CN115603326B - Power distribution network load transfer method and system based on tree topology - Google Patents
Power distribution network load transfer method and system based on tree topology Download PDFInfo
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention discloses a power distribution network load transfer method based on tree topology, which comprises the following steps: step 1, building a power distribution network load model; step 2, establishing a layered power supply tree model according to the power distribution network load model; step 3, if the power-losing line appears, reconstructing a layered power supply tree model corresponding to the power-losing line; step 4, obtaining a load transfer scheme through the reconstructed layered power supply tree model; step 5, trying to close a plurality of interconnection switches to transfer the load of the power-losing circuit; step 6, trying to neglect partial load in the power-off line and searching a scheme for recovering power supply of other loads in the power-off line; and 7, transferring the load of the power-losing circuit according to a transfer scheme. The invention makes up the transfer capability of the distribution network load transfer branch and the sectional transfer layer, ensures that the transfer treatment of the power failure fault is more accurate and refined, has simple realization process calculation, and effectively improves the regulation and control working accuracy and efficiency of the distribution network.
Description
Technical Field
The invention relates to the technical field of power distribution network load transfer, in particular to a power distribution network load transfer method and a power distribution network load transfer system based on tree topology.
Background
The existing load transfer dispatching methods can be basically divided into the following categories:
1) Based on heuristic search algorithms. Searching available tie switches according to the information of the power loss area, and combining the information of electric distance, transfer capacity and the like, and using one or more tie switches to try to completely recover all power loss loads; if the whole power loss area cannot be completely recovered, the part is cut off from a relatively unimportant load on the premise of considering the importance of the load so as to meet the safety constraint. Considering the influence of load variation on load transfer, a load transfer scheme considering recovery time is further provided because of different time load values.
2) Based on a random optimization algorithm. In order to have a relatively high calculation speed, the method only controls the opening and closing of the line, and does not account for the controllability and the cutting of the load, and the obtained scheme is relatively simple. And applying a non-dominant ranking genetic algorithm (NSGA-II) to the power restoration supply of the multi-target multi-constraint power distribution network, and obtaining the Paraffin multi-optimal solution through multi-time optimizing ranking. The model is relatively complete, and the obtained scheme has optimality in a certain sense (relative to calculation time); but has relatively long computation times. The method has the outstanding characteristics that the model is relatively perfect, an optimal or sub-optimal scheme can be obtained in enough calculation time, and the method has better optimizing capability; however, the method has the disadvantage that the calculation time is long, the calculation speed of the online application cannot be achieved, and the method is not suitable for a large-scale network.
3) Expert system method. The expert system can automatically generate a scheme which needs to be operated for fault recovery, has good real-time performance and wide applicability, and can be applied to scheme solving when a network is large. However, the expert system is only time-consuming and labor-consuming in library establishment and integration, and in practice, the fault types are various, and all the situations cannot be recorded.
The prior art comprises the following steps:
in the prior art 1, patent application number 202210801365.9 discloses a distribution network line partial load transfer analysis method and system, firstly, a direct transfer line, an indirect transfer line and a corresponding ring network switch of a ring network of a distribution network line to be analyzed are obtained based on a distribution network line single diagram to generate a ring network data record table; then, based on a ring network data record table and combined with a distribution network line power supply path, acquiring an alternative indirect transfer power supply transfer switch and an alternative indirect transfer power supply transfer load, and analyzing according to data information of the alternative indirect transfer power supply transfer load to obtain a final alternative indirect transfer power supply scheme; and then, based on the ring network data record table and combined with a final alternative indirect power transfer scheme, carrying out power transfer load analysis on the direct power transfer main side distribution network line and all opposite side distribution network lines of the ring network, and obtaining a final direct power transfer scheme and a corresponding indirect power transfer scheme. The method replaces the traditional manual data statistics analysis process, greatly improves the working efficiency, ensures the rapid load transfer under the emergency condition of the power grid, and improves the safe and stable operation level of the power grid and the power supply reliability of users. However, the calculation time of the power conversion scheme is longer, the application is difficult, and the use efficiency is lower.
In the prior art 2, patent application number 201811574651.6 discloses a regional power grid load transfer method, wherein the regional power grid is firstly subjected to 500KV partition and 220KV partition; searching various load transferring measures aiming at the out-of-limit condition of the 500KV main transformer and the 220KV main transformer respectively; evaluating the influence degree of various load transfer measures on the power supply reliability, and carrying out priority classification on the load transfer measures according to the influence degree; then, the load transferring measures with higher priority levels are preferentially selected and executed according to the out-of-limit conditions of the 500KV main transformer and the 220KV main transformer respectively until the corresponding main transformers are not out-of-limit any more. The invention can rapidly select load transfer measures, improves the selection efficiency and the load transfer effect, and is beneficial to reducing the adverse effect of load transfer on the operation of a power grid. However, the method of the invention cannot ensure that all the electricity-deficient loads are transferred as much as possible, and is limited in use.
Disclosure of Invention
The invention aims to overcome the defects that in the prior art, a load transfer method is single and limited in use, and an optimal method for transferring an electricity-deficient load cannot be found out quickly, so that the transfer method is low in efficiency, and provides a power distribution network load transfer method and system based on tree topology.
