CN102946090B - Power transmission line protection realizing method based on multi-dimensional information - Google Patents
Power transmission line protection realizing method based on multi-dimensional information Download PDFInfo
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Abstract
The invention provides a power transmission line protection realizing method based on multi-dimensional information. The method comprises the steps of (1) acquiring interval information, substation area information and zone information that cover electrical equipment, (2) extracting time dimensional information and characteristic dimensional information from spatial dimensional information, and (3) constructing a main protection criterion, a substation area backup protection criterion, an overload protection criterion and a line protection and stability control coordination strategy of a power transmission line with the multi-dimensional information. The method comprehensively utilizes fault information of spatial dimension, time dimension and characteristic dimension to achieve a power transmission line protection criterion, so that the adaptability and movement performance of a protective device are improved.
Description
Technical field
The invention belongs to field of relay protection in power, be specifically related to a kind of line protection implementation method based on various dimensions information.
Background technology
Traditional circuit protection is protection wall scroll transmission line, the electric parameters that Protection criteria adopts is only limitted to transmission line both sides or one-sided electric parameters, do not utilize the information of other elements of transformer station, when protective device fault, need the backup protection excision faulty equipment utilizing adjacent elements, because backup protection performance is by system operation mode, transition resistance, the impact of the factors such as fault moment, difficulty is coordinated between backup protection, there is the risk of mismatch, transformer station is utilized entirely to stand the backup protection of information realization transmission line, the redundant information of transformer station can be made full use of, quick identification abort situation, excision fault element, simplify the adaptive setting of line backup protection, improve Reliability of Microprocessor.
Current route protection is to protect transmission line for main target; cooperation is lacked between protection and stability contorting; when circuit overload; send out alarm signal, when in circuit heavy load situation, when measurement impedance falls into distance protection III section active region; distance protection action; load large area can be caused time serious to shift, and then produce cascading trip, electric grid large area power cut.By delivering to stabilization control device by the overload information of transmission line; stability control device is utilized to carry out prevention and control; take machine of cutting, cutting load measure; eliminate circuit overload phenomenon; prevent the cascade tripping that overload causes protection act to cause, stability and the power supply reliability of system can be improved.
Fault message after equipment fault covers each time period; current route protection only adopts the magnitude of current, voltage power frequency component (or the two combination) establishing protective criterion; waste fault message useful in a large number, and performance is by the impact of fault transient process.By carrying out deep data mining to failure process and fault signature, extracting the feature representing fault, new route protection criterion can be constructed.
The relaying protection of comprehensive utilization various dimensions (time, space, feature) information effectively can utilize fault message, improves adaptability and the flexibility of route protection, reaches fast, accurately excises the object of fault.
Summary of the invention
In order to effectively utilize fault message; promote relaying protection performance; the invention provides a kind of line protection implementation method based on various dimensions information; the fault message of integral utilization space dimension, time dimension and characteristic dimension; structure circuit Protection criteria, improves adaptability and the performance of route protection.
In order to understand thought of the present invention better, the existing technical name to occurring in the present invention illustrates or is defined as follows:
Spatial Dimension and Spatial Dimension information:
Spatial Dimension is from protection range angle, ascending, comprises interval (single electric component), territory of standing (whole transformer station) and region (one or more transformer station) respectively.
Spatial Dimension information comprises interval information, stand domain information and area information, and domain information of wherein standing comprises multiple interval information, and area information comprises one or more stations domain information, comprises multiple interval information simultaneously.
Interval information: interval refers to single electric component, interval information is the information obtained from single electric component collection, for circuit, interval information comprise flow through circuit both sides electric current, line side PT gather voltage, line temperature.
To stand domain information: the information gathered from all electric components of transformer station (comprising circuit, transformer, bus and reactor etc.).
Domain information of standing comprises electric current, voltage, temperature, wherein, current acquisition has circuit both sides, each side of transformer, reactor both sides from substation, voltage acquisition is from all buses of transformer station, and temperature acquisition has circuit, transformer, bus and reactor from substation.
Area information: region comprises one or more transformer station, area information collection has circuit, transformer, bus and reactor from substation that this region comprises.
Area information comprises electric current, voltage, temperature, and current acquisition is each circuit both sides in region, and voltage acquisition is each bus in region, and temperature acquisition is circuit, transformer and bus in region.
Time dimension and time dimensional information:
Time dimension is from time angle; electric parameters after relaying protection employing fault within the scope of different time, time dimension information comprises steady-state current, component of voltage after transient current, component of voltage, steady-state current, component of voltage and failure removal after fault.
