A distribution network planning method and device

Abstract

This article provides a distribution network planning method and device, wherein the method includes: determining multiple groups of parameter information in the area to be planned, each group of parameter information at least includes: AC / DC load information and new energy access information; calculating the cost of each backbone grid structure of the distribution network corresponding to each group of parameter information; performing an economic analysis on the cost of each backbone grid structure of the distribution network corresponding to each group of parameter information, and determining the parameter range of each backbone grid structure of the distribution network; determining the backbone grid structure of the distribution network in the area to be planned according to the parameter range of each backbone grid structure of the distribution network and the planning information of the area to be planned. The parameter range of each backbone grid structure of the distribution network determined in this article can provide a favorable reference for planners, so that planners can configure the backbone grid structure of the distribution network in the area to be planned according to these parameter ranges.

Description

Technical Field

[0001] This article relates to the technical field of power system planning and design, and in particular to a distribution network planning method and device. Background Art

[0002] With the access of a large number of distributed power sources and intelligent AC / DC multi-loads, flexible AC / DC distribution networks have become one of the important development forms of future distribution networks. However, there are large differences in the distribution and rated voltage of these DC sources, storage and load devices, and there are many options for the backbone grid structure and interconnection methods of flexible AC / DC distribution networks. Therefore, for a certain region, it is very important to reasonably select the most economical form of AC / DC distribution network according to the type, distribution and other application scenarios of AC / DC sources, storage and loads in the region.

[0003] In the prior art, the form of the AC / DC distribution network (including the backbone grid structure and interconnection method of the distribution network) is determined based on the types and distribution of AC / DC sources, storage and loads in the region at the current time point. This method has the following defects: the application scenarios in the region will continue to change with the development of the economy and the upgrading of the industry. Selecting the form of the AC / DC distribution network based solely on the application scenarios at the current time point may not be economical in the long run and cannot meet future needs. Summary of the invention

[0004] This paper aims to solve the problem that in the existing technology, when determining the form of distribution network, only the types and distribution of existing AC and DC sources, storage and loads in the planned area are considered, but the planning information is not considered. Therefore, it cannot meet future needs and wastes financial resources in the long run.

[0005] In order to solve the above technical problems, a first aspect of this document provides a distribution network planning method, including:

[0006] Determine multiple groups of parameter information in the area to be planned, each group of parameter information at least includes: AC and DC load information and new energy access information;

[0007] Calculate the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information;

[0008] Performing an economic analysis on the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information, and determining the parameter range of each backbone grid structure of the distribution network;

[0009] The backbone grid structure of the distribution network in the area to be planned is determined according to the parameter range of each backbone grid structure of the distribution network and the planning information of the area to be planned.

[0010] In a further embodiment, determining multiple sets of parameter information in the area to be planned includes:

[0011] The AC / DC load information and the new energy access information are changed according to a preset first rule, and each piece of AC / DC load information and new energy access information is used as a group of parameter information.

[0012] In a further embodiment, an economic analysis is performed on the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information to determine the parameter range of each backbone grid structure of the distribution network, including:

[0013] Comparing the costs of the distribution network backbone grid structures corresponding to the various sets of parameter information, and taking the distribution network backbone grid structure with the minimum cost as the distribution network economic backbone grid structure corresponding to the various sets of parameter information;

[0014] According to the economic backbone grid structure of the distribution network corresponding to each group of parameter information, the parameter information is merged to obtain the parameter range corresponding to each backbone grid structure of the distribution network.

[0015] In a further embodiment, the distribution network planning method further includes:

[0016] Determining multiple voltage level information in the area to be planned;

[0017] Calculate the cost of each interconnection mode of the distribution network corresponding to each voltage level information;

[0018] Conduct economic analysis on the cost of each interconnection mode of the distribution network corresponding to each voltage level information, and determine the voltage level range of each interconnection mode of the distribution network;

[0019] The distribution network interconnection mode of the area to be planned is determined according to the voltage level range of each interconnection mode of the distribution network and the planning information of the area to be planned.

[0020] In a further embodiment, the determining of the plurality of voltage level information in the area to be planned includes:

[0021] The voltage level information is changed according to a preset second rule to obtain multiple voltage level information.

