Method and device for determining access strategy of power distribution network and readable storage medium

Abstract

The invention discloses a method and device for determining an access strategy of a power distribution network and a readable storage medium. The method comprises the following steps: acquiring basic data of the power distribution network, the basic data being used for indicating data related to an access node in the power distribution network; based on the basic data, three-phase current unbalance data and line cost data of the power distribution network are determined, the three-phase current unbalance data are used for indicating the change degree of the three-phase current unbalance degree of the power distribution network in the time period before the access node is accessed and the time period after the access node is accessed, and the change degree of the three-phase current unbalance degree of the power distribution network is used for indicating the line cost data of the power distribution network. The line cost data is used for indicating the line operation cost of the power distribution network after the power distribution network accesses the access node; and determining a target access strategy of the power distribution network based on the three-phase current imbalance data and the line cost data. The technical problem that the access strategy of the power distribution network cannot be determined is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of access point selection for low voltage business expansion, and in particular to a method, device and readable storage medium for determining an access strategy for a distribution network. Background Art

[0002] At present, in the current power industry, customers' electricity demand is growing, and the requirements for service quality are also increasing. Business expansion registration, as the first step for power companies to establish power supply and use relationships with new and old customers, is not only related to the stable operation of the power system, but also directly affects customers' electricity experience and the market competitiveness of power companies. In the power industry, the selection of access points during low-voltage power grid expansion mainly refers to determining the specific location where the new load is connected to the existing low-voltage power grid. In the process of business expansion registration, the selection of access points is very critical. The ideal access point should first ensure the quality of power supply, that is, the selected access point can provide stable voltage and sufficient capacity to meet the customer's current and future electricity needs. Secondly, the economy should be considered, and the access solution close to the load center, with the shortest path and low construction cost should be selected to reduce transmission losses.

[0003] In related technologies, manual judgment of access points based on experience is often used in actual operations. The principle of proximity is adopted to directly find nearby access points, and one of the three phases is selected for access based on experience. However, the traditional method of manually judging access points based on experience is highly subjective, and does not consider the three-phase imbalance of the system after access, resulting in increased losses in distribution transformers and lines, affecting the overall power supply quality, and endangering the safety and life of the low-voltage distribution network. Therefore, there is a technical problem that the access strategy of the distribution network cannot be determined.

[0004] With respect to the above-mentioned technical problem of being unable to determine the access strategy of the distribution network, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present invention provide a method, an apparatus and a readable storage medium for determining an access strategy of a distribution network, so as to at least solve the technical problem that the access strategy of the distribution network cannot be determined.

[0006] According to one aspect of an embodiment of the present invention, a method for determining an access strategy of a distribution network is provided. The method may include: obtaining basic data of the distribution network, wherein the basic data is used to indicate data related to access nodes in the distribution network; based on the basic data, determining three-phase current imbalance data and line cost data of the distribution network, wherein the three-phase current imbalance data is used to indicate the degree of change of the three-phase current imbalance of the distribution network in the time period before the distribution network accesses the access node and the time period after the distribution network accesses the access node, and the line cost data is used to indicate the cost of line operation of the distribution network after the distribution network accesses the access node; based on the three-phase current imbalance data and the line cost data, determining the target access strategy of the distribution network.

[0007] Optionally, based on basic data, three-phase current imbalance data of the distribution network is determined, including: inputting the basic data into a node calculation model for analysis to obtain node operation data of the distribution network, wherein the node operation data is used to indicate the power operation status and load conditions of the distribution network after the distribution network accesses the access node; based on the node operation data, the three-phase current imbalance data of the distribution network is determined.

[0008] Optionally, based on the node operation data, determining the three-phase current imbalance data of the distribution network includes: inputting the node operation data into a three-phase current imbalance model for analysis to obtain the three-phase current imbalance data of the distribution network.

[0009] Optionally, based on the basic data, the line cost data of the distribution network is determined, including: extracting the newly added charge and the geographical location of the access node of the distribution network from the basic data; based on the newly added charge and the geographical location, determining the line usage data of the distribution network, wherein the line usage data is used to indicate the total amount of materials required for the distribution network to access the access node; based on the line usage data, determining the line cost data of the distribution network.

[0010] Optionally, based on the three-phase current imbalance data and the line cost data, a target access strategy for the distribution network is determined, including: inputting the three-phase current imbalance data and the line cost data into a target model for analysis to obtain multiple initial access strategies; based on the multiple initial access strategies, determining the target access strategy for the distribution network.

