CN106329494A - Oscillation center tracking and protection locking system and control method therefor - Google Patents
Oscillation center tracking and protection locking system and control method therefor Download PDFInfo
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- CN106329494A CN106329494A CN201610626113.1A CN201610626113A CN106329494A CN 106329494 A CN106329494 A CN 106329494A CN 201610626113 A CN201610626113 A CN 201610626113A CN 106329494 A CN106329494 A CN 106329494A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses an oscillation center tracking and protection locking system and a control method therefor. The oscillation center tracking and protection locking system comprises an information collection and processing module, a protection oscillation locking module and a protection reopening module which are arranged in sequence, wherein the information collection and processing module is used for obtaining information of current, voltage and measurement impedance in a protection installation position, and sending the obtained information to the protection oscillation locking module; the protection oscillation locking module is used for tracking and calculating a position function of the oscillation center, locking protection when it is determined that the system is in oscillation, or otherwise, continuously opening the protection; and the protection reopening module is used for opening protection when it is determined that the system is in failure, or otherwise, continuously locking the protection.
Description
Technical field
The present invention relates to the technical field of relay protection of power system, particularly relate to oscillation center and follow the trail of and protection blocking
System and control method thereof.
Background technology
Oscillation center be accurately positioned and follow the trail of be power system oscillation research importance, it is possible to for protection vibration close
The formulation of the structure and power system islanding control strategy locked and open scheme again provides important reference frame.
Traditional vibration identifying schemes based on local electrical quantities is fettered by local information, does not takes into account circuit offside
Electric parameters feature, oscillation center location with tracking in terms of there is many defects: identical criterion based on reactive voltage can
Determine the moment that oscillation center occurs, but the position of oscillation center cannot be positioned；Identical criterion based on compensation principle
There is certain adaptivity, but such criterion cannot be accurately positioned oscillation center when circuit both sides voltage magnitude does not waits；Base
The angle by protection installation place voltage and measurement electric current in IMPEDANCE ANGLE SEPARATION judges whether system is in oscillatory regime, such
Criterion is not affected by vibration mechanical periodicity, but easily judges by accident when circuit direction of tide is contrary.Such scheme also can be answered
For protecting out-of-step blocking, but mostly there is difficulty of adjusting, it is difficult to the impact of adaptive system changes of operating modes.And existing base
Less in vibration identification and the protection vibration scheme of Wide-area Measurement Information.
In recent years, along with developing rapidly of high speed wide area network technology and wide area measurement technology, WAMS (Wide Area
Measurement System) system can realize the synchronization of electrical phasor in the whole network and obtain, the refreshing frequency of measurement with communicate
Time delay can meet protection out-of-step blocking and the demand of oscillation center tracking.
Can overcome or at least subtract it is desirable to there is a kind of oscillation center to follow the trail of with protection blocking system and control method thereof
The drawbacks described above of light prior art.
Summary of the invention
It is an object of the invention to provide a kind of oscillation center tracking to overcome with protection blocking system and control method thereof
The above-mentioned problems in the prior art.
For achieving the above object, the present invention provides a kind of oscillation center to follow the trail of and protection blocking system, described oscillation center
Tracking and protection blocking system include that information gathering and the processing module being linked in sequence, protection out-of-step blocking module are opened with protection again
Amplification module；
Described information gathering and processing module are used for obtaining protection installation place electric current, voltage and the information of measurement impedance, and
Send it to protect out-of-step blocking module；
Described protection out-of-step blocking module is for the position function of tracing computation oscillation center, it determines when system occurs vibration
By protection blocking, otherwise protect continuous openness；
Described protection opens module when judgement system breaks down again by protection blocking, and otherwise protection continues locking.
The present invention also provides for a kind of oscillation center and follows the trail of the control method with protection blocking system, comprises the following steps:
(1) utilize this side voltage of circuit, electric current phasor and the voltage magnitude of offside, obtain oscillation center position function α and
Electrical distance coefficient；
(2) real-time tracing Power System Oscillation Center, according to the feature of oscillation center electrical distance coefficient, structure distance is protected
Protect out-of-step blocking criterion, protection opens criterion and assistant criteria thereof again.
Preferably, the described oscillation center position function α in described step (1) is defined as the oscillation center distance to M point
Account for the ratio of total track length, can be expressed as:
In formula,WithRespectively measure voltageWith voltage of oscillation centerBetween phase angle difference, keFor circuit both sides
Measure the ratio of voltage magnitude, i.e.
