CN113783185A - Method for quickly reconstructing power distribution network - Google Patents
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Abstract
The invention belongs to power system simulation, and relates to a method for quickly reconstructing a power distribution network. The method starts from the problems of heavy overload, low voltage and the like existing in the operation of the power distribution network, and adopts a forward and reverse topology analysis method to generate a supply-transfer scheme aiming at each problem device aiming at the feeder line of the power distribution network to which the problem device belongs; the transfer scheme relates to the condition of transferring a plurality of feeders in and out, and a plurality of network reconstruction subareas are generated according to the incidence relation of the feeders, wherein the reconstruction subareas are the minimum set of the transfer scheme which influences the load flow distribution; and recalculating each reconstruction zone load flow according to the transfer scheme to obtain the weighting indexes of the transfer scheme aiming at different types of problem equipment, and obtaining the optimal transfer scheme by comparing the basic state indexes with the weighting indexes of all the transfer schemes. The method efficiently finds all the transfer schemes by carrying out topology search on the specific problem equipment. And an optimal reconstruction strategy capable of improving the ground state index is reasonably given by adopting a weighting index optimization method.
Description
Technical Field
The invention belongs to the technical field of power system simulation, and particularly relates to a method for quickly reconstructing a power distribution network.
Background
Aiming at the problems of heavy overload of lines, low voltage of distribution transformer and the like in the operation of a power distribution network, a traditional dispatcher needs to invest a large amount of manpower and material resources in searching the reason of the problems and analyzing a transfer scheme, and under the conditions that the scale of the power distribution network is larger and the number of hand-in-hand operation modes is larger and larger, the work of searching the transfer scheme for solving the problems and comparing the safety of various transfer schemes is increasingly difficult.
Disclosure of Invention
The invention aims to provide a method for quickly reconstructing a power distribution network so as to overcome the defects in the prior art.
The invention provides a method for quickly reconstructing a power distribution network, which comprises the following steps:
(1) reading problem equipment information in the power distribution network, and storing the problem equipment information in a problem equipment list;
(2) reading a power distribution network equipment model, wherein the power distribution network equipment model comprises but is not limited to equipment node information, double-ended equipment information and single-ended equipment information, simplifying the power distribution network model into nodes, single-ended equipment and double-ended equipment, storing the single-ended equipment in an equipment list associated with one node according to equipment node numbers, and storing the double-ended equipment in an equipment list associated with two nodes;
(3) reading remote signaling states of a circuit breaker and a disconnecting link device in a power distribution network, and storing the circuit breaker and the disconnecting link which are disconnected in the remote signaling states in a disconnection switch list;
(4) according to the type of the power distribution network nodes, the high-voltage side main transformer bus root nodes are sequentially stored in an unsearched node list, and a feeder line is created for each high-voltage side main transformer bus root node; judging the unsearched node list, if the unsearched node list is empty, jumping to the step (5), and if the unsearched node list is not empty, acquiring a first root node from the unsearched node list;
(5) starting from the forward direction of the unsearched node list, performing topology search, adopting breadth-first search logic according to the association relationship between the power distribution network equipment and the nodes, sequentially acquiring sub-nodes, node-associated single-ended equipment and node-associated double-ended equipment, setting the feeder lines to which the corresponding equipment belongs as the feeder lines of the current nodes until the tail end of a power grid or the switching equipment with a disconnected remote signaling state is searched, and recording the traversed nodes, the single-ended equipment and the double-ended equipment as a charged state;
(6) obtaining a feeder line to which a problem device association node belongs according to the device name in the problem device list, searching a transfer scheme according to the device name in the problem device list, storing the transfer scheme in a transfer scheme list, judging the problem device list, jumping to the step (7) if the problem device list is empty, and taking out a first problem device in the problem device list if the problem device list is not empty;
(7) traversing the problem device transfer scheme list, establishing a network reconstruction partition by taking the feeder line of the disconnecting switch and the feeder line of the closing switch in the transfer scheme as a correlation, storing the transfer scheme containing the same feeder line in the same partition transfer scheme list, storing the feeder line contained in the transfer scheme in a partition feeder line list, and adding all partitions into a network reconstruction partition list;
(8) counting the ground state load rate index and the voltage index of the power distribution network before supply transfer, calculating the ground state final score of the power distribution network according to set index weights, judging the network reconstruction partition list, if the network reconstruction partition list is empty, jumping to the step (9), and if the network reconstruction partition list is not empty, taking out a first network reconstruction partition;
(9) sequentially operating and reconstructing action switches corresponding to all the transfer and supply schemes in the subarea, calculating the power flow of the feeder line of the subarea, counting load rate indexes and voltage indexes after transfer and supply, and calculating the final grading of all the transfer and supply schemes according to the set weight of all the indexes;
(10) and comparing the ground state of the power distribution network with the reconstructed average load rate of the line, the maximum load rate of the line, the distribution transformer average per unit voltage and the distribution transformer minimum per unit voltage, grading each power transfer scheme, screening the optimal power transfer scheme of the network reconstruction subarea, and completing the network reconstruction of the power distribution network.
