Overvoltage Mechanism of Offshore Wind Farm Based on 66 kV Submarine Cable Transmission System

With the development of offshore wind farms towards farther seas and larger scales, the application of 66 kV submarine cables has improved transmission efficiency and reduced unit costs, but at the same time, there is also a risk of overvoltage. This article uses LTB ANDES software to conduct detailed modeling of offshore wind farms and their transmission systems, and accurately corrects the parameters of submarine cables. Through simulation calculations, the article studies the power frequency overvoltage of offshore wind farms and their transmission systems under different operating conditions, and also analyzes the impact of wind farm capacity and the number of wind turbines on power frequency overvoltage, as well as how to effectively suppress overvoltage phenomena through technical means to ensure the stability and efficiency of the power system. Experimental data shows that the installation of high-voltage reactors and other technical means can effectively reduce overvoltage, with the DC (direct-current) energy dissipation device showing the highest suppression effect (up to 30%).