Preferably, the electrical distance coefficient described in described step (1) is defined as the electricity protecting installation place to oscillation center
Pressing and the ratio of equivalent machine built-in potential point to the voltage of oscillation center, the electrical distance coefficient of circuit both sides can be expressed as:
In formula, circuit both sides system impedance is respectively ZmAnd Zn, protected circuit impedance is ZL。UmWith ImIt is respectively M side
Measure electric current and measure voltage.
Preferably, described in described step (2), out-of-step blocking criterion is:
In formula, δ is system equivalent potential angle, δsetBeing taken as 90 °, in engineering, the power system oscillation cycle is generally 0.2s
～1.5s, taking the shortest cycle of oscillation is 0.2s, now system merit angular rate of change is | Δ δ/Δ t |=10 π rad/s, therefore δ 'set
Can be taken as 10 π rad/s, safety factor is Krel=1.2.
Preferably, protect described in described step (2) and open criterion again and be:
|Δk1/Δt|≥k′set
In formula, Δ t is sampling time interval, it is contemplated that certain nargin and reliability, k 'setIt is taken as the front k that suddenlys change1Change
10 times of rate, i.e. k 'set=50 | Δ k1(t-1)/Δt|。
Preferably, the more open assistant criteria is protected to be described in described step (2):
k1(n)-k1(n-k)≥0.02
In formula, k1N () is k sudden change being detected1Value, k1(n-k) for the value of k sampled point before sudden change, fast in order to meet
Speed and reliability, can be according to the number value of sampled point in half cycle.Sample frequency because using herein is 2kHz, takes
K=20.
The present invention proposes a kind of oscillation center and follows the trail of and protection blocking system and control method thereof, by the swinging of the present invention
The heart is followed the trail of and can accurately be calculated circuit two side system merit angle with protection blocking system and control method thereof, quick when merit angle is less
Open and protection, is effectively reduced the distance protection time by blindly locking；Can real-time tracing oscillation center position, and shake in system
Swing again quick open and protection during fault, improve Perfomance of protective relaying；Do not waited by system both sides equivalent electromotive force amplitude and protect
The impact of backpiece side impedance variation, it is possible to adapt to different oscillation modes.
Accompanying drawing explanation
Fig. 1 is that a kind of oscillation center is followed the trail of and protection blocking system construction drawing.
Fig. 2 is the equivalent analysis model of power system oscillation.
When Fig. 3 is system oscillation, M side is measured voltage and is moved trajectory diagram.
Fig. 4 is voltage x current phasor in system.
Fig. 5 is system phasor diagram when arc light resistance or metallic earthing generation three-phase shortcircuit.
Fig. 6 is the phasor analysis figure that merit angle does not arranges when oscillation center falls outside circuit.
Fig. 7 is that oscillation center track is followedChange curve.
Fig. 8 is system oscillation identification process figure.
Fig. 9 is distance protection out-of-step blocking opening strategy flow chart again.
Detailed description of the invention
Clearer for the purpose making the present invention implement, technical scheme and advantage, below in conjunction with in the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, the most identical or class
As label represent same or similar element or there is the element of same or like function.Described embodiment is the present invention
A part of embodiment rather than whole embodiments.The embodiment described below with reference to accompanying drawing is exemplary, it is intended to use
In explaining the present invention, and it is not considered as limiting the invention.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under not making creative work premise, broadly falls into the scope of protection of the invention.Under
Face combines accompanying drawing and is described in detail embodiments of the invention.
In the present invention one broad embodiment: the tracking of described oscillation center and protection blocking system include the letter being linked in sequence
Breath gathers and processing module, and protection out-of-step blocking module opens module again with protection；Described information gathering is used for processing module
Obtain protection installation place electric current, voltage and the information of measurement impedance, and send it to protect out-of-step blocking module；Described protection
Out-of-step blocking module is for the position function of tracing computation oscillation center, it determines by protection blocking when system occurs to vibrate, otherwise
Protection continuous openness；Described protection opens module when judgement system breaks down again by protection blocking, and otherwise protection continues
Locking.
