CN110071500B - Method and system for decision-making of power distribution line recovery sequence after bus fault power loss - Google Patents
Method and system for decision-making of power distribution line recovery sequence after bus fault power loss Download PDFInfo
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Abstract
The invention provides a method and a system for deciding a recovery sequence of a distribution line after a bus fault and power failure. And finally, determining the total sequence of each line for each evaluation index in the user evaluation classification model by using a sequence method, and obtaining a recovery sequence after the power failure of the distribution line. Based on the method, a power distribution line recovery sequence decision-making system is also provided. The invention ensures that important users can recover power transmission at the highest speed, establishes a hierarchical analysis model for determining the optimal recovery sequence of the distribution line, and integrates various factors such as social and economic losses caused by power loss of the distribution line into the hierarchical analysis model, thereby facilitating calculation and modeling. On the basis of the hierarchical model, the relative order and the total order are calculated by using a level preference order method, so that better operability is achieved.
Description
Technical Field
The invention relates to the technical field of power system transportation scheduling, and particularly provides a method and a system for determining a recovery sequence of a distribution line after a bus fault and power failure.
Background
For 220kV, 110kV and 35kV transformer substations with 20kV, 10kV or 6kV feeder lines running, the transformer substation power failure accident caused by the faults of the upper-level power supply or the main transformer and the bus in the substation can cause the 20kV, 10kV or 6kV feeder lines directly supplying power to users to be completely lost, and the power supply of the bus, the substation transformer and part of feeder line loads is recovered through the load transfer capacity between the transformer substations through the distribution interconnection lines of other transformer substations. On one hand, the load transfer capacity between the transformer substations is limited, and all power-loss loads cannot be recovered, and on the other hand, the operation with a complex recovery process needs a long time, and important users cannot be guaranteed to recover power transmission at the highest speed. In the recovery process, the condition that each feeder line supplies power to users needs to be comprehensively considered, and the emergency degree of power recovery of the distribution line and the post-accident recovery sequence are determined. According to the classification principle of power users, the power users are classified into three levels according to the loss degree of personal injury, politics, economy and the like caused by power supply interruption, but the definition of the classification of the power load in the related standard is over rationalization and can be used as a guide principle and a quantification standard to evaluate the important degree of the users and lines, and the operation difficulty is relatively high.
The Chinese patent [201610305304.8] proposes the division principle of important users; analyzing the configuration of an important user power supply structure in the jurisdiction range; on the basis of the traditional power grid accident handling emergency plan, important user fault handling and rapid power supply recovery plans are compiled. However, the method only aims at a few important users, the importance degree of the users carried by the users is not evaluated by taking the feeder line as a unit, and the emergency degree and the recovery sequence of the recovery power supply of the substation feeder line after power failure cannot be evaluated on the basis of the analysis of the important users.
Chinese patent [20161106707.0] provides a method for power restoration and switch operation sequence generation after bus voltage loss fault, a CSP model of a power distribution network is established, and an optimal solution meeting constraint conditions is searched by adopting a dynamic asynchronous backtracking algorithm, but only a target function of the method is still limited to physical conditions of minimum loss load, few switch operation times and the like, and the importance degree of a user is not considered.
The Chinese patent [201610305304.8] proposes the division principle of important users; analyzing the configuration of an important user power supply structure in the jurisdiction range; on the basis of the traditional power grid accident handling emergency plan, an important user fault handling and rapid power supply recovery plan is compiled. However, the method only aims at a few important users, the importance degree of the users carried by the users is not evaluated by taking the feeder line as a unit, and the emergency degree and the recovery sequence of the recovery power supply of the substation feeder line after power failure cannot be evaluated on the basis of the analysis of the important users.
Chinese patent [20161106707.0] provides a method for generating power supply recovery and switching operation sequence after bus voltage loss fault, a power distribution network CSP model is established, and an optimal solution meeting constraint conditions is searched by adopting a dynamic asynchronous backtracking algorithm, but only a target function of the method is still limited to physical conditions of minimum loss load, few switching operation times and the like, the importance degree of a user is not considered, and the recovery sequence of a power loss feeder line cannot be determined according to the importance degree of a user.
Disclosure of Invention
In view of the above disadvantages, the embodiments of the present invention provide a method and a system for determining a power distribution line restoration sequence after a bus fault and power loss, so as to evaluate the importance degree of a power distribution line with power loss for users, that is, the emergency degree of restoration power supply, and the restoration power supply sequence after an accident power failure, and improve the accuracy and the reasonability of accident handling of a power distribution network.
