CN113922343B - 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 PDFInfo
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- CN113922343B CN113922343B CN202111107788.2A CN202111107788A CN113922343B CN 113922343 B CN113922343 B CN 113922343B CN 202111107788 A CN202111107788 A CN 202111107788A CN 113922343 B CN113922343 B CN 113922343B
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- 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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N3/00—Computing arrangements based on biological models
- G06N3/004—Artificial life, i.e. computing arrangements simulating life
- G06N3/006—Artificial life, i.e. computing arrangements simulating life based on simulated virtual individual or collective life forms, e.g. social simulations or particle swarm optimisation [PSO]
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/04—Constraint-based CAD
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/04—Power grid distribution networks
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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
- 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
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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
- 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
Abstract
The application is suitable for the technical field of power distribution networks and provides a power distribution network protection fixed value setting method, terminal equipment and a storage medium. The method comprises the following steps: 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 when the first fault occurs in the line; establishing an objective function of a setting optimization model according to the first action time and the second action time; solving the setting 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 feed line, and determining the type of the first fault according to the wave recording data. The method and the device can not influence the access of the large-capacity distributed power supply to the power distribution network, and effectively improve the action time and the protection range of the relay protection device of the power distribution network.
Description
Technical Field
The application relates to the technical field of power distribution networks, in particular to a power distribution network protection fixed 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, and is greatly connected into a power grid. 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 reliability of the power distribution network. The auxiliary current of the distributed power grid connection to the feeder fault point changes the single direction and the current of the feeder power flow, so that the fixed value setting difficulty of the relay protection device of the power distribution network is increased, the problems of refusal of power distribution network protection, misoperation, improper upper and lower level matching and the like are possibly caused, the safe and stable operation of the power distribution network is greatly influenced, and greater challenges are brought to the action speed and the protection range of the power distribution network protection.
The grid connection of the large-capacity distributed power supply makes the setting method and the matching mode of the power distribution network protection more complex, and the traditional three-section current protection is not applicable any more. Aiming at the challenges brought by the grid connection of the large-capacity distributed power supply, the existing protection scheme is to cut off the access of most of the distributed power supplies in the power distribution network when faults occur, or to reduce the short-circuit current injected into the feeder fault point by the distributed power supply by using a current limiter so as to ensure the correct action of the original protection. The method has no great change to the original protection, has certain economical efficiency, but greatly limits the access capacity of the distributed power supply, influences the quick action, sensitivity and selectivity of the protection, and does not meet the long-term development goal of large-capacity grid connection of the distributed power supply.
Disclosure of Invention
In view of this, the embodiment of the application provides a power distribution network protection fixed value setting method, terminal equipment and storage medium, which cannot affect the access of a large-capacity distributed power supply to a power distribution network.
In order to achieve the above purpose, the present application adopts the following technical scheme:
in a first aspect, an embodiment of the present application provides a method for setting a protection setting value of a power distribution network, including:
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 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 tuning optimization model according to the first action time and the second action time, wherein the constraint condition of the tuning optimization model comprises at least one of the following: the method comprises the steps of overcurrent protection action characteristic constraint conditions, overcurrent protection device standard constraint conditions and constraint conditions of matching of a main protection device and a backup protection device;
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 the wave recording data when the first fault occurs through wave recording equipment arranged on a feed line, and determining the type of the first fault according to the wave recording data.
In the embodiment of the application, an objective function of a setting optimization model is established according to a first action time of a main protection device when a first fault occurs in a circuit and a second action time of a backup protection device when the first fault occurs in the circuit, 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 feed 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 embodiment of the application cannot influence the large-capacity distributed power supply to be connected into the power distribution network because of not having directivity and possibly generating misoperation and even refusing operation, can solve the problem that the large-capacity distributed power supply is connected into the power distribution network and brings about the protection of the power distribution network, effectively improves the action time and the protection range of the relay protection device of the power distribution network, and provides assistance for safe and reliable operation of the power distribution network comprising the large-capacity distributed power supply.
