CN113536721B - System and method for calculating lightning resistance level difference of power transmission line - Google Patents
System and method for calculating lightning resistance level difference of power transmission line Download PDFInfo
- Publication number
- CN113536721B CN113536721B CN202110701422.1A CN202110701422A CN113536721B CN 113536721 B CN113536721 B CN 113536721B CN 202110701422 A CN202110701422 A CN 202110701422A CN 113536721 B CN113536721 B CN 113536721B
- Authority
- CN
- China
- Prior art keywords
- module
- lightning
- calculation
- transmission line
- power transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
-
- 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
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Wind Motors (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to a power transmission line lightning resistance level differentiation calculation system and method, and belongs to the technical field of power transmission line lightning protection performance calculation analysis. The system comprises a data acquisition module, a basic database module, a model generation module, an electromagnetic transient calculation module, an insulator flashover judgment module, a gap breakdown judgment module, an counterattack trip-out rate calculation module, a shielding failure trip-out rate calculation module, a comprehensive trip-out rate calculation module and the like.
Description
Technical Field
The invention belongs to the technical field of lightning protection performance calculation of power transmission lines, and particularly relates to a system and a method for calculating lightning protection level difference of a power transmission line.
Background
Lightning strikes are a significant cause of tripping in power transmission lines. For high voltage transmission lines, especially for extra high voltage lines, lightning strikes are the main cause of line tripping. The improvement of the lightning protection performance of the power transmission line has very important significance on the safe and stable operation of the system.
At present, for the lightning stroke problem of a high-voltage transmission line, corresponding measures and methods are provided in theoretical research and engineering practice, such as reducing a ground wire protection angle, reducing ground resistance, increasing insulation strength, using a line arrester and the like. Although a great deal of research is carried out on lightning protection measures and methods of the power transmission line by various power operation and research organizations for many years, the lightning protection performance evaluation method is mainly based on experience and semi-experience formulas, no calculation software for carrying out lightning protection evaluation on the power transmission line by adopting an advanced method is available, the effect of each measure can be comprehensively analyzed and compared, a uniform guidance scheme aiming at the lightning protection work of the ultrahigh voltage line is not formed, and clear and effective counter measures are lacked for lightning accidents of different types of lines. Therefore, the guiding of the lightning protection work is not strong, and great difficulty is brought to the decision of lightning protection measures. Therefore, the application range and the transformation effect of various lightning protection measures are comprehensively evaluated, a reference basis is provided for the development of line lightning protection work, and the method has important significance for reducing lightning accidents, improving the availability of lines and ensuring the safe and stable operation of a main network frame.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and provides a power transmission line lightning protection level differential calculation method to realize the differential evaluation of the lightning protection performance of the power transmission line, so that the calculation accuracy is improved, and the economic performance of lightning protection technical improvement is greatly improved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a power transmission line lightning resistance level differentiation calculation system comprises:
the data acquisition module is used for acquiring parameter data of the power transmission line to be calculated;
the basic database module is used for storing various types of tower model templates, insulator model templates, lead model templates and lightning leading model templates;
the model generation module is respectively connected with the data acquisition module and the basic database module and used for calling corresponding model templates in the basic database module according to the data acquired by the data acquisition module and generating a model diagram of the power transmission line to be calculated;
the electromagnetic transient calculation module is respectively connected with the data acquisition module and the model generation module and is used for performing electromagnetic transient calculation according to the data acquired by the data acquisition module and the model diagram of the power transmission line to be evaluated, which is generated by the model generation module;
the insulator flashover judgment module is connected with the electromagnetic transient calculation module and is used for judging whether insulator flashover occurs or not according to the calculation result of the electromagnetic transient calculation module;
the gap breakdown judging module is connected with the electromagnetic transient calculating module and is used for judging whether gap breakdown occurs according to the calculation result of the electromagnetic transient calculating module;
the counterattack tripping rate calculation module is connected with the insulator flashover judgment module and is used for calculating the counterattack tripping rate when the insulator flashover judgment module judges that the insulator flashover can occur;
the shielding failure trip rate calculation module is connected with the gap breakdown judgment module and is used for calculating the shielding failure trip rate when the gap breakdown judgment module judges that the gap breakdown can occur;
the comprehensive trip rate calculation module is respectively connected with the counterattack trip rate calculation module and the shielding failure trip rate calculation module and is used for calculating the comprehensive trip rate through a weighting method according to the calculation results of the counterattack trip rate calculation module and the shielding failure trip rate calculation module;
and the lightning protection performance improvement suggestion module is connected with the comprehensive trip rate calculation module and used for providing a corresponding lightning protection performance improvement suggestion scheme according to the calculated comprehensive trip rate.
Further, preferably, the data acquisition module is used for acquiring the voltage type, the voltage grade, tower parameters, conductor structure parameters, sub-conductor parameters, the geographic terrain, tower ground resistance, lightning current waveform, lightning current density and lightning daily parameters of the power transmission line to be evaluated.
Further, preferably, the model diagram of the power transmission line to be evaluated generated by the model generation module includes a tower model, a wire structure model, a lightning lead model and an insulator model.
