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Integrating renewables into compact Electric Vehicle charging networks poses challenges like voltage imbalances and power oscillations. A recent study tackled these with a novel control strategy for a three-phase modified switched Z source grid-tied converter. Unlike traditional methods using oversized capacitors, this study employed extra proportional integral (PI) control loops to eliminate negative sequence components. Simulation results showcased the potential of the finite set-model predictive control (FS-MPC) in reducing Direct Current-Link variations from double-frequency ripples. The removal of redundant PI control loops also boosted control unit efficiency. The study introduced an improved modified switched Z source design, refining control logic. The predictive control algorithm effectively mitigated active power oscillations without extensive gain tuning, even with unbalanced grids, ensuring IEEE 519TM-2014 compliance. This research addresses power quality concerns in EV charging infrastructure, offering a practical solution for stable and efficient operations. By adopting the FS-MPC strategy and integrating the modified switched Z source design, the study optimizes power flow and enhances EV charging reliability.
Cite this article as: A. Tiwari and A. Chowdhury, “Finite set-model predictive control for modified switched Z source level 3 off-board charger for active power oscillations damping in weak grids,” Electrica, Published online April 17, 2024. doi:10.5152/electrica.2024.23081.