in a ring shape.

[0009] The control unit is used to acquire the power demand of the vehicle BMS, determine the demand priority of the charging gun, generate the switching scheme of the power module group according to the demand priority, and control the action of the contactor matrix according to the switching scheme, so as to realize the flexible distribution of the power module group.

[0010] In a second aspect, the application provides a double DC bus star ring matrix control method for a charging pile, comprising the following steps:

[0011] S1, acquiring the power demand of the vehicle BMS connected to each charging terminal;

[0012] S2, determining the demand priority of all charging guns;

[0013] 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;

[0014] S4, controlling the contactor matrix to switch the power module group according to the switching scheme;

[0015] S5, closing the DC contactor on the charging terminal and starting charging.

[0016] Further improvements of the technical solution are that in step S1, acquiring the power demand of the vehicle BMS comprises:

[0017] 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;

[0018] S12, the control unit calculates the real-time power required by the charging gun at present based on the received voltage and current data ;

[0019] S13, continuously monitoring the change of the power demand, when the SOC is in a preset interval, marking as a high power demand state and increasing the data sampling frequency.

[0020] Further improvements of the technical solution are that step S2 comprises:

[0021] S21, the charging gun is divided into two types of fast charging gun and super charging gun, and the demand priority of the super charging gun is set to be higher than that of the fast charging gun;

[0022] S22, when the charging gun types are the same, the charging guns are sorted according to the starting time, and the demand priority of the charging gun started earlier is high.

[0023] Further improvement of the technical solution is that in step S3, the switching scheme of the power module group includes:

[0024] S311, the rated power of a single power module group is determined ;

[0025] S312, for each charging gun, the required power module group number is calculated according to its power demand ; wherein, ; wherein, is a rounding up function;

[0026] S313, the power module groups are allocated to the charging guns in order of demand priority from high to low, and the demand of the high-priority charging gun is preferentially met;

[0027] S314, when the power module groups of a single charging host are insufficient, the number of module groups borrowed from other connected charging hosts is calculated.

[0028] Further improvement of the technical solution is that step S3 further includes: after determining the required power module group number, a switching scheme is formulated according to a preset switching rule, and the preset switching rule includes:

[0029] S321, for the current charging gun whose required power module group number has been determined, the corresponding configured power module group is preferentially put into the group, the connection is realized by closing the contactor between the power module group and the charging terminal, the power module group connected to the current charging gun is marked as the currently held power module group, and the number N1 of the currently held power module groups is counted;

[0030] S322, it is judged whether the currently held power module group N1 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;

[0031] S323, it is judged 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;

[0032] 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 judge 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;

[0033] S325, judge 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;

[0034] 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; judge 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;

[0035] S327, judge 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;

[0036] 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; judge 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, judge 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 improvements of the technical solution include that the method for judging whether the adjacent power module group meets the switching condition in step S323 comprises:

[0038] judge whether the adjacent power module group is in an idle state;

[0039] if idle, put in the adjacent power module group through the ring topology contactor;

[0040] 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;

[0041] 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, 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.

[0042] Further improvement of the technical solution is that 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:

[0043] It is judged whether the DC bus where the power module group is located is in an idle state;

[0044] 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;

[0045] If not idle, it is judged whether the power module group occupying the DC bus is the power module group;

[0046] If yes, other idle power module groups on the same DC bus are put into;

[0047] 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;

[0048] 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;

[0049] If not, go to step S327.

[0050] Further improvement of the technical solution further comprises:

[0051] Before each power module group is put into, it is judged whether the power module group to be put into has a fault;

[0052] If no, then proceed to input;

[0053] If yes, then issue an alarm.

[0054] In a third aspect, the present 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.

[0055] The present application has the following advantages:

[0056] Reducing cost and simplifying structure: The traditional charging pile power distribution method mainly relies on single module switching, which requires a large number of switches to realize the switching operation of different modules, resulting in high cost and complex structure. The present application significantly reduces the number of contactors used by adopting a double DC bus star ring matrix structure, thereby reducing the hardware cost. 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.