The method for rapidly reconstructing the power distribution network provided by the invention has the following advantages:
starting from the devices with problems in the operation of the power distribution network, the method adopts a topology analysis method aiming at the feeder line of the power distribution network to which the devices with problems belong, and generates a transfer scheme aiming at each device with problems by carrying out topology search on the specific devices with problems; by carrying out partition combination on the feeder line and the transfer feeder line of the equipment with specific problems, the index of the partition feeder line is efficiently calculated, and the optimal reconstruction strategy of the power distribution network capable of improving the ground state index is reasonably provided by adopting a weighted index optimization method. The method of the invention includes but is not limited to providing a problem equipment transfer scheme, and can be expanded to the analysis and the preference of the transfer scheme of any equipment.
Additional aspects and advantages of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a block diagram of a fast reconfiguration process of a power distribution network according to an embodiment of the method of the present invention.
FIG. 2 is a flowchart of the topology searching of step (5) in one embodiment of the method.
Fig. 3 is a flow chart of the network reconfiguration partition index calculation in step (9) according to an embodiment of the method.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic flow chart diagram illustrating a method for fast reconfiguration of a power distribution network according to an embodiment of the present invention. The method for rapidly reconstructing the power distribution network in the embodiment can be applied to user equipment such as a mobile phone and a tablet personal computer.
An embodiment of the method for quickly reconstructing a power distribution network according to the present invention is described in detail below with reference to fig. 1, and may include the following steps:
in one embodiment of the method, firstly, a problem equipment list is constructed and used for storing problem equipment in a power distribution network; constructing a disconnection switch list for storing remote signaling disconnected switch equipment in the power distribution network; constructing an unsearched node list for temporarily storing nodes to be searched in the topology searching process; constructing a network reconstruction partition list for storing network reconstruction partitions constructed according to the topology search result; constructing a network reconstruction partition feeder line list for storing feeder lines contained in the network reconstruction partition; and constructing a network reconstruction partition transfer scheme list for storing the transfer schemes contained in the network reconstruction partition.
According to one embodiment of the method of the invention:
in step 1, reading problem equipment information such as heavy overload lines, low voltage distribution transformers and the like in the power distribution network from a power distribution network load flow calculation result or other platform systems, wherein the problem equipment information comprises equipment numbers, equipment names, fault types and equipment types, storing the problem equipment information in a problem equipment list, and performing topology search;
in step 2, a distribution network equipment model is read from a database or other platform system, the distribution network equipment model including, but not limited to, equipment node information (mainly including node number, node name, node type information), double-ended equipment information (mainly including equipment number, equipment name, equipment type, belonging feeder, node one number, node two number), such as line segment, breaker, knife switch, distribution transformer winding, and single-ended equipment information (mainly including equipment number, equipment name, equipment type, belonging feeder, node one number), such as load, distributed power supply, capacitive reactor, wherein single-ended equipment associates a single equipment node and double-ended equipment associates two equipment nodes, the grid model is reduced to node, single-ended equipment and double-ended equipment, single-ended equipment is added to the equipment list of its associated nodes according to the equipment node number, respectively adding the double-end equipment to the equipment lists of the two nodes related to the double-end equipment, and generating a related node equipment list for each node;
in step 3, reading and reading remote signaling states (mainly including switch numbers, switch names, and switch open or close state information) of the circuit breakers and the knife switch devices in the power distribution network from a database or other platform systems, and storing the circuit breakers and the knife switches in the remote signaling states in the open switch list, wherein the remote signaling states are mainly used for stopping searching when the circuit breakers and the knife switch devices in the remote signaling states are disconnected during topology searching.
In step 4, according to the type of the nodes of the power distribution network, sequentially adding the root nodes of the main transformer buses at the high-voltage side into the unsearched node list, and creating a feeder line (for representing a container which covers a plurality of nodes, a plurality of single-ended devices and a plurality of double-ended devices) for each root node of the main transformer buses at the high-voltage side; judging the unsearched node list, if the unsearched node list is empty, ending the step, and if the unsearched node list is not empty, acquiring a first root node from the unsearched node list, wherein the steps are as follows:
(1) creating a new feeder line, setting the current root node to belong to the feeder line, and setting the current root node to be in a charged state;
(2) and (3) judging the current root node, if the current root node is not the last node of the unsearched node list, acquiring the next root node from the unsearched node list, returning to the step (1), and if the current root node is the last node of the unsearched node list, ending the step.
