Charging power allocation method for multi-gun charging pile of electric vehicle

Abstract

The invention discloses an electric vehicle multi-gun charging pile charging power allocation method, and relates to the technical field of electric vehicle charging power allocation, and the method comprises the steps: calculating the actual charging electric quantity increment and the actual accumulated charging electric quantity according to the actual output voltage and the actual output current of each charging gun; calculating a progress deviation index based on the maximum direct current charging power curve allowed to be received, the target departure time and a maximum charging power sequence allowed to be received determined from the current moment to the target departure time of the target charging progress curve; based on the progress deviation indexes and the available total power, determining initial target charging power according to the proportion of each progress deviation index to the total progress deviation index, and limiting the target charging power according to a maximum direct current charging power curve allowed to be received; and controlling the output voltage and the output current of each charging gun through the target charging power, collecting the actual output voltage and the actual output current of each charging gun, and updating the actual accumulated charging electric quantity. And the power utilization level is improved.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle charging power allocation technology, and in particular to a method for allocating charging power for multi-gun charging piles for electric vehicles. Background Technology

[0002] With the increasing number of electric vehicles and the densification of urban fast charging networks, DC fast charging stations are playing an increasingly prominent role in the transportation energy replenishment system. Multi-gun charging piles, through sharing power modules and DC buses, can serve multiple vehicles in parallel on the same equipment. In conjunction with the power distribution management and time-sharing strategy on the station side, unified scheduling of the total available power can be achieved. Existing technologies typically rely on the command interaction between the charging controller and the station management, as well as DC charging communication with the on-board battery management device, to obtain information such as the vehicle's power status, user-set targets, and the vehicle's allowable power receiving capacity. Power commands are generated within a fixed control cycle, and the target power is achieved by adjusting the output voltage and output current. At the same time, related implementations generally follow charging communication and interoperability standards, and are combined with insulation monitoring, overcurrent and overvoltage protection, and temperature rise management measures to ensure the operational safety and reliability of multi-gun concurrent operation. The charging pile continuously collects and measures the actual output voltage and current for billing settlement, operation monitoring, and closed-loop control updates, thereby improving the concurrent charging efficiency and equipment utilization rate under safety constraints.

[0003] Conventional power allocation is mostly based on equal distribution or static priority. If the power allocation lacks a unified characterization of the charging progress over time, different vehicles may deviate from the expected trajectory during the charging process, making it difficult to stabilize and return to the expected trajectory in subsequent cycles. This will affect the matching of departure time and target charge level. Due to the dynamic upper limit of the allowable power curve, simple power limit truncation often results in unused residual power. If there is no redistribution mechanism for unsaturated objects, it is easy to cause insufficient utilization of the total available power and reduce the overall efficiency of concurrent charging. Summary of the Invention

[0004] In view of the aforementioned existing problems, the present invention is proposed.

[0005] Therefore, the present invention provides a method for allocating charging power for multi-gun charging piles for electric vehicles to solve the problem that the charging progress is difficult to coordinate with the departure time and easily leads to idle residual power under the condition of multiple guns operating concurrently and total power being limited.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: This invention provides a method for adjusting the charging power of multi-gun charging piles for electric vehicles, comprising, Collect curves of available total power, battery status, target battery status, target departure time, and maximum allowable DC charging power, and generate a target charging progress curve based on battery status, target battery status, and target departure time; The actual charging power increment and actual cumulative charging power are calculated based on the actual output voltage and actual output current of each charging gun. The progress deviation index is calculated based on the maximum allowable DC charging power curve, the target departure time, and the maximum allowable charging power sequence determined from the current time to the target departure time of the target charging progress curve. Based on the schedule deviation index and the total available power, the initial target charging power is determined according to the proportion of each schedule deviation index to the total schedule deviation index, and the target charging power is limited according to the maximum allowable DC charging power curve. The output voltage and current of each charging gun are controlled by the target charging power, and the actual output voltage and current of each charging gun are collected and the actual cumulative charging capacity is updated.

