Charging station, and charging system and control method therefor

Abstract

The present application provides a charging station, and a charging system and a control method therefor. In the control method, at least one of a power grid system, an new energy power generation system, and an energy storage system is controlled to supply power to a charging system on the basis of the magnitude relationship between a total charging requirement and the maximum output power of the power grid system, the grid-connected power of the new energy power generation system and the maximum discharge power of an energy storage system, so that during a charging peak period, the charging system may no longer be powered only by the power grid system, but at least one of the new energy power generation system and the energy storage system and the power grid system may jointly supply power to the charging system, such that the total charging requirement during the charging peak period can be satisfied, and therefore, the control method can reduce the limited possibility of the charging power of a charging pile during the charging peak period.

Description

Charging station and charging system and control method thereof

[0001] The present application claims priority to the Chinese patent application No. CN202410477486.1, filed on April 19, 2024, and entitled "Charging station and charging system and control method thereof", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of power electronics, in particular to a charging station and a charging system and a control method thereof. BACKGROUND

[0003] In recent years, with the rapid expansion of the new energy vehicle market, the number of charging stations as supporting facilities for new energy vehicles has also been growing.

[0004] At present, due to the limitation of energy management requirements, the total charging power that the entire charging station can provide cannot be greater than the maximum output power of the power grid, so the charging station may not be able to meet the total charging demand of all charging vehicles in the charging station during the charging peak period, thereby increasing the charging waiting time of the vehicle owner during the charging peak period, and further leading to a low utilization rate of the charging station during the charging peak period.

[0005] At present, due to the fact that the power distribution of many charging stations in many regions at home and abroad cannot meet the maximum charging demand of each charging pile during the charging peak period, the charging power of the charging pile is easily limited during the charging peak period, thereby increasing the waiting time of the vehicle owner during the charging peak period, and also making the charging utilization rate of the charging station during the charging peak period low.

[0006] Therefore, how to reduce the possibility of limiting the charging power of the charging pile during the charging peak period is a technical problem to be solved.

[0007] SUMMARY

[0008] Therefore, the present application provides a charging station and a charging system and a control method thereof to reduce the possibility of limiting the charging power of the charging pile during the charging peak period.

[0009] To achieve the above-mentioned purpose, the embodiments of the present application provide the following technical solutions:

[0010] The first aspect of the present application provides a control method of a charging system, wherein the power supply end of the charging system is connected with a power grid system, a new energy power generation system and an energy storage system respectively; the control method of the charging system comprises:

[0011] obtaining the total charging demand of all charging vehicles connected with the charging system;

[0012] determine a target power supply system according to a size relationship among the total charging demand, a maximum output power of the grid system, a grid-connected power of the new energy power generation system, and a maximum discharging power of the energy storage system, wherein the target power supply system comprises at least one of the grid system, the new energy power generation system, and the energy storage system;

[0013] control the target power supply system to supply power to the charging system.

[0014] The second aspect of the present application provides a charging system, comprising an energy management system and at least two charging piles, wherein:

[0015] supply ends of all the charging piles are connected, and a connection point is used as a power supply end of the charging system and connected to a grid system, a new energy power generation system, and an energy storage system respectively;

[0016] The energy management system is in communication connection with the grid system, the new energy power generation system, the energy storage system, and each charging pile respectively.

[0017] The energy management system is configured to perform the control method of the charging system according to any one of the first aspect of the present application.

[0018] Optionally, the charging system further comprises an operation platform, wherein:

[0019] The energy management system is in communication connection with the operation platform, and the operation platform is in communication connection with each charging pile respectively.

[0020] The third aspect of the present application provides a charging station, comprising a grid system, a new energy power generation system, an energy storage system, and a charging system according to any one of the second aspect of the present application.

[0021] According to the above technical solution, the present application provides a control method of a charging system, wherein a power supply end of the charging system is connected to a grid system, a new energy power generation system, and an energy storage system respectively. In the control method, at least one of the grid system, the new energy power generation system, and the energy storage system is controlled to supply power to the charging system according to a size relationship among the total charging demand, a maximum output power of the grid system, a grid-connected power of the new energy power generation system, and a maximum discharging power of the energy storage system. Therefore, during a charging peak period, the charging system may be supplied with power by at least one of the new energy power generation system and the energy storage system as well as the grid system, instead of only by the grid system, so that the total charging demand during the charging peak period can be met, and thus the possibility of the charging power of the charging pile being limited during the charging peak period can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on the provided drawings.

