CN113824110B - Power grid fault static analysis method comprising spare power automatic switching strategy - Google Patents
Power grid fault static analysis method comprising spare power automatic switching strategy Download PDFInfo
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- CN113824110B CN113824110B CN202110861607.9A CN202110861607A CN113824110B CN 113824110 B CN113824110 B CN 113824110B CN 202110861607 A CN202110861607 A CN 202110861607A CN 113824110 B CN113824110 B CN 113824110B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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Abstract
The invention discloses a power grid fault static analysis method comprising a spare power automatic switching strategy, which comprises the following steps: firstly, configuring switch data in basic data of a power grid as a basis for identifying a spare power automatic switching strategy; according to the studied faults, fault information is obtained, the running state information of the power grid element is adjusted, and the power grid topological relation is updated; judging a pressed bus set and a voltage-losing bus set according to the topological relation of the power grid after the faults; automatically identifying the spare power automatic switching action strategy of the connected switch in the voltage-losing bus set and adjusting the switch position; carrying out the judgment of the step-down bus set and the automatic standby switching action processing again on the updated power grid topological relation until no step-down bus exists in the power grid or the connected switches in the step-down bus set do not meet the automatic standby switching condition; and carrying out load flow calculation according to the pressurized busbar set and the topological relation thereof, and analyzing the overload condition of the power grid after the fault. The automatic backup power switching strategy under the current operation mode can be automatically identified, the action condition of the fault backup power switching can be judged, the topology of the power grid can be adjusted, and the efficiency and the accuracy of power grid analysis can be improved.
Description
Technical Field
The invention relates to the technical field of calculation and analysis of power grid operation modes, in particular to a power grid fault static analysis method comprising a spare power automatic switching strategy.
Background
In power grid planning and operation work, static analysis is usually required to be carried out on a power grid, and the purpose of the static analysis is to analyze the topological structure and the power flow distribution situation of the power grid after the expected faults, so that the static analysis has important significance for identification, evaluation and management and control work of the power grid operation risk. In order to improve the power supply reliability, a modern power grid adopts two or more power supplies to supply power, and a standby power supply is switched on through a standby automatic switching device under the condition of main power failure, so that large-area power failure accidents are prevented. In daily power grid static analysis work, the strategy and action condition of the fault backup automatic switching equipment are considered, and the accuracy of the power grid operation risk analysis result is improved.
In the prior art, the power system calculation analysis software can calculate the power flow of the power grid in a determined operation mode, lacks a model of the automatic backup power switching device, cannot consider the action condition of the automatic backup power switching after faults, and cannot reflect the actual operation state of the power grid. The automatic backup power switching strategy is manually analyzed, and the operation mode of the power grid after faults is adjusted to calculate, so that great difficulty is brought to static analysis work of the power grid. With the adjustment of the operation mode, the strategy of the spare power automatic switching equipment is flexible and changeable, the manual analysis method is large in workload, misjudgment is easy to occur, and a quick and effective solution is not available at present.
Disclosure of Invention
The embodiment of the invention provides a power grid fault static analysis method comprising a spare power automatic switching strategy, which can automatically identify the spare power automatic switching strategy in a current operation mode, judge the action condition of the spare power automatic switching after faults and adjust the power grid topology, thereby improving the efficiency and the accuracy of the power grid static analysis.
The embodiment of the invention provides a power grid fault static analysis method comprising a spare power automatic switching strategy, which comprises the following steps:
basic data and fault data of a power grid are obtained, and switching data are configured in the basic data to obtain a power grid topological relation;
adjusting the running state information of the power grid according to the fault information, and updating the topological relation of the power grid;
judging an initial set of voltage buses and a set of voltage-losing buses of the power grid according to the updated power grid topological relation;
when the initial voltage-losing bus set of the power grid is not empty, selecting a voltage-losing bus from the initial voltage-losing bus set of the power grid to judge the spare power automatic switching condition, performing spare power automatic switching action processing according to a judging result, and updating the voltage-losing bus set and the voltage-losing bus set of the power grid;
when the updated voltage-losing busbar set is empty, generating power flow calculation data according to the latest obtained voltage-losing busbar set, calculating power flow distribution after faults, and analyzing overload conditions of the power grid after the faults.
As a preferred mode, the method further comprises:
when the initial voltage-losing bus set of the power grid is empty, generating power flow calculation data according to the initial voltage-losing bus set of the power grid, calculating power flow distribution after faults, and analyzing overload conditions of the power grid after the faults.
Preferably, the method further comprises:
when the updated voltage-losing bus set is not empty, selecting a voltage-losing bus from the updated voltage-losing bus set to carry out spare power automatic switching condition judgment, carrying out spare power automatic switching action processing according to a judging result, updating the voltage-losing bus set and the voltage-losing bus set of the power grid again, judging the latest obtained voltage-losing bus set until the latest obtained voltage-losing bus set is empty or any voltage-losing bus in the latest obtained voltage-losing bus set does not meet the spare power automatic switching condition;
and generating load flow calculation data according to the latest obtained pressurized bus set, calculating load flow distribution after faults, and analyzing overload conditions of the power grid after the faults.
Preferably, the automatic switching condition includes: bus-tie automatic switching conditions, line automatic switching conditions and main transformer low-voltage automatic switching conditions;
selecting a voltage-losing bus from an initial voltage-losing bus set of the power grid to judge the spare power automatic switching condition, performing spare power automatic switching action processing according to a judging result, and updating the voltage-losing bus set and the voltage-losing bus set of the power grid, wherein the method specifically comprises the following steps:
Selecting a voltage-loss bus from the voltage-loss bus set to judge the spare power automatic switching condition;
judging whether the voltage-losing bus meets the bus-tie spare power automatic switching condition or not, if the voltage-losing bus meets the bus-tie spare power automatic switching condition, performing bus-tie spare power automatic switching on a switch connected with the voltage-losing bus, and updating a voltage bus set and a voltage-losing bus set of a power grid;
if the voltage-losing bus does not meet the bus-tie automatic switching condition, judging whether the voltage-losing bus meets the line automatic switching condition, and if the voltage-losing bus meets the line automatic switching condition, performing line automatic switching on a switch connected with the voltage-losing bus, and updating a voltage bus set and a voltage-losing bus set of a power grid;
if the voltage-losing bus does not meet the bus-to-bus automatic switching condition, judging whether the voltage-losing bus meets the main transformer low-voltage automatic switching condition, and if the voltage-losing bus meets the main transformer low-voltage automatic switching condition, performing main transformer low-voltage automatic switching on a switch connected with the voltage-losing bus, and updating a voltage bus set and a voltage-losing bus set of a power grid.
