Flexible control system and method for alternating current charging pile in transformer area

Abstract

The invention relates to the technical field of power systems, in particular to a transformer area alternating current charging pile flexible control system and method, and the system comprises an information processing control platform, a transformer area collection terminal and a charging pile load regulation and control module. The information processing control platform obtains transformer area transformer electric energy data of all transformer areas and judges the maximum available power supply capacity of the transformer areas; according to the judgment result of the maximum available power supply capacity of the transformer area, carrying out area or transformer area overload marking; according to the type of the overload mark, determining a required control strategy and a control authority main body; and executing the corresponding control strategy based on the determined control strategy, and adjusting the charging power of the AC charging pile. By judging whether the maximum power supply capacity of the transformer area is overloaded or not, the area or the transformer area with the large power supply pressure can be accurately recognized, corresponding control strategies are adopted for coping, and accurate regulation and control over the alternating current charging piles of the transformer area are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a flexible control system and method for AC charging piles in a distribution area. Background Art

[0002] As the number of electric vehicles increases, the number of charging piles, as supporting charging equipment for electric vehicles, is also increasing year-on-year. The use of charging piles is time-specific and regional. The user habit of "driving during the day and charging at night" leads to a significant increase in the charging demand of electric vehicles during the night peak period. As a result, some power equipment will be overloaded and overloaded, and some areas will face a short-term power supply shortage.

[0003] Although the power grid company has taken corresponding regulatory measures to address this phenomenon, the regulatory plan is still controlled in a "one-size-fits-all" manner and cannot meet the user's usage requirements. In addition, after preliminary research on the project, the existing DC charging piles have been able to achieve remote control through the access of electric vehicle platforms (Internet of Vehicles platforms), TCU control devices, and various types of load control equipment. However, for distributed AC charging piles with large stocks, fast incremental construction speed, concentrated charging time, and the most likely to cause load shocks to public transformers, there is still a lack of effective control technology and regulatory means because they do not have communication capabilities. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a flexible control system for AC charging piles in a substation, including an information processing control platform, a substation collection terminal and a charging pile load control module; the information processing control platform is connected to the substation collection terminal, and the substation collection terminal is connected to the charging pile load control module;

[0005] The substation collection terminal is used to collect the power data of the substation transformer and the AC charging pile operation data transmitted by all charging load control modules in the substation, and upload them to the information processing and control platform; receive the control signal from the information processing and control platform, and implement the power control of the AC charging piles in the substation;

[0006] The information processing and control platform is used to receive the collected data uploaded by the collection terminals in each area, process the data, and issue control signals and control strategies;

[0007] The charging pile load control module is used to collect the operating status, output load power and fault information of the AC charging pile; and receive the control instructions from the area collection terminal to adjust the charging output power of the AC charging pile in real time.

[0008] As a specific implementation, there are several substation area data collection terminals; the several substation area data collection terminals are respectively arranged at the substation area transformer side of each substation area of ​​the power grid.

[0009] There are several charging load control modules; several charging pile load control modules are respectively installed in each AC charging pile in each area, and the charging pile load control module is arranged between the AC charging pile charging line and the charging pile CP line.

[0010] At the same time, the present invention also provides a flexible control method for AC charging piles in a substation, which is applied to the flexible control system for AC charging piles in a substation as described above, and is characterized by comprising:

[0011] S1. The information processing control platform obtains the transformer power data of each substation, wherein the transformer power data of the substation includes the transformer power supply capacity and apparent power; and determines the maximum power supply capacity of the substation according to the transformer power data of the substation, specifically:

[0012] The total power supply capacity of the area is obtained by adding up the power supply capacity of the transformers in each area;

[0013] Compare the total power supply capacity of the substation area with the total power transmission capacity threshold of the bus, where the total power transmission capacity threshold of the bus is the total power transmission capacity of the bus multiplied by a preset proportional coefficient;

[0014] If the total power supply capacity of the substation is greater than or equal to the total power transmission capacity threshold of the bus, the maximum power supply capacity of the substation is overloaded, indicating that the total power supply capacity of each substation currently causes the power transmission bus line to be heavily overloaded;

[0015] If the total power supply capacity of the substation is less than or equal to the total power transmission capacity threshold of the bus, the maximum power supply capacity of the substation is not overloaded;

[0016] S2. Mark the area or substation as overloaded based on the result of the determination of the maximum power supply capacity of the substation;

[0017] S3. Determine the required control strategy and control authority subject according to the type of overload mark, wherein the control strategy includes regional control strategy, substation self-operation control strategy and local protection strategy;

[0018] S4. Based on the determined control strategy, execute the corresponding control strategy to adjust the charging power of the AC charging pile.

