Generation method of charging and discharging strategy for electric vehicles in V2G mode

Abstract

The present invention provides a method for generating a charging and discharging strategy for electric vehicles in a V2G mode, and relates to the technical field of V2G. The method comprises: S1: taking a single electric vehicle as an object, on the basis of meeting the charging and discharging demand of the electric vehicle, considering the charging and discharging price to optimize the economy of the single electric vehicle, and generating the charging and discharging power of each electric vehicle in each scheduling period; S2: taking all electric vehicles in the substation as an object, verifying and correcting the charging and discharging power of each electric vehicle generated by S1 in each scheduling period, so that the charging and discharging power finally executed by all electric vehicles meets the charging and discharging capacity constraint of the substation, obtaining the corrected charging and discharging power of each electric vehicle in each scheduling period, and replacing the charging and discharging power generated by S1 with the corrected charging and discharging power. The method can make the charging and discharging power of electric vehicles meet the charging and discharging capacity constraint of the substation, while meeting the charging and discharging demand of electric vehicles and improving the economy of charging and discharging.

Description

Technical Field

[0001] The present invention relates to the field of V2G technology, and in particular to a method for generating a charging and discharging strategy for an electric vehicle in a V2G mode. Background Art

[0002] On the one hand, with the rapid growth of electric vehicles, electric vehicle charging has brought a significant impact on the capacity of distribution network areas. Disorderly charging of electric vehicles may exceed the capacity of distribution network areas, and the charging behavior of electric vehicles needs to be optimized.

[0003] On the other hand, V2G (full name: Vehicle-to-grid, Chinese name: Vehicle to Grid) technology can realize the two-way interaction of information and energy between electric vehicles and the grid. Electric vehicles can not only charge from the grid, but also discharge to the grid. In the V2G mode, under the time-of-use electricity price or spot market mechanism, electric vehicles can charge during low electricity price periods and discharge during high electricity price periods, thereby obtaining certain discharge benefits and reducing charging costs.

[0004] Therefore, there is an urgent need for a method to generate charging and discharging strategies for electric vehicles under the V2G mode to solve the capacity limitation problems of distribution network areas, the charging and discharging needs of electric vehicles, and the economic issues. Summary of the invention

[0005] The purpose of the present invention includes providing a method for generating a charging and discharging strategy for an electric vehicle in a V2G mode, which can make the charging and discharging power of the electric vehicle meet the charging and discharging capacity constraints of the station area, while meeting the charging and discharging needs of the electric vehicle and improving the economy of charging and discharging.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] The present invention provides a method for generating a charging and discharging strategy for an electric vehicle in a V2G mode, the strategy generating method comprising:

[0008] S1: Taking a single electric vehicle as the object, on the basis of meeting the charging and discharging needs of the electric vehicle, considering the charging and discharging price to optimize the economy of the single electric vehicle, the charging and discharging power of each electric vehicle in each scheduling period is generated; wherein the charging and discharging power includes charging power and discharging power;

[0009] S2: Taking all electric vehicles in the area as the object, the charge and discharge power of each electric vehicle generated by S1 in each scheduling period is verified and corrected, so that the charge and discharge power finally executed by all electric vehicles meets the charge and discharge capacity constraint of the area, and the corrected charge and discharge power of each electric vehicle in each scheduling period is obtained, and the corrected charge and discharge power is returned to S1, so that the corrected charge and discharge power replaces the charge and discharge power generated by S1;

[0010] S3: After the corrected charge and discharge power replaces the charge and discharge power generated by S1, if the allocated scheduling period in S1 cannot meet the charge and discharge needs of the electric vehicle, the subsequent scheduling period will continue to be allocated to charge and discharge the electric vehicle, and the regenerated charge and discharge power will be corrected until the charge and discharge needs of the electric vehicle are met or all scheduling periods are allocated, forming a complete charge and discharge strategy.

