CN117374928A - Medium-voltage line planning method, device and equipment for power distribution network and storage medium - Google Patents
Medium-voltage line planning method, device and equipment for power distribution network and storage medium Download PDFInfo
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Abstract
The invention discloses a medium-voltage line planning method, a medium-voltage line planning device, medium-voltage line planning equipment and a medium, wherein the method comprises the following steps: constructing a distribution network medium voltage line planning model aiming at minimizing the total cost of the distribution network medium voltage line planning according to the basic data of the distribution network and preset constraint conditions; the basic data at least comprises distribution data and load forecast values of a distribution transformer, an upper-level substation and a road network; the preset constraint conditions at least comprise line relation constraint, line legality and minimum constraint, line existence constraint, line access distribution total constraint, distribution network access constraint and upper-level substation network access constraint of the distribution transformer; and solving a medium voltage line planning model of the distribution network by using a solver to obtain an optimal medium voltage line wiring scheme of the distribution network. The invention improves the efficiency of the medium-voltage distribution network line planning work, ensures the power supply reliability as much as possible under the condition of ensuring the minimum total cost of line planning, and can ensure the safe and stable operation of the power system.
Description
Technical Field
The present invention relates to the field of power distribution network technologies, and in particular, to a method, an apparatus, a device, and a storage medium for planning a medium voltage line of a power distribution network.
Background
The distribution network is a core link facing to the supply of user power energy and is also an important infrastructure for realizing the conversion and utilization of electric energy. For urban power supply, reasonable and accurate power distribution network planning can improve reliability and stability of power supply on one hand, reduce energy consumption and operation cost of a power system on the other hand, and help power grid companies to realize intelligent management, so that efficiency and safety of power supply are improved.
In the aspect of line planning of a medium-low voltage power distribution network, the current planning method is mainly carried out by a traditional manual offline mode, and planning is carried out by a mode of empirical formula or direct copying of the existing line, and the like, and the planning mode has the following defects: lack of digital technical support results in relatively low planning efficiency; depending on experience and rules, there is a lack of science and accuracy; the problems of repeated construction caused by overload and short circuit are easy to occur due to insufficient reliability, safety and other aspects of the circuit.
Disclosure of Invention
The invention aims to provide a medium-voltage line planning method, device and equipment for a power distribution network and a storage medium, so as to solve the technical problems that the current power distribution network line planning method is low in efficiency, and hidden danger exists in the aspects of reliability and safety in line planning.
The aim of the invention can be achieved by the following technical scheme:
the scheme I is a medium-voltage line planning method of a power distribution network, comprising the following steps:
constructing a distribution network medium voltage line planning model aiming at minimizing the total cost of the distribution network medium voltage line planning according to the basic data of the distribution network and preset constraint conditions;
the basic data at least comprises distribution data and load prediction values of a distribution transformer, an upper-level substation and a road network; the preset constraint conditions at least comprise line relation constraint, line legality and minimum constraint, line existence constraint, line access distribution total constraint, distribution network constraint and upper-level substation network constraint of distribution transformers;
and solving the medium voltage line planning model of the distribution network by using a solver to obtain an optimal medium voltage line wiring scheme of the distribution network.
Optionally, the objective function of the distribution network medium voltage line planning model is:
wherein C is f Representing a flat fee; c (C) v Representing a variable cost as a function of line length, proportional to line length; r is the discount rate; m is depreciation age; c (C) l Annual cost for estimated network loss; and C is the total cost of power distribution network line planning, and represents the sum of annual investment cost and annual operating cost of the planning level.
Optionally, before constructing the distribution network medium voltage line planning model aiming at minimizing the total cost of the distribution network medium voltage line planning, the method further comprises:
determining two upper-level transformer stations connected with each distribution transformer in the power distribution network;
acquiring all switch stations to which all distribution transformers connected with the same two substations belong, and determining road nodes required to pass through by the looped network lines distributed along a road network when only one looped network line exists between the two substations; the looped network line is a shortest path which is distributed along a road network and passes through each switching station;
when a plurality of looped network lines passing through different switch stations exist between the two substations, all distribution transformers are divided into a plurality of outgoing line levels, only one looped network line exists between the two substations in each outgoing line level, and road nodes which need to be passed through by the looped network lines corresponding to each outgoing line level are distributed along a road network.
