Real-time power distribution method of electric vehicle charging station and terminal

Abstract

The invention provides a real-time power distribution method of an electric vehicle charging station and a terminal. The current maximum allowable power of the charging station is calculated in real time; acquiring the required current and the vehicle side voltage of the charged vehicles, and calculating the required power of each charged vehicle and the total required power of all the charged vehicles; calculating the power limit of each charging vehicle based on the maximum allowable power, the demand power and the total demand power, and taking the power limit as the power upper limit of the charging pile for charging the corresponding vehicle; the current SOC, the total battery electric quantity and the charging starting time of the charged vehicles are obtained in real time, and the charging ending time of each charged vehicle is calculated in combination with the current charging power of the corresponding charging pile; and grouping the charged vehicles according to the sequence of the charging ending time, and increasing or decreasing the power quota of the corresponding proportion to the current charging power of the charging pile corresponding to each charged vehicle in each group. According to the invention, the circulation speed of vehicles in the charging station can be improved while the output power does not exceed the maximum allowable power of the charging station.

Description

[0001] This divisional application is based on the mother patent of an invention patent with an application date of May 28, 2024, an application number of 2024106711405, and a title of "A Power Allocation Method and Terminal for a Charging Station". Technical Field

[0002] The present invention relates to the field of new energy technologies, and particularly to a real-time power allocation method and terminal for an electric vehicle charging station. Background Art

[0003] With the popularization of new energy vehicles, new energy vehicle charging stations have become the focus of the development of the automotive industry and the energy industry.

[0004] When a charging station charges a new energy vehicle, it is necessary to ensure that the output real-time power does not exceed the maximum allowable power of the charging station. Many charging stations are equipped with photovoltaic and energy storage modules. Photovoltaic can obtain additional free energy from good sunlight conditions. Energy storage can not only reduce the impact on the power grid during the peak vehicle charging period, reduce the cost of power grid wire pulling, but also improve the operation efficiency by adjusting the peak-valley electricity price difference. Among them, the maximum allowable power is a dynamically changing value in real time. Usually, the efficiency of power conversion equipment can reach more than 90%, and we can approximately consider that the maximum allowable power is equal to the maximum power of the power grid + photovoltaic output power + energy storage output power. When the energy storage output power > 0, it means that the energy storage module discharges; when the energy storage output power < 0, it means that the energy storage module charges. Its magnitude is adjusted by the EMS energy management system according to various factors such as the energy storage SOC (state of charge), sunlight conditions, peak-valley electricity price, and vehicle charging power demand. Therefore, the maximum allowable power changes in real time, and the total output power of the charging piles cannot exceed this value. At the same time, a charging station may have one or more distribution cabinets, and the distribution cabinets contain PCS inverters, DCDC DC converters, photovoltaic modules, energy storage modules, etc. Each distribution cabinet will have multiple charging pile terminals, and each charging pile will be configured with one or more DCDC DC converters. The energy conversion efficiency of the DCDC DC converter is usually more than 90% but less than 99%. During peak periods, the power demands of all charging terminals (charging piles) in the charging station may exceed the maximum allowable power. At this time, the charging station cannot fully meet the power requests of each vehicle, and it is necessary to limit and allocate the output power of the charging piles to avoid overload.

[0005] The prior art usually sets a power upper limit value for the charging piles that are currently charging according to the number of charging piles that are currently charging (set as Nc). This upper limit value is KPmax / Nc (K is a proportionality coefficient, that is, the conversion efficiency of the DCDC DC converter, usually 0.90 < K < 0.99, and Pmax is the maximum allowable power). Usually, there are the following disadvantages:

[0006] 1. It is easy to waste charging capacity and increase the average charging time:

[0007] Although the existing technology can limit the output power within the allowable range, the power distribution is not sufficient, resulting in a waste of charging capacity. For example, assuming that the current Pmax is 160KW, there are two charging piles being charged, that is, Nc is 2, and the two charging piles correspond to car A and car B. Assuming that the efficiency K of the DCDC DC converter is 0.9, the limited power value KPmax / Nc allocated to each pile is equal to 72KW. Assuming that the power demand of car A is 100KW and the power demand of car B is 40KW, since the power limit allocated to each charging pile is 72KW, the charging power of A is limited and can only be output at 72KW; while car B can be charged at 40KW according to the actual demand. However, the current charging station can actually fully meet the actual power demand of car A and car B. The actual power consumption of the two cars is (PA+PB) / K=155KW, which is less than Pmax of 160KW.

