NDLI: HVDC shunt tap based on three single-phase half-bridge series-connected MMCs operated under 2L modulation

Content Provider	IET Digital Library
Author	Elserougi, Ahmed A. Massoud, Ahmed Mohamed Ahmed, Shehab
Abstract	In this study, a cost-effective HVDC shunt tap with low-number of relatively low-voltage semiconductor devices and small-sized passive components is proposed. The proposed architecture is based on employing three single-phase half-bridge Modular Multilevel Converters (MMCs), where the DC sides of MMCs are connected in series across the total DC-link voltage. The MMCs are adopted instead of conventional Two-Level Voltage Source Converters (2L-VSCs) to avoid the complications of series connection of Insulated Gate Bipolar Transistors (IGBTs). The involved MMCs in the suggested architecture are operated with the conventional 2L modulation, which results in insignificant arm inductors and Sub-Modules (SMs) capacitances (in range of µH and µF, respectively). This, in turn, affects positively the converter cost and footprint. Each arm of the involved MMCs can be considered as a high-voltage valve of a 2L-VSC. To maintain the balance of SMs capacitors, each arm of the involved (N + 1)-level MMC has an extra SM (a balancing SM) to select N out of N + 1 SMs during the turn-off condition. The operational concept, design, and assessment of the proposed architecture are presented in this study. Simulation results are provided for substantiation of the proposed concept. Finally, a scaled down single-phase prototype is used for experimental validation.
Starting Page	3601
Ending Page	3611
Page Count	11
ISSN	17518687
Volume Number	13
e-ISSN	17518695
Issue Number	Issue 16, Aug (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/13/16
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2018.6424
Journal	IET Generation, Transmission & Distribution
Publisher Date	2019-06-18
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	(N + 1)-level MMC 2L Modulation Arm Inductors Bipolar Transistor Capacitor High-voltage DC Shunt Tap HVDC Power Converter HVDC Shunt Tap Inductor Inductors And Transformer Insulated Gate Bipolar Transistors Insulated Gate Field Effect Transistors Modulation Passive Component Passive Filter Passive Network Semiconductor Device Single-phase Half-bridge Modular Multilevel Converter Single-phase Half-bridge Series-connected MMC SM Capacitances Submodules Capacitances Total DC-link Voltage Transformer And Reactors Two-level Voltage-source Converter
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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