The invention provides a method for deciding a recovery sequence of a distribution line after a bus fault and power loss, which comprises the following steps:
and establishing a user evaluation classification model by taking the existence, the quantity and the importance degree of typical users supplied by each line as index factors for evaluating the emergency degree of fault recovery.
Establishing an optimal recovery sequence hierarchical classification model based on a user evaluation classification model, and determining the weight of each index factor; the optimal recovery sequence hierarchical classification model comprises a top layer, a middle layer and a bottom layer; the top layer is a target layer; the middle layer is a criterion layer; the bottom layer is a scheme layer;
and determining the total number of the lines for each evaluation index in the user evaluation classification model by using an optimization method to obtain a recovery sequence after the power failure of the distribution lines, wherein the optimization method expresses the importance degree of the load of one line corresponding to the other line by using grades for the same index through grade preference, and then establishes the index number to further determine the total number of the lines.
Further, the establishment method of the criterion layer is that the criterion layer is constructed by a scale methodEstablishing a criterion layer, representing the importance degree of different factors compared in pairs by adopting scale symbols, and determining the weight of each influencing factor by a judgment matrix; the determination matrix R = [ alpha = [ ] ij ] NxN (ii) a The alpha ij Is the ratio of the importance of factor i to factor j; and N is N evaluation factors of the to-be-tested layer.
Further, the diagonal element α of the determination matrix R is ij Is 1, and the main eigenvalue λ of the matrix R is judged max The corresponding characteristic direction is the quantity W = (W) 1 ,w 2 …w N ) T Then alpha ij ＝w i /w j ；
Said w i The influence degree of the ith element of the criterion layer on the target layer; said w j Is the degree of influence of the jth element of the criterion layer on the target layer.
Furthermore, the representation mode of the grade comprises a matrix for quantizing the named values and a constructed grade matrix; the expression mode of the matrix of the quantized named values is as follows:
max is stated j {f ij Each line has a name value f corresponding to j-th index ij Maximum value of (d); the min j {f ij Each line has a name value f corresponding to the jth index ij Minimum value of (d); said dj = max j {f ij }- min j {f ij }; and h is a series of grades.
Further, the expression manner of the rank matrix is as follows:
G＝[ɡ ij ] mxn (ii) a Said g is ij The grade of the jth evaluation index corresponding to the ith line is obtained; m is the number of lines to be recovered; and n is the index number corresponding to the number of the m lines to be recovered.
Further, the index number is expressed in the following manner:
b is ilj Is the dominance of the ith line relative to the ith line under the index j.
Further, in b ilj On the basis of the above-mentioned formula (I),
b is il The number of the comprehensive priority of the ith line relative to the ith line is set; said w j The weights of the indexes determined by the hierarchical analysis model.
Further, the total number of the priority K of the line i Emergency degree for restoring power transmission with respect to all other lines;
the above-mentioned
Said K min Is K i The medium minimum value.
A distribution line restoration sequence decision system after bus fault power loss comprises a classification model building module, a hierarchy model building module and a restoration sequence building module;
the classification model establishing module is used for establishing a user evaluation classification model by taking the existence, the quantity and the importance degree of typical users supplied by each line as index factors for evaluating the failure recovery emergency degree;
the hierarchical model establishing module is used for establishing an optimal recovery sequence hierarchical classification model based on a user evaluation classification model and determining the weight of each index factor;
and the recovery sequence establishing module is used for determining the total sequence number of each line for each evaluation index in the user evaluation classification model by using a sequence optimization method.
The effect provided in the summary of the invention is only the effect of the embodiment, not all the effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
the embodiment of the invention provides a method and a system for deciding a recovery sequence of a distribution line after a bus fault and power failure. And then, establishing an optimal recovery sequence hierarchical classification model based on the user evaluation classification model. And finally, determining the total number of the lines for each evaluation index in the user evaluation classification model by using a priority method to obtain a recovery sequence after the power failure of the distribution lines, wherein the priority method is to express the importance degree of the load of one line corresponding to the other line by using the grade through the grade preference for the same index, then establishing the index number, and further determining the total number of the lines. Based on the method for deciding the recovery sequence of the distribution line after the power failure of the bus, the invention also provides a system for deciding the recovery sequence of the distribution line after the power failure of the bus. The invention integrates the condition of the power supply and take users of the distribution line, calculates the emergency degree of the power restoration of the distribution line, determines the restoration sequence after the power failure of the distribution line and ensures that important users restore power transmission at the highest speed. A hierarchical analysis model for determining the optimal recovery sequence of the distribution line is established, and various factors such as social and economic losses caused by power failure of the distribution line are integrated into the hierarchical analysis model, so that calculation and modeling are facilitated. On the basis of the hierarchical model, the relative sequence number and the total sequence number of the power transmission restoration urgency degree of each power distribution line are calculated by using a level preference sequence method and are used as reference values of the power transmission restoration sequence of the power distribution lines, the difficulty that power failure loss of various users is difficult to quantify is avoided, the power transmission restoration urgency degree of the power distribution lines can be quantitatively expressed only by comparing the importance degrees of the users of the same type, and the operability is better.
