CN105896534A - Fault state set screening method for power transmission system considering importance degree and association degree of line - Google Patents
Fault state set screening method for power transmission system considering importance degree and association degree of line Download PDFInfo
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- CN105896534A CN105896534A CN201610327966.5A CN201610327966A CN105896534A CN 105896534 A CN105896534 A CN 105896534A CN 201610327966 A CN201610327966 A CN 201610327966A CN 105896534 A CN105896534 A CN 105896534A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to a fault state screening method in the electric power technical field, and specifically to a fault state set screening method for a power transmission system considering importance degree and association degree of a line. The fault state set screening method comprises the following steps of step 1, determining the importance degree and the association degree of the line; step 2, determining the probability factor of the line; step 3, determining the importance degree factor of the line; step 4, determining the first-order fault set of the system; and step 5, determining the n-order fault set of the system. According to the fault state set screening method, the dual factors of the importance degree and the association degree of the line are taken into consideration, and the fault set which has bad influence on the reliability of the system is screened. The fault state set screening method is high in rate of convergence, short in calculation time, capable of more actually reflecting the reliability level of the system, and is a fault state set rapid screening method for the electric power system with a quite bright prospect.
Description
Technical field
The present invention relates to a kind of technical field of electric power malfunction collection screening technique, be specially meter and
The transmission system malfunction collection screening technique of circuit importance degree and the degree of association.
Background technology
Along with the continuous expansion of electrical network scale, number of elements is that geometrical progression quickly increases, electric power
The probability of system generation random fault improves therewith.And along with electrified development, electric power is
Through being related to the every aspect of national economy, if random event causes power system afunction to incite somebody to action
Huge economy and social loss can be brought.The real reliability level assessing power system,
And instruct Electric Power Network Planning and the key that scheduling is safeguards system reliability service on this basis.
Power system generally can be divided into electricity generation system, transmission system and distribution system, due to electrical network
In large scale, Generation System Reliability assessment, transmission of electricity therefore it is generally divided into when reliability assessment
Reliability evaluation, reliability evaluation etc..Reliability assessment generally comprises system
The selection of malfunction collection, fault effects analysis and reliability index calculate.Wherein nonserviceable
When collection selects, generally simplify calculating, be generally two state models by element equivalent, i.e. think
Element only work and 2 states of stopping transport, it is assumed that system includes n element, then there may be
2nPlant system running state, limited by calculating resource and the time of calculating, it is impossible to all
Malfunction be estimated.Accordingly, it would be desirable to algorithm reasonable in design screens system reliability
Affect big malfunction to be estimated, as used fault tuple to limit, block probability, fault
The technology such as classification are to reduce amount of calculation.But only consider during generic failure condition selecting that fault occurs
The probability impact on reliability, and in practical power systems, high-probability event not necessarily causes
Big impact, some low probability event the most likely can cause massive blackout, even causes and is
System collapse.Only consider that the probability of fault generation, to Power System Reliability Analysis, is likely to result in
Assessment result is the most optimistic.The ultra-high-tension power transmission line of such as power system, due to it in systems
Effect extremely important, usual electric power enterprise can improve its reliability by various measures, its
Outage rate is the most relatively low, if considering merely, probability of malfunction may be ignored such transmission line of electricity and cause
System fault condition, it is impossible in view of this partial fault consequence impact on system reliability.
Equally, if only considering event severity of consequence, it is possible to assessment result can be caused the saddest
See, especially as the development of supertension UHV transmission technology, remote high power transmission circuit
Once fault can cause huge unbalanced power, even causes system unstability, if the most only examining
Consider failure effect and take no account of event occur probability be scheduling tactical arrangement, can significantly drop again
The economy that low system is run.
