CN103078318A - Overvoltage improvement method on basis of historical data of overhead power transmission line - Google Patents

Overvoltage improvement method on basis of historical data of overhead power transmission line Download PDF

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Publication number
CN103078318A
CN103078318A CN2013100067276A CN201310006727A CN103078318A CN 103078318 A CN103078318 A CN 103078318A CN 2013100067276 A CN2013100067276 A CN 2013100067276A CN 201310006727 A CN201310006727 A CN 201310006727A CN 103078318 A CN103078318 A CN 103078318A
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overvoltage
phase
same period
switching
breaker
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CN2013100067276A
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CN103078318B (en
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郭洁
项阳
温定筠
吕景顺
马建海
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Xian Jiaotong University
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Xian Jiaotong University
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Abstract

The invention discloses an overvoltage improvement method on the basis of historical data of an overhead power transmission line, which is mainly characterized in that a flashover frequency section of the power transmission line is selected on the basis of the historical data; and according to a line transposition mode, a structural size of a tower and types and structural sizes of a wire and an overhead ground wire which are selected by the power transmission line, resistances, inductances and capacitances of a zero sequence and a positive sequence of the line are calculated by utilizing electromagnetic transient analysis, so that by integrating overvoltage calculations in various operating modes, one method for improving an overvoltage is disclosed and a corresponding strategy is called in a targeted manner, and thus, the overvoltage improvement method is beneficial for implementing differentiation design of the line.