Optionally, the determining the road nodes through which the looped network line needs to pass along the road network includes:
acquiring all switch stations to which all distribution transformers connected with the same two substations belong;
taking the two substations as a starting point and an ending point respectively, and solving the shortest path which is distributed along a road network and passes through each switching station based on an improved travel business algorithm;
and taking the shortest path as a looped network line of the two substations, wherein the road nodes on the shortest path are road nodes which the looped network line needs to pass through when distributed along a road network.
Optionally, the line relation constraint to which the configuration transformer belongs is:
in the method, in the process of the invention,indicating whether the distribution transformer t belongs to a line l in the w-th outlet level, and is an integer variable of 0-1; s is(s) l1 Sum s l2 Respectively representing the start-up level substation and the end-up level substation of line l, +.> Is an integer of 0-1A strategy variable representing whether the distribution transformer t is respectively connected with the upper-level transformer station s in the w-th outlet level l1 Sum s l2 There is a connection relationship.
Optionally, the line validity and minimum constraints are:
in the method, in the process of the invention,the legal network length of the line l passing through p switchyard in the w-th outlet level is a positive real continuous variable; l (L) lp Representing the actual road network length of the line i through the p switchyard; />Representing a set of switchyard elements included in a line l passing through p switchyards, which is obtained based on an improved travel quotient algorithm; f (f) OR (. Cndot.) and f MIN (. Cndot.) is a logical operation function representing a logical OR and a minimum, respectively; />Representing all the distribution transformer sets contained in the kth switching station; m is M Big And M Small Representing a large and nearly 0 constant, respectively.
Optionally, the upper level substation access constraint is:
wherein N is W For the total number of the outgoing line levels, w are the numbers of the outgoing line levels, t is the number of the distribution transformer, N T In order to make up the total number of the variations,is an integer decision variable of 0-1, representing the distribution transformer t and the upper level in the w-th outlet levelWhether the transformer substation s has a connection relationship.
Scheme two, a medium voltage line planning device of distribution network includes:
the model construction module is used for constructing a distribution network medium-voltage line planning model aiming at minimizing the total cost of the distribution network medium-voltage line planning according to the basic data of the distribution network and preset constraint conditions;
the basic data at least comprises distribution data and load prediction values of a distribution transformer, an upper-level substation and a road network; the preset constraint conditions at least comprise line relation constraint, line legality and minimum constraint, line existence constraint, line access distribution total constraint, distribution network constraint and upper-level substation network constraint of distribution transformers;
and the model solving module is used for solving the medium voltage line planning model of the distribution network by utilizing a solver to obtain an optimal medium voltage line wiring scheme of the distribution network.
In a third aspect, an electronic device includes: a processor and a memory;
wherein the memory stores a computer program, the processor implementing the steps of aspect one when executing the computer program.
In a fourth aspect, a computer readable storage medium has stored thereon a computer program which, when executed by a processor, performs the steps of the first aspect.
The invention discloses a medium-voltage line planning method, a medium-voltage line planning device, medium-voltage line planning equipment and a medium, wherein the method comprises the following steps: constructing a distribution network medium voltage line planning model aiming at minimizing the total cost of the distribution network medium voltage line planning according to the basic data of the distribution network and preset constraint conditions; the basic data at least comprises distribution data and load prediction values of a distribution transformer, an upper-level substation and a road network; the preset constraint conditions at least comprise line relation constraint, line legality and minimum constraint, line existence constraint, line access distribution total constraint, distribution network constraint and upper-level substation network constraint of distribution transformers; and solving the medium voltage line planning model of the distribution network by using a solver to obtain an optimal medium voltage line wiring scheme of the distribution network.
Based on the technical scheme, the invention has the beneficial effects that:
when the distribution network medium voltage line planning model with the optimal economical efficiency as the target is constructed, basic data such as the distribution condition of switch stations, the distribution condition of a road network, a load forecast value and the like of the distribution network are fully considered, and the reliability and the safety of a medium voltage line wiring scheme of the distribution network can be ensured by preset constraint conditions. According to the invention, the solver is utilized to solve the medium-voltage line planning model of the distribution network, so that an optimal medium-voltage line wiring scheme of the distribution network with minimum total cost can be automatically generated, and the efficiency of medium-voltage distribution network line planning work is greatly improved; the obtained medium-voltage line planning result of the power distribution network ensures the power supply reliability as far as possible under the condition of ensuring the minimum total cost of line planning, and can ensure the safe and stable operation of the power system.
