CN106711996B - A kind of bus loss of pressure failure service restoration and switching operation generation method - Google Patents
A kind of bus loss of pressure failure service restoration and switching operation generation method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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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
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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 kind of bus loss of pressure failure service restoration and switching operation generation methods, by the CSP model for establishing power distribution network, and in such a way that dynamic asynchronous backtracking algorithm finds the contact element load load for meeting the constraint relationship and most objective function optimization, each contact element loads the variation of load method to generate the switching operation generation method based on each contact element before and after comparing service restoration, the result of obtained switching operation is supplied to operational order system, the person's of being scheduled for decision executes or automatic execution, keep the speed of service restoration more quick.The present invention uses the switching operation generation method based on contact element load load method variation before and after service restoration, it is simple to operation, and it will not there is a situation where feeder line overload or closed loops etc. to be unsatisfactory for service restoration requirement, such method has feasibility for current distribution net work structure, it is easy to implement, is convenient for dispatcher's quick and safe transfer load in this large-area power-cuts of generation bus loss of pressure.
Description
The technical field is as follows:
the invention relates to a power supply recovery process during large-area power failure caused by power distribution network bus voltage loss and a power supply recovery switch operation sequence generation method, and belongs to the field of feeder automation.
Secondly, the background technology:
along with the development of social economy and the improvement of living standard, people have increasingly strong dependence on electric energy, the requirement on power supply reliability is also continuously improved, the power distribution network is large in scale and complex in wiring, and system faults caused by accidental factors are difficult to avoid. The faults frequently occurring in the power distribution network are small disturbances such as feeder faults, for the small disturbances, a dispatcher can not cause larger accidents if the dispatchers transfer non-fault power loss loads by experience, the success rate of load transfer is higher, however, large-area power failure accidents such as bus voltage loss are not frequently occurring like the feeder faults, but basically occur every year, the feeder overload is caused by improper operation or larger-area power failure accidents are caused by only experience processing, the fault processing time is long by only experience, and more economic losses are caused, so that a power supply recovery method of the loads after the bus voltage loss faults is necessary to be researched and a switching operation sequence is generated.
The power supply recovery of the power distribution network refers to an optimization problem of how to realize power supply recovery of a non-fault power failure area on the basis of fault location and isolation. The power supply recovery of the power distribution network is essentially network reconstruction after a fault occurs, and the power supply recovery method which is optimal for one or more objective functions is found by changing the on-off states of contact elements and section switches in the network on the premise of meeting various constraints of the power distribution network after the fault is positioned and isolated.
For the problem of power supply restoration of the power distribution network, many solutions can be adopted, such as: searching a recovery scheme by using a heuristic search method; carrying out fuzzy evaluation on the candidate scheme by using a fuzzy mathematic method; optimizing by using intelligent algorithms such as a genetic algorithm, a simulated annealing method, an expert system method and the like; and the power supply recovery can also be realized by adopting multi-agent technology. The research on the power supply recovery problem of large-area power failure is less, the existing methods include a mathematical optimization method, a genetic algorithm, a multi-agent immune algorithm, a tabu search algorithm and the like, and the power supply recovery method after large-area power failure of the power distribution network after the distributed power supply is connected is considered in the literature. The tabu search algorithm has strong dependence on initial values, tabu lengths and the number of candidate solutions, and the operation result may fall into local optimum, so that the global optimum solution cannot be obtained certainly. The genetic algorithm is easy to generate a large number of infeasible solutions, has a good effect of optimizing and reconstructing the power distribution network, but is not very suitable for the problem of large-area fault load recovery. The invention adopts a CSP model-based power supply recovery method, adopts an asynchronous backtracking algorithm for optimization, simultaneously considers the importance degree of loads, and finally provides a switch operation sequence generation method for facilitating quick and safe load transfer of dispatchers.