Characteristic dimension and characteristic dimension information:
Characteristic dimension refers to fault signature, and it can be utilized to realize protection philosophy.The information of characteristic dimension comprises electric current, voltage, direction, impedance, energy, frequency spectrum, row ripple, transient state component.
Transient current in time dimension information after fault, component of voltage, steady-state current, component of voltage extract from interval information.
Electric current in characteristic dimension information, voltage, direction, impedance, energy, frequency spectrum, row ripple, transient state component extract from interval information.
The present invention is concrete by the following technical solutions.
Based on a line protection implementation method for various dimensions information, it is characterized in that, said method comprising the steps of:
(1) the Spatial Dimension information relevant to transmission line is gathered, described Spatial Dimension information comprises the interval information of protected circuit, domain information of standing, area information, domain information of wherein standing comprises multiple interval information, and area information comprises one or more stations domain information;
(2) from each Spatial Dimension information described in step (1), extract the time dimension information of protected transmission line, comprise electric current in interval information, the steady-state component of voltage and transient state component, the steady-state component of electric current, voltage in domain information of standing, area information;
(3) from each Spatial Dimension information described in step (1), extract the characteristic dimension information relevant to protected circuit, comprise electric current, voltage, direction, impedance, row ripple, frequency spectrum, energy, transient state spectrum energy, temperature etc.;
(4) utilize step (2) from transmission line interval information extraction time dimensional information and the main protection of characteristic dimension information structuring transmission line of extracting from interval information according to step (3);
(5) backup protection of transmission line described in the characteristic dimension information structuring utilizing step (3) to extract in interval information from transmission line interval information to extract transmission line characteristic dimension information and/or utilize the Substation Electric Equipment extracted in step (3) slave station domain information;
(6) the characteristic dimension information structuring transmission line overload protection, route protection and the stability contorting coordination control strategy that utilize step (3) to extract from area information.
Compared with the prior art; the invention provides a kind of route protection implementation method based on various dimensions information; the method can fully utilize time dimension, Spatial Dimension and characteristic dimension and realize Protection criteria, improves the adaptability of route protection criterion, the performance of lifting protection device.
Accompanying drawing explanation
Fig. 1 is based on the Protection Scheme for Transmission Line schematic diagram of multidimensional information.
Fig. 2 is the line protection method flow diagram that the present invention is based on various dimensions information.
Fig. 3 is the line segregation backup protection flow chart that the present invention is based on interval information.
Fig. 4 is the circuit station territory backup protection flow chart that the present invention is based on station domain information.
Fig. 5 protects and stability contorting cooperation control flow chart based on the circuit overload of area information.
Embodiment
The information of Spatial Dimension, time dimension and characteristic dimension is utilized, structure route protection shown in Fig. 1.Wherein Spatial Dimension information comprise interval, territory of standing, area information, time dimension information comprises transient state component and steady-state component, and characteristic dimension information comprises temperature, energy, electric current, voltage, frequency spectrum, impedance.Protective device can realize main protection, backup protection, overload protection and stabilization control device Cooperation Strategy.
Figure 2 shows that the line protection method flow diagram based on various dimensions information that the present invention proposes.Based on the line protection implementation method of various dimensions information, comprise the following steps:
Step 1, the Spatial Dimension information that collection is relevant to transmission line; described Spatial Dimension information comprises the interval information of protected circuit, domain information of standing, area information; wherein interval information is the measuring amount of transmission line both sides; domain information of standing is the measuring amount of transmission line place transformer station all electric equipments (transmission line, bus, transformer etc.) each side; domain information of standing comprises multiple interval information, and area information is the measuring amount of each side of some transformer stations (comprising this transformer station) electric equipment near the transformer station of transmission line place.
Step 2, from each Spatial Dimension information described in step 1, extract the time dimension information of protected transmission line; time dimension information comprises transient state component and the steady-state component of electric parameters; steady-state component and the transient state component of electric parameters can be extracted from interval information, the steady-state component of electric parameters in slave station domain information and area information, can be extracted.
Step 3, the characteristic dimension information that extraction is relevant to protected circuit from each Spatial Dimension information described in step 1; comprise directly measured quantities and derivation amount; wherein directly measured quantities comprises electric current, voltage, row ripple, temperature etc., and derivation amount comprises direction, impedance, frequency spectrum, energy, transient state spectrum energy, temperature etc.
Step 4, utilize step 2 from transmission line interval information extraction time dimensional information and the main protection of characteristic dimension information structuring transmission line of extracting from interval information according to step 3.
