Model selection method and system of photovoltaic power supply output line lead and storage medium

Abstract

The invention discloses a model selection method and system for a photovoltaic power supply sending-out line wire and a storage medium. The method comprises the steps of obtaining comprehensive parameter data of a target photovoltaic power supply project; based on the comprehensive parameter data of the target photovoltaic power supply project, calculating single-phase current values needing to be sent out by the photovoltaic power supply at different environment temperatures to obtain a single-phase current value table; based on the single-phase current values needing to be sent out by the photovoltaic power supply under different environment temperatures in the single-phase current value table, a plurality of alternative wires meeting the current-carrying capacity requirement are determined, and the total resistance of the sending-out lines corresponding to the plurality of alternative wires is obtained; based on the total resistance of the sending-out lines corresponding to the plurality of alternative wires and the comprehensive parameter data of the target photovoltaic power supply project, calculating the annual average cost of the sending-out lines corresponding to the plurality of alternative wires; the reduction effect of the environment temperature on the output of the photovoltaic power station and the current-carrying capacity of the wire can be considered synchronously, so that the model selection of the wire is more economical and reasonable.

Description

Technical Field

[0001] The present invention belongs to the technical field of power transmission engineering design, and particularly relates to a method, a system and a storage medium for selecting conductors of a photovoltaic power output line. Background Art

[0002] With the continuous progress and wide application of new energy technologies, the installed capacity of photovoltaic power stations in China has shown a significant growth trend, and the corresponding demand for supporting construction of output lines has become increasingly prominent. As one of the key factors affecting the current-carrying capacity of conductors in output lines, the change of ambient temperature has a significant impact on the safe operation and economy of the lines. Specifically, when the ambient temperature rises, the current-carrying capacity of the conductors decreases accordingly. At the same time, the power generation efficiency of photovoltaic modules (solar panels) is also significantly restricted by the temperature effect, that is, the increase in temperature will lead to a decrease in the photovoltaic conversion efficiency, thereby affecting the overall output power of the photovoltaic power station.

[0003] In the traditional design of selecting conductors for photovoltaic power station output lines, the rated installed capacity of the photovoltaic power station is usually used as the core design input parameter, and based on this, the conductor specifications are selected and checked to ensure that under the preset ambient temperature conditions, the current-carrying capacity of the conductors can meet the power transmission requirements under the full-load operation state of the photovoltaic power station. However, this design method does not fully consider the dynamic impact of ambient temperature on the actual output power of the photovoltaic power station. That is, in a high-temperature environment, the actual output of the photovoltaic power station will be lower than its rated installed capacity. If the conductor selection is still based on the full-load state, it may lead to an oversized selection of the conductor cross-section, resulting in unnecessary material waste and increased investment costs, and affecting the overall economy of the project. Summary of the Invention

[0004] The purpose of the present invention is to provide a method, a system and a storage medium for selecting conductors of a photovoltaic power output line, which can achieve more economical and reasonable conductor selection.

[0005] To achieve the above purpose, the present invention is implemented by adopting the following technical solutions:

[0006] In the first aspect, the present invention provides a method for selecting conductors of a photovoltaic power output line, including:

[0007] Obtaining comprehensive parameter data of a target photovoltaic power project;

[0008] Based on the comprehensive parameter data of the target photovoltaic power project, calculating the single-phase current values required to be output by the photovoltaic power at different ambient temperatures to obtain a single-phase current value table;

[0009] Based on the single-phase current values required to be output by the photovoltaic power at different ambient temperatures in the single-phase current value table, determining a number of alternative conductors that meet the current-carrying capacity requirements, and obtaining the total resistance of the output lines corresponding to the number of alternative conductors;

[0010] Based on the total resistance of the outgoing lines corresponding to several alternative conductors and the comprehensive parameter data of the target photovoltaic power source project, calculate the annual average cost of the outgoing lines corresponding to several alternative conductors;

[0011] Take the alternative conductor corresponding to the minimum annual average cost as the recommended conductor.

[0012] Optionally, the comprehensive parameter data of the target photovoltaic power source project includes: installed capacity of photovoltaic panels, maximum load loss hours, on-grid electricity price, rated voltage of outgoing line, number of outgoing line loops, conductor split number of outgoing line, number of towers per kilometer of outgoing line, proportion of strain towers in outgoing line, engineering investment recovery rate of outgoing line, annual investment ratio, service life, temperature characteristic coefficient of photovoltaic panels, environmental condition data of outgoing line, and line maintenance rate; among them, the environmental condition data of the outgoing line includes the basic wind speed, ice coating thickness, and geological conditions of the area where the outgoing line is located.