[0007] As a preferred embodiment of the electric vehicle multi-gun charging pile charging power allocation method of the present invention, the specific steps for collecting the available total power, battery status, target battery status, target departure time, and the maximum allowable DC charging power curve are as follows: When an electric vehicle connects to any of the charging guns of a multi-gun charging station, a new allocation process is initiated. Within the current control cycle, a data request is sent to the station management and the available total power instruction is received and parsed. The available total power is used as the upper limit of the total power allocation for charging power. The system reads the battery status, target battery status, and target departure time through DC charging communication with the vehicle battery management device, and records the access time and target departure time. The maximum allowable DC charging power curve is read from the vehicle battery management device, and linear interpolation is performed between discrete points on the curve according to the battery status to determine the maximum allowable DC charging power.

[0008] As a preferred embodiment of the electric vehicle multi-gun charging pile charging power allocation method of the present invention, the step of generating a target charging progress curve based on the battery status, target battery status, and target departure time includes: Starting from the moment the electric vehicle enters the circuit and ending at the moment the target leaves the circuit, the charging time interval is divided into continuous control cycles and equal-interval control moments are formed. Based on the difference between the current battery status and the target battery status, the total amount of electricity to be replenished is determined by the battery capacity and battery status mapping table. The total amount of electricity to be replenished is then mapped to each control cycle according to the total time length and accumulated sequentially to generate the target charging progress curve.

[0009] As a preferred embodiment of the electric vehicle multi-gun charging pile charging power allocation method of the present invention, the specific steps for calculating the actual charging power increment and the actual cumulative charging power based on the actual output voltage and actual output current of each charging gun are as follows: At the start of the next control cycle, for each charging gun in the connected state, read the representative actual output voltage and representative actual output current recorded in the previous control cycle, determine the representative output power of the previous control cycle, and calculate the actual charging power increment of the previous control cycle with the control cycle duration. The actual cumulative charging power is updated by adding the actual charging power increment to obtain the actual cumulative charging power at the current moment.

[0010] As a preferred embodiment of the electric vehicle multi-gun charging pile charging power allocation method of the present invention, the maximum receivable charging power sequence determined based on the maximum allowable DC charging power curve, the target departure time, and the target charging progress curve from the current time to the target departure time includes: Based on the target departure time, determine each control time from the current time to the target departure time, and obtain the target cumulative charging power at each control time according to the target charging progress curve. Convert and associate the target cumulative charging power with the power contained in the battery at the moment of access. Use the battery capacity and power status correspondence table to reverse locate the power status at each control time. The maximum DC charging power allowed to be received at each control moment is obtained by interpolating the power status at each control moment onto the maximum DC charging power curve. The maximum charging power allowed to be received is formed in time sequence, and the maximum charging power allowed to be received sequence is converted into rechargeable power according to the control cycle duration. The maximum rechargeable power is obtained by accumulating the sequence in sequence.

[0011] As a preferred embodiment of the electric vehicle multi-gun charging pile charging power allocation method of the present invention, the specific steps for calculating the progress deviation index are as follows: Once the target cumulative charging capacity, the actual cumulative charging capacity, and the maximum rechargeable capacity allowed to be received from the current moment until the target leaves are all determined, the difference between the target cumulative charging capacity and the actual cumulative charging capacity is calculated as the schedule gap. The maximum rechargeable amount of electricity that can be received from the current moment to the target departure time and the sum of the positive rechargeable amount of electricity shift are used as the normalization benchmark, and the ratio of the schedule gap to the normalization benchmark is used as the schedule deviation index.

[0012] As a preferred embodiment of the electric vehicle multi-gun charging pile charging power allocation method of the present invention, the step of determining the initial target charging power according to the proportion of each progress deviation index to the total progress deviation index includes: Within the current control cycle, read the available total power and the progress deviation index of each charging gun, and sum all the progress deviation indices to obtain the total progress deviation index. When the total schedule deviation index is zero, the target charging power of each charging gun is set to zero and written into the power command table. When the total schedule deviation index is positive, the available total power is allocated to each charging gun according to the ratio of the single charging gun schedule deviation index to the total schedule deviation index, so as to obtain the initial target charging power of each charging gun and write it into the power command table.

