CN101813739A - Adaptive three-phase symmetric fault phase selecting method for ultra high voltage transmission line - Google Patents
Adaptive three-phase symmetric fault phase selecting method for ultra high voltage transmission line Download PDFInfo
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Abstract
The invention provides an adaptive three-phase symmetric fault phase selecting method for an ultra high voltage (UHV) transmission line. The method comprises the following steps: adopting three-phase current on a fault circuit; calculating a zero-sequence current component, determining whether the zero-sequence current component exists or not, and respectively determining a threshold value Iset and a margin ratio Kset in three-phase symmetric fault phase selecting element criterion according to existence or not of the zero-sequence current component; calculating three-phase current break-variables delta IA, delta IB and delta IC; determining whether the amplitudes of the three-phase current break-variables are more than the set threshold value; and determining whether a ratio K between the maximum break-variable and the minimum break-variable in the calculated three-phase current is less than the definite value Kset of the set margin ratio or not. The method has reliable phase selection result and high action speed, can accurately and quickly select three-phase faults when convertible three-phase faults occur; and the provided three-phase symmetric fault phase selecting element is not affected by a transition resistor, and the transition resistor accelerates decay rate of a transient state component and ensures the break-variable to be reduced in asymmetric fault, thus being in favor of selection of three-phase fault.
Description
Technical field
The present invention relates to a kind of power system transmission line relay protection field, particularly relate to a kind of UHV transmission line self-adaptation three-phase symmetric fault that is applicable to and select the method for phase.
Background technology
The operating experience that the negative sequence direction longitudinal protection has a long history and enriches.UHV transmission line is long, and distributed capacitance is big, and the actuating range of directional element is big, be half plane, through a large amount of thinking, the negative sequence direction longitudinal protection can be used as the scheme of extra high voltage line main protection.The phase spacing of UHV transmission line is generally more than 15 meters, three-phase fault possibility fully simultaneously is very little, all there be in short-term asymmetric the first moment of most of three-phase fault, but because the window problem of striding of filtering algorithm, and the influence of transient state fault component, after fault is converted to three-phase fault about 10ms, try to achieve the uneven negative sequence voltage of this moment by filtering algorithm, electric current is still bigger, be difficult to be limited with the amplitude threshold of negative-sequence current, as shown in Figure 1, transverse axis is the time among the figure, and fault occurs in 0 constantly, and the longitudinal axis is respectively negative sequence voltage, the amplitude of electric current.As seen, uneven negative sequence voltage, electric current are bigger, may cause the negative-sequence direction component incorrect operation.Consider this situation; the phase selection element that in the action logic of negative-sequence direction component, should add the three-phase symmetric fault; require this element should have responsiveness faster; its responsiveness is greater than the responsiveness of protection; in case fault by asymmetric develop into three symmetrical; can the quick lock negative-sequence direction component, the block signal that comes as the other side.Phase selection element is for when the single-line to ground fault in the general protective device, selects the mutually single-phase tripping operation of fault, three-phase tripping operation when two-phase and three-phase shortcircuit.And the purpose of the three-phase unbalanced fault phase selection element of herein setting up is to judge whether to have taken place the three-phase symmetric fault, when take place be unbalanced fault the time do not need the type of right title fault to be distinguished yet.In addition, on the protection philosophy of some special reaction three-phase symmetric faults, also need to adopt the three-phase fault phase selection element.Utilizing the preface component to select when selecting single-phase fault with phase-to phase fault to be better than fault component mutually and select phase, but do not have negative phase-sequence and zero-sequence current component in theory during three-phase fault, is impossible so use that the preface component selects mutually; And if use phase current difference sudden change amount phase selection element, works: Hu Ting, the trip sea, gold bright " a kind of discussion of jump-value of current phase selection element three-phase shortcircuit criterion ", Electric Power Automation Equipment, 2006,26 (10): propose in the 107-109 page or leaf, because the influence of transient state component during fault, this phase selection element often are two-phase short-circuit fault with the erroneous judgement of three-phase symmetric fault.Therefore, the existing phase scheme of selecting all can not reliably be judged three-phase shortcircuit, needs to propose new three-phase symmetric fault phase selection element.
Summary of the invention
Technical matters to be solved by this invention is, a kind of UHV transmission line that is applicable to is provided, it selects phase reliable results, quick action, can select the UHV transmission line self-adaptation three-phase symmetric fault that is applicable to of three-phase fault to select the method for phase when changing property three-phase fault correctly, fast.