The invention aims at realizing the following technical scheme:
the power distribution network load transferring method based on the tree topology comprises the following steps:
step 1, building a power distribution network load model;
step 2, a layered power supply tree model is built according to a power distribution network load model, wherein the building of the layered power supply tree model specifically comprises the following steps: taking a power supply end as a root node, taking the feeder line with the longest power supply radius as a trunk during normal operation, taking the rest feeder lines as branches, taking the branch end points in an off state as tie switches, layering the trunk of the power supply tree, sorting layer numbers according to the electric distance from each switch to the node, calculating the load carried by each layer, and regarding the load and the tie branches of the layer as the same layer;
step 3, if the power-losing line appears, reconstructing a layered power supply tree model corresponding to the power-losing line;
step 4, obtaining a load transfer scheme through the reconstructed hierarchical power supply tree model: judging whether a tie switch is closed, and if the load of the power-losing line can be completely transferred to the opposite-side line, acquiring a transfer scheme of the power-losing line if the load of the power-losing line can be completely transferred to the opposite-side line, and if the load of the power-losing line can not be completely transferred to the opposite-side line, jumping to the step 5;
step 5, trying to close a plurality of tie switches to transfer the load of the power-off line, if the plurality of tie switches are closed to restore the load power supply of the power-off line, acquiring a transfer scheme of the power-off line, and if the plurality of tie switches are not closed, jumping to the step 6;
Step 6, neglecting partial load in the power-off line, and searching a transfer scheme for recovering power supply of other loads in the power-off line;
and 7, transferring the load of the power-losing circuit according to a transfer scheme.
The scheme firstly establishes a layered power supply tree model, enables power grid equipment to be related through topology, reconstructs the layered power supply tree model in the load transfer analysis process, and confirms the topological relation of a power loss circuit, and achieves the purpose of segmented transfer through layered quantitative analysis and calculation in the load transfer analysis process. According to the scheme, the situations that a single contralateral line transfers the load of a single power-losing line, a plurality of contralateral lines transfer the load of the single power-losing line and the load of all the power-losing lines cannot be transferred are considered, and important loads or the maximum loads can be guaranteed to be transferred as far as possible are considered.
Preferably, the step 3 specifically includes: the method comprises the steps that an available interconnection switch communicated with a power-losing circuit is taken as a target, one end of the available interconnection switch, which does not belong to the power-losing circuit, is combined to serve as a virtual power source point, all branches are closed, and a network formed at the moment is taken as a target network; when a plurality of available tie switches exist for a certain power failure, the formed target network comprises a plurality of rings, the network is ensured to meet the topological constraint during coding, the target is required to be optimized, and the control variables are the switches in the network and the load shedding amount.
If the number of available tie switches is more than one for a power-losing line, generating loops in a formed target network, and assuming that n tie switches are arranged, forming n-1 loops in the target network, and breaking a branch in each loop to keep the network in a radial state;
the layered power supply tree model is reconstructed through the operation of constructing the matrix, so that the network is kept radial, and the operation of constructing the matrix is specifically as follows:
establishing a dimension n (A L ) Row, n (A) T ) Matrix M of columns, wherein A T and AL The number of branches and the number of branches connected are respectively, each row represents one branch connected, each column represents one branch, and the ith row, the j and the m in the matrix L ij The values are as follows:
wherein ,ej Represents the point of the j-th branch,reference tree t represented in power supply tree 0 Middle connecting branch l i Each branch corresponds to a basic loop, if a certain branch belongs to the basic loop corresponding to the branch, the value in the column corresponding to the branch position in the row is 1, and if 0 indicates that the branch is not in the basic loop corresponding to the branch;
from the reference tree t 0 Starting to form trees with different structures by exchanging branches, and knowing from a method for generating the tree, the connection branches for exchanging must meet the conditions:
wherein ,eik In order for the branches to be exchanged,in order to connect branches that need to be exchanged with the branches,for the current spanning treeMiddle branch e ik A collection of basic cut sets,for e in the reference tree ik A collection of basic cutsets;
according to the spanning tree procedure, first, fromSelecting a branch to replacee 1 There are two situations:
case 1: the selected branch ise 1 Itself, the resulting tree t 1 =t 0 ；
Case 2: the selected branch is t 0 Branch connection l i Then it means that l i The closing of the container is performed and,e 1 cutting off to obtain tree t 1 At this time, mark l i Has been used to exchange branches; for all meeting M 0 [j][i]J rows of =1 and j+.i, exclusive or operation XOR (rowi, rowj, 2);
defining an exclusive or operation XOR (rowi, rowj, 2) between two rows as: for s=2 to N-1, new m [ j ]][s]=m 0 [i][s] xor m 0 [j][s]The method comprises the steps of carrying out a first treatment on the surface of the Then use new m [ j ]][s]Substituted m 0 [j][s]To update the j-th row, the obtained new matrix is M 1 For all unlabeled t 0 Branch connection l i ，m 1 [i][s](s is the meaning of the tree branch from 2 to N-1) is:；
next, the exchange t is simulated 0 In the matrix operation method, the rest branches in the branch set are sequentially exchanged, and the rest branches e k Specifically, the exchange process of (1) is described as follows:
A. if t 0 Branch connection l i The method meets the following conditions: l (L) i Unmarked exchange, and m 0 [i][k]=m k-1 [i][k]=1, then these l i And e k Itself is composed of；
B. From the slaveIn selecting branch to replace e k If select e k The obtained tree t k =t k-1 ，M k =M k-1 The method comprises the steps of carrying out a first treatment on the surface of the Otherwise, if choose l i Will l i Tag exchange, for any un-tag exchanged l i If M k-1 [j][k]The operation XOR (rowi, rowj, k+1) is performed for =1, resulting in a new matrix M; and after replacing all branches in the reference tree, obtaining a new tree, namely obtaining a solution meeting the topological requirement, and completing reconstruction of the layered power supply tree model corresponding to the power loss line.
Preferably, if there are multiple power-losing lines, sorting the power-losing lines from high to low according to the occupation ratio of important loads, and processing each power-losing line according to the sorting, wherein each power-losing line executes steps 3 to 5, and step 4 further includes calculating the residual capacity of the tie switch after the load of the power-losing line can be completely transferred to the opposite-side line, wherein the residual capacity can still be transferred to other power-losing lines;
the step 5 specifically comprises the following steps: the load of the power-losing line is transferred by trying to close a plurality of interconnection switches, if the total load I of the power-losing line lost Sigma I < sum of tie switch capacities m，si And acquiring a transfer scheme of the power-losing line, and jumping to the step 6 if the transfer scheme does not exist, wherein the sum of the capacity of the interconnection switches comprises the capacity of the interconnection switches which are not transferred and the residual capacity of the interconnection switches which are transferred.
