Mitigation of output power fluctuations in wind farms with Opti-slip induction generator

This paper presents an elegant technique for mitigating the output power fluctuations from a grid connected Opti-slip induction generator (OSIG), due to sudden wind gusts leading to input drive torque variations. The proposed technique has also been extended to control the amount of real power into the grid at the desired value. The control of OSIG is achieved using the basic principles of chopper control for varying the rotor resistance. The proposed control scheme has been simulated and tested in PSCAD/EMTDC. The performance of the control scheme is further validated experimentally. The results obtained both in simulation and experimentation are discussed in detail.