Harmonic Resonance Evaluation for Hub Traction Substation Consisting of Multiple High-Speed Railways

Abstract

1 -In many hub traction power supply systems (TPSS), the 27.5kV-busbars in the traction substation (TSS) have supplied several railway lines in a local area for reducing the number of TSSs. However, the multiple railway lines connected to the busbar may affect the resonance behaviors of the entire system. It's therefore needed to investigate the resonance behaviors under such hub TPSS conditions since the harmonic current collection of all railway lines will aggravate the resonance problem. Thus, resonance mode assessment and its sensitivity method is adopted for investigating the resonance behaviors of hub TPSS affected by different numbers of connected lines, lengths of supply lines, system capacities, etc. The numerical results of modal sensitivity indices are compared to investigate and quantify the harmonic resonance issue caused by multiple electrical railway lines. In addition, resonance frequency-shift technique and using modal impedance sensitivity index based method are also employed to mitigate the critical harmonic resonances. The results illustrate that it is effective to analyze resonance issues by adopting the harmonic model and modal methods in this paper. The two types of resonance behaviors (i.e. primary resonance and resonance band) caused from the hub TPSS have been fully investigated, and the resulted harmonic distortion of hub TPSS is suppressed.

Impedance-Based Harmonic Instability Assessment in a Multiple Electric Trains and Traction Network Interaction System

“…The ac traction power supply system is widely used in the world, which has 15 kV / 16.67Hz [8], 25kV / 60Hz [26] and 25 kV / 50Hz modes. In addition, the 25 kV traction power system includes the 1×25 kV, (for the directly fed traction network, respect to the conventional railway) [27], and 2×25 kV, (for the AT-fed traction network, respect to the high-speed or overloaded railway), which are mainly used in Korea [26], Italy [28], Europe [29], China [30][31][32], Iran [33] and Zimbabwe [34].…”

Study on the Quantitative Relationship Between Harmonic Amplification and Cable Length

“…HA may result in harmonic exceeding the limit and cause a series of problems, such as serious voltage distortion, equipment mal-operation, interference problems of secondary measurement systems etc. [10]- [12]. HA is bringing new challenges for power electronic-based power systems.…”

Research on the harmonic in new continuous cable traction power supply system and its transmission characteristic

“…Inductive parameter and capacitive parameter maybe match at specific frequencies; this perhaps leads to severe resonance phenomena [14] and results in remarkable harmonic amplification [15] in CTN, obstructing CCTPSS safe operation. Harmonic transmission characteristics and resonance in AT TPSS are relative perfectly studied [16] with the method of frequency scan [17] and modal analysis [18,19] nowadays, by many scholars. However, there is hardly any reference that discusses harmonic transmission and resonance problems of CCTPSS, both in China and overseas.…”

“…Finally, resonance and harmonic transmission characteristics in a cable traction network are detailed studied in simulation under different operation conditions. Analysis results are compared with relevant AT TPSS conclusions [18][19][20][21]. Lay a foundation for the engineering application of CCTPSS.…”