Distribution system area coordinated control method and device based on mini distribution network

Abstract

The present application provides a method and device for coordinated control of distribution system substations based on a mini distribution network, which relates to the field of power systems. The method includes: obtaining layout information of multiple mini distribution networks and collecting first substation status information; analyzing the first substation status information and generating control instructions through a coordinated control center; and sending control instructions to a node controller corresponding to a target distribution network based on a position mapping relationship. The present application collects and analyzes the first substation status information of multiple mini distribution networks in real time. Based on the first substation status information, the target distribution network that needs to be adjusted can be determined from the multiple mini distribution networks. According to the position mapping relationship between the multiple node controllers and the multiple mini distribution networks, the control instructions are sent to the node controller corresponding to the target distribution network, and the multiple mini distribution networks are coordinated in real time to dynamically adjust the voltage distribution and power distribution of the substation.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and in particular to a method and device for coordinated control of distribution system substations based on a mini distribution network. Background Art

[0002] With the continuous development of power electronics technology, the cost and size of power electronics-based voltage management equipment have continued to decline, making it widely available across power distribution networks. Based on this, the concept of mini-distribution networks, through the integration of power electronics equipment, further divides distribution system substations into smaller substations. This achieves the same management effects achieved by traditional methods such as substation splitting and new substation construction at a minimal cost, thereby achieving overall optimized management of distribution network substations. With the continuous influx of distributed renewable energy, charging stations, and energy storage devices, distribution system substations inevitably require real-time dynamic voltage management, which cannot be achieved using traditional methods.

[0003] After the distribution system substations are connected to power electronic voltage management equipment such as node controllers to layout the mini distribution network, it is still necessary to explore how to coordinate the control of each node controller to optimize the substation voltage distribution and power distribution in real time, so as to achieve the effects of reducing substation management costs, improving substation photovoltaic access capabilities, and increasing the operating power of substation charging piles. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a method and device for coordinated control of distribution system substations based on a mini distribution network, which solves the problem that it is difficult for individual node controllers to achieve real-time optimized management of substations through coordinated control.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] In the first aspect, an embodiment of the present application provides a distribution system substation collaborative control method based on a mini distribution network, and the distribution system substation collaborative control method includes: obtaining layout information of multiple mini distribution networks in the distribution system, the layout information including a position mapping relationship between multiple node controllers and multiple mini distribution networks; collecting the first substation status information of multiple mini distribution networks in the first phase, and sending the first substation status information to a preset collaborative control center; analyzing the first substation status information through a logic judgment program preset by the collaborative control center to determine a target node to be adjusted from multiple nodes of the distribution system; determining the mini distribution network to which the target node belongs as the target distribution network, and generating corresponding control instructions through the collaborative control center; based on the position mapping relationship, sending control instructions to the node controller corresponding to the target distribution network to collaboratively control multiple mini distribution networks in the distribution system.

[0007] According to the first aspect of the embodiment of the present application, the node controller access location is adjacent to the intermediate node of the distribution system substation, the entry node of the photovoltaic access area, the entry node of the charging pile access area, the entry node of the energy storage access area, the entry node of the low-voltage user area, and at least one of the outlet side of the substation transformer.

[0008] According to the first aspect of the embodiment of the present application, before determining that the mini distribution network to which the target node belongs is the target distribution network and generating corresponding control instructions through the collaborative control center, the method for collaborative control of distribution system substations based on the mini distribution network further includes: collecting second substation status information of multiple mini distribution networks before the first stage;

[0009] By analyzing the state information of the second substation, a first power consumption behavior law of the distribution system substation is determined, so as to guide the regulation of multiple mini distribution networks through the first power consumption behavior law.

[0010] According to the first aspect of the embodiment of the present application, before the aforementioned determination that the mini distribution network to which the target node belongs is the target distribution network and the corresponding control instructions are generated through the collaborative control center, the distribution system substation collaborative control method based on the mini distribution network also includes: performing a comprehensive analysis of the first substation status information and the second substation status information, determining the second power consumption behavior law of the distribution system substation, and guiding the regulation of the mini distribution network through the second power consumption behavior law.

[0011] According to the first aspect of the embodiment of the present application, the power distribution system is arranged in a multi-level manner and includes multiple groups of control branches. Multiple node controllers are provided in the multiple groups of control branches. One group of control branches corresponds to at least one node controller. The multiple node controllers work together to ensure that the power consumption information of each user in the mini distribution network is within a preset range.