Drawings
FIG. 1 is a schematic flow chart of a first embodiment of the method of the present invention;
FIG. 2 is a schematic flow chart of a second embodiment of the method of the present invention;
fig. 3 is a schematic diagram of a first ring network circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a second ring network circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a third ring network circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a fourth ring network circuit according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a fifth ring network circuit according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a sixth ring network circuit according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a seventh ring network circuit according to an embodiment of the present invention;
fig. 10 is a schematic diagram of an eighth ring network circuit according to an embodiment of the present invention;
fig. 11 is a schematic structural view of an embodiment of the device of the present invention.
Detailed Description
The embodiment of the invention provides a medium-voltage line planning method, device and equipment for a power distribution network and a storage medium, which are used for solving the technical problems that the current power distribution network line planning method is low in efficiency and has hidden troubles in the aspects of reliability and safety.
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The medium-voltage distribution network is positioned at the downstream of the system power network and is a bridge for connecting a terminal power user and a large power network, and the electric energy quality and the power supply reliability of the user are directly related. In the planning and design of a power distribution network, the grid frame structure selection directly determines the engineering economy and the power supply reliability of the power grid.
The medium-voltage distribution network can adopt overhead lines, and can also adopt cable lines according to urban and power grid planning. When an overhead line is adopted, a multi-section moderate connection wiring, a ring network wiring and a radiation wiring can be adopted according to the density importance degree of the power load; when the cable line is adopted, a single-ring network, a double-ring network, a single-radiation type, a network format, a double-radiation type and a correlation type can be adopted according to the load density and the importance degree.
The medium-voltage distribution line comprises a main line and branch lines; the main line mainly refers to a medium-voltage line fed out from a transformer substation, an incoming line of a switching station and a medium-voltage ring network line, and the branch line refers to a line led to a power distribution facility.
The voltage class of the domestic medium-voltage distribution network is divided into 10kV, 20kV and 6kV, wherein 10kV is the main voltage class.
1) Typical wiring modes of the overhead network mainly comprise multi-section single radiation, multi-section single connection, multi-section moderate connection and the like, the sectional implementation is that a sectional switch is arranged, the connection implementation is that a connection switch is arranged, the closed-loop design and open-loop operation of the power distribution network are realized through the sectional connection and connection of a line, so that the power outage range is reduced, the load transfer of a non-fault section during line faults is realized, and the power supply reliability of the power distribution network is improved.
2) The typical wiring mode of the cable network mainly comprises single ring type, double ring type, two supplies and one standby, N supplies and one standby and the like, the segmentation is specifically realized by adopting ring network unit segmentation, the cable network is laid out according to ring network arrangement and open-loop operation, and a ring network chamber (box) is accessed to a backbone network in a ring-in and ring-out mode.
Based on the existing development trend of a novel power system, the development of a digital auxiliary decision-making tool is a key technology which needs to be overcome in the current power distribution network planning. Aiming at the problems that the current power distribution network line planning depends on experience rules, lacks digital technical support and has lower planning efficiency, the medium voltage line planning method of the power distribution network provided by the embodiment of the invention is a medium voltage line planning method of the power distribution network considering road network factors, and can automatically generate a wiring scheme of the medium voltage line of the power distribution network meeting the optimal economical efficiency, so that the method can be used for assisting the work of power distribution network planners and improving the planning work efficiency.
Referring to fig. 1, the present invention provides an embodiment of a medium voltage line planning method for a power distribution network, including:
s100: constructing a distribution network medium-voltage line planning model aiming at minimizing the total cost of the distribution network line planning according to the basic data of the distribution network and preset constraint conditions;
the basic data at least comprises distribution data and load prediction values of a distribution transformer, an upper-level substation and a road network; the preset constraint conditions at least comprise line relation constraint, line legality and minimum constraint, line existence constraint, line access distribution total constraint, distribution network constraint and upper-level substation network constraint of distribution transformers;
s200: and solving the medium voltage line planning model of the distribution network by using a solver to obtain an optimal medium voltage line wiring scheme of the distribution network.
The embodiment of the invention relates to a medium-voltage line planning method of a power distribution network considering road network factors, which aims at optimizing the medium-voltage line planning economy of the power distribution network according to the distribution of switch stations and the distribution situation of the road network, establishes a medium-voltage line planning model of the power distribution network considering the road network factors, solves the medium-voltage line planning model of the power distribution network considering the road network factors by adopting a solver such as a Gurobi solver, and automatically generates a wiring scheme of a medium-voltage line.
