CN102983567A - Assessment method of power grid lifeline - Google Patents
Assessment method of power grid lifeline Download PDFInfo
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- CN102983567A CN102983567A CN2012104498360A CN201210449836A CN102983567A CN 102983567 A CN102983567 A CN 102983567A CN 2012104498360 A CN2012104498360 A CN 2012104498360A CN 201210449836 A CN201210449836 A CN 201210449836A CN 102983567 A CN102983567 A CN 102983567A
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Abstract
The invention relates to an assessment method of a power grid lifeline. The assessment method of the power grid lifeline considers the effect of the difference of meteorological conditions and construction standards, and defines the fault rate, repair rate and equivalent unavailability of a power grid component under the different meteorological conditions and construction standards, thereby enabling the assessment method of the power grid lifeline to achieve effective assessment to the power grid lifeline. In addition, the assessment method of the power grid lifeline further can, and quantitatively reflect the improvement effect of the implement of a lifeline project improve on the reliability of an existing power grid through comparative analysis with a lifeline or with no lifeline.
Description
Technical field
The present invention relates to the power grid security field, particularly a kind of electrical network appraisal procedure.
Background technology
In recent years, global climate is unusual, and extreme natural calamity takes place frequently, and day by day obtains paying attention to the safety problem of the closely-related electrical network of national economy.The enforcement of electrical network lifeline engineering can effectively increase the anti-disaster ability of electrical network, and the core of electrical network lifeline engineering is to seek the fragile node and relevant passway for transmitting electricity of electrical network.Carry out newly-built or transform circuit with higher construction criteria, in the hope of under extreme natural calamity, preserving the key rack of electrical network, for important load is powered continuously, and provide the startup power supply for follow-up power system restoration.Traditional electric network reliability appraisal procedure does not relate to the relevant problem of differentiation construction, is difficult to satisfy the specific (special) requirements of lifeline electric network reliability assessment.
Summary of the invention
For solving the problems of the technologies described above, the invention discloses a kind of appraisal procedure of electrical network lifeline, it is characterized in that described method comprises the steps:
(a) according to the network topology structure of described electrical network, the construction criteria parameter of the line parameter circuit value of each branch road and each node parameter and every circuit in the initialization electrical network, and be conventional construction criteria with the construction criteria parameter initialization of every circuit in the electrical network;
(b) the initial sample number of times is set
k=1 and total frequency in sampling
k=N, wherein: described total frequency in sampling N decides on Evaluation accuracy, and required precision is higher, and the N value is larger;
(c) according to the complexity of electrical network place geographical conditions, meteorological condition is divided into the n class, and scale and the Evaluation accuracy of foundation electrical network to be assessed, electrical network is refined as m grid, then this electrical network is total
n m Plant possible climate state, and the geographic area at each grid place the probability of a certain meteorological condition appears from statistics or from the acquisition of local meteorological department;
(d) every in electrical network circuit is numbered, supposes to amount to R bar circuit in the described electrical network, then to the i bar circuit in the electrical network, have: 1≤i≤R, and i is natural number, and the i initial value is 1, and to the construction criteria K_cs[i of every circuit] assignment is numerical value corresponding to described conventional construction criteria;
(e) suppose to comprise j meteorological condition in the zone of i bar line crossing, 1≤j≤n is obviously arranged, and j is natural number, be the j section with this i bar circuit equivalence then, and this i bar circuit amounts to by j different two-terminal element series connection, wherein j two-terminal element of i bar circuit is by failure rate λ [i] [j], repair rate μ [i] [j] and this two-terminal element equivalence degree of unavailability s[i] [j] description, and the element λ [i] [j] among two-dimensional array λ and the μ and μ [i] [j] all are meteorological condition K_w[i of i bar circuit j section] [j] and i bar line construction standard K _ cs[i] function, element s[i among the two-dimensional array s] [j] be the function of λ [i] [j] and μ [i] [j], and be specific as follows:
Wherein, K_w[i] [j] determined by the probability of meteorological condition in the i bar circuit j section institute grid coverage scope,
l[i] [j] expression j section accounts for the percentage of this i bar circuit overall length; The equivalent degree of unavailability ss[i of i bar circuit] equal s[i] [1], s[i] [2] ..., s[i] and [j] sum; Then, i is accumulated once;
(f) circulation execution in step (e), until i=R, thereby obtain ss[1], ss[2] ..., ss[R] and amount to the equivalent degree of unavailability of R bar circuit; Because ss[1], ss[2] ..., ss[R] and self is all less than 1, so extract in [0,1]
RIndividual random number t[k], wherein 1≤i≤R, and k is natural number, the k initial value is 1, from k=1 to k=R, compares one by one ss[k] and t[k]: as ss[k] 〉=t[k] time, then judge line fault, faulty line is excised; Otherwise circuit is normal, thereby obtains at random a definite system of described electrical network;
(g) for described system, carry out trend and calculate, the reliability index of statistics whole system and each node; And k accumulated once;
(h) circulation execution in step (e), (f), (g) are until k=
NThereby, statistics whole system and the final reliability index of each node;
(i) with the height ordering of all nodes according to reliability index, it is minimum to select reliability
ZAt node, the circuit that is attached thereto is defined as the lifeline circuit to individual node, wherein as the lifeline substation
ZValue with reference to the actual construction requirements of electrical network, for described lifeline transformer station and described lifeline circuit, implement electrical network lifeline construction criteria.
