A direct current charging pile group intelligent scheduling method and system

Abstract

The present application relates to the technical field of power distribution optimization, in particular to a DC charging pile group intelligent scheduling method and system, comprising the following steps: determining the power supply margin based on the distribution transformer, the AC power distribution input end and the DC bus state, forming the pile group proportion distribution in combination with the vehicle charging interface feedback, generating the power adjustment quota according to the difference between the last period instruction and the rectifier power unit output, then converting the pile end current control parameter according to the allowed output interval of each pile, and forming the execution deviation change index in combination with the pile end feedback. The present application establishes a continuous correlation between the bus distributable capacity and the pile group output structure, integrates the power supply state change and the execution state of each pile into a unified regulation link, centrally collects and processes the instruction deviation, introduces the subsequent power distribution process, drives the output of each charging pile to converge to the power supply capacity constraint interval, and dynamically corrects the distribution result according to the pile group occupation structure, thereby maintaining the stability of the corresponding relationship between the power supply side and the load side.

Description

Technical Field

[0001] This invention relates to the field of power allocation optimization technology, and in particular to an intelligent scheduling method and system for DC charging pile groups. Background Technology

[0002] The field of power allocation optimization technology involves the rational allocation and regulation of electrical power in power supply and consumption systems. It mainly focuses on power allocation strategies, load balancing control, grid operation regulation, and energy utilization configuration in multi-load scenarios. Its aim is to coordinate and manage various power consumption units in complex power environments, and it is widely used in industries such as electric vehicle charging systems, smart grids, power dispatching systems, and energy management systems. Among these, the intelligent scheduling method for DC charging pile groups refers to a method for unified allocation and management of charging tasks and power supply resources in a system composed of multiple DC charging piles. This typically involves analyzing the operating status, load demand, and power supply capacity of each charging pile, and combining scheduling rules and control strategies to organize and coordinate the charging process to achieve collaborative operation among multiple charging units.

[0003] In the current process of DC charging pile group scheduling, static allocation logic is mostly used to divide the power of each charging pile. There is a time-series disconnect between the power supply side status update and the scheduling execution process. Changes in the bus power supply capacity are difficult to be synchronously fed back to the control links of each charging pile. When the actual output of each pile deviates from the allocation result, there is no unified correction mechanism. This causes some charging piles to continuously deviate from the predetermined allocation range, the power sharing structure within the pile group to drift, the bus load distribution to become unstable, and the matching relationship between the power supply side and the power consumption side to gradually become unbalanced. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an intelligent scheduling method and system for DC charging pile groups.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an intelligent scheduling method for DC charging pile groups, comprising the following steps:

[0006] S1: Based on the distribution transformer of the charging pile group, analyze the relationship between rated capacity and load current, calculate the difference between AC power input power and bus output power, determine the distribution of power supply occupied area, and obtain the power supply margin index.

[0007] S2: Based on the power supply margin index, analyze the voltage and current feedback status of the vehicle charging interface, calculate the output level of a single pile, compare the positional relationship of the output of a single pile in the total output sequence of the pile group, screen the power occupancy ratio distribution, and obtain the pile group proportion distribution.

[0008] S3: Based on the pile group proportion distribution, calculate the difference between the commanded power and the output of the rectifier power unit in the previous cycle, compare the deviation direction of each pile, filter the positive and negative deviation sets, determine the distribution relationship of the deviation in the bus power supply capacity, and obtain the power regulation quota data.

[0009] S4: Based on the power regulation quota data, compare the allowable output range of each DC charging pile, filter the power quota within the range, calculate the relationship between the vehicle charging interface voltage and the power quota, adjust the output current setting, and obtain the pile end current control parameters.

[0010] S5: Based on the pile end current control parameters, analyze the relationship between the set current and the pile end feedback current, calculate the current difference ratio, compare the difference in the periodic sequence change trend, screen the direction of execution deviation change, and obtain the execution deviation change index.

[0011] The present invention is improved in that the power supply margin index includes the remaining power supply capacity, load occupancy ratio and power supply margin range; the pile group proportion distribution includes the power ratio of a single pile, the pile group ranking weight and the power sharing ratio; the power adjustment quota data includes the deviation compensation amount, the power allocation weight and the adjustment quota ratio; the pile end current control parameters include the target current amplitude, the current adjustment range and the current control ratio; and the execution deviation change index includes the current deviation amplitude, the deviation change trend and the execution consistency degree.

[0012] The present invention is improved in that the steps for obtaining the power supply margin index are specifically as follows:

[0013] S111: Based on the distribution transformer of the charging pile group, obtain the rated capacity and load current data, compare the power transfer status of the AC distribution input terminal and the DC bus output power, filter the corresponding interval of load change, determine the current load location, and obtain the load section identifier.

[0014] S112: Based on the load section identifier, analyze the relationship between the DC bus voltage and total current combination, compare the bus occupancy position under rated capacity constraints, screen the connection relationship of the power transmission occupancy interval, determine the interval switching status, adjust the corresponding boundary of each power transmission occupancy interval, and obtain the boundary allocation interval.

[0015] S113: Based on the boundary allocation interval, compare the current load allocation interval with the power transfer status of the AC input terminal and DC bus, filter the segments corresponding to the remaining power supply capacity, determine the margin segment where the load occupancy ratio is located, adjust the segment merging relationship, and obtain the power supply margin index.

[0016] The present invention is improved in that the step of obtaining the distribution of the pile group proportion is specifically as follows:

[0017] S211: Based on the power supply margin index, compare the corresponding states of the vehicle charging interface readback voltage and readback current, calculate the current output power of each charging pile, filter the differences in output states, determine the operating category of each pile, and obtain the power status of a single pile.

[0018] S212: Based on the power status of the single pile, calculate the proportion of the output power of each charging pile in the total output of the pile group, compare the order of the power proportions of each pile, filter the proportion arrangement level, determine the sequence order of each charging pile in the total output of the pile group, and obtain the power sorting position.

[0019] S213: Based on the power ranking, compare the power proportion of each charging pile in the segment, filter the range of each pile in the power supply capacity of the pile group, determine the power sharing of each pile, adjust the corresponding relationship of each pile's bearing range, and obtain the distribution of the proportion of the pile group.

[0020] The present invention is improved in that the step of obtaining the power regulation quota data is specifically as follows:

[0021] S311: Based on the pile group proportion distribution, analyze its correspondence with the command power of the previous cycle, compare the deviation direction of the actual output of the rectifier power unit and the command power of each pile, filter the same-direction deviation records and opposite-direction deviation records, and obtain the deviation direction proportion.

