CN113922343A - Power distribution network protection fixed value setting method, terminal equipment and storage medium - Google Patents

Power distribution network protection fixed value setting method, terminal equipment and storage medium Download PDF

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CN113922343A
CN113922343A CN202111107788.2A CN202111107788A CN113922343A CN 113922343 A CN113922343 A CN 113922343A CN 202111107788 A CN202111107788 A CN 202111107788A CN 113922343 A CN113922343 A CN 113922343A
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fault
protection device
distribution network
line
power distribution
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CN113922343B (en
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严敬汝
王献志
李铁成
刘清泉
闫鹏
陈天英
李泽
周雪青
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
State Grid Hebei Energy Technology Service Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
State Grid Hebei Energy Technology Service Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • 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
    • G06F30/27—Design optimisation, verification or simulation using machine learning, e.g. artificial intelligence, neural networks, support vector machines [SVM] or training a model
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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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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    • G06F2113/00—Details relating to the application field
    • G06F2113/04—Power grid distribution networks
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • 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
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

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Abstract

The application is applicable to the technical field of power distribution networks, and provides a power distribution network protection setting value setting method, terminal equipment and a storage medium. The method comprises the following steps: acquiring first action time of a main protection device in a line when the line has a first fault and second action time of a backup protection device in the line when the line has the first fault; establishing a target function of a setting optimization model according to the first action time and the second action time; solving the determined optimization model through an ant colony algorithm, and determining a first setting value of the line when a first fault occurs; and acquiring wave recording data when the first fault occurs through wave recording equipment arranged on the feeder line, and determining the type of the first fault according to the wave recording data. The application can not influence the access of a large-capacity distributed power supply to the power distribution network, and effectively improves the action time and the protection range of the relay protection device of the power distribution network.

Description

Power distribution network protection fixed value setting method, terminal equipment and storage medium
Technical Field
The application relates to the technical field of power distribution networks, in particular to a power distribution network protection setting value setting method, terminal equipment and a storage medium.
Background
Compared with the traditional fossil energy, the distributed energy has the advantages of low cost, cleanness, environmental protection and the like, so that the distributed energy is connected to a power grid in a large quantity. Grid connection of a large number of distributed power supplies changes the grid structure and the operation mode of the power distribution network, and challenges are brought to the safety and the reliability of the power distribution network. The boost current of the distributed power supply grid connection to the feeder line fault point changes the single direction and the current magnitude of the feeder line tide, so that the setting difficulty of the fixed value of the power distribution network relay protection device is increased, the problems of power distribution network protection failure, misoperation, improper upper and lower stages of matching and the like can be caused, the safe and stable operation of the power distribution network is greatly influenced, and the action speed and the protection range of the power distribution network protection are greatly challenged.
The grid connection of the large-capacity distributed power supply enables a setting method and a matching mode of power distribution network protection to be more complex, and the traditional three-section type current protection is not applicable any more. Aiming at the challenge brought by the grid connection of a large-capacity distributed power supply, the conventional protection scheme is to cut off the access of most distributed power supplies in a power distribution network when a fault occurs, or to reduce the short-circuit current injected by the distributed power supplies to a feeder line fault point by using a current limiter so as to ensure the correct action of the original protection. The methods do not change the original protection greatly, have certain economical efficiency, but limit the access capacity of the distributed power supply greatly, influence the quick action, sensitivity and selectivity of the protection, and do not meet the long-term development target of the large-capacity grid connection of the distributed power supply.
Disclosure of Invention
In view of this, the embodiment of the application provides a method for setting a protection setting value of a power distribution network, a terminal device and a storage medium, which do not affect access of a large-capacity distributed power supply to the power distribution network.
In order to achieve the purpose, the technical scheme is as follows:
in a first aspect, an embodiment of the present application provides a power distribution network protection fixed value setting method, including:
acquiring first action time of a main protection device in a line when a first fault occurs in the line and second action time of a backup protection device in the line when the first fault occurs in the line, wherein the first fault is any fault which can occur in the line;
establishing an objective function of a setting optimization model according to the first action time and the second action time, wherein the constraint conditions of the setting optimization model comprise at least one of the following items: the overcurrent protection device comprises overcurrent protection action characteristic constraint conditions, overcurrent protection device standard constraint conditions and main protection device and backup protection device matching constraint conditions;
solving the setting optimization model through an ant colony algorithm, and determining a first setting value of the line when the first fault occurs; and acquiring wave recording data when the first fault occurs through wave recording equipment arranged on a feeder line, and determining the type of the first fault according to the wave recording data.