Based on the first aspect, in some embodiments, the objective function is:
wherein Z is the total number of the main protection devices, H is the total number of the backup protection devices, and T iop For the action time of the main protection i under the first fault, T jop The action time of the backup protection j under the first fault.
Based on the first aspect, in some embodiments, the over-current protection action characteristic constraint is:
wherein T is op For the action time of the overcurrent protection device, n 1 、n 2 For a preset constant, I fa Is a fault current;
the standard constraint conditions of the overcurrent protection device are as follows:
TDS min ≤TDS≤TDS max
I cdmin ≤I cd ≤I cdmax
wherein the TDS min For setting the upper limit of the coefficient for time, TDS max For setting the lower limit of the coefficient for time, I cdmin To lower the starting current limit, I cdmax Is the upper limit of the starting current;
the main protection device and the backup protection device are matched with constraint conditions that:
when the feeder line fails, if the main protection device fails to operate due to accident, the backup protection device starts to operate, and the operation time of the main protection device and the operation time of the backup protection device meet T jop ＝T iop +ΔT, where T jop For the action time of the backup protection device, T iop And delta T is a preset time difference value for the action time of the main protection device.
Based on the first aspect, in some embodiments, the process of solving the tuning optimization model by the ant colony algorithm is:
constructing a basic random path (i, j);
at time t, the probability of ant k going to path (i, j) is P ijk Then:
wherein S is ij (t) is the pheromone on path (i, j) at time t; e (E) ij (t) is the expected function of ants going from node i to node j, E ij (t)＝1/L ij ，L ij Is the distance between nodes i and j; a is a pheromone influence factor, b is a desired influence factor;
at t n At a moment, pheromone S ij (t n ) According to the formula:
updating, wherein: alpha is the volatilization coefficient of the pheromone, delta S ij (t) is the pheromone increment left by the ant colony on the path (i, j), and K is the total number of ants in the ant colony;for the kth ant to pass through the path(i, j) the pheromone increment left over, ST being the pheromone intensity;
determining elite ants of a setting scheme for optimizing an objective function, increasing the intensity of pheromones left by the elite ants, and replacing paths taken by other ants by using a current optimal path, wherein the pheromone increment formula of the elite ants is as follows:
wherein:is the pheromone increment of elite ants, L best The optimal path length selected for elite ants, ST is pheromone intensity;
repeating the steps until the global optimal solution is obtained.
Based on the first aspect, in some embodiments, for the feeder main wiring, at least three wave recording devices are installed between the two section switches, the three wave recording devices are respectively located at three or more positions of the feeder main wiring, the first position is a head end switch position of the feeder main wiring, the second position is an end switch position of the feeder main wiring, and the rest positions are preset positions located between the head end switch and the end switch on the feeder main wiring.
Based on the first aspect, in some embodiments, for the feeder branch, one wave recording device is installed at each of the branch switch end and the distribution transformer inlet side, and one wave recording device is installed at a preset position between the branch switch end and the distribution transformer inlet side.
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 the zero sequence current and the zero sequence voltage are detected in the oscillogram in the recorded wave 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 the waveform diagram in the wave recording data, determining that the type of the first fault is a two-phase fault;
and if the three-phase current increase and the voltage decrease are detected in the waveform diagram in the recorded data, and no zero-sequence current and no zero-sequence voltage are detected, 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 performing sensitivity inspection on the line.
In a second aspect, an embodiment of the present application provides a power distribution network protection fixed value setting straightening device, including:
the system comprises an action time acquisition module, a backup protection device and a protection device, wherein the action time acquisition module is used for 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 the backup protection device when the first fault occurs in the line, and the first fault is any fault which can occur in the line;
the model building module is used for building an objective function of a setting optimization model according to the first action time and the second action time, and the constraint condition of the setting optimization model comprises at least one of the following: the method comprises the steps of overcurrent protection action characteristic constraint conditions, overcurrent protection device standard constraint conditions and constraint conditions of matching of a main protection device and a backup protection device;
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;
the fault type determining module is used for acquiring the wave recording data when the first fault occurs through wave recording equipment arranged on the feed 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, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the steps of the method for setting a protection setting value of a power distribution network according to any one of the first aspect are implemented when the processor executes the computer program.
