CN116739348A - Risk assessment method and system for safety state of power grid equipment - Google Patents
Risk assessment method and system for safety state of power grid equipment Download PDFInfo
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- G—PHYSICS
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- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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- G06Q10/063—Operations research, analysis or management
- G06Q10/0635—Risk analysis of enterprise or organisation activities
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Abstract
The invention relates to the technical field of power grid risk assessment, and discloses a risk assessment method and a system for a power grid equipment safety state.
Description
Technical Field
The invention relates to the technical field of power grid risk assessment, in particular to a risk assessment method and system for a safety state of power grid equipment.
Background
To achieve intrinsic safety of equipment in an electric power enterprise, firstly, the equipment should have high reliability, good safety characteristics, perfect safety protection system and safety protection system, and even if human misoperation or equipment accident occurs, personal safety and equipment safety can be ensured.
Because the electric power environment is complicated, the degree of mechanization is low, the labor intensity of workers is high, the forward movement of a safety risk management and control gateway and the source prevention and control are realized through planning and building an intrinsic safety power grid, the network access quality and the health level of equipment facilities are improved, and the intrinsic safety of objects is realized.
Meanwhile, among important users in the power grid, the corresponding power grid equipment safety state is particularly important, and currently, risk assessment of the power grid equipment safety state of the important users is inaccurate and poor in reliability, so that the power supply capacity of the important users is insufficient.
Disclosure of Invention
The invention provides a risk assessment method and a risk assessment system for a safety state of power grid equipment, and solves the technical problems that risk assessment for the safety state of the power grid equipment of an important user is inaccurate and poor in reliability.
In view of this, the first aspect of the present invention provides a risk assessment method for a safety state of power grid equipment, including the following steps:
acquiring attribute information and operation information of all user sides in a power distribution network, wherein the attribute information comprises importance levels and user ammeter addresses, and the operation information comprises voltage data and power failure time;
constructing a right undirected graph according to the topological connection structure between all equipment nodes and a user side in the power distribution network;
matching the user ammeter address to a corresponding power supply in a preset ammeter database according to the user ammeter address;
based on a breadth-first search algorithm, carrying out topology analysis on the user side with the highest importance level in the ownership undirected graph until the user side is correspondingly matched with the power supply, and obtaining a corresponding power supply path, wherein the power supply path comprises the power supply, a circuit, a sectionalizing switch and relay protection equipment;
calculating the power ratio between the output power of the power supply and the rated power of the power supply, judging whether the power ratio is larger than the load factor threshold of the power supply path, if so, judging that the power ratio is larger than the load factor threshold of the power supply path, and if so, judging that the power supply configuration of the user side with the highest corresponding importance level is unqualified, thereby determining the power supply configuration qualification rate of all the user sides with the highest importance level;
acquiring FTU parameters of relay protection equipment, and calculating relay protection correct action rates according to the FTU parameters of the relay protection equipment, so as to determine relay protection correct action rates of all user sides with highest importance levels;
determining the annual average power failure time and the annual average voltage qualification rate of all the user sides with the highest importance levels according to the operation information of the user sides with the highest importance levels;
carrying out standardized processing on the power supply configuration qualification rate, the relay protection correct action rate, the average power failure time in the year and the voltage qualification rate of the user side with the highest importance level, and carrying out weighted calculation to obtain the equipment running state safety value of the user side with the highest importance level;
and comparing the equipment operation state safety value with a preset state safety threshold, if the equipment operation state safety value is larger than the preset state safety threshold, judging that the equipment safety state of the user side with the highest importance level is a reliable state, and if the equipment operation state safety value is not larger than the preset state safety threshold, judging that the equipment safety state of the user side with the highest importance level is at risk.
Preferably, the step of constructing the digraph with right and no direction according to the topological connection structure between all the equipment nodes and the user side in the power distribution network specifically includes:
constructing an undirected graph according to topological connection structures between all equipment nodes and a user side in the power distribution network;
and taking the electrical distances among all the equipment nodes as the weight values of the edges of the undirected graph, and constructing the authorized undirected graph.
