A comparative safety assessment for direct current and direct current with hybrid supply power systems in a windfarm service operation vessel using system- theoretic process analysis

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Abstract

As windfarms are moving further offshore, their maintenance has to be supported by the new generation Service Operation Vessels (SOV) with Dynamic Positioning capabilities. For the SOV safe operations it is crucial that any hazardous scenario is properly controlled. Whilst international regulations require the implementation of Failure Modes and Effects Analysis (FMEA) for SOV power systems, FMEA has been criticised for not addressing properly failures in control systems. In this study, System-Theoretic Process Analysis (STPA) is employed for identifying the hazardous scenarios in terms of Unsafe Control Actions (UCAs) in Direct Current (DC) and DC with batteries power systems. Then the identified UCAs are ranked based on their risk. The results demonstrate that the number of hazardous scenarios derived by the STPA increases in a power system with batteries in comparison to a conventional DC power system, thus depicting higher complexity of this system. However, the increase in overall risk is small and within acceptable limits, whilst the risk reduces for a number of UCAs leading to Diesel Generator overload sub-hazard.
Original languageEnglish
Number of pages16
Publication statusPublished - 18 Sept 2019
EventEuropean STAMP Workshop & Conference - Espoo, Finland
Duration: 18 Sept 201920 Sept 2019
Conference number: 7
https://www.aalto.fi/en/events/issaveswc-2019

Conference

ConferenceEuropean STAMP Workshop & Conference
Abbreviated titleESWC
Country/TerritoryFinland
CityEspoo
Period18/09/1920/09/19
Internet address

Keywords

  • windfarm service operation vessels
  • safety
  • blackouts
  • diesel-electric propulsion
  • hybrid diesel-electric propulsion

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