Electric vehicle charging control method and system based on intelligent fusion terminal of transformer area

Abstract

This invention discloses an electric vehicle charging control method and system based on a smart integrated terminal for distribution transformer areas, relating to the field of electric vehicle charging technology. The method includes: S100, obtaining the remaining capacity of the distribution transformer; S200, if the remaining capacity is greater than a first limit for the remaining capacity of the distribution transformer, then the charging pile charges at a first charging power; S300, if the remaining capacity of the distribution transformer is greater than or equal to a second limit for the remaining capacity of the distribution transformer, then the charging power of the charging pile with a charging duration greater than a set charging duration is adjusted to a second charging power to charge the electric vehicle; S400, if the charging vehicle access status of N charging piles is detected to have changed to "accessed," then their charging power is adjusted to the second charging power, and the charging power of the N charging piles that have changed to "accessed" is adjusted to the first charging power. This invention solves the problems of distribution transformer overload and power grid supply-demand imbalance caused by disorderly charging under the current surge in the number of electric vehicles, ensuring the safe and stable operation of the power grid.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle charging technology, and in particular to an electric vehicle charging control method and system based on a smart fusion terminal for power distribution areas. Background Technology

[0002] With the increasing prevalence of electric vehicles in the future, large-scale electric vehicle charging will have a significant impact on the planning and operation of the power system. One of the most important impacts is that large-scale electric vehicle charging will bring about a new round of load growth. In particular, the charging of electric vehicles during peak electricity consumption periods will further exacerbate the peak-valley difference in grid load, which may lead to a series of problems such as distribution line overload, voltage drop, increased distribution network losses, and distribution transformer overload. Currently, most users charge their electric vehicles immediately after returning home, with charging time concentrated between 6 pm and 11 pm, and the peak charging time around 8 pm to 10 pm. This overlaps with the current residential electricity load by as much as 85%. The peak charging period coincides with the peak electricity load period in residential areas, resulting in a significant load pressure on the distribution network. Summary of the Invention

[0003] This invention provides an electric vehicle charging control method based on a smart integrated terminal for distribution substations, in order to solve the problem that the peak charging period for electric vehicles coincides with the peak electricity consumption period for residents, resulting in a large load pressure on the distribution network.

[0004] In a first aspect, the present invention provides an electric vehicle charging control method based on a smart converged terminal for distribution substations, comprising:

[0005] S100, obtain the remaining capacity of the distribution transformer in the preset area, wherein the remaining capacity is the difference between the rated power and the real-time load power of the transformer in the preset area;

[0006] S200: If the remaining capacity of the distribution transformer is greater than or equal to the preset first remaining capacity limit of the distribution transformer, a full-load charging control command is sent to each charging pile to control the charging pile to charge the connected electric vehicle with the first charging power; otherwise, proceed to S300.

[0007] S300, if the remaining capacity of the distribution transformer is greater than or equal to the preset second remaining capacity limit of the distribution transformer, then the charging time of each of the charging piles is obtained, the charging power of the charging piles whose charging time is greater than the set charging time is adjusted to the second charging power to charge the connected electric vehicle, and then proceed to S400; the first charging power is greater than the second charging power.

[0008] S400, real-time acquisition of the charging vehicle access status of each charging pile; if it is detected that the charging vehicle access status of N charging piles has changed from not being accessed to being accessed, then the charging duration and / or charging amount of each charging pile with the charging power of the first charging power is acquired, and the charging piles with the charging power of the first charging power are sorted according to the charging duration and / or charging amount to obtain a first sequence table, and the charging power of the first N charging piles in the first sequence table is adjusted from the first charging power to the second charging power, and the charging power of the N charging piles whose charging vehicle access status has changed from not being accessed to being accessed is adjusted to the first charging power, N≥1.

[0009] The beneficial effects of this invention are:

[0010] The electric vehicle charging control method based on the intelligent integrated terminal of the distribution area of ​​the present invention controls the electric vehicle charging load to decrease when the residential load increases, thereby avoiding overload operation of the distribution transformer caused by concentrated charging, improving the safety and reliability of distribution transformer operation, and preventing power outages caused by distribution transformer overload; at the same time, through the orderly charging of charging piles, the utilization rate and operating economy of distribution transformers are improved, effectively reducing the load pressure of the distribution network. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a flowchart of an electric vehicle charging control method based on a smart fusion terminal in a distribution area, provided by the present invention.