Further, preferably, the comprehensive trip rate calculation module calculates the comprehensive trip rate by a weighting method according to the calculation results of the counterattack trip rate calculation module and the shielding trip rate calculation module; the method comprises the steps of firstly counting the proportion of different tower types in different terrains in the whole line to obtain the proportion of different tower types in various terrains, then multiplying the proportion by the counterattack trip rate and the shielding attack trip rate of the corresponding tower type, and then adding all the calculation results to obtain the comprehensive trip rate of the line.
Further, preferably, the suggested scheme for improving the lightning protection performance comprises tower grounding resistance optimization and/or protection angle optimization.
Further, preferably, the lightning protection device further comprises a display module, which is respectively connected with the data acquisition module, the model generation module, the electromagnetic transient calculation module, the insulator flashover judgment module, the gap breakdown judgment module, the comprehensive trip rate calculation module and the lightning protection performance improvement suggestion module, and is used for displaying the acquired parameter data, the generated model diagram, the electromagnetic transient calculation result, the insulator flashover judgment result, the gap breakdown judgment result, the comprehensive trip rate calculation result and the lightning protection performance improvement suggestion scheme.
Further, preferably, the insulator breakdown judging device further comprises an input control module which is respectively connected with the data acquisition module, the insulator flashover judging module and the gap breakdown judging module and is used for processing and acquiring insulator criterion data and breakdown gap criterion data.
The invention also provides a lightning resistance level difference calculation method for the power transmission line, which adopts the lightning resistance level difference calculation system for the power transmission line and comprises the following steps:
step (1), collecting parameter data of a power transmission line to be calculated;
step (2), according to the data collected in the step (1), calling a corresponding model template in a basic database module to generate a model diagram of the power transmission line to be calculated;
step (3), performing electromagnetic transient calculation according to the data acquired in the step (1) and the model diagram of the power transmission line to be evaluated generated in the step (2);
step (4), judging whether insulator flashover occurs or not according to the calculation result of the step (3); if yes, calculating the counterattack trip rate; if not, the counterattack trip rate is not calculated;
step (5), judging whether gap breakdown occurs according to the calculation result of the step (3); if yes, calculating the shielding failure trip rate; if not, the shielding failure trip rate is not calculated;
step (6), calculating the comprehensive trip rate by a weighting method according to the counterattack trip rate and the shielding attack trip rate obtained in the step (4) and the step (5);
and (7) calculating the obtained comprehensive trip rate to provide a corresponding lightning protection performance improvement proposal.
Further, it is preferable that the method further comprises: and according to the calculation result of the trip-out rate of each base tower in the whole line and a high-to-low arrangement method, providing a tower list which obviously influences the comprehensive trip-out rate of the whole line and suggests preferential reconstruction. Through the differential transformation mode, the construction cost is greatly reduced, and the economical efficiency of the transformation scheme is improved.
Further, it is preferable that the method further comprises: predicting and calculating the transformation effect in the lightning protection performance transformation proposal; the improvement effect comprises that when the grounding resistance or the protection angle of a given tower respectively reaches a certain reachable value, the lightning trip-out rate prediction result of the base tower is calculated.
The flashover criterion of the insulator flashover judging module in the invention generally uses 50% discharge voltage of an insulator string and volt-second characteristic of the insulator string to judge the flashover condition of the insulator. The 50% lightning impulse discharge voltage and volt-second characteristics are obtained by a standard lightning wave (1.2/50 mus) test, accurately reflect the impulse insulation characteristics of an insulator string under the action of the standard lightning wave, and are the basis for establishing an insulator flashover criterion. The approximately linear relation between the flashover voltage at each moment and the number of insulator pieces on the insulator volt-second characteristic curve and the relation between the flashover voltage at each moment and the number of insulator pieces are obtained through research, so that the volt-second characteristic and 50% impact discharge voltage under standard waves of insulator strings with different lengths can be obtained, and a data basis is provided for flashover calculation of line insulators with different voltage grades. The flashover voltage of the insulator string at the flashover time t can be calculated by the following formula:
U(t)＝kn+b
wherein k and b are fitting coefficients, n is the number of insulator pieces, and U (t) is a standard wave flashover voltage amplitude (unit: MV) with flashover time t.
Through theoretical research, the results of k and b after fitting are obtained through a large number of experiments and simulation calculations and are shown in the following tables 1 and 2.
TABLE 1 relationship coefficient between positive polarity flashover voltage and number of insulator pieces
TABLE 2 relationship coefficient of the negative polarity flashover voltage and the number of insulator pieces
The basis for judging the insulation flashover is mainly a definition method and a leader length method. The definition method mainly utilizes the peak value of the voltage borne by the insulator to judge whether the insulation flashover occurs. When the bearing voltage peak value is larger than 50% of the discharge voltage value of the insulator, the insulation flashover time can be judged according to the insulation discharge time delay. The pilot length method is to calculate the occurrence of pilot discharge in the air gap by using the physical mechanism of air discharge, and when the pilot length in the gap reaches the gap length, the insulation flashover occurs.
