| dc.description.abstract | Harmonic voltage distortion is a problem becoming more and more common in maritime power systems because of the increasing use of power electronics; especially in relation to VFDs. To avoid the possibility of damage and malfunction of the components in the power system international standards and regulative organs like DNV, ABS and Bureau Veritas has defined limits for the harmonic distortion levels in the maritime power system.
This study is conducted to design a measurement system for harmonics, suitable for measurements in an offshore and maritime power system environment. The measurement system then has to be small and portable, and the requirements in the international standards IEC 61000-4-7 and IEC 61000-4-30 should be met to obtain reliable results from the measurements. The chosen measurement system is the compactDAQ system delivered by National Instruments, with processing of the measurements handled by LabVIEW, a programmable software for analysis, also delivered by National Instruments.
For the sake of interest, a method for identification of the harmonic contribution from different loads connected to the power system is proposed and applied for further analysis of the results obtained from the measurement system tests. The method tested in the study is the harmonic voltage component method. This method is applied for both voltage and current measurement analysis.
An active harmonic filter is suggested for mitigation of harmonic distortion. This filter is connected to the laboratory test system used in the study to verify the filtering effect of the filter.
All the testing is conducted on a laboratory test system. Four configurations are defined to achieve variable harmonic levels for various testing | |
