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An arrangement for supplying electric power to a plurality of subsea consumers

IP.com Disclosure Number: IPCOM000247693D
Publication Date: 2016-Sep-27
Document File: 11 page(s) / 60K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present disclosure relates to an arrangement for supplying electric power in the form of low or medium voltage AC power of different fre-quencies and voltage levels to a plurality of subsea consumers, said ar-rangement being configured to be connected to a high or medium AC voltage power supply, as well as a method as further described in this disclosure.

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An arrangement for supplying electric power to a plurality of subsea consumers

TECHNICAL FIELD OF THE DISCLOSURE

The present disclosure relates to an arrangement for supplying electric power in the form of low or medium voltage AC power of different frequencies and voltage levels to a plurality of subsea consumers, said arrangement being configured to be connected to a high or medium AC voltage power supply, as well as a method as further described in this disclosure.

Said high or medium AC voltage power supply may be of any conceivable type suitable to feed a said arrangement with high or medium voltage AC power, and this power supply may for example have a transformer connected to a subsea high or medium voltage cable from a power station on shore or from an existing platform located at sea in an off-shore oil and/or gas field.

Said subsea consumers to be fed by a power of variable frequency and voltage level belong to subsea rotating equipment and are for example different types of subsea electric motors, such as for driving impellers of subsea pumps or compressors.

BACKGROUND ART

Known arrangements of the type defined above normally use a rectifier connected to said high or medium AC voltage power supply and connected to the output of this rectifier a Variable Frequency Converter (VFC), including an inverter per said consumer for providing this with an AC voltage of variable frequency and voltage level. Such an arrangement will in a situation with a large number of electric power consumers each requiring a supply of power of variable frequency and voltage level result in a large number of said Variable Frequency Converters. This will consequently require a lot of space and weight, which is a limiting factor in particular for subsea installations. This problem is especially accentuated in situations where there are a great number of consumers, e.g. electric motors requiring a short distance between the VFC and the respective consumer. The complexity of such an arrangement will also be high due to power electronics that require 1 atm. chamber or pressure tolerant equipment for each VFC challenging the reliability of such an arrangement.

There is of course an ongoing attempt to improve arrangements of this type not at least for saving costs for the construction and operation thereof.

SUMMARY OF THE DISCLOSURE

The object of the present disclosure is to provide an arrangement for supplying electric power in the form of low or medium voltage AC power of different frequencies and voltage levels to a plurality of subsea consumers of the type defined in the introduction being improved in at least some aspect with respect to such arrangements already known.

This object is obtained by providing such an arrangement with the features described in this disclosure.

Thanks to said switching network and the control unit controlling this to connect and disconnect each consumer with respect to the outputs of at least two subsea means, i.e. FFCs (Fixed Frequ...