Cable design analysis method and device, electronic equipment and readable storage medium

Abstract

The invention discloses a cable design analysis method and device, electronic equipment and a readable storage medium, and relates to the technical field of cable design analysis, and the method comprises the steps: extracting cable design information from completed photovoltaic engineering design information; performing cable design analysis on the cable design information through the photovoltaic engineering design information to obtain an analysis result; generating a self-adaptive cable adjustment scheme in combination with the photovoltaic engineering design information and the analysis result; and adjusting the cable design information based on the adaptive cable adjustment scheme. The method has the effect of further improving the efficiency of cable design analysis work.

Description

Technical Field

[0001] This application relates to the field of cable design and analysis technology, and in particular to a cable design and analysis method, apparatus, electronic device and readable storage medium. Background Technology

[0002] Currently, in photovoltaic (PV) engineering design, in addition to designing cable drawings, it is also necessary to calculate and analyze various cable-related parameters to improve the overall PV engineering design. However, in related technologies, manual calculation of parameters such as cable current carrying capacity and voltage drop is prone to errors and has low efficiency in complex operating conditions. Although related software can automate calculations and improve efficiency, it only provides mathematical calculation results, and subsequent manual analysis by engineers is still required, which does not significantly improve the overall efficiency of PV engineering design. Summary of the Invention

[0003] The purpose of this application is to at least solve one of the technical problems existing in the prior art, and to provide a cable design and analysis method, apparatus, electronic device and readable storage medium, with the aim of further improving the efficiency of cable design and analysis work.

[0004] In a first aspect, embodiments of this application provide a cable design and analysis method, including: Extract cable design information from the completed photovoltaic engineering design information; Using the photovoltaic engineering design information, cable design analysis is performed on the cable design information to obtain analysis results; Based on the photovoltaic engineering design information and the analysis results, an adaptive cable adjustment scheme is generated; Based on the adaptive cable adjustment scheme, the cable design information is adjusted.

[0005] According to the technical solution of the embodiments of this application, at least the following beneficial effects are achieved: after completing the preliminary photovoltaic engineering design, the cable design is analyzed first. By using the photovoltaic engineering design information that characterizes the overall scheme to analyze the feasibility of the cable design information, the reliability of the analysis results can be improved, thereby reducing the part that requires manual intervention. Furthermore, after the analysis is completed, an adaptive cable adjustment scheme can be automatically generated, further reducing the trouble of manual operation and further improving the efficiency of cable design analysis work.

[0006] According to some embodiments of this application, the cable design information includes cable number, cable model, laying method, length, and electrical parameters.

[0007] According to some embodiments of this application, the cable design analysis includes photovoltaic engineering design analysis, cable voltage drop calculation, and cable design requirement analysis.

[0008] According to some embodiments of this application, the cable design requirements analysis includes temperature rise analysis, voltage drop analysis, and mechanical strength analysis.

[0009] According to some embodiments of this application, the step of generating an adaptive cable adjustment scheme by combining the photovoltaic engineering design information and the analysis results includes: Based on the analysis results, multiple cable adjustment ranges are generated; The photovoltaic engineering design information is analyzed in conjunction with each of the multiple cable adjustment ranges to generate multiple adaptive cable adjustment schemes corresponding to the multiple cable adjustment ranges.

[0010] According to some embodiments of this application, the step of combining and analyzing the photovoltaic engineering design information with each of the multiple cable adjustment ranges to generate multiple adaptive cable adjustment schemes corresponding to the multiple cable adjustment ranges includes: The photovoltaic engineering design information is analyzed in conjunction with each of the cable adjustment ranges to generate multiple initial adjustment schemes corresponding to the multiple cable adjustment ranges; Select an adaptive cable adjustment scheme from the multiple initial adjustment schemes.

[0011] According to some embodiments of this application, it also includes: Based on the adjusted cable design information, the completed photovoltaic project design information is adjusted accordingly, including adjusting the photovoltaic project design drawings in the completed photovoltaic project design information.

[0012] Secondly, embodiments of this application provide an operation control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement the cable design and analysis method described in the first aspect.

[0013] Thirdly, embodiments of this application provide an electronic device including the operation control device described in the second aspect above.

[0014] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the cable design and analysis method as described in the first aspect above.

