Modelling and analysis of a voltage regulator for a large capacity DFIG wind turbine to achieve low voltage ride through

2017 International Journal of Recent Trends in Engineering and Research  
Due to the high distress on the environmental pollution and energy shortage from the last couple of decades, the renewable energies has been of much interest and to be specific the wind power has been developed to a very great extent in last few years. This paper proposes a simple technique to achieve low voltage ride through of DFIG based power generating station. A thyristor controlled voltage regulator (TCVR) on the low voltage side of the DFIG is used to compensate the grid voltage if
more » ... e sag occurs and hence reducing the rise in DC link voltage and also effectively reduces the rotor current under limit during the fault. The simulation work will be carried out using MATLAB/Simulink software and the results will be verified. Keywords-doubly-fed induction generator, thyristor controlled voltage regulator, low voltage ridethrough I. INTRODUCTION Amongst the different renewable energies, wind power has been developed rapidly and will play a major role in the future. The most widely used generating principle in wind turbines are the Double Fed Induction Generator (DFIG). The large wind farms use the DFIG wind turbine because of its favorable conditions such as low cost, simple structure, operates on variable speed, having the control capabilities of active and reactive power (partial control), reduced converter cost, reduced power losses, efficiency of the DFIG is very good and many more such advantages in wind power applications over a conventional induction machine. The occurrence of faults in the power system results in the voltage dip (sag) at the WT terminals. Due to this voltage dip, surge currents in stator windings and surge currents in the rotor windings are initiated. As a result of this, a DC voltage ripple is generated at the DC bus due to the imbalanced power flow from the RSC TO GSC. Hence proper protection equipment must be installed to take care of the surge currents and the DC voltage ripple, in the absence of protection equipment the RSC and DC link capacitor will be damaged or exploded.
doi:10.23883/ijrter.2017.3280.bxqh8 fatcat:xb5tb5rehfannoyyxw7xzbpxlu