Preferably, in the step 5, the transferring of the power loss line by the plurality of tie switches is specifically:
(a) Performing recovery search layer by layer to the power-losing area with a certain contact switch i as a starting point, and assuming that the k layer is searched, the front and rear switches are respectively S (k-1)-(k) and S(k)-(k+1) Judging the k-layer rear switch S (k)-(k+1) Whether it is an on-off switch;
(b) If S (k)-(k+1) Is capable of being opened and closedA switch for setting the total load of the k layer as I lost,k The voltage is calculated to be V through tide k The approximate current is I k =I lost,k /V k Judging whether the current and voltage on the power supply path are out of limit (assuming that the total current of the transferred load is I load Judgment of I m,si ＞I load+Ik ；|V k -1 |is less than or equal to 5%). If not, continuing to search downwards for power supply, otherwise, turning to (c);
if S (k)-(k+1) In order to avoid the switch, the loads of the layers after the k layer are added to the k layer, and the total load is that
∑(I lost,k ) Judging whether the current and the voltage on the power supply path are out of limit, if not, changing the direction to search, otherwise, turning to (c);
(c) Switch S in front of the kth layer is opened (k－1)-(k) The plurality of tie switches finish transferring the power failure line.
Preferably, if there are multiple switching schemes for the power-losing line, the load cut-off amount, the switching operation frequency, the line loss after load switching, the voltage threshold value and the power threshold value of each switching scheme are obtained, and then an objective function C is constructed:
wherein ,
in the formula ,d, for the sum of the load shedding amounts j For the weight coefficient of the j-th load, the coefficient depends on the kind of load,for the total number of switching actions,as the value of the line loss,for the voltage out-of-limit penalty value,for the power out-of-limit penalty value, V j For the voltage amplitude at the j-th point, V j，max and Vj，min Respectively the upper and lower limits of the voltage amplitude of the j point, S j For the current apparent power of the jth line, S j，max Lambda is the upper power limit p ，λ n ，λ k ，λ u ，λ s Respectively the weight coefficients of each item in the objective function;
and taking the transfer scheme with the minimum value of the objective function C in all transfer schemes as the transfer scheme of the power loss line.
The design of this scheme has guaranteed that the result of use of transfer scheme is best, has both reduced loss of electricity and has guaranteed the holistic safe operation of distribution network again.
Preferably, the power distribution network load transferring method based on tree topology further comprises the step of optimizing the objective function C by adjusting the weight coefficient, and further obtaining an optimal transferring scheme, specifically: for the set of transfer schemes of all power-losing lines, calculating the total transfer success rate or total transfer load quantity of the power-losing loads of all power-losing lines, taking the total transfer success rate or the total transfer load quantity as a target, judging whether the set of transfer schemes obtained through the minimum value of the objective function Cmin is the set of transfer schemes with the highest transfer success rate or the maximum transfer load quantity, if so, not adjusting the weight coefficient, and if not, adjusting the weight coefficient of one or more power-losing line objective functions C to obtain a new transfer scheme until the set of transfer schemes obtained through the minimum value of the objective function Cmin is the set of transfer schemes with the highest transfer success rate or the maximum transfer load quantity, wherein the new transfer scheme is the optimal transfer scheme; for a plurality of power failure events, a plurality of corresponding optimal transfer schemes exist, each power failure event comprises the summation of a plurality of power failure lines generated in a time period, and if the number of times of the optimal transfer scheme obtained by a weight coefficient value of a certain objective function C or a weight coefficient interval of the certain objective function C is the largest, the optimization of the objective function C is completed. Because the initial weight coefficient is given according to expert experience, in actual use, errors are often larger due to different conditions, so that the objective function C, namely the weight, can be optimized to achieve the purpose of highest total transfer success rate or maximum total transfer load. And for the objective function C of different power-losing circuits, not only the weight coefficient of a single objective function C, but also the weight coefficients of a plurality of objective functions C can be adjusted, and in the actual application process, because some power-losing circuits have more important weight coefficients and tend to have more fixed weight coefficients, the weight coefficients of other objective functions C can be adjusted only. The design of this scheme has further improved the validity of transferring the scheme.
Preferably, if in step 4, a tie switch is closed, the load of the power-loss line can be completely transferred to the opposite-side line, transfer checking is performed, after assuming that the load of the power-loss line is transferred to the opposite-side line, the timing rate of the opposite-side line is calculated, if the timing rate is smaller than a set threshold value, the transfer checking is judged to be unsuccessful, the load of the power-loss line cannot be completely transferred to the opposite-side line, if the timing rate is larger than or equal to the set threshold value, the checking is judged to be successful, and the load of the power-loss line can be completely transferred to the opposite-side line. According to the scheme, the load transfer of the power-losing circuit is checked, and the load of the power-losing circuit can be completely transferred to the opposite-side circuit only when the check is successful; if the check is unsuccessful, the judgment that the synchronous rate is too small indicates that the overload operation is easy to occur when the load of the opposite side line is transferred to the power loss line, so that potential safety hazard is caused.
Preferably, if in step 4, a tie switch is closed, the load of the power-off line can be completely transferred to the opposite-side line, the capacity richness of the opposite-side line is considered, and if the ratio of the load of the power-off line to the capacity richness of the opposite-side line is smaller than the set value, the opposite-side line is not used as the load transfer target of the power-off line, and the next tie switch is continuously searched. The scheme is not preferable to match the object that the capacity richness of the opposite side line is obviously far greater than that of the interconnecting link, and the capacity richness of the opposite side line is matched as much as possible to be slightly greater than that of the interconnecting link, so that the opposite side line with large capacity richness is ensured to meet the load of the power-losing line with other large requirements, and the efficiency of the transfer scheme is further improved.
