A charging pile group power regulation method, system, device and medium

Abstract

The application provides a charging pile group power regulation method, system, device and medium, comprising: determining the priority of each charging pile based on the parameters of the interaction between each charging pile and the building equipment management system by using a pre-prepared priority algorithm; calculating the total power of the charging pile group and the remaining available power of the charging pile group based on the parameters of the interaction between each charging pile and the building equipment management system; when the total power of the charging pile group enters a pre-set power adjustment buffer zone, regulating the output power of each charging pile based on the priority of each charging pile and the remaining available power of the charging pile group; the application adopts a priority-based regulation algorithm combined with a power regulation strategy, solves the problem that the existing charging pile distribution capacity is smaller than the sum of the rated power of all charging piles, and affects the safe operation of the charging station, realizes that the sum of the actual charging power of all charging piles is less than the actual configured distribution capacity, and ensures the safe operation of the charging station.

Description

Technical Field

[0001] This invention relates to the field of power distribution area construction, specifically to a method, system, equipment, and medium for regulating the power of a charging pile group. Background Technology

[0002] As the number of electric vehicles continues to grow rapidly, the number of public charging stations is also steadily increasing, but the construction speed of charging stations is still significantly slower than the growth rate of electric vehicle ownership.

[0003] DC fast charging stations located in urban commercial areas need to meet users' demands for centralized and rapid charging due to their unique geographical location. When investing in and constructing charging stations, charging station operators generally make full use of parking spaces to install as many charging piles as possible. However, considering that the simultaneous utilization rate of charging piles is not high for most of the day, the configured power distribution capacity is actually less than the sum of the rated power of all charging piles, affecting the safe operation of the charging station. Therefore, how to ensure that the total charging power of the charging piles is always lower than the power distribution capacity is a problem that needs to be solved. Summary of the Invention

[0004] To address the issue that when existing charging piles are used simultaneously, the actual configured power distribution capacity is less than the sum of the rated power of all charging piles, affecting the safe operation of the charging station, this invention provides a charging pile group power regulation method, including:

[0005] Based on the parameters of the interaction between each charging pile and the building equipment management system, the priority of each charging pile is determined using a pre-defined priority algorithm.

[0006] Based on the parameters obtained from the interaction between each charging pile and the building equipment management system, the total power of the charging pile group and the remaining available power of the charging pile group are calculated.

[0007] When the total power of the charging pile group enters the pre-set power adjustment buffer zone, the output power of each charging pile is adjusted based on the priority of each charging pile and the remaining available power of the charging pile group.

[0008] The priority algorithm is based on the electric vehicle's charging speed factor, basic priority, incremental priority, and charging state factor.

[0009] Preferably, the setting of the power adjustment buffer includes:

[0010] Active power warning values ​​are determined based on the general standard values ​​of distribution transformer capacity;

[0011] The difference between the rated active power value of the distribution transformer and the active power warning value is determined as the power adjustment buffer zone;

[0012] The parameters that each charging pile interacts with the building equipment management system include: the capacity of the distribution transformer and the rated active power value of the distribution transformer.

[0013] Preferred, the active power warning value is calculated using the following formula:

[0014] P LimValue =λ·S Grid ,λ<1;

[0015] In the formula, λ is the warning factor when entering power regulation mode; P LimValue This is the active power warning value; S Grid This refers to the capacity of the distribution transformer.

[0016] Preferred, the parameters that each charging pile interacts with the building equipment management system also include one or more of the following: charging mode, current state of charge, remaining charging time, cumulative charging time, rated capacity, rated total voltage, initial state of charge, current battery voltage, charging current status, and temperature status.

[0017] Priority is given to determining the priority of each charging pile based on parameters exchanged between each charging pile and the building equipment management system, using a pre-defined priority algorithm, including:

[0018] The charging speed factor of the electric vehicle's power battery is determined based on the charging mode.

[0019] The basic priority value of the electric vehicle power battery is determined based on the priority corresponding to the rated capacity, the priority corresponding to the rated total voltage, the priority corresponding to the initial state of charge, and the priority corresponding to the current battery voltage.

[0020] The incremental priority value of the electric vehicle power battery is determined based on the priority corresponding to the charging mode of the electric vehicle power battery, the priority corresponding to the current state of charge, the priority corresponding to the remaining charging time, and the priority corresponding to the cumulative charging time.

[0021] The state of charge factor of an electric vehicle power battery is determined based on its state of charge, state of charging current, and state of temperature.

[0022] The priority of a charging station is obtained by multiplying the sum of the basic priority value and the incremental priority value of the electric vehicle power battery with the charging speed factor and the charging state factor of the electric vehicle power battery.

[0023] Preferred, the basic priority value is calculated using the following formula:

[0024] K BasePri =K B_Ca +K B_U+K SOC_Init +K U_RealTime ;

[0025] In the formula, K BasePri Basic priority value; K B_Ca K represents the priority value corresponding to the rated capacity of the vehicle's power battery system. B_U K represents the priority value corresponding to the rated total voltage of the vehicle's power battery system. SOC_Init K represents the priority value corresponding to the initial state of charge of the vehicle's power battery. U_RealTime This is the priority value corresponding to the current battery voltage of the vehicle's power battery.

[0026] Preferred, the calculation of the total power and remaining available power of the charging pile group based on the parameters interacted between each charging pile and the building equipment management system includes:

[0027] The power of each charging pile is determined based on the parameters obtained from the interaction between each charging pile and the building equipment management system, and the total power of the charging pile group is obtained by summing the power of each charging pile.

[0028] The remaining usable power of the charging pile group is obtained by subtracting the rated active power value of the distribution transformer from the total power of the charging pile group.

