An experimental consideration of SMES usage considering loss at energy conversion

Abstract

Superconducting Magnetic Energy Storage system, SMES, is considered to be useful in electrical power systems because of high efficiency and quick response. So, there have been two types of SMES researches, one aims at large scale SMES for nighttime energy storage and daytime power supply, and the other aims at medium or small scale SMES for multi-purpose usage in power systems such as compensation for impulsive loads and system stabilization for disturbances. For both of these applications, the efficiency of SMES considering thyristor loss at energy conversion will be important in order to use it in utility power systems.
In this paper, the results of experiments using a 1 MJ SMES system connected to a miniature power system model for measuring its efficiency between charging and discharging are presented and a consideration for the design and the operation of SMES is proposed after calculating mathematical model of several kinds of SMES derived from this experimental results.