[0012] According to the first aspect of the embodiment of the present application, the first substation status information and the second substation status information are collected through the target device, and the target device includes the original metering equipment and node controller of the distribution system substation. The metering equipment, node controller and collaborative control center are interconnected through a preset communication method.

[0013] According to a first aspect of an embodiment of the present application, the preset communication method is one of power carrier communication and 4G module communication, and the control instruction includes at least one of a voltage adjustment instruction, a power adjustment instruction, and a control mode switching instruction.

[0014] In the second aspect, an embodiment of the present application provides a distribution system substation collaborative control device based on a mini distribution network, and the distribution system substation collaborative control device includes: an acquisition module, a collection module, an analysis module, a determination module and a sending module; the acquisition module is used to acquire the layout information of multiple mini distribution networks in the distribution system, and the layout information includes a position mapping relationship between multiple node controllers and multiple mini distribution networks; the acquisition module is used to collect the first substation status information of multiple mini distribution networks in the first stage, and send the first substation status information to a preset collaborative control center; the analysis module is used to analyze the first substation status information through a logic judgment program preset by the collaborative control center to determine the target node to be adjusted from multiple nodes of the distribution system; the determination module is used to determine that the mini distribution network to which the target node belongs is the target distribution network, and generate corresponding control instructions through the collaborative control center; the sending module is used to send control instructions to the node controller corresponding to the target distribution network based on the position mapping relationship to collaboratively control multiple mini distribution networks in the distribution system.

[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 coordinated control of distribution system substations based on a mini-distribution network in the first aspect mentioned 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 method for coordinated control of distribution system substations based on a mini distribution network in the first aspect is implemented.

[0017] The present invention provides a method and device for coordinated control of distribution system substations based on a mini distribution network. Compared with the existing technology, it has the following advantages:

[0018] The present application collects the first substation status information of multiple mini distribution networks in real time, analyzes the first substation status information through the logic judgment program of the collaborative control center, and when there is an abnormality in the first substation status information, it can index and determine the target node from multiple nodes based on the first substation status information, and determine the target distribution network that needs to be adjusted from multiple mini distribution networks. According to the position mapping relationship between multiple node controllers and multiple mini distribution networks, the control instruction is sent to the node controller corresponding to the target distribution network, and the multiple mini distribution networks are collaboratively controlled in real time to dynamically adjust the substation voltage distribution and power distribution. 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0020] Figure 1 This is a flow chart of a method for coordinated control of distribution system substations based on a mini distribution network provided in an embodiment of the present application;

[0021] Figure 2 This is an exemplary diagram of coordinated control of node controllers in a power distribution system provided by an embodiment of the present application;

[0022] Figure 3 This is a typical voltage change diagram of some paths in the distribution system substation provided by the embodiment of the present application;

[0023] Figure 4 yes Figure 3 Schematic diagram of the coordinated changes of the middle part of the path after the voltage of control node 1 is raised;

[0024] Figure 5 yes Figure 4 Schematic diagram of the coordinated change of the medium voltage change trend after adjustment by device 3;

[0025] Figure 6 yes Figure 3 Schematic diagram of typical voltage changes in the middle path after power backflow occurs when connected to photovoltaic power generation;

[0026] Figure 7 yes Figure 6 A schematic diagram of a typical voltage change trend in the voltage change after adjustment by device 3;

[0027] Figure 8 This is a structural diagram of a distribution system substation collaborative control device based on a mini distribution network provided in an embodiment of the present application;

[0028] Figure 9 This is a structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0031] The embodiments of the present application provide a method and device for coordinated control of distribution system substations based on a mini distribution network, thereby solving the problem that it is difficult for individual node controllers to perform coordinated control to optimize substation management in real time.

[0032] The technical solution in the embodiments of the present application is to solve the above technical problems, and the overall idea is as follows:

[0033] With social development, electricity demand continues to rise. In some remote urban and rural areas, mountainous rural areas, and other regions, the distribution network infrastructure is relatively weak, with insufficient funding and personnel invested in network construction. This has led to relatively slow construction and renovation, resulting in voltage levels at the user end being lower than the standard supply voltage, commonly referred to as low voltage. Low voltage significantly impacts the quality of electricity users, yet effective treatment has been difficult due to the following reasons: First, low voltage issues are numerous, widely distributed, and difficult to address, requiring significant investment to fully resolve. Second, low voltage is a dynamic issue, with a common pattern of rising and falling, resulting in limited overall effectiveness. Third, low voltage issues stem from diverse sources, ranging from equipment to management issues. Many low voltage issues are the result of multiple factors, making it difficult to prioritize key issues at the grassroots level. Fourth, impactful issues are prominent, with both low voltage during peak loads and high voltage during off-peak loads coexisting.