[0029] Priority is given to adjusting the output power of each charging pile based on its priority and the remaining available power of the charging pile group, which includes:

[0030] The power adjustment threshold is determined based on the priority of all charging stations;

[0031] Among all charging piles, the output power of charging piles with a priority lower than the power adjustment threshold will be reduced to the lowest output power; the output power of charging piles with a priority greater than or equal to the power adjustment threshold will be increased.

[0032] When the total output power of all charging piles after adjustment is less than the total power limit, the charging piles with a priority lower than the power adjustment threshold will be adjusted up in order of priority until the total output power after adjustment is equal to the total power limit.

[0033] Preferably, after calculating the total power and remaining available power of the charging pile group based on the parameters exchanged between each charging pile and the building equipment management system, the method further includes:

[0034] When the total power of all charging piles does not enter the pre-set power adjustment buffer zone, each charging pile outputs power based on the autonomous control mode.

[0035] Based on the same inventive concept, the present invention also provides a power regulation system for a charging pile group, comprising:

[0036] The priority determination module is used to determine the priority of each charging pile based on the parameters exchanged between each charging pile and the building equipment management system, using a pre-defined priority algorithm.

[0037] The calculation module is used to calculate the total power of the charging pile group and the remaining available power of the charging pile group based on the parameters exchanged between each charging pile and the building equipment management system.

[0038] The control module is used to adjust the output power of each charging pile based on the priority of each charging pile and the remaining available power of the charging pile group when the total power of the charging pile group enters the preset power adjustment buffer.

[0039] The priority algorithm is based on the electric vehicle's charging speed factor, basic priority, incremental priority, and charging state factor.

[0040] Furthermore, this application also provides a computer device, comprising:

[0041] One or more processors;

[0042] The processor is used to store one or more programs;

[0043] When the one or more programs are executed by the one or more processors, the above-described method for regulating the power of a charging pile group is implemented.

[0044] In another aspect, this application also provides a computer-readable storage medium, characterized in that it stores a computer program thereon, which, when executed, implements the above-mentioned charging pile group power regulation method.

[0045] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0046] This invention provides a method, system, device, and medium for power regulation of charging pile groups, comprising: determining the priority of each charging pile based on parameters interacting with the building equipment management system and using a pre-defined priority algorithm; calculating the total power and remaining available power of the charging pile group based on the parameters interacting with the building equipment management system; and regulating the output power of each charging pile based on its priority and the remaining available power when the total power of the charging pile group enters a pre-set power adjustment buffer. The priority algorithm is based on the charging speed factor, basic priority, incremental priority, and charging state factor of the electric vehicle. This invention employs a priority-based power regulation algorithm combined with a charging power regulation strategy, solving the problem that when charging piles are used simultaneously, the actual configured power distribution capacity is less than the sum of the rated power of all charging piles, affecting the safe operation of the charging station. This invention achieves the goal of regulating and controlling the sum of the actual charging power of all charging piles to be less than the actual configured power distribution capacity, thus ensuring the safe operation of the charging station. Attached Figure Description

[0047] Figure 1 This is a flowchart of a power regulation method for a charging pile group provided by the present invention;

[0048] Figure 2 This is a schematic diagram of the power distribution transformer capacity allocation of the present invention;

[0049] Figure 3 The total number of charging priorities N in this invention pri_i Composition diagram;

[0050] Figure 4 This is a schematic diagram of the charging pile group in operation according to the present invention.

[0051] Figure 5 This is a schematic diagram of the DC charging power regulation system architecture of the present invention. Detailed Implementation

[0052] To better understand the present invention, the following description, in conjunction with the accompanying drawings and examples, will further illustrate the content of the present invention.

[0053] Example 1:

[0054] This invention provides a method for power regulation of charging pile groups, such as... Figure 1 As shown, it includes:

[0055] Step 1: Based on the parameters exchanged between each charging pile and the building equipment management system, determine the priority of each charging pile using a pre-defined priority algorithm;

[0056] Step 2: Based on the parameters exchanged between each charging pile and the building equipment management system, calculate the total power of the charging pile group and the remaining available power of the charging pile group;

[0057] Step 3: When the total power of the charging pile group enters the pre-set power adjustment buffer zone, the output power of each charging pile is adjusted based on the priority of each charging pile and the remaining available power of the charging pile group.

[0058] The priority algorithm is based on the electric vehicle's charging speed factor, basic priority, incremental priority, and charging state factor.

[0059] In this embodiment, a power adjustment buffer is set up according to the rated capacity of the distribution transformer. When the total output power of the charging pile enters the buffer, the power regulation priority algorithm starts to work and limits the output power of the charging pile. When the total output power of the charging pile leaves the buffer, the power regulation priority algorithm no longer works and the charging pile enters the autonomous output power control mode.

[0060] Based on the different ratios of the total load power to the rated total power of the distribution transformer, the charging process can be controlled according to different strategies, and the operating status of the distribution transformer can be divided into different modes.

[0061] The following is a detailed introduction to the setting of the power adjustment buffer:

[0062] The settings for the power adjustment buffer include:

[0063] Active power warning values ​​are determined based on the general standard values ​​of distribution transformer capacity;

[0064] The difference between the rated active power value of the distribution transformer and the active power warning value is determined as the power adjustment buffer zone;

[0065] The parameters that each charging pile interacts with the building equipment management system include: the capacity of the distribution transformer and the rated active power value of the distribution transformer. A schematic diagram of the distribution transformer capacity allocation is shown below. Figure 2 As shown.

[0066] 1) Under normal circumstances, the actual capacity of the distribution transformer is set as S. Grid ,

[0067] The rated active power value p of the power supply is generally 0.9 times the transformer capacity.

