Charging pile charging power control and sorting method and system

Abstract

The method comprises the following steps: in response to regulation and control demand signals of an upper-stage transformer and a current-stage transformer, calculating regulation and control demands according to real-time active loads and capacities of the transformers and a preset power factor, and determining a final regulation and control demand quantity; the total adjustable load amount of the charging piles is calculated, the regulation and control execution amount is determined based on the regulation and control demand amount and the total adjustable load amount, and the charging piles comprise direct-current charging piles and alternating-current charging piles; and controlling the output power in charging according to the execution regulation and control quantity. According to the invention, the utilization rate of the charging facility and the charging service quality are improved, the operation cost of the charging station is reduced, the economic benefit and the operation efficiency of the charging operation control system are improved, the system load is relieved in the peak period, and the system stability is greatly improved; according to the load condition adjustment of the current-stage transformer and the previous-stage transformer, the power adjustment coverage is wider, the monitoring data sampling time is shortened, the adjustment is quicker, and the response is quicker.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging management and power system load control, and in particular to a charging pile charging power control and sequencing method and system. Background Art

[0002] As the penetration rate of new energy in the power grid continues to increase, the uncertainty and volatility of its output bring new challenges to the grid dispatching; on the other hand, the large-scale and disordered charging and discharging behavior of electric vehicles will cause power flow fluctuations in the power grid and even generate harmonic pollution, which also brings risks to the safe and stable operation of the power grid; electric vehicles, as a clean and environmentally friendly means of transportation, have become the development direction of the transportation field. Compared with traditional industrial and commercial loads, electric vehicles have flexible electricity consumption time, guideable electricity consumption behavior, predictable electricity consumption patterns, and intelligent electricity consumption methods. They have greater flexibility and active regulation capabilities, and can achieve non-sensing regulation for second-level response. In addition, charging facilities all use power electronic switches, which have obvious response speed advantages over traditional generator sets using mechanical switches.

[0003] Existing electric vehicle charging technology usually requires dedicated transformers for charging facilities during the construction of charging facilities, which not only increases the cost of construction and maintenance, but also brings additional complexity; secondly, in the existing charging power control, once the charging power control strategy is started, even if the distribution transformer power supply load has been reduced, the strategy cannot be exited immediately, resulting in a long control time, which in turn affects the user's charging experience. In addition, the amplitude of power control is often too large, which may have an adverse effect on the battery life of the charging vehicle. Since the collection time interval of transformer load information is long, it may happen that the charging power control is not implemented until the transformer is overloaded for too long, which makes the response time slow. Finally, these control strategies usually only focus on the load overload of the transformer at this level, and fail to fully consider the load control requirements of the entire distribution network system, thereby limiting their scalability and applicability. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above existing problems, the present invention is proposed.

[0006] Therefore, the present invention provides a charging pile charging power control and sorting method and system to solve the problems mentioned in the background technology.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] In a first aspect, an embodiment of the present invention provides a charging pile charging power control and sorting method, comprising: responding to the control demand signal of the upper transformer and the current transformer, calculating the control demand according to the real-time active load, capacity and preset power factor of the transformer, and determining the final control demand;

[0009] Calculating the total amount of adjustable load of the charging pile, and determining the execution control amount based on the control demand and the total amount of adjustable load, wherein the charging pile includes a DC charging pile and an AC charging pile;

[0010] The output power during charging is controlled according to the execution control amount.

[0011] As a preferred solution of the charging pile charging power control and sorting method described in the present invention, it also includes: when the charging platform controls the output power during charging according to the execution control amount, if there are multiple charging piles with charging loads, control is performed according to the control priority of the charging piles;

[0012] Set the control strategy of DC charging piles to the first priority, and the control strategy of AC charging piles to the second priority. The DC charging pile regulation priority is higher than the AC charging pile;

[0013] The priority charging piles are sorted according to the SOC values ​​of the vehicles being charged, with the charging piles with high SOC values ​​being given priority. If there are multiple charging guns on one pile and they are charging at the same time, the pile control is sorted according to the minimum SOC value of all vehicles being charged by the pile.

