Cluster charging station

Abstract

The utility model discloses a cluster charging station, which is used in the technical field of charging and comprises a plurality of charging stations, each charging station comprises a power supply input end and a power supply output end, and the power supply input ends are connected with the power supply output ends; wherein the power supply input ends of the plurality of charging stations are connected with the plurality of charging stations, so that electric energy transmission can be realized, the plurality of charging stations can share input electric energy and are not limited by the capacity of a transformer of a public power grid any more, the charging power of the charging stations is improved, and high-power charging is realized; and the energy of each charging station in the cluster charging station is interconnected, so that the charging performance and the charging efficiency can be further ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging, and more particularly, to a cluster charging station. BACKGROUND

[0002] In the charging process, the maximum charging power that a charging pile can provide is an important reason affecting the charging speed of an electric vehicle. The maximum charging power of a charging pile is generally limited by the power grid structure. If the maximum charging power of a charging pile is to be improved by changing the power grid structure, a high cost and time are usually required, and it is difficult to change.

[0003] Therefore, how to improve the output power of a charging pile under the existing power grid structure is a problem that needs to be solved in the field. CONTENT OF THE INVENTION

[0004] Therefore, the embodiments of the present application provide a cluster charging station. The output power of the charging station can be provided.

[0005] The cluster charging station of the present application comprises: a plurality of charging stations, the charging station comprising a power input end and a power output end, the power input end, a voltage-lifting and voltage-lowering circuit, a contactor matrix, and the power output end being connected in sequence; wherein the power input ends of the plurality of charging stations are connected.

[0006] In some embodiments, a connection line is arranged between two of the charging stations connected by the power input end.

[0007] In some embodiments, further comprising: a circuit breaker arranged in the connection line, the circuit breaker being used to control the on-off of the connection line.

[0008] In some embodiments, the cluster charging station further comprises a dispatching controller, the dispatching controller being used to control the on-off of each of the circuit breakers based on the topological relationship of the plurality of charging stations, so that the output power of a target charging station reaches a corresponding set power, the target charging station comprising one or more charging stations having a charging demand.

[0009] In some embodiments, the power input end of the charging station is connected to a public power grid.

[0010] In some embodiments, the charging station comprises a transformer arranged between the public power grid and the power input end, the transformer being used to adjust the voltage input to the power input end.

[0011] In some embodiments, the charging station further comprises a rectifier for converting between alternating current and direct current, the power input is connected to an alternating side or a direct side of the rectifier; the rectifier is connected to the transformer and the power input respectively; or the rectifier is connected to the power input and the power output respectively.

[0012] In some embodiments, the rectifier comprises a bidirectional rectifier.

[0013] In some embodiments, the charging station comprises at least one of a power generation device and an energy storage device, and the power input of the charging station is connected to at least one of the public power grid, the power generation device and the energy storage device.

[0014] In some embodiments, the power inputs of the plurality of charging stations are connected in a ring or in a star.

[0015] In some embodiments, the plurality of charging stations are divided into groups, and the power inputs of the charging stations in each group are connected in a ring or in a star.

[0016] In some embodiments, the charging station further comprises a plurality of charging piles, and the power output is arranged in the charging piles.

[0017] In some embodiments, the charging station further comprises a contactor matrix and a voltage-lifting and voltage-lowering circuit, and the power input, the voltage-lifting and voltage-lowering circuit, the contactor matrix and the power output are connected in sequence, the voltage-lifting and voltage-lowering circuit is used to adjust the voltage input to the contactor matrix from the power input or the voltage input to the power input from the contactor matrix, the contactor matrix comprises a plurality of contactors, and the contactor matrix is used to adjust the combination relationship of the plurality of contactors to adjust the output power of each power output.

