Mini distribution network architecture layout method and device for power distribution system

Abstract

The present application provides a method and device for the layout of a mini distribution network architecture for a distribution system, which relates to the field of power systems. The method for the layout of a mini distribution network architecture includes: obtaining distribution lines in a distribution system to be laid out; analyzing the layout directions of multiple distribution branches to determine multiple bifurcation nodes from multiple nodes of the distribution line; dividing multiple bifurcation nodes into levels along the distribution line to obtain multiple target nodes corresponding to different levels; and setting a node controller in the distribution line to arrange the distribution system into an architecture in which multiple mini distribution networks are connected. The present application determines the bifurcation nodes existing in the distribution line and divides the multiple bifurcation nodes into levels, realizes targeted management of each node and each user by controlling the bifurcation nodes, and uses the adjustment capability of the node controller to split the distribution system into a smaller architecture in which mini distribution networks are connected, and realizes the optimization management of the internal voltage of the distribution system substation by accessing the node controller.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a method and device for laying out a mini distribution network architecture for a power distribution system. Background Art

[0002] As users' electricity demand continues to increase, especially in some remote urban and rural areas, mountainous rural areas and other areas, the distribution network foundation is relatively weak, the funds and personnel invested in the construction of the distribution network are insufficient, and the construction and transformation of the distribution network are relatively slow, resulting in the user end using a voltage lower than the standard power supply voltage, referred to as low voltage; in addition, in the distribution system substation, peak load low voltage and valley load high voltage phenomena exist simultaneously.

[0003] In the relevant technology, in view of the low voltage and high voltage problems currently faced by distribution network substations, the traditional management methods for distribution network substations are: 1. Adjusting the tap position of the distribution transformer; 2. In view of the voltage over-limit problem caused by the imbalance of three-phase load, changing the phase of the corresponding user access to balance the three-phase users as much as possible; 3. For the situation of circuitous power supply of low-voltage lines, the circuitous lines can be diverted; 4. For the situation where the main line diameter is too small, the low-voltage main line can be replaced with a larger line diameter; 5. Carry out substation reconstruction, substation relocation and new substation construction.

[0004] The above measures are mainly to solve the traditional low voltage problem, which has limited regulation ability, high cost, low efficiency and other problems, and the ability to manage the high voltage problem caused by the access of distributed new energy is extremely limited. At the same time, with the continuous influx of distributed new energy, charging piles and energy storage equipment, the distribution system area must require real-time dynamic voltage management, which cannot be achieved by relying on traditional methods. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a method and device for laying out a mini distribution network architecture for a power distribution system, which solves the problem of unsatisfactory real-time dynamic management of voltage in the distribution system substation.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a method for laying out a mini distribution network architecture for a distribution system, the method comprising: obtaining a distribution line in a distribution system to be laid out, the distribution line comprising a plurality of distribution branches and extending through a substation and a transformer to connect to a plurality of nodes and a plurality of users; analyzing the layout directions of the plurality of distribution branches to determine a plurality of bifurcation nodes from a plurality of nodes of the distribution line; taking the transformer as a starting point, dividing the plurality of bifurcation nodes into levels along the distribution line to obtain a plurality of target nodes corresponding to different levels; and setting a node controller in the distribution line based on the positions of the plurality of target nodes to lay out the distribution system as an architecture in which a plurality of mini distribution networks are connected.

[0008] According to the first aspect of the embodiment of the present application, the bifurcation node corresponds to a group of upstream branches and more than two groups of downstream branches, and a group of upstream branches and more than two groups of downstream branches are located between two adjacent bifurcation nodes; a group of upstream branches includes one distribution branch or multiple distribution branches, and each group of downstream branches includes one distribution branch or multiple distribution branches.

[0009] According to the first aspect of the embodiment of the present application, the end of the distribution branch is one of a transformer, a user and a node; when a group of upstream branches includes multiple distribution branches, the multiple distribution branches are connected in series; when each group of downstream branches includes multiple distribution branches, the multiple distribution branches are connected in series.

[0010] According to the first aspect of the embodiment of the present application, the aforementioned method takes the transformer as the starting point and divides the multiple bifurcation nodes into levels along the distribution line to obtain multiple target nodes corresponding to different levels, including: taking the transformer as the starting point, determining the bifurcation node closest to the transformer as the first-level target node; determining the bifurcation node closest to the user in the distribution system substation as the last-level target node; based on the first-level target node and the last-level target node, determining the remaining target nodes from the multiple bifurcation nodes; taking the first-level target node as the starting point, dividing the remaining target nodes into levels in turn to obtain intermediate-level target nodes.

