CN103353924A - Power-grid-based evaluation method for safety and stability of time sequence construction - Google Patents

Power-grid-based evaluation method for safety and stability of time sequence construction Download PDF

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CN103353924A
CN103353924A CN2013102684190A CN201310268419A CN103353924A CN 103353924 A CN103353924 A CN 103353924A CN 2013102684190 A CN2013102684190 A CN 2013102684190A CN 201310268419 A CN201310268419 A CN 201310268419A CN 103353924 A CN103353924 A CN 103353924A
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stability
construction
sequential
scheme
time sequence
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CN103353924B (en
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刘开俊
赵庆波
张琳
李晖
罗毅
娄素华
吴耀武
施念
易海琼
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Huazhong University of Science and Technology
State Grid Corp of China SGCC
State Grid Economic and Technological Research Institute
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Huazhong University of Science and Technology
State Grid Corp of China SGCC
State Grid Economic and Technological Research Institute
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications

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Abstract

The invention discloses a power-grid-based evaluation method for safety and stability of time sequence construction. The method comprises the steps as follows: acquiring original data of any one time sequence construction scheme, and confirming and planning a power grid space truss structure corresponding to each middle construction year in level years according to construction time sequence and the original data in the time sequence construction scheme; computing a stability margin of each power grid space truss structure system in the time sequence construction scheme; computing a stable expectation value in the time sequence construction scheme according to the stability margins; and repeating the prior steps to obtain the stable expectation values of a plurality of time sequence construction schemes, comparing the plurality of stable expectation values, and taking one time sequence construction scheme corresponding to the maximum stable expectation value as the time sequence construction scheme with best safety and stability. According to the power-grid-based evaluation method for safety and stability of time sequence construction, the stability of the power grid in initial years, middle construction years and objective years during large power grid time sequence construction is considered, the minimum stable expectation value is adopted as the stability evaluation index of the time sequence construction scheme, and a risk to the whole stability of the scheme due to the fact that a construction stage with poorer stability exists is prevented.

Description

A kind of appraisal procedure of building safety and stability based on the sequential of electrical network
Technical field
The invention belongs to the Power System Planning field, more specifically, relate to a kind of appraisal procedure of building safety and stability based on the sequential of electrical network.
Background technology
In the electric system Electric Power Network Planning, the safety factor of power grid construction is the importance that Electric Power Network Planning is considered.Electric Power Network Planning generally is divided into static programming and multistage dynamic programming, and the former only seeks the optimum network of planning latter stage, and latter requires to provide the comprehensive assessment strategy in each stage.Because the construction period that the electrical network multistage builds is longer, need to make evaluation to the general safety stability of sequential construction scheme, therefore must carry out comprehensive general safety stability assessment to the power grid construction sequence problem.
At present, the less consideration safety and stability factor of assessment in the Power System Planning, existing Electric Power Network Planning considers that the safety and stability factor is mainly by following several modes:
(1) by the assessment result of power network planning scheme being carried out the rear verification of safety and stability: electrical network as shown in Figure 1, existing power grid construction program results is carried out the verification of N-1 static security, the verification of so-called N-1 static security refers to owing to network reality when Electric Power Network Planning must satisfy certain safe operation requirement, after namely cut-offfing arbitrarily a circuit in whole N bar circuits, whether every operating index of system still can satisfy the verification of given requirement.The method namely selects any element to cut-off under representational Run-time scenario to initial rack and the target rack of programme, arbitrary independent component in the element of the N in the electrical network (generator, transmission line of electricity, transformer etc.) breaks down and after cut, should not cause because of All other routes overload tripping operation to cause the user to have a power failure; Do not destroy Systems balanth, the accidents such as collapse of voltage do not occur.The static security stability of electrical network is just considered in this rear verification in planning in planning, the transient stability of taking into account system not, and when system is subject to large disturbance, the system of the construction scheme of planning will face the unstability risk.