[0011] The beneficial effects of the method for generating a charging and discharging strategy for an electric vehicle in a V2G mode provided by an embodiment of the present invention include:

[0012] 1. Executing S1 enables the charging and discharging strategy of electric vehicles generated by the method to not only meet the charging and discharging requirements of electric vehicles, but also improve the economic efficiency of electric vehicles participating in grid interaction;

[0013] 2. Execute S2 to correct the charge and discharge power of the electric vehicle generated in S1, so that the final charge and discharge power executed by the electric vehicle (that is, the corrected charge and discharge power) meets the capacity constraints of the substation (including discharge capacity constraints and charging capacity constraints), avoiding impact on the power grid of the substation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 A flowchart of a method for generating a charging and discharging strategy for an electric vehicle in a V2G mode provided by an embodiment of the present invention;

[0016] Figure 2 is the specific flow chart of S1;

[0017] Figure 3 is a specific flow chart for correcting the charging power in S2;

[0018] Figure 4 This is a specific flow chart for correcting the discharge power in S2. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0023] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0024] Please refer to Figure 1 This embodiment provides a method for generating a charging and discharging strategy for an electric vehicle in a V2G mode (hereinafter referred to as a strategy generation method). The strategy generation method includes the following steps:

[0025] S1: Taking a single electric vehicle as the object, on the basis of meeting the charging and discharging needs of the electric vehicle, considering the charging and discharging price to optimize the economy of a single electric vehicle, and generating the charging and discharging power of each electric vehicle in each scheduling period.

[0026] Among them, the charge and discharge power includes discharge power and charge power, please refer to Figure 2 , S1 specifically includes the following steps:

[0027] S11: Determine the charging and discharging mode of the electric vehicle. The charging and discharging mode of the electric vehicle includes a discharging mode and a chargeable and dischargeable mode. The mode of the electric vehicle is selected by the owner.

[0028] (1) When the electric vehicle is in the discharge mode, S12 is performed.

[0029] S12: Calculate the current discharge capacity Q of the electric vehicle 放 .

[0030] Current discharge capacity Q 放 The calculation formula is as follows:

[0031] Q 放 =(SOC 当前 -SOC 目标 )*Q 总

[0032] Among them, SOC 当前 is the current SOC of the electric vehicle, SOC 目标 The target SOC of the electric vehicle set by the car owner, Q 总 is the total battery capacity of the electric vehicle.

[0033] S13: Sort the scheduling periods according to a first rule, wherein the first rule is to first consider scheduling periods with high discharge prices, and secondly consider scheduling periods with earlier discharge times.

[0034] Among them, the scheduling period refers to dividing the entire scheduling time into multiple scheduling periods in sequence. The entire scheduling time refers to the time interval during which the strategy generation method runs, that is, the time interval from the current period to the period before the electric vehicle leaves. For example, if the current entire scheduling time is 10 hours, the entire scheduling time can be divided into 10 scheduling periods in chronological order. The duration of each scheduling period is 1 hour. In other words, the strategy generation method must be rerun every 1 hour.

[0035] The scheduling periods are sorted according to the first rule. For example, the discharge price of the first scheduling period is 2 yuan / kWh, the discharge price of the second scheduling period is 1 yuan / kWh, and the discharge price of the third scheduling period is 2 yuan / kWh. Then the first scheduling period is ranked first, the third scheduling period is ranked second, and the second scheduling period is ranked third.

[0036] In this way, the electric vehicles with discharge demand can achieve the highest discharge benefits and the best economy, and the discharge demand can be completed as quickly as possible.

[0037] S14: The current discharge amount Q of the electric vehicle 放 The rated discharge power is allocated to the sorted scheduling periods in sequence.

[0038] For example, the current discharge capacity of an electric vehicle, Q 放 The rated discharge power of the electric vehicle is 21kWh, and the rated discharge power of the electric vehicle is 7kW. The discharge time required for the electric vehicle is 3h. The top three scheduling periods are selected for discharge, and 7kWh is discharged in each scheduling period.

[0039] (2) When the electric vehicle is in the chargeable and dischargeable mode, S15 is performed.

[0040] S15: Determine whether SOC 当前 ≥SOC 目标 .

[0041] In SOC 当前 ≥SOC 目标 In the case of , it is determined that the electric vehicle needs to be discharged, and S16 is performed.

[0042] S16: Calculate the current discharge capacity Q of the electric vehicle 放 .

[0043] S17: Sort the scheduling periods according to the second rule, wherein the second rule is to first consider the scheduling periods with high discharge prices, and secondly consider the scheduling periods with later discharge times.

[0044] For example, the discharge price of the first scheduling period is 2 yuan / kWh, the discharge price of the second scheduling period is 1 yuan / kWh, and the discharge price of the third scheduling period is 2 yuan / kWh. Then the third scheduling period ranks first, the first scheduling period ranks second, and the second scheduling period ranks third.

