Per-Phase Active Power Distribution Strategy for Three-Phase Grid-Tied Inverters Under Unbalanced Conditions Without DC Sources

Tsai, Terng-Wei; Li, Yi-Chan; Yang, Cheng-Jhen; Chen, Yaow-Ming

doi:10.1109/jestpe.2021.3064331

Cited by 4 publications

(1 citation statement)

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“…where the load step is indicated with P, T r is the period during which the capacitors have to provide the load step power, which depends on the VSC control delay and it is usually selected as 5-10 modulation periods, and V dc is the allowed voltage deviation. This design consideration is important for the BESSs' VSC since grid-connected BESS are required to provide fast load steps, but also because of the grid connection standards which require fault tolerance and LV ride through [26], [27]. This equation estimates the energy that needs to be supplied from the dc-link in case of an unexpected load step.…”

Section: A Dc-link Capacitance Sizingmentioning

confidence: 99%

Battery Storage System as Power Unbalance Redistributor in Distribution Grids Based on Three Legs Four Wire Voltage Source Converter

Stecca

Soeiro

Iyer

et al. 2022

IEEE J. Emerg. Sel. Topics Power Electron.

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This article discusses the application of battery energy storage systems (BESSs) as power redistributors in three-phase distribution grids as an add-on functionality to typical BESS applications, such as congestion management and energy arbitrage. Combining those ancillary services into a single power unit is not yet performed in practice but may constitute an emerging business opportunity to increase the BESS revenues. The unbalanced operation of the BESS voltage source converter (VSC) leads to the circulation of low-frequency current harmonics in the dc-link through the capacitors and the battery cells. Therefore, it is particularly interesting whether relatively large 50-and 100-Hz currents can safely circulate within these components. Analytical modeling and design guidelines for the dc-link of a three-leg four-wire two-level VSC operating under unbalanced loads are detailed. Furthermore, a low-power VSC prototype is used to demonstrate the working principle of the BESS, providing power unbalance redistribution and symmetric power exchange. Additionally, the ICR18650-26F Lithium-ion cells are cycled to reach end-of-life with different current profiles and C-ratings. The analysis shows that charging with a 100 Hz ripple superimposed to the dc current leads to a 10% increment in degradation.

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Section: A Dc-link Capacitance Sizingmentioning

confidence: 99%