In the embodiment of the application, a target function of a setting optimization model is established according to a first action time of a main protection device when a first fault occurs on a line and a second action time of a backup protection device when the first fault occurs on the line, and at least one of an overcurrent protection action characteristic constraint condition, an overcurrent protection device standard constraint condition and a main protection device and backup protection device matching constraint condition is combined to serve as a constraint condition of the setting optimization model. And then, solving through an ant colony algorithm setting optimization model, and determining a first setting value of the line when the first fault occurs. And then, acquiring wave recording data when the first fault occurs through wave recording equipment arranged on the feeder line, and determining the type of the first fault according to the wave recording data. Therefore, compared with the traditional three-section type current protection, the power distribution network protection device has the advantages that false action or even refusal action can occur due to the fact that the power distribution network protection device does not have directivity, the power distribution network protection device can not affect the access of the high-capacity distributed power supply, the influence of the access of the high-capacity distributed power supply on the protection of the power distribution network can be solved, the action time and the protection range of the relay protection device of the power distribution network can be effectively prolonged, and power is provided for safe and reliable operation of the power distribution network including the high-capacity distributed power supply.
Based on the first aspect, in some embodiments, the objective function is:
Figure BDA0003272990480000021
wherein Z is the total number of the main protection devices, H is the total number of the backup protection devices, TiopFor the action time of the primary protection i in the first fault, TjopThe action time of backup protection j under the first failure.
Based on the first aspect, in some embodiments, the overcurrent protection action characteristic constraint condition is:
Figure BDA0003272990480000031
wherein the content of the first and second substances,Topfor the operating time of the overcurrent protection device, n1、n2Is a predetermined constant, IfaIs a fault current;
the standard constraint conditions of the overcurrent protection device are as follows:
TDSmin≤TDS≤TDSmax
Icdmin≤Icd≤Icdmax
wherein, TDSminUpper limit of time-setting coefficient, TDSmaxIs the lower limit of the time setting coefficient, IcdminTo lower limit of starting current, IcdmaxIs the upper limit of the starting current;
the main protection device and the backup protection device are matched with the constraint conditions that:
when a feeder line has a fault, if the main protection device fails to operate due to a fault, the backup protection device starts to operate, and the operating time of the main protection device and the operating time of the backup protection device meet Tjop＝Tiop+ Δ T, where TjopFor the actuation time of the backup protection device, TiopAnd delta T is the action time of the main protection device and is a preset time difference value.
Based on the first aspect, in some embodiments, the process of solving the tuning optimization model by the ant colony algorithm is as follows:
constructing a basic random path (i, j);
at the t-th moment, the probability that the ant k walks to the path (i, j) is PijkAnd then:
Figure BDA0003272990480000032
in the formula, Sij(t) is the pheromone on path (i, j) at time t; eij(t) is the expectation function of ants going from node i to node j, Eij(t)＝1/Lij，LijIs the distance between nodes i and j; a is a pheromone influence factor, b is an expected influence factor;
at the t thnAt each of the time points, the time point,pheromone Sij(tn) According to the formula:
Figure BDA0003272990480000041
update, in the formula: alpha is pheromone volatilization coefficient, delta Sij(t) pheromone increment left by the ant colony on path (i, j), K is the total number of ants in the ant colony;
Figure BDA0003272990480000042
the pheromone increment left by the kth ant when the kth ant passes through the path (i, j), and ST is the pheromone strength;
determining elite ants of a setting scheme for optimizing the objective function, increasing the intensity of pheromones left by the elite ants, and replacing paths taken by other ants with the current optimal paths, wherein the pheromone increment formula of the elite ants is as follows:
Figure BDA0003272990480000043
in the formula:
Figure BDA0003272990480000044
increase of pheromone of Elite ant, LbestThe optimal path length selected for elite ants, ST being the pheromone strength;
and repeating the steps until a global optimal solution is obtained.