[0023] Fig. 1 is a structural schematic diagram of an embodiment of the charging station provided by the present application;

[0024] Fig. 2 and Fig. 3 are flowcharts of two embodiments of the control method of the charging system provided by the present application, respectively;

[0025] Fig. 4 is a flowchart of an embodiment of S203 provided by the present application;

[0026] Fig. 5-Fig. 9 are flowcharts of five other embodiments of the control method of the charging system provided by the present application, respectively;

[0027] Fig. 10 is a structural schematic diagram of another embodiment of the charging station provided by the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of protection of the present application.

[0029] In the present application, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms “include”, “contain” or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitation, the element defined by the statement “including a…” does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0030] In order to reduce the possibility of the charging power of the charging pile being limited during the charging peak period, the present application provides a control method of a charging system.

[0031] The connection relationship of the charging system 40 is shown in FIG. 1. The power supply end of the charging system 40 is connected with the power grid system 10, the new energy power generation system 20 and the energy storage system 30 respectively, and each charging end of the charging system 40 is connected with each charging vehicle 50 respectively. The power grid system 10 comprises a power grid 11 and a transformer 12. The connection end of the power grid 11 is connected with the primary side of the transformer 12, and the secondary side of the transformer 12 is connected with the power supply end of the charging system 40.

[0032] The charging vehicle refers to a vehicle with charging demand.

[0033] Optionally, the new energy power generation system 20 can be a photovoltaic power generation system. In actual application, it includes but is not limited to this, which is not limited specifically here, and can be determined according to the specific situation, which is within the protection scope of the present application.

[0034] The specific process of the control method is shown in FIG. 2, which specifically comprises the following steps:

[0035] S110, acquiring the total charging demand of all charging vehicles connected with the charging system.

[0036] The total charging demand refers to the sum of the charging demands of all charging vehicles connected with the charging system.

[0037] S120, determining the target power supply system according to the size relationship among the total charging demand, the maximum output power of the power grid system, the grid-connected power of the new energy power generation system and the maximum discharge power of the energy storage system.

[0038] The maximum output power refers to the maximum power that the power grid system can provide. The grid-connected power refers to the power that the new energy power generation system can provide. The maximum discharge power refers to the maximum power that the energy storage system can provide.

[0039] The target power supply system comprises at least one of the power grid system, the new energy power generation system and the energy storage system.

[0040] It should be noted that S120 will be described in detail below, which will not be repeated here.

[0041] S130, controlling the target power supply system to supply power to the charging system.

[0042] In the control method, at least one of the grid system, the new energy power generation system and the energy storage system supplies power to the charging system according to the size relationship among the total charging demand, the maximum output power, the grid-connected power and the maximum discharging power. Therefore, during the charging peak period, the charging system may not be supplied with power only by the grid system, but may be supplied with power by at least one of the new energy power generation system and the energy storage system and the grid system, so that the total charging demand during the charging peak period can be met, and the possibility that the charging power of the charging pile is limited during the charging peak period can be reduced.

[0043] The application provides an embodiment of S120, and a specific process of the embodiment is shown in FIG. 3. The embodiment specifically comprises the following steps.

[0044] S201: determining whether the total charging demand is less than or equal to the grid-connected power.

[0045] In the case where the total charging demand is less than or equal to the grid-connected power, S202 is performed.

[0046] In the case where the total charging demand is less than or equal to the grid-connected power, S202 is performed.

[0047] S202: taking the new energy power generation system as a target power supply system.

[0048] It should be noted that in actual application, if the grid-connected power is greater than the total charging demand, the new energy power generation system can be further controlled to charge the energy storage system, and in addition, the new energy power generation system can be controlled to supply power to the grid system, that is, the new energy power generation system is controlled to feed back to the grid. Specifically, the new energy power generation system can be controlled to charge the energy storage system first, until the energy storage system is fully charged, and then continue to supply power to the grid system.

[0049] In this embodiment, since the power generation cost of the new energy power generation system is low, in the case where the new energy power generation system can meet the total charging demand, the new energy power generation system is used to supply power to the charging system, so that the charging cost of the charging system can be reduced, and the overall benefit of charging can be increased.

[0050] The above is only an embodiment of S120, and in actual application, the embodiments include but are not limited to the above, as long as the embodiments can perform S202 in the case where the total charging demand is less than or equal to the grid-connected power, the embodiments are within the protection scope of the application, and are not specifically limited here, and can be determined according to actual conditions.