Embodiment
In order to solve the problems of the technologies described above, a kind of appraisal procedure of electrical network lifeline is disclosed in one embodiment of the present of invention, it is characterized in that described method comprises the steps:
(a) according to the network topology structure of described electrical network, the construction criteria parameter of the line parameter circuit value of each branch road and each node parameter and every circuit in the initialization electrical network, and be conventional construction criteria with the construction criteria parameter initialization of every circuit in the electrical network;
(b) the initial sample number of times is set
k=1 and total frequency in sampling
k=N, wherein: described total frequency in sampling N decides on Evaluation accuracy, and required precision is higher, and the N value is larger;
(c) according to the complexity of electrical network place geographical conditions, meteorological condition is divided into the n class, and scale and the Evaluation accuracy of foundation electrical network to be assessed, electrical network is refined as m grid, then this electrical network is total
n m Plant possible climate state, and the geographic area at each grid place the probability of a certain meteorological condition appears from statistics or from the acquisition of local meteorological department;
(d) every in electrical network circuit is numbered, suppose to amount in the described electrical network R bar circuit, then to the i bar circuit in the electrical network, have: 1≤i≤R, and i is natural number, the i initial value is 1, and to the construction criteria parameter K _ cs[i of i bar circuit] assignment is numerical value corresponding to described conventional construction criteria;
(e) suppose to comprise j meteorological condition in the zone of i bar line crossing, 1≤j≤n is obviously arranged, and j is natural number, be the j section with this i bar circuit equivalence then, and this i bar circuit amounts to by j different two-terminal element series connection, wherein j two-terminal element of i bar circuit is by failure rate λ [i] [j], repair rate μ [i] [j] and this two-terminal element equivalence degree of unavailability s[i] [j] description, and the element λ [i] [j] among two-dimensional array λ and the μ and μ [i] [j] all are meteorological condition K_w[i of i bar circuit j section] [j] and i bar line construction standard K _ cs[i] function, element s[i among the two-dimensional array s] [j] be the function of λ [i] [j] and μ [i] [j], and be specific as follows:
Wherein, K_w[i] [j] determined by the probability of meteorological condition in the i bar circuit j section institute grid coverage scope,
l[i] [j] expression j section accounts for the percentage of this i bar circuit overall length; The equivalent degree of unavailability ss[i of i bar circuit] equal s[i] [1], s[i] [2] ..., s[i] and [j] sum; Then, i is accumulated once;
(f) circulation execution in step (e), until i=R, thereby obtain ss[1], ss[2] ..., ss[R] and amount to the equivalent degree of unavailability of R bar circuit; Because ss[1], ss[2] ..., ss[R] and self is all less than 1, so extract in [0,1]
RIndividual random number t[k], wherein 1≤i≤R, and k is natural number, the k initial value is 1, from k=1 to k=R, compares one by one ss[k] and t[k]: as ss[k] 〉=t[k] time, then judge line fault, faulty line is excised; Otherwise circuit is normal, thereby obtains at random a definite system of described electrical network;
(g) for described system, carry out trend and calculate, the reliability index of statistics whole system and each node; And k accumulated once;
(h) circulation execution in step (e), (f), (g) are until k=
NThereby, statistics whole system and the final reliability index of each node;
(i) with the height ordering of all nodes according to reliability index, it is minimum to select reliability
ZAt node, the circuit that is attached thereto is defined as the lifeline circuit to individual node, wherein as the lifeline substation
ZValue with reference to the actual construction requirements of electrical network, for described lifeline transformer station and described lifeline circuit, implement electrical network lifeline construction criteria.
For above-described embodiment, it has been introduced meteorological condition and construction criteria among the appraisal procedure about lifeline, and this point is easy to understand from above-mentioned formula (1) to (3).That is to say that this embodiment has considered meteorological condition and construction criteria difference to the impact of electric network reliability, more be conducive to determine lifeline circuit and lifeline transformer station, thereby be conducive to further implement electrical network lifeline construction criteria.Lifeline transformer station and lifeline circuit are implemented electrical network lifeline construction criteria, mean lifeline circuit and lifeline transformer station have been carried out consolidation process, this must be from the part and greatly improves on the whole the reliability of electrical network, is convenient to electrical network and tackles various extreme meteorological conditions in the later stage.