[0057] Improving switching efficiency and flexibility: The control method of the present application realizes the flexible distribution of power module groups by obtaining vehicle BMS demand, determining charging gun demand priority, and generating switching scheme of power module groups according to these information. Compared with the traditional method, the present application 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 structure makes the power module groups can be flexibly called between different charging guns, further enhancing the flexibility of the system.

[0058] Enhancing 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 and is difficult to meet the demand of large-scale charging station. The present application realizes the DC bus ring connection of multiple charging hosts through parallel machine 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 to the ring topology through the parallel machine contactor, without the need to replace the equipment on a large scale, significantly reducing the upgrade cost.

[0059] Optimizing resource utilization and reducing waste: The present application realizes the efficient use of power resources by real-time monitoring the power demand of charging guns and dynamically adjusting the distribution of power module groups 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, improving the overall operation efficiency of the charging station.

[0060] The control method of the application can strictly detect faults before the power module group is put into use, so as to ensure that only the power module group without faults can be put into use. This mechanism effectively avoids the problem of system collapse caused by power module faults, and 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 simultaneously demand power, and avoid system conflicts caused by resource contention. BRIEF DESCRIPTION OF DRAWINGS

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0062] Figure 1 Connection diagram of a single charging host in the control system.

[0063] Figure 2 Connection diagram of double charging hosts in the control system.

[0064] Figure 3 Connection diagram of multiple charging hosts in the control system.

[0065] Figure 4 Schematic flowchart of the method of one embodiment of the application.

[0066] 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

[0067] In order to make the purpose, features and advantages of the application more obvious and easy to understand, the technical solutions in the application will be clearly and completely described below in combination with the drawings in the specific embodiments. Obviously, the following described embodiments are only some of the embodiments of the application, but not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without any creative effort are within the scope of protection of the application.

[0068] 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 application belongs. The terms used in the specification of the application are only for the purpose of describing the specific embodiments and are not intended to limit the application.

[0069] As Figure 1 , Figure 2 and Figure 3As shown, the application provides a double direct current bus star ring matrix control system of a charging pile, comprising at least one charging host, each charging host being connected with at least two charging terminals, each charging terminal comprising at least one charging gun and each charging gun being numbered; each charging host comprising:

[0070] 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;

[0071] two direct current buses;

[0072] a contactor matrix comprising a ring topology contactor, a bus contactor and a parallel contactor; the ring topology contactor being used to connect all the power module groups in a ring topology; the bus contactor being used to realize the connection between the power module groups and the double direct current buses, wherein one direct current bus connects all the charging guns numbered with odd numbers through the bus contactor and the power module groups, and the other direct current bus connects all the charging guns numbered with even numbers through the bus contactor and the power module groups; the parallel contactor being used to realize the ring connection of the direct current buses of the plurality of charging hosts;

[0073] a control unit being used to acquire the power demand of the vehicle BMS, determine the demand priority of the charging gun, generate a switching scheme of the power module group according to the demand priority and control the action of the contactor matrix according to the switching scheme to realize the flexible distribution of the power module group.

[0074] Specifically, the application comprises a double direct current bus and a ring topology structure, one of the two direct current buses connects all the charging guns numbered with odd numbers to one bus, and the other direct current bus connects all the charging guns numbered with even numbers to one bus, and all the 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 the power module groups are connected through the contactor matrix, each charging module group is connected with the corresponding charging terminal, and each charging terminal can flexibly call the charging modules of the whole machine through the double direct current buses and the ring topology structure of the outer ring to realize efficient and high-power charging.

[0075] Figure 4 is a schematic flowchart of the method of an embodiment of the application. Wherein, Figure 4 The execution subject can be a double direct current bus star ring matrix control system of a charging pile. The order of the steps in the flowchart can be changed according to different demands, and some steps can be omitted.