[0011] According to the first aspect of the embodiment of the present application, based on the positions of multiple target nodes, a node controller is set in the distribution line to arrange the distribution line into an architecture in which multiple mini distribution networks are connected, including: taking the final target node as the starting point, sequentially determining a group of upstream branches corresponding to the final target node, the intermediate target node and the first target node as the target branches; and selectively setting a node controller on the target branch to arrange the distribution line into an architecture in which multiple mini distribution networks are connected.

[0012] According to a first aspect of an embodiment of the present application, when a group of upstream branches corresponding to a final target node and an intermediate target node include multiple distribution branches, a distribution branch farthest from itself is determined as the target branch.

[0013] According to the first aspect of the embodiment of the present application, the aforementioned mini distribution network architecture layout method also includes: selectively setting a node controller on the outlet side of the transformer and the inlet side of a single user among multiple users.

[0014] In the second aspect, an embodiment of the present application provides a mini distribution network architecture layout device for a distribution system, which includes an acquisition module, an analysis module, a division module and a setting module; the acquisition module is used to acquire the distribution lines in the distribution system to be laid out, and the distribution lines include multiple distribution branches and extend to multiple nodes and multiple users via substations and transformers; the analysis module is used to analyze the layout directions of the multiple distribution branches to determine multiple bifurcation nodes from the multiple nodes of the distribution line; the division module is used to take the transformer as the starting point, and divide the multiple bifurcation nodes along the distribution line into levels to obtain multiple target nodes corresponding to different levels; the setting module is used to set a node controller in the distribution line based on the positions of the multiple target nodes, so as to arrange the distribution system into an architecture in which multiple mini distribution networks are connected.

[0015] In a third aspect, an embodiment of the present application provides an electronic device, comprising: a processor, a memory, and a program stored in the memory and executable on the processor, wherein when the program is executed by the processor, the method for laying out a mini distribution network architecture for a power distribution system in the first aspect described above is implemented.

[0016] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing a program or instruction. When the program or instruction is executed by a processor, the mini distribution network architecture layout method for a distribution system in the aforementioned first aspect is implemented.

[0017] The present invention provides a method and device for mini distribution network architecture layout for power distribution system. Compared with the prior art, it has the following beneficial effects:

[0018] This application proposes a node controller-based governance strategy for the problem of over-limit voltage in substations. By analyzing the layout directions of multiple distribution branches in the distribution lines, the actual characteristics of the distribution system to be laid out are deeply understood, the bifurcation nodes existing in the distribution lines are determined and the multiple bifurcation nodes are hierarchically divided. By controlling the bifurcation nodes, targeted governance of each node and each user is achieved. By utilizing the voltage regulation capability of the node controller, the distribution system is split into multiple smaller mini-distribution networks connected to each other. From the perspective of determining the bifurcation nodes, it is explored how to access the node controller to achieve optimal governance of the internal voltage in the distribution system substation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a flow chart of a method for laying out a mini distribution network architecture for a power distribution system provided in an embodiment of the present application;

[0021] Figure 2 It is a schematic diagram of the conventional architecture layout of the UPQC provided in the embodiment of the present application;

[0022] Figure 3 yes Figure 1 An exemplary flow chart of S130;

[0023] Figure 4 It is a typical power distribution system area schematic diagram provided in an embodiment of the present application;

[0024] Figure 5 It is a schematic diagram of a first type of voltage anomaly occurring in a distribution system substation provided by an embodiment of the present application;

[0025] Figure 6 It corresponds to Figure 5 The schematic diagram of the mini distribution network architecture layout of the first type of voltage anomaly is shown;

[0026] Figure 7 It is a schematic diagram of a second voltage anomaly occurring in a distribution system substation provided by an embodiment of the present application;

[0027] Figure 8 It corresponds to Figure 7 The schematic diagram of the second mini distribution network architecture layout with voltage anomaly is shown;

[0028] Fig. 9 is another schematic diagram of the layout of a mini distribution network architecture provided in an embodiment of the present application;

[0029] Fig.10 It is another schematic diagram of the layout of a mini distribution network architecture provided in an embodiment of the present application;

[0030] Fig.11 It is a structural schematic diagram of a mini distribution network architecture layout device for a power distribution system provided in an embodiment of the present application;

[0031] Fig.12 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0034] The embodiments of the present application solve the problem of unsatisfactory real-time dynamic voltage management in the distribution system substation by providing a method and device for laying out a mini distribution network architecture for the distribution system.