The technical solution adopted in the present invention is: a kind of UHV transmission line self-adaptation three-phase symmetric fault that is applicable to selects the method for phase, comprises the steps:
1) three-phase current on the employing faulty line;
2) ask for zero-sequence current component, judge whether zero-sequence current component exists, whether have to come the threshold value I that determines respectively in the three-phase symmetric fault phase selection element criterion according to zero-sequence current component
SetCompare K with nargin
Set, the threshold value when promptly setting the non-zero-sequence current component respectively and nargin than and threshold value and nargin ratio when having zero-sequence current component;
3) obtain three-phase current sudden change amount Δ I
A, Δ I
BWith Δ I
C
4) judge that whether the amplitude of three-phase current sudden change amount is all greater than the threshold value of setting;
Be min (Δ I
A, Δ I
B, Δ I
C)＞I
Set
If top inequality is false, judge that then fault is a unbalanced fault;
If top inequality is set up, then further ask the ratio K=Δ I of maximum sudden change amount and minimum sudden change amount in the three-phase current sudden change amount
Max/ Δ I
Min
5) judge in the three-phase current obtained the ratio K between maximum sudden change amount and minimum sudden change amount whether less than the nargin of having set than definite value K
Set
Be K＜K
Set
If top inequality is false, then be out of order is unbalanced fault;
If top inequality is set up, judge that then break down is three-phase fault.
Described threshold value I when having zero-sequence current component
Set=I
Set0, nargin compares K
Set=K
Set0, wherein: I
SetBe threshold value, K
SetBe nargin ratio, I
Set0And K
Set0For setting constant.
Getting threshold value during described non-zero-sequence current component is I
Set=0.5I
Set0, nargin is than for K
Set=2K
Set0, wherein: I
SetBe threshold value, K
SetBe nargin ratio, I
Set0And K
Set0For setting constant.
The UHV transmission line self-adaptation three-phase symmetric fault that is applicable to of the present invention selects the method for phase; taken into full account the claimed quick action of UHV transmission line; and the big characteristics of transient state component influence; the application self-adapting principle; proximity to three-phase current sudden change amount is differentiated; if three-phase current sudden change amount is close and greater than threshold value then be judged to the three-phase symmetric fault, otherwise be judged to unbalanced fault.Have following characteristics:
(1) this patent is carried the three-phase symmetric fault and is selected facies principle to be applicable to UHV transmission line, and it selects phase reliable results, quick action, can select three-phase fault correctly, fast when changing property three-phase fault;
(2) carry three-phase symmetric fault phase selection element and not influenced by transition resistance, and transition resistance is accelerated the rate of decay of transient state component and made the sudden change amount reduce all to help the selection of three-phase fault during unbalanced fault.
Description of drawings
Fig. 1 is converted to the negative sequence voltage of three-phase fault, the situation of change of current amplitude at 5ms moment unbalanced fault;
Wherein, (a) be negative sequence voltage; (b) be negative-sequence current
Fig. 2 is a process flow diagram of the present invention;
Fig. 3 is a 1000kv UHV transmission line system.
Embodiment
Select mutually method to make a detailed description with accompanying drawing to the UHV transmission line self-adaptation three-phase symmetric fault that is applicable to of the present invention below in conjunction with embodiment.
The present invention passes through three-phase current sudden change amount Δ I
A, Δ I
B, Δ I
CDifferentiation and relatively carry out the judgement of three-phase fault.In when, on the circuit three-phase fault taking place when, this moment, the ABC three-phase current all had sudden change amount and three-phase sudden change amount size under the situation of considering transient component not to equate, yet, during real system generation three phase short circuit fault, because the influence of transient state component, especially transient state component is abundant on UHV transmission line, has very big deviation between the three-phase sudden change amount.Consider the characteristics and the requirement of the three-phase symmetric fault being selected mutually of UHV transmission line, the startup principle of determining three-phase symmetric fault phase selection element is that three-phase all has sudden change amount and three-phase sudden change amount equal substantially.Be divided into three kinds of situations:
One, when three-phase current all has sudden change:
Three-phase current sudden change amount amplitude is all greater than certain threshold value:
min(ΔI
A，ΔI
B，ΔI
C)＞I
set (1)
I
Set---threshold value.
Two, when three-phase sudden change amount equates substantially:
A. consider that protection action is fast, because transient state aperiodic component and harmonic component be to the influence of filtering algorithm, three-phase sudden change amount to each other can be inequality during three-phase fault, but with respect to unsymmetrical short-circuit, its difference is little, is close each other basically;
B. when two phase ground and singlephase earth fault since zero-sequence mutual inductance and transient state component to the influence of filtering algorithm, non-fault all has certain sudden change amount mutually.
