CN109193620B - Method and system for determining power transmission line scheme based on meter wave frequency band low passive interference - Google Patents
Method and system for determining power transmission line scheme based on meter wave frequency band low passive interference Download PDFInfo
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- CN109193620B CN109193620B CN201810997200.7A CN201810997200A CN109193620B CN 109193620 B CN109193620 B CN 109193620B CN 201810997200 A CN201810997200 A CN 201810997200A CN 109193620 B CN109193620 B CN 109193620B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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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
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Abstract
The invention discloses a method and a system for determining a transmission line scheme based on meter wave frequency band low passive interference, which comprises the following steps: expanding the initial power transmission line scheme by taking the lowest height as a target, and determining a plurality of alternative schemes; respectively calculating the sum of the section circumferences of all the sub-conductors corresponding to different conductor types in each alternative scheme; for different tower types, respectively calculating the passive interference values of the corresponding alternative schemes in an ascending arrangement mode according to the sum of the section circumferences of all the sub-conductors corresponding to the different conductor types until the passive interference values are larger than or equal to a preset critical threshold value; and selecting the alternative design scheme with the lowest economic cost from all the alternative schemes with the passive interference value smaller than the preset critical threshold value as the final transmission line scheme. The invention simplifies the calculation workload, selects the optimal transmission line scheme from multiple angles, obviously reduces the problem of line cost increase caused by passive interference influence in the later period, and provides support for the erection design of the transmission line.
Description
Technical Field
The invention relates to the technical field of electromagnetic environments of power transmission lines, in particular to a method and a system for determining a scheme of a power transmission line based on meter-wave frequency band low passive interference.
Background
After the power transmission line is erected, electromagnetic scattering can be generated on the power transmission line, the overhead ground wire and the iron tower due to electromagnetic waves emitted by a nearby radio station or incident by remote radio, so that the receiving effect of the nearby radio receiving station is influenced, namely: passive interference effects. In the existing transmission line design, the improvement scheme of passive interference is hardly considered, that is, the influence of passive interference is not taken into consideration. Therefore, a problem of line cost increase which may be caused by the influence of the passive disturbance at a later stage is caused to occur.
Because the electromagnetic waves emitted by the meter-wave frequency band radar mainly take an electric field parallel to the ground as a main factor, the section and the erection height of a wire of the power transmission line are main influence factors on the passive interference of the frequency band radar. Therefore, a method for determining a scheme of a power transmission line based on meter-wave frequency band low passive interference is needed to solve the problem that passive interference is hardly considered in the design of the existing power transmission line, so that the later maintenance economic cost is high.
Disclosure of Invention
The invention provides a method and a system for determining a power transmission line scheme based on meter-wave frequency band low passive interference, which aim to solve the problems that the existing power transmission line scheme is incomplete in consideration factors and high in later-period maintenance economic cost.
In order to solve the above problem, according to an aspect of the present invention, there is provided a method for determining a power transmission line scheme based on meter-wave frequency band low passive interference, where the method includes:
expanding by taking the lowest height as a target according to the transmission line attribute in the initial transmission line scheme, and determining a plurality of alternative schemes; wherein the transmission line attributes include: the type of the conductor, the type of the tower and the highest erection height;
respectively calculating the sum of the section circumferences of all the sub-conductors corresponding to different conductor types in each alternative scheme;
for different tower types, respectively calculating the passive interference values of corresponding alternative schemes according to the ascending arrangement mode of the sum of the section circumferences of all the sub-conductors corresponding to the different conductor types until the passive interference values are larger than or equal to a preset critical threshold value;
and calculating the economic cost of all the alternative schemes with the passive interference values smaller than the preset critical threshold value, and selecting the alternative design scheme with the lowest economic cost in all the alternative schemes with the passive interference values smaller than the preset critical threshold value as the final transmission line scheme.
Preferably, when determining a plurality of alternatives by extending according to the transmission line property in the initial transmission line scheme with the aim of minimizing the height,
in the aspect of selecting the type of a tower, selecting a strain tower with a low erection height for a single-circuit power transmission line; and for the double-circuit power transmission line, two single-circuit power transmission lines are erected within a preset distance threshold range of the adjacent radar station.