[0013] As a preferred embodiment of the electric vehicle multi-gun charging pile charging power allocation method of the present invention, the specific steps of limiting the target charging power according to the maximum allowable DC charging power curve are as follows: For each charging gun, the current power status is calculated by converting the actual cumulative charging power at the current moment according to the battery capacity and power status correspondence table. The current power status is linearly interpolated in the maximum DC charging power curve that can be received at the current moment to obtain the maximum DC charging power that can be received at the current moment. The target charging power is compared with the maximum DC charging power that can be received at the current moment and the value that does not exceed the maximum DC charging power that can be received at the current moment is taken as the target charging power after limitation. If unallocated total available power is generated due to restrictions, the remaining total available power will be redistributed according to the progress deviation index percentage only among the charging guns that have not yet reached their respective maximum DC charging power after the restrictions are applied, and the restrictions will be repeated until the total available power is fully allocated.

[0014] As a preferred embodiment of the electric vehicle multi-gun charging pile charging power allocation method of the present invention, the specific steps of controlling the output voltage and output current of each charging gun by the target charging power are as follows: At the start of the control cycle, the target charging power of each connected charging gun in the power instruction table is read, and an execution instruction is issued to the charging gun. At the same time, the actual output voltage of the charging gun at the start of the control cycle is read as the power conversion reference. The output current instruction is generated based on the target charging power and the power conversion reference. If the actual output voltage at the start of the control cycle still fluctuates, the actual output voltage recorded at the end of the previous control cycle is used as the power conversion reference.

[0015] As a preferred embodiment of the electric vehicle multi-gun charging pile charging power allocation method of the present invention, the specific steps of collecting the actual output voltage and actual output current of each charging gun and updating the actual cumulative charging capacity are as follows: During the execution of the current control cycle, the actual output voltage and actual output current of each charging gun are collected. Before the end of the control cycle, the representative actual output voltage and representative actual output current are calculated respectively. The representative output power is determined by the representative actual output voltage and representative actual output current. The actual charging power increment of the current control cycle is obtained by converting it with the control cycle duration. The actual charging power increment is added to the actual cumulative charging power already saved by the charging gun to obtain the updated actual cumulative charging power.

[0016] The beneficial effects of this invention are as follows: by generating a target charging progress curve and combining it with the actual cumulative charging power to form a traceable progress benchmark, the consistency between the charging process and the target departure time and the target power status is constrained and verified, thereby reducing the matching distortion caused by the cumulative progress deviation in concurrent charging. By being constrained by the maximum DC charging power curve that can be received and redistributing the remaining power after the limitation, the power allocation always matches the vehicle's power receiving capacity and avoids the total available power being cut off and idle, ultimately improving the power utilization level and charging progress attainability under multi-gun concurrent conditions. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A flowchart of the charging power allocation method for multi-gun charging piles for electric vehicles.

[0019] Figure 2 A flowchart for generating the target charging progress curve.

[0020] Figure 3 This is a flowchart for calculating the schedule deviation index.

[0021] Figure 4 A flowchart for power limiting and redistribution. Detailed Implementation

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0025] Reference Figures 1-4 This is one embodiment of the present invention, which provides a method for adjusting the charging power of a multi-gun charging pile for electric vehicles, including the following steps: S1. Collect the curves of available total power, power status, target power status, target departure time, and maximum allowable DC charging power. Generate the target charging progress curve based on the power status, target power status, and target departure time.

[0026] When an electric vehicle connects to any of the charging guns of a multi-gun charging station, a new allocation process is initiated. Within the current control cycle, a data request message is sent to the station management, and the available total power instruction allocated to the multi-gun charging station for the current time period is received and parsed from the station management. The available total power is then saved as the upper limit of the total power allocation for charging power.

[0027] Through DC charging communication with the on-board battery management device, the electric vehicle's battery status and target battery status are read. The battery status is the percentage of battery power or equivalent battery power reported by the on-board battery management device at the moment of connection, and the target battery status is the target percentage of battery power or equivalent battery power set by the user in the charging interface.

[0028] The target departure time associated with this charging is read from the on-board battery management device. The target departure time is the time when the user expects to complete this charging and leave the multi-gun charging station. The target departure time is recorded together with the actual time when the electric vehicle is connected to the charging station.

[0029] The maximum allowable DC charging power curve is read from the vehicle battery management device. The maximum allowable DC charging power curve is composed of discrete points corresponding to different charge states, with the charge state as the horizontal axis and the maximum allowable DC charging power as the vertical axis. The maximum allowable DC charging power of each discrete point is obtained according to the charge state. When the charge state is between adjacent discrete points, the maximum allowable DC charging power corresponding to the charge state is calculated by linear interpolation of the maximum allowable DC charging power of adjacent discrete points. The maximum allowable DC charging power curve is then associated and stored with the charge state and the target charge state.