[0045] In this way, for electric vehicles with chargeable and dischargeable modes, not only can the discharge benefits be maximized and the economy be improved, but also, for the dispatching periods with the same discharge price, the dispatching periods with later discharge times are ranked earlier, which makes the actual discharge time of the electric vehicle later, thus avoiding insufficient charging or over-discharging of the electric vehicle in the early stage, and the final SOC being lower than SOC 目标 .

[0046] S18: The current dischargeable amount Q of the electric vehicle 放 The rated discharge power is allocated to the sorted scheduling periods in sequence.

[0047] In SOC 当前 <SOC 目标 In the case of , it is determined that the electric vehicle needs to be charged and the process goes to S19.

[0048] S19: Calculate the current required charging amount Q of the electric vehicle 充 .

[0049] Current required charge amount Q 充 The calculation formula is as follows:

[0050] Q 放 =(SOC 目标 -SOC 当前 )*Q 总

[0051] S20: Sort the scheduling time periods according to the third rule, wherein the third rule is to first consider the scheduling time periods with low charging prices, and secondly consider the scheduling time periods with earlier charging times.

[0052] For example, if the charging price in the first scheduling period is 2 yuan / kWh, the charging price in the second scheduling period is 1 yuan / kWh, and the charging price in the third scheduling period is 2 yuan / kWh, then the second scheduling period ranks first, the first scheduling period ranks second, and the third scheduling period ranks third.

[0053] In this way, the cost of charging electric vehicles with charging needs can be minimized and the economy can be optimized, and the charging needs can be completed as quickly as possible.

[0054] S21: The current required charging amount Q of the electric vehicle 充 The rated charging power is allocated to the sorted scheduling time periods in sequence.

[0055] For example, the current required charge amount Q of an electric vehicle 充 It is 21kWh, and the rated charging power of the electric vehicle is 7kW / h. The charging time required for the electric vehicle is 3h. The top three scheduling periods are selected for charging, and 7kWh is charged in each scheduling period.

[0056] The current discharge capacity Q of the electric vehicle 放 Or the current required charge amount Q 充 After being allocated to the corresponding scheduling period, S22 is performed.

[0057] S22: In the remaining scheduling period after allocation, the charging amount of the electric vehicle is controlled to be equal to the discharging amount of the electric vehicle, and the charging and discharging benefits are maximized.

[0058] Among them, maximizing the charging and discharging benefits means maximizing the difference between the discharging benefit and the charging cost.

[0059] For example, among a total of 15 scheduling periods that have been sorted, electric vehicles have been allocated for charging or discharging in the first three scheduling periods. Then, in the remaining 12 scheduling periods, the charging amount of electric vehicles is arranged to be equal to the discharging amount of electric vehicles, and the charging price is not higher than the discharging price, thereby further improving the comprehensive benefits of electric vehicles and improving economic efficiency.

[0060] Specifically, S22 includes the following steps:

[0061] S221: Sort the remaining scheduling time periods after allocation according to the fourth rule.

[0062] Among them, the fourth rule is divided into two steps. In the first step, the scheduling time periods with high discharge prices are first considered, and then the scheduling time periods with later discharge times are considered (i.e., the second rule). The remaining scheduling time periods after allocation are sorted in sequence, and the first 1 / 2 scheduling time periods are selected; in the second step, the scheduling time periods with low charging prices are first considered, and then the scheduling time periods with earlier charging times are considered (i.e., the third rule). The remaining 1 / 2 scheduling time periods in the first step are sorted.

[0063] In this way, after the first and second steps, the remaining scheduling time periods after allocation are sorted. Among them, the first 1 / 2 of the scheduling time periods are selectable discharge time periods, and the discharge price of the discharge time periods is gradually reduced. The last 1 / 2 of the scheduling time periods are selectable charging time periods, and the charging price of the charging time periods is gradually increased.

[0064] S222: Arrange the electric vehicle to charge and discharge according to the remaining and sorted scheduling time periods after allocation until the charging price is not higher than the discharging price. The charging and discharging power of the electric vehicle is the rated power.