[0015] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0016] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0017] The present application will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a flowchart of a cable design and analysis method provided in one embodiment of this application; Figure 2 This is a schematic diagram of the cable voltage drop verification results provided in one embodiment of the present application for cable design analysis; Figure 3 This is a flowchart of a cable design and analysis method provided in another embodiment of this application; Figure 4 This is a flowchart of a cable design and analysis method provided in another embodiment of this application; Figure 5 This is a flowchart of a cable design and analysis method provided in another embodiment of this application; Figure 6 This is a schematic diagram of an operation control device for performing a cable design analysis method according to an embodiment of this application. Detailed Implementation

[0018] This section will describe in detail the specific embodiments of this application. Preferred embodiments of this application are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of this application, but they should not be construed as limiting the scope of protection of this application.

[0019] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0022] The various embodiments of the cable design and analysis method of this application will be further described below with reference to the accompanying drawings.

[0023] like Figure 1 As shown, Figure 1 This is a flowchart of a cable design analysis method provided in one embodiment of this application. The cable design analysis method may include, but is not limited to, steps S110, S120, S130 and S140.

[0024] Step S110: Extract cable design information from the completed photovoltaic engineering design information; Step S120: Using the photovoltaic engineering design information, perform cable design analysis on the cable design information to obtain the analysis results; Step S130: Based on the photovoltaic engineering design information and analysis results, generate an adaptive cable adjustment scheme; Step S140: Adjust the cable design information based on the adaptive cable adjustment scheme.

[0025] Understandably, after completing the preliminary photovoltaic (PV) engineering design, cable design analysis can be conducted first. The preliminary PV engineering design can include determining the overall layout of the PV power station, selecting components, configuring inverters, designing the support structure, and planning the preliminary electrical system. At this stage, the arrangement and tilt angle of the PV array can be rationally arranged based on factors such as the solar energy resources, terrain conditions, and available area of ​​the project site to maximize power generation efficiency. At the same time, appropriate component types and their power ratings can be selected, and corresponding inverter capacities and types (centralized, string, or micro inverters) can be matched. The support structure should also be selected considering wind resistance, snow load resistance, and corrosion resistance to ensure long-term stable operation. In addition, the electrical system planning can include the design of the DC side strings, the arrangement of combiner boxes, and the grid connection scheme on the AC side, and the preliminary determination of voltage levels, the location of power distribution equipment, and the configuration of protection devices. Furthermore, cable design can encompass various aspects such as the layout of the photovoltaic array, current and voltage characteristics, environmental conditions, and electrical safety regulations to ensure the reliability and economy of the photovoltaic project. In one embodiment, the cable design can calculate the maximum output current and voltage of the system based on the series and parallel configuration of the photovoltaic modules, thereby determining the current carrying capacity and withstand voltage rating of the cable. The DC cable between the photovoltaic array and the inverter typically needs to withstand high current and voltage fluctuations; therefore, UV-resistant, high-temperature resistant, and well-insulated DC-specific cables can be selected to reduce line losses and potential safety risks. Simultaneously, the selection of the cable cross-sectional area must consider both economic efficiency and voltage drop requirements. In addition, the cable laying method must be selected based on the site environment, choosing different options such as overhead, underground, or conduit laying, and considering mechanical protection and corrosion prevention measures. For AC side cables, they must meet the local power grid access requirements, including voltage level, insulation level, and short-circuit capacity. The cable path should be as short as possible to reduce losses, and parallel laying with high-voltage or signal lines should be avoided to prevent interference.

[0026] Therefore, cable design information is extracted from the completed photovoltaic engineering design information, and a professional feasibility analysis is conducted on the cable design information based on the photovoltaic engineering design information, that is, cable design analysis is performed on the cable design information to obtain the analysis results.

[0027] For example, in photovoltaic engineering design, the feasibility of cable design information is analyzed by utilizing photovoltaic engineering design information that characterizes the overall scheme. This mainly involves combining the electrical characteristics, environmental conditions, and operational requirements of the photovoltaic power station with the selection, laying, and protection measures of cables. The overall design information of the photovoltaic project can include the layout of the photovoltaic array, the electrical parameters of the components, the technical specifications of the inverter, and the total installed capacity and grid voltage level of the system. This data is used to analyze the electrical load data of the cables. For example, photovoltaic cables (DC-side cables) need to carry the maximum output current of the string or array, and the collector lines (AC-side cables) need to match the output power of the inverter and the voltage requirements of the grid. In the cable design work, the minimum cross-sectional area of ​​the cable can be calculated based on these parameters. At the same time, appropriate insulation materials and protection levels can be selected in combination with the cable laying environment. For example, high-temperature cross-linked polyethylene (XLPE) cables need to be selected in high-temperature areas, while moisture-proof and chemical corrosion-resistant armored cables need to be considered in humid or corrosive environments. Voltage drop analysis of cables is a crucial step in feasibility assessment. Based on the electrical topology of the photovoltaic system and the cable length, it is necessary to calculate the total voltage drop from the modules to the inverter and then to the grid connection point. For example, the DC side voltage drop is typically required to be controlled within 2% to avoid power loss affecting power generation efficiency, while the AC side voltage drop must meet grid connection standards and generally not exceed 3%. Short-circuit current analysis can verify whether the cable can withstand instantaneous large currents without damage under fault conditions based on the short-circuit capacity of the photovoltaic system and the operating characteristics of protection devices, while ensuring that the protection equipment can disconnect the fault circuit in time. Thermal stability analysis further evaluates whether the temperature rise of the cable under normal operation and short-circuit conditions is within the allowable range to avoid insulation aging or fire risks. In addition, the mechanical strength and laying method of the cable also need to be matched with the overall design of the photovoltaic project. For example, rooftop photovoltaic projects need to consider the flexibility and UV resistance of the cables.