[0034] A large number of distributed photovoltaic systems are being directly integrated into distribution network substations. The rapid growth of photovoltaic installations has led to grid connection difficulties and insufficient absorption, which have begun to surface, forcing some areas to halt distributed photovoltaic grid connection. However, according to analysis and research, a large proportion of these suspensions are not due to insufficient capacity in the substations, but rather to power backflow caused by photovoltaic integration, resulting in high voltage issues at certain nodes in the substations. Therefore, simply because the voltage at one or a few nodes is too high, the entire substation's distributed photovoltaic system is shut down, resulting in extremely insufficient capacity utilization. Traditional distribution network substation voltage management methods suffer from limited regulation capabilities, high costs, and low efficiency. Furthermore, with the continuous influx of distributed renewable energy, charging stations, and energy storage devices, distribution network substations inevitably require real-time dynamic voltage management, which cannot be achieved with traditional methods.

[0035] Existing management solutions based on power electronic equipment mostly adopt the "one device per substation" approach, but do not explore how to connect power electronic equipment or other equipment with similar functions from the perspective of each node and user within the substation to achieve optimal management of the voltage within the distribution network substation.

[0036] With the continuous development of power electronics technology, the cost and volume of voltage management equipment based on power electronics are constantly decreasing, making it possible to achieve widespread use in substations. Based on this, the idea of ​​a mini distribution network is proposed. Through the access of power electronics equipment, the distribution network substations are further divided into smaller substations, and the management effects achieved by traditional methods such as substation splitting and new substation construction are achieved at a very low cost, thereby realizing the overall optimization and management of the distribution network substations.

[0037] After the distribution system substations are connected to power electronic voltage management equipment such as node controllers to layout the mini distribution network, it is still necessary to explore how to coordinate the control of each node controller to optimize the substation voltage distribution and power distribution in real time, so as to achieve the effects of reducing substation management costs, improving substation photovoltaic access capabilities, and increasing the operating power of substation charging piles.

[0038] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0039] The following first introduces a distribution system substation collaborative control method based on a mini distribution network provided in an embodiment of the present application.

[0040] The present application provides a flow chart of a method for coordinated control of distribution system substations based on a mini distribution network, as shown in FIG. Figure 1 As shown, the distribution system substation coordinated control method may include the following steps S110-S150.

[0041] S110: Obtain layout information of multiple mini distribution networks in the power distribution system, where the layout information includes a location mapping relationship between multiple node controllers and multiple mini distribution networks.

[0042] S120: Collect first substation status information of multiple mini distribution networks in the first phase, and send the first substation status information to a preset collaborative control center.

[0043] S130. Analyze the first substation status information through a logic judgment program preset by the collaborative control center to determine a target node to be adjusted from multiple nodes in the power distribution system.

[0044] S140: Determine the mini distribution network to which the target node belongs as the target distribution network, and generate corresponding control instructions through the collaborative control center.

[0045] S150 : Based on the location mapping relationship, send a control instruction to a node controller corresponding to the target distribution network to coordinately control multiple mini distribution networks in the distribution system.

[0046] In the embodiment of the present application, the layout information of different distribution systems is different. The present application can be applied to different distribution systems based on mini distribution networks. In the process of collecting the first substation status information to analyze and determine the node controller that needs to be adjusted, it is necessary to determine the position mapping relationship between multiple node controllers and multiple mini distribution networks; it can be understood that the present application analyzes the first substation status information through the logic judgment program of the collaborative control center. When there is an abnormality in the first substation status information, the target distribution network that needs to be adjusted can be determined from multiple mini distribution networks based on the first substation status information. According to the position mapping relationship between the multiple node controllers and the multiple mini distribution networks, the control instruction is sent to the node controller corresponding to the target distribution network, and the multiple mini distribution networks are collaboratively controlled in real time.

[0047] In one example, the node controller access location is adjacent to at least one of an intermediate node in the distribution system substation, an entry node in the photovoltaic access area, an entry node in the charging pile access area, an entry node in the energy storage access area, an entry node in the low-voltage user area, and the outlet side of the substation transformer. It will be appreciated that the node controller access location can be set based on the actual layout requirements of the mini-distribution network.

