Impedance Specification and Stability Analysis for the AC Grid-Converter System in Modified Sequence-Domain

Zhou, Yi; Hu, Haitao; Pan, Pengyu; He, Zhengyou

doi:10.1016/j.ifacol.2019.08.177

Cited by 2 publications

(1 citation statement)

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“…In summary, in the modified-sequence domain, the system can be approximately decoupled as two single input and single output (SISO) systems, which is convenient for revealing the impedance interaction mechanism and maintains the accuracy. It should also be noted that although the impacts of the nondiagonal elements on the stability analysis in the modified sequence domain are slight, neglecting the non-diagonal elements of the impedance ratio matrix in modified sequence domain could cause an optimistic stability analysis result in some critical cases [54]. This article has been accepted for publication in a future issue of this journal, but has not been fully edited.…”

Section: Mechanism and Influential Factors Of Lfomentioning

confidence: 99%

Low-Frequency Oscillation in Electric Railway Depot: A Comprehensive Review

Zhou

et al. 2021

IEEE Trans. Power Electron.

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The wide adoption of a new type of electric trains results in multiple frequency-scale instability problems, such as low-frequency oscillation (LFO), harmonic resonance and harmonic instability. Among them, LFO has been commonly reported at electric railway depots with multiple-energized electric trains around the whole world, thus attracting widespread research attention. LFOs cause adverse effects on the system stability and protection infrastructure of both the traction network and electric trains. This paper presents a comprehensive review of LFOs that consider both academic theoretical analysis and industrial engineering requirements. A unified mathematical model of the traction network and electric train is derived with a view to revealing the mechanism and factors that induce LFOs when these two systems interact. The study also draws deep insights from results of experimental measurements and industrial mitigation schemes already implemented in Chinese railway systems. A variety of mitigation techniques and recommendations based on theoretical principles and practical constraints are presented.

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Section: Mechanism and Influential Factors Of Lfomentioning

confidence: 99%