Open AccessResonant frequency identification based on harmonic injection measuring method for traction power supply systems
Author(s) -
Qiujiang Liu,
Mingli Wu,
Junqi Zhang,
Kejian Song,
Liran Wu
Publication year - 2018
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2017.0122
Subject(s) - harmonic , traction (geology) , harmonic analysis , resonance (particle physics) , amplitude , power (physics) , electronic engineering , control theory (sociology) , computer science , engineering , physics , acoustics , control (management) , mechanical engineering , quantum mechanics , particle physics , artificial intelligence
Accidents related with high‐order harmonic resonance seriously threaten the safety and stable operation of traction power supply systems (TPSSs). Generally, the resonant frequency of a TPSS, which is the crucial information for resonance suppression, cannot be accurately obtained through model‐based methods due to the TPSS complexity. This study proposes a direct measuring method that harmonic currents at different frequencies and amplitudes are injected into the TPSS by a harmonic generator (HG). Then, the resonant frequency can be identified by measuring the harmonic response. The HG based on a single‐phase cascaded H‐bridge converter and its control algorithms are developed. Both simulations on a railway system model and experimental results on an equivalent resonant circuit are carried out to validate the feasibility and effectiveness of the proposed method.