Modular multilevel converters: Recent achievements and challenges

MA Perez, S Ceballos, G Konstantinou… - IEEE Open Journal …, 2021 - ieeexplore.ieee.org
The modular multilevel converter (MMC) is currently one of the power converter topologies
which has attracted more research and development worldwide. Its features, such as high …

Classification and dynamic assessment of droop-based grid-forming control schemes: Application in HVDC systems

E Rokrok, T Qoria, A Bruyere, B Francois… - Electric Power Systems …, 2020 - Elsevier
This paper introduces a novel classification for droop-based control strategies towards
emerging interest of utilizing grid-forming control schemes in high voltage direct current …

Grid-forming control to achieve a 100% power electronics interfaced power transmission systems

T Qoria - 2020 - pastel.hal.science
The rapid development of intermittent renewable generation and HVDC links yields an
important increase of the penetration rate of power electronic converters in the transmission …

The role of the internal energy in MMCs operating in grid-forming mode

E Sánchez-Sánchez, E Prieto-Araujo… - IEEE Journal of …, 2019 - ieeexplore.ieee.org
With an increasing number of renewable energy resources being integrated into the power
system through power electronics, conventional power plants based on large synchronous …

Load balancing of a modular multilevel grid-interface converter for transformer-less large-scale wireless electric vehicle charging infrastructure

G Guidi, S D'Arco, K Nishikawa… - IEEE Journal of Emerging …, 2020 - ieeexplore.ieee.org
This article analyzes the requirements for load balancing of a new transformer-less grid-
interface topology for large-scale electric vehicle (EV) charging infrastructures. The …

On fault-ride-through performance in MMC-HVDC applications controlled as a virtual synchronous machine

C Hirsching, M Goertz, S Wenig… - IEEE Transactions …, 2022 - ieeexplore.ieee.org
Due to decreasing inertia within the German transmission grid, HVdc transmission links are
recently planned as a grid-forming asset in order to contribute to the overall system stability …

Capacitor Voltage Feedforward-based Voltage Loop Control for Grid-forming Modular Multilevel Converters Under Wide-range of Grid Strength

W Liu, R Wang, T Kerekes, T Dragicevic… - … on Power Electronics, 2023 - ieeexplore.ieee.org
An efficient closed-loop voltage tracking control (VTC) for a grid-forming-based converter is
required for precise voltage regulation. However, few papers designed a VTC exclusively for …

Negative sequence control for virtual synchronous machines under unbalanced conditions

EB Avdiaj, S D'Arco, L Piegari… - IEEE Journal of Emerging …, 2022 - ieeexplore.ieee.org
In this article, five strategies for controlling the negative sequence currents of a virtual
synchronous machine (VSM) under unbalanced conditions are comparatively assessed …

Nonlinear Controller for MMC-HVdc Operating in Grid-Forming Mode

LFN Lourenço, A Iovine, G Damm… - … on Control Systems …, 2024 - ieeexplore.ieee.org
The development of the modular multilevel converter (MMC) enabled the efficient creation of
high-power high-voltage direct current (HVdc) transmission systems. As a result, MMC-HVdc …

Optimal sha** of the MMC circulating currents for preventing AC-side power oscillations from propagating into HVdc grids

G Bergna-Diaz, JA Suul, E Berne… - IEEE Journal of …, 2019 - ieeexplore.ieee.org
A constrained optimization problem based on the Lagrange multipliers method is formulated
to derive the circulating current references of modular multilevel converters (MMCs) directly …