Thirdly, the invention content:
the technical problem to be solved by the invention is as follows: the bus under-voltage fault power supply recovery and switch operation sequence generation method based on the CSP model and considering load importance and load loading mode change of the communication elements is provided, and dispatching personnel can transfer loads quickly and safely during large-area power failure such as bus under-voltage.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a bus voltage loss fault power supply recovery and switch operation sequence generation method is characterized in that power supply recovery is a target function for reducing power failure economic loss maximization, a power distribution network reconstruction result is presented in a mode of change of a load loading mode of an interconnection element, a switch operation sequence is generated on the basis of change of the load loading mode of the interconnection element before and after power supply recovery, and the method specifically comprises the following steps:
A. reading network parameters of the power distribution network:
the method is characterized in that a power distribution network simplified model is adopted, namely the power distribution network is regarded as a graph, feeder switches along a power distribution line are regarded as vertexes of the graph, feeders between the two vertexes are regarded as edges of the graph, for simplicity and convenience of calculation, three-phase imbalance factors are ignored, the voltage on the power distribution network is assumed to be equal everywhere, line loads are reflected by currents representing phases, a data structure representing network parameters of the power distribution network is established, and definition is carried outNMatrix of rows and 8 columnsDNamely:
wherein,d i1 number of the described edge, whereini=1,2,...N，NDescribed as the total number of edges;d i2 ~d i4 describing the serial number of the node connected with the edge, wherein the edge is connected with three nodes when T is connected;d i5 ~d i7 the side corresponding to the T-junction is adjacent to three sides,d i8 representing the load magnitude of the side, expressed in terms of the current representing the phase;Dthe idle elements in the matrix are all-1;
B. and (3) judging and isolating faults when the bus is in voltage loss, and storing the load loading mode of each communication element after fault isolation:
if the voltage of a certain bus is reduced to be approximately 0 from a normal value, and the current of a source point connected with the bus or the voltage and the current of a primary switch of a corresponding distribution line are reduced to be approximately 0 from the normal value, the bus is judged to be under voltage loss, and the number of the source points can be 2-5 generally; when a bus fails, the power distribution network automatically cuts off a source point breaker connected with the bus to isolate the fault, and simultaneously stores information of loads loaded by other contact elements connected with the cut feeder;
C. and optimizing the load power supply restoration of the power distribution network to obtain the load loading mode of each contact element after restoration:
constructing a CSP model satisfying the problem of power distribution network constraint, wherein the CSP model is described as a tripleP=（X,D,C），XIs a set of variables, denoted herein as a set of communicating elements;Dis composed ofXThe cartesian product of the domain of each variable in (a),D i is shown asiEach mode is represented by a load tree which takes a switch as a node and a load as an edge;Cto be a constraint set, the power restoration scheme must satisfy the constraintsCThe power restoration of the distribution network must satisfy the following constraints:
(1) the node voltage is in an allowable range;
(2) the load of the communication element does not exceed the rated value;
(3) operating in a network radiation mode;
the constraints (1) and (2) are checked and satisfied within the domain of the variables, the constraint (3) being equivalent to each load being supplied by one interconnection element, i.e. the loads loaded by any two interconnection elements do not have the same element, using the matrix shown belowR ij To represent the constraint relationship between two contact elements:
wherein the communication elementiIn a manner of loadingmSeed, communication elementjIn a manner of loadingnSeed, communication elementiTo (1) apLoad-carrying mode and communication elementjTo (1) aqFetching when there is no same element in the load loading modea pq Is 1, and takes the value of 0 when the same element is contained;
R ij the matrix elements in the matrix can not be randomly arranged, all load-loading modes in each connection element are arranged from large to small according to a target function, and the matrix elements are numbered to obtain a constraint matrix; considering the objective function to reduce the power failure economic loss to the maximum, that is, the total power failure loss cost corresponding to the loaded load is the maximum, the formula is:
wherein,N i to communicate the componentiThe number of loads loaded;k b is as followsbThe unit power failure economic loss cost corresponding to each load is the cost of some sensitive usersHowever, the unit power failure economic loss cost is not large, but belongs to sensitive load, and the power failure can also cause large influence, so thatk×k b Instead of the formerk b ，kTaking 3-5;p b is as followsbThe size of each load is reflected by current;
