A Grid-Connected Capacitor-Tapped Multimodule Converter for HVDC Applications: Operational Concept and Control

In this paper, a dc-ac buck converter is proposed as a grid-side converter in high voltage dc (HVdc) transmission systems for high-power renewable energy source grid integration. The proposed architecture consists of multimodules of half-bridge voltage source converters (HB-VSCs). The dc terminals o...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2018-09, Vol.54 (5), p.5523-5535
Main Authors: Elserougi, Ahmed A., Massoud, Ahmed M., Ahmed, Shehab
Format: Article
Language:English
Subjects:
AC integration
Architecture
Buck converters
capacitor tapped
Capacitors
Computer simulation
Driver circuits
Electric bridges
Electric converters
Electric potential
Electric power transmission
Energy transmission
Gates (circuits)
high voltage dc converters
High voltages
HVDC transmission
Insulated gate bipolar transistors
Modular equipment
multimodule converter
Reactive power
Renewable energy sources
Semiconductor devices
Terminals
Viability
Voltage control
Voltage measurement
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Summary:In this paper, a dc-ac buck converter is proposed as a grid-side converter in high voltage dc (HVdc) transmission systems for high-power renewable energy source grid integration. The proposed architecture consists of multimodules of half-bridge voltage source converters (HB-VSCs). The dc terminals of the HB-VSCs are connected in series across the entire dc link (i.e., capacitor tapped), whereas their ac outputs are connected to multiwinding transformers to provide the three-phase terminals for ac grid integration. The proposed grid-connected capacitor-tapped multimodule converter (CT-MC) architecture, inspired from the HVdc shunt tap proposed by ABB, provides a dc-ac conversion with a relatively moderate voltage rating of semiconductor devices. It also provides operation with a lower number of semiconductor devices, gate driver circuits, voltage sensors, and lower total MVA rating of semiconductor devices (67%) compared with the conventional three-phase HB modular multilevel converter, which positively affects the system cost and reduces the computational burden of the employed controller. In this paper, the operational concept and control of the CT-MC are presented along with a capacitor voltage balancing approach. Simulation results are presented during normal and abnormal conditions to show the viability of the proposed architecture. Finally, a scaled down prototype for the CT-MC is employed to validate the converter operation.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2017.2788398