CN112597624A - Power distribution network power failure simulation analysis method and system based on equipment topological relation - Google Patents
Power distribution network power failure simulation analysis method and system based on equipment topological relation Download PDFInfo
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Abstract
The invention discloses a power distribution network power failure simulation analysis method and system based on an equipment topological relation, which comprises the following steps: acquiring source point equipment information of the power failure simulation; performing single-source breadth tracking on a topological network from source point equipment according to the source point equipment information to obtain all power supplies for supplying power to the source point equipment and all encountered distribution transformers; performing multi-source tracking on a topology network from a plurality of power supplies to obtain all the encountered live transformers; all live transformers are deleted from the plurality of distribution transformers, and the rest are uncharged distribution transformers. The invention can obviously improve the comprehensiveness and accuracy of the power failure range determination.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a power distribution network power failure simulation analysis method and system based on an equipment topological relation.
Background
At present, a power distribution network equipment database is generally established in the technical field of power systems, and equipment attribute data such as identification numbers and equipment types of power distribution network equipment, geographical information such as geographical positions, trends and directions, and topological information such as connection relations and switch states among equipment are generally stored in the database. When determining the power distribution blackout range, the blackout range can be determined by reading the data in the database. The power distribution network management system is developed by utilizing the power distribution network equipment database, the spatial information and the attribute data of the power distribution network equipment can be displayed on a visual graphical interface, and the auxiliary decision-making service is carried out for various requirements of power distribution network management.
When a power failure plan is formulated, the power failure can be previewed through power distribution network power failure simulation analysis. The distribution network power failure simulation analysis is based on power grid topology information, and by simulating the operation of opening or closing a designated switch, the users and equipment influenced by the disconnected switch are analyzed, electrified and uncharged equipment is distinguished on a graph by different colors, and a list of the power failure equipment and the users is displayed at the same time. In a power distribution network, one power source supplies power to multiple end users, while some important users and devices may have multiple power points supplying power to them. The real-time status of the plurality of tie switches is considered when determining the blackout range. Due to the complexity of the electrical connection, it is easy to determine a power failure point when simulating a power failure, but it is troublesome to determine the power failure boundary quickly and accurately.
At present, domestic documents mainly propose a method for searching according to power failure information and power grid topology, generally, a power failure range can be positioned according to the power grid topology, but a complete scheme does not exist, and a solution for analyzing a power failure model can be simply and conveniently carried out. For how to determine the blackout boundary, some solutions are to let the user select one power point, but for the case where the initial blackout point is not the power point of the current grid link, and no solution is given across the power supply area. Some devices are connected with the topological island for analysis, and the topological island is corrected by judging the influence of switch displacement on the number of topological nodes, so that detailed description is not sufficient. Some schemes need to maintain a topological model, and for some real-time equipment states or multiple times of simulation, a database needs to be repeatedly modified, so that the real-time performance is not high. Although there is also a determination of the power failure boundary, in this scheme, tracking to the transformer in the power supply direction is far, and no consideration is given to the real-time state of the switch.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a power distribution network power failure simulation analysis method and system based on an equipment topological relation, so as to solve the problems of insufficient comprehensiveness and accuracy in power failure range determination in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a power distribution network power failure simulation analysis method based on an equipment topological relation comprises the following steps:
acquiring source point equipment information of the power failure simulation;
performing single-source breadth tracking on a topological network from source point equipment according to the source point equipment information to obtain all power supplies for supplying power to the source point equipment and all encountered distribution transformers;
performing multi-source tracking on a topology network from a plurality of power supplies to obtain all the encountered live transformers;
all live transformers are deleted from the plurality of distribution transformers, and the rest are uncharged distribution transformers.
Further, the single-source breadth tracking process includes:
searching each topological branch connected with the source point equipment by taking the source point equipment as a starting point;
and judging whether to continue searching the branch of the source point equipment according to the searched equipment attribute.
Further, the method for determining whether to continue searching for the branch of the source point device according to the attribute of the device is as follows:
for each topology branch of the source point equipment, if the searched equipment is a bus, judging whether the voltage level of the bus is different from that of a power station to which the bus belongs, if so, stopping the search of the corresponding topology branch, taking the previous equipment of the bus as a power supply, and if so, continuing the search;
if the searched equipment is a transformer, stopping searching of the corresponding topology branch;
if the searched equipment is the normally open contact switch, judging whether the normally open contact switch is in the closed switch list, if so, continuing searching, and if not, stopping searching of the corresponding topology branch;
if the searched equipment is power equipment except a bus, a transformer or a normally open contact switch, the search is continued.