Description

A kind of overvoltage improvement method based on the overhead transmission line historical data
Technical field
The invention belongs to power grid transmission line road technique field, relate to a kind of overvoltage improvement method of overhead transmission line.
Background technology
In recent years, the insulator arc-over trip accident repeatedly occurs in the transmission line of interior each electric pressure of electrical network especially Northwest Grid, and the mains supply reliability has been caused significant impact, and economic loss is very large; According to the flashover fault analysis, the filth that insulator surface is assembled is the one of the main reasons that causes flashover, in view of randomness, mutability and many influencing factors characteristics of filth, so the calculating of the line over-voltage particular importance that just seems.For the similar achievement in research of the transmission line of high height above sea level, long distance, cross-regional complexity seldom, also do not have so far complete, the rational overvoltage improvement method of a cover to successfully manage the transmission line insulator flashover accident, the operation of transmission line exists great potential safety hazard.
Summary of the invention
The technical problem to be solved in the present invention is how effectively to utilize the overhead transmission line historical data, comprise flashover data and steady state data, propose a kind ofly be used to improving superpotential method, so that call with a definite target in view corresponding strategy, thereby be conducive to realize the design of circuit differentiation.
The invention discloses a kind of overvoltage improvement method based on the overhead transmission line historical data, it is characterized in that:
1. choose the flashover section of taking place frequently of described transmission line based on historical data, physical dimension according to circuit transposition form, shaft tower, and the wire selected of transmission line and model and the physical dimension thereof of overhead ground wire, utilize electromagnetic transient analysis to come resistance, the inductance of computational scheme zero sequence and positive sequence and electric capacity;
2. calculate the parameter of power supply, comprising: three-phase and the single-phase short circuit current of circuit transmission capacity, load side power factor, transformer station, and the equivalent positive sequence impedance of transformer station and equivalent negative sequence impedance;
If 3. the circuit head and end is equipped with high-voltage shunt reactor, obtain so the shunt reactor parameter, comprising: rated voltage, rated capacity, and when operation compensativity;
4. obtain circuit breaker parameters, comprising: breaker closing resistance, turn-on time, combined floodgate three-phase not the same period time upper limit value, and the separating brake three-phase not the same period time upper limit value;
5. obtain the lightning arrester parameter in the circuit;
6. calculate power frequency steady state voltage fiducial value, power-frequency overvoltage fiducial value, and the switching overvoltage fiducial value;
7. based on historical data, stable state phase-ground voltage and stable state phase-phase voltage during the normal steady operation of computational scheme, when transmission line first and last section is normally moved, and computational scheme phase-ground voltage along the line distribute with circuit mutually-phase voltage distributes along the line;
8. finish on the basis of aforementioned each step simulation calculation power-frequency overvoltage, switching overvoltage, and lightning overvoltage;
9. according to aforementioned each step result of calculation, the staff carries out suitable overvoltage and improves strategy.
Embodiment
The invention discloses a kind of overvoltage improvement method based on the overhead transmission line historical data, it is characterized in that:
1. choose the flashover section of taking place frequently of described transmission line based on historical data, physical dimension according to circuit transposition form, shaft tower, and the wire selected of transmission line and model and the physical dimension thereof of overhead ground wire, utilize electromagnetic transient analysis to come resistance, the inductance of computational scheme zero sequence and positive sequence and electric capacity;
2. calculate the parameter of power supply, comprising: three-phase and the single-phase short circuit current of circuit transmission capacity, load side power factor, transformer station, and the equivalent positive sequence impedance of transformer station and equivalent negative sequence impedance;
If 3. the circuit head and end is equipped with high-voltage shunt reactor, obtain so the shunt reactor parameter, comprising: rated voltage, rated capacity, and when operation compensativity;
4. obtain circuit breaker parameters, comprising: breaker closing resistance, turn-on time, combined floodgate three-phase not the same period time upper limit value, and the separating brake three-phase not the same period time upper limit value;
5. obtain the lightning arrester parameter in the circuit;
6. calculate power frequency steady state voltage fiducial value, power-frequency overvoltage fiducial value, and the switching overvoltage fiducial value;
7. based on historical data, stable state phase-ground voltage and stable state phase-phase voltage during the normal steady operation of computational scheme, when transmission line first and last section is normally moved, and computational scheme phase-ground voltage along the line distribute with circuit mutually-phase voltage distributes along the line;
8. finish on the basis of aforementioned each step simulation calculation power-frequency overvoltage, switching overvoltage, and lightning overvoltage;
9. according to aforementioned each step result of calculation, the staff carries out suitable overvoltage and improves strategy.
Based on above-described embodiment, those skilled in the art can its Technology Ways of complete understanding, the characteristics of this technical scheme are: from historical data, effectively utilize historical data, formed one complete, can be so that the staff calls or carries out the method that corresponding overvoltage is improved strategy with a definite target in view.Above-described embodiment novelty is calculated all multi-parameters, distribution along the line and multiple overvoltage with being and is carried out combination, thereby formed be different from prior art, comprise the overvoltage improvement method of many kinds of parameters as far as possible, be conducive to the overvoltage that the staff considers conventional various character and improve strategy to tackle targetedly concrete condition.The linking of this technical scheme by each step formed that one complete, organically technical scheme is used for the practical problem of technical solution, thereby can efficiently solve existing problem and the potential problems of the safety issue, particularly overvoltage aspect of circuit.