[0013] Optionally, based on the comprehensive parameter data of the target photovoltaic power source project, calculate the single-phase current values required for the photovoltaic power source to be sent out at different ambient temperatures, and obtain a single-phase current value table, where the calculation formula for the single-phase current value is expressed as follows:

[0014] ;

[0015] Among them, I0 represents the single-phase flow; represents the installed capacity of photovoltaic panels; represents the temperature characteristic coefficient of photovoltaic panels, which varies according to the ambient temperature; V e represents the rated voltage of the outgoing line;

[0016] Among them, the single-phase current value table includes different ambient temperatures increasing in steps of S, and the single-phase current values required for the photovoltaic power source to be sent out at different ambient temperatures, and the range of the ambient temperature is determined according to the area where the outgoing line is located.

[0017] Optionally, based on the single-phase current values required for the photovoltaic power source to be sent out at different ambient temperatures in the single-phase current value table, determine several alternative conductors that meet the current-carrying capacity requirements, including:

[0018] Determine the initial ambient temperature according to the maximum value of the single-phase current in the single-phase current table, and select several conductors that meet the current-carrying capacity requirements at the initial ambient temperature as the initial alternative conductors;

[0019] Based on the single-phase current values required for the photovoltaic power source to be sent out at different ambient temperatures in the single-phase current table, judge whether the initial alternative conductors meet the current-carrying capacity requirements at the first ambient temperature, and eliminate the initial alternative conductors that do not meet the requirements to obtain several alternative conductors; where the first ambient temperature is greater than the initial ambient temperature.

[0020] Optionally, determining the initial ambient temperature according to the maximum value of the single-phase current in the single-phase ammeter, and selecting several wires that meet the current-carrying capacity requirements at the initial ambient temperature as the initial alternative wires, includes:

[0021] Selecting the ambient temperature corresponding to the maximum single-phase current value in the single-phase ammeter as the initial ambient temperature;

[0022] Obtaining the current-carrying capacity of the wire at the initial ambient temperature;

[0023] If the current-carrying capacity of the wire at the initial ambient temperature is not less than the maximum single-phase current value in the single-phase ammeter, then the wire meets the current-carrying capacity requirements at the initial ambient temperature;

[0024] Selecting several wires that meet the current-carrying capacity requirements at the initial ambient temperature as the initial alternative wires.

[0025] Optionally, based on the single-phase current values that the photovoltaic power source needs to send out at different ambient temperatures in the single-phase ammeter, determining whether the initial alternative wires meet the current-carrying capacity requirements at the first ambient temperature, and eliminating the initial alternative wires that do not meet the requirements to obtain several alternative wires, specifically including:

[0026] S01: Based on the initial ambient temperature, taking the step S as the increment to obtain the first ambient temperature;

[0027] S02: Obtaining the current-carrying capacity of the initial alternative wires at the first ambient temperature;

[0028] S03: Comparing whether the current-carrying capacity of the initial alternative wires at the first ambient temperature is greater than or equal to the single-phase current value at the first ambient temperature in the single-phase current value table;

[0029] S04: If it is greater than or equal to, then determining that the initial alternative wire meets the current-carrying capacity requirements at the first ambient temperature, and replacing the initial ambient temperature with the first ambient temperature to repeat steps S01 - S03 until the first ambient temperature reaches the maximum value of the ambient temperature in the single-phase current value table;

[0030] If it is less than, then determining that the initial alternative wire does not meet the current-carrying capacity requirements at the first ambient temperature, and eliminating the initial alternative wire;

[0031] S05: Based on the above steps S01 - S04, obtaining several initial alternative wires that are not eliminated;

[0032] S06: Taking the several initial alternative wires that are not eliminated as several alternative wires.

[0033] Optionally, calculating the annual average cost of the outgoing lines corresponding to several alternative wires based on the total resistance of the outgoing lines corresponding to several alternative wires and the comprehensive parameter data of the target photovoltaic power source project, includes:

[0034] Based on the data of the outgoing line environmental conditions and the number of outgoing line circuits, the number of conductor splits of the outgoing line, the number of towers per kilometer of the outgoing line, and the proportion of strain towers in the outgoing line in the comprehensive parameter data, the investment cost per kilometer of the body of the outgoing line is obtained;

[0035] According to the investment cost per kilometer of the body of the outgoing line and the line maintenance rate, calculate the annual maintenance cost per kilometer of the outgoing line;

[0036] Based on the total resistance of the outgoing line corresponding to several alternative conductors, the rated current of the photovoltaic power supply output, the maximum load loss hours, and the on-grid electricity price, calculate the annual loss cost per kilometer of the outgoing line corresponding to several alternative conductors; among them, the rated current of the photovoltaic power supply output is calculated from the installed capacity of the photovoltaic panel and the rated voltage of the outgoing line in the comprehensive parameter data;

[0037] According to the investment cost per kilometer of the body of the outgoing line, the annual maintenance cost per kilometer, the annual loss cost per kilometer of the outgoing line corresponding to several alternative conductors, and the comprehensive parameter data, calculate the annual average cost of the outgoing line corresponding to several alternative conductors.