[0014] When the regulation demand of a charging pile is met, the charging load is stopped, and when the minimum value of the regulation demand and the total adjustable load is equal to 0, the regulation process ends.

[0015] As a preferred solution of the charging power control and sorting method of the charging piles described in the present invention, the priority-regulated charging piles of each level are sorted according to the SOC value of the charging vehicle, and the priority control of the charging piles with high SOC values ​​includes:

[0016] When controlling the DC charging piles, the DC charging piles are arranged in descending order according to the SOC value of the charging vehicle, the real-time charging load of each DC charging pile is adjusted down by t, and the absolute value of the updated real-time charging load (1-t) is used as the new DC charging pile charging load limit; where t is the adjustable range of the DC charging pile, expressed as a percentage;

[0017] When controlling an AC charging pile, the regulation amount of each AC charging pile is the original charging load minus the minimum charging load of the AC charging pile, and the absolute value of the minimum charging load regulation of the AC charging pile is used as the new charging load limit of the AC charging pile.

[0018] As a preferred solution of the charging power control and sorting method of the charging pile described in the present invention, wherein: responding to the control demand signal of the upper transformer and the current transformer includes: the control demand signal issued by the upper transformer is expressed as:

[0019] D1=p1-S1*f1

[0020] Wherein, D1 is the active power regulation demand of the upper transformer and D1>0, p1 is the real-time active load of the transformer, S1 is the rated capacity of the transformer, and f1 is the rated load power factor of the transformer;

[0021] The regulation demand signal of the transformer at this level is expressed as:

[0022] D2=p2-S2*f2

[0023] Wherein, D2 is the active power regulation demand of the transformer at this level and D2>0, p2 is the real-time active load of the transformer, S2 is the rated capacity of the transformer, and f2 is the rated load power factor of the transformer;

[0024] When (D1∪D2)<0, there is no need for regulation.

[0025] As a preferred solution of the charging pile charging power control and sorting method described in the present invention, the control demand is calculated according to the real-time active load, capacity and preset power factor of the transformer, and the final control demand is determined, which includes:

[0026] If p1-S1*f1>0, the real-time active load of the upper transformer exceeds its capacity, and active power regulation is required; if p1-S1*f1<0, the real-time active load of the upper transformer does not exceed its capacity, and active power regulation is not required;

[0027] If p2-S2*f2>0, the real-time active load of the transformer at this level exceeds its capacity, and active power regulation is required; if p2-S2*f2<0, the real-time active load of the transformer at this level does not exceed its capacity, and active power regulation is not required;

[0028] The maximum value of the active power regulation demand D1 of the upper transformer and the active power regulation demand D2 of the transformer at this level is selected as the final regulation demand D.

[0029] As a preferred solution of the charging power control and sorting method of the charging pile described in the present invention, wherein: calculating the total adjustable load of the charging pile, and determining the execution control amount based on the control demand and the total adjustable load includes: the total adjustable load is expressed as:

[0030] A q =∑(P ac -dz)+∑P dc *t

[0031] Among them, P ac is the real-time charging power of the AC charging pile, P dc is the real-time charging power of the DC charging pile, dz is the dead zone power value of the AC charging pile, and t is the adjustable range of the DC charging pile, expressed in percentage;

[0032] The execution control quantity is expressed as:

[0033] C q =min(D,A q ).

[0034] As a preferred solution of the charging power control and sorting method of the charging pile described in the present invention, it also includes: comparing the regulation demand with the total adjustable load, and selecting the smaller value as the actual regulation amount.

[0035] In a second aspect, the present invention provides a charging pile charging power control and sequencing system, including:

[0036] A control demand determination module is used to respond to the control demand signals of the upper-level transformer and the current-level transformer, calculate the control demand according to the real-time active load, capacity and preset power factor of the transformer, and determine the final control demand;

[0037] A calculation module, used to calculate the total amount of adjustable load of the charging pile, and determine the execution control amount based on the control demand and the total amount of adjustable load, wherein the charging pile includes a DC charging pile and an AC charging pile;

[0038] A control module is used to control the output power during charging according to the execution control amount.

