Abstract
Aiming at the high-frequency resonance (HFR) and low-frequency oscillation (LFO) phenomena in high-speed railways, a comprehensive suppression method named voltage constant transient active oscillation compensation (VCT-AOC) is proposed. This method is optimized on the basis of AOC, and the adjustment time is shortened by the VCT suppression measure. When serious HFR happens, the system can be quickly restored and stabilized by completely removing the network voltage oscillation in the control part, thereby avoiding the transient overvoltage and overcurrent damage to the system. According to the characteristics of AOC and VCT, the VCT-AOC comprehensive suppression method is proposed, and the specific implementation scheme of this method is given. This paper established the train-network impedance model with AOC and VCT suppression methods. The Generalized Nyquist Analysis (GNA) method and the dominant pole analysis method are used to analyze the effect of VCT and AOC on the system. Finally, the effectiveness of suppression methods is verified by simulations and experiments.
Highlights
With the rapid development of electrified railways around the world, railway safety operations are getting more and more attention, especially in the train-network (‘‘train-traction network’’, which is referred to as ‘‘train-network’’)
VOLUME 7, 2019 characteristics of VCT and active oscillation compensation (AOC), this paper further proposes the voltage constant transient active oscillation compensation (VCT-AOC) comprehensive suppression method, which fully considers the type and degree of train-network coupling instability, and targeted rapid protection of the system
The VCT-AOC method is a further optimization of AOC suppression method
Summary
With the rapid development of electrified railways around the world, railway safety operations are getting more and more attention, especially in the train-network (‘‘train-traction network’’, which is referred to as ‘‘train-network’’). Aiming at HFR and LFO phenomena, the VCT suppression method is proposed from the perspective of the network-side converter control strategy in this paper. VOLUME 7, 2019 characteristics of VCT and AOC, this paper further proposes the VCT-AOC comprehensive suppression method, which fully considers the type and degree of train-network coupling instability, and targeted rapid protection of the system.
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