[0035] The technical solution in the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0036] In recent years, with the significant improvement of residents' consumption level, users' electricity demand has been increasing. Especially in some remote urban and rural areas, mountainous rural areas and other areas, the foundation of the distribution network is relatively weak, and the construction and transformation of the distribution network are relatively slow, resulting in the situation that the voltage used at the user end is lower than the standard power supply voltage, referred to as low voltage. Low voltage has a great impact on the quality of electricity consumption of users, but its governance has been difficult to achieve good results, mainly because of the following reasons: First, the number of low voltage problems is large, the distribution is wide, and the governance is difficult, and the investment required to completely solve it is large; second, the low voltage problem is a dynamic development problem, and the situation of "one rises while the other falls" is relatively common, and the overall governance effect is not obvious; third, the sources of low voltage problems are diverse, including both equipment reasons and management reasons. More low voltage problems are the result of multiple reasons coupling, and it is difficult to grasp the key points of grassroots governance; fourth, the impact problem is prominent, and the phenomenon of low voltage at peak load and high voltage at valley load exists at the same time.

[0037] In the relevant technology, in view of the low voltage and high voltage problems currently faced by distribution network substations, the traditional management methods for distribution network substations are: 1. Adjusting the tap position of the distribution transformer; 2. In view of the voltage over-limit problem caused by the imbalance of three-phase load, changing the phase of the corresponding user access to balance the three-phase users as much as possible; 3. For the situation of circuitous power supply of low-voltage lines, the circuitous lines can be diverted; 4. For the situation where the main line diameter is too small, the low-voltage main line can be replaced with a larger line diameter; 5. Carry out substation reconstruction, substation relocation and new substation construction.

[0038] The above measures are mainly to solve the traditional low voltage problem, and there are problems such as limited regulation capacity, high cost, and low efficiency, and the ability to manage the high voltage problems caused by the access of distributed new energy is extremely limited. At the same time, under the background of dual carbon, a large number of distributed photovoltaics directly poured into the distribution network area, and the rapid development of photovoltaic installations brought about difficulties in grid connection and insufficient absorption, which began to be exposed, and some places had to stop the grid connection of distributed photovoltaics. However, according to analysis and research, a large proportion of the current suspension of distributed photovoltaics is not due to the insufficient actual carrying capacity of the area, but because of the power backflow caused by photovoltaic access, which caused high voltage problems in some nodes of the area. Therefore, just because the voltage of one or several nodes is too high, the distributed photovoltaics in the entire area are stopped, which leads to the extremely insufficient utilization of the carrying capacity of the area, which seriously restricts the implementation of the "dual carbon" strategy.

[0039] The advantage of power electronic equipment is that it can achieve stepless and smooth voltage regulation and real-time dynamic regulation. However, the current application mode of power electronic equipment in substation voltage management is limited to a single device installed for a single substation voltage management. The existing power electronic-based management equipment has problems such as high cost, large size, low efficiency, and low reliability. It is not widely used in distribution network substations. In order to achieve highly optimized voltage management in a substation, multiple management equipment is often used, which is impractical in the current distribution network substations.

[0040] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0041] The following first introduces a mini distribution network architecture layout method for a power distribution system provided in an embodiment of the present application.

[0042] A schematic diagram of a flow chart of a mini distribution network architecture layout method for a power distribution system provided in an embodiment of the present application is as follows: Figure 1 As shown, the mini distribution network architecture layout method may include the following steps S110-S140.

[0043] S110: Obtain a distribution line in a distribution system to be laid out, where the distribution line includes a plurality of distribution branches and is extended to connect to a plurality of nodes and a plurality of users via a substation and a transformer.

[0044] S120: Analyze the layout directions of multiple distribution branches to determine multiple bifurcation nodes from multiple nodes of the distribution line.

[0045] S130, taking the transformer as the starting point, dividing the multiple bifurcation nodes along the distribution line into different levels to obtain multiple target nodes corresponding to different levels.

[0046] S140. Based on the locations of the multiple target nodes, a node controller is set in the distribution line to arrange the distribution system into an architecture in which multiple mini distribution networks are connected.

[0047] In the embodiment of the present application, the mini distribution network is a small distribution network substation, and the bifurcation node corresponds to multiple downstream branches. The node controller installed based on the bifurcation node can realize piezoelectric regulation for multiple users. The node controller, as a power electronic device, can split the distribution system substation into smaller substations, that is, split the distribution system substation into multiple mini distribution networks.

[0048] Based on this, the present application is not limited to the management of "one device, one station". Taking into account each node and each user within the distribution system station, the voltage regulation capability of the node controller is used to propose the idea of ​​a "mini distribution network". By connecting power electronic equipment such as node controllers, the distribution system station is further divided into smaller mini distribution networks, achieving the management effects achieved by traditional methods such as station splitting and new construction at a very low cost.

[0049] It should be noted that the nodes include a first node and a second node. The first node is an actual pole in the distribution line, and the second node is a location where the lines cross-contact. For example, the contact location between a line with two ends connected to the first node and a line with two ends connected to the first node and a user is the second node.