Preferably, wherein the preset distance threshold is 6 km.
Preferably, wherein the preset critical threshold is 0.5 dB.
According to another aspect of the present invention, there is provided a system for determining a power transmission line scheme based on meter-wave band low passive interference, the system comprising:
the alternative scheme determining unit is used for expanding by taking the lowest height as a target according to the transmission line attribute in the initial transmission line scheme and determining a plurality of alternative schemes; wherein the transmission line attributes include: the type of the conductor, the type of the tower and the highest erection height;
a conductor interface perimeter calculation unit, configured to calculate a sum of cross-sectional perimeters of all sub-conductors corresponding to different conductor types in each alternative;
the passive interference value calculating unit is used for calculating the passive interference values of the corresponding alternative schemes according to the ascending arrangement mode of the sum of the section circumferences of all the sub-conductors corresponding to different conductor types for different tower types respectively until the passive interference values are larger than or equal to a preset critical threshold value;
and the final power transmission line scheme determining unit is used for calculating the economic cost of all the alternative schemes with the passive interference values smaller than the preset critical threshold value, and selecting the alternative design scheme with the lowest economic cost in all the alternative schemes with the passive interference values smaller than the preset critical threshold value as the final power transmission line scheme.
Preferably, when the alternative scheme determining unit determines a plurality of alternative schemes by expanding the transmission line attribute in the initial transmission line scheme with the lowest height as a target,
in the aspect of selecting the type of a tower, selecting a strain tower with a low erection height for a single-circuit power transmission line; and for the double-circuit power transmission line, two single-circuit power transmission lines are erected within a preset distance threshold range of the adjacent radar station.
Preferably, wherein the preset distance threshold is 6 km.
Preferably, wherein the preset critical threshold is 0.5 dB.
The invention provides a method and a system for determining a power transmission line scheme based on meter-wave frequency band low passive interference, which are expanded by taking the lowest height as a target according to the power transmission line attribute in the initial power transmission line scheme to determine a plurality of alternative schemes; for different tower types, respectively calculating the passive interference values of corresponding alternative schemes according to the ascending arrangement mode of the sum of the section circumferences of all the sub-conductors corresponding to the different conductor types until the passive interference values are larger than or equal to a preset critical threshold value; and selecting the alternative design scheme with the lowest economic cost from all the alternative schemes with the passive interference value smaller than the preset critical threshold value as the final transmission line scheme. According to the invention, by setting the passive interference critical value, determining the alternative scheme with low passive interference value according to different lead types and tower types and determining the final transmission line scheme by combining economic cost, the special design can be carried out on the transmission line of the adjacent meter wave frequency band radar station, the calculation workload is simplified, and the idle work is reduced; and because the optimal transmission line scheme is selected from multiple aspects, the problem of line cost increase caused by passive interference influence in the later period is obviously reduced, and support is provided for the erection design of the transmission line.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a flowchart of a method 100 for determining a power transmission line scheme based on meter-wave band low passive interference according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a system 200 for determining a power transmission line scheme based on meter-wave band low passive interference according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flowchart of a method 100 for determining a power transmission line scheme based on meter-wave band low passive interference according to an embodiment of the present invention. As shown in fig. 1, in the method for determining a scheme of an electric transmission line based on low passive interference in a meter-wave frequency band provided by the embodiment of the present invention, by setting a passive interference critical value, determining a candidate scheme with a low passive interference value according to different types of wires and tower types, and determining a final scheme of the electric transmission line in combination with economic cost, a special design can be performed on the electric transmission line adjacent to a meter-wave frequency band radar station, so that the calculation workload is simplified, and useless work is reduced; and because the optimal transmission line scheme is selected from multiple aspects, the problem of line cost increase caused by passive interference influence in the later period is obviously reduced, and support is provided for the erection design of the transmission line. The method 100 for determining the power transmission line scheme based on the meter-wave frequency band low passive interference starts from step 101, and is expanded by taking the lowest height as a target according to the power transmission line attribute in the initial power transmission line scheme in step 101 to determine a plurality of alternative schemes; wherein the transmission line attributes include: conductor type, tower type and maximum erection height.