[0068] 2) Active power warning value P LimValue Calculation:

[0069] P LimValue =λ·S Grid ,λ<1;

[0070] Where λ is the warning factor when entering power regulation mode, with a value of 0.75. Active power warning value p LimValue and the rated active power value P of the transformer Grid The power range P between Buf This will serve as a "power adjustment buffer," within which the power regulation priority algorithm will operate:

[0071] P Buf =P Grid -P LimValue ;

[0072] The size of the power buffer can affect the system's adjustment speed. A smaller power buffer results in faster system adjustment, but it also makes the system more prone to power oscillations at critical states. Conversely, a larger power buffer leads to premature entry into power-limiting states, reducing the system's response speed. Furthermore, as charging continues, the charging current decreases, or the charging port disconnects, and the available power value becomes greater than P. Buf Then, exit the power control mode and enter the free power mode.

[0073] In this embodiment, step 1 determines the priority of each charging pile based on the parameters exchanged between each charging pile and the building equipment management system using a pre-defined priority algorithm, including:

[0074] The charging speed factor of the electric vehicle's power battery is determined based on the charging mode.

[0075] The basic priority value of the electric vehicle power battery is determined based on the priority corresponding to the rated capacity, the priority corresponding to the rated total voltage, the priority corresponding to the initial state of charge, and the priority corresponding to the current battery voltage.

[0076] The incremental priority value of the electric vehicle power battery is determined based on the priority corresponding to the charging mode of the electric vehicle power battery, the priority corresponding to the current state of charge, the priority corresponding to the remaining charging time, and the priority corresponding to the cumulative charging time.

[0077] The charging state factor of the electric vehicle power battery is determined based on the current state of charge, charging current, and temperature of the electric vehicle power battery.

[0078] The priority of a charging station is obtained by multiplying the sum of the basic priority value and the incremental priority value of the electric vehicle power battery with the charging speed factor and the charging state factor of the electric vehicle power battery.

[0079] Furthermore, the charging speed factor of the electric vehicle's power battery is determined based on the charging mode, specifically including:

[0080] Charging speed factor KSCM This reflects the user's choice of charging speed, which is input through the charging station interface and is divided into fast charging mode K. SCM_Quick K and normal charging mode SCM_Normal In general, the default setting is K. SCM_Quick =1.3, K SCM_Normal =1.0.

[0081] In fast charging mode, the corresponding charging priority is high, the charging power is guaranteed first, and the charging unit price is higher. It is suitable for users who need to quickly replenish their power within a limited time.

[0082] Furthermore, based on the priority corresponding to the rated capacity, the priority corresponding to the rated total voltage, the priority corresponding to the initial state of charge, and the priority corresponding to the current battery voltage of the electric vehicle power battery, the basic priority value of the electric vehicle power battery is determined, specifically including:

[0083] Basic Priority K BasePri Based on the relevant parameters of the electric vehicle's power battery during the charging handshake phase and charging parameter configuration phase on the CAN link, the urgency of the power battery's charging needs is reflected, including:

[0084] K BasePri =K B_Ca +K B_U +K SOC_Init +K U_RealTime ;

[0085] Where: K B_Ca K represents the priority corresponding to the rated capacity of the vehicle's power battery system. B_U K represents the priority corresponding to the rated total voltage of the vehicle's power battery system. SOC_Init K represents the priority corresponding to the initial state of charge of the vehicle's power battery. U_RealTime The priority corresponding to the current battery voltage of the vehicle's power battery.

[0086] A larger rated capacity of the power battery system indirectly reflects its high power demand and long charging time, thus its corresponding charging priority is also higher. Taking 40kWh as a baseline, for every 5kWh increase or decrease, the priority of the vehicle's power battery system increases or decreases by 3, as expressed by the formula:

[0087]

[0088] Among them, Q B_Ca K represents the rated capacity of the vehicle's power battery system. B_Ca Prioritize the rated capacity of the vehicle's power battery system.

[0089] A higher rated total voltage of the battery system indirectly reflects a higher power demand, and therefore a higher charging priority. Using 400V as a baseline, every 40V change corresponds to a 1-level change in the priority of the vehicle's power battery system's rated total voltage, expressed by the formula:

[0090]

[0091] Among them, U B_Total K represents the rated total voltage of the vehicle's power battery system. B_U Priority is assigned to the rated total voltage of the vehicle's power battery system.

[0092] Initial State of Charge (SOC) of the vehicle's power battery Init The corresponding priority K SOC_Init The calculation process is as follows:

[0093] The initial state of charge (SOC) affects battery life, charging mode, charging power limit, and the urgency of the user's charging needs. This can be expressed by the formula:

[0094] K SOC_Init =Function(SOC) Init );

[0095] Among them, SOC Init Initial state of charge of the vehicle's power battery, K SOC_Init The priority corresponding to the initial state of charge of the vehicle's power battery.

[0096] SOC Init With K SOC_Init For details of the correspondence, please refer to Table 2-2.

[0097] Table 2-2 Initial state of charge and its priority number

[0098]

[0099] The priority K corresponding to the current battery voltage of the vehicle's power battery U_RealTime The determination process is as follows:

[0100] The ratio of the current battery voltage to the battery's rated total voltage (Ratio) is calibrated using the OCV-SOC curve to obtain the priority parameter, which reflects the impact of charging voltage on the health of the power battery.

[0101] ① When 0.967 ≤ Ratio, K U_RealTime =15;

[0102] ② When 0.960 ≤ Ratio < 0.967, K U_RealTime =2;

[0103] ③ When Ratio < 0.960, K U_RealTime = -5.

[0104] The incremental priority value of the electric vehicle power battery is determined based on the priority corresponding to the charging mode of the electric vehicle power battery, the priority corresponding to the current state of charge, the priority corresponding to the remaining charging time, and the priority corresponding to the cumulative charging time.

[0105] Incremental priority ΔK Pri Based on relevant parameters of the charging stage on the CAN link, it reflects the impact of factors such as the current charging progress of the power battery, the current state of charge, the cumulative charging time, and the estimated remaining charging time on the charging priority.