In one embodiment, before constructing the distribution network medium voltage line planning model aiming at minimizing the total cost of the distribution network medium voltage line planning, the method further comprises:
determining two upper-level transformer stations connected with each distribution transformer in the power distribution network;
acquiring all switch stations to which all distribution transformers connected with the same two substations belong, and determining road nodes required to pass through by the looped network lines distributed along a road network when only one looped network line exists between the two substations; the looped network line is a shortest path which is distributed along a road network and passes through each switching station;
when a plurality of looped network lines passing through different switch stations exist between the two substations, all distribution transformers are divided into a plurality of outgoing line levels, only one looped network line exists between the two substations in each outgoing line level, and road nodes which need to be passed through by the looped network lines corresponding to each outgoing line level are distributed along a road network.
Wherein determining the road nodes through which the looped network lines need to pass along the road network distribution comprises:
acquiring all switch stations to which all distribution transformers connected with the same two substations belong;
taking the two substations as a starting point and an ending point respectively, and solving the shortest path which is distributed along a road network and passes through each switching station based on an improved travel business algorithm;
and taking the shortest path as a looped network line of the two substations, wherein the road nodes on the shortest path are road nodes which the looped network line needs to pass through when distributed along a road network.
Specifically, in implementation, a medium-voltage line planning model of the power distribution network considering road network factors is used for simplifying the line planning problem before planning. Since the possible solutions of the line between the superordinate substation and the switchyard show an almost exponential increase when the number of superordinate substations and switchyards increases. Therefore, there is a need to simplify the problem of line planning, so that the space for optimizing solutions is reduced. The simplification is as follows:
(1) Considering that each distribution transformer is connected with 2 upper-level transformer stations under the ring network structure, the decision quantity of the planning model is directly set as the 2 upper-level transformer stations connected with each distribution transformer.
(2) After the 2 upper-level transformer stations connected with each distribution transformer are determined, the trend of all lines along a road network (short for road network) can be determined.
The specific determination method comprises the following steps: all switch stations to which all distribution transformers connected with the same 2 substations belong are obtained, based on an improved travel algorithm, the 2 substations are respectively used as a starting point and an ending point, the shortest line distributed along a road network and passing through each switch station is solved, and the shortest line is used as a ring network line of the 2 substations.
The improved traveling salesman algorithm is that virtual nodes with the distances of 0 from 2 substations are set on the basis of the Lin-Kernighan-Helsgaun algorithm, so that the traveling salesman solving result is ensured to take 2 substations as a starting point and an ending point. The method for distributing the solving result along the road network is to map 2 substations and switch stations into the road network graph structure by taking the road network graph structure as basic data, so that road nodes required to pass through along the road network are obtained based on a graph algorithm.
(3) Considering that there may be a plurality of ring network lines passing through different switchboards between 2 substations, the rule (2) is only applicable to the case that there is only one ring network line between 2 substations, so all the distribution transformers are divided into different outgoing line levels, only one ring network line between any 2 substations in each outgoing line level is defined, and based on such an outgoing line level structure, a plurality of ring network lines passing through different switchboards can be allowed to exist between 2 substations.
In one embodiment, the objective function of the distribution network medium voltage line planning model is shown in formula (1):
wherein C is f Representing a flat fee; c (C) v Representing a variable cost as a function of line length, proportional to line length; r is the discount rate; m is depreciation age; c (C) l Annual cost for estimated network loss; c is the total cost, representing the sum of annual investment costs and annual operating costs for the planning level, minimizing the total cost to satisfy the economic principles.
The power distribution network is used as the last kilometer of service users, has a complex structure and a large number, and needs to be matched with each service department when analyzing the synchronous line loss, in particular to be fused with planning service. Because the grid planning of the power distribution network is related to the technical line loss of the power distribution system, the invention mainly considers the fusion process of the grid planning of the power distribution network and the line loss service, and optimizes the planning on the basis of considering the traditional planning cost and simultaneously considers the line loss cost, thereby realizing the goal of reducing the comprehensive cost.