Based on the first aspect, in some embodiments, for a main feeder line, at least three wave recording devices are installed between two section switches, where the three wave recording devices are located at three or more positions of the main feeder line, a first position is a head end switch position of the main feeder line, a second position is a tail end switch position of the main feeder line, and the rest positions are preset positions on the main feeder line between the head end switch and the tail end switch.
Based on the first aspect, in some embodiments, for the feeder branch, a wave recording device is installed at each of the branch switch end and the inlet side of the distribution transformer, and a wave recording device is installed at a preset position between the branch switch end and the inlet side of the distribution transformer.
Based on the first aspect, in some embodiments, the determining the type of the first fault according to the recording data includes:
if the characteristics of zero-sequence current and zero-sequence voltage are detected in a waveform diagram in the wave recording data, determining that the type of the first fault is a ground fault;
if the current increase, the voltage decrease and the current reversal of a certain two phases are detected in a waveform diagram in the wave recording data, determining that the type of the first fault is a two-phase fault;
and if the waveform graph in the wave recording data detects that three-phase current is increased and voltage is reduced, and zero-sequence current and zero-sequence voltage do not exist, determining that the type of the first fault is a three-phase fault.
Based on the first aspect, in some embodiments, the method further comprises:
and establishing a corresponding relation between the first setting value and the type of the first fault, and carrying out sensitivity inspection on the line.
In a second aspect, an embodiment of the present application provides a power distribution network protection constant value setting device, including:
the circuit fault detection device comprises an action time acquisition module, a fault detection module and a fault detection module, wherein the action time acquisition module is used for acquiring first action time of a main protection device in a circuit when a first fault occurs in the circuit and second action time of a backup protection device in the circuit when the first fault occurs in the circuit, and the first fault is any fault which can occur in the circuit;
a model establishing module, configured to establish an objective function of a setting optimization model according to the first action time and the second action time, where a constraint condition of the setting optimization model includes at least one of: the overcurrent protection device comprises overcurrent protection action characteristic constraint conditions, overcurrent protection device standard constraint conditions and main protection device and backup protection device matching constraint conditions;
the solving module is used for solving the setting optimization model through an ant colony algorithm and determining a first setting value of the line when the first fault occurs;
and the fault type determining module is used for acquiring the wave recording data when the first fault occurs through the wave recording equipment arranged on the feeder line and determining the type of the first fault according to the wave recording data.
In a third aspect, an embodiment of the present application provides a terminal device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor, when executing the computer program, implements the steps of the power distribution network protection fixed value setting method according to any one of the first aspect.
In a fourth aspect, an embodiment of the present application provides a power distribution network protection fixed value setting system, including the above terminal device and a plurality of wave recording devices, where the terminal device executes the following processes:
acquiring first action time of a main protection device in a line when a first fault occurs in the line and second action time of a backup protection device in the line when the first fault occurs in the line, wherein the first fault is any fault which can occur in the line;
establishing an objective function of a setting optimization model according to the first action time and the second action time, wherein the constraint conditions of the setting optimization model comprise at least one of the following items: the overcurrent protection device comprises overcurrent protection action characteristic constraint conditions, overcurrent protection device standard constraint conditions and main protection device and backup protection device matching constraint conditions;
solving the setting optimization model through an ant colony algorithm, and determining a first setting value of the line when the first fault occurs; and acquiring wave recording data when the first fault occurs through wave recording equipment arranged on a feeder line, and determining the type of the first fault according to the wave recording data.
In a fifth aspect, the present application provides a computer-readable storage medium, where a computer program is stored, and the computer program, when executed by a processor, implements the steps of the power distribution network protection fixed value setting method according to any one of the first aspect.
In a sixth aspect, an embodiment of the present application provides a computer program product, which, when running on a terminal device, causes the terminal device to execute the steps of the power distribution network protection fixed value setting method according to any one of the first aspect.
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In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a power distribution network protection constant value setting method provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a power distribution network protection constant value setting device provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
Detailed Description
The present application will be described more clearly with reference to specific examples. The following examples will assist those skilled in the art in further understanding the role of the present application, but are not intended to limit the application in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the application. All falling within the scope of protection of the present application.
