CN110768198B - 10kV overhead insulated line lightning stroke disconnection comprehensive protection optimization method and device - Google Patents
10kV overhead insulated line lightning stroke disconnection comprehensive protection optimization method and device Download PDFInfo
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- CN110768198B CN110768198B CN201911183273.3A CN201911183273A CN110768198B CN 110768198 B CN110768198 B CN 110768198B CN 201911183273 A CN201911183273 A CN 201911183273A CN 110768198 B CN110768198 B CN 110768198B
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The disclosure provides a lightning stroke and disconnection comprehensive protection optimization method and device for a 10kV overhead insulated line. Wherein the method comprises the following steps: acquiring a power distribution network topological structure, associated equipment parameters and the number of users, and constructing a power distribution network simulation model; based on a power distribution network simulation model, simulating the distribution line by induction lightning stroke to obtain the line breakage rate and influence users of the simulated distribution line in an unprotected mode and in two protection modes, namely a lightning conductor and a lightning arrester; dividing the product of the influence of the broken line of the distribution line i and the broken line rate of the j protection mode selected by the distribution line i by the total number of users to obtain an average interruption frequency index of the distribution line i in the j protection mode selected by the distribution line i; constructing a target function according to the minimum value of the average interruption frequency index, and obtaining the optimal protection mode of the corresponding distribution line by utilizing a particle swarm optimization algorithm; i represents any distribution line; j is 1,2, 3; j ═ 1 represents an unprotected mode; j is 2 to represent a lightning conductor protection mode; j-3 indicates the lightning arrester protection mode.
Description
Technical Field
The disclosure belongs to the field of distribution lightning stroke protection, and particularly relates to a lightning stroke broken line comprehensive protection optimization method and device for a 10kV overhead insulated line.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In recent years, according to the statistics of medium-voltage distribution line accidents, the number of faults of an insulated conductor in operation is 15.3% of the total number of faults of a distribution network, and the number of faults is obviously reduced compared with that of a bare conductor; wherein the lightning stroke accidents of the insulated conductor account for 36.8 percent of the total accidents of the insulated conductor, and the lightning stroke breakage rate is 96.8 percent. The statistical data reflects that the lightning breakage probability of the insulated conductor is high, and the statistical data shows that the insulated conductor is almost inevitably damaged in a lightning accident, and the breakage probability is high. According to domestic statistics, the lightning stroke broken line accidents of the 10kV overhead insulated conductor account for a large part of the total lightning stroke broken line number. Lightning stroke breakage accidents of a plurality of insulated conductors occur in China. In China, after the Guangdong, Shenzhen, Beijing and other cities are gradually and commonly used in the insulated conductor, the disconnection accident caused by lightning stroke also occurs for many times in thunderstorm weather. Therefore, the lightning stroke breakage is an important cause of the operation accident of the insulated conductor. The inventor finds that the simulation precision of the prior 10kV overhead line lightning stroke broken line comprehensive protection is low, and the practicability is poor.
Disclosure of Invention
In order to solve the above problems, a first aspect of the present disclosure provides a lightning-strike disconnection comprehensive protection optimization method for a 10kV overhead insulated line, which can improve the reliability of lightning-strike-disconnection protection and realize the minimization of the lightning-strike disconnection rate of a power distribution network.
The first aspect of the disclosure provides a lightning stroke disconnection comprehensive protection optimization method for a 10kV overhead insulated line, which comprises the following steps:
acquiring a power distribution network topological structure, associated equipment parameters and the number of users, and constructing a power distribution network simulation model;
carrying out induction lightning distribution line simulation based on a power distribution network simulation model to obtain the line breakage rate and the number of influencing users of the simulated distribution line in an unprotected mode and in two protection modes, namely a lightning conductor and a lightning arrester; the disconnection rate is equal to the product of the total lightning number on the distribution line, the arcing rate and the probability that the lightning current exceeds the critical current of flashover lightning;
dividing the product of the number of influencing users after the distribution line i is disconnected and the disconnection rate of the distribution line i in the jth protection mode selected by the total number of users to obtain an average interruption frequency index of the distribution line i in the jth protection mode selected by the jth user; constructing a target function according to the minimum value of the average interruption frequency index of the current distribution line, and solving the optimal protection mode of the corresponding distribution line by taking the total cost not exceeding the total investment amount as a constraint condition; wherein i represents any distribution line, and is a positive integer greater than or equal to 1; j is 1,2, 3; j ═ 1 represents an unprotected mode; j is 2 to represent a lightning conductor protection mode; j-3 indicates the lightning arrester protection mode.