[0039] In a third aspect, the present invention provides a computing device, comprising:

[0040] Memory and processor;

[0041] The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the charging pile charging power control and sorting method are implemented.

[0042] In a fourth aspect, the present invention provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the charging pile charging power control and sorting method.

[0043] Compared with the prior art, the present invention has the following beneficial effects: the present invention connects the charging piles to a public transformer, improves the utilization rate of the charging facilities and the quality of charging services, reduces the operating costs of the charging stations, improves the economic benefits and the operating efficiency of the charging operation control system, and relieves the system load during peak hours, greatly improving the system stability; the present invention adjusts the load conditions of the transformer at this level and the transformer at the previous level, is more friendly to the power grid, and has a wider power regulation coverage; the sampling time of monitoring data is shortened, the adjustment is faster, and the response is faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0045] Figure 1 A schematic diagram of a flow chart of a charging pile charging power control and sorting method and system according to an embodiment of the present invention;

[0046] Figure 2 A schematic diagram of charging data transmission of a charging pile charging power control and sorting method and system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0048] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0049] 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 term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0050] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0051] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] Example 1

[0054] Reference Figure 1 , is an embodiment of the present invention, which provides a charging pile charging power control and sorting method, including:

[0055] It is worth noting that the existing charging facilities need to build dedicated transformers or require dispatch intervention and lack unified management and control when controlling charging power; if the orderly charging control strategy is activated, the strategy cannot be exited in time according to the reduction of the distribution transformer power supply load, which is not friendly to charging users; if the power control amplitude is too large, it will also reduce the service life of the charging vehicle battery. In the implementation of this application, by adjusting the charging control strategy, the power control strategy is sorted according to load data, charging output power and vehicle SOC value, and accurate power demand management is used to achieve efficient and stable operation of the power grid, such as Figure 1 As shown:

[0056] S1: responding to the control demand signals of the upper transformer and the current transformer, calculating the control demand according to the real-time active load, capacity and preset power factor of the transformer, and determining the final control demand;

[0057] In the embodiment of the present application, the control demand signal in response to the upper transformer and the current transformer includes: the control demand signal issued by the upper transformer is expressed as:

[0058] D1=p1-S1*f1

[0059] Wherein, D1 is the active power regulation demand of the upper transformer and D1>0, p1 is the real-time active load of the transformer, S1 is the rated capacity of the transformer, and f1 is the rated load power factor of the transformer;

[0060] The regulation demand signal of the transformer at this level is expressed as:

[0061] D2=p2-S2*f2

[0062] Wherein, D2 is the active power regulation demand of the transformer at this level and D2>0, p2 is the real-time active load of the transformer, S2 is the rated capacity of the transformer, and f2 is the rated load power factor of the transformer;

[0063] When (D1∪D2)<0, there is no need for regulation.

[0064] In the embodiment of the present application, the regulation demand is calculated according to the real-time active load, capacity and preset power factor of the transformer, and the final regulation demand is determined, including:

[0065] If p1-S1*f1>0, the real-time active load of the upper transformer exceeds its capacity, and active power regulation is required; if p1-S1*f1<0, the real-time active load of the upper transformer does not exceed its capacity, and active power regulation is not required;

[0066] If p2-S2*f2>0, the real-time active load of the transformer at this level exceeds its capacity, and active power regulation is required; if p2-S2*f2<0, the real-time active load of the transformer at this level does not exceed its capacity, and active power regulation is not required;

[0067] The maximum value of the active power regulation demand D1 of the upper transformer and the active power regulation demand D2 of the transformer at this level is selected as the final regulation demand D.

[0068] In an optional embodiment, the load power factor may be set to 0.9, and the overload threshold may be set to 50% after approximate calculation. The overload threshold may be updated and calculated based on the preset load power factor.

[0069] S2: Calculate the total adjustable load of the charging pile, and determine the execution control amount based on the control demand and the total adjustable load. The charging piles include DC charging piles and AC charging piles.