[0022] In a further embodiment, the economic comparison of the costs of each interconnection mode of the distribution network corresponding to each voltage level information to determine the voltage level range of each interconnection mode of the distribution network includes:

[0023] Compare the costs of various interconnection modes of distribution networks corresponding to various voltage level information, and take the interconnection mode of distribution networks with the lowest cost as the economic interconnection mode of distribution networks corresponding to various voltage level information;

[0024] The voltage level information is combined according to the economic interconnection modes of the distribution network corresponding to the voltage level information to obtain the voltage level ranges corresponding to the economic interconnection modes of the distribution network.

[0025] A second aspect of the present invention provides a distribution network planning device, comprising:

[0026] A parameter division module is used to determine multiple groups of parameter information in the area to be planned, each group of parameter information at least includes: AC and DC load information and new energy access information;

[0027] A first calculation module is used to calculate the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information;

[0028] The first analysis module is used to perform an economic analysis on the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information, and determine the parameter range of each backbone grid structure of the distribution network;

[0029] The grid structure planning module is used to determine the backbone grid structure of the distribution network in the area to be planned according to the parameter range of each backbone grid structure of the distribution network and the planning information of the area to be planned.

[0030] In a further embodiment, the distribution network planning device further includes:

[0031] A voltage level classification module, used to determine information of multiple voltage levels in the area to be planned;

[0032] The second calculation module is used to calculate the cost of each interconnection mode of the distribution network corresponding to each voltage level information;

[0033] The second analysis module is used to perform an economic analysis on the cost of each interconnection mode of the distribution network corresponding to each voltage level information, and determine the voltage level range of each interconnection mode of the distribution network;

[0034] The interconnection mode planning module is used to determine the distribution network interconnection mode of the area to be planned according to the voltage level range of each interconnection mode of the distribution network and the planning information of the area to be planned.

[0035] The third aspect of this document provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the distribution network planning method described in any of the foregoing embodiments is implemented.

[0036] A fourth aspect of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores an executable computer program, and when the computer program is executed by a processor, the distribution network planning method described in any of the aforementioned embodiments is implemented.

[0037] The distribution network planning method and device, computer equipment and computer-readable storage medium provided in this article can give the optimal parameter range corresponding to each backbone grid structure of the distribution network in the planning area, provide a favorable reference for planners, and facilitate planners to configure the backbone grid structure of the distribution network in the planning area according to these parameter ranges.

[0038] In order to make the above and other purposes, features and advantages of this article more obvious and easy to understand, the following specifically cites preferred embodiments and describes them in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of this article or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of this article. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A first flow chart of the distribution network planning method according to an embodiment of this invention is shown;

[0041] Figure 2 A flow chart showing an economic analysis of the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information in the embodiment of this document is shown;

[0042] Figure 3 A second flow chart of the distribution network planning method according to an embodiment of this invention is shown;

[0043] Figure 4 A flow chart showing an economic analysis of the cost of each interconnection mode of the distribution network corresponding to each voltage level information;

[0044] Figure 5 A first structural diagram of a distribution network planning device according to an embodiment of this invention is shown;

[0045] Figure 6 A second structural diagram of the distribution network planning device according to an embodiment of this invention is shown;

[0046] Figure 7 A flow chart showing a distribution network planning method according to a specific embodiment of this invention is shown;

[0047] Figure 8 A schematic diagram of the structure of a computer device according to an embodiment of this invention is shown. DETAILED DESCRIPTION

[0048] In order to make the technical features and effects of this article more obvious, the technical solution of this article is further explained below in conjunction with the accompanying drawings. This article may also have other different specific examples to illustrate or implement it. Any equivalent changes made by any technical personnel in this field within the scope of the claims belong to the protection scope of this article.

[0049] Figure 1 The first flow chart of the distribution network planning method of the embodiment of this invention is shown. This embodiment is used to solve the problem that in the prior art, when determining the form of the distribution network, only the types and distribution of the existing AC and DC sources, storage and loads in the planned area are considered, and the planning information is not considered. Therefore, it cannot meet future needs and has the defect of wasting financial resources in the long run. Specifically, as Figure 1 As shown in Figure 2, the distribution network planning method includes:

[0050] Step 110, determining multiple sets of parameter information in the area to be planned, the multiple sets of parameter information including: a set of initial parameter information and multiple sets of changed parameter information obtained according to the initial parameter information, wherein the initial parameter information can be determined according to the existing source-storage-load distribution in the area to be planned.