[0019] S2 describes that according to the judgment result of the maximum power supply capacity of the area, the area or area overload mark is performed, and the specific method is:

[0020] If the maximum power supply capacity of the area is overloaded, the area will be marked as overloaded; if the maximum power supply capacity of the area is not overloaded, the apparent power of the area transformer will be compared with the transformer capacity;

[0021] If the apparent power is greater than or equal to the transformer capacity, the area will be marked as overloaded; if the apparent power is less than the transformer capacity, no marking will be performed.

[0022] S4 executes the corresponding control strategy to adjust the charging power of the AC charging pile, which specifically includes:

[0023] A. Regional control strategy;

[0024] a1, obtain the overload data of the transformers in all substations and the charging power of the AC charging piles in each substation;

[0025] a2, according to the overload data of the transformer in the substation, the charging power of the AC charging piles in each substation is regulated; if the transformers in each substation are not overloaded, all the AC charging piles in each substation will simultaneously reduce the charging power by a preset proportion, and the total power supply capacity of the substation will be judged, and the charging power will be reduced cyclically until the total power supply capacity of the substation is less than the total bus transmission capacity threshold;

[0026] If the transformer of at least one area is overloaded, the charging power of all AC charging piles in the overloaded area is adjusted until the transformers of all areas are not overloaded, and then the cycle is reduced;

[0027] B. Substation self-operation control strategy;

[0028] b1, the area collection terminal stores the maximum charging power of all AC charging piles in the area, and obtains the charging power of the AC charging piles that are already running;

[0029] b2, based on a preset period, each time the charging power of each AC charging pile that has been turned on is reduced by a preset proportion, and the capacity of the transformer after the reduction is obtained in real time, until the apparent power is less than the transformer capacity, and the reduction is stopped;

[0030] C. Local protection strategy: The charging pile load control module controls the capacity of the AC charging pile according to the preset time period. The AC charging pile capacity = the maximum available capacity of the area / the number of AC charging piles that are already in operation in the area.

[0031] The substation self-operation control strategy also includes that when the substation collection terminal executes the substation self-operation control strategy, if there is a newly started AC charging pile in the substation, the charging power percentage of the AC charging pile is directly adjusted to the percentage after the charging power of all the AC charging piles that have been started is reduced, and then the b2 operation is executed.

[0032] The substation self-operation control strategy also includes when the transformer capacity is greater than the apparent power, and there are stopped AC charging piles in the substation, then based on a preset period, the charging power of the running AC charging piles is increased by a preset proportional value, and the increased substation transformer capacity is obtained in real time, and the next increased substation transformer capacity is calculated. If the next substation transformer capacity is less than the apparent power, the increase instruction is stopped.

[0033] Beneficial effects: The present invention is a flexible control system and method for AC charging piles in substations. The system realizes precise control of AC charging piles in substations through the coordinated work of the information processing control platform, substation collection terminal and charging pile load control module. The substation collection terminal can collect the power data of substation transformers and the operation data of AC charging piles in real time, and upload them to the information processing control platform to provide accurate data support for the platform. The information processing control platform can process data based on these data, issue reasonable control signals and control strategies, and realize intelligent control of AC charging piles;

[0034] By judging whether the maximum power supply capacity of the substation is overloaded, the system can accurately identify areas or substations with greater power supply pressure, and adopt corresponding control strategies to deal with them. It not only avoids heavy overload of the transmission bus line, but also ensures that the AC charging piles in the substation operate under safe and stable conditions. The method of the present invention can determine the required control strategy and control authority subject according to the type of overload mark, and based on the determined control strategy, execute the corresponding control strategy to adjust the charging power of the AC charging pile. At the same time, the method of the present invention is also scalable and customizable. By adjusting parameters such as preset ratio values ​​and preset cycles, the system can flexibly adapt to different application scenarios and charging needs. DETAILED DESCRIPTION

[0035] Exemplary embodiments of the present disclosure will be described in more detail below.