Preferably, the grid base data includes: calculating parameters of a power grid element, the running state of the power grid element, a power grid topological relation, generator output basic data and generator load basic data;
The configuration switch data is to add switch parameters related to spare power automatic switching in the power grid basic data, and specifically includes: the switch type, bus information on two sides of the switch, the switch position and the switch participate in the automatic switching judgment mark.
Preferably, the adjusting the operation state information of the power grid according to the fault information updates the topology relationship of the power grid, specifically:
switching the operation state of a fault element of the power grid into an exit state according to fault information in the power grid, wherein the fault information is specifically a single fault or a plurality of simultaneous faults of the power grid element, and the power grid element comprises: lines, transformers, and bus bars.
As a preferred mode, the distinguishing the set of the voltage bus and the set of the voltage-losing bus of the power grid according to the updated topological relation of the power grid specifically includes:
generating an undirected and unowned n×n adjacency matrix a according to the updated power grid topology, wherein matrix element a ij The connection relation between the bus i and the bus j is shown, wherein if the bus i and the bus j are directly connected, A is as follows ij =1; if the bus i and the bus j are not directly connected, A ij ＝0；
Performing shortest path calculation on the adjacent matrix A by adopting Floyd algorithm to obtainObtaining a shortest path matrix P, wherein matrix elements P ij Representing the path length from busbar i to busbar j, 0<i≤n，0<j≤n；
Transforming shortest path matrix P into a blocking matrix by simple matrix transformationThe blocking matrix U corresponds to elements of the voltage busbar set, and the blocking matrix V corresponds to elements of the voltage-losing busbar set;
and judging a set of voltage buses and a set of voltage-losing buses in the power grid according to the numbers of the matrix elements.
Further, the bus-tie spare power automatic switching condition specifically includes:
the bus-bar switch in operation is connected with the voltage-losing bus, the position of the bus-bar switch is divided, the bus-bar switch participates in the spare power automatic switching judgment and is identified as 1, and the bus on the opposite side of the bus-bar switch is in the latest voltage bus set;
marking the bus-tie switch meeting the bus-tie spare power automatic switching condition as a spare bus-tie switch;
the bus-bar automatic switching action specifically comprises the following actions of executing the following actions on a switch connected with the voltage-losing bus:
switching the switch position of the line switch participating in the automatic switching judgment mark 1 into a split position;
when the voltage-losing bus is a low-voltage side bus, switching the switch position of a low-voltage side switch of a transformer of the low-voltage side bus into a split position;
and switching the switch position of the standby bus-tie switch into the closing position.
Further, the line spare power automatic switching condition specifically includes:
the circuit switch in operation is connected with the voltage-losing bus, the position of the circuit switch is divided, the circuit switch participates in the automatic switching judgment of the standby power to be identified as 1, and the bus on the opposite side of the circuit switch is in the latest voltage bus set;
marking the line switch meeting the line standby automatic switching condition as a standby line switch;
the line backup automatic switching action specifically comprises the following actions of executing the following actions on a switch connected with the voltage-losing bus:
switching the switch position of the line switch participating in the automatic switching judgment mark 1 into a split position;
if the parallel operation buses exist, the positions of the line switches which are connected with the parallel operation buses and participate in the automatic switching judgment of the standby power supply are switched to be separated, wherein the parallel operation buses are as follows: a bus connected with the voltage-losing bus through a bus-connected switch with a switch position being a closing position;
and switching the switch position of the standby line switch to the closing position.
Further, the main transformer low-standby automatic switching condition specifically includes:
the low-voltage bus is connected with the low-voltage bus in operation, the position of the low-voltage switch is divided, the low-voltage switch participates in the automatic standby switching judgment and is marked as 1, the bus connected at the high/medium side of the low-voltage switch is in the latest voltage bus set, and the parallel operation bus exists in the low-voltage bus, wherein the parallel operation bus is as follows: a bus connected with the voltage-losing bus through a bus-connected switch with a switch position being a closing position;
Marking the line switch meeting the main transformer low-standby automatic switching condition as a standby low-standby switch;
the main transformer low-voltage automatic switching action specifically comprises the following actions of executing the following actions on a switch connected with the voltage-losing bus:
switching the switch position of the low-voltage switch connected with the parallel operation bus to be divided;
and switching the switch position of the standby low-voltage switch to the on-position.
The invention provides a power grid fault static analysis method comprising a spare power automatic switching strategy, which comprises the following steps: firstly, configuring switch data in basic data of a power grid as a basis for identifying a spare power automatic switching strategy; according to the studied faults, fault information is obtained, the running state information of the power grid element is adjusted, and the power grid topological relation is updated; judging a pressed bus set and a voltage-losing bus set according to the topological relation of the power grid after the faults; automatically identifying the spare power automatic switching action strategy of the connected switch in the voltage-losing bus set and adjusting the switch position; carrying out the judgment of the step-down bus set and the automatic standby switching action processing again on the updated power grid topological relation until no step-down bus exists in the power grid or the connected switches in the step-down bus set do not meet the automatic standby switching condition; and carrying out load flow calculation according to the pressurized busbar set and the topological relation thereof, and analyzing the overload condition of the power grid after the fault. The automatic backup power switching strategy under the current operation mode can be automatically identified, the action condition of the backup power switching after the fault is judged, the topology of the power grid is adjusted, the efficiency and the accuracy of power grid analysis are improved, and the fault maintenance is convenient.
