CN110504662A - The longitudinal differential protection method of double-fed fan motor field submitting route - Google Patents
The longitudinal differential protection method of double-fed fan motor field submitting route Download PDFInfo
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- CN110504662A CN110504662A CN201910617341.6A CN201910617341A CN110504662A CN 110504662 A CN110504662 A CN 110504662A CN 201910617341 A CN201910617341 A CN 201910617341A CN 110504662 A CN110504662 A CN 110504662A
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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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Abstract
The invention discloses the longitudinal differential protection methods that route is sent out in a kind of double-fed fan motor field, and in particular to the relay protection field of power delivery circuit.The longitudinal differential protection method of route is sent out from the electric current of the data window length after the two sides acquisition failure for sending out route in the double-fed fan motor field; calculate separately the related coefficient of certain phase current: if certain phase current related coefficient is less than given threshold; then determine that sending out route has occurred troubles inside the sample space; this is mutually failure phase, protection act；Separate greater than threshold value is judged to non-faulting phase, and the protection of corresponding phase is failure to actuate；If certain phase current related coefficient is not less than given threshold, it is judged to external area error, protects involution.There is this method certain anti-transition impedance and anti-saturation ability, wind power plant inner blower to operate under different operating conditions and also can correctly act, and is based on transient current waveform, has had both than width and than phase function.
Description
Technical field
The present invention relates to the relay protection fields of power delivery circuit, and in particular to a kind of double-fed fan motor field sends out the vertical of route
Differential protecting method.
Background technique
China's wind power plant is mostly that extensive, centralization form is grid-connected, and boosting carries out Long Distant Transmit after wind-powered electricity generation collects, and is sent
The voltage class of route seldom considers the particularity of wind-powered electricity generation in 110kV or more, relaying configuration and adjusting out, with traditional power grid
It is identical.Output characteristics after double-fed fan motor unit wind power plant failure and the synchronous generator characteristic after the failure of traditional power grid are not
Together, failure fast and accurately effectively cannot be cut off according to the particularity of wind power plant.And largely answering with power electronic equipment
With and renewable energy scale access power grid, the development and relay protection of power grid face the protection of definite value formula and are rushed
Hit, based on the protection philosophy of power frequency quantity under power electronics environment characteristic be deteriorated etc. severe challenges.Therefore, believed based on fault correlation
The novel protected system of breath, the relay protection new principle based on fault transient measure feature, relay protection function are expanded, and become new
Developing direction.
Summary of the invention
Wind power plant and system side failure electric current when the purpose of the present invention is in view of the above deficiencies, proposing one kind based on failure
Send out the longitudinal differential protection method of route in the double-fed fan motor field that transient-wave difference is calculated.
The present invention specifically adopts the following technical scheme that
The longitudinal differential protection method of route is sent out in double-fed fan motor field, and this method is based on wind power plant and system side event when failure
Hinder current temporary state different wave shape, specifically includes the following steps:
The electric current long from a data window after the two sides acquisition failure for sending out route, calculates separately certain phase using formula (1)
The related coefficient of electric current:
Wherein, variable x={ x1,x2,...,xn, y={ y1,y2,...,yn, n is sampling number, and r (x, y) is after calculating
Related coefficient, the value range of r (x, y) is to indicate that the waveform of two variables x and y become between+1~-1 as r (x, y) > 0
Law is positively correlated, and related coefficient indicates two variable change rules closer to identical closer to 1；R (x, y) more connects
It is bordering on -1, then it represents that the two changing rule is completely on the contrary, negatively correlated；When r (x, y) absolute value is close to 0, then it represents that two waves
Deformation law differs greatly, correlation is weaker；
If certain phase current correlation coefficient r (x, y) is less than given threshold, determine that sending out route has occurred troubles inside the sample space, it should
It is mutually failure phase, protection act；Separate greater than threshold value is judged to non-faulting phase, and the protection of corresponding phase is failure to actuate；
If certain phase current correlation coefficient r (x, y) is not less than given threshold, it is judged to external area error, protects involution.
