NDLI: Common-mode voltage injection-based nearest level modulation with loss reduction for modular multilevel converters

Content Provider	IET Digital Library
Author	Zhou, Weihao Dong, Yufei Yang, Heya Li, Wuhua He, Xiangning Hu, Jiabing Yuan, Xiaoming
Abstract	This study focuses on the possibility of modular multilevel converter (MMC) loss optimisation by modulation without any additional circuit, where a common-mode voltage is injected into a nearest level modulator. Owing to the common-mode voltage injection, the proposed modulation strategy increases the fundamental voltage. Therefore, for a given voltage, operation is possible with the submodule (SM) voltage of at least one SM inserted each arm. This reduces the number of SMs required, resulting in reduction of conduction losses and leading to significant cost savings and/or returns on investment for facilities. Furthermore, the injection of common-mode voltage also decreases the total SM transitions, resulting in reduction of switching losses. The proposed modulation strategy is valid under both normal and unbalanced ac fault conditions for MMCs. The common-mode voltage extraction method is provided and its harmonic components are extracted. Then, the SM saving capability of the injection-based nearest level modulation is discussed and the SM saving limit is presented in relation with modulation indexes. The optimisation of both conduction losses and switching losses is analysed. The effectiveness of the proposed modulation strategy under both normal and unbalanced ac fault condition is verified by simulations of a 101-level three-phase MMC in MATLAB/Simulink.
Starting Page	798
Ending Page	806
Page Count	9
ISSN	17521416
Volume Number	10
e-ISSN	17521424
Issue Number	Issue 6, Jul (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/10/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2015.0438
Journal	IET Renewable Power Generation
Publisher Date	2016-07-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	101-level Three-phase MMC Common-mode Voltage Injection Conduction Loss Reduction Fault Diagnosis Harmonic Component MATLAB Simulink Environment MMC Loss Optimisation Modular Multilevel Converter Modulation Indexes Nearest Level Modulation Normal AC Fault Condition Power Converter Power Supplies to Apparatus SM Voltage Submodule Voltage Switching Loss Unbalanced AC Fault Condition Voltage Extraction Method
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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