214.

R. Wegener and S. Soter, "Using Standard Ethernet and Hardware PTP for Distributed Control of Multi-Megawatt Converters", ICPEA2026, Langkawi, Malaysia, Mai 2026.

Abstract:
This paper presents a cost-effective communication and measurement architecture for multi-megawatt power converters based on standard Ethernet. To reduce analog cabling, improve measurement robustness, and enable modularity, control units and ADCs are mounted close to the power modules, while digitized measurement data are exchanged over an Ethernet network. Precise time alignment of distributed measurements is achieved using hardware-assisted IEEE 1588 Precision Time Protocol (PTP). In contrast to common approaches relying on fully PTP-aware switches, the proposed system employs commodity unmanaged Ethernet switches and mitigates their nondeterministic behavior through per-link delay calibration, cyclic traffic scheduling, and application-level safeguards. A TDMA-like communication scheme with timestamped UDP or raw Ethernet frames bounds latency and jitter while avoiding retransmissioninduced delays. Experimental results from a multi-converter wind-turbine installation demonstrate sub-microsecond synchronization accuracy under field conditions, confirming that standard Ethernet with appropriate system design can meet the timing requirements of phase-sensitive power-electronic control.

213.

R. Wegener, S. Gruber and S. Soter, "Automated Workflow for Creating Lecture Videos from LaTeX Beamer Slides", EDULearn 2025, Palma Spain, Jun. 2025.

Abstract:
An automated workflow for the creation of instructional videos from LaTeX documents is described. For this purpose, a new latex extension is developed, that uses open-source software and an AI-based text-to-speech synthesizer to convert the explanatory text into audio and to edit it together with the lecture slides into a video. By automating the process, subsequent changes can be made very easily, allowing all materials to be revised at any time with minimal effort. Video subtitles can also be generated automatically to ensure accessibility.

212.

H. Bode, R. Wegener, M. Werle, K. Siebert, M. Kiel and K. Temmen, "“GET IT DIGITAL”: A Systematic Approach to Developing Multimedia OER Lecture Material in Electrical Engineering", EDULearn 2025, Palma Spain, Jun. 2025.

Abstract:
Fundamentals of electrical engineering are key components of various STEM (science, technology, engineering and mathematics) disciplines at universities. However, teaching materials in this field are often inconsistent, didactically incomplete, not immediately self-explaining , or have an unclear copyright status. Inadequate learning resources can lead to student frustration and, among other factors, contribute to the high dropout rates in STEM programs. The project "GET (German abbreviation for fundamentals of electrical engineering, “Grundlagen der ElektroTechnik”) it digital" is a collaboration between six partner universities addressing this issue. This paper describes the project´s approach to developing modular and flexibly applicable OER (Open Educational Resources) materials for both students and instructors, ensuring easy accessibility, adaptability, and seamless integration into diverse teaching and learning environments. At its core, the project consists of 12 modules covering the full spectrum of electrical engineering fundamentals. Implemented in LaTeX, the materials include a comprehensive written script, a set of lecture slides, and learning videos featuring animations with AI-generated voice narration. This multi-channel approach provides students with consistent content across different learning formats. Instructors can freely combine modules according to their specific teaching needs. To support this process, the project offers guidelines for instructors as well as exemplary adaptations of lectures tailored to the varying taxonomy requirements of different degree programs.

211.

S. Schaefer, S. Kratz and S. Soter, "Development of a drive unit for a medical breast pump", Healthcom, Nara, Japan, Nov. 2024.

Abstract:
This paper presents a cooperative project, supported by the German government, between the University of Wuppertal and a company in the medical sector. The paper includes the construction of the drive unit and explains the main features of the mechanics and electronics being developed. These pumps are designed for a niche between medical devices and consumer hardware. To enable mobile usage, the new pump must be lighter and smaller than the existing ones. It should also have a water-proof housing for faster disinfection. The pump is designed so that both breasts can be treated individually. An integrated touch display and Bluetooth Low-Energy connectivity shall provide an easy operation and documentation. For predictive maintenance aspects the pump transmits data to a server via LTE.

210.

R. Wegener,Vielfältige Einsatzmöglichkeiten von Antriebssystemen in der elektrischen Energietechnik. 2024.

209.

