Studies on SMES Power Oscillation for Measurement of Natural Frequency of Power Systems

Abstract

It is important to power system designers and operators to grasp conditions of a power system operated. In order to grasp the power system condition, the new method using a Superconducting Magnetic Energy Storage (SMES) has been proposed. This method is one of new usage of SMES. Since SMES is a controllable power source with quick response, it can give a power disturbances for power systems with arbitrary patterns. The transient response occurred by the SMES power disturbance is analyzed by FFT. From the peak of the power spectrum, the natural frequency of the power system is pointed out.
In the conventional method for diagnosis of the power system by SMES, the power disturbance is a continuous sinusoidal oscillation. In this paper, we propose to use the one-period sinusoidal wave as the power disturbance. This method is superior because its analyzed data almost comes from the natural oscillation and the disturbance periodicity is not appeared in the analyzed power spectrum. In this paper, we make clear that the natural frequency of power systems can be measured by use of the proposed one-period sinusoidal SMES oscillation.