CN104092201B - Remote ultra-high voltage alternating-current transmission line fault determination method - Google Patents
Remote ultra-high voltage alternating-current transmission line fault determination method Download PDFInfo
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Abstract
The invention discloses a remote ultra-high voltage alternating-current transmission line fault determination method. The method comprises the steps that voltage and current travelling wave components at each sampling moment at protection installation positions at the two ends of an ultra-high voltage alternating-current transmission line are collected at first, the influence of line losses is calculated, the travelling wave electrical quantity at each sampling moment is utilized for calculating the current travelling wave component at one end of the ultra-high voltage alternating-current transmission line through a prediction algorithm, then a distributed capacitance current along the ultra-high voltage alternating-current transmission line is used as a braking current, the vector sum of the current travelling wave component, obtained through calculation, at one end of the ultra-high voltage alternating-current transmission line and the current travelling wave component, obtained through sampling, at the end of the ultra-high voltage alternating-current transmission line is used as a difference current, and phase splitting is carried out to form main protection of the ultra-high voltage alternating-current transmission line. According to the remote ultra-high voltage alternating-current transmission line fault determination method, the current travelling wave components at each sampling moment does not need to be solved through interpolation operation, the operand of current travelling wave protection is reduced, the movement speed of current travelling wave differential protection is improved, and the remote ultra-high voltage alternating-current transmission line fault determination method is applicable to ultra-high voltage alternating-current transmission line replay protection under different operating environments and circuit parameters.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, concretely relate to a kind of remote extra-high-voltage alternating current
Transmission line malfunction method of discrimination.
Background technology
Due to not affected and being had natural phase-selecting function, current differential protection one by system operation mode and electric network composition
It is directly the main protection of various electric pressure transmission lines of electricity.In 220kV and following electric pressure transmission line of electricity, due to transmission line of electricity
Capacitance current very little along the line, distribution capacity affects very little to current differential protection performance.However, extra-high-voltage alternating current is defeated
The voltage of electric line, electric current transmission have obvious wave process, and capacitance current along the line is very big, using two ends fundamental frequency stable state electricity
The amplitude of the vector of flow component is faced with current differential protection starting current greatly as the conventional current differential protection of actuating quantity,
And in order to prevent false protection, improving startup setting value can lead to protection sensitivity not enough again, govern the differential guarantor of conventional current
Application on ultrahigh voltage alternating current transmission lines for the shield.
Consider the impact of distribution capacity, performance based on distributed parameter model transmission line of electricity current differential protection algorithm
Do not affected by capacitance current, but need to design the hyperbolic functions computing of large amount of complex, hyperbolic functions are in microcomputer code
It is difficult to realize, practical difficult.Traveling-wave differential protection considers the impact of distribution capacity in protection algorism Mathematical Modeling, and traveling wave is poor
Do not affected by transmission line of electricity distribution capacity on dynamic protection philosophy, be there is very high performance.Application number
200910034669.1 patent of invention " being applied to the traveling-wave differential protection method of series capacitor compensated line " solves distribution electricity
Hold the impact to differential protection performance, but logical for, when traveling wave propagation delay is the non-integral multiple sampling interval, needing
Cross the electric parameters that interpolation arithmetic obtains in Each point in time, the requirement to protection device sample frequency is very high, therefore to protection
Device hardware requirement is very high, and each sampling instant will carry out interpolation arithmetic, the required operand of protection algorism itself big it is impossible to
Meet the requirement of protection quick-action.Su Bin, Dong Xinzhou and Sun Yuan Zhang Fabiao's《The traveling wave of UHV Transmission Line with Shunt Reactor is poor
Dynamic protection》And Su Bin, Dong Xinzhou and Sun Yuan Zhang Fabiao《Traveling-wave differential protection based on wavelet transformation》And application number
200410079501.X patent of invention " detection method of voltage zero cross near fault in travelling wave protection " is for traveling wave propagation delay
Situation for the non-integral multiple sampling interval is also required to obtain the electric parameters in Each point in time by interpolation arithmetic, equally exists
The big problem of operand；Need to carry out wavelet transformation, desired data window is big, protection detects fault and occurs required time long.
At present, the transmission line travelling wave differential protecting method that many scholars have pointed out is non-integral multiple to traveling wave propagation delay
The situation in sampling interval is required for carrying out interpolation arithmetic and asks electric parameters in its Each point in time, protection algorism operand itself
Greatly, protection device sampling hardware is had high demands.Wherein part transmission line travelling wave differential protecting method even needs to carry out small echo
Conversion, desired data window is big, extends and protects time fault generation is detected it is impossible to meet relay protection, quick-action to be wanted
Ask.