[0028] In another embodiment, cable design analysis may include current carrying capacity analysis, voltage drop calculation, short-circuit current verification, and thermal stability assessment. Current carrying capacity analysis is used to ensure that the cable will not overheat under the maximum operating current, usually referring to the current carrying capacity standards specified by IEC or national standards. Voltage drop calculation is used to ensure that the total voltage drop from the photovoltaic array to the inverter and then to the grid connection point is within the allowable range to avoid power loss. Short-circuit current verification is used to verify whether the cable can withstand instantaneous large current without damage during system failure. Thermal stability assessment is used to evaluate whether the temperature rise of the cable during long-term operation affects the insulation performance.

[0029] Understandably, cable design is not an isolated process but is deeply coupled with factors such as photovoltaic array layout, electrical system architecture, environmental conditions, and economics. If cable design parameters are directly adjusted based solely on analysis results such as current, voltage drop, or short-circuit capacity, other system constraints may be ignored, leading to local optimization but global imbalance. For example, blindly increasing the cable cross-sectional area simply to reduce DC-side voltage drop may reduce line losses but could significantly increase material costs and construction difficulty, especially in long-distance laying or complex terrain conditions. In addition, cable selection must be compatible with the inverter's input voltage range, string design, and protection devices. If only voltage drop analysis is used as a basis, the inverter's tolerance to voltage fluctuations may be ignored, and even the efficiency of maximum power point tracking may be affected.

[0030] Therefore, in this embodiment, an adaptive cable adjustment scheme can be generated by combining photovoltaic engineering design information and analysis results. For example, the current carrying capacity, voltage drop, and short-circuit withstand capability in the cable design analysis results can be dynamically compared with the string configuration, inverter characteristics, and grid connection voltage in the overall electrical parameters of the photovoltaic system. Through iterative calculation, a range of cable specifications that meet all technical conditions can be found. For example, when determining the cross-sectional area of ​​a DC cable, the current carrying capacity requirement, voltage drop limit, and inverter input voltage window constraints must be met simultaneously. Simulation tools can also be used to simulate the performance under different operating conditions to ensure stable operation under extreme conditions. Environmental and construction factors are also included in the evaluation. For example, in ground-mounted power stations, the resistance to mechanical pressure and corrosion resistance of buried cables may be more important than the cross-sectional area.

[0031] In addition, cable adjustments also require economic analysis, because cable costs include not only material costs but also the comprehensive investment in transportation, laying, and subsequent maintenance. By introducing a cost-benefit model, the most economical option can be selected from the technically feasible solutions. For example, within the allowable voltage drop range, a smaller cross-sectional area cable can be selected to reduce costs, or a segmented optimization strategy can be adopted, using a larger cross-sectional area cable in the long-distance transmission section to reduce losses, while using standard specifications in the short-distance section.

[0032] Based on this, after generating an adaptive cable adjustment scheme, the cable design information is adjusted according to the adaptive cable adjustment scheme. It can be understood that the adaptive cable adjustment scheme can include multiple aspects such as electrical parameter optimization, laying method improvement, and material and structure adaptation. Among them, the adjustment of electrical parameters can include reselecting the cable cross-sectional area based on the current carrying capacity and voltage drop calculation results; the adjustment of laying method can include replanning the route to reduce cable length or avoid adverse environments such as high temperature and humidity, for example, changing the overhead laying to the buried laying to reduce the impact of ambient temperature on the cable current carrying capacity; the adjustment of materials and structure can include changing the cable type according to environmental conditions, etc.

[0033] In another embodiment of the cable design analysis method provided in this application, the cable design information includes cable number, cable model, laying method, length, and electrical parameters.