[0011] Optionally, based on multiple initial access strategies, a target access strategy for the distribution network is determined, including: evaluating multiple initial access strategies to obtain evaluation results, wherein the evaluation results are used to indicate three-phase current imbalance and line cost corresponding to the initial access strategies; and determining the initial access strategy with the best evaluation result as the target access strategy for the distribution network.

[0012] According to another aspect of an embodiment of the present invention, a device for determining an access strategy of a distribution network is also provided. The device may include: an acquisition unit, for acquiring basic data of the distribution network, wherein the basic data is used to indicate data related to access nodes in the distribution network; a first determination unit, for determining three-phase current imbalance data and line cost data of the distribution network based on the basic data, wherein the three-phase current imbalance data is used to indicate the degree of change of the three-phase current imbalance of the distribution network in the time period before the distribution network accesses the access node and the time period after the distribution network accesses the access node, and the line cost data is used to indicate the cost of line operation of the distribution network after the distribution network accesses the access node; a second determination unit, for determining a target access strategy of the distribution network based on the three-phase current imbalance data and the line cost data, wherein the target access strategy is used to indicate the rules for the distribution network to access the access node.

[0013] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein when the program is executed by a processor, the device where the storage medium is located is controlled to execute the method for determining the access strategy of the distribution network in an embodiment of the present invention.

[0014] According to another aspect of an embodiment of the present invention, a processor is further provided. The processor is used to run a program, wherein when the program is run, the method for determining the access strategy of the distribution network in the embodiment of the present invention is executed.

[0015] According to another aspect of the embodiments of the present invention, a computer program product is provided, which includes computer instructions, and when the computer instructions are executed by a processor, the method for determining the access strategy of the distribution network in the embodiments of the present invention is implemented.

[0016] In an embodiment of the present invention, basic data of the distribution network is obtained, wherein the basic data is used to indicate data related to access nodes in the distribution network; based on the basic data, three-phase current imbalance data and line cost data of the distribution network are determined, wherein the three-phase current imbalance data is used to indicate the degree of change of the three-phase current imbalance of the distribution network in the time period before the distribution network is connected to the access node and the time period after the distribution network is connected to the access node, and the line cost data is used to indicate the cost of line operation of the distribution network after the distribution network is connected to the access node; based on the three-phase current imbalance data and the line cost data, the target access strategy of the distribution network is determined. That is to say, the present invention determines the three-phase current imbalance data and the line cost data of the distribution network according to the basic data of the distribution network, and thus determines the target access strategy according to the three-phase current imbalance data and the line cost data, thereby solving the technical problem of being unable to determine the access strategy of the distribution network and achieving the technical effect of determining the access strategy of the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 is a flow chart of a method for determining an access strategy of a distribution network according to an embodiment of the present invention;

[0019] Figure 2 is a flow chart of a selection strategy of access points in low voltage business expansion digitization according to an embodiment of the present invention;

[0020] Figure 3 is a schematic diagram of a selection strategy system for access points in low voltage business expansion digitization according to an embodiment of the present invention;

[0021] Figure 4 It is a schematic diagram of a device for determining an access strategy of a distribution network according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 should fall within the scope of protection of the present invention.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, functional component or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, functional components or devices.

[0024] According to an embodiment of the present invention, an embodiment of a method for determining an access strategy of a distribution network is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0025] Figure 1 is a flow chart of a method for determining an access strategy of a distribution network according to an embodiment of the present invention. Figure 1 As shown, the method may include the following steps:

[0026] Step S101, obtaining basic data of the distribution network.

[0027] In the technical solution provided in the above step S101 of the present invention, the basic data is used to indicate data related to the access node in the distribution network.

[0028] In this embodiment, basic data of the distribution network is obtained, wherein the basic data may at least include: low-voltage distribution network node numbers, medium-voltage distribution network node numbers to which the low-voltage distribution network is connected, and geographical locations of newly added charges and access nodes.

[0029] For example, the basic data of the distribution network is obtained through sensors. This is only an illustrative example and does not limit the specific method for obtaining the basic data of the distribution network.

[0030] Step S102: determining three-phase current imbalance data and line cost data of the distribution network based on basic data.

[0031] In the technical solution provided in the above step S102 of the present invention, the three-phase current imbalance data is used to indicate the degree of change of the three-phase current imbalance of the distribution network in the time period before the distribution network is connected to the access node and the time period after the distribution network is connected to the access node, and the line cost data is used to indicate the cost of the line operation of the distribution network after the distribution network is connected to the access node.

[0032] In this embodiment, after the basic data of the distribution network is acquired in step S101, the three-phase current imbalance data and line cost data of the distribution network are determined according to the basic data.