[0051] Specifically, each group of parameter information includes at least: AC / DC load information and new energy access information, the AC / DC load information includes the AC / DC load density ratio or AC / DC load amount (the AC / DC load density ratio can be calculated based on the AC / DC load amount, AC load density = annual maximum AC load amount / power supply area in the area to be planned, DC load density = annual maximum DC load capacity / power supply area in the area to be planned). New energy access information includes new energy penetration rate or new energy access amount (the new energy penetration rate can be calculated based on the new energy access amount, where the new energy penetration rate = new energy grid-connected power supply capacity / rated capacity of the distribution network).

[0052] Step 110 determines multiple sets of parameter information in the area to be planned, including: changing the initial parameter information according to a preset first rule to obtain multiple sets of changed parameter information. Specifically, the preset first rule records the change range and change step of the initial parameter information, for example, the change range of the AC / DC load density ratio is [0.1, 10], the change step is +0.1, and the change range of the new energy power penetration rate is [10%, 100%], and the change step is +5%.

[0053] Step 120, calculating the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information.

[0054] Among them, the backbone grid structure of the distribution network includes three forms: AC distribution network as the backbone, AC and DC distribution network as the backbone, and DC distribution network as the backbone.

[0055] When implementing this step, first determine the source-storage-load distribution corresponding to each group of parameter information based on the initial source-storage-load distribution (i.e., the existing source-storage-load distribution in the area to be planned), each group of parameter information and a pre-set source-storage-load distribution variation range; then, determine the source-storage-load access mode of each backbone grid structure of the distribution network corresponding to each group of parameter information based on the source-storage-load distribution corresponding to each group of parameter information; finally, determine the cost of each backbone grid structure of the distribution network corresponding to each group of parameter information based on the source-storage-load access mode of each backbone grid structure of the distribution network corresponding to each group of parameter information.

[0056] If a grid structure with an AC distribution network as the backbone is used, the AC load is directly connected to the AC distribution network; then, the maximum outgoing line distance of the DC line is calculated. If the geographical distance of the DC source-storage-load is less than or equal to the maximum outgoing line distance of the DC line, a DC microgrid can be formed and centrally connected to the AC distribution network through a DC / AC converter. Otherwise, the DC source-storage-load needs to be separately connected to the AC distribution network through a DC / AC converter; then, the total number of converters required for source-storage-load grid connection in the AC distribution network is calculated. Finally, the networking cost is determined based on the converters required for source-storage-load grid connection in the AC distribution network and the converters required on the AC distribution network grid structure. In specific implementation, the networking cost not only considers the cost of the converter equipment itself, but also the cost of the converter equipment connection line.

[0057] If a grid structure with both AC and DC distribution networks as the backbone is used, the AC load is directly connected to the AC distribution network, and the DC source-storage-load is directly connected to the DC distribution network. The network cost is determined based on the converters required on the AC and DC distribution network grid structure.

[0058] If a grid structure with a DC distribution network as the backbone is used, the DC source-storage-load is directly connected to the DC distribution network, and the maximum outgoing distance of the AC line is calculated. If the distance between multiple AC load points is less than or equal to the maximum outgoing distance of the AC line, an AC microgrid can be formed and centrally connected to the DC distribution network through AC / DC converters. Otherwise, it should be decentralized to the DC distribution network through AC / DC converters; then, the total number of converters required for source-storage-load grid connection in the AC / DC distribution network is calculated. The networking cost is determined based on the converters required for source-storage-load grid connection in the AC distribution network and the converters required on the DC distribution network grid structure.

[0059] Assume that one group of parameter information is: AC / DC load information X and new energy access information Y. Then the cost (unit: 10,000 yuan) of each backbone grid structure of the distribution network corresponding to this group of parameter information is shown in Table 1:

[0060] Table 1:

[0061]

[0062] Step 130, economic analysis is performed on the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information to determine the parameter range of each backbone grid structure of the distribution network. The economic analysis here is used to determine the most economical (i.e., the lowest cost) distribution network backbone grid structure corresponding to each set of parameter information based on the cost.

[0063] Specifically, Figure 2 As shown, step 130 performs an economic analysis on the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information, and determines the parameter range corresponding to each backbone grid structure of the distribution network, including:

[0064] Step 210, comparing the costs of the distribution network backbone grid structures corresponding to the various sets of parameter information, and taking the distribution network backbone grid structure with the minimum cost as the distribution network economic backbone grid structure corresponding to the various sets of parameter information.

