CN113378392A - New load access reliability analysis method, system, device and storage medium - Google Patents
New load access reliability analysis method, system, device and storage medium Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The invention discloses a method, a system, a device and a storage medium for analyzing the reliability of new load access, wherein the method comprises the following steps: calling a power distribution network frame model of an area to be analyzed from a power information system to obtain a power distribution network topological structure; extracting all element equipment information in a distribution network in an area to be analyzed from a distribution network topological structure; traversing all element equipment information in the area to be analyzed, and determining a key element and a non-key element; taking the key elements as the center, combining the non-key elements of the power distribution network to form an elastic power distribution network structure; and analyzing the node voltage and the tide distribution condition after the new load is accessed based on the elastic power distribution network structure to obtain the reliability result of the power distribution network accessed by the new load. The invention carries out elastic refinement on the basis of the original power distribution network topology, so that the power distribution network structure is greatly simplified.
Description
Technical Field
The invention belongs to the technical field of power distribution networks, and particularly relates to a method, a system, a device and a storage medium for analyzing the reliability of new load access.
Background
In the operation process of the power distribution network, the situation that loads are connected into or quit from nodes of the power distribution network easily occurs, the topological structure of the power distribution network is changed, the power flow of the power distribution network changes, and the operation state of the power distribution network needs to be efficiently evaluated. Especially, when a large new load is connected to a node of the power distribution network, the situations that the power distribution network is influenced by insufficient local power supply amount, voltage reduction and the like are easily caused, and the power distribution network runs reliably and efficiently.
The current main technology is as follows: new load access reliability analysis relates to distribution network state evaluation. The current power distribution network state evaluation mostly utilizes redundant information to estimate the running state of a power distribution network, and when the power distribution network information is insufficient or available data is insufficient, existing measurement values are mostly utilized to calculate pseudo-measurement, so that the function of expanding the available power distribution network state evaluation data is achieved. The method of adding the pseudo measurement is beneficial to increasing the state evaluation range of the power distribution network, but increases the operation workload and is easy to reduce the state evaluation precision.
Disclosure of Invention
The invention aims to provide a new load access reliability analysis method, a system, a device and a storage medium, which aim to solve the problems that in the prior art, the operation workload is increased by adding a pseudo-measurement method, and the state evaluation precision is easily reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a new load access reliability analysis method comprises the following steps:
calling a power distribution network frame model of an area to be analyzed from a power information system to obtain a power distribution network topological structure;
extracting all element equipment information in a distribution network in an area to be analyzed from a distribution network topological structure;
traversing all element equipment information in the area to be analyzed, and determining a key element and a non-key element;
taking the key elements as the center, combining the non-key elements of the power distribution network to form an elastic power distribution network structure;
and analyzing the node voltage and the tide distribution condition after the new load is accessed based on the elastic power distribution network structure to obtain the reliability result of the power distribution network accessed by the new load.
Further, the key elements are: the method comprises the following steps that an outlet circuit breaker, a load distribution transformer and a new load access point node for measuring collection quantity in the power distribution network are used;
component devices other than critical components are considered non-critical components.
Furthermore, by taking a key element as a center, combining non-key elements of the power distribution network to form an elastic power distribution network structure, the specific method is as follows:
calling a power distribution network topological structure of an area to be analyzed, classifying the element equipment according to the power distribution network topological structure and port properties of the element equipment, and determining terminal equipment;
traversing all terminal equipment in a power distribution network topological structure, and judging whether the terminal equipment is a non-key element;
if the terminal equipment is a non-key element, judging whether a previous node of the terminal equipment is the non-key element, if the previous node is the key element, not performing node combination operation, and restarting to judge whether a current node is the non-key element by a next node of the key element; if the previous node of the terminal equipment is a non-key element, merging the information of the node where the terminal equipment is located and the previous node of the terminal equipment into the previous node of the terminal equipment to form a refined node, regarding the refined node as a non-key element, and continuing node merging operation on the latest refined node until two connected non-key element nodes do not exist to form an elastic power distribution network structure;
and if the terminal equipment is a key element, not performing node combination operation, and judging whether the terminal equipment is a non-key element again by the next node of the terminal equipment.
Further, the element device is located at the end of the power distribution network topology, and the device is determined to be an end device only if one port exists.
Further, based on the elastic distribution network structure, analyzing the distribution condition of node voltage and power flow after the load is newly connected, specifically as follows:
based on the elastic power distribution network structure, carrying out power distribution network load flow calculation by adopting a PQ decomposition method to obtain node voltage and load flow distribution conditions;
and analyzing the voltage and load conditions of the power distribution network node after the new load is accessed according to the node voltage and load distribution conditions, thereby mastering the reliability condition of the power distribution network after the new load is accessed.