Drawings
Fig. 1 is a flowchart of a method for deciding a recovery sequence of a distribution line after a bus fault and power loss in embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of a hierarchical classification model for establishing an optimal recovery sequence according to embodiment 1 of the present invention;
fig. 3 is a connection diagram of a power distribution line restoration sequence decision system after a power failure of a bus according to embodiment 1 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Example 1
The embodiment 1 of the invention provides a method for deciding a power distribution line recovery sequence after a bus fault loses power, which is characterized in that various factors such as social and economic losses caused by power distribution line power loss are integrated into a hierarchical analysis model, and the weight of each factor index is determined by utilizing a hierarchical analysis method; and (3) integrating the power supply user conditions of all the feeder lines, and determining the optimal recovery sequence of the line by using a grade preference optimization method so as to ensure that the most important power supply load is recovered accurately and quickly.
Fig. 1 is a flowchart of a method for determining a recovery sequence of a distribution line after a power failure of a bus according to embodiment 1 of the present invention.
In step S101, distribution line supply users are classified into N types according to the overall situation of the distribution line users, and users of different types of supply are used as evaluation factors to input a hierarchical model for determining an optimal line restoration sequence.
In step S102, the existence, the quantity and the importance degree of each line for carrying typical users are used as index factors for evaluating the emergency degree of fault recovery, and a user evaluation classification model is established;
in step S103, an optimal recovery sequence hierarchical classification model is established based on the user evaluation classification model, and the weight of each index factor is determined.
In step S104, determining the total number of the priority of each line for each evaluation index in the user evaluation classification model by using a priority method, and obtaining a recovery sequence after power failure of the distribution line, wherein the priority method represents the importance degree of one line corresponding to the load of another line by using a grade for the same index through grade preference.
In step S105, an index number is established, and a total number of the routes is determined.
Regarding the establishment of the user evaluation classification model, according to the relevant standard of the load importance degree, the evaluation mode of important users is the personal casualty and the political economic loss caused by the power interruption and the influence of the power interruption on the normal work of the power utilization unit with political and economic significance. The above criteria are still very abstract and there is a great difficulty in directly comparing and measuring the political losses and public impact of the relevant users. For a specific user, the emergency degree of power restoration can be compared, for example, it is difficult to specifically define how much each of "personal casualty" and "political loss" is after power failure in a certain important hospital, but for two hospitals after power failure at the same time, the power transmission restoration requirement of "hospital a" is more urgent than that of "hospital b" can be obtained through comparison. Therefore, political and economic losses caused by power supply interruption can be converted into a plurality of types of typical users, the existence, the number and the importance degree of the typical users carried by each line are used as index factors for evaluating the failure recovery emergency degree, and statistics and modeling can be performed more conveniently. N types of typical users can be selected as evaluation factors according to induction, and the typical users and the corresponding loss types after power failure are shown in the attached table 1. And 7 types of the users are listed, and other types of typical users can be added as evaluation factors according to the load structure of the power distribution network.
Based on the user evaluation classification model, an optimal recovery sequence hierarchical classification model is established, and the weight of each index factor is determined, for example, fig. 2 provides a schematic diagram for establishing the optimal recovery sequence hierarchical classification model based on embodiment 1 of the present invention. The optimal recovery sequence hierarchical classification model comprises a top layer, a middle layer and a bottom layer, wherein the top layer is a target layer and is a problem to be solved or a general target, namely the optimal recovery sequence of the power distribution line with power loss. The middle layer is a criterion layer and is a factor influencing the decision of the target layer, namely N evaluation factors in the attached table 1. The bottom layer is a scheme layer, which is an optional decision scheme, i.e. a recovery sequence for each line. For example, in order to comprehensively evaluate the influence degree of each influencing factor on the decision target, the optimal recovery sequence hierarchical classification model as shown in fig. 2 needs to assign a certain weight to each influencing factor, all the influencing factors are directly put together for comparison, and it is difficult to assign a weight to each influencing factor, so that the weight of each influencing factor is determined by building a criterion layer judgment matrix through a scaling method. The criterion for forming the judgment matrix in the optimal recovery sequence hierarchical classification model is established as shown in the attached table 2 below.