Content of the invention
It is an object of the invention to overcoming the shortcomings of that prior art exists, provide a kind of remote ultra-high voltage AC transmission line
Road fault distinguishing method.The inventive method need not ask for the current traveling wave component of each sampling instant by interpolation arithmetic, decreases
Current traveling wave protects operand, improves current traveling wave differential protection responsiveness.The inventive method utilizes extra-high-voltage alternating current defeated
Electric line capacitance current along the line, as stalling current, need not carry out electric current threshold value and adjust, can be defeated with extra-high-voltage alternating current
Electric line distance, over the ground distributed capacitance parameter change and change it is adaptable to the extra-high voltage of various running environment and line parameter circuit value is handed over
Stream relay protection of transmission line.
The present invention adopts the following technical scheme that：
Remote ultrahigh voltage alternating current transmission lines fault distinguishing method, including following sequential steps：
(1) install using positioned at the m transforming plant protecting installation place at ultrahigh voltage alternating current transmission lines two ends and n transforming plant protecting
The traveling wave electric amount of each sampling instant at place calculates the 0 of the m transforming plant protecting installation place of t sampling instant, α, β mould current traveling wave and divides
Amount i 'm0(t)、i′mα(t)、i′mβ(t)：
Wherein, t is sampling instant；L is to connect m transformer station and n transformer station
Ultrahigh voltage alternating current transmission lines length；T is the cycle time of fundamental component；Zc0、Zcα、ZcβIt is respectively ultra-high voltage AC transmission line
Road 0, the characteristic impedance of α, β line wave component；νc0、νcα、νcβIt is respectively ultrahigh voltage alternating current transmission lines 0, α, β line wave component
Spread speed；ω is power system angular frequency；R0、Rα、RβIt is respectively ultrahigh voltage alternating current transmission lines 0, α, β line wave component
Resistance；um0(t)、umα(t)、umβT () is respectively the 0 of the t sampling instant of m transforming plant protecting installation place, the voltage row of α, β mould
Wave component；un0(t)、unα(t)、unβT () is respectively the 0 of the t sampling instant of n transforming plant protecting installation place, the voltage row of α, β mould
Wave component；in0(t)、inα(t)、inβT () is respectively the 0 of the t sampling instant of n transforming plant protecting installation place, the electric current row of α, β mould
Wave component； It is respectively m transforming plant protecting installation placeSampling instant
0th, the voltage traveling wave component of α, β mould；It is respectively n transforming plant protecting installation placeThe 0 of sampling instant, the voltage traveling wave component of α, β mould；It is respectively m power transformation
Stand and protect installation placeThe 0 of sampling instant, the current traveling wave component of α, β mould；
It is respectively n transforming plant protecting installation placeThe 0 of sampling instant, the current traveling wave component of α, β mould；
(7) by i 'm0(t)、i′mα(t)、i′mβT () carries out the m transforming plant protecting peace that phase mould inverse transformation obtains t sampling instant
Three-phase current traveling-wave component i ' at dressmA(t)、i′mB(t)、i′mC(t)；To i 'mA(t)、i′mB(t)、i′mCT () adopts Fourier
Algorithm calculates the three-phase Fundamental-frequency Current component of the t sampling instant of m transforming plant protecting installation place
(8) the current traveling wave component i to the three-phase actual measurement of the m transforming plant protecting installation place of t sampling instantmA(t)、imB
(t)、imCT Fundamental-frequency Current that () calculates the three-phase actual measurement of the t sampling instant of m transforming plant protecting installation place using Fourier algorithm divides
Amount
(9) the current traveling wave component i to the three-phase actual measurement of the n transforming plant protecting installation place of t sampling instantnA(t)、inB
(t)、inCT Fundamental-frequency Current that () calculates the three-phase actual measurement of the t sampling instant of n transforming plant protecting installation place using Fourier algorithm divides
Amount
(10) judge t sampling instantWhether set up, if so, then judge A phase extra-high voltage
Break down in transmission line of alternation current, the breaker at tripping A phase ultrahigh voltage alternating current transmission lines two ends；
(11) judge t sampling instantWhether set up, if so, then judge B phase extra-high voltage
Break down in transmission line of alternation current, the breaker at tripping B phase ultrahigh voltage alternating current transmission lines two ends；
(7) judge t sampling instantWhether set up, if so, then judge C phase extra-high voltage
Break down in transmission line of alternation current, the breaker at tripping C phase ultrahigh voltage alternating current transmission lines two ends.
The present invention compared with prior art, has following positive achievement：
When the integral multiple that transmission time on ultrahigh voltage alternating current transmission lines for the traveling-wave component is not sampling interval duration,
The inventive method need not ask for the current traveling wave component of each sampling instant by interpolation arithmetic, decreases current traveling wave protection computing
Amount, improves current traveling wave differential protection responsiveness.The inventive method is distributed electricity along the line using ultrahigh voltage alternating current transmission lines
Capacitance current as stalling current, without setting current threshold value, can with ultrahigh voltage alternating current transmission lines length, over the ground be distributed electricity
Hold Parameters variation and change it is adaptable to the ultrahigh voltage alternating current transmission lines relay protection of different running environment and line parameter circuit value.This
Inventive method need not be related to the hyperbolic functions computing of complexity, and amount of calculation is little, fast operation, protection act speed fast it is adaptable to
Realize ultrahigh voltage alternating current transmission lines main protection function.
Brief description
Fig. 1 is the ultra-high voltage AC transmission system schematic of application the inventive method.
Specific embodiment
Below according to Figure of description, technical scheme is expressed in further detail.
Fig. 1 is the ultra-high voltage AC transmission system schematic of application the inventive method.The present embodiment gathers extra-high voltage first
The three-phase voltage traveling-wave component of each sampling instant in m transforming plant protecting installation place for the transmission line of alternation current and three-phase current traveling wave
Component；The three-phase voltage traveling wave of collection each sampling instant in n transforming plant protecting installation place for the ultrahigh voltage alternating current transmission lines is divided
Amount and three-phase current traveling-wave component.
Using phase-model transformation by the three-phase voltage traveling-wave component of each sampling instant of m, n transforming plant protecting installation place, three
Phase current traveling-wave component is converted into 0, α, β mode voltage traveling-wave component and 0, α, β mould current traveling wave component.
Using positioned at the m transforming plant protecting installation place at ultrahigh voltage alternating current transmission lines two ends and n transforming plant protecting installation place
Each sampling instant traveling wave electric amount calculate t sampling instant m transforming plant protecting installation place 0, α, β mould current traveling wave component
i′m0(t)、i′mα(t)、i′mβ(t)：
Wherein, t is sampling instant；L is to connect m transformer station and n transformer station
Ultrahigh voltage alternating current transmission lines length；T is the cycle time of fundamental component；Zc0、Zcα、ZcβIt is respectively ultra-high voltage AC transmission line
Road 0, the characteristic impedance of α, β line wave component；νc0、νcα、νcβIt is respectively ultrahigh voltage alternating current transmission lines 0, α, β line wave component
Spread speed；ω is power system angular frequency；R0、Rα、RβIt is respectively ultrahigh voltage alternating current transmission lines 0, α, β line wave component
Resistance；um0(t)、umα(t)、umβT () is respectively the 0 of the t sampling instant of m transforming plant protecting installation place, the voltage row of α, β mould
Wave component；im0(t)、imα(t)、imβT () is respectively the 0 of the t sampling instant of m transforming plant protecting installation place, the electric current row of α, β mould
Wave component；un0(t)、unα(t)、unβT () is respectively the 0 of the t sampling instant of n transforming plant protecting installation place, the voltage row of α, β mould
Wave component；in0(t)、inα(t)、inβT () is respectively the 0 of the t sampling instant of n transforming plant protecting installation place, the electric current row of α, β mould
Wave component；It is respectively m transforming plant protecting installation placeSampling instant
0th, the voltage traveling wave component of α, β mould；It is respectively n transforming plant protecting installation placeThe 0 of sampling instant, the voltage traveling wave component of α, β mould； It is respectively m transformer station
Protection installation placeThe 0 of sampling instant, the current traveling wave component of α, β mould；
It is respectively n transforming plant protecting installation placeThe 0 of sampling instant, the current traveling wave component of α, β mould.
By i 'm0(t)、i′mα(t)、i′mβT () carries out the m transforming plant protecting installation place that phase mould inverse transformation obtains t sampling instant
Three-phase current traveling-wave component i 'mA(t)、i′mB(t)、i′mC(t).