[0065] Taking the data shown in Table 1 as an example, after comparing the costs of each backbone grid structure of the distribution network corresponding to this group of parameter information, it is concluded that the cost is the lowest when the DC distribution network is the backbone, and the economic backbone grid structure of the distribution network corresponding to this group of parameter information is the DC distribution network.

[0066] Step 220, according to the economic backbone grid structure of the distribution network corresponding to each group of parameter information, the parameter information is merged to obtain the parameter range corresponding to each backbone grid structure of the distribution network.

[0067] The parameter ranges corresponding to the backbone grid structures of the distribution network are shown in Table 2. Planners can refer to the parameter ranges corresponding to the backbone grid structures of the distribution network to plan the distribution network in the area to be planned. For the specific planning process, see step 140.

[0068] Table 2:

[0069]

[0070]

[0071] Step 140: Determine the backbone network structure of the distribution network in the area to be planned according to the parameter range of each backbone network structure of the distribution network and the planning information of the area to be planned.

[0072] The planning information of the area to be planned records the current and future AC and DC loads and new energy plans. This article does not make any specific restrictions on the planning information content of the planning area.

[0073] This embodiment can give the optimal parameter ranges corresponding to the backbone grid structures of the distribution network in the area to be planned, providing a favorable reference for planners, so that planners can configure the backbone grid structure of the distribution network in the area to be planned according to these parameter ranges.

[0074] In a further embodiment, in order to achieve accurate configuration of the distribution network, such as Figure 3 As shown, after the backbone grid structure is determined, the following steps are also included:

[0075] Step 150, determining multiple voltage level information in the area to be planned, the multiple voltage level information including: an initial voltage level information and multiple changed voltage level information obtained according to the initial voltage level information.

[0076] Specifically, the voltage level information refers to the number of AC and DC voltage levels. Step 150 determines the multiple voltage level information in the area to be planned, including: changing the initial voltage level information according to a preset second rule to obtain multiple changed voltage level information. Specifically, the preset second rule records the range of change and the step length of the initial voltage level number. For example, the range of change of the number of AC and DC voltage levels is [1,3], the corresponding AC voltage levels are 10kV, 6kV, 380V, the corresponding DC voltage levels are ±10kV, ±6kV, ±380V, and the step length is 1.

[0077] Step 160, calculating the cost of each interconnection mode of the distribution network corresponding to each voltage level information.

[0078] Among them, the distribution network interconnection methods include two methods: converter-based interconnection and flexible substation-based interconnection.

[0079] When implementing this step, first determine the number of core components when networking according to the various distribution network interconnection methods corresponding to each voltage level information, and the core components refer to flexible substations and converters; then calculate the cost of each distribution network interconnection method corresponding to each voltage level information according to the core components and their number when networking according to the various distribution network interconnection methods corresponding to each voltage level information.

[0080] The costs of each interconnection mode of the distribution network corresponding to each voltage level information are shown in Table III.

[0081] Table 3:

[0082]

[0083]

[0084] Step 170, economic analysis is performed on the cost of each interconnection mode of the distribution network corresponding to each voltage level information to determine the voltage level range of each interconnection mode of the distribution network. The economic analysis here is used to determine the most economical (i.e., the lowest cost) distribution network interconnection mode corresponding to each voltage level information based on the cost.

[0085] Specifically, Figure 4 As shown, step 170 performs an economic analysis on the cost of each interconnection mode of the distribution network corresponding to each voltage level information, and determines the voltage level range of each interconnection mode of the distribution network, including:

[0086] Step 410, comparing the costs of various distribution network interconnection modes corresponding to various voltage level information, and taking the distribution network interconnection mode with the lowest cost as the distribution network economic interconnection mode corresponding to various voltage level information.

[0087] Taking the data shown in Table 3 as an example, after comparing the costs of various distribution network interconnection methods corresponding to the same voltage level information, it is concluded that: when the voltage level is 1, the economic interconnection method of the distribution network is the interconnection method based on the converter; when the voltage level is 2, the economic interconnection method of the distribution network is the interconnection method based on the flexible substation; when the voltage level is 3, the economic interconnection method of the distribution network is the interconnection method based on the flexible substation.

[0088] Step 420, combining the voltage level information according to the economic interconnection modes of the distribution network corresponding to the voltage level information, and obtaining the voltage level ranges corresponding to the economic interconnection modes of the distribution network.

[0089] Continuing with the example of step 410, the voltage level ranges corresponding to various interconnection modes of the distribution network are shown in Table 4.