[0048] In some embodiments, before determining that the mini distribution network to which the target node belongs is the target distribution network and generating corresponding control instructions through the collaborative control center, the distribution system area collaborative control method based on the mini distribution network further includes:

[0049] S210, collecting status information of the second substation of multiple mini distribution networks before the first stage;

[0050] S220: Determine a first power consumption behavior rule of the distribution system substation by analyzing the second substation status information, so as to guide the regulation of the plurality of mini distribution networks through the first power consumption behavior rule.

[0051] In the embodiment of the present application, it can be understood that in the process of generating control instructions through the logical judgment program preset by the collaborative control center to coordinate the control of multiple mini distribution networks, it is also possible to analyze the corresponding first power consumption behavior rules based on the second substation status information previously collected to guide the corresponding regulation work.

[0052] In some embodiments, before determining that the mini distribution network to which the target node belongs is the target distribution network and generating corresponding control instructions through the collaborative control center, the distribution system area collaborative control method based on the mini distribution network further includes:

[0053] S310: Comprehensively analyze the first substation status information and the second substation status information to determine a second power consumption behavior pattern of the distribution system substation, so as to guide the regulation of the mini distribution network through the second power consumption behavior pattern.

[0054] In the embodiment of the present application, it can be understood that in the process of collaboratively controlling multiple mini distribution networks by generating control instructions through a logic judgment program preset by a collaborative control center, since the status information of the first substation in the first stage is in a real-time update state, the first substation status information and the second substation status information can be combined to refresh the database, and the second power consumption behavior pattern of the substation can be analyzed in real time to guide the current regulation work.

[0055] In one example, the power distribution system is arranged in multiple levels and includes multiple groups of control branches. Multiple node controllers are set in the multiple groups of control branches. One group of control branches corresponds to at least one node controller. The multiple node controllers work together to ensure that the power consumption information of each user in the mini distribution network is within a preset range.

[0056] In one example, the status information of the first substation and the status information of the second substation are collected through the target device, which includes the original metering equipment and node controller of the distribution system substation. The metering equipment, node controller and collaborative control center are interconnected through a preset communication method.

[0057] In one example, the preset communication method is one of power carrier communication and 4G module communication, and the control instructions include at least one of voltage adjustment instructions, power adjustment instructions, and control mode switching instructions. It is understandable that the collaborative control center sends voltage, power, control mode and other instructions to the node controller device based on the actual electricity usage behavior of users in the substation area, in conjunction with the node controller itself and the substation's original metering equipment to monitor the real-time status information of the substation area, to achieve coordinated control of the substation area on each node controller, thereby achieving optimized management of the substation area.

[0058] This application provides a specific implementation example of the aforementioned distribution system area coordinated control method based on the mini distribution network, please refer to Figure 2 When household photovoltaics connected during the day start to generate electricity, power backflow may occur, resulting in increased voltage for users in the substation area. When the collaborative control center detects that the voltage of users in the photovoltaic access area has risen and there is a risk of voltage exceeding the limit, it sends a voltage reduction adjustment instruction to the node controller near the entrance node of the photovoltaic access area to alleviate the high voltage problem of users caused by photovoltaic access and increase the upper limit of photovoltaic power generation. At night, when household photovoltaics are not generating electricity, for users with low voltage, a voltage increase adjustment instruction is sent to the node controller to solve the low voltage problem of users.

[0059] It's important to note that regulating all user voltages to a constant standard 220V is impractical. This would require installing a node controller in every household, which would be extremely costly. Therefore, the goal of coordinated control is to keep the voltage at each user and node within a normal range, preventing voltage violations and ensuring normal electricity supply for residents. The normal voltage range specified by the power grid is typically 198V-235.4V.

[0060] by Figure 2 For example, first consider the situation where photovoltaic power is not connected or household photovoltaic power does not generate electricity at night. Due to the long transmission line between the transformer in the substation and some users, there may be a low voltage problem for users. At the same time, when users use high-power charging pile equipment, the low voltage problem will be aggravated. Figure 2 Users 6, 7, 9, and 10 are far away from the transformer and are at greater risk of low voltage.

