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Fault Protection and Coordinated Controls of Power Flow Controller in a Flexible DC Grid

Conference Paper (2021)
Author(s)

Jianquan Liao (Chongqing University, TU Delft - Electrical Engineering, Mathematics and Computer Science)

Zian Qin (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Pavel Purgat (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Niancheng Zhou (Chongqing University)

Qianggang Wang (Chongqing University)

Pavol Bauer (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Research Group
DC systems, Energy conversion & Storage
DOI related publication
https://doi.org/10.1109/PEMC48073.2021.9432559 Final published version
More Info
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Publication Year
2021
Language
English
Research Group
DC systems, Energy conversion & Storage
Article number
9432559
Pages (from-to)
893-898
ISBN (print)
978-1-7281-5661-3
ISBN (electronic)
978-1-7281-5660-6
Event
2021 IEEE 19th International Power Electronics and Motion Control Conference (PEMC)<br/> (2021-04-25 - 2021-04-29), The Silesian University of Technology, Online Conference/Gliwice, Poland
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195

Abstract

This paper analyses the fault current characteristics of a flexible DC grid with a power flow controller (PFC) and proposes a coordinated control method for suppression of fault currents between the PFC and the DC circuit breaker (DCCB). The equivalent circuits of the PFC during different stages of the DC fault are analyzed. Moreover, the influence of the output voltage of the PFC on the fault current is studied. After that, the current suppression characteristics of the current limiting reactor (CLR) and PFC are investigated. Due to the output voltage of the PFC can be flexibly adjusted during the DC fault, the fault current can be suppressed significantly by adjusting the output voltage of the PFC when the DC fault is detected. This paper adopts a bang-bang control for PFC during the fault. Finally, a simulation model was built in Matlab/Simulink to verify the fault current characteristics of the DC grid containing the PFC, and the coordinated control of the PFC was verified.