Stability Analysis of Vehicle-Grid Interaction Systems
Summary
Vehicle-grid interaction systems encompass the dynamic coupling between electrified vehicles—such as electric multiple units in railway networks or battery electric vehicles—and the electrical grid to which they connect. Stability analysis in these systems addresses the risk of undesirable oscillations and resonance phenomena arising from the interplay of power electronic converters, grid impedance and control strategies. Central challenges include low-frequency oscillations (LFOs) that can lead to voltage or current instabilities, as well as harmonic resonances that compromise power quality. To predict and mitigate such issues, researchers employ impedance-based modelling, modal analysis and frequency-domain criteria, supplemented by time-domain simulation and hardware-in-the-loop testing. Control-oriented frameworks leverage rotating dq-coordinate transformations, passivity conditions and robust control laws—such as H∞ or sliding-mode schemes—to shape system dynamics. Insights from these analyses inform the design of converter controllers, selection of network parameters and integration of energy storage devices, supporting the reliable expansion of electrified mobility infrastructures worldwide.
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Stability Analysis of Vehicle-Grid Interaction Systems publication trend
The graph below shows the total number of articles in stability analysis of vehicle-grid interaction systems across all publications each year (not limited to Nature Index journals).
Technical terms
Low-frequency oscillation (LFO): Undesired slow oscillatory interaction between a vehicle’s power electronics and the grid, often leading to voltage or current instability.
Impedance model: Mathematical representation of the frequency-dependent opposition of a system to alternating current, used to assess stability through admittance or impedance ratios.
Bode diagram: Plot of magnitude and phase of a system’s transfer function across frequencies, employed to evaluate stability margins.
dq-coordinate frame: Rotating reference frame converting three-phase quantities into direct (d) and quadrature (q) components to simplify dynamic analysis and control design.
Passivity-based control: Control strategy ensuring that the system’s input–output energy exchange remains non-increasing, thereby promoting stability.
References
- Low-frequency oscillation of train–network system considering traction power supply mode. Railway Engineering Science (2024).
- Low Frequency Stability of AC Railway Traction Power Systems: Analysis of the Influence of Traction Unit Parameters. Electronics (2022).
- A New Low-Frequency Oscillation Suppression Method Based on EMU On-Board Energy Storage Device. IEEE Access (2021).
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