[0061] It should be noted that devices 1-4 are all node controllers. Devices 1-4 can perform voltage regulation to varying degrees to keep the voltage at each user at a normal level. The specific regulation strategy of the node controller is analyzed as follows:

[0062] Since the voltage at the outlet of the substation is basically stabilized within the normal range by the large power grid, the voltage at node 1 is usually normal. Taking the top path as an example, according to the normal power flow direction, 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. The typical voltage changes of this path are as follows: Figure 3 As shown:

[0063] Figure 3 The middle horizontal axis represents the length of the distribution line between nodes. The longer the line, the greater the voltage drop. The slope of the voltage drop between nodes 1 and 2 is greater than the slope of the voltage drop between nodes 2 and 6. This is primarily because the power transmitted between nodes 1 and 2 is equal to the power transmitted between nodes 2 and 6 plus the power transmitted between nodes 2 and 3. Therefore, the power transmitted between nodes 1 and 2 is greater, and the voltage drops faster.

[0064] from Figure 3 It can be seen that the voltages of node 10, node 11, and user 10 are lower than the lower limit of the normal range of 198V, and voltage control is required.

[0065] Please refer to Figure 2 Considering that node controllers are installed between the transformer and node 1, and between node 6 and node 10, we first use device 1 between the transformer and node 1 to adjust the voltage. Since device 1 is installed on the outlet side of the transformer in the substation, it can raise the voltage of the entire substation. Here, the voltage of node 1 can be raised to 235V to improve the low voltage situation of the entire substation. The voltage change of the above path is as follows: Figure 4 As shown in the figure, after the boost regulation by device 1, the voltage of each node is increased by about 5V.

[0066] It should be noted that the reason why device 1 is used here for voltage step-up regulation instead of using the substation transformer for gear adjustment is that usually the substation transformer will increase the voltage by about 10V when it is adjusted by one gear. If the gear is adjusted, the voltage of node 1 will rise to 240V, which exceeds the normal voltage range and cannot be used. At this time, the voltage of node 10, node 11, and user 10 is still lower than the lower limit of the normal range of 198V, and device 3 is required for further voltage adjustment. Device 3 can raise the voltage of node 10, and then raise the voltage of node 11 and user 10; after raising the voltage of node 10, the voltage change of the above path is as follows Figure 5 As shown:

[0067] The voltage can be directly raised at the access location of device 3. Here, the voltage at device 3 is raised to 230V, and then the voltage at node 10 is raised to 224V, the voltage at node 11 is raised to 220V, and the voltage at user 10 is raised to 218V, thereby achieving low voltage management for node 10, node 11, and user 10.

[0068] exist Figure 2 When users 8-10 are connected to photovoltaic power generation, when photovoltaic power generation occurs, the collaborative control center can determine whether the voltage in the area has increased, and the extent of the increase, based on the real-time voltage information from device 3 and the meters of users 8-10. The collaborative control center sends a matching voltage reduction control instruction to device 3 through analysis to maintain the user voltage at a normal level. When the photovoltaic power access is too high, the voltage of other users in the substation will also increase to a certain extent, that is, users 1-7 will also have the risk of excessive voltage exceeding the limit. At this time, devices 1, 2, and 4 can perform voltage reduction adjustments to varying degrees to keep the voltage of all users in the distribution network substation as normal as possible. The specific adjustment strategy of the node controller is analyzed as follows:

[0069] 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 becomes: node 11 → node 10 → node 6 → node 2 → node 1, and the voltage of node 11 > node 10 > node 6 > node 2 > node 1. The specific typical voltage changes of this path are as follows: Figure 6 As shown:

[0070] like Figure 6 As shown in the figure, since the voltage at 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, but the node voltage continues to rise thereafter, and the voltage at user 10 reaches 243V, which is higher than the upper limit of the normal range of 235.4V, and voltage management is required. Here, device 1 between the transformer and node 1 is not used to further reduce the voltage of the substation, because adjusting the voltage at node 1 too low will also lower the voltage at node 2, exposing users 1-4 to a greater risk of low voltage. Therefore, only device 3 between node 6 and node 10 is used for voltage reduction regulation. Device 3 can reduce the voltage at node 10, and then reduce the voltage at subsequent nodes 11 and user 10. After the voltage at node 10 is reduced, the voltage changes in the above path are as follows: Figure 7 As shown: The voltage can be directly reduced at the access location of device 3. Here, the voltage at device 3 is reduced to 209V, and the voltage of node 10 is subsequently reduced to 216V, the voltage of node 11 is reduced to 223V, and the voltage of user 10 is reduced to 231V, thereby achieving high voltage management for node 10, node 11 and user 10.