The second aspect of the present disclosure provides a 10kV overhead insulated line lightning stroke breakage comprehensive protection optimizing apparatus, which includes:
the power distribution network simulation model building module is used for obtaining a power distribution network topological structure, and associated equipment parameters and the number of users of the power distribution network topological structure to build a power distribution network simulation model;
the power distribution line simulation system comprises an induction lightning distribution line simulation module, a power distribution network simulation module and a power distribution network simulation module, wherein the induction lightning distribution line simulation module is used for carrying out induction lightning distribution line simulation based on a power distribution network simulation model to obtain the line breakage rate and the number of influencing users of the simulation power distribution line in an unprotected mode and in two protection modes of a lightning conductor and a lightning arrester; the disconnection rate is equal to the product of the total lightning number on the distribution line, the arcing rate and the probability that the lightning current exceeds the critical current of flashover lightning;
the optimal protection calculation module of the distribution line is used for dividing the product of the number of influencing users after the distribution line i is broken and the breakage rate of the j-th protection mode selected by the distribution line i by the total number of users to obtain an average interruption frequency index of the distribution line i in the j-th protection mode selected; constructing a target function according to the minimum value of the average interruption frequency index of the current distribution line, and solving the optimal protection mode of the corresponding distribution line by taking the total cost not exceeding the total investment amount as a constraint condition; wherein i represents any distribution line, and is a positive integer greater than or equal to 1; j is 1,2, 3; j ═ 1 represents an unprotected mode; j is 2 to represent a lightning conductor protection mode; j-3 indicates the lightning arrester protection mode.
A third aspect of the present disclosure provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps in the method for optimizing lightning stroke and disconnection comprehensive protection of a 10kV overhead insulated line as described above.
A fourth aspect of the present disclosure provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the program to implement the steps in the method for optimizing lightning stroke and disconnection comprehensive protection of a 10kV overhead insulated line as described above.
The beneficial effects of this disclosure are:
the method comprises the steps of simulating distribution lines by induction lightning stroke based on a power distribution network simulation model to obtain the line breakage rate and the number of influencing users of the simulated distribution lines in an unprotected mode and in two protection modes, namely a lightning conductor and a lightning arrester, and dividing the product of the number of influencing users after the line breakage of the distribution line i and the line breakage rate of the distribution line i in the jth protection mode by the total number of users to obtain the average interruption frequency index of the distribution line i in the jth protection mode; the method comprises the steps of constructing a target function according to the minimum value of the average interruption frequency index of the current distribution line, taking the total cost not exceeding the total investment amount as a constraint condition, obtaining the optimal protection mode of the corresponding distribution line, simulating the lightning stroke broken line condition of the overhead insulated line by using a simulation technology, obtaining the optimal protection mode, improving the reliability of lightning stroke broken line prevention, and realizing the minimization of the lightning stroke broken line rate of the power distribution network.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a flowchart of a lightning-strike and wire-breaking comprehensive protection optimization method for a 10kV overhead insulated line according to an embodiment of the disclosure.
FIG. 2 shows the current-voltage characteristics of YH5WS3-17/50 type arrester.
Fig. 3 shows the simulation result of lightning protection after a group of lightning arresters are installed at every other pole.
Fig. 4 is a structural schematic diagram of a lightning-strike and wire-breaking comprehensive protection optimization device for a 10kV overhead insulated line in an embodiment of the disclosure.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example 1
As shown in fig. 1, the lightning strike and disconnection comprehensive protection optimization method for a 10kV overhead insulated line in the embodiment includes:
s101: acquiring a power distribution network topological structure, associated equipment parameters and the number of users, and constructing a power distribution network simulation model;
specifically, the power distribution network simulation model comprises an insulator flashover model, an overhead line model, a lightning arrester model and a tower model.