after the CSP model with the constraint satisfaction problem is established, searching for an optimal solution is needed, a backtracking algorithm is adopted for searching, a power supply recovery scheme which meets the constraint condition and enables the power failure economic loss corresponding to the load loaded by the total contact element to be maximum is found, and the optimized mode of loading the load by the contact element is obtained;
D. obtaining a switching operation sequence in the power supply recovery process by comparing the change of the load loading modes of the communication elements before and after power supply recovery of the power distribution network; the switching operation sequence of the power supply recovery process comprises the following specific steps:
the first step is as follows: from the set of variablesXTaking out a connection element, and placing the serial number of the edge corresponding to the load loaded by the connection element before the power supply is recovered into a queueF B In the method, after the power supply is recovered, the serial number of the side corresponding to the load loaded by the communication element is put into a queueF A Comparison of middle and topF B AndF A obtaining the load tree carried by the newly accessed connection element after the power supply is recovered and the feeder load cut from the load tree, and placing the serial number of the edge corresponding to the feeder load of the newly accessed load tree into a queueF in In the method, the serial numbers of the edges corresponding to the feeder loads cut from the load tree are put into a queueF out Performing the following steps;
the second step is that: to queueF in AndF out the elements in (1) are classified according to the connection mode ifF in /F out If the middle element has no adjacent relation with any other element in the queue, the element is put into the queueF in1 /F out1 Performing the following steps; other members having an abutting relationshipThe elements are divided into different load strings, and each load string is regarded as a whole and put into a queueF in2 /F out2 In, there is no adjacency between different load strings; will be provided withF in1 AndF in2 the elements in the system are arranged in respective queues according to the cost of the power failure economic loss from large to small,F out1 andF out2 the elements in the queue are arranged in respective queues from small to large according to the economic loss cost of power failure;
the switch operation sequence is carried out according to the principle that the load is cut off first and then the load is connected, the operation is simple first and then complex, and the important load is connected first and then cut off, so that the queue is cut off sequentially firstF out1 AndF out2 then accessing the corresponding loadF in1 AndF in2 the corresponding load in (1);
the third step: for theF out1 The load to be cut off, one element is taken out, and the side adjacent to the load is foundF B The switch serial number between the two sides is put into a disconnecting switch queue S;
the fourth step: repeating the third step untilF out1 Is empty;
the fifth step: for theF out2 In the load string, find the load string adjacent to the sideF B The switch serial numbers between the edges are put into a disconnecting switch queue S;
and a sixth step: repeating the fifth step untilF out2 Is empty;
the seventh step:F in1 andF in2 the elements in the sequence and the method from the third step to the sixth step are used for putting the serial number of the switch to be closed into a closed switch queueTIn, will remove the closed switch queue at the same timeTThe other periphery of the element except the switch serial number in the closed stateSwitch sequence number put into disconnection switch queueSPerforming the following steps;
this allows the creation of a queue of disconnect switches based on the contact elementSAnd closing the switch queueTWhen the switch is operated, if the switch state is in the required state before the operation, the switch state is kept unchanged;
eighth step: if it isXIf not, returning to the first step.
In step "D", the switch operation sequence referred to should satisfy the following requirements:
⑴ operation process keeps network radiation mode operation;
⑵ no overload is generated during operation;
⑶ should be able to recover as quickly as possible during operation to supply power to the load with the economic loss of power.
The communication element is a normally-operated element capable of loading a fault area load.
The invention has the following positive beneficial effects:
1. the power supply recovery method based on the CSP model is simple and easy to realize by software, adopts the asynchronous backtracking algorithm for optimization, simultaneously considers the importance degree of the load, is convenient for dispatching personnel to quickly and safely transfer the load, and ensures that the power supply recovery speed is quicker.
2. The invention considers the importance degree of the load, aims at minimizing the economic loss caused by power failure, and simultaneously considers the influence of sensitive load on the work of the power grid.
3. The invention adopts the switch operation sequence generation method based on the change of the load loading mode of the interconnection elements before and after power supply recovery, is simple and easy to operate, and can not generate the condition that the power supply recovery requirement is not met, such as feeder line overload or closed loop and the like.
