Seismic Response Analysis according to Support Conditions for HVDC

Recently, with the increasing frequency and intensity of earthquakes in South Korea, the country can no longer be considered a safe zone. In regions where earthquakes are more frequent, suspended models with low seismic responses are commonly used to enhance the seismic performance of high-voltage direct current(HVDC) systems. However, in South Korea, ground models that are directly mounted on the floor have traditionally been installed. Therefore, this study aims to evaluate the applicability of suspended models by comparing the seismic responses of various support types. To facilitate this comparison, a response spectrum analysis was conducted for the ground-mounted model, while a transient analysis was performed for the suspension-type model in accordance with IEEE-693 standards. Additionally, a spring-damper system was applied to the suspended model to improve its efficiency, and the associated damping effects were analyzed. These findings are anticipated to lay the groundwork for evaluating the internal performance of HVDC facilities.