[0008] 2. During the peak charging period, the speed of vehicles entering and leaving the charging station is uneven, and the waiting time is long:

[0009] During the peak charging period, all charging piles are working, and new vehicles have to wait in line. Since there are many working charging piles, that is, Nc is relatively large, according to the formula KPmax / Nc, the limited power value allocated to each charging pile becomes smaller. For vehicles with relatively large power requirements, the charging time is obviously longer, which leads to a longer queue time for vehicles that are charged later; and when there are multiple charging vehicles with similar remaining charging time, the time for these vehicles to leave the site will also be similar. When these vehicles leave the site, multiple charging piles will be vacated at once. There may be uneven departure rates, with either long queues or a situation where the piles are vacated quickly. Summary of the invention

[0010] The technical problem to be solved by the present invention is to provide a real-time power distribution method and terminal for an electric vehicle charging station, which effectively improves the power utilization rate of the charging station, and increases the circulation speed of vehicles in the charging station while ensuring that the output power does not exceed the maximum allowable power of the charging station.

[0011] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0012] A real-time power distribution method for an electric vehicle charging station comprises the following steps:

[0013] S1. Calculate the current maximum allowable power of the charging station in real time;

[0014] S12: Preset a safe power value P for each charging pile min, and when the vehicle is just connected to the charging pile for charging, the charging pile is controlled to charge at the safety power value P min The vehicle is charged and reports the required current to the EMS.

[0015] S2. Obtain the demand current reported by the charging vehicle and the vehicle-side voltage measured by the DC meter of the charging pile, and calculate the demand power of each charging vehicle and the total demand power of all charging vehicles;

[0016] S3. Calculate the power quota of each charging vehicle based on the maximum allowed power, the required power of each charging vehicle and the required total power of all charging vehicles, and issue the power quota to the corresponding charging pile as the charging power upper limit of the corresponding vehicle;

[0017] S4. Real-time acquisition of the current SOC, total battery power reported by the BMS of the charging vehicle and the charging start time reported by the charging pile, and calculation of the charging end time of each charging vehicle in combination with the current charging power of the corresponding charging pile;

[0018] The step S4 is specifically as follows:

[0019] The remaining charging time T of each vehicle can be estimated by combining the real-time SOC and total battery power E of the charging vehicle with the real-time charging power of the charging pile. left , and then according to the charging start time T of each charging vehicle start , estimate the charging end time T of each charging vehicle end ;

[0020] The remaining charging time is calculated as follows:

[0021]

[0022] Among them, P cur is the current charging power of the corresponding charging pile, and the current charging power P of each charging pile cur Less than or equal to the corresponding power quota P lmt ;

[0023] S5. Group the charging vehicles according to the order of the charging end time, and add or subtract a corresponding proportion of the power quota to the current charging power of the charging pile corresponding to each charging vehicle in each group according to the order of the grouping;

[0024] S6. Repeat step S4 at first intervals.

[0025] In order to solve the above technical problems, another technical solution adopted by the present invention is:

[0026] A real-time power distribution terminal for an electric vehicle charging station comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in the real-time power distribution method for an electric vehicle charging station are implemented.

