Comparison Between Two-Level and Modular Multilevel Converters in High Voltage Direct Current Systems Under Fault Conditions

The occurrence of faults in multi-terminal high voltage direct current (MTDC) systems is a critical situation for both control and protection systems. For instance, MTDC systems work under large overcurrents during DC faults due to the discharging of capacitors on the DC side and the feeding of AC f...

Full description

Saved in:

Bibliographic Details
Published in:	2021 Workshop on Communication Networks and Power Systems (WCNPS) pp. 1 - 6
Main Authors:	Barra, Mikaela T. M., Santos, Maxwel S., de Souza, Victor R. F. B., Costa, Flavio B., Barros, Luciano S., Liu, Yunting
Format:	Conference Proceeding
Language:	English
Published:	IEEE 18-11-2021
Subjects:	Capacitors Communication networks Conferences Control systems Fault Conditions High-voltage techniques Modular Multilevel Converter Multi- Terminal High Voltage Direct Current Multilevel converters Power systems Two-Level Converter Voltage Margin Control
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	The occurrence of faults in multi-terminal high voltage direct current (MTDC) systems is a critical situation for both control and protection systems. For instance, MTDC systems work under large overcurrents during DC faults due to the discharging of capacitors on the DC side and the feeding of AC fault current to the DC system via the converters' anti-parallel freewheeling diodes, challenging their operation, control, and protection. Therefore, the behavior analysis of MTDC systems based on modular multi-level converter (MMC) when submitted to a critical situation is essential to develop fast and accurate protection systems and control strategies. The main goal of this paper is to present a comparison between a six-level MMC (6L-MMC) and a two-level voltage source converter (2L-VSC) for MTDC systems under DC and AC faults to highlight the main challenges for the control and protection systems, such as DC fault blocking capability, integration of AC and DC systems during different operating conditions, fault propagation, and DC voltage control.
ISSN:	2768-0045
DOI:	10.1109/WCNPS53648.2021.9626296