Drawings
Fig. 1 is a schematic flow chart of a static analysis method for power grid faults, which includes a spare power automatic switching strategy and is provided in an embodiment of the present invention;
fig. 2 is a schematic diagram of a power grid structure before and after a bus-tie automatic backup power switching operation, wherein a left side sub-graph is a power grid structure diagram before the operation, and a right side sub-graph is a power grid structure diagram after the operation;
fig. 3 is a schematic diagram of a power grid structure before and after a low-side bus-tie automatic switching operation, wherein a left side sub-graph is a power grid structure diagram before the operation, and a right side sub-graph is a power grid structure diagram after the operation;
fig. 4 is a schematic diagram of a power grid structure before and after a line backup power automatic switching operation, wherein a left side sub-graph is a power grid structure diagram before the operation, and a right side sub-graph is a power grid structure diagram after the operation;
fig. 5 is a schematic diagram of a power grid structure before and after a main transformer low-power-supply automatic switching operation, wherein a left side sub-graph is a power grid structure diagram before the operation, and a right side sub-graph is a power grid structure diagram after the operation;
FIG. 6 is a schematic flow chart of a static analysis method for power grid faults including a backup power automatic switching strategy according to another embodiment of the present invention;
reference numerals:
210-240 are line switches, 250 are bus-bar switches, the gray represents the switch position of the switch is the on position, and the white represents the switch position of the switch is the off position; 260 to 270 are buses;
310-320 are transformers, 330-340 are low-voltage switches, 350 is a bus-bar switch, the switch position of the gray representing switch is a closing position, and the switch position of the white representing switch is a dividing position; 360-370 is a bus;
410-440 are line switches, 450 are bus-tie switches, the switch position of gray representing the switch is the on position, and the switch position of white representing the switch is the off position; 460-470 are bus bars;
510-520 are transformers, 530-540 are low-voltage switches, 550 are bus-bar switches, the switch positions of gray representing switches are on-positions, and the switch positions of white representing switches are off-positions; 560-570 are bus bars.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a power grid fault static analysis method comprising a spare power automatic switching strategy, and referring to fig. 1, the embodiment of the invention provides a flow diagram of the power grid fault static analysis method comprising the spare power automatic switching strategy, which comprises steps S101-S105;
S101, acquiring basic data and fault data of a power grid, and configuring switch data in the basic data to obtain a power grid topological relation;
s102, adjusting the running state information of the power grid according to the fault information, and updating the topological relation of the power grid;
s103, distinguishing an initial set of voltage buses and a set of voltage-losing buses of the power grid according to the updated power grid topological relation;
s104, when the initial voltage-losing bus set of the power grid is not empty, selecting a voltage-losing bus from the initial voltage-losing bus set of the power grid to judge the spare power automatic switching condition, performing spare power automatic switching action processing according to a judging result, and updating the voltage-losing bus set and the voltage-losing bus set of the power grid;
and S105, when the updated voltage-losing busbar set is empty, generating power flow calculation data according to the latest obtained voltage-losing busbar set, calculating power flow distribution after faults, and analyzing overload conditions of the power grid after the faults.
When the embodiment is implemented, firstly, switching data is configured in basic data of a power grid and is used as a basis for identifying the spare power automatic switching strategy; according to the studied faults, fault information is obtained, the running state information of the power grid element is adjusted, and the power grid topological relation is updated; judging an initial set of voltage buses and a set of voltage-losing buses of the power grid according to the topological relation of the power grid after the faults; when the initial voltage-losing bus set of the power grid is not empty, automatically identifying the spare power automatic switching action strategy of the connected switch in the voltage-losing bus set, and adjusting the switch position according to the judging result;
Carrying out the judgment of the set of the voltage-losing buses again on the updated power grid topological relation, generating load flow calculation data according to the latest obtained set of the voltage-losing buses when the updated set of the voltage-losing buses is empty, calculating load flow distribution after faults, and analyzing the overload condition of the power grid after the faults
The embodiment of the invention provides a power grid fault static analysis method comprising a spare power automatic switching strategy, which comprises the following steps: firstly, configuring switch data in basic data of a power grid as a basis for identifying a spare power automatic switching strategy; according to the studied faults, fault information is obtained, the running state information of the power grid element is adjusted, and the power grid topological relation is updated; judging a pressed bus set and a voltage-losing bus set according to the topological relation of the power grid after the faults; automatically identifying the spare power automatic switching action strategy of the connected switch in the voltage-losing bus set and adjusting the switch position; carrying out the judgment of the set of the voltage-losing buses and the automatic switching action processing of the spare power again on the updated power grid topological relation until the set of the voltage-losing buses is empty; and carrying out load flow calculation according to the pressurized busbar set and the topological relation thereof, and analyzing the overload condition of the power grid after the fault. The automatic backup power switching strategy under the current operation mode can be automatically identified, the action condition of the fault backup power switching can be judged, the topology of the power grid can be adjusted, and the efficiency and the accuracy of power grid analysis can be improved.
In yet another embodiment provided by the present invention, the method further includes step S106:
and S106, when the initial voltage-losing bus set of the power grid is empty, generating power flow calculation data according to the initial voltage-losing bus set of the power grid, calculating power flow distribution after faults, and analyzing overload condition of the power grid after the faults.
When the embodiment is specifically implemented, after the initial voltage-losing bus set and the voltage bus set of the power grid are judged, the initial voltage-losing bus set of the power grid is judged, when the voltage-losing bus set is empty, the power grid is indicated to run normally, the switching of the spare power automatic switching strategy is not needed, power flow calculation data are generated according to the latest obtained voltage bus set, power flow distribution after faults is calculated, and the overload condition of the power grid after the faults is analyzed.
In yet another embodiment provided by the present invention, the method further includes step S107:
s107, when the updated voltage-losing busbar set is not empty, selecting a voltage-losing busbar from the updated voltage-losing busbar set to carry out spare power automatic switching condition judgment, carrying out spare power automatic switching action processing according to a judgment result, updating the voltage-losing busbar set and the voltage-losing busbar set of the power grid again, judging the latest obtained voltage-losing busbar set until the latest obtained voltage-losing busbar set is empty or any voltage-losing busbar in the latest obtained voltage-losing busbar set does not meet the spare power automatic switching condition;
And generating load flow calculation data according to the latest obtained pressurized bus set, calculating load flow distribution after faults, and analyzing overload conditions of the power grid after the faults.