[0027] The beneficial effects of the present invention are as follows: a real-time power allocation method and terminal for an electric vehicle charging station are provided, which calculates the power demand of each charging vehicle by obtaining the demand current and vehicle-side voltage of each charging vehicle, and calculates the maximum power quota that can be allocated to each charging vehicle according to the demand ratio based on the demand power and the total power demand of all charging vehicles, combined with the maximum allowable power of the charging station, so that the charging pile can output the charging power according to the charging quota to charge the vehicle, that is, a small power limit quota is given to vehicles with small power demand, and conversely, a high power limit quota is given to vehicles with high power demand, effectively avoiding the problem of charging capacity waste; at the same time, in order to avoid uneven departure speeds, the charging end time of each charging vehicle is estimated by obtaining the real-time SOC, total battery power and charging start time of the charging vehicle, combined with the charging power allocated by the charging pile in real time, that is, Departure time, so that according to the estimated departure time, the power quota can be appropriately allocated to the vehicles with similar departure time and added to the charging power of the corresponding charging pile, so as to effectively control the departure speed of the vehicles, reduce the length of the queue, and improve the user experience; when the vehicle is just connected to the charging pile, the vehicle is charged by the preset safety power value, so that the vehicle can start charging in time and reserve a certain time for the vehicle to report the required voltage and current to the EMS so as to subsequently determine the charging power upper limit of the charging pile for the vehicle; at the same time, the remaining charging time of each charging vehicle can be estimated by combining the real-time SOC and total battery power of the charging vehicle with the real-time charging power of the charging pile, and then the charging end time of each charging vehicle can be estimated according to the charging start time of each charging vehicle. Since the real-time charging power of the charging pile changes in real time, that is, the current charging power P cur It changes in real time, but its change will not exceed the corresponding power quota P lmt . BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is an overall flow chart of a real-time power distribution method for an electric vehicle charging station according to an embodiment of the present invention;

[0029] Figure 2 The present invention is a schematic diagram of the structure of a real-time power distribution terminal of an electric vehicle charging station according to an embodiment of the present invention.

[0030] Description of labels:

[0031] 1. A real-time power distribution terminal for an electric vehicle charging station; 2. A memory; 3. A processor. DETAILED DESCRIPTION

[0032] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0033] Please refer to Figure 1 , a real-time power distribution method for an electric vehicle charging station, comprising the steps of:

[0034] S1. Calculate the current maximum allowable power of the charging station in real time;

[0035] S2. Obtain the demand current reported by the charging vehicle and the vehicle-side voltage measured by the DC meter of the charging pile, and calculate the demand power of each charging vehicle and the total demand power of all charging vehicles;

[0036] S3. Calculate the power quota of each charging vehicle based on the maximum allowed power, the required power of each charging vehicle and the required total power of all charging vehicles, and issue the power quota to the corresponding charging pile as the charging power upper limit of the corresponding vehicle;

[0037] S4. Real-time acquisition of the current SOC, total battery power reported by the BMS of the charging vehicle and the charging start time reported by the charging pile, and calculation of the charging end time of each charging vehicle in combination with the current charging power of the corresponding charging pile;

[0038] S5. Group the charging vehicles according to the chronological order of the charging end time, and add or subtract a corresponding proportion of the power quota to the current charging power of the charging pile corresponding to each charging vehicle in each group according to the chronological order of the groups.

[0039] From the above description, it can be seen that the beneficial effects of the present invention are: providing a real-time power allocation method for an electric vehicle charging station, calculating the required power of each charging vehicle by obtaining the required current and vehicle-side voltage of each charging vehicle, and calculating the maximum power quota that can be allocated to each charging vehicle according to the demand ratio based on the required power and the total power required by all charging vehicles, combined with the maximum allowable power of the charging station, and then the charging pile can output the charging power for the vehicle according to the charging quota, that is, a small power limit quota is given to a vehicle with a small power demand, and conversely, a high power limit quota is given to a vehicle with a high power demand, effectively avoiding the problem of charging capacity waste; at the same time, in order to avoid uneven departure speed, the real-time SOC, total battery power and charging start time of the charging vehicle are obtained, combined with the charging power allocated by the charging pile in real time, and the charging end time of each charging vehicle, that is, the departure time, can be estimated, so that according to the estimated departure time, the power quota can be appropriately allocated to the vehicles with close departure time and added to the charging power of the corresponding charging pile, effectively controlling the departure speed of the vehicle, reducing the length of the queue, and improving the user experience.

[0040] Furthermore, before step S1, the method further includes:

[0041] S0. The DCDC conversion efficiency of each charging pile is regarded as 1.