[0013] Figure 2 This is a schematic diagram of an electric vehicle charging framework based on a smart converged terminal in a distribution area, provided by the present invention.

[0014] Figure 3 This is a schematic diagram of the load curve generated by the control method of this invention but not using the control method of this invention;

[0015] Figure 4 This is a schematic diagram of the load curve generated by the control method of this invention. Detailed Implementation

[0016] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of the invention with unnecessary detail.

[0017] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0018] It should also be understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0019] As used in this specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0020] Furthermore, in the description of this invention and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of the invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0022] It should be understood that the sequence number of each step in the following embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0023] To illustrate the technical solution of the present invention, specific embodiments are described below.

[0024] Please see Figure 1-4 The present invention provides such as Figure 1 The electric vehicle charging control method based on the intelligent converged terminal of the distribution area shown may include the following steps:

[0025] Step S100: Obtain the remaining capacity of the transformer within the preset area, wherein the remaining capacity is the difference between the rated power and the load power of the transformer within the preset area.

[0026] See Figure 2 This is an electric vehicle charging framework based on intelligent converged terminals, including a series of equipment such as intelligent converged terminals in the distribution area, orderly charging communication units, AC charging piles, intelligent circuit breakers, and meter boxes; the transformers in this preset area simultaneously bear the conventional load of residents and the charging load of electric vehicles.

[0027] The intelligent fusion terminal communicates with the distribution cabinet of the transformer in the preset area via wired or wireless means to obtain the remaining capacity of the transformer in the preset area. The remaining capacity is the idle power of the transformer in the preset area, that is, the difference between the rated power and the load power of the transformer in the preset area.

[0028] The communication between the smart converged terminal and the charging pile is carried out wirelessly or via carrier. If carrier communication is used, it needs to be staggered with the frequency of the meter reading business of the marketing department to avoid mutual interference. The wireless or carrier module is converted to RS485 to communicate with the charging pile.

[0029] The intelligent converged terminal communicates with the devices in the meter box via wireless or carrier wave. The wireless or carrier wave module converts the data into RS485 to communicate with the intelligent switches and electrical safety monitoring terminals in the meter box.

[0030] The charging pile can communicate with the vehicle network via 4G, or it can be offline. The charging pile can communicate with the intelligent fusion terminal of the distribution area via low-power short-range wireless, broadband carrier, Ethernet, etc. The intelligent fusion terminal of the distribution area and the orderly charging communication unit are respectively equipped with short-range wireless communication module and broadband carrier module. This method does not consider whether the AC charging pile is connected to the vehicle network or other charging pile management platform, and has no impact on the orderly charging control based on edge computing of the intelligent fusion terminal of the distribution area.

[0031] The equipment involved in this embodiment is a smart fusion terminal for the substation and an AC charging pile containing a sequential charging communication unit. The charging pile can communicate with the vehicle network according to existing standards, or it can choose not to communicate with the vehicle network, which has no impact on the sequential charging control.

[0032] Step S200: If the remaining capacity of the distribution transformer is greater than or equal to the preset first remaining capacity limit of the distribution transformer, a full-load charging control command is sent to each charging pile to control the charging pile to charge the connected electric vehicle at the first charging power; otherwise, proceed to S300.

[0033] When a charging station is charging, it first interacts with the intelligent fusion terminal. Only when the intelligent fusion terminal sends a charging command can charging be controlled.

[0034] In step S100 above, if the obtained remaining capacity of the distribution transformer is greater than or equal to the set first remaining capacity limit of the distribution transformer, it means that the current remaining capacity of the distribution transformer is relatively sufficient, the residential regular load is small, and it can provide a large electric vehicle charging load; at this time, a full-load charging control command is sent to each charging pile to control each charging pile to charge the connected electric vehicle at the first charging power.

[0035] For example, if the initial remaining capacity of the first distribution transformer is set to 100kVA, and the obtained remaining capacity is 150kVA, then the intelligent fusion terminal sends a full-load charging control command to each charging pile. Optionally, the initial charging power of the charging pile is 7kW.

