Research On Reactive Power Control Strategy Of Wind Farm Cluster With Multi-source Coordination

In recent years,with the rapid development of technology and renewable energy technologies,wind power installed capacity and penetration rate have been expanding.Due to the randomness and volatility of wind,impact of large-scale wind farm cluster on the grid is becoming more and more significant.Output Fluctuation of the wind farm cluster cause voltage fluctuation of grid,It makes the reactive equipment switch frequently.Chinese wind power has the characteristics of high-voltage and long-distance transmission,which exacerbates volatility and instability of voltage operation for wind farm cluster connected to the power grid.Traditional wind farm cluster reactive voltage regulation can't meet system's stability requirement,it is urgent to coordinate and cooperation to participate in reactive power voltage regulation.Therefore,it is very important to study reactive voltage control strategy for wind farm cluster connection to grid and coordinate reactive power voltage control strategy between wind power and conventional power plants.Thesis first analyzes the typical topology of wind farm cluster as well as reactive voltage characteristics of wind farm cluster access points.According to the wind farm clusters in the thesis,wind farm equivalent method is proposed based on flow and sensitivity consistency.The equivalent ground-to-ground branch is corrected by sensitivity weighting method.Secondly,the reactive power control of wind farm cluster and reactive power coordination control strategy of wind power together other conventional power sources are studied.The basic idea of reactive power voltage coordination control is proposed based on multi-source wind farm cluster,according to real-time data,reactive voltage control command issued by the superior scheduling,comprehensive consideration coordination between wind power and conventional power such as hydropower?thermal power,increase the bus voltage of wind farm cluster collection substation access point through reactive power control,allow it is controlled within a safe reasonable range.Finally,voltage stability problem of wind farm local control is studied under three-phase symmetrical fault conditions.In chapter 4,a reactive power adaptive control strategy is proposed for a wind-storage joint system based on neurons.The voltage of wind storage joint system common coupling point is the input of the controller.Using the Hebb learning algorithm as an adaptive law,to obtain accurate reactive compensation,to improve system voltage stability and wind power ride-through capability under grid faults.