[0051] The application provides another embodiment of the S120, and a specific process is shown in FIG. 3. The embodiment further includes the following steps:

[0052] S201, judging whether the total charging demand is less than or equal to the grid-connected power.

[0053] In the case that the total charging demand is greater than the grid-connected power, S203 is performed.

[0054] S203, according to the size relationship between the average price of the electrical energy stored by the energy storage system and the current price of the grid system, taking at least one of the grid system and the energy storage system and the new energy power generation system as a target power supply system.

[0055] It can be understood that, in the case that the total charging demand is greater than the grid-connected power, it indicates that the new energy power generation system cannot meet the charging demand, and therefore the grid system or the energy storage system needs to be further introduced for power supply.

[0056] It can be understood that the average price refers to the cost of storing unit electrical energy of the energy storage system, and the current price refers to the cost of obtaining unit electrical energy from the grid system.

[0057] In the embodiment, in the case that the total charging demand is greater than the grid-connected power, the size relationship between the average price and the current price is considered to select the system with a lower price as the target power supply system, and therefore the charging cost of the charging system can be further reduced.

[0058] The above is only one embodiment of the S120, and in actual application, the embodiment includes but is not limited to the above, as long as the embodiment can perform S203 in the case that the total charging demand is greater than the grid-connected power, and the embodiment is within the protection scope of the application, and is not specifically limited here, and can be determined according to actual conditions.

[0059] The application provides another embodiment of the S120, and a specific process is shown in FIG. 3. The embodiment further includes S201, S202 and S203, and the order of the three steps is the same as above, and details are not repeated here.

[0060] The above is only one embodiment of the S120, and in actual application, the embodiment includes but is not limited to the above, as long as the embodiment can perform S202 in the case that the total charging demand is less than or equal to the grid-connected power, and can perform S203 in the case that the total charging demand is greater than the grid-connected power, and the embodiment is within the protection scope of the application, and is not specifically limited here, and can be determined according to actual conditions.

[0061] The application provides an embodiment of the S203, and a specific process is shown in FIG. 4. The embodiment includes the following steps:

[0062] S211, acquire the average electricity price and the current electricity price.

[0063] Exemplarily, the average electricity price can be calculated in the following manner:

[0064] 1. If the electricity quantity of the energy storage system before starting charging is zero, the average electricity price is calculated according to the following formula:

[0065] wherein Cx is the average electricity price, C1 is the electricity price of the first part of the stored electricity, E1 is the electricity quantity of the first part of the stored electricity, C2 is the electricity price of the second part of the stored electricity, E2 is the electricity quantity of the second part of the stored electricity, Cn is the electricity price of the last part of the stored electricity, En is the electricity quantity of the last part of the stored electricity, and a is the conversion efficiency during charging and discharging.

[0066] 2. If the electricity quantity of the energy storage system before starting charging is not zero, the average electricity price is calculated according to the following formula:

[0067] wherein Cx is the average electricity price, C'x is the average electricity price before starting charging, E0 is the electricity quantity of the stored electricity before starting charging, C1 is the electricity price of the first part of the stored electricity, E1 is the electricity quantity of the first part of the stored electricity, C2 is the electricity price of the second part of the stored electricity, E2 is the electricity quantity of the second part of the stored electricity, Cn is the electricity price of the last part of the stored electricity, En is the electricity quantity of the last part of the stored electricity, and a is the conversion efficiency during charging and discharging.

[0068] The above example only shows one way of calculating the average electricity price, and in actual application, the calculation method is not limited to this, and can be determined according to specific conditions, which are all within the protection scope of the present application.

[0069] S212, determine whether the average electricity price is less than or equal to the current electricity price.

[0070] If the average electricity price is less than or equal to the current electricity price, S213-S215 are executed.

[0071] It can be understood that if the average electricity price is less than or equal to the current electricity price, it means that the cost of using the energy storage system to supply power at the current time is less than or equal to the cost of using the power grid system to supply power.

[0072] S213, determine whether the total charging demand is less than or equal to the sum of the grid-connected power of the new energy system and the maximum discharging power of the energy storage system.

[0073] If the total charging demand is less than or equal to the sum of the grid-connected power and the maximum discharging power, S214 is performed; if the total charging demand is greater than the sum of the grid-connected power and the maximum discharging power, S215 is performed.

[0074] It can be understood that the total charging demand being less than or equal to the sum of the grid-connected power of the new energy system and the maximum discharging power of the energy storage system indicates that the total charging demand can be met by using the new energy power generation system and the energy storage system to jointly supply power; otherwise, it indicates that the total charging demand cannot be met even if the new energy power generation system and the energy storage system are used to jointly supply power.