[0050] It is understandable that with the development of power electronics technology, many power electronics equipment provide new means for voltage management in the distribution network; the distribution network can be managed by UPQC devices. Figure 2 As shown, the UPQC device first connects a rectifier in parallel at the grid end to generate a DC voltage, and then inverts the DC voltage into AC power through an inverter. This AC power is added to the grid through a coupling transformer connected in series to the grid, so that the load side voltage is superimposed with an AC voltage generated by the inverter on the basis of the grid voltage, thereby achieving the adjustment of the grid voltage.

[0051] When the grid voltage is too low, use UPQC to add a voltage with the same phase as the grid voltage to increase the voltage; when the grid voltage is too high, use UPQC to add a voltage with the opposite phase to the grid voltage to reduce the voltage, so that the load voltage returns to the standard voltage of 220V.

[0052] In one example, in addition to the node controller, the present application may also use other power electronic equipment to achieve optimization and management of the distribution system substation.

[0053] The above is a specific implementation method of a mini distribution network architecture layout method for a distribution system provided in an embodiment of the present application. By analyzing the layout direction of multiple distribution branches in the distribution line, the actual characteristics of the distribution system to be laid out are deeply understood, the bifurcation nodes existing in the distribution line are determined and the multiple bifurcation nodes existing are hierarchically divided. By controlling the bifurcation nodes, targeted management of each node and each user is achieved. By utilizing the voltage regulation capability of the node controller, the distribution system is split into multiple smaller mini distribution networks connected to each other. From the perspective of determining the bifurcation nodes, it is explored how to access the node controller to achieve optimal management of the voltage within the distribution network substation.

[0054] In some embodiments, a bifurcation node corresponds to a group of upstream branches and more than two groups of downstream branches, and a group of upstream branches and more than two groups of downstream branches are located between two adjacent bifurcation nodes; a group of upstream branches includes one distribution branch or multiple distribution branches, and each group of downstream branches includes one distribution branch or multiple distribution branches.

[0055] In the embodiments of the present application, it can be understood that there are multiple nodes in the distribution line, among which there are more than one group of downstream branches led by some of the nodes, that is, there are bifurcation nodes in the distribution line; further, in the distribution line, a group of upstream branches may also have more than one distribution branch, that is, there may be conventional ordinary nodes in a group of upstream branches, and there is only one group of downstream branches corresponding to the ordinary nodes.

[0056] In some embodiments, the end of the distribution branch is one of a transformer, a user and a node; when a group of upstream branches includes multiple distribution branches, the multiple distribution branches are connected in series; when each group of downstream branches includes multiple distribution branches, the multiple distribution branches are connected in series.

[0057] In the embodiments of the present application, it can be understood that in addition to the connection nodes at both ends of the distribution branch, at the starting side of the distribution line, the end of the distribution branch can be connected to the transformer; at the end of the distribution line, the end of the distribution branch can be connected to the user.

[0058] In some embodiments, Figure 3As shown, the transformer is used as the starting point, and multiple bifurcation nodes are divided into levels along the distribution line to obtain multiple target nodes corresponding to different levels. That is, S130 may specifically include the following steps:

[0059] S210: Taking the transformer as the starting point, determining the bifurcation node closest to the transformer as the primary target node.

[0060] S220: Determine the bifurcation node closest to the user in the distribution system substation as the final target node.

[0061] S230 , based on the first-level target node and the final-level target node, determine the remaining target nodes from the multiple forked nodes.

[0062] S240, starting from the first-level target node, the remaining target nodes are divided into levels in sequence to obtain intermediate-level target nodes.

[0063] In the embodiments of the present application, it can be understood that in the entire distribution line, multiple fork nodes can be divided into levels, and different levels of fork nodes have different influences on downstream lines. Specifically, multiple fork nodes can be divided into first-level target nodes, intermediate-level target nodes and final-level target nodes according to their influences; thus, a node controller can be set based on the first-level target nodes, intermediate-level target nodes and final-level target nodes, so that the distribution system substation can form multiple mini distribution networks with different coverage areas.

[0064] In some embodiments, based on the locations of the multiple target nodes, a node controller is set in the distribution line to arrange the distribution line into a structure in which multiple mini distribution networks are connected. That is, S140 may specifically include the following steps:

[0065] S310, taking the final target node as the starting point, sequentially determining a group of upstream branches corresponding to the final target node, the intermediate target node and the first target node as the target branches.

[0066] S320. Selectively set a node controller on the target branch to arrange the distribution line into a structure in which multiple mini distribution networks are connected.

[0067] In the embodiment of the present application, it can be understood that after the multiple fork nodes are divided into levels, the number of node controllers to be installed and the installation position of each node controller can be determined according to actual needs; based on this, a corresponding group of upstream branches can be determined as target branches according to the positions of the final target node, the intermediate target node and the first-level target node in the distribution line. A node controller can be set on each target branch, or some of the multiple target branches can be selected to set the node controller. The number of node controllers to be installed can be determined based on the actual layout requirements of the mini distribution network.

