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In this paper, we propose a planning method for large-scale offshore windfarm (OWF) electrical collector system (ECS) based on mixed integer linearprogramming, in which the sizing and siting of offshore substations and thelines between wind turbines (WTs) are optimized. We found out that the problemis similar to power distribution system planning, where the topologicalconstraints for distribution network expansion planning (DNEP) are applied toguarantee the radiality of ECS topology and accelerate the solving process.Case studies based on an OWF with 63 fixed-locations WTs demonstrate theeffectiveness of proposed method, in which the cost of ECS's investment oncables is reduced by 23%, power loss reduced by 44% compared with aconventional design, and the calculation time reduced with the help of theradiality constraint.

Large-scale Offshore Wind Farm Electrical Collector System Planning: A Mixed-Integer Linear Programming Approach