Method and system for calculating traction power supply capacity of electrified road

Abstract

The invention discloses a method and a system for calculating the traction power supply capability of an electrified road. The method comprises the following steps: acquiring data of a power supply specialty and data of a driving specialty; calculating traction power supply capacity related data of the electrified road by adopting an improved average volume method according to the load characteristics of the electrified road; judging whether the related data of the traction power supply capacity of the electrified road is within a preset range or not, if so, entering the step of storage, and if not, entering the step of adjustment; ending the calculation process of the traction power supply capacity related data of the electrified road, and storing the data of the corresponding power supply specialty and the data of the driving specialty into the traction power supply system of the electrified road; and adjusting the data of the power supply specialty and the data of the driving specialty until the data related to the traction power supply capability of the electrified road falls within a preset range.

Description

Technical Field

[0001] The present invention belongs to the field of power supply systems, and specifically relates to a calculation method and system for the traction power supply capacity of electrified roads. Background Art

[0002] An electrified road is a new type of transportation mode. By erecting an overhead catenary on the road, electrical energy is provided to the moving vehicles. The vehicle contacts the catenary through a pantograph to obtain power to drive the vehicle. This method realizes the high-quality integrated development of energy and transportation, providing a more environmentally friendly, energy-saving and efficient solution for road transportation.

[0003] The electrified road generally adopts a 1500V DC traction power supply system because this system is widely used in urban rail transit fields such as subways, and the technology is mature and reliable. There are various mature calculation methods for the traction power supply of subways, such as the average traffic volume method, the operation diagram method, and software systems developed using computer technology on this basis. However, there are significant differences in the traction load characteristics between electrified roads and subways. Subway trains operate strictly according to the pre-specified train operation diagram. At a certain moment in the train operation diagram, how many vehicles are in a power supply section, as well as the positions of each vehicle and whether they are drawing current are all determined. Therefore, the current drawing of trains on the traction network has strong regularity. While the road rights of electrified roads are open and shared, that is, electrified vehicles and other vehicles are allowed to mix, and at intersections, vehicles also need to pass or stop according to the instructions of traffic lights. Even when a traffic accident occurs, there may be vehicle congestion and queuing. Therefore, the randomness of vehicle current drawing on the traction network is relatively large. The traction power supply calculation methods and systems applicable to subways cannot be directly used for the traction power supply calculation of electrified roads. Summary of the Invention

[0004] In view of the problem that the existing subway traction power supply calculation method cannot adapt to the random current drawing of vehicles on the traction network, the present invention provides a calculation method and system for the traction power supply capacity of electrified roads.

[0005] To achieve the above technical objectives, the technical solutions adopted by the present invention are as follows:

[0006] A calculation method for the traction power supply capacity of an electrified road, comprising the steps of:

[0007] S1. Collect the data of the power supply specialty and the data of the train operation specialty;

[0008] S2. Calculate the relevant data of the traction power supply capacity of the electrified road by using the improved average traffic volume method according to the load characteristics of the electrified road;

[0009] S3. Determine whether the data related to the traction power supply capacity of the electrified road is within the preset range. If it is within the preset range, proceed to step S4; if not, proceed to step S5;

[0010] S4. End the calculation process of the data related to the traction power supply capacity of the electrified road, and save the data of the corresponding power supply specialty and the data of the train operation specialty to the traction power supply system of the electrified road;

[0011] S5. Adjust the data of the power supply specialty and the data of the train operation specialty until the data related to the traction power supply capacity of the electrified road falls within the preset range.

[0012] Further, the data of the power supply specialty includes the rated voltage of the traction network, the average distance of the power supply section, and the unit resistance of the traction network.

[0013] Further, the data of the train operation specialty includes the minimum vehicle spacing, vehicle mass, vehicle unit energy consumption, average vehicle running speed, and power taking time of the vehicle in the power supply section.

[0014] Further, the data related to the traction power supply capacity of the electrified road includes the average number of vehicles in the power supply section, the running time in the power supply section, the average vehicle current, the current interruption coefficient of the vehicle in the power supply section, the average current of the traction substation feeder, the effective current of the traction substation feeder, the average power loss of the traction network, the maximum average voltage loss, the effective current of the traction substation busbar, the power of the traction substation, and the capacity of the traction substation.

