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- W4386500775 abstract "Small-signal stability of a grid-connected modular multilevel converter (MMC) is determined by its admittance characteristics, which is sensitive to its terminal power flow. However, the MMC admittance is often treated as constant regardless of power flow, which consequently leads to inaccurate stability analysis. This paper derives and demonstrates the sequence admittance shaping effects of power flow in an MMC by dividing the ac admittance into two parts. One is dominated by the phase-locked loop (PLL) and the other is dominated by the MMC internal dynamics, which only shapes the low-frequency admittance. The influence of both the output and the circulating current controller gains on the admittance shaping effect of power flow in MMCs is analyzed, noting their opposing effect in the low-frequency range. The theoretical analysis is validated by real-time simulation grid interaction studies, which demonstrate that system stability changes with MMC power output variation. Accurate analytical stability boundaries can be derived by accounting for the stability effects of power flow. Such improvements enable the development of optimal control designs and guarantee system stability across varying grid conditions." @default.
- W4386500775 created "2023-09-07" @default.
- W4386500775 creator A5012334378 @default.
- W4386500775 creator A5014201042 @default.
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- W4386500775 date "2023-12-01" @default.
- W4386500775 modified "2023-10-16" @default.
- W4386500775 title "Admittance shaping effects of power flow in modular multilevel converters" @default.
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- W4386500775 doi "https://doi.org/10.1016/j.epsr.2023.109808" @default.
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