[0065] Among them, until the charging price is not higher than the discharging price means that the charging price of the last allocated charging period is not higher than the discharging price of the last allocated discharging period. For example, in the remaining 12 scheduling periods after allocation, the 1st to 6th scheduling periods are discharging periods, and the discharge prices are 6 yuan / kWh, 5 yuan / kWh, 4 yuan / kWh, 3 yuan / kWh, 2 yuan / kWh, and 1 yuan / kWh respectively. The 7th to 12th scheduling periods are charging periods, and the charging prices are 1 yuan / kWh, 2 yuan / kWh, 3 yuan / kWh, 4 yuan / kWh, 5 yuan / kWh, and 6 yuan / kWh respectively.

[0066] Under the condition that the charging amount of the electric vehicle is equal to the discharging amount of the electric vehicle and the charging price is not higher than the discharging price, the 1st to 3rd scheduling periods can be arranged for discharging, the 4th to 6th scheduling periods can be arranged for no charging or discharging, the 7th to 9th scheduling periods can be arranged for charging, and the 10th to 12th scheduling periods can be arranged for no charging or discharging.

[0067] In this way, the above steps allocate the charging and discharging of a single electric vehicle to each scheduling period, which can not only meet the charging and discharging needs of the electric vehicle, but also improve the economy of the electric vehicle. Next, this embodiment considers that the charging and discharging power of all electric vehicles also needs to meet the charging and discharging capacity constraints of the station area.

[0068] S2: Taking all electric vehicles in the substation as the object, the charge and discharge power of each electric vehicle generated by S1 in each scheduling period is verified and corrected, so that the charge and discharge power finally executed by all electric vehicles meets the charge and discharge capacity constraints of the substation, and the corrected charge and discharge power of each electric vehicle in each scheduling period is obtained, and the corrected charge and discharge power is returned to S1, so that the corrected charge and discharge power replaces the charge and discharge power generated by S1.

[0069] Specifically, S2 includes correcting the charging power and correcting the discharging power, including the following steps:

[0070] (1) Please refer to Figure 3 , correct the charging power

[0071] S23: Calculate the available charging capacity Q for electric vehicles in the area 充容 .

[0072] Available charging capacity Q 充容 The calculation formula is as follows:

[0073] Q 充容 =Q 台容 -Q 负 +Q 车放

[0074] Among them, Q 台容 is the area capacity, Q 负 is the load forecast value of non-electric vehicles in the substation area, Q 车放 is the discharge amount of electric vehicles in the area.

[0075] S24: Determine the available charging capacity Q 充容 Is it not less than the current required charging capacity Q of all electric vehicles in the area? 总充 .

[0076] Among them, S19 calculates the current required charging amount Q of a single electric vehicle 充 , the current required charging capacity Q of all electric vehicles in the area can be calculated 总充 .

[0077] In Q 充容 ≥Q 总充 In this case, proceed to S25.

[0078] S25: Determine that the corrected charging power is equal to the charging power of the electric vehicle generated in S1. That is, the charging power of the electric vehicle generated in S1 is not modified.

[0079] In Q 充容 <Q 总充 In this case, proceed to S26.

[0080] S26: Determine that the corrected charging power is equal to the charging power Q of the electric vehicle generated in S1 充容 / Q 总充 times.

[0081] That is, the corrected charging power is reduced to Q of the charging power of the electric vehicle generated in S1. 充容 / Q 总充 In this way, the available charging capacity Q of the electric vehicle can be 充容 Just enough to charge all electric vehicles in the area.

[0082] (2) Please refer to Figure 4 , to correct the discharge power

[0083] S27: Calculate the available discharge capacity Q of the area for electric vehicles 放容 .

[0084] Available discharge capacity Q 放容 The calculation formula is as follows:

[0085] Q 放容 =Q 台负

[0086] Among them, Q 台负 is the total load forecast value of the substation.

[0087] S28: Determine the available discharge capacity Q 放容 Is it not less than the current required discharge capacity Q of all electric vehicles in the area? 总放 .

[0088] Among them, S16 calculates the current discharge capacity Q of a single electric vehicle 放 , the current required discharge capacity Q of all electric vehicles in the area can be calculated 总放 .

[0089] In Q 放容 ≥Q 总放 In this case, proceed to S29.

[0090] S29: Determine that the corrected discharge power is equal to the discharge power of the electric vehicle generated in S1. That is, the discharge power of the electric vehicle generated in S1 is not modified.

[0091] In Q 放容 <Q 总放 In this case, S30 is performed.

