Overvoltage Analysis of Submarine Cables based on Detailed Electromagnetic Transient Model

Three-core submarine cables are mostly used in offshore wind power transmission recently. The capacitive effect of long-distance submarine cables may cause overvoltage along the line. At present, the analysis of the overvoltage in the offshore wind power transmission line is mainly based on the simplified equivalent model, but the influence of the detailed structure and characteristic parameters of the cables should not be neglected. Therefore, a detailed electromagnetic transient model of submarine cable is established in this paper. And it is used to analyze the overvoltage of the offshore wind power transmission line. Simulation results show that the detailed model of three-core submarine cable is more accurate than the simplified equivalent model. The detailed model will show a more accurate magnitude of overvoltage level which is higher than the simplified model. Besides, the importance of establishing an electromagnetic transient model is also verified in the three-phase closing overvoltage analysis.