A novel protection scheme for an LVDC distribution network with reduced fault levels

Dong Wang, Abdullah Emhemed, Graeme Burt

Research output: Contribution to conferencePaper

5 Citations (Scopus)

Abstract

Low Voltage Direct Current (LVDC) distribution is one of the new promising technologies that have the potential to accelerate the wider integration of distributed renewables. However, adding new power electronics to convert AC to DC will introduce new forms of faults with different characteristics. Converters with inherent fault current limiting and blocking capabilities will significantly limit the fault currents, resulting in significant impacts on the performance of existing LV overcurrent protection schemes. New protection methods based on the change in the DC voltages have been proposed recently by different researches. The issue with these methods is that the protection relays of the un-faulted feeders will also see the same change in the voltage for certain faults, leading to substandard selectivity and unnecessary tripping. This paper investigates these challenges, and presents a novel DC protection method which is based on the use of the combination of two components: the voltage change (dv/dt) and the change of current (di/dt). The new method is mainly developed to detect and locate DC faults with reduced fault current levels within DC distribution networks. The introduced protection concept is tested on an LVDC distribution network example using PSCAD/EMTDC simulation tool.

Conference

ConferenceThe 2nd International Conference on DC Microgrids (ICDCM2017)
Abbreviated titleICDCM
CountryGermany
CityNurnberg
Period27/06/1729/06/17
Internet address

Fingerprint

Electric power distribution
Electric fault currents
Electric potential
Overcurrent protection
Relay protection
Power electronics

Keywords

  • DC protection
  • modular multilevel converter
  • LVDC distribution systems

Cite this

Wang, D., Emhemed, A., & Burt, G. (2017). A novel protection scheme for an LVDC distribution network with reduced fault levels. Paper presented at The 2nd International Conference on DC Microgrids (ICDCM2017), Nurnberg, Germany.
Wang, Dong ; Emhemed, Abdullah ; Burt, Graeme. / A novel protection scheme for an LVDC distribution network with reduced fault levels. Paper presented at The 2nd International Conference on DC Microgrids (ICDCM2017), Nurnberg, Germany.
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abstract = "Low Voltage Direct Current (LVDC) distribution is one of the new promising technologies that have the potential to accelerate the wider integration of distributed renewables. However, adding new power electronics to convert AC to DC will introduce new forms of faults with different characteristics. Converters with inherent fault current limiting and blocking capabilities will significantly limit the fault currents, resulting in significant impacts on the performance of existing LV overcurrent protection schemes. New protection methods based on the change in the DC voltages have been proposed recently by different researches. The issue with these methods is that the protection relays of the un-faulted feeders will also see the same change in the voltage for certain faults, leading to substandard selectivity and unnecessary tripping. This paper investigates these challenges, and presents a novel DC protection method which is based on the use of the combination of two components: the voltage change (dv/dt) and the change of current (di/dt). The new method is mainly developed to detect and locate DC faults with reduced fault current levels within DC distribution networks. The introduced protection concept is tested on an LVDC distribution network example using PSCAD/EMTDC simulation tool.",
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Wang, D, Emhemed, A & Burt, G 2017, 'A novel protection scheme for an LVDC distribution network with reduced fault levels' Paper presented at The 2nd International Conference on DC Microgrids (ICDCM2017), Nurnberg, Germany, 27/06/17 - 29/06/17, .

A novel protection scheme for an LVDC distribution network with reduced fault levels. / Wang, Dong; Emhemed, Abdullah; Burt, Graeme.

2017. Paper presented at The 2nd International Conference on DC Microgrids (ICDCM2017), Nurnberg, Germany.

Research output: Contribution to conferencePaper

TY - CONF

T1 - A novel protection scheme for an LVDC distribution network with reduced fault levels

AU - Wang, Dong

AU - Emhemed, Abdullah

AU - Burt, Graeme

N1 - (c) 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.

PY - 2017/6/29

Y1 - 2017/6/29

N2 - Low Voltage Direct Current (LVDC) distribution is one of the new promising technologies that have the potential to accelerate the wider integration of distributed renewables. However, adding new power electronics to convert AC to DC will introduce new forms of faults with different characteristics. Converters with inherent fault current limiting and blocking capabilities will significantly limit the fault currents, resulting in significant impacts on the performance of existing LV overcurrent protection schemes. New protection methods based on the change in the DC voltages have been proposed recently by different researches. The issue with these methods is that the protection relays of the un-faulted feeders will also see the same change in the voltage for certain faults, leading to substandard selectivity and unnecessary tripping. This paper investigates these challenges, and presents a novel DC protection method which is based on the use of the combination of two components: the voltage change (dv/dt) and the change of current (di/dt). The new method is mainly developed to detect and locate DC faults with reduced fault current levels within DC distribution networks. The introduced protection concept is tested on an LVDC distribution network example using PSCAD/EMTDC simulation tool.

AB - Low Voltage Direct Current (LVDC) distribution is one of the new promising technologies that have the potential to accelerate the wider integration of distributed renewables. However, adding new power electronics to convert AC to DC will introduce new forms of faults with different characteristics. Converters with inherent fault current limiting and blocking capabilities will significantly limit the fault currents, resulting in significant impacts on the performance of existing LV overcurrent protection schemes. New protection methods based on the change in the DC voltages have been proposed recently by different researches. The issue with these methods is that the protection relays of the un-faulted feeders will also see the same change in the voltage for certain faults, leading to substandard selectivity and unnecessary tripping. This paper investigates these challenges, and presents a novel DC protection method which is based on the use of the combination of two components: the voltage change (dv/dt) and the change of current (di/dt). The new method is mainly developed to detect and locate DC faults with reduced fault current levels within DC distribution networks. The introduced protection concept is tested on an LVDC distribution network example using PSCAD/EMTDC simulation tool.

KW - DC protection

KW - modular multilevel converter

KW - LVDC distribution systems

M3 - Paper

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Wang D, Emhemed A, Burt G. A novel protection scheme for an LVDC distribution network with reduced fault levels. 2017. Paper presented at The 2nd International Conference on DC Microgrids (ICDCM2017), Nurnberg, Germany.