CN111724025B - High-voltage distribution network frame planning method based on power supply unit optimized division - Google Patents
High-voltage distribution network frame planning method based on power supply unit optimized division Download PDFInfo
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Abstract
The invention relates to a high-voltage distribution network frame planning method based on power supply unit optimization division, which comprises the following steps: s1, performing data collection on a region to be planned; s2, carrying out power supply unit optimization division according to the acquired data of the region to be planned; s3, planning a target net rack for the power supply units which are optimally divided and are electrically independent to each other to obtain a target net rack wiring scheme; and S4, constructing a transition net rack wiring scheme according to the obtained target net rack wiring scheme. According to the invention, through optimizing and dividing the power supply units, the planning area is enlarged and simplified, so that the technical safety of the grid planning is realized in each power supply unit with mutually independent electricity, and the planning efficiency is improved.
Description
Technical Field
The invention relates to the field of high-voltage distribution network frame planning, in particular to a high-voltage distribution network frame planning method based on power supply unit optimization division.
Background
Under the background of new power generation, the fine planning of the power grid is the key for improving the efficiency benefit level of enterprises, realizing the technical safety and improving the efficiency. The traditional power distribution network planning mainly meets the recent load increase demand, and the problems of insufficient power distribution network construction, operation standardization, poor operation efficiency, poor technical safety level, poor enterprise operation benefit and the like are caused by the lack of a distant target planning guide and an consistent planning concept and technical route.
The reasonable division of power supply units is a key problem in power distribution network planning. Although power supply enterprises set up relevant power supply unit division principles, such as requiring power supply units to be bounded by geographical barriers such as trunk roads, rivers or hills, in specific planning practice, power supply unit division still mainly depends on subjective experiences of planners. Because the power supply unit division relates to the improvement of various indexes such as power supply capacity of a power grid, a grid structure, power supply quality and the like, the requirements on technical economy and technical rationality are difficult to meet in practice only by the subjective experience of planners or general technical principles.
Disclosure of Invention
In view of this, the present invention aims to provide a high voltage distribution network frame planning method based on power supply unit optimized partitioning, which divides the planning area into large and small areas and simplifies the planning area by optimizing the partitioning of the power supply units, so that the network frame planning realizes technical safety in each power supply unit with mutually independent electricity, and the planning efficiency is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-voltage distribution network frame planning method based on power supply unit optimization division comprises the following steps:
s1, performing data collection on a region to be planned;
s2, carrying out power supply unit optimization division according to the acquired data of the region to be planned;
s3, planning a target net rack for the power supply units which are optimally divided and are electrically independent to each other to obtain a target net rack wiring scheme;
and S4, constructing a transition net rack wiring scheme according to the obtained target net rack wiring scheme.
Furthermore, the data collection comprises the current situation of investigation, the planning of feasible trunk channel resources, the point distribution and outgoing of 220-110kV power supplies, the load development condition and the planning area construction maturity condition.
Further, the step S2 specifically includes:
s21, acquiring a main power supply source and a standby power supply source set of the 110kV transformer substation, wherein the main power supply source is unique and determined, and the standby power supply source has a plurality of power supply ratio options;
s22, determining a standby power supply according to the minimum cost principle of the communication line, and dividing 4-6 110kV substations of which the main power supply and the standby power supply are the same or opposite into a power supply unit;
and S23, checking the adaptability of the 10kV outgoing line interval, the transformation capacity and the construction of the 10kV channel resource middle-low voltage target grid frame of the 110kV transformer substation in the divided power supply units according to the optimization model, if the power supply units which do not meet the coordination requirements of the upper and lower levels of power grids exist, eliminating the selected standby power supply, returning to the step S22, and otherwise, determining the division of the power supply units.
Further, the optimization model specifically includes:
max f n ＝N gk (1)
wherein N is gk The number of the power supply units is represented, wherein the typical wiring mode of a high-voltage distribution network in the power supply units is chain wiring; n is a radical of gk 、N zk 、N dk The number of power supply units, I, of which the typical wiring modes of the high-voltage distribution network in the power supply units are chain type, ring network and radiation wiring respectively C The cost of investment for the 110kV transformer substation contact line in the power supply unit; m is a group of gk,i ,M zk,i ,M dk,i The power supply units are respectively corresponding to the ith chain type, ring network and radiation connection; v. of h_i ,s h_i ,l h_i The method comprises the steps of obtaining the transformation capacity of the ith power supply unit of the high-voltage distribution network, the 10kV outgoing line interval residual condition and the 10kV trunk channel resource condition; v. of m_i ,s m_i ,l m_i The power transformation capacity, 10kV outgoing line interval and 10kV line channel resources required by the medium and low voltage distribution network corresponding to the ith power supply unit of the high voltage distribution network.