The method for determining the gap breakdown judgment module criterion comprises the following steps: with the relative development of the uplink and downlink pilots, the distance between the uplink and downlink pilots is gradually shortened, and the gap field intensity is gradually increased. When a certain condition is satisfied between the two, breakdown occurs. In the invention, the critical breakdown field intensity between a lightning pilot and a head-on pilot or a ground object (a ground wire and a tower) is 500kV/m; considering that the lightning guiding capacity of the ground is poor, the critical breakdown field strength between the lightning guide and the ground is 750kV/m.
In the weighting calculation of the comprehensive trip rate calculation, the proportion of different tower types in different terrains in the whole line is counted to obtain the proportion of different tower types in various terrains, the proportion is multiplied by the counterattack/shielding attack trip rate of the corresponding tower type, and all calculation results are added to obtain the comprehensive trip rate of the line. And comparing with the trip rate limit value specified by the national standard to sequentially judge whether the trip rate of the line meets the requirement.
TABLE 3 lightning trip-out rate limit for each voltage class line (reduced to 40 thunderstorm days)
| Voltage class (KV) | Trip rate (second/hundred kilometers, year) |
| 110(66) | 0.525 |
| 220 | 0.315 |
| 330 | 0.2 |
| 500 | 0.14 |
When the lightning trip-out rate of a given line exceeds a limit value, the line needs to be subjected to lightning protection reconstruction. The general principle of lightning protection improvement is that the reduction of tower ground resistance is given priority to consideration, and in addition, measures such as increasing the length of an insulator string, additionally installing a lightning arrester, improving a protection angle and the like can be taken into consideration for a part of towers with high trip-out rate.
TABLE 4 lightning trip-out rate reference limit value of typical pole tower of overhead transmission line of 110kV to 500kV
Compared with the prior art, the invention has the beneficial effects that:
by the method and the device, the lightning protection performance can be evaluated in a differentiated mode according to the power transmission lines with different voltage types and levels, different terrains, different tower structures, different lead structures and different insulation strengths. Furthermore, lightning protection skill improvement expert suggestions are provided according to different lightning stroke trip-out rates by designing a lightning protection performance improvement suggestion module.
Compared with the existing lightning trip-out rate calculation and evaluation method, the method mainly breaks through in the following two directions:
on one hand, the existing lightning strike counterattack and shielding failure calculation method mainly uses an empirical formula (such as a rule method) or a geometric method to plan a lightning strike process (such as an electrical geometric method) and determines the strike distance according to the lightning strike process, but not according to the development rule of the lightning strike process or directly referring to an insulator U given by an equipment manufacturer 50 Parameters (such as volt-second characteristics) obtained by tests performed by manufacturers according to the test conditions given by the relevant performance standards, wherein the tests only reflect part of the characteristics of the lightning current waveform although meeting the existing performance standards.
The method for calculating the counterattack and shielding failure trip rates adopts a pilot development method, algorithm research is carried out on the basis of an objective process of lightning development, and the method is essentially different from an empirical formula and artificially conceived calculation conditions, so that the theoretical basis of the algorithm is more scientific, and compared with the calculation results of the algorithms, the accuracy is improved by 35% or even higher.
On the other hand, the evaluation and calculation of the lightning trip-out rate of the existing transmission line are mostly calculation results aiming at the whole line, and the guidance significance of the calculation results on the improvement of the lightning protection performance of the line is not great, in the practical production process, although the lightning trip-out rate calculation results of the whole line meet the national standard limit value requirements, in the actual operation of the actual transmission line, the trip-out rate of part of the transmission line is far higher than the national standard limit value. The reason is that the lightning trip-out rate of the whole line is calculated by adopting a single parameter value on key parameter values at present, and the lightning stroke tolerance performance of different tower types and the lightning stroke tolerance capacity of the same tower type under different terrain environments are not considered. Meanwhile, a single value is given to the grounding resistance values of all the towers when the lightning stroke trip-out rate of the whole line is calculated, and the single value is far from the actual situation. Thus resulting in a certain number of pylons throughout the line.
The differential calculation method adopted by the invention is used for independently calculating the lightning trip-out rate of each base tower in the line, thereby realizing the differential calculation of the lightning trip-out rate of the transmission line, enabling the easily-hit towers in the whole line to be clear at a glance, aiming at the lightning protection reconstruction scheme made on the basis of the differential calculation method, avoiding the blind reconstruction of the whole line and greatly reducing the reconstruction cost. Meanwhile, through the calculation of the comprehensive lightning trip-out rate of the whole line, the lightning trip-out rate is calculated and evaluated from two dimensions of a step-by-step tower and the whole line, and scientific and powerful guarantee is provided for the safe operation of electric power.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of a lightning strike-resistant level differentiation calculation system for a power transmission line according to the invention
FIG. 2 is a schematic structural diagram of a lightning strike-resistant level differentiation calculation system of a power transmission line according to another embodiment of the present invention
FIG. 3 is a schematic structural diagram of a lightning strike-resistant level differentiation calculation system of a power transmission line according to still another embodiment of the present invention
101, a data acquisition module; 102. a base database module; 103. a model generation module; 104. an electromagnetic transient calculation module; 105. an insulator flashover judgment module; 106. a gap breakdown judgment module; 107. a counterattack trip rate calculation module; 108. a shielding failure trip rate calculation module; 109. a comprehensive trip rate calculation module; 110. a lightning protection performance improvement suggestion module; 111. a display module; 112. and inputting the control module.