To i 'mA(t)、i′mB(t)、i′mCT () adopts Fourier algorithm to calculate the t sampling instant of m transforming plant protecting installation place
Three-phase Fundamental-frequency Current component
Current traveling wave component i to the three-phase actual measurement of the m transforming plant protecting installation place of t sampling instantmA(t)、imB(t)、imC
T () adopts Fourier algorithm to calculate the Fundamental-frequency Current component of the three-phase actual measurement of the t sampling instant of m transforming plant protecting installation place
Current traveling wave component i to the three-phase actual measurement of the n transforming plant protecting installation place of t sampling instantnA(t)、inB(t)、inC
T () adopts Fourier algorithm to calculate the Fundamental-frequency Current component of the three-phase actual measurement of the t sampling instant of n transforming plant protecting installation place
Judge t sampling instantWhether set up, if so, then judge A phase extra-high-voltage alternating current
Transmission line of electricity breaks down, the breaker at tripping A phase ultrahigh voltage alternating current transmission lines two ends；
Judge t sampling instantWhether set up, if so, then judge B phase extra-high-voltage alternating current
Transmission line of electricity breaks down, the breaker at tripping B phase ultrahigh voltage alternating current transmission lines two ends；
Judge t sampling instantWhether set up, if so, then judge C phase extra-high-voltage alternating current
Transmission line of electricity breaks down, the breaker at tripping C phase ultrahigh voltage alternating current transmission lines two ends.
When the integral multiple that transmission time on ultrahigh voltage alternating current transmission lines for the traveling-wave component is not sampling interval duration,
The inventive method need not ask for the current traveling wave component of each sampling instant by interpolation arithmetic, decreases current traveling wave protection computing
Amount, improves current traveling wave differential protection responsiveness.The inventive method is distributed electricity along the line using ultrahigh voltage alternating current transmission lines
Capacitance current as stalling current, without setting current threshold value, can with ultrahigh voltage alternating current transmission lines length, over the ground be distributed electricity
Hold Parameters variation and change it is adaptable to the ultrahigh voltage alternating current transmission lines relay protection of different running environment and line parameter circuit value.This
Inventive method need not be related to the hyperbolic functions computing of complexity, and amount of calculation is little, and fast operation is it is adaptable to realize extra-high-voltage alternating current defeated
Electric line main protection function.
The foregoing is only the preferred embodiment of the present invention, but protection scope of the present invention is not limited thereto, appoint
What those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in, all
Should be included within the scope of the present invention.
Claims (1)
1. remote ultrahigh voltage alternating current transmission lines fault distinguishing method is it is characterised in that include following sequential steps：
(1) using positioned at the m transforming plant protecting installation place at ultrahigh voltage alternating current transmission lines two ends and n transforming plant protecting installation place
The traveling wave electric amount of each sampling instant calculates the 0 of the m transforming plant protecting installation place of t sampling instant, α, β mould current traveling wave component
i′m0(t)、i′mα(t)、i′mβ(t)：
Wherein, t is sampling instant；L is connect m transformer station and n transformer station extra-high
Pressure transmission line of alternation current length；T is the cycle time of fundamental component；Zc0、Zcα、ZcβBe respectively ultrahigh voltage alternating current transmission lines 0,
The characteristic impedance of α, β line wave component；vc0、vcα、vcβIt is respectively ultrahigh voltage alternating current transmission lines 0, the biography of α, β line wave component
Broadcast speed；ω is power system angular frequency；R0、Rα、RβIt is respectively ultrahigh voltage alternating current transmission lines 0, the electricity of α, β line wave component
Resistance；um0(t)、umα(t)、umβT () is respectively the 0 of the t sampling instant of the m transforming plant protecting installation place, voltage traveling wave of α, β mould and divides
Amount；un0(t)、unα(t)、unβT () is respectively the 0 of the t sampling instant of the n transforming plant protecting installation place, voltage traveling wave of α, β mould and divides
Amount；in0(t)、inα(t)、inβT () is respectively the 0 of the t sampling instant of the n transforming plant protecting installation place, current traveling wave of α, β mould and divides
Amount；It is respectively m transforming plant protecting installation placeThe 0 of sampling instant, α,
The voltage traveling wave component of β mould； It is respectively n transforming plant protecting installation placeAdopt
