Contructive Approach to Passive and Active Hybrid Integrated EMI Filters for High-Frequency ConvertersAn alternative approach for integrating an active EMI filter with a passive EMI filter is a good idea to minimize the volume and weight of a power converter. This approach is particularly effective in reducing the size of common-mode (CM) chokes within the passive EMI filters, achieving a notable 55% reduction. The combination of these two types of filters is commonly referred to as a hybrid EMI filter. The studies show that the integrated active EMI-filter effectively supress conducted common-mode (CM) emissions by about 20 to 25 dB in the frequency range from 9 kHz to 1 MHz.The following tasks are being performed:• Development of the active filter according to the Voltage Sense Current Injection (VSCI) configuration• Investigation of the impedance stability analysis of active filters• Investigation of the active filter with a passive EMI filter• Investigation and optimization of the grid-side passive and active Hybrid Integrated EMI filter structure,• Investigation and optimization of the motor-side passive and active Hybrid Integrated EMI filter structure• Verification of the simulation results by experimental tests• EMI measurement with passive and active filters in the frequency range from 9 kHz to 30 MHz.

Optimization of layout and components of EMI-FiltersOptimierung des Aufbaus und der Komponenten von EMV-FilternThe following tasks were performed: - Investigation and optimization of the DC-side filter structure,- Investigation and optimization of the AC-side filter structure, - Investigation of optimization possibilities in the design of filter components (capacitors, inductors and PCB layout),- Investigations on the overall system: simulation of the overall electrical system consisting of the feed-in, LISN, optimized DC filter, inverter, optimized AC filter, motor supply cable, and motor; - Verification of the achievement of objectives with regard to compliance with EMC limits at the LISN and comparison of simulation and measurement results and evaluating target achievement of the overall design, - Documentation: Progress reports, presentations for PA meetings, publications internationally, a contribution for FVA Information meeting, or similar.

Electromagnetic effects of fast switching wide bandgap semiconductors on drive systems and their prediction based on geometry data.Elektromagnetische Auswirkungen schnell schaltender Wide-Bandgap-Halbleiter auf Antriebssysteme und ihre Vorausberechnung auf Basis von GeometriedatenThe following tasks were performed: - High-frequency modeling of the power electronics,- Simulation model of SiC MOSFET half-bridge module using ANSYS Q3D FEM software, - Simulation model of the three-phase inverter using ANSYS Q3D FEM software, - Modeling of motor cables with ANSYS 2D FEM software, - 3D modeling of EMI input and output filters, - Creation of the overall model from all functional units: Power electronics, cables, electrical machine, EMI filters,- Validation of simulation models with measurements,- Development of improved methods for geometries, physical arrangements, filters, cable lengths, EMI measurements of the entire drive systems,- Documentation: progress reports, presentations for PA meetings, Publications internationally, a contribution for FVA information meetings, or similar.- Supervision of bachelor and master theses,- Supervision of the laboratories Power Electronics I and II- Preparation for the exams for Power Electronics I,- Project management, and teamwork in different projects.

Measurement of the Stochastic Electromagnetic Field Coupling to Multiconductor Cables above a Ground Plane in a Reverberation ChamberThe following tasks have been performed:• literature survey about preceding measurements• assembly of a suitable measurement setup• measurement of the coupled voltage by amplitude and phase at the terminals for different configurations of the multiconductor cable (various lengths, different alignments of the conductorsand different terminations)• analysis of the coupling between two-wire lines• statistical analysis of the results and comparison with theoretical predictions• validation of the measurement and numerical results

Simulation of the Stochastic Electromagnetic Field Coupling to Multiconductor Transmission Lines with CONCEPT-IIThe following multiconductor transmission lines have been analyzed:• two wires with the same height over a ground plane,• two wires on top of each other over a ground plane,• two wires with different heights and separations over a ground plane, and• symmetrical three-wire lines with different alignments over a ground plane.The following tasks have been performed:• validation for the excitation with a single plane wave against transmission line theory,• numerical simulation of the coupled voltages at all relevant line ends for different frequencies anddifferent boundary conditions,• statistical analysis of the coupled voltages (mean value and standard deviation of the real andimaginary part, magnitude, and squared magnitude, minimum and maximum values, probabilitydensity and cumulative distribution function) using MATLAB software,• graphical presentation of the results in a suitable manner,• comparison of the numerical results with results of transmission line theory.

Simulation of the Radiated Emissions of a Grid Connected Photovoltaic System with the FEKO Computational Electromagnetics SoftwareThe following tasks have been performed:• reproduction of the current path inside an exemplary COTS photovoltaic module in thesimulation software• simulation of the electric and magnetic field strength in a certain distance (e. g. 10 m)• consideration of differential-mode and common-mode excitation• analysis of the influence of different port impedances of the GCPC and the photovoltaicmodules as a function of the frequency• comparison of the emitted field strength with standard limits such as FCC, CISPR• comparison of the results with results of former projects using CONCEPT-II and thenumerical electromagnetic code

Reliability of information and communication technology equipment in power system – study reviewThe following tasks have been performed:• literature and research study on ICT systems in a Power Grid• definition and characterization of relevant ICT components for data exchange in Smart Grid• description of reliability issues and its measures• numerical description of the reliability of ICT components.

Duties & Responsibilities: • Planning, Design, Project management of different Low Voltage, Medium Voltage and High Voltage Substation projects.• Supervision of Erection, Testing, Commissioning and Maintenance work of different Low Voltage, Medium Voltage and High Voltage Substation projects.• Electrical Design, Supervision of Fitting, Fixing work of High-rise Buildings.• Tender preparation and documentation of different Low Voltage, Medium Voltage and High Voltage Substation tenders, etc.Completed Project:• Engineering and Consultancy for construction of 132/33kV Substation at Sitalpur Steel Mills Limited.• Supervision of Erection, Testing, Commissioning and Maintenance work of different LV Substation projects.• Electrical Design, Supervision of Fitting, Fixing work of room of PANPACIFIC SONARGAON HOTEL.• Planning, Design, Testing, Commissioning and Engineering for construction of 11/33 KV Substation at CEPZ & DEPZ of UNITED POWER GENERATION & DISTRIBUTION CO. LTD.