[0068] In one example, when a group of upstream branches corresponding to the final target node and the intermediate target node include multiple distribution branches, a distribution branch farthest from itself is determined as the target branch.

[0069] In the embodiments of the present application, it can be understood that when a group of upstream branches corresponding to the final-level target node and the intermediate-level target node include multiple distribution branches, each of the multiple distribution branches can be selected as the target branch, but the closer the distribution branch is to the upstream of the distribution system substation, the greater the number of nodes covered by the adjustment range of the node controller.

[0070] Based on this, whether it is a final target node or an intermediate target node, when its corresponding set of upstream branches includes multiple distribution branches, in order to increase the adjustment range of the node controller, the distribution branch farthest from itself can be determined as the target branch.

[0071] Please refer to Figure 4-Figure 10 , this application provides a specific implementation example of the aforementioned mini distribution network architecture layout method for a power distribution system;

[0072] Figure 4 The figure shows a typical distribution system substation schematic diagram; the high voltage of the transmission line on the left side of the transformer is converted into low voltage by the transformer to supply the electricity users in the substation. The voltage problem in the substation is mainly reflected in the following aspects: since the distance between each user and the substation transformer is different, the closer the user is to the transformer, the closer the user voltage is to the transformer outlet voltage, and the farther away from the transformer, the more the user voltage drops compared to the transformer outlet voltage.

[0073] Without modifying the substation lines, the only means of voltage regulation in the substation is to adjust the gear of the substation transformer to increase or decrease the voltage on the inlet side of the substation. Obviously, this adjustment method is a kind of adjustment of the overall voltage of the substation. Under normal circumstances, the distribution of voltage among users in the substation is uneven, some are high and some are low. Therefore, when a user has a low voltage, if the transformer gear is increased, it is easy to increase the voltage of the user with a higher voltage, resulting in a high voltage situation, and vice versa. And considering that the substation transformers commonly used now have only 3-5 gears, it is difficult to achieve smooth adjustment, so the situation described above is more likely to occur.

[0074] Based on this, the more users there are in the substation, the wider and more asymmetrical the distribution of the distribution lines is, the more difficult it is to solve the voltage problem by adjusting the transformer; conversely, if the substation becomes smaller, it is easier to solve the voltage problem by adjusting the transformer.

[0075] The voltage management solution provided in this application is based on low-cost power electronic voltage regulation equipment. By installing a node controller inside the substation, the substation is "split" and then the node controller is used to perform voltage management on each split mini distribution network separately. In this way, the voltage of each user in the substation can be adjusted as evenly as possible at the lowest possible cost, and high and low voltage situations will not occur.

[0076] In one example, when a distribution system area Figure 5 The first voltage abnormality is shown in Figure 1, that is, the voltage of users in some areas is low, and the voltage of users in some areas is normal but high, that is, Figure 5 The voltage of users 5-10 is low, and the voltage of users 1-4 is high. This situation cannot be solved by adjusting the gear of the substation transformer, because this method can only adjust the voltage of the entire power grid. When the gear is increased, the low voltage problem of users 5-10 may be solved, but users 1-4 will have a new high voltage problem.

[0077] In this regard, based on the voltage management solution of this application, by installing a node controller inside the substation, the substation is "split" to achieve separate regulation of the voltage of users in the two areas, such as Figure 6 As shown, first, the transformer in the substation is lowered to further reduce the voltage of users 1-4 to a normal range, thereby reducing the risk of voltage exceeding the limit; the node controller installed between node 2 and node 6 raises the voltage after node 6, thereby improving the voltage in area 2 as a whole, and raising the voltage of users 5-10 to a normal range, thereby achieving normal voltage for all users in the substation.

[0078] It should be noted that the node controller is equivalent to a stepless, automatically regulating transformer; this solution is equivalent to dividing the substation into two mini distribution networks; users 1-4 belong to one mini distribution network, and users 5-10 belong to another mini distribution network.

[0079] In one example, the current large-scale photovoltaic access leads to high voltage caused by power backflow in the substation area, which can also be well solved by the governance solution based on this application.

[0080] For example, when the station area appears Figure 7 In the situation shown: the power backflow occurs due to the household photovoltaic access of users 8-10 in the substation, which will cause the voltage of users in the substation to increase. Among them, the users connected to photovoltaics are the most serious, that is, users 8-10 are the most serious. The voltage of nearby users will also be raised, that is, users 5-7 will be raised, and users farther away may also have a certain increase, that is, users 1-4 will have a certain increase.