FIG. 4 is a flow chart of the method for calculating the lightning withstand level differentiation of the power transmission line according to the present invention;
FIG. 5 is a schematic diagram of a counterattack calculation model framework;
FIG. 6 is a schematic view of a counterattack computing tower model;
FIG. 7 is a schematic diagram of a model for calculating insulator flashover voltage for counterattack;
FIG. 8 is a schematic diagram of a pilot development model for calculating shielding failure;
FIG. 9 is a schematic view of a tower simulation model for calculating a shielding failure;
fig. 10 is a schematic diagram of a basic terrain model for calculating a shielding failure.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, and all are conventional products available by purchase.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, "connected" as used herein may include wirelessly connected. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, "a plurality" means two or more unless otherwise specified. The terms "inner," "upper," "lower," and the like, refer to an orientation or a state relationship based on that shown in the drawings only for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "provided" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention are understood according to specific situations.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As shown in fig. 1, a power transmission line lightning withstand level differentiation calculation system includes:
the data acquisition module 101 is used for acquiring parameter data of the power transmission line to be evaluated;
the basic database module 102 is used for storing various types of tower model templates, insulator model templates, lead model templates and lightning leading model templates;
the model generation module 103 is respectively connected with the data acquisition module 101 and the basic database module 102, and is used for calling corresponding model templates in the basic database module 102 according to the data acquired by the data acquisition module 101 to generate a model diagram of the power transmission line to be evaluated;
the electromagnetic transient calculation module 104 is respectively connected with the data acquisition module 101 and the model generation module 103, and is used for performing electromagnetic transient calculation according to the data acquired by the data acquisition module 101 and the model diagram of the power transmission line to be evaluated generated by the model generation module 103;
the insulator flashover judging module 105 is connected with the electromagnetic transient calculating module 104 and is used for judging whether insulator flashover occurs according to the calculation result of the electromagnetic transient calculating module 104;
a gap breakdown determination module 106, connected to the electromagnetic transient calculation module 104, for determining whether a gap breakdown will occur according to a calculation result of the electromagnetic transient calculation module 104;
the counterattack trip rate calculation module 107 is connected with the insulator flashover judgment module 105 and is used for calculating counterattack trip rate when the insulator flashover judgment module 105 judges that insulator flashover can occur;
the shielding failure trip rate calculation module 108 is connected with the gap breakdown judgment module 106 and is used for calculating the shielding failure trip rate when the gap breakdown judgment module 106 judges that the gap breakdown occurs;
the comprehensive trip rate calculation module 109 is respectively connected with the counterattack trip rate calculation module 107 and the shielding failure trip rate calculation module 108 and is used for calculating the comprehensive trip rate through a weighting method according to the calculation results of the counterattack trip rate calculation module 107 and the shielding failure trip rate calculation module 108;
and the lightning protection performance improvement suggestion module 110 is connected with the comprehensive trip rate calculation module 109 and is used for providing a corresponding lightning protection performance improvement suggestion scheme according to the calculated comprehensive trip rate.
Preferably, the data acquisition module 101 is configured to acquire parameters of the power transmission line to be evaluated, such as voltage type, voltage class, tower type, wire hanging point, wire splitting number, splitting distance, sub-wire diameter, direct current resistance, geographic terrain, tower ground resistance, lightning current density or lightning day, and typical lightning current waveform.
Preferably, the model diagram of the power transmission line to be evaluated generated by the model generation module 103 includes a tower model, a wire structure model, a lightning lead model and an insulator model.
Preferably, the comprehensive trip rate calculation module 109 calculates the comprehensive trip rate by a weighting method according to the calculation results of the counterattack trip rate calculation module 107 and the shielding trip rate calculation module 108;
in the weighting calculation of the comprehensive trip rate calculation, the proportion of different tower types in different terrains in the whole line is counted to obtain the proportion of different tower types in various terrains, then the proportion is multiplied by the counterattack/shielding attack trip rate of the corresponding tower type, and all calculation results are added to obtain the comprehensive trip rate of the line. And comparing with the trip rate limit value specified by the national standard to sequentially judge whether the trip rate of the line meets the requirement.
Preferably, the suggested scheme for improving the lightning protection performance comprises tower grounding resistance optimization and/or protection angle optimization.
Preferably, as shown in fig. 2, the lightning protection device further includes a display module 111, which is respectively connected to the data acquisition module 101, the model generation module 103, the electromagnetic transient calculation module 104, the insulator flashover judgment module 105, the gap breakdown judgment module 106, the comprehensive trip rate calculation module 109, and the lightning protection performance improvement suggestion module 110, and is configured to display the acquired parameter data, the generated model map, the electromagnetic transient calculation result, the insulator flashover judgment result, the gap breakdown judgment result, the comprehensive trip rate calculation result, and the lightning protection performance improvement suggestion scheme.