For transmission system, owing to influence factor is more, and between circuit, there is complexity
How non-linear relation, count and the reliability of system is reasonably assessed more by the impact of circuit
Add difficulty, such as capacity of trunk, actual trend, topology location, trend component etc..And once
After system jam, owing to electric network composition changes, all circuits are in new electrical network
Significance level will be different from original electrical network, for the determination side of multiple failure in reliability assessment
Case also can produce impact, still uses the significance level of circuit in original electrical network to be ranked up determining line
The critical role on road, it will lose effect, and electrical network all recalculates circuit after changing every time
Significance level, can make again the calculating time oversize, strengthens the cost of reliability assessment, even makes
Obtain the program infeasible due to calculating resource constraint.In order to equalize power system economy and
Reliability, needs malfunction collection screening technique reasonable in design, to react the most really
The reliability level of power system.Therefore, must take into account during Transmission System Reliability Evaluations simultaneously
The probability that event occurs, and the status that circuit is in power system, comprehensively determine transmission system
Malfunction collection.
Summary of the invention
The present invention is to solve existing Model in Reliability Evaluation of Power Systems method Consideration single and
Cause the problem that assessment errors is big, it is provided that a kind of meter and circuit importance degree and the transmission of electricity of the degree of association
System fault condition collection screening technique.This method uses circuit importance degree to determine single order fault, root
Multistage fault is determined, to improve efficiency and the accuracy of reliability assessment according to the degree of association.
The present invention adopts the following technical scheme that realization: meter and circuit importance degree and the degree of association
Transmission system malfunction collection screening technique, comprise the following steps:
Step one: determine circuit importance degree and the degree of association:
(1) the absolute trend factor of circuit i is determinedI=1,2 ..., l,
The absolute trend of i.e. circuit i and the ratio of the transmission capacity upper limit of circuit i, wherein l is system
Circuit number, q is system unit number,For the absolute trend on circuit i, PimaxFor circuit i
The transmission capacity upper limit, PksThe active power sent for electromotor k,For electromotor branch road merit
Rate distribution factor, is i.e. sent by electromotor k and injects the active power of circuit i and account for electromotor k and send out
The ratio of the active power gone out；
(2) weight factor of circuit i is determinedG is and electromotor
Direct-connected line set, PiFor the actual effective power flow in circuit i.I.e. for common line, its
Weight factor is its line load rate；The direct-connected circuit of electromotor, its weight factor is line load
Rate and line transmission power account for the ratio sum of system generating total amount；
(3) the criticality factor of circuit i is determinedThe criticality factor of circuit is the biggest,
Illustrating that the circuit absolute trend factor is the biggest or circuit weight factor is the biggest, i.e. circuit is in systems
Importance is the highest；
(4) degree of association factor between circuit is determined
J=1,2 ..., l, and j ≠ i.Arbitrarily two lines road i, the biggest explanation of the degree of association factor between j
The two effect in terms of through-put power is closer to, once its simultaneous faults, the merit that it carries
Rate is likely to cannot transmit due to Transmission Capacity Constraints, causes system cutting load, and reduction can
By property；
Step 2: determine the probability factor θ of circuit ii=pdi/pui, wherein pdiFor stopping of circuit i
Fortune probability, puiOperation probability for circuit i；
Step 3: determine the importance factors of circuit iI.e. add with circuit probability factor
The circuit criticality factor of power, considers the circuit criticality factor and circuit probability factor, generally
After the line fault that rate is the biggest and the most important, the reliability effect to system is the biggest；
Step 4: determine system single order fault set: the single element fault of system is referred to as single order fault,
According to circuit importance factorsOrder from big to small, sets circuit i fault successively,
Single order malfunction as system；
Step 5: determine system n rank fault set: have the state of n element fault to claim in system
For n rank fault, 1 < n < l.On the basis of single order fault set, determine remaining circuit and fault
The degree of association factor of circuit, sorts remaining circuit by the degree of association factor, obtains second order fault set.
On the basis of second order fault set, determine the degree of association of remaining circuit and two faulty lines because of
Son, and select the degree of association fac-tor of the maximum of which degree of association factor and Second Order state circuit
As the degree of association factor of circuit of the state of this three rank fault, by malfunction according to the degree of association
The factor sorts, and obtains three rank fault set.The like, at the base of k (k > 2) rank fault set
On plinth, determine the degree of association factor of remaining circuit and k bar faulty line, and select wherein maximum
The degree of association fac-tor of the degree of association factor and kth rank status line as this k+1 rank fault
The degree of association factor of circuit of state, malfunction is sorted according to the degree of association factor, obtains
K+1 rank fault set.Use fast sorting technique, determine the n rank malfunction of system successively,
So that it is determined that the n rank fault set of system, finally give single order to n rank fault set.