[0022] S312: Based on the aforementioned deviation direction proportion, analyze the power correlation with DC bus voltage, total bus current, and bus margin range, and calculate the mapping degree of each pile deviation within the bus margin range using the formula:

[0023] ;

[0024] Obtain the residual mapping coefficient ,in, This indicates the total number of charging stations currently in operation. Indicates the first The commanded power of the charging pile in the previous cycle. Indicates the first The actual output of the rectifier power unit corresponding to each charging pile. This indicates the current operating voltage value of the DC bus. This indicates the current total output current of the DC bus. This indicates the remaining power supply capacity that can be continuously allocated to the DC bus. This represents the average value of the voltage read back from each charging station port. This indicates the number of online rectifier modules, specifically the total number of rectifier modules currently in normal operation and capable of outputting power. This indicates the total number of rectifier modules configured, referring to the total number of rectifier modules configured in the charging pile group system;

[0025] S313: Based on the aforementioned margin mapping coefficient, compare the mapping position of each charging pile with the order of the pile group's proportion distribution, determine the range of compensation share and reduction share, adjust the power allocation quota of each pile, and obtain power adjustment quota data.

[0026] The present invention is improved in that the steps for obtaining the pile end current control parameters are specifically as follows:

[0027] S411: Based on the power regulation quota data, analyze the correspondence between the output intervals of each DC charging pile power unit, compare the interval positions of each power quota, filter the power quotas that fall into the allowable interval, determine the status of the power quotas that exceed the allowable interval, and obtain the quota interval index table.

[0028] S412: Based on the quota interval index table, compare the corresponding current structure of each power quota under the current interface voltage, calculate the output current adjustment direction of each charging pile, filter the current setting form classification results, determine the pile end output current adaptation status, and obtain the current setting mapping group.

[0029] S413: Based on the current setting mapping group, compare the current setting form of each pile with the power unit output range adaptation status, adjust the pile end output current setting form, filter the current adjustment range correspondence, determine the current control ratio belonging status, and obtain the pile end current control parameters.

[0030] The present invention is improved in that the step of obtaining the execution deviation change index is specifically as follows:

[0031] S511: Based on the pile end current control parameters, analyze the correspondence with the pile end readback current, compare the deviation direction of the target current amplitude and the readback current, calculate the set current difference ratio of each scheduling cycle, filter segments with consistent deviation direction, determine the current deviation status, and obtain the current deviation trajectory.

[0032] S512: Based on the current deviation trajectory, compare the changes in the ratio of the difference between the previous and subsequent cycles, calculate the distribution relationship between the segments changing in the same direction and the segments changing alternately, screen the continuous segments of the change direction, determine the trend status of each segment, and obtain the deviation trend partition.

[0033] S513: Based on the deviation trend partition, compare the deviation direction continuation status of adjacent cycles, calculate the difference ratio convergence relationship, screen the direction stable segment and the direction switching segment, determine the execution consistency attribution status, and obtain the execution deviation change index.

[0034] The present invention is improved in that the load current refers to the actual current flowing through the output side of the distribution transformer, which represents the current load level; the input power refers to the power of electrical energy transmitted from the AC power distribution input terminal to the charging station; and the output power of the bus refers to the total output power distributed by the DC bus to each charging pile.

[0035] A smart scheduling system for DC charging pile groups, the system comprising:

[0036] The power supply verification module is based on the distribution transformer of the charging pile group. It analyzes the relationship between rated capacity and load current, calculates the difference between the input power of AC distribution terminal and the output power of bus, determines the distribution of power supply occupied area, and obtains the power supply margin index.

[0037] Based on the power supply margin index, the proportion collection module analyzes the voltage and current feedback status of the vehicle charging interface, calculates the output level of a single pile, compares the positional relationship of the output of a single pile in the total output sequence of the pile group, filters the power occupancy ratio distribution, and obtains the proportion distribution of the pile group.

[0038] Based on the distribution of the pile group, the quota allocation module calculates the difference between the commanded power and the output of the rectifier power unit in the previous cycle, compares the deviation direction of each pile, filters the positive and negative deviation sets, determines the distribution relationship of the deviation in the bus power supply capacity, and obtains the power regulation quota data.

[0039] Based on the power regulation quota data, the current conversion module compares the allowable output range of each DC charging pile, filters the power quota within the range, calculates the relationship between the vehicle charging interface voltage and the power quota, adjusts the output current setting, and obtains the pile end current control parameters.

[0040] Based on the pile end current control parameters, the deviation determination module analyzes the relationship between the set current and the pile end feedback current, calculates the current difference ratio, compares the difference in the periodic sequence change trend, filters the direction of execution deviation change, and obtains the execution deviation change index.

[0041] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0042] In this invention, a continuous associated path is constructed by the busbar's allocable capacity and the output structure of the charging pile group. The changes in power supply status and the execution status of each pile are incorporated into the same adjustment link. Command deviations are uniformly collected and processed, and the deviation information is used in the subsequent power allocation process. This allows the output of each charging pile to gradually converge to the power supply capacity constraint during the adjustment process. At the same time, the allocation results are dynamically corrected by combining the occupancy structure of the charging pile group, so that the power sharing relationship of each pile is synchronously reconstructed as the power supply conditions change, ensuring a stable correspondence between the power supply side and the load side. Attached Figure Description

[0043] Figure 1 This is a flowchart of the main steps of the present invention;

[0044] Figure 2 This is a flowchart illustrating the process of obtaining the power supply margin index in this invention.

[0045] Figure 3 This is a flowchart illustrating the process of obtaining the distribution of the proportion of pile groups in this invention.

[0046] Figure 4 This is a flowchart illustrating the process of obtaining power regulation quota data in this invention.

[0047] Figure 5 This is a flowchart illustrating the acquisition of pile end current control parameters in this invention.

[0048] Figure 6 This is a flowchart of the process for obtaining the deviation change index in this invention. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0050] In the description of this invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] All user-related information involved in this invention (including but not limited to biometric information, identity verification information, behavioral data, device information, and other data that can be used for identity verification and personalized services) is collected and processed with the user's full knowledge and voluntary consent. The use of data is limited to purposes necessary for providing the technical services of this invention, and reasonable technical and management measures will be taken to ensure the security and confidentiality of users' personal information in terms of information protection and privacy.

[0052] Example

[0053] Please see Figure 1 This invention provides a technical solution: an intelligent scheduling method for DC charging pile groups, comprising the following steps:

[0054] S1: Based on the distribution transformer of the charging pile group, analyze the relationship between rated capacity and load current, calculate the difference between the input power of the AC distribution input terminal and the output power of the bus, compare the relationship between the DC bus voltage, total current combination state and rated capacity, determine the distribution of the power supply occupied area, adjust the distribution boundary range, and obtain the power supply margin index.

[0055] S2: Based on the power supply margin index, analyze the readback voltage and readback current of the vehicle charging interface to form the single pile output status, determine the sequence ranking position of the single pile output in the total output of the pile group, filter the power occupancy ratio distribution, determine the bearing range of each pile, and obtain the pile group proportion distribution.

[0056] S3: Based on the distribution of the proportion of pile groups, calculate the difference between the command power of the previous cycle and the output of the rectifier power unit, compare the distribution of the deviation direction of each pile, filter the positive and negative deviation sets, determine the mapping relationship between the deviation in the DC bus and the bus margin range, adjust the power allocation quota, and obtain the power regulation quota data.