Preferably, as shown in fig. 3, the insulator breakdown judging module further includes an input control module 112, which is respectively connected to the data collecting module 101, the insulator flashover judging module 105, and the gap breakdown judging module 106, and is configured to process the collected data of the insulator criterion and the breakdown gap criterion.
As shown in fig. 4, a method for calculating the difference of lightning withstand levels of a power transmission line, which uses the system for calculating the difference of lightning withstand levels of a power transmission line, includes the following steps:
step (1), collecting parameter data of a power transmission line to be calculated;
step (2), according to the data collected in the step (1), calling a corresponding model template in a basic database module to generate a model diagram of the power transmission line to be calculated;
step (3), performing electromagnetic transient calculation according to the data acquired in the step (1) and the model diagram of the power transmission line to be evaluated generated in the step (2);
step (4), judging whether insulator flashover occurs or not according to the calculation result of the step (3); if yes, calculating the counterattack trip rate; if not, the counterattack trip rate is not calculated;
step (5), judging whether gap breakdown occurs according to the calculation result of the step (3); if yes, calculating the shielding failure trip rate; if not, the shielding failure trip rate is not calculated;
step (6), calculating the comprehensive trip rate according to the counterattack trip rate and the shielding attack trip rate obtained in the step (4) and the step (5) through a weighting method;
and (7) calculating the obtained comprehensive trip rate to provide a corresponding lightning protection performance improvement proposal.
Preferably, the method further comprises the following steps: predicting and calculating the transformation effect in the lightning protection performance transformation proposal; the improvement effect comprises that when the lightning trip-out rate of a given line exceeds a limit value, the line needs to be subjected to lightning protection improvement. The general principle of lightning protection improvement is that the reduction of tower ground resistance is given priority to consideration, and in addition, measures such as increasing the length of an insulator string, additionally installing a lightning arrester, improving a protection angle and the like can be taken into consideration for a part of towers with high trip-out rate. Until the comprehensive tripping rate of the tower is smaller than the national standard limit value.
The invention must be scientific in the establishment of computational theories, determination of final breakdown criteria and creation of various computational models. The method can truly reflect the real lightning stroke process of the nature and the electromagnetic transient process when the tower is struck by lightning, and is not an assumed model and an empirical formula used in the traditional calculation. The method comprises the following steps:
and establishing an electromagnetic transient calculation theory. In order to overcome the problems in the traditional lightning overvoltage analysis method, the invention provides a lightning transient analysis method of a power system in a full-wave process, and the basic principle is to consider the actual wave process of an overground power transmission and transformation system, an underground grounding device and a grounding system at the same time.
By establishing an equivalent circuit model of the system, the transient models of the transmission line and the tower on the ground are directly connected with the model of the grounding system, wherein the tower of the transmission line can be equivalent by a single-conductor transmission line with certain wave impedance, and thus, a full transmission line model is formed.
And determining a lightning lead model. The lightning up-and-down leader develops along the maximum direction of the electric field, and the development speed meets a certain relation. The model explains the relation between lightning current and pilot channel charge, charge distribution in the pilot channel, initial criterion of head-on pilot, and criterion determination of final breakdown. When the average field strength of the gap between the two pilot heads exceeds the breakdown field strength of air, the gap is broken down and a lightning strike occurs.
An insulator model is determined. The invention adopts a pilot length method as the basis for judging whether the insulator has flashover or not, and when the pilot length in the gap reaches the gap length, the insulator is in flashover.
An insulator model is determined. The invention adopts a pilot length method as the basis for judging whether the insulator has flashover or not, and when the pilot length in the gap reaches the gap length, the insulator is in flashover.
A final gap breakdown criterion is determined. The method takes 500kV/m of critical breakdown field intensity between a lightning pilot and a head-on pilot or a ground object (a ground wire and a tower); and the critical breakdown field strength between the lightning leader and the ground is 750kV/m as a final criterion.
And determining a tower charge model for lightning strike-around level analysis. The main idea of simulating the pole tower is a charge simulation method, and the simulation charge is placed inside the pole tower, so that the pole tower is simulated.
And determining a tower model for calculating the lightning-resistant horizontal analysis of counterattack. The two auxiliary tower models at the outermost side are connected to the auxiliary tower model at the inner side through a longer power transmission line,and then the transmission line with the length of the gear distance is connected to the main tower model. Z in tower model adopted in lightning counterattack calculation A1 、Z A2 、Z A3 、Z B1 、Z B2 、Z B3 Equal-value transmission line of tower cross arm, Z T1 、Z T2 、Z T3 、Z T4 Equal-value transmission line Z of tower trunk L1 、Z L2 、Z L3 、Z L4 、Z L5 、Z L6 、Z L7 Respectively showing the calculated equivalent transmission lines of the support, wherein R is the tower impulse grounding resistance, as shown in figure 6.
The electromagnetic transient calculation theory adopts a full-wave process electric power system lightning transient analysis method, and considers the actual wave process of an overground power transmission and transformation system, an underground grounding device and a grounding system.
And finally, the scientific value of the breakdown criterion enables the judgment on whether the lightning trip occurs to be more accurate.
