Comparison of an Interleaved Multi-Branch Inverter and a Four-Level Inverter with Variable Voltage Levels for Emulation of Three-Phase Machines

Fischer, Manuel; Hu, Yang; Ruthardt, Johannes; Ziegler, Philipp; Haarer, Jorg; Roth-Stielow, Jörg

doi:10.1109/ecce47101.2021.9595668

Cited by 4 publications

(1 citation statement)

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“…Another recently proposed concept specifically targeting motor emulation for testing three-phase two-level inverters uses parallel bridge-legs with individual LC output filters to generate four voltage levels, and four AC-switches to alternately connect one voltage level to the emulator's phase terminal [78], [79]. Whereas the concept avoids introducing additional (very small) current ripple as compared to a parallel-interleaved alternative, the hardware effort (number of switches) as well as the control complexity are significantly higher.…”

Section: Multilevel/-cell Digital Amplifiersmentioning

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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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: Multilevel/-cell Digital Amplifiersmentioning

confidence: 99%