[0106] Various charging modes K CM The corresponding priority values ​​are as follows:

[0107] Based on the charging characteristics of lithium-ion batteries, namely the charging characteristics of constant current followed by constant voltage, the constant current stage has high power and long duration, and should be prioritized.

[0108] Therefore, in constant current charging mode, K CM =15; In constant voltage charging mode, K CM =5.

[0109] The priority K corresponding to the current state of charge SOC_RealTime The determination process is as follows:

[0110] The difference in real-time SOC during charging affects factors such as charging progress, charging mode, and charging power distribution. The formula is expressed as follows:

[0111] K SOC_RealTime =Function(SOC) RealTime );

[0112] Among them, SOC RealTime K represents the current state of charge of the power battery. SOC_RealTime The priority corresponding to the current state of charge of the power battery.

[0113] K SOC_RealTime With SOC RealTime For details of the correspondence, please refer to Table 2-3.

[0114] Table 2-3 Real-time State of Charge and its Priority

[0115] Tab.2-3 Real-time state of charge and its priority number

[0116]

[0117] Remaining charging time T Remaining This reflects the remaining charging power and capacity. Assuming a 50Ah, 90kW charge takes one hour to fully charge, fast charging to 80% takes 35 minutes, leaving 25 minutes with low priority. Assuming an average charging time of 2 hours, if the remaining charging time is less than 39 minutes, the priority is 0; if it's less than 10 minutes, the estimated remaining charging time corresponds to a priority of -3.

[0118] The corresponding priority calculation formula is expressed as:

[0119]

[0120] Among them, T Remaining Estimate remaining charging time; K T_Remaining Priority for remaining charging time

[0121] This displays the time already spent waiting or charging. The first 15 minutes are disregarded; thereafter, the priority of the accumulated charging time increases by 5 for every 20 minutes.

[0122] The priority calculation formula in this scenario is:

[0123]

[0124] Among them, T Total K represents the cumulative charging time. T_Total Priority is assigned based on cumulative charging time. This is the floor symbol.

[0125] The charging state factor of the electric vehicle power battery is determined based on the current state of charge, charging current, and temperature of the electric vehicle power battery.

[0126] Current charging state factor K CS The corresponding priority values ​​are as follows:

[0127] Current charging state factor K CS This measures the health status of the power battery pack during the charging regulation process, categorized into good and sub-healthy states. In a good state, K... CS_G =1.0.

[0128] There are three situations when one is in a sub-healthy state:

[0129] 1) When SOC is too high / too low, K CS_SOC =0.5, otherwise K CS_SOC =1.0;

[0130] Excessively high or low SOC poses a significant threat to the health and safety of power batteries, thus requiring a timely and substantial reduction in charging current.

[0131] 2) When the battery is charging with overcurrent, K CS_OverCur =0.5, otherwise, K CS_OverCur =1.0;

[0132] Overcurrent during battery charging can pose a significant safety threat to related equipment, so it is necessary to reduce the charging current significantly and promptly.

[0133] 3) When the battery temperature is too high, K CS_OverTemp =0.9, otherwise K CS_OverTemp =1.0.

[0134] Excessive battery temperature affects the safety of the power battery, so it is necessary to reduce the priority and thus reduce the charging current. However, considering that the response to temperature reduction is slow, the adjustment coefficient should not be too low, otherwise overshoot will have a significant impact on other priority factors.

[0135] The expression for the current charging state factor is:

[0136] K CS =K CS_G ·K CS_SOC ·K CS_OverCur ·K CS_OverTemp

[0137] The priority of a charging station is obtained by multiplying the sum of the basic priority value and the incremental priority value of the electric vehicle power battery with the charging speed factor and the charging state factor of the electric vehicle power battery.

[0138] The starting state, charging speed, and power demand of the electric vehicle connected to the charging station are determined based on factors such as the charging status, charging speed, and power requirements, and are calculated using the following formula:

[0139] Charging priority = (Charging speed factor) × (Base priority + Incremental priority) × (Charging state factor)

[0140] By using the textual expression and substituting the relevant parameters mentioned above, we can obtain the following calculation formula:

[0141] N Pri_i =K SCM ·(K BasePri +ΔK Pri )·K CS

[0142] Therefore, the total number of priorities N in real time can be calculated based on relevant parameters. Pri_i ,like Figure 3 As shown.

[0143] In this embodiment, the calculation of the total power and remaining available power of the charging pile group based on the parameters exchanged between each charging pile and the building equipment management system in step 2 includes:

[0144] The power of each charging pile is determined based on the parameters obtained from the interaction between each charging pile and the building equipment management system, and the total power of the charging pile group is obtained by summing the power of each charging pile.

[0145] The remaining usable power of the charging pile group is obtained by subtracting the rated active power value of the distribution transformer from the total power of the charging pile group.

[0146] Furthermore, the power of each charging pile is determined based on the parameters exchanged between each charging pile and the building equipment management system. The total power of the charging pile group is then obtained by summing the power of each charging pile. This process specifically includes: charging pile power-on initialization, controller power-on initialization, and network setup. Once the electric vehicle is connected to the charging gun, the CAN communication process begins.

[0147] During the charging handshake and charging parameter configuration phases, the power controller PCM only listens to and records the parameter information of the charging pile and power battery on the CAN communication link, and saves it in the flash memory of the PCM for subsequent parameter calculation. It does not control the communication parameters.

[0148] During the charging phase, the power controller listens for and saves BCL / BCS / CCS / BSM messages on the CAN link, and sends data to other power controllers in sequence via the power control bus, as shown in Table 2-4.

[0149] Table 2-4 Summary of Interaction Information on the Power Control Bus

[0150] Tab.2-4 Sorting out the information exchanged on the power controlbus

[0151]

[0152] First, the charging priority N of each component is calculated in real time. Pri_i By using the calculation formula and substituting the relevant parameters, you can calculate your own charging priority N. Pri_i .

