CN-122021186-A - Power transmission line icing galloping analysis method and system

CN122021186ACN 122021186 ACN122021186 ACN 122021186ACN-122021186-A

Abstract

The invention belongs to the technical field of operation and maintenance of a power transmission line, and provides a power transmission line icing galloping analysis method and system, wherein parameterization modeling is carried out on the section of an icing lead, crescent icing and fan icing geometric representations are respectively established, aerodynamic coefficients of the lead under different wind speeds and wind attack angles are calculated according to the established geometric representations, and then a multi-degree-of-freedom dynamics system equation is established, so that modeling of galloping behavior is realized; the method comprises the steps of establishing a knowledge graph, establishing an inference link from input parameters to galloping judgment and galloping range, obtaining environment parameters and wire parameters of a target period as input parameters, judging the galloping state of the wire by using the established knowledge graph, evaluating stability, and iteratively calculating the galloping range of the wire in the vertical, horizontal and torsion directions by using a multi-degree-of-freedom dynamics system equation based on the environment parameters and the wire parameters. The invention improves the analysis efficiency.

Inventors

LIU TIAN
LIU LEI
HUANG KAI
WANG QINGZE
LI PENG
GUO JINJIAN
XU YONGSHENG
LI FAZHAN
ZHANG ZIHENG
TANG CHENGLIN

Assignees

国网山东省电力公司菏泽供电公司
山东大学

Dates

Publication Date: 20260512
Application Date: 20260331
Priority Date: 20260127

Claims (10)