[0090] Table 4:

[0091]

[0092] Step 180, determine the distribution network interconnection mode of the area to be planned according to the voltage level range of each interconnection mode of the distribution network and the planning information of the area to be planned. The planning information of the area to be planned records the planning of future voltage levels, and the content of the planning information of the area to be planned is not specifically limited in this article.

[0093] This embodiment can give the optimal parameter ranges corresponding to each backbone grid structure of the distribution network in the planning area and the voltage level ranges corresponding to each interconnection mode of the distribution network, providing a favorable reference for planners and facilitating planners to configure the backbone grid structure and interconnection mode of the distribution network in the planning area according to these parameter ranges and voltage level ranges.

[0094] Based on the same inventive concept, this article also provides a distribution network planning device, as described in the following embodiments. Since the principle of solving the problem by the device is similar to that of the distribution network planning method, the implementation of the device can refer to the implementation of the distribution network planning method, and the repeated parts will not be repeated.

[0095] Specifically, Figure 5 As shown, the distribution network planning device includes:

[0096] The parameter division module 510 is used to determine multiple groups of parameter information in the area to be planned, each group of parameter information at least includes: AC and DC load information and new energy access information;

[0097] A first calculation module 520, used to calculate the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information;

[0098] The first analysis module 530 is used to perform an economic analysis on the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information, and determine the parameter range of each backbone grid structure of the distribution network;

[0099] The grid structure planning module 540 is used to determine the backbone grid structure of the distribution network in the area to be planned according to the parameter range of each backbone grid structure of the distribution network and the planning information of the area to be planned.

[0100] In a further embodiment, Figure 6 As shown, the distribution network planning device also includes:

[0101] The voltage level classification module 550 is used to determine multiple voltage level information in the area to be planned.

[0102] The second calculation module 560 is used to calculate the cost of each interconnection mode of the distribution network corresponding to each voltage level information.

[0103] The second analysis module 570 is used to perform an economic analysis on the cost of each interconnection mode of the distribution network corresponding to each voltage level information, and determine the voltage level range of each interconnection mode of the distribution network.

[0104] The interconnection mode planning module 580 is used to determine the distribution network interconnection mode of the area to be planned according to the voltage level range of each interconnection mode of the distribution network and the planning information of the area to be planned.

[0105] In specific implementation, a combination module may also be included to combine the parameter ranges of each backbone grid structure of the distribution network analyzed by the first analysis module 530 and the voltage level ranges of each interconnection mode of the distribution network analyzed by the second analysis module 570. The grid structure planning module 540 and the interconnection mode planning module 580 may determine the backbone grid structure of the area to be planned and the distribution network of the area to be planned based on the information recorded by the combination module.

[0106] In order to explain the technical solution of this article more clearly, the following is a detailed description of the distribution network planning of a certain area to be planned. Figure 7 As shown in the figure, the power distribution process in the area to be planned includes:

[0107] Step 710: Determine multiple sets of parameter information according to a preset first rule, each set of parameter information includes: AC / DC load density ratio and distributed power source penetration rate. The preset first rule allows the AC / DC load density ratio to vary within the interval [0.1, 1.0], with a variation step of 0.1, and the distributed power source penetration rate to vary within the interval [10%, 100%], with a variation step of 10%.

[0108] During specific implementation, one type of parameter information may be fixed first, and multiple groups of parameter information may be determined by changing another type of parameter information.

[0109] Step 720, networking is performed using the backbone grid structures of the distribution network according to each set of parameter information, and the cost of the backbone grid structures of the distribution network corresponding to each set of parameter information is calculated according to the networking result.

[0110] Since there are many combinations of parameter information, the following only gives examples of the cost of each backbone grid structure of the distribution network corresponding to a few sets of parameter information, as shown in Tables 5 to 8.

[0111] Table 5 When the penetration rate of distributed generation is 20%, the cost of each backbone grid structure of the distribution network corresponding to each group of parameter information (ten thousand yuan)

[0112]

[0113] Table 6 When the AC / DC load density ratio is 0.8, the cost of each backbone grid structure of the distribution network corresponding to each group of parameter information (ten thousand yuan)

[0114]

[0115] Table 7 When the penetration rate of distributed generation is 50%, the cost of each backbone grid structure of the distribution network corresponding to each group of parameter information (ten thousand yuan)

[0116]

[0117] Table 8 When the AC / DC load density ratio is 0.5, the cost of each backbone grid structure of the distribution network corresponding to each group of parameter information (ten thousand yuan)

[0118]

[0119] Table 5 shows the economic calculation results when the ratio of AC and DC load density changes when the new energy penetration rate is 20%. It can be seen that when the ratio is greater than 0.8, the grid structure with AC distribution network as the backbone is more economical; when it is less than 0.8, the grid structure with AC distribution network as the backbone becomes less economical. Therefore, when the ratio of AC and DC load density is greater than 0.8, the structure with AC distribution network as the backbone grid is more economical.