[0033] Optionally, for determining the three-phase current unbalance data of the distribution network, the three-phase current unbalance data of the distribution network is determined by a three-phase unbalanced power flow calculation model. The three-phase current unbalance data model may also be referred to as a three-phase current unbalance degree.

[0034] For example, for low-voltage distribution networks, due to the existence of unbalanced loads, a three-phase power flow calculation method is usually used for power flow calculation. The power flow calculation model of the low-voltage distribution network is shown in the following formula (1). The optimal power flow calculation model is used to calculate the power flow information of the distribution network. The objective function is to minimize the line loss of the distribution network. The distribution network needs to ensure safe and stable operation. Considering that the power flow of the distribution network branch needs to meet the balance constraint, the constraint const1.1 is added. In order to ensure that the node voltage of the distribution network in each period operates within a reasonable range, the node voltage constraint const1.2 is set.

[0035]

[0036] Wherein, a and b represent the node numbers of the low-voltage distribution network; Γ represents the total node set, and s represents the node number of the medium-voltage distribution network to which the low-voltage distribution network is connected. The subscript s in this formula indicates that this parameter is a low-voltage distribution network parameter subordinate to the medium-voltage distribution network node s; U s,a,t , U s,b,t is the voltage value of nodes a and b in period t; P s,ab,t is the active power flowing through the head end of branch ab during period t; r s,ab 、x s,ab is the impedance of branch ab; Q s,ab,t is the reactive power flowing through the head end of branch ab during period t; I s,ab,t represents the current flowing through branch ab during period t; p s,b,t ,q s,b,t are the active power and reactive power injected into node b during period t; P s,bk,t , Q s,bk,t are respectively the active power and reactive power at the head end of branch bk at time t; k:b→k is represented by the set of all child nodes with b node as the parent node; U' max , U' min are the upper and lower limits of the voltage at the nodes of the low-voltage distribution network, respectively. After obtaining the three-phase power flow of the distribution network, this paper intends to use the phase current to calculate the three-phase current imbalance, as shown in the following formula (2):

[0037]

[0038] Among them, I a is the effective value of phase A current, I b is the effective value of phase B current, I c is the effective value of phase C current, I Pavg is the average value of three-phase current.

[0039] Optionally, a cost calculation module may be used to determine the line cost data of the power distribution network.

[0040] For example, the total cost of the line for business expansion is mainly determined by the distance between the new load and the access point. The present invention assumes that the specific geographical location of the new load and the access point is known, and the straight-line distance D between the two is known, and the cost calculation module is designed based on this. A pole tower is arranged at a certain distance on the line, and the total number of pole towers required for business expansion is shown in the following formula (3):

[0041]

[0042] Among them, h is the total number of towers required, γ represents the spacing of the tower distribution, and ceil represents the internal function rounded up. After the number of towers is obtained, the number of insulators required for the business expansion can be obtained based on the fixed number of insulators installed on each tower, as shown in the following formula (4):

[0043] q=λh (4)

[0044] Where q is the number of insulators, and λ is the number of insulators required on each tower. The line material is determined according to the line distance D, as shown in the following formula (5):

[0045] u=D×4×μ (1<μ<1.1) (5)

[0046] Among them, u is the total amount of line materials, and μ is the inclination influence coefficient of line materials. Since the line itself has a certain weight, under the influence of gravity, the line usually bends to a certain extent. Therefore, consider multiplying the total length by a tilt influence coefficient. At the same time, since the three-phase four-wire system is adopted, each tower is connected by four lines to calculate the total amount of line materials. The total line cost calculation is shown in the following formula (6):

[0047] C=C h h+C q q+C u u (6)

[0048] Among them, C h is the tower unit price, C q is the unit price of insulator, C u It is the price per unit length of line materials.

[0049] Step S103: determining a target access strategy for the distribution network based on the three-phase current imbalance data and the line cost data.

[0050] In the technical solution provided in the above step S103 of the present invention, the target access strategy is used to indicate the rules for the distribution network to access the access node.

[0051] In this embodiment, after the three-phase current imbalance data and the line cost data of the distribution network are determined in step S102, the target access strategy of the distribution network is determined according to the three-phase current imbalance data and the line cost data.

[0052] Optionally, a fuzzy multi-objective optimization objective function is designed based on the three-phase current imbalance data and the line cost data, so as to determine the target access strategy of the distribution network based on the objective function.

