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This paper presents a voltage sag compensator (VSC) integrated with superconducting magnetic energy storage (SMES) device. Performance evaluations of the SMES-based VSC for the initial and steady voltage sag compensations in sensitive load are carried out in details. Effects of the time delay in discharge response and initial voltage sag angle on the initial voltage sag compensation are discussed to clarify the transient SMES property. In addition, three definitions for the voltage sag compensation time duration are introduced to evaluate the steady SMES property for short-time and long-time voltage sag compensation operations. Index Terms-power quality, voltage sag compensator, sensitive load, superconducting magnetic energy storage (SMES).

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