[0075] S214, using the new energy power generation system and the energy storage system as the target power supply system.

[0076] S215, using the new energy power generation system, the energy storage system, and the grid system as the target power supply system.

[0077] It can be understood that since the total charging demand is greater than the sum of the grid-connected power and the maximum discharging power, the grid system needs to be further introduced, so that the new energy power generation system, the energy storage system, and the grid system jointly supply power to meet the charging demand of the equipment.

[0078] In this embodiment, since the average electricity price is less than or equal to the current electricity price, in the case that the total charging demand is greater than the grid-connected power, the energy storage system and the new energy power generation system are first used to jointly supply power to the charging system, and then the grid system is used to jointly supply power to the charging system with the energy storage system and the new energy power generation system, so that the charging cost of the charging system can be further reduced.

[0079] The above is only one implementation of S203, and in actual application, implementation modes including but not limited to the above are included, as long as implementation modes including the following characteristics are included, which are within the protection scope of the present application: in the case that the average electricity price is less than or equal to the current electricity price and the total charging demand is greater than the grid-connected power, the energy storage system and the new energy power generation system are first used to jointly supply power to the charging system, and then the grid system is used to jointly supply power to the charging system with the energy storage system and the new energy power generation system; here, no specific limitation is made, and it can be determined according to specific conditions.

[0080] The present application provides another implementation of S203, and the specific process is shown in FIG. 4, which specifically includes the following steps:

[0081] S211, obtaining the average electricity price and the current electricity price.

[0082] It should be noted that the calculation method of the average electricity price has been described in detail above, and will not be repeated here.

[0083] S212, judging whether the average electricity price is less than or equal to the current electricity price.

[0084] If the average electricity price is greater than the current electricity price, S216-S218 are executed.

[0085] S216, judging whether the total charging demand is less than or equal to the sum of the grid-connected power and the maximum output power.

[0086] If the total charging demand is less than or equal to the sum of the grid-connected power and the maximum output power, S217 is executed; if the total charging demand is greater than the sum of the grid-connected power and the maximum output power, S218 is executed.

[0087] It can be understood that the total charging demand less than or equal to the sum of the grid-connected power and the maximum output power indicates that the new energy power generation system and the energy storage system can meet the total charging demand; otherwise, the new energy power generation system and the energy storage system cannot meet the total charging demand.

[0088] S217, taking the new energy power generation system and the grid system as the target power supply system.

[0089] S218, taking the new energy power generation system, the grid system and the energy storage system as the target power supply system.

[0090] It can be understood that since the total charging demand is greater than the sum of the grid-connected power and the maximum output power, the energy storage system needs to be further introduced, so that the new energy power generation system, the energy storage system and the grid system jointly supply power to meet the charging demand of the equipment.

[0091] In the embodiment, since the average electricity price is greater than the current electricity price, in the case that the total charging demand is greater than the grid-connected power, the grid system and the new energy power generation system are first increased to jointly supply power to the charging system, and then the energy storage system is increased to jointly supply power to the charging system with the grid system and the new energy power generation system, so that the charging cost of the charging system can be further reduced, and the overall benefit of charging can be further increased.

[0092] The above is only one implementation of S203, and in actual application, implementation modes including but not limited to the above are included, as long as implementation modes including the following characteristics are included, which are within the protection scope of the present application: in the case that the average electricity price is greater than the current electricity price and the total charging demand is greater than the grid-connected power, the grid system and the new energy power generation system are first increased to jointly supply power to the charging system, and then the energy storage system is increased to jointly supply power to the charging system with the grid system and the new energy power generation system; here, no specific limitation is made, and it can be determined according to specific conditions.

[0093] The application provides another implementation of S203, and a specific process is shown in FIG. 4. The implementation specifically comprises S211, S212, S213-S215 and S216-S218. The order between the steps is the same as described above, and thus is not described here.

[0094] The above is only one implementation of S120. In actual application, the implementation includes but is not limited to the above, as long as the implementation includes the following features: (1) in the case that the average electricity price is less than or equal to the current electricity price and the total charging demand is greater than the grid power, first increase the power supply of the charging system by the energy storage system and the new energy power generation system, and then increase the power supply of the charging system by the grid system, the energy storage system and the new energy power generation system; (2) in the case that the average electricity price is greater than the current electricity price and the total charging demand is greater than the grid power, first increase the power supply of the charging system by the grid system and the new energy power generation system, and then increase the power supply of the charging system by the energy storage system and the grid system and the new energy power generation system; and the specific implementation is not limited here.

