Proposal of a series configuration hybrid ac power source

Beltrame, Rafael; Desconzi, M. I.; Rech, Cassiano; Hey, H.L.; Martins, Mário

doi:10.1109/ecce.2011.6064040

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…For example, [50], [115], [116] describe a 130 V rms, 1 kW (single-phase) system consisting of nine cascaded converter cells with equal DC voltages, which achieves a large-signal bandwidth of 10 kHz and, thanks to the linear stage, a very high smallsignal bandwidth of 600 kHz. The 140 V rms, 500 W hybrid amplifier proposed in [47] achieves a similar small-signal bandwidth of 400 kHz, but uses only four cascaded cells that, however, feature unequal DC voltages and thus can realize 19 voltage levels (instead of nine voltage levels achievable with four cells that have equal DC voltages, see Section II-C2). In contrast to most systems discussed in the literature, it is also possible to operate the digital multi-cell amplifier of a hybrid D/A amplifier system not with staircase modulation but with (phase-shifted) PWM [117].…”

Section: ) Series Configurationmentioning

confidence: 99%

“…[35] [37] 2 .5 G H z W FIGURE 1. Large-signal bandwidth (maximum output frequency at nominal voltage) vs. single-phase power (of a single unit, i.e., without paralleling of multiple units) of typical AC power amplifier systems that can generate a single-phase output rms voltage of at least 230 V, as reported in literature by industry [26]- [46] and academia [12]- [14], [38], [47]- [55]. The ultra-high power bandwidth (UH-PBW) amplifier system proposed in this work (see Section IV) is highlighted.…”

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: ) Series Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Bohler¹,

Huber²,

Wurz³

et al. 2022

IEEE Access

View full text Add to dashboard Cite

show abstract

“…Three key modulation techniques are used for SMALA [7–9]. The first technique is PWM combined with an output filter to attenuate the harmonic components.…”

Section: Introductionmentioning

confidence: 99%