Preferably, the method further comprises:
dividing the power supply path into a plurality of sections according to a sectionalizing switch, and acquiring a maximum current value and a rated current value corresponding to each section respectively;
and calculating the current ratio between the maximum current value and the rated current value of each section as the load ratio of the corresponding section, and screening out the minimum load ratio of all sections as the load ratio threshold of the power supply path.
Preferably, based on a breadth-first search algorithm, performing topology analysis on the user side with the highest importance level in the ownership undirected graph until the user side is correspondingly matched with the power supply to obtain a corresponding power supply path, wherein the power supply path comprises a power supply, a line, a sectionalizing switch and relay protection equipment, and the method specifically comprises the following steps:
and taking the user side with the highest importance level as a topology starting point, taking the power supply corresponding to the matched power supply of the user side with the highest importance level as a topology ending point, performing topology analysis upwards from the topology starting point in the authorized undirected graph based on a breadth-first search algorithm, and determining a node associated with power supply of the topology starting point until the topology ending point to obtain a power supply path, wherein the power supply path comprises the power supply, a line, a sectioning switch and relay protection equipment.
Preferably, the step of determining the annual average outage time and the annual average outage rate of all the user sides with the highest importance level according to the operation information of the user side with the highest importance level specifically includes:
calculating average power failure time in the year according to the ratio of the power failure time of the user with the highest importance level to the total running time in the year;
collecting voltage data of a user side with the highest importance level according to a preset frequency;
performing fast Fourier transform on the voltage data to obtain frequency domain voltage information;
determining the number of voltage loss times, the number of overvoltage times and the number of voltage unbalance times in a preset period according to the frequency domain voltage information;
counting the number of voltage loss, the number of overvoltage and the number of voltage unbalance to obtain the total number of unqualified voltage, and calculating the duty ratio of the total number of unqualified voltage in all sample points in the frequency domain voltage information;
and (3) carrying out average calculation on the duty ratio of the total times of unqualified voltage of all the user sides with the highest importance level, and obtaining the voltage qualification rate.
In a second aspect, the present invention further provides a risk assessment system for a safety state of power grid equipment, including:
the information acquisition module is used for acquiring attribute information and operation information of all user sides in the power distribution network, wherein the attribute information comprises an importance level and a user ammeter address, and the operation information comprises voltage data and power failure time;
the system comprises a weighted undirected graph construction module, a weighted undirected graph construction module and a weighted undirected graph construction module, wherein the weighted undirected graph construction module is used for constructing the weighted undirected graph according to the topological connection structure between all equipment nodes and a user side in the power distribution network;
the power supply matching module is used for matching corresponding power supply power supplies in a preset ammeter database according to the user ammeter address;
the topology analysis module is used for carrying out topology analysis on the user side with the highest importance level in the ownership undirected graph based on the breadth-first search algorithm until the corresponding matched power supply source is obtained, and the power supply path comprises the power supply source, a line, a sectionalizing switch and relay protection equipment;
the power supply configuration evaluation module is used for calculating the power ratio between the output power of the power supply and the rated power of the power supply, judging whether the power ratio is larger than the load ratio threshold of the power supply path, and if so, judging that the power ratio is larger than the load ratio threshold of the power supply path, judging that the power supply configuration of the corresponding user side with the highest importance level is unqualified, thereby determining the power supply configuration qualification rate of all the user sides with the highest importance level;
the relay protection evaluation module is used for acquiring the FTU parameters of the relay protection equipment, and calculating the relay protection correct action rate according to the FTU parameters of the relay protection equipment so as to determine the relay protection correct action rates of all user sides with the highest importance level;
the voltage evaluation module is used for determining the annual average power failure time and the voltage qualification rate of all the user sides with the highest importance level according to the operation information of the user side with the highest importance level;
the running state calculation module is used for carrying out standardized processing on the power supply configuration qualification rate, the relay protection correct action rate, the average power failure time in the year and the voltage qualification rate of the user side with the highest importance level, and carrying out weighted calculation to obtain the equipment running state safety value of the user side with the highest importance level;
and the running state evaluation module is used for comparing the running state safety value of the equipment with a preset state safety threshold, judging that the equipment safety state of the user side with the highest importance level is a reliable state if the running state safety value of the equipment is larger than the preset state safety threshold, and judging that the equipment safety state of the user side with the highest importance level is at risk if the running state safety value of the equipment is not larger than the preset state safety threshold.