At present, the insulator string flashover criterion for overhead lines in China mainly comprises the following criteria, namely a definition method, an intersection method and a guide method.
In the current industry standard and engineering practice in China, a definition method is usually used as a criterion for judging whether the insulator is in flashover, namely, according to a calculation formula given in a regulation, the actual overvoltage values born at two ends of the insulator string are compared with 50% of the impact discharge voltage of the insulator string, and when the actual overvoltage exceeds the 50% of the impact discharge voltage, the insulator is considered to be in flashover. Therefore, this method is also called 50% discharge voltage method. In this example, a pin insulator of the P-15 type was selected, and the 50% impulse discharge voltage thereof was 117 kV.
At present, overhead line models in ATP-EMTP mainly comprise five models, namely a Bergeron model, a pi-shaped centralized parameter model, a Node model, a J.Marti model and a Semleen model. The J.Marti model has the advantages of wide application range, high calculation precision and the like, and is generally applied to lightning overhead line models. The main types of overhead lines are: LGJ-120, LGJ-70 and LGJ-35, of which LGJ-35 is the most widely used. The LGJ-35 type overhead line is simulated by using a J.Marti model without transposition.
The lightning arrester model of the embodiment adopts a zinc oxide lightning arrester, the lightning protection characteristic benefits from the nonlinear volt-ampere characteristic of the zinc oxide resistor valve block inside the lightning arrester, and the current commonly used zinc oxide lightning arrester model adopts the exponential function described in the formula (1) to describe the nonlinear characteristic of the valve block inside the lightning arrester.
Wherein p and q are fixed values, vrefThe reference voltage of the lightning arrester is 10k V in this embodiment.
In a 10kV distribution line, a YH5WS3-17/50 lightning arrester having a current-voltage characteristic as shown in fig. 2 was used.
The inductance of the reinforced concrete pole without the guy wires is 0.84 mu h/m, and the inductance of the reinforced concrete pole with the guy wires is 0.42 mu h/m. In the ATP-EMTP simulation, a gutless reinforced concrete pole is used, and the pole tower is divided into two parts, wherein the upper part represents the tower top to the cross arm (about 1 meter), and the lower part represents the cross arm to the tower bottom (about 10 meters).
S102: carrying out induction lightning distribution line simulation based on a power distribution network simulation model to obtain the line breakage rate and the number of influencing users of the simulated distribution line in an unprotected mode and in two protection modes, namely a lightning conductor and a lightning arrester; the disconnection rate is equal to the product of the total lightning number on the distribution line, the arcing rate and the probability that the lightning current exceeds the critical current of flashover lightning;
the transient process of the distribution line under the action of lightning shock waves is simulated by establishing an equivalent model of the distribution line, and the transient process is compared with the lightning resistance level of the distribution line after lightning protection measures are taken. Because the induced lightning overvoltage is in direct proportion to the height of the power transmission line, the three-phase heights of the power transmission line are close, and the three-phase overvoltage levels are close, the waveform of one phase can be collected.
Common equivalent models of lightning current in lightning impulse tests and lightning protection designs mainly comprise double-exponential waves, oblique-angle waves and Heilder. The lightning current waveform recommended by IEC 1312-1 is the Heilder model. Considering that the rising speed of the Heilder model is slow, and the falling time is slightly longer and is consistent with the actual measurement result, the embodiment is to adopt the Heilder index model to simulate the lightning impulse waves, and the waveform parameter is set to be 2.6/50.
The magnitude of the induced overvoltage on the line can be estimated by equation (2).
Wherein, U isINIs the maximum value of the induced overvoltage on the line at that location. I is0The peak value of the lightning current (kA), h is the height (m) of the conductor pair to the ground, and y is the horizontal distance from a lightning stroke point to a tower. c is the speed of light and v is the propagation velocity of the return shock, typically c/3. The embodiment realizes the calculation of the induction thunder through a model in ATP/EMTP.
And carrying out simulation calculation on the lightning protection effect after a group of lightning arresters are installed at every other rod. The simulation results are shown in fig. 3.