A pilot method is adopted as an insulator flashover criterion, and a lightning flashover process is reflected more truly.
And providing a lightning trip-out algorithm of the pilot development method based on the pilot development model.
The system can calculate the counterattack and shielding failure trip-out rate of each base tower and the comprehensive lightning trip-out rate step by step, realize differential analysis and further output a calculation result.
The above technical solution of the embodiment of the present invention is described in detail below with reference to the application examples:
the application example of the invention aims to realize the more accurate differential evaluation of the lightning protection performance of the power transmission line by establishing a simulation model matched with natural phenomena such as lightning, geographic terrain, tower structure, lead structure and the like and scientific and strict critical value setting of flashover and breakdown final criteria, adopting a more scientific electromagnetic transient full-wave theoretical algorithm to obtain the lightning voltage over-development process of the edge surface of the insulator and a research result of the final criteria of gap breakdown based on a pilot expansion theory.
For example, in the lightning protection performance evaluation process, firstly, an insulator surface lightning voltage curve, gap breakdown field strength and gap length are obtained through electromagnetic transient calculation. And (3) carrying out three-dimensional planning on the gap space and the lead to obtain a voltage value and a field intensity value which meet final criteria of insulator flashover and gap breakdown, and taking an insulator flashover and gap breakdown threshold value as a program to calculate and judge conditions for judging whether counterattack and shielding attack lightning trip-out rate are needed or not. And then, calling a lightning counterattack and shielding failure calculation subprogram to calculate the counterattack and shielding failure trip rate. And finally, obtaining the comprehensive tripping rate of each base tower by a weighting method.
It should be noted that, as can be understood by those skilled in the art, the criterion threshold setting and the counterattack/shielding failure trip rate algorithm are the most central technical elements affecting the lightning trip rate calculation. And the lightning protection performance of the line is evaluated by paying more attention to the tower and the terrain which are easy to strike in the line rather than the lightning trip-out rate of the whole line.
In a possible implementation manner, the setting based on the flashover and the breakdown threshold value follows repeated verification and theoretical explanation of results obtained by various results of simulation calculation, simulation experiment and true experiment.
By the embodiment, the problems of algorithm models, boundary conditions, theoretical explanation and conclusion verification are solved.
In a possible implementation mode, the differential lightning protection performance evaluation is realized on each base tower under the conditions of different voltage types, different voltage grades, different tower models, different terrains and the like according to an advanced counterattack and shielding failure lightning trip-out rate algorithm, so that the accurate and reliable comprehensive lightning trip-out rate is obtained;
through the embodiment, further lightning protection performance optimization design and improvement measures can be given according to different lightning trip-out rates.
The tower grounding resistance is calculated by adopting a non-uniform soil layered structure model. And according to the influence of the tower grounding resistance on the result of the accumulative trip rate, the economical efficiency and feasibility of technical transformation are evaluated.
The protection angle optimization considers factors such as the change of the distribution condition of the induced current of the ground wire caused by the coupling condition of the line after the protection angle is changed, the influence on the electromagnetic environment index and the like.
By the embodiment, the quantitative calculation of the differential evaluation of the lightning protection performance of the power transmission line is realized by using a computer technology. And the theoretical research results and the research process are converted into application tools for guiding production practice.
In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, invention lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. To those skilled in the art; various modifications to these embodiments will be readily apparent, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".
Those of skill in the art will also appreciate that the various illustrative logical blocks, units, and steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate the interchangeability of hardware and software, various illustrative components, elements, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. 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 embodiments.
Various illustrative logic blocks described in the embodiments of the present invention may be developed for the second time through a reserved interface, thereby expanding the application of the present technology and software.
The steps of the method or algorithm described in the embodiments of the present invention may also be directly embedded in hardware, a software module executed by a processor, or a combination of the two, so as to form a portable lightning protection performance evaluation device. A software module may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPRO M memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. For example, a storage medium may be coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC, which may be disposed in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.
