CN103078318B - 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 PDFInfo
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- CN103078318B CN103078318B CN201310006727.6A CN201310006727A CN103078318B CN 103078318 B CN103078318 B CN 103078318B CN 201310006727 A CN201310006727 A CN 201310006727A CN 103078318 B CN103078318 B CN 103078318B
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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
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, repeatedly there is insulator arc-over trip accident in the transmission line of interior each electric pressure of electrical network especially Northwest Grid, mains supply reliability has been caused to significant impact, and economic loss is very large; According to flashover fault analysis, the filth that insulator surface is assembled is the one of the main reasons that causes flashover, in view of filthy randomness, mutability and many influencing factors feature, 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 there is no so far a set of complete, rational overvoltage improvement method to successfully manage 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 overhead transmission line historical data, comprise flashover data and steady state data, propose a kind ofly for improving superpotential method, make to 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 overhead transmission line historical data, it is characterized in that:
1. based on historical data, choose the flashover section of taking place frequently of described transmission line, according to the physical dimension of 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. the parameter of calculating 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. circuit head and end is provided with high-voltage shunt reactor, obtain so 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 separating brake three-phase not the same period time upper limit value;
5. obtain the lightning arrester parameter in circuit;
6. calculate power frequency steady state voltage fiducial value, power-frequency overvoltage fiducial value, and switching overvoltage fiducial value;
7. based on historical data, during the normal steady operation of computational scheme, transmission line first and last section stable state phase-ground voltage and stable state phase-phase voltage while normally moving, and computational scheme phase-ground voltage is along the line distributes and circuit phase-phase voltage distributes along the line;
8. complete 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, staff carries out suitable overvoltage and improves strategy.
Embodiment
The invention discloses a kind of overvoltage improvement method based on overhead transmission line historical data, it is characterized in that:
1. based on historical data, choose the flashover section of taking place frequently of described transmission line, according to the physical dimension of 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. the parameter of calculating 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. circuit head and end is provided with high-voltage shunt reactor, obtain so 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 separating brake three-phase not the same period time upper limit value;
5. obtain the lightning arrester parameter in circuit;
6. calculate power frequency steady state voltage fiducial value, power-frequency overvoltage fiducial value, and switching overvoltage fiducial value;
7. based on historical data, during the normal steady operation of computational scheme, transmission line first and last section stable state phase-ground voltage and stable state phase-phase voltage while normally moving, and computational scheme phase-ground voltage is along the line distributes and circuit phase-phase voltage distributes along the line;
8. complete 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, 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 feature of this technical scheme is: from historical data, effectively utilize historical data, formed one complete, can make staff call with a definite target in view or carry out corresponding overvoltage and improve tactful method.Above-described embodiment novelty is all multi-parameters, distribution along the line and multiple overvoltage to calculate and carry out combination, thereby formed, be different from overvoltage improvement method prior art, that comprise many kinds of parameters as far as possible, be conducive to the overvoltage that 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 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 of above-mentioned the 9th step is improved strategy and is comprised arbitrary or its combination in following strategy: change shunt reactor configuration parameter, change circuit breaker configuration parameter, change insulator creep distance or sheet number, improve Insulators Used, reduce pole tower ground resistance, reduce ground wire shielding angle, install leakage conductor additional, strengthen ground shield, set up bypass ground wire, set up coupling ground wire.Those skilled in the art are not difficult to find, embodiment object is herein the result of calculation that foundation is concrete, and the alternative overvoltage of refinement is improved strategy, such as 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 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 object be the calculating of refinement power-frequency overvoltage related more the next, the voltage along the line under 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 specific multiple operational mode.
In another embodiment, in above-mentioned the 8th step, the calculating of switching overvoltage comprises that overvoltage under following multiple mode of operation calculates: do not calculate, the overvoltage under 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 single-phase earthing three-phase breaker not the overvoltage under the sub-switching operation mode same period calculate.With regard to this embodiment, its object be the superpotential calculating of Refinement operation related more the next, the overvoltage under 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 object be refinement three-phase breaker not the overvoltage under the closing operation mode same period calculate.
In another embodiment, the overvoltage under above-mentioned single-phase circuit breaker reclosing operation mode is calculated and is comprised: 2% single-pole reclosing operates maximum statistical overvoltage calculating, single-pole reclosing operates maximum overvoltage and calculates.With regard to this embodiment, its object is the overvoltage calculating under 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 object be refinement three-phase breaker not the overvoltage under the sub-switching operation mode same period calculate.