[0053] For example, by considering the impact of the newly added load on the three-phase imbalance and the line cost after the newly added load is connected, the fuzzy multi-objective optimization objective function based on the optimal three-phase imbalance and line cost is set as shown in the following formula (7):

[0054]

[0055] Among them, N is the total number of new users, C n,i The line cost PVIR when the nth new user connects to the i-th access point is the three-phase imbalance of the access backend area, and α and β are the weights of the line cost and the three-phase imbalance respectively. The introduced α and β values ​​can be set according to the actual project situation. According to the calculation results, the solution when f(x) achieves the lowest value is the optimal access solution for the comprehensive three-phase imbalance and line cost, and the lowest f(x) value can be obtained using optimization algorithms such as genetic algorithms.

[0056] It should be noted that the above embodiment can be implemented by an intelligent tracking and photographing system for high-altitude work safety belt identification.

[0057] In the above steps S101 to S103 of the present invention, basic data of the distribution network is obtained, wherein the basic data is used to indicate data related to the access node in the distribution network; based on the basic data, the three-phase current imbalance data and line cost data of the distribution network are determined, wherein the three-phase current imbalance data is used to indicate the degree of change of the three-phase current imbalance of the distribution network in the time period before the distribution network is connected to the access node and the time period after the distribution network is connected to the access node, and the line cost data is used to indicate the cost of line operation of the distribution network after the distribution network is connected to the access node; based on the three-phase current imbalance data and the line cost data, the target access strategy of the distribution network is determined. That is to say, the present invention determines the three-phase current imbalance data and the line cost data of the distribution network according to the basic data of the distribution network, and thus determines the target access strategy according to the three-phase current imbalance data and the line cost data, thereby solving the technical problem of being unable to determine the access strategy of the distribution network and achieving the technical effect of determining the access strategy of the distribution network.

[0058] The above method of this embodiment is further introduced below.

[0059] As an optional implementation method, based on basic data, the three-phase current imbalance data of the distribution network is determined, including: inputting the basic data into a node calculation model for analysis to obtain the node operation data of the distribution network, wherein the node operation data is used to indicate the power operation status and load conditions of the distribution network after the distribution network accesses the access node; based on the node operation data, the three-phase current imbalance data of the distribution network is determined.

[0060] In this embodiment, the basic data is input into the node calculation model for analysis to obtain the node operation data of the distribution network. The node calculation model can also be called a power flow data analysis model, and the node operation data can also be called the three-phase power flow data of the distribution network.

[0061] Optionally, the node operation data of the distribution network can be calculated according to the above formula (1), which will not be described in detail here.

[0062] Optionally, after determining the node operation data, the three-phase current imbalance data of the distribution network is determined according to the node operation data, and the specific determination method will be described in detail later.

[0063] As an optional implementation method, based on the node operation data, the three-phase current imbalance data of the distribution network is determined, including: inputting the node operation data into a three-phase current imbalance model for analysis to obtain the three-phase current imbalance data of the distribution network.

[0064] In this embodiment, the node operation data is input into the three-phase current imbalance model for analysis to obtain the three-phase current imbalance data of the distribution network. The three-phase current imbalance data model can also be called a three-phase current imbalance degree calculation model.

[0065] Optionally, the specific three-phase current unbalance data model is as shown in the above formula (2), which will not be described again here.

[0066] As an optional implementation method, based on basic data, the line cost data of the distribution network is determined, including: extracting the newly added charge and the geographical location of the access node of the distribution network from the basic data; based on the newly added charge and the geographical location, determining the line usage data of the distribution network, wherein the line usage data is used to indicate the total amount of materials required for the distribution network to access the access node; based on the line usage data, determining the line cost data of the distribution network.

[0067] In this embodiment, the newly added charges and the geographical locations of the access nodes of the distribution network are extracted from the basic data, and the distance between the newly added load and the access point is determined according to the newly added charges and the geographical locations, thereby determining the line usage data of the distribution network. The line usage data is data for determining line usage according to line distance.

[0068] Optionally, the specific method for determining the line usage data of the distribution network is as shown in the above formulas (3) to (5), which will not be repeated here.

[0069] Optionally, after determining the line usage data, the line cost data of the distribution network is determined according to the line usage data. The specific calculation method is shown in the above formula (6) and will not be repeated here.

[0070] As an optional implementation method, based on three-phase current imbalance data and line cost data, a target access strategy for the distribution network is determined, including: inputting the three-phase current imbalance data and line cost data into a target model for analysis to obtain multiple initial access strategies; based on the multiple initial access strategies, determining the target access strategy for the distribution network.

[0071] In this embodiment, the three-phase current imbalance data and line cost data are input into the target model for analysis to obtain multiple initial access strategies. The target model can be a fuzzy multi-objective optimization objective function. The specific target model is shown in the above formula (7), which will not be described here.