[0057] S4: Based on the power regulation quota data, compare the allowable output range of each DC charging pile power unit, filter the power quotas that fall within the range, calculate the correspondence between the vehicle charging interface voltage and the power quota, adjust the setting expression of the pile end output current, and obtain the pile end current control parameters.

[0058] S5: Based on the pile end current control parameters, analyze the relationship with the pile end readback current, calculate the difference ratio between the set current and the readback current, compare the changing trend of the difference ratio in the periodic sequence, screen the direction of execution deviation change, judge the degree of deviation stability, and obtain the execution deviation change index.

[0059] Power supply margin indicators include remaining power supply capacity, load occupancy ratio, and power supply margin range; pile group proportion distribution includes single pile power ratio, pile group ranking weight, and power sharing ratio; power regulation quota data includes deviation compensation amount, power allocation weight, and regulation quota ratio; pile end current control parameters include target current amplitude, current regulation range, and current control ratio; execution deviation change indicators include current deviation amplitude, deviation change trend, and execution consistency degree.

[0060] In S1, the load current refers to the actual current flowing through the output side of the distribution transformer, which is used to characterize the current load level; the input power refers to the power of electrical energy transmitted from the AC distribution input terminal to the charging station; the output power of the bus refers to the total output power distributed by the DC bus to each charging pile; the total current combination state refers to the operating state composed of the DC bus voltage and the total current; the power supply occupancy range distribution refers to the location segment of the current load within the rated capacity range; and the allocation boundary range refers to the power range that is allowed to continue to be allocated under the constraints of power supply capacity.

[0061] In S2, readback voltage refers to the output voltage detected and fed back by the charging pile from the vehicle charging interface; readback current refers to the output current detected and fed back by the charging pile from the vehicle charging interface; single pile output status refers to the current output power and operating status of a single charging pile; sequence sorting position refers to the relative position of the single pile output in the overall output of the pile group; power occupancy ratio distribution refers to the proportion of each charging pile output in the total output of the pile group; and each pile's service area refers to the corresponding allocation section of each charging pile in the overall power supply capacity.

[0062] In S3, the command power refers to the target output power issued by the main controller in the previous scheduling cycle; the rectifier power unit output refers to the actual output capacity provided by the rectifier module to the DC bus; the deviation direction distribution refers to the distribution state of the actual output of each charging pile being higher or lower than the command; the positive and negative deviation sets refer to the classification sets formed by the actual output being lower or higher than the command; the margin range refers to the power supply space that the DC bus can continue to allocate; and the mapping relationship refers to the corresponding relationship of allocating the deviation of each charging pile to the remaining power supply capacity of the bus according to the rules.

[0063] In S4, the power unit refers to the functional module inside the charging pile used for power conversion and output control; the output range refers to the minimum and maximum output power range that the charging pile is allowed to operate in; the power quota refers to the target output power quota allocated to a single charging pile; and the setting expression form refers to the way to convert the power target into a device control quantity.

[0064] In S5, the readback current relationship refers to the correspondence between the set current and the charging pile feedback current; the difference ratio refers to the degree of deviation between the set current and the actual current; the change trend of the cycle sequence refers to the trajectory of the deviation in the continuous scheduling cycle; the direction of the execution deviation change refers to the trend of the deviation increasing or decreasing over time; and the degree of deviation stability refers to the consistency of the deviation fluctuation in multiple cycles.

[0065] Please see Figure 2 The specific steps for obtaining the power supply margin index are as follows:

[0066] S111: Based on the distribution transformer of the charging pile group, obtain the rated capacity and load current data, compare the power transfer status of the AC distribution input terminal and the DC bus output power, filter the corresponding interval of load change, determine the current load location, and obtain the load section identifier.

[0067] The process of obtaining rated capacity and load current data based on the distribution transformer of the charging pile group involves setting the transformer's rated capacity to 160kVA. The three-phase input current is read as 180A by the on-site meter, and the grid voltage is read as 400V. Based on the three-phase power conversion rules, the AC input power is calculated to be approximately 124.7kW. Then, the DC side acquisition module obtains the bus voltage of 750V and the total current of 150A. Multiplying these two values ​​yields the bus output power of 112.5kW. Subtracting the input and output power values ​​one by one yields a difference of 12.2kW. The load current of 180A is then compared with the rated capacity... The load ratio is calculated to be 0.78 using a constant current of 231A. The load ratio is then divided into intervals of 0 to 0.3, 0.3 to 0.6, 0.6 to 0.9, and 0.9 to 1.0. 0.78 is assigned to the interval of 0.6 to 0.9. At the same time, the power difference is divided into intervals of 0 to 5kW, 5 to 15kW, and above 15kW. 12.2kW is assigned to the interval of 5 to 15kW. The load ratio intervals and power difference intervals are combined and matched. The corresponding number is found through a preset interval table to locate the third load segment. The upper and lower limits of the corresponding segment are recorded to obtain the load segment identifier.

[0068] S112: Based on the load section identifier, analyze the combination relationship with the DC bus voltage and total current, compare the bus occupancy position under the rated capacity constraint, screen the connection relationship of the power transmission occupancy section, determine the section switching status, adjust the corresponding boundary of each power transmission occupancy section, and obtain the boundary allocation section.

[0069] Based on the load section identification, the DC bus voltage and total current are combined. The collected 750V and 150A are combined to represent the current operating status. The ratio of the bus output power of 112.5kW to the rated capacity of 160kVA is calculated to be 0.70. This ratio is divided into three intervals: 0 to 0.5, 0.5 to 0.8, and 0.8 to 1.0. 0.70 is assigned to the 0.5 to 0.8 interval. According to the load section number, the corresponding mapping relationship is found, and the current status is positioned as a medium-high load position. At the same time, the power supply occupancy interval is set to 0. The intervals from 0.4 to 0.7 and from 0.7 to 1.0 are defined. 0.70 is positioned at the second and third boundary. The difference between 0.70 and the boundary of 0.7 is calculated to be 0. When the difference is less than 0.02, it is determined to be an interval switching state. This state is marked as boundary overlap. The original interval from 0.4 to 0.7 is adjusted to 0.4 to 0.68, and 0.7 to 1.0 is adjusted to 0.68 to 1.0. 0.70 is then mapped to the new interval to obtain its belonging to the third partition. The updated boundary ranges of each interval are recorded to obtain the boundary allocation interval.

[0070] S113: Based on the boundary allocation interval, compare the current load allocation interval with the power transfer status of the AC input terminal and DC bus, filter the corresponding segments of the remaining power supply capacity, determine the margin segment where the load occupancy ratio is located, adjust the segment merging relationship, and obtain the power supply margin index.

