Experimental studies on diagnosis of operating conditions of power system by use of SMES in Power System Simulator

A new application of SMES (superconducting magnet energy storage) for diagnosis of power systems was proposed. SMES is used for measuring and estimating operating conditions of power systems. SMES can generate the continuous power disturbances of arbitrary patterns to power systems without changing power system operating conditions. The small power oscillations in the power system due to the power disturbances are observed and analyzed to estimate the power system operating conditions. The availability of the proposed method for measuring natural frequencies in a multi-machine power system has been being investigated. In this paper, basic experiments for measuring natural frequencies of the 5-machine longitudinal power system by use of SMES are described. The experiments are carried out using Power System Simulator and a model SMES which was designed and made for the simulator. A few major natural frequencies of the system are measured by the proposed method. The availability of the proposed method is discussed using experimental results.