[0076] As shown in the figure, Figure 4 The method comprises:

[0077] S1, acquiring the power demand of the vehicle BMS connected with each charging terminal;

[0078] S2. Determine the priority of all charging gun requirements;

[0079] S3. Based on the power requirements of the vehicle BMS, the power capacity of each power module group, and the priority of the charging gun, calculate the switching scheme of the power module group.

[0080] S4. Control the contactor matrix to switch power module groups according to the switching scheme;

[0081] S5. Close the DC contactor on the charging terminal to start charging.

[0082] To facilitate understanding of the present invention, the following description further illustrates the dual DC bus star-ring matrix control method for charging piles provided by the present invention, based on the principle of the dual DC bus star-ring matrix control method for charging piles and the process of performing dual DC bus star-ring matrix control on charging piles in the embodiments.

[0083] First, in step S1, obtaining the power requirements of the vehicle's BMS includes:

[0084] S11. The charging terminal establishes a connection with the vehicle BMS through the communication interface and receives the target voltage, maximum allowable current and current SOC value sent by the BMS in real time.

[0085] S12. Based on the received voltage and current data, the control unit calculates the real-time power required by the charging gun. ;

[0086] 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.

[0087] Secondly, step S2 includes:

[0088] 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.

[0089] 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.

[0090] Next, in step S3, the power module switching scheme is calculated as follows:

[0091] S311. Determine the rated power of a single power module group. ;

[0092] S312. For each charging gun, according to its power requirements... Calculate the required number of power module groups ;in, It is a rounding function;

[0093] S313, allocate power module groups to each charging gun in order of demand priority from high to low, and preferentially meet the demand of high-priority charging guns;

[0094] S314, when the power module groups of a single charging host are insufficient, calculate the number of module groups that need to be borrowed from other connected charging hosts.

[0095] Further, step S3 further comprises: after determining the required power module group number, formulating a switching scheme according to a preset switching rule, and the preset switching rule comprises:

[0096] S321, for the current charging gun whose required power module group number has been determined, preferentially input the corresponding configured power module group, realize connection by closing the contactor between the power module group and the charging terminal, 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 groups;

[0097] S322, judge 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;

[0098] 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;

[0099] S324, input 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 number N1 of the currently held power module groups of the current charging gun, and judge 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;

[0100] S325, judge whether the other idle power module group on the same DC bus as the power module group meets the switching condition; if yes, go to step S326; if not, go to step S327;

[0101] S326, input the other idle power module group on the same DC bus that meets the switching condition through the bus contactor, mark the input power module group as the currently held power module group, recalculate the number N1 of the currently held power module groups of the current charging gun, and judge 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 S327;

[0102] S327, determining whether the power module group on the other DC bus meets the switching condition; if yes, going to step S328; if no, going to step S329;

[0103] S238, closing the bus contactor corresponding to the power module group on the other DC bus that meets the switching condition, putting the power module group on the other DC bus that meets the switching condition through the adjacent power module group and the corresponding ring topology contactor, marking the put-in power module group as the current held power module group, and recalculating the current held power module group number N1 of the current charging gun; determining 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, executing step S4; if no, determining whether the system is a single charging host; if yes, generating a switching scheme according to the current put-in power module group; if no, putting the power module group on the other charging host that meets the switching condition through the parallel connection contactor, and generating a switching scheme.

[0104] Further, the method for determining whether the adjacent power module group meets the switching condition in step S323 comprises:

[0105] determining whether the adjacent power module group is in an idle state;

[0106] if idle, putting the adjacent power module group through the ring topology contactor;

[0107] if not idle, determining whether the charging gun occupying 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 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 occupying the adjacent power module group;

[0108] if the charging gun occupying the adjacent power module group is neither 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 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 occupying the adjacent power module group, the charging gun occupying the adjacent power module group is cut out, and the adjacent power module group is put in through the ring topology contactor.

