CN102427222A - Verification processing method for relaying protection setting value - Google Patents

Abstract

The invention provides a verification processing method for a relaying protection setting value. The method comprises the following steps of: reading the real time data of a power grid from an energy management system, and forming a current system running mode; in the current system running mode, performing online verification calculation on a protection setting value of the power grid to judge whether protections which do not meet verification requirements exist or not; if the protections which do not meet the verification requirements exist, forming a set of the protections which do not meet the verification requirements; calculating the probabilities and results of failure to operate on command of each protection in the set, and multiplying corresponding probabilities and results to obtain values-at-risk of failure to operate on command of the protections; calculating the false operation probabilities and results of each protection in the set, and multiplying corresponding probabilities and results to obtain false operation values-at-risk of the protections; calculating the weighted sums of the values-at-risk of failure to operate on command and false operation values-at-risk of the protections to obtain total values-at-risk of the protections; and rearranging the total values-at-risk of all the protections in the set from lower values to higher values.

Description

The check processing method of relay protection constant value

Technical field

The present invention relates to the technical field of relay protection of AC transmission system, more particularly, the present invention relates to a kind of check processing method of relay protection constant value.

Background technology

The main feature of China's electrical network is that operational mode is flexible, fault type is complicated, equivalent impedance changes and load fluctuation etc.; These factors are adjusted for the relaying protection off-line and are brought immense pressure and challenge: in case the discontented foot protection requirement of definite value occurs; Protection just possibly broken down, and then causes power grid accident.

To above problem, the constant value on-line check method is widely used in China's electrical network.Constant value on-line check utilizes the Power System Real-time data of EMS collection to come the performance of all protections of judgement system under real time operation mode.In case exist protection tripping/malfunction hidden danger online, online check method will provide warning message.Since the notion of online check proposed, the relaying protection worker and the software for calculation developer that adjusts had carried out a large amount of research, and have developed the corresponding online nucleus correcting system.

Yet along with the deep application of online nucleus correcting system at electrical network, the staff faces a such difficult problem: for provincial or region class electrical network in large scale, that operational mode is changeable; It is many that check calculates the number that does not satisfy the protection of checking requirement; The staff needs at short notice the definite value of all protections to be revised, and manual work is carried out but the order of priority of definite value correction places one's entire reliance upon, the lack of scientific foundation; The enforcement difficulty is big, and efficient is lower.

Summary of the invention

In view of this; The object of the present invention is to provide a kind of check processing method of relay protection constant value; It after check calculating is accomplished, automatically needs is implemented the definite value correction and serializing is carried out in perfect protection, thereby helps relaying protection staff and the quick rational definite value maintenance scheme of formulation of management and running personnel and mode to arrange strategy.

The invention provides a kind of check processing method of relay protection constant value, may further comprise the steps: read the real time data of the electrical network that EMS passes over, form current system operation mode; Under current system operation mode; The protection definite value of electrical network is carried out online check calculate, check the protection that requires, check the protection that requires if exist not satisfy to determine whether to exist not satisfy; Then will not satisfy and check the set of protection formation that requires; The tripping probability of each protection in the set of computations and tripping consequence, and both multiply by the tripping value-at-risk that is protected, the malfunction probability of each protection in the set of computations and malfunction consequence mutually; And both multiply by mutually the malfunction value-at-risk that is protected; The tripping value-at-risk and the malfunction value-at-risk of protection are carried out weighted sum,, the overall risk value of all protections in the set is arranged according to order from big to small again with the overall risk value that is protected.

The check processing method of relay protection constant value of the present invention has the following advantages:

1) in many satisfied quantification orderings of making check result in the protection that requires rapidly of checking, helps the staff and in time make the relevant strategy of assisting;

2) be easy to expose protection hidden danger under the extreme operational mode, be easy to find definite value and electrical network weak link, help to promote the fail safe and the reliability of electric power system;

3) this invention is not limited by scale of power basically, but its effect is more obvious with advantage in the domain type electrical network wide in compass of competency, that changes of operating modes is big;

4) the present invention helps relaying protection staff and management and running personnel to formulate rational definite value maintenance scheme and mode fast to arrange the strategy can; Reduced staff's labour intensity; Improve the reasonability that power system operating mode is arranged simultaneously, helped to promote the practicalization of relay protection on-line check system.

Description of drawings

Fig. 1 is the flow chart of the check processing method of relay protection constant value of the present invention.

Fig. 2 is the analysis sketch map of tripping probability.