[0034] In this embodiment, the cable design information includes cable number, cable model, laying method, length, and electrical parameters. These information can be analyzed separately. The cable number, as a unique identifier, ensures accurate correspondence from drawings to construction and can verify the accuracy of the number. The selection of the cable model is related to conductor material, insulation class, and protection characteristics, allowing analysis of the matching between the photovoltaic array's output characteristics and environmental requirements. For example, a double-glass module system may require a cable model with a higher withstand voltage rating. Regarding the laying method, buried laying allows analysis of the correction of soil thermal resistivity for current carrying capacity, while overhead laying allows analysis of the impact of wind vibration on long-term reliability. The cable length is used for voltage drop analysis, and the cable length needs to be calculated using three-dimensional path modeling to account for the actual route of all bends and climbs, rather than a simple straight-line distance. Electrical parameters include rated current, short-circuit withstand capability, etc., and these data need to be analyzed for their coordination with the operating characteristics of the protection device.

[0035] In one embodiment, cable design information may also include the sealing rating of the cable termination, the grounding method of the metal shield, bending radius limits, flame retardant / fire resistant rating, and color coding specifications.

[0036] In another embodiment of this application, the cable design analysis method includes photovoltaic engineering design analysis, cable voltage drop calculation, and cable design requirement analysis.

[0037] In this embodiment, the photovoltaic engineering design analysis includes integrating spatial information such as the module arrangement, string division scheme, inverter location, and electrical room layout. The cable routing and connection logic are determined through topological relationship analysis. In specific implementation, a three-dimensional model can be built using CAD or BIM tools to automatically extract the spatial distance between each electrical node. At the same time, the current fluctuation range in different seasons is predicted by combining irradiation simulation data. For example, when using bifacial modules, the possibility of overcurrent due to back gain needs to be considered in the cable current carrying capacity calculation, while the tracking bracket system needs to reserve mechanical movement margin in the cable flexibility design. Cable voltage drop calculation includes calculating the resistance loss on the DC side from the string to the combiner box and then to the inverter in segments based on an accurate line impedance model. An iterative algorithm is used to optimize the selection of cross-sectional area so that the total voltage drop does not exceed the limit. For the AC side, the skin effect loss caused by harmonic current needs to be superimposed. Especially when using string inverters, high-frequency harmonics may cause additional voltage drop.

[0038] Cable design requirements analysis includes electrical safety analysis, which may include verifying the cable's insulation level to match the system's maximum voltage, including its ability to withstand switching overvoltages and lightning impulse voltages.

[0039] In one embodiment, the photovoltaic project uses 590Wp monocrystalline silicon bifacial modules. The voltage drop calculation is performed by connecting 26 photovoltaic modules in series to form a photovoltaic string. The combiner box is selected as the combiner equipment, and the connection between the photovoltaic string and the combiner box is a DC cable. Cable design analysis includes long-term allowable current carrying capacity analysis: Ipc >= Ical In the formula: Ipc----Cable current carrying capacity, in amperes (A); Ical ---- Calculated current for long-term operation of the circuit, in amperes (A); In this embodiment, the cable design information includes the selection of cable model PV1-F-1×4 from the photovoltaic string to the combiner box. The cable has a current carrying capacity of Ipc=44A, and the peak power current of the photovoltaic string is Impp=13.59A. We take Ical=Impp=13.59A.

[0040] Where Ipc>Ical indicates that the cable meets the long-term allowable current carrying capacity requirement.

[0041] Cable design analysis includes loop allowable voltage drop analysis: The formula for calculating cable voltage drop is as follows: Scac=P·2L·Ica / △Up,△Up= Uca·K In the formula: Ica----Cycle current calculation, unit is A; Scac ---- Calculated cross-sectional area of ​​cable, in units of ; P----Resistivity of copper conductor P=0.0184Ω· / m, aluminum conductor P=0.0315Ω· / m; L ---- Cable length, in meters; △Up ---- Permissible voltage drop in the circuit, in volts (V); Uca----Circuit calculation voltage, unit: V; K----DC side line loss, in percentage. Wherein, Ica = Impp = 13.59A; L is the maximum cable length L = 90m; Uca is the peak power voltage Uca = 43.41 × 26 = 1128.66V; K is the DC side line loss K = 1%.

[0042] Calculation and analysis show that Scac = 3.98 In other words, the selected photovoltaic string to string inverter cable meets the cable allowable voltage drop verification analysis.

[0043] refer to Figure 2 , Figure 2 This is a schematic diagram of the cable voltage drop verification result provided in an embodiment of this application for cable design analysis.