In another broad embodiment of the present invention: oscillation center is followed the trail of and the control method of protection blocking system, including with
Lower step:
(1) utilize this side voltage of circuit, electric current phasor and the voltage magnitude of offside, obtain oscillation center position function α and
Electrical distance coefficient；
(2) real-time tracing Power System Oscillation Center, according to the feature of oscillation center electrical distance coefficient, structure distance is protected
Protect out-of-step blocking criterion, protection opens criterion and assistant criteria thereof again.
As it is shown in figure 1, the tracking of described oscillation center and protection blocking system include information gathering and the process being linked in sequence
Module 1, protection out-of-step blocking module 2 opens module 3 again with protection.
Described information gathering and processing module 1 are used for obtaining protection installation place electric current, voltage and the information of measurement impedance, and
Send it to protect out-of-step blocking module；
Described protection out-of-step blocking module 2 is for the position function of tracing computation oscillation center, it determines system is vibrated
Time by protection blocking, otherwise protect continuous openness；
Described protection opens module 3 when judgement system breaks down again by protection blocking, and otherwise protection continues locking.
As in figure 2 it is shown,WithRepresent circuit two side system equivalent potential respectively, and both amplitudes are equal in magnitude.Circuit
Both sides system impedance is respectively ZmAnd Zn.Protected circuit impedance is ZL, system whole impedance is defined as Z∑=ZM+ZL+ZN.If system
The superior and the subordinate's element impedance angle is equal, is protected circuit impedance angle Electric current is measured for protection installation place, circuit M side.
As it is shown on figure 3,WithRepresent M side and the measurement voltage of N side respectively,Represent that M side is measured between voltage and electric current
Angle.When element impedance angle each in system is essentially identical, the end points of the voltage phasor of each point all falls within phasor in figure
On.Cross O point rightDo vertical line,WithBetween angle beC point is line voltage distribution minimum point, therefore
PhasorBeing voltage of oscillation center, oscillation center is positioned atPlace, its voltage isIf M side protection dorsal part impedance ZMIt it is system
Whole impedance Z∑1/4, then M side measure voltage phasorEnd points will fallPhasor, at the 1/4 of M side, accordingly may be used
Depict phasor in figure 3Motion track.When both sides electromotive force angle changes between 0 °～360 °,End points will
Moving on circular arc, the most no matter between the electromotive force of system both sides, how angle changes,End points all fall withinPhasor is near M
At the 1/4 of side, can the relation between the length of launch plan middle conductor SM, MN, NC be thus SM:MN:NR=ZM:ZL:ZN。
As shown in Figure 4, when system both sides equivalent electromotive force amplitude differs in size, in system, voltage x current phasor is in system
In the case of middle element impedance angle is essentially identical, in system, the end points of each voltage phasor fallsIn phasor, andEnd
Point fallsPhasor is at the 1/4 of M side.Unlike Fig. 3, voltage of oscillation center phasorWill be to electromotive force amplitude
Less side skew, is no longer at the midpoint of system whole impedance.In Fig. 4WithRespectively measure voltageWith shake
Swing center voltageBetween phase angle difference, δ1And δ2It is respectively equivalent potentialWith voltage of oscillation centerBetween phase angle difference.Circuit
Phase angle difference between the voltage of both sidesSystem equivalent potential angle δ=δ1+δ2.Below by analysis and solutionδ and vibration
The position at center.
There is following trigonometric function relation in Fig. 4:
In formula, keFor the ratio of circuit two-sided measurement voltage magnitude, i.e.k1、k2It is respectively M side and the protection of N side is installed
Locate the ratio of the amplitude dropped to voltage of oscillation center to the voltage drop of oscillation center with equivalent machine built-in potential point, i.e.
Four equations in simultaneous formula (1), measure between voltage x current in the case of known to angle in M side, can obtain N side and measure electricity
PressureWith voltage of oscillation centerBetween phase angle difference be:
The ratio that definition oscillation center accounts for total track length to the distance of M point is oscillation center position function α, by Fig. 3 and formula
(1) in, first equation understands:
Definition protection installation place to the voltage of oscillation center and the ratio of equivalent machine built-in potential point to the voltage of oscillation center is
Electrical distance coefficient, the electrical distance coefficient of circuit both sides is respectively as follows:
By formula (4) and formula (5) it can be seen that this coefficient be substantially oscillation center to bus electrical distance with in vibration
The heart is to the ratio of the electrical distance of system equivalent machine built-in potential point.Formula (2), formula (4) and formula (5) are substituted into the 3rd in formula (1)
Can obtain with the 4th equation:
In the case of the angle measured between voltage and measurement electric current of protection installation place, M side is measurable, formula (6) and formula
(7) the most known (k of variable ineCan be calculated by the amplitude of circuit two-sided measurement voltage), therefore, circuit both sides in Fig. 3
Phase angle difference between voltage is:
Meanwhile, system equivalent potential angle is:
In formula:
System phasor diagram when arc light resistance or metallic earthing generation three-phase shortcircuit is as it is shown in figure 5, trouble point is positioned at
The F point of circuit MN.Now, fault paths is had:
In formula:Pressure drop for arc light resistance；ZfLine impedance for protection installation place, M side to guilty culprit position.
