Research On Reliability Assessment Of Collection System For Offshore Wind Farm Considering Wind Speed

The government and public have paid more attention to the increasing consumption of traditional fossil energy and the environmental pollution caused by it.It is extremely urgent to develop new alternative clean energy.As a kind of clean and mature energy,the exploitation and utilization of wind energy have been paid more attention.China's offshore wind energy resources are abundant and the exploitation of it is less restricted than that of onshore wind power.Therefore,offshore wind energy has been a hot research over the past ten years.As an important part of offshore wind farms,the maintenance cost and difficulty of the collection system are high.Therefore,the research on the reliability of the offshore wind farm collector system can improve the reliability of the offshore wind farm and improve its economy to some degree.This paper first analyzes the impact of the internal structure configuration of the collection system on its reliability.Based on the influence of wind turbine faults,topology types and switch configuration schemes,the reliability index of the collection system is evaluated.By using the topological block method and the enumeration method,the reliability probability model under various states of the collection system is established,and then the reliability index of the collection system under four different internal topology types and two different switch configurations is obtained and analyzed after comparison.Based on the influence of the internal components of the collection system,this paper also analyzes the influence of wind speed on the output power of the collection system.Wind energy is an important external influence factor in offshore wind farms.Wind speed has different effects on the power generation of a single wind turbine.At the same time,wind speed will cause wake effect between the wind turbines under the existing layout of the wind turbines in the collection system.And then the wake effect will affect the power generation efficiency.In this paper,the wind turbine power output model and wind speed Weibull model are used to evaluate the influence of wind speed on its reliability under the premise of the influence of internal factors on the current collection system.The research in this paper can provide some reference and suggestions for the design and plan of offshore wind farms in selection of topology design,switch configuration scheme and wind turbine types.