[0092] S30: Determine that the corrected discharge power is equal to the discharge power Q of the electric vehicle generated in S1 放容 / Q 总放 times.

[0093] That is, the corrected discharge power is reduced to Q of the discharge power of the electric vehicle generated in S1. 放容 / Q 总放 In this way, the available discharge capacity Q of the electric vehicle can be 放容 Just enough to discharge all electric vehicles in the area.

[0094] S3: After the corrected charge and discharge power replaces the charge and discharge power generated by S1, if the allocated scheduling period in S1 cannot meet the charge and discharge needs of the electric vehicle, the subsequent scheduling period will continue to be allocated to charge and discharge the electric vehicle, and the regenerated charge and discharge power will be corrected until the charge and discharge needs of the electric vehicle are met or all scheduling periods are allocated, forming a complete charge and discharge strategy.

[0095] In other words, the corrected charging and discharging power is generally less than the charging power originally generated in S1. If the charging and discharging is still performed only according to the dispatching period assigned in S1, the charging and discharging needs of the electric vehicle will not be met. Therefore, S3 will continue to allocate subsequent dispatching periods to charge and discharge the electric vehicle, and correct the regenerated charging and discharging power until the charging and discharging needs of the electric vehicle are met. If the charging and discharging needs of the electric vehicle cannot be met after all dispatching periods are allocated due to the capacity constraints of the station area, the execution will be completed after all dispatching periods are allocated. Correspondingly, the SOC originally set by the owner 目标 If it cannot be achieved, a reminder message can be sent to the car owner, informing him that the charging and discharging power has been reduced due to the charging and discharging capacity constraints of the station, and the car owner will be informed of the SOC that can ultimately be achieved.

[0096] S4: For the charging and discharging power in the complete charging and discharging strategy formed by S3, a correction and update is performed every time a scheduling period is interval to meet the current charging and discharging capacity constraints of the substation.

[0097] That is to say, after executing S3 to form a complete charging and discharging strategy, the charging and discharging strategy formed by S3 is executed during the duration of the first scheduling period. When the duration of the first scheduling period is reached, the charging and discharging power of each scheduling period in the charging and discharging strategy is corrected according to the current charging and discharging capacity constraints of the station area. The charging and discharging strategy may not need to be adjusted, and the charging and discharging power of one or some scheduling periods in the charging and discharging strategy may be reduced. In this case, the electric vehicles will continue to be charged and discharged in the subsequent scheduling periods allocated in S3.

[0098] Example

[0099] The current discharge capacity of electric vehicles Q 放 It is 28kWh, the rated discharge power of the electric vehicle is 7kW, the scheduling time is 10 hours, and the scheduling period interval is 1 hour.

[0100] At the beginning of the first scheduling period, the discharge power of the electric vehicle in each scheduling period is generated according to S1 as shown in Table 1 below:

[0101] Table 1

[0102] Scheduling period one two three Four Discharge power 7kW 7kW 7kW 7kW

[0103] According to S2, the discharge power of the electric vehicle in each scheduling period is verified and corrected to meet the discharge capacity constraint of the station area. If the corrected discharge power of the second-ranked scheduling period is 3kW, and the corrected discharge powers of the first, third and fourth-ranked scheduling periods are equal to the discharge power generated in S1, then after executing S2, the discharge power of the electric vehicle in each scheduling period is as shown in Table 2 below:

[0104] Table 2

[0105] Scheduling period one two three Four Discharge power 7kW 3kW 7kW 7kW

[0106] After executing S2, because the discharge power after correction in the second scheduling period is less than the discharge power originally generated in S1, the first four scheduling periods can no longer meet the discharge demand of the electric vehicle (7+3+7+7<28), then S3 is executed to continue to allocate subsequent scheduling periods to charge and discharge the electric vehicle, and the discharge power of the electric vehicle in each scheduling period is obtained again as shown in Table 3 below:

[0107] Table 3

[0108] Scheduling period one two three Four five Discharge power 7kW 3kW 7kW 7kW 7kW

[0109] Next, in S3, the charging and discharging power planned for each subsequent scheduling period in Table 3 needs to be corrected to meet the discharge capacity constraint of the station area. If the corrected discharge power of the fifth scheduling period is 2kW, and the others remain unchanged, the corrected discharge power of the electric vehicle in each scheduling period is shown in Table 4 below:

[0110] Table 4

[0111] Scheduling period one two three Four five Discharge power 7kW 3kW 7kW 7kW 2kW

[0112] If discharging according to the dispatching period allocated in Table 4 still cannot meet the discharge demand of the electric vehicle (7+3+7+7+2<28), then the subsequent dispatching period will be allocated to discharge the electric vehicle, and the discharge power of the electric vehicle in each dispatching period will be obtained, that is, a complete discharge strategy is formed as shown in Table 5 below:

[0113] Table 5

[0114]

[0115] Of course, the discharge strategy shown in Table 5 also needs to be modified to meet the station discharge capacity constraint. If the modified discharge power does not change, the electric vehicle will discharge throughout the first to fifth scheduling periods and only discharge 2 kWh in the sixth scheduling period.

[0116] After forming the charge and discharge strategy shown in Table 5, S4 is executed, that is, the electric vehicle is controlled to start executing the charge and discharge strategy shown in Table 5, and a correction and update is performed every time the duration of a scheduling period (for example, 1h) to meet the current station area discharge capacity constraint, because the station area discharge capacity constraint is generally affected by environmental factors and changes over time. For example, when the first scheduling period in Table 5 is completed, the discharge power of the remaining scheduling periods in Table 5 also needs to be corrected to meet the current station area discharge capacity constraint. If the corrected discharge power cannot meet the discharge demand of the electric vehicle, the subsequent scheduling periods will continue to be allocated.

[0117] Of course, the order of the scheduling periods in Tables 1 to 5 must also satisfy the ordering rules in S1 and S2. In this way, the discharge process of the electric vehicle not only meets the discharge demand of the electric vehicle and maximizes the discharge benefit, but also complies with the discharge capacity constraint of the station area.

[0118] The beneficial effects of the method for generating a charging and discharging strategy for an electric vehicle in a V2G mode provided in this embodiment include:

[0119] 1. Executing S1 enables the charging and discharging strategy of electric vehicles generated by the method to not only meet the charging and discharging needs of electric vehicles, but also reduce the charging cost of electric vehicles, increase the discharge income of electric vehicles, and improve the economic efficiency of electric vehicles participating in grid interaction;

[0120] 2. Execute S2 to correct the charge and discharge power of the electric vehicle generated in S1, so that the final charge and discharge power executed by the electric vehicle (that is, the corrected charge and discharge power) meets the capacity constraints of the substation (including discharge capacity constraints and charging capacity constraints), avoiding impact on the power grid of the substation.

[0121] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for generating a charging and discharging strategy for an electric vehicle in a V2G mode, characterized in that: The strategy generation method comprises: S1: Taking a single electric vehicle as the object, on the basis of meeting the charging and discharging needs of the electric vehicle, considering the charging and discharging price to optimize the economy of the single electric vehicle, the charging and discharging power of each electric vehicle in each scheduling period is generated; wherein the charging and discharging power includes charging power and discharging power; S2: Taking all electric vehicles in the area as the object, the charge and discharge power of each electric vehicle generated by S1 in each scheduling period is verified and corrected, so that the charge and discharge power finally executed by all electric vehicles meets the charge and discharge capacity constraint of the area, and the corrected charge and discharge power of each electric vehicle in each scheduling period is obtained, and the corrected charge and discharge power is returned to S1, so that the corrected charge and discharge power replaces the charge and discharge power generated by S1; S3: After the corrected charge and discharge power replaces the charge and discharge power generated by S1, if the allocated scheduling period in S1 cannot meet the charge and discharge needs of the electric vehicle, the subsequent scheduling period will continue to be allocated to charge and discharge the electric vehicle, and the regenerated charge and discharge power will be corrected until the charge and discharge needs of the electric vehicle are met or all scheduling periods are allocated, forming a complete charge and discharge strategy.

2. The method for generating a charging and discharging strategy for an electric vehicle in a V2G mode according to claim 1, characterized in that: After S3, the strategy generation method further includes: S4: For the charging and discharging power in the complete charging and discharging strategy formed by S3, a correction and update is performed every time a scheduling period is interval to meet the current charging and discharging capacity constraints of the substation.

