Dynamic impact analysis of DFIG‐based wind turbine generators on low‐frequency oscillations in power system

The increasing integration of wind turbines mainly doubly fed induction generators (DFIGs) introduces dynamic interaction with the conventional synchronous generators (SGs) affecting the damping of low‐frequency electromechanical oscillations (LFEOs) in the system. This study presents a complete impact analysis of DFIG integration on system damping. The damping ratio sensitivity to inertia is used to evaluate the impact of DFIG integration on the critical modes. This study identifies that the impact could be positive or negative based on the location of DFIG. The results obtained are verified by detailed eigenvalue analysis and time‐domain simulations for different operating conditions with three‐phase fault. The negative impact on damping is improved by optimally tuned power oscillation dampers (PODs) with input signals obtained from the phasor measurement units. The impact on dynamic performance of the system due to removal of SGs and addition of DFIGs is investigated. The DFIG penetration is increased on the basis of participation of SGs in critical modes and the results of sensitivity analysis. The proposed approach is tested on standard IEEE 39‐bus test system. The investigations carried out in this work can be employed for planning studies of power system integrated with DFIG for identifying their suitable locations and improving LFEO damping with their high penetration.