Preferably, when a plurality of alternative schemes are determined by expanding the transmission line with the lowest height as a target according to the transmission line attribute in the initial transmission line scheme, selecting a strain tower with a low erection height for a single-circuit transmission line in the aspect of selecting the type of the tower; and for the double-circuit power transmission line, two single-circuit power transmission lines are erected within a preset distance threshold range of the adjacent radar station.
Preferably, wherein the preset distance threshold is 6 km.
Preferably, the sum of the cross-sectional perimeters of all sub-wires corresponding to different wire types in each alternative is calculated in step 102, respectively.
Preferably, in step 103, for different tower types, the passive interference values of the corresponding alternative schemes are calculated respectively according to the ascending arrangement mode of the sum of the cross-section circumferences of all the sub-conductors corresponding to the different conductor types, and the calculation is stopped until the passive interference values are greater than or equal to the preset critical threshold value.
Preferably, the economic costs of all the alternatives with the passive interference values smaller than the preset critical threshold are calculated in step 104, and the alternative design scheme with the lowest economic cost among all the alternatives with the passive interference values smaller than the preset critical threshold is selected as the final transmission line scheme.
Preferably, wherein the preset critical threshold is 0.5 dB.
The following specifically exemplifies embodiments of the present invention
Taking a 500kV single-circuit transmission line close to a radar station as an example, the type of a lead in an initial transmission line scheme is 4 XLGJ-400/50, the type of a tower is a cat-head tower, and the highest erection height is 32 meters.
In an embodiment of the invention, the extension is first performed with the aim of minimizing the height according to the initial power transmission line scheme. Wherein, based on the highest erection height, the tower types which can be selected can be determined to comprise: cat head tower and dry word tower. Alternative lead types include: no. 1 lead: 4 XLGJ-400/50; no. 2 lead: XLGJ-400/35 and No. 3 conductor 4 XACSR-720/50. Thus, 6 alternatives are available. The alternatives are shown in table 1.
Table 1 alternative schemes table
| Numbering | Wire type | Type of tower |
| Alternative 1 | 4×LGJ-400/50 | Cat head tower |
| Alternative 2 | 4×LGJ-400/35 | Cat head tower |
| Alternative 3 | 4×ACSR-720/50 | Cat head tower |
| Alternative 4 | 4×LGJ-400/50 | Character-drying tower |
| Alternative 5 | 4×LGJ-400/35 | Character-drying tower |
| Alternative 6 | 4×ACSR-720/50 | Character-drying tower |
Then, the sum of the cross-sectional perimeters of all the sub-wires of the total 3 types of wires in each alternative is calculated, respectively, and the sum of the cross-sectional perimeters of all the sub-wires of each type of wire is shown in table 2.
TABLE 2 Total Cross-sectional perimeter for all sub-conductors for each type of conductor
| Wire type | Sum of section circumferences (cm) |
| 4×LGJ-400/50 | 1041 |
| 4×LGJ-400/35 | 1011 |
| 4×ACSR-720/50 | 1365 |
Then, for different tower types, respectively according to the ascending arrangement mode of the sum of the cross section circumferences of all the sub-conductors corresponding to different conductor types, calculating the passive interference values of the corresponding 6 alternative schemes, and stopping until the passive interference value is greater than or equal to 0.5 dB.
In the embodiment of the present invention, the ascending arrangement of the sum of the circumferences of the cross sections corresponding to different types of wires is: no. 2 conducting wire, No. 1 conducting wire and No. 3 conducting wire. Therefore, when the passive interference value is calculated, and when the tower type is the cat-head tower, the calculation sequence of the passive interference value is the alternative scheme corresponding to the conductor type 2, the conductor type 1 and the conductor type 3 in turn, that is, the following steps are performed in turn: alternative 2, alternative 1, and alternative 3, stop until the passive interference value is greater than or equal to 0.5 dB. When the tower type is a T-shaped tower, the calculation sequence of the passive interference value is alternative 5, alternative 4 and alternative 6 in sequence. And calculating to obtain the product. Only alternatives 4 and 5 comply with passive interference values of less than or equal to 0.5 dB. The method for calculating the passive interference value is mature and will not be described herein.