(2) existing stabilization of power grids appraisal procedure mainly is that a plurality of stages of operation of power networks are carried out independent verification, can't carry out comprehensive evaluation to the multistage of operation of power networks.
(3) utilize the means of the cost conduct of electrical network required stabilizing measures of taking under disturbance quantitatively being weighed security and stability, the electricity net safety stable factor is converted into the safety cost factor stability of Electric Power Network Planning is estimated.Because electrical network needs to take the steady control means such as unit shut algorithm keeping the Systems balanth operation after the accident that occurs, thereby reaches the security and stability of quantitative test Electric Power Network Planning by the costs of weighing different steady control means.Thereby employing reaches the safety and stability evaluation method of the security and stability of quantitative test Electric Power Network Planning by the cost of weighing different steady control means, because determining system stability control measure cost is to adopt economic index that the stability of construction scheme is estimated, and drawing-in system to stablize the control measure cost be the prerequisite that adopts economic index that the stability of construction scheme is estimated, system stability control measure cost choose the objectivity that can affect the Stability Assessment result; In addition, the stability that directly adopts the safety cost index to assess the sequential construction scheme for the Operation of Electric Systems personnel is the indirect assessment to sequential construction scheme stability, although like this can the quantitative response Systems balanth for the planning personnel of electric system to the indirect assessment of stability, but but can not reflect intuitively the Systems balanth characteristic for this indirect assessment of the operations staff of electric system, when this is unfavorable for abnormality occurring in system for the Operation of Electric Systems personnel to the control of system.
(4) in traditional Electric Power Network Planning, build the safety evaluation problem of the construction scheme of sequential for difference, only considered the security and stability in initial year of construction scheme and target year, according to a kind of like this appraisal procedure a plurality of sequential construction schemes are assessed, can obtain the security and stability index of each sequential construction scheme, the optimum timing construction scheme that obtains according to assessment result was only taken into account initial year and the security and stability in target year, build period when the Net Frame of Electric Network in the construction scheme at certain and have lowlyer when stable, this stage that has than lower security stability can make whole sequential construction scheme face the unstability risk.
Summary of the invention
Above defective or Improvement requirement for prior art, the invention provides a kind of appraisal procedure of building safety and stability based on the sequential of electrical network, its purpose be to consider in the construction scheme of large electrical network sequential initial year, middlely build year, target year electrical network security and stability, solve thus that prior art was only considered initial year and the security and stability in target year can make whole sequential construction scheme face the technical matters of unstability risk.
For achieving the above object, according to one aspect of the present invention, provide a kind of sequential based on electrical network to build the appraisal procedure of safety and stability, comprised the steps:
S1: obtain the raw data in any one sequential construction scheme, determine that according to the construction sequential in the described sequential construction scheme and described raw data planning level builds year corresponding Power grid structure in the middle of each in year;
S2: calculate each Power grid structure Systems balanth nargin in the described sequential construction scheme:
S3: calculate stabilize desirable value in the described sequential construction scheme according to stability margin:
S4: repeating step S1 to S3 obtains the stabilize desirable value in a plurality of sequential construction schemes, and a plurality of stabilize desirable values are compared, and the maximum corresponding sequential construction scheme of stabilize desirable value is the best sequential construction scheme of security and stability.
Further, described step S2 is specially: in Power grid structure, select at random the position of fault, fault type and fault clearing time, and according to formula Δ S Ijkl=V Cr-V ClSystems balanth nargin after the calculating fault; V CrThe ceiling capacity that keeps the transient stability absorption for system after the fault; V ClThe gross energy that etching system obtains during for failure removal.