A tree topology based power distribution network load transfer system comprising:
the data acquisition unit is used for acquiring power failure line information, normal line information and contact switch information in the distribution network load model;
the data processing unit is used for processing the data of the data acquisition unit, and selecting a transfer scheme to transfer the load of the power-losing line;
the transfer execution unit is used for executing the transfer scheme to transfer the load of the power-losing line;
the power distribution network load transfer system based on the tree topology executes a power distribution network load transfer method based on the tree topology when in operation.
Preferably, the power distribution network load transfer system based on the tree topology further comprises a verification unit, wherein the verification unit is used for verifying the transfer scheme, and the power distribution network load transfer system based on the tree topology executes a power distribution network load transfer method based on the tree topology when in operation.
The electronic equipment comprises a processor and a memory, wherein the memory stores a computer program, and the computer program is loaded and executed by the processor to realize the power distribution network load transferring method based on the tree topology.
A computer readable storage medium having stored thereon a computer program readable by a computer, the computer program being arranged to perform a tree topology based power distribution network load transfer method at run-time.
The beneficial effects of the invention are as follows: the scheme firstly establishes a layered power supply tree model, enables power grid equipment to be related through topology, reconstructs the layered power supply tree model in the load transfer analysis process, and confirms the topological relation of a power loss circuit, and achieves the purpose of segmented transfer through layered quantitative analysis and calculation in the load transfer analysis process. According to the scheme, the situations that a single contralateral line transfers the load of a single power-losing line, a plurality of contralateral lines transfer the load of the single power-losing line and the load of all the power-losing lines cannot be transferred are considered, and important loads or the maximum loads can be guaranteed to be transferred as far as possible are considered.
According to the scheme, the load transfer of the power-losing circuit is checked, and the load of the power-losing circuit can be completely transferred to the opposite-side circuit only when the check is successful; if the check is unsuccessful, the judgment that the synchronous rate is too small indicates that the overload operation is easy to occur when the load of the opposite side line is transferred to the power loss line, so that potential safety hazard is caused.
The scheme does not match the object that the capacity richness of the opposite side line is obviously far greater than that of the contact switch, but matches the situation that the capacity richness of the opposite side line is slightly greater than that of the contact switch as much as possible, so that the opposite side line with large capacity richness is ensured to meet the load of the power-losing line with other large requirements, and the efficiency of the transfer scheme is further improved.
Drawings
FIG. 1 is a schematic view of a construction of the present invention;
fig. 2 is a system schematic block diagram of the present invention.
Wherein: 1. the system comprises a data acquisition unit, a data processing unit, a transfer execution unit and a verification unit.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will clearly and completely describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
It should be understood that, in various embodiments of the present invention, the sequence number of each process does not mean that the execution sequence of each process should be determined by its functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
It should be understood that in the present invention, "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements that are expressly listed or inherent to such process, method, article, or apparatus.
The invention is further described below with reference to the drawings and examples.
Example 1:
the power distribution network load transferring method based on tree topology, as shown in fig. 1, comprises the following steps:
step 1, building a power distribution network load model;
step 2, a layered power supply tree model is built according to a power distribution network load model, wherein the building of the layered power supply tree model specifically comprises the following steps: taking a power supply end as a root node, taking the feeder line with the longest power supply radius as a trunk during normal operation, taking the rest feeder lines as branches, taking the branch end points in an off state as tie switches, layering the trunk of the power supply tree, sorting layer numbers according to the electric distance from each switch to the node, calculating the load carried by each layer, and regarding the load and the tie branches of the layer as the same layer;
Step 3, if the power-losing line appears, reconstructing a layered power supply tree model corresponding to the power-losing line;
step 4, obtaining a load transfer scheme through the reconstructed hierarchical power supply tree model: judging whether a tie switch is closed, and if the load of the power-losing line can be completely transferred to the opposite-side line, acquiring a transfer scheme of the power-losing line if the load of the power-losing line can be completely transferred to the opposite-side line, and if the load of the power-losing line can not be completely transferred to the opposite-side line, jumping to the step 5;
step 5, trying to close a plurality of tie switches to transfer the load of the power-off line, if the plurality of tie switches are closed to restore the load power supply of the power-off line, acquiring a transfer scheme of the power-off line, and if the plurality of tie switches are not closed, jumping to the step 6;
step 6, neglecting partial load in the power-off line, and searching a transfer scheme for recovering power supply of other loads in the power-off line;
and 7, transferring the load of the power-losing circuit according to a transfer scheme.
The scheme firstly establishes a layered power supply tree model, enables power grid equipment to be related through topology, reconstructs the layered power supply tree model in the load transfer analysis process, and confirms the topological relation of a power loss circuit, and achieves the purpose of segmented transfer through layered quantitative analysis and calculation in the load transfer analysis process. According to the scheme, the situations that a single contralateral line transfers the load of a single power-losing line, a plurality of contralateral lines transfer the load of the single power-losing line and the load of all the power-losing lines cannot be transferred are considered, and important loads or the maximum loads can be guaranteed to be transferred as far as possible are considered.
The step 3 specifically comprises the following steps: the method comprises the steps that an available interconnection switch communicated with a power-losing circuit is taken as a target, one end of the available interconnection switch, which does not belong to the power-losing circuit, is combined to serve as a virtual power source point, all branches are closed, and a network formed at the moment is taken as a target network; when a plurality of available tie switches exist for a certain power failure, the formed target network comprises a plurality of rings, the network is ensured to meet the topological constraint during coding, the target is required to be optimized, and the control variables are the switches in the network and the load shedding amount.