In optimal technical scheme provided by the invention, power line main protection comprises current differential protection, distance protection and current spectrum protection, is the logical relation of "or" between three Protection criteria, and three Protection criteria are as follows respectively:
Current differential protection criterion is
wherein,
for circuit both sides electric current, k is restraint coefficient;
Distance protection criterion is Z
measure<Z
set, wherein Z
measurefor protecting the measurement impedance of installation place,
or
z
setfor impedance of adjusting, when circuit both sides meet Z simultaneously
measure<Z
settime, distance protection action;
Current spectrum Protection criteria is
wherein x (n), y (n) are circuit both sides current spectrum value, ρ
setfor current spectrum protection seting value.
Step 5, utilize step 3 to extract in interval information from transmission line interval information to extract transmission line characteristic dimension information and/or utilize the Substation Electric Equipment extracted in step 3 slave station domain information characteristic dimension information structuring described in the backup protection of transmission line.
In optimal technical scheme provided by the invention, described line backup protection comprises two parts: utilize interval information to realize and utilize station domain information to realize.The line backup protection of interval information (being defined as line segregation backup protection) is utilized only to adopt the information of single circuit; backup protection function is realized to single circuit; utilize the line backup protection (being defined as the territory backup protection of circuit station) of station domain information to adopt the information of all elements of transformer station, the backup protection function that there is circuit substation can be realized.
Line segregation backup protection implementation method is as follows:
Transmission line characteristic dimension information is extracted from interval information; comprise electric current, voltage, impedance, energy; the backup protection of structure line segregation; comprise current protection criterion, voltage protection criterion, impedance protection criterion and protecting energy criterion; it is the logical relation of "or" between four Protection criteria; arbitraryly in four criterions meet operation condition, line segregation backup protection action, four Protection criteria are as follows respectively:
Utilize the Protection criteria of current flow configuration for I>I
set, wherein I is the electric current of protection installation place, I
setfor current protection setting value,
The Protection criteria utilizing voltage to construct is U<U
set, wherein U is the voltage of protection installation place, U
setfor voltage protection setting value.
Utilize the Protection criteria of impedance structure for Z<Z
set, wherein Z=U/I, for protecting the impedance of installation place, Z
setfor impedance protection setting value.
The Protection criteria utilizing energy to construct is E>E
set, wherein
i (n) is current sampling data, E
setfor protecting energy setting value.
Figure 3 shows that the line segregation backup protection flow chart that the present invention is based on interval information, line segregation standby, protection flow process is:
(1) main protection is failure to actuate;
(2) electric current criterion I>I is met
set(I is protection installation place electric current, I
setfor current setting) time, line segregation backup protection action, otherwise, go to (3);
(3) voltage criterion U<U is met
set(U is protection installation place voltage, U
setfor voltage setting value) time, line segregation backup protection action, otherwise, go to (4);
(4) impedance criterion Z<Z is met
set(Z is protection installation place impedance, Z
setfor impedance setting value) time, line segregation backup protection action, otherwise, go to (5);
(5) energy criterion E>E is met
set(E is the energy of protection installation place, E
setfor energy setting value) time, line segregation backup protection action, otherwise, go to (2).
Circuit station territory backup protection implementation method is as follows:
Extract transmission line characteristic dimension information in slave station domain information, comprise electric current, voltage, the territory backup protection of structural line way station.
If there be n electric component (comprising transformer, bus, reactor, circuit) in transformer station, gather electric current and the voltage of n each side of electric component, build station territory differential protection criterion
wherein
for flow out transformer station each branch road electric current and, m is the branch road number flowing out transformer station, I
set2for territory, station differential protection setting value.When meeting station territory differential protection criterion, calculate the direction component criterion of each element of transformer station, the criterion of direction component is
wherein
for positive sequence voltage,
for forward-order current, when n-th circuit both sides meets direction component criterion simultaneously, territory backup protection action of standing, tripping n-th circuit.
Attached Figure 4 shows that the present invention is based on station domain information circuit station territory backup protection flow chart, circuit station territory backup protection flow process is:
(1) electric current and the voltage of each side of electric component in transformer station is gathered.
(2) calculate
wherein
for flow out transformer station each branch road electric current and, m is the branch road number flowing out transformer station.
(3) if
i
set2for territory, station differential protection setting value, calculate the direction component criterion of each element of transformer station, the criterion of direction component is
wherein
for positive sequence voltage,
for forward-order current, otherwise go to (2);
(4) when n-th circuit both sides meets direction component criterion simultaneously, territory backup protection action of standing, tripping n-th circuit.
