SMES Coordinated with SSSC of an Interconnected Thermal System for Load Frequency Control

The paper presents a new technique for a Load Frequency Control (LFC) of interconnected power systems using Energy storage devices, because additional energy storage capacity is provided as a supplement to the kinetic energy storage in the moving mass of the generator rotor. The energy storage devices share the sudden changes in power requirement in the load. This paper deals with the concept of LFC in two area reheat thermal system considering Superconducting Magnetic Energy Storage (SMES) and Static Synchronous Series Compensator (SSSC). The SSSC located in series with the tie-line between interconnected areas and SMES places in the area-2. The mathematical model of SMES and SSSC is derived from its characteristic of power flow control. The controller of SSSC is designed based on state-feedback control scheme using the techniques of overlapping decompositions and eigenvalues assignment method. Time domain simulations are carried out to study the performance of the power system with SMES and SSSC. The performance of the power system under realistic situation is investigated by including the effects of Generation Rate Constraint (GRC) and governor Dead Band (DB) in the simulation studies.