The other technical scheme provided by the invention is as follows:
a system for a new load access reliability analysis method, comprising:
the system comprises a first module, a second module and a third module, wherein the first module is used for calling a power distribution network frame model of an area to be analyzed from a power information system to obtain a power distribution network topological structure;
the second module is used for extracting all element equipment information in the distribution network of the area to be analyzed from the topological structure of the distribution network;
the third module is used for traversing all element equipment information in the area to be analyzed and determining a key element and a non-key element;
the fourth module is used for combining non-key elements of the power distribution network by taking the key elements as the center to form an elastic power distribution network structure;
and the fifth module is used for analyzing the node voltage and the load flow distribution condition after the new load is accessed based on the elastic power distribution network structure to obtain the reliability result of the power distribution network accessed by the new load.
The invention provides another technical scheme that:
an apparatus for a new load access reliability analysis method includes a memory and a processor;
the memory for storing a computer program; the processor is configured to implement the new load access reliability analysis method when executing the computer program.
The invention provides another technical scheme that:
a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the new load access reliability analysis method.
The invention has the following beneficial effects:
1. the method is used for evaluating the stability of the power distribution network based on the topological elastic shrinkage of the key elements after the new load is accessed, and compared with the existing power grid evaluating method by adding pseudo measurement, the method has the characteristics of small calculated amount and high operation speed.
2. The invention fully utilizes the distribution network architecture diagram in the power system, performs elastic refinement on the basis of the original distribution network topology, greatly simplifies the distribution network structure, and simultaneously can develop the distribution network visualization technology on the basis.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram illustrating a principle of a new load access reliability analysis method according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a non-critical node merging principle in the embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
As shown in fig. 1, an embodiment of the present invention provides a new load access reliability analysis method, which determines a key component and a non-key component, and combines the non-key components with the key component as a center to form an elastic power distribution network structure with topology refinement and a small computation amount; based on the elastic power distribution network structure, the power flow situation after the new load is accessed is analyzed, and therefore the reliability of the power distribution network accessed by the new load is evaluated. The method specifically comprises the following steps:
and S1, calling a power distribution network frame model of the area to be analyzed from the power information system to obtain a power distribution network topological structure.
And S2, extracting all element equipment information in the distribution network of the area to be analyzed from the distribution network topological structure, wherein the element equipment information comprises information of element equipment such as transformers and switches.
S3, traversing all element equipment information in the area to be analyzed, and determining a key element and a non-key element; in the embodiment, key elements assign the power distribution equipment with complete acquired information and higher accuracy of the acquired measurement in the power grid, and the power distribution equipment mainly comprises an export breaker for measuring the acquired measurement, a load distribution transformer and a new load access point node; and devices other than the critical elements are considered non-critical elements.
S4, combining non-key elements of the power distribution network by taking the key elements as a center to form an elastic power distribution network structure; as shown in fig. 2.
S41, calling a power distribution network topological structure of the area to be analyzed, classifying the element equipment according to the power distribution network topological structure and the port properties of the element equipment, and determining the terminal equipment, wherein the method specifically comprises the following steps:
1) the element equipment is positioned at the tail end of the topological structure of the power distribution network, and the node only has one port and is judged as the tail end equipment;
2) the node where the element equipment is located has two ports, and the equipment is judged to be two-port equipment;
3) if the node where the element device is located has three ports and more than three ports, the device is determined to be a multi-port device.
S42, the power distribution network topology structure of the area to be analyzed is called, and all terminal devices of the power distribution network topology structure are traversed.
S43, making a logic judgment on the end device of step S42 as to whether the end device is a power supply (e.g., a load distribution);
if the current node is a non-key element, judging the current node to be a key element, not carrying out node combination operation, moving the node to the previous node, and judging whether the current node is a non-key element again.
If the terminal equipment is not powered on, judging whether a previous node of the terminal equipment is a non-key element or not, if the previous node is a key element, not performing node combination operation, and restarting to judge whether a current node is a non-key element or not by a next node of the key element; and if the previous node of the end equipment is a non-critical element, carrying out node combination operation, and combining the information of the node where the end equipment is located and the previous node of the end equipment into the previous node of the end equipment. And recognizing the nodes after the node merging operation as the refined nodes and recognizing the refined nodes as non-key elements.
And S44, carrying out node merging operation on the latest refined node to the previous node, and selecting a proper traversal method according to the port property of the previous node to determine a traversal route.
And S45, traversing all nodes of the analysis area, and ensuring that two connected non-key element nodes do not exist after traversing is completed, namely finishing the topology network refinement of the analysis area.
S5, based on the elastic power distribution network structure, carrying out power distribution network load flow calculation by adopting a PQ decomposition method to obtain node voltage and load flow distribution conditions; and analyzing the node voltage and the power flow distribution condition after the new load is accessed according to the node voltage and the power flow distribution condition to obtain a reliability result of the power distribution network accessed by the new load.
The other technical scheme provided by the invention is as follows:
a system for a new load access reliability analysis method, comprising:
the system comprises a first module, a second module and a third module, wherein the first module is used for calling a power distribution network frame model of an area to be analyzed from a power information system to obtain a power distribution network topological structure;
the second module is used for extracting all element equipment information in the distribution network of the area to be analyzed from the topological structure of the distribution network;
the third module is used for traversing all element equipment information in the area to be analyzed and determining a key element and a non-key element;
the fourth module is used for combining non-key elements of the power distribution network by taking the key elements as the center to form an elastic power distribution network structure;
and the fifth module is used for analyzing the node voltage and the tide distribution condition after the new load is accessed based on the elastic power distribution network structure to obtain the reliability result of the power distribution network accessed by the new load.