[0095] The application provides another implementation of S120, and a specific process is shown in FIG. 5. The implementation further comprises the following steps before S203 in the implementation of S120 shown in FIG. 3:

[0096] S221, acquiring the stored power capacity of the energy storage system.

[0097] S222, determining whether the stored power capacity of the energy storage system is greater than a first preset value.

[0098] In the case that the stored power capacity of the energy storage system is greater than or equal to the first preset value, S203 is performed; in the case that the stored power capacity of the energy storage system is less than the first preset value, S223 is performed.

[0099] The stored power capacity of the energy storage system being less than the first preset value indicates that the stored power capacity of the energy storage system is too low, that is, if the energy storage system continues to be discharged, the energy storage system may be damaged to a certain extent; otherwise, the stored power capacity of the energy storage system is not too low, that is, if the energy storage system continues to be discharged, the energy storage system will not be damaged. In actual application, the first preset value is set according to actual conditions, and the specific implementation is not limited here.

[0100] S223, determining whether the total charging demand is less than or equal to the sum of the grid power and the maximum output power.

[0101] If the total charging demand is less than or equal to the sum of the grid-connected power and the maximum output power, S224 is performed; if the total charging demand is greater than the sum of the grid-connected power and the maximum output power, the control method is stopped.

[0102] It can be understood that the total charging demand being less than or equal to the sum of the grid-connected power and the maximum output power indicates that the new energy power generation system and the grid system jointly supplying power can meet the total charging demand; otherwise, it indicates that the new energy power generation system and the grid system jointly supplying power still cannot meet the total charging demand.

[0103] In S224, the new energy power generation system and the grid system are taken as the target power supply system.

[0104] In this embodiment, whether the energy capacity stored in the energy storage system is too low is determined by determining whether the energy capacity stored in the energy storage system is greater than a first preset value, and in the case that the energy capacity stored in the energy storage system is too low and the total charging demand is greater than the grid-connected power, the new energy power generation system and the grid system are taken as the target power supply system, i.e., the energy storage system and the new energy power generation system no longer jointly supply power to the charging system, so that damage to the energy storage system can be avoided to some extent, and the energy storage system can be protected to some extent.

[0105] Another embodiment of the control method of the charging system is provided in the present application, and the specific process can be referred to FIG. 6. This embodiment further includes the following steps before S130 in the above-mentioned embodiment:

[0106] In S310, whether the total charging demand is less than or equal to the maximum power of the target power supply system is determined.

[0107] In the case that the total charging demand is less than or equal to the maximum power of the target power supply system, S130 is performed; in the case that the total charging demand is greater than the maximum power of the target power supply system, S320 is performed.

[0108] It can be understood that the maximum power of the target power supply system refers to the maximum power that the target power supply system can provide; for example, if the target power supply system includes the new energy power generation system, the grid system and the energy storage system, the maximum power of the target power supply system is equal to the sum of the grid-connected power, the maximum output power and the maximum discharging power.

[0109] It can be understood that the total charging demand being less than or equal to the maximum power of the target power supply system indicates that the target power supply system supplying power can meet the total charging demand; otherwise, it indicates that the target power supply system supplying power cannot meet the total charging demand.

[0110] S320, controlling the target power supply system to supply power to the charging system, and limiting the charging power of at least one of the above charging vehicles.

[0111] Optionally, the basis for limiting the charging power of each of the above charging vehicles can include the SOC of each of the above charging vehicles, in actual application, but not limited thereto, which is not specifically limited here, and can be determined according to the specific circumstances, and is within the protection scope of the present application.

[0112] The present application provides a specific implementation of limiting the charging power of at least one of the above charging vehicles, which is applicable to the case where the basis for limiting is the SOC of each of the above charging vehicles; the specific process is shown in FIG. 7, and specifically includes the following steps:

[0113] S410, obtaining the SOC and charging demand of each of the above charging vehicles.

[0114] S420, controlling the first charging vehicle to charge at a charging power that meets its own charging demand, and controlling the second charging vehicle to charge at a charging power that is less than its own charging demand.

[0115] Among them, the first charging vehicle is the above charging vehicle whose SOC is greater than or equal to the second preset value, and the second charging vehicle is the above charging vehicle whose SOC is less than the second preset value.