[0038] Optionally, the calculation formula for the annual average cost of the outgoing line corresponding to a certain alternative conductor is expressed as follows:

[0039] ;

[0040] Among them, NF represents the annual average cost; Z represents the total project investment cost after conversion; r0 represents the investment recovery rate of the outgoing line project; n represents the service life; represents the annual operating cost after conversion;

[0041] Among them, ;

[0042] ;

[0043] In the formula, m represents the number of construction years; Z t represents the construction investment cost in the t-th year; Z s represents the investment cost per kilometer of the body; K t represents the investment ratio in the t-th year; t represents the sequence number;

[0044] Among them, ;

[0045] ;

[0046] In the formula, represents the annual operating cost per kilometer; represents the annual maintenance cost per kilometer; It represents the annual loss cost per kilometer of the outgoing line corresponding to a certain alternative conductor; t0 represents the year when part of the project is put into production.

[0047] In a second aspect, a system for selecting conductors for a photovoltaic power supply outgoing line includes:

[0048] A data acquisition module for acquiring comprehensive parameter data of a target photovoltaic power supply project;

[0049] A single-phase current module for calculating the single-phase current value required for the photovoltaic power supply to be sent out at different ambient temperatures based on the comprehensive parameter data of the target photovoltaic power supply project, and obtaining a single-phase current value table;

[0050] A conductor screening module for determining a number of alternative conductors that meet the current-carrying capacity requirements based on the single-phase current values required for the photovoltaic power supply to be sent out at different ambient temperatures in the single-phase current value table, and obtaining the total resistance of the outgoing lines corresponding to the number of alternative conductors;

[0051] An annual average cost calculation module for calculating the annual average cost of the outgoing lines corresponding to a number of alternative conductors based on the total resistance of the outgoing lines corresponding to the number of alternative conductors and the comprehensive parameter data of the target photovoltaic power supply project;

[0052] A conductor determination module for using the alternative conductor corresponding to the minimum annual average cost as the recommended conductor.

[0053] In a third aspect, the present invention provides a computer-readable storage medium storing a computer program, and when the computer program is executed, it implements the method for selecting conductors for a photovoltaic power supply outgoing line described in the first aspect of the claims.

[0054] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0055] The present invention provides a method, a system, and a storage medium for selecting conductors for a photovoltaic power supply outgoing line. The method first calculates the single-phase current values required for the photovoltaic power supply to be sent out at different ambient temperatures, and uses this to screen conductors that meet the current-carrying capacity requirements to obtain a number of alternative conductors; then calculates the annual average cost of the outgoing lines corresponding to the number of alternative conductors, so as to use the alternative conductor with the minimum annual average cost as the recommended conductor, which can synchronously consider the reduction effect of ambient temperature on the output of the photovoltaic power station and the current-carrying capacity of the conductor, making the conductor selection more economical and reasonable. Among them, the reduction effect refers to the phenomenon that when the ambient temperature rises, both the power generation capacity of the photovoltaic power station and the current-carrying capacity of the conductor decrease. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 The figure shows a schematic flowchart of a method for selecting conductors for a photovoltaic power supply outgoing line in an embodiment of the present invention;

[0057] Figure 2The following is a schematic flow diagram for further screening of a single initial alternative wire in an embodiment of the present invention. Detailed implementation manners

[0058] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the protection scope of the present invention.

[0059] Embodiment 1

[0060] As Figure 1 shown, an embodiment of the present invention introduces a method for selecting a wire for a photovoltaic power output line, including the following steps:

[0061] S1: Obtain the comprehensive parameter data of the target photovoltaic power project;

[0062] S2: Based on the comprehensive parameter data of the target photovoltaic power project, calculate the single-phase current values required for the photovoltaic power to be output at different ambient temperatures, and obtain a single-phase current value table;

[0063] S3: Based on the single-phase current values required for the photovoltaic power to be output at different ambient temperatures in the single-phase current value table, determine several alternative wires that meet the current-carrying capacity requirements, and obtain the total resistance of the outgoing lines corresponding to the several alternative wires;

[0064] S4: Based on the total resistance of the outgoing lines corresponding to the several alternative wires and the comprehensive parameter data of the target photovoltaic power project, calculate the annual average cost of the outgoing lines corresponding to the several alternative wires;

[0065] S5: Use the alternative wire corresponding to the minimum annual average cost as the recommended wire.