In one or more exemplary designs, the functions described above in connection with the embodiments of the invention may be implemented in hardware, software, firmware, or any combination of the three. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media that facilitate transfer of a computer program from one place to another. Storage media may be any available media that can be accessed by a general purpose or special purpose computer. For example, such computer-readable media can include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to carry or store program code in the form of instructions or data structures and which can be read by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Additionally, any connection is properly termed a computer-readable medium, and, thus, is included if the software is transmitted from a website, server, or other remote source via a coaxial cable, fiber optic cable, twisted pair, digital Subscriber Line (DSL), or wirelessly, e.g., infrared, radio, and microwave. Such discs (disk) and disks (disc) include compact disks, laser disks, optical disks, DVDs, floppy disks and blu-ray disks where disks usually reproduce data magnetically, while disks usually reproduce data optically with lasers. Combinations of the above may also be included in the computer-readable medium.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A power transmission line lightning resistance level differentiation calculation system is characterized by comprising:
the data acquisition module (101) is used for acquiring parameter data of the power transmission line to be calculated;
the basic database module (102) is used for storing various types of tower model templates, insulator model templates, lead model templates and lightning leading model templates;
the model generation module (103) is respectively connected with the data acquisition module (101) and the basic database module (102) and is used for calling corresponding model templates in the basic database module (102) according to the data acquired by the data acquisition module (101) to generate a model diagram of the power transmission line to be calculated;
the electromagnetic transient calculation module (104) is respectively connected with the data acquisition module (101) and the model generation module (103) and is used for performing electromagnetic transient calculation according to the data acquired by the data acquisition module (101) and the model diagram of the power transmission line to be evaluated, which is generated by the model generation module (103);
the insulator flashover judging module (105) is connected with the electromagnetic transient calculating module (104) and is used for judging whether insulator flashover occurs or not according to the calculation result of the electromagnetic transient calculating module (104);
the gap breakdown judging module (106) is connected with the electromagnetic transient calculating module (104) and is used for judging whether gap breakdown occurs according to the calculation result of the electromagnetic transient calculating module (104);
the counterattack tripping rate calculating module (107) is connected with the insulator flashover judging module (105) and is used for calculating the counterattack tripping rate when the insulator flashover judging module (105) judges that the insulator flashover can occur;
the shielding failure trip rate calculation module (108) is connected with the gap breakdown judgment module (106) and is used for calculating the shielding failure trip rate when the gap breakdown judgment module (106) judges that the gap breakdown can occur;
the comprehensive trip rate calculation module (109) is respectively connected with the counterattack trip rate calculation module (107) and the shielding failure trip rate calculation module (108) and is used for calculating the comprehensive trip rate through a weighting method according to the calculation results of the counterattack trip rate calculation module (107) and the shielding failure trip rate calculation module (108);
and the lightning protection performance improvement suggestion module (110) is connected with the comprehensive trip rate calculation module (109) and is used for providing a corresponding lightning protection performance improvement suggestion scheme according to the calculated comprehensive trip rate.
2. The power transmission line lightning-resistant level differentiation calculation system according to claim 1, characterized in that the data acquisition module (101) is configured to acquire a voltage type, a voltage class, tower parameters, conductor structure parameters, sub-conductor parameters, a geographical terrain, tower ground resistance, lightning current waveform, lightning current density, lightning day parameters of the power transmission line to be evaluated.
3. The power transmission line lightning-resistant level differentiation calculation system according to claim 1, characterized in that the model map of the power transmission line to be evaluated generated by the model generation module (103) comprises a tower model, a wire structure model, a lightning lead model and an insulator model.
4. The system for calculating the lightning withstand level difference of the power transmission line according to claim 1, wherein the comprehensive trip rate calculating module (109) calculates the comprehensive trip rate by a weighting method according to the calculation results of the counterattack trip rate calculating module (107) and the shielding failure trip rate calculating module (108); firstly, the proportion of different tower types in different terrains in the whole line is counted to obtain the proportion of different tower types in various terrains, then the proportion is multiplied by the counterattack tripping rate and the shielding attack tripping rate of the corresponding tower type, and all calculation results are added to obtain the comprehensive tripping rate of the line.
5. The power transmission line lightning withstand level differentiation calculation system according to claim 1, wherein the lightning protection performance improvement proposal comprises tower ground resistance optimization and/or protection angle optimization.
6. The power transmission line lightning resistance level differentiation computing system according to claim 1, further comprising a display module (111) respectively connected to the data acquisition module (101), the model generation module (103), the electromagnetic transient calculation module (104), the insulator flashover judgment module (105), the gap breakdown judgment module (106), the comprehensive trip rate calculation module (109), and the lightning protection performance improvement suggestion module (110), and configured to display the acquired parameter data, the generated model map, the electromagnetic transient calculation result, the insulator flashover judgment result, the gap breakdown judgment result, the comprehensive trip rate calculation result, and the lightning protection performance improvement suggestion scheme.
7. The system for calculating the lightning withstand level difference of the power transmission line according to claim 1, further comprising an input control module (112) respectively connected to the data acquisition module (101), the insulator flashover judgment module (105) and the gap breakdown judgment module (106) for processing and acquiring insulator criterion and breakdown gap criterion data.
8. A power transmission line lightning-resistant level difference calculation method adopts the power transmission line lightning-resistant level difference calculation system of any one of claims 1~7, and is characterized by comprising the following steps:
step (1), collecting parameter data of a power transmission line to be calculated;
step (2), according to the data collected in the step (1), calling a corresponding model template in a basic database module to generate a model diagram of the power transmission line to be calculated;
step (3), performing electromagnetic transient calculation according to the data acquired in the step (1) and the model diagram of the power transmission line to be evaluated generated in the step (2);
step (4), judging whether insulator flashover occurs or not according to the calculation result of the step (3); if yes, calculating the counterattack tripping rate; if not, the counterattack trip rate is not calculated;
step (5), judging whether gap breakdown occurs according to the calculation result of the step (3); if yes, calculating the shielding failure trip rate; if not, the shielding failure trip rate is not calculated;
step (6), calculating the comprehensive trip rate by a weighting method according to the counterattack trip rate and the shielding attack trip rate obtained in the step (4) and the step (5);
and (7) calculating the obtained comprehensive trip rate to provide a corresponding lightning protection performance improvement proposal.