When the embodiment is implemented in practice, the updated power grid topological relation is subjected to the voltage-losing busbar set judgment again, when the updated voltage-losing busbar set is not empty, a voltage-losing busbar is selected from the updated voltage-losing busbar set to carry out the spare power automatic switching condition judgment, the spare power automatic switching action processing is carried out according to the judgment result, the voltage-losing busbar set and the voltage-losing busbar set of the power grid are updated again, the newly obtained voltage-losing busbar set is judged, the updated power grid topological relation is subjected to the voltage-losing busbar set judgment and the spare power automatic switching action processing again, and the spare power automatic switching condition is not met by the power grid no-voltage-losing busbar or the connected switches in the voltage-losing busbar set;
and counting the loss load quantity or the number of users according to the voltage-loss busbar set, evaluating the fault event level, carrying out load flow calculation according to the voltage-loss busbar set and the topological relation thereof, and analyzing the overload condition of the power grid after the fault.
In another embodiment provided by the present invention, the automatic switching condition includes: bus-tie automatic switching conditions, line automatic switching conditions and main transformer low-voltage automatic switching conditions;
Selecting a voltage-losing bus from an initial voltage-losing bus set of the power grid to judge the spare power automatic switching condition, performing spare power automatic switching action processing according to a judging result, and updating the voltage-losing bus set and the voltage-losing bus set of the power grid, wherein the method specifically comprises the following steps:
selecting a voltage-loss bus from the voltage-loss bus set to judge the spare power automatic switching condition;
judging whether the voltage-losing bus meets the bus-tie spare power automatic switching condition or not, if the voltage-losing bus meets the bus-tie spare power automatic switching condition, performing bus-tie spare power automatic switching on a switch connected with the voltage-losing bus, and updating a voltage bus set and a voltage-losing bus set of a power grid;
if the voltage-losing bus does not meet the bus-tie automatic switching condition, judging whether the voltage-losing bus meets the line automatic switching condition, and if the voltage-losing bus meets the line automatic switching condition, performing line automatic switching on a switch connected with the voltage-losing bus, and updating a voltage bus set and a voltage-losing bus set of a power grid;
if the voltage-losing bus does not meet the bus-to-bus automatic switching condition, judging whether the voltage-losing bus meets the main transformer low-voltage automatic switching condition, and if the voltage-losing bus meets the main transformer low-voltage automatic switching condition, performing main transformer low-voltage automatic switching on a switch connected with the voltage-losing bus, and updating a voltage bus set and a voltage-losing bus set of a power grid.
When the embodiment is implemented, the spare power automatic switching condition of the connected switch is automatically identified in the voltage-losing bus set, and spare power automatic switching action processing is carried out according to the identification result;
the bus-tie spare power automatic switching judgment is carried out preferentially, and if the bus-tie spare power automatic switching condition is met, the switch positions connected with the voltage-losing bus and the bus running in parallel are adjusted;
if the bus-tie spare power automatic switching condition is not provided, judging the line/main transformer low-power spare power automatic switching condition;
if the spare power automatic switching condition of the line is met, the switch position connected with the voltage-losing bus and the parallel operation bus is adjusted;
and if the voltage-losing bus is a low-side bus, performing automatic switching judgment of the main transformer low-back-up, and if the automatic switching condition of the main transformer low-back-up is met, adjusting the switch positions connected with the voltage-losing bus and the parallel operation buses thereof.
In the process of traversing the voltage-losing busbar set, after a certain busbar meets the busbar automatic switching or line/low-voltage automatic switching condition and corresponding switching operation is carried out, the busbar automatic switching is regarded as completing a round of automatic switching action, and the traversing is stopped at the moment to carry out the next step.
In yet another embodiment provided by the present invention, the grid base data includes: calculating parameters of a power grid element, the running state of the power grid element, a power grid topological relation, generator output basic data and generator load basic data;
The configuration switch data is to add switch parameters related to spare power automatic switching in the power grid basic data, and specifically includes: the switch type, bus information on two sides of the switch, the switch position and the switch participate in the automatic switching judgment mark.
When the embodiment is implemented, the power grid basic data includes power grid element calculation parameters, power grid element running states, power grid topological relations, generator output basic data and generator load basic data, and the basic requirements of power flow calculation are met.
The configuration switch data refers to adding switch parameters related to spare power automatic switching in basic data, and specifically includes the following steps:
switch type: a line side switch, a transformer side switch and a bus switch;
bus bars on two sides of the switch: bus 1 and bus 2;
switch position: 0 (split), 1 (combined);
and participating in the automatic switching judgment mark: 1 (yes), 0 (no).
In another embodiment of the present invention, the adjusting the operation state information of the power grid according to the fault information updates the topology relationship of the power grid, specifically:
switching the operation state of a fault element of the power grid into an exit state according to fault information in the power grid, wherein the fault information is specifically a single fault or a plurality of simultaneous faults of the power grid element, and the power grid element comprises: lines, transformers, and bus bars.
When the embodiment is implemented, the faults researched in the fault analysis are usually single faults or multiple simultaneous faults of elements such as a line, a transformer, a bus and the like, and the running state of the corresponding element is changed into exit according to the fault information;
in another embodiment of the present invention, the distinguishing the initial set of voltage buses and the initial set of voltage-losing buses according to the updated topological relation of the power grid specifically includes:
generating an undirected and unauthorized n multiplied by n adjacency matrix A according to the updated power grid topological relation, wherein matrix element A ij Representing the connection relation between the bus i and the bus j;
carrying out shortest path calculation on the adjacent matrix A by adopting a Floyd algorithm to obtain a shortest path matrix P, wherein matrix elements P are obtained by adopting a matrix element P ij Indicating the path relationship between bus i and bus j, 0<i≤n，0<j≤n；
Transforming shortest path matrix P into a blocking matrix by simple matrix transformationThe blocking matrix U corresponds to elements of the voltage busbar set, and the blocking matrix V corresponds to elements of the voltage-losing busbar set;
and judging a set of voltage buses and a set of voltage-losing buses in the power grid according to the numbers of the matrix elements.