In the attached Table 2, the scale symbols represent the degree of importance between the different factors compared two by two. If the ratio of the importance of factor i to factor j is a ij The ratio of the importance of factor j to factor i is then a ji ＝1/a ij . For the setup as given in fig. 2N evaluation factors of the optimal recovery sequence hierarchical classification model are pairwise compared with the emergency degree of power transmission recovery after power failure, and a judgment matrix R is obtained:
R＝[a ij ] N×N
the judgment matrix R is constructed to satisfy the consistency, the consistency refers to the logical consistency of the judgment thinking, for example, when A is more important than C, and B is more important than C, A is more important than B obviously. This is to judge the logical consistency of thinking, otherwise, the judgment will be contradictory. Diagonal elements of the matrix R are all 1, if the main eigenvalue lambda of the matrix R is judged max The corresponding characteristic direction is the quantity W = (W) 1 ,w 2 …w N ) T Then, there are:
w is an element of W i The influence degree of the ith element of the criterion layer on the target layer is shown, and the main characteristic value lambda of the judgment matrix is obtained max Corresponding eigenvector W = (W) 1 ,w 2 …w N ) T Normalizing W to obtain the weight W of each factor corresponding to the decision target 1 ,w 2 …w N 。
And determining the total sequence number of each line for each evaluation index in the user evaluation classification model by using a sequence optimization method, and obtaining a recovery sequence after the power failure of the distribution line, wherein the sequence optimization method expresses the importance degree of the load of one line corresponding to the other line by using the grade for the same index through grade preference. In order to better distinguish the emergency degree of restoration of the distributed electric lines, grade preference is introduced on the basis of a basic sequence method, and the importance degree of the load of one line corresponding to the load of the other line is represented by grades for the same index. The line to be recovered is divided into h levels, and if the line to be recovered corresponds to the index j, a quantized named value f can be used j ＝[f 1 ， f 2 …f m ] T Indicating the number of users in high-rise residential districts, the economic loss of power failure of productive enterprises, etcThe named values are classified into h classes according to:
therein, max j {f ij For each line there is a named value f corresponding to the jth index ij Maximum value of (d); min(s) j {f ij Each line has a name value f corresponding to the jth index ij Minimum value of (d); dj = max j {f ij }-min j {f ij }; h is a number of levels.
If the corresponding indexes cannot be directly expressed by quantized famous values, such as the importance levels, the degree and the like of hospitals and transportation hubs, the indexes can be directly expressed by levels. If m lines to be recovered exist, corresponding to n indexes, constructing an index grade matrix G according to the grade division result of each index corresponding to each line
G＝[ɡij]mxn
Wherein, g ij The grade of the jth evaluation index corresponding to the ith line is set; m is the number of lines to be recovered; and n is the index number corresponding to the number of the m lines to be recovered.
Index number of priority b ilj The dominance of the ith line relative to the ith line under the index j. The index priority number after considering the grade division is
Number of indexes b in single line ilj In consideration of the weight w of each index 1 ,w 2 …w n The comprehensive number of the priority of the ith line relative to the ith line is defined as
Wherein, w j For the weight of each index determined by the hierarchical analysis model, N scores in Table 1 are attachedValence factor, then N = N. The ith line is summed relative to all other line sequence numbers to obtain the total sequence number K of the line i The emergency degree of the return power transmission of all other lines is expressed, and the larger the total number of the priority values is, the higher the emergency degree of the return power transmission is.
Wherein, K min Is K i The medium minimum value. Because the matrix R and the matrix G have consistency, the index order b of each line il And total number of orders K i Consistency should also be satisfied, i.e. if K i >K l Then b is il >b li And vice versa. Therefore, the sequence is the optimal line recovery sequence of the comprehensive multiple evaluation indexes according to the sequence from large to small of the total sequence.
The invention also provides a system for the decision of the recovery sequence of the distribution line after the power failure of the bus, which comprises a classification model building module, a hierarchy model building module and a recovery sequence building module;
the establishment classification model module is used for establishing a user evaluation classification model by taking the existence, the quantity and the importance degree of typical users supplied by each line as index factors for evaluating the failure recovery emergency degree;
the establishment hierarchical model module is used for establishing an optimal recovery sequence hierarchical classification model based on a user evaluation classification model and determining the weight of each index factor;
and the restoration sequence establishing module is used for determining the total sequence of each line for each evaluation index in the user evaluation classification model by using an optimization method to obtain a restoration sequence after the power failure of the distribution line.