Fourthly, explanation of the attached drawings:
FIG. 1 is a detailed flow chart of power restoration after a bus voltage loss fault according to the present invention;
FIG. 2 is a flow chart of the sequence of switch operations according to the present invention;
fig. 3 is a test example in the embodiment of the present invention.
The fifth embodiment is as follows:
the invention is further explained and explained below with reference to the drawings and examples (see fig. 1 to 3):
example (b): a method for generating a bus voltage loss fault power supply recovery and a switch operation sequence is disclosed, wherein the load recovery is a target function for reducing the power failure economic loss to be maximum, a power distribution network reconstruction result is presented in a mode of changing a load loading mode of a contact element, and the switch operation sequence is generated on the basis of the change of the load loading mode of the contact element before and after power supply recovery, and specifically comprises the following steps:
A. reading network parameters of the power distribution system:
as shown in the test example of FIG. 3, line load is reflected in current representing a phase, and a data structure representing system network parameters is established, i.e., a matrix of 12 rows and 8 columnsDI.e. by
Wherein,d i1 (i =1, 2.. N) a sequence number describing the edge;d i2 ~d i4 describing the serial number of the node connected with the edge, wherein the edge is connected with three nodes when T is connected;d i5 ~d i7 the number of the side adjacent to the side is T-connected with the corresponding sideIs adjacent to the three sides of the frame,d i8 representing the load magnitude of the side, expressed in terms of the current representing the phase;Dthe idle elements in the matrix are all-1;
B. and (3) judging and isolating faults when the bus is in voltage loss, and storing the load loading mode of each communication element after the faults are cut off:
if the voltage of a bus decreases from a normal value to approximately 0, and the bus is connected with the busNThe current of each source point or the voltage and the current of the first-stage switch of the corresponding distribution line are reduced to be approximately 0 from the normal value, and the bus voltage loss can be judged, generallyN2-5 times of bus faults can be taken, the system automatically cuts off a source point breaker connected with the bus to isolate faults, and meanwhile, information of loads loaded by other contact elements connected with the cut feeder line is stored; assuming that the bus 101 is faulty, the circuit breaker S1 is opened, the serial numbers of the sides corresponding to the loads carried by the communication elements S2 and S3 are saved, the load is applied to S2 in the manner of (8,7,6,5), and S3 in the manner of (12,10, 11);
C. and optimizing the load power supply restoration of the power distribution network to obtain the load loading mode of each contact element after restoration:
constructing a CSP model satisfying the problem of power distribution network constraint, wherein the CSP model is described as a tripleP=（X,D,C）。XAre sets of variables, denoted herein as S2 and S3;Dis composed ofXThe cartesian product of the domain of each element in (a),D i is shown asiEach mode is represented by a load tree which takes a switch as a node and a load as an edge;Cto be a constraint set, the power restoration scheme must satisfy the constraintsCThe distribution network load recovery must satisfy the following constraints:
(1) the node voltage is in an allowable range;
(2) the load of the communication element does not exceed the rated value;
(3) operating in a network radiation mode;
the constraints (1) and (2) are checked and satisfied within the domain of the variables, the constraint (3) being equivalent to each load being supplied by one interconnection element, i.e. the loads loaded by any two interconnection elements do not have the same element, using the matrix shown belowR ij To represent the constraint relationship between two contact elements:
wherein the communication elementiIn a manner of loadingmSeed, communication elementjIn a manner of loadingnSeed, elementiTo (1) apLoad-applying mode and elementjTo (1) aqFetching when there is no same element in the load loading modea pq Is 1, and takes the value of 0 when the same element is contained;
R ij the matrix elements in the matrix can not be randomly arranged, all load-loading modes in each connection element are arranged from large to small according to a target function, and the matrix elements are numbered according to the sequence to obtain a constraint matrix; considering the objective function to reduce the power failure economic loss to the maximum, that is, the total power failure loss cost corresponding to the loaded load is the maximum, the formula is:
wherein,N i to communicate the componentiThe number of loads loaded;k b is as followsbThe unit power failure economic loss cost corresponding to each load is sensitive load although the unit power failure economic loss cost is not large for some sensitive users, and the power failure can also cause large influence, at this time, the orderk*k b Instead of the formerk b ，kTaking 3-5;p b is as followsbSize of individual loadReflected in current;
