New robust resonant current controller design for grid‑tied inverters with LLCL filters

Djordje M. Stojić; Tomislav B. Šekara

New robust resonant current controller design for grid‑tied inverters with LLCL filters

Djordje M. Stojić

Tomislav B. Šekara

Vol. 25, No. 10, pp. 1930-1941, Oct. 2025

10.1007/s43236-025-01005-5

Digital resonant current controller

LLCL-filtered grid-tied inverter

Pole placement

Reference response forming

Robust Design

Abstract

In this paper, a new method for designing resonant current controllers for grid-tied inverters with LLCL filters is proposed, using the pole placement technique under the complementary sensitivity function maximum and the sensitivity function maximum robustness performance criteria. The primary motivation behind this work is to address the research gap in the design of the current controllers for grid-tied power converters equipped with LLCL filters. The secondary motivation for this work is to replace the commonly used frequency domain techniques in the design of LLCL filter-based power converter current controllers with time domain techniques based on pole placement. The proposed method is more flexible than traditional frequency domain techniques, which generally rely on additional LLCL filter capacitor current measurement. The new method can be used to achieve a wider range of performance objectives since all of the closed-loop system poles can be assigned to any designated value, which is not the case in frequency domain-based techniques. It also improves the control system reference response with the use of a corresponding reference filter. Additionally, the pole map of the control system is determined using conventional robust performance indices, which ensures that the control system is robust to changes in process dynamics. The proposed method is validated by simulation and experimental tests, and the obtained results show that it is effective in achieving the desired performance.

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Cite this article

[IEEE Style]

D. M. Stojić and T. B. Šekara, "New robust resonant current controller design for grid‑tied inverters with LLCL filters," Journal of Power Electronics, vol. 25, no. 10, pp. 1930-1941, 2025. DOI: 10.1007/s43236-025-01005-5.

[ACM Style]

Djordje M. Stojić and Tomislav B. Šekara. 2025. New robust resonant current controller design for grid‑tied inverters with LLCL filters. Journal of Power Electronics, 25, 10, (2025), 1930-1941. DOI: 10.1007/s43236-025-01005-5.