1. The method for analyzing the icing galloping of the power transmission line is characterized by comprising the following steps of: parameterizing and modeling the section of the icing wire, respectively establishing geometric representations of crescent icing and fan-shaped icing, wherein the windward forefront point of the crescent icing is positioned at the outer edge of the icing, the leeward furthest point is positioned at the back of the bare wire, and the fan-shaped icing is covered to the right behind leeward; According to the established geometric representation, aerodynamic coefficients of the lead under different wind speeds and wind attack angles are calculated, and then a multi-degree-of-freedom dynamics system equation is established, so that modeling of galloping behaviors is realized; Constructing a knowledge graph, wherein nodes of the knowledge graph comprise environmental parameters, wire parameters, pneumatic stability characteristics, stability criteria and a galloping range, and establishing an inference link from input parameters to galloping judgment and galloping range; Acquiring environmental parameters and wire parameters of a target period, using the constructed knowledge graph as input parameters, judging the galloping state of the wire, and evaluating the stability; Based on the environmental parameters and the wire parameters, the galloping range of the wire in the vertical, horizontal and torsion directions is calculated iteratively by utilizing a multi-degree-of-freedom dynamics system equation.
2.A method of analyzing icing galloping of a power transmission line as recited in claim 1 wherein the step of creating a geometric representation of crescent shaped icing comprises: For crescent ice coating, the forefront point of windward is arranged at the outer edge of the ice coating, the furthest point of leeward is arranged at the back of the bare conductor, and the characteristic dimension of the section The method comprises the following steps: ; Wherein, the Is the radius of the bare conductor, Is made to be ice-thick and is made to be ice-thick, The radian range of the ice coating is used for representing the coverage degree of the wire by the ice layer; The formula is used for expressing accumulation of ice layers of crescent ice coating on windward side, and ensuring characteristic size of section Reflecting aerodynamic asymmetry.
3. A method of analyzing icing galloping of a power transmission line as recited in claim 1 wherein the process of creating a geometric representation of fan-shaped icing comprises: sectional feature size of fan-shaped ice coating The method comprises the following steps: ; Wherein, the Is the radius of the bare conductor, Is made to be ice-thick and is made to be ice-thick, The radian range of the ice coating is used for representing the coverage degree of the wire by the ice layer; The formula is used for simulating the situation that the icing is covered to the right back of the lee and reflecting the ice layer accumulation characteristic under the fan-shaped icing.
4. The method for analyzing icing galloping of power transmission line according to claim 1, wherein in the process of establishing the geometric representation of crescent ice coating and fan ice coating, the characteristic radius of the section of the ice coating wire The method comprises the following steps: ; ; Wherein, the Is the radius of the bare conductor, In order to cover the arc range of ice, Is the outer radius of the ice coating, expressed as , Is thick, and aims at crescent ice coating and fan ice coating, With different values, the ice is covered in a crescent shape With a value less than that of fan-shaped ice coating Values.
5. The method of claim 1, wherein the step of calculating aerodynamic coefficients of the wire under different wind speeds and wind attack angles according to the established geometric representation, and further establishing a multi-degree-of-freedom dynamics system equation comprises: Under the quasi-steady state assumption, aerodynamic coefficients of the lead under different wind speeds and wind attack angles are calculated, wherein the aerodynamic coefficients comprise a drag coefficient, a lift coefficient and a torque coefficient: ; ; ; Wherein, the Is air density; 、 And Respectively representing real-time resistance, lift force and torque; for the wind speed of the wind, Is the effective length of the ice-coated wire; Establishing a multi-degree-of-freedom dynamics system equation, defining displacement state vectors of the wire in vertical, horizontal and torsion directions, and performing numerical simulation of the galloping process: ; Wherein, the As a quality matrix, the unit mass of the bare conductor and the additional mass of the ice coating layer are considered simultaneously during calculation; calculating based on wire tension for the stiffness matrix; Is a damping matrix, and can be expressed as a mass matrix And stiffness matrix Is used in combination with the linear combination of (a), Is an aerodynamic vector composed of vertical component, horizontal component and torque, and is used 、、 Angle of attack with wind And (5) solving together to obtain the final product.
6. The method for analyzing ice-covered galloping of a power transmission line according to claim 1, wherein the process of establishing an inference link from input parameters to galloping decision and galloping range comprises the steps of including nodes of a knowledge graph including environmental parameters, wire parameters, aerodynamic stability characteristics, stability criteria and galloping range, wherein: an environmental parameter node for storing meteorological conditions including wind speed, wind angle of attack and air density; The wire parameter node is used for storing structural parameters of section characteristics, icing thickness, mass and moment of inertia; the aerodynamic stability characteristic node is used for storing a lift coefficient, a resistance coefficient, a torque coefficient and the change rate of the torque coefficient along with the wind attack angle; A stability criterion node comprising Den Hartog criteria and Nigol criteria; the waving range node is used for storing the predicted displacement interval; Connecting all nodes through directed edges, and constructing a logic path from input parameters to output results; Mapping the calculated aerodynamic coefficient into a knowledge graph node attribute, calculating a stability coefficient through a rule link, and generating a galloping judgment conclusion.
7. The method for analyzing icing galloping of a power transmission line according to claim 1, wherein the step of judging the galloping state of the wire by using the constructed knowledge graph comprises the steps of calculating a stability coefficient by the knowledge graph, judging the stability coefficient according to Den Hartog criteria and Nigol criteria, judging that the wire generates vertical galloping caused by resistance and lift when aerodynamic damping is negative due to combination of a lift coefficient and a resistance coefficient, and judging that the wire generates torsional galloping caused by torque when aerodynamic torsional damping is negative due to sensitivity of a torque coefficient to wind attack angle.
8. The method for analyzing the icing galloping of the power transmission line according to claim 1, wherein the process of iteratively calculating the galloping range of the wire in the vertical, horizontal and torsion directions by utilizing a multi-degree-of-freedom dynamics system equation based on the environmental parameter and the wire parameter comprises the steps of predicting the galloping range by adopting a time domain integration method, and specifically comprises the following steps: Setting an initial wind attack angle, initial displacement and initial speed of a wire; at each moment, calculating aerodynamic force components and updating acceleration; calculating to obtain new displacement and speed by adopting a gradual integration method; and (3) updating calculation of the wind attack angle, substituting the updated wind attack angle into aerodynamic calculation again, and obtaining displacement intervals of the wire in the vertical direction, the horizontal direction and the torsion direction through continuous iteration.
9. The method for analyzing icing galloping of a power transmission line according to claim 8, wherein the process of substituting the updated wind attack angle into aerodynamic force calculation and obtaining displacement intervals of the wire in the vertical direction, the horizontal direction and the torsion direction through continuous iteration comprises the steps of: ; ; ; Wherein the method comprises the steps of As a vertical component of the light, As a horizontal component of the liquid, The vertical acceleration and the torsion acceleration are calculated and updated according to the multi-degree-of-freedom dynamics system equation for the torque, 、 And Respectively represent real-time resistance, lift force and torque, Is the cross-sectional feature size; Thereafter updating the wind attack angle by using a formula according to the torsional displacement and the wire acceleration; ; Wherein, the In order to initiate the angle of attack of the wind, For the rotation angle, i.e. the torsion displacement, Is the wind speed; the updated wind attack angle is re-substituted into aerodynamic force component calculation, and the next iteration is started until the preset solving time is reached.
10. An ice coating galloping analysis system for a power transmission line, comprising: The physical modeling module is configured to perform parameterization modeling on the section of the icing wire, respectively establish geometric representations of the crescent icing and the fan-shaped icing, wherein the windward forefront point of the crescent icing is positioned at the outer edge of the icing, the leeward furthest point is positioned at the back of the bare wire, and the fan-shaped icing is covered to the right behind the leeward; The dynamics module is configured to calculate aerodynamic coefficients of the lead under different wind speeds and wind attack angles according to the established geometric representation, so as to establish a multi-degree-of-freedom dynamics system equation and realize modeling of galloping behaviors; the knowledge graph construction module is configured to construct a knowledge graph, wherein nodes of the knowledge graph comprise environment parameters, wire parameters, pneumatic stability characteristics, stability criteria and a galloping range, and an inference link from input parameters to galloping judgment and galloping range is established; The galloping state judging module is configured to acquire the environmental parameters and the wire parameters of the target period, and utilizes the constructed knowledge graph to judge the galloping state of the wire and evaluate the stability; and the galloping range prediction module is configured to iteratively calculate the galloping range of the wire in the vertical, horizontal and torsion directions by utilizing a multi-degree-of-freedom dynamics system equation based on the environmental parameter and the wire parameter.

