CN113783185B - Quick reconstruction method for power distribution network - Google Patents
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Abstract
The application belongs to power system simulation, and relates to a rapid reconstruction method for a power distribution network. Starting from the problems of heavy overload, low voltage and the like existing in the operation of a power distribution network, aiming at a power distribution network feeder to which problem equipment belongs, adopting a forward and reverse topology analysis method to generate a transfer scheme aiming at each problem equipment; the transfer scheme relates to the situation of transferring in and out a plurality of feeder lines, and generates a plurality of network reconstruction partitions according to the association relation of the feeder lines, wherein the reconstruction partitions are the minimum set of the transfer scheme on the influence of the flow distribution; and recalculating the power flow of each reconstruction partition according to the transfer scheme to obtain the weighted indexes of the transfer scheme aiming at different types of problem equipment, and obtaining the optimal transfer scheme by comparing the ground state indexes and the weighted indexes of all the transfer schemes. According to the method, topology searching is carried out on specific problem equipment, and all transfer schemes are efficiently found. And an optimal reconstruction strategy capable of improving the ground state index is reasonably provided by adopting a weighted index optimization method.
Description
Technical Field
The application belongs to the technical field of power system simulation, and particularly relates to a power distribution network rapid reconstruction method.
Background
Aiming at the problems of heavy overload of a line, low voltage of a distribution transformer and the like existing in the operation of a power distribution network, a traditional dispatcher needs to input a large amount of manpower and material resources for searching the reasons of the problems and analyzing the conversion schemes, and under the condition that the power distribution network is larger in scale and the operation modes are more and more, the work for searching the conversion schemes for solving the problems and comparing the safety of various conversion schemes is increasingly difficult.
Disclosure of Invention
The application aims to provide a rapid reconstruction method for a power distribution network, which aims to overcome the defects of the prior art.
The application provides a rapid reconstruction method of a power distribution network, which comprises the following steps:
(1) The method comprises the steps of reading problem equipment information in a 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-end equipment information and single-end equipment information, simplifying the power grid model into nodes, single-end equipment and double-end equipment, storing the single-end equipment in an equipment list related to one node according to equipment node numbers, and storing the double-end equipment in an equipment list related to two nodes;
(3) Reading remote signaling states of a breaker and a disconnecting link device in the power distribution network, and storing the breaker and the disconnecting link which are disconnected in the remote signaling states in a disconnection switch list;
(4) According to the node type of the power distribution network, 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) Performing topology search from the forward direction of the unsearched node list, sequentially obtaining sub-nodes, node-associated single-end devices and node-associated double-end devices by adopting breadth-first search logic according to the association relation between power distribution network devices and nodes, setting feeder lines to which corresponding devices belong as the feeder lines to which current nodes belong until the power grid ends or switching devices with the remote signaling states being disconnected are searched, and marking the traversed nodes, single-end devices and double-end devices as electrified states;
(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 the first problem device in the problem device list if the problem device list is not empty;
(7) Traversing a transfer scheme list of the problem equipment, constructing a network reconstruction partition by taking a feeder line of an opening switch and a feeder line of a closing switch in the transfer scheme as an association, 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 the partitions into the network reconstruction partition list;
(8) Counting the power distribution network ground state load factor index and the voltage index before power supply switching, calculating the power distribution network ground state final score according to the set index weights, judging the network reconstruction partition list, jumping to the step (9) if the network reconstruction partition list is empty, and taking out the first network reconstruction partition if the network reconstruction partition list is not empty;
(9) Sequentially operating action switches corresponding to each conversion scheme in the reconstruction partition, calculating the feeder power flow of the partition, counting load rate indexes and voltage indexes after conversion, and calculating the final score of each conversion scheme according to the set weight of each index;
(10) And comparing the ground state of the power distribution network with the average load rate, the maximum load rate, the average per unit voltage and the minimum per unit voltage of the power distribution transformer after reconstruction, grading the conversion schemes, screening out the optimal conversion scheme of the network reconstruction partition, and completing the network reconstruction of the power distribution network.
