R
Roni Luhtala
Researcher at Tampere University of Technology
Publications - 32
Citations - 372
Roni Luhtala is an academic researcher from Tampere University of Technology. The author has contributed to research in topics: Electrical impedance & Grid. The author has an hindex of 8, co-authored 31 publications receiving 224 citations.
Papers
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Journal ArticleDOI
Hardware-in-the-Loop Methods for Real-Time Frequency-Response Measurements of on-Board Power Distribution Systems
Tomi Roinila,Tuomas Messo,Roni Luhtala,Rick Scharrenberg,Erik de Jong,Alejandra Fabian,Yin Sun +6 more
TL;DR: In this paper, the authors present implementation techniques of the wideband methods using power-hardware-in-the-loop measurements based on OPAL-RT real-time simulator.
Journal ArticleDOI
Implementation of Real-Time Impedance-Based Stability Assessment of Grid-Connected Systems Using MIMO-Identification Techniques
TL;DR: A real-time implementation for the online stability analysis using MIMO-identification methods, where the stability of grid-connected system is rapidly assessed in the dq domain using orthogonal injections and Fourier techniques.
Journal ArticleDOI
Autonomous reactive power support for smart photovoltaic inverter based on real-time grid-impedance measurements of a weak grid
TL;DR: A method for real-time compensation of the unintended reactive power, which decouples the reactive power from the active power of a photovoltaic inverter, which outperforms conventional power factor control even when the conventional method is tuned optimally with known grid inductance.
Proceedings ArticleDOI
Accurate Impedance Model of Grid-Connected Inverter for Small-Signal Stability Assessment in High-Impedance Grids
TL;DR: An impedance model is presented, which includes the effect of feedforward, to analyze impedance-based stability in the presence of large grid impedance, and is shown to give accurate prediction of small-signal stability when the Nyquist stability-criterion is applied.
Proceedings ArticleDOI
Adaptive control of grid-connected inverters based on real-time measurements of grid impedance: DQ-domain approach
TL;DR: In this paper, the grid impedance is measured online using a pseudo-random-binary-sequence (PRBS) injection and Fourier techniques, and the inverter control parameters are then adjusted based on the measurements.