[0109] Further, the method for determining whether the other idle power module group on the same DC bus as the current power module group meets the switching condition in step S325 comprises:

[0110] Judge whether the DC bus where the power module group is located is in an idle state or not;

[0111] If it is idle, mark the DC bus as in use, and put other idle power module groups on the same DC bus into operation through the bus contactor;

[0112] If it is not idle, judge whether the power module group occupying the DC bus is the power module group;

[0113] If yes, put other idle power module groups on the same DC bus into operation;

[0114] If no, judge whether the demand priority of the power module group is higher than that of the power module group occupying the DC bus;

[0115] If yes, disconnect 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, and cut off the DC bus; traverse all power module groups, and put other idle power module groups on the same DC bus into operation;

[0116] If no, go to step S327.

[0117] In addition, the method further comprises:

[0118] Before each power module group is put into operation, judge whether the power module group to be put into operation has a fault or not;

[0119] If no, put into operation;

[0120] If yes, issue an alarm.

[0121] The purpose of the present application is to overcome the shortcomings of poor flexibility or high cost of the existing charging stack switching technology, and 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 charging hosts to realize high-power charging function.

[0122] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0123] The double bus star ring topology in the application has single machine high power output and multi-machine parallel operation modes. In single machine mode, the charger is composed of double DC buses and 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 transferred 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 the corresponding charging terminal. Each charging terminal can flexibly call the charging modules of the whole machine through the double DC buses and the ring topology structure of the outer ring to achieve efficient and high-power charging. In multi-machine parallel operation mode, the DC buses of two or more charging machines are connected in a ring. The topology is shown in the drawing. The application is taken as an example of two groups of one machine twelve charging devices and three groups of one machine twelve charging devices. As shown in Figure 2 and Figure 3 , in actual application, multiple groups of different chargers can be composed, and the charger is not limited to one machine eight charging. It can be expanded to one machine multiple charging.

[0124] The topology structure in the example is a typical case of double machine parallel connection, as shown in Figure 2 . The numbers in the box represent the power module group number, the number with a hash symbol represents the charging gun number, and k with a number represents the contactor number. Each contactor contains one positive contactor and one negative contactor. The contactor with the number k9n is a DC bus parallel contactor, and the contactor with the number kn-k3n is a contactor in the power routing.

[0125] The module group of each gun port (i.e. charging gun) forms a ring topology through the contactor. The system has two buses, which respectively connect the odd module group (1, 3, 5, 7...) and the even module group (2, 4, 6, 8...), forming a star topology. Multiple back-end machines can be connected through the two buses. Any gun has three input circuits, which are the left side of the ring, the right side of the ring and the connected bus. 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 charger, 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 occupied power module groups is the power module group, the idle adjacent power module group, the other idle module group on the idle bus, and the other idle module group.

[0126] The charging pile product is composed of a charger 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 charger is composed of a power AC bus, a charging module and a power routing (composed of a contactor matrix, and the contactor is controlled according to a control strategy to distribute the charging module groups to the contactor matrix of each charging terminal), and the charger schedules the power module according to the power demand of the charging terminal through the power routing to provide energy for the charging terminal.

[0127] The double-bus star ring topology in the application has single-machine high-power output and multi-machine parallel operation modes. In the single-machine mode, the charger is composed of double DC buses 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 distributed 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 machines are connected in a ring shape. This example takes a 12-machine topology as an example. In actual application scenarios, 4, 6, 8, 10, 12, 16 and other configuration modes can be configured according to requirements.

[0128] Double DC bus star ring system control method:

[0129] 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 charger, controlling the contactor matrix to switch the power unit, and closing the DC contactor of the charging terminal to start charging.

[0130] After starting charging, the order of occupying the power module group is as follows: the current power module, the idle adjacent power module group, the other idle module group on the idle bus, and the other idle module group.

[0131] Taking starting charging with any gun as an example, the default is to use the current module, that is, module group 1. When the demand increases, the bus tie is closed, and the left module group 12 is put into operation. When the demand continues to increase, the bus tie is closed, and the right module group 2 is put into operation. When the demand continues to increase, the bus tie is closed, and the idle module groups (3, 5, 7, 9, 11) on the bus are put into operation. When the demand continues to increase, the other idle module groups (4, 6, 8, 10) are put into operation.