Through simulation, when a group of lightning arresters are installed at every 1-level pole tower, the pole tower without the lightning arresters cannot be effectively protected. For insulators there is still a greater chance of flashover. The flashover rate of a group of arresters installed every 1-level pole tower is 0.7554, which is reduced but is only 7.2% compared with the flashover rate of the arresters not installed. The results demonstrate that the lightning arrester has very little protection to the adjacent pole. Therefore, the lightning arrester can only be continuously installed at the easy-to-strike section to play a good role.
TABLE 1 lightning arrester installation density and flashover rate
Compared with a distribution line without an overhead ground wire, the overvoltage amplitude at two ends of the insulator is effectively reduced due to the coupling effect between the overhead ground wire and the wire, and the occurrence of line lightning stroke breakage accidents is reduced.
In order to illustrate the interdependence between lightning and distribution system reliability, the system response characteristic under the lightning condition needs to be established in mathematical modeling. For a given lightning protection system, it is necessary to calculate its lightning withstand level, i.e. the lightning critical current I at which a flashover occurs0。
When the induced lightning overvoltage of the overhead distribution line is calculated when the ground near the lightning strike line is in the ground, in order to make the calculation basically reflect the value of the induced lightning overvoltage, the following assumptions are made:
1) only the induced voltage formed by the electrostatic effect and the magnetic effect generated in the main discharge back-strike process is considered;
2) the charge distribution along the pilot channel is uniform, and the lightning stroke is vertical to the ground;
3) the main discharge speed (lightning strike-back speed) v is constant and has a certain proportional relation with the light speed c;
4) the overhead line is an ideal conductor and has no loss.
Lightning current exceeding I0The probability of (c) is calculated as follows:
i0Is the expected lightning peak current (kA).
The lightning strike of the distribution line causes the insulator to impact and flashover, but not all the lightning strike causes the disconnection. The duration of the impulse flashover is only dozens of microseconds, so that the line is broken, the impulse arc must be converted into a stable power frequency arc, and the heat resistance of the overhead insulated line is general, so that the line is melted and finally broken due to the heat of the arc. According to experiments and operation experiences, the probability of the impact flashover being converted into the stable power frequency arc is called the arc establishment rate. In a 10kV power distribution network, the arc rate is determined by the lightning resistance level of an overhead insulated line and the voltage gradient of an insulator.
Determining lightning parameters according to the position of the actually-operated 10kV power distribution network, and combining with the lightning resistance level, wherein the lightning current exceeds I0Deducing the lightning stroke breakage rate n of the 10kV overhead insulated line according to the probability and arc establishment rate eta parameters:
wherein N is the total number of landmines on the distribution line.
According to the line breakage rate mathematical model, a line breakage mechanism is disclosed, and key factors influencing the line breakage rate are given.
This embodiment provides three kinds of thunderbolt protection modes to distribution lines altogether, and is unprotected promptly, the protection of lightning conductor, the protection of arrester. Since the lightning stroke disconnection rate of the distribution line is 96.8%, the present embodiment calculates the disconnection rate according to the most serious condition, that is, the trip rate is equal to the disconnection rate. The lightning resistance and the disconnection rate of the line in the three modes of the embodiment are shown in table 2.
TABLE 2 statistics of line break rate under three modes
| Means for | Lightning resistance level | Rate of wire breakage |
| Without protection | 17.8 | 2.5241 |
| Lightning conductor | 26.5 | 1.8970 |
| Lightning arrester | >200 | 0 |
From the above data, it can be seen that the safety of the line is extremely high when the lightning arrester is continuously installed, but the economic cost of continuously installing the lightning arrester in the power distribution network is large, so the protection mode should be selectively installed for some lines. The protection mode of the line should be selected according to a certain principle, so that the power supply reliability of a system user is improved as much as possible under the condition of meeting the economic requirement, and instantaneous interruption and permanent interruption are avoided.
S103: dividing the product of the number of influencing users after the distribution line i is disconnected and the disconnection rate of the distribution line i in the jth protection mode selected by the total number of users to obtain an average interruption frequency index of the distribution line i in the jth protection mode selected by the jth user; constructing a target function according to the minimum value of the average interruption frequency index of the current distribution line, and solving the optimal protection mode of the corresponding distribution line by taking the total cost not exceeding the total investment amount as a constraint condition; wherein i represents any distribution line, and is a positive integer greater than or equal to 1; j is 1,2, 3; j ═ 1 represents an unprotected mode; j is 2 to represent a lightning conductor protection mode; j-3 indicates the lightning arrester protection mode.