[0015] Further, the specific calculation formulas for the data related to the traction power supply capacity of the electrified road include:

[0016] Average number of vehicles in the power supply section:

[0017] m = L / s

[0018] In the formula, m is the average number of vehicles in the power supply section (vehicles), L is the average distance of the power supply section (km), and s is the minimum vehicle spacing (km);

[0019] Running time in the power supply section:

[0020] t = 60L / v

[0021] In the formula, t is the running time of the vehicle in the power supply section (min), and v is the average vehicle running speed (km / h);

[0022] Average vehicle current:

[0023] I = ΔAGv / Uc

[0024] Where I is the average current of the vehicle (A), ΔA is the unit energy consumption of the vehicle [kW·h / (t·km)], and G is the mass of the vehicle (t), including the self-weight and the cargo weight, U c is the rated voltage of the traction network (kV);

[0025] Current interruption coefficient of the vehicle in the power supply section:

[0026] α = t / t g

[0027] Where α is the current interruption coefficient of the vehicle in the power supply section, and t g is the power-taking time of the vehicle in the power supply section (min).

[0028] Average current of the feeder of the traction substation:

[0029] When double-sided power supply is adopted, I As = mI / 2, and when single-sided power supply is adopted, I Ad = mI

[0030] Where I As is the average current of the double-sided power supply feeder of the traction substation (A), and I Ad is the average current of the single-sided power supply feeder of the traction substation (A);

[0031] Effective current of the feeder of the traction substation:

[0032] When double-sided power supply is adopted:

[0033] I XAs 2 = I As 2 {1 + [1 + (1.33k x 2 – 1) / m]}

[0034] When single-sided power supply is adopted:

[0035] I XAd 2 = I Ad 2 {1 + [1 + (1.15α – 1) / m]}

[0036] Where I XAs is the effective current of the double-sided power supply feeder of the traction substation (A), and I XAd is the effective current of the single-sided power supply feeder of the traction substation (A), k x 2 is the effective coefficient, k x 2 = 1.15α;

[0037] Average power loss of the traction network:

[0038] When powered by both sides:

[0039] Δp d = I As 2 Lr / 3·[1 + (2k x 2 – 1) / m]

[0040] When powered by one side:

[0041] Δp d = I Ad 2 Lr / 3·[1 + (1.5k x 2 – 1) / m]

[0042] Where Δp d is the average power loss of the traction network (W), and r is the unit resistance of the traction network (Ω / km);

[0043] Maximum average voltage loss:

[0044] Occurs at the midpoint of the feeding area when powered by both sides:

[0045] Δu Dmax = I As Lr / 4·(1 + 1 / m)

[0046] Occurs at the end of the feeding area when powered by one side:

[0047] Δu Dmax = I Ad Lr / 2·(1 + 1 / m)

[0048] Effective current of the traction substation bus:

[0049] Assume that the traction substation has 4 feeder lines, which supply power to the left and right overhead contact lines for the up and down directions respectively,

[0050] I X 2 Σ = 4I XAs 2 + 12I As 2

[0051] Where I X Σ is the effective current of the traction substation bus (A);

[0052] Power of the traction substation:

[0053] PΣ = k c U c I X Σ

[0054] Wherein, PΣ is the power of the traction substation (kW), and k c is the increased coefficient of traction network loss, with a value of 1.05;

[0055] Traction substation capacity:

[0056] SΣ = 1.1PΣ

[0057] Wherein, SΣ is the capacity of the traction transformer (kVA).

[0058] Furthermore, the judgment criteria for whether the relevant data of the traction power supply capacity of the electrified road is within the preset range at least include whether the average number of single - line vehicles in the power supply section meets the traffic volume requirements, whether the maximum average voltage loss exceeds the specification requirements, and whether the capacity of the traction substation is reasonable.

