Research On Grid Interaction And Operation Characteristics Evaluation Of Wind Turbine

There is a two-way effect between wind turbine and power grid.Unstable output of the unit will bring deterioration of the quality of the power grid,meanwhile,the occurrence of various transient states of the grid side will especially affect the DFIG.The representation of the interaction of the network is the electrical characteristic parameters including the power quality index.In this paper,the operating characteristics of the wind turbine are analyzed from the electrical characteristic parameters.In the part of theoretical research,DFIG model set on electrical simulation platform PSCAD is used.Using wind speed model improved by considering various dynamic factors,the accuracy of analysis is ensured by the the example analysis with modified model made.On this basis,the causes and related improvement methods of low voltage ride through are sorted out,and then modeling on PSCAD is used to verify the related improvement methods to enhance the low voltage ride through capability;Then,combined with the relevant national standards,the typical harmonic model is studied,and the relationship between output harmonic performance and power is analyzed based on field data,so as to prepare for subsequent evaluation of converter characteristics.On the other hand,the voltage fluctuation and flicker are studied in this paper,and the estimation formula of continuous flicker under the modified wind speed model is given.Based on the actual data calculation,several effective evaluation factors for the smooth characteristic of the unit are excavated.Finally,the fuzzy evaluation is used to complete the related evaluation process,including the performance of the output,convert and smooth characteristics.It is helpful to comprehensively analyze the operating performance of the unit,and supplement the research on the operating characteristics of the unit from a new angle.It is helpful to comprehensively analyze the operating performance of the unit,and supply the research on the operating characteristics of the unit from a new view.