[0072] Optionally, based on multiple initial access strategies, a target access strategy for the distribution network is determined. For example, in the case of multiple access points, it supports simultaneous calculation of the power flow distribution of multiple low-voltage users accessing different phases at each access point, obtains the three-phase imbalance and line cost of different access schemes, and determines the optimal access scheme based on the calculation results of the objective function.

[0073] As an optional implementation method, based on multiple initial access strategies, a target access strategy for the distribution network is determined, including: evaluating multiple initial access strategies to obtain evaluation results, wherein the evaluation results are used to indicate the three-phase current imbalance and line cost corresponding to the initial access strategies; and determining the initial access strategy with the best evaluation result as the target access strategy for the distribution network.

[0074] In this embodiment, multiple initial access strategies are evaluated to obtain evaluation results, and then the multiple evaluation results are compared.

[0075] Optionally, an initial access strategy with the best evaluation result is selected, that is, the access method under the initial access strategy is the best method. Based on this, the initial access strategy with the best evaluation result can be determined as the target access strategy of the distribution network.

[0076] It should be noted that the above embodiment can be implemented by an intelligent tracking and photographing system for high-altitude work safety belt identification.

[0077] In this embodiment, basic data of the distribution network is obtained, wherein the basic data is used to indicate data related to the access node in the distribution network; based on the basic data, the three-phase current imbalance data and line cost data of the distribution network are determined, wherein the three-phase current imbalance data is used to indicate the degree of change of the three-phase current imbalance of the distribution network in the time period before the distribution network is connected to the access node and the time period after the distribution network is connected to the access node, and the line cost data is used to indicate the cost of line operation of the distribution network after the distribution network is connected to the access node; based on the three-phase current imbalance data and the line cost data, the target access strategy of the distribution network is determined. That is to say, the present invention determines the three-phase current imbalance data and the line cost data of the distribution network according to the basic data of the distribution network, and thus determines the target access strategy according to the three-phase current imbalance data and the line cost data, thereby solving the technical problem of being unable to determine the access strategy of the distribution network and achieving the technical effect of determining the access strategy of the distribution network.

[0078] The technical solution of the embodiment of the present invention is illustrated below in conjunction with preferred implementation modes.

[0079] At present, in the current power industry, customers' electricity demand is growing, and the requirements for service quality are also increasing. Business expansion registration, as the first step for power companies to establish power supply and use relationships with new and old customers, is not only related to the stable operation of the power system, but also directly affects customers' electricity experience and the market competitiveness of power companies. In the power industry, the selection of access points during low-voltage power grid expansion mainly refers to determining the specific location where the new load is connected to the existing low-voltage power grid. In the process of business expansion registration, the selection of access points is very critical. The ideal access point should first ensure the quality of power supply, that is, the selected access point can provide stable voltage and sufficient capacity to meet the customer's current and future electricity needs. Secondly, the economy should be considered, and the access solution close to the load center, with the shortest path and low construction cost should be selected to reduce transmission losses.

[0080] In the related art, manual experience-based judgment of access points is often used in actual operations. Adopting the principle of proximity, the nearby access points are directly found, and one of the three phases is selected for access based on experience. However, the traditional method, that is, manual experience-based judgment of access points, is highly subjective and does not consider the three-phase imbalance of the system after access, resulting in increased losses in distribution transformers and lines, affecting the overall power supply quality, and endangering the safety and life of the low-voltage distribution network. Therefore, there is a technical problem that the access strategy of the distribution network cannot be determined. At present, no effective solution has been proposed for the above-mentioned technical problem that the access strategy of the distribution network cannot be determined.

[0081] However, an embodiment of the present invention proposes a strategy for selecting access points in low-voltage business expansion digitization. A power flow data analysis model is established to evaluate the degree of change in three-phase imbalance before and after the access of the new solution. Secondly, the construction cost of the new solution is calculated through line data. Finally, a multi-customer access solution evaluation function based on three-phase imbalance and construction cost is proposed to determine the optimal access solution, which solves the technical problem of being unable to determine the access strategy of the distribution network and achieves the technical effect of determining the access strategy of the distribution network.

[0082] The embodiments of the present invention are further described below.

[0083] Figure 2 1 is a flow chart of a selection strategy of an access point in low voltage business expansion digitization according to an embodiment of the present invention, the selection strategy comprising the following steps:

[0084] Step S201: business expansion application and on-site inspection.

[0085] In this embodiment, a business expansion request is applied for, and after approval, a site survey is conducted to collect data.

