CN111952963A - Construction area power distribution network fine planning method - Google Patents
Construction area power distribution network fine planning method Download PDFInfo
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- CN111952963A CN111952963A CN202010755616.5A CN202010755616A CN111952963A CN 111952963 A CN111952963 A CN 111952963A CN 202010755616 A CN202010755616 A CN 202010755616A CN 111952963 A CN111952963 A CN 111952963A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The invention discloses a fine planning method for a power distribution network in a construction area, which comprises the following steps: the method comprises the steps of analyzing data, establishing main transformer interconnection, analyzing the power consumption condition and power consumption load of users, changing the segmentation range and address selection of a power grid according to the distribution of the users, judging the load rate, then taking the regional power supply capacity and saving the communication channels among the main transformers as basic starting points, establishing a main transformer interconnection model, calculating the communication capacity, optimizing the power grid, calculating the maximum power supply capacity of the network, transforming the existing medium-voltage network frame, establishing complete communication of pairwise interconnection, and sequentially deleting unreasonable interconnection relations to form a power supply framework consisting of reasonable interconnection relations; the defects of unscientific power grid line segmentation and low reliability of power distribution network operation are overcome, the power distribution network line is optimized, and the maximum power supply capacity of the power distribution network during operation is improved.
Description
Technical Field
The invention relates to a power distribution network fine planning method, in particular to a power distribution network fine planning method in a construction area, and belongs to the technical field of power distribution network application.
Background
The distribution network is an electric power network which receives electric energy from a transmission network or a regional power plant and distributes the electric energy to various users on site through distribution facilities or step by step according to voltage. The power distribution network is composed of overhead lines, cables, towers, distribution transformers, isolating switches, reactive power compensators, a plurality of accessory facilities and the like, and plays a role in distributing electric energy in the power network. In an urban power grid system, a power distribution network refers to a power grid with a voltage grade of 35KV and below, and is used for supplying power to each power distribution station and various power loads in a city, the power distribution network generally adopts closed-loop design and open-loop operation, and the structure of the power distribution network is radial.
The distribution network does not carry out detailed data analysis to user's actual conditions before the electric wire netting circuit segmentation, directly carry out the segmentation to the circuit of electric wire netting, probably there is segmentation unscientific phenomenon, reliability when influencing the distribution network operation, the line structure of distribution network lacks improvement and optimization, be unfavorable for the promotion of maximum power supply ability and maximum load rate, and the degree of coordination is not enough between the high-voltage substation of distribution network and subordinate's electric wire netting, only adopt two liang of interconnected contact passageways to guarantee higher power supply ability, be not convenient for practice thrift the contact passageway between the main transformer station and the meticulous planning and the construction of distribution network rack. Therefore, a fine planning method for the power distribution network in the construction area is provided for solving the problems.
Disclosure of Invention
The invention aims to solve the problems and provide a method for finely planning a power distribution network in a construction area.
The invention achieves the aim through the following technical scheme, and a fine planning method for a power distribution network in a construction area comprises the following steps:
(1) analyzing data and selecting sites, analyzing the power utilization condition and power utilization load of a user when the power grid is planned in a sectional mode, and properly increasing or reducing the range of the power grid section, so that the power grid section is scientifically planned, the sectional range of the power grid is changed according to the distribution of the user, and the site selection and the new construction are carried out on a transformer substation;
(2) and the load rate divides the planned power grid into a newly-built power grid and an existing power grid. For a newly-built power grid, power supply architecture planning and medium-voltage feeder line contact structure planning are carried out according to power supply capacity calculation on the basis of traditional planning, the maximum load rate is reached, for the existing power grid, whether the improvement of the equipment load rate after the network structure of the power distribution network is modified can meet the load increase is judged, and if the improvement of the equipment load rate cannot meet the load increase, the construction of a newly-added transformer substation is carried out;
(3) establishing main transformer interconnection, and establishing a power distribution network interconnection structure model of a main transformer-medium voltage line based on power supply capacity from the basic starting point of regional power supply capacity and saving of communication channels between main transformer stations, so as to establish a reasonable medium voltage network frame which meets the reliability requirement of a power distribution network and makes full use of power distribution network equipment;
(4) calculating the contact capacity and the contact quantity, calculating the contact capacity of the maximum power supply capacity of the network and the contact quantity of the medium-voltage feeder line according to the established main transformer interconnection model to form a medium-voltage distribution network planning scheme, and forming a medium-voltage network frame transformation scheme which meets the load increase of the power supply capacity of the existing power supply framework;
(5) optimizing and transforming a power grid, constructing a power distribution network optimization planning model by taking the size of power supply capacity, the total length of newly-built lines and the total number of additional switches as objective functions, establishing complete connection of pairwise interconnection of n substations in the power distribution network to be planned, and sequentially deleting unreasonable interconnection relations on the basis of completely connecting a power supply framework to form a power supply framework consisting of reasonable interconnection relations.