Preferably, the weighted undirected graph construction module specifically includes:
the undirected graph construction module is used for constructing undirected graphs according to topological connection structures between all equipment nodes and user sides in the power distribution network;
and the weight module is used for constructing a weighted undirected graph by taking the electrical distances among all the equipment nodes as the weight of the edges of the undirected graph.
Preferably, the system further comprises:
the section dividing module is used for dividing the power supply path into a plurality of sections according to the sectionalizing switch, and obtaining a maximum current value and a rated current value corresponding to each section respectively;
and the load factor screening module is used for calculating the current ratio between the maximum current value and the rated current value of each section as the load factor of the corresponding section, and screening out the minimum load factor in all sections as the load factor threshold of the power supply path.
Preferably, the topology analysis module is specifically configured to take a user side with a highest importance level as a topology starting point, and a power supply source corresponding to the user side with the highest importance level as a topology ending point, perform topology analysis from the topology starting point upwards in the ownership undirected graph based on a breadth-first search algorithm, determine a node associated with power supply from the topology starting point until the topology ending point, and obtain a power supply path, where the power supply path includes the power supply source, a line, a sectionalizing switch and relay protection equipment.
Preferably, the voltage evaluation module specifically includes:
the power failure time calculation module is used for calculating the average power failure time in the year according to the ratio of the power failure time of the user side with the highest importance level to the total operation time in the year;
the voltage acquisition module is used for acquiring voltage data of the user side with the highest importance level according to the preset frequency;
the conversion module is used for performing fast Fourier transform on the voltage data to obtain frequency domain voltage information;
the voltage disqualification determining module is used for determining the number of voltage losing times, the number of overvoltage times and the number of voltage unbalance times in a preset period according to the frequency domain voltage information;
the voltage failure calculation module is used for obtaining total voltage failure times by counting the voltage losing times, the overvoltage times and the voltage unbalance times, and calculating the duty ratio of the total voltage failure times in all sample points in the frequency domain voltage information;
and the voltage qualification rate calculation module is used for carrying out average calculation on the duty ratio of the total times of unqualified voltage of all the user sides with the highest importance level to obtain the voltage qualification rate.
From the above technical scheme, the invention has the following advantages:
according to the method, the device and the system, attribute information and operation information of all user sides in the power distribution network are obtained, an authorized undirected graph is constructed according to topological connection structures between all device nodes and the user sides in the power distribution network, topology analysis is carried out on the user side with the highest importance level in the authorized undirected graph based on a breadth-first search algorithm, a corresponding power supply path is obtained, the power supply configuration qualification rate, relay protection correct action rate, annual average power failure time and voltage qualification rate of all the user sides with the highest importance level are determined, weighting calculation is carried out, a device operation state safety value is obtained, and according to a comparison result of the device operation state safety value and a preset state safety threshold, the risk condition of the device safety state of the user side with the highest importance level is determined, so that the accuracy and the reliability of risk assessment of the power device safety state of important users are improved.
Drawings
Fig. 1 is a flowchart of a risk assessment method for a security state of a power grid device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a risk assessment system for a safety state of power grid equipment according to an embodiment of the present invention.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, 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.
For easy understanding, please refer to fig. 1, the risk assessment method for the safety state of the power grid equipment provided by the invention includes the following steps:
101. and acquiring attribute information and operation information of all user sides in the power distribution network, wherein the attribute information comprises importance levels and user ammeter addresses, and the operation information comprises voltage data and power failure time.
The importance level is an importance level set in advance for the user side, and is used for evaluating the importance of the user side, and can be classified into high, medium and low.
102. And constructing a right-of-no-direction graph according to the topological connection structure between all equipment nodes and the user side in the power distribution network.
The topological connection structure between all the equipment nodes and the user side in the power distribution network can be obtained based on a power grid GIS system, and the topological connection structure comprises a topological connection structure between all the equipment nodes and a topological connection structure between the equipment nodes and the user side.
103. And matching the user ammeter address to a corresponding power supply in a preset ammeter database. The preset ammeter database comprises a mapping relation between a user ammeter address and a power supply, and the power supply can be a transformer station or a transformer.
