Direct current charging station
By designing a DC charging station, real-time monitoring and control of charging power is achieved using transformer rectifiers and power control modules, the problem of lack of data communication and power control of AC slow charging piles is solved, and orderly charging and whole-station power monitoring are realized under the condition of insufficient distribution capacity.
Patent Information
- Application Number
- CN202421238495.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-05-31
AI Technical Summary
The existing 7kW AC slow charging pile lacks data communication functions and power control functions, and cannot achieve orderly charging.
A DC charging station is designed, including a distribution network, a transformer rectifier and a DC charging pile. The transformer rectifier includes a power control module. Through communication and connection with the DC charging pile, the charging power can be obtained and controlled in real time, so as to realize power monitoring of the entire station and power control of the charging piles one by one.
When the charging power is greater than the distribution capacity, orderly charging is achieved by actively reducing the charging power; the entire station power monitoring and power control of charging piles can be achieved without additional hardware costs, reducing construction costs.
Smart Images
Figure CN222973231U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of charging power supplies, and particularly to a DC charging station. Background Art
[0002] With the large-scale popularization of electric vehicles and the gradual improvement of charging facilities, more and more electric vehicles will charge at night in residential areas. When the access amount of the electric vehicle load exceeds the distribution output power, it may trigger protection and cause tripping and power-off. In order to complete charging within the given power capacity range, it is necessary to adjust the charging sequence and the power of simultaneous charging. Currently, the charging piles in residential areas are generally 7kW AC slow charging piles. On the one hand, these AC slow charging piles do not have data communication functions and cannot receive instructions. On the other hand, they do not have power control functions and cannot adjust the power. Therefore, the function of orderly charging cannot be realized on the existing AC slow charging piles. Summary of the Utility Model
[0003] The purpose of this application is to provide a DC charging station, which is used to solve the technical problems that the existing 7kW AC slow charging piles do not have data communication functions and cannot realize orderly charging.
[0004] To achieve the above purpose and other related purposes, in the first aspect, this application provides a DC charging station, which includes: a distribution network, a step-down rectifier, and a DC charging pile; the step-down rectifier is connected to the distribution network to convert the AC power supply of the distribution network into a DC power supply; the input end of the DC charging pile is connected to the output end of the step-down rectifier, and the output end of the DC charging pile is connected to the device to be charged; the step-down rectifier includes a power control module, and the power control module is connected to the in-pile controller of the DC charging pile to control the allowable output power of the DC charging pile.
[0005] In one implementation manner of the first aspect, the step-down rectifier is also communicatively connected to the DC charging pile, and the step-down rectifier receives the charging power of the devices to be charged connected to each DC charging station.
[0006] In one implementation manner of the first aspect, the power control module real-time obtains the output power of the step-down rectifier.
[0007] In one implementation manner of the first aspect, the power control module receives the charging power, and controls the allowable output power of each DC charging pile according to the charging power and the output power of the step-down rectifier.
[0008] In one implementation manner of the first aspect, the communication method between the step-down rectifier and each DC charging pile is one-to-many timed query from the step-down rectifier to each DC charging pile.
[0009] In one implementation of the first aspect, the communication protocols between the variable voltage rectifier and each of the DC charging piles are: RS485 communication, CAN communication, and / or wireless communication.
[0010] In one implementation of the first aspect, if a communication failure occurs between the variable voltage rectifier and the DC charging pile, the DC charging pile adjusts the allowable output power of the DC charging pile according to a preset power limit condition, so that the total output power of each DC charging pile meets the power supply capacity of the variable voltage rectifier.
[0011] In one implementation of the first aspect, the input end of the DC charging pile is connected to the output end of the variable voltage rectifier through a two-core bus.
[0012] In one implementation of the first aspect, the variable voltage rectifier is connected to at least one of the DC charging piles.
[0013] In one implementation of the first aspect, the DC charging pile is a low-power DC charging pile with a charging power not exceeding 7KW.