Specifically, annual cost of network loss C l The estimated expression of (2) is as follows:
wherein N is W To the total number of the wire-out layers, N S For the total number of the upper-level power transformation stations, N T For the total number of distribution transformer, w, t and s are the numbers of the outlet level, distribution transformer and upper-level transformer stations respectively, and beta 1 Is the local electricity price; beta 2 Is the resistance of the medium voltage line per kilometer; beta 3 Is the annual loss of line hours, U l Is the three-phase line voltage;P t the power factor and the load forecast value of the distribution transformer t are respectively; />The shortest network length between the distribution transformer t and the upper-level transformer station s; />Is an integer decision variable of 0-1, and represents whether the distribution transformer t and the upper-level transformer station s have a connection relation in the w-th outlet level.
Specifically, the total cost of the line length C v The estimated expression of (2) is shown in the formula (3):
in the method, in the process of the invention,is a combined symbol, representing a symbol from N S The total number of combinations of 2 individuals among the individuals, here representing N S The number of ring network lines which can be obtained by combining every two transformer substations; k (K) l Representing a line cost factor; />Is a positive real continuous decision variable representing the effective shortest net length of line l in the w-th outlet level; />Is a 0-1 integer decision variable representing whether line l is present in the w-th wire-out level.
And leading out the main lines from different substations or different buses of the same substation to form a looped network, and adopting a closed-loop design and an open-loop operation mode. The double-ring net rack structure can meet the requirement of N-1-1, has relatively high investment and recommends the configuration of a load-intensive area.
The planning scheme in the embodiment of the invention can adopt a ring network wiring mode, and N-1 constraint is not needed to be considered because the ring network structure itself meets the line N-1 test. And assuming that the capacity of the upper-level substation is sufficient, the capacity of each line is sufficient. Based on the above simplified method, the constraint conditions of the mathematical model of the medium-voltage line route selection planning of the power distribution network need to consider the following constraints:
(1) The distribution transformer belongs to a line relation constraint as shown in a formula (4):
in the method, in the process of the invention,indicating whether the distribution transformer t belongs to a line l in the w-th outlet level, and is an integer variable of 0-1; s is(s) l1 Sum s l2 Respectively representing the start-up level substation and the end-up level substation of line l, +.> Is an integer decision variable of 0-1, and represents whether the distribution transformer t is respectively connected with the upper-level transformer station s in the w-th outlet level l1 Sum s l2 There is a connection relationship.
Distribution transformer (abbreviated as distribution transformer) equipment is an important node for power transmission to users, and the running state of the distribution transformer equipment largely determines the power supply quality and safety in an area. If the distribution transformer is in a heavy load or overload state for a long time, on one hand, the service life of equipment can be reduced, and on the other hand, line faults can be caused.
The role of the constraint of the line relation of the distribution transformer is to calculate whether the distribution transformer belongs to the line between the 2 upper-level transformer stations according to the connection relation of each distribution transformer and the 2 upper-level transformer stations.
(2) Line validity and minimum constraints, as shown in equation (5):
in the method, in the process of the invention,the legal network length of the line l passing through p switchyard in the w-th outlet level is a positive real continuous variable; l (L) lp Representing the actual road network length of the line i through the p switchyard; />Representing a set of switchyard elements included in a line l passing through p switchyards, which is obtained based on an improved travel quotient algorithm; f (f) OR (. Cndot.) and f MIN (. Cndot.) is a logical operation function representing a logical OR and a minimum, respectively; />Representing all the distribution transformer sets contained in the kth switching station; m is M Big And M Small Respectively represent a constant which is very large and near 0, N K For the total number of switchyard.
The effect of the line validity and minimum constraint is to perform validity check on each possible line between two substations, and only when at least one distribution transformer exists in each switching station through which the line passes and none of the non-passing switching stations belongs to the line, the validity check is performed so as to avoid the phenomenon that the distribution transformer is connected with an illegal line across the switching stations.
For a line passing the validity check, the length of the road network is the actual length of the road network; for the line which does not pass the validity check, the length of the road network is increased by M based on the actual length of the road network Big . Thus, the constraint is derived from all lines that pass the validity checkAnd (3) concentrating, namely obtaining the shortest road network length, namely obtaining the legal road network length of the line l between the 2 superior transformer stations, and calculating the cost of the line length.
(3) Line presence constraints, as shown in equation (6):
in the method, in the process of the invention,is a 0-1 integer decision variable representing whether line l is present in the w-th wire-out level.
The role of the line existence constraint is to traverse the line relation of all distribution transformers and acquire whether a line I between two upper-level transformer stations exists or not for calculating the line cost.