[0071] Based on the boundary allocation interval, load interval and power status matching processing is performed. The current load segment number is associated with the input power of 124.7kW and the output power of 112.5kW. The remaining power supply capacity is calculated as 160 minus 112.5, resulting in 47.5kW. The remaining capacity is divided into three intervals: 0 to 20kW, 20 to 50kW, and above 50kW. 47.5kW is assigned to the 20 to 50kW interval. At the same time, the ratio of output power to input power is calculated to be approximately 0.90. This ratio is then divided into three ranges: 0 to 0.6, 0.6 to 0.85, and 0.85 to 1. The remaining capacity range is divided into three intervals: 0.90 and 0.85. The remaining capacity range is matched with the occupancy ratio range to obtain the correspondence between medium remaining capacity and high occupancy. The ratio of remaining capacity to rated capacity is calculated to obtain 0.30, which is divided into three intervals: 0 to 0.2, 0.2 to 0.4, and above 0.4. 0.30 is assigned to the 0.2 to 0.4 interval. The load segment number, capacity segment, and margin segment are numbered and combined to form code 322 according to segment number 3, capacity number 2, and margin number 2. This code is output as the power supply margin indicator.

[0072] Please see Figure 3 The specific steps for obtaining the distribution of pile group proportions are as follows:

[0073] S211: Based on the power supply margin index, compare the corresponding states of the vehicle charging interface readback voltage and readback current, calculate the current output power of each charging pile, filter the differences in output state, determine the operating category of each pile, and obtain the power state of a single pile.

[0074] The system processes the read-back voltage and current status of the vehicle charging interface. The remaining capacity range of 20 to 50 kW corresponding to the power supply margin index coded 322 obtained in the previous stage is used as the current power allocation upper limit constraint. The read-back voltage and current data of each charging pile interface are read one by one. For example, pile 1 reads voltage 720V and current 80A, pile 2 reads voltage 700V and current 60A, and pile 3 reads voltage 750V and current 40A. A multiplication operation is performed on each set of data to obtain the output power of each pile: pile 1 is 57.6kW, pile 2 is 42kW, and pile 3 is 30kW. The power values ​​of each pile are arranged into an array [57.6, 42, 30]. A difference operation is performed on the array to obtain adjacent differences of 15.6kW and 12kW, respectively. The difference range is divided into 0 to 10kW. For 10 to 20kW and above 20kW, 15.6kW and 12kW are both classified into the 10 to 20kW range. The state difference threshold is set to 10kW. When the difference is greater than 10kW, it is marked as a significant difference. Pile 1 and pile 2, and pile 2 and pile 3 are marked as different states. Then, the output power of each pile is compared with the upper limit of the power supply margin. 57.6kW exceeds the upper limit of 50kW and is marked as a high load operation category. 42kW is in the 20 to 50kW range and is marked as a medium load operation category. 30kW is also marked as a medium load operation category. The classification results are numbered and mapped. High load is set to 1, medium load is set to 2, and low load is set to 3. Pile 1 is numbered as 1, and piles 2 and 3 are numbered as 2. The number is bound to the corresponding power data to obtain the power status of a single pile.

[0075] S212: Based on the power status of a single charging pile, calculate the proportion of the output power of each charging pile in the total output of the pile group, compare the order of the power proportions of each pile, filter the proportion arrangement level, determine the sequence order of each charging pile in the total output of the pile group, and obtain the power sorting position.

[0076] Based on the power status of individual charging piles, the proportion of each charging pile's output power in the total output of the pile group is processed. The output powers of piles 1, 2, and 3 are 57.6kW, 42kW, and 30kW respectively. The total output power is 129.6kW. The proportion of each pile's power is divided by the total output power: 0.444 for pile 1, 0.324 for pile 2, and 0.231 for pile 3. The proportion results are formed into an array [0.444, 0.324, 0.231]. The array is sorted in descending order to obtain the sorted sequence pile 1, pile 2, pile 3. At the same time, the mapping relationship between the index before sorting and the position after sorting is recorded. The sorted positions are numbered 1, 2, and 3. The proportion interval is then processed. The power levels are divided into three categories: 0 to 0.25, 0.25 to 0.4, and above 0.4. 0.444 is assigned to the above 0.4 category, 0.324 to the 0.25 to 0.4 category, and 0.231 to the 0 to 0.25 category. The corresponding level numbers for each category are assigned as high level, medium level, and low level, with values ​​of 1, 2, and 3 respectively. Pile 1 is assigned level 1, pile 2 as level 2, and pile 3 as level 3. The sorting position number and level number are combined to form a two-dimensional identifier, for example, pile 1 as (1,1), pile 2 as (2,2), and pile 3 as (3,3). This combination determines the sequence position of each charging pile in the pile group, thus obtaining the power sorting position.

[0077] S213: Based on the power ranking, compare the power proportion of each charging pile in the segment, filter the range of each pile in the power supply capacity of the pile group, determine the power sharing of each pile, adjust the corresponding relationship of each pile's bearing range, and obtain the pile group proportion distribution.

[0078] Based on the power ranking, the power percentage of each charging pile is matched with its service area. The ranking results (1,1), (2,2), and (3,3) are associated with the corresponding percentage intervals. The power supply capacity of the charging pile group of 129.6kW is divided into three service areas: Section 1 is set to 0% to 40%, Section 2 to 40% to 75%, and Section 3 to 75% to 100%. The percentages of each pile (0.444, 0.324, and 0.231) are mapped to the corresponding sections. 0.444 is assigned to Section 2, 0.324 to Section 2, and 0.231 to Section 1. The piles within the same section are grouped together to obtain Section 1 containing pile 3, and Section 2 containing piles 1 and 2. A service area threshold is set for each section. The maximum share ratio for section one is set to 0.3, and the maximum share ratio for section two is set to 0.5. The current share ratio of pile 1 (0.444) is compared with the upper limit of section two (0.5). If it is less than the upper limit, the original allocation is maintained. The share ratio of pile 2 (0.324) is compared with the lower limit of section two (0.4). If it is less than the lower limit, it is marked as an adjustable object. Pile 2 is tentatively moved to section one, and its share ratio is adjusted to 0.28. At the same time, the share ratio of pile 3 is adjusted from 0.231 to 0.27, so that the total share ratio of section one reaches 0.55 and the boundary is redefined from 0 to 0.55. The updated sections are remapped to the positions of each pile to form a new share ratio correspondence. The final combination of the sections to which each pile belongs and its share ratio is output to obtain the pile group share distribution.

[0079] Please see Figure 4 The specific steps for obtaining power regulation quota data are as follows:

[0080] S311: Based on the distribution of the pile group, analyze its correspondence with the command power of the previous cycle, compare the deviation direction of the actual output of the rectifier power unit and the command power of each pile, filter the records of deviation in the same direction and the records of deviation in the opposite direction, and obtain the proportion of deviation direction.

