Research On Direct-lightning Overvoltage And Protection Of Wind Farm Based On EMTP/ATP

Wind power, as one of the world’s most widely used clean energy, has attractedthe attention of more and more researchers．The accident by lightning stroke is one ofthe main reasons to affect the normal operation of wind farm．Therefore, thesimulation of the lightning transient effect in the wind farm is of important．To masterthe distribution and variation of transient voltage and current through the analysis ofaccident by lightning stroke．According to the simulation results, put forward thereasonable scheme of lightning protection．Reduce the lightning damage rate ofequipment in wind farm．Improve the safety and reliability of operation and provide areliable basis for the design of lightning protection of wind farm．According to the transient characteristics of the equipment in wind farm duringlightning impact in this article, establish the simulation model of the blade, windtower, transmission line and step-up transformer by EMTP/ATP．According to thelightning accident of transmission line in a wind farm, build the simulation model forthe analysis of the fault condition．Among them, the model of flash and the inducedovervoltage are introduced in detail．Through the discussion of the different schemeof lightning protection, put forward the effective reform measures．When thelightning stroke the wind turbine, dividing the wind tower in grid to create athree-dimensional mesh model，calculate the lightning current and overvoltageappearing in each conductor and grasp the current and voltage distribution to establishthe foundation for the analysis of transient electromagnetic field in the tower．Finally,the impact characteristics of lightning grounding system is analyzed to provide thereference of grounding design．...