[0086] Step S202, determining the impact of multiple newly added loads on the three-phase imbalance.

[0087] In this embodiment, for the low voltage distribution network, due to the existence of unbalanced load, a three-phase power flow calculation method is usually used for power flow calculation. The power flow calculation model of the low voltage distribution network is shown in the above formula (1), which will not be described here.

[0088] Optionally, the optimal power flow calculation model is used to calculate the power flow information of the distribution network. The objective function is to minimize the line loss of the distribution network. The distribution network needs to ensure safe and stable operation. Considering that the branch power flow of the distribution network needs to meet the balance constraint, constraint const1.1 is added. In order to ensure that the node voltage of the distribution network operates within a reasonable range in each period, the node voltage constraint const1.2 is set.

[0089] Optionally, after obtaining the three-phase power flow of the distribution network, this paper intends to use the phase current to calculate the three-phase current imbalance, as shown in the above formula (2), which will not be repeated here. The three-phase imbalance of the substation area is obtained by the three-phase current value on the low-voltage side of the substation transformer, which can be used as an evaluation indicator for evaluating the optimal access phase.

[0090] Step S203, determining the line cost after the newly added load is connected.

[0091] In this embodiment, the total line cost of the business expansion is mainly determined by the distance between the newly added load and the access point. The present invention assumes that the specific geographical locations of the newly added load and the access point are known, and the straight-line distance D between the two is known, and the cost calculation module is designed based on this.

[0092] Optionally, a pole tower is arranged at a certain interval on the line. The total number of pole towers required for the expansion is as shown in the above formula (3), which will not be repeated here.

[0093] Optionally, after obtaining the number of pole towers, the number of insulators required for the business expansion can be obtained based on the fixed number of insulators installed on each pole tower, as shown in the above formula (4), which will not be repeated here.

[0094] Optionally, the line material is determined according to the line distance D, as shown in the above formula (5), which will not be repeated here. Since the line itself has a certain weight, under the influence of gravity, the line usually bends to a certain extent. Therefore, consider multiplying the total length by a tilt influence coefficient. At the same time, since the three-phase four-wire system is adopted, each tower is connected by four lines, and the total amount of line material is calculated.

[0095] Optionally, the total line cost is calculated as shown in the above formula (6), which will not be described again here.

[0096] Step S204: determine the optimal access solution according to the objective function calculation result.

[0097] In this embodiment, through the results of the above two modules, the impact of the new load on the three-phase imbalance and the line cost after the new load is connected can be obtained. Then, the fuzzy multi-objective optimization objective function based on the optimal three-phase imbalance and line cost is set as shown in the above formula (7), which will not be repeated here.

[0098] Optionally, the introduced α and β values ​​can be set according to the actual engineering situation. According to the calculation results, the solution when f(x) achieves the lowest value is the optimal access solution considering the three-phase imbalance and line cost, and an optimization algorithm such as a genetic algorithm can be used to obtain the lowest f(x) value.

[0099] Alternatively, in the traditional method, that is, manually judging the access point based on experience, the proximity principle is often adopted, while the three-phase imbalance of the substation is ignored. When formula (7) is applied, the value of β is 0, that is, when all new loads are connected to the nearest access point, the f(x) value is the smallest.

[0100] Figure 3 It is a schematic diagram of an access point selection strategy system in low-voltage business expansion digitization according to an embodiment of the present invention. The selection strategy system 300 includes: a three-phase imbalance calculation module 301, a business expansion line cost calculation module 302 and a low-voltage business expansion application multi-user multi-access point selection module 303.

[0101] The three-item unbalance degree calculation module 301 is used for three-phase unbalanced power flow calculation and three-phase current unbalance degree calculation.

[0102] The business expansion line cost calculation module 302 is used to calculate the line cost after the new load is connected.

[0103] Optionally, the total line cost of the business expansion is mainly determined by the distance between the newly added load and the access point. The present invention assumes that the specific geographical locations of the newly added load and the access point are known, and the straight-line distance D between the two is known, and the cost calculation module 302 is designed based on this.

[0104] The low-voltage business expansion application multi-user multi-access point selection module 303 is used to support the simultaneous calculation of the power flow distribution of multiple low-voltage users accessing different phases at each access point when there are multiple access points, obtain the three-phase imbalance and line cost of different access schemes, and determine the optimal access scheme based on the objective function calculation results.

[0105] Optionally, through the results of the three-item imbalance calculation module 301 and the business expansion line cost calculation module 302, the impact of the new load on the three-phase imbalance and the line cost after the new load is connected can be obtained, and then a fuzzy multi-objective optimization objective function based on the optimal three-phase imbalance and line cost is set.