[0153] Then, calculate and save the real-time requested power of this power controller.

[0154] P Req_i =U Req_i ·I Req_i ;

[0155] In the formula, UReq_i I represents the real-time requested voltage for the i-th charging pile. Req_i P represents the real-time requested current for the i-th charging pile. Req_i Let be the real-time requested power of the i-th charging pile.

[0156] Finally, [N] Adder ,P Req_i N Pri_i This set of parameters is sent to the power control bus according to the timing sequence, and receives real-time parameters from other power controllers on the power control bus. [N] Adder ,P Req_i N Pri_i Save the data for later use in power regulation calculations.

[0157] Furthermore, the remaining usable power of the charging pile group is obtained by subtracting the rated active power value of the distribution transformer from the total power of the charging pile group, specifically including:

[0158] After each power controller sends and receives data sequentially according to the timing described above, the subsequent processing timing is as follows:

[0159] 1) Calculate the real-time maximum total power P MAX_Total :

[0160]

[0161] In the formula, P MAX_Total This represents the real-time maximum total power of the power controller.

[0162] 2) Calculate the remaining available power P RemainAvailb :

[0163] P RemainAvailb =P Transf -P MAX_Total ;

[0164] In the formula, P RemainAvailb P represents the remaining available power. Transf This represents real-time power.

[0165] In this embodiment, step 3, which involves adjusting the output power of each charging pile based on its priority and the remaining available power of the charging pile group, includes:

[0166] The power adjustment threshold is determined based on the priority of all charging stations;

[0167] Among all charging piles, the output power of charging piles with a priority lower than the power adjustment threshold will be reduced to the lowest output power; the output power of charging piles with a priority greater than or equal to the power adjustment threshold will be increased.

[0168] When the total output power of all charging piles after adjustment is less than the total power limit, the charging piles with a priority lower than the power adjustment threshold will be adjusted up in order of priority until the total output power after adjustment is equal to the total power limit.

[0169] Furthermore, determining the power adjustment threshold based on the priority of all charging piles specifically includes: all operating charging piles are sorted by priority from highest to lowest, and the median value is used as the priority median for all charging piles to determine the power adjustment threshold. Further, among all charging piles, the output power of charging piles with a priority lower than the power adjustment threshold is reduced to the minimum output power; the output power of charging piles with a priority greater than or equal to the power adjustment threshold is increased, specifically including:

[0170] 1) When the priority of any charging pile is less than the median of the priorities of all charging piles, the power controller of that charging pile will reduce its output power to the preset minimum output power.

[0171] 2) For charging piles with a priority greater than the median priority of all charging piles, their output power is increased by a preset allowable value based on the existing level. Further, when the total output power of all adjusted charging piles is less than the total power limit, charging piles with a priority lower than the power adjustment threshold are sequentially increased in priority until the total adjusted output power equals the total power limit. Specifically, this includes:

[0172] First, adjust the output power of charging piles with priorities lower than the median to the lowest level. Then, increase the output power of controllers with higher priorities in sequence. If there is still available power, continue to increase the power as described in step 2) until the preset total power limit is reached.

[0173] Example 2:

[0174] Based on the same inventive concept, the present invention also provides a power regulation system for a charging pile group, comprising:

[0175] The priority determination module is used to determine the priority of each charging pile based on the parameters exchanged between each charging pile and the building equipment management system, using a pre-defined priority algorithm.

[0176] The calculation module is used to calculate the total power of the charging pile group and the remaining available power of the charging pile group based on the parameters exchanged between each charging pile and the building equipment management system.

[0177] The control module is used to adjust the output power of each charging pile based on the priority of each charging pile and the remaining available power of the charging pile group when the total power of the charging pile group enters the preset power adjustment buffer.

[0178] The priority algorithm is based on the electric vehicle's charging speed factor, basic priority, incremental priority, and charging state factor.

[0179] The priority determination module is specifically used for:

[0180] The starting state, charging speed, and power demand of the electric vehicle connected to the charging station are determined based on factors such as the charging status, charging speed, and power requirements, and are calculated using the following formula:

[0181] Charging priority = (Charging speed factor) × (Base priority + Incremental priority) × (Charging state factor)

[0182] The charging speed factor of the electric vehicle's power battery is determined based on the charging mode.

[0183] Charging speed factor K SCM This reflects the user's choice of charging speed, which is input through the charging station interface and is divided into fast charging mode K. SCM_Quick K and normal charging mode SCM_Normal In general, the default setting is K. SCM_Quick =1.3, K SCM_Normal =1.0.

[0184] In fast charging mode, the corresponding charging priority is high, the charging power is guaranteed first, and the charging unit price is higher. It is suitable for users who need to quickly replenish their power within a limited time.

[0185] Basic Priority K BasePri Based on the relevant parameters of the electric vehicle's power battery during the charging handshake phase and charging parameter configuration phase on the CAN link, the urgency of the power battery's charging needs is reflected, including:

[0186] K BasePri =K B_Ca +K B_U +K SOC_Init +K U_RealTime ;

[0187] Where: K B_Ca K represents the priority corresponding to the rated capacity of the vehicle's power battery system. B_U K represents the priority corresponding to the rated total voltage of the vehicle's power battery system. SOC_Init K represents the priority corresponding to the initial state of charge of the vehicle's power battery. U_RealTime The priority corresponding to the current battery voltage of the vehicle's power battery.

[0188] A larger rated capacity of the power battery system indirectly reflects its high power demand and long charging time, thus its corresponding charging priority is also higher. Taking 40kWh as a baseline, for every 5kWh increase or decrease, the priority of the vehicle's power battery system increases or decreases by 3, as expressed by the formula:

[0189]

[0190] Among them, Q B_Ca K represents the rated capacity of the vehicle's power battery system. B_Ca Prioritize the rated capacity of the vehicle's power battery system.