[0066] This embodiment provides a method for selecting a wire for a photovoltaic power output line. First, calculate the single-phase current values required for the photovoltaic power to be output at different ambient temperatures, and use this to screen wires that meet the current-carrying capacity requirements to obtain several alternative wires; then calculate the annual average cost of the outgoing lines corresponding to the several alternative wires, so as to use the alternative wire with the minimum annual average cost as the recommended wire, which can simultaneously consider the reduction effects of ambient temperature on the output of the photovoltaic power station and the current-carrying capacity of the wire, making the wire selection more economical and reasonable.

[0067] In this embodiment, in step S1, comprehensive parameter data of the target photovoltaic power project is obtained, including: according to the planning and design of the target photovoltaic power project, directly obtaining the installed capacity of photovoltaic panels, the maximum load loss hours, the on-grid electricity price, the rated voltage of the outgoing line, the number of outgoing line circuits, the conductor split number of the outgoing line, the number of towers per kilometer of the outgoing line, the proportion of strain towers in the outgoing line, the engineering investment recovery rate of the outgoing line, the annual investment ratio, the service life, the temperature characteristic coefficient of the photovoltaic panel, the environmental condition data of the outgoing line, and the line maintenance rate; among them, the environmental condition data of the outgoing line includes the basic wind speed, ice coating thickness, and geological conditions of the area where the outgoing line is located. Among them: The installed capacity of the photovoltaic panel generally needs to be determined by combining the number of photovoltaic panels, the selection of photovoltaic panels (such as 550Wp components), the array layout (tilt angle, spacing), and shadow occlusion analysis in the target photovoltaic power project. In this embodiment, the installed capacity of the photovoltaic panel directly obtained is 200MVA. Specifically, the specific contents in the above comprehensive parameter data are all calculated or directly obtained by those skilled in the art according to the planning and design of the target photovoltaic power project, and are all calculations of existing formulas. The specific calculation steps are not elaborated here.

[0068] In this embodiment, in step S2, based on the comprehensive parameter data of the target photovoltaic power project, the single-phase current value required for the photovoltaic power to be sent out at different ambient temperatures is calculated to obtain a single-phase current value table, where the calculation formula of the single-phase current value is expressed as follows:

[0069] ;

[0070] Among them, I0 represents the single-phase flow rate; represents the installed capacity of the photovoltaic panel; represents the temperature characteristic coefficient of the photovoltaic panel, which varies according to the magnitude of the ambient temperature; V e represents the rated voltage of the outgoing line;

[0071] Among them, the single-phase current table includes different ambient temperatures increasing in steps of S, and the single-phase current values required for the photovoltaic power to be sent out at different ambient temperatures. The range of the ambient temperature is determined according to the area where the outgoing line is located; it also includes the photovoltaic temperature characteristic coefficient and the actual output corresponding to different ambient temperatures;

[0072] Specifically, based on the comprehensive parameter data obtained in step S1, the step size S = 10°C is set, and the single-phase current values sent out by the photovoltaic power at different ambient temperatures of a 200MVA photovoltaic power station (photovoltaic panel installation) are calculated, so as to obtain a single-phase current value table B as shown in the following table:

[0073]

[0074] It can be seen from this table that the maximum current is 994.48A, and the corresponding ambient temperature is 10°C.

[0075] In this embodiment, in step S3, based on the single-phase current values that the photovoltaic power supply needs to output at different ambient temperatures in the single-phase current value table, several alternative wires that meet the current-carrying capacity requirements are determined, including:

[0076] S31: Determine the initial ambient temperature according to the maximum value of the single-phase current in the single-phase ammeter, and select several wires that meet the current-carrying capacity requirements at the initial ambient temperature as the initial alternative wires;

[0077] S32: Based on the single-phase current values that the photovoltaic power supply needs to output at different ambient temperatures in the single-phase ammeter, determine whether the initial alternative wires meet the current-carrying capacity requirements at the first ambient temperature, and eliminate the initial alternative wires that do not meet the requirements to obtain several alternative wires; where the first ambient temperature is greater than the initial ambient temperature.

[0078] Specifically, the steps of selecting the initial alternative wires in step S31 include:

[0079] S311: Select the ambient temperature corresponding to the maximum single-phase current value in the single-phase ammeter as the initial ambient temperature;

[0080] S312: Obtain the current-carrying capacity of the wire at the initial ambient temperature;

[0081] S313: If the current-carrying capacity of the wire at the initial ambient temperature is not less than the maximum single-phase current value in the single-phase ammeter, then the wire meets the current-carrying capacity requirements at the initial ambient temperature;

[0082] S314: Select several wires that meet the current-carrying capacity requirements at the initial ambient temperature as the initial alternative wires.