In the embodiment, the bus bar (the number is assumed to be n) and the bus bar are operated according to the operation Generating undirected and unowned n multiplied by n adjacency matrix A by topological relation, and matrix element A ij Representing the connection relation between the bus i and the bus j; the method comprises the following steps:
if the bus i is directly connected with the bus j, A ij =1, otherwise, a ij ＝0；A ii Then it is set directly to 0. The two bus bars are directly connected as defined below:
1) The positions of the line side switches connected with the two buses are 1 (combined position) through the running line connection;
2) The positions of the side switches of the transformers connected with the two buses are 1 (combined positions) through the connection of the running transformers;
3) The switch is connected through an operating switch, and the switch position is 1 (combined position).
Preferably, a Floyd algorithm is applied to calculate the shortest path of the adjacent matrix a, and a shortest path matrix P is obtained. If matrix element P ij And if not, proving that a passage exists between the bus i and the bus j, otherwise, proving that no passage exists between the bus i and the bus j. If a voltage-losing bus exists in the power grid, the voltage-losing bus can be converted into a block matrix through simple matrix conversion:
wherein the blocking matrix U corresponds to an element of the voltage bus set, the blocking matrix V corresponds to an element of the voltage-losing bus set, and the judgment of the voltage bus set and the voltage-losing bus set in the power grid is realized according to the serial numbers of the matrix elements.
In another embodiment provided by the invention, the bus-tie spare power automatic switching condition specifically includes:
The bus-bar switch in operation is connected with the voltage-losing bus, the position of the bus-bar switch is divided, the bus-bar switch participates in the spare power automatic switching judgment and is identified as 1, and the bus on the opposite side of the bus-bar switch is in the latest voltage bus set;
marking the bus-tie switch meeting the bus-tie spare power automatic switching condition as a spare bus-tie switch;
the bus-bar automatic switching action specifically comprises the following actions of executing the following actions on a switch connected with the voltage-losing bus:
switching the switch position of the line switch participating in the automatic switching judgment mark 1 into a split position;
when the voltage-losing bus is a low-voltage side bus, switching the switch position of a low-voltage side switch of a transformer of the low-voltage side bus into a split position;
and switching the switch position of the standby bus-tie switch into the closing position.
When the embodiment is implemented specifically, the bus-tie spare power automatic switching judgment is preferably performed, and the bus-tie spare power automatic switching conditions are as follows:
1) The bus-bar switch in operation is connected with the voltage-losing bus;
2) The position of the bus-tie switch is 0 (split), and the judgment mark of the participation spare power automatic switching is 1;
3) The bus on the opposite side of the bus-bar switch is in the pressed bus-bar set.
If the bus-tie spare power automatic switching condition is met, performing the following action operation on a switch connected with the voltage-losing bus:
1) The switch position of a line switch which participates in the automatic switching judgment and is marked as 1 is set to 0;
2) If the voltage-losing bus is a low-voltage side bus, the low-voltage side switch position of the transformer is set to 0;
3) And setting the standby bus switch position to 1.
And judging the bus-tie automatic switching condition, completing the bus-tie automatic switching action, realizing the automatic switching strategy under the fault condition, and completing one-round automatic switching action.
In still another embodiment of the present invention, referring to fig. 2, a schematic diagram of a power grid structure before and after a bus-tie automatic switching operation is provided in an embodiment of the present invention, a left-side sub-graph is a power grid structure before the operation, and a right-side sub-graph is a power grid structure after the operation;
after a fault, the bus 260 belongs to a voltage-loss bus set, the bus 270 belongs to a voltage bus set, the line switches 210 and 220 are connected to the bus 260, and the switch positions are 1 (combined positions); the line switches 230, 240 are connected to the bus 270 with switch positions of 1 (in-position). The bus bars 260 and 270 are connected by a bus bar switch 250, and the switch position is 0 (split).
The line connected with the switch 220 is a terminal load line and is not cut off after the spare power automatic switching action, so that the judgment mark of the 220 line switch participating in the spare power automatic switching is 0, and the judgment mark of the other switches participating in the spare power automatic switching is 1. All devices are in operation. According to the bus-tie spare power automatic switching condition, the voltage-loss bus 260 is automatically judged to meet the bus-tie spare power automatic switching condition, the position 0 of the line switch 210 connected with the bus 260 is reserved by the switch 220, the position 1 of the bus-tie switch 250 is reserved, and one-round spare power automatic switching action is completed.
Referring to fig. 3, a schematic diagram of a power grid structure before and after a low-side bus-tie automatic switching operation is provided in an embodiment of the present invention, wherein a left side sub-graph is a power grid structure diagram before the operation, and a right side sub-graph is a power grid structure diagram after the operation;
after the fault, bus 360 belongs to the set of voltage-loss buses, and bus 370 belongs to the set of voltage-loss buses. The low switch 330 is connected to the bus 360, and the switch position is 1 (on position); the low switch 340 is connected to the bus 370 with a switch position of 1 (on position); the buses 360 and 370 are connected by a bus bar switch 250, the switch position being 0 (split). All switches participate in the automatic switching judgment mark is 1. All devices are in operation. According to the judging conditions provided by the invention, the automatic judgment of the voltage-losing bus 360 accords with the bus-tie spare power automatic switching conditions, the position 0 of the low-voltage switch 330 connected with the bus 360, the position 1 of the bus-tie switch 350 and the completion of a round of spare power automatic switching action.
And if the voltage-loss bus does not have the bus-tie spare power automatic switching condition, judging that the line/main transformer becomes low-level spare power automatic switching.