[0059] Furthermore, the preset conditions of the improved average traffic volume method include:

[0060] The distribution of vehicles in the power supply section is uniform, the number of vehicles remains unchanged and is equal to the average number of vehicles;

[0061] Vehicles are moving on the road, and their relative positions are restricted by the agreed minimum vehicle spacing, that is, two vehicles cannot overlap;

[0062] The vehicle current varies arbitrarily in the power supply section, but the average vehicle current and effective current are unchanged. For a certain fixed power supply section, its energy consumption is fixed; the energy consumed to transport a certain weight of goods from the starting point to the end point of the power supply section at a certain speed is certain.

[0063] A calculation system for the traction power supply capacity of an electrified road includes a data acquisition module, a data input module, a calculation module for the traction power supply capacity of an electrified road, a judgment module, a data adjustment module, and a storage module;

[0064] The data acquisition module collects the data of the power supply specialty and the data of the train operation specialty;

[0065] The data input module inputs the data of the power supply specialty and the data of the train operation specialty through the web page text box;

[0066] The calculation module for the traction power supply capacity of an electrified road calculates the relevant data of the traction power supply capacity of an electrified road by using the corresponding improved average traffic volume method formula according to the data input through the web page text box;

[0067] The judgment module judges whether the relevant data of the traction power supply capacity of an electrified road is within the preset range;

[0068] A data adjustment module adjusts the data of the power supply specialty and the data of the train operation specialty when the data related to the traction power supply capacity of the electrified road is not within the preset range.

[0069] A storage module saves the corresponding data of the power supply specialty and the data of the train operation specialty to the electrified road traction power supply system when the data related to the traction power supply capacity of the electrified road is within the preset range.

[0070] Compared with the prior art, the present invention has the following beneficial effects:

[0071] From the perspective of reducing the randomness of vehicle current collection on the traction network, the present invention innovatively proposes two train operation organization strategies. One is that when the vehicle spacing is less than the minimum vehicle spacing, the vehicle is forced to be powered by the on-vehicle battery, and the other is that when the vehicle starts, the vehicle is forced to be powered by the on-vehicle battery. The above two strategies not only make the average traffic volume method applicable to the traction power supply calculation of electrified roads, but also can effectively control the construction cost and operation cost of the traction power supply system and improve the transportation efficiency of electrified roads.

[0072] The average traffic volume method commonly used in the traction power supply calculation of the subway project in the present invention is based on the same mathematical foundation, and some concepts and the values of related physical quantities are appropriately adjusted according to the traction load characteristics of the electrified road. Therefore, it can ensure that the accuracy of the calculation results is sufficient to meet the requirements of the preliminary feasibility study stage of the electrified road project and provide a solid and reliable data basis for the feasibility study of the project.

[0073] The calculation method and system of the present invention are convenient and fast to use. The calculation results can be seen in real time by inputting the data of the materials. Especially in the preliminary feasibility study stage of the electrified road project, when the data of the materials in the specialties such as train operation and power supply are still unstable, the present invention can be used for full trial calculations to ensure that no valuable solutions are missed, providing strong support for the scheme design and optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] Figure 1 It is a schematic flow chart of a calculation method for the traction power supply capacity of an electrified road according to the present invention;

[0075] Figure 2 It is a schematic diagram of the operation interface of the scheme data input web page of an embodiment of the present invention.

[0076] Figure 3 It is a schematic diagram of the feeder of a typical traction substation of an electrified road according to an embodiment of the present invention

[0077] Figure 4 It is a schematic diagram of the calculation result output table of an embodiment of the present invention.

[0078] Description of the markings in the figure: 1. DC feeder system of the traction substation on the electrified road; 2. Positive busbar; 3. Protection switch for the feeder line; 4. Upward catenary; 5. Downward catenary. Detailed implementation method

[0079] For the convenience of those skilled in the art to understand, the present invention will be further described below in conjunction with the embodiments and the accompanying drawings. The content mentioned in the implementation manner does not limit the present invention.