In step 5, topology searching is performed from the forward direction of the unsearched node list, a topology searching flowchart is shown in fig. 2, according to the association relationship between the devices and the nodes, breadth-first searching logic is adopted, the sub-nodes, the node-associated single-ended devices and the node-associated double-ended devices are sequentially obtained, the feeder lines to which the sub-nodes, the node-associated single-ended devices and the node-associated double-ended devices belong are set as the feeder lines of the current nodes, and the traversed nodes, the single-ended devices and the double-ended devices are marked as the charged states until the tail end of the power grid or the switching device in the remote signaling state is searched. The flow chart of step 5 is shown in fig. 2, and the specific process is as follows:
(1) judging the unsearched node list, if the unsearched node list is empty, jumping to the step (5), if the unsearched node list is not empty, enabling the length of the unsearched node list to be NS, and enabling the serial number of the searched node to be 1 during initialization;
(2) setting a node at the searching node counting position of the unsearched node list as a current node, enabling a feeder line to which the current node belongs to be a current feeder line, judging a node equipment list of the current node, if the node equipment list of the current node is empty, jumping to the step (3), and if the node equipment list of the current node is not empty, traversing the node equipment list of the current node, wherein the specific steps are as follows:
(2-1) acquiring first node equipment in a node equipment list of a current node, and setting the node equipment as the current node equipment;
(2-2) judging the current node equipment, if the current node equipment is traversed, jumping to the step (2-6), and if the current node equipment is not traversed, performing the step (2-3);
(2-3) marking that the current node equipment belongs to the current feeder line and marking that the current node equipment traverses;
(2-4) judging the type of the current node equipment, if the type of the current node equipment is single-ended equipment, skipping to the step (2-6), and if the type of the current node equipment is double-ended equipment, acquiring an opposite end node of the double-ended equipment from two associated nodes of the double-ended equipment, and performing the step (2-5);
(2-5) judging the opposite end node, if the opposite end node is traversed, jumping to the step (2-6), if the opposite end node is not traversed, marking the opposite end node as the current feeder line, marking the opposite end node as traversed, marking the opposite end node as a charged state, marking the father node of the opposite end node as the current node, adding the opposite end node into an unsearched node list, and performing the step (2-6);
(2-6) judging the node equipment list of the current node, if the current node equipment is not the last equipment in the node equipment list of the current node, acquiring the next equipment in the node equipment list of the current node, setting the equipment as the current node equipment, returning to the step (2-2), and if the current node equipment is the last equipment in the node equipment list of the current node, continuing to the step (3);
(3) judging the searching node serial number, if the searching node serial number is smaller than the unsearched node list length NS, adding 1 to the searching node serial number count, returning to the step (2), and if the searching node serial number is equal to NS, performing the step (4);
(4) removing the former NS traversed nodes from the unsearched node list, and returning to the step (1);
(5) and if the unsearched node list is empty, the forward topology searching is finished, and the step is finished.
In step 6, a feeder line to which the problem device association node belongs is obtained according to the device name in the problem device list, a transfer scheme of the problem device is searched according to the device name in the problem device list, the transfer scheme is stored in a transfer scheme list, the problem device list is judged, if the problem device list is empty, the step is completed, and if the problem device list is not empty, a first problem device in the problem device list is taken out. The method comprises the following specific steps:
(1) obtaining a feeder line to which the current problem equipment belongs according to the forward topology searching result, judging the disconnection switch list, jumping to the step (7) if the disconnection switch list is empty, and taking out a first switch in the disconnection switch list to perform the step (2) if the disconnection switch list is not empty;
(2) acquiring a head end node and a tail end node of a current disconnecting switch;
(3) judging the electrified states of the head end node and the tail end node, if the head end node or the tail end node is a power-off node, jumping to the step (6), and if the head end node and the tail end node are both electrified nodes, performing the step (4);
(4) judging feeders to which the head end node and the tail end node belong, if one of the head end node and the tail end node and only one of the feeders to which the node belongs are the same as the feeder to which the problem equipment belongs, judging that the current disconnecting switch can transfer the current node equipment to another feeder, and performing the step (5), if none of the feeders to which the node belongs in the head end node and the tail end node is the same as the feeder to which the problem equipment belongs or the feeders to which the head end node and the tail end node belong are the same as the feeders to which the problem equipment belongs, jumping to the step (6);
(5) according to the topology searching result in the step (5), obtaining a common father node of the feeder node of the current problem device connected with the current disconnecting switch and the current problem device, and searching a closest closing switch on an upstream power supply path according to the common father node; if the closed switch cannot be found, the current open switch cannot provide a transfer scheme for the current problem equipment, if the closed switch is found, the current open switch and the current closed switch form a transfer scheme for the current problem equipment, and the transfer scheme is added into a transfer scheme list of the current problem equipment;
(6) judging the disconnection switch list, if the current disconnection switch is not the last switch in the disconnection switch list, obtaining the next disconnection switch in the disconnection switch list from the disconnection switch list, returning to the step (2), and if the current disconnection switch is the last switch in the disconnection switch list, performing the step (7);
(7) and (4) judging the problem equipment list, if the current problem equipment is not the last equipment in the problem equipment list, acquiring the next problem equipment in the problem equipment list, returning to the step (1), and if the current problem equipment is the last equipment in the problem equipment list, finishing the step.