[0070] In the embodiment of the present application, the total amount of adjustable load of the charging pile is calculated, and the execution control amount is determined based on the control demand and the total amount of adjustable load, including: the total amount of adjustable load is expressed as:

[0071] A q =∑(P ac -dz)+∑P dc *t

[0072] Among them, P ac is the real-time charging power of the AC charging pile, P dc is the real-time charging power of the DC charging pile, dz is the dead zone power value of the AC charging pile, and t is the adjustable range of the DC charging pile, expressed in percentage;

[0073] In an optional embodiment, the pulse width modulation duty cycle adjustment range of the AC charging pile is 1.4-7kW, the adjustment dead zone dz is 1.4kW, and the DC pile power adjustable range t is 80%.

[0074] The execution control quantity is expressed as:

[0075] C q =min(D,A q ).

[0076] In the embodiment of the present application, it also includes: comparing the control demand amount with the total adjustable load amount, and selecting the smaller value as the control amount actually executed.

[0077] It should be noted that in the embodiment of the present application, the control demand is compared with the total adjustable load, and the logic of selecting the smaller value as the actual control amount is to ensure that only the overload amount and the small value of the adjustable amount are adjusted to avoid over-regulation.

[0078] S3: Controlling the output power during charging according to the execution control amount.

[0079] In the embodiment of the present application, it also includes: when the charging platform controls the output power during charging according to the execution control amount, if there are multiple charging piles with charging loads, control is performed according to the control priority of the charging piles;

[0080] Set the control strategy of DC charging piles to the first priority, and the control strategy of AC charging piles to the second priority. The DC charging pile regulation priority is higher than the AC charging pile;

[0081] The various levels of charging piles that are given priority control are sorted according to the SOC values ​​of the charging vehicles, and charging piles with high SOC values ​​are controlled first; for example, when regulating DC charging piles, the charging power of DC piles with large SOC values ​​of the charging batteries is regulated first.

[0082] If there is a pile with multiple guns charging at the same time, the pile control sequence will be based on the minimum SOC value of all vehicles charged by the pile; for example, after the pile receives a control instruction, it can be adjusted according to the power control strategy set by the pile itself.

[0083] In an optional embodiment, when the pile receives the platform control instruction, it will evenly distribute the power control amount to all charging guns of the pile. The actual power control amount implemented may be smaller than the instruction issued by the platform. When the actual power control amount implemented is smaller than the instruction issued by the platform, the platform will detect, calculate and issue the control instruction again.

[0084] When the regulation demand of a charging pile is met, the charging load is stopped, and when the minimum value of the regulation demand and the total adjustable load is equal to 0, the regulation process ends.

[0085] In the embodiment of the present application, the various levels of the priority-regulated charging piles are sorted according to the SOC value of the charging vehicle, and the charging piles with high SOC values ​​are preferentially controlled, including:

[0086] When controlling the DC charging piles, the DC charging piles are arranged in descending order according to the SOC value of the charging vehicle, the real-time charging load of each DC charging pile is adjusted down by t, and the absolute value of the updated real-time charging load (1-t) is used as the new DC charging pile charging load limit; where t is the adjustable range of the DC charging pile, expressed as a percentage;

[0087] When controlling an AC charging pile, the regulation amount of each AC charging pile is the original charging load minus the minimum charging load of the AC charging pile, and the absolute value of the minimum charging load regulation of the AC charging pile is used as the new charging load limit of the AC charging pile.

[0088] It should be noted that the control strategy in the embodiment of the present application updates the transformer load and charging load data every 3 minutes. The control process is a dynamic and adaptive process. Through precise calculation and intelligent control, it not only optimizes the allocation of power resources, but also improves the response speed and operation efficiency of the power grid, ensuring the stable operation of the distribution transformer and the power demand of the charging load is met.