In a fourth aspect, an embodiment of the present application provides a power distribution network protection setting system, including the above terminal device and a plurality of wave recording devices, where the terminal device performs the following process:
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 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 tuning optimization model according to the first action time and the second action time, wherein the constraint condition of the tuning optimization model comprises at least one of the following: the method comprises the steps of overcurrent protection action characteristic constraint conditions, overcurrent protection device standard constraint conditions and constraint conditions of matching of a main protection device and a backup protection device;
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 the wave recording data when the first fault occurs through wave recording equipment arranged on a feed line, and determining the type of the first fault according to the wave recording data.
In a fifth aspect, embodiments of the present application provide a computer-readable storage medium storing a computer program, which when executed by a processor implements the steps of the power distribution network protection setting method according to any one of the first aspects above.
In a sixth aspect, embodiments of the present application provide a computer program product, which when run on a terminal device, causes the terminal device to perform the steps of the power distribution network protection setting method according to any one of the first aspects above.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a method for setting a protection setting value of a power distribution network according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a power distribution network protection fixed value setting device provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a terminal device provided in an embodiment of the present application.
Detailed Description
The present application will be more clearly described with reference to the following specific examples. The following examples will assist those skilled in the art in further understanding the function of the present application, but are not intended to limit the present application in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the spirit of the present application. These are all within the scope of the present application.
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the following description will be made with reference to the accompanying drawings by way of specific embodiments.
Fig. 1 shows a flow chart of a method for setting a protection setting value of a power distribution network according to an embodiment of the present application. Referring to fig. 1, the method for setting the protection setting value of the power distribution network may include steps 101 to 104.
Step 101, obtaining 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 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 in the above-mentioned route, and the specific type of the first fault is not limited in this embodiment.
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 positions of fault points determine the number of the main protection device and the backup protection device which execute the protection action.
Illustratively, N1 main protection devices and N2 backup protection devices are arranged on the line. The first operation time of each main protection device is different because the positions of each main protection device in the line are 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 circuit 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 circuit and the position of the fault point.
Step 102, establishing an objective function of a tuning optimization model according to the first action time and the second action time, wherein the constraint condition of the tuning optimization model comprises at least one of the following: the method comprises the steps of overcurrent protection action characteristic constraint conditions, overcurrent protection device standard constraint conditions and constraint conditions of matching of a main protection device and a backup protection device.
In some embodiments, the objective function may represent a minimum value of a sum of the first action time and the second action time. For example, the objective function may be:
wherein Z is the total number of the main protection devices, H is the total number of the backup protection devices, and T iop For the action time of the main protection device i under the first fault, T jop The operation time of the backup protection device j in the first failure.
For example, when a line fails, the main protection device first operates to quickly isolate the failure. If the primary protection fails, the backup protection acts. Thus, the second action time of the backup protection device should add a time step (e.g., a preset time difference) to the first action time of the primary protection device.
In some embodiments, the over-current protection action characteristic constraint may be:
wherein T is op For the action time of the overcurrent protection device, n 1 、n 2 For a preset constant, I fa Is a fault current.
In some embodiments, the over-current protection device standard constraint may be:
TDS min ≤TDS≤TDS max
I cdmin ≤I cd ≤I cdmax
wherein the TDS min For setting the upper limit of the coefficient for time, TDS max For setting the lower limit of the coefficient for time, I cdmin To lower the starting current limit, I cdmax Is the upper limit of the starting current.
In some embodiments, the constraint of the main protection device and the backup protection device may be:
when the feeder line fails, if the main protection device fails to operate due to accident, the backup protection device starts to operate, and the operation time of the main protection device and the operation time of the backup protection device meet T jop ＝T iop +ΔT, where T jop For the action time of the backup protection device, T iop And delta T is a preset time difference value for the action time of the main protection device.