In the actual lightning protection reconstruction project, the electric power department usually hopes to reduce the construction cost as much as possible on the premise of ensuring that the line has good lightning resistance so as to obtain a lower input-output ratio. It is known from market research that the GJ-35 type line is available at a price of about 8000 yuan/ton, and thus, for distribution lines, it usually takes 4000 yuan per 1km line installed. The YH5WX17/50 type zinc oxide lightning arrester has a market sale price of about 560 yuan/group, and the lightning arrester installation schemes are respectively adopted, so that when the zinc oxide lightning arrester is installed on each stage of tower, 9520 yuan/km is required. In addition, a good grounding system is required when installing the arrester. Therefore, when the lightning arrester is installed, the ground system is more expensive than when the lightning conductor is installed. This also results in a large economic investment gap between the two.
The System Average Interrupt Frequency Index (SAIFI) indicates that the average customer's frequency experiences sustained interrupts for a predetermined period of time. The index has a direct relationship with the permanent failure of the system.
Wherein, SAIFIijRepresenting the average interruption frequency index of the distribution line i in the j protection mode; b isiRepresenting the number of the users influenced by the broken line of the line i; 1.2.3 …, 1.2.3 j; j represents the corresponding protection mode. No protection (j ═ 1); a lightning conductor (j ═ 2); a lightning arrester (j ═ 3); b isTRepresenting the total number of users; n isijRepresenting the line break rate.
m in SA IFI＝SA IFIijxij
Wherein x isijWhen the value of (1) is only 0 or 1, the protection of the ith line in a j mode is selected;
cost represents expense, invent represents investment, 3 protection modes are provided, only one of the 81 lines can be adopted, and 1 is added to serve as a constraint condition.
In this embodiment, during the process of simulating the distribution line by inductive lightning, a Heilder index model is used to simulate the lightning shock wave.
Specifically, compared with the conventional Genetic Algorithm (GA), the particle swarm optimization algorithm is simple and easy to implement, and has no need of adjusting many parameters, so that the particle swarm optimization algorithm is widely applied to the fields of neural networks, pattern classification, function optimization and the like. However, the particle swarm optimization is apt to fall into a local optimal solution and stop when a complex problem is handled, i.e., a so-called premature convergence phenomenon. The embodiment utilizes a particle swarm optimization algorithm with genetic selection operators, crossover operators and mutation operators to obtain the optimal protection mode of the corresponding distribution line; wherein, the genetic selection operator is used for directly inheriting the optimized individuals to the next generation or generating new individuals through pairing and crossing and then inheriting the new individuals to the next generation; when the cross operator approaches the neighborhood of the optimal solution, the convergence to the optimal solution is accelerated through the local random search capability of the mutation operator.
The Particle Swarm Optimization (PSO) algorithm is an iterative-based Optimization tool, in which particles follow the optimal particles in a solution space to search, and the optimal value is searched through continuous iteration. The particle swarm algorithm has the main advantages that the capability of searching a better solution is stronger, and the optimization speed is higher; meanwhile, the optimal solution based on particle swarm optimization algorithm model correction can be calculated more quickly and accurately.
The PSO algorithm randomly gives a group of particles at first, and then new particle swarms iterated out search the nearby range until the optimal particle swarms of a solution space are reached, namely the optimal solution is reached through continuous iteration. Assuming that in an N-dimensional search space, the position and velocity of the particle population are Xi ═ respectively (Xi1, Xi2, Xi 3.. xin) and Vi ═ respectively (Vi1, Vi2, Vi 3.. vin), the particle replaces itself according to two optimal solutions during each iteration: one is the optimal solution around the particle itself, i.e. the superior solution pbest in the individual; the other is that the whole population compares the found optimal solution before (including) this iteration, i.e. the optimal solution gbest in the global. The process of each iteration updates the velocity V and position X according to equations 5 and 6.