[0116] The SOC of the above charging vehicle being greater than or equal to the second preset value indicates that the SOC of the above charging vehicle is relatively large; otherwise, it indicates that the SOC of the above charging vehicle is relatively small; in actual application, the second preset value is set according to the actual situation, which is not specifically limited here; generally, the second preset value can be equal to 90%.

[0117] Optionally, the sum of the difference between the charging demand and the charging power of each second charging vehicle can be equal to the difference between the total charging demand and the maximum power of the target power supply system, in other words, the total charging power of all the above charging vehicles at this time is equal to the maximum power of the target power supply system; the sum of the difference between the charging demand and the charging power of each second charging vehicle can be less than the difference between the total charging demand and the maximum power of the target power supply system, in other words, the total charging power of all the above charging vehicles at this time is less than the maximum power of the target power supply system; which is not specifically limited here, and can be determined according to the specific circumstances, and in actual application, the former is preferred in order to utilize the maximum power of the target power supply system.

[0118] In a specific example, the ratio of the difference between the charging demand and the charging power of each second charging vehicle is equal to the ratio of the charging demand of each second charging vehicle, in other words, the smaller the charging demand of the second charging vehicle, the smaller the limitation on its charging power, and vice versa, the greater the charging demand of the second charging vehicle, the greater the limitation on its charging power.

[0119] For example, assuming that vehicle A and vehicle B are both second charging vehicles, the charging demand of vehicle A is 10kW, the charging demand of vehicle B is 20kW, and the total power that can be currently provided is 21kW, then the charging power of vehicle A is 7kW and the charging power of vehicle B is 14kW.

[0120] The above example only illustrates one implementation of limiting the charging power of the second charging vehicle, and in actual applications, the implementation is not limited to this, and the specific implementation can be determined according to actual conditions and is within the protection scope of the present application.

[0121] In the embodiment, the charging vehicle with a large SOC can be charged at a charging power that meets its own charging demand, that is, the charging power of the charging vehicle with a large SOC is not limited, so that the charging vehicle with a large SOC can be quickly charged and leave, thereby reducing the occupancy time of the charging vehicle on the charging position, and thus more vehicles can be provided with charging services during the charging peak period, thereby improving the utilization rate of the charging system.

[0122] The above is only one implementation of limiting the charging power of at least one charging vehicle, and in actual applications, the implementation is not limited to this, and the specific implementation can be determined according to actual conditions and is within the protection scope of the present application.

[0123] The present application provides another embodiment of a control method of a charging system, and the specific process can be referred to FIG. 8. The embodiment is based on any of the above embodiments, and further includes the following steps:

[0124] S510, in the case that the current electricity price of the power grid system is not equal to the highest electricity price in a day and the charging total demand is met, controlling the power grid system to charge the energy storage system.

[0125] It should be noted that in actual applications, the charging situation of the day can be predicted according to the historical charging data of the charging system, and the power grid system is controlled to charge the energy storage system at the lowest electricity price period of the day according to the prediction result.

[0126] In the embodiment, since the power grid system is controlled to charge the energy storage system when the current electricity price of the power grid system is not equal to the highest electricity price in a day and the charging total demand is met, the average electricity price of the electricity stored in the energy storage system can be as low as possible, in other words, the power grid system can be used less to supply power to the charging system during the charging peak period, thereby reducing the charging cost of the charging system, and further improving the charging benefit.

[0127] Another embodiment of the control method of the charging system is provided in the present application, and the specific process can be seen from FIG. 9. The embodiment is based on the above-mentioned embodiment, and further includes the following steps:

[0128] S610, obtaining the current charging curve of each charging vehicle.

[0129] S620, comparing the current charging curve of each charging vehicle with the reference charging curve of each charging vehicle respectively, and outputting a prompt signal to the charging vehicle whose difference between the current charging curve and the reference charging curve is greater than a preset degree.

[0130] The current charging curve of the charging vehicle is the charging curve of the charging vehicle in the current charging process, and the reference charging curve of the charging vehicle is the charging curve of a vehicle of the same model as the charging vehicle in the normal charging process.

[0131] It should be noted that the charging system can improve the reference charging curve of different models of the charging vehicle through accumulated charging big data.

[0132] The charging system determines the reference charging curve according to a large amount of charging data. The specific determination method is very mature in the prior art, and will not be described in detail here.

[0133] If the difference between the current charging curve and the reference charging curve is greater than a preset degree, it means that the difference between them is large, in other words, the current charging curve does not conform to the reference charging curve. On the contrary, it means that the difference between them is small, in other words, the current charging curve conforms to the reference charging curve. In actual application, the preset degree is set according to actual conditions, and is not limited here.