In another embodiment provided by the present invention, the line backup power automatic switching condition specifically includes:
the circuit switch in operation is connected with the voltage-losing bus, the position of the circuit switch is divided, the circuit switch participates in the automatic switching judgment of the standby power to be identified as 1, and the bus on the opposite side of the circuit switch is in the latest voltage bus set;
Marking the line switch meeting the line standby automatic switching condition as a standby line switch;
the line backup automatic switching action specifically comprises the following actions of executing the following actions on a switch connected with the voltage-losing bus:
switching the switch position of the line switch participating in the automatic switching judgment mark 1 into a split position;
if the parallel operation buses exist, the positions of the line switches which are connected with the parallel operation buses and participate in the automatic switching judgment of the standby power supply are switched to be separated, wherein the parallel operation buses are as follows: a bus connected with the voltage-losing bus through a bus-connected switch with a switch position being a closing position;
and switching the switch position of the standby line switch to the closing position.
When the embodiment is implemented, if the voltage-loss bus does not meet the bus-tie automatic switching condition, the line automatic switching judgment is performed, and the line automatic switching condition is as follows:
1) The line switch in operation is connected with the voltage-losing bus;
2) The position of the line switch is 0 (split), and the judgment mark of the participation spare power automatic switching is 1;
3) The bus bars on the opposite side of the line are in a set of pressurized bus bars.
If the line spare power automatic switching condition is met, the following line spare power automatic switching operation is performed on a switch connected with the voltage-losing bus:
1) The switch position of a line switch which participates in the automatic switching judgment and is marked as 1 is set to 0;
2) If a parallel operation bus exists (namely, a bus-bar switch is connected with the bus-bar and the switch position is 1, and the bus-bar connected with the other side of the switch is the parallel operation bus-bar), the switch position of a line switch which is connected with the parallel operation bus-bar and participates in the automatic switching judgment and is marked as 1 is 0;
3) The switch position of the standby line switch is set to 1.
Referring to fig. 4, a schematic diagram of a power grid structure before and after a line backup power automatic switching operation is provided in an embodiment of the present invention, where a left side sub-graph is a power grid structure diagram before the operation, and a right side sub-graph is a power grid structure diagram after the operation; after failure, buses 460 and 470 belong to a voltage-losing bus set, the two buses operate in parallel and are connected by a bus-bar switch 450, and the switch position is 1 (combined position); the line switches 410 and 420 are connected to the bus 460, the switch position of the bus 410 is 0 (split), the switch position of the bus 420 is 1 (combined), and the bus (not shown) at the opposite end of the line to which the switch 410 belongs to a pressed bus set; the line switches 430, 440 are connected to the bus 470 with a switch position of 0 (split). The line connected with the switch 420 is a terminal load line and is not cut off after the spare power automatic switching action, so that the judgment mark of the switch 420 in the spare power automatic switching is 0, and the judgment marks of the other switches in the spare power automatic switching are 1. All devices are in operation. According to the judging conditions provided by the invention, the automatic judgment of the voltage loss bus 460 accords with the line spare power automatic switching judging conditions, the positions of the switches 430 and 440 connected with the parallel operation bus 470 are 0, the switch 420 is reserved, the position of the switch 410 is 1, and one round of spare power automatic switching operation is completed.
In another embodiment provided by the present invention, the main transformer low-power backup power automatic switching condition specifically includes:
the low-voltage bus is connected with the low-voltage bus in operation, the position of the low-voltage switch is divided, the low-voltage switch participates in the automatic standby switching judgment and is marked as 1, the bus connected at the high/medium side of the low-voltage switch is in the latest voltage bus set, and the parallel operation bus exists in the low-voltage bus, wherein the parallel operation bus is as follows: a bus connected with the voltage-losing bus through a bus-connected switch with a switch position being a closing position;
marking the line switch meeting the main transformer low-standby automatic switching condition as a standby low-standby switch;
the main transformer low-voltage automatic switching action specifically comprises the following actions of executing the following actions on a switch connected with the voltage-losing bus:
switching the switch position of the low-voltage switch connected with the parallel operation bus to be divided;
and switching the switch position of the standby low-voltage switch to the on-position.
When the embodiment is implemented specifically, if the voltage-loss bus does not meet the bus-tie spare power automatic switching condition, the main transformer low-voltage spare power automatic switching judgment is performed, and the main transformer low-voltage spare power automatic switching condition specifically includes:
1) The low-voltage switch in operation is connected with the voltage-losing bus;
2) The switch position of the low switch is 0 (split), and the participation spare power automatic switching judgment mark is 1;
3) The high/middle side connecting bus is arranged in the pressed bus set;
4) A parallel operation bus exists (namely, a bus-bar switch is connected with the bus bar and the switch position of the switch is 1, and the bus bar connected with the other side of the switch is the parallel operation bus bar);
if the main transformer low-power-supply automatic switching condition is met, performing the following main transformer low-power-supply automatic switching operation on a switch connected with a voltage-loss bus:
1) The switch position 0 of the low switch connected with the parallel operation buses is set;
2) Setting the switch position 1 of the standby low-voltage switch;
referring to fig. 5, a schematic diagram of a power grid structure before and after a main transformer low-power backup automatic switching action is provided in an embodiment of the present invention, a left side sub-graph is a power grid structure diagram before the action, and a right side sub-graph is a power grid structure diagram after the action;
after a fault, the low-side buses 560 and 570 belong to a voltage-losing bus set, the two buses run in parallel and are connected by a bus-bar switch 550, and the switch position is 1 (combined position); the low switch 530 is connected to the bus 560 with a switch position of 1 (on position); the low-voltage switch 540 is connected to the bus 570 with a switch position of 0 (split), the low-voltage side of the transformer 520 is connected to the low-voltage switch 540, and the bus (not shown) connected to the high-voltage side belongs to a set of voltage buses. All switches participate in the automatic switching judgment mark is 1. All devices are in operation. According to the judging conditions provided by the invention, the automatic judgment voltage-losing bus 570 meets the main transformer low-standby automatic switching conditions, the position 0 of the low switch 530 connected with the parallel operation bus 560 is set, the position 1 of the low switch 540 is set, and one-round standby automatic switching operation is completed.