[0071] It should be noted that, from the above-mentioned process of managing the high voltage problem caused by photovoltaic power generation, it can be seen that the advantage of using a multi-node controller to split the distribution network into mini distribution networks over the traditional method is that the traditional method only adjusts the voltage of the entire distribution network uniformly through the voltage regulation of the distribution network transformer, and the voltage distribution of the distribution network itself is uneven. When the voltage of a certain user or node is too high or too low, in order to adjust it to the normal range, all other nodes and users will be affected. This impact is very likely to cause the voltage of these nodes and users to exceed the limit, so the regulation ability of the traditional method is very limited. In addition, with the access of household photovoltaics, charging piles, etc., the uneven flow of power is aggravated, which in turn aggravates the uneven voltage distribution within the distribution network, further compressing the regulation ability of the traditional method; and the present application solution can regulate the voltage of each mini distribution network separately, that is, the uneven distribution of voltage can be limited to each mini distribution network, and the overall voltage of each mini distribution network can be adjusted to the normal range.

[0072] The benefit of adjusting the voltage distribution in the distribution network area to be more uniform is that it can greatly increase the access capacity of photovoltaic power generation, charging piles, etc. in the area, because their access capacity will be significantly reduced due to voltage over-limit. For example Figure 2 After users 8-10 connect to the photovoltaic system at 20kW, the voltage of these three users will be high, and the photovoltaic system will not be able to increase its access capacity. If the power carrying capacity of the transmission line is 30kW, the photovoltaic access capacity can be increased to 30kW after solving the voltage limit problem through coordinated control. Similarly, the problem of limited access capacity of high-power equipment such as charging piles due to low voltage problems can also be improved through this application solution.

[0073] In some embodiments, the present application further provides a distribution system area collaborative control device 400 based on a mini distribution network, such as Figure 8 As shown, the distribution system substation coordinated control device 400 may specifically include the following modules:

[0074] The acquisition module 410 is configured to acquire layout information of multiple mini distribution networks in the power distribution system, where the layout information includes a location mapping relationship between multiple node controllers and multiple mini distribution networks.

[0075] The collection module 420 is used to collect the first substation status information of multiple mini distribution networks in the first phase, and send the first substation status information to a preset collaborative control center.

[0076] The analysis module 430 is used to analyze the first substation status information through a logic judgment program preset by the collaborative control center to determine a target node to be adjusted from multiple nodes in the power distribution system.

[0077] The determination module 440 is configured to determine the mini distribution network to which the target node belongs as the target distribution network, and generate corresponding control instructions through the collaborative control center.

[0078] The sending module 450 is configured to send a control instruction to a node controller corresponding to a target distribution network based on the location mapping relationship, so as to coordinately control multiple mini distribution networks in the distribution system.

[0079] According to an embodiment of the present application, any multiple modules among the acquisition module 410, the collection module 420, the analysis module 430, the determination module 440, and the sending module 450 may be combined into a single module, or any one of these modules may be split into multiple modules. Alternatively, at least part of the functionality of one or more of these modules may be combined with at least part of the functionality of other modules and implemented in a single module.

[0080] In some embodiments, the distribution system substation coordinated control device 400 may further include a first guidance module 460. The first guidance module 460 may be specifically configured to:

[0081] Collect status information of the second substation of multiple mini distribution networks before the first stage;

[0082] By analyzing the state information of the second substation, a first power consumption behavior law of the distribution system substation is determined, so as to guide the regulation of multiple mini distribution networks through the first power consumption behavior law.

[0083] In some embodiments, the distribution system substation coordinated control device 400 may further include a second guidance module 470. The second guidance module 470 may be specifically used to:

[0084] A comprehensive analysis is performed on the status information of the first substation and the status information of the second substation to determine the second power consumption behavior law of the distribution system substation, so as to guide the regulation of the mini distribution network through the second power consumption behavior law.

[0085] Figure 8 Each module in the device shown has the function of implementing each step in the aforementioned method for coordinated control of distribution system substations based on a mini distribution network, and can achieve its corresponding technical effects. For the sake of brevity, they will not be repeated here.

[0086] In some embodiments, the present application provides an electronic device, the structural diagram of the electronic device is as follows Figure 9 shown.

[0087] The electronic device may include a processor 510 and a memory 520 storing computer program instructions.

[0088] Specifically, the processor 510 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.