In step 8, counting the base state load rate index and the voltage index before supply, calculating the base state final score according to the set weight of each index, judging the network reconstruction partition list, if the network reconstruction partition list is empty, jumping to step (9), and if the network reconstruction partition list is not empty, taking out the first network reconstruction partition, wherein the specific steps are as follows:
(1) acquiring a network reconstruction partition feeder line list from a current network reconstruction partition;
(2) acquiring all lines and distribution transformers of the feeder lines in the network reconstruction partition feeder line list according to the feeder line to which the equipment marked in the step (5) belongs, and counting the average load rate of the ground state lines, the maximum load rate of the ground state lines, the average voltage of the ground state distribution transformers and the minimum voltage of the ground state distribution transformers according to the ground state power flow result;
(3) calculating a line load rate score, setting the load rate of a power distribution network line to be generally lower than 40% as light load and higher than 80% as heavy load, setting the average load rate to represent the overall average level of the load, setting the maximum load rate to represent the extreme severe load condition of the load, setting the lower limit of a reasonable range of the load rate to be 0.4, setting the upper limit of the reasonable range of the load rate to be 0.8, setting the grading gradient within a reasonable interval to be 0.8, and setting the grading gradient outside the reasonable range to be 1.2;
(4) calculating a distribution transformation voltage score, setting a reasonable voltage fluctuation range of the power distribution network equipment to be +/-7%, the average voltage represents the overall average level of the voltage, the lowest voltage represents the extreme condition of severe voltage, the lower limit of the reasonable voltage range is 0.93p.u., the upper limit of the reasonable voltage range is 1.07p.u., the score gradient in a reasonable interval is 0.8, and the score gradient outside the reasonable range is 1.2;
in one embodiment of the method of the present invention, the scoring method for each index is as follows: considering that the overload risk exists when the load rate of a power distribution network line is too high, the resource waste possibly exists when the load rate is too low, the safety risk exists when the distribution network distribution transformation voltage overvoltage and low voltage exists, a certain reasonable range exists between the load rate of the line and the per-unit value of the distribution transformation voltage, a reasonable range percentage type index is to be constructed, a segmented continuous scoring method is constructed by taking the corresponding gradients of the reasonable range and different ranges as parameters, the midpoint of the reasonable range is set as the maximum value of the percentage type index 1.0, the score in the reasonable range is reduced towards two sides of the midpoint by a small gradient, the score outside the reasonable range is reduced towards two sides of the midpoint by a large gradient, the input index is set as x, the lower limit of the reasonable range is min, the upper limit of the reasonable range is max, the gradient in the reasonable range is r1, the gradient outside the reasonable range is r2, and the midpoint of the reasonable range is (min + max)/2, specific scores are defined as follows:
score 1- (mid-min) x r 1- (min-x) x r2 when x < min;
scoring score 1- | x-mid | × r1 when min ≦ x ≦ max;
score 1- (mid-min) x r 1- (x-max) x r2 when max < x;
(5) respectively setting a line load rate scoring weight and a distribution transformer voltage scoring weight, and calculating in a weighting mode to obtain a current network reconstruction partition ground state comprehensive score: the ground state line load rate score is multiplied by the line load rate score weight, the ground state voltage score is multiplied by the distribution voltage score weight;
(6) and (4) judging the network reconstruction partition list, taking out the next network reconstruction partition if the current network reconstruction partition is not the last network reconstruction partition list, returning to the step (8-1), and finishing the step if the current network reconstruction partition is the last network reconstruction partition list.