[0191] A higher rated total voltage of the battery system indirectly reflects a higher power demand, and therefore a higher charging priority. Using 400V as a baseline, every 40V change corresponds to a 1-level change in the priority of the vehicle's power battery system's rated total voltage, expressed by the formula:

[0192]

[0193] Among them, U B_Total K represents the rated total voltage of the vehicle's power battery system. B_U Priority is assigned to the rated total voltage of the vehicle's power battery system.

[0194] Initial State of Charge (SOC) of the vehicle's power battery Init The corresponding priority K SOC_Init The calculation process is as follows:

[0195] The initial state of charge (SOC) affects battery life, charging mode, charging power limit, and the urgency of the user's charging needs. This can be expressed by the formula:

[0196] K SOC_Init =Function(SOC) Init );

[0197] Among them, SOC Init Initial state of charge of the vehicle's power battery, K SOC_Init The priority corresponding to the initial state of charge of the vehicle's power battery.

[0198] SOC Init With K SOC_Init The correspondence is detailed in the table below.

[0199] Initial state of charge and its priority

[0200] Initial state of charge and its priority number

[0201]

[0202]

[0203] The priority K corresponding to the current battery voltage of the vehicle's power battery U_RealTime The determination process is as follows:

[0204] The ratio of the current battery voltage to the battery's rated total voltage (Ratio) is calibrated using the OCV-SOC curve to obtain the priority parameter, which reflects the impact of charging voltage on the health of the power battery.

[0205] ① When 0.967 ≤ Ratio, K U_RealTime =15;

[0206] ② When 0.960 ≤ Ratio < 0.967, K U_RealTime =2;

[0207] ③ When Ratio < 0.960, K U_RealTime = -5.

[0208] Incremental priority ΔK Pri Based on relevant parameters of the charging stage on the CAN link, it reflects the impact of factors such as the current charging progress of the power battery, the current state of charge, the cumulative charging time, and the estimated remaining charging time on the charging priority.

[0209] Various charging modes K CM The corresponding priority values ​​are as follows:

[0210] Based on the charging characteristics of lithium-ion batteries, namely the charging characteristics of constant current followed by constant voltage, the constant current stage has high power and long duration, and should be prioritized.

[0211] Therefore, in constant current charging mode, K CM =15; In constant voltage charging mode, K CM =5.

[0212] Current state of charge (SOC) RealTime The corresponding priority K SOC_RealTime The calculation process is as follows:

[0213] The difference in real-time SOC during charging affects factors such as charging progress, charging mode, and charging power distribution. The formula is expressed as follows:

[0214] K SOC_RealTime =Function(SOC) RealTime );

[0215] Among them, SOC RealTime K represents the current state of charge of the power battery. SOC_RealTimeThe priority corresponding to the current state of charge of the power battery.

[0216] K SOC_RealTime With SOC RealTime The correspondence is detailed in the table below.

[0217] Real-time state of charge and its priority

[0218] Real-time state of charge and its priority number

[0219]

[0220]

[0221] Remaining charging time T Remaining This reflects the remaining charging power and capacity. Assuming a 50Ah, 90kW charge takes one hour to fully charge, fast charging to 80% takes 35 minutes, leaving 25 minutes with low priority. Assuming an average charging time of 2 hours, if the remaining charging time is less than 39 minutes, the priority is 0; if it's less than 10 minutes, the estimated remaining charging time corresponds to a priority of -3.

[0222] The corresponding priority calculation formula is expressed as:

[0223]

[0224] Among them, T Remaining Estimate remaining charging time; K T_Remaining Priority for remaining charging time

[0225] This displays the time already spent waiting or charging. The first 15 minutes are disregarded; thereafter, the priority of the accumulated charging time increases by 5 for every 20 minutes.

[0226] The priority calculation formula in this scenario is:

[0227]

[0228] Among them, T Total For the cumulative charging time, K T_Total Priority is assigned based on cumulative charging time. This is the floor symbol.

[0229] The priority K corresponding to the current charging state factor CS The possible values ​​are as follows:

[0230] Current charging state factor K CS This measures the health status of the power battery pack during the charging and regulation process, categorizing it into good and sub-healthy states. In a good state, K...CS_G =1.0.

[0231] There are three situations when one is in a sub-healthy state:

[0232] 1) When SOC is too high / too low, K CS_SOC =0.5, otherwise K CS_SOC =1.0;

[0233] Excessively high or low SOC poses a significant threat to the health and safety of power batteries, thus requiring a timely and substantial reduction in charging current.

[0234] 2) When the battery is charging with overcurrent, K CS_OverCur =0.5, otherwise, K CS_OverCur =1.0;

[0235] Overcurrent during battery charging can pose a significant safety threat to related equipment, so it is necessary to reduce the charging current significantly and promptly.

[0236] 3) When the battery temperature is too high, K CS_OverTemp =0.9, otherwise K CS_OverTemp =1.0.

[0237] Excessive battery temperature affects the safety of the power battery, so it is necessary to reduce the priority and thus reduce the charging current. However, considering that the response to temperature reduction is slow, the adjustment coefficient should not be too low, otherwise overshoot will have a significant impact on other priority factors.

[0238] The expression for the current charging state factor is:

[0239] K CS =K CS_G ·K CS_SOC ·K CS_OverCur ·K CS_OverTemp

[0240] The calculation module is specifically used for:

[0241] During the charging handshake and charging parameter configuration phases, the power controller PCM only listens to and records the parameter information of the charging pile and power battery on the CAN communication link, and saves it in the flash memory of the PCM for subsequent parameter calculation. It does not control the communication parameters.