(4) The total number constraint of the line access distribution transformer is shown as a formula (7):
in the method, in the process of the invention,the number of distribution transformer users which are accessed to one ring network line at most is represented. This constraint is used to avoid the problem of "hanging lantern" on the line while guaranteeing a sufficient line capacity.
It should be noted that the problem of "hanging up the lantern" refers to the problem of potential safety hazard caused by a large number of access single distribution transformers within a short distance of the main line.
(5) The distribution transformer is constrained by network access, as shown in formula (8):
the meaning of this constraint is to ensure that each distribution transformer can access and only 1 line.
(6) The upper-level substation network access constraint is as shown in a formula (9):
is an integer decision variable of 0-1, and represents whether the distribution transformer t and the upper-level transformer station s have a connection relation in the w-th outlet level.
The upper-level substation network access constraint is used for guaranteeing that each upper-level substation and at least 1 distribution substation form a connection relation.
And solving the medium-voltage line selection planning mathematical model of the power distribution network taking the road network factors into consideration by adopting a Gurobi solver, so that a wiring scheme of the medium-voltage line of the power distribution network can be generated.
The medium-voltage line planning method for the power distribution network, which is provided by the embodiment of the invention, is a medium-voltage line planning method for the power distribution network, which takes road network factors into consideration, and can generate a wiring scheme of the medium-voltage line of the power distribution network which meets the optimal economical efficiency.
According to the medium-voltage line planning method for the power distribution network, when the medium-voltage line planning model of the power distribution network with the optimal economical efficiency as a target is constructed, basic data such as the distribution condition of the switching stations of the power distribution network, the distribution condition of the road network, the load prediction value and the like are fully considered, and the reliability and the safety of a medium-voltage line wiring scheme of the power distribution network can be ensured by preset constraint conditions. According to the invention, the solver is utilized to solve the medium-voltage line planning model of the distribution network, so that an optimal medium-voltage line wiring scheme of the distribution network with minimum total cost can be automatically generated, and the efficiency of medium-voltage distribution network line planning work is greatly improved; the obtained medium-voltage line planning result of the power distribution network ensures the power supply reliability as far as possible under the condition of ensuring the minimum total cost of line planning, and can ensure the safe and stable operation of the power system.
Referring to fig. 2, a second embodiment of a medium voltage circuit planning method for a power distribution network according to the present invention includes:
according to the distribution of the switch stations and the distribution situation of the road network, taking the optimal economical efficiency as a target, and establishing a medium-voltage line planning model of the power distribution network taking the road network factors into consideration;
and solving a planning model of the medium-voltage circuit of the power distribution network taking road network factors into consideration by adopting a Gurobi solver, and automatically generating a wiring scheme of the medium-voltage circuit.
The following is an actual planning case analysis of the present invention:
taking a distribution transformer area in a certain area as an example, carrying out medium-voltage line selection planning of a power distribution network, wherein space load data is derived from a SMART-DS open source database, and comprises daily maximum load values of all terminal low-voltage users in the area from 2016 years to 2018 years, geographic information data of each electric power facility and road network, the affiliation of a distribution transformer and the terminal low-voltage users and the power factor of the terminal low-voltage users.
And establishing a medium-voltage line planning model of the power distribution network according to the data of the switching station and the road network, and optimizing medium-voltage line selection in the area, wherein the flow is as follows:
(1) And calculating basic data required by medium-voltage line selection of the power distribution network. The required basic data mainly comprise distribution conditions of power facilities such as each distribution transformer, an upper-level substation and the like, geographic information data of a road network, and power factors and load predicted values of each distribution transformer. In this embodiment, the planned area contains 792 distribution transformers, 4 upper-level transformer stations, and a fixed line investment C f Taking 100000 yuan, the line cost coefficient K l Taking 200 yuan/km, the discount rate r taking 0.05, the depreciation period m taking 1, and the local electricity price beta 1 Taking the resistance beta of each kilometer of a medium-voltage circuit of 0.5 yuan/kWh 2 Taking 0.45 omega/km, and annual loss of line for hours 3 Taking 3600h, three-phase line voltage U l 12.47kV was taken.
