Erroneous use of the Naslin polynomial method

Erroneous use of the Naslin polynomial method is presented. This is to clarify some common mistakes to watch out for.

Illustration of problems discussed in

B. Ufnalski, M. Michalczuk and A. Galecki, "Robust Tuning of Multiresonant Current Controllers for Grid-Tied Converters and Erroneous Use of the Naslin Polynomial Method," in IEEE Access, vol. 10, pp. 88211-88225, 2022, doi: 10.1109/ACCESS.2022.3199702.

It is an open access paper (https://ieeexplore.ieee.org/document/9861410). Please read it as a prerequisite for playing with this submission.

After debunking some methods reported in the topical literature, a novel approach based on the disk margin analysis and a global optimization algorithm is proposed and verified experimentally.