Abstract
This paper deals with new challenges regarding power quality in ship technology resulting from the novelisation and implementation of IACS (International Association of Classification Societies) rules and requirements. These rules, known as IACS E24 2016/2018, address harmonic distortion for ship electrical distribution systems, including harmonic filters. The reasons for the legislative changes based on a short overview of power quality-related accidents are discussed, after which a brief presentation of the updated IACS rules illustrated by a related DNV GL (Det Norske Veritas Germanischer Lloyd) case study is shown. A key part of this paper includes proposals concerning harmonics and interharmonics, distortion indices and transient disturbances. The aim of these proposals is to unify power quality indices and measurement procedures to maintain effective and comparable criteria for monitoring distortion and establish requirements for ship owners, designers, shipbuilders, classifiers, and crew members of marine objects.
Highlights
This paper focuses on the problem of electrical power quality and its influence on ships and shipping safety
Power quality includes two aspects [1]: continuity of a power supply and appropriate parameters of delivered and used electrical energy. This sequence is important, as electrical energy must first be continuously delivered in an appropriate quantity to the supplied system, and, second, its parameters should be kept within safety ranges
Propulsion drives, PWM drives with active front end (AFE) as variable frequency drives (VFD), and common-mode voltage (CMV) in VFDs
Summary
This paper focuses on the problem of electrical power quality and its influence on ships and shipping safety. Aforementioned disturbances cannot be limited only to these parameters given the distinct features of a ship’s power systems [8,9,10,11,12], which result from the specific technical solutions and operating conditions of these systems, and concern, for example, such issues as generating capacity, the power of singular load versus a single generating set, variable frequency and voltage, the application of large capacity power electronic devices, leading to a wide extension of power quality deterioration, or parallel operation of multiple power sources and a need for load-sharing control Considering these factors, the electric power quality in ship systems should be understood as a set of parameters characterising a process of generation, distribution, and use of electric energy in all operation states of the ship (e.g., manoeuvring, sea voyage, remaining in port, cargo handling, etc.).
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