Fig. 3 is the analysis sketch map of malfunction probability.

Embodiment

As shown in Figure 1, the check processing method of relay protection constant value of the present invention may further comprise the steps:

(1) reads the real time data of the electrical network that EMS passes over, form current system operation mode;

(2) under said current system operation mode, the protection definite value of said electrical network is carried out online check calculate, check the protection that requires to determine whether to exist not satisfy;

(3) if there is the dissatisfied protection that requires of checking, then will not satisfy and check the set of protection formation that requires, change step (4) then over to; Do not check the protection that requires if do not exist not satisfy, then check processing method and finish;

(4) calculate the tripping probability and the tripping consequence of each protection in the said set, and both multiply by the tripping value-at-risk that obtains said protection mutually;

(5) calculate the malfunction probability and the malfunction consequence of each protection in the said set, and both multiply by the malfunction value-at-risk that obtains said protection mutually;

(6) the tripping value-at-risk and the malfunction value-at-risk of said protection are carried out weighted sum, to obtain the overall risk value of said protection;

(7) the overall risk value of all protections in the said set is arranged according to order from big to small again.

In step (2), mainly be that the protection range according to the operate time of protecting, definite value, the sensitivity of definite value require to wait the protection that determines whether to exist satisfied check to require.

As shown in Figure 2, describe above-mentioned steps (4) in detail below in conjunction with example:

Suppose that this circuit is designated as circuit AB and BC respectively with adjacent lines in the electrical network, the distance protection of configuration is respectively R ₁And R ₂, below with the protection R ₁Be that example is calculated its tripping value-at-risk apart from the II section:

(41) confirm R ₁The tripping probability

Z among the figure _LmBe guarantor's Calculation of Sensitivity definite value,

Be R ₁Apart from II section actual motion definite value; The check requirement is not satisfied in sensitivity, is equivalent to Both are pressed sensitivity coefficient K _LmBe mapped as protection range L after the scaled down respectively _LmWith

Wherein, L _Lm=Z _Lm/ K _Lm, Be that protection range is contracted to the AD section by the AB section, shadow section (DB section) is protection tripping scope.Finally, R ₁Tripping scope and tripping probability are:

$P_{\mathrm{sen}}\left(n\right)=\frac{(Z_{\mathrm{lm}}-Z_{\mathrm{set}1}^{\mathrm{II}})/K_{\mathrm{lm}}}{Z_{L_{\mathrm{AB}}}}---\left(1\right)$

$P_{\mathrm{sen}}=P_{\mathrm{sen}}\left(n\right)\·(1-e^{-{\mathrm{\λ}}_{\mathrm{AB}}T})---\left(2\right)$

Wherein, P _Sen(n) be R ₁The tripping scope, P _SenBe R ₁The tripping probability; Be circuit AB impedance; T is the EMS Data Update cycle; λ _ABBe the failure rate of circuit AB in time T,, can replace, obtain through historical record by the frequency that fault takes place because timing statistics is shorter.

(42) confirm R ₁The tripping consequence

The tripping consequence is to be represented by the relative load loss that tripping causes.Suppose under previous mode R ₁The real-time load crossed of online AB and upper level link tester be respectively c _ABAnd c _Pre, can from the real time data file that EMS sends over, obtain; AB breaks down when circuit, should be by R ₁Action, load loss is c _ABBut, cause its upper level protection R because sensitivity is not enough ₁Action, the load of result's loss becomes c _PreR then ₁The tripping consequence is:

c _sen＝|c _pre-c _AB|/c _N (3)

Wherein, c _SenBe R ₁The tripping consequence; c _NFor the whole network load fiducial value, characterize with active power.

(43) confirm R ₁The tripping value-at-risk

By above-mentioned steps (41) and (42),, can obtain R in conjunction with the definition of risk ₁The risk R that checks protection tripping when requiring is not satisfied in sensitivity _SenFor:

R _sen＝P _sen?c _sen (4)

Promptly obtain R ₁The risk of tripping; Check risk, method and above-mentioned similar for the sensitivity of III section.