To make the objects, technical solutions and advantages of the present application more clear, the following description is made by way of specific embodiments with reference to the accompanying drawings.
Fig. 1 shows a schematic flow diagram of a power distribution network protection constant value setting method provided by an embodiment of the present application. Referring to fig. 1, the power distribution network protection fixed value setting method may include steps 101 to 104.
Step 101, acquiring a first action time of a main protection device in a line when a first fault occurs in the line and a second action time of a backup protection device in the line when the first fault occurs in the line, wherein the first fault is any fault which can occur in the line.
In this step, the first fault may be any fault that can occur on the route, and the specific type of the first fault is not limited in this embodiment.
For example, the first action time of the main protection device of the same type is the same, the second action time of the backup protection device of the same type is the same, and the positions of the main protection device and the backup protection device in the line and the position of the fault point determine the number of the main protection device and the backup protection device which perform the protection action.
Illustratively, the line is provided with N1 main protection devices and N2 backup protection devices. The first action time of each main protection device is different because the position of each main protection device in the line is different. The second operation time of each backup protection device is different because the position of each backup protection device in the line is different. The first action time is related to information such as the position of the main protection device in the line and the position of the fault point, and the second action time is related to information such as the position of the backup protection device in the line and the position of the fault point.
102, establishing a target function of a setting optimization model according to the first action time and the second action time, wherein the constraint conditions of the setting optimization model comprise at least one of the following items: the overcurrent protection device comprises overcurrent protection action characteristic constraint conditions, overcurrent protection device standard constraint conditions and main protection device and backup protection device matching constraint conditions.
In some embodiments, the objective function may characterize a minimum of a sum of the first and second motion times. For example, the objective function may be:
Figure BDA0003272990480000081
wherein Z is the total number of the main protection devices, H is the total number of the backup protection devices, TiopFor the time of actuation of the primary protective device i in the first fault, TjopThe operation time of the backup protection device j in the first failure is shown.
For example, when a line fails, the main protection device first operates to promptly isolate the failure. If the main protection device fails, the backup protection device acts. Therefore, the second actuation time of the backup protection device should add a time step (e.g., a preset time difference) to the first actuation time of the primary protection device.
In some embodiments, the overcurrent protection action characteristic constraint condition may be:
Figure BDA0003272990480000082
wherein, TopFor the operating time of the overcurrent protection device, n1、n2Is a predetermined constant, IfaIs a fault current.
In some embodiments, the standard constraint condition of the over-current protection device may be:
TDSmin≤TDS≤TDSmax
Icdmin≤Icd≤Icdmax
wherein, TDSminUpper limit of time-setting coefficient, TDSmaxIs the lower limit of the time setting coefficient, IcdminTo lower limit of starting current, IcdmaxThe upper limit of the starting current.
In some embodiments, the constraint condition for the main protection device and the backup protection device to cooperate may be:
when a feeder line has a fault, if the main protection device fails to operate due to a fault, the backup protection device starts to operate, and the operating time of the main protection device and the operating time of the backup protection device meet Tjop＝Tiop+ Δ T, where TjopBeing said back-up protection meansTime of operation, TiopAnd delta T is the action time of the main protection device and is a preset time difference value.
And 103, solving the setting optimization model through an ant colony algorithm, and determining a first setting value of the line when the first fault occurs.
The idea of solving the setting optimization model through the ant colony algorithm is as follows: firstly, a basic random path is constructed, then the pheromone on each path is updated through a local optimal scheme, the pheromone is allowed to be repeatedly added only by selecting elite ants of a setting scheme which enables an objective function to be optimal, and finally, a global optimal solution is generated in the process of updating the pheromone.