And finally, calculating the economic cost of all the alternative schemes with the passive interference value smaller than 0.5dB, and selecting the alternative design scheme with the lowest economic cost in all the alternative schemes with the passive interference value smaller than a preset critical threshold value as the final power transmission line scheme. I.e. determining the economic cost of alternative 4 and alternative 5. In the embodiment of the invention, the economic cost is determined by referring to 500kV transmission line tower standard design of southern China Power grid company, and the economic cost of the alternative scheme 4 is 97 ten thousand yuan/km, and the economic cost of the alternative scheme 5 is 91 ten thousand yuan/km, so the alternative scheme 5 is selected as the final transmission line scheme.
Fig. 2 is a schematic structural diagram of a system 200 for determining a power transmission line scheme based on meter-wave band low passive interference according to an embodiment of the present invention. As shown in fig. 2, a system 200 for determining a power transmission line scheme based on meter-wave frequency band low passive interference according to an embodiment of the present invention includes: the system comprises an alternative scheme determining unit 201, a conductor interface perimeter calculating unit 202, a passive disturbance value calculating unit 203 and a final transmission line scheme determining unit 204.
Preferably, the alternative determining unit 201 is configured to expand according to the attribute of the power transmission line in the initial power transmission line scheme with the lowest height as a target to determine a plurality of alternatives; wherein the transmission line attributes include: conductor type, tower type and maximum erection height.
Preferably, in the alternative determining unit 201, when determining a plurality of alternatives by expanding the transmission line attribute in the initial transmission line scheme with the lowest height as the target,
in the aspect of selecting the type of a tower, selecting a strain tower with a low erection height for a single-circuit power transmission line; and for the double-circuit power transmission line, two single-circuit power transmission lines are erected within a preset distance threshold range of the adjacent radar station. Preferably, wherein the preset distance threshold is 6 km.
Preferably, the lead interface circumference calculation unit 202 is configured to calculate a sum of cross-sectional circumferences of all sub-leads corresponding to different lead types in each alternative respectively.
Preferably, the passive interference value calculating unit 203 is configured to calculate, for different tower types, the passive interference values of the corresponding alternative solutions respectively in an ascending order of the sum of the cross-sectional perimeters of all the sub-conductors corresponding to the different conductor types, and stop until the passive interference values are greater than or equal to a preset critical threshold value.
Preferably, the final power transmission line scheme determining unit 204 is configured to calculate economic costs of all alternatives with passive interference values smaller than a preset critical threshold, and select an alternative design scheme with the lowest economic cost from all alternatives with passive interference values smaller than the preset critical threshold as the final power transmission line scheme. Preferably, wherein the preset critical threshold is 0.5 dB.
The system 200 for determining the scheme of the power transmission line based on the meter-wave frequency band low passive interference in the embodiment of the present invention corresponds to the method 100 for determining the scheme of the power transmission line based on the meter-wave frequency band low passive interference in another embodiment of the present invention, and details thereof are not repeated herein.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (8)
1. A method for determining a power transmission line scheme based on meter-wave frequency band low passive interference is characterized by comprising the following steps:
expanding by taking the lowest height as a target according to the transmission line attribute in the initial transmission line scheme, and determining a plurality of alternative schemes; wherein the transmission line attributes include: the type of the conductor, the type of the tower and the highest erection height;
respectively calculating the sum of the section circumferences of all the sub-conductors corresponding to different conductor types in each alternative scheme;
for different tower types, respectively calculating the passive interference values of corresponding alternative schemes according to the ascending arrangement mode of the sum of the section circumferences of all the sub-conductors corresponding to the different conductor types until the passive interference values are larger than or equal to a preset critical threshold value;
and calculating the economic cost of all the alternative schemes with the passive interference values smaller than the preset critical threshold value, and selecting the alternative design scheme with the lowest economic cost in all the alternative schemes with the passive interference values smaller than the preset critical threshold value as the final transmission line scheme.