In step 9, operating the action switches of each transfer scheme in the reconstruction partition in sequence, calculating the power flow of the feeder line of the partition, counting the load rate index and the voltage index after transfer, and calculating the final score of each transfer scheme according to the set weight of each index, wherein the calculation flow chart of the index of the network reconstruction partition is shown in fig. 3, and the specific steps are as follows:
(1) judging the network reconstruction partition list, if the network reconstruction partition list is empty, ending the step, and if the network reconstruction partition list is not empty, taking out a first network reconstruction partition;
(2) taking out the network reconstruction partition transfer scheme list from the current network reconstruction partition, judging the transfer scheme list, if the current partition transfer scheme list is empty, skipping to the step (3), if the current partition transfer scheme list is not empty, calculating the index score of the current network reconstruction partition transfer scheme, and the concrete steps are as follows:
(2-1) taking out a first transfer scheme of the current network reconstruction partition;
(2-2) closing an open switch of the current transfer scheme, opening a closed switch of the current transfer scheme, and calculating the current network reconstruction partition feeder flow;
(2-3) acquiring all lines and distribution transformers of the feeder lines in the network reconstruction partition feeder line list according to the feeder lines to which the equipment marked in the incidence relation of the power distribution network equipment and the nodes belongs, and counting the average load rate of the reconstructed lines, the maximum load rate of the reconstructed lines, the average voltage of the reconstructed distribution transformers and the minimum voltage of the reconstructed distribution transformers according to the load rate and the voltage of each line in the load flow calculation result of the step (2-2);
(2-4) calculating a line load rate score, setting the lower limit of a reasonable range of the load rate to be 0.4, the upper limit of the reasonable range of the load rate to be 0.8, the score gradient in a reasonable interval to be 0.8 and the score gradient outside the reasonable range to be 1.2, respectively calculating the average load rate score of the reconstructed line and the maximum load rate score of the reconstructed line by using the method of the embodiment of the invention, and taking the average value of the average load rate score of the reconstructed line and the maximum load rate score of the reconstructed line as the load rate score of the reconstructed line;
(2-5) calculating a distribution transformer voltage score, setting the lower limit of a reasonable voltage range to be 0.93p.u., the upper limit of the reasonable voltage range to be 1.07p.u., the score gradient in a reasonable interval to be 0.8 and the score gradient outside the reasonable range to be 1.2, respectively calculating a reconstructed distribution transformer average per unit voltage score and a reconstructed distribution transformer lowest per unit voltage score by using the method in the step 8 in the embodiment of the invention, and taking the average of the reconstructed distribution transformer average per unit voltage score and the reconstructed distribution transformer lowest per unit voltage score as the reconstructed voltage score;
(2-6) calculating the reconstruction comprehensive score of the current network reconstruction subarea current transfer scheme in a weighting mode by adopting the line load rate scoring weight and the distribution voltage scoring weight which are consistent with the ground state: the line load rate score after reconstruction is multiplied by the line load rate score weight, and the voltage score after reconstruction is multiplied by the distribution voltage score weight;
(2-7) restoring the open switch of the current transfer scheme in the step (2-2) to be in an open state, and restoring the closed switch of the current transfer scheme in the step (2-2) to be in a closed state;
(2-8) judging the network reconstruction partition transfer scheme list, if the current transfer scheme is not the last network reconstruction partition transfer scheme list, taking out the next transfer scheme and repeating the step (2-1), and if the current transfer scheme is the last network reconstruction partition transfer scheme list, continuing to execute the step (3);
(3) and (3) judging the network reconstruction partition list, if the current network reconstruction partition is not the last network reconstruction partition list, taking out the next network reconstruction partition and returning to the step (1), and if the current network reconstruction partition is the last network reconstruction partition list, ending the step.
In step 10, indexes and scores of all the transfer schemes in the network reconstruction partition list are calculated, the transfer schemes are compared and scored by comparing the ground state with the reconstructed average load rate of the line, the maximum load rate of the line, the distribution transformation average per unit voltage and the lowest per unit voltage of the distribution transformation, the optimal transfer scheme of the network reconstruction partition is screened out, and the network reconstruction is completed, and the specific steps are as follows:
(1) screening a transfer scheme meeting the condition of lifting the ground state index from the network reconstruction partition, wherein the condition of lifting the ground state index comprises the following steps: the reconstructed line average load rate is smaller than the ground state line average load rate, the reconstructed line maximum load rate is smaller than the ground state line maximum load rate, the reconstructed distribution transformation average per unit voltage is larger than the ground state distribution transformation average per unit voltage, and the reconstructed distribution transformation minimum per unit voltage is larger than the ground state distribution transformation minimum per unit voltage;
(2) selecting a transfer scheme with the highest reconstruction comprehensive score from the transfer schemes for improving the ground state index as an optimal transfer scheme of the corresponding network reconstruction partition;
(3) and forming the optimal power transfer schemes of all the network reconstruction partitions into a complete power transfer scheme, and finishing the rapid reconstruction of the power distribution network based on the weighting index optimization.
