CN107658872B - Power grid transformation method for optimizing 35KV substation access - Google Patents
Power grid transformation method for optimizing 35KV substation access Download PDFInfo
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- CN107658872B CN107658872B CN201711002680.0A CN201711002680A CN107658872B CN 107658872 B CN107658872 B CN 107658872B CN 201711002680 A CN201711002680 A CN 201711002680A CN 107658872 B CN107658872 B CN 107658872B
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- 238000011426 transformation method Methods 0.000 title claims abstract description 7
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- 238000010586 diagram Methods 0.000 description 5
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- H02J3/005—
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected 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 power grid transformation method for optimizing 35kV substation access, which comprises the following steps: step 1, collecting the current situation and planning data of a 35kV transformer substation accessed to a power grid; step 2, judging whether the 35kV substation access power grid meets the transformation conditions; and 3, transforming the 35kV transformer substation access power grid. According to the invention, through studying and judging the characteristics of the regional power grid structure, on the premise of not increasing or reasonably increasing the engineering quantity, two loops of large-section wires are newly taken out from a 220 KV substation and are connected to a 35KV bus of a 110KV substation, the 35KV side of the 110KV substation is regarded as a 35KV switching station, a line switch at the 35KV side of the 110KV substation is opened, and the peripheral 35KV substation load is connected to the 220 KV substation through the 35KV switching station, so that the power supply capacity of the 10KV side of the 110KV substation is improved, the transformation level is reduced, the line loss is reduced, and the line investment is saved.
Description
Technical Field
The invention relates to the technical field of power system planning, in particular to a power grid transformation method for optimizing 35kV substation access.
Background
In recent years, with the rapid development of domestic economy, the construction of power grids continues to develop at a high speed, the distribution quantity of all levels of substations is continuously increased, and the phenomenon of incompatibility of all levels of power grids in part areas occurs, for example, 35kv substation power supplies in part areas, particularly rural areas, mostly come from 110kv substations, thereby causing the following problems:
1. the transformation capacity of the 110kV transformer substation is mostly occupied by 35kV loads, the power supply capacity of the 10kV side is weak, the regional economic development requirement cannot be met, or a new 110kV transformer substation has to be built in advance, and the investment is increased.
2. Compared with 220/35 kV voltage reduction, the problem of repeated voltage reduction exists by 110/35 kV voltage reduction, and the line loss is large.
3. If a newly-outlet line of a 220 KV transformer substation is used for supplying power for a newly-built 35KV transformer substation (including a user station), the defects of long power supply distance, multiple circuit loops, large circuit investment, more 35KV outlet line intervals of the transformer substation and the like exist.
Therefore, in power grid planning, reasonable transformation of 35kV substations is fully considered, repeated voltage reduction is reduced, and the improvement of the scientificity and economy of the operation of the main transformer of each voltage class substation is of great significance for guaranteeing the health and rapid development of a power grid.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a power grid transformation method for optimizing the access of a 35kV transformer substation, which can improve the connection belt capacity of the 35kV side of a 220 kV transformer substation and the 10kV side of a 110kV transformer substation, optimize a grid structure and improve the regional power supply capacity.
The technical scheme adopted for solving the technical problems is as follows:
the power grid transformation method for optimizing 35kV substation access provided by the embodiment of the invention comprises the following steps:
step 1, collecting the current situation and planning data of a 35kV transformer substation accessed to a power grid;
and 3, transforming the 35kV transformer substation access power grid.
As a possible implementation manner of this embodiment, the specific process of step 2 includes the following steps:
step 21, judging whether a heavy load phenomenon occurs in a current or planned 110kV transformer substation adopting an 110/35/10 kV voltage sequence, if so, entering the next step, otherwise, exiting;
step 22, judging whether the load on the 35kV side of the 110kV transformer substation is larger, if so, entering the next step, otherwise, exiting;
and 23, judging whether the 220 kV transformer substations around the 110kV transformer substation have 35kV standby outgoing line intervals, if so, modifying the 35kV transformer substation to be connected into the power grid, and otherwise, quitting.
As a possible implementation manner of this embodiment, when the load factor of the 110kV substation is greater than 70%, it is determined that the load on the 35kV side of the 110kV substation is large.