[0083] Specifically, based on the maximum single-phase current value in the single-phase current value table B, several types of wires that meet the current-carrying capacity requirements at the corresponding ambient temperature among the existing wires are selected as the initial alternative wires. Specifically, the following wire types are 1×JL / G1A-400 / 35, 2×JL / G1A-240 / 30, 2×JL / G1A-300 / 40, 2×JL / G1A-400 / 35, 1×JNRLH1 / LB20A-300 / 40, 1×JNRLH1 / LB20A-400 / 35, as shown in the following table:

[0084]

[0085] Specifically, step S32 is equivalent to further screening the initial alternative wires. As the step size S is superimposed, the first ambient temperature also gradually increases. Each of the initial alternative wires is judged one by one whether it meets the current-carrying capacity requirement at the first ambient temperature, and several final alternative wires are obtained. Among them, since the step size S is the same as the step size of the increase in ambient temperature in the single-phase current value table B, the change in the first ambient temperature corresponds one by one to the ambient temperature in the single-phase current value table B;

[0086] The detailed process is as follows:

[0087] S01: Based on the initial ambient temperature, use the step size S as the increment to obtain the first ambient temperature;

[0088] S02: Obtain the current-carrying capacity of the initial alternative wires at the first ambient temperature;

[0089] S03: Compare whether the current-carrying capacity of the initial alternative wires at the first ambient temperature is greater than or equal to the single-phase current value at the first ambient temperature in the single-phase current value table;

[0090] S04: If it is greater than or equal to, it is judged that the initial alternative wire meets the current-carrying capacity requirement at the first ambient temperature, and use the first ambient temperature to replace the initial ambient temperature and repeat steps S01 - S03 until the first ambient temperature reaches the maximum value of the ambient temperature in the single-phase current value table;

[0091] If it is less than, it is judged that the initial alternative wire does not meet the current-carrying capacity requirement at the first ambient temperature, and the initial alternative wire is eliminated;

[0092] S05: Based on the above steps S01 - S04, several initial alternative wires that are not eliminated are obtained;

[0093] S06: Use several initial alternative wires that are not eliminated as several alternative wires.

[0094] Specifically, the magnitude of the current-carrying capacity of the initial alternative wires at different ambient temperatures can be obtained from the technical manual of the initial alternative wires of a specific model;

[0095] Specifically, as Figure 2 shown, it is the step of further screening a single initial alternative wire, where Umax is the ambient temperature limit value, that is, in this embodiment, it is the maximum value 40° of the range of the ambient temperature in the single-phase current value table B;

[0096] Specifically, based on the preliminary candidate conductors screened in step S31, the allowable current of the 1×JL / G1A-400 / 35 conductor at an ambient temperature of 30°C is 840A. According to Table B, the required single-phase current value of the photovoltaic power station at an ambient temperature of 30°C is 883.9A. This conductor does not meet the requirement and is eliminated from the initial candidate conductors. The remaining 2×JL / G1A-240 / 30, 2×JL / G1A-300 / 40, 2×JL / G1A-400 / 35, 1×JNRLH1 / LB20A-300 / 40, and 1×JNRLH1 / LB20A-400 / 35 conductors remain as candidate conductors.

[0097] In this embodiment, in step S3, the total resistance of the transmission lines corresponding to the plurality of candidate conductors is obtained. The total resistance of the transmission line corresponding to a single candidate conductor is obtained as follows:

[0098] Obtain the length of the outgoing line in the target photovoltaic power project;

[0099] Obtain the resistance per unit length of the candidate wire;

[0100] The total resistance of the transmission line corresponding to the candidate wire is obtained based on the length of the transmission line and the resistance per unit length.

[0101] Among them, the resistance value per unit length of the alternative conductor is directly obtained in the present invention. The calculation method is to iteratively calculate the resistance value and current carrying capacity per meter of conductor at the allowable temperature based on the current carrying capacity calculation formula in GB50545-2010 "110kv~750kv Overhead Transmission Line Design Code", and finally obtain the resistance value per unit length that meets the preset current carrying capacity and ambient temperature. This calculation method is common knowledge among those skilled in the art and will not be described in detail here.

