Innovative seismic design aspects of the Intermountain Power Project Converter Stations

Larder, R.A.; Gallagher, Richard H.; Nilsson, Börje

doi:10.1109/61.32663

Cited by 11 publications

(4 citation statements)

References 2 publications

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“…Lander et al [1] compared the seismic performance of two types of converter valves, supported and suspended, in 1989. Considering that the base frequency of the supported converter valve is between 0.7 Hz and 7 Hz, the base frequency of the suspended converter valve is between 0.1 Hz and 0.2 Hz, avoiding the main seismic frequency.…”

Section: Introductionmentioning

confidence: 99%

Research on Vibration Damping Analysis of UHV Suspended Converter Valve Model

Zhang,

Lin,

et al. 2023

J. Phys.: Conf. Ser.

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The UHV (ultra high voltage) suspended converter valve is hinged to the top of the valve hall, so the equipment has a long structural period, the suspended converter valve is displaced under the action of earthquakes, and the valve tower is susceptible to damage due to interaction with the important equipment connected to it. The high cost, large size, and weight of the real type of UHV suspended converter valve make it difficult to carry out shaking table test studies of the real type of equipment. In this paper, a numerical model of a UHV-suspended converter valve scaling device and its damping structure model are established, and a damping analysis study with damping at the top of the converter valve model is carried out. The analysis showed that the maximum displacement of the converter tower was 136.3 mm under the action of a 0.4 g El-Centro earthquake. With horizontal damping at the top, the maximum displacement of the converter tower is 62.9 mm, a reduction of 53.9% compared to the undamped case. This study proposes a vibration damping design for UHV suspended converter valve, laying the foundation for subsequent shaker test studies of the scaled-down model vibration damping structure of the UHV suspended converter valve and the productization of vibration dampers for the equipment.

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Section: Introductionmentioning

confidence: 99%

Research on Vibration Damping Analysis of UHV Suspended Converter Valve Model

Zhang,

Lin,

et al. 2023

J. Phys.: Conf. Ser.

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“…At present, existing research on the seismic performance of converter valve towers has mainly been performed using onshore substations. Ekström and Larder et al [18,19] compared the structural features and anti-seismic performance of supported and suspended valve towers. They believed that a suspended valve tower could dramatically dampen the seismic action, although it underwent a large horizontal displacement.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Analysis of an Offshore Converter Platform with Valve Towers under Seismic Excitation

Sun

Zhao

et al. 2022

Symmetry

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Converter valves are the core equipment of offshore wind power structures. However, they are highly vulnerable to vibration under strong earthquakes, which will affect normal operation of the offshore wind farm. Converter station is an axisymmetric structure with obvious asymmetry in its internal configuration of the superstructure. This study aimed to analyze the dynamic response of a supported converter valve in an offshore converter station under seismic excitation. The coupling model of the supported valve tower group and the converter station were established, and the distribution law of the valve tower dynamic response and foundation settlement were investigated. The dynamic response effect of the modal truncation, valve tower stiffness, and basic size on different areas and foundations of the valve towers were studied. The findings were as follows: (i) the effect of local vibration of the valve tower should not be simplified by using equivalent mass and node condensation; (ii) the structure–equipment coupling analysis method should be used to review the structural design scheme of the offshore converter station in the intensity VII region; (iii) the vertical higher-order modes should be considered during the vibration response calculation and its participation ratio in mass should not be lower than 90%; (iv) the frequency range that minimizes the vibration response is the characteristic frequency range of horizontal vibration, while the best vibration suppression effect cannot be obtained in both the horizontal and vertical directions; and (v) the stiffness of the valve tower itself should be adjusted and different stiffness designs of the valve tower in different positions should be adopted to realize effective vibration response control.

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“…The influence of initial stress on the natural frequency and other dynamic characteristics of beams and trusses systems has been concerned and studied by many scholars [8][9][10][11][12]. For the supported valve, few scholars and engineers have paid attention to the effect of initial displacement on its dynamic characteristics, and similarly, the seismic performance of converter valve has not been considered in the existing literatures [7,[13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Research on Seismic Analysis of Converter Valve of Offshore Flexible High Voltage Direct Current Considering the Effect of Initial Displacement

Zhang¹,

Xiao²,

Lv³

et al. 2021

E3S Web Conf.

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Due to the acceleration of global energy transformation and the reduction of the cost of new energy, offshore wind power has been attached great importance by many countries. Therefore, offshore wind power transmission based on flexible HVDC transmission technology has become a hot issue in the development and research of offshore wind power. When the offshore platform is running for a long time, there may be extreme conditions of encountering earthquake. As the core component of flexible HVDC transmission, converter valve's structural safety research under earthquake is very necessary. Different from the onshore converter station and limited by the installation environment, the bottom support insulator of offshore converter valve tower may have initial displacement after being installed on the foundation plate of offshore platform. However, there is no literature on the effect of initial displacement on the dynamic characteristics and seismic performance of valve towers. In this paper, a practical engineering valve tower is taken as an example. Firstly, the influence of different initial displacements on the dynamic characteristics of valve tower is studied. Then, the dynamic analysis of valve tower under earthquake load is carried out by using time history integration algorithm. The influence of initial displacement on the structural safety of valve tower is studied by comparison method. The results of this paper can provide reference for similar projects.

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Innovative seismic design aspects of the Intermountain Power Project Converter Stations

Cited by 11 publications

References 2 publications

Research on Vibration Damping Analysis of UHV Suspended Converter Valve Model

Research on Vibration Damping Analysis of UHV Suspended Converter Valve Model

Dynamic Response Analysis of an Offshore Converter Platform with Valve Towers under Seismic Excitation

Research on Seismic Analysis of Converter Valve of Offshore Flexible High Voltage Direct Current Considering the Effect of Initial Displacement

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