[0030] Starting from the moment the electric vehicle enters the circuit and ending at the moment the target leaves the circuit, the entire charging time interval is divided into continuous control cycles, forming equally spaced control moments on the time axis. At each control moment, a corresponding target cumulative charging amount is generated for the electric vehicle.

[0031] Based on the difference between the current battery status and the target battery status, the battery capacity and battery status relationship matching the current vehicle identifier is read from the battery capacity and battery status correspondence table written into the charging controller memory during the installation and commissioning phase. The total amount of electricity to be replenished for this charge is determined. Then, based on the total time length between the access time and the target departure time, the target amount of electricity completed in each control cycle is calculated. The target amount of electricity in each control cycle is sequentially accumulated over time, so that the target cumulative charging amount corresponding to the access time is zero, and the target cumulative charging amount corresponding to the departure time is equal to the total amount of electricity to be replenished for this charge. A target charging progress curve that smoothly rises from zero to the target replenishment amount is obtained on the time axis.

[0032] The battery capacity and state of charge mapping table is a pre-stored mapping table used to represent the battery capacity of an electric vehicle at different states of charge. The charging controller uses the mapping table to convert between the state of charge and the charging capacity.

[0033] When generating the target charging progress curve, the target cumulative charging amount corresponding to each control moment is associated with and stored with the electric vehicle's power status, target power status, target departure time, and the maximum DC charging power curve that can be received. The target charging progress curve of the electric vehicle is updated and solidified before the end of the current control cycle.

[0034] S2. Calculate the actual charging power increment and actual cumulative charging power based on the actual output voltage and actual output current of each charging gun, and calculate the progress deviation index based on the maximum allowable DC charging power curve, the target departure time, and the maximum allowable charging power sequence determined from the current time to the target departure time of the target charging progress curve.

[0035] At the start of the next control cycle, for each charging gun in the connected state, the representative actual output voltage and representative actual output current recorded in the previous control cycle are read. The product of the representative actual output voltage and the representative actual output current is used as the representative output power of the previous control cycle. The product of the representative output power and the control cycle duration is used as the actual charging capacity increment of the previous control cycle. The actual charging capacity increment is added to the actual cumulative charging capacity of the charging gun to obtain the actual cumulative charging capacity at the current moment. The actual cumulative charging capacity is then associated and stored with the target cumulative charging capacity corresponding to the start time of the current control cycle on the target charging progress curve.

[0036] Based on the target departure time, a set of control times from the current time to the target departure time is determined. Within this set, a sequence of maximum allowable charging power is constructed time-by-time. For each control time, the target cumulative charging capacity is read from the target charging progress curve. Then, the battery capacity corresponding to the instantaneous charging state is looked up from the battery capacity-to-charge state correspondence table. The sum of the target cumulative charging capacity and the battery capacity at each control time is taken as the target battery capacity at that control time. The target battery capacity is then used to reverse-locate the battery capacity in the battery capacity-to-charge state correspondence table and linearly interpolated to obtain the charge state at the control time. Using the horizontal axis as the horizontal axis, linear interpolation is performed between adjacent discrete points on the maximum allowable DC charging power curve to obtain the maximum allowable DC charging power at each control moment. The maximum allowable DC charging power obtained at each control moment is arranged in chronological order to form a sequence of the maximum allowable charging power from the current moment to the time of target departure. For each control cycle, the product of the maximum allowable DC charging power corresponding to the control cycle and the duration of the control cycle is taken as the rechargeable amount of the control cycle. The maximum rechargeable amount is obtained by accumulating the items in chronological order of the control cycle, which is used to characterize the amount of electricity that can still be replenished in the remaining time without violating the constraint of the maximum allowable DC charging power curve.