[0042] From the above description, it can be seen that considering the DCDC conversion efficiency of each charging pile as 1 can effectively simplify subsequent calculations and analysis.

[0043] Furthermore, the steps S1 and S2 further include the following steps:

[0044] S12: Preset a safe power value P for each charging pile min , and when the vehicle is just connected to the charging pile for charging, the charging pile is controlled to charge at the safety power value P min Charge the vehicle.

[0045] From the above description, it can be seen that when the vehicle is just connected to the charging pile, the vehicle is charged using the preset safety power value. While the vehicle starts charging in time, a certain amount of time can be reserved for the vehicle to report the required voltage and current to the EMS so that the charging pile can be determined to be the charging power upper limit of the vehicle.

[0046] Furthermore, the step S2 is specifically as follows:

[0047] S21. Obtain the demand current I reported by each charging vehicle when it is connected to the charging pile for charging. req and the vehicle side voltage U measured by the DC meter of the charging pile car , calculate the required power P of each charging vehicle req =Ireq U car ;

[0048] S22, the required power P of all charging vehicles req The total power required is P ra .

[0049] From the above description, it can be seen that the power requirement of each charging vehicle and the total power requirement of all charging vehicles can be quickly calculated according to the calculation formula of power and voltage and current.

[0050] Furthermore, the step S3 is specifically as follows:

[0051] Based on the maximum allowable power P max , the required power P req and the total power required P ra Calculate the power quota P of each charging vehicle lmt :

[0052]

[0053] The power quota P lmt It is sent to the corresponding charging pile as the charging power upper limit of the corresponding vehicle.

[0054] From the above description, it can be seen that the power quota of each charging vehicle can be calculated based on the proportion of the required power to the total required power combined with the maximum allowable power, that is, the maximum charging power that the charging pile can reach during the charging process. After obtaining the power quota, the charging station's charging power can be allocated to each charging vehicle according to the power quota limit. Vehicles with large demands are allocated large power, and vehicles with small demands are allocated small power. There is no need for average distribution as in the traditional way, thereby effectively avoiding the waste of charging capacity.

[0055] Furthermore, the step S4 is specifically as follows:

[0056] S41. Obtain the current SOC and total battery capacity E reported by the BMS of the charging vehicle in real time, and calculate the remaining charging time T of the charging vehicle. left :

[0057]

[0058] Among them, P cur is the current charging power of the corresponding charging pile, and the current charging power P of each charging pile cur Less than or equal to the corresponding power quota P lmt ;

[0059] S42, real-time acquisition of the charging start time T of the charging vehicle reported by each charging pilestart , calculate the charging end time T of the charging vehicle end :

[0060] T end =T start +T left (3);

[0061] From the above description, it can be seen that the remaining charging time of each vehicle can be estimated by combining the real-time SOC and total battery power of the charging vehicle with the real-time charging power of the charging pile. Then, according to the charging start time of each vehicle, the charging end time of each vehicle can be estimated. Since the real-time charging power of the charging pile changes in real time, that is, the current charging power P cur It changes in real time, but its change will not exceed the corresponding power quota P lmt .

[0062] Furthermore, the step S5 is specifically as follows:

[0063] S51, according to the charging end time T end The charging end time T is sorted and grouped before and after, and multiple groups of charging end time T are obtained by statistics. end The interval is in the first interval T group The vehicle is being charged;

[0064] S52: Within the same group, according to the charging start time T start The first charging vehicle to arrive in sequence increases the power quota P of the current charging power of its corresponding charging pile. add , where the first interval T group satisfy:

[0065]

[0066] Then the power quota P is derived add :

[0067]

[0068] At the same time, it should be ensured that (P cur +P add ) <P req , otherwise press P add =P req -P cur Calculate, and P add is less than a first threshold;

[0069] S53, within the same group, according to the charging start time T start The latest charging vehicle is selected in sequence, and the current charging power of the corresponding charging pile is reduced by the power quota Padd ;

[0070] S54, repeating steps S52 to S53 until the current charging power of the corresponding charging pile is increased or decreased for each charging vehicle in each group of charging vehicles, if the current charging power of the corresponding charging pile of other charging vehicles in the same group is less than P add , the current charging power is maintained without any increase or decrease operation.