104. Based on breadth-first search algorithm, carrying out topology analysis on the user side with the highest importance level in the authorized undirected graph until the user side is correspondingly matched with the power supply, and obtaining a corresponding power supply path, wherein the power supply path comprises the power supply, a line, a sectionalizing switch and relay protection equipment.
Wherein the breadth-first search algorithm systematically expands and examines all nodes in the weighted undirected graph for results. The breadth-first search algorithm is as follows: before the search starts, all nodes in the weighted undirected graph are white, and as the search proceeds, each node gradually turns gray and then black. When a node is first encountered in a search, we say that the node is found, at which point the node becomes a non-white node. Thus, both gray and black nodes have been found, but breadth-first search algorithms distinguish them to ensure that searches are performed in breadth-first fashion.
And meanwhile, carrying out topology analysis on the user side with the highest importance level in the authorized undirected graph through a breadth-first search algorithm until the user side is correspondingly matched with the power supply, wherein the obtained corresponding power supply path is a power supply path from the power supply to the corresponding user side.
105. And calculating the power ratio between the output power of the power supply and the rated power of the power supply, judging whether the power ratio is larger than the load factor threshold of the power supply path, and if so, judging that the power supply configuration of the user side with the highest corresponding importance level is unqualified, thereby determining the power supply configuration qualification rate of all the user sides with the highest importance level.
And if the power ratio is judged to be not more than the load factor threshold of the power supply path, the power supply configuration is judged to be qualified.
106. And acquiring the FTU parameters of the relay protection equipment, and calculating the relay protection correct action rate according to the FTU parameters of the relay protection equipment, so as to determine the relay protection correct action rate of all the user sides with the highest importance level.
The FTU parameters comprise relay protection action conditions and relay protection correct action rates, and the relay protection correct action rates of the relay protection equipment of the user side with the highest importance level are counted, so that the relay protection correct action rates of all the user sides with the highest importance level are determined.
107. And determining the annual average power failure time and the annual average voltage qualification rate of all the user sides with the highest importance levels according to the operation information of the user sides with the highest importance levels.
The average power failure time in the year can be counted for the average power failure time of low-voltage and medium-voltage users, and the voltage qualification rate can be the full-caliber voltage qualification rate.
108. And carrying out standardized processing on the power supply configuration qualification rate, the relay protection correct action rate, the annual average power failure time and the voltage qualification rate of the user side with the highest importance level, and carrying out weighted calculation to obtain the equipment running state safety value of the user side with the highest importance level.
The weight values corresponding to the power supply configuration qualification rate, the relay protection correct action rate, the average power failure time in the year and the voltage qualification rate at the user side can be set through experience values or determined through a hierarchical analysis method.
109. And comparing the equipment running state safety value with a preset state safety threshold, if the equipment running state safety value is larger than the preset state safety threshold, judging that the equipment safety state of the user side with the highest importance level is a reliable state, and if the equipment running state safety value is not larger than the preset state safety threshold, judging that the equipment safety state of the user side with the highest importance level is at risk.
The risk level can be set to be low, medium or high, corresponding risk level thresholds are set for a plurality of risk levels, and the risk levels of the equipment safety state of the user side are determined by comparing the risk level thresholds with the equipment operation state safety value.
It should be noted that the invention provides a risk assessment method for the safety state of power grid equipment, which is characterized in that attribute information and operation information of all user sides in a power distribution network are obtained, a weighted undirected graph is constructed according to a topological connection structure between all equipment nodes and the user sides in the power distribution network, topology analysis is carried out on the user side with the highest importance level in the weighted undirected graph based on a breadth-first search algorithm to obtain a corresponding power supply path, the safety value of the equipment operation state is obtained by determining the power supply configuration qualification rate, the relay protection correct action rate, the average power failure time in the year and the voltage qualification rate of all the user sides with the highest importance level, and the risk condition of the safety state of the equipment at the user side with the highest importance level is determined according to the comparison result of the safety value of the equipment operation state and a preset state safety threshold value, so that the accuracy and the reliability of the risk assessment of the safety state of the power equipment of important users are improved.
In one embodiment, step 102 specifically includes:
1021. and constructing an undirected graph according to the topological connection structure between all the equipment nodes and the user side in the power distribution network.