[0037] Once the target cumulative charging capacity, the actual cumulative charging capacity, and the maximum rechargeable capacity allowed to be received from the current moment until the target leaves are all determined, the schedule deviation index is calculated as follows: ; in, Indicates at time No. Dimensionless schedule deviation index for electric vehicles. Indicates time The target cumulative charging capacity corresponding to the target charging progress curve. Indicates time The actual cumulative charging capacity is calculated by adding the actual output voltage and actual output current increments within each control cycle over time. Indicates time The maximum rechargeable capacity is calculated and accumulated cycle by cycle from the maximum allowable receiving charging power sequence within the time until the target leaves. Indicates the relationship with the first The positive charge transfer amount associated with each electric vehicle is used to prevent the schedule deviation exponent from being abnormally amplified due to an excessively small denominator. Indicates the serial number of the electric vehicle. This indicates the start time of the current control cycle.

[0038] S3. Based on the schedule deviation index and the total available power, determine the initial target charging power according to the proportion of each schedule deviation index to the total schedule deviation index, and limit the target charging power according to the maximum allowable DC charging power curve.

[0039] The system reads the available total power issued and saved by the site management as the upper limit of the total power allocation for multi-gun charging power in the current control cycle. At the same time, it reads the progress deviation index corresponding to all charging guns in the connected state in the current control cycle, and sums all progress deviation indices to obtain the total progress deviation index. If the total progress deviation index is zero, the target charging power of each charging gun in the current control cycle is set to zero, and the target charging power is written into the power command table of the current control cycle. If the total progress deviation index is positive, the initial target charging power is calculated again.

[0040] The power command table refers to a set of data structures inside the charging controller used to issue control commands in the current control cycle.

[0041] The initial target charging power of each charging gun is calculated based on the proportion of the schedule deviation index to the total schedule deviation index. The maximum DC charging power that can be received at the current moment is determined for each charging gun. The battery charge corresponding to the charge state at the moment of connection is found from the battery capacity and charge state correspondence table. The sum of the actual cumulative charging charge at the current moment and the battery charge is taken as the battery charge at the current moment. The battery charge at the current moment is used to reverse the location in the battery capacity and charge state correspondence table and linear interpolation is performed to obtain the charge state at the current moment. The charge state at the current moment is used as the horizontal axis and linear interpolation is performed between adjacent discrete points of the maximum DC charging power curve that can be received to obtain the maximum DC charging power that the charging gun can receive at the current moment.

[0042] The initial target charging power is compared with the maximum DC charging power allowed to be received at the current moment. If the initial target charging power is greater than the maximum DC charging power allowed to be received at the current moment, the target charging power of the charging gun is limited to the maximum DC charging power allowed to be received at the current moment. After all charging guns are limited, if there is still unallocated total available power, then only among the charging guns whose target charging power after limitation is still less than their respective maximum DC charging power allowed to be received at the current moment, the remaining total available power is redistributed according to the ratio of the progress deviation index of the charging guns that have not reached their respective maximum DC charging power allowed to be received at the current moment to the sum of the progress deviation indices of the charging guns that have not reached their respective maximum DC charging power allowed to be received at the current moment. The limitation is then applied again, and this redistribution and limitation is repeated until the total available power is fully allocated or the target charging power of all charging guns reaches their respective maximum DC charging power allowed to be received at the current moment. The expression is: ; in, Indicates time Assigned to the The target charging power of the charging gun for each electric vehicle. Indicates the time when the data is received and saved from the site management. The total available power allocated to multi-gun charging stations. Indicates time The maximum DC charging power that an electric vehicle can receive, determined by linear interpolation of the maximum allowable DC charging power curve under the given charge state. This indicates the summation sequence number used when summing the progress deviation indices corresponding to the charging guns involved in the allocation. Indicates time The number of charging guns that are connected and participating in the coordination.

[0043] S4. Control the output voltage and output current of each charging gun through the target charging power, collect the actual output voltage and actual output current of each charging gun and update the actual cumulative charging power.

[0044] At the start of the control cycle, the target charging power corresponding to each connected charging gun in the power command table is read, and an execution command is issued to the corresponding charging gun to adjust the output of the charging gun according to the target charging power within the current control cycle. At the same time as issuing the target charging power, the actual output voltage of the charging gun at the start of the control cycle is read as the power conversion benchmark for the current control cycle, and an output current command is generated based on the target charging power and the power conversion benchmark. If the actual output voltage still fluctuates at the start of the control cycle, the actual output voltage recorded at the end of the previous control cycle is used as the power conversion benchmark to ensure that the output current command can be generated in time and drive the charging gun to enter the power following state. After receiving the target charging power and output current command, the charging gun adjusts the output voltage and output current to make the actual output power approach the target charging power, and maintains the following relationship within the current control cycle until the end of the control cycle.