As a possible implementation manner of this embodiment, in step 3, the process of modifying the access of the 35kV substation to the grid is to newly exit a 2-way line from a 220 kV substation around the 110kV substation to a 35kV bus of the 110kV substation.
As a possible implementation manner of this embodiment, the specific process of step 3 includes the following steps:
step 31, newly generating 2 loops of large-section lines from a 220 kV substation nearest to the 110kV substation to a 35kV bus of the 110kV substation, and regarding a 35kV side of the 110kV substation as a 35kV switching station
And step 32, opening a 35kV side line switch of the 110kV substation, and connecting loads of 35kV substations around the 110kV substation to the 220 kV substation through the 35kV switch station.
As a possible implementation manner of this embodiment, the specific process of step 3 further includes the following steps:
step 33, when the load rate of the 220 kV transformer substation at the upper-level power supply point of the 110kV transformer substation is higher than 60%, newly building the 110kV transformer substation, and switching the incoming line of the 110kV transformer substation to other 220 kV transformer substations; if the area forms a 35kV power grid, 110/35/10 voltage transformation layers are adopted;
and step 34, alternately changing the three-winding transformer of the 110kV transformer substation to a newly-built 110kV transformer substation adopting 110/35/10 transformation layers, and simultaneously changing the 110kV transformer substation to a double-winding transformer to carry 10kV load.
The technical scheme of the embodiment of the invention has the following beneficial effects:
according to the technical scheme of the embodiment of the invention, two loops of large-section wires newly come out from a 220 KV substation and are connected to a 35KV bus of a 110KV substation on the premise of not increasing or reasonably increasing the engineering quantity by studying and judging the characteristics of a regional power grid structure, the 35KV side of the 110KV substation is regarded as a 35KV switching station, a line switch at the 35KV side of the 110KV substation is opened, and the load of the peripheral 35KV substation (user station) is connected to the 220 KV substation through the 35KV switching station, so that the power supply capacity of the 10KV side of the 110KV substation is improved, the transformation level is reduced, the line loss is reduced, the line investment is saved, and the utilization efficiency of the outgoing line interval of the 35KV substation of the 220 KV is improved.
According to the technical scheme of the embodiment of the invention, the load carrying capacity of 35kV side and 10kV side of 110kV transformer substation of 220 kV transformer substation can be improved by switching the double-circuit large-section lead (type JL/G1A-300 or more overhead lead), the load carrying capacity is reasonably carried, and the regional power supply capacity is improved; and the original three-winding transformer is alternately connected to a newly-built transformer substation by combining the regional grid structure, so that the resource waste is avoided.
Drawings
Fig. 1 is a flow diagram illustrating a method of grid transformation to optimize access to a 35kv substation, according to an exemplary embodiment;
fig. 2 is a schematic structural diagram of an 220/110/35 kv access mode power grid in a certain area in the prior art;
fig. 3 is a schematic structural diagram of a modified power grid shown in fig. 2 according to the technical solution of the embodiment of the present invention.
Detailed Description
In order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
Fig. 1 is a flow chart illustrating a method of grid transformation to optimize access to a 35kv substation according to an exemplary embodiment. As shown in fig. 1, a method for modifying a power grid to optimize access of a 35kv substation provided in an embodiment of the present invention may include the following steps:
step 1, collecting the current situation and planning data of a 35kV transformer substation accessed to a power grid;
and 3, transforming the 35kV transformer substation access power grid.
In a possible implementation manner, the specific process of step 2 includes the following steps:
step 21, judging whether a heavy load phenomenon occurs in a current or planned 110kV transformer substation adopting an 110/35/10 kV voltage sequence, if so, entering the next step, otherwise, exiting;
step 22, judging whether the load on the 35kV side of the 110kV transformer substation is larger, if so, entering the next step, otherwise, exiting;
and 23, judging whether the 220 kV transformer substations around the 110kV transformer substation have 35kV standby outgoing line intervals, if so, modifying the 35kV transformer substation to be connected into the power grid, and otherwise, quitting.
In one possible implementation manner, when the load factor of the 110kV substation is greater than 70%, the load on the 35kV side of the 110kV substation is determined to be a large condition.