Description

Power transmission line icing galloping analysis method and system Technical Field The invention belongs to the technical field of operation and maintenance of power transmission lines, and particularly relates to a method and a system for analyzing icing galloping of a power transmission line. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. The power grid is used as an important infrastructure for energy safety, has wide power transmission line coverage range and complex operation environment, and is often in extreme climate areas such as high altitude, low temperature, high humidity and the like. In recent years, extreme weather events frequently occur, and the risk of icing on a power transmission line is remarkably increased in disaster weather such as frost, snow storm and the like. Ice coated wires are susceptible to low frequency, large amplitude self-excited vibrations under strong winds, a phenomenon commonly known as galloping. The galloping phenomenon can lead to strand breakage, hardware fatigue, abnormal stress of towers and even collapse, seriously threaten the safe and stable operation of a power grid, and cause great economic loss and social influence. In the existing research and engineering practice, the galloping analysis of the icing wire mainly depends on finite element simulation, wind tunnel test and manual inspection. Although the finite element method and the vibrator model can describe the galloping mechanism to a certain extent, the calculation cost is high, the high-quality experimental data are depended on, the quick response requirement is difficult to meet, the wind tunnel test is high in accuracy, long in experimental period, high in cost and limited by experimental conditions, complex meteorological conditions are difficult to cover on the whole, and the problems of insufficient time effect and high safety risk exist in manual inspection. In addition, the existing method is mostly based on static or simplified models, and is difficult to effectively cope with complex situations such as wind speed fluctuation, changeable icing forms, multi-sub-conductor coupling and the like, so that the galloping prediction result has defects in the aspects of accuracy and instantaneity. Disclosure of Invention In order to solve the problems, the invention provides a method and a system for analyzing the icing galloping of a power transmission line, which utilize semantic modeling and reasoning capability of a knowledge graph and combine dynamic modeling and pneumatic analysis to realize automatic identification, stability assessment and galloping range prediction of the galloping state of the icing conductor, and by introducing the knowledge graph and an automatic modeling technology, the analysis efficiency is improved, and the galloping state is updated and predicted in real time under complex meteorological conditions, so that the dependence on experimental data and manual adjustment is remarkably reduced. According to some embodiments, the present invention employs the following technical solutions: The first aspect of the invention provides a method for analyzing icing galloping of a power transmission line. An analysis method for icing galloping of a power transmission line comprises the following steps: parameterizing and modeling the section of the icing wire, respectively establishing geometric representations of crescent icing and fan-shaped icing, wherein the windward forefront point of the crescent icing is positioned at the outer edge of the icing, the leeward furthest point is positioned at the back of the bare wire, and the fan-shaped icing is covered to the right behind leeward; According to the established geometric representation, aerodynamic coefficients of the lead under different wind speeds and wind attack angles are calculated, and then a multi-degree-of-freedom dynamics system equation is established, so that modeling of galloping behaviors is realized; Constructing a knowledge graph, wherein nodes of the knowledge graph comprise environmental parameters, wire parameters, pneumatic stability characteristics, stability criteria and a galloping range, and establishing an inference link from input parameters to galloping judgment and galloping range; Acquiring environmental parameters and wire parameters of a target period, using the constructed knowledge graph as input parameters, judging the galloping state of the wire, and evaluating the stability; Based on the environmental parameters and the wire parameters, the galloping range of the wire in the vertical, horizontal and torsion directions is calculated iteratively by utilizing a multi-degree-of-freedom dynamics system equation. As an alternative embodiment, the process of creating a geometric representation of crescent shaped ice coating includes: For crescent ice coating, the forefront point of windward