Preferably, the site selection of the substation in the step (1) includes establishing an existing high-voltage substation power supply architecture and a newly-built power supply architecture in a planning area.
Preferably, the main transformer interconnection structure in the step (2) adopts an interconnection form that any main transformer of a transformer substation is only communicated with one main transformer of an opposite side station of the interconnection.
Preferably, the maximum load rate of the newly-built power grid in the step (2) ranges from 60.5% to 82.5%.
Preferably, the main transformer interconnection structure in the step (3) fully coordinates the relationship between the high-voltage transformer substation and the lower-level power grid.
Preferably, in the step (4), the number of the medium-voltage feeders with the maximum power supply capacity is 12, the number of the intra-station links is 6, and the number of the inter-station links is 6.
Preferably, two nodes of the line in the step (4) do not include a main transformer bus node, and no switch is added in the previous line between the two nodes, the two nodes do not include the main transformer bus node, and a line already exists between the two nodes, that is, the interconnection switch is changed into a section switch.
Preferably, in the power grid optimization of step (5), the number of interconnection relations among n substations is C2 n。
Preferably, when the unreasonable interconnection relationship is deleted in the step (5), the number range of the interconnection substation degrees of the power supply framework is 1-4.
Preferably, when the unreasonable interconnection relationship is deleted in the step (5), the interconnection relationship is deleted in sequence according to the distance between the interconnected substations from large to small, and the transformer substations are built until the degree of the transformer substations is within 4.
The invention has the beneficial effects that: the fine planning method disclosed by the invention adopts a mode of analyzing firstly and then interconnecting, a newly-built power grid and an existing power grid are distinguished, the fine planning of the medium-voltage distribution power grid is realized by adopting different steps, the construction of the power distribution network is facilitated, the defects of unscientific line segmentation of the power grid and lower reliability of the operation of the power distribution network are changed, the line of the power distribution network is optimized, and the maximum power supply capacity and the maximum load rate of the power distribution network in operation are improved.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a fine planning method for a power distribution network in a construction area comprises the following steps:
(1) analyzing data and selecting sites, analyzing the power utilization condition and power utilization load of a user when the power grid is planned in a sectional mode, and properly increasing or reducing the range of the power grid section, so that the power grid section is scientifically planned, the sectional range of the power grid is changed according to the distribution of the user, and the site selection and the new construction are carried out on a transformer substation;
(2) and the load rate divides the planned power grid into a newly-built power grid and an existing power grid. For a newly-built power grid, power supply architecture planning and medium-voltage feeder line contact structure planning are carried out according to power supply capacity calculation on the basis of traditional planning, the maximum load rate is reached, for the existing power grid, whether the improvement of the equipment load rate after the network structure of the power distribution network is modified can meet the load increase is judged, and if the improvement of the equipment load rate cannot meet the load increase, the construction of a newly-added transformer substation is carried out;
(3) establishing main transformer interconnection, and establishing a power distribution network interconnection structure model of a main transformer-medium voltage line based on power supply capacity from the basic starting point of regional power supply capacity and saving of communication channels between main transformer stations, so as to establish a reasonable medium voltage network frame which meets the reliability requirement of a power distribution network and makes full use of power distribution network equipment;
(4) calculating the contact capacity and the contact quantity, calculating the contact capacity of the maximum power supply capacity of the network and the contact quantity of the medium-voltage feeder line according to the established main transformer interconnection model to form a medium-voltage distribution network planning scheme, and forming a medium-voltage network frame transformation scheme which meets the load increase of the power supply capacity of the existing power supply framework;
(5) optimizing and transforming a power grid, constructing a power distribution network optimization planning model by taking the size of power supply capacity, the total length of newly-built lines and the total number of additional switches as objective functions, establishing complete connection of pairwise interconnection of n substations in the power distribution network to be planned, and sequentially deleting unreasonable interconnection relations on the basis of completely connecting a power supply framework to form a power supply framework consisting of reasonable interconnection relations.