Further, described step S3 is specially:
S31: the probability that obtains the influence factor of system failure generation;
S32: the probability that obtains the system failure mute time;
S33: according to stability margin and above-mentioned probability and in conjunction with formula Γ ( S ) = Σ i = 1 n i Σ j = 1 n j Σ k = 1 n k Σ l = 1 n l [ P ( A i ) P ( B j ) P ( C k ) P ( D l ) Δ S ijkl ] Obtain the stabilize desirable value of the correspondence of planning level year in the sequential construction scheme;
S34: the stabilize desirable value that each time is corresponding compares, and gets minimum stabilize desirable value as the stabilize desirable value in the described sequential construction scheme;
Wherein, Γ (S) is stable expectation value, n iExpression circuit sum, n jDiscrete trouble spot sum on the expression circuit, n kExpression fault type sum, n lExpression fault clearing time sum, A iBe illustrated in i bar line failure, P(A i) be the probability of this line failure; B iFor breaking down P(B at j place, the position of circuit i j) be the probability that breaks down in this position; C kThe expression fault type is k, P(C k) corresponding probability when occuring for this fault type; D lThe expression fault clearing time is l, P(D L) probability when being l for this fault clearing time; Δ S IjklSystem stability nargin when being l for k type fault and fault clearing time occur when j place, the position of i circuit.
The present invention has considered initial year in the large electrical network sequential construction, the middle construction year, target year electrical network stability, adopt minimum stabilize desirable value as the Stability Assessment index of sequential construction scheme, the whole synthesis maintenance level that can comprehensively comprehensively reflect the sequential construction scheme, solved initial year, the middle construction year, target year, rack stability was to the evaluation problem of whole sequential construction scheme security implication, the inventive method has been calculated initial year in the scheme, the middle construction year, target year electrical network security and stability, consider the security and stability of large electrical network sequential construction scheme integral body, owing to the relatively poor construction period of existence and stability the resistance to overturning of scheme has been brought risk in the as a result scheme of having avoided optimizing.
Description of drawings
Fig. 1 uses the electrical network exemplary plot, and wherein the roundlet of the filling of the black on the power distribution network represents bus nodes; The roundlet of white filling symbol G represents the generator node;
What Fig. 2 embodiment of the invention provided builds the appraisal procedure realization flow figure of safety and stability based on the sequential of electrical network.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.In addition, below in each embodiment of described the present invention involved technical characterictic just can mutually not make up as long as consist of each other conflict.
The present invention is directed to the at present deficiency of assessment power grid construction sequential safety and stability in Electric Power Network Planning, provide a kind of appraisal procedure of calculating the minimum stabilize desirable value of electrical network sequential construction scheme to assess the security and stability of power grid construction sequential.The appraisal procedure that the sequential based on electrical network that the embodiment of the invention provides is built safety and stability is the safety and stability evaluation method of the electrical network sequential construction scheme in a kind of a plurality of stages, under the precondition that the speedup of each stage network load is identical in process of construction, thereby by the degree of stability of assessment electrical network in definite each scheme of resistance to overturning of lower corresponding each construction scheme of difference construction sequential.Considered that many scenes factor is (such as the fault type, the position of fault etc.) on the impact of the security and stability of power grid construction sequential, by to the asking for of the minimum stabilize desirable value of each each scene of scheme, the present invention can also carry out qualitative assessment to the security and stability of electrical network sequential construction scheme integral body simultaneously.
As shown in Figure 2, the Stability Assessment algorithm of building i kind sequential construction scheme in the appraisal procedure of safety and stability based on the sequential of electrical network that provides of the embodiment of the invention has following steps:
(1) obtains in the construction scheme of i kind sequential raw data (such as the genset data, the bus data, track data), determine that according to the construction sequential in the construction scheme of i kind sequential and described raw data planning level builds year corresponding Power grid structure in the middle of each in year;
(2) calculate each Power grid structure Systems balanth nargin in the construction scheme of i kind sequential:
In Power grid structure, select at random the position of fault, fault type and fault clearing time, and according to formula Δ S Ijkl=V Cr-V ClSystems balanth nargin after the calculating fault, in the formula, V CrBe transition energy, be the ceiling capacity that system keeps transient stability to absorb after the fault; V ClThe gross energy that etching system obtains during for failure removal;
Difference between the gross energy of the maximal value that Systems balanth nargin refers to keep after system failure stable absorption energy etching system acquisition during with failure removal;
(3) calculate stabilize desirable value in the construction scheme of i kind sequential according to stability margin;
Specifically comprise: the probability that obtains the influence factor of system failure generation; Obtain the probability of system failure mute time; According to stability margin, above-mentioned probability and in conjunction with formula Γ ( S ) = Σ i = 1 n i Σ j = 1 n j Σ k = 1 n k Σ l = 1 n l [ P ( A i ) P ( B j ) P ( C k ) P ( D l ) Δ S ijkl ] Obtain the stabilize desirable value of the correspondence of planning level year in the sequential construction scheme; The stabilize desirable value that each time is corresponding compares, and gets minimum stabilize desirable value as the stabilize desirable value in the described sequential construction scheme;
(4) repeating step (1) to (3) obtains the stabilize desirable value in a plurality of sequential construction schemes, and a plurality of stabilize desirable values are compared, the maximum corresponding sequential construction scheme of stabilize desirable value is the best sequential construction plan scheme of security and stability, is the inventive method safety and stability evaluation result to be determined.
