Validation of the Concept for a Wideband-frequency Grid Impedance based Grid Emulator

Uhl, Robert; Monti, Antonello

doi:10.1109/isie45063.2020.9152239

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…This again represents a hyperbola in the design space, which is pinned to the intersection point of the limits from ( 5) and (6). Note that further criteria such as relating to the output impedance, etc.…”

Section: A Switch-mode Amplifier and Output Filtermentioning

confidence: 99%

“…P OWER amplifiers are a key component of powerhardware-in-the-loop (P-HIL) test environments, where they act as interfaces between a virtual system model (e.g., of a power grid or of a load) and a device under test (DUT, e.g., an inverter stage) [1]. A typical example is the emulation of power grids, including transient phenomena and disturbances (e.g., unbalanced voltages, voltage dips, harmonics) [2]- [4], and possibly also the grid impedance characteristics [5], [6], to facilitate comprehensive testing of grid-connected converters such as PFC rectifiers or PV inverters. The authors of [7] provide an up-to-date overview on grid-emulation concepts.…”

Section: Introductionmentioning

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: A Switch-mode Amplifier and Output Filtermentioning

confidence: 99%