Abstract
This paper proposes an in-depth analysis from the control point of view of dynamic models of a modular multilevel converter (MMC) for high-voltage direct current (HV-DC) application. Firstly, a generic method of analysis is presented for a natural arm-level state-space model. Its structural analysis highlights the decoupled nature of the MMC. Secondly, the well-known sum and difference of the upper and lower arm state and control variables is considered to obtain a (Σ∕Δ) model. This transformation leads to a coupling between state and control variables and to an increase of the system complexity. Using the analysis results of the natural model and the (Σ∕Δ) model, an original arm-modular control is finally proposed. The simulation results show the effectiveness of the proposed control, which is simpler to design compared to a conventional (Σ∕Δ) control.
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Notes
- 1.
A rough idea of the converter losses is necessary to take into account all the “first-order” damping phenomena.
- 2.
The β[i] notation here refers to the i-st component of the vector β.
- 3.
10PU/s is considered as very fast from a power transmission point of view, and corresponds to the fastest response that may be required in real HVDC point-to-point applications.
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Acknowledgements
This work was supported by a grant overseen by the French National Research Agency (ANR) as part of the Investissements d’Avenir Program (ANE-ITE-002-01).
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Steckler, PB., Gauthier, JY., Lin-Shi, X., Wallart, F. (2020). Structural Analysis and Modular Control Law for Modular Multilevel Converter (MMC). In: Zamboni, W., Petrone, G. (eds) ELECTRIMACS 2019. Lecture Notes in Electrical Engineering, vol 615. Springer, Cham. https://doi.org/10.1007/978-3-030-37161-6_14
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DOI: https://doi.org/10.1007/978-3-030-37161-6_14
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