[0081] For such high voltage problems, such as Figure 8As shown, the problem can also be solved by installing a node controller inside the substation. In the case of no photovoltaic access, taking the top path as an example, since the voltage on the outlet side of the substation is basically stabilized within the normal range by the large power grid, the voltage at node 1 is usually normal. According to the normal power flow, that is, node 1→node 2→node 6→node 10→node 11, the voltage at node 1>node 2>node 6>node 10>node 11.

[0082] After connecting to photovoltaic power, power backflow will occur, especially when the photovoltaic power generation is greater than the power of the entire substation load, the power backflow is serious. Taking the top path as an example, the power flow direction becomes: node 11→node 10→node 6→node 2→node 1, node 11 voltage>node 10 voltage>node 6 voltage>node 2 voltage>node 1 voltage.

[0083] By installing a node controller between node 2 and node 6, the voltage of node 6 is lowered to the normal range, and the overall voltage reduction of area 2 is achieved to solve the high voltage problem; it can be seen that this solution is equivalent to dividing the substation into two mini distribution networks: users 1-4 belong to one mini distribution network, and users 5-10 belong to another mini distribution network.

[0084] It should be noted that the installed node controller is a power electronic device that can be adjusted in real time. That is, when the photovoltaic power generation changes, the voltage of the entire substation can be maintained normal through reasonable settings.

[0085] Since the power flow in area 2 is: node 11 → node 10 → node 7 → node 8 → node 9, the voltage of node 11 > node 10 > node 7 > node 8 > node 9; the following situation may occur when the above solution is applied: the voltage of node 6 is adjusted down too much to ensure that the voltage of users 8 to 10 does not exceed the limit, resulting in low voltage for users 6 and 7. In this case, if Fig. 9 As shown, the following solutions can be adopted:

[0086] By installing a node controller between node 6 and user 8, the voltage of users 8-10 is reduced to solve their high voltage problem; by installing a node controller between node 6 and user 5, the voltage of users 5-7 is increased to solve their high voltage problem. It can be seen that this solution is equivalent to dividing the substation into three mini distribution networks: users 1-4 belong to a mini distribution network, users 5-7 belong to a mini distribution network, and users 8-10 belong to a mini distribution network.

[0087] In some embodiments, the aforementioned mini distribution network architecture layout method may further specifically include: S410, selectively setting a node controller at the transformer outlet side and the inlet side of a single user among multiple users.

[0088] In the embodiment of the present application, in the distribution system substation, in addition to installing a node controller based on the location of the bifurcation node, the node controller can also be connected to the transformer outlet side of the distribution system substation and the inlet side of a single user as needed.

[0089] like Fig.10 As shown, a node controller based on power electronics is set on the outlet side of the transformer. Compared with the gear adjustment of the traditional transformer, it can realize real-time dynamic adjustment of the voltage and a larger adjustment range, which is beneficial to improving the adjustment ability of the overall voltage of the distribution system substation; a node controller is set on the inlet side of a single user, so that the voltage can be managed separately for the user, and the power supply quality requirements can be met at a very low cost.

[0090] It should be noted that the above-mentioned node controller can not only realize voltage management and power flow regulation, but also can be designed and added with functions that can be realized by traditional power electronic equipment as needed, such as harmonic management, frequency regulation, etc.

[0091] In some embodiments, the present application also provides a mini distribution network architecture layout device 500 for a power distribution system, such as Fig.11 As shown, the mini distribution network architecture layout device 500 may specifically include the following modules:

[0092] The acquisition module 510 is used to acquire the distribution lines in the power distribution system to be laid out, where the distribution lines include a plurality of distribution branches and are extended to connect to a plurality of nodes and a plurality of users via a substation and a transformer.

[0093] The analysis module 520 is used to analyze the layout directions of multiple distribution branches to determine multiple bifurcation nodes from multiple nodes of the distribution line.

[0094] The division module 530 is used to divide the multiple bifurcation nodes along the distribution line into different levels with the transformer as the starting point, so as to obtain multiple target nodes corresponding to different levels.

[0095] The setting module 540 is used to set a node controller in the distribution line based on the locations of multiple target nodes, so as to arrange the distribution system into an architecture in which multiple mini distribution networks are connected.

[0096] According to an embodiment of the present application, any multiple modules among the acquisition module 510, the analysis module 520, the division module 530 and the setting module 540 can be combined into one module for implementation, or any one of the modules can be split into multiple modules. Alternatively, at least part of the functions of one or more of these modules can be combined with at least part of the functions of other modules and implemented in one module.