Preferably, described to set the threshold to 0.9, if related coefficient less than 0.9, indicates that this mutually breaks down.
Preferably, a length of 10ms of the data window.
The invention has the following beneficial effects:
The longitudinal differential protection method that route is sent out in the double-fed fan motor field has certain anti-transition impedance and anti-saturation energy
Power, wind field inner blower are operated under different operating conditions and also can correctly be acted, and are based on transient current waveform, have been had both than width and than phase function
Can, the influence to frequency shift (FS) also has certain resilience, and data window used is shorter, and accesses power grid in wind power plant T, makees
It can also correctly be acted under sending out this case that line provides short circuit current jointly for distribution power and another side system.
Detailed description of the invention
Fig. 1 is wind power plant main electrical scheme schematic diagram；
Fig. 2 a is to send out route troubles inside the sample space two sides transient current schematic diagram；
Fig. 2 b is to send out route external area error two sides transient current schematic diagram；
Fig. 3 a is that parameter is arranged in mutual inductor；
Fig. 3 b is current waveform figure when troubles inside the sample space mutual inductor is saturated.
Specific embodiment
A specific embodiment of the invention is described further in the following with reference to the drawings and specific embodiments:
The longitudinal differential protection method of route is sent out in double-fed fan motor field, and this method is based on wind power plant and system side event when failure
Hinder current temporary state different wave shape, correlation analysis is used to indicate the degree of correlation of two variables, calculates and becomes with Pearson correlation coefficient
Correlation is measured, the degree of correlation of two variables is measured using covariance and standard deviation, for mutually independent two variables,
Pearson correlation coefficient has the characteristics that not influenced by variation amplitude size, is capable of two transient current waveforms of valid metric
Correlation.
Two sides transient current waveform phase when sending out route generating region internal and external fault in conjunction with double-fed variable-speed wind-power unit wind power plant
The analysis of closing property, fetching and delivering out route current direction power grid is positive direction, it is known that two sides transient current related coefficient in external area error
Close to 1, in troubles inside the sample space, related coefficient is close to -1.Therefore Protection criteria can be according to the significant difference of related coefficient size
And it constructs.
Related coefficient does not consider line capacitance electric current, and route capacitance current in transient process close to 1 when external area error
The steady-state value up to several times is influenced by high fdrequency component, thus needs to consider influence of the transient state capacitance current to Protection criteria.When sending
When breaking down outside route system side out, fault traveling wave is propagated to after the refraction of system side bus and is sent out on route, forms line
Road transient state capacitance current；The inductance of wind power plant main transformer is larger, and the refraction coefficient at system side bus is close to 1, and transient state is electric at this time
Capacitance current amplitude very little.It is also such when sending out and breaking down outside route wind farm side.However, nearby being sent out when outside two lateral areas
When raw failure, fault point is located inside two side bus at this time, and for fault traveling wave without refraction, transient state capacitance current amplitude is larger, needs
Analyze its influence.
Specifically includes the following steps:
The electric current (data window a length of 10ms) long from a data window after the two sides acquisition failure for sending out route, utilizes formula
(1) related coefficient of certain phase current is calculated separately:
Wherein, variable x={ x1,x2,...,xn, y={ y1,y2,...,yn, n is sampling number, and r (x, y) is after calculating
Related coefficient, the value range of r (x, y) is to indicate that the waveform of two variables x and y become between+1~-1 as r (x, y) > 0
Law is positively correlated, and related coefficient indicates two variable change rules closer to identical, r (x, y) more connects closer to 1
It is bordering on -1, then it represents that the two changing rule is completely on the contrary, negatively correlated, when r (x, y) absolute value is close to 0, then it represents that two waves
Deformation law differs greatly, correlation is weaker；
If certain phase current correlation coefficient r (x, y), which is less than given threshold, (sets the threshold to 0.9, if related coefficient is less than
0.9, indicate that this mutually breaks down), then determine that sending out route has occurred troubles inside the sample space, this is mutually failure phase, protection act；
Separate greater than threshold value is judged to non-faulting phase, and the protection of corresponding phase is failure to actuate；
If certain phase current correlation coefficient r (x, y) is not less than given threshold, it is judged to external area error, protects involution.