This method meter and circuit criticality and the impact of circuit probability factor, it is proposed that circuit is important
The degree factor, by the sequence to circuit importance factors, determines the single order fault set of power system,
And on the basis of single order fault set, determine the n rank fault of system according to the circuit degree of association factor
State set.This fault set rapid screening method selects that system reliability is affected bigger state and enters
Row assessment, can more reasonably assess the reliability level of system, for Power System Planning and
Management and running provide feasible suggestion.
Detailed description of the invention
Meter and the transmission system malfunction collection screening technique of circuit importance degree and the degree of association, including
Following steps:
Step one: determine circuit importance degree and the degree of association:
(1) the absolute trend factor of circuit i is determinedI=1,2 ..., l,
Wherein l is system line way, and q is system unit number,For the absolute trend on circuit i, Pimax
For the transmission capacity upper limit of circuit i, PksThe active power sent for electromotor k,For generating
Machine branch power distribution factor.
(2) weight factor of circuit i is determinedG is and electromotor
Direct-connected line set, PiFor the actual effective power flow in circuit i.
(3) the criticality factor of circuit i is determined
(4) degree of association factor between circuit is determined
J=1,2 ..., l, and j ≠ i.
Step 2: determine the probability factor θ of circuit ii=pdi/pui, wherein pdiFor stopping of circuit i
Fortune probability, puiOperation probability for circuit i.
Step 3: determine the importance factors of circuit i
Step 4: according to circuit importance factorsOrder from big to small, sets successively
Circuit i fault, determines the single order malfunction collection of system.
Step 5: determine system n rank fault set: have the state of n element fault to claim in system
For n rank fault, 1 < n < l.On the basis of single order fault set, determine remaining circuit and fault
The degree of association factor of circuit, sorts remaining circuit by the degree of association factor, obtains second order fault set.
On the basis of second order fault set, determine the degree of association of remaining circuit and two faulty lines because of
Son, and select the degree of association fac-tor of the maximum of which degree of association factor and Second Order state circuit
As the degree of association factor of circuit of the state of this three rank fault, by malfunction according to the degree of association
The factor sorts, and obtains three rank fault set.Such as 2 rank faults comprise faulty line (1,2),
When then determining 3 rank fault, in the degree of association factor of selection circuit 3 and circuit 1 and circuit 2 relatively
Big person, then the degree of association factor of 3 rank faults (1,2,3) is
On the basis of k (k > 2) rank fault set, determine associating of remaining circuit and k bar faulty line
The degree factor, and select the degree of association of the maximum of which degree of association factor and kth rank status line because of
The degree of association factor of the circuit of the state that son is multiplied as this k+1 rank fault, presses malfunction
Sort according to the degree of association factor, obtain k+1 rank fault set.Use fast sorting technique, the most really
Determine the n rank malfunction of system, so that it is determined that the n rank fault set of system, finally give single order
To n rank fault set.
The meter of the present invention and the transmission system malfunction collection screening of circuit importance degree and the degree of association
Method, considers circuit effect in systems, and the probability of circuit reliability service, can
To take into account big probability not matters of aggravation and small probability serious consequence event, more comprehensively assess electricity
The reliability level of Force system, simultaneously fast convergence rate, calculate the time comparatively short, be have very much before
A kind of malfunction collection rapid screening method of the Model in Reliability Evaluation of Power Systems of scape.