(2) And establishing a mathematical model of medium-voltage line selection planning of the power distribution network, namely a planning model of the medium-voltage line of the power distribution network, and solving to obtain a medium-voltage line selection scheme. In this embodiment, the total number of outgoing line levels is 3, so that at most 3 ring network lines exist between 2 substations. And finally, carrying out mixed integer linear programming solution by using a Gurobi business solver to obtain a medium-voltage line selection scheme of the power distribution network considering road network factors.
According to the medium-voltage circuit line selection scheme of the power distribution network, 8 medium-voltage circuits are generated, so that 4 superior power transformation stations transmit electric energy to 30 switching stations, and the 30 switching stations redistribute the electric energy to 792 distribution transformers. The geographical distribution of the 4 upper-level transformer stations, the 8 medium-voltage lines and the 30 switching stations is shown in fig. 3 to 10. The connection relationship between each feeder line and the upper-level substation and the switching station is also shown in fig. 3 to 10. As can be seen from fig. 3 to 10, each ring feeder follows the basic principle of near-backup power supply and forms the shortest line length along the network as much as possible. For a switching station with dense load, a plurality of feeder lines are used for supplying power to the switching station, so that the economical efficiency is improved, and meanwhile, the power supply reliability is guaranteed. In addition, the power supply reliability is guaranteed as much as possible under the condition that the line length cost is guaranteed to be minimum by the line planning result: the planning scheme totally adopts a ring network wiring mode, and can be checked through an upper-level substation and a line N-1; 2.3 feeder lines from 2.5 upper-level power transformation stations are input into each switching station on average, so that part of the upper-level power transformation stations and lines can pass through N-1 verification and N-2 verification; each upper-level substation has a communication relation with 2.5 other upper-level substations on average, and the communication rate of the upper-level substations in the area reaches 100 percent; 4 wires are evenly led out from each upper-level substation, and a larger growth space exists; each feeder line is averagely connected with 8.6 stations of the switching station and 99 stations of the distribution transformer; each looped network feeder line has an average line length of 19.9km from one superordinate substation to another superordinate substation. The result verifies the rationality of the medium-voltage line planning of the power distribution network.
Referring to fig. 11, a medium voltage line planning apparatus for a power distribution network according to an embodiment of the present invention includes:
the model construction module 11 is configured to construct a distribution network medium voltage line planning model that aims at minimizing the total cost of the distribution network medium voltage line planning according to the basic data of the distribution network and the preset constraint condition;
the basic data at least comprises distribution data and load prediction values of a distribution transformer, an upper-level substation and a road network; the preset constraint conditions at least comprise line relation constraint, line legality and minimum constraint, line existence constraint, line access distribution total constraint, distribution network constraint and upper-level substation network constraint of distribution transformers;
and the model solving module 22 is used for solving the medium voltage line planning model of the distribution network by utilizing a solver to obtain an optimal medium voltage line wiring scheme of the distribution network.
According to the medium-voltage line planning device for the power distribution network, when the medium-voltage line planning model of the power distribution network with the optimal economical efficiency as a target is constructed, basic data such as the distribution condition of the switching stations of the power distribution network, the distribution condition of the road network, the predicted value of the load and the like are fully considered, and the reliability and the safety of a medium-voltage line wiring scheme of the power distribution network can be ensured by preset constraint conditions. According to the invention, the solver is utilized to solve the medium-voltage line planning model of the distribution network, so that an optimal medium-voltage line wiring scheme of the distribution network with minimum total cost can be automatically generated, and the efficiency of medium-voltage distribution network line planning work is greatly improved; the obtained medium-voltage line planning result of the power distribution network ensures the power supply reliability as far as possible under the condition of ensuring the minimum total cost of line planning, and can ensure the safe and stable operation of the power system.
In addition, the invention also provides electronic equipment, which comprises: a processor and a memory;
wherein the memory stores a computer program, the processor implementing the steps of the method when executing the computer program.
The invention also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the steps of the method.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A medium voltage circuit planning method for a power distribution network, comprising:
constructing a distribution network medium voltage line planning model aiming at minimizing the total cost of the distribution network medium voltage line planning according to the basic data of the distribution network and preset constraint conditions;
the basic data at least comprises distribution data and load prediction values of a distribution transformer, an upper-level substation and a road network; the preset constraint conditions at least comprise line relation constraint, line legality and minimum constraint, line existence constraint, line access distribution total constraint, distribution network constraint and upper-level substation network constraint of distribution transformers;
and solving the medium voltage line planning model of the distribution network by using a solver to obtain an optimal medium voltage line wiring scheme of the distribution network.