Further, the site selection of the substation in the step (1) includes establishing an existing high-voltage substation power supply architecture and a newly-built power supply architecture in a planning area.
Further, the maximum load rate of the newly-built power grid in the step (2) is 60.5%.
Further, the main transformer interconnection structure in the step (3) adopts an interconnection form that any main transformer of the transformer substation is only communicated with one main transformer of the opposite side station, and a simple main transformer interconnection structure is adopted, so that the complicated pairwise interconnection is reduced, and the complexity of scheduling is avoided under the condition of ensuring the maximum load rate of equipment.
Further, the main transformer interconnection structure in the step (3) fully coordinates the relationship between the high-voltage transformer substation and the lower-level power grid.
Further, in the step (4), the number of the medium-voltage feeders with the maximum power supply capacity is 12, 6 intra-station tie lines and 6 inter-station tie lines.
Furthermore, two nodes of the line in the step (4) do not include a main transformer bus node, and a previous line between the two nodes does not include a switch, the two nodes do not include the main transformer bus node, and a line already exists between the two nodes, namely, the interconnection switch is changed into a section switch.
Further, in the power grid optimization of the step (5), the number of interconnection relations among n transformer substations is C2 n。
Further, when the unreasonable interconnection relation is deleted in the step (5), the number range of the interconnection substation degrees of the power supply framework is 1.
Further, when the unreasonable interconnection relationship is deleted in the step (5), the interconnection relationship is deleted in sequence according to the distance between the interconnected substations from large to small, and the transformer substations are built until the degree of the transformer substations is within 4.
The fine planning method is suitable for the maximum load rate of the power supply framework of the power distribution network to be 60.5% when the traditional main transformer operation mode adopts the capacity-load ratio of 1.9.
Example two:
a fine planning method for a power distribution network in a construction area comprises the following steps:
(1) analyzing data and selecting sites, analyzing the power utilization condition and power utilization load of a user when the power grid is planned in a sectional mode, and properly increasing or reducing the range of the power grid section, so that the power grid section is scientifically planned, the sectional range of the power grid is changed according to the distribution of the user, and the site selection and the new construction are carried out on a transformer substation;
(2) and the load rate divides the planned power grid into a newly-built power grid and an existing power grid. For a newly-built power grid, power supply architecture planning and medium-voltage feeder line contact structure planning are carried out according to power supply capacity calculation on the basis of traditional planning, the maximum load rate is reached, for the existing power grid, whether the improvement of the equipment load rate after the network structure of the power distribution network is modified can meet the load increase is judged, and if the improvement of the equipment load rate cannot meet the load increase, the construction of a newly-added transformer substation is carried out;
(3) establishing main transformer interconnection, and establishing a power distribution network interconnection structure model of a main transformer-medium voltage line based on power supply capacity from the basic starting point of regional power supply capacity and saving of communication channels between main transformer stations, so as to establish a reasonable medium voltage network frame which meets the reliability requirement of a power distribution network and makes full use of power distribution network equipment;
(4) calculating the contact capacity and the contact quantity, calculating the contact capacity of the maximum power supply capacity of the network and the contact quantity of the medium-voltage feeder line according to the established main transformer interconnection model to form a medium-voltage distribution network planning scheme, and forming a medium-voltage network frame transformation scheme which meets the load increase of the power supply capacity of the existing power supply framework;
(5) optimizing and transforming a power grid, constructing a power distribution network optimization planning model by taking the size of power supply capacity, the total length of newly-built lines and the total number of additional switches as objective functions, establishing complete connection of pairwise interconnection of n substations in the power distribution network to be planned, and sequentially deleting unreasonable interconnection relations on the basis of completely connecting a power supply framework to form a power supply framework consisting of reasonable interconnection relations.