[0044] In another embodiment of the cable design analysis method provided in this application, the cable design requirements analysis includes temperature rise analysis, voltage drop analysis, and mechanical strength analysis.

[0045] Understandably, temperature rise analysis is a crucial step in ensuring that cables do not suffer from overheating during long-term operation, which could affect their lifespan or cause failures. Temperature rise analysis requires comprehensive consideration of multiple factors, including the cable's conductor material, insulation type, laying environment, and load characteristics. It calculates temperature changes under steady-state and transient conditions by establishing a thermal balance model. For example, by collecting the maximum output current of the photovoltaic array under different irradiation conditions and combining it with ambient temperature data of the cable laying area, the thermal resistance calculation formula provided in international standards such as IEC60287 is used to incorporate the effects of conductor loss, dielectric loss, and external heat sources into a unified evaluation system. For densely laid cable groups, the thermal interference effects between them must also be considered, and temperature rise performance can be optimized by adjusting cable spacing or adopting ventilation and heat dissipation designs. Voltage drop analysis is used for efficiency optimization in the power transmission process. It can predict the voltage distribution of each node in the system by accurately modeling the impedance characteristics of the cable. For example, based on parameters such as the string output voltage range and MPPT working window, a complete voltage drop model from the component to the inverter can be established. Then, the impedance per unit length can be calculated based on the AC resistance and inductive reactance parameters of the cable. Finally, the precise length of each cable segment can be obtained by combining a three-dimensional path planning tool, and the system voltage distribution can be solved by the nodal voltage method. Mechanical strength analysis is a systematic assessment of the physical stresses that cables may experience during installation and operation. Different analyses are required depending on the laying method. For example, for overhead cables, the impact of dynamic loads such as wind vibration and ice load on the tensile strength of the cable and the fatigue life of the suspension components needs to be evaluated. For directly buried cables, factors such as soil pressure, groundwater erosion, and possible external excavation impact need to be analyzed. Mechanical strength analysis can use finite element analysis software to establish a mechanical model of the cable, simulate the stress distribution under different working conditions, and combine it with on-site soil sampling data or wind pressure records to calibrate the model parameters.

[0046] like Figure 3 As shown, Figure 3 This is a flowchart of a cable design and analysis method provided in another embodiment of this application; the above step S130 may include, but is not limited to, steps S230 and S330.

[0047] Step S230: Based on the analysis results, generate multiple cable adjustment ranges; Step S330: Combine the photovoltaic engineering design information with the adjustment range of each cable for analysis, and generate multiple adaptive cable adjustment schemes corresponding to multiple cable adjustment ranges.

[0048] It is understandable that the completed preliminary photovoltaic engineering design information can be a complete scheme including cable design. In other words, if the complete scheme of cable design in the completed preliminary photovoltaic engineering design information is found to be without abnormalities or errors, the complete scheme of cable design in the completed preliminary photovoltaic engineering design information can be used as the final design scheme.

[0049] Understandably, due to the inherent complexity of photovoltaic systems and the diversity of engineering constraints, when faced with a trade-off between multiple objectives such as electrical performance, economic cost, and construction feasibility, a single adjustment scheme may be difficult to meet all requirements simultaneously. Therefore, multiple cable adjustment ranges can be generated based on the analysis results.

[0050] For example, for high-current paths in DC-side main feeders, a tuning range primarily aimed at reducing losses is typically generated, and it might be recommended to increase the cross-sectional area from the initial design of 120. Expanded to 150-185 While material costs increase within this range, system efficiency can be improved; for branch cables, an economical adjustment range may be provided, using 90-120 while maintaining the current carrying capacity safety margin. The cross-sectional area combination is used to balance the return on investment. On the AC output side of the inverter, when the system expansion causes the short-circuit capacity to approach the limit of the switching equipment, it may be recommended to use a parallel cable scheme to reduce the inductance parameter. Although this adjustment increases the wiring complexity, it can effectively suppress the short-circuit current.

[0051] Subsequently, the overall photovoltaic engineering design information is coupled with multiple cable adjustment ranges for analysis, generating multiple adaptive adjustment schemes. Here, the first step is to establish a digital model of the photovoltaic system, transforming core elements such as array layout, electrical parameters, and environmental data into a quantifiable constraint library. Different adjustment ranges are mapped to specific sections. For critical paths like the DC main circuit, the generated adaptive cable adjustment scheme can employ a cross-sectional area gradient adjustment strategy, using 185° cross-sectional area gradients in the hot section near the inverter. High-temperature resistant cables ensure sufficient heat dissipation, while the far end of the array is downgraded to 150. Conventional cable cost balancing; for mountain power stations with complex terrain, the generated adaptive cable adjustment scheme can re-plan the cable route topology, using prefabricated branch cables to reduce on-site joints in steep slope sections, while maintaining traditional direct burial in flat areas.