[0080] As Figure 1 shown, this embodiment provides a calculation method for the traction power supply capacity of an electrified road, including the steps of:

[0081] S1. Collect the data of the power supply specialty and the data of the train operation specialty;

[0082] S2. Calculate the relevant data of the traction power supply capacity of the electrified road by using the improved average traffic volume method according to the load characteristics of the electrified road;

[0083] S3. Judge whether the relevant data of the traction power supply capacity of the electrified road is within the preset range. If it is within the preset range, go to step S4; if it is not within the preset range, go to step S5;

[0084] S4. End the calculation process of the relevant data of the traction power supply capacity of the electrified road, and save the data of the power supply specialty and the data of the train operation specialty to the traction power supply system of the electrified road;

[0085] S5. Adjust the data of the power supply specialty and the data of the train operation specialty until the relevant data of the traction power supply capacity of the electrified road falls within the preset range.

[0086] The data of the power supply specialty includes the rated voltage of the traction network, the average distance of the power supply section, and the unit resistance of the traction network.

[0087] The data of the train operation specialty includes the minimum vehicle spacing, vehicle mass, vehicle unit energy consumption, vehicle average running speed, and vehicle power taking time in the power supply section.

[0088] The relevant data of the traction power supply capacity of the electrified road includes the average number of vehicles in the power supply section, the running time in the power supply section, the average vehicle current, the current interruption coefficient of the vehicle in the power supply section, the average current of the feeder of the traction substation, the effective current of the feeder of the traction substation, the average power loss of the traction network, the maximum average voltage loss, the effective current of the busbar of the traction substation, the power of the traction substation, and the capacity of the traction substation.

[0089] The schematic diagram of the feeder of the traction substation on the electrified road is as Figure 3 shown, as Figure 4As shown in the figure, the specific calculation formulas for the traction power supply capacity of the electrified road are as follows:

[0090] Average number of vehicles in the power supply section:

[0091] m = L / s = 4.5 / 0.5 = 9 (vehicles)

[0092] Where m is the average number of vehicles in the power supply section (vehicles), L is the average distance of the power supply section (km), and s is the minimum vehicle spacing (km);

[0093] Running time in the power supply section:

[0094] t = 60L / v = 60×4.5 / 60 = 4.5 (min)

[0095] Where t is the running time of the vehicle in the power supply section (min), and v is the average running speed of the vehicle (km / h);

[0096] Average vehicle current:

[0097] I = ΔAGv / U c = 0.055×50×60 / 1.5 = 110 (A)

[0098] Where I is the average vehicle current (A), ΔA is the unit energy consumption of the vehicle [kW·h / (t·km)], a key parameter calculated by the average traffic volume method, generally provided by automobile manufacturers, which depends on multiple factors, including the motor efficiency, conversion efficiency, air resistance, rolling resistance of the vehicle, etc., as well as the slope and curve radius of the road. G is the vehicle mass (t). Including self-weight and cargo weight, U c is the rated voltage of the traction network (kV);

[0099] Current interruption coefficient of the vehicle in the power supply section:

[0100] α = t / t g = 4.5 / 3 = 1.5

[0101] Where α is the current interruption coefficient of the vehicle in the power supply section, t g is the power taking time of the vehicle in the power supply section (min).

[0102] Average current of the feeder of the traction substation:

[0103] When double-sided power supply is adopted, I As = mI / 2 = 9×110 / 2 = 495 (A), when single-sided power supply is adopted, I Ad = mI = 9×110 = 990 (A);

[0104] Where I As is the average current of the double-sided power supply feeder of the traction substation (A), IAd is the average current (A) of the single-sided power supply feeder of the traction substation;

[0105] Effective current of the traction substation feeder:

[0106] When double-sided power supply:

[0107] I XAs 2 = I As 2 {1 + [1 + (1.33k x 2 – 1) / m]}

[0108] = 4952 × {1 + [1 + (1.33 × 1.15 × 1.5 – 1) / 9]}

[0109] = 555 (A)

[0110] When single-sided power supply:

[0111] I XAd 2 = I Ad 2 {1 + [1 + (1.15α – 1) / m]}

[0112] = 990 2 × {1 + [1 + (1.15 × 1.15 × 1.5 – 1) / 9]}

[0113] = 1081 (A)

[0114] In the formula, I XAs is the effective current (A) of the double-sided power supply feeder of the traction substation, I XAd is the effective current (A) of the single-sided power supply feeder of the traction substation, k x 2 is the effective coefficient, k x 2 = 1.15α;