And step 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 thought of solving the setting optimization model through the ant colony algorithm is as follows: firstly, constructing a basic random path, then updating the pheromone on each path through a local optimal scheme, allowing the pheromone to be repeatedly added only by elite ants of a setting scheme which enables an objective function to be optimal, and finally generating a global optimal solution in the pheromone updating process.
Illustratively, the implementation of step 103 may be:
constructing a basic random path (i, j);
at time t, the probability of ant k going to path (i, j) is P ijk Then:
wherein S is ij (t) is the pheromone on path (i, j) at time t; e (E) ij (t) is the expected function of ants going from node i to node j, E ij (t)＝1/L ij ，L ij Is the distance between nodes i and j; a is a pheromone influence factor, b is a desired influence factor;
at t n At a moment, pheromone S ij (t n ) According to the formula:
updating, wherein: alpha is the volatilization coefficient of the pheromone, delta S ij (t) is the pheromone increment left by the ant colony on the path (i, j), and K is the total number of ants in the ant colony;for the increment of the pheromone left when the kth ant passes through the path (i, j), ST is the intensity of the pheromone;
determining elite ants of a setting scheme for optimizing an objective function, increasing the intensity of pheromones left by the elite ants, and replacing paths taken by other ants by using a current optimal path, wherein the pheromone increment formula of the elite ants is as follows:
wherein:is the pheromone increment of elite ants, L best The optimal path length selected for elite ants, ST is pheromone intensity;
repeating the steps until the global optimal solution is obtained.
Step 104, acquiring wave recording data when the first fault occurs through wave recording equipment arranged on a feed line, and determining the type of the first fault according to the wave recording data.
For the feeder main wiring, at least three wave recording devices are arranged between two sectioning switches, the three wave recording devices are respectively positioned at more than three positions of the feeder main wiring, the first position is the position of a head end switch of the feeder main wiring, the second position is the position of a tail end switch of the feeder main wiring, and the rest positions are preset positions on the feeder main wiring between the head end switch and the tail end switch.
For example, the preset position may specifically be: the head switch and the tail switch are used as two endpoints 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 on the line segment, the distance from the first range point to the head switch is 30% of the length of the line segment, and the second range point is a point on the line segment, the distance from the second range point to the tail switch is 30% of the length of the line segment. For example, the preset positions may be uniformly distributed between the first range point and the second range point.
For the feeder branch, a wave recording device is respectively arranged at the branch switch end and the inlet side of the distribution transformer, and a wave recording device is arranged at a preset position between the branch switch end and the inlet side of the distribution transformer.
For example, the preset position may specifically be: the branch switch end and the distribution transformer inlet side are taken as two endpoints of a line segment, and the preset position is positioned between a first range point and a second range point of the line segment. The first range point is a point on the line segment, the distance from the first range point to the branch switch end corresponds to 30% of the length of the line segment, and the second range point is a point on the line segment, the distance from the second range point to the inlet side of the distribution transformer corresponds to 30% of the length of the line segment.
In some embodiments, determining the type of the first fault according to the recording data includes:
if the characteristics of the zero sequence current and the zero sequence voltage are detected in the oscillogram in the recorded wave 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 the waveform diagram in the wave recording data, determining that the type of the first fault is a two-phase fault; and if the three-phase current increase and the voltage decrease are detected in the waveform diagram in the recorded data, and no zero-sequence current and no zero-sequence voltage are detected, determining that the type of the first fault is a three-phase fault.
By way of example, the wave recording device may be a wave recording sensor.
Optionally, in some embodiments, the method for setting a protection setting value of a power distribution network may further include:
and 105, establishing a corresponding relation between the first setting value and the type of the first fault, and performing sensitivity inspection on the line.
The method for setting the protection fixed value of the power distribution network 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 trend direction of the power grid is changed due to the auxiliary current generated by the distributed power supply, and the fixed value of the relay protection device is set more flexibly.
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 protection sensitivity and the quick action are better.
3. Based on the real-time detection of fault current of the wave recording equipment arranged on the feed line, the flexibility of setting the set value of the relay protection device of the power distribution network is improved, and the refusal, the misoperation and the leakage of the protection device are effectively avoided.