[0089] The above is a schematic scheme of a charging pile charging power control and its sorting method in this embodiment. It should be noted that the technical scheme of this charging pile charging power control and its sorting system and the technical scheme of the above-mentioned charging pile charging power control and its sorting method belong to the same concept. The details of the technical scheme of the charging pile charging power control and its sorting system in this embodiment that are not described in detail can all be referred to the description of the technical scheme of the above-mentioned charging pile charging power control and its sorting method.

[0090] In this embodiment, a charging pile charging power control and sequencing system includes:

[0091] A control demand determination module is used to respond to the control demand signals of the upper-level transformer and the current-level transformer, calculate the control demand according to the real-time active load, capacity and preset power factor of the transformer, and determine the final control demand;

[0092] A calculation module is used to calculate the total amount of adjustable load of the charging pile, and determine the execution control amount based on the control demand and the total amount of adjustable load. The charging pile includes a DC charging pile and an AC charging pile;

[0093] The control module is used to control the output power during charging according to the execution control amount.

[0094] This embodiment further provides a computing device, which is applicable to the case of charging pile charging power control and its sorting method, including:

[0095] Memory and processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the charging power control and sorting method of the charging pile as proposed in the above embodiment.

[0096] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the charging power control and sorting method of the charging pile proposed in the above embodiment is implemented.

[0097] The storage medium proposed in this embodiment and the method for realizing charging power control and sorting of charging piles proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0098] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ReadOnly, Memory, ROM), random access memory (RandomAccess Memory, RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform the methods of various embodiments of the present invention.

[0099] Example 2

[0100] Reference Figure 1-2 , is an embodiment of the present invention. This embodiment is different from the first embodiment in that this embodiment simulates transformer load data through platform A, receives charging process data from platform B, and determines whether the charging power control condition is reached through platform program related ideas, and then sends a power control instruction from platform A to the charging pile, which receives and processes the instruction. The output power during charging is limited according to the power value sent by the platform, verifying the beneficial effects of the present invention.

[0101] In this embodiment, when the four charging piles at the charging station of the live operation center of a power supply bureau all show that the network status is normal, the charging pile login request message is normal, the login result is normal, and the charging pile status and charging data are sent normally, Figure 2 As shown, perform scenario verification.

[0102] Scenario 1: Single-charger charging on a DC charging station

[0103] Control strategy settings: transformer rated capacity is 200kVA, rated power factor is 0.9, transformer overload threshold is 80%, DC pile controllable charging power ratio is 80%, AC pile minimum control power value is 1.4kW, and simulated transformer load is 187.6kW.

[0104] The platform calculates the control demand as 43.6kW through the parameter values ​​set by the strategy, the charging power is 50kW, and the controllable power is 40kW, so the execution control value is 40kW. The maximum output power sent to the charging pile for execution control through conversion is 10kW. The calculation verification data is shown in Table 1:

[0105] Table 1 Verification data

[0106]

[0107] Scenario 2: Two DC charging piles, one charging per pile

[0108] Control strategy settings: transformer rated capacity is 200kVA, rated power factor is 90%, transformer overload threshold is 80%, DC pile controllable charging power ratio is 80%, AC pile minimum control power value is 1.4kW, and simulated transformer load is 148.58kW.

[0109] In this embodiment, the DC pile is controlled first, and then the AC pile is controlled. The platform calculates the control demand as 4.58kW through the parameter values ​​set by the control strategy. The charging power with a larger SOC is 5.72kW and the controllable power is 4.58kW. The charging power with a smaller SOC is 52.03 and the controllable power is 41.62kW. The charging pile with a larger SOC is used for control, so the execution control value is 4.58kW. The maximum output power sent to charging pile 1 for execution control through conversion is 1.14kW. Charging pile 2 has no remaining demand allocation, so it does not execute control. The calculation verification data is shown in Table 2:

[0110] Table 2 Verification data

[0111]

[0112] Scenario 3: Charging with one DC charging station and one AC charging station

[0113] Control strategy settings: transformer rated capacity is 200kVA, rated power factor is 0.9, transformer overload threshold is 80%, DC pile controllable charging power ratio is 80%, AC pile minimum control power value is 1.4kW, and simulated transformer load is 230.4kW.