[0102] In this embodiment, in step S4, the annual average cost of the transmission lines corresponding to the candidate conductors is calculated based on the total resistance of the transmission lines corresponding to the candidate conductors and the comprehensive parameter data of the target photovoltaic power project, specifically including:

[0103] S41: Based on the transmission line environmental condition data and the number of transmission line loops, the number of transmission line conductor splits, the number of towers per kilometer of the transmission line, and the ratio of tension towers per kilometer of the transmission line in the comprehensive parameter data, the per-kilometer main body investment cost of the transmission line is obtained;

[0104] Specifically, the investment cost per kilometer consists of tower costs, foundation costs, and line costs, and the calculation method is as follows:

[0105] According to the conductor model, basic wind speed, ice thickness, and geological conditions, the typical tower weight t1 of a single-base straight tower and the typical tower weight t2 of a single-base tension tower, the foundation concrete volume and the tower weight ratio coefficient f are obtained. The tower cost per ton k is obtained based on the market information price.塔 , the cost of per cubic meter of concrete is k 基 , the cost of per kilometer of wire stringing is k 线 ;

[0106] The investment cost per kilometer of the main body is calculated by the tower cost formula as follows:

[0107]

[0108]

[0109]

[0110]

[0111] In the formula, Z S is the investment cost per kilometer of the main body; Z 塔 is the tower cost; Z 基 is the foundation cost; Z 线 is the wire stringing cost; m* is the number of towers per kilometer of the outgoing line; q is the proportion of strain towers in the outgoing line; a is the number of circuits of the outgoing line; b is the number of conductor splits of the outgoing line.

[0112] S42: Calculate the annual maintenance cost per kilometer of the outgoing line according to the investment cost per kilometer of the main body of the outgoing line and the line maintenance rate;

[0113] Specifically, the calculation formula of the annual maintenance cost per kilometer of the outgoing line is as follows:

[0114]

[0115] Among them, μ J is the annual maintenance cost per kilometer; Z s is the investment cost per kilometer of the main body (in ten thousand yuan); k is the line maintenance rate.

[0116] S42: Calculate the annual loss cost per kilometer of the outgoing line corresponding to several alternative conductors based on the total resistance of the outgoing line corresponding to the several alternative conductors, the rated current of the photovoltaic power supply output, the maximum load loss hours, and the on-grid electricity price;

[0117] Specifically, the calculation method of the annual loss cost per kilometer is as follows:

[0118]

[0119]

[0120] Among them, Q is the loss power per kilometer (kWh); I is the conductor current-carrying capacity (A); R is the total resistance of the conductor; τ is the maximum load loss hours (hours); μ Qis the annual loss cost per kilometer (in ten thousand yuan); s0 is the on-grid electricity price (in yuan / kWh).

[0121] Specifically, the rated current output of the photovoltaic power source is calculated from the installed capacity of the photovoltaic panels and the rated voltage of the output line in the comprehensive parameter data. The formula is as follows:

[0122]

[0123] Among them, I e represents the rated current; represents the installed capacity of the photovoltaic panels; V e represents the rated voltage of the output line.

[0124] S43: Calculate the annual average cost of the output line corresponding to several alternative conductors according to the investment cost per kilometer of the main body of the output line, the annual maintenance cost per kilometer, the annual loss cost per kilometer of the output line corresponding to several alternative conductors, and the comprehensive parameter data. Among them, the calculation formula for the annual average cost of the output line corresponding to a certain alternative conductor is as follows:

[0125] ;

[0126] Among them, NF represents the annual average cost; Z represents the total investment cost of the project after conversion; r0 represents the investment recovery rate of the output line project; n represents the service life; represents the annual operating cost after conversion;

[0127] Among them, ;

[0128] ;

[0129] In the formula, m represents the number of construction years; Z t represents the construction investment cost in the t-th year; Z s represents the investment cost per kilometer of the main body; K t represents the investment ratio in the t-th year; t represents the serial number;

[0130] Among them, ;

[0131] ;

[0132] In the formula, represents the annual operating cost per kilometer; represents the annual maintenance cost per kilometer; represents the annual loss cost per kilometer of the output line corresponding to a certain alternative conductor; t0 represents the year when the project is partially put into production.

[0133] Based on the above steps, the annual average costs of alternative conductor models 2×JL / G1A-240 / 30, 2×JL / G1A-300 / 40, 2×JL / G1A-400 / 35, 1×JNRLH1 / LB20A-300 / 40, and 1×JNRLH1 / LB20A-400 / 35 are shown in the following table:

[0134]

[0135] Among them, the annual cost of the 1×JNRLH1 / LB20A-400 / 35 conductor is 298,300 yuan / km, which is the lowest value among several alternative conductors. This conductor is used as the recommended conductor for conductor selection.

[0136] Embodiment 2

[0137] This embodiment provides a conductor selection system for a photovoltaic power output line, including:

[0138] A data acquisition module for acquiring comprehensive parameter data of a target photovoltaic power project;

[0139] A single-phase current module for calculating the single-phase current value required for the output of the photovoltaic power source at different ambient temperatures based on the comprehensive parameter data of the target photovoltaic power project to obtain a single-phase current value table;

[0140] A conductor screening module for determining several alternative conductors that meet the current-carrying capacity requirements based on the single-phase current values required for the output of the photovoltaic power source at different ambient temperatures in the single-phase current value table, and obtaining the total resistance of the output lines corresponding to the several alternative conductors;

[0141] An annual average cost calculation module for calculating the annual average costs of the output lines corresponding to the several alternative conductors based on the total resistance of the output lines corresponding to the several alternative conductors and the comprehensive parameter data of the target photovoltaic power project;

[0142] A conductor determination module for using the alternative conductor corresponding to the minimum annual average cost as the recommended conductor.