4. The fault type can be accurately judged through real-time wave recording data of wave recording equipment arranged on the feed line, corresponding protection fixed values are adaptively matched according to different fault types, and the reliability of the protection device is improved.
5. And flexibly setting the fixed value of the relay protection device according to the real-time operation condition and the network topological structure of the power distribution network, and providing information support and decision-making participation for the on-duty dispatcher to safely and rapidly process the sudden accident of the power grid.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not limit the implementation process of the embodiment of the present application in any way.
Referring to fig. 2, an embodiment of the present application provides a power distribution network protection setting device 200, including: an action time acquisition module 210, a model creation module 220, a solution module 230, and a fault type determination module 240.
The action time obtaining module 210 is configured to obtain 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 when the first fault occurs in the line, where the first fault is any fault that can occur in the line.
The model building module 220 is configured to build an objective function of a tuning optimization model according to the first action time and the second action time, where constraints of the tuning optimization model include at least one of the following: the method comprises the steps of overcurrent protection action characteristic constraint conditions, overcurrent protection device standard constraint conditions and constraint conditions of matching of a main protection device and a backup protection device.
And the solving module 230 is 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.
The fault type determining module 240 is configured to obtain, by using a wave recording device provided on a feeder, wave recording data when the first fault occurs, and determine a 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 the memory 302 and executable on the processor 301, such as a generation program of a thermal power plant water data sample set or a thermal power plant water evaluation program. The processor 301, when executing the computer program, implements the steps in the above-described fault type determining method embodiment, for example steps 101 to 104 shown in fig. 1. Alternatively, the processor 301 may implement the functions of the modules in the above-described embodiments of the apparatus, such as the functions of the modules 210 to 240 shown in fig. 2, when executing the computer program.
Illustratively, the computer program may be split into one or more modules that are stored in the memory 302 and executed by the processor 301 to perform the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the terminal device 300. For example, the computer program may be executed by an action time acquisition module, a model building module, a solution module, and a fault type determination module.
The terminal device 300 may be a mobile phone, a tablet computer, a wearable device, a vehicle-mounted device, an Augmented Reality (AR)/Virtual Reality (VR) device, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (personal digital assistant, PDA), a desktop computer, a notebook, a palm computer, a cloud server, and the like. The terminal device may include, but is not limited to, a processor 301, a memory 302. It will be appreciated by those skilled in the art that fig. 3 is merely an example of a terminal device 300 and is not limiting of the terminal device 300, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the terminal device may also include input and output devices, network access devices, buses, etc.
The processor 301 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. 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) or 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 program 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-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment 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, where the integrated units may be implemented in a form of hardware or a form of a 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 process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
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 solution. 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 manners. For example, the apparatus/terminal device embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical function division, and there may be additional divisions in actual implementation, e.g., multiple units 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 may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
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 on 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 integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. . Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; 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, and are intended to be included in the scope of the present invention.
