A Super-Twisting-Like Sliding Mode Observer for Frequency Reconstruction in Power Systems: Discussion and Real Data Based Assessment

Abstract

This paper deals with data-based assessment of a recently proposed super-twisting-like sliding mode observer for frequency estimation and reconstruction in power systems, and the earlier observer further develops in this paper. We make use of both the historical measurement data of frequency and information about faults which have taken place in the last few years in the Nordic Power System. We compare the real frequency measured values with the ones estimated by using the proposed super-twisting-like sliding mode observer. The comparison shows the high accuracy of the estimation scheme, especially during the first seconds immediately after the faults. This analysis confirms the validity of the proposed observer.