A new method for simultaneous optimizing of wind farm’s network layout and cable cross-sections by MILP optimization

•Simultaneous optimization of wind farm’s network layout and cable cross-sections.•Proposed method brings substantial cost savings compared with other methods.•Usefulness and effectiveness of the MILP optimization was demonstrated.•Electrical losses need to be taken into account in the design process.•An absolute optimal solution (GAP=0) is received in a reasonable computation time.