[0081] The commanded power from the previous cycle was set to 60kW for pile 1, 45kW for pile 2, and 25kW for pile 3. Simultaneously, the current rectifier power unit output allocation was read as 57.6kW for pile 1, 42kW for pile 2, and 30kW for pile 3. For each pile, the actual output was subtracted from the commanded power to obtain the deviation value: -2.4kW for pile 1, -3kW for pile 2, and +5kW for pile 3. The deviation values ​​were divided into directional ranges: values ​​greater than 0 were defined as positive deviations, and values ​​less than 0 were defined as negative deviations. Pile 1 and pile 2 were classified as negative deviations, and pile 3 as a positive deviation. The absolute value of the deviation was then divided into ranges from 0 to 3kW. For the three levels up to 6kW and above, 2.4kW is classified into the first interval, 3kW into the second interval, and 5kW into the third interval. The deviation direction is statistically counted, with positive deviation counted as 1 and negative deviation counted as 2. Using the total number of piles (3) as the baseline, the proportion is calculated. The proportion of positive deviation is 1 divided by 3, which is approximately 0.33, and the proportion of negative deviation is 2 divided by 3, which is approximately 0.67. This proportion is compared with a preset threshold of 0.5. When the proportion is greater than 0.5, it is marked as the dominant deviation direction. The negative deviation is marked as the dominant direction, and the positive deviation is marked as the secondary direction. The deviation direction and its proportion data of each pile are combined and recorded to obtain the deviation direction proportion.

[0082] S312: Based on the proportion of deviation direction, analyze the power correlation with DC bus voltage, total bus current, and bus margin range, and calculate the mapping degree of each pile deviation within the bus margin range using the formula:

[0083] ;

[0084] Obtain the residual mapping coefficient ,in, This indicates the total number of charging stations currently in operation. Indicates the first The commanded power of the charging pile in the previous cycle. Indicates the first The actual output of the rectifier power unit corresponding to each charging pile. This indicates the current operating voltage value of the DC bus. This indicates the current total output current of the DC bus. This indicates the remaining power supply capacity that can be continuously allocated to the DC bus, corresponding to the power supply margin index. This represents the average value of the voltage read back from each charging station port. This indicates the number of online rectifier modules, specifically the total number of rectifier modules currently in normal operation and capable of outputting power. This indicates the total number of rectifier modules configured, referring to the total number of rectifier modules (including online and offline) configured in the charging pile group system.

[0085] This formula is based on the ratio of the numerator (total deviation) to the denominator (the sum of the current total power and remaining capacity of the busbar), reflecting the proportion of the deviation relative to the total capacity of the busbar. The power mapping relationship between the busbar side and the pile head side is corrected using a voltage conversion factor. The available adjustment capacity of the system is then corrected using the module online rate. The product of these three terms serves as a global margin mapping coefficient, used to constrain the proportional adjustment limit of each pile's power.

[0086] The raw parameters to be collected are set as follows: the total number of charging piles currently in operation is assumed. The command power for each pile in one cycle is as follows:

[0087] , , , , ;

[0088] The actual output power of the corresponding rectifier power units are as follows:

[0089] , , , , ;

[0090] DC bus voltage Total bus current Busbar margin range corresponds to power Average voltage reading from each charging station port Number of online rectifier modules Configure the total number of rectifier modules For the voltage term, ratio normalization is applied; for the number of modules, proportional normalization is applied; for the power deviation term and the bus load term, the original power values ​​are retained in the calculation. The absolute value of the deviation is calculated for each term first, resulting in:

[0091] ;

[0092] ;

[0093] ;

[0094] ;

[0095] ;

[0096] Then, by performing a summation operation, we get:

[0097] ;

[0098] Calculate the busbar load-bearing capacity:

[0099] ;

[0100] Converted to kilowatts ;

[0101] Adding the power corresponding to the busbar margin range, we get:

[0102] ;

[0103] The normalized result of the voltage term is calculated to obtain:

[0104] ;

[0105] The normalized result of the number of calculation modules is obtained. ;

[0106] Substituting all the results into the formula, we get:

[0107] ;

[0108] Compared with the preset interval, the interval is divided as follows:

[0109] This is a minor deviation mapping section, which indicates that the total deviation of the pile group as a whole is in a state of slight fluctuation relative to the current bearing capacity and remaining power supply capacity of the busbar.

[0110] This is the medium deviation mapping section, which indicates that the overall deviation of the pile group has entered a fluctuating state that requires key allocation and correction.

[0111] The heavy deviation mapping section represents the concentrated occupation state of the overall deviation of the pile group within the range of the busbar margin.

[0112] This result indicates that the residual mapping coefficient fall into The corresponding light deviation mapping section, where the current pile group deviation is within the DC bus margin range, corresponds to a low occupancy mapping state. Based on this, the deviation mapping position of each charging pile is assigned to the light deviation mapping level, and this mapping level is used as the reference for determining the subsequent compensation share and reduction share allocation range.

[0113] S313: Based on the margin mapping coefficient, compare the mapping position of each charging pile with the order of the pile group's proportion distribution, determine the compensation share and reduction share belonging range, adjust the power allocation quota of each pile, and obtain the power adjustment quota data.

[0114] The margin mapping coefficient is set to ranges of 0 to 0.3, 0.3 to 0.6, and 0.6 to 1.0. The current remaining capacity percentage of 0.30 is mapped to the range of 0.3 to 0.6, with the corresponding mapping coefficient value set to 0.5. This coefficient is applied to the deviation values ​​of each pile. The deviation of pile 1 (-2.4kW) multiplied by 0.5 yields a compensation requirement of 1.2kW; the deviation of pile 2 (-3kW) multiplied by 0.5 yields a compensation requirement of 1.5kW; and the deviation of pile 3 (+5kW) multiplied by 0.5 yields a reduction requirement of 2.5kW. The piles are then mapped according to their power ranking order (pile 1, pile 2, pile 3). The first two piles are designated as the priority compensation zone, and the last pile is designated as the priority reduction zone. Pile 1 and pile 2 are assigned to the compensation zone, and pile 3 is assigned to the reduction zone. The required compensation for each pile within the compensation zone is then calculated. The values ​​are summed to obtain a total compensation demand of 2.7kW. The demand value of the reduction zone is taken as the release power of 2.5kW. The compensation demand is compared with the reduction capacity. When the compensation demand is greater than the reduction capacity, the compensation value is reduced proportionally, from 2.7kW to 2.5kW. This 2.5kW is allocated to pile 1 and pile 2 according to the original compensation ratio of 1.2 to 1.5, resulting in an adjustment of approximately 1.1kW for pile 1 and approximately 1.4kW for pile 2. At the same time, pile 3 is reduced by 2.5kW. The original power of each pile is added to and subtracted from the adjustment to obtain the new power allocation value: approximately 58.7kW for pile 1, approximately 43.4kW for pile 2, and approximately 27.5kW for pile 3. The updated power data is bound to the pile number to obtain the power adjustment quota data.

[0115] Please see Figure 5 The specific steps for obtaining the pile end current control parameters are as follows:

[0116] S411: Based on the power regulation quota data, analyze the corresponding relationship of the output range of each DC charging pile power unit, compare the position of each power quota in the range, filter the power quota that falls into the allowable range, determine the status of the power quota that exceeds the allowable range, and obtain the quota range index table.

