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– This paper presents the methodology for optimal design of power grid for offshore wind power plant (OWPP) and optimum location of offshore substation. The proposed optimization process is based on a genetic algorithm, where the objective cost model is composed of investment, power loss, repair, and reliability cost using the net present value during the whole OWPP life cycle. A probability wind power output is modeled to reflect the characteristics of a wind power plant that produces electricity through wind and to calculate the reliability cost called expected energy not supplied. The main objective is to find the minimum cost for grid connection topology by submarine cables which cannot cross each other. Cable crossing was set as a constraint in the optimization algorithm of grid topology of the wind power plant. On the basis of this method, a case study is conducted to validate the model by simulating a 100-MW OWF.Key Words : GA optimization, Probabilistic wind power model, Offshore su bstation, Offshore wind power grid, Submarine cable crossing†Corresponding Author : School of Electrical Engineering, Soongsil University, KoreaE-mail : jckim@ssu.ac.kr* School of Electrical Engineering, Soongsil University Korea** KEPCO Research Institute, KoreaReceived : June 9, 2915; Accepted : June 25, 2015

Optimal Design of Power Grid and Location of Offshore Substation for Offshore Wind Power Plant