[0052] In one embodiment, the completed preliminary photovoltaic engineering design information may be a complete scheme that does not include cable design. In this case, when performing cable design analysis on the cable design information, the incompleteness of the cable design can be found. Then, based on the analysis results, an adaptive cable adjustment scheme that includes targeted supplementation of the incomplete parts of the cable design can be generated.

[0053] In one embodiment, since the photovoltaic area plots are relatively scattered and the terrain is uneven, a scheme without string inverters is adopted, which is a DC combiner box combiner and combiner box to transformer inverter integrated equipment. Therefore, there is no AC cable from the inverter to the transformer, only a DC cable from the DC combiner box to the inverter side switch cabinet of the transformer inverter integrated equipment.

[0054] The cable design information includes the selection of flame-retardant Class C aluminum alloy conductor, cross-linked polyethylene insulated, steel tape armored, PVC sheathed cable for the DC combiner switch cabinet on the inverter side of the combiner box to the integrated inverter equipment, namely ZC-YJLHV22-1.8 / 3kV, but does not include the specific cable cross-sectional area parameters.

[0055] Based on this, the generated adaptive cable adjustment scheme may include additional specific optional cable cross-sectional area parameters.

[0056] For example, based on the photovoltaic engineering design information and analysis results, it can be seen that a DC combiner box is selected for the inverter. The combiner box has a combiner voltage of 1128.66V and a maximum output current of 217.44A. Therefore, the cable from the combiner box to the DC combiner switch cabinet of the integrated inverter equipment can be of model ZC-YJLHV22-1.8 / 3kV-2×120. ZC-YJLHV22-1.8 / 3kV-2×150 Power cables; Then, using the photovoltaic engineering design information, cable design analysis is performed on the cable design information, including... Cable design analysis includes long-term allowable current carrying capacity analysis: Ipc >= Ical In the formula: Ipc----Cable current carrying capacity, in amperes (A); Ical ---- Calculated current for long-term operation of the circuit, in amperes (A); When the cable from the DC combiner box to the inverter side of the integrated inverter unit is selected, ZC-YJLHV22-1.8 / 3kV-2×150... The cable has a current carrying capacity of Ipc = 365A, and the peak power current of the photovoltaic string is Impp = 13.59A. Therefore, we take Ical = Impp × 16 = 217.44A.

[0057] Ipc>Ica, ZC-YJLHV22-1.8 / 3kV-2×150 The cable meets the long-term allowable current carrying capacity requirements.

[0058] Cable design analysis includes loop allowable voltage drop analysis: The formula for calculating cable voltage drop is as follows: Scac=P·2L·Ica / △Up,△Up= Uca·K In the formula: Ica----Cycle current calculation, unit is A; Scac ---- Calculated cross-sectional area of ​​cable, in units of ; P----Resistivity of copper conductor P=0.0184Ω· / m, aluminum conductor P=0.0315Ω· / m; L ---- Cable length, in meters; △Up ---- Permissible voltage drop in the circuit, in volts (V); Uca----Circuit calculation voltage, unit: V; K----DC side line loss, in percentage. Where Ica = Impp × 16 = 217.44A, L is the maximum cable length L = 245m, Uca is the peak power voltage, Uca = 43.41 × 26 = 1128.66V, and K is the DC side line loss K = 2%; Calculation and analysis show that Scac = 147.65 That is, the DC cable on the inverter side of the DC combiner box to the integrated inverter unit is selected as ZC-YJLHV22-1.8 / 3kV-2×150. The cable's allowable voltage drop verification analysis is satisfied.

[0059] When the cable from the DC combiner box to the inverter side of the integrated inverter unit is selected, ZC-YJLHV22-1.8 / 3kV-2×120... The cable has a current carrying capacity of Impp = 13.59A, so Ical = Impp × 16 = 217.44A.

[0060] Ipc>Ical, ZC-YJLHV22-1.8 / 3kV-2×120 The cable meets the long-term allowable current carrying capacity requirements.

[0061] Cable design analysis includes loop allowable voltage drop analysis: The formula for calculating cable voltage drop is as follows: Scac=P·2L·Ica / △Up,△Up= Uca·K In the formula: Ica----Cycle current calculation, unit is A; Scac ---- Calculated cross-sectional area of ​​cable, in units of ; P----Resistivity of copper conductor P=0.0184Ω· / m, aluminum conductor P=0.0315Ω· / m; L ---- Cable length, in meters; △Up ---- Permissible voltage drop in the circuit, in volts (V); Uca----Circuit calculation voltage, unit: V; K----DC side line loss, in percentage. Where: Ica = Impp × 16 = 217.44A, L is the maximum cable length L = 195m, Uca is the peak power voltage, Uca = 43.41 × 26 = 1128.66V, and K is the DC side line loss K = 2%.