[0242] During the charging phase, the power controller listens for and saves BCL / BCS / CCS / BSM messages on the CAN link, and sends data to other power controllers in sequence via the power control bus, as shown in the table below.

[0243] Sorting out interaction information on the power control bus

[0244] Sorting out the information exchanged on the power control bus

[0245]

[0246] First, the charging priority N of each component is calculated in real time. Pri_i By using the calculation formula and substituting the relevant parameters, you can calculate your own charging priority N. Pri_i .

[0247] Then, calculate and save the real-time requested power of this power controller.

[0248] P Req_i =U Req_i ·I Req_i ;

[0249] Finally, [N] Adder ,P Req_i N Pri_i This set of parameters is sent to the power control bus according to the timing sequence, and receives real-time parameters from other power controllers on the power control bus. [N] Adder ,P Req_i N Pri_i Save the data for later use in power regulation calculations.

[0250] After each power controller sends and receives data sequentially according to the timing described above, the subsequent processing timing is as follows:

[0251] 1) Calculate the real-time maximum total power P MAX_Total :

[0252]

[0253] 2) Calculate the remaining available power P RemainAvailb :

[0254] P RemainAvailb =P Transf -P MAX_Total ;

[0255] The control module is specifically used for:

[0256] 1) When the priority of any charging pile is less than the median of the priorities of all charging piles, the power controller of that charging pile will reduce its output power to the preset minimum output power.

[0257] 2) For charging piles with a priority greater than the median priority of all charging piles, increase their output power by the allowed preset value based on the existing value.

[0258] First, adjust the output power of charging piles with priorities lower than the median to the lowest level. Then, increase the output power of controllers with higher priorities in sequence. If there is still available power, continue to increase the power as described in step 2) until the preset total power limit is reached.

[0259] Example 3:

[0260] The following is a detailed introduction to a power regulation method for charging pile groups:

[0261] like Figure 4 As shown, the structure of the charging pile group during operation can be seen, such as... Figure 5 The system architecture of the charging information control network shown can be seen to be that the power controller adjusts the output power of the charging pile connected to it, and multiple power controllers exchange power information through the power control bus to flexibly adjust and allocate the available power.

[0262] The charging power regulation process is as follows:

[0263] When the target power is achieved, the control process can be divided into the following steps:

[0264] The first step involves the electric vehicle connecting to the charging pile via the charging gun. The power controller (PCM) on the charging gun communication link monitors the interaction data between the charging pile and the BMS on the CAN communication link. This includes rated parameters such as battery pack capacity, maximum charging voltage, maximum charging current, minimum output voltage, and minimum output current, as well as real-time parameters such as voltage demand, current demand, charging mode, current state of charge, estimated remaining charging time, voltage output value, current output value, and cumulative charging time.

[0265] The second step is to report the real-time data of this power controller, including three parameters: power controller address, required power, and total priority. It also receives real-time parameters from other power controllers in sequence, including the power controller address, required power, and priority of each other power controller.

[0266] The third step involves each power controller calculating the real-time total power and the remaining available total power, and adjusting the output power of its respective charging station according to priority parameters.

[0267] The charging control system modes at different times are described as follows:

[0268] When the power distribution transformer is connected to the power supply, the charging power controller powers on and enters standby mode:

[0269] 1) The charging regulation process during off-peak hours is as follows:

[0270] When a small number of electric vehicles are connected to charging stations, the sum of the rated power of the charging stations is less than the transformer's active power warning value of 0.75 s. Grid At this time, each power controller only monitors and exchanges real-time parameters and calculates parameters such as remaining available power, without adjusting the charging power.

[0271] 2) The charging regulation process from off-peak to peak hours is as follows:

[0272] With the addition of charging vehicles, the total real-time charging power of the charging pile cluster will gradually approach the transformer's active power warning value of 0.75 s. Grid During the process of regulation, if the time limit is not exceeded, it will still be handled according to 1).

[0273] When the total real-time charging power of the charging pile group is equal to or greater than the transformer active power warning value of 0.75·S Grid And less than the transformer's rated active power of 0.9·S Grid At the same time, each charging power controller adjusts the charging power of each electric vehicle connected to the charging pile according to its priority:

[0274] ① When the priority of any charging pile is less than the median of the priorities of all charging piles, the power controller of that charging pile will reduce its output power to the preset minimum output power.

[0275] ② For charging piles with a priority greater than the median priority of all charging piles, increase their output power by the allowed preset value based on the existing value.

[0276] Following the rules above, first adjust the output power of charging piles with priorities lower than the median to the lowest level, then sequentially increase the output power of controllers with higher priorities. If there is still usable power, continue to increase the power using method ② until the preset total power limit of 0.9·S is reached. Grid .

[0277] 3) The charging control process during peak hours is as follows:

[0278] When the total real-time charging power of the charging pile group is equal to or greater than the transformer active power warning value of 0.75·S Grid However, this is less than the transformer's rated active power of 0.9·S. Grid At this time, the charging power is adjusted according to the charging priority. The output power of the priority is reduced when the priority is lower than the median priority value, and the output power of the priority is increased when the priority is higher than the median priority value.

[0279] At this time, the total active power output of the transformer is close to full load operation and dynamically stable, but the active power increases and decreases among the charging piles due to different priorities.

[0280] 4) The charging control process from busy hours to idle hours is as follows:

[0281] As charging progresses and the peak charging period ends, when the charging power drops below the charging power warning value, the charging power regulation switches from power limiting mode to power autonomous control mode.

[0282] Example 4:

[0283] Based on the same inventive concept, this invention also provides a computer device, which includes a processor and a memory. The memory stores a computer program, which includes program instructions. The processor executes the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the computer storage medium to achieve the corresponding method flow or corresponding function, thereby realizing the steps of the general design tower main technical condition combination optimization method in the above embodiments.