[0117] The power allocation results obtained in the previous stage—58.7kW for pile 1, 43.4kW for pile 2, and 27.5kW for pile 3—are used as input data. Simultaneously, the allowable output range of each charging pile's power unit is used, setting the allowable range for pile 1 to 20-60kW, pile 2 to 15-50kW, and pile 3 to 10-40kW. The current power value of each pile is compared item by item with the upper and lower limits of the corresponding range. Pile 1's 58.7kW, which is less than 60kW but greater than 20kW, is included within the range; pile 2's 43.4kW, which is less than 50kW but greater than 15kW, is included within the range; and pile 3's 27.5kW, which is less than 40kW but greater than 10kW, is included within the range. At the same time, a threshold for judging the range boundaries is set. The limit is ±2kW. When the power value is less than 2kW from the upper limit or less than 2kW from the lower limit, it is marked as a boundary proximity state. Pile 1 is marked as upper boundary proximity when the power value is 1.3kW from the upper limit. All pile states are recorded as an array and filtered. Those within the range and not boundary proximity are marked as normal quota, and those boundary proximity are marked as critical quota. If there is a value exceeding the upper limit, it is marked as over-limit quota. If there is a value below the lower limit, it is marked as under-limit quota. In this example, pile 1 is marked as critical quota, and piles 2 and 3 are marked as normal quota. An index relationship table is established for each type of quota state according to the pile number. The number and state label are bound to form an index structure to obtain the quota range index table.

[0118] S412: Based on the quota interval index table, compare the corresponding current structure of each power quota under the current interface voltage, calculate the output current adjustment direction of each charging pile, filter the current setting form classification results, determine the pile end output current adaptation status, and obtain the current setting mapping group.

[0119] According to the quota range index table, the power quota and current structure matching under the interface voltage are performed. The current interface voltages of piles 1, 2, and 3 are set to 720V, 700V, and 750V respectively. The corresponding power values ​​of 58.7kW, 43.4kW, and 27.5kW are divided by the corresponding voltage to obtain the current values. Pile 1 is approximately 81.5A, pile 2 is approximately 62A, and pile 3 is approximately 36.7A. The current readback current of each pile is set to 78A, 60A, and 40A respectively. The difference between the calculated current and the readback current is calculated to obtain the difference of +3.5A for pile 1, +2A for pile 2, and -3.3A for pile 3. The difference range is divided into -5 to -1A, -1 to 1A, and 1... In the three intervals from 1 to 5A, pile 1 and pile 2 are classified into the 1 to 5A interval and marked as the current upward adjustment direction, while pile 3 is classified into the -5 to -1A interval and marked as the current downward adjustment direction. The direction judgment threshold is set to 1A. When the absolute value of the difference is less than 1A, it is marked as the maintenance state. The status of each pile is recorded as an adjustment direction array. At the same time, according to the status classification in the quota interval index table, pile 1 corresponding to the critical quota is set to fine-grained adjustment mode, and piles 2 and 3 corresponding to the normal quota are set to regular adjustment mode. The adjustment mode and current direction are combined and classified. Pile 1 is fine-grained upward adjustment, pile 2 is regular upward adjustment, and pile 3 is regular downward adjustment. The classification results are bound to the pile number to form a current setting mapping group.

[0120] S413: Based on the current setting mapping group, compare the current setting form of each pile with the power unit output range adaptation status, adjust the pile end output current setting expression form, filter the current adjustment range correspondence, determine the current control ratio belonging status, and obtain the pile end current control parameters.

[0121] Based on the current setting mapping group, the current setting method is adapted to the power unit output range. The adjustment modes of piles 1, 2, and 3 are matched with their corresponding output ranges item by item. Pile 1's current power of 58.7kW is close to the upper limit of 60kW. Combining the fine-tuning upward adjustment mode, its current setting adopts a segmented incremental method, with the adjustment step size set to 0.5A. The current 81.5A is adjusted to 82A, and the maximum is limited to no more than 83A. Pile 2's current power of 43.4kW is in the middle range. It adopts a linear adjustment method, increasing the current from 62A by 2A in the upward direction to obtain 64A. Pile 3's current power of 27.5kW is in the low-to-mid range. It adopts a decreasing method, reducing the current from 36.7A by 3A to obtain 33.7A. At the same time, it is set... The current adjustment ranges are 78 to 83A for pile 1, 55 to 70A for pile 2, and 30 to 45A for pile 3. The adjusted current values ​​are compared with their respective ranges to confirm that they are all within the range. The adjustment ratio is calculated by comparing the current change with the original current. The ratios are approximately 0.006 for pile 1, 0.032 for pile 2, and 0.082 for pile 3. The ratio ranges are divided into 0 to 0.02, 0.02 to 0.05, and above 0.05. Pile 1 is assigned to the low ratio range, pile 2 to the medium ratio range, and pile 3 to the high ratio range. The range number is combined and bound with the current setting method to form a control parameter identifier. The pile number, corresponding current value, range range, and ratio identifier are integrated and output to obtain the pile end current control parameters.

[0122] Please see Figure 6 The specific steps for obtaining the deviation change index are as follows:

[0123] S511: Based on the pile end current control parameters, analyze the correspondence with the pile end readback current, compare the deviation direction of the target current amplitude and the readback current, calculate the set current difference ratio of each scheduling cycle, screen segments with consistent deviation direction, determine the current deviation status, and obtain the current deviation trajectory.

[0124] The target currents for pile 1 (82A), pile 2 (64A), and pile 3 (33.7A) are set as the target values. Simultaneously, readback current data is collected over three consecutive scheduling cycles. For example, cycle 1: pile 1 80A, pile 2 62A, pile 3 35A; cycle 2: pile 1 81A, pile 2 63A, pile 3 34A; cycle 3: pile 1 82A, pile 2 64A, pile 3 33A. The target current and readback current for each cycle are subtracted one by one to obtain the deviation value. The deviation for cycle 1 is +2A for pile 1, +2A for pile 2, and -1.3A for pile 3; for cycle 2, +1A for pile 1, +1A for pile 2, and -0.3A for pile 3; and for cycle 3, 0A for pile 1, 0A for pile 2, and +0.7A for pile 3. The deviation values ​​are divided into directional intervals: greater than 0 is marked as positive deviation, less than 0 as negative deviation, and equal to 0 as zero deviation. The cyclic deviation direction is recorded as a sequence. For example, pile 1 is positive, positive, zero; pile 2 is positive, positive, zero; and pile 3 is negative, negative, positive. The deviation value of each cycle is calculated by the ratio of the target current to obtain the difference ratio. For example, the deviation of pile 1 in cycle 1 is 2 divided by 82, which is approximately 0.024; the deviation of pile 2 in cycle 2 is 1 divided by 82, which is approximately 0.012; and the deviation of pile 3 in cycle 3 is 0. The ratio range is divided into 0 to 0.01, 0.01 to 0.03, and above 0.03. The corresponding ratios are assigned to the middle and low ranges, respectively. Cyclic segments with the same deviation direction are filtered. Pile 1 and pile 2 have positive deviations in the first two cycles, forming a consistent segment. Pile 3 has negative deviations in the first two cycles, forming a consistent segment. The segments are marked as consistent direction segments. Cycles with changes in direction are marked as switching segments. The directional segments of each pile are combined with the difference ratio sequence to form time series trajectory data, which yields the current deviation trajectory.

