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Arrangement for supplying electric power

IP.com Disclosure Number: IPCOM000244824D
Publication Date: 2016-Jan-19

Publishing Venue

The IP.com Prior Art Database

Abstract

An arrangement for supplying a rated low voltage AC power to sub-sea control system devices is configured to be connected to a sub-sea high or medium AC voltage distribution line (2, 15) connected to a topside high or medium voltage AC power supply through topside means (3, 16) configured to provide said line with a high or medium AC voltage of variable frequency and/or variable voltage level for feeding subsea rotating equipment (4, 17). The arrangement has a subsea step down transformer (5, 13) connected to said line (2, 15) and configured to transform said voltage thereof to a low voltage level, a rectifier (7, 18) connected to an output of the transformer and configured to deliver a low DC voltage to an input of an inverter (9, 20) configured to deliver a low voltage AC power with rated volt-age and frequency.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 18% of the total text.

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278484A

Arrangement for supplying electric power

TECHNICAL FIELD OF THE INVENTION

The present invention relates to an arrangement for supplying electric

power in the form of rated low voltage AC power to subsea control system devices.

Such subsea control system devices are used for controlling the oper- ation of different types of subsea processing equipment in a subsea

oil and/or gas field, for example subsea rotating equipment, such as pumps and compressors. Such an arrangement may also at the same time be used to supply rated low voltage AC power to electric valve actuators, small auxiliary pumps, subsea control modules, active magnetic bearing control systems, communication systems etc. in

subsea processing systems having such subsea pumps and compres- sors.

   BACKGROUND ART 20

Known arrangements of this type comprise a low voltage control pow- er umbilical dedicated for supplying said rated low voltage AC power or low voltage control power lines/conductors within the high voltage umbilical/power cable for subsea rotating equipment, which has to have a rated voltage and frequency.

There are of course an ongoing attempt to improve arrangements of this type, especially for saving costs for the construction and opera- tion thereof.

SUMMARY OF THE INVENTION

The object of the present invention is to provide an arrangement of the type defined in the introduction being improved in at least some aspect with respect to such arrangements already known.

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278484A

This object is obtained by providing such an arrangement with the fea- tures listed in the characterizing part of appended patent claim 1.

The present invention is based on using power components already there for providing said subsea rotating equipment with power for ob-

taining said rated low voltage AC power to be supplied to subsea con- trol system devices. Said rotating equipment is to be fed with a high or medium AC voltage of variable frequency and/or variable voltage lev- el, which means that said topside means may comprise a so-called Variable Speed Drive (VSD).The construction of the arrangement ac-

cording to the present invention allows to use the power fed from such a VSD to said subsea rotating equipment to provide said rated low voltage AC power with a rated voltage and frequency to subsea con- trol system devices. Thus, no dedicated said low voltage control pow- er lines/conductors in controls umbilical or low voltage control power

lines/conductors within the high voltage power umbilical/cable are necessary for this, so that a substantial cost reduction of subsea sys- tems to which said equipment belongs may be obtained by avoiding said controls power umbilical lines/conductors for a subsea pro- cessing station.

According to an embodiment of the invention said arrangement com- prises at least one energy storage device, such as battery or capaci- tor, connected between an output of said rectifier and an input of said inverter in paral...