On marine vessel the nature of power quality problems can usually be characterised by the type of variable speed drives (e.g. DC SCR drives and/or VFDs) are being utilised.

The section below serves to provide a basic introduction to both DC drives and VFD related problems, common on marine applications.

• DC Drives.

• Variable Frequency Drives (VFDs).

• Fixed Speed Explosion-proof Motors on Voltages Supplies with Harmonics.

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