With regard to the concrete steps of above-described embodiment, its step (a) can be interpreted as the initialization section of appraisal procedure to (d), step (e) to (f) is interpreted as the core of the method, step (g) to (i) is interpreted as the post-processed part of the method.Wherein, core technology thinking of the present invention has been embodied in initialization section and core, the post-processed part then belongs to the utilization to prior art, because calculate to obtain reliability index by trend a lot of implementations of the prior art are arranged, this point does not belong to innovation of the present invention place, so it will not go into details herein.
With regard to the N of above-described embodiment, it has reflected the precision of assessment, and N is larger, and precision is higher.Therefore, in the specific implementation, N also can possess extra implication, can represent the emulation time limit such as N: represent 1 year if suppose trend of every calculating (k increase by 1), then the N N that represented emulation.
With regard to this concept of reliability index, in the prior art, its can but be not limited to comprise: the expectation of power failure probability, power shortage, and expected energy not supplied.
With regard to the power failure probability, suppose certain the assessment after: for certain node p, if emulation N time, N1 time p node failure has appearred, then finish node p power failure probability is N1/N; For certain system that determines, if emulation N time, have N2 electrical network that one and Above Transmission Lines fault are arranged, then the system blackout probability is: N2/N.
With regard to power shortage expectation, suppose after certain is assessed: every emulation once, if line fault is arranged, and the total output power of electrical network can reduce Δ s after the troubleshooting; If fault-free, then total output power is constant.So, the power Σ Δ s that altogether loses of N emulation then is final power shortage expectation.
With regard to expected energy not supplied, suppose after certain assessment: every emulation once, if line fault is arranged, and total output power can reduce Δ s after the troubleshooting, in a single day fault correction time t determines so, then can calculate this time fault grid loss powering quantity value Δ Q; If fault-free, then Δ Q is 0.So, the powering quantity Σ Δ Q that altogether loses of N emulation is final expected energy not supplied.
In addition, preferred, in another embodiment: according to described lifeline construction criteria, upgrade the corresponding construction criteria K_cs value of described lifeline circuit, redefine failure rate, repair rate and the circuit equivalence degree of unavailability of lifeline circuit by above-mentioned formula (1), (2), (3), to substitute the original line parameter circuit value of this circuit; And then again from k=1, carry out above-mentioned steps (e), (f), (g), (h), thereby obtain the new reliability index of whole system and each node under the construction criteria of lifeline.
With regard to above-described embodiment, its purpose is to obtain: under the constant prerequisite of the construction criteria of all the other circuits except the lifeline circuit in the electrical network, after upgrading the corresponding construction criteria K_cs value of lifeline circuit, the new reliability index of whole system and each node.Be not difficult to find out, this embodiment is for the ease of the reliability index under the conventional construction criteria of new reliability index and original default is compared, thereby relatively: the reliability index of whole system and each node and the reliability index of whole system and each node when lifeline is arranged during without lifeline.If the later stage wishes further to contrast the situation under other construction criterias, with safety and the reliability of better guarantee electrical network, so also can be in other embodiments with result store and the output assessed at every turn.
In sum, the present invention can realize the Efficient Evaluation of electrical network lifeline take meteorological condition and construction criteria as starting point.In addition, the comparative analysis that the present invention can also be when having or not lifeline, with the enforcement of the quantitative response lifeline engineering improvement effect to existing electric network reliability.
Used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment only is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for those skilled in the art, according to thought of the present invention, all will change in specific embodiments and applications.In sum, this description should not be construed as limitation of the present invention.