[0125] S512: Based on the current deviation trajectory, compare the changes in the proportion of the difference between the previous and subsequent cycles, calculate the distribution relationship between the segments changing in the same direction and the segments changing alternately, screen the continuous segments of the change direction, determine the trend status of each segment, and obtain the deviation trend partition.

[0126] The obtained difference ratio sequence of each pile is used as input. For example, pile 1 is 0.024, 0.012, 0; pile 2 is 0.031, 0.016, 0; and pile 3 is 0.037, 0.008, 0.021. Difference calculation is performed between adjacent periods of each pile. Pile 1 yields -0.012 and -0.012, pile 2 yields -0.015 and -0.016, and pile 3 yields -0.029 and +0.013. The change values ​​are divided into negative change intervals (less than 0) and positive change intervals (greater than 0). Pile 1 and pile 2 are all classified as negative changes, and pile 3 is classified as both negative and positive changes. Segments with continuous change directions are grouped together, with pile 1 and pile 2 forming a continuous negative change segment. The segments, including pile 3, form alternating segments. The range of change is divided into 0 to 0.01, 0.01 to 0.03, and above 0.03. The change value of pile 1 is assigned to the 0.01 to 0.03 range, and that of pile 2 is assigned to the 0.01 to 0.03 range. The first segment of pile 3 is assigned to the above 0.03 range, and the second segment is assigned to the 0.01 to 0.03 range. Segments with consistent direction and stable amplitude range are selected as continuous segments, and segments with changing direction are selected as alternating segments. Each segment is labeled according to the combination of direction and amplitude, such as continuous negative medium amplitude segments and alternating segments. The segments are arranged in chronological order and numbered. The set of segment numbers corresponding to each pile is output to obtain the deviation trend partition.

[0127] S513: Based on the deviation trend partitioning, compare the deviation direction continuation status of adjacent cycles, calculate the difference ratio convergence relationship, screen the direction stable segment and the direction switching segment, determine the execution consistency attribution status, and obtain the execution deviation change index.

[0128] Based on the deviation trend zoning, the continuation status of the deviation direction in adjacent cycles is processed. The trend segment number sequence obtained in the previous stage is used as input. For example, pile 1 and pile 2 are continuous negative segments, and pile 3 is an alternating segment. The deviation direction of each pile in adjacent cycles is compared item by item. The number of times that pile 1 and pile 2 have the same direction from cycle 1 to cycle 2 and from cycle 2 to cycle 3 is 2. The ratio of the number of direction continuations to the total number of cycles is calculated to obtain the continuation ratio, which is 2 divided by 2 equals 1. The ratio range is divided into 0 to 0.5, 0.5 to 0.8, and above 0.8. Pile 1 and pile 2 are classified into the above 0.8 range, and the number of continuations for pile 3 is 0, resulting in a ratio of 0. The sequence is categorized into the 0 to 0.5 interval. Simultaneously, a convergence judgment is performed on the difference ratio sequence. Sequences with gradually decreasing absolute values ​​of differences between adjacent periods are marked as convergent sequences. Pile 1 and Pile 2 both show continuous decreases and are marked as convergent. Pile 3 shows a decrease followed by an increase and is marked as non-convergent. The convergent and non-convergent states are combined and classified with the direction of continuation ratio. High continuation and convergence are marked as stable segments, and low continuation or non-convergent segments are marked as switching segments. The segments corresponding to each pile are filtered and classified. Pile 1 and Pile 2 are classified into stable segments, and Pile 3 is classified into switching segments. The classification results are bound with the pile number and ratio data for output to obtain the execution deviation change index.

[0129] A smart scheduling system for DC charging pile groups, the system comprising:

[0130] The power supply verification module is based on the distribution transformer of the charging pile group. It analyzes the relationship between rated capacity and load current, calculates the difference between the input power of AC distribution terminal and the output power of bus, determines the distribution of power supply occupied area, and obtains the power supply margin index.

[0131] The percentage collection module analyzes the voltage and current feedback status of the vehicle charging interface based on the power supply margin index, calculates the output level of a single pile, compares the positional relationship of the output of a single pile in the total output sequence of the pile group, filters the power occupancy ratio distribution, and obtains the percentage distribution of the pile group.

[0132] Based on the distribution of pile group proportions, the quota allocation module calculates the difference between the commanded power and the output of the rectifier power unit in the previous cycle, compares the deviation direction of each pile, filters the positive and negative deviation sets, determines the distribution relationship of the deviation in the bus power supply capacity, and obtains power regulation quota data.

[0133] The current conversion module compares the allowable output range of each DC charging pile based on the power regulation quota data, filters the power quota within the range, calculates the relationship between the vehicle charging interface voltage and the power quota, adjusts the output current setting, and obtains the pile end current control parameters.

[0134] The deviation determination module analyzes the relationship between the set current and the pile end feedback current based on the pile end current control parameters, calculates the current difference ratio, compares the difference in the periodic sequence change trend, filters the direction of execution deviation change, and obtains the execution deviation change index.

[0135] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for intelligent scheduling of DC charging pile groups, characterized in that, Includes the following steps: S1: Based on the power distribution transformer of the charging pile group, analyze the relationship between rated capacity and load current, calculate the difference between AC power input power and bus output power, determine the distribution of power supply occupied area, and obtain the power supply margin index. S2: Based on the power supply margin index, analyze the voltage and current feedback status of the vehicle charging interface, calculate the output level of a single pile, compare the positional relationship of the output of a single pile in the total output sequence of the pile group, screen the power occupancy ratio distribution, and obtain the pile group proportion distribution. S3: Based on the pile group proportion distribution, calculate the difference between the commanded power and the output of the rectifier power unit in the previous cycle, compare the deviation direction of each pile, filter the positive and negative deviation sets, determine the distribution relationship of the deviation in the bus power supply capacity, and obtain the power regulation quota data. S4: Based on the power regulation quota data, compare the allowable output range of each DC charging pile, filter the power quota within the range, calculate the relationship between the vehicle charging interface voltage and the power quota, adjust the output current setting, and obtain the pile end current control parameters. S5: Based on the pile end current control parameters, analyze the relationship between the set current and the pile end feedback current, calculate the current difference ratio, compare the difference in the periodic sequence change trend, screen the direction of execution deviation change, and obtain the execution deviation change index.

2. The intelligent scheduling method for DC charging pile groups according to claim 1, characterized in that, The power supply margin indicators include remaining power supply capacity, load occupancy ratio, and power supply margin range; the pile group proportion distribution includes single pile power ratio, pile group ranking weight, and power sharing ratio; the power adjustment quota data includes deviation compensation amount, power allocation weight, and adjustment quota ratio; the pile end current control parameters include target current amplitude, current adjustment range, and current control ratio; and the execution deviation change indicators include current deviation amplitude, deviation change trend, and execution consistency degree.