Step 6, the characteristic dimension information structuring transmission line overload protection, route protection and the stability contorting coordination control strategy that utilize step 3 to extract from area information.
In optimal technical scheme provided by the invention, in described step (6), overload protection implementation method is as follows:
Gather electric current and the temperature of each bar transmission line in protection zone; temperature also can adopt measured data by Current calculation, utilizes the formula of Current calculation temperature for (see " IEEE 738-1986.standard for calculation of bare overhead conductor temperature and ampacity under steady-state conditions. ")
In formula, T
cfor line temperature, t represents the time, and m is conductor quality, C
pfor the specific heat capacity of conductor, q
lrepresent the heat of conductor because being produced by electric current, q
sfor the heat that conductor absorbs due to Sunlight Action, q
cand q
rrepresent conductor heat loss through convection amount and heat loss through radiation amount respectively.。
As line current I>I
set1(I
set1for overload protection setting value), start overload criterion, overload criterion is T
c>T
set(T
setfor overload protection setting value), when the operation condition of overload criterion meets, circuit overload protection act.
Shown in Fig. 5 based on the overload protection of Wide-area Measurement Information and stability contorting cooperation control flow process be:
(1) pickup area line current, utilizes formula (1) computational scheme temperature;
(2) when line current meets I>I
set1time, start overload protection, this circuit distance protection of locking simultaneously III section;
(3) utilize formula (1) computational scheme can bear overload time t, overload information (overload circuit, overload line current, t) is sent to stabilization control device simultaneously;
(4) stabilization control device takes machine of cutting, cutting load measure, in (0 ~ t), if do not meet overload criterion T
c<T
setoperation condition, overload protection returns, and removes the locking of protection III section of adjusting the distance, otherwise, go to (5).
(5) in (0 ~ t), if meet overload criterion T
c>T
setoperation condition, circuit overload protection act.
It is to be understood that content of the present invention and embodiment are intended to the practical application proving technical scheme provided by the present invention, should not be construed as limiting the scope of the present invention.Those skilled in the art inspired by the spirit and principles of the present invention, can do various amendment, equivalent replacement or improve.But these changes or amendment are all in the protection range that application is awaited the reply.
Claims (9)
1., based on a line protection implementation method for various dimensions information, it is characterized in that, said method comprising the steps of:
(1) the Spatial Dimension information relevant to transmission line is gathered, described Spatial Dimension information comprises the interval information of protected circuit, stand domain information and area information, domain information of wherein standing comprises multiple interval information, and area information comprises one or more stations domain information;
(2) from the Spatial Dimension information described in step (1), extract the time dimension information of protected transmission line, comprise steady-state component and the transient state component of electric current and voltage in interval information, and the steady-state component of electric current and voltage in station domain information and area information;
(3) from the Spatial Dimension information described in step (1), extract the characteristic dimension information relevant to protected circuit, comprise electric current, voltage, direction, impedance, row ripple, frequency spectrum, energy, transient state spectrum energy and temperature;
(4) utilize step (2) from transmission line interval information extraction time dimensional information and the main protection of characteristic dimension information structuring transmission line of extracting from interval information according to step (3);
Wherein, described transmission line main protection comprises current differential protection, distance protection and current spectrum protection, is "or" logical relation between three Protection criteria;
(5) utilize step (3) from transmission line interval information, extract transmission line characteristic dimension information and/or utilize the backup protection of transmission line described in the characteristic dimension information structuring of the Substation Electric Equipment extracted in step (3) slave station domain information, wherein, transmission line backup protection comprises line segregation backup protection and the territory backup protection of circuit station;
(6) the characteristic dimension information structuring transmission line overload protection, route protection and the stability contorting coordination control strategy that utilize step (3) to extract from area information.
2. the line protection implementation method based on various dimensions information according to claim 1, is characterized in that:
Current differential protection criterion is
wherein,
for circuit both sides electric current, k is restraint coefficient.
3. the line protection implementation method based on various dimensions information according to claim 1, is characterized in that:
Distance protection criterion is Z
measure<Z
set, wherein Z
measurefor protecting the measurement impedance of installation place, Z
setfor distance protection setting impedance, when circuit both sides meet Z simultaneously
measure<Z
settime, distance protection action.
4. the line protection implementation method based on various dimensions information according to claim 1, is characterized in that:
Described current spectrum Protection criteria is
wherein x (n), y (n) are circuit both sides current spectrum value, and N is the sampling number of both sides electric current, ρ
setfor current spectrum criterion setting value, when meeting above-mentioned criterion, current spectrum protection act.