Illustratively, the implementation process of step 103 may be:
constructing a basic random path (i, j);
at the t-th moment, the probability that the ant k walks to the path (i, j) is PijkAnd then:
Figure BDA0003272990480000091
in the formula, Sij(t) is the pheromone on path (i, j) at time t; eij(t) is the expectation function of ants going from node i to node j, Eij(t)＝1/Lij，LijIs the distance between nodes i and j; a is a pheromone influence factor, b is an expected influence factor;
at the t thnAt one time, pheromone Sij(tn) According to the formula:
Figure BDA0003272990480000092
update, in the formula: alpha is pheromone volatilization coefficient, delta Sij(t) pheromone increment left by the ant colony on path (i, j), K is the total number of ants in the ant colony;
Figure BDA0003272990480000093
the pheromone increment left by the kth ant when the kth ant passes through the path (i, j), and ST is the pheromone strength;
determining elite ants of a setting scheme for optimizing the objective function, increasing the intensity of pheromones left by the elite ants, and replacing paths taken by other ants with the current optimal paths, wherein the pheromone increment formula of the elite ants is as follows:
Figure BDA0003272990480000094
in the formula:
Figure BDA0003272990480000101
increase of pheromone of Elite ant, LbestThe optimal path length selected for elite ants, ST being the pheromone strength;
and repeating the steps until a global optimal solution is obtained.
And step 104, acquiring wave recording data when the first fault occurs through wave recording equipment arranged on the feeder line, and determining the type of the first fault according to the wave recording data.
For a main feeder line connection, at least three wave recording devices are installed between two section switches, the three wave recording devices are respectively located at more than three positions of the main feeder line connection, the first position is the position of a head end switch of the main feeder line connection, the second position is the position of a tail end switch of the main feeder line connection, and the rest positions are preset positions, located between the head end switch and the tail end switch, on the main feeder line connection.
For example, the preset positions may specifically be: the head end switch and the tail end switch are used as two end points of a line segment, and the preset position is located between a first range point and a second range point of the line segment. The first range point is a point corresponding to the 30% length of the line segment from the line segment to the head end switch, and the second range point is a point corresponding to the 30% length of the line segment from the line segment to the tail end switch. For example, the preset positions may be uniformly distributed between the first range point and the second range point.
For the feeder line branch, a wave recording device is respectively installed at the branch switch end and the inlet side of the distribution transformer, and a wave recording device is installed at a preset position between the branch switch end and the inlet side of the distribution transformer.
For example, the preset positions may specifically be: and the preset position is positioned between a first range point and a second range point of the line segment by taking the branch switch end and the inlet side of the distribution transformer as two end points of the line segment. The first range point is a point corresponding to the distance from the line segment to the branch switch end being 30% of the length of the line segment, and the second range point is a point corresponding to the distance from the line segment to the inlet side of the distribution transformer being 30% of the length of the line segment.
In some embodiments, the determining the type of the first fault according to the recording data includes:
if the characteristics of zero-sequence current and zero-sequence voltage are detected in a waveform diagram in the wave recording data, determining that the type of the first fault is a ground fault; if the current increase, the voltage decrease and the current reversal of a certain two phases are detected in a waveform diagram in the wave recording data, determining that the type of the first fault is a two-phase fault; and if the waveform graph in the wave recording data detects that three-phase current is increased and voltage is reduced, and zero-sequence current and zero-sequence voltage do not exist, determining that the type of the first fault is a three-phase fault.
By way of example, the recording device may be a recording sensor.
Optionally, in some embodiments, the power distribution network protection constant value setting method may further include:
and 105, establishing a corresponding relation between the first setting value and the type of the first fault, and carrying out sensitivity inspection on the line.
The power distribution network protection constant value setting method has the following advantages:
1. compared with the traditional three-section type current protection, the embodiment of the application is more suitable for the condition that the power flow direction of a power grid is changed due to the boost current generated by the distributed power supply, and the setting of the relay protection device constant value is more flexible.
2. The setting optimization model takes the action time of the minimized main protection device and the backup protection device as an optimization target, and the sensitivity and the quick action performance of protection are better.
3. The fault current is detected in real time based on the wave recording equipment installed on the feeder line, the flexibility of setting the fixed value of the relay protection device of the power distribution network is improved, and the malfunction, misoperation and missing of the protection device are effectively avoided.
4. The fault type can be accurately judged through real-time wave recording data of the wave recording equipment arranged on the feeder line, corresponding protection fixed values are adaptively matched according to different fault types, and the reliability of the protection device is improved.
