L
Lennart Angquist
Researcher at Royal Institute of Technology
Publications - 81
Citations - 4845
Lennart Angquist is an academic researcher from Royal Institute of Technology. The author has contributed to research in topics: Converters & Voltage. The author has an hindex of 31, co-authored 81 publications receiving 4429 citations.
Papers
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Proceedings Article
On dynamics and voltage control of the Modular Multilevel Converter
TL;DR: In this article, the authors discuss the impact of modulation on stability issues of the Modular Multilevel Converter (M2C) and suggest a control method that offers stable operation in the whole operation range.
Journal ArticleDOI
Dynamic Analysis of Modular Multilevel Converters
TL;DR: It is shown that the sum capacitor voltage in each arm often can be considered instead of the individual capacitor voltages, thereby significantly reducing the complexity of the system model.
Journal ArticleDOI
Open-Loop Control of Modular Multilevel Converters Using Estimation of Stored Energy
Lennart Angquist,Antonios Antonopoulos,Daniel Siemaszko,Kalle Ilves,Michail Vasiladiotis,H-P Nee +5 more
TL;DR: In this paper, a new approach is described based on estimation of the stored energy in the arms by combining the converter electromotive force reference, the measured alternating output current, and the known direct voltage.
Journal ArticleDOI
Modular Multilevel Converter AC Motor Drives With Constant Torque From Zero to Nominal Speed
Antonios Antonopoulos,Lennart Angquist,Staffan Norrga,Kalle Ilves,Lennart Harnefors,Hans-Peter Nee +5 more
TL;DR: In this paper, the authors investigated principles for converter operation with high torque in the whole speed range and provided experimental results from a down-scaled 12-kVA prototype converter running a loaded motor at various speeds between standstill and the rated speed.
Proceedings ArticleDOI
Evaluation of control and modulation methods for modular multilevel converters
Daniel Siemaszko,Antonios Antonopoulos,Kalle Ilves,Michail Vasiladiotis,Lennart Angquist,Hans-Peter Nee +5 more
TL;DR: In this paper, an evaluation of four different control and modulation methods for the modular multilevel converter is presented, based on experiments on a down-scaled 10 kVA converter having 10 submodules per phase leg.