[0018] The cluster charging station of the embodiments of the present application comprises a plurality of charging stations, each charging station comprising a power input and a power output, and the power input, a voltage-lifting and voltage-lowering circuit, a contactor matrix and the power output are connected in sequence; wherein the power inputs of the plurality of charging stations are connected, the plurality of charging stations can realize energy transmission therebetween, and the plurality of charging stations can share the input energy, which is no longer limited by the capacity of the transformer of the public power grid, thereby improving the charging power of the charging station and realizing high-power charging; the energy of each charging station in the cluster charging station is interconnected, which can further ensure the charging performance and the charging efficiency.

[0019] Additional aspects and advantages of the embodiments of the present application will be in part apparent and in part pointed out hereinafter in the description of the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings in which:

[0021] Figure 1 is a structural schematic diagram of a cluster charging station according to certain embodiments of the present application;

[0022] Figure 2 is a structural schematic diagram of a cluster charging station according to certain embodiments of the present application;

[0023] Figure 3 is a structural schematic diagram of a cluster charging station according to certain embodiments of the present application;

[0024] Figure 4 is a structural schematic diagram of a cluster charging station according to certain embodiments of the present application;

[0025] Figure 5 is a scenario diagram of a dispatch controller in use of a cluster charging station according to certain embodiments of the present application;

[0026] Figure 6 is a ring connection schematic diagram of a cluster charging station according to certain embodiments of the present application;

[0027] Figure 7 is a star connection schematic diagram of a cluster charging station according to certain embodiments of the present application. DETAILED DESCRIPTION

[0028] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals and letters throughout the several views denote the same or like elements or components. The embodiments described below are merely examples for explaining the embodiments of the present application, and are not intended to limit the embodiments of the present application.

[0029] In the present application, unless specifically stated and limited otherwise, a first feature "on", "above", or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, the first feature "over", "above", and "on" the second feature can be directly above or obliquely above the second feature, or simply means that the first feature is higher in horizontal level than the second feature. The first feature "under", "below", and "underneath" the second feature can be directly below or obliquely below the second feature, or simply means that the first feature is lower in horizontal level than the second feature.

[0030] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implying a specific number of technical features indicated. Therefore, the features defined as "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include at least one feature. In the description of the present application, the meaning of "plurality" is at least two, for example, two, three, unless otherwise explicitly and specifically limited.

[0031] During the charging process, the maximum charging power that the charging pile can provide is an important reason affecting the charging speed of the electric vehicle. The maximum charging power of the charging pile is generally limited by the power grid structure. If the maximum charging power of the charging pile is to be improved by changing the power grid structure, it usually requires high cost and time, and it is difficult to change.

[0032] Therefore, how to improve the output power of the charging pile under the existing power grid structure is a problem that needs to be solved in the field.

[0033] The cluster charging station provided by the present application is described in detail below.

[0034] The present application provides a cluster charging station 1000, please refer to Figure 1 The cluster charging station 1000 comprises:

[0035] A plurality of charging stations, the charging station comprising a power input end and a power output end, the power input end, the voltage lifting and lowering circuit, the contactor matrix and the power output end are connected in sequence; wherein the power input ends of the plurality of charging stations are connected.

[0036] Among them, the charging station can be a charging system with charging function, which is used to provide electric energy for charging equipment (such as electric vehicles, etc.). After the charging station obtains electric energy (for example, from the power grid), the electric energy is provided to the charging equipment to charge the charging equipment.

[0037] Among them, the power input end can be the port of the charging station to obtain electric energy, for example, the power input end can be one end of the charging station connected to the power grid.

[0038] Among them, the power output end can be the port of the charging station to provide electric energy to the charging equipment.

[0039] Optionally, the charging station further comprises a plurality of charging piles, and the power output end is arranged in the charging pile.

[0040] Among them, the power output end is arranged in the charging pile, and the charging pile can be connected with the charging equipment. For example, the charging pile can be connected with the electric vehicle, and the power output end arranged on the charging pile is used to charge the electric vehicle.