5. The relay protection device constant value is flexibly set according to the real-time operation condition of the power distribution network and the network topological structure, and information support and decision participation are provided for an on-duty dispatcher to safely and quickly process the power grid sudden accidents.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Referring to fig. 2, an embodiment of the present application provides a power distribution network protection constant value setting device 200, including: an action time acquisition module 210, a model building module 220, a solving module 230, and a fault type determination module 240.
The action time acquiring module 210 is configured to acquire a first action time of a main protection device in a line when a first fault occurs in the line, and a second action time of a backup protection device in the line when the first fault occurs in the line, where the first fault is any fault that can occur in the line.
A model establishing module 220, configured to establish an objective function of a tuning optimization model according to the first action time and the second action time, where a constraint condition of the tuning optimization model includes at least one of: the overcurrent protection device comprises overcurrent protection action characteristic constraint conditions, overcurrent protection device standard constraint conditions and main protection device and backup protection device matching constraint conditions.
And a solving module 230, configured to solve the setting optimization model through an ant colony algorithm, and determine a first setting value of the line when the first fault occurs.
And a fault type determining module 240, configured to obtain, by a wave recording device arranged on the feeder line, wave recording data when the first fault occurs, and determine the type of the first fault according to the wave recording data.
Fig. 3 is a schematic diagram of a terminal device according to an embodiment of the present invention. The terminal device 300 of this embodiment includes: a processor 301, a memory 302 and a computer program stored in said memory 302 and executable on said processor 301, such as a thermal power plant water data sample set generation program or a thermal power plant water usage assessment program. The processor 301, when executing the computer program, implements the steps in the above-described embodiment of the fault type determination method, such as the steps 101 to 104 shown in fig. 1. Alternatively, the processor 301, when executing the computer program, implements the functions of the modules in the above device embodiments, for example, the functions of the modules 210 to 240 shown in fig. 2.
Illustratively, the computer program may be partitioned into one or more modules that are stored in the memory 302 and executed by the processor 301 to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program in the terminal device 300. For example, the computer program may be driven by an action time acquisition module, a model building module, a solving module, and a fault type determination module.
The terminal device 300 may be a mobile phone, a tablet computer, a wearable device, an in-vehicle device, an Augmented Reality (AR)/Virtual Reality (VR) device, an ultra-mobile personal computer (UMPC), a netbook, a Personal Digital Assistant (PDA), a desktop computer, a notebook, a palmtop, a cloud server, or the like. The terminal device may include, but is not limited to, a processor 301, a memory 302. Those skilled in the art will appreciate that fig. 3 is merely an example of a terminal device 300 and does not constitute a limitation of terminal device 300 and may include more or fewer components than shown, or some components may be combined, or different components, for example, the terminal device may also include input output devices, network access devices, buses, etc.
The Processor 301 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 302 may be an internal storage unit of the terminal device 300, such as a hard disk or a memory of the terminal device 300. The memory 302 may also be an external storage device of the terminal device 300, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 300. Further, the memory 302 may also include both an internal storage unit and an external storage device of the terminal device 300. The memory 302 is used for storing the computer programs and other programs and data required by the terminal device. The memory 302 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. . Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims (10)

1. A power distribution network protection constant value setting method is characterized by comprising the following steps:
acquiring first action time of a main protection device in a line when a first fault occurs in the line and second action time of a backup protection device in the line when the first fault occurs in the line, wherein the first fault is any fault which can occur in the line;
establishing an objective function of a setting optimization model according to the first action time and the second action time, wherein the constraint conditions of the setting optimization model comprise at least one of the following items: the overcurrent protection device comprises overcurrent protection action characteristic constraint conditions, overcurrent protection device standard constraint conditions and main protection device and backup protection device matching constraint conditions;
solving the setting optimization model through an ant colony algorithm, and determining a first setting value of the line when the first fault occurs; and acquiring wave recording data when the first fault occurs through wave recording equipment arranged on a feeder line, and determining the type of the first fault according to the wave recording data.
2. The power distribution network protection constant value setting method according to claim 1, wherein the objective function is:
Figure FDA0003272990470000011
wherein Z is the total number of the main protection devices, H is the total number of the backup protection devices, TiopFor the time of actuation of the primary protective device i in the first fault, TjopThe operation time of the backup protection device j in the first failure is shown.