1022. And taking the electrical distances among all the equipment nodes as the weight values of the edges of the undirected graph, and constructing the undirected graph with the right.
Wherein the electrical distances between the device nodes should be different device nodes.
In a specific embodiment, the method further comprises:
111. the power supply path is divided into a plurality of sections according to the sectionalizing switch, and the maximum current value and the rated current value corresponding to each section are obtained.
The maximum current value of the section can be determined through the historical maximum current value, and the rated current value is the overcurrent protection current of relay protection equipment in the section.
112. And calculating the current ratio between the maximum current value and the rated current value of each section as the load ratio of the corresponding section, and screening out the minimum load ratio of all sections as the load ratio threshold of the power supply path.
It is understood that the minimum load rate in all the sections is taken as the load rate threshold value of the power supply path, and if the power supply exceeds the load rate threshold value, the existence of heavy load is judged, so that the sensitivity is improved.
In one embodiment, step 104 specifically includes:
and taking the user side with the highest importance level as a topology starting point, taking the power supply corresponding to the matched power supply of the user side with the highest importance level as a topology ending point, performing topology analysis upwards from the topology starting point in the authorized undirected graph based on a breadth-first search algorithm, and determining nodes related to power supply of the topology starting point until the topology ending point to obtain a power supply path, wherein the power supply path comprises the power supply, a line, a sectionalizing switch and relay protection equipment.
In one embodiment, step 107 specifically includes:
1071. and calculating the average power failure time in the year according to the ratio of the power failure time of the user with the highest importance level to the total operation time in the year.
1072. And acquiring voltage data of the user side with the highest importance level according to the preset frequency.
1073. And performing fast Fourier transform on the voltage data to obtain frequency domain voltage information.
The frequency domain voltage information can be characterized as a change relation between a voltage value and frequency, and each frequency point is a corresponding sampling point.
1074. And determining the number of voltage loss, the number of overvoltage and the number of voltage unbalance in a preset period according to the frequency domain voltage information.
Wherein, the three conditions of voltage loss, overvoltage and voltage unbalance are easily determined by the change condition of the voltage value.
1075. And counting the number of voltage losing, the number of overvoltage and the number of voltage unbalance to obtain the total number of unqualified voltage, and calculating the duty ratio of the total number of unqualified voltage in all sample points in the frequency domain voltage information.
1076. And (3) carrying out average calculation on the duty ratio of the total times of unqualified voltage of all the user sides with the highest importance level, and obtaining the voltage qualification rate.
The above is a detailed description of an embodiment of a risk assessment method for a security state of power grid equipment provided by the present invention, and the following is a detailed description of an embodiment of a risk assessment system for a security state of power grid equipment provided by the present invention.
For easy understanding, referring to fig. 2, the present invention further provides a risk assessment system for a safety state of a power grid device, including:
the information acquisition module 100 is configured to acquire attribute information and operation information of all user sides in the power distribution network, where the attribute information includes an importance level and a user electricity meter address, and the operation information includes voltage data and power failure time;
the weighted undirected graph construction module 200 is configured to construct a weighted undirected graph according to a topological connection structure between all equipment nodes and a user side in the power distribution network;
the power matching module 300 is configured to match a corresponding power supply in a preset ammeter database according to a user ammeter address;
the topology analysis module 400 is configured to perform topology analysis on the user side with the highest importance level in the weighted undirected graph based on the breadth-first search algorithm until the user side is correspondingly matched with the power supply, so as to obtain a corresponding power supply path, where the power supply path includes the power supply, a line, a sectionalizing switch and relay protection equipment;
the power supply configuration evaluation module 500 is configured to calculate a power ratio between an output power of a power supply and a rated power thereof, determine whether the power ratio is greater than a load factor threshold of a power supply path, and if the power ratio is greater than the load factor threshold of the power supply path, determine that the power supply configuration of the user side with the highest corresponding importance level is not qualified, thereby determining the power supply configuration qualification rate of all the user sides with the highest importance level;
the relay protection evaluation module 600 is configured to obtain FTU parameters of the relay protection device, calculate relay protection correct action rates according to the FTU parameters of the relay protection device, and thereby determine relay protection correct action rates of all user sides with highest importance levels;
the voltage evaluation module 700 is configured to determine an average annual power failure time and a voltage qualification rate of all the user sides with the highest importance levels according to the operation information of the user side with the highest importance level;
the running state calculation module 800 is configured to perform standardized processing on the power supply configuration qualification rate, the relay protection correct action rate, the average power failure time in the year and the voltage qualification rate of the user side with the highest importance level, and perform weighted calculation to obtain the running state safety values of the equipment of the user side with the highest importance level;
the operation state evaluation module 900 is configured to compare the device operation state security value with a preset state security threshold, determine that the device security state of the user side with the highest importance level is a reliable state if the device operation state security value is greater than the preset state security threshold, and determine that the device security state of the user side with the highest importance level is at risk if the device operation state security value is not greater than the preset state security threshold.