[0036] Example 1

[0037] This embodiment first provides a flexible control system for AC charging piles in an area, including an information processing control platform, an area collection terminal and a charging pile load control module. The information processing control platform is connected to the area collection terminal, and the area collection terminal is connected to the charging pile load control module. There are several area collection terminals and charging load control modules, and several area collection terminals are respectively arranged on the area transformer side of each area of ​​the power grid; several charging pile load control modules are respectively installed in each AC charging pile in each area, and the charging pile load control module is arranged between the AC charging pile charging line and the charging pile CP line.

[0038] The substation collection terminal is used to collect the power data of the substation transformer and the AC charging pile operation data transmitted by all charging load control modules in the substation, and upload them to the information processing and control platform; receive the control signal from the information processing and control platform, and implement the power control of the AC charging piles in the substation;

[0039] The information processing and control platform is used to receive the collected data uploaded by the collection terminals in each area, process the data, and issue control signals and control strategies;

[0040] The charging pile load control module is used to collect the operating status, output load power and fault information of the AC charging pile; and receive the control instructions from the area collection terminal to adjust the charging output power of the AC charging pile in real time.

[0041] Example 2

[0042] This embodiment also provides a flexible control method for AC charging piles in a substation, which is applied to the flexible control system for AC charging piles in a substation in Example 1. The specific implementation steps of the method are as follows:

[0043] S1. The information processing and control platform obtains the transformer power data of each substation and determines the maximum power supply capacity of the substation;

[0044] The information processing control platform receives the area transformer power data collected by each area collection terminal, and the area transformer power data includes the transformer power supply capacity and apparent power.

[0045] According to the obtained transformer power data of the substation, the maximum power supply capacity of the substation is determined. The specific method is as follows:

[0046] The total power supply capacity of the area is obtained by adding up the power supply capacity of the transformers in each area;

[0047] Compare the total power supply capacity of the substation area with the total power transmission capacity threshold of the bus, where the total power transmission capacity threshold of the bus is the total power transmission capacity of the bus multiplied by a preset proportional coefficient;

[0048] If the total power supply capacity of the substation is greater than or equal to the total power transmission capacity threshold of the bus, the maximum power supply capacity of the substation is overloaded, indicating that the total power supply capacity of each substation currently causes the power transmission bus line to be heavily overloaded;

[0049] If the total power supply capacity of the substation is less than or equal to the total bus transmission capacity threshold, the maximum power supply capacity of the substation is not overloaded.

[0050] S2. Based on the judgment result of the maximum power supply capacity of the area, the area or area is marked as overloaded. The specific method is as follows:

[0051] If the maximum power supply capacity of the area is overloaded, the area will be marked as overloaded; if the maximum power supply capacity of the area is not overloaded, the apparent power of the area transformer will be compared with the transformer capacity;

[0052] If the apparent power is greater than or equal to the transformer capacity, the area will be marked as overloaded; if the apparent power is less than the transformer capacity, no marking will be performed.

[0053] S3. Determine the required control strategy and control authority subject according to the type of overload mark, wherein the control strategy includes regional control strategy, substation self-operation control strategy and local protection strategy;

[0054] When the overload mark type is a regional overload mark, it is determined that the required control strategy is a regional control strategy. The control authority subject is the information processing control platform. The information processing control platform issues the regional control strategy required to be executed by each area to control each area to perform charging pile power regulation;

[0055] When the overload mark type is a substation overload mark, it is determined that the required control strategy is a substation self-operation control strategy, and the control authority subject is delegated to the substation acquisition terminal, which issues the substation self-operation control strategy required to be executed by the substation;

[0056] When there is no overload mark, it is determined that the required control strategy is a local protection strategy, and the control authority subject is delegated from the substation collection terminal to each charging pile load control module, and the charging pile load control module executes the main body protection strategy.