In another embodiment, above-mentioned with single-phase earthing three-phase breaker not the overvoltage under the sub-switching operation mode same period calculate and comprise: 2% fault three-phase breaker with ground not the maximum statistical overvoltage of the sub-switching operation same period, fault three-phase breaker with ground the maximum overvoltage of the sub-switching operation same period calculate.With regard to this embodiment, its object 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: according to the historical thunderstorm data of height above sea level and their location, calculate a year thunderstorm day.With regard to this embodiment, its object 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 object is based on height above sea level, historical data, the further calculating of refinement lightning overvoltage.
In another embodiment, the shaft tower in back flashover calculating adopts multi-wave impedance model.With regard to this embodiment, its object is specifically to select the Tower Model in back flashover calculating.
Wherein, the shaft tower in thunderbolt calculating adopts cat head Tower Model.With regard to this embodiment, its object is specifically to select the Tower Model in thunderbolt 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, its fault that may cause with overvoltage in reality is relevant, so the related simulation calculation of embodiments of the invention has been considered all multi-operating conditions.
Finally it should be noted that: above embodiment is only in order to illustrate the present invention and unrestricted technical scheme described in the invention; Although therefore 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 modify or be equal to replacement the present invention; And all do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, it all should be encompassed in claim scope of the present invention.
Claims (9)
1. the overvoltage improvement method based on overhead transmission line historical data, is characterized in that:
(1) based on historical data, choose the flashover section of taking place frequently of described transmission line, according to the physical dimension of 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, inductance and the electric capacity of computational scheme zero sequence and positive sequence;
(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;
(3) if circuit head and end is provided with high-voltage shunt reactor, obtain so 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 separating brake three-phase not the same period time upper limit value;
(5) obtain the lightning arrester parameter in circuit;
(6) calculate power frequency steady state voltage fiducial value, power-frequency overvoltage fiducial value, and switching overvoltage fiducial value;
(7), based on historical data, during the normal steady operation of computational scheme, transmission line first and last section stable state phase-ground voltage and stable state phase-phase voltage while normally moving, and computational scheme phase-ground voltage is along the line distributes and circuit phase-phase voltage distributes along the line;
(8) complete 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, staff carries out suitable overvoltage and improves strategy;
The overvoltage of above-mentioned the 9th step is improved strategy and is comprised arbitrary or its combination in following strategy: change shunt reactor configuration parameter, change circuit breaker configuration parameter, change insulator creep distance or sheet number, improve Insulators Used, reduce pole tower ground resistance, reduce ground wire shielding angle, install leakage conductor additional, strengthen ground shield, set up bypass ground wire, set up coupling ground wire.
2. 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 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.
3. method according to claim 1 and 2, it is characterized in that: in above-mentioned the 8th step, the calculating of switching overvoltage comprises that overvoltage under following multiple mode of operation calculates: do not calculate, the overvoltage under 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 single-phase earthing three-phase breaker not the overvoltage under the sub-switching operation mode same period calculate.
4. method according to claim 3, 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.
5. method according to claim 3, is characterized in that: the overvoltage under 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.
6. method according to claim 3, 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.
7. method according to claim 3, is characterized in that: above-mentioned with single-phase earthing three-phase breaker not the overvoltage under the sub-switching operation mode same period calculate and comprise: 2% fault three-phase breaker with ground the maximum statistical overvoltage of the sub-switching operation same period calculate, fault three-phase breaker with ground the maximum overvoltage of the sub-switching operation same period calculate.
8. method according to claim 3, is characterized in that: in above-mentioned the 8th step, the calculating of lightning overvoltage comprises: according to the historical thunderstorm data of height above sea level and their location, calculate a year thunderstorm day.
9. method according to claim 8, 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, the shaft tower during thunderbolt calculates adopts cat head Tower Model.
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| CN201310006727.6A CN103078318B (en) | 2013-01-09 | 2013-01-09 | Overvoltage improvement method on basis of historical data of overhead power transmission line |
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| CN103474998B (en) * | 2013-08-23 | 2015-09-02 | 中国能源建设集团江苏省电力设计院有限公司 | 500kV cable and aerial mixed line overvoltage optimal 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 |
| 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 |
| 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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| CN101272040B (en) * | 2008-04-28 | 2010-06-09 | 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 |
| CN102694352B (en) * | 2012-06-07 | 2015-04-22 | 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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