In the formula (I), the compound is shown in the specification,
is the speed of the nth dimension in the kth iteration of the particle;
is the current position of the particle i in the nth dimension in the kth iteration; pbestin is the position of particle i at the n-dimension individual extreme point; gbestin is the position of the whole population at the nth dimension global extreme point; r1 and r2 are [0, 1 ]]A random number of (c); c1, c2 are learning factors.
The particle swarm optimization algorithm is significantly influenced by control parameters such as particle number, maximum speed, learning factors and inertia weight. Generally, good results can be obtained by selecting about 40 particles, and 100 particles can be selected for more complicated problems; the optimization problem determines the range of the particles, and each latitude can be set to be different; the learning factor gives the particles the ability to self-summarize and learn from excellent individuals in the population, approaching the intra-population or intra-neighborhood optima, typically c1 ═ c2, ranging from 0 to 4; the inertia weight determines the inheritance of the particle to the current speed, and the proper selection of the inertia weight can enable the particle to have balanced exploration capacity and development capacity.
The particle swarm optimization algorithm is a process for simulating bird predation. In the optimization process, a defined group of particles is a group of birds, each particle is defined with its own position quantity and speed quantity, an n-dimensional vector is used for representing the speed values of different particles, the same speed is a vector similar to a vector with the same latitude, and the position is a solution in the optimization problem.
In the mutation, the heterology operation simulates the process of gene mutation in biological evolution, and a certain gene on a gene sequence is mutated into a gene. The main functions are two: one is to make the genetic algorithm have local random search capability. When the genetic algorithm approaches the optimal solution neighborhood through the crossover operator, the convergence to the optimal solution can be accelerated through the local random search capability of the mutation operator. Secondly, the genetic algorithm can maintain the diversity of the population so as to prevent the premature convergence phenomenon.
The embodiment carries out induction lightning distribution line simulation based on a power distribution network simulation model to obtain the disconnection rate and the number of influencing users of a simulation power distribution line in an unprotected mode and in two protection modes, namely a lightning conductor and a lightning arrester, and the average interruption frequency index of the power distribution line in the protection mode j selected by the power distribution line i is obtained by dividing the product of the number of influencing users after the disconnection of the power distribution line i and the disconnection rate of the power distribution line i in the protection mode j selected by the power distribution line i by the total number of users; the method comprises the steps of constructing a target function according to the minimum value of the average interruption frequency index of the current distribution line, taking the total cost not exceeding the total investment amount as a constraint condition, obtaining the optimal protection mode of the corresponding distribution line, simulating the lightning stroke broken line condition of the overhead insulated line by using a simulation technology, obtaining the optimal protection mode, improving the reliability of lightning stroke broken line prevention, and realizing the minimization of the lightning stroke broken line rate of the power distribution network.
Example 2
As shown in fig. 4, this embodiment provides a 10kV overhead insulated line lightning stroke disconnection comprehensive protection optimizing apparatus, which includes:
(1) the power distribution network simulation model building module is used for obtaining a power distribution network topological structure, and associated equipment parameters and the number of users of the power distribution network topological structure to build a power distribution network simulation model;
the power distribution network simulation model comprises an insulator flashover model, an overhead line model, a lightning arrester model and a tower model.
(2) The power distribution line simulation system comprises an induction lightning distribution line simulation module, a power distribution network simulation module and a power distribution network simulation module, wherein the induction lightning distribution line simulation module is used for carrying out induction lightning distribution line simulation based on a power distribution network simulation model to obtain the line breakage rate and the number of influencing users of the simulation power distribution line in an unprotected mode and in two protection modes of a lightning conductor and a lightning arrester; the disconnection rate is equal to the product of the total lightning number on the distribution line, the arcing rate and the probability that the lightning current exceeds the critical current of flashover lightning;
and in the induced lightning distribution line simulation module, simulating lightning shock waves by adopting a Heilder index model.
(3) The optimal protection calculation module of the distribution line is used for dividing the product of the number of influencing users after the distribution line i is broken and the breakage rate of the j-th protection mode selected by the distribution line i by the total number of users to obtain an average interruption frequency index of the distribution line i in the j-th protection mode selected; constructing a target function according to the minimum value of the average interruption frequency index of the current distribution line, and solving the optimal protection mode of the corresponding distribution line by taking the total cost not exceeding the total investment amount as a constraint condition; wherein i represents any distribution line, and is a positive integer greater than or equal to 1; j is 1,2, 3; j ═ 1 represents an unprotected mode; j is 2 to represent a lightning conductor protection mode; j-3 indicates the lightning arrester protection mode.