[0106] Optionally, the present invention needs to determine the access point selection for multiple loads, while comprehensively considering the three-phase imbalance of the entire system after access and the construction cost of the entire project. Therefore, it is necessary to first design a three-phase imbalance calculation module, which calculates the impact of a single new load access on the three-phase imbalance of the substation. Secondly, design a business expansion line cost calculation module to calculate the cost of a single new solution. Finally, design a low-voltage business expansion application multi-user multi-access point selection module. According to the results of the above two modules, design an optimization function to obtain the best access point selection solution under multi-user access.

[0107] In this embodiment, a power flow data analysis model is established to evaluate the degree of change in the three-phase imbalance before and after the new scheme is connected. Secondly, the construction cost of the new scheme is calculated through line data. Finally, a multi-customer access scheme evaluation function based on three-phase imbalance and construction cost is proposed to determine the optimal access scheme, which solves the technical problem of being unable to determine the access strategy of the distribution network and achieves the technical effect of determining the access strategy of the distribution network.

[0108] According to an embodiment of the present invention, a device for determining an access strategy of a distribution network is also provided. It should be noted that the device for determining an access strategy of a distribution network can be used to execute the method for determining an access strategy of a distribution network in the method embodiment.

[0109] Figure 4 Schematic diagram of a device for determining an access strategy for a distribution network according to an embodiment of the present invention. Figure 4As shown, the device 400 for determining the access strategy of the distribution network may include: an acquisition unit 401 , a first determination unit 402 , and a second determination unit 403 .

[0110] The acquisition unit 401 is used to acquire basic data of the distribution network, wherein the basic data is used to indicate data related to access nodes in the distribution network.

[0111] The first determination unit 402 is used to determine the three-phase current imbalance data and line cost data of the distribution network based on the basic data, wherein the three-phase current imbalance data is used to indicate the degree of change of the three-phase current imbalance of the distribution network in a time period before the distribution network is connected to the access node and a time period after the distribution network is connected to the access node, and the line cost data is used to indicate the cost of line operation of the distribution network after the distribution network is connected to the access node.

[0112] The second determining unit 403 is used to determine a target access strategy of the distribution network based on the three-phase current imbalance data and the line cost data, wherein the target access strategy is used to indicate a rule for the distribution network to access the access node.

[0113] Optionally, the first determination unit 402 may include: a first analysis module, used to input basic data into a node calculation model for analysis to obtain node operation data of the distribution network, wherein the node operation data is used to indicate the power operation status and load conditions of the distribution network after the distribution network accesses the access node; a first determination module, used to determine the three-phase current imbalance data of the distribution network based on the node operation data.

[0114] Optionally, the first determination module may include: an analysis submodule, configured to input the node operation data into a three-phase current imbalance model for analysis to obtain three-phase current imbalance data of the distribution network.

[0115] Optionally, the first determination unit 402 also includes: an extraction module, used to extract the newly added charge of the distribution network and the geographical location of the access node from the basic data; a second determination module, used to determine the line usage data of the distribution network based on the newly added charge and the geographical location, wherein the line usage data is used to indicate the total amount of materials required for the distribution network to access the access node; and a third determination module, used to determine the line cost data of the distribution network based on the line usage data.

[0116] Optionally, the second determination unit 403 may include: a second analysis module, used to input three-phase current imbalance data and line cost data into the target model for analysis to obtain multiple initial access strategies; a fourth determination module, used to determine the target access strategy of the distribution network based on the multiple initial access strategies.

[0117] Optionally, the fourth determination module may include: an evaluation submodule, used to evaluate multiple initial access strategies to obtain evaluation results, wherein the evaluation results are used to indicate the three-phase current imbalance and line cost corresponding to the initial access strategies; a determination submodule, used to determine the initial access strategy with the best evaluation result as the target access strategy of the distribution network.

[0118] In this embodiment, basic data of the distribution network is obtained, wherein the basic data is used to indicate data related to the access node in the distribution network; based on the basic data, the three-phase current imbalance data and line cost data of the distribution network are determined, wherein the three-phase current imbalance data is used to indicate the degree of change of the three-phase current imbalance of the distribution network in the time period before the distribution network is connected to the access node and the time period after the distribution network is connected to the access node, and the line cost data is used to indicate the cost of line operation of the distribution network after the distribution network is connected to the access node; based on the three-phase current imbalance data and the line cost data, the target access strategy of the distribution network is determined. That is to say, the present invention determines the three-phase current imbalance data and the line cost data of the distribution network according to the basic data of the distribution network, and thus determines the target access strategy according to the three-phase current imbalance data and the line cost data, thereby solving the technical problem of being unable to determine the access strategy of the distribution network and achieving the technical effect of determining the access strategy of the distribution network.