The foregoing is a preferred embodiment of the present disclosure that can be understood and carried out by those of ordinary skill in the art without inventive effort. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (8)
1. A method for quickly reconstructing a power distribution network is characterized by comprising the following steps:
(1) reading problem equipment information in the power distribution network;
(2) reading a power distribution network equipment model;
(3) reading remote signaling states of a circuit breaker and a disconnecting link device in the power distribution network;
(4) according to the type of the power distribution network nodes, the high-voltage side main transformer bus root nodes are sequentially stored in an unsearched node list, and a feeder line is created for each high-voltage side main transformer bus root node;
(5) starting from the forward direction of the unsearched node list, performing topology search, setting the feeder line to which the corresponding equipment belongs as the feeder line to which the current node belongs, and searching to the tail end of the power grid or the switching equipment of which the remote signaling state is disconnected;
(6) searching a problem equipment transfer scheme;
(7) traversing the problem device transfer scheme list, establishing a network reconstruction partition by taking the feeder line of the disconnecting switch and the feeder line of the closing switch in the transfer scheme as a correlation, storing the transfer scheme containing the same feeder line in the same partition transfer scheme list, storing the feeder line contained in the transfer scheme in a partition feeder line list, and adding all partitions into a network reconstruction partition list;
(8) counting the ground state load rate index and the voltage index of the power distribution network before supply transfer, calculating the ground state final score of the power distribution network according to set index weights, judging the network reconstruction partition list, if the network reconstruction partition list is empty, jumping to the step (9), and if the network reconstruction partition list is not empty, taking out a first network reconstruction partition;
(9) sequentially operating and reconstructing action switches corresponding to all the transfer and supply schemes in the subarea, calculating the power flow of the feeder line of the subarea, counting load rate indexes and voltage indexes after transfer and supply, and calculating the final grading of all the transfer and supply schemes according to the set weight of all the indexes;
(10) and comparing the ground state of the power distribution network with the reconstructed average load rate of the line, the maximum load rate of the line, the distribution transformer average per unit voltage and the distribution transformer minimum per unit voltage, grading each power transfer scheme, screening the optimal power transfer scheme of the network reconstruction subarea, and completing the network reconstruction of the power distribution network.
2. The method for rapidly reconstructing the power distribution network according to claim 1, wherein the step (4) comprises:
(1) creating a new feeder line, setting the current root node to belong to the feeder line, and setting the current root node to be in a charged state;
(2) and (3) judging the current root node, if the current root node is not the last node of the unsearched node list, acquiring the next root node from the unsearched node list, repeating the step (1), and if the current root node is the last node of the unsearched node list, finishing the step.
3. The method for rapidly reconstructing the power distribution network according to claim 1, wherein the step (5) comprises:
(1) judging the unsearched node list, if the unsearched node list is empty, jumping to the step (5), if the unsearched node list is not empty, enabling the length of the unsearched node list to be NS, and enabling the serial number of the searched node to be 1 during initialization;
(2) setting a node at the searching node counting position of the unsearched node list as a current node, enabling a feeder line to which the current node belongs to be a current feeder line, judging a node equipment list of the current node, if the node equipment list of the current node is empty, jumping to the step (3), and if the node equipment list of the current node is not empty, traversing the node equipment list of the current node, wherein the specific steps are as follows:
(2-1) acquiring first node equipment in a node equipment list of a current node, and setting the node equipment as the current node equipment;
(2-2) judging the current node equipment, if the current node equipment is traversed, jumping to the step (2-6), and if the current node equipment is not traversed, performing the step (2-3);
(2-3) marking that the current node equipment belongs to the current feeder line and marking that the current node equipment traverses;
(2-4) judging the type of the current node equipment, if the type of the current node equipment is single-ended equipment, skipping to the step (2-6), and if the type of the current node equipment is double-ended equipment, acquiring an opposite end node of the double-ended equipment from two associated nodes of the double-ended equipment, and performing the step (2-5);
(2-5) judging the opposite end node, if the opposite end node is traversed, jumping to the step (2-6), if the opposite end node is not traversed, marking the opposite end node as the current feeder line, marking the opposite end node as traversed, marking the opposite end node as a charged state, marking the father node of the opposite end node as the current node, adding the opposite end node into an unsearched node list, and performing the step (2-6);
(2-6) judging the node equipment list of the current node, if the current node equipment is not the last equipment in the node equipment list of the current node, acquiring the next equipment in the node equipment list of the current node, setting the equipment as the current node equipment, returning to the step (2-2), and if the current node equipment is the last equipment in the node equipment list of the current node, continuing to the step (3);
(3) judging the searching node serial number, if the searching node serial number is smaller than the unsearched node list length NS, adding 1 to the searching node serial number count, returning to the step (2), and if the searching node serial number is equal to NS, performing the step (4);
(4) removing the former NS traversed nodes from the unsearched node list, and returning to the step (1);
(5) and if the unsearched node list is empty, the forward topology searching is finished, and the step is finished.
