NDLI: H-bridge modular multi-level converter: control strategy for improved DC fault ride-through capability without converter blocking

Content Provider	IET Digital Library
Author	Chen, Chao Adam, Grain Philip Finney, Stephen J. Fletcher, John E. Williams, Barry W.
Abstract	This study presents a control scheme that separates control of the fundamental current associated with AC power control from the DC and harmonic components in the arms of the H-bridge modular multi-level converter (MMC). In addition, this control scheme fully exploits the subtractive and additive switch states of the H-bridge MMC to maintain capacitor voltage balance when the converter DC-link voltage collapses during DC faults. The significance of this control scheme is that it permits the H-bridge MMC to ride through DC faults without the need for converter blocking, as is presented in the literature. This study provides comprehensive discussion of MMC fundamental theory, including a logical mathematical derivation of the relationships that governed its operation and modulation. The validity of the presented control scheme is confirmed using simulations and experimentations. Besides DC fault survival, this study presents operating the H-bridge-MMC from bi-polar DC-link voltages; thus, creating the possibility of complex hybrid DC grids with reversible DC-link voltage where the conventional line commutated current-source converters can operate alongside voltage-source converters. Operation of the H-bridge-MMC with reversible DC-link voltage is validated using simulation.
Starting Page	1996
Ending Page	2008
Page Count	13
ISSN	17554535
Volume Number	8
e-ISSN	17554543
Issue Number	Issue 10, Oct (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/8/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2014.0513
Journal	IET Power Electronics
Publisher Date	2015-08-03
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC Power Control Bipolar DC-link Voltage Control of Electric Power System Converter DC-link Voltage D.C. Transmission DC Fault Ride-through Capability DC Transmission Network H-bridge MMC H-bridge Modular Multi-level Converter Power And Energy Control Power Control Power Converter Power Supplies to Apparatus Power Transmission Control Power Transmission Fault Reversible DC-link Voltage
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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