Mitigation of background harmonic amplification caused by offshore wind farm long AC cable integration

The high voltage alternating current transmission with submarine cables is the common scheme to integrate offshore wind farms close land. Due capacitive effect of AC cables, association long and onshore grid can cause resonances, which may amplify background harmonics. This paper focuses on mitigation harmonic amplification caused by farm integration. First, mechanism in integration system analysed qualitatively, approaches are given principle. Then, taking a practical project as study case, modelling methods elaborated, including models turbines, transformers, extra-high grid, low distribution network. According established models, analysed. On this basis, two installing series blocking filter shunt compared recommended proposed. Finally, feasibility proposed verified calculation results under different operating conditions.