[0143] Embodiment 3

[0144] This embodiment provides a computer-readable storage medium storing a computer program, and when the computer program is executed, it implements the conductor selection method for the photovoltaic power output line described in Claim Embodiment 1.

[0145] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0146] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0147] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implement the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0148] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the spirit and scope protected by the present invention and the claims. All of these fall within the protection scope of the present invention.

Claims

1. A method for selecting conductors of a photovoltaic power output line, characterized in that, Including: Obtain the comprehensive parameter data of the target photovoltaic power source project; Based on the comprehensive parameter data of the target photovoltaic power source project, calculate the single-phase current values that the photovoltaic power source needs to output at different ambient temperatures, and obtain a single-phase current value table; Based on the single-phase current values that the photovoltaic power source needs to output at different ambient temperatures in the single-phase current value table, determine several alternative conductors that meet the ampacity requirements, and obtain the total resistance of the outgoing lines corresponding to the several alternative conductors; Based on the total resistance of the outgoing lines corresponding to the several alternative conductors and the comprehensive parameter data of the target photovoltaic power source project, calculate the annual average cost of the outgoing lines corresponding to the several alternative conductors; Take the alternative conductor corresponding to the minimum annual average cost as the recommended conductor.

2. The method for selecting conductors of a photovoltaic power transmission line according to claim 1, characterized in that The comprehensive parameter data of the target photovoltaic power source project includes: installed capacity of photovoltaic panels, maximum load loss hours, on-grid electricity price, rated voltage of the outgoing line, number of outgoing line circuits, conductor split number of the outgoing line, number of towers per kilometer of the outgoing line, proportion of strain towers in the outgoing line, engineering investment recovery rate of the outgoing line, annual investment ratio, service life, temperature characteristic coefficient of photovoltaic panels, environmental condition data of the outgoing line, and line maintenance rate; among them, the environmental condition data of the outgoing line includes the basic wind speed, ice coating thickness, and geological conditions of the area where the outgoing line is located.

3. The wire selection method for the outgoing line of a photovoltaic power source according to claim 2, wherein Based on the comprehensive parameter data of the target photovoltaic power source project, calculate the single-phase current values that the photovoltaic power source needs to output at different ambient temperatures, and obtain a single-phase current value table. The calculation formula of the single-phase current value is as follows: ； Among them, I0 represents the single-phase flow rate; represents the installed capacity of the photovoltaic panels; represents the temperature characteristic coefficient of the photovoltaic panels, which varies according to the ambient temperature; V e represents the rated voltage of the outgoing line; Among them, the single-phase current table includes different ambient temperatures increasing in steps of S, and the single-phase current values that the photovoltaic power source needs to output at different ambient temperatures. The range of the ambient temperature is determined according to the area where the outgoing line is located.

4. The method for selecting conductors of a photovoltaic power transmission line according to claim 3, characterized in that Based on the single-phase current values that the photovoltaic power source needs to output at different ambient temperatures in the single-phase current value table, determining several alternative conductors that meet the ampacity requirements includes: Determine the initial ambient temperature according to the maximum value of the single-phase current in the single-phase current table, and select several conductors that meet the ampacity requirements at the initial ambient temperature as the initial alternative conductors; Based on the single-phase current values that the photovoltaic power source needs to output at different ambient temperatures in the single-phase current table, judge whether the initial alternative conductors meet the ampacity requirements at the first ambient temperature, and eliminate the initial alternative conductors that do not meet the requirements to obtain several alternative conductors; where the first ambient temperature is greater than the initial ambient temperature.

5. The method for selecting conductors of a photovoltaic power transmission line according to claim 4, wherein The determining the initial ambient temperature according to the maximum value of the single-phase current in the single-phase current table and selecting several conductors that meet the ampacity requirements at the initial ambient temperature includes: Select the ambient temperature corresponding to the maximum single-phase current value in the single-phase current table as the initial ambient temperature; Obtain the ampacity of the conductor at the initial ambient temperature; If the ampacity of the conductor at the initial ambient temperature is not less than the maximum single-phase current value in the single-phase current table, then the conductor meets the ampacity requirements at the initial ambient temperature; Select several conductors that meet the ampacity requirements at the initial ambient temperature as the initial alternative conductors.

