NDLI: Hybrid inverter concept for extreme bandwidth high-power AC source

Content Provider	IET Digital Library
Author	Huber, J. E. Kolar, J. W. Pammer, G.
Abstract	A hybrid inverter concept for switch-mode power amplifiers as used, e.g. in power-hardware-in-the-loop testing is proposed. A main converter operating from the supplying DC voltage generates a multilevel output voltage by means of parallel-interleaved operation of several bridge legs and combination of the bridge leg output voltages with coupled inductors into a multilevel waveform. A second, series-connected inverter features a floating DC bus with only a fraction of the main converter's DC voltage, which enables a significantly higher switching frequency. The series inverter compensates the deviation of the main inverter's multilevel output voltage from the reference voltage, whereby pulse-width modulation with sawtooth carriers is employed, and hence defines the effective switching frequency of the hybrid inverter's overall output voltage. This allows for a higher output filter cutoff frequency and ultimately features a significant increase of the full-range system bandwidth, which improves by more than an order of magnitude for the considered 100 kVA example system compared with a conventional approach. Finally, closed-loop circuit simulations verify the high performance of the proposed system.
Starting Page	947
Ending Page	949
Page Count	3
ISSN	00135194
Volume Number	53
e-ISSN	1350911X
Issue Number	Issue 14, Jul (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/53/14
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2017.1064
Journal	Electronics Letters
Publisher Date	2017-05-26
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Amplifiers Closed-loop Circuit Simulations DC Voltage Extreme Bandwidth High-power AC Source Floating DC Bus Hybrid Inverter Concept Multilevel Output Voltage Multilevel Waveform Parallel-interleaved Operation Power Amplifier Power Electronics Power Supply Pulse Width Modulation PWM Invertors Reference Voltage Sawtooth Carriers Supervisory Circuit Switch-mode Power Amplifiers Switched Mode Power Supplies Switching Circuit
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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