Further, the multi-source tracking method comprises the following steps:
searching each topological branch connected with the power supply by taking the power supply as a starting point;
and judging whether to continue searching for the branch of the power supply according to the searched attribute of the equipment.
Further, the method for judging whether to continue searching for the branch of the power supply according to the attribute of the equipment comprises the following steps:
for each topology branch of the power supply, if the searched equipment is a bus, judging whether the voltage level of the bus is different from that of a power station to which the bus belongs, if so, stopping the search of the corresponding topology branch, and if so, continuing the search;
if the searched equipment is a transformer, stopping searching of the corresponding topology branch;
if the searched equipment is a switch, judging whether the switch is in a closed switch list, if so, continuing searching, and if not, stopping searching of the corresponding topology branch;
if the searched equipment is power equipment except a bus, a transformer or a switch, the search is continued.
Further, the source device information includes a source device type and a source device ID.
A power distribution network power failure simulation analysis system based on equipment topological relation, the system comprises:
an acquisition module: the system comprises a power source point device, a power source point device and a power source control device, wherein the power source point device is used for acquiring source point device information of a power failure;
a single source tracking module: the system comprises a source point device, a topology network and a power supply, wherein the source point device is used for carrying out single-source breadth tracking on a topological network from the source point device according to the source point device information to obtain all power supplies for supplying power to the source point device and all encountered distribution transformers;
the multi-source tracking module: the method is used for carrying out multi-source tracking on a topological network from a plurality of power supplies and obtaining all the encountered live transformers;
a deletion module: the method is used for deleting all the live transformers from a plurality of distribution transformers, and the rest are the distribution transformers without electricity.
A power distribution network power failure simulation analysis system based on equipment topological relation comprises a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate according to the instructions to perform the steps of the method described above.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method described above.
Compared with the prior art, the invention has the following beneficial effects:
according to the method, no additional power supply point is required, and the analysis is carried out to obtain the power supply point in real time, so that a relatively complete analysis result can be obtained aiming at the conditions that initial power failure equipment is not provided with a power supply, cross-power supply and multi-power supply, and the comprehensiveness and accuracy of determining the power failure range are obviously improved; the real-time setting information of the switches is considered, the notification deflection of the switches can be processed simultaneously, the real-time switch state is brought into the analysis process for calculation, and a relatively accurate analysis result can be obtained; the analog switch state is considered, storage and repeated modification in a database are not needed, analog and real-time switch state data do not need to be maintained independently, and efficiency is improved.
Drawings
FIG. 1 is a flow chart of a method of determining a blackout range;
FIG. 2 is a flowchart of a first tracking method for determining a blackout range according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a second tracking method for determining a blackout range according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings. It should be understood that the following embodiments are provided only for the purpose of thoroughly and completely disclosing the present invention and fully conveying the technical concept of the present invention to those skilled in the art, and the present invention may be embodied in many different forms and is not limited to the embodiments described herein. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention.
As shown in fig. 1, 2 and 3, a power failure simulation analysis method for a power distribution network based on an equipment topology relationship includes the following steps:
step 1: constructing an initial query condition according to user input data, preparing for topology tracking, wherein the necessary condition is a source point device simulating power failure, and the selectable condition is a switch list needing to be disconnected and a switch list needing to be closed in a power grid; the various input devices are power grid devices selected and designated from a map in a graphical interface system through a mouse, source point device types and device IDs can be searched in a database according to the obtained topology to serve as starting point devices for analysis, and a switch list needing to be opened and a switch list needing to be closed can also be inquired.
Step 2: tracking for the first time, and tracking the single-source extent on the equipment topology network from the source point equipment which is supposed to have power failure; collecting all power supplies supplying power to source point equipment with power failure simulation in the tracking process as search sources of subsequent steps, and collecting all encountered distribution transformers; in the tracking process, each searched device is respectively judged to determine whether to record the device, whether to continue searching for other devices connected with the device or stop subsequent searching of the device, which is specifically as follows:
if the searched equipment is a bus and the voltage grade of the bus is different from that of the power station to which the bus belongs, the bus is a medium-voltage side bus of the substation and is a power supply of the current branch, at the moment, the branch is not searched continuously, the previous equipment of the bus is taken as the power supply to be recorded and added into a power supply list, and if the voltage grade of the bus is the same as that of the power station to which the bus belongs, the bus is a power distribution station; note that the previous device on the bus on this supply link is used as a power source, since other outgoing lines that may be present on the bus may lead to tracing to another distribution network, affecting the result;
if the searched equipment is a transformer, recording the distribution transformer, adding the distribution transformer into a transformer list, and stopping the search branch;
if the device searched is a switch and is a normally open tie switch: if the switch is in the closed switch list, the tracing path is regarded as no obstruction, and the process is continued without direction; otherwise, as a normally open switch, the search branch is not continued;
if the searched device does not meet the above condition or is other power device, the search is continued.