In still another embodiment of the present invention, referring to fig. 6, a flow chart of a static analysis method for power grid faults including a spare power automatic switching strategy according to another embodiment of the present invention is shown; the method comprises the following steps:
s601: acquiring basic data of a power grid;
s602: configuring switch data;
s603: adjusting the running state of the element according to the fault information;
s604: judging a pressed bus set and a voltage-losing bus set by calculating the shortest path matrix of the operation bus;
s605: judging whether the voltage-loss busbar set is empty or not:
if not, executing step S606; if yes, go to step S612;
s606: traversing a voltage-loss busbar set;
s607: judging whether the voltage-loss bus meets the bus-tie spare power automatic switching condition or not;
if yes, go to step S608; if not, go to step S609;
s608: performing bus-tie spare power automatic switching operation on the related switch, and executing step S604;
s609: judging whether the voltage-loss bus meets the line/main transformer low-standby automatic switching condition or not;
if yes, go to step S610; if not, go to step S611;
s610: performing line/main transformer low-power automatic switching operation on the related switch, and executing step S604;
s611: after the traversal is finished, any bus does not meet the automatic standby switching judgment condition
S612: generating load flow calculation data according to the latest obtained pressurized busbar set, and calculating load flow distribution after faults;
and the overload condition of the power grid after the fault is analyzed according to the calculation result, so that the efficiency and accuracy of the power grid analysis are improved, and the fault maintenance is facilitated.
The method is characterized in that the automatic switching of the line spare power and the automatic switching of the main transformer are synchronously performed after the automatic switching of the bus-tie spare power, and when the condition of the automatic switching of the line spare power is met, the operation of the automatic switching of the line spare power is performed; when the condition of the automatic switching of the main transformer to the low-power standby is met, the automatic switching operation of the main transformer to the low-power standby is carried out;
and in the process of traversing the voltage-losing busbar set, after the busbar meets the busbar automatic switching or the line/main transformer low-voltage automatic switching condition and corresponding switching operation is carried out, the busbar automatic switching is regarded as completing one-round automatic switching action.
Summing the bus active loads of the voltage-losing bus set, and counting the fault loss load quantity; and summing the number of users, and counting the number of fault loss users. And evaluating the fault event level according to the power grid operation related standard.
According to the pressurized bus set and the topological relation, combining with power grid basic information data, referring to a data format of power system calculation analysis software DSP or BPA, generating a power flow calculation data dat file, calling the DSP or BPA to perform power flow calculation on the dat file, and analyzing the power grid overload condition after the faults of the spare power automatic switching action are considered.
According to the power grid fault static analysis method comprising the automatic backup power switching strategy, the problem that the automatic backup power switching action cannot be considered by calculation and analysis software of an existing power system is solved, and the method is different from the existing technical means of manually maintaining the automatic backup power switching fixed value list.
The invention provides a power grid fault static analysis method comprising a spare power automatic switching strategy, which comprises the following steps: firstly, configuring switch data in basic data of a power grid as a basis for identifying a spare power automatic switching strategy; according to the studied faults, fault information is obtained, the running state information of the power grid element is adjusted, and the power grid topological relation is updated; judging a pressed bus set and a voltage-losing bus set according to the topological relation of the power grid after the faults; automatically identifying the spare power automatic switching action strategy of the connected switch in the voltage-losing bus set and adjusting the switch position; carrying out the judgment of the step-down bus set and the automatic standby switching action processing again on the updated power grid topological relation until no step-down bus exists in the power grid or the connected switches in the step-down bus set do not meet the automatic standby switching condition; and carrying out load flow calculation according to the pressurized busbar set and the topological relation thereof, and analyzing the overload condition of the power grid after the fault. The automatic backup power switching strategy under the current operation mode can be automatically identified, the action condition of the fault backup power switching can be judged, the topology of the power grid can be adjusted, and the efficiency and the accuracy of power grid analysis can be improved.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (8)
1. The utility model provides a power grid fault static analysis method comprising a spare power automatic switching strategy, which is characterized in that the method comprises the following steps:
basic data and fault data of a power grid are obtained, and switching data are configured in the basic data to obtain a power grid topological relation;
adjusting the running state information of the power grid according to the fault data, and updating the topological relation of the power grid;
judging an initial set of voltage buses and a set of voltage-losing buses of the power grid according to the updated power grid topological relation;
when the initial voltage-losing bus set of the power grid is not empty, selecting a voltage-losing bus from the initial voltage-losing bus set of the power grid to judge the spare power automatic switching condition, performing spare power automatic switching action processing according to a judging result, and updating the voltage-losing bus set and the voltage-losing bus set of the power grid;
when the updated voltage-losing busbar set is empty, generating power flow calculation data according to the latest obtained voltage-losing busbar set, calculating power flow distribution after faults, and analyzing overload conditions of the power grid after the faults;
When the updated voltage-losing bus set is not empty, selecting a voltage-losing bus from the updated voltage-losing bus set to carry out spare power automatic switching condition judgment, carrying out spare power automatic switching action processing according to a judging result, updating the voltage-losing bus set and the voltage-losing bus set of the power grid again, judging the latest obtained voltage-losing bus set until the latest obtained voltage-losing bus set is empty or any voltage-losing bus in the latest obtained voltage-losing bus set does not meet the spare power automatic switching condition;
generating load flow calculation data according to the latest obtained pressurized busbar set, calculating load flow distribution after faults, and analyzing overload conditions of the power grid after the faults;
the spare power automatic switching condition comprises: bus-tie automatic switching conditions, line automatic switching conditions and main transformer low-voltage automatic switching conditions;
selecting a voltage-losing bus from an initial voltage-losing bus set of the power grid to judge the spare power automatic switching condition, performing spare power automatic switching action processing according to a judging result, and updating the voltage-losing bus set and the voltage-losing bus set of the power grid, wherein the method specifically comprises the following steps:
selecting a voltage-loss bus from the voltage-loss bus set to judge the spare power automatic switching condition;
judging whether the voltage-losing bus meets the bus-tie spare power automatic switching condition or not, if the voltage-losing bus meets the bus-tie spare power automatic switching condition, performing bus-tie spare power automatic switching on a switch connected with the voltage-losing bus, and updating a voltage bus set and a voltage-losing bus set of a power grid;
If the voltage-losing bus does not meet the bus-tie automatic switching condition, judging whether the voltage-losing bus meets the line automatic switching condition, and if the voltage-losing bus meets the line automatic switching condition, performing line automatic switching on a switch connected with the voltage-losing bus, and updating a voltage bus set and a voltage-losing bus set of a power grid;
if the voltage-losing bus does not meet the bus-to-bus automatic switching condition, judging whether the voltage-losing bus meets the main transformer low-voltage automatic switching condition, and if the voltage-losing bus meets the main transformer low-voltage automatic switching condition, performing main transformer low-voltage automatic switching on a switch connected with the voltage-losing bus, and updating a voltage bus set and a voltage-losing bus set of a power grid.