[0071] From the above description, it can be seen that in order to avoid uneven departure speeds, it is necessary to follow the estimated charging end time of each charging vehicle, that is, the departure time. If the departure times are close, the charging power quota for the charging vehicle that arrived first should be appropriately increased, and the power quota for the charging vehicle that arrived later should be appropriately reduced. In this way, the speed of vehicle departure can be controlled in an orderly manner. Those who arrive first can leave faster to make room for those in line, reducing the length of the queue and improving user experience.

[0072] Furthermore, the first interval T group The power consumption is 3 to 5 minutes, and the first threshold is 20 to 30 KW.

[0073] From the above description, it can be seen that the first interval and the first threshold are limited in range to ensure the rationality of grouping vehicles whose departure time is close to that of the charging vehicles and to avoid the increase or decrease of the power quota affecting the owner experience of the vehicles that arrive at the charging site later.

[0074] Furthermore, after step S5, the following steps are further included:

[0075] S6. Repeat step S4 at a first time interval, wherein the first time interval is 1 to 2 minutes.

[0076] From the above description, it can be seen that since the power demand of the charging vehicle will change, it is necessary to periodically adjust the increase or decrease quota to ensure the balanced continuity of the vehicle's entry and exit speed.

[0077] Please refer to Figure 2 A real-time power distribution terminal for an electric vehicle charging station includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in the above-mentioned real-time power distribution method for an electric vehicle charging station are implemented.

[0078] From the above description, it can be seen that the beneficial effects of the present invention are: based on the same technical concept, in conjunction with the above-mentioned real-time power allocation method of an electric vehicle charging station, a real-time power allocation terminal for an electric vehicle charging station is provided, which calculates the required power of each charging vehicle by obtaining the required current and vehicle-side voltage of each charging vehicle, and calculates the maximum power quota that can be allocated to each charging vehicle according to the demand ratio based on the required power and the total power required by all charging vehicles, combined with the maximum allowable power of the charging station, so that the charging pile can output the charging power to charge the vehicle according to the charging quota, that is, it realizes the small power demand for the vehicle. Vehicles with small power limits are given, and vehicles with high power demands are given high power limits, effectively avoiding the problem of wasted charging capacity. At the same time, in order to avoid uneven departure speeds, the real-time SOC, total battery power and charging start time of the charging vehicles are obtained, combined with the charging power allocated by the charging pile in real time, to estimate the charging end time of each charging vehicle, that is, the departure time. In this way, according to the estimated departure time, power quotas can be appropriately allocated to vehicles with close departure times and added to the charging power of the corresponding charging piles, effectively controlling the departure speed of vehicles, reducing the length of queues, and improving user experience.

[0079] The present invention provides a real-time power distribution method and terminal for an electric vehicle charging station, which are mainly used in the scenario of reasonable power distribution for new energy vehicles in a charging station, and are specifically described below in conjunction with specific embodiments:

[0080] Please refer to Figure 1 , Embodiment 1 of the present invention is:

[0081] A real-time power allocation method for an electric vehicle charging station, such as Figure 1 As shown, the steps include:

[0082] S0. The DCDC conversion efficiency of each charging pile is regarded as 1, which effectively simplifies subsequent calculations and analysis.

[0083] S1. Calculate the current maximum allowable power of the charging station in real time.

[0084] S2. Obtain the demand current reported by the charging vehicle and the vehicle-side voltage measured by the DC meter of the charging pile, and calculate the demand power of each charging vehicle and the total demand power of all charging vehicles.

[0085] S3. Calculate the power quota of each charging vehicle based on the maximum allowed power, the required power of each charging vehicle and the total required power of all charging vehicles, and send the power quota to the corresponding charging pile as the charging power upper limit of the corresponding vehicle.

[0086] S4. Obtain in real time the current SOC and total battery power reported by the BMS of the charging vehicle and the charging start time reported by the charging pile, and calculate the charging end time of each charging vehicle in combination with the current charging power of the corresponding charging pile.