[0014] As described above, the DC charging station of the present application has the following beneficial effects:
[0015] The DC charging station of the present application can achieve orderly charging by actively reducing the charging power when the charging demand power is greater than the distribution capacity, so as to still achieve charging under the condition of insufficient distribution capacity; and the variable voltage rectifier in the present application can sense the power demand of the whole station and has its own communication interface, and can realize the power monitoring of the whole station and the power control of each charging pile without additional hardware costs. Brief Description of the Drawings
[0016] Figure 1 It shows a schematic structural diagram of the DC charging station described in an embodiment of the present application.
[0017] Figure 2 It shows a schematic structural diagram of the DC charging station described in another embodiment of the present application.
[0018] Figure 3 It shows a schematic circuit diagram of the working flow chart of the DC charging station described in an embodiment of the present application.
[0019] Figure 4 It shows a schematic structural diagram of the present application in an actual embodiment.
[0020] Label Description
[0021] 100 DC charging station
[0022] 110 Distribution network
[0023] 120 Variable voltage rectifier
[0024] 121 Power control module
[0025] 130 DC charging pile
[0026] 131 Controller inside the pile
[0027] 20 Device to be charged Specific implementation manners
[0028] The following uses specific examples to illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.
[0029] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner. Therefore, only the components related to the present application are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.
[0030] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "middle", "upper", "lower", "top", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.
[0031] In addition, it should also be understood that unless otherwise specifically stated or pointed out, the terms "first", "second", etc. appearing in the specification are only used to distinguish each component, element, step, etc. in the specification, rather than indicating the logical relationship or sequential relationship between each component, element, step, etc. It should not be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.
[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of this application that is claimed, but merely represents selected embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.
[0033] Regarding the problems that the current 7kW AC slow charging piles do not have data communication functions and cannot achieve orderly charging, this application adopts a small-power DC charging solution. Specifically, a charging power of 7kW is still used, but the battery is directly charged through the DC charging port. Compared with AC charging, DC charging can not only complete switch control but also control the magnitude of the charging current. In the normal charging mode, the magnitude of the output current of the step-down rectifier is determined by the electric vehicle load connected to the DC charging pile. Whatever current the electric vehicle load requires, the step-down rectifier provides that current. Under peak power consumption of the step-down rectifier, when the number of DC charging piles connected to and operating on the step-down rectifier increases, the output current of the step-down rectifier is jointly controlled by the electric vehicle load and the total power of the DC charging piles connected to and operating on the step-down rectifier. If the total power of the DC charging piles exceeds the power supply capacity of the step-down rectifier, the allowed output power of each DC charging pile is controlled to decrease, thereby reducing the input current of each electric vehicle load so that the total power of the DC charging piles meets the power supply capacity of the step-down rectifier, thus achieving orderly charging.
[0034] Based on this, this application provides a DC charging station, including: a distribution network, a step-down rectifier, and DC charging piles; wherein, the step-down rectifier is connected to the distribution network, the input end of the DC charging pile is connected to the output end of the step-down rectifier, and the output end of the DC charging station is connected to the device to be charged; the step-down rectifier includes a power control module to control the allowed output power of the DC charging piles, thereby achieving whole-station power monitoring and power control for each charging pile without additional hardware costs, and further enabling charging under the condition of insufficient power distribution capacity. The DC charging station of this application has a simple structure, high reliability, and does not require additional devices, which can greatly reduce the construction cost of the DC charging station.
[0035] The following will be combined with the attached Figure 1 to the attached Figure 4Elaborate on the principle and implementation of the DC charging station in this embodiment, so that those skilled in the art can understand the DC charging station in this embodiment without creative work.
[0036] Please refer to Figure 1 , which shows a schematic structural diagram of the high-voltage switch assembly in an embodiment of this application. As Figure 1 shown, the DC charging station 100 includes: a distribution network 110, a step-down rectifier 120, and a DC charging pile 130.
[0037] Specifically, the step-down rectifier 120 is connected to the distribution network 110 to convert the AC power supply of the distribution network 110 into a DC power supply; the input end of the DC charging pile 130 is connected to the output end of the step-down rectifier 120, and the output end of the DC charging pile 130 is connected to the device to be charged 20; the step-down rectifier 120 includes a power control module 121, and the power control module 121 is connected to the in-pile controller 131 of the DC charging pile 130 to control the allowable output power of the DC charging pile 130. In some implementation manners, the step-down rectifier 120 is also communicatively connected to the DC charging pile 130, and the step-down rectifier 120 receives the charging power of the device to be charged 20 connected to each DC charging station 100.
