Small signal stability analysis of PMSG based WECS with coordinated controller tuning

Small signal stability analysis is very much essential to find stability conditions of a power system due to lack of damping torque when small disturbances are applied. This work is intended to find the effect of wind energy conversion system (WECS) on small signal stability conditions of conventional power system with PMSG based WECS for a SMIB system. The direct drive permanent magnet synchronous generator is considered in the analysis, and the small signal model is derived to assess the small disturbance stability. The eigenvalue analysis investigates the dynamic behaviour of power system under different modes. Therefore, by using eigenvalue analysis, the relation between the modes and the state variables are obtained. By varying the controller parameters, their influence on the eigenvalues are studied. The results show that the system stability can taband grid side converter controller parameters.