[0045] During the execution of the current control cycle, the charging controller collects the actual output voltage and actual output current of each charging gun at a fixed sampling interval. Before the end of the control cycle, it calculates representative values ​​for the actual output voltage and actual output current sampled in the current control cycle. The representative actual output voltage and representative actual output current of the current control cycle are used to determine the representative output power in the current control cycle. The representative output power is converted with the control cycle duration to obtain the actual charging power increment of the current control cycle. The actual charging power increment is added to the actual cumulative charging power already saved by the charging gun to obtain the actual cumulative charging power at the end of the current control cycle. The updated actual cumulative charging power is associated with the charging gun and stored. The representative actual output voltage and representative actual output current of this control cycle are also recorded together, so that the updated actual cumulative charging power can be directly reused to calculate the progress deviation index and allocate the target charging power at the beginning of the next control cycle.

[0046] In summary, this invention achieves consistency constraints and verification between the charging process and the target departure time and target charge status by generating a target charging progress curve and combining it with the actual cumulative charging amount to form a traceable progress benchmark. This reduces the matching distortion caused by the cumulative progress deviation in concurrent charging. By constraining the maximum allowable DC charging power curve and redistributing the remaining power after the constraint, the power allocation always matches the vehicle's power receiving capacity and avoids the total available power being cut off and idle. Ultimately, this improves the power utilization level and charging progress attainability under multi-gun concurrent conditions.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for charging power allocation of an electric vehicle multi-gun charging pile, characterized in that: The method comprises the following steps: According to the state of charge, the target state of charge and the target departure time, a target charging progress curve is generated; The actual charging power increment and the actual cumulative charging power are calculated according to the actual output voltage and the actual output current of each charging gun, and the maximum charging power sequence allowed to be received is determined based on the maximum direct-current charging power curve allowed to be received, the target departure time and the target charging progress curve within the current time to the target departure time, and the progress deviation index is calculated; Based on the progress deviation index and the total available power, the initial target charging power is determined according to the proportion of each progress deviation index in the total progress deviation index, and the target charging power is limited according to the maximum direct-current charging power curve allowed to be received; The output voltage and the output current of each charging gun are controlled by the target charging power, and the actual output voltage and the actual output current of each charging gun are collected and the actual cumulative charging power is updated.

2. The electric vehicle multi-gun charging pile charging power allocation method of claim 1, wherein: The available total power, the state of charge, the target state of charge, the target departure time and the maximum direct-current charging power curve allowed to be received are collected, and the specific steps are as follows: When the electric vehicle accesses any charging gun of the multi-gun charging pile, a new deployment process is started, and the data request is sent to the station management and the available total power is received as the upper limit of the total power for charging power deployment within the current control period; The state of charge, the target state of charge and the target departure time are read through the direct-current charging communication with the on-board battery management device, and the access time and the target departure time are recorded; The maximum direct-current charging power curve allowed to be received is read from the on-board battery management device, and the linear interpolation is performed between the discrete points of the curve according to the state of charge to determine the maximum direct-current charging power allowed to be received.

3. The electric vehicle multi-gun charging pile charging power allocation method of claim 2, wherein: The target charging progress curve is generated according to the state of charge, the target state of charge and the target departure time, which comprises: The charging time interval is divided into continuous control periods and equal interval control time points with the access time of the electric vehicle as the starting point and the target departure time as the ending point; Based on the difference between the state of charge and the target state of charge, the total amount of electricity to be supplemented this time is determined through the battery capacity and the state of charge corresponding table, and the total amount of electricity to be supplemented is mapped to each control period and sequentially accumulated according to the total time length to generate the target charging progress curve.

4. The electric vehicle multi-gun charging pile charging power allocation method of claim 3, wherein: The actual charging power increment and the actual cumulative charging power are calculated according to the actual output voltage and the actual output current of each charging gun, and the specific steps are as follows: At the beginning of the next control period, for each charging gun in the connected state, the actual output voltage and the actual output current recorded in the last control period are read to determine the representative output power of the last control period, and the actual charging power increment of the last control period is calculated by the control period length; The actual cumulative charging power of the charging gun is updated by accumulating the actual charging power increment to obtain the actual cumulative charging power at the current time.