The rapid reconstruction method of the power distribution network provided by the application has the following advantages:
starting from a power distribution network operation problem device, adopting a topology analysis method aiming at a power distribution network feeder to which the problem device belongs, and generating a transfer scheme aiming at each problem device by carrying out topology search on specific problem devices; the partition feeder indexes are calculated efficiently by carrying out partition combination on the equipment feeder and the transfer feeder with specific problems, and the optimal reconstruction strategy of the power distribution network capable of improving the ground state indexes is reasonably given by adopting a weighted index optimization method. The method of the application includes, but is not limited to, giving out a problem device transfer scheme, and can be extended to any device transfer scheme analysis and preference.
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 application.
Drawings
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 1 is a block diagram of a fast reconfiguration process for a power distribution network according to one embodiment of the method of the present application.
FIG. 2 is a topology search flow chart of step (5) in one embodiment of the method.
FIG. 3 is a flowchart illustrating the calculation of the network reconfiguration partition indicator in step (9) according to one embodiment of the present method.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 1 is a schematic flow diagram illustrating a method for fast reconfiguration of a power distribution network according to one embodiment of the present application. The method for rapidly reconstructing the power distribution network can be applied to user equipment such as mobile phones and tablet computers.
An embodiment of the method for rapidly reconstructing a network of a power distribution network according to the present application 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; a disconnection switch list is built and used for storing switching equipment disconnected by remote signaling 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 the network reconstruction partition constructed according to the topology search result; constructing a feeder list of a network reconstruction partition, which is used for storing feeders contained in the network reconstruction partition; and constructing a network reconstruction partition transfer scheme list for storing transfer schemes contained in the network reconstruction partition.
According to one embodiment of the method of the application:
in step 1, reading problem equipment information such as heavy overload lines, low-voltage distribution transformers and the like in a power distribution network from a power flow calculation result of the power distribution network or other platform systems, wherein the problem equipment information comprises equipment numbers, equipment names, fault types and equipment types, and storing the problem equipment information in a problem equipment list for topology searching;
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 segments, circuit breakers, knife switches, distribution transformer windings, and single-ended equipment information (mainly including equipment number, equipment name, equipment type, belonging feeder, node one number) such as loads, distributed power sources, capacitive reactors, wherein a single-ended equipment associates a single equipment node, a double-ended equipment associates two equipment nodes, the power network model is simplified into nodes, single-ended equipment and double-ended equipment, according to the equipment node number, the single-ended equipment is added to an equipment list of its associated node, the double-ended equipment is respectively added to an equipment list of its associated two nodes, and an associated node equipment list is generated for each node;
in step 3, the remote signaling states (mainly including switch numbers, switch names, and switch opening or closing state information) of the circuit breakers and the disconnecting link devices in the distribution network are read from a database or other platform systems, the circuit breakers and the disconnecting links with the open remote signaling states are stored in the open switch list, and the remote signaling states are mainly used for searching when topology searching is carried out, and searching is stopped when the circuit breakers and the disconnecting link devices with the open remote signaling states are found.
In step 4, according to the node type of the power distribution network, sequentially adding the high-voltage side main transformer bus root nodes into the unsearched node list, and creating a feeder line for each high-voltage side main transformer bus root node, (used for representing a container covering a plurality of nodes, a plurality of single-ended devices and a plurality of double-ended devices); judging the unsearched node list, ending the step if the unsearched node list is empty, and acquiring a first root node from the unsearched node list if the unsearched node list is not empty, wherein the specific 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) 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, the topology searching flow chart is shown in fig. 2, according to the association relation between the equipment and the nodes, breadth-first searching logic is adopted to sequentially acquire sub-nodes, node-associated single-end equipment and node-associated double-end equipment, the feeder line to which the sub-nodes, the node-associated single-end equipment and the node-associated double-end equipment belong is set as the feeder line to which the current node belongs until the power grid end or the switching equipment with the remote signaling state being disconnected is searched, and the traversed node, the single-end equipment and the double-end equipment are marked as the electrified state. 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 searching node counting position node of an unsearched node list as a current node, enabling a feeder line to which the current node belongs to be the current feeder line, judging a node equipment list of the current node, jumping to the step (3) if the node equipment list of the current node is empty, and traversing the node equipment list of the current node if the node equipment list of the current node is not empty, wherein the specific steps are as follows:
(2-1) acquiring a first node device in a node device list of a current node, and setting the node device as the current node device;
(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 device belongs to the current feeder line, and marking that the current node device has traversed;
(2-4) judging the type of the current node equipment, if the type of the current node equipment is single-ended equipment, jumping to the step (2-6), and if the type of the current node equipment is double-ended equipment, acquiring opposite-end nodes 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 belonging to a current feeder line, marking the opposite end node as traversed, marking the opposite end node as a charged state, marking a 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 a 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 the step (3);
(3) Judging the search node sequence number, if the search node sequence number is smaller than the non-search node list length NS, adding 1 to the search node sequence number count, returning to the step (2), and if the search node sequence number is equal to NS, executing the step (4);
(4) Removing the first NS traversed nodes from the unsearched node list, returning to step (1);
(5) And the list of the unsearched nodes is empty, the forward topology search is finished, and the step is completed.