In a possible implementation manner, in step 3, the process of modifying the access of the 35kV substation to the grid is to newly exit a 2-way line from a 220 kV substation around the 110kV substation to a 35kV bus of the 110kV substation.
In a possible implementation manner, the specific process of step 3 includes the following steps: step 31, newly generating 2 loops of large-section lines from a 220 kV substation nearest to the 110kV substation to a 35kV bus of the 110kV substation, and regarding a 35kV side of the 110kV substation as a 35kV switching station;
and step 32, opening a 35kV side line switch of the 110kV substation, and connecting loads of 35kV substations around the 110kV substation to the 220 kV substation through the 35kV switch station.
In a possible implementation manner, the specific process of step 3 further includes the following steps:
step 33, when the load rate of the 220 kV transformer substation at the upper-level power supply point of the 110kV transformer substation is higher than 60%, newly building the 110kV transformer substation, and switching the incoming line of the 110kV transformer substation to other 220 kV transformer substations; if the area forms a 35kV power grid, 110/35/10 voltage transformation layers are adopted; (ii) a
And step 34, alternately changing the three-winding transformer of the 110kV transformer substation to a newly-built 110kV transformer substation adopting 110/35/10 transformation layers, and simultaneously changing the 110kV transformer substation to a double-winding transformer to carry 10kV load.
Fig. 2 is a schematic structural diagram of an 220/110/35 kv access mode power grid in a certain area in the prior art; fig. 3 is a schematic structural diagram of a modified power grid shown in fig. 2 according to the technical solution of the embodiment of the present invention. As shown in fig. 2 and 3, the specific process of modifying the existing power grid shown in fig. 2 by using the technical solution of the embodiment of the present invention is as follows: collecting the current situation and planning data of the power grid shown in fig. 2, judging whether a heavy load phenomenon occurs in a 110kV transformer substation A adopting an 110/35/10 kV voltage sequence at present or in planning, and if so, continuously judging whether the load on a 35kV side of the 110kV transformer substation is large; if yes, judging whether 35kV standby outlet intervals exist in peripheral 220 kV transformer substations; if 2 new large-section lines are drawn from a 220 KV substation to a 110KV substation, 35KV buses are transformed.
As shown in fig. 2, the distance between the 110kv substation a and the 220 kv substation i is less than 3 km, and the wave impedance is ignored. The 110kv substation a is mainly connected with loads of 35kv public stations and subscriber stations. When the load factor of the 110kV substation a exceeds 70% and the load factor of the 220 kV substation i is less than 40%, the 220 kV substation i must have a 35kV interval or an extensible 35kV interval, and it can be considered that the condition for transforming the substation i by using the technical scheme of the embodiment of the present invention is provided. After the power grid shown in fig. 2 is transformed by adopting the technical scheme of the embodiment of the invention, the load rate of the 220 kv substation i is continuously improved along with the continuous development of the load, when the load is higher than 60%, in order to transfer part of the load connected with the substation to the 220 kv substation ii and the 220 kv substation iii, the 110kv substation D is planned and constructed, and the load rate of the 220 kv substation i is reduced by adjusting the operation mode. The area of the 110kV substation D is provided with a rudimentary 35kV power grid which is designed according to a three-winding transformer. And (4) rotating the three-winding transformer of the 110kV transformer substation A to the 110kV transformer substation D, and connecting the 110kV transformer substation A with a 10kV load by using a double-winding transformer.
According to the embodiment, by studying and judging the characteristics of the regional power grid structure, on the premise that the project amount is not increased or reasonably increased, two loops of large-section wires are newly taken out from a 220 KV substation and are connected to a 35KV bus of a 110KV substation, the 35KV side of the 110KV substation is regarded as a 35KV switch station, a 35KV side wire incoming switch of the 110KV substation is turned on, and the load of the peripheral 35KV substation (user station) is connected to the 220 KV substation through the 35KV switch station, so that the power supply capacity of the 10KV side of the 110KV substation is improved, the transformation level is reduced, the wire loss is reduced, the line investment is saved, and meanwhile, the utilization efficiency of 35KV wire outgoing intervals of the 220 KV substation can be improved.
