Full Energy Management of EO-AAC: Toward a Dynamic Equivalence With MMC

Vermeersch, Pierre; Gruson, François; Merlin, Michaël M. C.; Guillaud, Xavier; Egrot, Philippe

doi:10.1109/tpwrd.2021.3050513

Cited by 7 publications

(1 citation statement)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, in the case of severe grid voltage sags, the extreme imbalance of FBSMs will result in a substantial surge in the demand for circulating current [17], which may exceed the maximum current limit of the power switches. To improve the CVB capability, the extended-overlap control with a duration of 60° can be implemented [18], [19], [20]. However, the operation mode of the AAC with extended-overlap control is similar to that of a conventional MMC, leading to extra SMs, abundant DSs, and increased loss [9].…”

Section: Introductionmentioning

confidence: 99%

Capacitor Voltage Balancing Method for the Hybrid Multilevel Converter Considering Grid Voltage Sags

Zhang,

Wang,

et al. 2024

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

Compared to the traditional modular multilevel converter (MMC) and alternative arm converter (AAC), the hybrid multilevel converter (HMC) exhibits superiority in terms of cost and volume. In the HMC, the pulse width of the direction switch (DS) is conventionally utilized to maintain capacitor voltage balancing (CVB). However, this method has certain limitations, including a restricted range of modulation indices and the inability to support pure reactive power operation. To address these drawbacks, a new CVB method based on the phase angle of the DS is proposed in this paper. Compared to the traditional method, the proposed method enables the HMC to achieve a full range of modulation index and four-quadrant operation. Additionally, it demonstrates improved performance in terms of SM capacitance and capacitor voltage ripple, especially under severe grid voltage sags and low power factors. A comparative analysis is conducted between two CVB methods, focusing on the SM number, switch number, and SM capacitance. Furthermore, a unified control strategy considering asymmetrical and symmetrical grid voltage sags is proposed for these two CVB methods. Finally, the effectiveness and superiority of the proposed CVB methods are verified by simulation and experimental testing.

show abstract