[0036] Step S300: If the remaining capacity of the distribution transformer is greater than or equal to the preset second remaining capacity limit of the distribution transformer, then obtain the charging time of each of the charging piles, adjust the charging power of the charging piles whose charging time is greater than the set charging time to the second charging power to charge the connected electric vehicles, and proceed to S400; the first charging power is greater than the second charging power.

[0037] If the obtained remaining capacity of the distribution transformer is less than the set first limit for remaining capacity, it indicates that the current remaining capacity of the distribution transformer is small and the residential routine load is large, requiring the implementation of orderly charging control to neutralize the large residential routine load. Optionally, the second charging power is 1.3kW.

[0038] In this embodiment, the intelligent fusion terminal obtains the charging time of each charging pile, compares the charging time of each charging pile with the set charging time, and adjusts the charging power of the charging pile with a charging time longer than the set charging time from the first charging power to the second charging power, wherein the first charging power is greater than the second charging power, thereby reducing the charging load of the electric vehicle.

[0039] For example, if the charging time is set to 4 hours, the charging power of a charging station that has been charging for more than 4 hours will be adjusted from 7kW to 1.3kW to ensure that the charging operation is not settled and to reduce the power of charging.

[0040] Step S400: Real-time acquisition of the charging vehicle access status of each charging pile. If it is detected that the charging vehicle access status of N charging piles has changed from not being accessed to being accessed, then the charging duration and / or charging amount of each charging pile with the charging power of the first charging power is acquired. The charging piles with the charging power of the first charging power are sorted according to the charging duration and / or charging amount to obtain a first sequence table. The charging power of the first N charging piles in the first sequence table is adjusted from the first charging power to the second charging power. The charging power of the N charging piles whose charging vehicle access status has changed from not being accessed to being accessed is adjusted to the first charging power, where N≥1.

[0041] In this embodiment, the charging time and / or charging amount of each charging pile with the first charging power are obtained, and the charging piles are sorted according to the charging time and / or charging amount to obtain a first sequence table. As a first embodiment, the first sequence table is obtained based on the charging time of each charging pile with the first charging power, and the charging pile with the longer charging time is ranked higher in the first sequence table. As a second embodiment, the first sequence table is obtained based on the charging amount of each charging pile with the first charging power, and the charging pile with the larger charging amount is ranked higher in the first sequence table. As a third embodiment, the first sequence table is obtained based on the charging time and charging amount of each charging pile with the first charging power, and the charging pile with both the longer charging time and the larger charging amount is ranked higher in the first sequence table.

[0042] Step S300 further includes: if the remaining capacity of the distribution transformer is less than the second remaining capacity limit of the distribution transformer, the remaining capacity of the distribution transformer is greater than or equal to the preset third remaining capacity limit of the distribution transformer, and the charging vehicle access status of N charging piles is detected to change from never being accessed to being accessed, then the charging duration and / or charging amount of each charging pile with the charging power of the first charging power are obtained, and the charging piles with the charging power of the first charging power are sorted according to the charging duration and / or charging amount to obtain a second sequence table, and the charging power of the first N charging piles in the second sequence table is adjusted from the first charging power to the second charging power, and the charging power of the N charging piles with the charging vehicle access status changed from never being accessed to being accessed is adjusted to the second charging power, and the second remaining capacity limit of the distribution transformer is greater than the third remaining capacity limit of the distribution transformer.

[0043] The method for obtaining the second sequential table in this invention is the same as the method for obtaining the first sequential table, and will not be described again here.

[0044] For example, the remaining capacity limit of the second distribution transformer is set to 50kVA. The remaining capacity of the distribution transformer is monitored in real time. If the remaining capacity of the distribution transformer is 40kVA, the charging power of the newly connected charging pile is adjusted to 1.3kW. At the same time, the charging power of the charging pile ranked first in the second sequence table is adjusted to 1.3kW. The intelligent fusion terminal reports the charging load alarm information of the distribution area to the main station. An alarm is triggered for each charging pile connected.

[0045] Step S300 further includes: if the remaining capacity of the distribution transformer is less than a preset third remaining capacity limit and greater than a preset minimum power limit, then according to the charging time of the charging piles, the charging power of the charging piles with the first charging power is adjusted to the second charging power in descending order, until the remaining capacity of the distribution transformer is greater than or equal to the third remaining capacity limit; the remaining capacity of the third distribution transformer is greater than the minimum power limit.

