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Time-Domain Based Fault Detection in DC Grids

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Fault Analysis and Protection System Design for DC Grids

Part of the book series: Power Systems ((POWSYS))

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Abstract

In this chapter, we will look into the different approach of detecting the dc fault—time-domain methods. There are three different methods to be discussed: overcurrent, rate of change and capacitive discharge. The operation of each method is explained in detail. We obtain the fault signal from the simulation model and apply these methods to evaluate their performance. While they are effective in detecting dc fault, each has their own drawbacks. (1) Overcurrentmethod is only suitable for point-to-point configuration, (2) Rate of change method can be severely affected by signal noise, and (3) Capacitive discharge method requires more signals and computationally extensive.

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Author information

Authors and Affiliations

  1. Department of Electrical, Computer, and Software Engineering, The University of Auckland, Auckland, New Zealand

    Abhisek Ukil

  2. Institute for Infocomm Research, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore

    Yew Ming Yeap

  3. School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

    Kuntal Satpathi

Authors
  1. Abhisek Ukil
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  2. Yew Ming Yeap
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  3. Kuntal Satpathi
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Corresponding author

Correspondence to Abhisek Ukil .

5.1 Electronic supplementary material

Below is the link to the electronic supplementary material.

Supplementary material 1 (zip 308 KB)

Open Problems

Open Problems

5.1

For a given fault in multi-terminal dc system, we are able to see vastly different rate of change of current/voltage at each terminal, with that the faulted line can be identified. To what extent is the dc line too short that the difference becomes insignificant, resulting in detection failure?

5.2

In actual application, the fault current limiting (FCL) inductor will be employed along with the dc circuit breaker. Consequently, the rate of change of current will be far lower than what is seen in the analysis here which does not consider FCL inductor. Can all terminals adopt the same threshold?

5.3

For capacitive discharge method, what are the alternative to Pearson correlation coefficient measuring the similarity between dc current and capacitive discharge current?

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Ukil, A., Yeap, Y.M., Satpathi, K. (2020). Time-Domain Based Fault Detection in DC Grids. In: Fault Analysis and Protection System Design for DC Grids. Power Systems. Springer, Singapore. https://doi.org/10.1007/978-981-15-2977-1_5

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  • DOI: https://doi.org/10.1007/978-981-15-2977-1_5

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-15-2976-4

  • Online ISBN: 978-981-15-2977-1

  • eBook Packages: EnergyEnergy (R0)

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