If the number of available tie switches is more than one for a power-losing line, generating loops in a formed target network, and assuming that n tie switches are arranged, forming n-1 loops in the target network, and breaking a branch in each loop to keep the network in a radial state;
the layered power supply tree model is reconstructed through the operation of constructing the matrix, so that the network is kept radial, and the operation of constructing the matrix is specifically as follows:
establishing a dimension n (A L ) Row, n (A) T ) Matrix M of columns, wherein A T and AL The number of branches and the number of branches connected are respectively, each row represents one branch connected, each column represents one branch, and the ith row, the j and the m in the matrix L ij The values are as follows:
wherein ,ej Represents the point of the j-th branch,reference tree t represented in power supply tree 0 Middle connecting branch l i Each branch corresponds to a basic loop, if a certain branch belongs to the basic loop corresponding to the branch, the value in the column corresponding to the branch position in the row is 1, and if 0 indicates that the branch is not in the basic loop corresponding to the branch;
from the reference tree t 0 Starting to form trees with different structures by exchanging branches, and knowing from a method for generating the tree, the connection branches for exchanging must meet the conditions:
wherein ,e ik in order for the branches to be exchanged,in order to connect branches that need to be exchanged with the branches,for branches in the current spanning treee ik A collection of basic cut sets,is in the reference treee ik A collection of basic cutsets;
according to the spanning tree procedure, first, fromSelecting a branch to replacee 1 There are two situations:
case 1: the selected branch ise 1 Itself, the resulting tree t 1 =t 0 ；
Case 2: the selected branch is t 0 Branch connection l i Then it means that l i Closing, e 1 Cutting off to obtain tree t 1 At this time, mark l i Has been used to exchange branches; for all meeting M 0 [j][i]J rows of =1 and j+.i, exclusive or operation XOR (rowi, rowj, 2);
defining an exclusive or operation XOR (rowi, rowj, 2) between two rows as: for s=2 to N-1, new m [ j ] ][s]=m 0 [i][s] xor m 0 [j][s]The method comprises the steps of carrying out a first treatment on the surface of the Then use new m [ j ]][s]Substituted m 0 [j][s]To update the j-th row, the obtained new matrix is M 1 For all unlabeled t 0 Branch connection l i ，m 1 [i][s](s is the meaning of the tree branch from 2 to N-1) is:；
next, the exchange t is simulated 0 In the matrix operation method, the rest branches in the branch set are sequentially exchanged, and the rest branches e k Specifically, the exchange process of (1) is described as follows:
A. if t 0 Branch connection l i The method meets the following conditions: l (L) i Unmarked exchange, and m 0 [i][k]=m k-1 [i][k]=1, then these l i And (3) withe k Itself is composed of；
B. From the slaveIn selecting branch replacemente k If chosen toe k The obtained tree t k =t k-1 ，M k =M k-1 The method comprises the steps of carrying out a first treatment on the surface of the Otherwise, if choose l i Will l i Tag exchange, for any un-tag exchanged l i If M k-1 [j][k]The operation XOR (rowi, rowj, k+1) is performed for =1, resulting in a new matrix M; and after replacing all branches in the reference tree, obtaining a new tree, namely obtaining a solution meeting the topological requirement, and completing reconstruction of the layered power supply tree model corresponding to the power loss line.
When the load of the distribution network is transferred, the transfer can be performed by meeting constraint conditions, wherein the constraint conditions comprise:
network topology constraints: the distribution network must meet radial operating conditions.
Constraint of a tide equation: the load transfer back system must satisfy the constraint of the flow equation.
in the formula The total active value of the node i is;the voltage value of the node i;the voltage value of the node j;reactive value for node i；The voltage phase angle difference is the node i node j;
node voltage constraint: all node voltages in the network after transfer do not exceed a given upper and lower limit., in the formula Andrespectively the upper and lower limit values of the node voltage.
Device capacity constraints: and the overload of equipment elements such as a line, a main transformer and the like after load transfer is ensured.
The embodiment 2 of the present invention is different from the embodiment in that if there are multiple power-losing lines, the power-losing lines are ordered from high to low according to the occupation ratio of important loads, each power-losing line is processed according to the order, and each power-losing line performs steps 3 to 5, and step 4 further includes calculating the remaining capacity of the tie switch after the load of the power-losing line can be completely transferred to the opposite line, and the remaining capacity can still be transferred to the remaining power-losing lines;
the step 5 specifically comprises the following steps: the load of the power-losing line is transferred by trying to close a plurality of interconnection switches, if the total load I of the power-losing line lost Sigma I < sum of tie switch capacities m，si And acquiring a transfer scheme of the power-losing line, and jumping to the step 6 if the transfer scheme does not exist, wherein the sum of the capacity of the interconnection switches comprises the capacity of the interconnection switches which are not transferred and the residual capacity of the interconnection switches which are transferred.
In the step 5, the transferring of the power loss line by the plurality of tie switches is specifically as follows:
(a) Performing recovery search layer by layer to the power-losing area with a certain contact switch i as a starting point, and assuming that the k layer is searched, switching the contact switch into a front switch and a rear switchAre respectively S (k-1)-(k) and S(k)-(k+1) Judging the k-layer rear switch S (k)-(k+1) Whether it is an on-off switch;
(b) If S (k)-(k+1) For the switchable switch, the total load of the k layer is I lost,k The voltage is calculated to be V through tide k The approximate current is I k =I lost,k /V k Judging whether the current and voltage on the power supply path are out of limit (assuming that the total current of the transferred load is I load Judgment of I m,si ＞I load+Ik ；|V k -1 |is less than or equal to 5%). If not, continuing to search downwards for power supply, otherwise, turning to (c);
if S (k)-(k+1) In order to avoid the switch, the loads of the layers after the k layer are added to the k layer, and the total load is that
∑(I lost,k ) Judging whether the current and the voltage on the power supply path are out of limit, if not, changing the direction to search, otherwise, turning to (c);
(c) Switch S in front of the kth layer is opened (k－1)-(k) The plurality of tie switches finish transferring the power failure line.