In the optimal protection solving module of the distribution line, the optimal protection mode of the corresponding distribution line is solved by utilizing a particle swarm optimization algorithm added with a genetic selection operator, a crossover operator and a mutation operator; wherein, the genetic selection operator is used for directly inheriting the optimized individuals to the next generation or generating new individuals through pairing and crossing and then inheriting the new individuals to the next generation; when the cross operator approaches the neighborhood of the optimal solution, the convergence to the optimal solution is accelerated through the local random search capability of the mutation operator.
The embodiment carries out induction lightning distribution line simulation based on a power distribution network simulation model to obtain the disconnection rate and the number of influencing users of a simulation power distribution line in an unprotected mode and in two protection modes, namely a lightning conductor and a lightning arrester, and the average interruption frequency index of the power distribution line in the protection mode j selected by the power distribution line i is obtained by dividing the product of the number of influencing users after the disconnection of the power distribution line i and the disconnection rate of the power distribution line i in the protection mode j selected by the power distribution line i by the total number of users; the method comprises the steps of constructing a target function according to the minimum value of the average interruption frequency index of the current distribution line, taking the total cost not exceeding the total investment amount as a constraint condition, obtaining the optimal protection mode of the corresponding distribution line, simulating the lightning stroke broken line condition of the overhead insulated line by using a simulation technology, obtaining the optimal protection mode, improving the reliability of lightning stroke broken line prevention, and realizing the minimization of the lightning stroke broken line rate of the power distribution network.
Example 3
The present embodiment provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps in the method for optimizing lightning strike and breakage comprehensive protection of a 10kV overhead insulated line, as shown in fig. 1.
Example 4
The embodiment provides a computer device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the steps in the method for optimizing the lightning stroke and breakage comprehensive protection of the 10kV overhead insulated line shown in fig. 1.
The embodiment carries out induction lightning distribution line simulation based on a power distribution network simulation model to obtain the disconnection rate and the number of influencing users of a simulation power distribution line in an unprotected mode and in two protection modes, namely a lightning conductor and a lightning arrester, and the average interruption frequency index of the power distribution line in the protection mode j selected by the power distribution line i is obtained by dividing the product of the number of influencing users after the disconnection of the power distribution line i and the disconnection rate of the power distribution line i in the protection mode j selected by the power distribution line i by the total number of users; the method comprises the steps of constructing a target function according to the minimum value of the average interruption frequency index of the current distribution line, taking the total cost not exceeding the total investment amount as a constraint condition, obtaining the optimal protection mode of the corresponding distribution line, simulating the lightning stroke broken line condition of the overhead insulated line by using a simulation technology, obtaining the optimal protection mode, improving the reliability of lightning stroke broken line prevention, and realizing the minimization of the lightning stroke broken line rate of the power distribution network.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. A lightning stroke broken line comprehensive protection optimization method for a 10kV overhead insulated line is characterized by comprising the following steps:
acquiring a power distribution network topological structure, associated equipment parameters and the number of users, and constructing a power distribution network simulation model;
carrying out induction lightning distribution line simulation based on a power distribution network simulation model to obtain the line breakage rate and the number of influencing users of the simulated distribution line in an unprotected mode and in three protection modes of a lightning conductor and a lightning arrester; the disconnection rate is equal to the product of the total lightning number on the distribution line, the arcing rate and the probability that the lightning current exceeds the critical current of flashover lightning;
dividing the product of the number of influencing users after the distribution line i is disconnected and the disconnection rate of the distribution line i in the jth protection mode selected by the total number of users to obtain an average interruption frequency index of the distribution line i in the jth protection mode selected by the jth user; constructing a target function according to the minimum value of the average interruption frequency index of the current distribution line, and solving the optimal protection mode of the corresponding distribution line by taking the total cost not exceeding the total investment amount as a constraint condition; wherein i represents any distribution line, and is a positive integer greater than or equal to 1; j is 1,2, 3; j ═ 1 represents an unprotected mode; j is 2 to represent a lightning conductor protection mode; j-3 indicates the lightning arrester protection mode.
