Abstract
Ship power systems are characterised by a comparatively high level of various power quality disturbances, such as voltage deviations, frequency deviations, voltage waveform distortions and sometimes voltage unbalance, which exert a detrimental effect on energy receivers. Among other things, power quality disturbances may cause an extraordinary increase in power losses occurring in on-board induction motors as well as ineffective utilisation of their mechanical output power. In this study, the results of empirical research which demonstrates how power quality disturbances in real ship microgrids affect induction motors are shown. The results of power quality monitoring in ship power systems from the point of view of the energy-efficient operation of induction motors are presented for various vessels and operating conditions. Recommendations concerning the revision of power quality standards and rules are elaborated to provide more energy-efficient ship operation.
Highlights
Ship power systems are characterised by specific technical solutions and operating conditions [1]-[7] leading to a high level of power quality (PQ) disturbances, such as voltage and frequency deviations, voltage waveform distortions and voltage unbalance
The cvee coefficient is a synthetic PQ factor, whose value is proportional to power losses occurring in induction motors due to PQ disturbances
The coefficient of voltage energy efficiency is a synthetic power quality factor, whose value is proportional to power losses occurring in induction motors under power quality disturbances
Summary
Ship power systems are characterised by specific technical solutions and operating conditions [1]-[7] leading to a high level of power quality (PQ) disturbances, such as voltage and frequency deviations, voltage waveform distortions and voltage unbalance. An increase in power losses in induction motors due to PQ disturbances is reflected by the value of the cvee coefficient [16]. It is worth mentioning that the increase in mechanical output power due to PQ disturbances significantly affects ohmic power losses in a motor, and is reflected by the value of the coefficient of voltage energy efficiency [16].
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