Effect of Seawater Immersion on Power Frequency Over Voltage Calculation of AC Three-core Submarine Cable. Issue 1 (January 2020)

• Record Type: Journal Article
• Authors: Wang, Weiyuan; Cheng, Jinmin; Sun, Yi; Liu, Jinghui; Shi, Dajun; Li, Feike
• Is Part Of: IOP conference series. Volume 740:Issue 1(2020)
• Publication Date: 2020-01
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/740/1/012094
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: AC three-core submarine cable is an important carrier to transmit offshore wind power. Limited by the laying conditions, the reactive power compensation is generally carried out at both ends of the submarine cable line. And the armour along the submarine cable is immersed by seawater until the metal sheath, which causes the sheath of the submarine cable line to be grounded everywhere. With the growth of submarine cable lines, power frequency overvoltage becomes more and more serious. In order to effectively limit power frequency overvoltage, it is necessary to study and compare the effect of different reactive power compensation schemes on overvoltage. This paper is based on the research of double loop AC three-core submarine cables. The submergence of seawater is simulated by dividing the submarine cable into sections and grounding the sheath and armour of each section of submarine cable through resistance. On the basis of this model, the changes of line power frequency overvoltage under the conditions of "55" compensation, "28" compensation and three terminal compensation are calculated and compared. Under the scheme of "28" compensation at both ends, the maximum power frequency overvoltage of the line is the lowest. The research results provide a theoretical reference for the reactive power compensation scheme of offshore wind power access system.