Claims (2)
1. the appraisal procedure of an electrical network lifeline is characterized in that, described method comprises the steps:
(a) according to the network topology structure of described electrical network, the construction criteria parameter of the line parameter circuit value of each branch road and each node parameter and every circuit in the initialization electrical network, and be conventional construction criteria with the construction criteria parameter initialization of every circuit in the electrical network;
(b) the initial sample number of times is set
k=1 and total frequency in sampling
k=N, wherein: described total frequency in sampling N decides on Evaluation accuracy, and required precision is higher, and the N value is larger;
(c) according to the complexity of electrical network place geographical conditions, meteorological condition is divided into the n class, and scale and the Evaluation accuracy of foundation electrical network to be assessed, electrical network is refined as m grid, then this electrical network is total
n m Plant possible climate state, and the geographic area at each grid place the probability of a certain meteorological condition appears from statistics or from the acquisition of local meteorological department;
(d) every in electrical network circuit is numbered, supposes to amount to R bar circuit in the described electrical network, then to the i bar circuit in the electrical network, have: 1≤i≤R, and i is natural number, and the i initial value is 1, and to the construction criteria K_cs[i of every circuit] assignment is numerical value corresponding to described conventional construction criteria;
(e) suppose to comprise j meteorological condition in the zone of i bar line crossing, 1≤j≤n is obviously arranged, and j is natural number, be the j section with this i bar circuit equivalence then, and this i bar circuit amounts to by j different two-terminal element series connection, wherein j two-terminal element of i bar circuit is by failure rate λ [i] [j], repair rate μ [i] [j] and this two-terminal element equivalence degree of unavailability s[i] [j] description, and the element λ [i] [j] among two-dimensional array λ and the μ and μ [i] [j] all are meteorological condition K_w[i of i bar circuit j section] [j] and i bar line construction standard K _ cs[i] function, element s[i among the two-dimensional array s] [j] be the function of λ [i] [j] and μ [i] [j], and be specific as follows:
（3），
Wherein, K_w[i] [j] determined by the probability of meteorological condition in the i bar circuit j section institute grid coverage scope,
l[i] [j] expression j section accounts for the percentage of this i bar circuit overall length; The equivalent degree of unavailability ss[i of i bar circuit] equal s[i] [1], s[i] [2] ..., s[i] and [j] sum; Then, i is accumulated once;
(f) circulation execution in step (e), until i=R, thereby obtain ss[1], ss[2] ..., ss[R] and amount to the equivalent degree of unavailability of R bar circuit; Because ss[1], ss[2] ..., ss[R] and self is all less than 1, so extract in [0,1]
RIndividual random number t[k], wherein 1≤i≤R, and k is natural number, the k initial value is 1, from k=1 to k=R, compares one by one ss[k] and t[k]: as ss[k] 〉=t[k] time, then judge line fault, faulty line is excised; Otherwise circuit is normal, thereby obtains at random a definite system of described electrical network;
(g) for described system, carry out trend and calculate, the reliability index of statistics whole system and each node; And k accumulated once;
(h) circulation execution in step (e), (f), (g) are until k=
NThereby, statistics whole system and the final reliability index of each node;
(i) with the height ordering of all nodes according to reliability index, it is minimum to select reliability
ZAt node, the circuit that is attached thereto is defined as the lifeline circuit to individual node, wherein as the lifeline substation
ZValue with reference to the actual construction requirements of electrical network, for described lifeline transformer station and lifeline circuit, implement electrical network lifeline construction criteria.
2. system according to claim 1, it is characterized in that: according to described lifeline construction criteria, upgrade the corresponding construction criteria parameter K of described lifeline circuit _ cs value, redefine failure rate, repair rate and the circuit equivalence degree of unavailability of lifeline circuit by above-mentioned formula (1), (2), (3), to substitute the original line parameter circuit value of this circuit; And then again from k=1, carry out above-mentioned steps (e), (f), (g), (h), thereby obtain under the construction criteria of lifeline the new reliability index of whole system and each node.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151777A (en) * | 2013-03-27 | 2013-06-12 | 国家电网公司 | Power grid differentiation-based core backbone network architecture construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000270477A (en) * | 1999-03-17 | 2000-09-29 | Fuji Electric Co Ltd | Parallel processing method in assumed accident analysis of electric power system |
| CN102013085A (en) * | 2010-12-14 | 2011-04-13 | 天津市电力公司 | Evaluation method for distribution network reliability |
| CN102437654A (en) * | 2011-12-31 | 2012-05-02 | 国电南京自动化股份有限公司 | Station control realizing method based on monitoring system |
| CN202475017U (en) * | 2011-12-27 | 2012-10-03 | 许继集团有限公司 | System integrated with regulation and control based on networked protection |
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- 2012-11-12 CN CN201210449836.0A patent/CN102983567B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000270477A (en) * | 1999-03-17 | 2000-09-29 | Fuji Electric Co Ltd | Parallel processing method in assumed accident analysis of electric power system |
| CN102013085A (en) * | 2010-12-14 | 2011-04-13 | 天津市电力公司 | Evaluation method for distribution network reliability |
| CN202475017U (en) * | 2011-12-27 | 2012-10-03 | 许继集团有限公司 | System integrated with regulation and control based on networked protection |
| CN102437654A (en) * | 2011-12-31 | 2012-05-02 | 国电南京自动化股份有限公司 | Station control realizing method based on monitoring system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151777A (en) * | 2013-03-27 | 2013-06-12 | 国家电网公司 | Power grid differentiation-based core backbone network architecture construction method |
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Granted publication date: 20141126 Termination date: 20191112 |