CN111724025A - High-voltage distribution network frame planning method based on power supply unit optimized division - Google Patents
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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: step S1, data collection is carried out on the area to be planned; step S2, carrying out power supply unit optimization division according to the acquired data of the region to be planned; step S3, planning the target net rack for the power supply units which are optimally divided and electrically independent to each other to obtain a target net rack wiring scheme; and step 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 the above, the present invention aims to provide a high voltage distribution network frame planning method based on power supply unit optimized partitioning, which divides a planning area into a small area and a complex area by optimizing the power supply unit, so that the network frame planning realizes technical safety in each power supply unit with mutually independent electricity, and improves planning efficiency.
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:
step S1, data collection is carried out on the area to be planned;
step S2, carrying out power supply unit optimization division according to the acquired data of the region to be planned;
step S3, planning the target net rack for the power supply units which are optimally divided and electrically independent to each other to obtain a target net rack wiring scheme;
and step S4, constructing a transition net rack wiring scheme according to the obtained target net rack wiring scheme.
Further, the data collection includes checking the current situation, planning feasible trunk channel resources, distribution and outlet of 220-plus-110 kV power supplies, load development conditions and construction maturity conditions of the planning area.
Further, the step S2 is specifically:
step 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;
step S22, determining a standby power supply according to the principle of minimum cost 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;
and S23, checking the adaptability of the 110kV transformer substation 10kV outgoing line interval, the transformer capacity and the 10kV channel resource pair-low voltage target grid frame construction 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, excluding 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 fn＝Ngk(1)
wherein N isgkThe 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 ofgk、Nzk、NdkThe 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 respectivelyCThe cost of investment for the 110kV transformer substation contact line in the power supply unit; mgk,i,Mzk,i,Mdk,iThe power supply units are respectively corresponding to the ith chain type, ring network and radiation connection; v. ofh_i,sh_i,lh_iThe 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. ofm_i,sm_i,lm_iThe 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 coordinating 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 division 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:
step S1, data collection is carried out on the area to be planned; the method comprises the steps of checking the current situation, planning feasible trunk channel resources, distribution and outlet of 220-plus-110 kV power supplies, load development conditions and planning area construction maturity conditions;
step S2, carrying out power supply unit optimization division according to the acquired data of the region to be planned;
step S3, planning the target net rack for the power supply units which are optimally divided and electrically independent to each other to obtain a target net rack wiring scheme;
and step 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:
step 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;
step S22, determining a standby power supply according to the principle of minimum cost 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;
and S23, checking the adaptability of the 110kV transformer substation 10kV outgoing line interval, the transformer capacity and the 10kV channel resource pair-low voltage target grid frame construction 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, excluding 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 fn＝Ngk(1)
the formula (1) represents that the division of the power supply units follows technical safety, the power supply units with high reliability and chain connection are formed in the power supply units as much as possible, and Ngk represents the number of the power supply units with chain connection in the typical connection mode of a high-voltage distribution network in the power supply units;
and (2) the power supply unit determines the standby power supply by taking the minimum cost of the communication line cost as an objective function. The Ngk, the Nzk and the Ndk are respectively the number of power supply units of which the typical wiring modes of a high-voltage distribution network in the power supply units are chain type, ring network and radiation wiring, and the IC is the investment cost of a 110kV transformer substation contact line in the power supply units, and comprises line planning cost, line body investment cost, civil engineering cost and the like;
and (3) the adaptability of the 110kV transformer substation 10kV outgoing line interval, the transformer capacity and the construction of the 10kV channel resources to the medium-low voltage target network frame in the power supply unit is checked, and the power supply unit which does not meet the coordination requirements of the upper and lower power grids is excluded. Mgk,i,Mzk,i,Mdk,iThe power supply units are respectively corresponding to the ith chain type, ring network and radiation connection; v. ofh_i,sh_i,lh_iThe 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. ofm_i,sm_i,lm_iThe 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 isoper(Mgk,i,Mzk,i,Mdk,i) The operation constraint condition of the high-voltage distribution network under the conditions of normal operation and N-1 is less than or equal to 0, and relates to the constraints of voltage, power, short-circuit current and the like; f. offlow(Mgk,i,Mzk,i,Mdk,i) 0 is the constraint condition of the power flow operation equation of the high-voltage distribution network under the normal operation and the N-1 condition; f. ofhigh(vh_i,sh_i,lh_i)≥fmiddle(vm_i,sm_i,lm_i) Variable capacitance constructed for checking target net rack of medium-low voltage power grid of high-voltage power distribution networkThe outlet interval and the main channel resource requirement, and the resource of the high-voltage distribution network is only greater than or equal to the requirement 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 modes recommended by different Power supply regions
2) The high-voltage distribution network line construction type is the construction type recommended in the following table 2 according to the power supply area;
TABLE 2 recommended route construction patterns for 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 is 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 rate of the power grid, the power supply reliability of the power grid, the power supply quality and the like. The economic comparison and selection is carried out on the cost of the communication line between stations, the construction cost of a line conductor, the switching cost, the failure power failure loss cost and the electric energy loss cost 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: the method comprises the following steps that a transitional net rack wiring mode in each power supply area is used for comprehensively allocating transformer substation interval resources according to a power grid development stage and a transformer substation construction time sequence according to equipment waste, and a differential transitional wiring scheme is made;
as shown in fig. 2, is a proposed transition wiring scheme. Any wiring can form looped network, dual supply chain connection by single radiation, and the two T of two side power, three T wiring forms carry out differentiation selection according to transformer substation owner transformer station number, and some wiring can suitably be omitted, for example dual 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 frame of 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 after status analysis, load prediction and power balance, 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 1700 MW.
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 the 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 source and the standby power supply source 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 adaptability of the current grid structure, the power grid development maturity, the load development condition check unit inner power transformation capacity and load development requirements and the outlet interval resource and the lower stage target grid structure, excluding the power supply unit which does not meet the coordinated development of the upper and lower stages of power grids. The power supply units divided by the embodiment can meet the requirements of the medium-voltage target network frame construction 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) The transition net rack planning is carried out according to the graph 2, wherein part of the connection wires can be properly omitted, and the transition to the target net rack can be carried out at one time.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (7)
1. A high-voltage distribution network frame planning method based on power supply unit optimization division is characterized by comprising the following steps:
step S1, data collection is carried out on the area to be planned;
step S2, carrying out power supply unit optimization division according to the acquired data of the region to be planned;
step S3, planning the target net rack for the power supply units which are optimally divided and electrically independent to each other to obtain a target net rack wiring scheme;
and step S4, constructing a transition net rack wiring scheme according to the obtained target net rack wiring scheme.
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 distribution and outlet of 220-plus-110 kV 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 step S2 specifically includes:
step 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;
step S22, determining a standby power supply according to the principle of minimum cost 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;
and S23, checking the adaptability of the 110kV transformer substation 10kV outgoing line interval, the transformer capacity and the 10kV channel resource pair-low voltage target grid frame construction 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, excluding the selected standby power supply, returning to the step S22, and otherwise, determining the division of the power supply units.
4. The power supply unit optimization division-based high-voltage distribution network frame planning method according to claim 3, wherein the optimization model specifically comprises:
max fn＝Ngk(1)
wherein N isgkThe 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 ofgk、Nzk、NdkThe 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 respectivelyC_gk,i、IC_zk,i、IC_dk,iThe 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; mgk,i,Mzk,i,Mdk,iThe power supply units are respectively corresponding to the ith chain type, ring network and radiation connection; v. ofh_i,sh_i,lh_iThe 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. ofm_i,sm_i,lm_iThe 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.
5. 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.
6. The power supply unit optimization division-based grid planning method for the high-voltage distribution network according to claim 1, wherein the step S4 is based on a target grid connection scheme, and a differentiated transition grid connection scheme is formulated according to a power grid development stage, according to equipment utilization and overall substation interval resource allocation according to a substation construction time sequence.
7. A high-voltage distribution network planning system based on power supply unit optimization division is characterized by comprising a memory and a processor, wherein the memory is stored with a computer program, and the processor can realize the method steps of any one of claims 1-6 when running the computer program.
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| CN112231811A (en) * | 2020-10-15 | 2021-01-15 | 国网河北省电力有限公司雄安新区供电公司 | BIM-based urban medium-voltage distribution network transition net rack transformation method |
| CN112598324A (en) * | 2020-12-31 | 2021-04-02 | 国网河北省电力有限公司经济技术研究院 | Receiving end main network frame planning method and terminal equipment |
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