[0046] For example, the remaining capacity limit of the third distribution transformer is set to 20kVA. The remaining capacity of the distribution transformer is monitored in real time. If the remaining capacity of the distribution transformer is 15kVA, it means that the load of residents in the distribution area continues to rise. Then, according to the charging time of the charging piles, the charging power of the charging piles with a charging power of 7KW is adjusted to 1.3kW in descending order, until the remaining capacity of the distribution transformer is greater than or equal to 20kVA. The intelligent integrated terminal of the distribution area reports the charging load alarm information of the distribution area to the main station. An alarm is triggered for each charging pile connected.

[0047] If, after adjusting the charging power of all charging piles with the first charging power to the second charging power in descending order of charging time, the remaining capacity of the transformer is still less than the remaining capacity of the third transformer, then the charging piles will be shut down in descending order of charging time until the remaining capacity of the transformer is greater than or equal to the remaining capacity of the third transformer.

[0048] In this embodiment, if the remaining capacity of the distribution transformer is still less than the limit of the remaining capacity of the third distribution transformer after all the charging piles are adjusted to 1.3kW, it means that the residential load is large and the total power of the transformer will not be able to meet the charging of electric vehicles and the residential electricity consumption at the same time. At this time, it is necessary to cut off the power supply of the charging piles and turn off the charging piles in order of charging time from large to small until the remaining capacity of the distribution transformer is greater than or equal to the remaining capacity of the third distribution transformer.

[0049] This invention adjusts the charging power of all charging piles with the first charging power to the second charging power in descending order of charging time. It also acquires the residential load power in real time and obtains the trend of residential load power change based on the residential load power. If the residential load power change trend is downward and the remaining capacity of the distribution transformer is greater than the remaining capacity of the third distribution transformer, the adjustment time of each charging pile adjusted from the first charging power to the second charging power is acquired. Based on the adjustment time, the charging power of the charging piles is adjusted from the second charging power to the first charging power in descending order, but it should be ensured that the remaining capacity of the distribution transformer after each adjustment is still greater than the remaining capacity of the third distribution transformer.

[0050] In this embodiment, when the residential load decreases, the remaining capacity of the distribution transformer will increase accordingly. When the remaining capacity of the distribution transformer is greater than the remaining capacity of the third distribution transformer, the charging power of the charging pile that was adjusted to 1.3kW can be readjusted to 7kW. The order of adjustment is based on the order of adjustment time of each charging pile that was adjusted from the first charging power to the second charging power, that is: the charging pile that was adjusted from 7kW to 1.3kW will be readjusted to 7kW first.

[0051] In this embodiment, if the remaining capacity of the distribution transformer is less than the preset minimum capacity limit and the charging control of each of the charging piles fails, a fault isolation message and a warning message are sent to the main station, and a disconnection command is sent to the smart circuit breaker corresponding to the charging pile within a preset time to control the charging pile to disconnect the power supply.

[0052] In this embodiment, a minimum power limit is also set to protect the transformers in the distribution area, ensuring that the transformer load is within the rated load.

[0053] In this embodiment, the rated charging power and real-time charging power of each charging pile are obtained. If the real-time charging power is greater than the rated charging power, a disconnection command is sent to the charging pile with the real-time charging power greater than the rated charging power to control the charging pile with abnormal charging power to disconnect the power supply.

[0054] The intelligent integrated terminal also monitors the charging power of the charging pile in real time. When the charging power of the charging pile exceeds the rated charging power, it indicates that the charging pile has malfunctioned and the power needs to be cut off in time to prevent a larger accident.

[0055] See Figure 3 The figure shows the load curve generated without using the charging control method described in this embodiment. See [link / reference]. Figure 4 The load curve generated after applying the charging control method of this embodiment is... Figure 3 and Figure 4As can be seen from the comparison, after adopting the charging control method of this embodiment, the maximum value of the total load of the transformer in the distribution area can be reduced from about 8MW to about 5.5MW, which effectively improves the safety and reliability of the transformer operation and prevents power outages caused by transformer overload.

[0056] The electric vehicle charging control method based on the intelligent converged terminal of the distribution area in this embodiment has the following characteristics:

[0057] (1) It can avoid overload operation of distribution transformers caused by concentrated charging, improve the safety and reliability of distribution transformer operation, and prevent power outages caused by overload of distribution transformers.