[0115] Average power loss of the traction network:

[0116] When double-sided power supply:

[0117] Δp d = I As 2 Lr / 3 · [1 + (2k x 2 – 1) / m]

[0118] = 555 2 × 4.5 × 0.025 / 3 × [1 + (2 × 1.15 × 1.5 – 1) / 9]

[0119] = 11.7 (kW)

[0120] When single-sided power supply is adopted:

[0121] Δp d = I Ad 2 Lr / 3 · [1 + (1.5k x 2 – 1) / m]

[0122] = 1081 2 × 4.5 × 0.025 / 3 × [1 + (1.5 × 1.15 × 1.5 – 1) / 9]

[0123] = 43.2 (kW)

[0124] In the formula, Δp d is the average power loss of the traction network (W), and r is the unit resistance of the traction network (Ω / km);

[0125] The maximum average voltage loss:

[0126] When double-sided power supply is adopted, it occurs at the midpoint of the feeding area:

[0127] Δu Dmax = I As Lr / 4 · (1 + 1 / m)

[0128] When single-sided power supply is adopted, it occurs at the end of the feeding area:

[0129] Δu Dmax = I Ad Lr / 2 · (1 + 1 / m)

[0130] The effective current of the traction substation busbar:

[0131] Assume that the traction substation has 4 feeder lines, which supply power to the left and right overhead catenaries of the up and down lines respectively,

[0132] I X 2 Σ = 4I XAs 2 + 12I As 2

[0133] = (4 × 555 2 × 12 × 495 2 ) 1 / 2

[0134] = 2220 (A)

[0135] In the formula, I X Σ is the effective current of the traction substation busbar (A);

[0136] Power of traction substation:

[0137] PΣ = k c U c I X Σ

[0138] = 1.05 × 1.5 × 2220

[0139] = 3497 (kW)

[0140] In the formula, PΣ is the power of the traction substation (kW), and k c is the coefficient for increasing traction network loss, with a value of 1.05;

[0141] Capacity of traction substation:

[0142] SΣ = 1.1PΣ = 1.1 × 3497 = 3847 (kVA)

[0143] In the formula, SΣ is the capacity of the traction transformer (kVA).

[0144] The judgment criteria for whether the relevant data of the traction power supply capacity of the electrified road are within the preset range at least include whether the average number of single - line vehicles in the power supply section meets the traffic volume requirements, whether the maximum average voltage loss exceeds the specification requirements, and whether the capacity of the traction substation is reasonable.

[0145] The preset conditions of the improved average traffic volume method include:

[0146] The distribution of vehicles in the power supply section is uniform, the number of vehicles remains unchanged and is equal to the average number of vehicles;

[0147] Vehicles are moving on the road, and their relative positions are restricted by the agreed minimum vehicle spacing, that is, two vehicles cannot overlap;

[0148] The vehicle current changes arbitrarily in the power supply section, but the average vehicle current and effective current remain unchanged. For a certain fixed power supply section, its energy consumption is fixed; the energy consumed to transport a certain weight of goods from the starting point to the end point of the power supply section at a certain speed is certain.

[0149] A calculation system for the traction power supply capacity of an electrified road includes a data acquisition module, a data input module, a calculation module for the traction power supply capacity of the electrified road, a judgment module, a data adjustment module, and a storage module;

[0150] The data acquisition module acquires the data of the power supply specialty and the data of the train operation specialty;

[0151] As Figure 2 shown, the data input module inputs the data of the power supply specialty and the data of the train operation specialty through the web page text box;

[0152] The electrified road traction power supply capacity calculation module calculates the relevant data of the electrified road traction power supply capacity according to the data input in the web text box by using the corresponding improved average traffic volume method formula;

[0153] The judgment module judges whether the relevant data of the electrified road traction power supply capacity is within the preset range;

[0154] The data adjustment module adjusts the data of the power supply specialty and the data of the train operation specialty when the relevant data of the electrified road traction power supply capacity is not within the preset range;

[0155] The storage module saves the corresponding data of the power supply specialty and the data of the train operation specialty to the electrified road traction power supply system when the relevant data of the electrified road traction power supply capacity is within the preset range.