Claims (1)
1. meter and the transmission system malfunction collection screening technique of circuit importance degree and the degree of association,
It is characterized in that comprising the following steps:
Step one: determine circuit importance degree and the degree of association:
(1) the absolute trend factor of circuit i is determinedI=1,2 ..., l,
Wherein l is system line way, and q is system unit number,For the absolute trend on circuit i, Pimax
For the transmission capacity upper limit of circuit i, PksThe active power sent for electromotor k,For generating
Machine branch power distribution factor；
(2) weight factor of circuit i is determinedG is and electromotor
Direct-connected line set, PiFor the actual effective power flow in circuit i；
(3) the criticality factor of circuit i is determined
(4) degree of association factor between circuit is determined
J=1,2 ..., l, and j ≠ i；
Step 2: determine the probability factor θ of circuit ii=pdi/pui: wherein pdiFor stopping of circuit i
Fortune probability, puiOperation probability for circuit i；
Step 3: determine the importance factors of circuit i
Step 4: according to circuit importance factorsOrder from big to small, sets successively
Circuit i fault, determines the single order malfunction collection of system；
Step 5: on the basis of single order fault set, determines the pass of remaining circuit and faulty line
The connection degree factor, sorts remaining circuit by the degree of association factor, uses and improves fast sorting technique,
Determine the n rank malfunction of system successively, determine the n rank fault set of system, 1 < n < l,
Obtain single order eventually to n rank fault set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610327966.5A CN105896534B (en) | 2016-05-17 | 2016-05-17 | Meter and the transmission system malfunction collection screening technique of circuit importance and the degree of association |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610327966.5A CN105896534B (en) | 2016-05-17 | 2016-05-17 | Meter and the transmission system malfunction collection screening technique of circuit importance and the degree of association |
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| CN105896534A true CN105896534A (en) | 2016-08-24 |
| CN105896534B CN105896534B (en) | 2018-04-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451441A (en) * | 2016-11-25 | 2017-02-22 | 国网浙江省电力公司电力科学研究院 | Method for screening N-k fault set of power system rapidly |
| CN107818414A (en) * | 2017-10-30 | 2018-03-20 | 国网山东省电力公司潍坊供电公司 | A kind of generation method of the extensive contingency sets of AC-DC hybrid power grid N 2 |
Citations (2)
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| JPH06339225A (en) * | 1993-05-28 | 1994-12-06 | Shimizu Corp | Power distribution system with self-diagnostic function |
| CN105574614A (en) * | 2015-12-15 | 2016-05-11 | 东北大学 | Electric power system line weakness evaluation system and method based on multi-attribute analysis |
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2016
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| JPH06339225A (en) * | 1993-05-28 | 1994-12-06 | Shimizu Corp | Power distribution system with self-diagnostic function |
| CN105574614A (en) * | 2015-12-15 | 2016-05-11 | 东北大学 | Electric power system line weakness evaluation system and method based on multi-attribute analysis |
Non-Patent Citations (1)
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| 何海丹等: "基于结构和概率重要度的系统关键线路辨识", 《电力建设》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451441A (en) * | 2016-11-25 | 2017-02-22 | 国网浙江省电力公司电力科学研究院 | Method for screening N-k fault set of power system rapidly |
| CN106451441B (en) * | 2016-11-25 | 2019-02-05 | 国网浙江省电力公司电力科学研究院 | A kind of rapid screening method of electric system N-k fault set |
| CN107818414A (en) * | 2017-10-30 | 2018-03-20 | 国网山东省电力公司潍坊供电公司 | A kind of generation method of the extensive contingency sets of AC-DC hybrid power grid N 2 |
| CN107818414B (en) * | 2017-10-30 | 2020-07-31 | 国网山东省电力公司潍坊供电公司 | Method for generating N-2 expected accident set of large-scale alternating current-direct current hybrid power grid |
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| CN105896534B (en) | 2018-04-24 |
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Inventor after: Jia Yanbing Inventor after: Liang Chen Inventor after: Han Xiaoqing Inventor after: He Haidan Inventor after: Wang Peng Inventor after: Wang Ying Inventor after: Liu Ruiqiong Inventor before: Jia Yanbing Inventor before: Han Xiaoqing Inventor before: He Haidan Inventor before: Wang Peng Inventor before: Wang Ying Inventor before: Liu Ruiqiong |
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