Abstract
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.
Highlights
With the acceleration of global energy transformation and the reduction of new energy costs, countries rich in marine resources gradually attach importance to the development of offshore wind power[1]
Converter station is the leader of flexible HVDC transmission system, and converter valve is the core component of converter station
In foreign countries, suspended converter valves with better seismic performance are often used in offshore flexible DC transmission projects
Summary
With the acceleration of global energy transformation and the reduction of new energy costs, countries rich in marine resources gradually attach importance to the development of offshore wind power[1]. As a new type of DC transmission system, flexible DC transmission can independently control the active and reactive power, provide synchronous AC power for wind farms, and have strong fault ride through capability It can be used as a way for large-scale, long-distance offshore wind farms to connect to the land power grid[3,4]. In foreign countries, suspended converter valves with better seismic performance are often used in offshore flexible DC transmission projects. Few scholars and engineers have paid attention to the effect of initial displacement on its dynamic characteristics, and the seismic performance of converter valve has not been considered in the existing literatures [7, 13,14,15,16]. The initial displacement value of the bottom of each supporting insulator is shown in Table 2, and the negative sign in the table indicates subsidence
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