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A subsea converter module for a subsea power system

IP.com Disclosure Number: IPCOM000244592D
Publication Date: 2015-Dec-23
Document File: 11 page(s) / 99K

Publishing Venue

The IP.com Prior Art Database

Abstract

A subsea converter module (1) for a subsea power system has an input (2), an output, an arrangement (3) configured to deliver a direct voltage to a plurality of inverters (5-8) configured to deliver an alter-nating voltage on said output to a subsea consumer (10) of electric power. A control unit (9) is configured to individually control the fre-quency and magnitude of the voltage delivered by each said con-verter (5-8) on the output of the converter module.

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A subsea converter module for a subsea power system

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a subsea converter module for a sub-

sea power system, said converter module having an input, an output, an arrangement configured to deliver a direct voltage to an inverter of the module and a said inverter configured to deliver an alternating volt- age on said output to a subsea consumer of electric power.

Such a subsea power system may receive power in the form of high or medium AC or DC voltage through a subsea cable from a power station onshore, from an existing platform located at sea in an off-shore oil and/or gas field or in any other conceivable way. A said subsea con- sumer may for example belong to different types of subsea electric mo-

tors, such as for driving individually controlled impellers of subsea pumps. A subsea converter module of this type is accordingly designed to deliver an alternating voltage on the output thereof suitable to be used by a said subsea consumer.

BACKGROUND ART

Known subsea converter modules of the type defined above have a said arrangement in the form of a rectifier connected to one said inverter, which is suitable in the case of a few said consumers, especially for

high voltage/high power loads. However, when a said subsea converter module is to be arranged in a subsea power system in the form of a subsea field comprising a number of wells and installations, this will not be particularly convenient, since the subsea power system will in such a case often have to feed a high number of low power/low voltage loads

requiring an equally high number of said converter modules. These con- verter modules will then together result in a considerable cost in this context.

There is of course an ongoing attempt to improve the layout of said

subsea power systems not at least for reducing the costs thereof both

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with respect to construction and operation of such systems without sac- rificing operation reliability of the systems.

   SUMMARY OF THE INVENTION 5

The object of the present invention is to provide a subsea converter module of the type defined in the introduction being improved in at least some aspect with respect to such subsea converter modules already known.

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This object is obtained by providing such a module with the features listed in the characterizing part of appended patent claim 1.

By constructing a subsea converter module in that way a plurality of said subsea consumers may be fed with electric power by one single

converter module and by that the number of such converter modules of a said subsea power system be reduced, which results in a saving of costs, which will be particularly great in the case of a subsea power system comprising a large number of low voltage power consumers. Thanks to said control unit of the module an individual control of the

frequency and/or magnitude of the voltage delivered to each said con- su...