In another embodiment; the overvoltage in above-mentioned the 9th step is improved tactful arbitrary or its combination that comprises in the following strategy: change the shunt reactor configuration parameter, change the circuit breaker configuration parameter, change insulator creep distance or sheet number, improve Insulators Used, reduce pole tower ground resistance, reduce the ground wire shielding angle, install leakage conductor additional, strengthen ground shield, set up the bypass ground wire, set up coupling ground wire.Those skilled in the art are not difficult to find, embodiment purpose herein is the result of calculation that foundation is concrete, and the alternative overvoltage of refinement is improved strategy, such as the reasonable disposition lightning arrester.
In another embodiment, in above-mentioned the 8th step, the calculating of power-frequency overvoltage comprises that the voltage along the line under the following multiple operational mode distributes: the operational mode of the operational mode of circuit breaker three-phase symmetrical separating brake, line end generation single-phase earthing, the operational mode of line end generation two phase ground, line end generation two-phase phase fault.With regard to this embodiment, its purpose be the calculating of refinement power-frequency overvoltage related more the next, the voltage along the line under the operational mode distributes more specifically.With regard to this embodiment, it has considered many factors, and passes through the historical data data in conjunction with long-time running, thereby draws the surge characteristic of transmission line under the specific multiple operational mode.
In another embodiment, in above-mentioned the 8th step, the calculating of switching overvoltage comprises that the overvoltage under the following multiple mode of operation calculates: do not calculate, the overvoltage under the single-phase circuit breaker reclosing operation mode is calculated by the overvoltage under the closing operation mode same period for three-phase breaker, three-phase breaker not the overvoltage under the sub-switching operation mode same period calculate, with the single-phase earthing three-phase breaker not the overvoltage under the sub-switching operation mode same period calculate.With regard to this embodiment, its purpose be the superpotential calculating of Refinement operation related more the next, the overvoltage under the operational mode is calculated more specifically.
In another embodiment, above-mentioned three-phase breaker not the overvoltage under the closing operation mode same period calculate and comprise: three-phase not the same period closing operation statistical overvoltage calculate, three-phase the maximum overvoltage of the closing operation same period calculate.With regard to this embodiment, its purpose be the refinement three-phase breaker not the overvoltage under the closing operation mode same period calculate.
In another embodiment, the overvoltage under the above-mentioned single-phase circuit breaker reclosing operation mode is calculated and comprised: 2% single-pole reclosing operates maximum statistical overvoltage calculating, single-pole reclosing operates maximum overvoltage and calculates.With regard to this embodiment, its purpose is the overvoltage calculating under the refinement single-phase circuit breaker reclosing operation mode.
In another embodiment, above-mentioned three-phase breaker not the overvoltage under the sub-switching operation mode same period calculate and comprise: 2% three-phase the maximum statistical overvoltage of the sub-switching operation same period calculate, three-phase the maximum overvoltage of the sub-switching operation same period calculate.With regard to this embodiment, its purpose be the refinement three-phase breaker not the overvoltage under the sub-switching operation mode same period calculate.
In another embodiment, above-mentioned with the single-phase earthing three-phase breaker not the overvoltage under the sub-switching operation mode same period calculate and comprise: 2% band earth fault three-phase breaker not the maximum statistical overvoltage of the sub-switching operation same period, band earth fault three-phase breaker the maximum overvoltage of the sub-switching operation same period calculate.With regard to this embodiment, its purpose be refinement band single-phase earthing three-phase breaker not the overvoltage under the sub-switching operation mode same period calculate.
In another embodiment, in above-mentioned the 8th step, the calculating of lightning overvoltage comprises: calculate a year thunderstorm day according to the historical thunderstorm data of height above sea level and their location.With regard to this embodiment, its purpose is effectively to utilize the historical thunderstorm data under certain height above sea level condition, to improve the calculating of lightning overvoltage.This technical scheme is more useful for the large circuit of altitude change scope.
In another embodiment, in above-mentioned the 8th step, the calculating of lightning overvoltage comprises: with reference to above-mentioned year thunderstorm day, carry out back flashover calculating and thunderbolt and calculate.With regard to this embodiment, its purpose is based on height above sea level, historical data, the further calculating of refinement lightning overvoltage.
In another embodiment, the shaft tower during back flashover calculates adopts multi-wave impedance model.With regard to this embodiment, its purpose is specifically to select the Tower Model of back flashover in calculating.
Wherein, the shaft tower during thunderbolt calculates adopts the cat head Tower Model.With regard to this embodiment, its purpose is specifically to select the Tower Model of thunderbolt in calculating.
Certainly, for the multiple operational mode of above each embodiment, trace it to its cause, no matter be from existing theory or the angle of practical experience, it is relevant with the fault that overvoltage in the reality may cause, so the related simulation calculation of embodiments of the invention has been considered all multi-operating conditions.
It should be noted that at last: above embodiment is only in order to illustrate the present invention and unrestricted technical scheme described in the invention; Therefore although this specification has been described in detail the present invention with reference to each above-mentioned embodiment, it will be understood by those of skill in the art that still and can make amendment or be equal to replacement the present invention; And all do not break away from technical scheme and the improvement thereof of the spirit and scope of the present invention, and it all should be encompassed in the claim scope of the present invention.

