Transmission conductor galloping numerical simulation method

Abstract

The invention discloses a transmission conductor galloping numerical simulation method. The method comprises the following steps: S1, obtaining an icing section shape and icing shape distribution of a transmission conductor; s2, acquiring an aerodynamic load G of the ice-coated conductor; s3, acquiring an electromagnetic load F of the wire; s4, establishing a line finite element analysis model by adopting ABAQUS finite element software; s5, defining a user-defined unit sharing a node with the wire; s6, compiling a user-defined unit subprogram corresponding to the user-defined unit; and S7, synchronously submitting the line segment inp file containing the user-defined unit in the step S5 and the user-defined unit subprogram for file in the step S6. When the transmission line galloping numerical simulation is carried out, the influence of the icing section shape and the icing distribution characteristic on the aerodynamic load, the influence of the relative distance of the conductor on the aerodynamic coefficient and the influence of the electromagnetic force on the galloping numerical simulation are considered, so that the accurate simulation of the transmission line galloping process is realized; and support is provided for line galloping characteristic and anti-galloping research.

Description

technical field [0001] The invention relates to the technical field of galloping prevention of transmission lines, in particular to a numerical simulation method for galloping of power transmission wires. Background technique [0002] The galloping of transmission lines involves the intersection of aerodynamics, vibration mechanics, structural mechanics and other disciplines, and due to the influence of the structural stiffness of the conductor itself, it is a large-displacement strong nonlinear problem. At present, the gallop analysis of transmission lines mainly adopts four types of methods: mechanism research based on simplified model, true model test research, segmental model wind tunnel test research and numerical simulation research. Among them, numerical simulation research has the characteristics of high speed, high accuracy and wide application range, and has become an important means of transmission line galloping research. [0003] At present, the commonly used n...

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Problems solved by technology

[0003] Currently commonly used numerical simulation methods for galloping include the modal superposition method and time-history analysis method, among which the time-history analysis method can more accurately reflect the motion state of the wire, but because galloping needs to be obtained in real time based on the displacement, rotation angle and other characteristics of each sub-wire The aerodynamic coefficient in the current state updates the aerodynamic and other loads on each area of ​​the wire in real time. However, the existing finite element analysis software cannot directly realize the simulation and application of aerodynamic and other loads. It is necessary to independently develop real-time calculations and apply galloping loads during time history analysis. User-Defined Units and User-Defined Programs for

[0004] Moreover, the existing galloping numerical simulation method only considers the aerodynamic load when performing galloping numerical simulation, and only considers the aerodynamic load under the condition of different wind attack angles, and does not consider the aerodynamic load under the condition of different relative positions between the sub-conductors. Considering the electromagnetic force between transmission lines, and without considering the cross-section characteristics and ice distribution characteristics of ice-coated conductors, the existing galloping numerical simulation method has certain limitations in the study of galloping characteristics of ice-coated conductors, and it is impossible to accurately obtain the true value of transmission lines. dancing characteristics

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