[0120] Table 6 shows the economic calculation results when the new energy penetration rate changes when the AC / DC load density ratio is 0.8. It can be seen that when the penetration rate is less than 20%, the grid structure with the AC distribution network as the backbone is more economical; when it is greater than 20%, the grid structure with the AC distribution network as the backbone becomes less economical. Therefore, when the AC / DC load density ratio is less than 20%, the structure with the AC distribution network as the backbone grid is more economical.

[0121] Table 7 shows the economic calculation results when the ratio of AC and DC load density changes when the new energy penetration rate is 50%. It can be seen that when the ratio is greater than 0.5, the grid structure with AC and DC distribution networks as the backbone is more economical; when it is less than 0.5, the grid structure with AC and DC distribution networks as the backbone becomes less economical. Therefore, when the AC and DC load density ratio is greater than 0.5, the structure with AC and DC distribution networks as the backbone is more economical.

[0122] Table 8 shows the economic calculation results when the new energy penetration rate changes when the AC / DC load density ratio is 0.5. It can be seen that when the penetration rate is greater than 50%, the grid structure with the DC distribution network as the backbone is more economical; when it is less than 50%, the grid structure with the DC distribution network as the backbone becomes less economical. Therefore, when the AC / DC load density ratio is greater than 50%, the structure with the DC distribution network as the backbone grid is more economical.

[0123] Step 730, performing an economic analysis on the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information, and determining the parameter range of each backbone grid structure of the distribution network, as shown in Table 9.

[0124] Table 9

[0125]

[0126] Step 740, determining that the number of AC and DC voltage levels varies within [1, 5] according to a preset second rule, with a variation step of 1. During implementation, step 710 and step 740 may be performed simultaneously.

[0127] Step 750, networking is performed using a converter-based interconnection method and a flexible substation-based interconnection method according to the number of voltage levels.

[0128] Step 760, calculating the cost of each interconnection method corresponding to each number of voltage levels, as shown in Table 10.

[0129] Table 10:

[0130]

[0131] It can be seen from the above table that when there is 1 AC voltage level and 1 DC voltage level, the economics of the AC / DC distribution network based on converters is more economical; when there are 2 or more AC / DC voltage levels, the economics of the AC / DC distribution network based on flexible substations is better.

[0132] Step 770, perform an economic analysis on the cost of each interconnection mode of the distribution network corresponding to each voltage level information, and determine the voltage level range of each interconnection mode of the distribution network, as shown in Table 11.

[0133] Table 11:

[0134]

[0135] Step 780, combining the parameter range corresponding to the distribution network backbone grid structure obtained in step 730 and the voltage level range of each interconnection mode of the distribution network obtained in step 770, obtains the reference conditions for distribution network planning, as shown in Table 12:

[0136] Table 12

[0137]

[0138]

[0139] Step 790, according to the distribution network planning reference conditions shown in Table 12 and the planning information of the area to be planned, determine the distribution network backbone grid structure and interconnection mode of the area to be planned.

[0140] The distribution network planning reference conditions determined in the embodiments of this article can provide the optimal parameter ranges corresponding to each backbone grid structure of the distribution network in the planning area and the optimal voltage level number ranges corresponding to each interconnection mode, providing a favorable reference for planners, so that planners can configure the backbone grid structure of the distribution network in the planning area according to these parameter ranges, and configure the distribution network interconnection mode in the planning area according to the voltage level data range.