[0041] Specifically, the cluster charging station comprises a plurality of charging stations (for example, please refer to Figure 1The cluster charging station 1000 includes n charging stations, i.e., charging station 101, charging station 102, …, and charging station 10n. Each charging station has an independent charging function by grouping multiple charging stations into a cluster charging station. The charging station has a power input end (for example, please refer to Figure 1 The charging station 101 includes a power charging end 11) to obtain power from an energy system (for example, please refer to Figure 1 The energy system includes a 10 kilovolt (kv) public power grid, etc.) and a power output end (for example, please refer to Figure 1 The charging station 101 includes a power charging end 21) to transmit power to a charging device to realize the charging function of the charging station. Since the maximum power output from the public power grid to the charging station is generally determined based on the capacity of the transformer in the previous stage, by connecting the power input ends of multiple charging stations, power transmission can be realized between multiple charging stations, and multiple charging stations can share the input power, which is no longer limited by the capacity of the transformer in the public power grid, thereby improving the charging power of the charging station and realizing high-power charging.

[0042] For example, the power input ends of each charging station can be connected to different power supply devices. To ensure the output charging power, in the case that there are many charging devices loaded in any charging station, power can be obtained from other idle charging stations based on the connection of the power input ends of multiple charging stations, thereby ensuring the charging power of the charging pile.

[0043] For another example, in the case that there is no power input in any charging station, power can be provided to the charging station by other charging stations based on the connection of the power input ends of multiple charging stations, thereby realizing energy interconnection and ensuring charging performance and charging efficiency.

[0044] In this way, the cluster charging station includes multiple charging stations, and each charging station includes a power input end and a power output end, and the power input end, the voltage conversion circuit, the contactor matrix, and the power output end are connected in sequence. The power input ends of multiple charging stations are connected, power transmission can be realized between multiple charging stations, multiple charging stations can share the input power, which is no longer limited by the capacity of the transformer in the public power grid, thereby improving the charging power of the charging station and realizing high-power charging. The energy of each charging station in the cluster charging station is interconnected, which can further ensure the charging performance and charging efficiency.

[0045] Please refer to Figure 1 In some embodiments, a connection circuit is arranged between two charging stations connected by the power input end.

[0046] Specifically, the connection circuit can connect the power input ends of two charging stations. For example, please refer to Figure 1A connection line 31 is arranged between the power input 11 of the charging station 101 and the power input 12 of the charging station 102. The charging station can obtain or share the input power of other charging stations based on the connection circuit, thereby improving the overall power supply efficiency.

[0047] For example, continuing the previous example, when the charging station 101 has a heavy load and the charging station 102 has no load (i.e., power redundancy), the excess power of the charging station 102 can be input to the charging station 101 through the connection line 31, thereby increasing the output power of the charging station 101.

[0048] In some embodiments, the power input of the charging station is connected to a public power grid.

[0049] For example, referring to Figure 1 The power input 11 of the charging station 101 is connected to a 10kv public power grid.

[0050] Optionally, the charging station comprises a transformer arranged between the public power grid and the power input, and the transformer is configured to adjust the voltage input to the power input.

[0051] Specifically, one end of the transformer is connected to the public power grid, and the other end is connected to the power input. The transformer can adjust the high voltage in the public power grid (for example, reduce the high voltage in the public power grid to a low voltage suitable for the charging station), so that the voltage input to the charging station from the power input of the charging station meets the voltage requirement of the charging station, avoids damaging the charging station or damaging the charging device, and improves the charging safety.

[0052] For example, referring to Figure 1 For example, the voltage of the public power grid is 10kv. The transformer 41 is arranged between the public power grid and the power input 11 of the charging station 101. The transformer 41 can adjust the high voltage 10kv in the public power grid to 400 volts (V) that meets the voltage requirement of the charging station.

[0053] Optionally, the charging station further comprises a rectifier configured to convert between alternating current and direct current, and the power input is connected to the alternating current side or the direct current side of the rectifier.

[0054] The rectifier comprises a bidirectional rectifier, i.e., the rectifier can convert direct current to alternating current, and can also convert alternating current to direct current.

