Enhancement of low voltage ride through capability of DFIG used in wind power applications

Now a day´s wind power technology is the most popular renewable energy sources compared with the other types. Doubly fed induction generator is the more suitable type of generator for this application due to its superior controlling characteristics. But most of the times it suffers from the low voltage ride through as its stator and rotor are connected to the grid. At the time of voltage dip, a transient current appears on the rotor converter which may damage the rotor side converter. The grid code suggests that these wind power plants should remain connected to the grid under such circumstances and contribute the fault current safely. But it is difficult to satisfy for DFIG connected wind plants. Hence this paper presents a technique to control the rotor current by an analytical method. The results are validated through the simulation in Matlab.