[0087] S5. Group the charging vehicles according to the order of charging end time, and increase or decrease the power quota of the corresponding proportion to the current charging power of the charging pile corresponding to each charging vehicle in each group according to the order of the groups.

[0088] That is, in this embodiment, the demand current and vehicle-side voltage of each charging vehicle are obtained to calculate the demand power of each charging vehicle, and the maximum power quota that can be allocated to each charging vehicle according to the demand ratio is calculated based on the demand power and the total demand power of all charging vehicles, combined with the maximum allowable power of the charging station, so that the charging pile can output the charging power to charge the vehicle according to the charging quota, that is, a small power limit quota is given to vehicles with small power demand, and conversely, a high power limit quota is given to vehicles with high power demand, effectively avoiding the problem of charging capacity waste; at the same time, in order to avoid uneven departure speed, the real-time SOC, total battery power and charging start time of the charging vehicle are obtained, combined with the charging power allocated by the charging pile in real time, and the charging end time of each charging vehicle, that is, the departure time, is estimated, so that according to the estimated departure time, the power quota can be appropriately allocated to the vehicles with close departure time and added to the charging power of the corresponding charging pile, effectively controlling the departure speed of the vehicle, reducing the length of the queue, and improving the user experience.

[0089] In this embodiment, after step S5, the following steps are further included:

[0090] S6. Repeat step S4 at a first time interval, wherein the first time interval can be set to 1 to 2 minutes.

[0091] That is, since the power demand of the charging vehicle will change, it is necessary to periodically adjust the increase or decrease quota to ensure the balanced and continuous speed of vehicles entering and leaving the site.

[0092] Embodiment 2 of the present invention is:

[0093] A real-time power distribution method for an electric vehicle charging station, based on the above-mentioned embodiment 1, in this embodiment, further includes the following steps between step S1 and step S2:

[0094] S12: Preset a safe power value P for each charging pile min , for example, 5KW, and when the vehicle is just connected to the charging pile for charging, the charging pile is controlled to charge at a safe power value P min Charge the vehicle.

[0095] That is, in this embodiment, when the vehicle is just connected to the charging pile, the vehicle is charged using a preset safety power value, so that the vehicle can start charging in time and a certain amount of time can be reserved for the vehicle to report the required voltage and current to the EMS so that the charging pile can be determined as the charging power upper limit for the vehicle.

[0096] In this embodiment, according to the national standard charging protocol of GB27930, each new energy vehicle will report the required voltage and current when charging at the station, that is, step S2 is specifically as follows:

[0097] S21. Obtain the demand current I reported by each charging vehicle when it is connected to the charging pile for charging. req and the vehicle side voltage U measured by the DC meter of the charging pile car , calculate the required power P of each charging vehicle req =I req U car .

[0098] S22, the power demand P for all vehicles being charged req The total power required is P ra .

[0099] That is, the power requirement of each charging vehicle and the total power requirement of all charging vehicles can be quickly calculated based on the calculation formula of power and voltage and current.

[0100] Then step S3 is specifically:

[0101] Based on the maximum permissible power P max , Required power P req and the total power required P ra Calculate the power quota P of each charging vehicle lmt :

[0102]

[0103] The power rating P lmt It is sent to the corresponding charging pile as the charging power upper limit of the corresponding vehicle.

[0104] That is, based on the proportion of the required power to the total required power and the maximum allowable power, the power quota of each charging vehicle can be calculated, that is, the maximum charging power that the charging pile can reach during the charging process. After obtaining the power quota, the charging station's charging power can be allocated to each charging vehicle according to the power quota limit. Vehicles with large demands are allocated large power, and vehicles with small demands are allocated small power. There is no need for average distribution as in the traditional way, thereby effectively avoiding the waste of charging capacity.

[0105] Meanwhile, step S4 is specifically as follows:

[0106] S41. Obtain the current SOC and total battery capacity E reported by the BMS of the charging vehicle in real time, and calculate the remaining charging time T of the charging vehicle. left :

[0107]

[0108] Among them, P cur is the current charging power of the corresponding charging pile, and the current charging power P of each charging pile cur Less than or equal to the corresponding power quota P lmt .