According to above-mentioned factor, the criterion that present principles equates substantially to three-phase sudden change amount adopts in the three-phase current maximum sudden change amount to judge with the ratio between minimum sudden change amount whether it equates, this ratio can be referred to as the nargin ratio, represents that with K formula is as follows:
K＝ΔI
max/ΔI
min (2)
Promptly ask for K, with the nargin that configures in advance than definite value K
SetRelatively, if nargin than K less than nargin than definite value K
SetIllustrate that three-phase sudden change amount is approaching, what promptly think generation this moment is three-phase fault, otherwise explanation generation this moment is unbalanced fault.Discriminant is as follows:
K＜K
set (3)
K
Set---nargin compares definite value.
Three, the application self-adapting principle is chosen definite value:
Set up two cover definite values, the first cover definite value is definite value to be measured in sudden change be taken as I
Set=I
Set0Be taken as K with nargin than definite value
Set=K
Set0The second cover definite value is definite value to be measured in sudden change be taken as I
Set=0.5I
Set0, nargin is taken as K than definite value
Set=2K
Set0Two choosing of definite value of cover are according to whether zero-sequence current component is arranged after the fault.
Owing to the influence of zero-sequence mutual inductance, non-fault phase current has the sudden change amount when two phase ground and singlephase earth fault, and this can make the minimum value Δ I of three-phase current sudden change amount
MinNear sudden change amount threshold value I
Set, nargin is reduced and near K than K
SetTherefore, may judge by accident and be three-phase fault.
The facies principle that selects involved in the present invention judges at first whether zero-sequence current component (it is little that zero-sequence component is influenced by fault transient component) exists, if there is not zero-sequence current component after the fault, then three-phase fault or phase to phase fault take place this moment in explanation.Next only need distinguish three-phase fault and phase to phase fault, non-fault does not have the sudden change amount mutually during because of phase to phase fault, even if considered the influence of transient state process to filtering algorithm, the sudden change amount that non-fault is tried to achieve mutually is also very little mutually with respect to fault, the nargin of trying to achieve during phase to phase fault is very bigger than K, is far longer than nargin than definite value K
Set, the sudden change amount definite value that therefore is provided with in the second cover definite value reduces to increase than definite value with nargin, can increase the sensitivity of three-phase fault phase selection element, does not influence the differentiation to three-phase fault and phase to phase fault simultaneously.
As shown in Figure 2, the UHV transmission line self-adaptation three-phase symmetric fault that is applicable to of the present invention selects the method for phase, specifically comprises the steps:
1) three-phase current on the employing faulty line;
2) ask for zero-sequence current component, judge whether zero-sequence current component exists, whether have to come the threshold value I that determines respectively in the three-phase symmetric fault phase selection element criterion according to zero-sequence current component
SetCompare K with nargin
Set, the threshold value when promptly setting the non-zero-sequence current component respectively and nargin than and threshold value and nargin ratio when having zero-sequence current component;
Described threshold value I when having zero-sequence current component
Set=I
Set0, nargin compares K
Set=K
Set0, wherein: I
SetBe threshold value, K
SetBe nargin ratio, I
Set0And K
Set0For setting constant.。
Getting threshold value during described non-zero-sequence current component is I
Set=0.5I
Set0, nargin is than for K
Set=2K
Set0, wherein: I
SetBe threshold value, K
SetBe nargin ratio, I
Set0And K
Set0For setting constant.
3) obtain three-phase current sudden change amount Δ I
A, Δ I
B, Δ I
C
The described three-phase current sudden change amount Δ I that obtains
A, Δ I
BWith Δ I
CBe to adopt following formula:
Δi
A(k)＝i
A(k)-i
A(k-2N)。
4) judge that whether the amplitude of three-phase current sudden change amount is all greater than the threshold value of setting, i.e. min (Δ I
A, Δ I
B, Δ I
C)＞I
SetIf top inequality is false, judge that then fault is a unbalanced fault; If top inequality is set up, then further ask the ratio K=Δ I of maximum sudden change amount and minimum sudden change amount in the three-phase current sudden change amount
Max/ Δ I
Min
5) judge in the three-phase current obtained the ratio K between maximum sudden change amount and minimum sudden change amount whether less than the nargin of having set than definite value K
Set
Be K＜K
Set
If top inequality is false, then be out of order is unbalanced fault;
If top inequality is set up, judge that then break down is three-phase fault.
Be example so that line to line fault (establishing the BC phase to phase fault) to take place below, the present invention and phase current difference sudden change amount phase selection element compared:
The phase current difference of two faults alternate (establishing the BC phase to phase fault) is
Two other phase current difference is
Therefore, try to achieve nargin than K=Δ I during phase to phase fault
Max/ Δ I
Min=2.And during the three-phase symmetric fault, as seen nargin, utilize phase current difference sudden change amount to select phase than K=1 in theory, and when phase to phase fault and three-phase fault, the nargin ratio is respectively 2 and 1, and its discrimination is very little.If transient state component influence when considering the UHV transmission line fault, then phase current difference sudden change amount phase selection element can't be distinguished three-phase fault and phase to phase fault at all.