In step 6, according to the device name in the problem device list, 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, 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, the first problem device in the problem device list is taken out. The method comprises the following specific steps:
(1) According to the forward topology search result, acquiring a feeder line to which the current problem equipment belongs, judging the disconnection switch list, if the disconnection switch list is empty, jumping to the step (7), and if the disconnection switch list is not empty, taking out a first switch in the disconnection switch list, and performing the step (2);
(2) Acquiring a head end node and a tail end node of a current disconnection 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 whether the feeder line of the head end node and the feeder line of the tail end node are the same as the feeder line of the problem equipment, if one of the head end node and the tail end node is the same as the feeder line of the problem equipment, judging that the current disconnecting switch can transfer the current node equipment to the other feeder line, and performing the step (5), if no feeder line of the head end node and the tail end node is the same as the feeder line of the problem equipment or the feeder line of the head end node and the feeder line of the tail end node are the same as the feeder line of the problem equipment, jumping to the step (6);
(5) Obtaining a common father node of a feeder node of current problem equipment connected with a current disconnection switch and the current problem equipment according to the topology search result in the step (5), and searching for a closest closed 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 of 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, acquiring 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) 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, completing the step.
In step 8, statistics is performed on the load factor index and the voltage index before power supply, and according to the set weight of each index, the final grade of the ground state is calculated, the network reconfiguration partition list is judged, if the network reconfiguration partition list is empty, the step (9) is skipped, if the network reconfiguration partition list is not empty, the first network reconfiguration partition is taken out, and the specific steps are as follows:
(1) Acquiring a feeder line list of a network reconstruction partition from a current network reconstruction partition;
(2) Acquiring all lines and distribution transformers of feeder lines in a network reconstruction partition feeder line list according to feeder lines to which the equipment marked in the step (5) belongs, and counting the average load rate of the ground state line, the maximum load rate of the ground state line, the average voltage of ground state distribution and the lowest voltage of the ground state distribution transformer according to a ground state power flow result;
(3) Calculating a line load rate score, setting that the line load rate of a power distribution network is usually lower than 40% and is light load, setting that the line load rate of the power distribution network is higher than 80% and is heavy load, wherein the average load rate represents the overall average level of the load, the maximum load rate represents the severe extreme condition of the load, the lower limit of a reasonable range of the load rate is 0.4, the upper limit of the reasonable range of the load rate is 0.8, the score gradient in a reasonable interval is 0.8, the score gradient outside the reasonable range is 1.2, and respectively calculating the average load rate score and the maximum load rate score of the line by using the method of the embodiment of the application, wherein the average value of the average load rate score and the maximum load rate score of the line is the base state line load rate score;
(4) Calculating the grading of the distribution voltage, setting the reasonable fluctuation range of the voltage of the distribution network equipment to be +/-7%, wherein the average voltage represents the overall average level of the voltage, the lowest voltage represents the extreme case of severe voltage, the lower limit of the reasonable range of the voltage is 0.93p.u., the upper limit of the reasonable range of the voltage is 1.07p.u., the grading gradient in the reasonable interval is 0.8, the grading gradient outside the reasonable range is 1.2, and respectively calculating the grading of the average per unit voltage of the ground state distribution transformer and the grading of the lowest per unit voltage of the distribution transformer by using the method of the embodiment of the application, wherein the average of the grading of the average per unit voltage of the distribution transformer and the grading of the lowest per unit voltage of the distribution transformer is the grading of the ground state voltage;
in one embodiment of the method, the scoring method of each index comprises the following steps: considering that the overload rate of a power distribution network line is too high, the out-of-limit risk exists, the overload rate is too low, the possibility of resource waste exists, the safety risk exists between the overvoltage and the low voltage of the distribution network distribution transformer voltage, a certain reasonable range exists between the line load rate and the per unit value of the distribution transformer voltage, a grading method is to be constructed for grading percentage type indexes with reasonable ranges and corresponding gradients of different ranges, a piecewise continuous grading method is constructed, the midpoint of the reasonable range is set to be the maximum value 1.0 of the percentage type indexes, the score in the reasonable range is reduced to two sides of the midpoint with smaller gradients, the score out-of-reasonable range is reduced to two sides of the midpoint with larger gradients, the input index is set to be x, the lower limit of the reasonable range is set to be min, the upper limit of the reasonable range is set to be max, the gradient in the reasonable range is r1, the gradient out-of-reasonable range is r2, and the midpoint mid= (min+max)/2 in the reasonable range is defined as follows:
score=1- (mid-min) x r1- (min-x) x r2 when x < min;
when min is less than or equal to x is less than or equal to max, scoring score=1- |x-mid|xr 1;
when max < x, score=1- (mid-min) ×r1- (x-max) ×r2;
(5) The method comprises the steps of respectively setting a line load rate scoring weight and a distribution voltage scoring weight, and calculating in a weighted manner to obtain a current network reconstruction partition ground state comprehensive score as follows: ground state line load rating score x line load rating score weight + ground state voltage score x distribution voltage score weight;
(6) And (3) judging the network reconfiguration partition list, if the current network reconfiguration partition is not the last network reconfiguration partition list, taking out the next network reconfiguration partition, returning to the step (8-1), and if the current network reconfiguration partition is the last network reconfiguration partition list, completing the step.
In step 9, the action switches of each conversion scheme in the reconstruction partition are sequentially operated, the feeder power flow of the partition is calculated, the load rate index and the voltage index after the conversion are counted, the final score of each conversion scheme is calculated according to the set weight of each index, a 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, ending the step if the network reconstruction partition list is empty, and taking out the first network reconstruction partition if the network reconstruction partition list is not empty;
(2) And (3) taking out the network reconstruction partition transfer scheme list from the current network reconstruction partition, judging the transfer scheme list, jumping to the step (3) if the current partition transfer scheme list is empty, and calculating the index score of the current network reconstruction partition transfer scheme if the current partition transfer scheme list is not empty, wherein the specific steps are as follows:
(2-1) taking out a first transfer scheme of the current network reconstruction partition;
(2-2) closing an opening switch of the current transfer scheme, opening a closing switch of the current transfer scheme, and calculating feeder power flow of a reconstruction partition of the current network;
(2-3) acquiring all lines and distribution transformers of feeder lines in a network reconstruction partition feeder line list according to feeder lines to which marked equipment in the association relation between power distribution network equipment and nodes belongs, and counting the average load rate of the reconstructed lines, the maximum load rate of the reconstructed lines, the distribution average voltage after reconstruction and the lowest distribution transformer voltage after reconstruction according to the load rate of each line and the distribution transformer voltage in the power flow calculation result in 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, setting the upper limit of the reasonable range of the load rate to be 0.8, setting the gradient of the score in a reasonable interval to be 0.8, and setting the gradient of the score out of the reasonable range to be 1.2;
(2-5) calculating the grading of the distribution voltage, setting the lower limit of the reasonable voltage range to be 0.93p.u., the upper limit of the reasonable voltage range to be 1.07p.u., the grading gradient in the reasonable interval to be 0.8, and the grading gradient out of the reasonable range to be 1.2, and respectively calculating the grading of the average per unit voltage of the distribution after reconstruction and the grading of the lowest per unit voltage of the distribution after reconstruction by using the method of the step 8 in the embodiment of the application, and taking the average of the grading of the average per unit voltage of the distribution after reconstruction and the grading of the lowest per unit voltage of the distribution after reconstruction as the grading of the voltage after reconstruction;
and (2-6) calculating a current transfer scheme reconstruction comprehensive score of the current network reconstruction partition in a weighted manner by adopting a line load rate scoring weight and a distribution voltage scoring weight consistent with the ground state, wherein the current transfer scheme reconstruction comprehensive score is as follows: the circuit load rate score after reconstruction is multiplied by the circuit load rate score weight+the voltage score after reconstruction is multiplied by the distribution voltage score weight;
(2-7) recovering the open switch of the current transferring scheme in the step (2-2) to be in an open state, and recovering the closed switch of the current transferring scheme in the step (2-2) to be in a closed state;
(2-8) judging a network reconfiguration partition transfer scheme list, if the current transfer scheme is not the last one of the network reconfiguration 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 one of the network reconfiguration partition transfer scheme list, continuing to execute the step (3);
(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, the indexes and scores of all the transfer schemes of the network reconfiguration partition list are calculated, the optimal transfer scheme of the network reconfiguration partition is screened out by comparing the scores of all the transfer schemes with the average load rate of the line, the maximum load rate of the line, the average per unit voltage of the distribution level and the minimum per unit voltage of the distribution transformer after the reconfiguration, and the network reconfiguration is completed, and the specific steps are as follows:
(1) Screening a transfer scheme meeting the condition of improving the ground state index from the network reconstruction partition, wherein the condition of improving the ground state index comprises the following steps: the average load rate of the reconstructed line is smaller than the average load rate of the ground state line, the maximum load rate of the reconstructed line is smaller than the maximum load rate of the ground state line, the average per unit voltage of the reconstructed distribution transformer is larger than the average per unit voltage of the ground state distribution transformer, and the lowest per unit voltage of the reconstructed distribution transformer is larger than the lowest per unit voltage of the ground state distribution transformer;
(2) Selecting a transfer scheme with the highest reconstruction comprehensive score from the transfer schemes for improving the ground state indexes as an optimal transfer scheme of a corresponding network reconstruction partition;
(3) And forming a complete transfer scheme by the optimal transfer scheme of all the network reconstruction partitions, and completing the rapid network reconstruction of the power distribution network based on the weighted index optimization.
What has been described above is a preferred embodiment of the present disclosure, which can be understood and practiced by those of ordinary skill in the art without undue burden. It should be noted that modifications and adaptations to the application may occur to one skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (7)
1. The utility model provides a distribution network quick reconstruction method which is characterized in that the method comprises 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 breaker and disconnecting link equipment in the power distribution network;
(4) According to the node type of the power distribution network, 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) Performing topology search from the forward direction of the unsearched node list, and setting the feeder line to which the corresponding equipment belongs as the feeder line to which the current node belongs until the power grid end or the switching equipment with the remote signaling state being disconnected is searched;
(6) Searching a problem equipment transfer scheme;
(7) Traversing a transfer scheme list of the problem equipment, constructing a network reconstruction partition by taking a feeder line of an opening switch and a feeder line of a closing switch in the transfer scheme as an association, 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 the partitions into the network reconstruction partition list;
(8) Counting the power distribution network ground state load factor index and the voltage index before power supply switching, calculating the power distribution network ground state final score according to the set index weights, judging the network reconstruction partition list, jumping to the step (9) if the network reconstruction partition list is empty, and taking out the first network reconstruction partition if the network reconstruction partition list is not empty;
(9) Sequentially operating action switches corresponding to each conversion scheme in the reconstruction partition, calculating the feeder power flow of the partition, counting load rate indexes and voltage indexes after conversion, and calculating the final score of each conversion scheme according to the set weight of each index;
(10) Comparing the power distribution network ground state with the average load rate, the maximum load rate, the average per unit voltage and the minimum per unit voltage of the distribution transformer after reconstruction, grading the conversion schemes, screening out the optimal conversion scheme of the network reconstruction partition, and completing the network reconstruction of the power distribution network;
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 searching node counting position node of an unsearched node list as a current node, enabling a feeder line to which the current node belongs to be the current feeder line, judging a node equipment list of the current node, jumping to the step (3) if the node equipment list of the current node is empty, and traversing the node equipment list of the current node if the node equipment list of the current node is not empty, wherein the specific steps are as follows:
(2-1) acquiring a first node device in a node device list of a current node, and setting the node device as the current node device;
(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 device belongs to the current feeder line, and marking that the current node device has traversed;
(2-4) judging the type of the current node equipment, if the type of the current node equipment is single-ended equipment, jumping to the step (2-6), and if the type of the current node equipment is double-ended equipment, acquiring opposite-end nodes 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 belonging to a current feeder line, marking the opposite end node as traversed, marking the opposite end node as a charged state, marking a 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 a 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 the step (3);
(3) Judging the search node sequence number, if the search node sequence number is smaller than the non-search node list length NS, adding 1 to the search node sequence number count, returning to the step (2), and if the search node sequence number is equal to NS, executing the step (4);
(4) Removing the first NS traversed nodes from the unsearched node list, returning to step (1);
(5) And the list of the unsearched nodes is empty, the forward topology search is finished, and the step is completed.