[0114] The platform calculates the control demand as 86.4kW through the parameter values ​​set by the strategy. The charging power of the DC pile is 27.97kW, the controllable power is 22.38kW, the charging power of the AC pile is 5.53, the controllable power is 5.53kW, and the total controllable quantity is 27.91. The controllable quantity is smaller than the demand, so the execution control value is 27.91kW, and the execution control value of the DC pile is 22.38kW. The maximum output power sent to the DC pile for execution control through conversion is 5.59kW. The execution control value of the AC pile is 5.53kW, and the maximum output power sent to the DC pile for execution control through conversion is 1.40kW. The calculation verification data is shown in Table 3:

[0115] Table 3 Verification data

[0116]

[0117] Scenario 4: Charging with an AC charging station

[0118] Control strategy settings: transformer rated capacity is 200kVA, rated power factor is 0.85, transformer overload threshold is 80%, DC pile controllable charging power ratio is 80%, AC pile minimum control power value is 1.4kW, and simulated transformer load is 179.6kW.

[0119] The platform calculates the control demand as 43.6kW through the parameter values ​​set by the strategy, the charging power of the AC pile is 6.98kW, the controllable power is 5.58kW, the execution control value is 5.58kW, and the maximum output power sent to the DC pile for execution control through conversion is 1.40kW. The calculation verification data is shown in Table 4:

[0120] Table 4 Verification data

[0121]

[0122]

[0123] Scenario 5: Charging with two AC charging piles

[0124] Control strategy settings: transformer rated capacity is 200kVA, rated power factor is 0.9, transformer overload threshold is 80%, DC pile controllable charging power ratio is 80%, AC pile minimum control power value is 1.4kW, and simulated transformer load is 187.6kW.

[0125] The platform calculates the control demand as 43.6kW through the parameter values ​​set by the strategy. The charging power of the AC piles is 6.99kW, the controllable power is 5.59kW, and the execution control value is 5.58kW. The maximum output power sent to the two AC piles for execution control through conversion is 1.40kW. The calculation verification data is shown in Table 5:

[0126] Table 5 Verification data

[0127]

[0128]

[0129] By simulating the transformer load data and judging the actual charging power data, the control power command is issued to control the charging output power of the charging pile. The charging output power of the charging pile can be successfully controlled. The present invention connects the charging pile to the public transformer, optimizes the layout of the charging facilities, and improves the utilization rate of the charging facilities and the quality of charging services. The operating cost of the charging station is significantly reduced, and the economic benefits are obvious. Through comparative experiments, the expenses of the present invention in each time period are lower than those of the traditional method. The present invention also improves the operating efficiency of the charging operation control system, and can ensure that the distribution transformer is not overloaded during peak load periods, further improving the stability of the system. The load conditions of the transformer at this level and the transformer at the previous level are adjusted, which is more friendly to the power grid and has a wider power regulation coverage. The sampling time of monitoring data is shortened, the adjustment is faster, and the response is faster.

[0130] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A charging pile charging power control and sorting method, characterized in that: include: In response to the regulation demand signals of the upper transformer and the current transformer, the regulation demand is calculated according to the real-time active load, capacity and preset power factor of the transformer, and the final regulation demand is determined; Calculating the total amount of adjustable load of the charging pile, and determining the execution control amount based on the control demand and the total amount of adjustable load, wherein the charging pile includes a DC charging pile and an AC charging pile; The output power during charging is controlled according to the execution control amount.

2. The charging pile charging power control and sorting method as claimed in claim 1, characterized in that: Also includes: When the charging platform controls the output power during charging according to the execution control amount, if there are multiple charging piles with charging loads, the charging piles are controlled according to the control priority of the charging piles; Set the control strategy of DC charging piles to the first priority, and the control strategy of AC charging piles to the second priority. The DC charging pile regulation priority is higher than the AC charging pile; The priority charging piles are sorted according to the SOC values ​​of the vehicles being charged, with the charging piles with high SOC values ​​being given priority. If there are multiple charging guns on one pile and they are charging at the same time, the pile control is sorted according to the minimum SOC value of all vehicles being charged by the pile. When the regulation demand of a charging pile is met, the charging load is stopped, and when the minimum value of the regulation demand and the total adjustable load is equal to 0, the regulation process ends.