When occurring through the three-phase shortcircuit of arc resistance ground connection, the pressure drop maximum on arc resistance is less thanCan
Ignore the increasing-aid current impact on ground, therefore in figureAnd current in the fault pointApproximation same phase.Calculate according to Fig. 5
With the electrical distance coefficient that formula (4) and (5) have same form:
In formula, β is that trouble point accounts for the ratio of total track length to protection installation place, M side, and this ratio depends on that trouble point is online
The position of road MN.
As a example by circuit M side, contrast (11) and formula (4) are it can be seen that occur three-phase through electric arc during system oscillation
When resistance or metallic earthing fault, the electric proportionality coefficient of oscillation center will be undergone mutation.If system is only vibrated, in vibration
The heart is positioned at circuit midpoint, nowIf there is three-phase fault at the total track length of 0.2 times, M side in Zhen Dang,
Then k1To sportAnd keep constant until failure removal.In the case of symmetric fault can being constructed according to this characteristic,
Out-of-step blocking opening strategy.
Merit angle, system both sides can be accurately calculated, it is contemplated that both sides merit during system oscillation by formula (6), formula (7) and formula (9)
Angle presents slowly varying behavior, and during fault, will undergo mutation in merit angle, and structure vibration identical criterion is as follows:
In meter and the power system steady-state stability limit and vibration again fault time system merit angle between cooperation, and consider certain abundant
Degree, can be by δ in formula (13)setIt is taken as 90 °.In engineering, the power system oscillation cycle is generally 0.2s～1.5s, takes the shortest vibration week
Phase is 0.2s, and now system merit angular rate of change is | Δ δ/Δ t |=10 π rad/s, therefore δ 'setCan be taken as 10 π rad/s, reliably
Coefficient is Krel=1.2.
When the system merit angle calculated is more than threshold value, this route protection of locking, to avoid adjacent lines in vibration to send out
Raw short circuit causes this false protection.When the system merit angle calculated is less than threshold value, open this circuit and adjacent lines immediately
Distance protection, be effectively reduced when system oscillation initial stage merit angle is not yet arranged distance protection by the time of unreasonable locking, and
The performance that when can break down during effectively promoting out-of-step blocking, protection is open again.
Have the following characteristics that according to formula (6) and formula (7) calculated system both sides equivalent electromotive force phase angle difference
When 1, asking for this angle, not only need to obtain angle and circuit both sides between the measurement voltage x current protecting installation place
Measure the ratio of voltage magnitude, in addition it is also necessary to the protection dorsal part impedance of known both sides.In view of protection dorsal part impedance by system operation mode
Impact, it is difficult to measure when properly functioning, therefore when system jam, M side can be obtained according to principle of stacking and measure voltage x current
Relation is there is between Sudden Changing Rate:And then ask for M side protection dorsal part impedance be:
In formula,WithIt is respectively the positive-sequence component measuring voltage x current Sudden Changing Rate, uses same method can obtain N side
Protection dorsal part impedance.
2, as shown in Figure 3, circuit both sides voltageRespectively withAngle theta between phasor1And θ2It is acute angle.
By analysis abovePhasor withPhasor is equal, therefore can obtain formula (6) and condition that formula (7) is set up is:
As shown in Figure 6, when system merit angle is not arranged, if both sides voltage magnitude, oscillation center may fall at circuit
Outside MN.
In this case, formula (6) and formula (7) will have bigger error, and calculated system merit angle may be bigger.In order to
Avoid erroneous judgement, using formula (15) and (16) as the assistant criteria of out-of-step blocking.When formula (15) and (16) are set up simultaneously, pass through formula
(6) and formula (7) can accurate merit angle, response system both sides, do not affected by system both sides voltage magnitude is unequal.When formula (15)
(16) set up time different, and when the merit angle that calculates is bigger, it is believed that system merit angle is not yet arranged, now can be with open and protection.