3. The method for generating a charging and discharging strategy for an electric vehicle in a V2G mode according to claim 1, characterized in that: S1 includes: S11: Determine the charging and discharging mode of the electric vehicle; When the electric vehicle is in the discharge mode, S12 is performed: calculating the current dischargeable amount Q of the electric vehicle 放 ; S13: sorting the scheduling periods according to a first rule, wherein the first rule is to first consider the scheduling periods with high discharge prices, and secondly consider the scheduling periods with earlier discharge times; S14: The current discharge amount Q of the electric vehicle 放 The rated discharge power is allocated to the sorted scheduling periods in sequence.

4. The method for generating a charging and discharging strategy for an electric vehicle in a V2G mode according to claim 3, characterized in that: S1 also includes: When the electric vehicle is in the chargeable and dischargeable mode, S15 is performed: determining whether the SOC 当前 ≥SOC 目标 ; S16: Calculate the current discharge capacity Q of the electric vehicle 放 ; S17: sorting the scheduling periods according to a second rule, wherein the second rule is to first consider scheduling periods with high discharge prices, and secondly consider scheduling periods with later discharge times; S18: The current dischargeable amount Q of the electric vehicle 放 The rated discharge power is allocated to the sorted scheduling periods in sequence.

5. The method for generating a charging and discharging strategy for an electric vehicle in a V2G mode according to claim 4, characterized in that: S1 also includes: In SOC 当前 <SOC 目标 In the case of, S19: Calculate the current required charging amount Q of the electric vehicle 充 ; S20: sorting the scheduling periods according to a third rule, wherein the third rule is to first consider the scheduling periods with low charging prices, and secondly consider the scheduling periods with earlier charging times; S21: The current required charging amount Q of the electric vehicle 充 The rated charging power is allocated to the sorted scheduling time periods in sequence.

6. The method for generating a charging and discharging strategy for an electric vehicle in a V2G mode according to claim 5, characterized in that: The current discharge capacity Q of the electric vehicle 放 Or the current required charge amount Q 充 After being allocated to the corresponding scheduling period, S1 also includes: S22: In the remaining scheduling period after allocation, the charging amount of the electric vehicle is controlled to be equal to the discharging amount of the electric vehicle, and the charging and discharging benefits are maximized.

7. The method for generating a charging and discharging strategy for an electric vehicle in a V2G mode according to claim 6, characterized in that: S22 includes: S221: sorting the remaining scheduling periods after allocation according to the fourth rule; wherein the fourth rule is divided into two steps. In the first step, the scheduling periods with high discharge prices are first considered, and then the scheduling periods with later discharge times are considered. The remaining scheduling periods after allocation are sorted in sequence, and the first 1 / 2 scheduling periods are selected; in the second step, the scheduling periods with low charging prices are first considered, and then the scheduling periods with earlier charging times are considered, and the remaining 1 / 2 scheduling periods in the first step are sorted; S222: Arrange the electric vehicles to charge and discharge according to the remaining and sorted scheduling time periods after allocation until the charging price is no higher than the discharging price.

8. The method for generating a charging and discharging strategy for an electric vehicle in a V2G mode according to claim 1, characterized in that: In the process of correcting the charging power, S2 includes: S23: Calculate the available charging capacity Q for electric vehicles in the area 充容 ; S24: Determine the available charging capacity Q 充容 Is it not less than the current required charging capacity Q of all electric vehicles in the area? 总充 ; S25: Determine that the corrected charging power is equal to the charging power of the electric vehicle generated in S1.

9. The method for generating a charging and discharging strategy for an electric vehicle in a V2G mode according to claim 8, characterized in that: S2 also includes: In Q 充容 <Q 总充 In the case of, then S26: Determine that the corrected charging power is equal to Q of the charging power of the electric vehicle generated in S1 充容 / Q 总充 times.

10. The method for generating a charging and discharging strategy for an electric vehicle in a V2G mode according to claim 1, characterized in that: In the process of correcting the discharge power, S2 includes: S27: Calculate the available discharge capacity Q of the area for electric vehicles 放容 ; S28: Determine the available discharge capacity Q 放容 Is it not less than the current required discharge capacity Q of all electric vehicles in the area? 总放 ; In Q 放容 ≥Q 总放 In the case of, then S29 is performed: determining that the corrected discharge power is equal to the discharge power of the electric vehicle generated in S1; In Q 放容 <Q 总放 In the case of, then S30 is performed: determine that the corrected discharge power is equal to the discharge power Q of the electric vehicle generated in S1 放容 / Q 总放 times.

Images