2026-08-07T10:56:37.355Z http://zaposleni.etf.bg.ac.rs/rest/sciNaucniRezultati/oai

zaposleni.etf.bg.ac.rs/rest/sciNaucniRezultati/oai:2:709970 2025-07-13T16:15:33Z 2

Single-phase PWM rectifier based on novel applications of LLCL filter and multi-rate cascaded controller for decoupled parameter tuning 2025 http://zaposleni.etf.bg.ac.rs/rest/sciNaucniRezultati/oai/record/2/709970 https://www.sciencedirect.com/science/article/abs/pii/S0378779625005577?via%3Dihub Đ. Stojić T. Šekara T. Tarczewski L. Niewiara The conventional L, LC, and LCL filters employed in grid-tied single-phase PWM rectifiers introduce limitations in terms of filter component values and size, grid-current ripple, and harmonic attenuation. This paper proposes the adoption of an LLCL filter, enabling the utilization of smaller filter components (leading to 30-50 % reductions), reduced grid-current ripple (the LLCL filter provides complete grid-side current ripple attenuation), and enhanced grid-related harmonic attenuation (reduced grid-side current harmonic distortions up to 30 %). Also, THD values below 5 % are attained while maintaining higher efficiency. LLCL-filtered grid-tied converters maintain stable operation even when grid impedance varies by up to 50 %. The grid-current controller was designed with robustness constraints to ensure reliable operation despite variations in grid impedance and operating conditions. The proposed multi-rate cascaded DC bus voltage controller also effectively decouples from the grid-current controller, enabling independent tuning of their parameters and leading to a settling time reduction of up to 50 % and an overshoot reduction of up to 80 %. A notch filter is integrated into the DC bus voltage measurement to eliminate double-line frequency ripple on grid-current harmonics. Simulation and experimental results are presented, which demonstrate the effectiveness of the proposed approach and decoupled grid-current and DC bus voltage control. article 10.1016/j.epsr.2025.111966 248 1 10 0378-7796 ELECTRIC POWER SYSTEMS RESEARCH