Electrical Engineering

Welcome to the master thesis presentation &nbsp; &nbsp;&nbsp; Positioning of Charger Stations for a fully electrified Swedish Transport System Consequence on the Power System by Shenglai Jin &nbsp;&nbsp; Friday, December 13, 11:00 Fredrik Lamms room, Chalmers Electric Power Engineering division&nbsp; Opponent: Yumeng Shao Examiner: Torbjörn Thiringer
Abstract&nbsp; In pursuing a fully electrified transportation system, with the promotion of electric vehicles, existing traffic prediction models are showing weakness. The inadequate layout of charging facilities fails to meet demands, and the growing energy consumption has severely impacted the power system. This study proposes an integrated energy optimization and charging infrastructure framework (EOIET), addressing the challenges during the electrification process. In terms of energy consumption prediction, the study established urban traffic flow energy consumption estimation models UCEM and UTEM based on macro traffic data, and constructed a long-distance traffic flow energy consumption prediction model through the LSTM-GRU model with Rayleigh distribution assumption. For the optimization of charger station layout, the study comprehensively considered the decentralized nature of the urban layout and applied a simulated annealing model and topology optimization techniques to determine the optimal location of long-distance charging stations. The power system impact assessment uses Monte Carlo simulation combined with deep learning algorithms to optimize the power transmission strategy and evaluate the grid stability and load balance. The study verified the model based on Sweden's historical transportation energy consumption and relevant EU indicators, which confirmed the reliability of the model. It provided a reference for infrastructure development and grid optimization in the context of electrified transportation.
Welcome!&nbsp; Shenglai and Torbjörn&nbsp;

Welcome to MSc thesis presentation by Nehru Selvan Selvasekar &nbsp; Development and impementation of test cells to perform DC and LI breakdown testing of materials used in HVDC cable accessories &nbsp; Date: Friday, December 20, 2024 Time: 11:00 – 12:00 Place: Fredrik Lamm &nbsp; Supervisors and advisers: Susanne Nilsson, Sajjad Jafari and Rashid Hussain, NKT HV Cables, Alingsås Examiner: Yuriy Serdyuk Opponent: Fanuel Gebremariam Abstract: High-voltage direct current (HVDC) systems are more effective at transmitting power over long distances than alternating current (AC) systems and offer precise control over power flow, enhancing grid stability and reduced losses. For these reasons, HVDC transmission is the choice for connecting remote renewable energy sources, such as offshore wind, to load centers using cables.&nbsp; Cable accessories are critical elements of HVDC cable systems. To ensure they reliable operation, proper selection of materials is crucial and should be based on knowledge of materials performance at various electric field levels and temperatures. Nowadays, Ethylene Propylene Diene Monomer (EPDM) insulation and other so-called Field Grading Materials (FGM) are used in cable accessories. EPDM rubber is considered as one of the most suitable material for such applications due to its low electric conductivity, low dielectric loss, processability, etc. FGM can be produced by incorporating specific fillers into the base material (e.g. EPDM) and is designed to control and distribute electric fields within electrical insulation systems. The materials should be tested in a wide range of conditions that imposes strict requirements to the test setup including an electrode system, bushings, voltage supply, etc. &nbsp; The dielectric test is one of the electrical methods used to determine the dielectric strength of rubber materials. In the thesis, a test cell for performing dielectric tests at applied voltages of up to 150kV was designed and verified. On the design stage, CAD modelling and electric field simulations with COMSOL Multiphysics have been conducted. The suggested design was essentially a molded electrode setup capable to eliminate the influence of the surrounding medium and providing stable conditions for further endurance testing. The test cell was built and the design was verified by conducting short-time and long-time tests including AC and DC breakdown experiments as well as LI breakdown tests on EPDM and FGM insulation samples. The experiments confirmed the feasibility of the suggested design and the test cell has been adopted for the use in the high voltage material laboratory.
Everyone is most welcome! &nbsp; Nehru and Yuriy
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Presentation of master thesis

Master thesis presentations at Electrical Engineering

13 December 2024

11.00-12.00 Shenglai Jin, MPEPO

20 December 2024

11.00-12.00 Nehru Selvan Selvasekar, MPEPO