Galloping mitigation of ice-coated conductors with hybrid nutation dampers under stochastic wind fields

Abstract

Ice-coated conductor galloping represents a critical issue to energy infrastructure security, potentially causing widespread power outages. While the effective mitigation of galloping in ice-coated conductors under realistic stochastic wind conditions remains a significant challenge in field applications. To this end, the present study addresses the galloping mitigation of ice-coated conductors under stochastic wind fields by attaching hybrid nutation dampers (HND). An integrated simulation method is first introduced, including the finite element modeling of ice-coated conductors using 3-node isoparametric cable elements, stochastic wind field simulations utilizing the spectral representation method based on wavenumber–frequency joint power spectra, and the random vibration analysis by virtue of the probability density evolution method. Modeling and parameters design of HND for vibration mitigation of ice-coated conductors are then carried out. Comparative studies are conducted on the amplitude–frequency characteristics, standard deviations and probability densities of ice-coated conductor galloping with and without HND deployments under stochastic wind fields. Key findings indicate that: (1) compared to the uncontrolled conductor, the controlled conductor has reverse transverse horizontal vibration modes since additional HND mass; (2) properly-designed HND serves dual purposes in increasing the critical wind speed for ice-coated conductor galloping and stabilizing the dynamic behaviors of the conductor; (3) similar to the uncontrolled conductor, galloping probability densities of the controlled conductor exhibit a stable periodic propagation; (4) considering stochastic wind loads can result in a safe design of control devices for mitigating ice-coated conductor galloping. This study provides a crucial theoretical foundation for galloping mitigation of ice-coated conductors and anti-galloping design of transmission lines under complex wind environments.