5. The electric vehicle multi-gun charging pile charging power allocation method of claim 4, wherein: The maximum charging power sequence allowed to be received is determined based on the maximum direct-current charging power curve allowed to be received, the target departure time and the target charging progress curve within the current time to the target departure time, which comprises: determining control time instants from the current time instant to the target leaving time based on the target leaving time, and obtaining target cumulative charging electric quantity at each control time instant according to the target charging progress curve, correlating the target cumulative charging electric quantity with the electric quantity contained in the battery in the access instant electric quantity state, and inversely positioning the electric quantity state at each control time instant through the battery capacity and electric quantity state corresponding table; interpolating the electric quantity state at each control time instant on the maximum DC charging power curve allowed to be received to obtain the maximum DC charging power allowed to be received at each control time instant, forming a maximum charging power sequence allowed to be received in time sequence, and converting the maximum charging power sequence allowed to be received into chargeable electric quantity according to the control period length, and sequentially accumulating to obtain the maximum chargeable electric quantity.

6. The electric vehicle multi-gun charging pile charging power allocation method of claim 5, wherein: The specific steps of calculating the progress deviation index are, After the target cumulative charging electric quantity, the actual cumulative charging electric quantity and the maximum chargeable electric quantity allowed to be received from the current time instant to the target leaving time are determined, the difference between the target cumulative charging electric quantity and the actual cumulative charging electric quantity is calculated as the progress gap; The progress gap and the ratio of the progress gap to the normalized reference are taken as the progress deviation index.

7. The electric vehicle multi-gun charging pile charging power allocation method of claim 6, wherein: The specific steps of determining the initial target charging power according to the proportion of each progress deviation index in the total progress deviation index include, The total available power and the progress deviation index of each charging gun are read in the current control period, and the total progress deviation index is obtained by summing all the progress deviation indexes; When the total progress deviation index is zero, the target charging power of each charging gun is set to zero and written into the power instruction table, and when the total progress deviation index is positive, the total available power is allocated to each charging gun according to the proportion of the single charging gun progress deviation index in the total progress deviation index, to obtain the initial target charging power of each charging gun and write it into the power instruction table.

8. The electric vehicle multi-gun charging pile charging power allocation method of claim 7, wherein: The specific steps of limiting the target charging power according to the maximum DC charging power curve allowed to be received are, For each charging gun, the actual cumulative charging electric quantity at the current time instant is converted to obtain the electric quantity state at the current time instant according to the battery capacity and electric quantity state corresponding table, the maximum DC charging power allowed to be received at the current time instant is obtained by linear interpolation in the maximum DC charging power curve allowed to be received with the electric quantity state at the current time instant as the horizontal axis, the target charging power is compared with the maximum DC charging power allowed to be received at the current time instant, and the value not exceeding the maximum DC charging power allowed to be received at the current time instant is taken as the limited target charging power; If there is unallocated total available power due to limitation, the remaining total available power is allocated again according to the proportion of the progress deviation index only between the charging guns that have not reached their maximum DC charging power after limitation, and the limitation is repeated until the total available power is allocated.

9. The electric vehicle multi-gun charging pile charging power allocation method of claim 8, wherein: The specific steps of controlling the output voltage and output current of each charging gun through the target charging power are, The target charging power of each connected charging gun in the power instruction table is read at the beginning of the control cycle, and an execution instruction is issued to the charging gun, while the actual output voltage of the charging gun at the beginning of the control cycle is read as a power conversion reference, an output current instruction is generated according to the target charging power and the power conversion reference, and if the actual output voltage at the beginning still fluctuates, the actual output voltage recorded at the end of the last control cycle is used as the power conversion reference.

10. The electric vehicle multi-gun charging pile charging power allocation method of claim 9, wherein: The actual output voltage and actual output current of each charging gun are collected and the actual cumulative charging power is updated, and the specific steps are as follows, The actual output voltage and actual output current of each charging gun are collected during the execution of the current control cycle, and the representative actual output voltage and the representative actual output current are calculated before the end of the control cycle. The representative output power is determined by the representative actual output voltage and the representative actual output current, and the actual charging power increment of the current control cycle is converted by the control cycle length. The actual charging power increment is added to the actual cumulative charging power saved by the charging gun to obtain the updated actual cumulative charging power.

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