The invention provides another technical scheme that:
an apparatus for a new load access reliability analysis method includes a memory and a processor;
a memory for storing a computer program; a processor for implementing a new load access reliability analysis method when executing a computer program.
The invention provides another technical scheme that:
a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements a new load access reliability analysis method.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (8)
1. The new load access reliability analysis method is characterized by comprising the following steps:
calling a power distribution network frame model of an area to be analyzed from a power information system to obtain a power distribution network topological structure;
extracting all element equipment information in a distribution network in an area to be analyzed from a distribution network topological structure;
traversing all element equipment information in the area to be analyzed, and determining a key element and a non-key element;
taking the key elements as the center, combining the non-key elements of the power distribution network to form an elastic power distribution network structure;
and analyzing the node voltage and the tide distribution condition after the new load is accessed based on the elastic power distribution network structure to obtain the reliability result of the power distribution network accessed by the new load.
2. The new load access reliability analysis method according to claim 1, wherein the key elements are: the method comprises the following steps that an outlet circuit breaker, a load distribution transformer and a new load access point node for measuring collection quantity in the power distribution network are used;
component devices other than critical components are considered non-critical components.
3. The new load access reliability analysis method according to claim 1, wherein non-critical elements of the distribution network are merged with a critical element as a center to form an elastic distribution network structure, and the specific manner is as follows:
classifying the element equipment according to the topological structure of the power distribution network and the port properties of the element equipment, and determining terminal equipment;
traversing all terminal equipment in a power distribution network topological structure, and judging whether the terminal equipment is a non-key element;
if the terminal equipment is a non-key element, judging whether a previous node of the terminal equipment is the non-key element, if the previous node is the key element, not performing node combination operation, and restarting to judge whether a current node is the non-key element by a next node of the key element; if the previous node of the terminal equipment is a non-key element, merging the information of the node where the terminal equipment is located and the previous node of the terminal equipment into the previous node of the terminal equipment to form a refined node, regarding the refined node as a non-key element, and continuing node merging operation on the latest refined node until two connected non-key element nodes do not exist to form an elastic power distribution network structure;
and if the terminal equipment is a key element, not performing node combination operation, and judging whether the terminal equipment is a non-key element again by the next node of the terminal equipment.
4. The new load access reliability analysis method of claim 3, wherein the method of determining the end device is: the element equipment is positioned at the tail end of the topological structure of the power distribution network, and the equipment is judged to be the tail end equipment when only one port exists.
5. The method for analyzing the reliability of the new load access according to claim 1, wherein the distribution of the node voltage and the power flow after the new load access is analyzed based on the elastic power distribution network structure, and the method specifically comprises the following steps:
based on the elastic power distribution network structure, carrying out power distribution network load flow calculation by adopting a PQ decomposition method to obtain node voltage and load flow distribution conditions;
and analyzing the voltage and load conditions of the power distribution network node after the new load is accessed according to the node voltage and load distribution conditions, thereby mastering the reliability condition of the power distribution network after the new load is accessed.
6. A system for analyzing reliability of new load access is characterized by comprising the following steps:
the system comprises a first module, a second module and a third module, wherein the first module is used for calling a power distribution network frame model of an area to be analyzed from a power information system to obtain a power distribution network topological structure;
the second module is used for extracting all element equipment information in the distribution network of the area to be analyzed from the topological structure of the distribution network;
the third module is used for traversing all element equipment information in the area to be analyzed and determining a key element and a non-key element;
the fourth module is used for combining non-key elements of the power distribution network by taking the key elements as the center to form an elastic power distribution network structure;
and the fifth module is used for analyzing the node voltage and the load flow distribution condition after the new load is accessed based on the elastic power distribution network structure to obtain the reliability result of the power distribution network accessed by the new load.
7. An apparatus for a new load access reliability analysis method, comprising a memory and a processor;
the memory for storing a computer program; the processor, configured to, when executing the computer program, implement the new load access reliability analysis method according to any of claims 1 to 5.
8. A computer-readable storage medium, characterized in that the storage medium has stored thereon a computer program which, when being executed by a processor, carries out a new load access reliability analysis method according to any one of claims 1 to 5.
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| CN112952821A (en) * | 2021-03-24 | 2021-06-11 | 国网北京市电力公司 | Power distribution network stability evaluation system and method, terminal device and readable storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018082364A1 (en) * | 2016-11-02 | 2018-05-11 | 全球能源互联网研究院有限公司 | Method and device for analyzing power-off range of power distribution network, and computer storage medium |
| CN112952821A (en) * | 2021-03-24 | 2021-06-11 | 国网北京市电力公司 | Power distribution network stability evaluation system and method, terminal device and readable storage medium |
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