Self-adaptation difference of phase currents phase selection element proposed by the invention, non-fault sudden change amount mutually is very little (to establish the BC phase to phase fault) when phase to phase fault, can think Δ I
A=0, so nargin is K=Δ I than in theory for infinity
Max/ Δ I
Min=∞, and in fact nargin is very big value than also, therefore can clearly judge three-phase fault and phase to phase fault.Simulation result has proved that also in the judgement of three-phase fault, the present invention carries three-phase symmetric fault phase selection element and adopts the difference of phase currents principle obviously to be better than phase current difference sudden change amount phase selection element.
Be three-phase symmetric fault phase selection element simulation result below:
Realistic model is that electric pressure is 1000kV, protected circuit total length 500km.During normal the operation, two side system electromotive force angles are 65 degree.K
1Be troubles inside the sample space, K
2Be external area error.Constant I
Set0(rated current is made as transmission natural power current effective value down to elect 0.075～0.15 times of rated current as
), constant K
Set0Elect 6 as.Simulation step length 0.5ms; The condition that is judged as three-phase fault is at continuous 5 has be judged to three-phase fault at 3, promptly 5 gets 3.Simulation result sees Table 1.
Table 1 simulation result
By simulation result as can be known, three-phase symmetric fault phase selection element quick action; For asymmetric three-phase fault in short-term; three-phase symmetric fault phase selection element 2.5-4ms after fault is converted to three-phase fault can declare fast and three-phase fault, has avoided unbalanced fault to be converted into behind the symmetric fault because the influence of striding window and transient state component of filtering algorithm causes negative sequence direction longitudinal protection malfunction problem.
Fig. 3 is a 1000kv UHV transmission line system, and the concrete parameter of this system is as follows:
r
1＝0.00805Ω/km L
1＝0.82525e-3H/km?C
1＝14.03699e-9F/km
r
0＝0.20489Ω/km L
0＝2.37599e-3H/km?C
0＝9.03439e-9F/km
Claims (3)
1. one kind is applicable to that UHV transmission line self-adaptation three-phase symmetric fault selects the method for phase, it is characterized in that, comprises the steps:
1) three-phase current on the employing faulty line;
2) ask for zero-sequence current component, judge whether zero-sequence current component exists, whether have to come the threshold value I that determines respectively in the three-phase symmetric fault phase selection element criterion according to zero-sequence current component
SetCompare K with nargin
Set, the threshold value when promptly setting the non-zero-sequence current component respectively and nargin than and threshold value and nargin ratio when having zero-sequence current component;
3) obtain three-phase current sudden change amount Δ I
A, Δ I
BWith Δ I
C
4) judge that whether the amplitude of three-phase current sudden change amount is all greater than the threshold value of setting;
Be min (Δ T
A, Δ T
B, Δ I
C)＞I
Set
If top inequality is false, judge that then fault is a unbalanced fault;
If top inequality is set up, then further ask the ratio K=Δ I of maximum sudden change amount and minimum sudden change amount in the three-phase current sudden change amount
Max/ Δ I
Min
5) judge in the three-phase current obtained the ratio K between maximum sudden change amount and minimum sudden change amount whether less than the nargin of having set than definite value K
Set
Be K＜K
Set
If top inequality is false, then be out of order is unbalanced fault;
If top inequality is set up, judge that then break down is three-phase fault.
2. the UHV transmission line self-adaptation three-phase symmetric fault that is applicable to according to claim 1 selects the method for phase, it is characterized in that, described threshold value I when having zero-sequence current component
Set=I
Set0, nargin compares K
Set=K
Set0, wherein: I
SetBe threshold value, K
SetBe nargin ratio, I
Set0And K
Set0For setting constant.
3. the UHV transmission line self-adaptation three-phase symmetric fault that is applicable to according to claim 1 selects the method for phase, it is characterized in that, getting threshold value during described non-zero-sequence current component is I
Set=0.5I
Set0, nargin is than for K
Set=2K
Set0, wherein: I
SetBe threshold value, K
SetBe nargin ratio, I
Set0And K
Set0For setting constant.
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| CN102608495A (en) * | 2012-03-02 | 2012-07-25 | 华北电力大学 | Fault phase selection method based on current break variable |
| CN102879668A (en) * | 2012-09-17 | 2013-01-16 | 华南理工大学 | Asymmetric fault analysis method for power distribution network including inverted distribution type power supply |
| CN103207346A (en) * | 2013-03-13 | 2013-07-17 | 福建省电力有限公司 | Power transmission line fault phase selection method |
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| CN101813739B (en) | 2012-01-04 |
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