The 0 of the sample moment, the voltage traveling wave component of α, β mould；It is respectively m transforming plant protecting
Installation placeThe 0 of sampling instant, the current traveling wave component of α, β mould；It is respectively
N transforming plant protecting installation placeThe 0 of sampling instant, the current traveling wave component of α, β mould；
(2) by i 'm0(t)、i′mα(t)、i′mβT () carries out the m transforming plant protecting installation place that phase mould inverse transformation obtains t sampling instant
Three-phase current traveling-wave component i 'mA(t)、i′mB(t)、i′mC(t)；To i 'mA(t)、i′mB(t)、i′mCT () adopts Fourier algorithm
Calculate the three-phase Fundamental-frequency Current component of the t sampling instant of m transforming plant protecting installation place
(3) the current traveling wave component i to the three-phase actual measurement of the m transforming plant protecting installation place of t sampling instantmA(t)、imB(t)、imC
T () adopts Fourier algorithm to calculate the Fundamental-frequency Current component of the three-phase actual measurement of the t sampling instant of m transforming plant protecting installation place
(4) the current traveling wave component i to the three-phase actual measurement of the n transforming plant protecting installation place of t sampling instantnA(t)、inB(t)、inC
T () adopts Fourier algorithm to calculate the Fundamental-frequency Current component of the three-phase actual measurement of the t sampling instant of n transforming plant protecting installation place
(5) judge t sampling instantWhether set up, if so, then judge A phase extra-high-voltage alternating current
Transmission line of electricity breaks down, the breaker at tripping A phase ultrahigh voltage alternating current transmission lines two ends；
(6) judge t sampling instantWhether set up, if so, then judge that B phase extra-high-voltage alternating current is defeated
Electric line breaks down, the breaker at tripping B phase ultrahigh voltage alternating current transmission lines two ends；
(7) judge t sampling instantWhether set up, if so, then judge C phase extra-high-voltage alternating current
Transmission line of electricity breaks down, the breaker at tripping C phase ultrahigh voltage alternating current transmission lines two ends.
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| CN104360232A (en) * | 2014-11-14 | 2015-02-18 | 国家电网公司 | Line phase fault discrimination method based on phase characteristics of fault position factor |
| CN104795801B (en) * | 2015-04-29 | 2018-02-16 | 南京南瑞继保电气有限公司 | A kind of breaker non-three phase method of discrimination and device based on voltage |
| CN105071355B (en) * | 2015-05-19 | 2018-01-09 | 国家电网公司 | A kind of differential protecting method of long range extra high voltage direct current transmission line |
| CN108872768B (en) * | 2018-06-11 | 2020-09-22 | 国网湖北省电力有限公司宜昌供电公司 | Accurate test method for negative sequence element in double-voltage lockout |
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| CN102694374A (en) * | 2012-06-11 | 2012-09-26 | 福建省电力有限公司检修分公司 | Power transmission line differential protection method based on current traveling wave prediction |
| CN103248025A (en) * | 2013-05-10 | 2013-08-14 | 国家电网公司 | Lossy electric transmission line current traveling-wave differential protection method |
| CN103296649A (en) * | 2013-05-19 | 2013-09-11 | 国家电网公司 | Current-transformer-saturation-influence-resistant traveling-wave differential protection method for currents of lossy line |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694374A (en) * | 2012-06-11 | 2012-09-26 | 福建省电力有限公司检修分公司 | Power transmission line differential protection method based on current traveling wave prediction |
| CN103248025A (en) * | 2013-05-10 | 2013-08-14 | 国家电网公司 | Lossy electric transmission line current traveling-wave differential protection method |
| CN103296649A (en) * | 2013-05-19 | 2013-09-11 | 国家电网公司 | Current-transformer-saturation-influence-resistant traveling-wave differential protection method for currents of lossy line |
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Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee after: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Patentee after: STATE GRID CORPORATION OF CHINA Co-patentee after: STATE GRID FUJIAN MAINTENANCE Co. Co-patentee after: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Patentee before: State Grid Corporation of China Co-patentee before: STATE GRID FUJIAN MAINTENANCE Co. Co-patentee before: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co. |
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| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 351100 Putian province Fujian city Chengxiang District Nanyuan Xia Lin Street Road No. 999 Co-patentee after: STATE GRID CORPORATION OF CHINA Patentee after: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co. Co-patentee after: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Co-patentee after: STATE GRID FUJIAN MAINTENANCE Co. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Patentee before: STATE GRID CORPORATION OF CHINA Co-patentee before: STATE GRID FUJIAN MAINTENANCE Co. Co-patentee before: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co. |