The form that power grid is accessed in double-fed wind generating field is related with the size of wind power plant capacity, and there are mainly two types of web forms
Situation: capacity is greater than the large and medium-sized wind power plant of 50MW, and general concentrated by main transformer is boosted, and then accesses 110kV and the above voltage
The electric substation of grade；Low capacity wind power plant generally uses that T connects or π connects and connects in nearest in power distribution network.This patent is with large and medium-sized
Wind power plant is research object, and the physical component in grid-connected system has: Wind turbines, case become, collect electric line, bus rod, master
Change, high voltage bus, submitting route, system etc., schematic diagram is as indicated with 1.
In the 50MW double-fed fan motor field that Fig. 1 is built, using 110kV submitting line as research object, line parameter circuit value are as follows: positive sequence
Impedance R=132 × 10-6Ω/m, C=370.37M Ω m, L=380 × 10-6Ω/m；Zero sequence impedance R=396 × 10-6Ω/m,
C=1250M Ω m, L=1150 × 10-6Ω/m, total track length 40km, double-fed wind power generator group are put into after the failure occurred
Crow bar protection.Abort situation is arranged to send out among line at 20km, wind speed is 11m/s before failure, and four kinds of fault types connect for A
Ground, AB line to line fault, AB line to line fault ground connection, three-phase shortcircuit, sample frequency 1KHz.Current direction is with current direction infinity system
System is positive direction.For occurring to break down outside ABG failure and area in area, both ends current waveform figure is as shown in 2a and Fig. 2 b.
ISS is system side, and IS is wind farm side, and when double-fed fan motor field send cable connecting area to break down outside, it is mutual to send out line two sides
It is almost the same that sensor, which sends out current waveform changing rule,；And when send break down in cable connecting area when, such as ABG failure, two sides
The changing rule of transformer current waveform fault phase be it is opposite, changing rule correlation is not strong in other words.To different types of
Failure progress related coefficient calculating, sample frequency 1KHz, data window 10ms, calculated result are as shown in table 1 below.
Table 1
As can be seen from Table 1, when various types of failures occur in area, the related coefficient of failure phase is much smaller than 1, approaches
In -1, very strong negative correlation is showed, and the related coefficient of non-faulting phase can significantly distinguish the phase that is out of order close to 1.
In double-fed fan motor field, setting, which is sent out, occurs singlephase earth fault at route K1, failure occurs in 8s, continues
0.2s, failure are sending out route midpoint, and route two sides transformer parameter is identical, uses JA model: no-load voltage ratio 200/5, winding
Resistance is 0.5 Ω, and secondary side leakage inductance is 0.08H, and core section product is 2.6 × 10-4m2, it is bent that secondary side load meets 10% error
Line, emulation obtain mutual inductor and are saturated with current waveform when unsaturation as best shown in figures 3 a and 3b.
It can be seen from figs. 3a and 3b that the aperiodic component in transient current makes electric current after wind power plant sends out line fault
Mutual inductor has occurred saturated phenomenon, the current value that Current Transformer Secondary side obtains when unsaturation compared with obviously become smaller, electric current
Waveform is distorted.In view of the short circuit current meeting occurrence frequency offset that double-fed fan motor field is sent out, Fourier's power frequency algorithm is caused
Degradation, so that sending out circuit longitudinal differential protection sensitivity reduces, while saturation may also cause stalling current reduction, send
False protection when route external area error out.And transient-wave related protection method is based on transient current different wave shape, needs to test
Action performance when mutual inductor is saturated.Herein by setting remanent magnetism size, two kinds of mutual inductor models are established, remanence is
The model 2 of 200mT model 1 and 0T sends out route to 110kV and troubles inside the sample space progress protective value test occurs, and test result is such as
Shown in table 2:
Table 2
In conjunction with Tables 1 and 2 as can be seen that compared to unsaturated situation, after mutual inductor saturation, knot obtained by waveform relevant calculation
Fruit can be increased, and after saturation, the related coefficient of failure phase is up to 0.2913, and non-faulting phase related coefficient is minimum
0.9975, but failure phase mutually still has notable difference with non-faulting.This is because mutual inductor is saturated so that waveform exists centainly
Distortion, but it is close when the overall variation rule of waveform and unsaturation, while there is the linear transform area of 3~5ms before being saturated always,
So that waveform relatedness computation and unsaturated phase difference are little after failure generation, so selecting suitable threshold value, guarantor is still ensured that
The correct movement of shield.