[0132] Assuming charging, gun 1 occupies all idle modules at the back end (host), after demand decreases, if the high priority gun performs preemption action, release other module groups first; then release bus module group, then release adjacent module group; finally release the module group. The specific algorithm execution steps are as follows:

[0133] Step 1: Check if there is a charging gun, if not, exit the current round of inspection, if so, continue with the following steps.

[0134] Step 2: For the current charging gun, sort the fast charging gun and the super charging gun according to the order of successful start charging.

[0135] Step 3: Sort each group according to the frequency of module use from low to high.

[0136] Step 4: According to the start order table, traverse each charging gun, compare the number of modules N required to start based on the best output at the current charging voltage with the number of modules N1 currently held, if N is equal to N1, no processing is required.

[0137] Step 5: If N is less than N1, no processing is required.

[0138] Step 6: If N is greater than N1, execute the following loop steps.

[0139] Step 7: Determine if the current gun's N is greater than N1, if not, no processing is required, continue to search for other guns, if so, check if the adjacent module is idle, if idle, mark the adjacent module's belonging gun as the current gun, recalculate N1, if the module is idle, trigger the module to be put into (adjacent module, current gun), jump to step 7, if not idle, determine if the adjacent module's belonging gun is not the current gun and not the gun, the power is excessive and not in the cutout state, or the current gun has a higher priority, trigger the module to be cut out (adjacent module, corresponding gun), continue to search for other guns, otherwise, jump to step 8.

[0140] 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 the adjusting state, 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.

[0141] 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.

[0142] Step 10: In all the above 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 complete charging.

[0143] 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.

[0144] 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:

[0145] 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?

[0146] If the DC bus is idle, mark it as in use to avoid charging conflicts;

[0147] 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.

[0148] If so, then other idle power module groups on the same DC bus will be put into operation;

[0149] 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;

[0150] 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).

[0151] 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.

[0152] 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 each embodiment 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.

[0153] 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 each embodiment of the application.

[0154] 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, It includes at least one charging host, each charging host is connected to at least two charging terminals, each charging terminal includes at least one charging gun (110), and each charging gun (110) is numbered; each charging host includes: Several power module groups (120), each power module group (120) consists of multiple charging modules; each charging terminal is configured with one power module group (120). Two DC buses (130); The contactor matrix includes a ring topology contactor (141), a bus contactor (142), and a parallel contactor. The ring topology contactor (141) is used to connect all power module groups (120) end to end to form a ring topology. The bus contactor (142) is used to connect the power module groups (120) to the dual DC buses (130). One DC bus connects all odd-numbered charging guns (110) to the power module groups (120) through the bus contactor (142), and the other DC bus connects all even-numbered charging guns (110) to the power module groups (120) through the bus contactor (142). The parallel contactor is used to realize the ring connection of the DC buses (130) of multiple charging hosts. The control unit is used to acquire vehicle BMS requirements, determine the demand priority of charging gun (110), generate a switching scheme for power module group (120) based on the demand priority, and control the contactor matrix to operate according to the switching scheme, so as to realize the flexible allocation of power module group (120). After charging is started, the order in which power module groups are occupied is as follows: power module in this group, adjacent idle power module group, other idle power module group on the same DC bus, power module group on another DC bus, and power module group on another charging host.

2. A control method for a dual DC bus star-ring matrix control system for a charging pile as described in claim 1, characterized in that, include: S1. Obtain the power requirements of the vehicle BMS connected to each charging terminal. S2. Determine the priority of all charging gun requirements; S3. Based on the power requirements of the vehicle BMS, the power capacity of each power module group, and the priority of the charging gun, calculate the switching scheme of the power module group. S4. Control the contactor matrix to switch power module groups according to the switching scheme; S5. Close the DC contactor on the charging terminal to start charging.