Further, the site selection of the substation in the step (1) includes establishing an existing high-voltage substation power supply architecture and a newly-built power supply architecture in a planning area.
Further, the maximum load rate in the step (2) is 82.5%.
Further, the main transformer interconnection structure in the step (3) adopts an interconnection form that any main transformer of the transformer substation is only communicated with one main transformer of the opposite side station, and a simple main transformer interconnection structure is adopted, so that the complicated pairwise interconnection is reduced, and the complexity of scheduling is avoided under the condition of ensuring the maximum load rate of equipment.
Further, the main transformer interconnection structure in the step (3) fully coordinates the relationship between the high-voltage transformer substation and the lower-level power grid.
Further, in the step (4), the number of the medium-voltage feeders with the maximum power supply capacity is 12, 6 intra-station tie lines and 6 inter-station tie lines.
Furthermore, two nodes of the line in the step (4) do not include a main transformer bus node, and a previous line between the two nodes does not include a switch, the two nodes do not include the main transformer bus node, and a line already exists between the two nodes, namely, the interconnection switch is changed into a section switch.
Further, in the power grid optimization of the step (5), the number of interconnection relations among n transformer substations is C2 n。
Further, when the unreasonable interconnection relation is deleted in the step (5), the number range of the interconnection substation degrees of the power supply framework is 4.
Further, when the unreasonable interconnection relationship is deleted in the step (5), the interconnection relationship is deleted in sequence according to the distance between the interconnected substations from large to small, and the transformer substations are built until the degree of the transformer substations is within 4.
The fine planning method is suitable for a power supply framework with the maximum load rate of 82.5% of main transformer interconnection when the main transformer runs.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A construction area power distribution network fine planning method is characterized by comprising the following steps: the fine planning method comprises the following steps:
(1) analyzing data and selecting sites, analyzing the power utilization condition and power utilization load of a user when the power grid is planned in a sectional mode, and properly increasing or reducing the range of the power grid section, so that the power grid section is scientifically planned, the sectional range of the power grid is changed according to the distribution of the user, and the site selection and the new construction are carried out on a transformer substation;
(2) and the load rate divides the planned power grid into a newly-built power grid and an existing power grid. For a newly-built power grid, power supply architecture planning and medium-voltage feeder line contact structure planning are carried out according to power supply capacity calculation on the basis of traditional planning, the maximum load rate is reached, for the existing power grid, whether the improvement of the equipment load rate after the network structure of the power distribution network is modified can meet the load increase is judged, and if the improvement of the equipment load rate cannot meet the load increase, the construction of a newly-added transformer substation is carried out;
(3) establishing main transformer interconnection, and establishing a power distribution network interconnection structure model of a main transformer-medium voltage line based on power supply capacity from the basic starting point of regional power supply capacity and saving of communication channels between main transformer stations, so as to establish a reasonable medium voltage network frame which meets the reliability requirement of a power distribution network and makes full use of power distribution network equipment;
(4) calculating the contact capacity and the contact quantity, calculating the contact capacity of the maximum power supply capacity of the network and the contact quantity of the medium-voltage feeder line according to the established main transformer interconnection model to form a medium-voltage distribution network planning scheme, and forming a medium-voltage network frame transformation scheme which meets the load increase of the power supply capacity of the existing power supply framework;
(5) optimizing and transforming a power grid, constructing a power distribution network optimization planning model by taking the size of power supply capacity, the total length of newly-built lines and the total number of additional switches as objective functions, establishing complete connection of pairwise interconnection of n substations in the power distribution network to be planned, and sequentially deleting unreasonable interconnection relations on the basis of completely connecting a power supply framework to form a power supply framework consisting of reasonable interconnection relations.