[0109] S42, real-time acquisition of the charging start time T of the charging vehicle reported by each charging pile start , calculate the charging end time T of the charging vehicle end :

[0110] T end =T start +T left (3);

[0111] That is, by combining the real-time SOC and total battery power of the charging vehicle with the real-time charging power of the charging pile, the remaining charging time of each charging vehicle can be estimated. Then, according to the charging start time of each charging vehicle, the charging end time of each charging vehicle can be estimated. Since the real-time charging power of the charging pile changes in real time, that is, the current charging power P cur It changes in real time, but its change will not exceed the corresponding power quota P lmt .

[0112] In this embodiment, step S5 is specifically as follows:

[0113] S51, according to the charging end time T end The charging end time T of multiple groups is obtained by sorting and grouping. end The interval is in the first interval T group The vehicle is being charged.

[0114] S52, within the same group, according to the charging start time T start The first charging vehicle to arrive in sequence increases the power quota P of the current charging power of its corresponding charging pile. add , where the first interval T group satisfy:

[0115]

[0116] According to formula (4), the power quota P can be derived: add :

[0117]

[0118] At the same time, it should be ensured that (P cur +P add )<P req , otherwise press P add =P req -P cur Calculate, and P add is smaller than the first threshold.

[0119] S53, within the same group, according to the charging start time T start The latest charging vehicle is selected in sequence, and the current charging power of its corresponding charging pile is reduced by the power quota P add .

[0120] S54, repeat steps S52 to S53 until the current charging power of the corresponding charging pile is increased or decreased for each charging vehicle in each group of charging vehicles. If the current charging power of the corresponding charging pile of other charging vehicles in the same group is less than P add , the current charging power will be kept unchanged without any increase or decrease.

[0121] That is, in this embodiment, in order to avoid uneven departure speeds, it is necessary to follow the estimated charging end time of each charging vehicle, that is, the departure time. If the departure times are close, the charging power quota of the charging vehicle that arrives first should be appropriately increased, and the power quota of the charging vehicle that arrives later should be appropriately reduced. In this way, the speed of vehicle departure can be controlled in an orderly manner. Those who arrive first can leave faster to make room for those in line, thereby reducing the length of the queue and improving the user experience.

[0122] In addition, in this embodiment, in order to ensure the rationality of grouping vehicles whose departure time is close to that of the charging vehicles and to avoid the increase or decrease of the power quota affecting the owner experience of the vehicles that arrive for charging later, it is necessary to limit the range of the first interval and the first threshold, where the first interval T group It can be limited to 3 to 5 minutes, and the first threshold can be limited to 20 to 30 kW. In other equivalent embodiments, the specific values ​​of the first interval and the first threshold can also be determined according to the actual working conditions of the charging station.

[0123] Please refer to Figure 2 , Embodiment 3 of the present invention is:

[0124] A real-time power distribution terminal 1 for an electric vehicle charging station includes a memory 2, a processor 3, and a computer program stored in the memory 2 and executable on the processor 3. When the processor 3 executes the computer program, the steps of the real-time power distribution method for an electric vehicle charging station in the first or second embodiment are completed. In this embodiment, the terminal is an EMS energy management system.

[0125] In summary, the real-time power distribution method and terminal of an electric vehicle charging station provided by the present invention have the following beneficial effects:

[0126] 1. It can effectively improve the power utilization rate of the charging station during the peak charging period. For vehicles with low power demand, a low power limit quota is allocated, and for vehicles with high power demand, a high power limit quota is allocated, so as to effectively avoid the problem of charging capacity waste;

[0127] 2. According to the principle of first come, first served, the charging power quota can be appropriately increased for those who arrive first, and the power quota can be appropriately reduced for those who arrive later. The speed of vehicles leaving the venue can be controlled in an orderly manner. Those who arrive first can leave the venue faster to make room for those in line, thus reducing the length of the queue and improving the user experience.