If it should be noted that circuit both sides protection excessive being likely to of dorsal part impedance causes oscillation center to be positioned at outside circuit MN, or
Being positioned at protection dorsal part or be positioned on adjacent lines, now quickly open and protection can't cause the misoperation of distance protection.
The unequal impact for oscillation center position of analysis circuit both sides voltage magnitude below.Oscillation center position function
α withThe curve of change compares k as it is shown in fig. 7, give circuit both sides voltage magnitude in figureeFrom top to bottom in the range of 0.8-1.2
During change, the variation track of oscillation center.At keWhen=1.2, system merit angle is less, and now oscillation center is positioned on circuit MN and leans on
The side of nearly M, has also confirmed the previously mentioned oscillation center situation by the side skew less to line voltage distribution amplitude.Then
Along with system merit angle swing is opened, oscillation center is gradually to the side skew that voltage magnitude is bigger.keThe change of oscillation center position during ＜ 1
Change trend the most in contrast, keWhen=1, oscillation center is positioned at circuit midpoint.
As shown in Figure 8, measure voltage and current by protection installation place, circuit both sides and calculate the angle between themAnd
Base angle θ1、θ2, and circuit both sides voltage magnitude is substituted into formula (9) calculating system merit angle δ than ke, if formula (13), formula (15) and formula
(16) set up, then judgement system there occurs vibration simultaneously, by protection blocking, and the position function of tracing computation oscillation center, no
Then protect continuous openness.
Traditional distance protection out-of-step blocking scheme: open and protection in short-term after zero sequence, negative phase-sequence starting element action
160ms, the most always by distance protection I section and II section locking, reopens when breaking down in vibration again, but reopen
Strategy is the most loaded down with trivial details, and particularly with there is the situation of metallic ground fault in vibration again, open criterion also needs 150ms the most active
Make, significantly reduce the performance of distance protection.After using the vibration identification shown in Fig. 7 and lock-out scheme, circuit
If distance protection I section and II section action, whether first detection out-of-step blocking flag bit is 0, if 0 direct open and protection.
If 1 calculates the electric proportionality coefficient in route protection installation place, by analysis above, now system merit according to formula (4)
Angular difference is relatively big, and the value of electric proportionality coefficient is basically unchanged；If breaking down, its value can be undergone mutation, and the open criterion of structure is as follows:
|Δk1/Δt|≥k′set (17)
In formula, Δ t is sampling time interval, it is contemplated that certain nargin and reliability, k 'setIt is taken as the front k that suddenlys change1Change
10 times of rate, i.e. k 'set=50 | Δ k1(t-1)/Δt|。
Meanwhile, after being apparent from sudden change electrically proportionality coefficient with only vibrate fault-free time electric proportionality coefficient because of abort situation general
Different from oscillation center position, there is certain difference, thus can construct assistant criteria as follows:
k1(n)-k1(n-k)≥0.02 (18)
In formula, k1N () is k sudden change being detected1Value, k1(n-k) for the value of k sampled point before sudden change, fast in order to meet
Speed and reliability, can be according to the number value of sampled point in half cycle.Sample frequency because using herein is 2kHz, takes
K=20.By cooperating of formula (17) and formula (18), it is possible to fast and reliable open and protection under failure condition again in vibration.
As it is shown in figure 9, during out-of-step blocking, if the k1 calculated meets formula (17), meet formula (18) subsequently, then judge
For fault, otherwise protection continues locking.
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit.To the greatest extent
The present invention has been described in detail by pipe with reference to previous embodiment, it will be understood by those within the art that: it is still
Technical scheme described in foregoing embodiments can be modified, or wherein portion of techniques feature is carried out equivalent replace
Change；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the essence of various embodiments of the present invention technical scheme
God and scope.
Claims (7)
1. an oscillation center is followed the trail of and protection blocking system, it is characterised in that include information gathering and the process being linked in sequence
Module, protection out-of-step blocking module opens module again with protection；
Described information gathering and processing module are used for obtaining protection installation place electric current, voltage and the information of measurement impedance, and by it
Send to protection out-of-step blocking module；
Described protection out-of-step blocking module is for the position function of tracing computation oscillation center, it determines system occurs will protect during vibration
Protect locking, otherwise protect continuous openness；
It is when judgement system breaks down, protection is open that described protection opens module again, and otherwise protection continues locking.
