Optimization Study Of High Voltage XLPE AC Insulation Submarine Cable For Offshore Wind Farm By LCC

With the development of offshore wind farm in our country, more and more AC high voltage XLPE(Cross Linked Polyethylene) insulation submarine cables are applied to transfer power. High voltage electric power submarine cable project is recognized as one of the most difficult human engineering project, who’s the initial and late investment cost are enormous, hence, it should be careful before make a choice about submarine cable.The article combines with feature of high voltage XLPE insulation submarine cable used in offshore wind farm, distinguishes conventional electrical equipment, establishes the model of high voltage submarine cable life cycle cost which includes CI(cost of input)、CLA(cost of laying)、CLE(cost of electricity loss)、CF(cost of failure)、CM(cost of maintenance)、 CF(cost of failure)and CD(cost of disposal), achieve the aim of optimization for submarine cable layout and submarine cable selection, on condition that submarine cable transmission scheme capacity meet the constraint of the offshore wind farm external capacity, and the minimum life cycle cost CNAV(Net Annual Value)is best of all submarine cable planning. Specific work is as follows: the related influencing factors of offshore wind farm high voltage submarine cables are analyzed, and then submarine cable CLE calculation model is build on the premise that IEC60287 standard is adopted to calculate conductor loss、dielectric loss、current-circulation loss and eddy-current loss; the high voltage XLPE insulation submarine cable failure tree is build and simplified by FTA(failure tree analysis), and cut set incident are selective analysis about the influence of submarine cable ontology failure rate; markov repairable system is used on establishing CF model, taking advantage of handling different failure states; the maintenance difference between onshore submarine and offshore submarine is analyzed, and then CM calculation model is build; the related factors analysis diagrams are draw, and after that CI、CLA and CD calculation model are established.Base on the above work, “submarine cable life cycle cost valuation and analysis system” is build use the C++ programming language, and it firstly applied to one of the Chinese offshore wind farm landed in the Nanhai Sea. The system calculates CNAV of all plans under constraint condition, and the system shows that two-circuit 3×500mm2 high voltage XLPE insulation AC submarine cable was the best of four plans.