T. Schmidt, J. O. Krah and J. Holtz, "Diverse Redundant Drive Architecture with External Diagnostics Enables Safety-Related Motor Control based on Proven Standard Components at Low Cost" in 2024 4th International Conference on Smart Grid and Renewable Energy (SGRE), 2024, pp. 1--6.

Abstract:
A concept for safety-related motor control for autonomous mobile robots (AMR), automated guided vehicles (AGV), etc. is presented. The drive-internal safety functions are reduced to safe torque off (STO) and safe brake control (SBC) via a safety-related fieldbus for a reliable stopping of the motor. The safe protocol data units (SPDUs) for safe motion are evaluated in a higher-level safety programmable logic controller (PLC). The current and position SPDUs from the drives are transmitted to the safety PLC via a safety-related fieldbus using the gray-channel-principle. Similar to safety-related encoders, the concept is based on the fact that a major part of the diagnostics from the drive is performed externally in the higher-level safety PLC. In combination with a diverse redundant drive architecture, low-cost standard components can be used instead of more expensive safety-certified components. As a result, a fully certified safe logic is not required in the drive.

208.

J. O. Krah and J. Holtz, "Fast Current Limiting with Virtual Synchronous Generators" in 2024 4th International Conference on Smart Grid and Renewable Energy (SGRE), 2024, pp. 1--6.

Abstract:
Installations of renewable energy systems like photovoltaic arrays and wind power generators are increasing in number. Problems may occur when such systems get installed on weak grids. Other than in major power distribution grids can sudden load changes endanger a stable operation of such systems. This is due to the high internal impedance of weak grids. The installation of virtual synchronous generators (VSG) stabilizes local grids. It absorbs the transients and existing current harmonics and also improves the power quality by compensating reactive components. Combined with fast current limitation, fault ride through (FRT) events are now possible, even with very fast switching inverters and their low inductance.

207.

T. Wilkening, J. Holtz and J. O. Krah, "Mixed-Critical Control Architecture for Industry 5.0" in 2024 4th International Conference on Smart Grid and Renewable Energy (SGRE), 2024, pp. 1--6.

Abstract:
Industry 5.0 achieves productivity gains through human-machine collaboration. Various architectures for safety-related control of cobots, automated guided vehicles (AGV) and autonomous mobile robots (AMR) are presented and compared concerning their safety-related computational performance. From this, an appropriate mixed-critical control architecture is proposed, with an emphasis on functional safety including multi-axis safe motion.

206.

J. Holtz, "Predictive Finite-State Control---When to Use and When Not", IEEE Transactions on Power Electronics, vol. 37, no. 4, pp. 4225--4232, 2022.

Abstract:
A multistep predictive algorithm eliminates overshoots of the current vector outside the boundary circle while the processor identifies the next optimal switching state vector following a boundary transition. The predictions of the current vector trajectories refer to a simplified machine model consisting only of the leakage inductance. Nevertheless is good accuracy of the predictions achieved. Operation at low switching frequency minimizes both harmonic distortion and switching losses. Using higher switching frequencies does not lead to noticeable improvement over ordinary carrier modulation. Maximum fundamental output voltage is achieved by predictive overmodulation.

205.

K. Nötzold, N. Brissing, A. Uphues and S. Soter, "Generalized Integrator Based Active Damping" in 2022 IEEE 7th Southern Power Electronics Conference (SPEC), 2022, pp. 1--6.

Abstract:
To actively damp the inherent resonance of a LCL-topology applied as an output filter for a grid-connected inverter without capacitor current measuring capability, the derivative of the capacitor voltage can be utilized and fed back instead. However, digital implementation of this derivative is generally challenging due to noise-sensitivity or an introduced phase lag. In literature a second-order nonideal generalized integrator is proposed to indirectly differentiate the capacitor voltage and successfully tested in combination with a control loop based on grid current feedback. Here, this damping approach is adapted to a control loop based on converter current feedback. Simultaneously, and in contrast to more complex damping functions suggested in literature, the phase lag caused by computational delay is particularly compensated by simple proportional capacitor voltage's derivative feedback. To determine the required feedback constant, the feedback path is transformed into an equivalent impedance, connected in parallel to the filter capacitor. Consequently, the generalized integrator as well as the proportional feedback constant is simply parameterizable regarding the desired overall damping constant. Finally, experimental results with a 625 kW inverter demonstrate the active damping capability across a large frequency range.