It is analyzed with common singlephase earth fault anti-transition impedance ability is protected, setting transition impedance is 0,
30,60,100 Ω, abort situation are to send out route midpoint, and sample frequency and data window are still 1KHz, 10ms, the knot emulated
Fruit such as table 3.
Table 3
It is not difficult to find out that failure phase has obvious with non-faulting phase related coefficient calculated result in the case of different transition impedances
Difference, for failure phase related coefficient still close to -1, non-faulting phase waveform is related, close to 1, meets the threshold condition of setting, protects
It can correctly act.This is because protection, according to two sides transient current waveform, waveform comparison contains the size and phase of electric current.
Although short circuit current reduces with the size of transition impedance, short circuit current is always existed, failure and non-faulting phase transient state electricity
It is always different to flow waveform variation tendency, and then related coefficient also has notable difference, to protect in the case of ensure that transition impedance
The correct movement of shield.
The wind-field model built is tested, to being verified under different faults type, different wind conditions, is set
Wind speed is 8,11,13m/s.
Table 4
It is not difficult to find out that, failure phase related coefficient calculated result and non-faulting still have notable difference from table 4, can be correct
Differentiation failure and non-faulting phase, guard method to power frequency offset have certain resistivity.But in wind power plant, institute
There are Wind turbines in the case where the same time can not operate in same wind friction velocity, operated in front of failure under different wind conditions,
The offset frequency situation of electric current is also different, and whether guard method meets the needs of further verifying to the short circuit current after convergence.
Different works are operated in operate in the Wind turbines of three kinds of different operating conditions in wind power plant to simulate blower in wind power plant
This case that condition, No. 1 wind field operates in 8m/s wind speed, and No. 2 wind fields operate in 11m/s wind speed, and No. 3 wind fields operate in 13m/s wind
Speed, in three wind fields, blower quantity is 15.Selection in this way is so that frequency shift (FS) is more prominent, the waveform of electric current after failure
Have increasingly complex, and then verifies the adaptability protected in more serious situation.It is same as previously described to send out line parameter circuit value, therefore
Point in the line occurs for barrier.Each phase related coefficient calculating, calculated result such as table 5 are carried out in different faults to above-mentioned.
Table 5
By upper table 5 it is found that when wind power plant inner blower operates in different wind speed, protection to the wind field short circuit current after convergence into
Each phase related coefficient of row calculates, and remains to correctly identify failure phase and non-faulting phase.Wind field inner blower is run under different operating conditions, should
Guard method can correctly judge failure, simultaneously as being to carry out related coefficient calculating to each phase, protection has natural phase selection energy
Power.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made within the essential scope of the present invention also should belong to of the invention
Protection scope.