[0141] In one embodiment of the present invention, a computer device is also provided, such as Figure 8The structure diagram of the computer device of the embodiment of this article is shown. The computer device 802 may include one or more processors 804, such as one or more central processing units (CPUs), and each processing unit may implement one or more hardware threads. The computer device 802 may also include any memory 806, which is used to store any kind of information such as code, settings, data, etc. Non-limiting, for example, the memory 806 may include any one or more combinations of the following: any type of RAM, any type of ROM, flash memory device, hard disk, optical disk, etc. More generally, any memory can use any technology to store information. Further, any memory can provide volatile or non-volatile retention of information. Further, any memory can represent a fixed or removable component of the computer device 802, and the memory is used to store a computer program that can be run on the processor 804, and the processor 804 implements the distribution network planning method described in any of the aforementioned embodiments when executing the computer program. In one case, when the processor 804 executes the associated instructions stored in any memory or a combination of memories, the computer device 802 can perform any operation of the associated instructions. The computer device 802 also includes one or more drive mechanisms 808 for interacting with any storage, such as a hard disk drive mechanism, an optical disk drive mechanism, etc.

[0142] The computer device 802 may also include an input / output module 810 (I / O) for receiving various inputs (via input devices 812) and for providing various outputs (via output devices 814). A specific output mechanism may include a presentation device 816 and an associated graphical user interface (GUI) 818. In other embodiments, the input / output module 810 (I / O), the input device 812, and the output device 814 may not be included, and the computer device 802 may be used as a computer device in a network. The computer device 802 may also include one or more network interfaces 820 for exchanging data with other devices via one or more communication links 822. One or more communication buses 824 couple the components described above together.

[0143] The communication link 822 may be implemented in any manner, for example, through a local area network, a wide area network (e.g., the Internet), a point-to-point connection, etc., or any combination thereof. The communication link 822 may include any combination of hardwired links, wireless links, routers, gateway functions, name servers, etc. governed by any protocol or combination of protocols.

[0144] The embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the distribution network planning method described in any of the above embodiments is executed.

[0145] The embodiments of this document also provide a computer-readable instruction, wherein when a processor executes the instruction, the program therein causes the processor to execute the distribution network planning method described in any of the above embodiments.

[0146] It should be understood that in the various embodiments of this document, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this document.

[0147] It should also be understood that in the embodiments of this article, the term "and / or" is only a description of the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0148] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this article.

[0149] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0150] In the several embodiments provided herein, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or can be electrical, mechanical or other forms of connection.

[0151] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of this article.

[0152] In addition, each functional unit in each embodiment of this invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional unit.

[0153] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this article is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of this article. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0154] Specific embodiments are used in this article to illustrate the principles and implementation methods of this article. The description of the above embodiments is only used to help understand the methods and core ideas of this article. At the same time, for general technicians in this field, according to the ideas of this article, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on this article.

Claims

1. A distribution network planning method, characterized in that: include: Determine multiple groups of parameter information in the area to be planned, each group of parameter information at least includes: AC and DC load information and new energy access information, the new energy access information includes new energy penetration rate or new energy access amount; Calculate the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information; The calculation further includes determining the source-storage-load distribution corresponding to each set of parameter information according to the initial source-storage-load distribution, each set of parameter information and a preset source-storage-load distribution variation range; According to the source-storage-load distribution corresponding to each set of parameter information, determining the source-storage-load access mode of each backbone grid structure of the distribution network corresponding to each set of parameter information; Determine the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information according to the source-storage-load access mode of each backbone grid structure of the distribution network corresponding to each set of parameter information; perform an economic analysis on the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information, and determine the parameter range of each backbone grid structure of the distribution network; If a grid structure with both AC and DC distribution networks as the backbone is used, the AC load is directly connected to the AC distribution network, and the DC source-storage-load is directly connected to the DC distribution network. The network cost is determined based on the converters required on the AC and DC distribution network grid structure. If a grid structure with a DC distribution network as the backbone is used, the DC source-storage-load is directly connected to the DC distribution network, and the maximum outgoing line distance of the AC line is calculated. If the distance between multiple AC load points is less than or equal to the maximum outgoing line distance of the AC line, the AC microgrid is formed and centrally connected to the DC distribution network through AC / DC converters; Otherwise, the DC distribution network should be decentralized through AC / DC converters, and the total number of converters required for source-storage-load grid connection in the AC / DC distribution network should be calculated. The network cost should be determined based on the converters required for source-storage-load grid connection in the AC distribution network and the converters required for the DC distribution network grid structure. Determine the backbone grid structure of the distribution network in the area to be planned according to the parameter range of each backbone grid structure of the distribution network and the planning information of the area to be planned; Changing the voltage level information according to a preset second rule to obtain a plurality of voltage level information; Calculate the cost of each interconnection mode of the distribution network corresponding to each voltage level information; Conduct economic analysis on the cost of each interconnection mode of the distribution network corresponding to each voltage level information, and determine the voltage level range of each interconnection mode of the distribution network; The distribution network interconnection mode of the area to be planned is determined according to the voltage level range of each interconnection mode of the distribution network and the planning information of the area to be planned.

