Computer-based Low-voltage Cable Layout Planning Method for Photovoltaic Power Plants

Abstract

The present invention discloses a computer-based low-voltage cable layout planning method for a photovoltaic field; the method includes the following steps: First, taking each secondary busbar device as the center point, dividing the busbar area into multiple phalanxes, and generating a cross coordinate system for each center point; then, taking any axial direction with the same name in all the cross coordinate systems as the collection axis for collection, connecting each first-level busbar device closest to the corresponding collection axis in each quadrant to the corresponding secondary busbar device; then, finding another first-level busbar device closest to the first-level busbar device that has been connected in each quadrant, and performing busbar collection according to whether the projection length X of the two on the corresponding collection axis is greater than the projection length Y on the other axis; finally, repeating the execution until the collection of all the first-level busbar devices is completed. The application of the present invention can achieve finding a cable channel plan with a better path efficiently and accurately while ensuring that the requirements of design and actual construction are met.

Description

Technical Field

[0001] The present invention relates to the technical field of computer-aided design, and particularly to a method for planning the layout of low-voltage cables in a photovoltaic field based on a computer. Background Art

[0002] In the design of existing photovoltaic field projects, designers need to manually route the low-voltage busbar cables from string inverters or DC combiner boxes in the photovoltaic field to box-type transformers or central / distributed inverters. Here, string inverters and DC combiner boxes are collectively referred to as primary busbar equipment; box-type transformers and central / distributed inverters are collectively referred to as secondary busbar equipment.

[0003] In practical applications, the existing technologies mainly have the following problems:

[0004] 1. For a general 100 MW photovoltaic project, there are usually 500 - 600 low-voltage busbar cables that need to be planned and designed, which takes a lot of time.

[0005] 2. The cable routing paths are mostly restricted by the experience and level of designers.

[0006] Therefore, how to efficiently and accurately find a cable channel plan with a better path while ensuring that the design and actual construction requirements are met has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0007] In view of the above-mentioned defects of the existing technologies, the present invention provides a method for planning the layout of low-voltage cables in a photovoltaic field based on a computer, and the purpose is to more efficiently and accurately find a cable channel plan with a better path while ensuring that the design and actual construction requirements are met.

[0008] To achieve the above purpose, the present invention discloses a method for planning the layout of low-voltage cables in a photovoltaic field based on a computer. The photovoltaic field includes a busbar area formed by multiple arrays of photovoltaic power generation units, and primary busbar equipment and secondary busbar equipment arranged in the busbar area.

[0009] The planning process includes the following steps:

[0010] Step 1: Obtain the positions and electrical information of all the photovoltaic power generation units, all the primary busbar equipment, and all the secondary busbar equipment.

[0011] Step 2: Set the laying constraint conditions for the cables.

[0012] Step 3: Take each of the secondary busbar equipment as the center point, divide the busbar area into multiple squares formed by several of the photovoltaic power generation units, and generate a cross coordinate system corresponding to the plane drawing for each center point.

[0013] Step 4: Divide the multiple photovoltaic power generation units belonging to each of the cross coordinate systems into four quadrants according to the corresponding cross coordinate systems;

[0014] Step 5: Use any axial direction with the same name in all the cross coordinate systems as the collection axis for collection. Lay the first-level busbar equipment closest to the corresponding collection axis in each quadrant to the corresponding center point according to the corresponding constraint conditions and connect it to the corresponding second-level busbar equipment;

[0015] Step 6: Find another first-level busbar equipment closest to the first-level busbar equipment that has completed connection in each quadrant, and judge whether the projection length X of the two on the corresponding collection axis is greater than the projection length Y on the other axis;

[0016] If X≥Y, the other first-level busbar equipment is collected with the collection axis and is preferentially collected to the collection axis;

[0017] If X<Y, the other first-level busbar equipment adopts a cable laying method that includes an overlapping route with the cable of the first-level busbar equipment that has completed connection, and then is connected to the second-level busbar equipment through the same path as the cable laying of the first-level busbar equipment that has completed connection;

[0018] Step 7: Repeat Step 6 until the collection of all the first-level busbar equipment is completed;

[0019] Step 8: After completing all, obtain the low-voltage busbar cable planning path of the photovoltaic power station.

[0020] Preferably, each step is executed in the form of a computer program on the AutoCAD or REVIT software platform.

[0021] Advantages of the present invention:

[0022] The application of the present invention can achieve an efficient and accurate search for a cable channel planning with a better path while ensuring that the design and actual construction requirements are met.

[0023] The following will further illustrate the concept, specific structure and technical effects generated by the present invention with reference to the accompanying drawings to fully understand the purpose, features and effects of the present invention. Description of the Drawings

[0024] Figure 1 Show a flowchart of an embodiment of the present invention.

[0025] Figure 2 Show a schematic plan view of a busbar area in an embodiment of the present invention.

[0026] Figure 3Schematic diagram showing the state of completing Step 2 in an embodiment of the present invention.

[0027] Figure 4 Schematic diagram showing the state of completing Step 3 in an embodiment of the present invention.

[0028] Figure 5 Schematic diagram showing the state of completing Step 4 in an embodiment of the present invention.

[0029] Figure 6 Schematic diagram showing the state of completing Step 5 in an embodiment of the present invention.

[0030] Figure 7 Schematic diagram showing the state of completing Step 6 in an embodiment of the present invention.