[0058] (2) By charging the charging piles in an orderly manner, the load curve of the distribution transformer can be smoothed, and the utilization rate and operating economy of the distribution transformer can be improved.

[0059] (3) Through real-time data collection, the operating status of the charging pile can be monitored in real time, and charging faults can be quickly isolated.

[0060] The present invention also provides an electric vehicle charging system based on a smart integrated terminal for substations. The electric vehicle charging system based on a smart integrated terminal for substations includes a smart integrated terminal for substations, wherein the smart integrated terminal for substations includes a processor, a memory, and a terminal program stored in the memory and executable on the processor. When the processor executes the terminal program, it implements the electric vehicle charging control method based on the smart integrated terminal for substations in the above embodiments.

[0061] To ensure safe electricity use for charging piles, the system is also equipped with an electrical safety monitoring terminal, which measures, meters, monitors fires, and monitors electrical safety in the AC charging pile power distribution system. The electrical safety monitoring terminal monitors multiple power grid parameters such as phase current, neutral current, voltage, power, power factor, unbalance rate, and total harmonic distortion rate. It has the function of analyzing the 2nd to 50th harmonics of phase voltage and current, enabling the prediction and early warning of electrical fires and realizing fire-fighting linkage.

[0062] The electric vehicle charging system based on the intelligent integrated terminal of the distribution area in this embodiment realizes real-time collection of information such as the operating status data, power data, and alarm events of electric vehicle charging piles. At the same time, combined with the three main factors of distribution transformer load forecast, electric vehicle charging demand in the distribution area, and distribution transformer power limitation, the system formulates electric vehicle charging management and control strategies within the distribution area. This enables control and management of the start and stop of electric vehicle charging piles, output power level, and emergency disconnection of power access points within the distribution area, thereby improving the utilization rate of distribution transformer equipment and reducing the operational risks of distribution transformers caused by centralized charging.

[0063] In one application scenario, the charging piles are wall-mounted and suspended, supporting both card swiping and QR code password entry for use. Considering information security and signal issues in underground parking lots, the charging piles and vehicle owner information are not integrated into the system. For authorized use, card swiping or password authentication is used. When using QR code, the charging pile communicates with the mobile phone via Bluetooth, and after password verification, it can be used normally. Billing for the charging piles is handled by an external, independent electricity meter, with each charging pile equipped with a separate metering device. Once charging begins, the charging pile is managed by the integrated terminal for orderly charging.

[0064] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for controlling electric vehicle charging based on a smart fusion terminal for distribution substations, characterized in that, include: S100, obtain the remaining capacity of the distribution transformer in the preset area, wherein the remaining capacity is the difference between the rated power and the real-time load power of the transformer in the preset area; S200: If the remaining capacity of the distribution transformer is greater than or equal to the preset first remaining capacity limit of the distribution transformer, a full-load charging control command is sent to each charging pile to control the charging pile to charge the connected electric vehicle with the first charging power; otherwise, proceed to S300. S300, if the remaining capacity of the distribution transformer is greater than or equal to the preset second remaining capacity limit of the distribution transformer, then the charging time of each of the charging piles is obtained, the charging power of the charging piles whose charging time is greater than the set charging time is adjusted to the second charging power to charge the connected electric vehicle, and then proceeds to S400; the first charging power is greater than the second charging power, and the first remaining capacity limit of the distribution transformer is greater than the second remaining capacity limit of the distribution transformer. S400: Real-time acquisition of the charging vehicle access status of each charging pile; if it is detected that the charging vehicle access status of N charging piles has changed from not being accessed to being accessed, then the charging duration and / or charging amount of each charging pile with the charging power of the first charging power is acquired; the charging piles with the charging power of the first charging power are sorted according to the charging duration and / or charging amount to obtain a first sequence table; the charging power of the first N charging piles in the first sequence table is adjusted from the first charging power to the second charging power; the charging power of the N charging piles whose charging vehicle access status has changed from not being accessed to being accessed is adjusted to the first charging power, N≥1; S300 further includes: If the remaining capacity of the distribution transformer is less than the second remaining capacity limit of the distribution transformer, the remaining capacity of the distribution transformer is greater than or equal to the preset third remaining capacity limit of the distribution transformer, and the charging vehicle access status of N charging piles is detected to change from never being accessed to being accessed, then the charging duration and / or charging amount of each charging pile with the charging power of the first charging power are obtained. The charging piles with the charging power of the first charging power are sorted according to the charging duration and / or charging amount to obtain a second sequence table. The charging power of the first N charging piles in the second sequence table is adjusted from the first charging power to the second charging power. The charging power of the N charging piles with the charging vehicle access status changed from never being accessed to being accessed is adjusted to the second charging power. The second remaining capacity limit of the distribution transformer is greater than the third remaining capacity limit of the distribution transformer.