2. The method according to claim 1, characterized in that Determining multiple sets of parameter information in the area to be planned includes: The AC / DC load information and the new energy access information are changed according to a preset first rule, and each piece of AC / DC load information and new energy access information is used as a group of parameter information.

3. The method according to claim 1, characterized in that An economic analysis is performed on the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information to determine the parameter range of each backbone grid structure of the distribution network, including: Comparing the costs of the distribution network backbone grid structures corresponding to the various sets of parameter information, and taking the distribution network backbone grid structure with the minimum cost as the distribution network economic backbone grid structure corresponding to the various sets of parameter information; According to the economic backbone grid structure of the distribution network corresponding to each group of parameter information, the parameter information is merged to obtain the parameter range corresponding to each backbone grid structure of the distribution network.

4. The method according to claim 1, characterized in that The economic analysis of the cost of each interconnection mode of the distribution network corresponding to each voltage level information to determine the voltage level range of each interconnection mode of the distribution network includes: Compare the costs of various interconnection modes of distribution networks corresponding to various voltage level information, and take the interconnection mode of distribution networks with the lowest cost as the economic interconnection mode of distribution networks corresponding to various voltage level information; The voltage level information is combined according to the economic interconnection modes of the distribution network corresponding to the voltage level information to obtain the voltage level ranges corresponding to the economic interconnection modes of the distribution network.

5. A distribution network planning device, characterized in that: include: A parameter division module is used to determine multiple groups of parameter information in the area to be planned, each group of parameter information at least includes: AC and DC load information and new energy access information, and the new energy access information includes new energy penetration rate or new energy access amount; A first calculation module is used to calculate the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information; The calculation further includes determining the source-storage-load distribution corresponding to each set of parameter information according to the initial source-storage-load distribution, each set of parameter information and a preset source-storage-load distribution variation range; Determine the source-storage-load access mode of each backbone grid structure of the distribution network corresponding to each group of parameter information according to the source-storage-load distribution corresponding to each group of parameter information; determine the cost of each backbone grid structure of the distribution network corresponding to each group of parameter information according to the source-storage-load access mode of each backbone grid structure of the distribution network corresponding to each group of parameter information; The first analysis module is used to perform an economic analysis on the cost of each backbone grid structure of the distribution network corresponding to each set of parameter information, and determine the parameter range of each backbone grid structure of the distribution network; If a grid structure with both AC and DC distribution networks as the backbone is used, the AC load is directly connected to the AC distribution network, and the DC source-storage-load is directly connected to the DC distribution network. The network cost is determined based on the converters required on the AC and DC distribution network grid structure. If a grid structure with a DC distribution network as the backbone is used, the DC source-storage-load is directly connected to the DC distribution network, and the maximum outgoing line distance of the AC line is calculated. If the distance between multiple AC load points is less than or equal to the maximum outgoing line distance of the AC line, the AC microgrid is formed and centrally connected to the DC distribution network through AC / DC converters; Otherwise, the DC distribution network should be decentralized through AC / DC converters, and the total number of converters required for source-storage-load grid connection in the AC / DC distribution network should be calculated. The network cost should be determined based on the converters required for source-storage-load grid connection in the AC distribution network and the converters required for the DC distribution network grid structure. A grid structure planning module, used to determine the backbone grid structure of the distribution network in the area to be planned according to the parameter range of each backbone grid structure of the distribution network and the planning information of the area to be planned; A voltage level classification module, used to determine information of multiple voltage levels in the area to be planned; The second calculation module is used to calculate the cost of each interconnection mode of the distribution network corresponding to each voltage level information; The second analysis module is used to perform an economic analysis on the cost of each interconnection mode of the distribution network corresponding to each voltage level information, and determine the voltage level range of each interconnection mode of the distribution network; The interconnection mode planning module is used to determine the distribution network interconnection mode of the area to be planned according to the voltage level range of each interconnection mode of the distribution network and the planning information of the area to be planned.

6. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the distribution network planning method according to any one of claims 1 to 4 is implemented.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores an executable computer program, and when the computer program is executed by a processor, the distribution network planning method according to any one of claims 1 to 4 is implemented.

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