In embodiments of the present invention, in Electric Power Network Planning, adopt the appraisal procedure of the minimum stabilize desirable value of calculating the construction scheme of electrical network sequential to assess large power grid construction sequential security and stability, the comprehensive security and stability of weighing in the whole sequential programme of electrical network.For a power grid construction scheme, calculate first it initial year, middle stabilization of power grids expectation value of building year, target year, then get initial year, middlely build year, the minimum value of stabilize desirable value under each scene in the target year electrical network, as the assessed value of large power grid construction sequential security and stability.The stability of sequential construction scheme is decided by the construction period of stabilize desirable value minimum in the scheme, weighs the sequential construction scheme by the stabilize desirable value of minimum construction period of stabilize desirable value in the scheme.For initial year, middlely build year, target stabilization of power grids expectation value under a certain definite scene in year, according to formula Γ ( S ) = Σ i = 1 n i Σ j = 1 n j Σ k = 1 n k Σ l = 1 n l [ P ( A i ) P ( B j ) P ( C k ) P ( D l ) Δ S ijkl ] Calculate the stabilize desirable value under this rack of this scene.In the formula, Γ (S) is the stabilize desirable value, n iCircuit sum in the expression system, n jDiscrete trouble spot sum on the expression circuit, n kExpression fault type sum, n lExpression fault clearing time sum, A iBe illustrated in i bar line failure, P(A i) be the probability of this line failure; B jFor breaking down P(B at j place, the position of circuit i j) be the probability that breaks down in this position; C kThe expression fault type is k, P(C k) corresponding probability when occuring for this fault type; D lThe expression fault clearing time is l, P(D l) probability when being l for this fault clearing time; Above probability all adopts the method for conventional Monte Carlo simulation to ask for respectively.Δ S IjklBe the system stability nargin of system in a certain definite scene, the system stability nargin of i.e. expression when j place, the position of i circuit generation k type fault and fault clearing time are l, Systems balanth nargin adopts existing direct method transient stability margin computing method calculating after the fault.
Elder generation in conjunction with the ultimate principle that Fig. 1 describes the stability assessment method of the large electrical network sequential of the present invention construction scheme in detail is:
(1) for the globality of large power grid construction sequential Stability Assessment, should guarantee building Systems balanth in each construction period.Large power grid construction sequential includes a plurality of construction periods, its assessment will realize the total evaluation for construction scheme, total evaluation then requires to guarantee should not occur the construction period of less stable in whole sequential process of construction, in the sequential process of construction of large electrical network since system loading growth level and rack construction to the combined influence of system stability so that the variation of each stage system stability in the sequential process of construction, in different construction sequential, security of system stability is subjected to the impact of grid structure variation and load growth and changes, in a kind of sequential construction scheme, comprise a plurality of construction periods, present Electric Power Network Planning is carried out the verification of N-1 static security to the construction rack in each stage, so-called N-1 refers to owing to network reality when Electric Power Network Planning must satisfy certain safe operation requirement, after namely in whole N bar circuits, cut-offfing arbitrarily a circuit, every operating index of system still can satisfy given requirement, the security of each Net Frame of Electric Network that can build qualitative definite multistage, and can't quantitatively determine the security and stability of a plurality of stage Net Frame of Electric Networks, and the transient safe and stable of programme is not considered in existing planning.The inventive method is calculated the stabilize desirable value in each stage in the sequential construction scheme, the stability of sequential construction scheme is decided by the construction period of stabilize desirable value minimum in the scheme, stabilize desirable value by the minimum construction period of stabilize desirable value in the scheme is weighed the sequential construction scheme, so the inventive method is set up.
