Construction Scheme And Simulation Research Of Hybrid Wind And Tidal Current Power Generation System

With the increasing energy demand and environmental pollution,The development of renewable energy has become a research hotspot.Energy reserves of ocean are enormous,and its efficient use is very helpful to solve energy and environment problems.The research on offshore wind power generation system developed rapidly under the influence of onshore wind power,and the development of tidal current generation system also has showed great potential.Offshore wind and tidal current are geographically close,and they are complementary on a long time scale.Also,offshore wind power which is volatile and random can be compensated by tidal current power which is stable and predictable.So hybrid wind and tidal current power generation system can improve energy utilization rate and power supply reliability.Construction scheme of hybrid wind and tidal current power generation system was studied in this paper.First,modeling for all system units was done.Then networking mode based on DC bus was selected.Finally,the pile pillar foundation platform of the system was introduced.Capacity allocation optimization of hybrid offshore wind and tidal current power generation system in Zhou Shan was accomplished by HOMER.Reasonable configuration of the wind turbine and tidal turbine can be acquired through analysis of the evaluation indexes of the system.Sensitivity analysis illustrates the applicability of offshore wind power generation system,tidal current power generation system and hybrid offshore wind and tidal current power generation system for area of different wind and tidal current speed,which provides design basis for capacity configuration of real system.The permanent magnet synchronous generator and the grid side converter of the system are modeled.The generator and the grid side converter control strategies were researched.isd=0 control strategy was adopt for the generator control,grid voltage orientation control strategy was adopt for the grid side converter,and the optimum tip-speed ratio method was adopt to achieve the maximum power point tracking for wind turbines.In response to the power fluctuations of wind turbines,tidal current power compensates for wind power to reduce the volatility of system output power.Considering the power generation efficiency of the tidal current generation system,the tidal base value coefficient was defined to distribute the power for compensating and generating.Tidal current generation system fully compensation and no compensation for wind generation system were simulated.The former results illustrate the effectiveness of the compensation strategy;the latter results illustrate the tidal current and wind generation system all achieve the maximum power point tracking by the control strategy.The comparison of simulation results illustrate that setting of tidal base value coefficient is able to meet the demand for the distribution of the tidal current power.Comparison of the two simulation results shows that varying degrees of balance of tidal current power generation efficiency and smooth efficiency can be obtained by set of different tidal base value coefficients.So that the needs of system output can be meet.