5. the line protection implementation method based on various dimensions information according to claim 1, is characterized in that:
Utilize from transmission line interval information, extract the interval backup protection of transmission line characteristic dimension information structure transmission line;
Described line segregation backup protection comprises current protection criterion, voltage protection criterion, impedance protection criterion and protecting energy criterion; be "or" logical relation between four Protection criteria; arbitraryly in four criterions meet operation condition; line segregation backup protection action, four Protection criteria are as follows respectively:
Utilize the Protection criteria of current flow configuration for I>I
set, wherein I is the line current that protection installation place is measured, I
setfor current protection setting value;
The Protection criteria utilizing voltage to construct is U<U
set, wherein U is the line voltage distribution of protection installation place, U
setfor voltage protection setting value;
Utilize the Protection criteria of impedance structure for Z<Z
set, wherein Z=U/I, for protecting the measurement impedance of installation place, Z
setfor impedance protection setting value;
The Protection criteria utilizing energy to construct is E>E
set, wherein E is the energy of protection installation place,
k is sampling number, and i (n) is current sampling data, E
setfor protecting energy setting value.
6. the line protection implementation method based on various dimensions information according to claim 1, is characterized in that:
Utilize the characteristic dimension information structuring power transmission line way station territory backup protection of extracting Substation Electric Equipment in step (3) slave station domain information, territory backup protection of standing comprises station territory differential protection criterion and transmission line directional element criterion, and the two is the logical relation of "AND";
Wherein, territory differential protection criterion of standing is:
for flow out transformer station each branch road electric current and, m is the branch road number flowing out transformer station, I
set2for territory, station differential protection setting value;
When territory, satisfied station differential protection criterion, the direction component criterion of computing electric power line, the criterion of direction component is
wherein
for certain transmission line one end positive sequence voltage,
for the forward-order current of this transmission line one end, when certain transmission line both sides meet direction component criterion simultaneously, territory backup protection action of standing, this transmission line of tripping.
7. the line protection implementation method based on various dimensions information according to claim 1, is characterized in that:
In described step (6), described overload protection, according to the overload protection of the characteristic dimension information structuring circuit that step (3) is extracted from area information;
As transmission line electric current I >I
set1time, wherein I
set1for overload protection setting value, start overload criterion, described overload criterion is T
c>T
set, wherein, T
cfor temperature of electric transmission line value, T
setfor overload protection setting value, when the operation condition of overload criterion meets, circuit overload protection act.
8. the line protection implementation method based on various dimensions information according to claim 7, is characterized in that:
In described step (6), overload protection, route protection coordinate as follows with stability contorting coordination control strategy:
Gather electric current and the temperature of each bar transmission line in protection zone, as line current I>I
set1time, start overload criterion, the distance protection of locking simultaneously III section, computational scheme can bear overload time t, overload information is sent to stabilization control device simultaneously, and stabilization control device takes machine of cutting, cutting load measure, in 0 ~ t, if T
c<T
set, overload protection returns, and removes the locking of protection III section of adjusting the distance, if T
c>T
set, circuit overload protection act.
9. the line protection implementation method based on various dimensions information according to claim 1, is characterized in that:
In described step (1), interval information and station domain information collection are transmitted by SV/GOOSE net, and area information is transmitted by PMU.
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| CN103425523A (en) * | 2013-06-20 | 2013-12-04 | 国家电网公司 | Parallel computing system and method of PMU (Phasor Measurement Unit) online application system |
| CN104578006B (en) * | 2014-12-19 | 2018-04-10 | 清华大学 | The accident overload blocking method for domain distance protection III sections of standing |
| CN108919049A (en) * | 2018-05-28 | 2018-11-30 | 国家电网公司华中分部 | A kind of Guangdong power system diagnostic method based on multidimensional information |
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| CN101409442A (en) * | 2008-11-25 | 2009-04-15 | 中国南方电网有限责任公司 | Rapid line backup protection method with reliable selection based on wide area measuring system |
| CN102738779A (en) * | 2012-06-26 | 2012-10-17 | 中国电力科学研究院 | Coordination control method of wide area protection and stabilization device |
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| US4719580A (en) * | 1984-06-15 | 1988-01-12 | Asea Aktiebolag | Detection and location of a fault point based on a travelling wave model of the high voltage transmission line |
| CN101409442A (en) * | 2008-11-25 | 2009-04-15 | 中国南方电网有限责任公司 | Rapid line backup protection method with reliable selection based on wide area measuring system |
| CN102738779A (en) * | 2012-06-26 | 2012-10-17 | 中国电力科学研究院 | Coordination control method of wide area protection and stabilization device |
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