3. The power distribution network protection constant value setting method according to claim 1 or 2, wherein the overcurrent protection action characteristic constraint condition is:
Figure FDA0003272990470000012
wherein, TopFor the operating time of the overcurrent protection device, n1、n2Is a predetermined constant, IfaIs a fault current;
the standard constraint conditions of the overcurrent protection device are as follows:
TDSmin≤TDS≤TDSmax
Icdmin≤Icd≤Icdmax
wherein, TDSminUpper limit of time-setting coefficient, TDSmaxIs the lower limit of the time setting coefficient, IcdminTo lower limit of starting current, IcdmaxIs the upper limit of the starting current;
the main protection device and the backup protection device are matched with the constraint conditions that:
when a feeder line has a fault, if the main protection device fails to operate due to a fault, the backup protection device starts to operate, and the operating time of the main protection device and the operating time of the backup protection device meet Tjop＝Tiop+ Δ T, where TjopFor the actuation time of the backup protection device, TiopAnd delta T is the action time of the main protection device and is a preset time difference value.
4. The power distribution network protection constant value setting method according to claim 1, wherein the process of solving the setting optimization model through the ant colony algorithm is as follows:
constructing a basic random path (i, j);
at the t-th moment, the probability that the ant k walks to the path (i, j) is PijkAnd then:
Figure FDA0003272990470000021
in the formula, Sij(t) is the pheromone on path (i, j) at time t; eij(t) is the expectation function of ants going from node i to node j, Eij(t)＝1/Lij，LijIs the distance between nodes i and j; a is a pheromone influence factor, b is an expected influence factor;
at the t thnAt one time, pheromone Sij(tn) According to the formula:
Figure FDA0003272990470000022
update, in the formula: alpha is pheromone volatilization coefficient, delta Sij(t) pheromone increment left by the ant colony on path (i, j), K is the total number of ants in the ant colony;
Figure FDA0003272990470000023
the pheromone increment left by the kth ant when the kth ant passes through the path (i, j), and ST is the pheromone strength;
determining elite ants of a setting scheme for optimizing the objective function, increasing the intensity of pheromones left by the elite ants, and replacing paths taken by other ants with the current optimal paths, wherein the pheromone increment formula of the elite ants is as follows:
Figure FDA0003272990470000031
in the formula:
Figure FDA0003272990470000032
increase of pheromone of Elite ant, LbestThe optimal path length selected for elite ants, ST being the pheromone strength;
and repeating the steps until a global optimal solution is obtained.
5. The distribution network protection fixed value setting method according to claim 1, wherein for a feeder line main connection, at least three wave recording devices are installed between two section switches, the three wave recording devices are respectively located at three or more positions of the feeder line main connection, a first position is a head end switch position of the feeder line main connection, a second position is a tail end switch position of the feeder line main connection, and the rest positions are preset positions on the feeder line main connection between the head end switch and the tail end switch.
6. The distribution network protection constant value setting method according to claim 1, wherein for the feeder branch, a wave recording device is installed at each of the branch switch end and the inlet side of the distribution transformer, and a wave recording device is installed at a predetermined position between the branch switch end and the inlet side of the distribution transformer.
7. The power distribution network protection fixed value setting method according to claim 1, wherein the determining the type of the first fault according to the recording data includes:
if the characteristics of zero-sequence current and zero-sequence voltage are detected in a waveform diagram in the wave recording data, determining that the type of the first fault is a ground fault;
if the current increase, the voltage decrease and the current reversal of a certain two phases are detected in a waveform diagram in the wave recording data, determining that the type of the first fault is a two-phase fault;
and if the waveform graph in the wave recording data detects that three-phase current is increased and voltage is reduced, and zero-sequence current and zero-sequence voltage do not exist, determining that the type of the first fault is a three-phase fault.
8. The power distribution network protection constant value setting method according to claim 1, further comprising:
and establishing a corresponding relation between the first setting value and the type of the first fault, and carrying out sensitivity inspection on the line.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor when executing the computer program implements the steps of the distribution network protection fixed value setting method according to any of the above claims 1 to 8.
10. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, carries out the steps of the distribution network protection rating setting method according to any of the preceding claims 1 to 8.
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