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Dynamic Interactions and Stabilization of Flexible Multi-Terminal Medium-Voltage DC Grid for EV Charging Stations and PV Generation Integration
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DOI：10.1109/TSG.2026.3666381.png)
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Abstract
En 中文
Multi-terminal medium-voltage dc (MVDC) grids are emerging as a promising solution for effectively integrating renewable energy resources and supplying the growing demand for dc loads, such as EV charging stations (EVCSs). However, ensuring their stable operation under varying operating conditions remains a significant challenge. This paper addresses the stability and dynamic interactions of a typical MVDC grid integrating EVCSs and PV generation via dual-active-bridge converters, an ac grid via a voltage-source converter (VSC), and a power flow controller (PFC). Using a comprehensive linearized state-space model, eigenvalue and frequency response analyses reveal that the MVDC system stability is jeopardized during the discharging operation of EVCSs, in the presence of the power feedforward compensation loop in the dc voltage controller of the VSC; such stability challenges become more pronounced in weak ac grid connections. A novel active damping controller integrated with the PFC control strategy is proposed to stabilize the MVDC system, extending the PFC capabilities to offer system-level damping in addition to power flow management. Offline and real-time simulation studies confirm the analytical findings and validate the stabilization efficacy of the proposed compensator.
Keywords:
Multi-terminal medium-voltage DC grids
EV charging stations
power flow controller
VSC-MVDC grid dynamic interactions
active damping controller
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