Reliability Evaluation for a Grid Connected Offshore Wind Farm

Through Markov chain and sequential Monte Carlo simulation methods, the reliability model and indexes of the grid connected offshore wind farm, from wind turbines to collection system, collection bus and VSC-HVDC transmission system, are obtained, in which the influence of severe weather, switch configuration of power collection system and different spare strategies of VSC-HVDC are considered. The case study shows that the normal/severe dual weather mode is more conducive to accurately depict the reliability characteristics of offshore wind power system. Meanwhile, the reliability of maximum switch configuration is higher than that of minimum switch configuration. In addition, the cold spare can effectively improve the energy utilization rate and the hot spare can effectively reduce the failure rate of VSC-HVDC system.