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

V. Bolbot, R. Puisa, G. Theotokatos, E. Boulougouris, D. Vassalos
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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.
用系统理论过程分析方法对风电场作业船直流与混合供电系统的安全性进行了比较评价
随着风电场向海上移动,其维护必须由具有动态定位功能的新一代服务作业船(SOV)提供支持。对于SOV的安全操作,任何危险情况都得到适当的控制是至关重要的。虽然国际法规要求对SOV电力系统实施故障模式和影响分析(FMEA),但FMEA因未能妥善解决控制系统中的故障而受到批评。本研究采用系统理论过程分析(system - theoretical Process Analysis, STPA)来辨识直流与电池供电系统中不安全控制动作(UCAs)的危险情境。然后根据其风险对已确定的uca进行排名。结果表明,与传统的直流电源系统相比,电池电源系统中由STPA衍生的危险场景数量增加,从而描绘了该系统更高的复杂性。然而,总体风险的增加很小,并且在可接受的范围内,同时风险降低了一些导致柴油发电机过载的uca亚危险。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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