[0119] According to an embodiment of the present invention, a computer-readable storage medium is further provided, the storage medium comprising a stored program, wherein the program executes the method for determining the access strategy of the distribution network in the method embodiment.

[0120] According to an embodiment of the present invention, a processor is further provided, the processor being used to run a program, wherein when the program is run, the method for determining the access strategy of the distribution network in the method embodiment is executed.

[0121] According to an embodiment of the present invention, a computer program product is further provided. The computer program product includes computer instructions. When the computer instructions are executed by a processor, the method for determining the access strategy of the distribution network in the method embodiment is implemented.

[0122] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0123] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0124] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0125] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed over multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0126] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0127] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent functional component, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software functional component, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc., which can store program codes.

[0128] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for determining an access strategy for a distribution network, characterized in that: include: Acquire basic data of a distribution network, wherein the basic data is used to indicate data related to access nodes in the distribution network; Based on the basic data, determine the three-phase current imbalance data and line cost data of the distribution network, wherein the three-phase current imbalance data is used to indicate the degree of change of the three-phase current imbalance of the distribution network in a time period before the distribution network is connected to the access node and a time period after the distribution network is connected to the access node, and the line cost data is used to indicate the cost of line operation of the distribution network after the distribution network is connected to the access node; Based on the three-phase current imbalance data and the line cost data, a target access strategy of the distribution network is determined, wherein the target access strategy is used to indicate a rule for the distribution network to access the access node.

2. The method according to claim 1, characterized in that Determining three-phase current imbalance data of the distribution network based on the basic data includes: Inputting the basic data into a node calculation model for analysis to obtain node operation data of the distribution network, wherein the node operation data is used to indicate the power operation state and load condition of the distribution network after the distribution network accesses the access node; The three-phase current imbalance data of the power distribution network is determined based on the node operation data.

3. The method according to claim 2, characterized in that Determining the three-phase current imbalance data of the distribution network based on the node operation data includes: The node operation data is input into a three-phase current imbalance model for analysis to obtain the three-phase current imbalance data of the distribution network.

4. The method according to claim 1, characterized in that: Based on the basic data, determining line cost data of the distribution network includes: Extracting the newly added charge of the distribution network and the geographical location of the access node from the basic data; Determining line usage data of the distribution network based on the newly added charge and the geographical location, wherein the line usage data is used to indicate a total amount of material required by the distribution network to access the access node; Based on the line usage data, the line cost data of the power distribution network is determined.

5. The method according to claim 1, characterized in that Determining the distribution network target access strategy based on the three-phase current imbalance data and the line cost data includes: Inputting the three-phase current imbalance data and the line cost data into a target model for analysis to obtain a plurality of initial access strategies; Based on the multiple initial access strategies, the target access strategy of the distribution network is determined.

6. The method according to claim 5, characterized in that Determining the target access strategy of the distribution network based on the multiple initial access strategies includes: Evaluate the multiple initial access strategies to obtain evaluation results, wherein the evaluation results are used to indicate the three-phase current imbalance and line cost corresponding to the initial access strategies; The initial access strategy with the optimal evaluation result is determined as the target access strategy of the distribution network.

7. A device for determining an access strategy of a distribution network, characterized in that: include: An acquisition unit, configured to acquire basic data of a distribution network, wherein the basic data is used to indicate data related to access nodes in the distribution network; a first determining unit, configured to determine, based on the basic data, three-phase current imbalance data and line cost data of the distribution network, wherein the three-phase current imbalance data is used to indicate a degree of change in the three-phase current imbalance of the distribution network between a time period before the distribution network is connected to the access node and a time period after the distribution network is connected to the access node, and the line cost data is used to indicate a cost of line operation of the distribution network after the distribution network is connected to the access node; The second determination unit is used to determine a target access strategy of the distribution network based on the three-phase current imbalance data and the line cost data, wherein the target access strategy is used to indicate a rule for the distribution network to access the access node.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed by a processor, the device where the storage medium is located is controlled to execute the method according to any one of claims 1 to 6.

9. A processor, characterized in that: The processor is used to run a program, wherein the program executes the method according to any one of claims 1 to 6 when running.

10. A computer program product, characterized in that The computer program product comprises computer instructions, which implement the method according to any one of claims 1 to 6 when executed by a processor.

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