Abstract
With the rapid development of the direct-current grid technology and construction, the flexible direct-current transmission technology has been widely used in many aspects, such as long-distance large-capacity power transmissions, offshore platforms and island power supplies. The offshore flexible direct current converter valve will encounter a variety of unfavorable loads during the marine transportation and the long-term operation on the sea. The safety requirements of the offshore flexible direct current converter valve are higher as a result. Based on the structural characteristics of the converter valve, the converter valve is calculated by finite element method. Under two working conditions of the marine transportation and the long-term operation on the sea, this paper carries out modal analysis and random vibration analysis of the converter valve tower respectively. This paper gives the unfavorable position of the force from the calculation results, and provides a reference for the design and selection of the flexible direct current converter valve to meet the needs of the offshore converter station’s construction.
Highlights
Compared with traditional DC transmission, flexible DC transmission technology has many advantages, such as the independent control of active and reactive power, low requirements for AC systems, 4-quadrant operations, passive network power supplies, and smaller floor spaces[1]
Large-scale offshore wind power transmission projects based on flexible DC transmission technology have become a hot spot for offshore wind power development, and it has become the focus of research scholars in related fields[5]
The offshore flexible converter station and converter valve may encounter a variety of unfavorable loads during marine transportation and long-term operation on the sea, which is more complicated than the environment faced on land
Summary
Compared with traditional DC transmission, flexible DC transmission technology has many advantages, such as the independent control of active and reactive power, low requirements for AC systems, 4-quadrant operations, passive network power supplies, and smaller floor spaces[1]. The offshore flexible converter station and converter valve may encounter a variety of unfavorable loads during marine transportation and long-term operation on the sea, which is more complicated than the environment faced on land. Ensuring the safety and integrity of the flexible converter valve tower in marine transportation and long-term operation on the sea is the key to ensuring the safe and efficient operation of flexible DC transmission projects. In order to study the dynamic response of the offshore flexible DC converter valve during marine transportation and long-term operation on the sea, this paper creates a finite element model based on the structural characteristics of the flexible DC converter valve. For the loads encountered in the above two working conditions, different acceleration power spectral densities are obtained as input conditions, and the modal analysis and random vibration analysis of the converter valve tower are carried out respectively
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