Magnetic Integrated Multi-Trap Filters Using Mutual Inductance to Mitigate Current Harmonics in Grid-Connected Power Electronics Converters

Maged Al-Barashi, Aicheng Zou (), Yongjun Wang, Wei Luo, Nan Shao, Zeyu Tang and Bing Lu
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Maged Al-Barashi: School of Aeronautics and Astronautics, Guilin University of Aerospace Technology, Guilin 541004, China
Aicheng Zou: School of Aeronautics and Astronautics, Guilin University of Aerospace Technology, Guilin 541004, China
Yongjun Wang: School of Aeronautics and Astronautics, Guilin University of Aerospace Technology, Guilin 541004, China
Wei Luo: School of Aeronautics and Astronautics, Guilin University of Aerospace Technology, Guilin 541004, China
Nan Shao: School of Aeronautics and Astronautics, Guilin University of Aerospace Technology, Guilin 541004, China
Zeyu Tang: School of Aeronautics and Astronautics, Guilin University of Aerospace Technology, Guilin 541004, China
Bing Lu: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611700, China

Energies, 2025, vol. 18, issue 2, 1-32

Abstract: This paper introduces magnetic integrated high-order trap–trap–inductor ( TTL ) and inductor–trap–trap ( LTT ) filters featuring two LC -traps designed for grid-tied inverters, aimed at reducing the size of output-power multi-trap filters. The proposed filters exhibit excellent harmonic absorption capabilities alongside a compact design. Building on the conventional integrated inductor–capacitor–inductor ( LCL ) filter, the approach involves connecting a small capacitor in parallel with either the inverter-side or grid-side inductors to create an LC trap. Additionally, a second LC trap can be achieved by integrating the filter capacitor in series with the equivalent trap inductance, established by the magnetic coupling between the grid-side inductor and inverter-side one. This paper thoroughly analyzes the characteristics of the proposed filters. Moreover, a design method is presented to further minimize the size of the output filter components. Finally, validation through simulations and hardware-in-the-loop (HIL) experiments confirms the proposed approach’s effectiveness and feasibility. The integrated designs achieve a size reduction of 35.4% in comparison with the discrete windings. Moreover, these designed filters comply with IEEE standards, maintaining a grid-side current total harmonic distortion (THD) of less than 0.9%, with all current harmonics below 0.3% of the fundamental current.

Keywords: harmonic distortion; LC -trap passive filters; magnetic integration; multi-trap filters; switching harmonics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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