[0097] In some embodiments, the partitioning module 530 may be specifically used to:

[0098] Taking the transformer as the starting point, determine the bifurcation node closest to the transformer as the first-level target node;

[0099] Determine the bifurcation node closest to the user in the distribution system area as the final target node;

[0100] Based on the first-level target node and the final-level target node, determining the remaining target nodes from the plurality of forked nodes;

[0101] Starting from the first-level target node, the remaining target nodes are divided into levels in turn to obtain intermediate-level target nodes.

[0102] In some embodiments, the setting module 540 may be specifically used to:

[0103] Taking the final target node as the starting point, a group of upstream branches corresponding to the final target node, the intermediate target node and the first target node are determined in sequence as the target branches;

[0104] A node controller is selectively set on the target branch to arrange the distribution line into a structure in which multiple mini distribution networks are connected.

[0105] Fig.11 Each module in the device shown has the function of implementing each step in the aforementioned mini distribution network architecture layout method for the distribution system, and can achieve its corresponding technical effect. For the sake of concise description, it will not be repeated here.

[0106] In some embodiments, the present application provides an electronic device, the structure diagram of the electronic device is as follows Fig.12 shown.

[0107] The electronic device may include a processor 610 and a memory 620 storing computer program instructions.

[0108] Specifically, the processor 610 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0109] The memory 620 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 620 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In appropriate cases, the memory 620 may include a removable or non-removable (or fixed) medium. In appropriate cases, the memory 620 may be inside or outside the integrated gateway disaster recovery device. In a specific embodiment, the memory 620 is a non-volatile solid-state memory.

[0110] The memory 620 may include a read-only memory (ROM), a random access memory (RAM), a disk storage medium device, an optical storage medium device, a flash memory device, an electrical, optical or other physical / tangible memory storage device. Therefore, generally, the memory 620 includes one or more tangible (non-transitory) computer-readable storage media (e.g., a memory device) encoded with software including computer executable instructions, and when the software is executed (e.g., by one or more processors), it can perform the operations described in any of the above-mentioned embodiments of the mini distribution network architecture layout method for the distribution system.

[0111] The processor 610 implements any one of the mini distribution network architecture layout methods for a power distribution system in the above embodiments by reading and executing computer program instructions stored in the memory 620 .

[0112] In one example, the electronic device may further include a communication interface 630 and a bus 600. Fig.12 As shown, the processor 610, the memory 620, and the communication interface 630 are connected via a bus 600 and communicate with each other.

[0113] The communication interface 630 is mainly used to implement communication between various modules, devices, units and / or equipment in the embodiments of the present application.

[0114] Bus 600 includes hardware, software or both, and the parts of online data flow billing equipment are coupled to each other. For example, but not limitation, bus may include accelerated graphics port (AGP) or other graphics bus, enhanced industrial standard architecture (EISA) bus, front-end bus (FSB), hypertransport (HT) interconnection, industrial standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 600 may include one or more buses. Although the present application embodiment describes and shows a specific bus, the present application considers any suitable bus or interconnection.

[0115] In addition, in combination with the mini distribution network architecture layout method for the power distribution system in the above embodiments, the embodiments of the present application can provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when the computer program instructions are executed by the processor, any of the mini distribution network architecture layout methods for the power distribution system in the above embodiments is implemented.

[0116] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0117] The functional blocks shown in the above block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0118] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0119] Aspects of the present disclosure are described above with reference to the flowchart and / or block diagram of the method, device (system) and computer program product according to the embodiment of the present disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each box in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0120] In summary, compared with the prior art, this application has the following beneficial effects:

[0121] 1. This application analyzes the layout of multiple distribution branches in the distribution line to gain an in-depth understanding of the actual characteristics of the distribution system to be laid out, determines the bifurcation nodes existing in the distribution line and divides the multiple bifurcation nodes into levels, and achieves targeted management of each node and each user by controlling the bifurcation nodes. The voltage regulation capability of the node controller is used to split the distribution system into multiple smaller mini distribution networks connected to each other.

[0122] 2. This application explores how to access the node controller to achieve optimal management of the internal voltage of the distribution network substation from the perspective of determining the bifurcation node. Through the access of the node controller, the distribution network substation is further split into smaller substations, and the voltage management effect achieved by traditional methods such as substation splitting and new substation construction is achieved at a very low cost; in response to the problem that the voltage fluctuates greatly and changes rapidly over time after distributed new energy, charging piles, energy storage and other equipment rush into the substation, this solution can solve it through real-time dynamic management of the substation voltage.

