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Item type:Publication, Access status: without files , Implications of the grid location for different operational use cases of dc links in ac distribution systems(Institution of Engineering and Technology (IET), 2026-04); ; ; The ongoing energy transition increases the complexity of power system operation and planning, particularly at the distribution system level. Rising electrification and decentralized generation challenge the existing grid infrastructure. Integrating direct current (DC) technology into alternating current (AC) distribution systems offers significant potential to enhance operational flexibility and reduce grid reinforcement needs. This paper contributes to the development of combined methods for the operation and planning of DC links in AC distribution systems by providing a better understanding of the mutual dependence between the choice of operational use cases and grid location. It investigates implications of the grid location for the operational use cases minimisation of active power losses, minimisation of relative branch current loading and minimisation of node voltage deviations. The three use cases are applied to four configurations of a benchmark system. These configurations represent a reference case without a DC link and three different locations for the integration of a single DC link. The results show that the benefit of integrating a DC link into an existing AC distribution system strongly depends on the location of the DC link. Furthermore, the implications of each location also depend on the chosen operational use case.Publicationtype: Conference Paper27 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Comparison and combination of axial induction and wake redirection control for wind farm power output maximisation and grid power reference tracking(Institution of Engineering and Technology (IET), 2024-10); ; This paper investigates the integration of axial induction control (AIC) and wake redirection control (WRC) in wind farms to optimise power output by addressing wake interactions among turbines that diminish wind speeds for downstream turbines. The study uses two analytical models, the Jensen Park and the Bastankhah Gaussian wake models, and three different software environments: FLORIS for wake effect simulation, FAST.Farm for mechanical load analysis, and WFSim for closed-loop simulations. The findings reveal that AIC, according to the Park model, offers potential power output improvements between 4% and 19% for wind turbine arrays of two to ten turbines, but WRC shows enhancements from 8% to 30% for the same number of turbines in an array, as calculated with the Gaussian model and the FLORIS software. However, a proof of concept in FAST.Farm with a two-turbine configuration demonstrates potential disadvantages of WRC, which increases tower loads considerably, motivating combined AIC-WRC to operate the turbine at the smallest yaw misalignment angle possible. Closed-loop simulations demonstrate a reduction in power reference tracking error by up to a factor of 3.9 using Koopman Model Predictive Control with combined AIC-WRC as compared to AIC control on the same simple two-turbine configuration.Publicationtype: Conference Paper21 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Towards pragmatic interoperability: a conceptual framework for an energy IoT platform in the german energy sector(Institution of Engineering and Technology (IET), 2024-06); ; ; Bittermann, LukasThis paper introduces an innovative conceptual framework for an Energy Internet of Things (eIoT) platform designed to address challenges related to grid congestion, voltage limit violations, and the growing demands on low-voltage grids due to increased electrification in the energy and heating sectors. The proposed platform seamlessly integrates cutting-edge technologies including advanced data collection, state estimation algorithms, AI-driven decision-making processes, and grid control functionalities. Its primary objective is to facilitate proactive measures aimed at enhancing energy distribution efficiency and effectively managing consumption devices while ensuring compliance with regulatory standards such as §14a of the Energy Industry Act (EnWG) in Germany.Publicationtype: Conference Paper52