6. The method for selecting conductors of a photovoltaic power transmission line according to claim 5, characterized in that, Based on the single-phase current values that the photovoltaic power source needs to send out at different ambient temperatures in the single-phase ammeter, determine whether the initial alternative wires meet the current-carrying capacity requirements at the first ambient temperature, and eliminate the initial alternative wires that do not meet the requirements to obtain several alternative wires, specifically including: S01: Based on the initial ambient temperature, use the step size S as an increment to obtain the first ambient temperature; S02: Obtain the current-carrying capacity of the initial alternative wires at the first ambient temperature; S03: Compare whether the current-carrying capacity of the initial alternative wires at the first ambient temperature is greater than or equal to the single-phase current value at the first ambient temperature in the single-phase current value table; S04: If it is greater than or equal to, determine that the initial alternative wire meets the current-carrying capacity requirements at the first ambient temperature, and replace the initial ambient temperature with the first ambient temperature and repeat steps S01 - S03 until the first ambient temperature reaches the maximum value of the ambient temperature in the single-phase current value table; If it is less than, determine that the initial alternative wire does not meet the current-carrying capacity requirements at the first ambient temperature and eliminate the initial alternative wire; S05: Based on the above steps S01 - S04, obtain several initial alternative wires that are not eliminated; S06: Use the several initial alternative wires that are not eliminated as several alternative wires.

7. The method for selecting conductors of a photovoltaic power transmission line according to claim 6, characterized in that, Based on the total resistance of the outgoing lines corresponding to several alternative wires and the comprehensive parameter data of the target photovoltaic power source project, calculate the annual average cost of the outgoing lines corresponding to several alternative wires, including: Based on the environmental condition data of the outgoing lines and the number of outgoing line loops, the number of conductor splits of the outgoing lines, the number of towers per kilometer of the outgoing lines, and the proportion of strain towers of the outgoing lines in the comprehensive parameter data, obtain the investment cost per kilometer of the body of the outgoing lines; According to the investment cost per kilometer of the body of the outgoing lines and the line maintenance rate, calculate the annual maintenance cost per kilometer of the outgoing lines; Based on the total resistance of the outgoing lines corresponding to several alternative wires, the rated current of the photovoltaic power source output, the maximum load loss hours, and the on-grid electricity price, calculate the annual loss cost per kilometer of the outgoing lines corresponding to several alternative wires; among them, the rated current of the photovoltaic power source output is calculated from the installed capacity of the photovoltaic panels and the rated voltage of the outgoing lines in the comprehensive parameter data; According to the investment cost per kilometer of the body of the outgoing lines, the annual maintenance cost per kilometer, the annual loss cost per kilometer of the outgoing lines corresponding to several alternative wires, and the comprehensive parameter data, calculate the annual average cost of the outgoing lines corresponding to several alternative wires.

8. The method for selecting conductors of a photovoltaic power transmission line according to claim 7, wherein The calculation formula for the annual average cost of the outgoing line corresponding to a certain alternative wire is expressed as follows: ； Among them, NF represents the annual average cost; Z represents the total project investment cost after conversion; r0 represents the investment recovery rate of the transmission line project; n represents the service life; represents the annual operating cost after conversion; Among them, ; ； where m represents the number of construction years; Z t represents the construction investment cost in the t-th year; Z s represents the investment cost per kilometer of the main body; K t represents the investment ratio in the t-th year; t represents the sequence number; Among them, ; ； Wherein, represents the annual operating cost per kilometer; represents the annual maintenance cost per kilometer; represents the annual loss cost per kilometer of the transmission line corresponding to a certain alternative conductor; t0 represents the year when part of the project is put into production.

9. A wire selection system for a photovoltaic power output line, characterized in that, Including: A data acquisition module for acquiring the comprehensive parameter data of the target photovoltaic power source project; A single-phase current module for calculating the single-phase current values that the photovoltaic power source needs to send out at different ambient temperatures based on the comprehensive parameter data of the target photovoltaic power source project to obtain a single-phase current value table; A wire screening module for determining several alternative wires that meet the current-carrying capacity requirements based on the single-phase current values that the photovoltaic power source needs to send out at different ambient temperatures in the single-phase current value table, and obtaining the total resistance of the outgoing lines corresponding to several alternative wires; The annual average cost calculation module is used to calculate the annual average cost of the outgoing lines corresponding to several alternative conductors based on the total resistance of the outgoing lines corresponding to the several alternative conductors and the comprehensive parameter data of the target photovoltaic power source project; The conductor determination module is used to use the alternative conductor corresponding to the minimum annual average cost as the recommended conductor.

10. A computer-readable storage medium, characterized in that, It stores a computer program, and when the computer program is executed, it implements the method for selecting conductors for the outgoing lines of photovoltaic power sources described in any one of claims 1-8.

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