4. The method for rapidly reconstructing power distribution network according to claim 1, wherein the step (6) comprises:
(1) obtaining a feeder line to which the current problem equipment belongs according to the forward topology searching result, judging the disconnection switch list, jumping to the step (7) if the disconnection switch list is empty, and taking out a first switch in the disconnection switch list to perform the step (2) if the disconnection switch list is not empty;
(2) acquiring a head end node and a tail end node of a current disconnecting switch;
(3) judging the electrified states of the head end node and the tail end node, if the head end node or the tail end node is a power-off node, jumping to the step (6), and if the head end node and the tail end node are both electrified nodes, performing the step (4);
(4) judging feeders to which the head end node and the tail end node belong, if one of the head end node and the tail end node and only one of the feeders to which the node belongs are the same as the feeder to which the problem equipment belongs, judging that the current disconnecting switch can transfer the current node equipment to another feeder, and performing the step (5), if none of the feeders to which the node belongs in the head end node and the tail end node is the same as the feeder to which the problem equipment belongs or the feeders to which the head end node and the tail end node belong are the same as the feeders to which the problem equipment belongs, jumping to the step (6);
(5) according to the topology searching result in the step (5), obtaining a common father node of the feeder node of the current problem device connected with the current disconnecting switch and the current problem device, and searching a closest closing switch on an upstream power supply path according to the common father node; if the closed switch cannot be found, the current open switch cannot provide a transfer scheme for the current problem equipment, if the closed switch is found, the current open switch and the current closed switch form a transfer scheme for the current problem equipment, and the transfer scheme is added into a transfer scheme list of the current problem equipment;
(6) judging the disconnection switch list, if the current disconnection switch is not the last switch in the disconnection switch list, obtaining the next disconnection switch in the disconnection switch list from the disconnection switch list, returning to the step (2), and if the current disconnection switch is the last switch in the disconnection switch list, performing the step (7);
(7) and (4) judging the problem equipment list, if the current problem equipment is not the last equipment in the problem equipment list, acquiring the next problem equipment in the problem equipment list, returning to the step (1), and if the current problem equipment is the last equipment in the problem equipment list, finishing the step.
5. The method for rapidly reconstructing power distribution network according to claim 1, wherein the step (8) comprises:
(1) acquiring a network reconstruction partition feeder line list from a current network reconstruction partition;
(2) acquiring all lines and distribution transformers of the feeders in the network reconstruction partition feeder list according to feeders to which equipment marked by forward topology search of the unsearched node list belongs, and counting the average load rate of the ground state lines, the maximum load rate of the ground state lines, the average voltage of the ground state distribution transformers and the minimum voltage of the ground state distribution transformers according to the ground state power flow result;
(3) calculating a line load rate score, setting the load rate of a power distribution network line to be generally lower than 40% as a light load and higher than 80% as a heavy load, setting the average load rate to represent the integral average level of the load, setting the maximum load rate to represent the extreme severe load condition of the load, setting the lower limit of a reasonable range of the load rate to be 0.4, the upper limit of the reasonable range of the load rate to be 0.8, setting the grading gradient within a reasonable interval to be 0.8, setting the grading gradient outside the reasonable range to be 1.2, respectively calculating the average load rate score and the maximum load rate score of the ground state line, and setting the average value of the average load rate score and the maximum load rate score of the line as the load rate score of the ground state line;
(4) calculating a distribution transformation voltage score, setting a reasonable voltage fluctuation range of power distribution network equipment to be +/-7%, the average voltage represents the overall average level of the voltage, the lowest voltage represents the extreme condition of severe voltage, the lower limit of the reasonable voltage range is 0.93p.u., the upper limit of the reasonable voltage range is 1.07p.u., the score gradient in a reasonable interval is 0.8, the score gradient outside the reasonable range is 1.2, calculating a ground state distribution transformation average per unit voltage score and a distribution transformation lowest per unit voltage score respectively, and taking the mean value of the distribution transformation average per unit voltage score and the distribution transformation lowest per unit voltage score as the ground state voltage score;
(5) respectively setting a line load rate scoring weight and a distribution transformer voltage scoring weight, and calculating in a weighting mode to obtain a current network reconstruction partition ground state comprehensive score: the ground state line load rate score is multiplied by the line load rate score weight, the ground state voltage score is multiplied by the distribution voltage score weight;
(6) and (3) judging the network reconstruction partition list, if the current network reconstruction partition is not the last network reconstruction partition list, taking out the next network reconstruction partition, returning to the step (1), and if the current network reconstruction partition is the last network reconstruction partition list, finishing the step.