In a specific embodiment, the authorized undirected graph construction module specifically includes:
the undirected graph construction module is used for constructing undirected graphs according to topological connection structures between all equipment nodes and user sides in the power distribution network;
and the weight module is used for constructing a weighted undirected graph by taking the electrical distances among all the equipment nodes as the weight of the edges of the undirected graph.
In a specific embodiment, the system further comprises:
the section dividing module is used for dividing the power supply path into a plurality of sections according to the sectionalizing switch, and obtaining a maximum current value and a rated current value corresponding to each section respectively;
and the load factor screening module is used for calculating the current ratio between the maximum current value and the rated current value of each section as the load factor of the corresponding section, and screening out the minimum load factor in all sections as the load factor threshold of the power supply path.
In a specific embodiment, the topology analysis module is specifically configured to take a user side with a highest importance level as a topology starting point, and a power supply source corresponding to the user side with the highest importance level as a topology ending point, perform topology analysis from the topology starting point upwards in the weighted undirected graph based on a breadth-first search algorithm, determine a node associated with power supply from the topology starting point until the topology ending point, and obtain a power supply path, where the power supply path includes the power supply source, a line, a sectioning switch and a relay protection device.
In one embodiment, the voltage evaluation module specifically includes:
the power failure time calculation module is used for calculating the average power failure time in the year according to the ratio of the power failure time of the user side with the highest importance level to the total operation time in the year;
the voltage acquisition module is used for acquiring voltage data of the user side with the highest importance level according to the preset frequency;
the conversion module is used for performing fast Fourier transform on the voltage data to obtain frequency domain voltage information;
the voltage disqualification determining module is used for determining the number of voltage losing times, the number of overvoltage times and the number of voltage unbalance times in a preset period according to the frequency domain voltage information;
the voltage failure calculation module is used for counting the voltage losing times, the overvoltage times and the voltage unbalance times to obtain the total number of voltage failure times, and calculating the duty ratio of the total number of voltage failure times in all sample points in the frequency domain voltage information;
and the voltage qualification rate calculation module is used for carrying out average calculation on the duty ratio of the total times of unqualified voltage of all the user sides with the highest importance level to obtain the voltage qualification rate.
It will be clear to those skilled in the art that, for convenience and brevity of description, reference may be made to the corresponding process in the foregoing method embodiment for the specific working process of the above-described system, which is not described herein again.