[0089] The memory 520 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 520 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. Where appropriate, the memory 520 may include removable or non-removable (or fixed) media. Where appropriate, the memory 520 may be inside or outside the integrated gateway disaster recovery device. In a specific embodiment, the memory 520 is a non-volatile solid-state memory.

[0090] The memory 520 may include a read-only memory (ROM), a random access memory (RAM), a magnetic 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 520 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 method for coordinated control of distribution system substations based on a mini distribution network.

[0091] The processor 510 reads and executes computer program instructions stored in the memory 520 to implement any one of the methods for coordinated control of distribution system substations based on a mini distribution network in the above embodiments.

[0092] In one example, the electronic device may further include a communication interface 530 and a bus 500. Figure 9 As shown, the processor 510 , the memory 520 , and the communication interface 530 are connected via a bus 500 and communicate with each other.

[0093] The communication interface 530 is mainly used to implement communication between various modules, devices, units and / or equipment in the embodiments of the present application.

[0094] Bus 500 includes hardware, software or both, and the parts of online data flow metering equipment are coupled to each other. For example, but not limitation, bus can include accelerated graphics port (AGP) or other graphics bus, enhanced industry standard architecture (EISA) bus, front side bus (FSB), hypertransport (HT) interconnection, industry 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 500 can include one or more buses. Although the present application embodiment describes and shows specific bus, the application considers any suitable bus or interconnection.

[0095] In addition, in conjunction with the above-mentioned method for coordinated control of distribution system substations based on a mini distribution network, embodiments of the present application may provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when the computer program instructions are executed by a processor, any of the above-mentioned methods for coordinated control of distribution system substations based on a mini distribution network is implemented.

[0096] It should be understood that the present application is not limited to the specific configurations and processes described above and illustrated in the figures. For the sake of brevity, a detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and illustrated as examples. However, the method process of the present application is not limited to the specific steps described and illustrated. Those skilled in the art can make various changes, modifications, and additions, or change the order of the steps after understanding the spirit of the present application.

[0097] The functional blocks shown in the above block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of the present application are programs or code segments that are used to perform the required tasks. Programs or code segments can be stored in machine-readable media, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable media" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0098] 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. In other words, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0099] Aspects of the present disclosure have been described above with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments 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 is also understood that each box in the block diagram and / or flowchart and the combination of the boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0100] In summary, compared with the prior art, this application has the following beneficial effects:

[0101] 1. This application analyzes the collected first substation status information through the logical judgment program of the collaborative control center. When there is an abnormality in the first substation status information, the target distribution network that needs to be adjusted can be determined based on the first substation status information. According to the position mapping relationship between multiple node controllers and multiple mini distribution networks, the control instruction is sent to the node controller corresponding to the target distribution network to perform real-time collaborative control of multiple mini distribution networks.

[0102] 2. This application can effectively solve the problem of managing the voltage fluctuations and rapid changes over time after the influx of distributed new energy, charging piles, energy storage and other equipment into the substation by dynamically adjusting the voltage distribution and power distribution in the substation in real time, thereby achieving the effects of reducing the substation voltage management cost, improving the photovoltaic access capacity of the substation, and increasing the operating power of the charging piles in the substation.

[0103] 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 they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. 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 various embodiments of the present invention.

Claims

1. A method for coordinated control of distribution system substations based on a mini distribution network, characterized in that: include: Acquire layout information of a plurality of mini distribution networks in a power distribution system, the layout information including a location mapping relationship between a plurality of node controllers and a plurality of the mini distribution networks; Collecting state information of first substations of a plurality of the mini distribution networks in the first phase, and sending the state information of the first substations to a preset collaborative control center; Analyzing the first substation status information through a logic judgment program preset by the collaborative control center to determine a target node to be adjusted from multiple nodes of the power distribution system; Determine the mini distribution network to which the target node belongs as the target distribution network, and generate corresponding control instructions through the collaborative control center; Based on the position mapping relationship, the control instruction is sent to a node controller corresponding to the target distribution network to coordinately control multiple mini distribution networks in the distribution system; The node controller is a power electronic voltage management device, and the node controller access location is adjacent to at least one of the intermediate node of the distribution system area, the entry node of the photovoltaic access area, the entry node of the charging pile access area, the entry node of the energy storage access area, the entry node of the low-voltage user area, and the outlet side of the transformer of the area; the node controller is set between the nodes of the power flow path; When the collaborative control center detects that the voltage of users in the photovoltaic access area has risen and there is a risk of voltage exceeding the limit, it will send a voltage reduction adjustment instruction to the node controller near the entrance node of the photovoltaic access area to alleviate the high voltage problem of users caused by photovoltaic access and at the same time increase the upper limit of photovoltaic power generation; at night when household photovoltaics are not generating electricity, for users with low voltage, the collaborative control center will send a voltage increase adjustment instruction to the node controller to solve the low voltage problem of users.