Claims (10)

1.. the overvoltage improvement method based on the overhead transmission line historical data is characterized in that:
(1) chooses the flashover section of taking place frequently of described transmission line based on historical data, physical dimension according to circuit transposition form, shaft tower, and the wire selected of transmission line and model and the physical dimension thereof of overhead ground wire, utilize electromagnetic transient analysis to come resistance, the inductance of computational scheme zero sequence and positive sequence and electric capacity;
(2) parameter of calculating power supply comprises: three-phase and the single-phase short circuit current of circuit transmission capacity, load side power factor, transformer station, and the equivalent positive sequence impedance of transformer station and equivalent negative sequence impedance;
(3) if the circuit head and end is equipped with high-voltage shunt reactor, obtain so the shunt reactor parameter, comprising: rated voltage, rated capacity, and when operation compensativity;
(4) obtain circuit breaker parameters, comprising: breaker closing resistance, turn-on time, combined floodgate three-phase not the same period time upper limit value, and the separating brake three-phase not the same period time upper limit value;
(5) obtain lightning arrester parameter in the circuit;
(6) calculate power frequency steady state voltage fiducial value, power-frequency overvoltage fiducial value, and the switching overvoltage fiducial value;
(7) based on historical data, stable state phase-ground voltage and stable state phase-phase voltage during the normal steady operation of computational scheme, when transmission line first and last section is normally moved, and computational scheme phase-ground voltage along the line distribute with circuit mutually-phase voltage distributes along the line;
(8) finish on the basis of aforementioned each step simulation calculation power-frequency overvoltage, switching overvoltage, and lightning overvoltage;
(9) according to aforementioned each step result of calculation, the staff carries out suitable overvoltage and improves strategy.
2. method according to claim 1; it is characterized in that: the overvoltage in above-mentioned the 9th step is improved tactful arbitrary or its combination that comprises in the following strategy: change the shunt reactor configuration parameter, change the circuit breaker configuration parameter, change insulator creep distance or sheet number, improve Insulators Used, reduce pole tower ground resistance, reduce the ground wire shielding angle, install leakage conductor additional, strengthen ground shield, set up the bypass ground wire, set up coupling ground wire.
3. method according to claim 1, it is characterized in that: in above-mentioned the 8th step, the calculating of power-frequency overvoltage comprises that the voltage along the line under the following multiple operational mode distributes: the operational mode of the operational mode of circuit breaker three-phase symmetrical separating brake, line end generation single-phase earthing, the operational mode of line end generation two phase ground, line end generation two-phase phase fault.
4. according to claim 1 to 3 arbitrary described methods, it is characterized in that: in above-mentioned the 8th step, the calculating of switching overvoltage comprises that the overvoltage under the following multiple mode of operation calculates: do not calculate, the overvoltage under the single-phase circuit breaker reclosing operation mode is calculated by the overvoltage under the closing operation mode same period for three-phase breaker, three-phase breaker not the overvoltage under the sub-switching operation mode same period calculate, with the single-phase earthing three-phase breaker not the overvoltage under the sub-switching operation mode same period calculate.
5. arbitrary described method according to claim 4 is characterized in that: the above-mentioned three-phase breaker not overvoltage under the closing operation mode same period calculates and comprises: three-phase not the same period closing operation statistical overvoltage calculate, three-phase the maximum overvoltage of the closing operation same period calculate.
6. method according to claim 4 is characterized in that: the overvoltage under the above-mentioned single-phase circuit breaker reclosing operation mode is calculated and comprised: 2% single-pole reclosing operates that maximum statistical overvoltage calculates, single-pole reclosing operates maximum overvoltage and calculates.
7. method according to claim 4 is characterized in that: the above-mentioned three-phase breaker not overvoltage under the sub-switching operation mode same period calculates and comprises: 2% three-phase the maximum statistical overvoltage of the sub-switching operation same period calculate, three-phase the maximum overvoltage of the sub-switching operation same period calculate.
8. according to claim 4 to 7 arbitrary described methods, it is characterized in that: above-mentioned with the single-phase earthing three-phase breaker not the overvoltage under the sub-switching operation mode same period calculate and comprise: 2% band earth fault three-phase breaker not the maximum statistical overvoltage of the sub-switching operation same period, band earth fault three-phase breaker the maximum overvoltage of the sub-switching operation same period calculate.
9. method according to claim 4 is characterized in that: in above-mentioned the 8th step, the calculating of lightning overvoltage comprises: calculate a year thunderstorm day according to the historical thunderstorm data of height above sea level and their location.
10. method according to claim 9, it is characterized in that: in above-mentioned the 8th step, the calculating of lightning overvoltage comprised: with reference to above-mentioned year thunderstorm day, carrying out back flashover calculating and thunderbolt calculates, and the shaft tower during back flashover calculates adopts multi-wave impedance model, and the shaft tower during thunderbolt calculates adopts the cat head Tower Model.
CN201310006727.6A 2013-01-09 2013-01-09 Overvoltage improvement method on basis of historical data of overhead power transmission line Expired - Fee Related CN103078318B (en)