2. The electric vehicle charging control method based on a smart converged terminal in a distribution area according to claim 1, characterized in that, In S300, if the remaining capacity of the distribution transformer is less than the second remaining capacity limit of the distribution transformer and the remaining capacity of the distribution transformer is greater than or equal to the preset third remaining capacity limit of the distribution transformer, the intelligent fusion terminal of the distribution area reports the charging load alarm information in the preset area to the main station, and reports an alarm to the main station once when the access status of each charging pile changes from not connected to connected.

3. The electric vehicle charging control method based on a smart fusion terminal for distribution areas according to claim 1, characterized in that, The S300 also includes: If the remaining capacity of the transformer is less than the preset third transformer remaining capacity limit and greater than the preset minimum power limit, then the charging power of the charging pile with the first charging power is adjusted to the second charging power in descending order of the charging time of the charging pile, until the remaining capacity of the transformer is greater than or equal to the third transformer remaining capacity limit; and the remaining capacity of the third transformer is greater than the minimum power limit.

4. The electric vehicle charging control method based on a smart fusion terminal for distribution areas according to claim 3, characterized in that, In S300, if the charging power of all charging piles with the first charging power is adjusted to the second charging power in descending order of charging time, and the remaining capacity of the distribution transformer is still less than the remaining capacity of the third distribution transformer, then the charging piles are turned off in descending order of charging time until the remaining capacity of the distribution transformer is greater than or equal to the remaining capacity of the third distribution transformer.

5. The electric vehicle charging control method based on a smart fusion terminal for distribution areas according to claim 3, characterized in that, In S300, if the remaining capacity of the distribution transformer is less than the preset third remaining capacity limit, the smart fusion terminal of the distribution area reports the resident load alarm information in the preset area to the main station.

6. The electric vehicle charging control method based on a smart fusion terminal for distribution areas according to claim 4, characterized in that, In S300, the charging power of all charging piles with the first charging power is adjusted to the second charging power in descending order of the charging time of the charging piles. The residential load power is also acquired in real time, and the trend of residential load power change is obtained based on the residential load power. If the trend of the change in the residential load power is downward, and the remaining capacity of the distribution transformer is greater than the remaining capacity of the third distribution transformer, then the adjustment time of each charging pile that is adjusted from the first charging power to the second charging power is obtained, and the charging power of the charging piles is adjusted from the second charging power to the first charging power in descending order of the adjustment time.

7. The electric vehicle charging control method based on a smart converged terminal in a distribution area according to claim 1, characterized in that, If the remaining capacity of the distribution transformer is less than the preset minimum power limit and the charging control of each charging pile fails, a fault isolation message and a warning message are sent to the main station, and a disconnection command is sent to the smart circuit breaker corresponding to the charging pile within a preset time to control the charging pile to disconnect the power supply.

8. The electric vehicle charging control method based on a smart fusion terminal for distribution areas according to claim 1, characterized in that, The electric vehicle charging control method further includes: The system obtains the rated charging power and real-time charging power of each charging pile. If the real-time charging power is greater than the rated charging power, a disconnect command is sent to the charging pile with the real-time charging power greater than the rated charging power to control the charging pile with abnormal charging power to disconnect the power.

9. An electric vehicle charging system based on a smart converged terminal in a distribution area, characterized in that, The method includes a smart converged terminal for power distribution areas, which includes a processor, a memory, and a terminal program stored in the memory and executable on the processor. When the processor executes the terminal program, it implements the electric vehicle charging control method based on the smart converged terminal for power distribution areas as described in any one of claims 1 to 8.

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