[0031] Figure 8 Chart showing the comparison of the usage effects between an embodiment of the present invention and the prior art. Detailed implementation manners

[0032] Embodiment

[0033] As Figures 1 to 8 shown, for the computer-based low-voltage cable layout planning method for a photovoltaic field, the photovoltaic field includes a busbar area formed by multiple arrays of photovoltaic power generation units, and a primary busbar device and a secondary busbar device arranged in the busbar area.

[0034] The planning process includes the following steps:

[0035] Step 1, obtain the positions and electrical information of all photovoltaic power generation units, all primary busbar devices, and all secondary busbar devices;

[0036] Step 2, set the laying constraint conditions for cable laying;

[0037] Step 3, take each secondary busbar device as the center point, divide the busbar area into multiple squares formed by several photovoltaic power generation units, and generate a cross coordinate system corresponding to the floor plan for each center point;

[0038] Step 4, divide the multiple photovoltaic power generation units belonging to each cross coordinate system into four quadrants according to the corresponding cross coordinate system;

[0039] Step 5, perform collection with any axial direction with the same name in all cross coordinate systems as the collection axis, and lay the primary busbar device closest to the corresponding collection axis in each quadrant to the corresponding center point and connect it to the corresponding secondary busbar device according to the corresponding constraint conditions;

[0040] Step 6: In each quadrant, find another primary busbar device that is closest to the primary busbar device whose connection has been completed, and determine whether the projected length X of the two on the corresponding converging axis is greater than the projected length Y on the other axis;

[0041] If X ≥ Y, the other primary busbar device converges along the converging axis and is preferentially converged to the converging axis;

[0042] If X < Y, the other primary busbar device adopts a cable laying method that includes an overlapping route with the cable of the primary busbar device whose connection has been completed, and then is connected to the secondary busbar device through the same path as the cable laying of the primary busbar device whose connection has been completed;

[0043] Step 7: Repeat Step 6 until the convergence of all primary busbar devices is completed;

[0044] Step 8: After all are completed, the planned path of the low-voltage busbar cable of the photovoltaic field is obtained.

[0045] The present invention aims to solve the problem of how to balance less investment and engineering operability while meeting the requirements of relevant designs and standards under the condition that the positions of the string, primary and secondary busbar devices have been determined.

[0046] The path planning of the low-voltage busbar cable can be transformed into a minimum spanning tree concept. The goal is to connect all primary busbar devices at the given positions to the secondary busbar devices through cables. Since the positions of each device have been determined, the Euclidean distance between a single primary busbar device and the secondary busbar device will be determined. In actual engineering, the cable laying mostly selects the horizontal and vertical method in combination with the construction difficulty and operability. Therefore, the actual horizontal length of the low-voltage busbar cable is also determined.

[0047] Through the above ideas, the problem of the present invention is transformed into how to connect all primary busbar devices to the corresponding common secondary busbar devices through a shortest common network path.

[0048] Considering the requirement that the cables should be in the same trench as much as possible, the research will also be extended to the scope of how to use recursion. At the same time, some constraints need to be noted, such as cables cannot be laid under the components; the influence of terrain factors needs to be considered; the cable cross-section within the allowable range of the parameter calculation of the primary and secondary busbar devices needs to be considered.

[0049] Finally, in order to ensure the efficiency of the algorithm and the restoration degree of the actual terrain, corresponding research on the cable sampling accuracy is also carried out.

[0050] In some embodiments, each step is executed in the form of a computer program on the AutoCAD or REVIT software platform.

[0051] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art in this technical field based on the concept of the present invention through logical analysis, reasoning, or limited experiments on the basis of the prior art should fall within the protection scope determined by the claims.

Claims

1. Computer-based low-voltage cable layout planning method for photovoltaic fields; characterized in that, The photovoltaic field includes a converging area formed by a plurality of arrays of photovoltaic power generation units, as well as a primary converging device and a secondary converging device arranged in the converging area; the planning process includes the following steps: Step 1, obtain the position and electrical information of all the photovoltaic power generation units, all the primary converging devices, and all the secondary converging devices; Step 2, set the laying constraints for cable laying; Step 3, take each of the secondary converging devices as the center point, divide the converging area into a plurality of phalanxes formed by several of the photovoltaic power generation units, and generate a cross coordinate system corresponding to the plan view for each of the center points; Step 4, divide the multiple photovoltaic power generation units belonging to each of the cross coordinate systems into four quadrants according to the corresponding cross coordinate system; Step 5, perform convergence with any axial direction of the same name in all the cross coordinate systems as the converging axis, and lay each of the primary converging devices closest to the corresponding converging axis in each quadrant to be connected to the corresponding center point and the corresponding secondary converging device according to the corresponding constraints; Step 6, find another primary converging device closest to the already connected primary converging device in each quadrant, and judge whether the projection length X of the two on the corresponding converging axis is greater than the projection length Y on the other axis; If X≥Y, then another primary converging device is converged with the converging axis and preferentially converged to the converging axis; If X<Y, then another primary converging device adopts a cable laying method including an overlapping route with the already connected primary converging device, and then is connected to the secondary converging device through the same path as the cable laying of the already connected primary converging device; Step 7, repeat Step 6 until the convergence of all the primary converging devices is completed; Step 8, after completing all, obtain the low-voltage converging cable planning path of the photovoltaic field.

2. The computer-based low-voltage cable layout planning method for a photovoltaic field according to claim 1, wherein, Execute each step in the form of a computer program on the AutoCAD or REVIT software platform.

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