[0128] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A real-time power distribution method for an electric vehicle charging station, characterized in that: Includes steps: S1. Calculate the current maximum allowable power of the charging station in real time; S12: Preset a safe power value P for each charging pile min , and when the vehicle is just connected to the charging pile for charging, the charging pile is controlled to charge at the safety power value P min The vehicle is charged and reports the required current to the EMS. S2. Obtain the demand current reported by the charging vehicle and the vehicle-side voltage measured by the DC meter of the charging pile, and calculate the demand power of each charging vehicle and the total demand power of all charging vehicles; S3. Calculate the power quota of each charging vehicle based on the maximum allowed power, the required power of each charging vehicle and the required total power of all charging vehicles, and issue the power quota to the corresponding charging pile as the charging power upper limit of the corresponding vehicle; S4. Real-time acquisition of the current SOC, total battery power reported by the BMS of the charging vehicle and the charging start time reported by the charging pile, and calculation of the charging end time of each charging vehicle in combination with the current charging power of the corresponding charging pile; The step S4 is specifically as follows: The remaining charging time T of each vehicle can be estimated by combining the real-time SOC and total battery power E of the charging vehicle with the real-time charging power of the charging pile. left , and then according to the charging start time T of each charging vehicle start , estimate the charging end time T of each charging vehicle end ; The remaining charging time is calculated as follows: Among them, P cur is the current charging power of the corresponding charging pile, and the current charging power P of each charging pile cur Less than or equal to the corresponding power quota P lmt ; S5. Group the charging vehicles according to the order of the charging end time, and add or subtract a corresponding proportion of the power quota to the current charging power of the charging pile corresponding to each charging vehicle in each group according to the order of the grouping; S6. Repeat step S4 at first intervals.

2. The real-time power distribution method of an electric vehicle charging station according to claim 1, characterized in that: Before step S1, the method further includes: S0. The DCDC conversion efficiency of each charging pile is regarded as 1.

3. The real-time power distribution method of an electric vehicle charging station according to claim 1, characterized in that: The step S2 is specifically as follows: S21. Obtain the demand current I reported by each charging vehicle when it is connected to the charging pile for charging. req and the vehicle side voltage U measured by the DC meter of the charging pile car , calculate the required power P of each charging vehicle req =I req U car ; S22, the required power P of all charging vehicles req The total power required is P ra .

4. The real-time power distribution method of an electric vehicle charging station according to claim 3, characterized in that: The step S3 is specifically as follows: Based on the maximum allowable power P max , the required power P req and the total power required P ra Calculate the power quota P of each charging vehicle lmt : The power quota P lmt It is sent to the corresponding charging pile as the charging power upper limit of the corresponding vehicle.

5. The real-time power distribution method of an electric vehicle charging station according to claim 4, characterized in that: The step S5 is specifically as follows: S51, according to the charging end time T end The charging end time T is sorted and grouped before and after, and multiple groups of charging end time T are obtained by statistics. end The interval is in the first interval T group The vehicle is being charged; S52: Within the same group, according to the charging start time T start The first charging vehicle to arrive in sequence increases the power quota P of the current charging power of its corresponding charging pile. add , where the first interval T group satisfy: Then the power quota P is derived add : At the same time, it should be ensured that (P cur +P add )<P req , otherwise press P add =P req -P cur Calculate, and P add is less than a first threshold; S53, within the same group, according to the charging start time T start The latest charging vehicle is selected in sequence, and the current charging power of the corresponding charging pile is reduced by the power quota P add ; S54, repeating steps S52 to S53 until the current charging power of the corresponding charging pile is increased or decreased for each charging vehicle in each group of charging vehicles, if the current charging power of the corresponding charging pile of other charging vehicles in the same group is less than P add , the current charging power is maintained without any increase or decrease operation.

6. A real-time power distribution method for an electric vehicle charging station according to claim 5, characterized in that: The first interval T group The power consumption is 3 to 5 minutes, and the first threshold is 20 to 30 KW.

7. The real-time power distribution method of an electric vehicle charging station according to claim 1, characterized in that: The first time is 1 to 2 minutes.

8. A real-time power distribution terminal for an electric vehicle charging station, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps in the real-time power distribution method for an electric vehicle charging station as described in any one of claims 1 to 7 are implemented.

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