2. The method for coordinated control of distribution system substations based on a mini distribution network according to claim 1, characterized in that: Before determining that the mini distribution network to which the target node belongs is the target distribution network and generating corresponding control instructions through the collaborative control center, the distribution system substation collaborative control method based on the mini distribution network further includes: Collecting state information of the second substations of the plurality of mini distribution networks before the first stage; By analyzing the second substation status information, a first power consumption behavior law of the distribution system substation is determined, so as to guide the regulation of the plurality of mini distribution networks through the first power consumption behavior law.

3. The method for coordinated control of distribution system substations based on a mini distribution network according to claim 2, characterized in that: Before determining that the mini distribution network to which the target node belongs is the target distribution network and generating corresponding control instructions through the collaborative control center, the distribution system substation collaborative control method based on the mini distribution network further includes: A comprehensive analysis is performed on the first substation status information and the second substation status information to determine a second power consumption behavior pattern of the distribution system substation, so as to guide the regulation of the mini distribution network through the second power consumption behavior pattern.

4. The method for coordinated control of distribution system substations based on a mini distribution network according to claim 1, characterized in that: The power distribution system is arranged in multiple levels and includes multiple groups of control branches. Multiple node controllers are provided in the multiple groups of control branches. One group of control branches corresponds to at least one node controller. The multiple node controllers work together to ensure that the power consumption information of each user in the mini distribution network is within a preset range.

5. The method for coordinated control of distribution system substations based on a mini distribution network according to claim 2, characterized in that: The first substation status information and the second substation status information are collected through target devices, and the target devices include the original metering equipment of the distribution system substation and the node controller. The metering equipment, the node controller and the collaborative control center are interconnected through a preset communication method.

6. The method for coordinated control of distribution system substations based on a mini distribution network according to claim 5, characterized in that: The preset communication method is one of power carrier communication and 4G module communication, and the control instruction includes at least one of a voltage adjustment instruction, a power adjustment instruction and a control mode switching instruction.

7. A distribution system area collaborative control device based on a mini distribution network, characterized in that: include: an acquisition module, configured to acquire layout information of a plurality of mini distribution networks in a power distribution system, wherein the layout information includes a location mapping relationship between a plurality of node controllers and a plurality of the mini distribution networks; a collection module, configured to collect state information of first substations of a plurality of the mini distribution networks in the first phase, and send the state information of the first substations to a preset collaborative control center; an analysis module, configured to analyze the first substation status information through a logic judgment program preset by the collaborative control center, so as to determine a target node to be adjusted from a plurality of nodes in the power distribution system; a determination module, configured to determine the mini distribution network to which the target node belongs as the target distribution network, and to generate corresponding control instructions through the collaborative control center; a sending module, configured to send the control instruction to a node controller corresponding to the target distribution network based on the position mapping relationship, so as to coordinately control multiple mini distribution networks in the distribution system; The node controller is a power electronic voltage management device, and the node controller access location is adjacent to at least one of the intermediate node of the distribution system area, the entry node of the photovoltaic access area, the entry node of the charging pile access area, the entry node of the energy storage access area, the entry node of the low-voltage user area, and the outlet side of the transformer of the area; the node controller is set between the nodes of the power flow path; When the collaborative control center detects that the voltage of users in the photovoltaic access area has risen and there is a risk of voltage exceeding the limit, it will send a voltage reduction adjustment instruction to the node controller near the entrance node of the photovoltaic access area to alleviate the high voltage problem of users caused by photovoltaic access and at the same time increase the upper limit of photovoltaic power generation; at night when household photovoltaics are not generating electricity, for users with low voltage, the collaborative control center will send a voltage increase adjustment instruction to the node controller to solve the low voltage problem of users.

8. 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 coordinated control of distribution system substations based on a mini distribution network according to any one of claims 1 to 6 is implemented.

9. 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 distribution system substation coordinated control method based on the mini distribution network as described in any one of claims 1 to 6 is implemented.

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