[0038] As Figure 2 shown, the power control module 121 of the step-down rectifier 120 is communicatively connected to the in-pile controller 131 of the DC charging pile 130.
[0039] Specifically, the power control module 121 real-time obtains the output power of the step-down rectifier 120.
[0040] Specifically, the power control module 121 receives the charging power of the DC charging pile 130, and controls the allowable output power of each DC charging pile 130 according to the charging power and the output power of the step-down rectifier 120.
[0041] In some implementation manners, the communication method between the step-down rectifier 120 and each DC charging pile 130 is one-to-many timed query from the step-down rectifier 120 to each DC charging pile 130.
[0042] Specifically, the step-down rectifier 120 sequentially issues query commands to the DC charging piles 130 connected to the step-down rectifier 120 according to a preset timing setting.
[0043] It should be noted that the preset timing setting is not a unique value and can be adjusted accordingly according to the actual working scenario.
[0044] Optionally, the communication protocols between the variable voltage rectifier 120 and each of the DC charging piles 130 are: RS485 communication, CAN communication, and / or wireless communication.
[0045] The following describes the specific implementation manner in which the power control module 121 controls the allowable output power of each of the DC charging piles 130 according to the charging power and the output power of the variable voltage rectifier 120.
[0046] As Figure 3 shown, the variable voltage rectifier 120 measures its own output power in real time, and sequentially sends query commands to the DC charging piles 130 connected to the variable voltage rectifier 120 according to a preset timing setting. Each of the DC charging piles 130 receives the query command and returns the current output power to the variable voltage rectifier 120, that is, the charging power of the device 20 to be charged connected to the DC charging pile 130. The variable voltage rectifier 120 receives the output power of each of the DC charging piles 130.
[0047] If the output power of the variable voltage rectifier 120 is greater than the power supply capacity of the variable voltage rectifier 120, the allowable output power of each of the DC charging piles 130 is adjusted according to a preset ratio, so as to adjust the charging power of the device 20 to be charged connected to the DC charging pile 130, so that the output power of the transformer is reduced to the power supply capacity range of the variable voltage rectifier 120. If the output power of the transformer is much less than the power supply capacity of the variable voltage rectifier 120, the allowable output power of the DC charging pile 130 is gradually increased; if the output power of the variable voltage rectifier 120 is not greater than the power supply capacity of the variable voltage rectifier 120, the allowable output power of each of the DC charging piles 130 is not changed, and the current working state is maintained. If a communication failure occurs between the variable voltage rectifier 120 and the DC charging pile 130, the DC charging pile 130 adjusts the allowable output power of the DC charging pile 130 according to a preset power limit condition, so that the total output power of each of the DC charging piles 130 meets the power supply capacity of the variable voltage rectifier 120.
[0048] In some implementation manners, as Figures 1 to 2 shown, the input end of the DC charging pile 130 is connected to the output end of the variable voltage rectifier 120 through a two-core bus; the variable voltage rectifier 120 is connected to at least one of the DC charging piles 130.
[0049] It should be noted that each of the DC charging piles 130 in the DC charging station 100 described in the embodiments of the present application is a low-power DC charging pile 130 with a charging power not exceeding 7 kW.
[0050] In a practical embodiment, the present application provides a DC charging station 100 with a power supply capacity of 250 kVA, which includes 40 small-power DC charging piles 130 with a power of 7 kW. The total output power of the 40 DC charging piles 130 is 280 kW, which is greater than the power supply capacity of the DC charging station 100.
[0051] As Figure 4 shown, in this embodiment, the power supply capacity of the DC charging station 100 is 250 kVA, and the actually allowed power is 80% of the power supply capacity, that is, 200 kW. The total output power of the 40 DC charging piles 130 may be 280 kW.
[0052] In this embodiment, when the DC charging station 100 starts to operate, after the transformer rectifier 120 establishes communication with each DC charging pile 130, the transformer rectifier 120 periodically obtains the output power from each DC charging pile 130 in turn, and sets the power limit value of each DC charging pile 130 to 100% at the start of operation, that is, allows the DC charging pile 130 to operate at full power, and calculates the total load by measuring the real-time output power of each DC charging pile 130.