9. The method for calculating the lightning withstand level difference of the power transmission line according to claim 8, further comprising: and according to the calculation result of the trip-out rate of each base tower in the whole line and a high-to-low arrangement method, providing a tower list which obviously influences the comprehensive trip-out rate of the whole line and suggests preferential reconstruction.
10. The method for calculating the difference of lightning withstand levels of the power transmission line according to claim 9, further comprising: predicting and calculating the transformation effect in the lightning protection performance transformation proposal; the improvement effect comprises the steps that when the grounding resistance or the protection angle of a given tower respectively reaches a certain reachable value, the lightning trip-out rate prediction result of the base tower is calculated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110701422.1A CN113536721B (en) | 2021-06-23 | 2021-06-23 | System and method for calculating lightning resistance level difference of power transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110701422.1A CN113536721B (en) | 2021-06-23 | 2021-06-23 | System and method for calculating lightning resistance level difference of power transmission line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113536721A CN113536721A (en) | 2021-10-22 |
| CN113536721B true CN113536721B (en) | 2023-04-07 |
Family
ID=78125737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110701422.1A Active CN113536721B (en) | 2021-06-23 | 2021-06-23 | System and method for calculating lightning resistance level difference of power transmission line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113536721B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102854415A (en) * | 2012-08-06 | 2013-01-02 | 广东电网公司东莞供电局 | Method for assessing lightning flashover risks of regional power grid lines |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156787B (en) * | 2011-04-21 | 2012-12-12 | 广东电网公司佛山供电局 | Lighting flashover risk evaluation model and method of regional transmission line |
| CN103412995B (en) * | 2013-08-08 | 2018-07-10 | 深圳供电局有限公司 | A kind of thunder damage protection risk automatic assessment method for power transmission line |
| CN105321027A (en) * | 2014-08-04 | 2016-02-10 | 国家电网公司 | Lightning protection method and apparatus for power transmission line |
| CN111917176B (en) * | 2020-06-01 | 2023-06-16 | 云南电网有限责任公司大理供电局 | 35kV power transmission line lightning information system and analysis method thereof |
| CN113011099A (en) * | 2021-03-26 | 2021-06-22 | 云南电网有限责任公司电力科学研究院 | Method for calculating and correcting lightning trip-out rate of power transmission line |
-
2021
- 2021-06-23 CN CN202110701422.1A patent/CN113536721B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102854415A (en) * | 2012-08-06 | 2013-01-02 | 广东电网公司东莞供电局 | Method for assessing lightning flashover risks of regional power grid lines |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113536721A (en) | 2021-10-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107992962B (en) | Power transmission line lightning protection measure optimal selection method based on entropy weight method | |
| CN102841280B (en) | Method for simulating lightning trip-out rates of 500kV transmission line with four circuits on same tower | |
| CN105224797B (en) | A kind of extra-high voltage large cross line counterattack trip-out rate computational methods | |
| Darveniza et al. | Modelling for lightning performance calculations | |
| CN103488815A (en) | Transmission line lightning shielding failure risk evaluation method | |
| CN105242133A (en) | Improved method for calculating lightning trip-out rate of distribution line | |
| Datsios et al. | Insulator string flashover modeling with the aid of an ATPDraw object | |
| Guo et al. | A three‐dimensional direct lightning strike model for lightning protection of the substation | |
| CN108614192B (en) | Distribution decision method for lightning monitoring device of power distribution network | |
| CN116109133A (en) | Risk early warning method for thunderstorm weather power transmission line | |
| CN102637219A (en) | Lightning fractal method based on charge simulation method and finite difference method in power system | |
| CN112257238A (en) | Method and device for evaluating insulation damage risk of circuit breaker under multiple thunder | |
| CN113536721B (en) | System and method for calculating lightning resistance level difference of power transmission line | |
| CN103399190B (en) | Based on the computing method of the distribution line induced overvoltage of PSCAD/EMTDC | |
| CN105929264B (en) | A kind of 750kV transmission line thunderbolts performance estimating method | |
| CN104573267B (en) | A kind of emulation mode assessed ultra-high voltage transformer station and enter line segment thunderbolt security | |
| CN117291418A (en) | Line lightning hazard risk assessment method and device based on distributed monitoring data | |
| Datsios et al. | Impulse resistance of concentrated tower grounding systems simulated by an ATPDraw object | |
| Shafaei et al. | Probabilistic evaluation of lightning performance of overhead transmission lines, considering non-vertical strokes | |
| Engelbrecht et al. | Insulation coordination and statistical evaluation of the lightning performance with ATP/EMTP | |
| CN114896815A (en) | Lightning monitoring terminal distribution point analysis method and device for multi-branch distribution line | |
| Ahmadi et al. | Quantifying the shielding effect of trees against lightning strikes for power transmission lines | |
| Koehler et al. | Analysis of flashover mitigation measures to improve the lightning performance of transmission lines | |
| CN113406400B (en) | Method and system for measuring voltage and current characteristics of continuous lightning stroke along line | |
| Shafaei et al. | Advanced statistical method for evaluating of lightning performance of overhead transmission lines based on accurate modelling and considering non-vertical strokes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |