Analysis and Verification of a Cascaded Advanced AC-Simulator with Non-Linear Loads

Jonke, Peter; Makoschitz, Markus; Biswas, Sumanta; Stöckl, Johannes; Ertl, H.

doi:10.1109/compel49091.2020.9265769

Cited by 3 publications

(3 citation statements)

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“…This concept has recently been applied to a grid simulation system in [137], [138], where a standard 400 V, 5 kVA IGBT inverter is combined with a 100 V MOSFET inverter that is responsible for generating higher-order harmonics. Similarly, [139]- [141] use a three-phase transformer to combine the outputs of a 800 V, 12 A three-phase inverter switching at 20 kHz with a 100 V small-signal inverter operating at 200 kHz. In these examples, the low-frequency output transformer limits the achievable bandwidth, e.g., to 2 kHz in [139]- [141].…”

Section: ) Series Configurationmentioning

confidence: 99%

“…Similarly, [139]- [141] use a three-phase transformer to combine the outputs of a 800 V, 12 A three-phase inverter switching at 20 kHz with a 100 V small-signal inverter operating at 200 kHz. In these examples, the low-frequency output transformer limits the achievable bandwidth, e.g., to 2 kHz in [139]- [141]. The roles of the main amplifier and the transformer-coupled smallsignal stage are clearly separated (generation of fundamental and higher-order harmonics).…”

Section: ) Series Configurationmentioning

confidence: 99%

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Ultra-High-Bandwidth Power Amplifiers: A Technology Overview and Future Prospects

Bohler¹,

Huber²,

Wurz³

et al. 2022

IEEE Access

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Testing of power electronic converters can advantageously be carried out in power-hardwarein-the-loop (P-HIL) environments that emulate the behavior of power grids, electric motors, etc. The interface between the model and the device under test requires a power amplifier whose bandwidth ultimately limits the accuracy of the emulation. Hence, there is a need for general-purpose AC power amplifiers with ultra-high power bandwidth. This paper first provides a comprehensive review of amplifier concepts proposed over the past decades, i.e., linear power amplifiers, switch-mode amplifiers, including advanced variants such as multilevel (parallel-interleaving) and multicell (series-interleaving) topologies, as well as hybrid approaches that, e.g., combine analog and switch-mode stages. Based on this review, the two key concepts (parallelinterleaving of bridge-legs and cascading of converter cells) that facilitate high efficiency and ultra-high power bandwidth are identified and discussed, covering also suitable isolated mains interfaces and control considerations. Finally, we present a three-phase amplifier system that uses six cascaded converter cells per phase to realize an effective switching frequency of 3.6 MHz. The prototype thus achieves a measured power bandwidth of 100 kHz at the nominal phase output voltage of 230 V rms, and an output power of up to 10 kW per phase.INDEX TERMS Power-hardware-in-the-loop (P-HIL), grid emulation, motor emulation, power amplifier topologies, switch-mode power amplifier, ultra-high-bandwidth power amplifier.

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Section: ) Series Configurationmentioning

confidence: 99%

Section: ) Series Configurationmentioning

confidence: 99%

Ultra-High-Bandwidth Power Amplifiers: A Technology Overview and Future Prospects

Bohler¹,

Huber²,

Wurz³

et al. 2022

IEEE Access

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“…Als nichtlineare Last wurde ein ungesteuerter B6 Gleichrichter gewählt da dieser im nichtlückenden Betrieb im Allgemeinen eine höhere Stromanstiegsrate zeigt als z. B. ein B2-Gleichrichter [14].…”

Section: Nichtlineare Last -B6 Diodengleichrichterunclassified

Dreiphasiger Netzsimulator mit virtueller Ausgangsimpedanz

Jonke

Makoschitz

Ertl

2022

Elektrotech. Inftech.

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ZusammenfassungFür das Testen, Prüfen und Validieren von netzgekoppelten Komponenten wie z. B. PV-Wechselrichtern oder Batteriespeichersystemen kommen in der Regel Netzsimulatoren/AC-Simulatoren zum Einsatz, um deren Verhalten bei unterschiedlichen Spannungs- oder Frequenzprofilen zu untersuchen. Bei derartigen Versuchsaufbauten ist auch eine definierte Netzimpedanz vorgeschrieben, welche üblicherweise durch passive ohmsch-induktive RL-Impedanznetzwerke emuliert nachgebildet wird. Als Alternative dazu wird im Rahmen dieser Publikation ein auf virtueller Netzimpedanzemulation basierendes Netzsimulationssystem präsentiert, wodurch auf die genannten Leistungs-Impedanznetzwerke verzichtet werden kann und ein flexiblerer, programmierbarer Testbetrieb möglich ist.

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