[0053] When the total load of the transformer rectifier 120 does not exceed 200 kW, the limit value of 100% of each DC charging pile 130 is maintained unchanged.
[0054] When the total load of the transformer rectifier 120 exceeds 200 kW, according to the exceeded amplitude, the required limit value of each DC charging pile 130 is given.
[0055] For example, when the total output power of each DC charging pile 130 measured is P and P > 200 kW, then the power of each DC charging pile 130 is limited to 200 / P * 100%, so that the total output power of each DC charging pile 130 can be limited to 200 kW. When P <= 200 kW, the power limit value of each DC charging pile 130 is restored to 100%. Once the power of a certain DC charging pile 130 does not receive an instruction from the transformer rectifier 120 within a given time interval, it is considered that a communication failure has occurred between the DC charging pile 130 and the transformer rectifier 120, and the power of the DC charging pile 130 is automatically limited to 200 / 280 * 100% = 71%. In this way, in case of a communication failure, it can also be ensured that the DC charging station 100 will not be overloaded due to the DC charging pile 130.
[0056] The descriptions of the processes or structures corresponding to the above respective drawings have their own emphases. For parts not detailed in a certain process or structure, reference can be made to the relevant descriptions of other processes or structures.
[0057] In summary, when the charging demand power of the DC charging station of the present application is greater than the distribution capacity, orderly charging can be achieved by actively reducing the charging power, so that charging can still be realized under the condition of insufficient distribution capacity; and the transformer rectifier in the present application can sense the power demand of the whole station and has its own communication interface, and can realize the power monitoring of the whole station and the power control of each charging pile without additional hardware costs. The DC charging station of the present application has a simple structure, high reliability, does not require additional devices, and can greatly reduce the construction cost of the DC charging station. Therefore, the present application effectively overcomes various shortcomings in the prior art and has high industrial utilization value.
[0058] The above embodiments are only illustrative of the principles and effects of the present application, and are not intended to limit the present application. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed in the present application shall still be covered by the claims of the present application.
Claims
1. A DC charging station, characterized in that: The DC charging station includes: a distribution network, a transformer rectifier and a DC charging pile; The transformer rectifier is connected to the power distribution network to convert the AC power of the power distribution network into a DC power supply; The input end of the DC charging pile is connected to the output end of the transformer rectifier, and the output end of the DC charging station is connected to the device to be charged; The transformer rectifier includes a power control module, and the power control module is connected to the internal controller of the DC charging pile to control the allowed output power of the DC charging pile; The DC charging pile is a low-power DC charging pile with a charging power not exceeding 7KW.
2. The DC charging station according to claim 1, characterized in that: The transformer-rectifier is also communicatively connected to the DC charging piles, and the transformer-rectifier receives charging power from the devices to be charged connected to each of the DC charging stations.
3. The DC charging station according to claim 2, characterized in that: The power control module obtains the output power of the transformer rectifier in real time.
4. The DC charging station according to claim 3, characterized in that: The power control module receives the charging power, and controls the allowed output power of each of the DC charging piles according to the charging power and the output power of the transformer rectifier.
5. The DC charging station according to claim 2, characterized in that: The communication mode between the transformer rectifier and each of the DC charging piles is a one-to-many timing query from the transformer rectifier to each of the DC charging piles.
6. The DC charging station according to claim 2, characterized in that: The communication protocol between the transformer rectifier and each of the DC charging piles is: RS485 communication, CAN communication and / or wireless communication.
7. The DC charging station according to claim 2, characterized in that: If the transformer-rectifier fails to communicate with the DC charging pile, the DC charging pile adjusts the allowable output power of the DC charging pile according to a preset power limit condition so that the total output power of each DC charging pile meets the power supply capacity of the transformer-rectifier.
8. The DC charging station according to claim 1, characterized in that: The input end of the DC charging pile is connected to the output end of the transformer rectifier through a two-core bus.
9. The DC charging station according to claim 1, characterized in that: The transformer rectifier is connected to at least one of the DC charging piles.