[0134] For example, when it is found that the current charging curve of a charging vehicle of A brand B model is greatly different from the charging curve of the charging vehicle of A brand B model, a prompt signal is output to the charging vehicle.

[0135] The prompt signal is used to inform the corresponding charging vehicle that its own charging is abnormal. When the corresponding charging vehicle receives the prompt signal, it will send a prompt to inform the owner to check in time.

[0136] In this embodiment, since the prompt signal can be output to the corresponding charging vehicle when there is a large difference between the current charging curve of the charging vehicle and the reference charging curve of the charging vehicle of the same model, the charging safety of the charging vehicle can be ensured to a certain extent, so that damage to the charging system or the charging vehicle can be avoided to a certain extent.

[0137] The application provides a charging system, the specific structure of which is shown in Figure 1, and specifically comprises: an energy management system 41 and at least two charging piles 42; the connection relationship between each device is specifically described as follows:

[0138] The power supply ends of all charging piles 42 are connected, and the connection point is used as the power supply end of the charging system 40, and is connected with the power grid system 10, the new energy power generation system 20 and the energy storage system 30 respectively; the charging ends of each charging pile 42 are connected with each charging vehicle 50 respectively.

[0139] The energy management system 41 is in communication connection with the power grid system 10, the new energy power generation system 20, the energy storage system 30 and each charging pile 42 respectively.

[0140] It should be noted that the electrical connection relationship between each device is described in detail in the above embodiment, which will not be repeated here.

[0141] The energy management system 41 is used for executing the control method of the charging system provided in any of the above embodiments.

[0142] It should be noted that the energy management system is also used for directly obtaining required data from the charging pile 42, such as the charging information of the charging state, the current charging power and the charging demand of the above charging vehicle 50, and the current charging curve of the above charging vehicle, and the energy management system 41 can also improve the reference curve of different models of the above charging vehicle 50 through accumulated charging big data.

[0143] The application provides another embodiment of the charging system in the charging station, the specific structure of which is shown in Figure 10, and this embodiment further comprises an operation platform 43 on the basis of any of the above embodiments; the connection relationship between this device and other devices is specifically described as follows:

[0144] The energy management system is in communication connection with the operation platform 43, and the operation platform 43 is in communication connection with each charging pile.

[0145] It should be noted that the energy management system obtains the above charging information and the current charging curve of the above charging vehicle through the operation platform 43 at this time; in addition, the operation platform is very mature in the prior art, and will not be described in detail here.

[0146] The application provides a charging station, which specifically comprises: a power grid system, a new energy power generation system, an energy storage system and a charging system in the charging station provided in the above embodiments.

[0147] It should be noted that the connection relationship between the power grid system, the new energy power generation system, the energy storage system and the charging system has been described in detail in the above embodiments and will not be repeated here.

[0148] The above description of the disclosed embodiments is merely exemplary and not limiting. Since modifications and changes to the described embodiments are obvious in view of the teachings disclosed herein, it is intended that the present disclosure be understood to include all such modifications and alterations with the scope of the present application being indicated by the following claims.

Claims

1. A control method of a charging system, characterized by, The power supply end of the charging system is connected with a power grid system, a new energy power generation system and an energy storage system respectively; a control method of the charging system comprises: obtaining total charging demand of all charging vehicles connected with the charging system; determining a target power supply system according to a size relationship among the total charging demand, maximum output power of the power grid system, grid-connected power of the new energy power generation system and maximum discharging power of the energy storage system, wherein the target power supply system comprises at least one of the power grid system, the new energy power generation system and the energy storage system; controlling the target power supply system to supply power to the charging system.

2. The control method of the charging system according to claim 1, characterized by, determining a target power supply system according to a size relationship among the total charging demand, maximum output power of the power grid system, grid-connected power of the new energy power generation system and maximum discharging power of the energy storage system, comprises: in a case that the total charging demand is less than or equal to the grid-connected power, taking the new energy power generation system as the target power supply system.

3. The control method of the charging system according to claim 1, characterized by, determining a target power supply system according to a size relationship among the total charging demand, maximum output power of the power grid system, grid-connected power of the new energy power generation system and maximum discharging power of the energy storage system, comprises: in a case that the total charging demand is greater than the grid-connected power, taking at least one of the power grid system and the energy storage system and the new energy power generation system as the target power supply system according to a size relationship between an average price of electric energy stored in the energy storage system and a current price of the power grid system.

