DC Transmission Grid with Low Speed Protection using Mechanical DC Circuit Breakers

Masood Hajian Foroushani; Lu Zhang; Dragan Jovcic

doi:10.1109/TPWRD.2014.2371618

DC Transmission Grid with Low Speed Protection using Mechanical DC Circuit Breakers

Masood Hajian Foroushani, Lu Zhang, Dragan Jovcic

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Abstract

This paper introduces a DC transmission grid with fault tolerant inductor-capacitor-inductor (LCL) voltage source converters (VSCs) and using slow protection system based on mechanical DC circuit breakers (CBs). LCL VSC inherently regulates DC fault current to levels that converter can sustain for prolonged periods which avoids IGBT tripping and brings significant advantage in security and reliability aspects. Simple mechanical DC CBs are used at DC bus bars and connecting points of each DC cable, in the same manner as it is normal practice used with AC transmission protection. The protection logic is based on differential methods which gives excellent selectivity and reliability. The fault clearing time is in the order of 30-60ms which allows for reliable protection decision making. The simulation results obtained from a four-terminal DC grid modeled on PSCAD platform confirm successful DC fault isolation and grid recovery for a range of severe DC fault scenarios.

Original language	English
Pages (from-to)	1383-1391
Number of pages	9
Journal	IEEE Transactions on Power Delivery
Volume	30
Issue number	3
Early online date	20 Nov 2014
DOIs	https://doi.org/10.1109/TPWRD.2014.2371618
Publication status	Published - 2015

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10.13039/501100000266-Engineering and Physical Sciences Research Council

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Dragan Jovcic
- Engineering, Aberdeen HVDC Research Centre
- Centre for Energy Transition
- Engineering, Engineering - Chair in Engineering
Person: Academic

Cite this

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title = "DC Transmission Grid with Low Speed Protection using Mechanical DC Circuit Breakers",

abstract = "This paper introduces a DC transmission grid with fault tolerant inductor-capacitor-inductor (LCL) voltage source converters (VSCs) and using slow protection system based on mechanical DC circuit breakers (CBs). LCL VSC inherently regulates DC fault current to levels that converter can sustain for prolonged periods which avoids IGBT tripping and brings significant advantage in security and reliability aspects. Simple mechanical DC CBs are used at DC bus bars and connecting points of each DC cable, in the same manner as it is normal practice used with AC transmission protection. The protection logic is based on differential methods which gives excellent selectivity and reliability. The fault clearing time is in the order of 30-60ms which allows for reliable protection decision making. The simulation results obtained from a four-terminal DC grid modeled on PSCAD platform confirm successful DC fault isolation and grid recovery for a range of severe DC fault scenarios.",

author = "{Hajian Foroushani}, Masood and Lu Zhang and Dragan Jovcic",

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AU - Hajian Foroushani, Masood

AU - Zhang, Lu

AU - Jovcic, Dragan

N1 - 10.13039/501100000266-Engineering and Physical Sciences Research Council

PY - 2015

Y1 - 2015

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AB - This paper introduces a DC transmission grid with fault tolerant inductor-capacitor-inductor (LCL) voltage source converters (VSCs) and using slow protection system based on mechanical DC circuit breakers (CBs). LCL VSC inherently regulates DC fault current to levels that converter can sustain for prolonged periods which avoids IGBT tripping and brings significant advantage in security and reliability aspects. Simple mechanical DC CBs are used at DC bus bars and connecting points of each DC cable, in the same manner as it is normal practice used with AC transmission protection. The protection logic is based on differential methods which gives excellent selectivity and reliability. The fault clearing time is in the order of 30-60ms which allows for reliable protection decision making. The simulation results obtained from a four-terminal DC grid modeled on PSCAD platform confirm successful DC fault isolation and grid recovery for a range of severe DC fault scenarios.

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DO - 10.1109/TPWRD.2014.2371618

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JO - IEEE Transactions on Power Delivery

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DC Transmission Grid with Low Speed Protection using Mechanical DC Circuit Breakers

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Dragan Jovcic

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