[0055] The rectifier can comprise one or more, and the rectifier can also be a plurality of alternating current-direct current (AC-DC) conversion modules connected in parallel.

[0056] Specifically, in the public power grid, power is usually transmitted in the form of alternating current (AC), while charging devices (for example, electric vehicles) generally need direct current for charging. By setting a rectifier, the alternating current of the public power grid can be converted into direct current for the charging station to use, thereby realizing high-power charging.

[0057] Alternatively, the two ends of the rectifier are connected to the transformer and the power input end, respectively; or the two ends of the rectifier are connected to the power input end and the power output end, respectively.

[0058] Specifically, the transformer is arranged between the public power grid and the power input end, and the two ends of the rectifier are connected to the transformer and the power input end, respectively; or the two ends of the rectifier are connected to the power input end and the power output end, respectively, that is, the transformer, the rectifier, the power input end and the power output end can be connected in sequence; or the transformer, the power input end, the rectifier and the power output end can be connected in sequence, and the charging stations can realize energy interaction through alternating current.

[0059] When each charging station is connected through the power input end, direct interconnection on the direct current side can be realized, thereby realizing more efficient energy transmission. For example, please refer to Figure 2 In the charging station 101, one end of the rectifier 51 is connected to the transformer 41, and the other end is connected to the power input end 11. In the charging station 102, one end of the rectifier 52 is connected to the transformer 42, and the other end is connected to the power input end 12. When the charging station 101 and the charging station 102 are connected through the connection circuit 31 to connect the power input end 11 and the power input end 12, direct interconnection on the direct current side can be realized.

[0060] The power of the public power grid is adjusted in voltage by the transformer before entering the rectifier, thereby avoiding damage to the rectifier due to high voltage. In addition, the transformer can also provide electrical isolation for the rectifier, thereby reducing the impact on the charging station in case of failure. After the alternating current is converted into direct current by the rectifier, the direct current is input into the power input end for use by the charging station, thereby improving the stability and safety of the cluster charging pile.

[0061] When each charging station is connected through the power input end, direct interconnection on the alternating current side can be realized, there are no isolation type electrical components, the interconnection efficiency of the charging station is improved, and the design of the cluster charging pile can be simplified, thereby improving the efficiency of charging or power supply and better meeting the needs of charging devices. For example, please refer to Figure 3 In the charging station 101, one end of the rectifier 51 is connected to the power input end 11, and the other end is connected to the power output end 21. In the charging station 102, one end of the rectifier 52 is connected to the power input end 12, and the other end is connected to the power output end 22. When the charging station 101 and the charging station 102 are connected through the connection circuit 31 to connect the power input end 11 and the power input end 12, direct interconnection on the alternating current side can be realized.

[0062] Optionally, the charging station comprises at least one of a power generation device and an energy storage device, and the power supply input of the charging station is connected to at least one of the public power grid, the power generation device and the energy storage device.

[0063] The power generation device can be, for example, a photovoltaic power generation device, a hydroelectric generator, a wind turbine, etc. For example, please refer to Figure 1 In the charging station 101, the charging station 101 comprises a photovoltaic power generation device 61 and an energy storage device 71.

[0064] Specifically, the power supply input of the charging station can be connected to at least one of the public power grid, the power generation device and the energy storage device. For example, the power supply input of the charging station can be connected to the public power grid; or the power supply input of the charging station can be connected to the public power grid and the energy storage device; or the power supply input of the charging station can be connected to the power generation device and the energy storage device; or the power supply input of the charging station is connected to the public power grid, the power generation device and the energy storage device, which is not limited in the present application, and will not be listed one by one here.