2. The method according to claim 1, characterized in that, when determining a plurality of alternatives, extended with a goal of a minimum height according to transmission line properties in the initial transmission line scheme,
in the aspect of selecting the type of a tower, selecting a strain tower with a low erection height for a single-circuit power transmission line; and for the double-circuit power transmission line, two single-circuit power transmission lines are erected within a preset distance threshold range of the adjacent radar station.
3. The method of claim 2, wherein the preset distance threshold is 6 km.
4. The method of claim 1, wherein the predetermined threshold is 0.5 dB.
5. A system for determining a scheme of a power transmission line based on meter-wave frequency band low passive interference is characterized by comprising:
the alternative scheme determining unit is used for expanding by taking the lowest height as a target according to the transmission line attribute in the initial transmission line scheme and determining a plurality of alternative schemes; wherein the transmission line attributes include: the type of the conductor, the type of the tower and the highest erection height;
a wire section perimeter calculation unit, configured to calculate a sum of the section perimeters of all sub-wires corresponding to different wire types in each alternative respectively;
the passive interference value calculating unit is used for calculating the passive interference values of the corresponding alternative schemes according to the ascending arrangement mode of the sum of the section circumferences of all the sub-conductors corresponding to different conductor types for different tower types respectively until the passive interference values are larger than or equal to a preset critical threshold value;
and the final power transmission line scheme determining unit is used for calculating the economic cost of all the alternative schemes with the passive interference values smaller than the preset critical threshold value, and selecting the alternative design scheme with the lowest economic cost in all the alternative schemes with the passive interference values smaller than the preset critical threshold value as the final power transmission line scheme.
6. The system according to claim 5, wherein when the alternative determination unit determines a plurality of alternatives by expanding with the lowest height as a target according to the transmission line attribute in the initial transmission line scheme,
in the aspect of selecting the type of a tower, selecting a strain tower with a low erection height for a single-circuit power transmission line; and for the double-circuit power transmission line, two single-circuit power transmission lines are erected within a preset distance threshold range of the adjacent radar station.
7. The system of claim 6, wherein the preset distance threshold is 6 km.
8. The system of claim 5, wherein the predetermined threshold is 0.5 dB.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340357A (en) * | 2011-09-16 | 2012-02-01 | 国网电力科学研究院 | Method for reducing passive jamming of ultra high voltage alternating current transmission line to radio station |
| CN203203611U (en) * | 2013-04-18 | 2013-09-18 | 国家电网公司 | Quasi-distributed high voltage transmission line optical fiber monitoring network |
| CN104917127A (en) * | 2014-03-11 | 2015-09-16 | 国家电网公司 | Method for reducing passive interference of high-tension transmission line in low frequency band |
| CN105262081A (en) * | 2015-06-01 | 2016-01-20 | 三峡大学 | Method for predicting passive interference resonant frequency of short-wave frequency band of ultra-high voltage transmission line |
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- 2018-08-29 CN CN201810997200.7A patent/CN109193620B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340357A (en) * | 2011-09-16 | 2012-02-01 | 国网电力科学研究院 | Method for reducing passive jamming of ultra high voltage alternating current transmission line to radio station |
| CN203203611U (en) * | 2013-04-18 | 2013-09-18 | 国家电网公司 | Quasi-distributed high voltage transmission line optical fiber monitoring network |
| CN104917127A (en) * | 2014-03-11 | 2015-09-16 | 国家电网公司 | Method for reducing passive interference of high-tension transmission line in low frequency band |
| CN105262081A (en) * | 2015-06-01 | 2016-01-20 | 三峡大学 | Method for predicting passive interference resonant frequency of short-wave frequency band of ultra-high voltage transmission line |
Non-Patent Citations (1)
| Title |
|---|
| 论输电线路布线方案选择及实施;梁华浮;《电力建设》;20080831(第194期);第115-117页 * |
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