Claims (3)
1. the longitudinal differential protection method of double-fed fan motor field submitting route, which is characterized in that this method is based on wind power plant when failure
With system side failure current temporary state different wave shape, specifically includes the following steps:
The electric current long from a data window after the two sides acquisition failure for sending out route, calculates separately certain phase current using formula (1)
Related coefficient:
Wherein, variable x={ x1,x2,...,xn, y={ y1,y2,...,yn, n is sampling number, and r (x, y) is the phase after calculating
Relationship number, the value range of r (x, y) are to indicate that the waveform of two variables x and y change rule between+1~-1 as r (x, y) > 0
Rule is positively correlated, and related coefficient indicates two variable change rules closer to identical closer to 1；R (x, y) closer to-
1, then it represents that the two changing rule is completely on the contrary, negatively correlated；When r (x, y) absolute value is close to 0, then it represents that two waveforms become
Law differs greatly, correlation is weaker；
If certain phase current correlation coefficient r (x, y) is less than given threshold, determine that sending out route has occurred troubles inside the sample space, this is mutually
For failure phase, protection act；Separate greater than threshold value is judged to non-faulting phase, and the protection of corresponding phase is failure to actuate；
If certain phase current correlation coefficient r (x, y) is not less than given threshold, it is judged to external area error, protects involution.
2. the longitudinal differential protection method that route is sent out in double-fed fan motor field as described in claim 1, which is characterized in that described to incite somebody to action
Threshold value is set as 0.9, if related coefficient less than 0.9, indicates that this mutually breaks down.
3. the longitudinal differential protection method that route is sent out in double-fed fan motor field as described in claim 1, which is characterized in that the number
According to a length of 10ms of window.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112072609A (en) * | 2020-09-28 | 2020-12-11 | 国网山东省电力公司莱芜供电公司 | Method for adjusting action current of leakage protector |
| CN113872165A (en) * | 2021-10-27 | 2021-12-31 | 南方电网数字电网研究院有限公司 | Series compensation circuit pilot protection method and device, computer equipment and storage medium |
| CN114089121A (en) * | 2021-11-30 | 2022-02-25 | 华北电力大学（保定） | Wind power plant current collecting wire fault distance measuring method aiming at asymmetric grounding short circuit |
| CN114172119A (en) * | 2021-11-24 | 2022-03-11 | 中国电力科学研究院有限公司 | Method for longitudinal differential protection of main transformer of new energy station |
| CN115085164A (en) * | 2022-07-25 | 2022-09-20 | 华北电力大学 | Wind field outbound interactive protection method and system |
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| CN106786424A (en) * | 2017-01-10 | 2017-05-31 | 华北电力大学 | Send out method for pilot protection of circuit in new energy station based on current waveform similarity |
| CN109449899A (en) * | 2019-01-14 | 2019-03-08 | 华北电力大学 | A kind of longitudinal protection method based on Spearman rank correlation coefficient |
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Patent Citations (2)
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| CN106786424A (en) * | 2017-01-10 | 2017-05-31 | 华北电力大学 | Send out method for pilot protection of circuit in new energy station based on current waveform similarity |
| CN109449899A (en) * | 2019-01-14 | 2019-03-08 | 华北电力大学 | A kind of longitudinal protection method based on Spearman rank correlation coefficient |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112072609A (en) * | 2020-09-28 | 2020-12-11 | 国网山东省电力公司莱芜供电公司 | Method for adjusting action current of leakage protector |
| CN113872165A (en) * | 2021-10-27 | 2021-12-31 | 南方电网数字电网研究院有限公司 | Series compensation circuit pilot protection method and device, computer equipment and storage medium |
| CN113872165B (en) * | 2021-10-27 | 2024-06-04 | 南方电网数字电网研究院有限公司 | Pilot protection method and device for serial compensation line, computer equipment and storage medium |
| CN114172119A (en) * | 2021-11-24 | 2022-03-11 | 中国电力科学研究院有限公司 | Method for longitudinal differential protection of main transformer of new energy station |
| CN114089121A (en) * | 2021-11-30 | 2022-02-25 | 华北电力大学（保定） | Wind power plant current collecting wire fault distance measuring method aiming at asymmetric grounding short circuit |
| CN114089121B (en) * | 2021-11-30 | 2023-07-07 | 华北电力大学（保定） | Wind power plant electric wire collecting fault distance measurement method for asymmetric grounding short circuit |
| CN115085164A (en) * | 2022-07-25 | 2022-09-20 | 华北电力大学 | Wind field outbound interactive protection method and system |
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Application publication date: 20191126 |