Real-Time Simulation of Wind Turbine Driven Grid-Connected Induction Generator on DSP Platform

Induction generator based wind turbines are increasingly being integrated to power system networks. Power converters required for the integration can be tested using power hardware in loop simulation and power electronic based emulation. Real-time simulation constitutes an important part of these testing methods. This paper presents the real-time simulation of a mechanically-coupled wind turbine and squirrel cage induction generator system connected to the grid. Dynamic models of wind turbine and induction machine are detailed. The responses obtained using real-time and off-line simulations based on these models are presented. The same are benchmarked against the responses obtained through MATLAB simulink library blocks for cases pertaining to the start-up transients when the system is connected to the grid, and the transients resulting from a grid fault. Close agreement among the three sets of responses validates the mathematical model as well as the real-time simulation of the system. The real-time simulation is performed on a digital signal processor which is much more cost effective solution than a commercial simulator. Low execution time observed affirms the suitability of the DSP as a real-time simulator.