(2) in the scheme for the judgement of stability algorithm of single stage electrical network, if circuit yet to be built is " circuit 6-9, circuit 12-14, circuit 10-21, circuit 6-28 ", adopt heuritic approach, the first step, consideration is on the basis of initial rack, calculate the stability margin of building each bar circuit in the phase one according to the stability margin formula, select the build circuit of the circuit of stability margin maximum as the phase one; Second step is built up in the phase one on the basis of rack, considers remaining three circuits yet to be built, calculates the stability margin of building each bar circuit in subordinate phase according to the stability margin formula, selects the circuit of stability margin maximum as the circuit of building of subordinate phase; The 3rd step, build up in subordinate phase on the basis of rack, consider remaining two circuits yet to be built, calculate the stability margin of building each bar circuit in the phase III according to the stability margin formula, the circuit of selection stability margin maximum is as the circuit of building of phase III, until finish the line construction in all stages.Because the Stability Assessment based on heuristic all is to replace global optimum by local optimum, so easily make final result of calculation be absorbed in local optimum.Therefore the inventive method is also set up.
In sum, as long as there is the multistage Construction Problems of electrical network, just need to consider the impact of the large electrical network overall security of ordered pair when the multistage builds, adopt appraisal procedure described in the invention to carry out total evaluation to the stability of the sequential construction scheme of large electrical network.
Adopt the large electrical network sequential of this scheme to build stability assessment method, have these remarkable advantages and beneficial effect: (1) the inventive method is only considered on the basis of steady stability risk in original planning, consider the risk of the system's existing transient stability when suffering large disturbance in the sequential process of construction, stablized foundation for large electrical network sequential construction assessment provides more comprehensive security; (2) the inventive method is introduced grid stability comprehensive evaluation by the method for considering the scene probability with the scene of electrical network, makes large electrical network poetry anthology build the scene factor that Stability Assessment has been considered Operation of Electric Systems, makes assessment result more can reflect the operation of power networks situation; (3) the inventive method directly adopts stability indicator but not economic index is estimated the stability of construction scheme, other factor affecting of in economic index introducing process, bringing have been avoided, determine that system stability control measure cost is the prerequisite that adopts economic index that the stability of construction scheme is estimated, and drawing-in system is stablized the objectivity that the control measure cost can finally affect the Stability Assessment result; In addition, will be more direct for the stability that the Operation of Electric Systems personnel directly adopt stability indicator to assess the sequential construction scheme, thereby when more being conducive to the Operation of Electric Systems personnel and moving in system to effective control of power system stability.(4) this appraisal procedure has considered initial year in the large electrical network sequential construction, the middle construction year, target year electrical network stability, adopt minimum stabilize desirable value as the Stability Assessment index of sequential construction scheme, the whole synthesis maintenance level that can comprehensively comprehensively reflect the sequential construction scheme, solved initial year, the middle construction year, target year, rack stability was to the evaluation problem of whole sequential construction scheme security implication, the inventive method has been calculated initial year in the scheme, the middle construction year, target year electrical network security and stability, consider the security and stability of large electrical network sequential construction scheme integral body, owing to the relatively poor construction period of existence and stability the resistance to overturning of scheme has been brought risk in the as a result scheme of having avoided optimizing.