[0065] Taking the power supply input of the charging station connected to the public power grid, the power generation device and the energy storage device as an example, the energy storage device can be used as an energy storage device. When the power of the public power grid is sufficient, the energy storage device can be charged through the public power grid. When the power of the public power grid is insufficient, in order to ensure the output power of the charging station, the energy storage device can be discharged to supplement the power. In addition, the charging and discharging working conditions of the energy storage device can also be set according to the peak price and valley price of the public power grid. For example, when the current time is the peak price of the public power grid, the energy storage device is discharged to supply power to the power supply output of the charging station; when the current time is the valley price of the public power grid, the energy storage device is charged to reserve power for subsequent use. Taking the power generation device as a photovoltaic power generation device as an example, the photovoltaic power generation device can convert solar energy into electrical energy. The electrical energy generated by the photovoltaic power generation device can be stored in the energy storage device, or output to the power supply output to charge the charging device, or inverted to the public power grid.

[0066] Optionally, the cluster charging station further comprises:

[0067] The circuit breaker is arranged on the connection line, and the circuit breaker is used to control the on-off of the connection line.

[0068] Specifically, please refer to Figure 1 The charging station 101 and the charging station 102 are connected through the connection line 31, and the circuit breaker 81 is arranged on the connection line 31. The circuit breaker 81 can control the connection or disconnection of the connection line 31.

[0069] By setting the circuit breaker, the isolation between each charging station can be ensured. For example, in the case of any charging station failure, the connection line of the charging station can be switched by the circuit breaker to avoid affecting other charging stations.

[0070] For example, please refer to Figure 1 In the charging station 101, one end of the rectifier 51 is connected to the transformer 41, and the other end is connected to the power input end 11. In the charging station 102, one end of the rectifier 52 is connected to the transformer 42, and the other end is connected to the power input end 12. The charging station 101 and the charging station 102 are connected through the connection line 31, and the circuit breaker 81 is arranged on the connection line 31. The circuit breaker 81 can control the connection line 31 to be connected or disconnected, so that the charging station 101 and the charging station 102 are isolated and interconnected on the DC side.

[0071] For another example, please refer to Figure 4 In the charging station 101, one end of the rectifier 51 is connected to the power input end 11, and the other end is connected to the power output end 21. In the charging station 102, one end of the rectifier 52 is connected to the power input end 12, and the other end is connected to the power output end 22. The charging station 101 and the charging station 102 are connected through the connection line 31, and the circuit breaker 81 is arranged on the connection line 31. The circuit breaker 81 can control the connection line 31 to be connected or disconnected, so that the charging station 101 and the charging station 102 are isolated and interconnected on the AC side.

[0072] In this way, each charging station in the cluster charging station of the present application can be connected through the connection mode of non-isolated interconnection on the DC side (please refer to Figure 2 ), isolated interconnection on the DC side (please refer to Figure 1 ), non-isolated interconnection on the AC side (please refer to Figure 3 ), and isolated interconnection on the AC side (please refer to Figure 4 ).

[0073] In some embodiments, the cluster charging station 1 further comprises a scheduling controller. The scheduling controller controls the on-off of each circuit breaker based on the topological relationship of the plurality of charging stations, so that the output power of the target charging station reaches the corresponding set power. The target charging station includes one or more charging stations with charging demand.

[0074] For example, please refer to Figure 5 The cluster charging station 1000 further comprises a scheduling controller 200. The scheduling controller 200 can control the on-off of each circuit breaker based on the topological relationship of the plurality of charging stations (for example, control the circuit breaker 81 to be disconnected, etc.).

[0075] Specifically, the power of the cluster charging station can be scheduled by the scheduling controller to realize the mutual transmission of energy between the charging station and the power grid system, and the monitoring and control of the cluster charging station. The scheduling controller can access the data acquisition and monitoring control system (SCADA) of the public power grid to participate in the primary frequency modulation and secondary frequency modulation of the public power grid. For example, when the power generation capacity of the power generation equipment of the cluster charging station is large enough, the cluster charging station can participate in the primary frequency modulation of the public power grid; when the power generation equipment and the energy storage system of the cluster charging station can provide enough power, the scheduling controller can send the standby capacity of the cluster charging station and the installed capacity of the charging station to the SCADA system for unified scheduling by the public power grid to participate in the secondary frequency modulation of the public power grid.