3. The control method according to claim 2, characterized in that, In step S1, obtaining the power requirements of the vehicle's BMS includes: S11. The charging terminal establishes a connection with the vehicle BMS through the communication interface and receives the target voltage, maximum allowable current and current SOC value sent by the BMS in real time. S12. Based on the received voltage and current data, the control unit calculates the real-time power required by the charging gun. ; 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.

4. The control method according to claim 2, characterized in that, 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.

5. The control method according to claim 3, characterized in that, 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.

6. The control method according to claim 2, characterized in that, Step S3 further 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. Connect 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 number N1 of the currently held power module groups of the current charging gun, and determine whether the recalculated number N1 of the currently held power module groups is greater than or equal to the number N of the required power module groups of the current charging gun; if yes, proceed to step S4; if no, go to step S325. S325. Determine whether other idle power module groups on the same DC bus as this power module group meet the switching conditions; if yes, proceed to step S326; if no, proceed to step S327. S326. Connect other idle power module groups that meet the switching conditions on the same DC bus through the bus contactor, and mark the connected power module groups as the currently held power module groups. Recalculate the number of power module groups N1 currently held by the current charging gun. Determine whether the recalculated number of power module groups N1 currently held is greater than or equal to the number of power module groups N required by the current charging gun. If yes, proceed to step S4; if no, go to step S327. S327. Determine whether the power module group on the other DC bus meets the switching conditions; if yes, proceed to step S328; if no, proceed to step S329. S238. Close the bus contactor corresponding to the power module group that meets the switching conditions on another DC bus. Activate the power module group that meets the switching conditions on the other DC bus via the adjacent power module group and the corresponding ring topology contactor. Mark the activated power module group as the currently held power module group. Recalculate the number N1 of power module groups currently held by the current charging gun. Determine whether the recalculated number N1 of currently held power module groups is greater than or equal to the required number N of power module groups for the current charging gun. If yes, proceed to step S4. If no, determine whether the system is a single charging host. If yes, generate a switching scheme based on the currently activated power module group. If no, activate the power module group that meets the switching conditions on another charging host via the parallel contactor and generate a switching scheme.

7. The control method according to claim 6, characterized in that, The method for determining whether adjacent power module groups meet the switching conditions in step S323 includes: Determine if the adjacent power module group is in an idle state; If idle, the adjacent power module group is activated via a ring topology contactor; If not idle, determine whether the charging gun occupying the adjacent power module group is the charging gun configured for the adjacent power module group, whether the adjacent power module group has power surplus, 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 the adjacent power module group is not the charging gun configured for the adjacent power module group, nor is it the charging gun configured for the adjacent power module group, and the adjacent power module group has excess power, and the adjacent power module group is not marked as being switched out, and the current charging gun's demand priority is higher than the demand priority of the charging gun occupying the adjacent power module group, then the charging gun occupying the adjacent power module group will be switched out, and the adjacent power module group will be put into operation through the ring topology contactor.

8. The control method according to claim 6, characterized in that, The method for determining whether other idle power module groups on the same DC bus as this power module group meet the switching conditions in step S325 includes: Determine whether the DC bus where this power module group is located is in an idle state; If the bus is idle, mark it as in use and activate other idle power module groups on the same DC bus via the bus contactor. If it is not idle, then determine whether the power module group occupying the DC bus is the same power module group in this group; 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 this power module group is higher than the demand priority of the power module group occupying the DC bus. If so, disconnect 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 that power module group, and disconnect the DC bus; traverse all power module groups and put other idle power module groups on the same DC bus into operation. If not, proceed to step S327.

9. The control method according to claim 2, characterized in that, Also includes: Before each power module group is put into operation, it is determined whether the power module group to be put into operation has any faults. If not, then proceed with the investment; If so, an alarm will be triggered.

10. A computer-readable storage medium storing a computer program, characterized in that, When the program is executed, it implements the method as described in any one of claims 2-9.

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