3. The charging pile charging power control and sorting method as claimed in claim 2, characterized in that: The priority charging piles are sorted according to the SOC value of the charging vehicle. The charging piles with high SOC values ​​are prioritized, including: When controlling the DC charging piles, the DC charging piles are arranged in descending order according to the SOC value of the charging vehicle, the real-time charging load of each DC charging pile is adjusted down by t, and the absolute value of the updated real-time charging load (1-t) is used as the new DC charging pile charging load limit; where t is the adjustable range of the DC charging pile, expressed as a percentage; When controlling the AC charging pile, the regulation amount of each AC charging pile is the original charging load minus the minimum charging load of the AC charging pile, and the absolute value of the minimum charging load regulation of the AC charging pile is used as the new charging load limit of the AC charging pile.

4. The charging pile charging power control and sorting method as claimed in claim 3, characterized in that: The control demand signal in response to the upper transformer and the transformer at this level includes: the control demand signal issued by the upper transformer is expressed as: D1=p1-S1*f1 Wherein, D1 is the active power regulation demand of the upper transformer and D1>0, p1 is the real-time active load of the transformer, S1 is the rated capacity of the transformer, and f1 is the rated load power factor of the transformer; The regulation demand signal of the transformer at this level is expressed as: D2=p2-S2*f2 Wherein, D2 is the active power regulation demand of the transformer at this level and D2>0, p2 is the real-time active load of the transformer, S2 is the rated capacity of the transformer, and f2 is the rated load power factor of the transformer; When (D1 ∪ D2)<0, there is no regulation demand.

5. The charging pile charging power control and sorting method as claimed in claim 4, characterized in that: The regulation demand is calculated based on the transformer's real-time active load, capacity and preset power factor, and the final regulation demand is determined to include: If p1-S1*f1>0, the real-time active load of the upper transformer exceeds its capacity, and active power regulation is required; if p1-S1*f1<0, the real-time active load of the upper transformer does not exceed its capacity, and active power regulation is not required; If p2-S2*f2>0, the real-time active load of the transformer at this level exceeds its capacity, and active power regulation is required; if p2-S2*f2<0, the real-time active load of the transformer at this level does not exceed its capacity, and active power regulation is not required; The maximum value of the active power regulation demand D1 of the upper transformer and the active power regulation demand D2 of the transformer at this level is selected as the final regulation demand D.

6. The charging pile charging power control and sorting method as claimed in claim 5, characterized in that: Calculating the total amount of adjustable load of the charging pile, and determining the execution control amount based on the control demand and the total amount of adjustable load includes: the total amount of adjustable load is expressed as: A q =∑(P ac -dz)+∑P dc *t Among them, P ac is the real-time charging power of the AC charging pile, P dc is the real-time charging power of the DC charging pile, dz is the dead zone power value of the AC charging pile, and t is the adjustable range of the DC charging pile, expressed in percentage; The execution control quantity is expressed as: C q =min(D,A q ) 7. The charging pile charging power control and sorting method as claimed in claim 6, characterized in that: Also includes: Compare the control demand with the total adjustable load, and select the smaller value as the actual control amount.

8. A charging pile charging power control and sorting system, characterized in that: include: A control demand determination module is used to respond to the control demand signals of the upper-level transformer and the current-level transformer, calculate the control demand according to the real-time active load, capacity and preset power factor of the transformer, and determine the final control demand; A calculation module, used to calculate the total amount of adjustable load of the charging pile, and determine the execution control amount based on the control demand and the total amount of adjustable load, wherein the charging pile includes a DC charging pile and an AC charging pile; A control module is used to control the output power during charging according to the execution control amount.

9. An electronic device, comprising: Memory and processor; The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the charging pile charging power control and sorting method described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the charging pile charging power control and sorting method as described in any one of claims 1 to 7.

Images