Optimization of group AC/DC hybrid offshore electrical system for offshore wind farms

The exploration of offshore wind power has shown a definite trend of clustering and rapid development from the shore to the far ocean. This has created new challenges for offshore electrical system (OES) planning for offshore wind farm clusters (OWFCs) because high-voltage alternating current (HVAC) transmission is no longer the only optimal choice. The limitations of transmission capacity and distance restrict the applications of HVAC transmission systems and have led to research on AC&DC hybrid OES. Distributed offshore wind farms (OWFs) in the OWFC and nonpredetermined alternating current/direct current (AC/DC) transmission systems for OWFs demonstrate some new features. This paper presents a mixed-integer linear programming (MILP) model for the OES optimization of the OWFC. Based on a definition of a set of 0–1 decision variable matrices and the linilization of nonlinear variables with auxiliary binary decision variables, CPLEX is introduced to solve the problem. The case results show the effectiveness of the proposed methodology. Some suggestions for the AC/DC hybrid OES planning of the OWFC have also been proposed.