In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The risk assessment method for the safety state of the power grid equipment is characterized by comprising the following steps of:
acquiring attribute information and operation information of all user sides in a power distribution network, wherein the attribute information comprises importance levels and user ammeter addresses, and the operation information comprises voltage data and power failure time;
constructing a right undirected graph according to the topological connection structure between all equipment nodes and a user side in the power distribution network;
matching the user ammeter address to a corresponding power supply in a preset ammeter database according to the user ammeter address;
based on a breadth-first search algorithm, carrying out topology analysis on the user side with the highest importance level in the ownership undirected graph until the user side is correspondingly matched with the power supply, and obtaining a corresponding power supply path, wherein the power supply path comprises the power supply, a circuit, a sectionalizing switch and relay protection equipment;
calculating the power ratio between the output power of the power supply and the rated power of the power supply, judging whether the power ratio is larger than the load factor threshold of the power supply path, if so, judging that the power ratio is larger than the load factor threshold of the power supply path, and if so, judging that the power supply configuration of the user side with the highest corresponding importance level is unqualified, thereby determining the power supply configuration qualification rate of all the user sides with the highest importance level;
acquiring FTU parameters of relay protection equipment, and calculating relay protection correct action rates according to the FTU parameters of the relay protection equipment, so as to determine relay protection correct action rates of all user sides with highest importance levels;
determining the annual average power failure time and the annual average voltage qualification rate of all the user sides with the highest importance levels according to the operation information of the user sides with the highest importance levels;
carrying out standardized processing on the power supply configuration qualification rate, the relay protection correct action rate, the average power failure time in the year and the voltage qualification rate of the user side with the highest importance level, and carrying out weighted calculation to obtain the equipment running state safety value of the user side with the highest importance level;
and comparing the equipment operation state safety value with a preset state safety threshold, if the equipment operation state safety value is larger than the preset state safety threshold, judging that the equipment safety state of the user side with the highest importance level is a reliable state, and if the equipment operation state safety value is not larger than the preset state safety threshold, judging that the equipment safety state of the user side with the highest importance level is at risk.
2. The risk assessment method for a safety state of power grid equipment according to claim 1, wherein the step of constructing a weighted undirected graph according to a topological connection structure between all equipment nodes and a user side in the power distribution network specifically comprises:
constructing an undirected graph according to topological connection structures between all equipment nodes and a user side in the power distribution network;
and taking the electrical distances among all the equipment nodes as the weight values of the edges of the undirected graph, and constructing the authorized undirected graph.
3. The risk assessment method for a safety state of a power grid device according to claim 1, further comprising:
dividing the power supply path into a plurality of sections according to a sectionalizing switch, and acquiring a maximum current value and a rated current value corresponding to each section respectively;
and calculating the current ratio between the maximum current value and the rated current value of each section as the load ratio of the corresponding section, and screening out the minimum load ratio of all sections as the load ratio threshold of the power supply path.
4. The risk assessment method for the safety state of the power grid equipment according to claim 1, wherein based on a breadth-first search algorithm, topology analysis is performed on a user side with the highest importance level in the ownership undirected graph to a corresponding matched power supply to obtain a corresponding power supply path, and the steps of the power supply path including the power supply, the line, the sectionalizing switch and the relay protection equipment specifically include:
and taking the user side with the highest importance level as a topology starting point, taking the power supply corresponding to the matched power supply of the user side with the highest importance level as a topology ending point, performing topology analysis upwards from the topology starting point in the authorized undirected graph based on a breadth-first search algorithm, and determining a node associated with power supply of the topology starting point until the topology ending point to obtain a power supply path, wherein the power supply path comprises the power supply, a line, a sectioning switch and relay protection equipment.
5. The risk assessment method for the safety state of power grid equipment according to claim 1, wherein the step of determining the annual average outage time and the annual average outage rate of all the user sides with the highest importance levels according to the operation information of the user sides with the highest importance levels specifically comprises:
calculating average power failure time in the year according to the ratio of the power failure time of the user with the highest importance level to the total running time in the year;
collecting voltage data of a user side with the highest importance level according to a preset frequency;
performing fast Fourier transform on the voltage data to obtain frequency domain voltage information;
determining the number of voltage loss times, the number of overvoltage times and the number of voltage unbalance times in a preset period according to the frequency domain voltage information;
counting the number of voltage loss, the number of overvoltage and the number of voltage unbalance to obtain the total number of unqualified voltage, and calculating the duty ratio of the total number of unqualified voltage in all sample points in the frequency domain voltage information;
and (3) carrying out average calculation on the duty ratio of the total times of unqualified voltage of all the user sides with the highest importance level, and obtaining the voltage qualification rate.