Tracking for the first time, reading the corresponding attribute of the equipment according to the equipment type, carrying out corresponding operation on the equipment meeting the condition, and determining whether the topological branch needs to continue; through the judgment of different equipment types, if the branch needs to be tracked continuously, other equipment connected with the equipment is added into a list to be tracked, and then one equipment is taken out from the list to be tracked for judgment; and repeatedly continuing to track until no equipment exists in the equipment list to be tracked.
During tracking of the step, all devices which can be connected together through a switch are started from source point devices to be powered off, all power supplies for supplying power to the source point devices to be powered off are collected to be used as search sources of subsequent steps, and in addition, all distribution transformers encountered during tracking are possible power-off devices and all distribution transformers are collected.
Step 3: tracking for the second time, starting from a plurality of power supplies obtained by tracking for the first time, performing multi-source tracking, and screening and deleting the tracked electrified distribution transformers from the distribution transformer list; in the tracking process, each searched device is determined to determine whether the device is the device to be found, whether to continue searching for other devices connected to the device or to stop subsequent searching for the device, which is specifically as follows:
if the searched equipment is a bus, the voltage grade of the bus is different from that of the power station to which the bus belongs, the bus is used as a power supply of the current tracking path, and the search is not continued;
if the searched device is a distribution transformer, the distribution transformer is removed from the list because the device is traced from the power supply, and the tracing indicates that the transformer is electrified;
if the searched equipment is a switch, judging according to the situation: if the switch is located in the closed switch list, the switch is considered to be closed, and then the line behind the switch is searched continuously; if the switch is a normally open switch or an open switch, a subsequent path is not directly searched;
if the searched device does not meet the above conditions or is other device, the search is continued.
The second tracking, starting from a plurality of power supplies obtained by the first tracking, performing multi-source tracking, reading corresponding attributes of the equipment according to the type of the equipment when tracking the equipment, performing corresponding operation on the equipment meeting the conditions, and determining whether the topological branch needs to continue; through the judgment of different equipment types, if the branch needs to be tracked continuously, other equipment connected with the equipment is added into a list to be tracked, and then one equipment is taken out from the list to be tracked for judgment; and repeatedly continuing to track until no equipment exists in the equipment list to be tracked.
This step is tracked taking into account the switch state, and the distribution transformers encountered are necessarily live, and are removed from the list of transformers generated in the previous step.
Step 4: after the two tracking operations are completed, the remaining distribution transformers in the transformer list are the uncharged distribution transformers affected by the power failure.
When the first-time tracking is carried out according to logic, the closing state of a switch is mainly considered, a power supply which is found from a source point device which plans to cut off power is a power supply which can supply power to the point, and a found transformer is a distribution transformer which is possibly influenced by the cut off power; when the second tracking is carried out according to logic, the disconnection state of the switch is mainly considered, and the transformer found from the power supply point is a distribution transformer supplied with power by the power supply point and is live equipment; and (4) integrating the results of the two tracking times, and eliminating the electrified transformer obtained by the second tracking time from the transformer list obtained by the first tracking time, wherein the transformer influenced by power failure is remained.
The previous device on the bus on the power supply link is used as a power supply to be added into the power supply list, so that the diffusion of the tracking path caused by the second tracking can be avoided.
When topology tracking analysis is carried out, the medium-voltage side bus of the transformer substation is tracked in the power supply direction, the distribution transformer is tracked in the power receiving direction, the disconnected interconnection switch is tracked in other directions, tracking of the path is stopped, and the tracking range can be prevented from being enlarged.
The method is characterized in that topology tracking is performed twice by combining the on-off state based on power grid topology information, single-source wide tracking is performed by starting from a power failure device for the first time, all power supply sources and distribution transformers are collected and recorded, multi-source tracking is performed by starting from the power supply source with the first tracking result for the second time, the tracked distribution transformers are screened and deleted from the distribution transformer list, and the power failure device is remained in the list.