[0062] Calculations and analysis show that Scac = 118.34 That is, the DC cable on the inverter side of the DC combiner box to the integrated inverter unit is selected as ZC-YJLHV22-1.8 / 3kV-2×120. The cable's allowable voltage drop verification analysis is satisfied.

[0063] Based on this, the generated adaptive cable adjustment scheme can include using the ZC-YJLHV22-1.8 / 3kV-2×120 model cable for the DC combiner switch cabinet from the combiner box to the integrated inverter equipment. ZC-YJLHV22-1.8 / 3kV-2×150 For power cables, when the length of the DC cable from the DC combiner box to the inverter side of the integrated inverter unit is greater than 195m, ZC-YJLHV22-1.8 / 3kV-2×150 should be selected. For m lengths less than or equal to 200m, use ZC-YJLHV22-1.8 / 3kV-2×120. .

[0064] like Figure 4 As shown, Figure 4 This is a flowchart of a cable design and analysis method provided in another embodiment of this application; regarding the above step S330, it may include, but is not limited to, steps S430 and S530.

[0065] Step S430: Combine the photovoltaic engineering design information with the adjustment range of each cable and analyze them to generate multiple initial adjustment schemes corresponding to multiple cable adjustment ranges; Step S530: Select an adaptive cable adjustment scheme from multiple initial adjustment schemes.

[0066] Understandably, combining photovoltaic engineering design information with the adjustment range of each cable to generate multiple adjustment schemes corresponding to multiple cable adjustment ranges can be considered as initial adjustment schemes. This is because although these schemes have considered key factors such as electrical performance, environmental adaptability, and economy, they have not yet considered practical constraints such as construction feedback, equipment supply fluctuations, and operational data verification. For example, the theoretically optimal gradient cross-sectional area design scheme may need to be adjusted due to the cable manufacturer's limited spot inventory. This is because the prefabricated branch cable scheme planned for mountain projects may find after on-site surveys that the geological conditions of certain sections are not suitable for the installation of embedded parts.

[0067] Therefore, an adaptive cable adjustment scheme can be selected from multiple initial adjustment schemes based on key constraints. That is, the most decisive constraints are identified as the screening criteria. For example, for photovoltaic power plants located on coastal mudflats, a comprehensive scheme focusing on resistance to salt spray corrosion is preferred.

[0068] like Figure 5 As shown, Figure 5 This is a flowchart of a cable design and analysis method provided in another embodiment of this application; the cable design and analysis method described above may also include, but is not limited to, step S150.

[0069] Step S150: Based on the adjusted cable design information, adjust the completed photovoltaic engineering design information accordingly, including adjusting the photovoltaic engineering design drawings in the completed photovoltaic engineering design information.

[0070] In this embodiment, cable design information can establish a two-way association mechanism with the photovoltaic engineering design drawings interface of the completed photovoltaic engineering design information. The photovoltaic engineering design drawings in the completed photovoltaic engineering design information can be built on a model platform such as CAD. The completed photovoltaic engineering design information can be visualized on the platform. When the engineer modifies the cable model in the cable attribute panel of the platform, the corresponding legend symbols and annotation information in the drawings can be automatically updated. At the same time, the current carrying capacity and voltage drop parameters on the cable path are re-verified, and the updated heat distribution cloud map is rendered in real time in the three-dimensional view. When a specific cable is selected in the drawing, its complete laying path will be highlighted, and the cable's real-time technical parameters, a list of connected equipment, and upstream and downstream related lines will be displayed simultaneously in the information window.

[0071] Based on the cable design and analysis methods of the above embodiments, the following presents various embodiments of the operation control device, electronic device, computer-readable storage medium, and computer program product of this application.

[0072] like Figure 6 As shown, Figure 6 This is a schematic diagram of an operation control device for performing a cable design analysis method according to an embodiment of this application. The operation control device 600 implemented in this application includes: a processor 620, a memory 610, and a computer program stored in the memory 610 and executable on the processor 620, wherein... Figure 6 The example uses a processor 620 and a memory 610.

[0073] The processor 620 and the memory 610 can be connected via a bus or other means. Figure 6 Taking the example of a connection between China and Israel via a bus.

