Analysis on Surge Characteristics and Protection for Wind Turbines Based on ATP-EMTP Simulation

The surge generated by lightning strike blade will impact the electrical system of wind turbine. When the traditional voltage limiting surge protective device (SPD) is used in PWM wave instability and long cable effect, the frequent repeated temporary overvoltage will lead to the phenomenon of sharp reduction in the life of SPD. Therefore, the MW wind turbine is used as the simulation model to analyze the expected surge characteristics at the converter position of the fan electrical system under the condition of lightning strike fan blade. Based on ATP-EMTP simulation, the operation characteristics of the traditional voltage limited SPD selection scheme and the optimized selection scheme under the condition of harmonic oscillation are verified and compared. It is proved that the optimized scheme is feasible to realize fine protection and high tolerance in the case of repetitive transient.