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Publication number Priority date Publication date Assignee Title
CN103474998A (en) * 2013-08-23 2013-12-25 江苏省电力设计院 500kV cable and overhead joint line overvoltage optimization control method
CN104882871A (en) * 2015-04-22 2015-09-02 葛洲坝集团电力有限责任公司 Protection method of wind farm cable closing overvoltage
CN108362977A (en) * 2018-02-09 2018-08-03 中国电力科学研究院有限公司 A kind of super UHV Transmission Engineering line fault origin cause of formation discriminating conduct and system
CN110378021A (en) * 2019-07-19 2019-10-25 华北电力大学 A kind of transmission line of electricity emulation mode and system

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CN102074948A (en) * 2011-01-20 2011-05-25 清华大学 System for limiting overvoltage in ultrahigh-voltage alternating current power transmission system
CN102680834A (en) * 2012-05-30 2012-09-19 广东电网公司佛山供电局 Method and device for evaluating induction lightning protection range of low-voltage distribution line arrester
CN102694352A (en) * 2012-06-07 2012-09-26 甘肃省电力公司电力科学研究院 Method for improving insulator potential distribution in overhead power transmission line

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CN101272040A (en) * 2008-04-28 2008-09-24 华北电力科学研究院有限责任公司 Method for electric power line lightning protection configuration by using electric network lightning disturbance distribution
CN102074948A (en) * 2011-01-20 2011-05-25 清华大学 System for limiting overvoltage in ultrahigh-voltage alternating current power transmission system
CN102680834A (en) * 2012-05-30 2012-09-19 广东电网公司佛山供电局 Method and device for evaluating induction lightning protection range of low-voltage distribution line arrester
CN102694352A (en) * 2012-06-07 2012-09-26 甘肃省电力公司电力科学研究院 Method for improving insulator potential distribution in overhead power transmission line

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103474998A (en) * 2013-08-23 2013-12-25 江苏省电力设计院 500kV cable and overhead joint line overvoltage optimization control method
CN104882871A (en) * 2015-04-22 2015-09-02 葛洲坝集团电力有限责任公司 Protection method of wind farm cable closing overvoltage
CN108362977A (en) * 2018-02-09 2018-08-03 中国电力科学研究院有限公司 A kind of super UHV Transmission Engineering line fault origin cause of formation discriminating conduct and system
CN108362977B (en) * 2018-02-09 2021-07-16 中国电力科学研究院有限公司 Method and system for identifying fault cause of line in ultra-high voltage transmission project
CN110378021A (en) * 2019-07-19 2019-10-25 华北电力大学 A kind of transmission line of electricity emulation mode and system
CN110378021B (en) * 2019-07-19 2020-05-01 华北电力大学 Power transmission line simulation method and system

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