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A comprehensive digital computer model of the two-area interconnected power system including the governor deadband non-linearity, steam reheat constraints and the boiler dynamics is developed. The improvement in AGC with the addition of a small capacity Superconducting Magnetic Energy Storage (SMES) unit is studied. Time domain simulations are used to study the performance of the power system and control logic. Optimization of gain parameters and the stability studies are carried out by the second method of Lyapunov. Suitable methods for the control of SMES units are described.

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1 = slope of the input/output curve of governor = quadratic performance index = area index, (1 or 2) = transpose of a matrix = small deviation of a state variable = Laplace operator = d/dt = (d/dt)x

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A discrete state-space model of a twoarea interconnected power system with reheat steam turbine, governor dead band nonlinearity and superconducting magnetic energy storage is developed in this paper. The effect of a smallcapacity superconducting magnetic energy storage (SMES) system is studied in relation to supplying sudden power requirements of real power load. The feasibility of using an IGBT converter instead of a thyristor converter as a power conditioning system with the SMES is studied. Time domain simulation results are also presented which show improvement of transient response with SMES.