As shown in Figure 3, describe above-mentioned steps (5) in detail below in conjunction with example:

Suppose that this circuit is designated as circuit AB and BC respectively with adjacent lines in the electrical network, the distance protection of configuration is respectively R ₁And R ₂, below with the protection R ₁Apart from II section and adjacent protection R ₂Apart from the cooperation of I section is that example is calculated R ₁The malfunction value-at-risk:

(51) confirm R ₁The malfunction probability

Z _JsCalculate definite value for protecting to protecting selectivity,

Be R ₁Apart from II section actual motion definite value; Selectivity does not satisfy checks requirement, is equivalent to

With Z _JsWith

Corresponding scope is in the reduction of safety factor ratio, i.e. Z _JsCorresponding A D section

Corresponding A E section Shadow section among the figure (DE section) is for protection malfunction scope, so R ₁Malfunction scope and malfunction probability are:

$P_{\mathrm{sel}}\left(n\right)=\min \{\frac{(Z_{\mathrm{set}1}^{\mathrm{II}}/K_k-Z_{L_{\mathrm{AB}}})/K_{\mathrm{fz}\min }-Z_{\mathrm{set}2}^I}{Z_{L_{\mathrm{BC}}}},1\}---\left(5\right)$

$P_{\mathrm{sel}}=P_{\mathrm{sel}}\left(n\right)\·\left(1-e^{-{\mathrm{\λ}}_{\mathrm{BC}}T}\right)---\left(6\right)$

Wherein, P _Sel(n) be R ₁The malfunction scope, P _SenBe R ₁The malfunction probability; Be circuit BC impedance; K _kBe safety factor; K _{Fz min}For helping, minimum under the current system operation mode increases coefficient;

Be R ₂Apart from I section definite value; λ _BCBe the failure rate of circuit BC in time T.

Other matching principles in the distance protection such as joining, cooperate apart from the II section apart from II section and adjacent lines being vertical, cooperate with adjacent lines II section, III section apart from the III section, and its selectivity check method and malfunction probability are all with above-mentioned similar.

(52) confirm R ₁The malfunction consequence

The malfunction consequence is represented with the relative load loss that malfunction causes.Suppose under previous mode R ₂The real-time load that passes through of online BC be c _BCBC breaks down when circuit, because fault drops on protection R ₁In the weak scope that cooperates with it, cause R ₁Malfunction, its consequence is:

c _sel＝|c _AB-c _BC|/c _N (7)

Wherein, c _SelBe R ₁The malfunction consequence.

(53) confirm R ₁The malfunction value-at-risk

By above-mentioned steps (51) and (52),, can obtain R in conjunction with the definition of risk ₁Selectivity does not satisfy the risk R that checks protection malfunction when requiring _SelFor:

R _sel＝P _sel?c _sel (8)

Below still with protection R ₁Be example, describe above-mentioned steps (6) in detail.

Protection R ₁The overall risk value be:

R＝δ _senγ _senR _sen+δ _selγ _sel·max{R _sel(j)}，1≤j≤m (9)

Wherein, R is protection R ₁The overall risk value; δ _SenAnd δ _SelBe the sign coefficient: satisfy if sensitivity is checked, then δ _SenGet 0, otherwise get 1; If checking, selectivity satisfies, then δ _SelGet 0, otherwise get 1; γ _SenAnd γ _SelBe respectively sensitivity and selectivity weight coefficient, scope is 0～1, and γ _Sen+ γ _Sel=1, both balances need combine the concrete power grid environment at this circuit place; Work as R ₁Cooperation circuit when having many, R ₁Need to carry out selectivity with each mating protection and check, as long as m representes that selectivity does not satisfy (mating protection) number of checking requirement, and is visible m＞0, then δ _SelJust get 1.

The present invention is not limited to above-mentioned embodiment; Persons skilled in the art are according to specification and the disclosed content of accompanying drawing; Can adopt other multiple embodiment embodiment of the present invention, therefore, every employing thinking of the present invention; Do some simple designs that change or change, all fall into the scope of the present invention's protection.

Claims (1)

1. the check processing method of a relay protection constant value may further comprise the steps:

Read the real time data of the electrical network that EMS passes over, form current system operation mode;

Under said current system operation mode, the protection definite value of said electrical network is carried out online check calculate, check the protection that requires to determine whether to exist not satisfy;

If there is the dissatisfied protection that requires of checking, then will do not satisfy and check the set of protection formation that requires;

Calculate the tripping probability and the tripping consequence of each protection in the said set, and both multiply by the tripping value-at-risk that obtains said protection mutually;

Calculate the malfunction probability and the malfunction consequence of each protection in the said set, and both multiply by the malfunction value-at-risk that obtains said protection mutually;

The tripping value-at-risk and the malfunction value-at-risk of said protection are carried out weighted sum, to obtain the overall risk value of said protection;

The overall risk value of all protections in the said set is arranged according to order from big to small again.

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