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This paper presents the design of superconducting magnetic energy storage (SMES) controller for improving stabilization of interconnected power system based on synchronized phasor measurement. Load variations with abrupt changes occurring in a power system cause fluctuations of tie-line power flow and significantly disturb the effective use of transmission lines. As one of promising energy storage devices, SMES is applied for power system stabilization. SMES controller is designed based on the wide area synchronized phasor measurement. The estimated model is determined as a coupled vibration model for detection and assessment of an approximated inter-area oscillation mode. Finally, some simulation studies are carried out to demonstrate the applicability and effectiveness of the design method.