Dynamic response of a Skystream wind turbine to a wind gust

Abstract

A detailed electrical model of a Skystream wind turbine system equipped with a permanent magnet synchronous generator, diode rectifier, boost dc to dc converter and inverter is presented and a simulink model of the system is constructed. The model was simulated using the power system simulation tool in MatLab SIMULINK. The simulation of the system is implemented by using step change and linear change input to the wind turbine with an initial wind speed value of 4 m/s and to a final value of 15 m/s. In a step change, it is observed that the output load current increases quickly from 5.2 to 18.3 Amperes in just 0.12 second while in a linear change wind speed input, it is observed that the load output current linearly increases from 5 to 18 Amperes in 0.5 second. Its voltage output approximately remains constant at any change of wind speed. It is found out that there is a small time delay (around 0.2 second) in the response of the load current. The system current output has no unwarranted overshoot or spike even though there is a sudden increase of wind speed. This indicates that it has a stable output current even though a wind gust occurs. Hence, this shows that experimental observations validate the results of the simulation.