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50 results on '"Johannsson, Hjortur"'

2. A Novel Phasor Power Oscillation Damper With Adaptive Phase Compensation, Achieved Using Multiple Model Adaptive Estimation

Author

Haugdal, Hallvar, Uhlen, Kjetil, and Johannsson, Hjortur

Abstract

In this paper, an adaptive version of the well known Phasor Power Oscillation Damper is presented. The proposed controller is adaptive in the sense that the phase compensation between the measured input and the applied control action is adjusted online during changing operating conditions. This is achieved through Multiple Model Adaptive Estimation, where a bank of Kalman filter estimators are run in parallel. A system model is inferred by assessing the performance of the individual filters, and used to update the tuning of the controller online. The proposed adaptive phase compensation scheme is compared with a similar scheme found in the literature, and is found to exhibit superior performance under the tested conditions. Simulation results from the Single-Machine Infinite Bus system, Kundur's Two-Area System and the IEEE 39-Bus System demonstrate that the proposed controller is able to adjust the phase compensation in response to severe non-linear events, and to eliminate phase lag due to communication latency.

Published
2023
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3. The Energy Islands: A Mars Mission for the Energy system

Author

Cutululis, Nicolaos A., Blaabjerg, Frede, Østergaard, Jacob, Bak, Claus Leth, Anderson, Mattias, Silva, Filipe Miguel Faria da, Johannsson, Hjortur, Wang, Xiongfei, and Jørgensen, Birte Holst

Subjects
SDG 7 - Affordable and Clean Energy
Abstract

Denmark has set ambitious targets, to reduce emission with 70% by 2030 and become independent of fossil fuels by 2050. To achieve those targets, Denmark is planning to accelerate the de-carbonization of the power system, by replacing fossil fuel generation plants with renewable energy sources (RES). Offshore wind power will form the backbone of power generation in a decarbonized system. Already world leading in electric consumption share covered by wind power, Denmark plans to install an additional 6.8 GW of offshore wind by 2030, quadrupling the 1.7 GW already connected to the system.

Published
2021

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