in fig. 3, in the case where the feeder capacity is 300A while the loaded feeder load is limited to be greater than 200A, the domain of S2 is { (8,7,6,5,4), (8,7,5,4,3), (8,7,5,4), (8,7,6,5) }, and the domain of S3 is { (12,10,9,3,2), (12,10,9,3,4), (12,10,11,9), (12,10,9,3), (12,10,9), (12,10,11) }, which have been arranged from large to small according to the objective function, and the constraint matrices between S2 and S3 are generated in this order:
after the constraint satisfaction problem model is established, searching for an optimal solution is needed, searching is carried out by adopting a dynamic asynchronous backtracking algorithm, a power supply recovery scheme which meets constraint conditions and enables the power failure loss corresponding to the load loaded by the total contact element to be maximum (namely, the reduced power failure loss cost is minimum) is found out, and the optimized mode of loading the load by the contact element is obtained; such asR 23 The elements in the first row and the first column meet the requirements and all adopt the maximum loading mode of the communication element, the loading mode adopted by S2 is (8,7,6,5,4), and the loading mode adopted by S3 is (12,10,9,3, 2);
D. obtaining a switching operation sequence in the power supply recovery process by comparing the change of the load loading modes of the communication elements before and after power supply recovery of the power distribution network;
the specific steps for generating the operation sequence of the power supply recovery switch are as follows:
the first step is as follows: from the set of variablesXTaking out one element, and placing the serial number of the edge corresponding to the load loaded by the communication element before the power supply is recovered into a queueF B In the method, after the power supply is recovered, the serial number of the side corresponding to the load loaded by the communication element is put into a queueF A Comparing the load tree with the feeder load removed from the load tree, and corresponding the feeder load to the load treeThe sequence number of the edge of (1) is put into a queueF in In the method, the serial numbers of the edges corresponding to the feeder loads cut from the load tree are put into a queueF out Performing the following steps; for theXThe middle element of the group of elements S2,F B is (8,7,6,5),F A to (8,7,6,5,4), sequence number 4 is placed in the queueF in Performing the following steps;
the second step is that: to queueF in AndF out the elements in (1) are classified according to the connection mode ifF in （F out ) If the middle element has no adjacent relation with any other element in the queue, the element is put into the queueF in1 （F out1 ) In the method, other elements with adjacency relation are divided into different load strings and each load string is regarded as a whole and put into a queueF in2 （F out2 ) In, there is no adjacency between different load strings; will be provided withF in1 AndF in2 the elements in the system are arranged in respective queues according to the cost of the power failure economic loss from large to small,F out1 andF out2 the elements in the queue are arranged in respective queues from small to large according to the economic loss cost of power failure;
the switch operation sequence is carried out according to the principle that the load is cut off first and then connected, the load is simple first and then complex, and the important load is connected first and then disconnected, so that the queue is cut off first and thenF out1 AndF out2 then accessing the corresponding loadF in1 AndF in2 the corresponding load in (1);
the third step: for theF out1 The load to be cut off, one element is taken out, and the side adjacent to the load is foundF B The switch serial number between the two sides is put into a disconnecting switch queue S;
the fourth step: repeating the third step untilF out1 Is empty;
the fifth step: for theF out2 In the load string, find the load string adjacent to the sideF B The switch serial numbers between the edges are put into a disconnecting switch queue S;
and a sixth step: repeating the fifth step untilF out2 Is empty;
the seventh step:F in1 andF in2 the elements in the sequence and the method from the third step to the sixth step are used for placing the serial number of the switch to be closed into a closed switch queue T and simultaneously dividingTOther peripheral switches of the element except the middle switch in a closed state are placed in an open switch queue S; generating queuesSIs a compound of (4),Tis (6);
thus, an open switch queue S and a closed switch queue T based on the communication element can be generated, and the switch state is kept unchanged if the switch state is in a required state before the operation during the switch operation;
eighth step: if it isXIf not, returning to the first step.