If a plurality of transfer schemes exist for a power-losing line, acquiring the load cut-off quantity, the switching operation times, the line loss after load transfer, the voltage limit value and the power limit value of each transfer scheme, and then constructing an objective function C:
wherein ,
in the formula ,cutting for each loadSum of the amounts d j For the weight coefficient of the j-th load, the coefficient depends on the kind of load,for the total number of switching actions,as the value of the line loss,for the voltage out-of-limit penalty value,for the power out-of-limit penalty value, V j For the voltage amplitude at the j-th point, V j，max and Vj，min Respectively the upper and lower limits of the voltage amplitude of the j point, S j For the current apparent power of the jth line, S j，max Lambda is the upper power limit p ，λ n ，λ k ，λ u ，λ s Respectively the weight coefficients of each item in the objective function;
and taking the transfer scheme with the minimum value of the objective function C in all transfer schemes as the transfer scheme of the power loss line.
The design of this scheme has guaranteed that the result of use of transfer scheme is best, has both reduced loss of electricity and has guaranteed the holistic safe operation of distribution network again.
The power distribution network load transferring method based on the tree topology further comprises the step of optimizing an objective function C by adjusting a weight coefficient, and further obtaining an optimal transferring scheme, specifically comprising the following steps: for the set of transfer schemes of all power-losing lines, calculating the total transfer success rate or total transfer load quantity of the power-losing loads of all power-losing lines, taking the total transfer success rate or the total transfer load quantity as a target, judging whether the set of transfer schemes obtained through the minimum value of the objective function Cmin is the set of transfer schemes with the highest transfer success rate or the maximum transfer load quantity, if so, not adjusting the weight coefficient, and if not, adjusting the weight coefficient of one or more power-losing line objective functions C to obtain a new transfer scheme until the set of transfer schemes obtained through the minimum value of the objective function Cmin is the set of transfer schemes with the highest transfer success rate or the maximum transfer load quantity, wherein the new transfer scheme is the optimal transfer scheme; for a plurality of power failure events, a plurality of corresponding optimal transfer schemes exist, each power failure event comprises the summation of a plurality of power failure lines generated in a time period, and if the number of times of the optimal transfer scheme obtained by a weight coefficient value of a certain objective function C or a weight coefficient interval of the certain objective function C is the largest, the optimization of the objective function C is completed. Because the initial weight coefficient is given according to expert experience, in actual use, errors are often larger due to different conditions, so that the objective function C, namely the weight, can be optimized to achieve the purpose of highest total transfer success rate or maximum total transfer load. And for the objective function C of different power-losing circuits, not only the weight coefficient of a single objective function C, but also the weight coefficients of a plurality of objective functions C can be adjusted, and in the actual application process, because some power-losing circuits have more important weight coefficients and tend to have more fixed weight coefficients, the weight coefficients of other objective functions C can be adjusted only. The design of this scheme has further improved the validity of transferring the scheme.
Embodiment 3 is different from embodiment 2 in that if in step 4, a tie switch is closed, and the power loss line load can be completely transferred to the opposite side line, transfer check is performed, after assuming that the power loss line load is transferred to the opposite side line, a timing rate of the opposite side line is calculated, if the timing rate is less than 80%, it is determined that transfer check is unsuccessful, the power loss line load cannot be completely transferred to the opposite side line, and if the timing rate is greater than or equal to a set threshold, it is determined that check is successful, and the power loss line load can be completely transferred to the opposite side line. According to the scheme, the load transfer of the power-losing circuit is checked, and the load of the power-losing circuit can be completely transferred to the opposite-side circuit only when the check is successful; if the check is unsuccessful, the judgment that the synchronous rate is too small indicates that the overload operation is easy to occur when the load of the opposite side line is transferred to the power loss line, so that potential safety hazard is caused.
If in step 4, a tie switch is closed, the load of the power-off line can be completely transferred to the opposite-side line, the capacity richness of the opposite-side line is considered, if the ratio of the load of the power-off line to the capacity richness of the opposite-side line is smaller than the set value, the opposite-side line is not used as a load transfer target of the power-off line, and the next tie switch is continuously searched. The scheme is not preferable to match the object that the capacity richness of the opposite side line is obviously far greater than that of the interconnecting link, and the capacity richness of the opposite side line is matched as much as possible to be slightly greater than that of the interconnecting link, so that the opposite side line with large capacity richness is ensured to meet the load of the power-losing line with other large requirements, and the efficiency of the transfer scheme is further improved.
The application also discloses a power distribution network load transfer system based on tree topology, as shown in fig. 2, comprising:
the data acquisition unit 1 is used for acquiring power failure line information, normal line information and contact switch information in the distribution network load model;
the data processing unit 2 is used for processing the data of the data acquisition unit, and selecting a transfer scheme to transfer the load of the power-losing line;
the transfer execution unit 3 executes the transfer scheme to transfer the load of the power-losing line;
and the verification unit 4 is used for verifying the transfer scheme.
The power distribution network load transfer system based on the tree topology executes a power distribution network load transfer method based on the tree topology when in operation.
The application also discloses an electronic device comprising a processor and a memory, wherein the memory stores a computer program, and the computer program is loaded and executed by the processor to realize the power distribution network load transfer method based on the tree topology.
The application also discloses a computer readable storage medium having stored thereon a computer program readable by a computer, the computer program being arranged to perform a tree topology based power distribution network load transfer method at run-time.
The processor in the above embodiments may be a central processing unit CPU, a general purpose processor, a digital signal processor DSP, ASIC, FPGA or other programmable logic device, transistor logic device, hardware components, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules, and circuits described in connection with this disclosure. Combinations of computing functions may also be implemented, for example, as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, or the like. The memory may include, but is not limited to: various media capable of storing computer programs, such as a USB flash disk, a read-only memory, a mobile hard disk, a magnetic disk or an optical disk.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The solutions in the embodiments of the present application may be implemented in various computer languages, for example, object-oriented programming language Java, and an transliterated scripting language JavaScript, etc.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
The technical characteristics form the optimal embodiment of the application, have stronger adaptability and optimal implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.