6. A risk assessment system for a safety state of a power grid device, comprising:
the information acquisition module is used for acquiring attribute information and operation information of all user sides in the power distribution network, wherein the attribute information comprises an importance level and a user ammeter address, and the operation information comprises voltage data and power failure time;
the system comprises a weighted undirected graph construction module, a weighted undirected graph construction module and a weighted undirected graph construction module, wherein the weighted undirected graph construction module is used for constructing the weighted undirected graph according to the topological connection structure between all equipment nodes and a user side in the power distribution network;
the power supply matching module is used for matching corresponding power supply power supplies in a preset ammeter database according to the user ammeter address;
the topology analysis module is used for carrying out topology analysis on the user side with the highest importance level in the ownership undirected graph based on the breadth-first search algorithm until the corresponding matched power supply source is obtained, and the power supply path comprises the power supply source, a line, a sectionalizing switch and relay protection equipment;
the power supply configuration evaluation module is used for calculating the power ratio between the output power of the power supply and the rated power of the power supply, judging whether the power ratio is larger than the load ratio threshold of the power supply path, and if so, judging that the power ratio is larger than the load ratio threshold of the power supply path, judging that the power supply configuration of the corresponding user side with the highest importance level is unqualified, thereby determining the power supply configuration qualification rate of all the user sides with the highest importance level;
the relay protection evaluation module is used for acquiring the FTU parameters of the relay protection equipment, and calculating the relay protection correct action rate according to the FTU parameters of the relay protection equipment so as to determine the relay protection correct action rates of all user sides with the highest importance level;
the voltage evaluation module is used for determining the annual average power failure time and the voltage qualification rate of all the user sides with the highest importance level according to the operation information of the user side with the highest importance level;
the running state calculation module is used for carrying out standardized processing on the power supply configuration qualification rate, the relay protection correct action rate, the average power failure time in the year and the voltage qualification rate of the user side with the highest importance level, and carrying out weighted calculation to obtain the equipment running state safety value of the user side with the highest importance level;
and the running state evaluation module is used for comparing the running state safety value of the equipment with a preset state safety threshold, judging that the equipment safety state of the user side with the highest importance level is a reliable state if the running state safety value of the equipment is larger than the preset state safety threshold, and judging that the equipment safety state of the user side with the highest importance level is at risk if the running state safety value of the equipment is not larger than the preset state safety threshold.
7. The risk assessment system for a safety state of a power grid device according to claim 6, wherein the weighted undirected graph construction module specifically comprises:
the undirected graph construction module is used for constructing undirected graphs according to topological connection structures between all equipment nodes and user sides in the power distribution network;
and the weight module is used for constructing a weighted undirected graph by taking the electrical distances among all the equipment nodes as the weight of the edges of the undirected graph.
8. The risk assessment system for a power grid plant safety status of claim 6, further comprising:
the section dividing module is used for dividing the power supply path into a plurality of sections according to the sectionalizing switch, and obtaining a maximum current value and a rated current value corresponding to each section respectively;
and the load factor screening module is used for calculating the current ratio between the maximum current value and the rated current value of each section as the load factor of the corresponding section, and screening out the minimum load factor in all sections as the load factor threshold of the power supply path.
9. The risk assessment system of the power grid equipment safety state according to claim 6, wherein the topology analysis module is specifically configured to take a user side with a highest importance level as a topology starting point, take a power supply source corresponding to the user side with the highest importance level as a topology end point, perform topology analysis upwards from the topology starting point in the authorized undirected graph based on a breadth-first search algorithm, determine a node associated with power supply from the topology starting point until the topology end point, and obtain a power supply path, where the power supply path includes a power supply source, a line, a sectionalizing switch and a relay protection device.
10. The risk assessment system for a safety state of a power grid device according to claim 6, wherein the voltage assessment module specifically comprises:
the power failure time calculation module is used for calculating the average power failure time in the year according to the ratio of the power failure time of the user side with the highest importance level to the total operation time in the year;
the voltage acquisition module is used for acquiring voltage data of the user side with the highest importance level according to the preset frequency;
the conversion module is used for performing fast Fourier transform on the voltage data to obtain frequency domain voltage information;
the voltage disqualification determining module is used for determining the number of voltage losing times, the number of overvoltage times and the number of voltage unbalance times in a preset period according to the frequency domain voltage information;
the voltage failure calculation module is used for obtaining total voltage failure times by counting the voltage losing times, the overvoltage times and the voltage unbalance times, and calculating the duty ratio of the total voltage failure times in all sample points in the frequency domain voltage information;
and the voltage qualification rate calculation module is used for carrying out average calculation on the duty ratio of the total times of unqualified voltage of all the user sides with the highest importance level to obtain the voltage qualification rate.
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