2. The medium voltage line planning method of a power distribution network according to claim 1, wherein the objective function of the medium voltage line planning model of the power distribution network is:
wherein C is f Representing a flat fee; c (C) v Representing variable cost as a function of line length, and lineThe path length is proportional; r is the discount rate; m is depreciation age; c (C) l Annual cost for estimated network loss; and C is the total cost of power distribution network line planning, and represents the sum of annual investment cost and annual operating cost of the planning level.
3. The method for planning a medium voltage line of a power distribution network according to claim 1, wherein the constructing a medium voltage line planning model of the power distribution network aiming at minimizing the total cost of the medium voltage line planning of the power distribution network further comprises:
determining two upper-level transformer stations connected with each distribution transformer in the power distribution network;
acquiring all switch stations to which all distribution transformers connected with the same two substations belong, and determining road nodes required to pass through by the looped network lines distributed along a road network when only one looped network line exists between the two substations; the looped network line is a shortest path which is distributed along a road network and passes through each switching station;
when a plurality of looped network lines passing through different switch stations exist between the two substations, all distribution transformers are divided into a plurality of outgoing line levels, only one looped network line exists between the two substations in each outgoing line level, and road nodes which need to be passed through by the looped network lines corresponding to each outgoing line level are distributed along a road network.
4. A medium voltage line planning method of a power distribution network according to claim 3, wherein said determining the road nodes through which the ring network line needs to pass along the road network distribution comprises:
acquiring all switch stations to which all distribution transformers connected with the same two substations belong;
taking the two substations as a starting point and an ending point respectively, and solving the shortest path which is distributed along a road network and passes through each switching station based on an improved travel business algorithm;
and taking the shortest path as a looped network line of the two substations, wherein the road nodes on the shortest path are road nodes which the looped network line needs to pass through when distributed along a road network.
5. The medium voltage line planning method of a power distribution network according to claim 1, wherein the line relation constraint of the distribution transformer is:
in the method, in the process of the invention,indicating whether the distribution transformer t belongs to a line l in the w-th outlet level, and is an integer variable of 0-1; s is(s) l1 Sum s l2 Respectively representing the start-up level substation and the end-up level substation of line l, +.> Is an integer decision variable of 0-1, and represents whether the distribution transformer t is respectively connected with the upper-level transformer station s in the w-th outlet level l1 Sum s l2 There is a connection relationship.
6. A medium voltage line planning method of a power distribution network according to claim 1, characterized in that the line legality and minimum constraints are:
in the method, in the process of the invention,the legal network length of the line l passing through p switchyard in the w-th outlet level is a positive real continuous variable; l (L) lp Representing the passage through p switchyardsThe actual road network length of line l; />Representing a set of switchyard elements included in a line l passing through p switchyards, which is obtained based on an improved travel quotient algorithm; f (f) OR (. Cndot.) and f MIN (. Cndot.) is a logical operation function representing a logical OR and a minimum, respectively; />Representing all the distribution transformer sets contained in the kth switching station; m is M Big And M Small Representing a large and nearly 0 constant, respectively.
7. The medium voltage line planning method of a power distribution network according to claim 1, wherein the upper level substation access constraint is:
wherein N is W For the total number of the outgoing line levels, w are the numbers of the outgoing line levels, t is the number of the distribution transformer, N T In order to make up the total number of the variations,is an integer decision variable of 0-1, and represents whether the distribution transformer t and the upper-level transformer station s have a connection relation in the w-th outlet level.
8. A medium voltage line planning apparatus for a power distribution network, comprising:
the model construction module is used for constructing a distribution network medium-voltage line planning model aiming at minimizing the total cost of the distribution network medium-voltage line planning according to the basic data of the distribution network and preset constraint conditions;
the basic data at least comprises distribution data and load prediction values of a distribution transformer, an upper-level substation and a road network; the preset constraint conditions at least comprise line relation constraint, line legality and minimum constraint, line existence constraint, line access distribution total constraint, distribution network constraint and upper-level substation network constraint of distribution transformers;
and the model solving module is used for solving the medium voltage line planning model of the distribution network by utilizing a solver to obtain an optimal medium voltage line wiring scheme of the distribution network.
9. An electronic device, comprising: a processor and a memory;
wherein the memory stores a computer program, which when executed by the processor implements the steps of the method according to any one of claims 1 to 7.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.
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