2. The method for rapid reconfiguration of a power distribution network according to claim 1, wherein the step (4) includes:
(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) 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, completing the step.
3. The method for rapid reconfiguration of a power distribution network according to claim 1, wherein the step (6) includes:
(1) According to the forward topology search result, acquiring a feeder line to which the current problem equipment belongs, judging a disconnection switch list, if the disconnection switch list is empty, jumping to the step (7), and if the disconnection switch list is not empty, taking out a first switch in the disconnection switch list, and performing the step (2);
(2) Acquiring a head end node and a tail end node of a current disconnection 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 whether the feeder line of the head end node and the feeder line of the tail end node are the same as the feeder line of the problem equipment, if one of the head end node and the tail end node is the same as the feeder line of the problem equipment, judging that the current disconnecting switch can transfer the current node equipment to the other feeder line, and performing the step (5), if no feeder line of the head end node and the tail end node is the same as the feeder line of the problem equipment or the feeder line of the head end node and the feeder line of the tail end node are the same as the feeder line of the problem equipment, jumping to the step (6);
(5) Obtaining a common father node of a feeder node of current problem equipment connected with a current disconnection switch and the current problem equipment according to the topology search result in the step (5), and searching for a closest closed 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 of 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, acquiring 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) 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, completing the step.
4. The method for rapid reconfiguration of a power distribution network according to claim 1, wherein the step (8) includes:
(1) Acquiring a feeder line list of a network reconstruction partition 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 feeder lines to which the equipment for searching the forward topology of the unsearched node list belongs, and counting the average load rate of the ground state line, the maximum load rate of the ground state line, the average voltage of the ground state distribution transformer and the lowest voltage of the ground state distribution transformer according to a ground state power flow result;
(3) Calculating a line load rate score, setting that the line load rate of a power distribution network is usually lower than 40% and is light load, and higher than 80% and is heavy load, wherein the average load rate represents the overall average level of load, the maximum load rate represents the severe extreme condition of load, the lower limit of a reasonable range of the load rate is 0.4, the upper limit of the reasonable range of the load rate is 0.8, the score gradient in a reasonable interval is 0.8, the score gradient outside the reasonable range is 1.2, and calculating the average load rate score and the maximum load rate score of the line respectively, wherein the average value of the average load rate score and the maximum load rate score of the line is the base state line load rate score;
(4) Calculating the grading of the distribution voltage, setting the reasonable fluctuation range of the voltage of the distribution network equipment to be +/-7%, wherein the average voltage represents the overall average level of the voltage, the lowest voltage represents the extreme case of severe voltage, the lower limit of the reasonable range of the voltage is 0.93p.u., the upper limit of the reasonable range of the voltage is 1.07p.u., the grading gradient in the reasonable interval is 0.8, the grading gradient outside the reasonable range is 1.2, and calculating the grading of the average per unit voltage of the distribution transformer and the grading of the lowest per unit voltage of the distribution transformer respectively, so that the average of the grading of the average per unit voltage of the distribution transformer and the grading of the lowest per unit voltage of the distribution transformer is the grading of the ground state voltage;
(5) The method comprises the steps of respectively setting a line load rate scoring weight and a distribution voltage scoring weight, and calculating in a weighted manner to obtain a current network reconstruction partition ground state comprehensive score as follows: ground state line load rating score x line load rating score weight + ground state voltage score x distribution voltage score weight;
(6) And (3) judging the network reconfiguration partition list, if the current network reconfiguration partition is not the last network reconfiguration partition list, taking out the next network reconfiguration partition, returning to the step (1), and if the current network reconfiguration partition is the last network reconfiguration partition list, finishing the step.
