Fakultät I - Elektro- und Informationstechnik
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Im Zeitalter der Industrie 4.0 avanciert das Energie-Monitoring zu einem unerlässlichen Instrument, um die Energieeffizienz zu steigern und Betriebskosten in Produktionsanlagen zu minimieren. Die Hochschule Hannover bildet Studierende mithilfe einer Modellfabrik praxisnah aus. Anhand dieser Produktionsanlage, die Medikamente autonom kommissioniert und verpackt, lernen sie das Energie- und Prozessmanagement umfassend kennen.
Electrical power system operators (SOs) are free to realize grid operations according to their own strategies. However, because resulting power flows also depend on the actions of neighboring SOs, appropriate coordination is needed to improve the resulting system states from an overall perspective and from an individual SO perspective. In this paper, a new method is presented that preserves the data integrity of the SOs and their independent operation of their grids. This method is compared with a non-coordinated local control and another sequential method that has been identified as the most promising distributed optimization method in previous research. The time series simulations use transformer tap positioning as well as generation unit voltage setpoints and reactive power injections as flexibilities. The methods are tested on a multi-voltage, multi-SO, realistic benchmark grid with different objective combinations of the SOs. In conclusion, the results of the new method are much closer to the theoretical optimum represented by central optimization than those of the other two methods. Furthermore, the introduced method integrates a sophisticated procedure to provide fairness between SOs that is missing in other methods.
Dieses Paper behandelt die Anbindung von Unternehmen an digitale Ökosysteme um die Zusammenarbeit in ihren Wertschöpfungsnetzwerken zu optimieren. Mit Fokus auf datensparsamen Informationsaustausch in Wertschöpfungsnetzwerken durch Datenökosysteme werden verschiedene Konzepte untersucht. Dabei werden Fragen zu vorhandenen Datenökosystemen, Zielgruppen, Kombinierbarkeit und dem Schutz der Datensouveränität adressiert. Dazu werden die identifizierten Konzepte miteinander verglichen und deren Eigenschaften eingeordnet. Die verschiedenen Konzepte werden klassifiziert und eingeordnet.
Pressing of Functionalized Polymer Composite Materials to Improve Mössbauer Measurement Signals
(2024)
Coordination compounds, like iron(II) triazole complexes, exhibit spin crossover (SCO) behavior at around room temperature. Therefore, they are interesting for a variety of possible applications, and it is convenient to integrate them into polymers. Due to a reduction of the iron content and thus also 57Fe content in the sample through integration in polymers, Mössbauer measurements are only possible with greater difficulty or very long measurement times without expensive enrichment of the samples with 57Fe. So, other ways of improving the Mössbauer signal for these composite materials are necessary. Therefore, we pressed these composite materials to improve the Mössbauer spectra. In this study, we synthesized an iron(II) triazole spin crossover complex and an electrospun polymer complex composite nanofiber material including the same complex. For both products, Mössbauer measurements were performed at room temperature before and after using a press to show that the complex composite is not harmed through pressing. We investigate the influence of the pressing impact on the Mössbauer measurements in the context of measurement statistics and the measured signals. We show that pressing is not connected to any changes in the sample regarding the spin and oxidation state. We present that pressing improves the statistics of the Mössbauer measurements significantly. Furthermore, we use SEM measurements and PXRD to investigate whether or not the obtained fiber mats are destroyed in the pressing process.
In light-processing systems, light energy is converted into a photocurrent due to the photoelectric effect. This project focuses on the development of a high-precision energy-to-voltage conversion technique to optimize signal processing in light-processing systems, specifically for applications in space analytics or solid state physikcs, such as Mössbauer spectroscopy. Analog circuit development plays a vital role as downstream voltage conversion is necessary for signal processing. The objective is to enhance the signal quality and improve the signal-to-noise ratio through the design, optimization, and comparison of various circuits for voltage conversion. The development process involves the design and optimization of amplifier circuits, supplemented with the incorporation of filters and/or regulators for further improvement. A transimpedance amplifier is approximated as a second-order low-pass filter, while a state controller is designed and analyzed to efficient transient oscillation of the system towards optimal amplitude values for subsequent signal processing. The project's results contribute to the advancement of light-processing systems, enabling more precise analysis of light energy in Mössbauer spectroscopy. The findings are presented in a series of scientific publications, showcasing the effectiveness of the developed circuits and their impact on signal quality. Future work could focus on further optimization and validation of the circuits in real-world applications to confirm their performance and reliability. Overall, this project emphasizes the significance of meticulous circuit development and optimization for enhancing signal processing in light-processing systems, thus supporting their application in space analytics.
Using special ac current sensors, it was shown that short-circuit protection of the latest CoolSiC™ MOSFET technology is possible. This simplifies the use of CoolSiC™ MOSFETs in applications such as industrial drives, where a certain robustness against short circuits is required. The use of CoolSiC™ MOSFETs leads to a more efficient drive inverter, which can help to reduce the energy costs over lifetime. In addition, the CoolSiC™ MOSFET enables inverter integration into the motor, which is challenging with state-of-the-art IGBTs. Furthermore, fast short-circuit protection can also help to increase the efficiency of an IGBT-based inverter by increasing the gate voltage.
The collaborative effort between SAXOGY® and Hannover University of Applied Sciences has resulted in the development of an advanced modular dv/dt pulse generator. This innovative testbench represents a significant leap forward in accelerated insulation endurance testing. It offers a valuable tool for validating existing and developing new insulation systems, thereby contributing to the enhancement of future power electronic systems.
In industrial production facilities, technical Energy Management Systems are used to measure, monitor and display energy consumption related information. The measurements take place at the field device level of the automation pyramid. The measured values are recorded and processed at the control level. The functionalities to monitor and display energy data are located at the MES level of the automation pyramid. So the energy data from all PLCs has to be aggregated, structured and provided for higher level systems. This contribution introduces a concept for an Energy Data Aggregation Layer, which provides the functionality described above. For the implementation of this Energy Data Aggregation Layer, a combination of AutomationML and OPC UA is used.
Betreiber von Produktionsanlagen stehen oft vor der Frage, welche Norm für die Absicherung der Anlage gegen Cyberangriffe heranzuziehen ist. Aus dem IT-Bereich ist die Normreihe ISO 27000 bekannt. Im Produktionsbereich wird häufig die Normreihe IEC 62443 herangezogen. Dieser Beitrag gibt einen Überblick über beide Normreihen und schlägt einen Ansatz zur gemeinsamen Nutzung beider Standards vor.
