The WRHE-PWM Strategy With Minimized THD to Suppress High-Frequency Resonance Instability in Railway Traction Power Supply System

• Published in: IEEE access Vol. 7; pp. 104478 - 104488
• Main Authors: Zhang, Xinyu, Chen, Jie, Zhang, Gang, Qiu, Ruichang, Liu, Zhigang
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Converters; Frequency stability; Harmonic analysis; Harmonics; High speed rail; high-frequency resonance instability; Physical simulation; Power harmonic filters; Power supplies; Pulse duration modulation; Pulse width modulation; Resonance; Resonant frequencies; Resonant frequency; Strategy; suppression method; Switches; Traction; train-network power supply system; WT-PWM modulation strategy
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2019.2930969

Aiming at the high-frequency resonance instability phenomenon in high-speed railways and traction network (simplified as "train-network") system, a new modulation strategy is proposed. It is the windowed resonant harmonic elimination pulse width modulation with minimized THD (WT-PWM). This modulation strategy can not only eliminate the harmonics around the resonant frequency in the train-network system but also combine the THD minimization target to reduce the risk of high-frequency resonance instability to the greatest extent. The modulation strategy can suppress high-frequency harmonics generated by the PWM switches of the network-side converter in a train fundamentally, thereby suppressing the high-frequency resonance instability caused by the train, which is regarded as harmonic sources. Finally, the effectiveness of the WT-PWM strategy is verified by real-time simulation and semi-physical simulation experiments.