MIMO-Identification Techniques in Frequency-Response Measurements of Power-Electronic Systems

Abstract

Switched-mode converters play a significant role in modern society. Their operation are often crucial in various electrical applications affecting the every day life. Therefore, the quality of the converters needs to be reliably verified. Recent studies shows that the converters can be fully characterized by a set of frequency responses which can be efficiently used to validate the proper operation of the converters. Consequently, several methods have been proposed to measure the frequency responses fast and accurately. This paper extends those methods and proposes the use of multiple-input multiple-output (MIMO)-identification techniques. Compared to the conventional methods, where a system is analyzed through single-input experiments, the proposed techniques provide several advantages such as shorter experiment time. The method requires a set of uncorrelated excitation sequences having strictly defined auto-correlation properties.