Further, the target net rack planning comprises an initial net rack wiring scheme, a line construction mode and a final net rack wiring scheme.
Further, step S4 is based on the target grid connection scheme, and according to the power grid development stage, the differentiated transition grid connection scheme is formulated by following the equipment utilization and planning the transformer substation interval resource allocation according to the transformer substation construction time sequence.
A high-voltage distribution network planning system based on power supply unit optimization division comprises a memory and a processor, wherein the memory is stored with a computer program, and the processor can realize the method steps as claimed in any one of claims 1 to 6 when running the computer program.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, through optimizing and dividing the power supply units, the planning area is enlarged and simplified, so that the technical safety of the grid planning is realized in each power supply unit with mutually independent electricity, and the planning efficiency is improved.
Drawings
FIG. 1 is a flow chart illustrating the optimized partitioning of power supply units according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a recommended connection method for a transition net rack according to an embodiment of the present invention;
FIG. 3 is a distribution of substation sites in area A according to an embodiment of the present invention;
FIG. 4 shows the optimized partition result and wiring pattern of the power supply unit in zone A according to an embodiment of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
In this embodiment, a high voltage distribution network frame planning system based on power supply unit optimized partitioning is provided, which includes a memory and a processor, where the memory stores a computer program, and the processor can implement the following method steps when running the computer program.
Referring to fig. 1, the invention provides a high voltage distribution network frame planning method based on power supply unit optimization division, which comprises the following steps:
s1, performing data collection on a to-be-planned area; the method comprises the steps of checking the current situation, planning feasible trunk channel resources, 220-110kV power distribution and outlet, load development condition and planning area construction maturity condition;
s2, carrying out power supply unit optimization division according to the acquired data of the region to be planned;
s3, planning a target net rack for the power supply units which are optimally divided and are electrically independent to each other to obtain a target net rack wiring scheme;
and S4, constructing a transition net rack wiring scheme according to the obtained target net rack wiring scheme.
In this embodiment, the step S2 specifically includes:
s21, acquiring a main power supply and a standby power supply set of the 110kV transformer substation, wherein the main power supply is unique and definite, and the standby power supply has a plurality of power supply options;
s22, determining a standby power supply according to the minimum cost principle of the communication line, and dividing 4-6 110kV substations of which the main power supply and the standby power supply are the same or opposite into a power supply unit;
and S23, checking the adaptability of the 110kV transformer substation 10kV outgoing line interval, the transformer capacity and the 10kV channel resource to the construction of the medium-low voltage target network frame in the divided power supply units according to the optimization model, if the power supply units which do not meet the coordination requirements of the upper and lower power grids exist, removing the selected standby power supply, returning to the step S22, and otherwise, determining the division of the power supply units.
In this embodiment, the optimization model specifically includes:
max f n ＝N gk (1)
the method comprises the following steps that (1) a power supply unit is divided according to technical safety, high-reliability power supply units with chain connection are formed in the power supply unit as much as possible, and Ngk represents the number of the power supply units with the chain connection in a typical connection mode of a high-voltage distribution network in the power supply unit;
and (2) the power supply unit determines the standby power supply by taking the cost of the contact line as a target function. The Ngk, nzk and Ndk are the number of power supply units with chain type, ring network and radiation wiring typical wiring modes of a high-voltage distribution network in the power supply unit respectively, and the IC is the investment cost of a 110kV transformer substation contact line in the power supply unit, and comprises line planning cost, line body investment cost, civil engineering cost and the like;
and (3) checking the adaptability of the 110kV transformer substation 10kV outgoing line interval, the transformation capacity and the 10kV channel resource to the construction of the medium-low voltage target grid frame in the power supply unit, and excluding the power supply units which do not meet the coordination requirements of the upper-level power grid and the lower-level power grid. M gk,i ,M zk,i ,M dk,i The power supply units are respectively corresponding to the ith chain type, ring network and radiation connection; v. of h_i ,s h_i ,l h_i The method comprises the steps of obtaining the transformation capacity of the ith power supply unit of the high-voltage distribution network, the 10kV outgoing line interval residual condition and the 10kV trunk channel resource condition; v. of m_i ,s m_i ,l m_i The power transformation capacity, 10kV outgoing line interval and 10kV line channel resources required by the medium and low voltage distribution network corresponding to the ith power supply unit of the high voltage distribution network.
Wherein f is oper (M gk,i ,M zk,i ,M dk,i ) The operation constraint condition of the high-voltage distribution network under the conditions of normal operation and N-1 is not more than 0, and relates to constraints such as voltage, power, short-circuit current and the like; f. of flow (M gk,i ,M zk,i ,M dk,i ) =0 is the constraint condition of the power flow operation equation of the high-voltage distribution network under normal operation and N-1 condition; f. of high (v h_i ,s h_i ,l h_i )≥f middle (v m_i ,s m_i ,l m_ i) In order to check the adaptability of the high-voltage distribution network to the requirements of the medium-low voltage power grid target network frame on the variable capacitance, the outgoing line interval and the main channel resources, the resources of the high-voltage distribution network only need to be more than or equal to the requirements of the medium-low voltage distribution network.
In this embodiment, the target rack planning includes an initial rack wiring scheme, a route construction pattern, and a final rack wiring scheme.
1) The initial net rack wiring of the high-voltage distribution network has a wiring mode recommended by the attached table 1 according to the type of a power supply area;
TABLE 1 high-voltage wiring mode recommended for different power supply areas
2) The high-voltage distribution network line construction pattern is as recommended in the following table 2 according to the power supply area;
TABLE 2 line construction types recommended by different power supply areas
3) Final wiring scheme of the high-voltage distribution network: and carrying out technical-economic comparison and selection on the initial wiring scheme, and selecting a scheme with the optimal equipment cost as a final wiring scheme under the condition of meeting the requirement of a power supply safety criterion.
The technical comparison and selection are carried out from the aspects of the capacity-load ratio of a 110kV power grid, the operation efficiency of power grid equipment, the N-1 ratio of the power grid, the power supply reliability of the power grid, the power supply quality and the like. The economic ratio is developed from the cost aspect of the cost of the contact line between stations, the construction cost of a line conductor, the switching cost, the cost of the fault power failure loss and the cost of the electric energy loss are calculated, and the scheme with the optimal economical efficiency is selected as the final scheme.
In this embodiment, preferably, a transition net rack wiring scheme is reasonably established according to the determined target net rack wiring: according to the power grid development stage, the wiring mode of the transition net racks in each power supply area conforms to equipment utilization and overall substation interval resource distribution according to the substation construction time sequence, and a differential transition wiring scheme is made;
as shown in fig. 2, is a proposed transition wiring scheme. Any wiring can form looped network, duplicate supply chain connection by single radiation, the double T of two side power, three T wiring form carry out differentiation according to the transformer substation owner and select, and some wiring can suitably be omitted, for example duplicate supply double T can directly pass through to three chain connection. The specific transition scheme is determined by combining construction capital, load development conditions and substation construction time sequences, and partial areas can be transited to the target net rack at one time.
Example 1:
in this embodiment, the planning of the high voltage distribution network rack in the area a is performed, and the power supply unit optimization division process is as follows:
1. planning zone data collection:
fig. 3 is a schematic diagram of distribution of substations obtained through status analysis, load prediction and power balancing, where the numbers of 220kV substations and 110kV substations are 7 and 18, respectively. The total power supply area of the area is 120km2 in the target year, and the maximum load is 1700MW.
2. Optimizing and dividing power supply units:
as shown in fig. 4, the area X (composed of 3 220kV substations and 8 110kV substations) in the red frame line is taken as an example, the power supply unit in this embodiment optimizes the division process, and the result of each step is detailed in the attached table 3.
Attached table 3 power supply unit optimization partitioning method process
Note: the symbol "|" demarcates different backup power supplies in the backup power supply set, e.g. { III } indicates backup power supply I and backup power supply III
(1) And searching a main power supply set and a standby power supply set of the 110kV transformer substation. The method comprises the steps of firstly determining main power supply points of 8 110kV substations in an area X, taking the power supply point closest to the main power supply point as the main power supply point, and then searching a possible standby power supply point set according to a power supply safety criterion. Because the transformer substations 6 and 7 lack upper-level standby power supply points, the transformer substations 6 and 7 are considered to form a ring network power supply unit, and the rest 6 110kV transformer substations can search a plurality of standby power supply sets. The main power supply of the transformer substation 0 is II, and the standby power supplies are I and III; the main power supply of the transformer substation 1 is I, and the standby power supplies are II and III; the main power supply source of the transformer substation 3 is III, and the standby power supply sources are I, II and IV; the main power supply of the transformer substation 4 is I, and the standby power supplies are III and IV;
(2) And then, determining a standby power supply source with the minimum cost of the contact line, taking the transformer substation 0 as an example, and when the standby power supply source is I, determining that the cost of the contact line from the transformer substation 0 to the standby power supply I is more than that of the standby power supply III, and determining that the standby power supply source of the transformer substation 0 is I. Likewise, the backup power supply of the substation 1 is determined to be ii. And the main power supply and the standby power supply of the transformer substations 0 and 1 are opposite, and the power supply area of the transformer substations 0 and 1 is determined to be a power supply unit.
(3) And according to the current grid structure, the power grid development maturity, the load development condition and the adaptability of the power transformation capacity and the load development requirement in the checking unit and the outlet interval resource to the construction of the next-level target grid, excluding the power supply unit which does not meet the coordinated development of the upper and lower-level power grids. The power supply units divided by the embodiment can meet the requirements of the medium-voltage target grid structure on interval resources and transformation capacity.
(4) According to the actual condition of a regional power grid, an initial wiring mode is determined according to an attached table 1, wherein T and pi of chain connection are determined through technical and economic comparison.
(5) Planning the transition net rack according to fig. 2, wherein part of the wiring can be omitted properly, and the transition can be made to the target net rack at one time.
The above description is only a preferred embodiment of the present invention, and all the equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.
Claims (4)
1. A high-voltage distribution network frame planning method based on power supply unit optimization division is characterized by comprising the following steps:
s1, performing data collection on a to-be-planned area;
s2, carrying out power supply unit optimization division according to the acquired data of the region to be planned;
s3, planning a target net rack for the power supply units which are optimally divided and are electrically independent to each other to obtain a target net rack wiring scheme;
s4, constructing a transition net rack wiring scheme according to the obtained target net rack wiring scheme; the step S2 specifically comprises the following steps:
s21, acquiring a main power supply source and a standby power supply source set of the 110kV transformer substation, wherein the main power supply source is unique and determined, and the standby power supply source has a plurality of power supply ratio options;
s22, determining a standby power supply according to the minimum cost principle of the communication line, and dividing 4-6 110kV transformer substations of which the main power supply and the standby power supply are the same or opposite into a power supply unit;
step S23, checking the adaptability of the construction scheme of the middle and low voltage target net racks in the 110kV transformer substation 10kV outgoing line interval, the transformer capacity and the 10kV channel resources in the divided power supply units according to the optimization model, if the power supply units which do not meet the coordination requirements of the upper and lower power grids exist, excluding the selected standby power supply, returning to the step S22, otherwise, determining the division of the power supply units; the optimization model specifically comprises the following steps:
maxf n ＝N gk (1)
wherein, N gk 、N zk 、N dk The number of power supply units, I, of which the typical wiring modes of the high-voltage distribution network in the power supply units are chain type, ring network and radiation wiring respectively C_gk,i 、I C_zk,i 、I C_dk,i The investment cost of 110kV transformer substation contact lines with typical wiring modes of chain type, ring network and radiation wiring in a high-voltage distribution network in a power supply unit is respectively saved; m gk,i ,M zk,i ,M dk,i The power supply units are respectively corresponding to the ith chain type, ring network and radiation connection; v. of h_i ,s h_i ,l h_i The power transformation capacity, 10kV outgoing line interval residual condition and 10kV main channel resource condition of the ith power supply unit of the high-voltage distribution network are obtained; v. of m_i ,s m_i ,l m_i The power transformation capacity, 10kV outgoing line interval and 10kV line channel resources required by the medium and low voltage distribution network corresponding to the ith power supply unit of the high voltage distribution network.
2. The power supply unit optimization division-based high-voltage distribution network frame planning method according to claim 1, characterized in that: the data collection comprises the current situation of investigation, the planning of main channel resources, the point distribution and outgoing of 220-110kV power supplies, the load development condition and the construction maturity condition of a planning area.
3. The power supply unit optimization division-based high-voltage distribution network rack planning method according to claim 1, wherein the target network rack planning comprises an initial network rack wiring scheme, a line construction scheme and a final network rack wiring scheme.
4. A planning system for a network frame of a high-voltage distribution network based on optimized division of power supply units is characterized by comprising a memory and a processor, wherein the memory stores a computer program, and the processor can realize the method steps of any one of claims 1 to 3 when running the computer program.
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