[0076] Optionally, in a single charging station, the control systems of the power generation equipment, the energy storage equipment and other modules can interact with the controller of the charging station (for example, please refer to Figure 5 , the control systems of the power generation equipment 61, the energy storage equipment 71, the rectifier 51, the power module 91 and the interconnection module 92 can interact with the controller 10 of the charging station 101), and then the controller of the single charging station communicates with the scheduling controller to realize control.

[0077] Optionally, the scheduling controller can obtain and update the device information and the device state information of each charging station in the cluster charging station in real time to calculate the power of each charging station, the available power and the standby power of each charging station, the total power of the cluster charging station, and the available power and the standby power of the cluster charging station.

[0078] Please refer to Figure 5 Optionally, the scheduling controller 200 is provided with a cloud server 201 and a background monitoring and management system 202, and the scheduling controller 200 can control the power transmission of the cluster charging station 1000 through the power scheduling algorithm.

[0079] Optionally, the scheduling controller can also receive the power scheduling request of the charging station and the control request of the SCADA system in real time, and after receiving the request, based on the power scheduling algorithm, the scheduling controller can issue corresponding scheduling instructions to each charging station to control the power transmission between each charging station (for example, based on the topological relationship between multiple charging stations, the on-off of each on-off switch) to ensure the balance between supply and demand between the charging stations and the public power grid.

[0080] Optionally, the dispatching controller can also receive the station building information of the newly added charging station, and determine whether the topological relationship of the plurality of charging stations has changed, and in the case that the topological relationship of the plurality of charging stations has changed, update the topological relationship of the plurality of charging stations in real time; in the case that the topological relationship of the plurality of charging stations has not changed, continue to receive the information of each charging station.

[0081] Optionally, the electric energy dispatching algorithm is an algorithm for determining the output electric energy of each charging station.

[0082] For example, taking the connection of the power supply input end of the charging station with the public power grid, the power generation equipment (taking the photovoltaic power generation equipment as an example) and the energy storage equipment as an example, the total electric energy of the cluster charging station is:

[0083]

[0084] Wherein, Q is the total electric energy of the cluster charging station, Y is the charging system electric energy (the electric energy provided by the public power grid) of the charging station, S is the photovoltaic power generation equipment electric energy, C is the energy storage system electric energy, i is the charging station number, and n is the total number of charging stations.

[0085] For the cluster charging station, based on the influence of the topological relationship of the plurality of charging stations, the demand power of the charging equipment (such as electric vehicles), the total power of the charging station and other factors, the electric energy dispatching algorithm of the cluster charging station can be:

[0086]

[0087] Wherein, is the dispatching result of a single charging station, is the electric energy dispatching result of a single charging device in the charging station, is the power demand parameter of a single charging station is the electric energy demand parameter of a single charging device in the charging station, i is the charging station number, j is the total number of charging devices, and X is the system performance parameter matrix. is the electric energy dispatching allocation function, which is determined according to the system topology and the electric energy dispatching priority and other parameters.

[0088] For the energy storage equipment and the photovoltaic power generation equipment, the charge and discharge power of the energy storage equipment is controlled by the dispatching controller, and the control algorithm is as follows:

[0089]

[0090] Wherein, is the dispatching control parameter of the energy storage equipment and the photovoltaic power generation equipment, is the dispatching control parameter of the energy storage equipment, is the dispatching control parameter of the photovoltaic power generation equipment, is the output electric energy of the cluster charging station, is the power output capability value of the public grid, X is the system performance parameter matrix, is the control parameter matrix of the SCADA system of the public grid to the dispatch controller; is the power dispatch function of the energy storage device and the photovoltaic power generation device, which is determined according to the performance parameters of the energy storage device, the performance parameters of the photovoltaic power generation device, the circuit topology relationship and the dispatch priority and the like.

[0091] In some embodiments, the power supply input ends of the plurality of charging stations are connected in a ring or a star.