2. The fine planning method for the power distribution network in the construction area according to claim 1, characterized in that: and (2) site selection of the transformer substation in the step (1) comprises establishment of an existing high-voltage transformer substation power supply framework and a newly-built power supply framework in a planning area.
3. The fine planning method for the power distribution network in the construction area according to claim 1, characterized in that: the range of the maximum load rate of the newly built power grid in the step (2) is 60.5% -82.5%.
4. The fine planning method for the power distribution network in the construction area according to claim 1, characterized in that: any main transformer of the transformer substation is only communicated with one main transformer of the interconnected opposite side station, and the simple main transformer interconnection structure is adopted, so that the complicated pairwise interconnection is reduced, and the complexity of scheduling is avoided under the condition of ensuring the maximum load rate of equipment.
5. The fine planning method for the power distribution network in the construction area according to claim 1, characterized in that: and (4) fully coordinating the relationship between the high-voltage transformer substation and the lower-level power grid by the main transformer interconnection structure in the step (3).
6. The fine planning method for the power distribution network in the construction area according to claim 1, characterized in that: and (4) in the step (4), the number of the medium-voltage feeders with the maximum power supply capacity is 12, 6 in-station connecting lines and 6 between-station connecting lines.
7. The fine planning method for the power distribution network in the construction area according to claim 1, characterized in that: and (4) two nodes of the line in the step (4) do not comprise a main transformer bus node, and no switch is additionally arranged in the previous line between the two nodes.
8. The fine planning method for the power distribution network in the construction area according to claim 1, characterized in that: in the power grid optimization of the step (5), the number of interconnection relations among the n transformer substations is C2 n。
9. The fine planning method for the power distribution network in the construction area according to claim 1, characterized in that: and (5) when the unreasonable interconnection relation is deleted, the number range of the interconnection substation degrees of the power supply framework is 1-4.
10. The fine planning method for the power distribution network in the construction area according to claim 1, characterized in that: and (5) when the unreasonable interconnection relation is deleted, sequentially deleting the interconnection relation according to the distance between the interconnection transformer stations from large to small.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113708369A (en) * | 2021-08-30 | 2021-11-26 | 天津大学 | Medium-voltage distribution network power supply unit division method based on relaxation load rate control |
| CN117543722A (en) * | 2024-01-09 | 2024-02-09 | 国网湖北省电力有限公司经济技术研究院 | Distribution network element planning method, system and medium considering distributed power supply |
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| CN103116807A (en) * | 2012-12-12 | 2013-05-22 | 天津市电力公司 | Functional area power distribution network refined planning method |
| CN103401233A (en) * | 2013-07-17 | 2013-11-20 | 天津大学 | Power distribution network contact construction sequence optimization method based on maximum power supply capability |
| CN104281892A (en) * | 2014-10-15 | 2015-01-14 | 国家电网公司 | New construction and reconstruction planning cooperative optimization method for main equipment in power distribution network |
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| CN103116807A (en) * | 2012-12-12 | 2013-05-22 | 天津市电力公司 | Functional area power distribution network refined planning method |
| CN103401233A (en) * | 2013-07-17 | 2013-11-20 | 天津大学 | Power distribution network contact construction sequence optimization method based on maximum power supply capability |
| CN104281892A (en) * | 2014-10-15 | 2015-01-14 | 国家电网公司 | New construction and reconstruction planning cooperative optimization method for main equipment in power distribution network |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113708369A (en) * | 2021-08-30 | 2021-11-26 | 天津大学 | Medium-voltage distribution network power supply unit division method based on relaxation load rate control |
| CN113708369B (en) * | 2021-08-30 | 2023-09-08 | 天津大学 | Medium-voltage distribution network power supply unit division method based on relaxation load rate control |
| CN117543722A (en) * | 2024-01-09 | 2024-02-09 | 国网湖北省电力有限公司经济技术研究院 | Distribution network element planning method, system and medium considering distributed power supply |
| CN117543722B (en) * | 2024-01-09 | 2024-03-29 | 国网湖北省电力有限公司经济技术研究院 | Distribution network element planning method, system and medium considering distributed power supply |
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Application publication date: 20201117 |