While the invention has been described in detail in the specification and drawings and with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted; all technical solutions and modifications thereof which do not depart from the spirit and scope of the present invention are intended to be covered by the scope of the present invention.
Claims (9)
1. A power distribution line recovery sequence decision method after a bus fault and power loss is characterized by comprising the following steps:
establishing a user evaluation classification model by taking the existence, the quantity and the importance degree of typical users supplied by each line as index factors for evaluating the emergency degree of fault recovery;
establishing an optimal recovery sequence hierarchical classification model based on a user evaluation classification model, and determining the weight of each index factor; the optimal recovery sequence hierarchical classification model comprises a top layer, a middle layer and a bottom layer; the top layer is a target layer; the middle layer is a criterion layer; the bottom layer is a scheme layer;
determining the total sequence of each line to each evaluation index in the user evaluation classification model by using a sequence method, and obtaining a recovery sequence of the distribution line after power failure; the priority method expresses the importance degree of the load of one line corresponding to the other line by the grade through the grade preference for the same index, then establishes the index priority number, and further determines the total priority number of the line.
2. The method for determining the restoration sequence of the distribution line after the power failure of the bus bar according to claim 1, wherein the standard layer is established by a scaling method, scale symbols are adopted to represent the importance degree between different factors compared in pairs, and a judgment matrix is adopted to determine the weight of each influencing factor; the determination matrix R = [ alpha = [ ] ij ] NxN (ii) a The alpha ij Is the ratio of the importance of factor i to factor j; and N is N evaluation factors of the to-be-tested layer.
3. The method of claim 2, wherein a diagonal element alpha of the determination matrix R is alpha, and the method is used for determining the recovery sequence of the distribution line after the loss of power due to the bus fault ij Is 1, and the main eigenvalue λ of the matrix R is judged max The corresponding characteristic direction is the quantity W = (W) 1 ,w 2 …w N ) T Then alpha ij ＝w i /w j ；
Said w i The influence degree of the ith element of the criterion layer on the target layer; said w j Is the degree of influence of the jth element of the criterion layer on the target layer.
4. The method for determining the restoration sequence of the distribution line after the power failure of the bus bar according to claim 1, wherein the representation mode of the grade comprises a matrix of quantized named values and a construction grade matrix; the expression mode of the matrix of the quantized named values is as follows:
max is stated j {f ij For each line there is a named value f corresponding to the jth index ij Maximum value of (d); the min j {f ij Each line corresponds to the jth index named value f ij The minimum value of (d); d is j ＝max j {f ij }-min j {f ij }; and h is a series of grades.
5. The method for determining the restoration sequence of the distribution line after the power failure of the bus bar according to claim 4, wherein the expression mode of the grade matrix is as follows:
G＝[ɡ ij ] mxn (ii) a Said g is ij The grade of the jth evaluation index corresponding to the ith line is obtained; m is the number of lines to be recovered; and n is the index number corresponding to the number of the m lines to be recovered.
6. The method for determining the restoration sequence of the distribution line after the power failure of the bus bar according to claim 5, wherein the index sequence is expressed in the following manner:
b is ilj The dominance of the ith line relative to the ith line under the index j.
7. The method for determining the restoration sequence of the distribution line after the power failure of the bus bar as claimed in claim 6, wherein the method is characterized in that in b ilj On the basis of the above-mentioned formula (I),
b is il The number of the comprehensive priority of the ith line relative to the ith line is shown; said w j The weights of the indexes determined by the hierarchical analysis model.
8. The method for determining the restoration sequence of the distribution line after the loss of power due to the bus fault as claimed in claim 1, wherein the total number of the priority K of the line i Emergency degree for restoring power transmission with respect to all other lines;
the above-mentioned
Said K min Is K i The medium minimum value.
9. A distribution line recovery sequence decision system after a bus fault and power loss is characterized by comprising a classification model building module, a hierarchy model building module and a recovery sequence building module;
the classification model establishing module is used for establishing a user evaluation classification model by taking the existence, the quantity and the importance degree of typical users supplied by each line as index factors for evaluating the failure recovery emergency degree;
the hierarchical model establishing module is used for establishing an optimal recovery sequence hierarchical classification model based on a user evaluation classification model and determining the weight of each index factor;
the restoration sequence establishing module is used for determining the total sequence of each line for each evaluation index in the user evaluation classification model by using a sequence method to obtain a restoration sequence after the power failure of the distribution line; the priority method expresses the importance degree of the load of one line corresponding to the other line by the grade through the grade preference for the same index, then establishes the index priority number, and further determines the total priority number of the line.
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