Claims (7)
1. The power distribution network load transfer method based on the tree topology is characterized by comprising the following steps of:
step 1, building a power distribution network load model;
step 2, a layered power supply tree model is built according to a power distribution network load model, wherein the building of the layered power supply tree model specifically comprises the following steps: taking a power supply end as a root node, taking the feeder line with the longest power supply radius as a trunk during normal operation, taking the rest feeder lines as branches, taking the branch end points in an off state as tie switches, layering the trunk of the power supply tree, sorting layer numbers according to the electric distance from each switch to the node, calculating the load carried by each layer, and regarding the load and the tie branches of the layer as the same layer;
step 3, if the power-losing line appears, reconstructing a layered power supply tree model corresponding to the power-losing line;
step 4, obtaining a load transfer scheme through the reconstructed hierarchical power supply tree model: judging whether a tie switch is closed, and if the load of the power-losing line can be completely transferred to the opposite-side line, acquiring a transfer scheme of the power-losing line if the load of the power-losing line can be completely transferred to the opposite-side line, and if the load of the power-losing line can not be completely transferred to the opposite-side line, jumping to the step 5;
Step 5, trying to close a plurality of tie switches to transfer the load of the power-off line, if the plurality of tie switches are closed to restore the load power supply of the power-off line, acquiring a transfer scheme of the power-off line, and if the plurality of tie switches are not closed, jumping to the step 6;
step 6, neglecting partial load in the power-off line, and searching a transfer scheme for recovering power supply of other loads in the power-off line;
step 7, transferring the load of the power-losing circuit according to a transferring scheme;
if a plurality of power-losing lines exist, sequencing the power-losing lines from high to low according to the occupation proportion of important loads, and processing each power-losing line according to the sequencing, wherein each power-losing line executes steps 3 to 5, and step 4 further comprises calculating the residual capacity of the connecting switch after the load of the power-losing line can be completely transferred to the opposite-side line, wherein the residual capacity can still be transferred for the other power-losing lines;
the step 5 specifically comprises the following steps: the load of the power-losing line is transferred by trying to close a plurality of interconnection switches, if the total load I of the power-losing line lost Sigma I < sum of tie switch capacities m，si Acquiring a transfer scheme of the power-losing line, and jumping to a step 6 if the transfer scheme does not exist, wherein the sum of the capacity of the interconnection switches comprises the capacity of the interconnection switch which is not transferred and the residual capacity of the interconnection switch which is transferred; in the step 5, the transferring of the power loss line by the plurality of tie switches is specifically as follows:
(a) Performing recovery search layer by layer to the power-losing area with a certain contact switch i as a starting point, and assuming that the k layer is searched, the front and rear switches are respectively S (k-1)-(k) and S(k)-(k+1) Judging the k-layer rear switch S (k)-(k+1) Whether it is an on-off switch;
(b) If S (k)-(k+1) For the switchable switch, the total load of the k layer is I lost,k The voltage is calculated to be V through tide k The approximate current is I k ＝I lost,k /V k Judging whether the current and the voltage on the power supply path are out of limit, if not, continuing to search for power supply downwards, otherwise, turning to (c);
if S (k)-(k+1) To avoid the switch, the loads of the layers after the k layer are added to the k layer, and the total load is sigma (I) lost,k ) Judging whether the current and the voltage on the power supply path are out of limit, if not, changing the direction to search, otherwise, turning to (c);
(c) Switch S in front of the kth layer is opened (k－1)-(k) The plurality of contact switches finish transferring the power failure line in the current time;
if a plurality of transfer schemes exist for a power-losing line, acquiring the load cut-off quantity, the switching operation times, the line loss after load transfer, the voltage limit value and the power limit value of each transfer scheme, and then constructing an objective function C:
wherein , in the formula ,d, for the sum of the load shedding amounts j For the weight coefficient of the j-th load, the coefficient depends on the kind of load, For the total number of switch actions, +.>For the line loss value, < >>For the voltage out-of-limit penalty value, < >>For the power out-of-limit penalty value, V j For the voltage amplitude at the j-th point, V j，max and Vj，min Respectively the upper and lower limits of the voltage amplitude of the j point, S j For the current apparent power of the jth line, S j，max Lambda is the upper power limit p ，λ n ，λ k ，λ u ，λ s Respectively are eachWeight coefficients of the term in the objective function;
taking the transfer scheme with the minimum value of the objective function C in all transfer schemes as the transfer scheme of the power-losing circuit;
the power distribution network load transferring method based on the tree topology further comprises the step of optimizing an objective function C by adjusting a weight coefficient, and further obtaining an optimal transferring scheme, specifically comprising the following steps: for the set of transfer schemes of all power-losing lines, calculating the total transfer success rate or total transfer load quantity of the power-losing loads of all power-losing lines, taking the total transfer success rate or the total transfer load quantity as a target, judging whether the set of transfer schemes obtained through the minimum value of the objective function Cmin is the set of transfer schemes with the highest transfer success rate or the maximum transfer load quantity, if so, not adjusting the weight coefficient, and if not, adjusting the weight coefficient of one or more power-losing line objective functions C to obtain a new transfer scheme until the set of transfer schemes obtained through the minimum value of the objective function Cmin is the set of transfer schemes with the highest transfer success rate or the maximum transfer load quantity, wherein the new transfer scheme is the optimal transfer scheme; for a plurality of power failure events, a plurality of corresponding optimal transfer schemes exist, each power failure event comprises the sum of a plurality of power failure lines generated in a time period, and if the number of times of the optimal transfer scheme obtained by a weight coefficient value of a certain objective function C or a weight coefficient interval of the certain objective function C is the largest, the optimization of the objective function C is completed;
If a tie switch is closed in the step 4, the load of the power-losing line can be completely transferred to the opposite-side line, transfer checking is performed, after the load of the power-losing line is assumed to be transferred to the opposite-side line, the synchronous rate of the opposite-side line is calculated, if the synchronous rate is smaller than a set threshold value, the transfer checking is judged to be unsuccessful, the load of the power-losing line cannot be completely transferred to the opposite-side line, and if the synchronous rate is larger than or equal to the set threshold value, the check is judged to be successful, and the load of the power-losing line can be completely transferred to the opposite-side line.