[0074] Memory 610, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory 610 may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory 610 may optionally include remotely located memories 610 relative to processor 620, which can be connected to the operation control device 600 via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0075] Those skilled in the art will understand that Figure 6 The device structure shown does not constitute a limitation on the operation control device 600, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0076] exist Figure 6 In the illustrated operation control device 600, the processor 620 can be used to call the control program stored in the memory 610, thereby implementing the cable design and analysis method described above. Specifically, the non-transient software program and instructions required to implement the cable design and analysis method of the above embodiment are stored in the memory 610, and when executed by the processor 620, the cable design and analysis method of the above embodiment is executed.

[0077] It is worth noting that, since the operation control device 600 of this application embodiment can execute the cable design analysis method of any of the above embodiments, the specific implementation method and technical effect of the operation control device 600 of this application embodiment can refer to the specific implementation method and technical effect of the cable design analysis method of any of the above embodiments.

[0078] Furthermore, one embodiment of this application also provides an electronic device that includes the operation control device described in the above embodiment.

[0079] It is worth noting that, since the electronic device of this application embodiment includes the operation control device of the above embodiments, and the operation control device of the above embodiments can execute the cable design analysis method of any of the above embodiments, the specific implementation method and technical effect of the electronic device of this application embodiment can refer to the specific implementation method and technical effect of the cable design analysis method of any of the above embodiments.

[0080] Furthermore, one embodiment of this application provides a computer-readable storage medium storing computer-executable instructions for performing the cable design analysis method described above. Exemplarily, the above-described method is executed... Figure 1 , Figures 3 to 5 The methods and steps in the text.

[0081] It is worth noting that, since the computer-readable storage medium of this application embodiment can execute the cable design and analysis method of any of the above embodiments, the specific implementation and technical effects of the computer-readable storage medium of this application embodiment can be referred to the specific implementation and technical effects of the cable design and analysis method of any of the above embodiments.

[0082] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which may include computer storage media or non-transitory media and communication media or transient media. As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc DVD or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0083] In the several embodiments provided in this application, it should be understood that the disclosed systems, instruments, and methods can be implemented in other ways. For example, the instrument embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between instruments or units may be electrical, mechanical, or other forms. Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0084] It should also be understood that the various implementation methods provided in this application can be combined arbitrarily to achieve different technical effects.

[0085] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A cable design and analysis method, characterized in that, include: Extract cable design information from the completed photovoltaic engineering design information; Using the photovoltaic engineering design information, cable design analysis is performed on the cable design information to obtain analysis results; Based on the photovoltaic engineering design information and the analysis results, an adaptive cable adjustment scheme is generated; Based on the adaptive cable adjustment scheme, the cable design information is adjusted.

2. The cable design and analysis method according to claim 1, characterized in that, The cable design information includes cable number, cable model, laying method, length, and electrical parameters.

3. The cable design and analysis method according to claim 1, characterized in that, The cable design analysis includes photovoltaic engineering design analysis, cable voltage drop calculation, and cable design requirement analysis.

4. The cable design and analysis method according to claim 3, characterized in that, The cable design requirements analysis includes temperature rise analysis, voltage drop analysis, and mechanical strength analysis.

5. The cable design and analysis method according to claim 1, characterized in that, The process of generating an adaptive cable adjustment scheme by combining the photovoltaic engineering design information and the analysis results includes: Based on the analysis results, multiple cable adjustment ranges are generated; The photovoltaic engineering design information is analyzed in conjunction with each of the multiple cable adjustment ranges to generate multiple adaptive cable adjustment schemes corresponding to the multiple cable adjustment ranges.

6. The cable design and analysis method according to claim 5, characterized in that, The step of combining and analyzing the photovoltaic engineering design information with each of the multiple cable adjustment ranges to generate multiple adaptive cable adjustment schemes corresponding to the multiple cable adjustment ranges includes: The photovoltaic engineering design information is analyzed in conjunction with each of the cable adjustment ranges to generate multiple initial adjustment schemes corresponding to the multiple cable adjustment ranges; Select an adaptive cable adjustment scheme from the multiple initial adjustment schemes.

7. The cable design and analysis method according to claim 1, characterized in that, Also includes: Based on the adjusted cable design information, the completed photovoltaic project design information is adjusted accordingly, including adjusting the photovoltaic project design drawings in the completed photovoltaic project design information.

8. An operation control device, characterized in that, The method includes a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the cable design analysis method as described in any one of claims 1 to 7.

9. An electronic device, characterized in that, Includes the operation control device as described in claim 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions for causing a computer to perform the cable design and analysis method as described in any one of claims 1 to 7.

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