The concrete Optimized model of carrying out method of the present invention can be as the ingredient of electric system timing optimization model the timing optimization scheme result of electric system to be carried out safety evaluation, also can be to build the stability that safety assessment is assessed the sequential construction scheme as the sequential of electric system.The method of the Systems balanth nargin under the large electric network fault of existing calculating be according to comparison system under fault the system transient modelling characteristic quantity and the difference of the critical characteristic amount of system calculate.At present, a lot of documents have been set forth the method for computing system stability margin from different angles, comprising: transient energy function method, unstable equilibrium point method, Potential Energy Boundary Surface Method etc.
The present invention adopts these existing algorithms to judge the stability margin of electrical network under fault.According to Systems balanth nargin after the fault each time find the solution initial year, middlely build year, target year each rack the appraisal procedure of stability margin expectation be: above-mentioned initial year, middlely build year, target year each stabilization of power grids expectation value computing method, it is characterized in that: for initial year, middlely build year, target year each determine the stabilization of power grids expectation value under the scene, calculate the stabilize desirable value of this scene rack according to stabilize desirable value formula.
In the method for the present invention, the fault type of described fault is followed the fault type probability of happening that working group of IEEE electric system relay special commission provides.
Referring to shown in Figure 1, the present invention is applied to the power grid construction planning of power transmission network.The construction sequential of circuit is considered in the power grid construction planning of power transmission network, the whole process of construction of electrical network is divided into the different construction periods, following known conditions is arranged in the programme in the construction plan, the initial rack of construction scheme, the target rack of construction scheme, the sequential construction was comprised of a plurality of construction periods, the rack of each construction period is different, these racks comprise initial year, the middle construction year, target year rack, the sequential process of construction is by limited initial year, the middle construction year, target year, rack formed, the initial year that forms different construction schemes, the middle construction year, target year, rack was identical, different sequential construction schemes planning level year rack the construction order different, G represents the generator node among Fig. 1, and the initial point of black represents bus nodes, represents branch road in the electric system without the arrow solid line, there is the solid line of arrow to represent the load of electric system, the existing transmission line of solid line representative, dotted line represents transmission line yet to be built, the numeral node serial number; Take rack shown in Figure 1 as example, circuit yet to be built is " circuit 6-9, circuit 12-14, circuit 10-21, circuit 6-28 " in this rack.Consider after other constraints, the construction of each scheme sequentially is in the alternatives: " circuit 6-9, circuit 12-14, circuit 10-21, circuit 6-28 ", " circuit 12-14, circuit 6-9, circuit 10-21, circuit 6-28 ", " circuit 12-14, circuit 10-21, circuit 6-9, circuit 6-28 ", " circuit 6-9, circuit 10-21, circuit 12-14, circuit 6-28 ", the Net Frame of Electric Network that all solid lines form among Fig. 1 is initial rack, all dotted line circuits are circuit yet to be built, and the summation of solid line and dotted line has formed the target rack of construction scheme.
If at first according to sequential construction scheme " circuit 6-9, circuit 12-14, circuit 10-21, circuit 6-28 ", in the sequential construction scheme, fault is set, and according to Systems balanth nargin under each fault of calculation of fault, result of calculation obtains initial year, middle stabilize desirable of building year, target year of sequential construction scheme " circuit 6-9, circuit 12-14, circuit 10-21, circuit 6-28 ", and relatively the stabilize desirable of each year obtains the minimum stabilize desirable value of this scheme; According to sequential construction scheme " circuit 12-14, circuit 6-9, circuit 10-21, circuit 6-28 ", in the sequential construction scheme, fault is set, and according to Systems balanth nargin under each fault of calculation of fault, result of calculation obtains initial year, middle stabilize desirable of building year, target year of sequential construction scheme " circuit 12-14, circuit 6-9, circuit 10-21, circuit 6-28 ", and relatively the stabilize desirable of each year obtains the minimum stabilize desirable value of this scheme; According to establishing sequential scheme " circuit 12-14, circuit 10-21, circuit 6-9, circuit 6-28 ", in the sequential construction scheme, fault is set, and according to Systems balanth nargin under each fault of calculation of fault, result of calculation obtains initial year, middle stabilize desirable of building year, target year of sequential construction scheme " circuit 12-14, circuit 10-21, circuit 6-9, circuit 6-28 ", and relatively the stabilize desirable of each year obtains the minimum stabilize desirable value of this scheme; According to sequential construction scheme " circuit 6-9, circuit 10-21, circuit 12-14, circuit 6-28 ", in the sequential construction scheme, fault is set, and according to Systems balanth nargin under each fault of calculation of fault, result of calculation obtains initial year, middle stabilize desirable of building year, target year of sequential construction scheme " circuit 6-9, circuit 10-21, circuit 12-14, circuit 6-28 ", and relatively the stabilize desirable of each year obtains the minimum stabilize desirable value of this scheme; According to above calculation procedure, calculate the minimum stabilize desirable value of other sequential construction schemes, the minimum stabilize desirable value of each sequential construction scheme relatively can obtain the best sequential construction scheme of stability according to the maximal value of the minimum stabilize desirable value of each scheme.