3. The intelligent scheduling method for DC charging pile groups according to claim 1, characterized in that, The specific steps for obtaining the power supply margin index are as follows: S111: Based on the distribution transformer of the charging pile group, obtain the rated capacity and load current data, compare the power transfer status of the AC distribution input terminal and the DC bus output power, filter the corresponding interval of load change, determine the current load location, and obtain the load section identifier. S112: Based on the load section identifier, analyze the combination relationship with the DC bus voltage and total current, compare the bus occupancy position under the rated capacity constraint, screen the connection relationship of the power transmission occupancy section, determine the section switching status, adjust the corresponding boundary of each power transmission occupancy section, and obtain the boundary allocation section. S113: Based on the boundary allocation interval, compare the current load allocation interval with the power transfer status of the AC input terminal and DC bus, filter the segments corresponding to the remaining power supply capacity, determine the margin segment where the load occupancy ratio is located, adjust the segment merging relationship, and obtain the power supply margin index.

4. The intelligent scheduling method for DC charging pile groups according to claim 1, characterized in that, The specific steps for obtaining the distribution of the proportion of pile groups are as follows: S211: Based on the power supply margin index, compare the corresponding states of the vehicle charging interface readback voltage and readback current, calculate the current output power of each charging pile, filter the differences in output states, determine the operating category of each pile, and obtain the power status of a single pile. S212: Based on the power status of the single pile, calculate the proportion of the output power of each charging pile in the total output of the pile group, compare the order of the power proportions of each pile, filter the proportion arrangement level, determine the sequence order of each charging pile in the total output of the pile group, and obtain the power sorting position. S213: Based on the power ranking, compare the power proportion of each charging pile in the segment, filter the range of each pile in the power supply capacity of the pile group, determine the power sharing of each pile, adjust the corresponding relationship of the bearing range of each pile, and obtain the proportion distribution of the pile group.

5. The intelligent scheduling method for DC charging pile groups according to claim 1, characterized in that, The specific steps for obtaining the power regulation quota data are as follows: S311: Based on the distribution of the pile group, analyze its correspondence with the command power of the previous cycle, compare the deviation direction of the actual output of the rectifier power unit and the command power of each pile, filter the records of deviation in the same direction and the records of deviation in the opposite direction, and obtain the proportion of deviation direction. S312: Based on the aforementioned deviation direction proportion, analyze the power correlation with DC bus voltage, total bus current, and bus margin range, and calculate the mapping degree of each pile deviation within the bus margin range using the formula: ； Obtain the residual mapping coefficient ,in, This indicates the total number of charging stations currently in operation. Indicates the first The commanded power of the charging pile in the previous cycle. Indicates the first The actual output of the rectifier power unit corresponding to each charging pile. This indicates the current operating voltage value of the DC bus. This indicates the current total output current of the DC bus. This indicates the remaining power supply capacity that can be continuously allocated to the DC bus. This represents the average value of the voltage read back from each charging station port. This indicates the number of online rectifier modules, specifically the total number of rectifier modules currently in normal operation and capable of outputting power. This indicates the total number of rectifier modules configured, referring to the total number of rectifier modules configured in the charging pile group system; S313: Based on the aforementioned margin mapping coefficient, compare the mapping position of each charging pile with the order of the pile group's proportion distribution, determine the range of compensation share and reduction share, adjust the power allocation quota of each pile, and obtain power adjustment quota data.

6. The intelligent scheduling method for DC charging pile groups according to claim 1, characterized in that, The specific steps for obtaining the pile end current control parameters are as follows: S411: Based on the power regulation quota data, analyze the correspondence between the output ranges of each DC charging pile power unit, compare the position of each power quota in the range, filter the power quotas that fall into the allowable range, determine the status of the power quotas that exceed the allowable range, and obtain the quota range index table. S412: Based on the quota interval index table, compare the corresponding current structure of each power quota under the current interface voltage, calculate the output current adjustment direction of each charging pile, filter the current setting form classification results, determine the pile end output current adaptation status, and obtain the current setting mapping group. S413: Based on the current setting mapping group, compare the current setting form of each pile with the power unit output range adaptation status, adjust the pile end output current setting form, filter the current adjustment range correspondence, determine the current control ratio belonging status, and obtain the pile end current control parameters.

7. The intelligent scheduling method for DC charging pile groups according to claim 1, characterized in that, The specific steps for obtaining the execution deviation change index are as follows: S511: Based on the pile end current control parameters, analyze the correspondence with the pile end readback current, compare the deviation direction of the target current amplitude and the readback current, calculate the set current difference ratio of each scheduling cycle, filter segments with consistent deviation direction, determine the current deviation status, and obtain the current deviation trajectory. S512: Based on the current deviation trajectory, compare the changes in the ratio of the difference between the previous and subsequent cycles, calculate the distribution relationship between the segments changing in the same direction and the segments changing alternately, screen the continuous segments of the change direction, determine the trend status of each segment, and obtain the deviation trend partition. S513: Based on the deviation trend partition, compare the deviation direction continuation status of adjacent cycles, calculate the difference ratio convergence relationship, screen the direction stable segment and the direction switching segment, determine the execution consistency attribution status, and obtain the execution deviation change index.

8. The intelligent scheduling method for DC charging pile groups according to claim 1, characterized in that, The load current refers to the actual current flowing through the output side of the distribution transformer, representing the current load level. The input power refers to the electrical power transmitted from the AC power distribution input terminal to the charging station. The output power of the bus refers to the total output power distributed by the DC bus to each charging pile.

9. A smart scheduling system for DC charging pile groups, characterized in that, The system is used to implement the intelligent scheduling method for DC charging pile groups according to any one of claims 1-8, and the system includes: The power supply verification module is based on the distribution transformer of the charging pile group. It analyzes the relationship between rated capacity and on-load current, calculates the difference between the input power of AC distribution terminal and the output power of bus, determines the distribution of power supply occupied area, and obtains the power supply margin index. Based on the power supply margin index, the proportion collection module analyzes the voltage and current feedback status of the vehicle charging interface, calculates the output level of a single pile, compares the positional relationship of the output of a single pile in the total output sequence of the pile group, filters the power occupancy ratio distribution, and obtains the proportion distribution of the pile group. Based on the distribution of the pile group, the quota allocation module calculates the difference between the commanded power and the output of the rectifier power unit in the previous cycle, compares the deviation direction of each pile, filters the positive and negative deviation sets, determines the distribution relationship of the deviation in the power supply capacity of the bus, and obtains the power regulation quota data. Based on the power regulation quota data, the current conversion module compares the allowable output range of each DC charging pile, filters the power quota within the range, calculates the relationship between the vehicle charging interface voltage and the power quota, adjusts the output current setting, and obtains the pile end current control parameters. Based on the pile end current control parameters, the deviation determination module analyzes the relationship between the set current and the pile end feedback current, calculates the current difference ratio, compares the difference in the periodic sequence change trend, filters the direction of execution deviation change, and obtains the execution deviation change index.

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