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  • 1.
    Mahmood, Yasser Ahmed
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Ahmadi, Alireza
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Verma, Ajit Kumar
    Department of Electrical Engineering, Indian Institute of Technology, Bombay, International Institute of Information Technology, P-14, Pune Infotech Park, Phase-1, Hinjawadi.
    Evaluation and Selection for Availability Improvement of Frequency Converters in Electrified Railway2014In: International Journal of Power and Energy Systems, ISSN 1078-3466, E-ISSN 1710-2243, Vol. 34, no 4, p. 162-172Article in journal (Refereed)
    Abstract [en]

    Railway traction power supply systems (TPSSs) that work at low frequencies contain frequency converters (FCs) that convert the adequate power from a public grid to a traction grid. Availability and system importance analysis is a key aspect of overall system performance. It identifies the weakest areas of a system and indicates where resources must be invested to achieve maximum improvement. Availability analysis of FC types is crucial to reduce outages of traction power that lead to traffic delays and cancellations due to unavailability of FCs. The aim of this study is to rank FC types on the basis of priority of needs for reliability and maintainability improvement so that the availability can be enhanced. The proposed approach involves collection of outage data by calculating performance measures, and then these measures are compared via a comparative chart. Thereafter, opinions of experts are collected and aggregated through linguistic variables, and the FC types are then identified using analytic hierarchy process. Reliability, availability and maintainability (RAM) have been used as the criteria to identify the FC types. In addition to power sharing, capacity and service factors are considered to be productivity measures. Probabilistic performance indexes are used to measure availability, maintainability and productivity, whereas the mean number of outages is used as a reliability index.

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