A power distribution network power failure simulation analysis system based on equipment topological relation, the system comprises:
an acquisition module: the system comprises a power source point device, a power source point device and a power source control device, wherein the power source point device is used for acquiring source point device information of a power failure;
a single source tracking module: the system comprises a source point device, a topology network and a power supply, wherein the source point device is used for carrying out single-source breadth tracking on a topological network from the source point device according to the source point device information to obtain all power supplies for supplying power to the source point device and all encountered distribution transformers;
the multi-source tracking module: the method is used for carrying out multi-source tracking on a topological network from a plurality of power supplies and obtaining all the encountered live transformers;
a deletion module: the method is used for deleting all the live transformers from a plurality of distribution transformers, and the rest are the distribution transformers without electricity.
A power distribution network power failure simulation analysis system based on equipment topological relation comprises a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate according to the instructions to perform the steps of the method described above.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method described above.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (9)
1. A power distribution network power failure simulation analysis method based on an equipment topological relation is characterized by comprising the following steps:
acquiring source point equipment information of the power failure simulation;
performing single-source breadth tracking on a topological network from source point equipment according to the source point equipment information to obtain all power supplies for supplying power to the source point equipment and all encountered distribution transformers;
performing multi-source tracking on a topology network from a plurality of power supplies to obtain all the encountered live transformers;
all live transformers are deleted from the plurality of distribution transformers, and the rest are uncharged distribution transformers.
2. The power distribution network power failure simulation analysis method based on the equipment topological relation, according to claim 1, characterized in that the single-source breadth tracking process comprises:
searching each topological branch connected with the source point equipment by taking the source point equipment as a starting point;
and judging whether to continue searching the branch of the source point equipment according to the searched equipment attribute.
3. The method for power failure simulation analysis of the power distribution network based on the topological relation of the equipment as claimed in claim 2, wherein the method for judging whether to continue searching for the branch of the source point equipment according to the attribute of the equipment is as follows:
for each topology branch of the source point equipment, if the searched equipment is a bus, judging whether the voltage level of the bus is different from that of a power station to which the bus belongs, if so, stopping the search of the corresponding topology branch, taking the previous equipment of the bus as a power supply, and if so, continuing the search;
if the searched equipment is a transformer, stopping searching of the corresponding topology branch;
if the searched equipment is the normally open contact switch, judging whether the normally open contact switch is in the closed switch list, if so, continuing searching, and if not, stopping searching of the corresponding topology branch;
if the searched equipment is power equipment except a bus, a transformer or a normally open contact switch, the search is continued.
4. The power failure simulation analysis method for the power distribution network based on the equipment topological relation, according to claim 1, is characterized in that the multi-source tracking method comprises the following steps:
searching each topological branch connected with the power supply by taking the power supply as a starting point;
and judging whether to continue searching for the branch of the power supply according to the searched attribute of the equipment.
5. The method for power failure simulation analysis of the power distribution network based on the topological relation of the equipment as claimed in claim 4, wherein the method for judging whether to continue searching for the branch of the power supply according to the attribute of the equipment is as follows:
for each topology branch of the power supply, if the searched equipment is a bus, judging whether the voltage level of the bus is different from that of a power station to which the bus belongs, if so, stopping the search of the corresponding topology branch, and if so, continuing the search;
if the searched equipment is a transformer, stopping searching of the corresponding topology branch;
if the searched equipment is a switch, judging whether the switch is in a closed switch list, if so, continuing searching, and if not, stopping searching of the corresponding topology branch;
if the searched equipment is power equipment except a bus, a transformer or a switch, the search is continued.
6. The power distribution network power failure simulation analysis method based on the device topology relationship as claimed in claim 1, wherein the source device information includes a source device type and a source device ID.
7. A distribution network power failure simulation analysis system based on equipment topological relation is characterized by comprising:
an acquisition module: the system comprises a power source point device, a power source point device and a power source control device, wherein the power source point device is used for acquiring source point device information of a power failure;
a single source tracking module: the system comprises a source point device, a topology network and a power supply, wherein the source point device is used for carrying out single-source breadth tracking on a topological network from the source point device according to the source point device information to obtain all power supplies for supplying power to the source point device and all encountered distribution transformers;
the multi-source tracking module: the method is used for carrying out multi-source tracking on a topological network from a plurality of power supplies and obtaining all the encountered live transformers;
a deletion module: the method is used for deleting all the live transformers from a plurality of distribution transformers, and the rest are the distribution transformers without electricity.
8. A power distribution network power failure simulation analysis system based on equipment topological relation is characterized by comprising a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of claims 1 to 6.
9. Computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
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