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Performance analysis of MVAC and MVDC offshore wind farm distribution system using direct load flow method

Popularity of the offshore wind farms in recent years has been increased because the wind resource in offshore is higher with uniform wind speed and availability of large sea area. Most of the offshore wind farms have MVAC (Medium voltage Alternating Current) distribution system. In this paper MVDC (Medium Voltage Direct Current) distribution system is proposed and the performance of this is compared with its equivalent MVAC distribution system. To evaluate performance of any radial connected distribution system load flow solution is essential. For that the conventional methods like Newton-Raphson and Fast Decoupled load flow methods fails to meet the requirements in both performance and robustness aspects in radial offshore distribution system due to its weak meshed structure and extremely large number of branches and nodes. In this paper direct load flow method is used which directly solves load flow of offshore wind farm distribution system using KVL and KCL. The advantage of this algorithm is that it can be used with any type of variable speed generators. Further to validate computer simulations are carried out for 80 MW MVAC and MVDC based wind farm distribution systems independently using MATLAB.