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Open AccessArticle

A New Topology of a Fast Proactive Hybrid DC Circuit Breaker for MT-HVDC Grids

1
Electrical and Computer Engineering (ECE) Department, University of Windsor, Windsor, ON N9B 1K3, Canada
2
Electrical and Computer Engineering, Wayne State University, Detroit, MI 48202, USA
*
Author to whom correspondence should be addressed.
Sustainability 2019, 11(16), 4493; https://doi.org/10.3390/su11164493
Received: 26 June 2019 / Revised: 26 July 2019 / Accepted: 14 August 2019 / Published: 19 August 2019
(This article belongs to the Special Issue Integration of AC/DC Microgrids into Power Grids)
One of the major challenges toward the reliable and safe operation of the Multi-Terminal HVDC (MT-HVDC) grids arises from the need for a very fast DC-side protection system to detect, identify, and interrupt the DC faults. Utilizing DC Circuit Breakers (CBs) to isolate the faulty line and using a converter topology to interrupt the DC fault current are the two practical ways to clear the DC fault without causing a large loss of power infeed. This paper presents a new topology of a fast proactive Hybrid DC Circuit Breaker (HDCCB) to isolate the DC faults in MT-HVDC grids in case of fault current interruption, along with lowering the conduction losses and lowering the interruption time. The proposed topology is based on the inverse current injection technique using a diode and a capacitor to enforce the fault current to zero. Also, in case of bidirectional fault current interruption, the diode and capacitor prevent changing their polarities after identifying the direction of fault current, and this can be used to reduce the interruption time accordingly. Different modes of operation of the proposed topology are presented in detail and tested in a simulation-based system. Compared to the conventional DC CB, the proposed topology has increased the breaking current capability, and reduced the interruption time, as well as lowering the on-state switching power losses. To check and verify the performance and efficiency of the proposed topology, a DC-link representing a DC-pole of an MT-HVDC system is simulated and analyzed in the PSCAD/EMTDC environment. The simulation results verify the robustness and effectiveness of the proposed HDCCB in improving the overall performance of MT-HVDC systems and increasing the reliability of the DC grids. View Full-Text
Keywords: DC Circuit Breaker (CB); DC Fault; Hybrid DC Circuit Breaker (HDCCB); Multi-Terminal VSC-HVDC (MT-HVDC) Grids DC Circuit Breaker (CB); DC Fault; Hybrid DC Circuit Breaker (HDCCB); Multi-Terminal VSC-HVDC (MT-HVDC) Grids
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Mohammadi, F.; Nazri, G.-A.; Saif, M. A New Topology of a Fast Proactive Hybrid DC Circuit Breaker for MT-HVDC Grids. Sustainability 2019, 11, 4493.

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