NDLI: Combined DC-Filter and optimized Modulation to Absorb DC-Link Oscillations of Cascaded H-Bridge Converters

Content Provider	IEEE Xplore Digital Library
Author	Tavakoli Bina, M. Eskandari, B.
Copyright Year	2007
Description	Author affiliation: K.N. Toosi Univ. of Technol., Tehran (Tavakoli Bina, M.; Eskandari, B.)
Abstract	Cascaded H-bridge converters can be employed suitably for applications that need higher voltages, avoiding series connection of semiconductor switches. However, DC-link oscillations are a practical issue when converters operate under three-phase unbalance condition and/or single phase operation. Resultant low frequency oscillations would affect the harmonic performance as well as efficiency of the converter. This paper proposes four various external DC active filter circuits, aiming at cancelling these oscillations. Proposed circuits are simulated, and their performances on compensation of oscillations are compared to select the best choice. Furthermore, an optimized switching pulse train is developed to attenuate the harmonics objectively. The solution is then combined with the selected DC active filter circuit to limit the peak of the oscillations. The combined method can be applied to modular AC-AC multilevel converter as an application of the suggested technique. Simulation results confirm that the combined method limits the DC-link oscillations of cascaded H-bridges more suitably compared to other proposed circuits, and can be employed for single-phase applications as well as unbalanced three-phase systems.
Starting Page	860
Ending Page	864
File Size	2965083
Page Count	5
File Format	PDF
ISBN	9781424406449
DOI	10.1109/PEDS.2007.4487805
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-11-27
Publisher Place	Thailand
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage Active filters Power harmonic filters Circuit simulation Capacitors Switches Frequency conversion Switching converters Power system harmonics Pulse power systems optimized modulation Active DC-filter cascaded converters DC-link oscillations combinatorial minimization
Content Type	Text
Resource Type	Article

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