5. The method for rapid reconfiguration of a power distribution network according to claim 1, wherein the step (9) includes:
(1) Judging the network reconstruction partition list, if the network reconstruction partition list is empty, carrying out network reconstruction, and if the network reconstruction partition list is not empty, taking out a first network reconstruction partition;
(2) And (3) taking out the network reconstruction partition transfer scheme list from the current network reconstruction partition, judging the transfer scheme list, jumping to the step (3) if the current partition transfer scheme list is empty, and calculating the index score of the current network reconstruction partition transfer scheme if the current partition transfer scheme list is not empty, wherein the specific steps are as follows:
(2-1) taking out a first transfer scheme of the current network reconstruction partition;
(2-2) closing an opening switch of the current transfer scheme, opening a closing switch of the current transfer scheme, and calculating feeder power flow of a reconstruction partition of the current network;
(2-3) acquiring all lines and distribution transformers of the feeder lines in a feeder line list of a network reconstruction partition according to feeder lines to which marked equipment in 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 distribution voltage after reconstruction and the minimum distribution voltage after reconstruction according to the load rates of the lines and the distribution transformer voltages 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, setting the upper limit of the reasonable range of the load rate to be 0.8, setting the gradient of the score in a reasonable interval to be 0.8, setting the gradient of the score out of the reasonable range to be 1.2, respectively calculating an average load rate score of the line after reconstruction and a maximum load rate score of the line after reconstruction, and calculating the average load rate score of the line after reconstruction and the maximum load rate score of the line after reconstruction according to the average value of the average load rate score of the line after reconstruction and the maximum load rate score of the line after reconstruction;
(2-5) calculating a distribution voltage score, setting the lower limit of a reasonable voltage range to be 0.93p.u., setting the upper limit of the reasonable voltage range to be 1.07p.u., setting the gradient of the score in a reasonable interval to be 0.8, and setting the gradient of the score out of the reasonable range to be 1.2, respectively calculating an average per unit voltage score of the distribution after reconstruction and a lowest per unit voltage score of the distribution after reconstruction, and calculating a mean value of the average per unit voltage score of the distribution after reconstruction and the lowest per unit voltage score of the distribution after reconstruction;
and (2-6) calculating a current transfer scheme reconstruction comprehensive score of the current network reconstruction partition in a weighted manner by adopting a line load rate scoring weight and a distribution voltage scoring weight consistent with the ground state, wherein the current transfer scheme reconstruction comprehensive score is as follows: the circuit load rate score after reconstruction is multiplied by the circuit load rate score weight+the voltage score after reconstruction is multiplied by the distribution voltage score weight;
(2-7) recovering the open switch of the current transferring scheme in the step (2-2) to be in an open state, and recovering the closed switch of the current transferring scheme in the step (2-2) to be in a closed state;
(2-8) judging a network reconfiguration partition transfer scheme list, if the current transfer scheme is not the last one of the network reconfiguration 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 one of the network reconfiguration partition transfer scheme list, continuing to execute the step (3);
(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, completing the step.
6. The method for quickly reconstructing a power distribution network according to claim 4 or 5, wherein the process of calculating scores of various indexes is as follows: the method comprises the steps of constructing a grading method for percentage type indexes with reasonable ranges, setting the midpoint of the reasonable ranges as the maximum value 1.0 of the percentage type indexes, setting the input index as x, setting the lower limit of the reasonable ranges as min, setting the upper limit of the reasonable ranges as max, setting the gradient in the reasonable ranges as r1, setting the gradient out of the reasonable ranges as r2, and setting the midpoint mid= (min+max)/2 of the reasonable ranges as follows:
score=1- (mid-min) x r1- (min-x) x r2 when x < min;
when min is less than or equal to x is less than or equal to max, scoring score=1- |x-mid|xr 1;
when max < x, score=1- (mid-min) ×r1- (x-max) ×r2.
7. The method for rapid reconfiguration of a power distribution network according to claim 1, wherein said step (10) comprises:
(1) Screening a transfer scheme meeting the condition of improving the ground state index from the network reconstruction partition, wherein the condition of improving the ground state index comprises the following steps: the average load rate of the reconstructed line is smaller than the average load rate of the ground state line, the maximum load rate of the reconstructed line is smaller than the maximum load rate of the ground state line, the average per unit voltage of the reconstructed distribution transformer is larger than the average per unit voltage of the ground state distribution transformer, and the lowest per unit voltage of the reconstructed distribution transformer is larger than the lowest per unit voltage of the ground state distribution transformer;
(2) Selecting a transfer scheme with the highest reconstruction comprehensive score from the transfer schemes for improving the ground state indexes as an optimal transfer scheme of a corresponding network reconstruction partition;
(3) And forming a complete transfer scheme by the optimal transfer scheme of all the network reconstruction partitions, and completing the rapid network reconstruction of the power distribution network based on the weighted index optimization.
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