[0123] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for laying out a mini distribution network architecture for a power distribution system, characterized in that: include: Obtain a distribution line in a power distribution system to be laid out, wherein the distribution line includes a plurality of distribution branches and is extended to connect to a plurality of nodes and a plurality of users via a substation and a transformer; Analyzing the layout directions of the plurality of power distribution branches to determine a plurality of bifurcation nodes from a plurality of nodes of the power distribution line; Taking the transformer as a starting point, dividing the plurality of bifurcated nodes along the distribution line into different levels to obtain a plurality of target nodes corresponding to different levels; Based on the locations of the plurality of target nodes, a node controller is provided in the power distribution line to arrange the power distribution system into a structure in which a plurality of mini distribution networks are connected; The bifurcation node corresponds to a group of upstream branches and more than two groups of downstream branches; The step of taking the transformer as the starting point and dividing the plurality of bifurcated nodes along the distribution line into different levels to obtain a plurality of target nodes corresponding to different levels includes: Taking the transformer as the starting point, determining the bifurcation node closest to the transformer as the primary target node; Determine the bifurcation node closest to the user in the distribution system area as the final target node; Based on the first-level target node and the final-level target node, determining the remaining target nodes from the plurality of forked nodes; Taking the first-level target node as the starting point, the remaining target nodes are divided into levels in turn to obtain intermediate-level target nodes; The step of setting a node controller in the power distribution line based on the positions of the plurality of target nodes so as to arrange the power distribution line into a structure in which a plurality of mini distribution networks are connected comprises: Taking the final target node as a starting point, sequentially determining the group of upstream branches corresponding to the final target node, the intermediate target node and the first target node as target branches; A node controller is selectively provided on the target branch to arrange the power distribution line into a structure in which a plurality of mini distribution networks are connected; In the case that the group of upstream branches corresponding to the final target node and the intermediate target node include multiple distribution branches, a distribution branch farthest from itself is determined as the target branch.

2. The method for laying out a mini distribution network architecture for a power distribution system according to claim 1, characterized in that: The group of upstream branches and the two or more groups of downstream branches are both located between two adjacent bifurcation nodes; The group of upstream branches includes one distribution branch or multiple distribution branches, and each group of downstream branches includes one distribution branch or multiple distribution branches.

3. The method for laying out a mini distribution network architecture for a power distribution system according to claim 2, characterized in that: The end of the distribution branch is one of the transformer, the user and the node; when the group of upstream branches includes multiple distribution branches, the multiple distribution branches are connected in series; when each group of downstream branches includes multiple distribution branches, the multiple distribution branches are connected in series.

4. The method for laying out a mini distribution network architecture for a power distribution system according to any one of claims 1 to 3, characterized in that: Also includes: The node controller is selectively arranged at the outlet side of the transformer and at the inlet side of a single user among the multiple users.

5. A mini distribution network architecture layout device for a power distribution system, characterized in that: include: An acquisition module, used for acquiring a distribution line in a distribution system to be laid out, wherein the distribution line includes a plurality of distribution branches and is extended to connect to a plurality of nodes and a plurality of users via a substation and a transformer; An analysis module, used for analyzing the layout directions of the plurality of power distribution branches, so as to determine a plurality of bifurcation nodes from a plurality of nodes of the power distribution line; A division module, used to divide the plurality of bifurcated nodes along the distribution line into different levels with the transformer as the starting point, so as to obtain a plurality of target nodes corresponding to different levels; A setting module, configured to set a node controller in the power distribution line based on the locations of the plurality of target nodes, so as to arrange the power distribution system into a structure in which a plurality of mini distribution networks are connected; The bifurcation node corresponds to a group of upstream branches and more than two groups of downstream branches; The step of taking the transformer as the starting point and dividing the plurality of bifurcated nodes along the distribution line into different levels to obtain a plurality of target nodes corresponding to different levels includes: Taking the transformer as the starting point, determining the bifurcation node closest to the transformer as the primary target node; Determine the bifurcation node closest to the user in the distribution system area as the final target node; Based on the first-level target node and the final-level target node, determining the remaining target nodes from the plurality of forked nodes; Taking the first-level target node as the starting point, the remaining target nodes are divided into levels in turn to obtain intermediate-level target nodes; The step of setting a node controller in the power distribution line based on the positions of the plurality of target nodes so as to arrange the power distribution line into a structure in which a plurality of mini distribution networks are connected comprises: Taking the final target node as a starting point, sequentially determining the group of upstream branches corresponding to the final target node, the intermediate target node and the first target node as target branches; A node controller is selectively provided on the target branch to arrange the power distribution line into a structure in which a plurality of mini distribution networks are connected; In the case that the group of upstream branches corresponding to the final target node and the intermediate target node include multiple distribution branches, a distribution branch farthest from itself is determined as the target branch.

6. An electronic device, characterized in that: include: A processor, a memory, and a program stored in the memory and executable on the processor, wherein when the program is executed by the processor, the method for laying out a mini distribution network architecture for a power distribution system as described in any one of claims 1 to 4 is implemented.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the mini distribution network architecture layout method for the distribution system as described in any one of claims 1 to 4 is implemented.

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