[0284] Example 5:

[0285] Based on the same inventive concept, this invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device used to store programs and data. It is understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and extended storage media supported by the computer device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk storage device. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method for optimizing the combination of main technical conditions for general-purpose tower design in the above embodiments.

[0286] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0287] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0288] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0289] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0290] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0291] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. A method for power regulation of a charging pile group, characterized in that... ,include: Based on the parameters of the interaction between each charging pile and the building equipment management system, the priority of each charging pile is determined using a pre-defined priority algorithm. The parameters that each charging pile interacts with the building equipment management system include: the capacity of the distribution transformer and the rated active power value of the distribution transformer. Based on the parameters obtained from the interaction between each charging pile and the building equipment management system, the total power of the charging pile group and the remaining available power of the charging pile group are calculated. When the total power of the charging pile group enters the pre-set power adjustment buffer zone, the output power of each charging pile is adjusted based on the priority of each charging pile and the remaining available power of the charging pile group. The priority algorithm is based on the electric vehicle's charging speed factor, basic priority, incremental priority, and charging state factor. The priority of each charging pile is determined using a pre-defined priority algorithm based on parameters obtained from the interaction between each charging pile and the building equipment management system. This includes: The charging speed factor of the electric vehicle's power battery is determined based on the charging mode. The basic priority value of the electric vehicle power battery is determined based on the priority corresponding to the rated capacity, the priority corresponding to the rated total voltage, the priority corresponding to the initial state of charge, and the priority corresponding to the current battery voltage. The incremental priority value of the electric vehicle power battery is determined based on the priority corresponding to the charging mode of the electric vehicle power battery, the priority corresponding to the current state of charge, the priority corresponding to the remaining charging time, and the priority corresponding to the cumulative charging time. The charging state factor of the electric vehicle power battery is determined based on the current state of charge, charging current, and temperature of the electric vehicle power battery. The priority of a charging station is obtained by multiplying the sum of the basic priority value and the incremental priority value of the electric vehicle power battery with the charging speed factor and the charging state factor of the electric vehicle power battery. The basic priority value is calculated using the following formula: ； In the formula, Basic priority value; This is the priority value corresponding to the rated capacity of the vehicle's power battery system. The priority value corresponding to the rated total voltage of the vehicle's power battery system; This is the priority value corresponding to the initial state of charge of the vehicle's power battery. This is the priority value corresponding to the current battery voltage of the vehicle's power battery. Among them, the charging speed factor This is used to indicate the user's choice of charging speed, and is input through the charging station interface. It is divided into fast charging mode. and normal charging mode ; Incremental Priority Parameters used to characterize the charging stage based on the CAN link include: the current charging progress of the power battery, the current state of charge, the cumulative charging time, and the impact of factors such as the estimated remaining charging time on the charging priority.

2. The method as described in claim 1, characterized in that, The setting of the power adjustment buffer includes: Active power warning values ​​are determined based on the general standard values ​​of distribution transformer capacity; The difference between the rated active power value of the distribution transformer and the active power warning value is determined as the power adjustment buffer zone.

3. The method as described in claim 2, characterized in that, The active power warning value is calculated using the following formula: ； In the formula, λ is the early warning factor when entering the power regulation mode; This is the active power warning value; This refers to the capacity of the distribution transformer.

4. The method as described in claim 2, characterized in that, The parameters that each charging pile interacts with the building equipment management system also include one or more of the following: charging mode, current state of charge, remaining charging time, cumulative charging time, rated capacity, rated total voltage, initial state of charge, current battery voltage, charging current status, and temperature status.

5. The method as described in claim 1, characterized in that, The calculation of the total power and remaining available power of the charging pile group based on the parameters exchanged between each charging pile and the building equipment management system includes: The power of each charging pile is determined based on the parameters obtained from the interaction between each charging pile and the building equipment management system, and the total power of the charging pile group is obtained by summing the power of each charging pile. The remaining usable power of the charging pile group is obtained by subtracting the rated active power value of the distribution transformer from the total power of the charging pile group.

6. The method as described in claim 1, characterized in that, The method of adjusting the output power of each charging pile based on its priority and the remaining available power of the charging pile group includes: The power adjustment threshold is determined based on the priority of all charging stations; Among all charging piles, the output power of charging piles with a priority lower than the power adjustment threshold will be reduced to the lowest output power; the output power of charging piles with a priority greater than or equal to the power adjustment threshold will be increased. When the total output power of all charging piles after adjustment is less than the total power limit, the charging piles with a priority lower than the power adjustment threshold will be adjusted up in order of priority until the total output power after adjustment is equal to the total power limit.

7. The method as described in claim 1, characterized in that, The calculation of the total power and remaining available power of the charging pile group based on the parameters exchanged between each charging pile and the building equipment management system also includes: When the total power of all charging piles does not enter the pre-set power adjustment buffer zone, each charging pile outputs power based on the autonomous control mode.

8. A power regulation system for a charging pile group, used to implement the method as described in claim 1, characterized in that... ,include: The priority determination module is used to determine the priority of each charging pile based on the parameters exchanged between each charging pile and the building equipment management system, using a pre-defined priority algorithm. The calculation module is used to calculate the total power of the charging pile group and the remaining available power of the charging pile group based on the parameters exchanged between each charging pile and the building equipment management system. The control module is used to adjust the output power of each charging pile based on the priority of each charging pile and the remaining available power of the charging pile group when the total power of the charging pile group enters the preset power adjustment buffer. The priority algorithm is based on the electric vehicle's charging speed factor, basic priority, incremental priority, and charging state factor.

9. A computer device, characterized in that, include: One or more processors; The processor is used to store one or more programs; When the one or more programs are executed by the one or more processors, a power regulation method for a charging pile group as described in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that, It contains a computer program, which, when executed, implements a power regulation method for a charging pile group as described in any one of claims 1 to 7.

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