4. The control method of the charging system according to claim 3, characterized by, taking at least one of the power grid system and the energy storage system and the new energy power generation system as the target power supply system according to a size relationship between an average price of electric energy stored in the energy storage system and a current price of the power grid system, comprises: obtaining the above-mentioned average price and the above-mentioned current price; in a case that the average price is less than or equal to the current price, if the total charging demand is less than or equal to a sum of the grid-connected power and the maximum discharging power, taking the new energy power generation system and the energy storage system as the target power supply system; in a case that the average price is less than or equal to the current price, if the total charging demand is greater than the sum of the grid-connected power and the maximum discharging power, taking the new energy power generation system, the energy storage system and the power grid system as the target power supply system.

5. The control method of the charging system according to claim 3, characterized by, taking at least one of the power grid system and the energy storage system and the new energy power generation system as the target power supply system according to a size relationship between an average price of electric energy stored in the energy storage system and a current price of the power grid system, comprises: obtaining the above-mentioned average price and the above-mentioned current price; in a case that the average price is greater than the current price, if the total charging demand is less than or equal to a sum of the grid-connected power and the maximum output power, taking the new energy power generation system and the power grid system as the target power supply system; In the case that the average electricity price is greater than the current electricity price, if the total charging demand is greater than the sum of the grid-connected power and the maximum discharging power, the new energy power generation system, the grid system and the energy storage system are taken as the target power supply system.

6. The control method of the charging system according to claim 3, characterized by, Before the at least one of the grid system and the energy storage system and the new energy power generation system are taken as the target power supply system according to the size relationship between the average electricity price of the energy stored in the energy storage system and the current electricity price of the grid system, further comprising: acquiring the capacity of the energy stored in the energy storage system; in the case that the capacity of the energy stored in the energy storage system is greater than a first preset value, performing the step of taking the at least one of the grid system and the energy storage system and the new energy power generation system as the target power supply system according to the size relationship between the average electricity price of the energy stored in the energy storage system and the current electricity price of the grid system; in the case that the capacity of the energy stored in the energy storage system is less than or equal to the first preset value, if the total charging demand is less than or equal to the sum of the grid-connected power and the maximum output power, the new energy power generation system and the grid system are taken as the target power supply system.

7. The control method of the charging system according to any one of claims 1 to 6, characterized by, Before the target power supply system supplies power to the charging system, the control method of the charging system further comprises: in the case that the total charging demand is less than or equal to the maximum power of the target power supply system, performing the step of controlling the target power supply system to supply power to the charging system; in the case that the total charging demand is greater than the maximum power of the target power supply system, controlling the target power supply system to supply power to the charging system and limiting the charging power of at least one of the charging vehicles.

8. The control method of the charging system according to claim 7, characterized by, Limiting the charging power of at least one of the charging vehicles comprises: acquiring the SOC and charging demand of each of the charging vehicles; controlling a first charging vehicle to charge at a charging power that meets its own charging demand, and controlling a second charging vehicle to charge at a charging power that is less than its own charging demand, wherein the first charging vehicle is the charging vehicle whose SOC is greater than or equal to a second preset value, and the second charging vehicle is the charging vehicle whose SOC is less than the second preset value.

9. The control method of the charging system according to claim 8, characterized by, The sum of the differences between the charging demand of each of the second charging vehicles and its own charging power is equal to the difference between the total charging demand and the maximum power of the target power supply system.

10. The control method of the charging system according to any one of claims 1 to 6, characterized by, Further comprising: in the case that the current electricity price of the grid system is not equal to the highest electricity price in a day and the total charging demand is met, controlling the grid system to charge the energy storage system.

11. A charging system, characterized by Comprising: an energy management system and at least two charging piles; wherein: the power supply ends of all the charging piles are connected, and the connection point is taken as the power supply end of the charging system, and is connected with the grid system, the new energy power generation system and the energy storage system respectively; the energy management system is in communication connection with the grid system, the new energy power generation system, the energy storage system and each of the charging piles respectively; the energy management system is used to perform the control method of the charging system according to any one of claims 1 to 10.

12. The charging system of claim 11, wherein, Further comprising: An operation platform; wherein: The energy management system is in communication connection with the operation platform, and the operation platform is in communication connection with each of the charging piles.

13. A charging station, characterized in that Comprise: A power grid system, a new energy power generation system, an energy storage system, and the charging system according to claim 11 or 12.

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