2. follow the trail of and the control method of protection blocking system for the oscillation center described in the claims 1, including with
Lower step:
(1) utilize this side voltage of circuit, electric current phasor and the voltage magnitude of offside, obtain oscillation center position function α with electric
Distance coefficient；
(2) real-time tracing Power System Oscillation Center, according to the feature of oscillation center electrical distance coefficient, structure distance protection is shaken
Swing locking criterion, protection opens criterion and assistant criteria thereof again.
3. oscillation center as claimed in claim 2 follows the trail of the control method with protection blocking system, it is characterised in that: described step
Suddenly the oscillation center position function α in (1) is defined as oscillation center and accounts for the ratio of total track length to the distance of M point, can represent
For:
In formula,WithRespectively measure voltageWith voltage of oscillation centerBetween phase angle difference, keFor circuit two-sided measurement
The ratio of voltage magnitude, i.e.
4. oscillation center as claimed in claim 2 follows the trail of the control method with protection blocking system, it is characterised in that: described step
Suddenly the electrical distance coefficient described in (1) is defined as the protection installation place voltage to oscillation center with equivalent machine built-in potential point to shaking
Swinging the ratio of the voltage at center, the electrical distance coefficient of circuit both sides can be expressed as:
In formula, circuit both sides system impedance is respectively ZmAnd Zn, protected circuit impedance is ZL, UmWith ImIt is respectively the measurement of M side
Electric current and measurement voltage.
5. oscillation center as claimed in claim 2 follows the trail of the control method with protection blocking system, it is characterised in that: described step
Suddenly described in (2), out-of-step blocking criterion is:
In formula, δ is system equivalent potential angle, δsetBe taken as 90 °, in engineering the power system oscillation cycle be generally 0.2s～
1.5s, taking the shortest cycle of oscillation is 0.2s, now system merit angular rate of change is | Δ δ/Δ t |=10 π rad/s, therefore δ 'setCan
Being taken as 10 π rad/s, safety factor is Krel=1.2.
6. oscillation center as claimed in claim 2 follows the trail of the control method with protection blocking system, it is characterised in that: described step
Suddenly protect described in (2) and open criterion again and be:
|Δk1/Δt|≥k′set
In formula, Δ t is sampling time interval, it is contemplated that certain nargin and reliability, k 'setIt is taken as the front k that suddenlys change1The 10 of rate of change
Times, i.e. k 'set=50 | Δ k1(t-1)/Δt|。
7. oscillation center as claimed in claim 2 follows the trail of the control method with protection blocking system, it is characterised in that: described step
Suddenly the more open assistant criteria is protected to be described in (2):
k1(n)-k1(n-k)≥0.02
In formula, k1N () is k sudden change being detected1Value, k1(n-k) for the value of k sampled point before sudden change, in order to meet rapidity
And reliability, because the sample frequency used herein is 2kHz, k=can be taken according to the number value of sampled point in half cycle
20。
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107134776A (en) * | 2017-06-27 | 2017-09-05 | 华北电力大学 | The centralized positioning of multi frequency system asynchronous oscillation and displacement path tracing system and method |
| CN107332215A (en) * | 2017-07-18 | 2017-11-07 | 华北电力大学 | Distance protection out-of-step blocking and open system and its method again under multi-frequency oscillation scene |
| CN111030086A (en) * | 2019-11-21 | 2020-04-17 | 中国电力科学研究院有限公司 | Power grid out-of-step oscillation center positioning method and system based on voltage phasor trajectory |
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| CN107134776A (en) * | 2017-06-27 | 2017-09-05 | 华北电力大学 | The centralized positioning of multi frequency system asynchronous oscillation and displacement path tracing system and method |
| CN107134776B (en) * | 2017-06-27 | 2020-11-03 | 华北电力大学 | System and method for positioning out-of-step oscillation center and tracking displacement path of multi-frequency system |
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| CN111030086A (en) * | 2019-11-21 | 2020-04-17 | 中国电力科学研究院有限公司 | Power grid out-of-step oscillation center positioning method and system based on voltage phasor trajectory |
| CN111030086B (en) * | 2019-11-21 | 2022-07-01 | 中国电力科学研究院有限公司 | Power grid out-of-step oscillation center positioning method and system based on voltage phasor trajectory |
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