[0092] The ring connection can be that the plurality of charging stations are connected together in a ring structure, each charging station is connected with two adjacent charging stations, and a closed loop is formed. For example, please refer to Figure 6 The charging station 101 is connected with the charging station 102, the charging station 102 is connected with the charging station 103, …, and the charging station 10n is connected with the charging station 101, so as to form a closed connection loop. If the electric energy needs to be transmitted between two non-directly connected charging stations, the electric energy can be transmitted to the adjacent charging station and then transmitted to the target charging station.

[0093] In addition, the cluster charging stations connected in a ring can be connected to one or more public grids (for example, 10kv). In the case of connecting to one public grid, the cluster charging stations can not consider the circulating current of the public grid, so as to reduce the complexity of the connection of the cluster charging stations. In the case of connecting to multiple public grids, the reliability of the power supply of the cluster charging stations can be increased. For example, in the case that any public grid has a fault, the cluster charging stations can be supplied with power through the public grid without the fault based on the interconnection of the charging stations.

[0094] The star connection can be that the plurality of charging stations are divided into different levels, and all the charging stations are connected with another charging station through an independent connection circuit, that is, any charging station is taken as a center node, the charging stations in the first level are connected with the charging station of the center node, the charging stations in the second level are connected with a charging station in the first level, and so on. The star connection can reduce the electric energy transmission path between two charging stations. For example, please refer to Figure 7 The charging station 5 is taken as the center node, the charging station 4 and the charging station 6 are directly connected with the charging station 5, the charging station 1, the charging station 2 and the charging station 3 are directly connected with the charging station 4, and the charging station 7 … the charging station n are directly connected with the charging station 6, and so on.

[0095] In addition, the charging stations connected in a star can also be connected to one or more public grids (for example, 10kv), and the voltage level of the public grid can even be greater than 10kv.

[0096] Optionally, the plurality of charging stations are divided into a plurality of groups, and the power input ends of the charging stations in each group are connected in a ring and / or star shape.

[0097] Specifically, the plurality of charging stations can be divided into a plurality of groups, and each group of charging stations includes at least one charging station, and the power input ends of the charging stations in each group are connected in a ring and / or star shape. That is, each charging station in the cluster of charging stations can be connected in a ring shape, or; according to the physical location of each charging station, part of the charging stations in the cluster of charging stations can be connected in a ring shape; or each charging station in the cluster of charging stations is connected in a star shape; or part of the charging stations in the cluster of charging stations are connected in a ring shape, and part of the charging stations are connected in a star shape, etc.

[0098] Optionally, the charging station further comprises a contactor matrix and a voltage boosting and bucking circuit, the power input end, the voltage boosting and bucking circuit, the contactor matrix and the power output end are connected in sequence, the voltage boosting and bucking circuit is used to adjust the voltage input to the contactor matrix from the power input end or the voltage input to the power input end from the contactor matrix, the contactor matrix comprises a plurality of contactors, and the contactor matrix is used to adjust the combination relationship of the plurality of contactors to adjust the output power of each power output end.

[0099] For example, please refer to Figure 1 , the charging station 101 further comprises a contactor matrix 111 and a voltage boosting and bucking circuit 121, the power input end 11, the voltage boosting and bucking circuit 121, the contactor matrix 111 and the power output end 21 are connected in sequence, the voltage boosting and bucking circuit is used to adjust the voltage input to the contactor matrix from the power input end or the voltage input to the power input end from the contactor matrix, the contactor matrix comprises a plurality of contactors, and the contactor matrix is used to adjust the combination relationship of the plurality of contactors to adjust the output power of each power output end.

[0100] Among them, the voltage boosting and bucking circuit can include multiple, which can be a direct current-direct current (DC / DC) power converter, the voltage boosting and bucking circuit has a bidirectional conversion function, that is, it can adjust the voltage input to the contactor matrix from the power input end; or it can also adjust the voltage input to the power input end from the contactor matrix.

[0101] Among them, the contactor matrix comprises a plurality of contactors, and by adjusting the connection mode of each contactor in the contactor matrix, the power distribution and power output of the power output end are changed.

