Analysis of the Seismic Performance of ±500 kV Flexible DC Converter Valves

Can Ding, Yifan Liu (), Pingjie Zhu, Jinqi Li and Guang Pu
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Can Ding: College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443000, China
Yifan Liu: College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443000, China
Pingjie Zhu: Wuhan Ship Communication Institute, Wuhan 430079, China
Jinqi Li: College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443000, China
Guang Pu: College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443000, China

Energies, 2023, vol. 16, issue 17, 1-15

Abstract: The converter valve is the core equipment of flexible DC transmission, but it has been severely damaged in previous earthquakes. Therefore, the seismic performance of its structure has a significant impact on the safety and reliability of power transmission. To study the seismic performance of ±500 kV flexible DC converter valves and identify weak links in the supporting valve tower, this article first established a refined finite-element model of a valve tower based on its physical structure; then modal analysis on the valve tower was conducted; finally, time-domain analysis of the valve tower under three seismic excitations, namely Wenchuan, EI Centro, and artificial, was conducted, and the equivalent stress and directional displacement cloud maps of the key parts of the valve tower were obtained. The research results indicate that the dynamic characteristics of the valve tower are relatively complex, with low fundamental frequency and diverse natural vibration modes. Under earthquake action, the predominant frequency of EI Centro waves is close to the fundamental frequency of the valve tower, which is prone to resonance and causes significant damage to the valve structure. The improved design of the valve tower meets the seismic strength requirements of level 8 seismic intensity.

Keywords: earthquakes; seismic performance; supported valve towers; modal analysis; time-domain analysis method; flexible DC converter valves (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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