[0057] S4. Based on the determined control strategy, execute the corresponding control strategy to adjust the charging power of the AC charging pile;

[0058] The executing of the corresponding control strategy to adjust the charging power of the AC charging pile specifically includes:

[0059] A. Regional control strategy;

[0060] a1, obtain the overload data of the transformers in all substations and the charging power of the AC charging piles in each substation;

[0061] a2, according to the overload data of the transformer in the substation, the charging power of the AC charging piles in each substation is regulated; if the transformers in each substation are not overloaded, all the AC charging piles in each substation will simultaneously reduce the charging power by a preset proportion, and the total power supply capacity of the substation will be judged, and the charging power will be reduced cyclically until the total power supply capacity of the substation is less than the total bus transmission capacity threshold;

[0062] If the transformer in at least one area is overloaded, the charging power of all AC charging piles in the overloaded area will be adjusted until the transformers in all areas are not overloaded, and then the cycle reduction will be performed.

[0063] B. Substation self-operation control strategy;

[0064] b1, the area collection terminal stores the maximum charging power of all AC charging piles in the area, and obtains the charging power of the AC charging piles that are already running;

[0065] b2, based on a preset period, each time the charging power of each AC charging pile that has been running is reduced by a preset proportion value, and the transformer capacity after the reduction is obtained in real time until the apparent power is less than the transformer capacity, and the reduction is stopped.

[0066] At the same time, the substation self-operation control strategy also includes that when the substation acquisition terminal executes the substation self-operation control strategy, if there is a newly started AC charging pile in the substation, the charging power percentage of the AC charging pile is directly adjusted to the percentage after the charging power of all the AC charging piles that have been started is reduced, and then the b2 operation is executed.

[0067] The substation self-operation control strategy also includes when the transformer capacity is greater than the apparent power, and there are stopped AC charging piles in the substation, then based on a preset period, the charging power of the running AC charging piles is increased by a preset proportional value, and the increased substation transformer capacity is obtained in real time, and the next increased substation transformer capacity is calculated. If the next substation transformer capacity is less than the apparent power, the increase instruction is stopped.

[0068] If all AC charging piles in the area stop charging, the charging power limit will be lifted and restored to the maximum charging power.

[0069] C. Local protection strategy: The charging pile load control module controls the capacity of the AC charging pile according to the preset time period. The AC charging pile capacity = the maximum available capacity of the area / the number of AC charging piles that are already in operation in the area.

Claims

1. A flexible control system for AC charging piles in a station area, characterized in that: It includes an information processing control platform, a substation collection terminal and a charging pile load control module; the information processing control platform is connected to the substation collection terminal, and the substation collection terminal is connected to the charging pile load control module; The substation collection terminal is used to collect the power data of the substation transformer and the AC charging pile operation data transmitted by all charging load control modules in the substation, and upload them to the information processing and control platform; receive the control signal from the information processing and control platform, and implement the power control of the AC charging piles in the substation; The information processing and control platform is used to receive the collected data uploaded by the collection terminals in each area, process the data, and issue control signals and control strategies; Charging pile load control module, used to collect the operating status, output load power and fault information of the AC charging pile; It also receives control instructions from the area data collection terminal and adjusts the charging output power of the AC charging pile in real time.

2. The AC charging pile soft control system according to claim 1 is characterized in that: There are several substation collection terminals; the several substation collection terminals are respectively arranged at the substation transformer side of each substation in the power grid.

3. The AC charging pile soft control system according to claim 1 is characterized in that: There are several charging load control modules; several charging pile load control modules are respectively installed in each AC charging pile in each area, and the charging pile load control module is arranged between the AC charging pile charging line and the charging pile CP line.

4. A flexible control method for AC charging piles in a substation, applied to the flexible control system for AC charging piles in a substation according to any one of claims 1 to 3, characterized in that: include: S1. The information processing control platform obtains the power data of transformers in each substation, wherein the power data of transformers in each substation includes the power supply capacity and apparent power of the transformer; The maximum power supply capacity of the area is determined based on the power data of the area transformer, specifically: The total power supply capacity of the area is obtained by adding up the power supply capacity of the transformers in each area; Compare the total power supply capacity of the substation area with the total power transmission capacity threshold of the bus, where the total power transmission capacity threshold of the bus is the total power transmission capacity of the bus multiplied by a preset proportional coefficient; If the total power supply capacity of the substation is greater than or equal to the total power transmission capacity threshold of the bus, the maximum power supply capacity of the substation is overloaded, indicating that the total power supply capacity of each substation currently causes the power transmission bus line to be heavily overloaded; If the total power supply capacity of the substation is less than or equal to the total power transmission capacity threshold of the bus, the maximum power supply capacity of the substation is not overloaded; S2. Mark the area or substation as overloaded based on the result of the determination of the maximum power supply capacity of the substation; S3. Determine the required control strategy and control authority subject according to the type of overload mark, wherein the control strategy includes regional control strategy, substation self-operation control strategy and local protection strategy; S4. Based on the determined control strategy, execute the corresponding control strategy to adjust the charging power of the AC charging pile.

5. The method for soft control of AC charging piles in a substation according to claim 4, characterized in that: S2 describes that according to the judgment result of the maximum power supply capacity of the area, the area or area overload mark is performed, and the specific method is: If the maximum power supply capacity of the area is overloaded, the area will be marked as overloaded; if the maximum power supply capacity of the area is not overloaded, the apparent power of the area transformer will be compared with the transformer capacity; If the apparent power is greater than or equal to the transformer capacity, the area will be marked as overloaded; if the apparent power is less than the transformer capacity, no marking will be performed.

6. The method for soft control of AC charging piles in a station area according to claim 4, characterized in that: S4 executes the corresponding control strategy to adjust the charging power of the AC charging pile, which specifically includes: A. Regional control strategy; a1, obtain the overload data of the transformers in all substations and the charging power of the AC charging piles in each substation; a2, according to the overload data of the transformer in the substation, the charging power of the AC charging piles in each substation is regulated; if the transformers in each substation are not overloaded, all the AC charging piles in each substation will simultaneously reduce the charging power by a preset proportion, and the total power supply capacity of the substation will be judged, and the charging power will be reduced cyclically until the total power supply capacity of the substation is less than the total bus transmission capacity threshold; If the transformer of at least one area is overloaded, the charging power of all AC charging piles in the overloaded area is adjusted until the transformers of all areas are not overloaded, and then the cycle is reduced; B. Substation self-operation control strategy; b1, the area collection terminal stores the maximum charging power of all AC charging piles in the area, and obtains the charging power of the AC charging piles that are already running; b2, based on a preset period, each time the charging power of each AC charging pile that has been turned on is reduced by a preset proportion, and the capacity of the transformer after the reduction is obtained in real time, until the apparent power is less than the transformer capacity, and the reduction is stopped; C. Local protection strategy: The charging pile load control module controls the capacity of the AC charging pile according to the preset time period. The AC charging pile capacity = the maximum available capacity of the area / the number of AC charging piles that are already in operation in the area.

7. The method for soft control of AC charging piles in a substation according to claim 6, characterized in that: The substation self-operation control strategy also includes that when the substation collection terminal executes the substation self-operation control strategy, if there is a newly started AC charging pile in the substation, the charging power percentage of the AC charging pile is directly adjusted to the percentage after the charging power of all the AC charging piles that have been started is reduced, and then the b2 operation is executed.

8. The method for soft control of AC charging piles in a substation according to claim 6, characterized in that: The substation self-operation control strategy also includes when the transformer capacity is greater than the apparent power, and there are stopped AC charging piles in the substation, then based on a preset period, the charging power of the running AC charging piles is increased by a preset proportional value, and the increased substation transformer capacity is obtained in real time, and the next increased substation transformer capacity is calculated. If the next substation transformer capacity is less than the apparent power, the increase instruction is stopped.