Continue to collect variable setsXElement S3 operation, generate queueSIs (2,12,4),Tthat is, (11) since the switch 4 is turned off in the operation of S2, the 4-switch state is maintained in the current operation, that is, the serial number of the switch to be turned off is deleted, andSis (2, 12);
the above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (3)
1. A method for generating a power supply recovery and switch operation sequence of a bus voltage loss fault is characterized by comprising the following steps: the power supply restoration method comprises the following steps of taking reduction of power failure economic loss maximization as an objective function, presenting a power distribution network reconstruction result in a mode of change of a load loading mode of an interconnection element, and generating a switching operation sequence on the basis of the change of the load loading mode of the interconnection element before and after power supply restoration:
A. reading network parameters of the power distribution network:
the power distribution network simplification model is adopted, namely the power distribution network is regarded as a graph and a power distribution lineThe feeder switches along the line are regarded as the vertexes of the graph, the feeder between the two vertexes is regarded as the edge of the graph, for simple calculation, three-phase unbalance factors are ignored, the voltage on the power distribution network is assumed to be equal everywhere, the line load is reflected by the current representing the phase, and a data structure representing the network parameters of the power distribution network is established, namely, the data structure defining the network parameters of the power distribution network is definedNMatrix of rows and 8 columnsDNamely:
wherein,d i1 number of the described edge, whereini=1,2,...N，NDescribed as the total number of edges;d i2 ~d i4 describing the serial number of the node connected with the edge, wherein the edge is connected with three nodes when T is connected;d i5 ~d i7 the side corresponding to the T-junction is adjacent to three sides,d i8 representing the load magnitude of the side, expressed in terms of the current representing the phase;Dthe idle elements in the matrix are all-1;
B. and (3) judging and isolating faults when the bus is in voltage loss, and storing the load loading mode of each communication element after fault isolation:
if the voltage of a certain bus is reduced to be approximately 0 from a normal value, and the current of a source point connected with the bus or the voltage and the current of a primary switch of a corresponding distribution line are reduced to be approximately 0 from the normal value, the bus is judged to be under voltage loss, and the number of the source points can be 2-5 generally; when a bus fails, the power distribution network automatically cuts off a source point breaker connected with the bus to isolate the fault, and simultaneously stores information of loads loaded by other contact elements connected with the cut feeder;
C. and optimizing the load power supply restoration of the power distribution network to obtain the load loading mode of each contact element after restoration:
constructing a CSP model satisfying the problem of power distribution network constraint, wherein the CSP model is described as a tripleP=（X,D,C），XIs a set of variables, denoted herein as a set of communicating elements;Dis composed ofXOf the domain of each variable inThe product of the cartesian dimension of the signal,D i is shown asiEach mode is represented by a load tree which takes a switch as a node and a load as an edge;Cto be a constraint set, the power restoration scheme must satisfy the constraintsCThe power restoration of the distribution network must satisfy the following constraints:
(1) the node voltage is in an allowable range;
(2) the load of the communication element does not exceed the rated value;
(3) operating in a network radiation mode;
the constraints (1) and (2) are checked and satisfied within the domain of the variables, the constraint (3) being equivalent to each load being supplied by one interconnection element, i.e. the loads loaded by any two interconnection elements do not have the same element, using the matrix shown belowR ij To represent the constraint relationship between two contact elements:
wherein the communication elementiIn a manner of loadingmSeed, communication elementjIn a manner of loadingnSeed, communication elementiTo (1) apLoad-carrying mode and communication elementjTo (1) aqFetching when there is no same element in the load loading modea pq Is 1, and takes the value of 0 when the same element is contained;
R ij the matrix elements in the matrix can not be randomly arranged, all load-loading modes in each connection element are arranged from large to small according to a target function, and the matrix elements are numbered to obtain a constraint matrix; considering the objective function to reduce the power failure economic loss to the maximum, that is, the total power failure loss cost corresponding to the loaded load is the maximum, the formula is:
wherein,N i to communicate the componentiThe number of loads loaded;k b is as followsbThe unit power failure economic loss cost corresponding to each load is sensitive load although the unit power failure economic loss cost is not large for some sensitive users, and the power failure can also cause large influence, at this time, the orderk×k b Instead of the formerk b ，kTaking 3-5;p b is as followsbThe size of each load is reflected by current;
after the CSP model with the constraint satisfaction problem is established, searching for an optimal solution is needed, a backtracking algorithm is adopted for searching, a power supply recovery scheme which meets the constraint condition and enables the power failure economic loss corresponding to the load loaded by the total contact element to be maximum is found, and the optimized mode of loading the load by the contact element is obtained;
D. obtaining a switching operation sequence in the power supply recovery process by comparing the change of the load loading modes of the communication elements before and after power supply recovery of the power distribution network; the switching operation sequence of the power supply recovery process comprises the following specific steps:
the first step is as follows: from the set of variablesXTaking out a connection element, and placing the serial number of the edge corresponding to the load loaded by the connection element before the power supply is recovered into a queueF B In the method, after the power supply is recovered, the serial number of the side corresponding to the load loaded by the communication element is put into a queueF A Comparison of middle and topF B AndF A obtaining the load tree carried by the newly accessed connection element after the power supply is recovered and the feeder load cut from the load tree, and placing the serial number of the edge corresponding to the feeder load of the newly accessed load tree into a queueF in In the method, the serial numbers of the edges corresponding to the feeder loads cut from the load tree are put into a queueF out Performing the following steps;
the second step is that: to queueF in AndF out the elements in (1) are classified according to the connection mode ifF in /F out If the middle element has no adjacent relation with any other element in the queue, the element is put into the queueF in1 /F out1 Performing the following steps; dividing other elements with adjacency relation into different load strings, and putting each load string into a queue as a wholeF in2 /F out2 In, there is no adjacency between different load strings; will be provided withF in1 AndF in2 the elements in the system are arranged in respective queues according to the cost of the power failure economic loss from large to small,F out1 andF out2 the elements in the queue are arranged in respective queues from small to large according to the economic loss cost of power failure;
the switch operation sequence is carried out according to the principle that the load is cut off first and then the load is connected, the operation is simple first and then complex, and the important load is connected first and then cut off, so that the queue is cut off sequentially firstF out1 AndF out2 then accessing the corresponding loadF in1 AndF in2 the corresponding load in (1);
the third step: for theF out1 The load to be cut off, one element is taken out, and the side adjacent to the load is foundF B The switch serial number between the two sides is put into a disconnecting switch queue S;
the fourth step: repeating the third step untilF out1 Is empty;
the fifth step: for theF out2 In the load string, find the load string adjacent to the sideF B The switch serial numbers between the edges are put into a disconnecting switch queue S;
and a sixth step: repeating the fifth step untilF out2 Is empty;
the seventh step:F in1 andF in2 the elements in the sequence and the method from the third step to the sixth step are used for putting the serial number of the switch to be closed into a closed switch queueTIn, will remove the closed switch queue at the same timeTPutting other peripheral switch serial numbers in the closed state of the element except the middle switch serial number into the disconnection switch queueSPerforming the following steps;
this allows the creation of a queue of disconnect switches based on the contact elementSAnd closing the switch queueTWhen the switch is operated, if the switch state is in the required state before the operation, the switch state is kept unchanged;
eighth step: if it isXIf not, returning to the first step.
2. The method for bus voltage loss fault power supply restoration and switching operation sequence generation according to claim 1, characterized in that: in step "D", the switching sequence should satisfy the following requirements:
⑴ operation process keeps network radiation mode operation;
⑵ no overload is generated during operation;
⑶ should be able to recover as quickly as possible during operation to supply power to the load with the economic loss of power.
3. The method for bus voltage loss fault power supply restoration and switching operation sequence generation according to claim 1, characterized in that: the communication element is a normally-operated element capable of loading a fault area load.
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