[0156] Compared with the prior art, the present invention has the following beneficial effects:

[0157] From the perspective of reducing the randomness of vehicle current collection on the traction network, the present invention innovatively proposes two train operation organization strategies. One is that when the vehicle spacing is less than the minimum vehicle spacing, the vehicle is forced to be powered by the on-vehicle battery, and the other is that when the vehicle starts, it is forced to be powered by the on-vehicle battery. The above two strategies not only make the average traffic volume method applicable to the traction power supply calculation of electrified roads, but also can effectively control the construction cost and operation cost of the traction power supply system and improve the transportation efficiency of electrified roads.

[0158] The average traffic volume method commonly used in the traction power supply calculation of the subway project in the present invention is based on the same mathematical basis, and some concepts and the values of related physical quantities are appropriately adjusted according to the traction load characteristics of the electrified road. Therefore, it can ensure that the accuracy of the calculation results is sufficient to meet the requirements of the preliminary feasibility study stage of the electrified road project and provide a solid and reliable data basis for the feasibility study of the project.

[0159] The calculation method and system of the present invention are convenient and fast to use. The calculation results can be seen in real time by inputting the data of the materials. Especially in the preliminary feasibility study stage of the electrified road project, when the data of the materials in the specialties of train operation and power supply are still unstable, the present invention can be used for full trial calculations to ensure that no valuable solutions are missed, providing strong support for the scheme design and optimization.

[0160] The above has introduced in detail a calculation method and system for the traction power supply capacity of an electrified road provided by this application. The description of specific embodiments is only used to help understand the method and its core idea of this application. It should be noted that for those of ordinary skill in the art, without departing from the principle of this application, several improvements and modifications can still be made to this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A method for calculating the traction power supply capacity of an electrified highway, characterized in that: Includes steps: S1. Collect data on power supply and driving; S2. According to the load characteristics of electrified roads, the improved average transport capacity method is used to calculate the relevant data of traction power supply capacity of electrified roads; S3, judging whether the data related to the traction power supply capacity of the electrified highway is within a preset range, if it is within the preset range, proceeding to step S4, if not within the preset range, proceeding to step S5; S4, ending the calculation process of data related to the traction power supply capacity of the electrified highway, and saving the data of the corresponding power supply and driving professions to the traction power supply system of the electrified highway; S5. Adjust the data of power supply and driving until the data related to the traction power supply capacity of the electrified highway falls within the preset range.

2. The method for calculating the traction power supply capacity of an electrified highway according to claim 1, characterized in that: The data of power supply include the rated voltage of traction network, the average distance of power supply section and the unit resistance of traction network.

3. The method for calculating the traction power supply capacity of an electrified highway according to claim 2, characterized in that: Professional driving data include minimum vehicle spacing, vehicle mass, vehicle unit energy consumption, vehicle average operating speed and vehicle power supply time in the power supply range.

4. The method for calculating the traction power supply capacity of an electrified highway according to claim 3, characterized in that: The data related to the traction power supply capacity of electrified roads include the average number of vehicles in the power supply section, the traveling time in the power supply section, the average current of vehicles, the current interruption coefficient of vehicles in the power supply section, the average current of traction substation feeders, the effective current of traction substation feeders, the average power loss of the traction network, the maximum average voltage loss, the effective current of the traction substation bus, the traction substation power and the traction substation capacity.

