Dynamic contribution of DFIG along with SMES for load frequency control of interconnected restructured power system

In the case of doubly fed induction generator (DFIG), power electronics converter effectively decouples the inertia of the wind turbine generator from the power system. Hence, the increased penetration of DFIG results in higher frequency excursion and increased rate of change of frequency in the event of generation loss or increased load demand. This paper presents the added feature of frequency regulation capability of the DFIG by incorporating an extra frequency control support function, tested on an interconnected two-area restructured power system. The presence of Superconducting Magnetic Energy Storage (SMES) at the terminals of both the areas in addition to dynamic active power support from DFIG results in optimal transient performance after the load perturbations imposed by PoolCo transaction. Integral gains of AGC loop and parameters of SMES are optimized through craziness based particle swarm optimization (CRPSO) in order to have optimal transient responses of area frequencies and tie-line power deviation.