[0102] Specifically, the power supply input end, the boost-buck circuit, the contactor matrix and the power supply output end are connected in sequence. The charging station obtains the power of the power grid through the power supply input end, and then adjusts (for example, increases or decreases, etc.) the voltage of the power input into the contactor matrix through the boost-buck circuit (for example, the power supply input end, the boost-buck circuit, the contactor matrix and the power supply output end are connected in sequence) to adapt to the needs of the contactor matrix or the power supply output end, and then adjusts the power distribution of each power supply output end (each charging pile) through the contactor matrix to meet the different charging needs of each charging pile on the charging station, thereby realizing large-power charging of the load.

[0103] Since the boost-buck circuit has a bidirectional conversion function, that is, it can adjust the voltage input from the power supply input end to the contactor matrix, or it can also adjust the voltage input from the contactor matrix to the power supply input end. Therefore, in the case that the charging station has redundant power, the charging station can also output the power to the power grid system in reverse. For example, in the case that the charging station is connected to the energy storage system, based on the boost-buck circuit, the power generated by the energy storage system can also be output to the power grid system in reverse, in other words, not only can the charging station charge the load (such as an electric vehicle) with large power, but also the load (such as an electric vehicle) can discharge the charging station.

[0104] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0105] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A cluster charging station, characterized in that, The application relates to a cluster charging station. The cluster charging station comprises a plurality of charging stations, wherein each charging station comprises a power input end, a power output end, a contactor matrix and a voltage conversion circuit, the power input end, the voltage conversion circuit, the contactor matrix and the power output end are sequentially connected, and the power input ends of the plurality of charging stations are connected.

2. The swarm charging station of claim 1, wherein, A connecting line is arranged between two charging stations connected by the power input end.

3. The swarm charging station of claim 2, wherein, The application further relates to a cluster charging station. A circuit breaker is arranged in the connecting line, and the circuit breaker is used for controlling the on-off of the connecting line.

4. The swarm charging station of claim 3, wherein, The cluster charging station further comprises a dispatching controller, the dispatching controller controls the on-off of each circuit breaker based on the topological relationship of the plurality of charging stations, so that the output power of a target charging station reaches a corresponding set power, and the target charging station comprises one or more charging stations with charging demands.

5. The cluster charging station according to any of claims 1-4, characterized in that, The power input end of the charging station is connected to a public power grid.

6. The swarm charging station of claim 5, wherein, The charging station comprises a transformer arranged between the public power grid and the power input end, and the transformer is used for adjusting the voltage input to the power input end.

7. The swarm charging station of claim 5, wherein, The charging station further comprises a rectifier used for converting between alternating current and direct current, and the power input end is connected to the alternating current side or the direct current side of the rectifier. The two ends of the rectifier are respectively connected to the transformer of the charging station and the power input end. Alternatively, the two ends of the rectifier are respectively connected to the power input end and the power output end.

8. The swarm charging station of claim 7, wherein, The rectifier comprises a bidirectional rectifier.

9. The swarm charging station of claim 5, wherein, The charging station comprises at least one of a power generation device and an energy storage device, and the power input end of the charging station is connected to at least one of the public power grid, the power generation device and the energy storage device.

10. The swarm charging station of claim 1, wherein, The power input ends of the plurality of charging stations are connected in a ring or in a star.

11. The swarm charging station of claim 1, wherein, The plurality of charging stations are divided into a plurality of groups, and the power input ends of the charging stations in each group are connected in a ring or in a star.

12. The swarm charging station of claim 1, wherein, The charging station further comprises a plurality of charging piles, and the power output end is arranged in the charging piles.

13. The swarm charging station of claim 1 or 12, wherein, The voltage conversion circuit is used for adjusting the voltage input to the contactor matrix by the power input end or the voltage input to the power input end by the contactor matrix, the contactor matrix comprises a plurality of contactors, and the contactor matrix is used for adjusting the combination relationship of the plurality of contactors to adjust the output power of each power output end.

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