Those skilled in the art will readily understand; the above only is preferred embodiment of the present invention; not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. the appraisal procedure based on the sequential construction safety and stability of electrical network is characterized in that, comprises the steps:
S1: obtain the raw data in any one sequential construction scheme, determine that according to the construction sequential in the described sequential construction scheme and described raw data planning level builds year corresponding Power grid structure in the middle of each in year;
S2: calculate each Power grid structure Systems balanth nargin in the described sequential construction scheme:
S3: calculate stabilize desirable value in the described sequential construction scheme according to stability margin:
S4: repeating step S1 to S3 obtains the stabilize desirable value in a plurality of sequential construction schemes, and a plurality of stabilize desirable values are compared, and the maximum corresponding sequential construction scheme of stabilize desirable value is the best sequential construction scheme of security and stability.
2. appraisal procedure as claimed in claim 1 is characterized in that, described step S2 is specially: in Power grid structure, select at random the position of fault, fault type and fault clearing time, and according to formula Δ S Ijkl=V Cr-V ClSystems balanth nargin after the calculating fault; V CrThe ceiling capacity that keeps the transient stability absorption for system after the fault; V ClThe gross energy that etching system obtains during for failure removal.
3. appraisal procedure as claimed in claim 1 or 2 is characterized in that, described step S3 is specially:
S31: the probability that obtains the influence factor of system failure generation;
S32: the probability that obtains the system failure mute time;
S33: according to stability margin and above-mentioned probability and in conjunction with formula Γ ( S ) = Σ i = 1 n i Σ j = 1 n j Σ k = 1 n k Σ l = 1 n l [ P ( A i ) P ( B j ) P ( C k ) P ( D l ) Δ S ijkl ] Obtain the stabilize desirable value of the correspondence of planning level year in the sequential construction scheme;
S34: the stabilize desirable value that each time is corresponding compares, and gets minimum stabilize desirable value as the stabilize desirable value in the described sequential construction scheme;
Wherein, Γ (S) is stable expectation value, n iExpression circuit sum, n jDiscrete trouble spot sum on the expression circuit, n kExpression fault type sum, n lExpression fault clearing time sum, A iBe illustrated in i bar line failure, P(A i) be the probability of this line failure; B jFor breaking down P(B at j place, the position of circuit i j) be the probability that breaks down in this position; C kThe expression fault type is k, P(C k) corresponding probability when occuring for this fault type; D lThe expression fault clearing time is l, P(D l) probability when being l for this fault clearing time; Δ S IjklSystem stability nargin when being l for k type fault and fault clearing time occur when j place, the position of i circuit.
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CN105046587A (en) * 2015-08-12 2015-11-11 中国电力科学研究院 Grid equipment sequential management and simulation analysis method
CN110188998A (en) * 2019-05-13 2019-08-30 湖北省电力勘测设计院有限公司 The appraisal procedure of the timing construction reliability of the Wind turbines and energy storage of power distribution network

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