2. The method for transferring loads to a power distribution network based on tree topology according to claim 1, wherein said step 3 is specifically: the method comprises the steps that an available interconnection switch communicated with a power-losing circuit is taken as a target, one end of the available interconnection switch, which does not belong to the power-losing circuit, is combined to serve as a virtual power source point, all branches are closed, and a network formed at the moment is taken as a target network;
if the number of available tie switches is more than one for a power-losing line, generating loops in a formed target network, and assuming that n tie switches are arranged, forming n-1 loops in the target network, and breaking a branch in each loop to keep the network in a radial state; the layered power supply tree model is reconstructed through the operation of constructing the matrix, so that the network is kept radial, and the operation of constructing the matrix is specifically as follows:
Establishing a dimension n (A L ) Row, n (A) T ) Matrix M of columns, wherein A T and AL The number of branches and the number of branches connected are respectively, each row represents one branch connected, each column represents one branch, and the ith row, the j and the m in the matrix L ij The values are as follows:
wherein ,ej Represents the point of the j-th branch,reference tree t represented in power supply tree 0 Middle connecting branch l i Each branch corresponds to a basic loop, if a certain branch belongs to the basic loop corresponding to the branch, the value in the column corresponding to the branch position in the row is 1, and if 0 indicates that the branch is not in the basic loop corresponding to the branch;
from the reference tree t 0 Starting to form trees with different structures by exchanging branches, and knowing from a method for generating the tree, the connection branches for exchanging must meet the conditions:
wherein ,eik For branches to be exchanged, e' j In order to connect branches that need to be exchanged with the branches,for branch e in the current spanning tree ik Set of basic cutsets, ++>For e in the reference tree ik A collection of basic cutsets;
according to the spanning tree procedure, first, fromSelect one branch to replace e 1 There are two situations:
case 1: the selected branch is e 1 Itself, the resulting tree t 1 ＝t 0 ；
Case 2: the selected branch is t 0 Branch connection l i Then it means that l i Closing, e 1 Cutting off to obtain tree t 1 At this time, mark l i Has been used to exchange branches; for all meeting M 0 [j][i]J rows of =1 and j+.i, do exclusive or operation XOR;
defining an exclusive-or operation XOR between two rows as: for s=2 to N-1, new m [ j ]][s]＝m 0 [i][s]xor m 0 [j][s]The method comprises the steps of carrying out a first treatment on the surface of the Then use new m [ j ]][s]Substituted m 0 [j][s]To update the j-th row, the obtained new matrix is M 1 For all unlabeled t 0 Branch connection l i ，m 1 [i][s]Meaning of (2):
next, the exchange t is simulated 0 In the matrix operation method, the rest branches in the branch set are sequentially exchanged, and the rest branches e k Specifically, the exchange process of (1) is described as follows:
A. if t 0 Branch connection l i The method meets the following conditions: l (L) i Unmarked exchange, and m 0 [i][k]＝m k-1 [i][k]=1, then these l i And e k Itself is composed of
B. From the slaveIn selecting branch to replace e k If select e k The obtained tree t k ＝t k-1 ，M k ＝M k-1 The method comprises the steps of carrying out a first treatment on the surface of the Otherwise, if choose l i Will l i Tag exchange, for any un-tag exchanged l i If M k-1 [j][k]The operation XOR (rowi, rowj, k+1) is performed for =1, resulting in a new matrix M; and after replacing all branches in the reference tree, obtaining a new tree, namely obtaining a solution meeting the topological requirement, and completing reconstruction of the layered power supply tree model corresponding to the power loss line.
3. The tree topology-based power distribution network load transfer method according to claim 1, wherein if in step 4, one tie switch is closed, the load of the power-off line can be completely transferred to the opposite-side line, the capacity richness of the opposite-side line is considered, if the ratio of the load of the power-off line to the capacity richness of the opposite-side line is smaller than a set value, the opposite-side line is not used as a power-off line load transfer target, and the next tie switch is continuously searched.
4. The utility model provides a distribution network load transfer system based on tree topology which characterized by includes:
the data acquisition unit is used for acquiring power failure line information, normal line information and contact switch information in the distribution network load model; the data processing unit is used for processing the data of the data acquisition unit, and selecting a transfer scheme to transfer the load of the power-losing line;
the transfer execution unit is used for executing the transfer scheme to transfer the load of the power-losing line;
a tree topology based power distribution network load transfer system that performs the tree topology based power distribution network load transfer method of any one of claims 1 to 3 at run time.
5. The tree topology-based power distribution network load transfer system of claim 4, further comprising a verification unit, wherein the verification unit is configured to verify the transfer scheme, specifically:
if a tie switch is closed in the step 4, the load of the power-losing line can be completely transferred to the opposite-side line, transfer checking is carried out, after the load of the power-losing line is supposed to be transferred to the opposite-side line, the synchronous rate of the opposite-side line is calculated, if the synchronous rate is smaller than a set threshold value, the transfer checking is judged to be unsuccessful, the load of the power-losing line cannot be completely transferred to the opposite-side line, if the synchronous rate is larger than or equal to the set threshold value, the checking is judged to be successful, and the load of the power-losing line can be completely transferred to the opposite-side line;
Or if in step 4, closing a tie switch, and fully transferring the load of the power-losing line to the opposite-side line, considering the capacity richness of the opposite-side line, and if the ratio of the load of the power-losing line to the capacity richness of the opposite-side line is smaller than the set value, the opposite-side line is not used as a load transferring target of the power-losing line, and the next tie switch is continuously searched.
6. An electronic device comprising a processor and a memory, wherein the memory stores a computer program that is loaded and executed by the processor to implement the tree topology based power distribution network load transfer method of any one of claims 1 to 3.
7. A computer readable storage medium, characterized in that the storage medium has stored thereon a computer program readable by a computer, the computer program being arranged to perform the tree topology based distribution network load transfer method according to any of claims 1 to 3 when run.
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