5. The method for calculating the traction power supply capacity of an electrified highway according to claim 4, characterized in that: The specific calculation formulas for the data related to the traction power supply capacity of electrified roads include: Average number of vehicles in the power supply area: m=L / s Where m is the average number of vehicles in the power supply interval (vehicles), L is the average distance between power supply intervals (km), and s is the minimum vehicle spacing (km); Travel time in the power supply area: t=60L / v Where t is the travel time of the vehicle in the power supply section (min), and v is the average running speed of the vehicle (km / h); Average vehicle current: I=ΔAGv / Uc Where I is the average current of the vehicle (A), ΔA is the specific energy consumption of the vehicle [kW·h / (t·km)], G is the mass of the vehicle (t), including its own weight and the weight of the cargo, and U is c is the rated voltage of the traction network (kV); Current discontinuity coefficient of the vehicle in the power supply section: α=t / t g Where α is the current discontinuity coefficient of the vehicle in the power supply section, t g It is the time (min) that the vehicle draws power in the power supply area. Average current of traction substation feeder: When the power supply is on both sides As =mI / 2, when single-side power supply is used, I Ad =mI Where I As is the average current of the bilateral power supply feeder of the traction substation (A), I Ad is the average current of the single-side power supply feeder of the traction substation (A); Effective current of traction substation feeder: When power is supplied from both sides: I XAs 2 =I As 2 {1+[1+(1.33k x 2 –1) / m]} When single-side power supply is used: I XAd 2 =I Ad 2 {1+[1+(1.15α–1) / m]} Where I XAs is the effective current of the bilateral power supply feeder of the traction substation (A), I XAd is the effective current of the single-side feeder of the traction substation (A), k x 2 is the effective coefficient, k x 2 =1.15α; Average power loss of traction network: When power is supplied from both sides: Δp d =I As 2 Lr / 3·[1+(2k x 2 –1) / m] When single-side power supply is used: Δp d =I Ad 2 Lr / 3·[1+(1.5k x 2 –1) / m] Where Δp d is the average power loss of the traction network (W), r is the unit resistance of the traction network (Ω / km); Maximum average voltage loss: Bilateral power supply occurs at the midpoint of the feeding area: Δu Dmax =I As Lr / 4·(1+1 / m) Single-sided power supply occurs at the end of the feeding area: Δu Dmax =I Ad Lr / 2·(1+1 / m) Effective current of traction substation busbar: The traction substation has 4 feeders, which are used to supply power to the left up and down lines and the right up and down lines. I X 2 Σ=4I XAs 2 +12I As 2 Where I X Σ is the effective current of the traction substation busbar (A); Traction substation power: PΣ=k c IN c AND X Σ Where PΣ is the power of the traction substation (kW), k c is the traction network loss increase coefficient, which takes a value of 1.05; Traction substation capacity: SΣ=1.1PΣ Where SΣ is the traction transformer capacity (kVA).

6. The method for calculating the traction power supply capacity of an electrified highway according to claim 5, characterized in that: The criteria for judging whether the data related to the traction power supply capacity of electrified roads are within the preset range include at least whether the average number of vehicles in a single line in the power supply section meets the transport volume requirements, whether the maximum average voltage loss exceeds the regulatory requirements, and whether the capacity of the traction substation is reasonable.

7. The method for calculating the traction power supply capacity of an electrified highway according to claim 6, characterized in that: The improved average traffic volume method pre-conditions include: The distribution of vehicles in the power supply area is uniform, the number of vehicles remains constant and equal to the average number of vehicles; On the road, vehicles are in motion, and their relative positions are restricted by the agreed minimum vehicle spacing, i.e. two vehicles cannot overlap; The vehicle current changes arbitrarily within the power supply range, but the vehicle average current and effective current remain unchanged. For a fixed power supply range, its energy consumption is fixed; the energy consumed to transport a certain weight of goods from the starting point to the end point of the power supply range at a certain speed is fixed.

8. A system for calculating the traction power supply capacity of an electrified highway, characterized in that: It includes a data acquisition module, a data input module, an electrified highway traction power supply capacity calculation module, a judgment module, a data adjustment module and a storage module; Data acquisition module, which collects data on power supply and driving; The data input module inputs the data of power supply and driving into the text box of the web page; The module for calculating the traction power supply capacity of the electrified highway uses the corresponding improved average transport volume method formula to calculate the relevant data of the traction power supply capacity of the electrified highway according to the data input in the text box of the web page; A judgment module, for judging whether data related to the traction power supply capacity of the electrified highway is within a preset range; The data adjustment module adjusts the data of power supply and driving if the data related to the traction power supply capacity of the electrified highway is not within the preset range; The storage module stores the data related to the traction power supply capacity of the electrified highway within a preset range, and saves the data corresponding to the power supply and driving profession into the traction power supply system of the electrified highway.

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