Claims (7)
1. The utility model provides a distribution network protection definite value setting method which is characterized in that the method includes:
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 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 tuning optimization model according to the first action time and the second action time, wherein the constraint condition of the tuning optimization model comprises at least one of the following: the method comprises the steps of overcurrent protection action characteristic constraint conditions, overcurrent protection device standard constraint conditions and constraint conditions of matching of a main protection device and a backup protection device;
solving the setting optimization model through an ant colony algorithm, and determining a first setting value of the line when the first fault occurs; acquiring wave recording data when the first fault occurs through wave recording equipment arranged on a feed line, and determining the type of the first fault according to the wave recording data;
the objective function is:
wherein, the liquid crystal display device comprises a liquid crystal display device,Zfor the total number of the primary protection devices,Hfor the total number of backup protection devices,T iop for primary protection in the event of a first faultiIs used for the operation time of the device,T jop backup protection device for first faultjIs set according to the action time of the device;
the constraint conditions of the overcurrent protection action characteristics are as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,T op for the action time of the overcurrent protection device,n 1 、n 2 in order to set the constant value of the preset value,I fa is a fault current;
the standard constraint conditions of the overcurrent protection device are as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,TDS min for the upper limit of the time-setting coefficient,TDS max for the lower limit of the time-setting coefficient,I cdmin in order to start up the lower limit of the current,I cdmax is the upper limit of the starting current;
the main protection device and the backup protection device are matched with constraint conditions that:
when the feeder line fails, if the main protection device fails to operate due to accident, the backup protection device starts to operate, and the operation time of the main protection device and the operation time of the backup protection device meet the requirement ofWherein->For the actuation time of the backup protection, < >>For the actuation time of the main protection device, < >>Is a preset time difference value;
the determining the type of the first fault according to the recording data comprises the following steps:
if the characteristics of the zero sequence current and the zero sequence voltage are detected in the oscillogram in the recorded wave 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 the waveform diagram in the wave recording data, determining that the type of the first fault is a two-phase fault;
and if the three-phase current increase and the voltage decrease are detected in the waveform diagram in the recorded data, and no zero-sequence current and no zero-sequence voltage are detected, determining that the type of the first fault is a three-phase fault.
2. The method for setting a protection setting value of a power distribution network according to claim 1, wherein the process of solving the setting optimization model by an ant colony algorithm is as follows:
constructing a basic random pathi,j)；
In the first placetAt every moment, antskTravel to the path [ ]i,j) The probability of (2) isP ijk Then:
in the method, in the process of the invention,is the firsttEvery moment, the path [ ]i,j) A pheromone thereon; />Is an ant slave nodeiWalk to nodejIs>，L ij Is a nodeiAndja distance therebetween;aas the pheromone influencing factor,bis a desired influencing factor;
in the first placet n At each moment, pheromoneAccording to the formula:
updating, wherein:is the volatile coefficient of pheromone, < >>Is an ant colony on the wayi,j) The pheromone increment left over on the upper part,Kis the total number of ants in the ant colony; />Is the firstkOnly ants pass through the pathi,j) The pheromone increment left in the process,STis the intensity of pheromone;
determining elite ants of a setting scheme for optimizing an objective function, increasing the intensity of pheromones left by the elite ants, and replacing paths taken by other ants by using a current optimal path, wherein the pheromone increment formula of the elite ants is as follows:
wherein:is the pheromone increment of elite ants,L best the optimal path length chosen for elite ants,STis the intensity of pheromone;
repeating the steps until the global optimal solution is obtained.
3. The method for setting a protection setting value of a power distribution network according to claim 1, wherein for a feeder main wiring, at least three wave recording devices are installed between two sectionalizing switches, the three wave recording devices are respectively located at three or more positions of the feeder main wiring, the first position is a head end switch position of the feeder main wiring, the second position is a tail end switch position of the feeder main wiring, and the rest positions are preset positions located between the head end switch and the tail end switch on the feeder main wiring.
4. The method for setting a protection setpoint for a power distribution network according to claim 1, wherein for the feeder branch, a wave recording device is installed at each of the branch switch end and the distribution transformer inlet side, and a wave recording device is installed at a predetermined position between the branch switch end and the distribution transformer inlet side.
5. The power distribution network protection 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 performing sensitivity inspection on the line.
6. Terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, realizes the steps of the power distribution network protection setting method according to any of the preceding claims 1 to 5.
7. A computer-readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the power distribution network protection setting method according to any one of the preceding claims 1 to 5.
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| CN109586256A (en) * | 2018-12-05 | 2019-04-05 | 燕山大学 | A kind of power distribution network overcurrent protection method and setting optimization method, optimization system containing distributed generation resource |
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| CN109586256A (en) * | 2018-12-05 | 2019-04-05 | 燕山大学 | A kind of power distribution network overcurrent protection method and setting optimization method, optimization system containing distributed generation resource |
| CN111948491A (en) * | 2020-08-12 | 2020-11-17 | 国网山东省电力公司聊城供电公司 | Transient signal-based active power distribution network multi-terminal quantity fault identification method and system |
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