2. The lightning stroke and disconnection comprehensive protection and optimization method for the 10kV overhead insulated line according to claim 1, wherein the power distribution network simulation model comprises an insulator flashover model, an overhead line model, a lightning arrester model and a tower model.
3. The lightning stroke broken line comprehensive protection and optimization method for the 10kV overhead insulated line according to claim 1, wherein in the process of simulating the distribution line by induction lightning stroke, a Heilder index model is adopted to simulate lightning shock waves.
4. The lightning stroke broken line comprehensive protection optimization method for the 10kV overhead insulated line according to claim 1, wherein the optimal protection mode of the corresponding distribution line is obtained by utilizing a particle swarm optimization algorithm with genetic selection operators, crossover operators and mutation operators; wherein, the genetic selection operator is used for directly inheriting the optimized individuals to the next generation or generating new individuals through pairing and crossing and then inheriting the new individuals to the next generation; when the cross operator approaches the neighborhood of the optimal solution, the convergence to the optimal solution is accelerated through the local random search capability of the mutation operator.
5. The utility model provides a 10kV overhead insulated line thunderbolt broken string comprehensive protection optimizing apparatus which characterized in that includes:
the power distribution network simulation model building module is used for obtaining a power distribution network topological structure, and associated equipment parameters and the number of users of the power distribution network topological structure to build a power distribution network simulation model;
the power distribution line simulation system comprises an induction lightning distribution line simulation module, a power distribution network simulation module and a power distribution network simulation module, wherein the induction lightning distribution line simulation module is used for carrying out induction lightning distribution line simulation based on a power distribution network simulation model to obtain the line breakage rate and the number of influencing users of the simulation power distribution line in an unprotected mode and in three protection modes of a lightning conductor and a lightning arrester; the disconnection rate is equal to the product of the total lightning number on the distribution line, the arcing rate and the probability that the lightning current exceeds the critical current of flashover lightning;
the optimal protection calculation module of the distribution line is used for dividing the product of the number of influencing users after the distribution line i is broken and the breakage rate of the j-th protection mode selected by the distribution line i by the total number of users to obtain an average interruption frequency index of the distribution line i in the j-th protection mode selected; constructing a target function according to the minimum value of the average interruption frequency index of the current distribution line, and solving the optimal protection mode of the corresponding distribution line by taking the total cost not exceeding the total investment amount as a constraint condition; wherein i represents any distribution line, and is a positive integer greater than or equal to 1; j is 1,2, 3; j ═ 1 represents an unprotected mode; j is 2 to represent a lightning conductor protection mode; j-3 indicates the lightning arrester protection mode.
6. The 10kV overhead insulated line lightning stroke disconnection comprehensive protection optimization device of claim 5, wherein the power distribution network simulation model comprises an insulator flashover model, an overhead line model, a lightning arrester model and a tower model.
7. The 10kV overhead insulated line lightning breakage comprehensive protection optimization device of claim 5, wherein in the induced lightning distribution line simulation module, a Heilder index model is adopted to simulate lightning shock waves.
8. The 10kV overhead insulated line lightning stroke disconnection comprehensive protection optimization device of claim 5, wherein in the distribution line optimal protection obtaining module, a particle swarm optimization algorithm with a genetic selection operator, a crossover operator and a mutation operator is used for obtaining the optimal protection mode of the corresponding distribution line; wherein, the genetic selection operator is used for directly inheriting the optimized individuals to the next generation or generating new individuals through pairing and crossing and then inheriting the new individuals to the next generation; when the cross operator approaches the neighborhood of the optimal solution, the convergence to the optimal solution is accelerated through the local random search capability of the mutation operator.
9. A computer-readable storage medium, on which a computer program is stored, wherein the program, when executed by a processor, implements the steps in the method for optimizing lightning protection against broken wire of 10kV overhead insulated line according to any one of claims 1 to 4.
10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps in the method for optimizing lightning stroke and breakage protection of 10kV overhead insulated line according to any one of claims 1 to 4.
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