In the embodiment, the load connection capacity of 35kV side and 10kV side of a 220 kV transformer substation can be improved by connecting double-circuit large-section conductors (type JL/G1A-300 and above overhead conductors), loads are connected reasonably, and the regional power supply capacity is improved; and the original three-winding transformer is alternately connected to a newly-built transformer substation by combining the regional grid structure, so that the resource waste is avoided.
The foregoing is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the invention, and such modifications and improvements are also considered to be within the scope of the invention.
Claims (2)
1. A power grid transformation method for optimizing 35kV substation access is characterized by comprising the following steps:
step 1, collecting the current situation and planning data of a 35kV transformer substation accessed to a power grid;
step 2, judging whether the 35kV substation access power grid meets the transformation conditions;
step 3, transforming the 35KV substation access power grid;
the specific process of the step 2 comprises the following steps:
step 21, judging whether a heavy load phenomenon occurs in a current or planned 110kV transformer substation adopting an 110/35/10 kV voltage sequence, if so, entering the next step, otherwise, exiting;
step 22, judging whether the load on the 35kV side of the 110kV transformer substation is large, if so, entering the next step, and if not, exiting;
step 23, judging whether a 220 KV substation surrounding the 110KV substation has 35KV standby outlet intervals, if so, modifying the 35KV substation to be connected into a power grid, and otherwise, quitting;
the specific process of the step 3 comprises the following steps:
step 31, newly generating 2 loops of large-section lines from a 220 KV substation closest to the 110KV substation to a 35KV bus of the 110KV substation, and regarding a 35KV side of the 110KV substation as a 35KV switching station;
step 32, opening a 35kV side line switch of the 110kV substation, and connecting loads of 35kV substations around the 110kV substation to the 220 kV substation through the 35kV switch station;
step 33, when the load rate of the 220 kV transformer substation at the upper-level power supply point of the 110kV transformer substation is higher than 60%, newly building the 110kV transformer substation, and switching the incoming line of the 110kV transformer substation to other 220 kV transformer substations; if the area forms a 35kV power grid, 110/35/10 voltage transformation layers are adopted;
and step 34, alternately changing the three-winding transformer of the 110kV transformer substation to a newly-built 110kV transformer substation adopting 110/35/10 transformation layers, and simultaneously changing the 110kV transformer substation to a double-winding transformer to carry 10kV load.
2. The method for transforming the power grid for optimizing the access of the 35kV substation according to claim 1, wherein when the load rate of the 110kV substation is greater than 70%, the load on the 35kV side of the 110kV substation is determined to be a larger condition.
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| CN105354645A (en) * | 2015-12-02 | 2016-02-24 | 国网山东省电力公司经济技术研究院 | 220kV transformer substation load transfer method |
| CN106451462A (en) * | 2016-11-01 | 2017-02-22 | 国网上海市电力公司 | Method for improving transfer supply capability of substation of power distribution network |
| CN106487012A (en) * | 2016-11-30 | 2017-03-08 | 云南电网有限责任公司 | A kind of system of selection of high voltage distribution network powering mode and system |
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2017
- 2017-10-24 CN CN201711002680.0A patent/CN107658872B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2461459A2 (en) * | 2010-12-01 | 2012-06-06 | Technische Universität Dortmund | Control system |
| CN103855618A (en) * | 2014-03-31 | 2014-06-11 | 国网上海市电力公司 | 10kV switching station |
| CN105354645A (en) * | 2015-12-02 | 2016-02-24 | 国网山东省电力公司经济技术研究院 | 220kV transformer substation load transfer method |
| CN106451462A (en) * | 2016-11-01 | 2017-02-22 | 国网上海市电力公司 | Method for improving transfer supply capability of substation of power distribution network |
| CN106487012A (en) * | 2016-11-30 | 2017-03-08 | 云南电网有限责任公司 | A kind of system of selection of high voltage distribution network powering mode and system |
Non-Patent Citations (1)
| Title |
|---|
| 220KV寿州变电站综合自动化改造;汪东;《中国优秀硕士论文全文数据库 工程科技II辑》;20110630(第6期);第1-36页 * |
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