6. The method for fast reconstructing power distribution network as claimed in claim 1, wherein said step (9) comprises:
(1) judging the network reconstruction partition list, if the network reconstruction partition list is empty, performing network reconstruction, and if the network reconstruction partition list is not empty, taking out a first network reconstruction partition;
(2) taking out the network reconstruction partition transfer scheme list from the current network reconstruction partition, judging the transfer scheme list, if the current partition transfer scheme list is empty, skipping to the step (3), if the current partition transfer scheme list is not empty, calculating the index score of the current network reconstruction partition transfer scheme, and the concrete steps are as follows:
(2-1) taking out a first transfer scheme of the current network reconstruction partition;
(2-2) closing an open switch of the current transfer scheme, opening a closed switch of the current transfer scheme, and calculating the current network reconstruction partition feeder flow;
(2-3) acquiring all lines and distribution transformers of the feeder lines in the network reconstruction partition feeder line list according to the feeder line to which the equipment marked in the forward topology search of the unsearched node list belongs, and counting the average load rate of the reconstructed lines, the maximum load rate of the reconstructed lines, the average voltage of the reconstructed distribution transformers and the minimum voltage of the reconstructed distribution transformers according to the load rate and the distribution transformer voltage of each line in the load flow calculation result of the step (2-2);
(2-4) calculating a line load rate score, setting the lower limit of a reasonable range of the load rate to be 0.4, the upper limit of the reasonable range of the load rate to be 0.8, the score gradient in a reasonable interval to be 0.8 and the score gradient outside the reasonable range to be 1.2, respectively calculating a reconstructed line average load rate score and a reconstructed line maximum load rate score, and taking the average value of the reconstructed line average load rate score and the reconstructed line maximum load rate score as the reconstructed line load rate score;
(2-5) calculating a distribution transformer voltage score, setting the lower limit of a reasonable voltage range to be 0.93p.u., the upper limit of the reasonable voltage range to be 1.07p.u., the score gradient in a reasonable interval to be 0.8, and the score gradient outside the reasonable range to be 1.2, respectively calculating a reconstructed distribution transformer average per unit voltage score and a reconstructed distribution transformer lowest per unit voltage score, and taking the mean value of the reconstructed distribution transformer average per unit voltage score and the reconstructed distribution transformer lowest per unit voltage score as the reconstructed voltage score;
(2-6) calculating the reconstruction comprehensive score of the current network reconstruction subarea current transfer scheme in a weighting mode by adopting the line load rate scoring weight and the distribution voltage scoring weight which are consistent with the ground state: the line load rate score after reconstruction is multiplied by the line load rate score weight, and the voltage score after reconstruction is multiplied by the distribution voltage score weight;
(2-7) restoring the open switch of the current transfer scheme in the step (2-2) to be in an open state, and restoring the closed switch of the current transfer scheme in the step (2-2) to be in a closed state;
(2-8) judging the network reconstruction partition transfer scheme list, if the current transfer scheme is not the last network reconstruction partition transfer scheme list, taking out the next transfer scheme and repeating the step (2-1), and if the current transfer scheme is the last network reconstruction partition transfer scheme list, continuing to execute the step (3);
(3) and (3) judging the network reconstruction partition list, if the current network reconstruction partition is not the last network reconstruction partition list, taking out the next network reconstruction partition and returning to the step (1), and if the current network reconstruction partition is the last network reconstruction partition list, finishing the step.
7. The method for rapidly reconstructing a power distribution network according to claim 5 or 6, wherein the process of calculating the scores of the indexes comprises: the method for scoring the percentage type indexes with the reasonable range is constructed, a segmented continuous scoring method is constructed, the midpoint of the reasonable range is set to be the maximum value of the percentage type indexes 1.0, the input index is set to be x, the lower limit of the reasonable range is min, the upper limit of the reasonable range is max, the inner gradient of the reasonable range is r1, the outer gradient of the reasonable range is r2, the midpoint mid of the reasonable range is (min + max)/2, and the scoring definition is as follows:
score 1- (mid-min) x r 1- (min-x) x r2 when x < min;
scoring score 1- | x-mid | × r1 when min ≦ x ≦ max;
when max < x, score 1- (mid-min) x r 1- (x-max) x r 2.
8. The method for fast reconstructing power distribution network as claimed in claim 1, wherein said step (10) comprises:
(1) screening a transfer scheme meeting the condition of lifting the ground state index from the network reconstruction partition, wherein the condition of lifting the ground state index comprises the following steps: the reconstructed line average load rate is smaller than the ground state line average load rate, the reconstructed line maximum load rate is smaller than the ground state line maximum load rate, the reconstructed distribution transformation average per unit voltage is larger than the ground state distribution transformation average per unit voltage, and the reconstructed distribution transformation minimum per unit voltage is larger than the ground state distribution transformation minimum per unit voltage;
(2) selecting a transfer scheme with the highest reconstruction comprehensive score from the transfer schemes for improving the ground state index as an optimal transfer scheme of the corresponding network reconstruction partition;
(3) and forming the optimal power transfer schemes of all the network reconstruction partitions into a complete power transfer scheme, and finishing the rapid reconstruction of the power distribution network based on the weighting index optimization.
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