2. The method for static analysis of power grid faults including a backup power automatic switching strategy of claim 1, further comprising:
when the initial voltage-losing bus set of the power grid is empty, generating power flow calculation data according to the initial voltage-losing bus set of the power grid, calculating power flow distribution after faults, and analyzing overload conditions of the power grid after the faults.
3. The method for static analysis of power grid faults including a backup power automatic switching strategy as claimed in claim 1, wherein the power grid base data comprises: calculating parameters of a power grid element, the running state of the power grid element, a power grid topological relation, generator output basic data and generator load basic data;
The configuration switch data is to add switch parameters related to spare power automatic switching in the power grid basic data, and specifically includes: the switch type, bus information on two sides of the switch, the switch position and the switch participate in the automatic switching judgment mark.
4. The static analysis method for power grid faults including the spare power automatic switching strategy according to claim 1, wherein the operation state information of the power grid is adjusted according to the fault information, and the power grid topological relation is updated specifically as follows:
switching the operation state of a fault element of the power grid into an exit state according to fault information in the power grid, wherein the fault information is specifically a single fault or a plurality of simultaneous faults of the power grid element, and the power grid element comprises: lines, transformers, and bus bars.
5. The static analysis method for power grid faults including the spare power automatic switching strategy according to claim 1, wherein the distinguishing of the set of the voltage buses and the set of the voltage loss buses of the power grid according to the updated power grid topological relation specifically comprises the following steps:
generating an undirected and unowned n×n adjacency matrix a according to the updated power grid topology, wherein matrix element a ij The connection relation between the bus i and the bus j is shown, wherein if the bus i and the bus j are directly connected, A is as follows ij =1; if the bus i and the bus j are not directly connected, A ij =0；
Carrying out shortest path calculation on the adjacent matrix A by adopting a Floyd algorithm to obtain a shortest path matrix P, wherein matrix elements P are obtained by adopting a matrix element P ij Representing the path length from busbar i to busbar j, 0<i≤n，0<j≤n ；
Transforming shortest path matrix P into a blocking matrix by simple matrix transformationWherein the blocking matrix U corresponds to the elements of the voltage busbar set, and the blocking matrix V corresponds to the elements of the voltage-losing busbar set;
and judging a set of voltage buses and a set of voltage-losing buses in the power grid according to the numbers of the matrix elements.
6. The method for static analysis of power grid faults comprising a backup power automatic switching strategy according to claim 1, wherein the bus-tie backup power automatic switching condition specifically comprises:
the bus-bar switch in operation is connected with the voltage-losing bus, the position of the bus-bar switch is divided, the bus-bar switch participates in the spare power automatic switching judgment and is identified as 1, and the bus on the opposite side of the bus-bar switch is in the latest voltage bus set;
marking the bus-tie switch meeting the bus-tie spare power automatic switching condition as a spare bus-tie switch;
the bus-bar automatic switching action specifically comprises the following actions of executing the following actions on a switch connected with the voltage-losing bus:
Switching the switch position of the line switch participating in the automatic switching judgment mark 1 into a split position;
when the voltage-losing bus is a low-voltage side bus, switching the switch position of a low-voltage side switch of a transformer of the low-voltage side bus into a split position;
and switching the switch position of the standby bus-tie switch into the closing position.
7. The method for static analysis of power grid faults including a spare power automatic switching strategy according to claim 1, wherein the line spare power automatic switching condition specifically comprises:
the circuit switch in operation is connected with the voltage-losing bus, the position of the circuit switch is divided, the circuit switch participates in the automatic switching judgment of the standby power to be identified as 1, and the bus on the opposite side of the circuit switch is in the latest voltage bus set;
marking the line switch meeting the line standby automatic switching condition as a standby line switch;
the line backup automatic switching action specifically comprises the following actions of executing the following actions on a switch connected with the voltage-losing bus:
switching the switch position of the line switch participating in the automatic switching judgment mark 1 into a split position;
if the parallel operation buses exist, the positions of the line switches which are connected with the parallel operation buses and participate in the automatic switching judgment of the standby power supply are switched to be separated, wherein the parallel operation buses are as follows: a bus connected with the voltage-losing bus through a bus-connected switch with a switch position being a closing position;
And switching the switch position of the standby line switch to the closing position.
8. The method for static analysis of power grid faults including the backup power automatic switching strategy according to claim 7, wherein the main transformer low-backup power automatic switching condition specifically comprises:
the low-voltage bus is connected with the low-voltage bus in operation, the position of the low-voltage switch is divided, the low-voltage switch participates in the automatic standby switching judgment and is marked as 1, the bus connected at the high/medium side of the low-voltage switch is in the latest voltage bus set, and the parallel operation bus exists in the low-voltage bus, wherein the parallel operation bus is as follows: a bus connected with the voltage-losing bus through a bus-connected switch with a switch position being a closing position;
marking the line switch meeting the main transformer low-standby automatic switching condition as a standby low-standby switch;
the main transformer low-voltage automatic switching action specifically comprises the following actions of executing the following actions on a switch connected with the voltage-losing bus:
switching the switch position of the low-voltage switch connected with the parallel operation bus to be divided;
and switching the switch position of the standby low-voltage switch to the on-position.
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