Magnetic integrated double-trap filter utilizing the mutual inductance for reducing current harmonics in high-speed railway traction inverters.

Autor: Al-Barashi M; School of Aeronautics and Astronautics, Guilin University of Aerospace Technology, Guilin, 541004, China., Wang Y; School of Aeronautics and Astronautics, Guilin University of Aerospace Technology, Guilin, 541004, China. 286613600@qq.com., Lan B; School of Aeronautics and Astronautics, Guilin University of Aerospace Technology, Guilin, 541004, China., Bhutta MS; School of Automobile Engineering, Guilin University of Aerospace Technology, Guilin, 541004, China.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2024 May 02; Vol. 14 (1), pp. 10058. Date of Electronic Publication: 2024 May 02.
DOI: 10.1038/s41598-024-60877-y
Abstrakt: Current harmonics are generated at the switching frequency and its multiples when the traction converters are modulated. To address this, multi-trap filters are introduced, which are capable of selectively eliminating these specific harmonics to the limits set by IEEE 519-2014. This targeted removal significantly reduces the need for high total inductance, thereby allowing for a more compact filter design. Comparatively, to traditional inductor-capacitor-inductor (LCL) filters, more magnetic cores are needed for trap inductors. Furthermore, the traction systems have not been examined in conjunction with multi-trap filters. To reduce the filter size and investigate its application in traction converters, this paper presents an integrated double-trap LCL (DTLCL) filter. A tiny capacitor is connected in parallel with the grid-side inductor to form one LC-trap. In addition, another LC-trap is formed by connecting the equivalent trap inductor, introduced through the magnetic coupling between inverter-side and grid-side inductors, in series with the filter capacitor. The presented filters' features are thoroughly analyzed, and the design method has been developed. Finally, the simulation and hardware-in-the-loop (HIL) experiment results validate the proposed method's viability and efficacy. Compared to the discrete windings, the integrated ones enable a size decrease of two cores. Furthermore, the proposed filters can meet IEEE 519-2014 criteria with 0.3% for all the current switching harmonics and total harmonic distortion (THD) of 2.36% of the grid-side current.
(© 2024. The Author(s).)
Databáze: MEDLINE
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