JP6162086B2 - Floating offshore facility and power supply method for floating offshore facility - Google Patents

Description

  The present invention relates to a floating offshore facility and a power supply method for a floating offshore facility, and more specifically, a space for installing a power generation device on an upper deck can be greatly reduced, The present invention relates to a floating offshore facility and a method of supplying power to the floating offshore facility, which can significantly increase the space for production and storage as an offshore facility.

  FPSO (floating production storage and loading equipment) equipped with oil and gas production facilities and kept at a specific offshore installation location for a long period of time, FSO (floating bodies) without oil and gas production facilities Floating offshore facilities such as floating storage and loading facilities), FSU (floating storage facilities), and FLNG (liquefied storage and loading facilities) that handle LNG float while being held in place by mooring or automatic position holding devices, etc. In this state, production activities and products are temporarily stored.

  The construction of these floating offshore facilities is mainly done by remodeling existing VLCCs (large tankers), but recently there have been cases where new offshore facilities have been built. Even new cases are designed and built based on the VLCC design.

  In constructing this floating offshore facility, if a new ship does not have its own transportation means, it will be necessary to tow to the production site or to transport it by a heavy transport ship. Therefore, when long-distance movement occurs, for example, when a floating offshore facility is constructed in Asia and installed in Brazil, the initial transfer cost is very high.

  Therefore, when the propulsion system is made the same as that of the VLCC, as shown in FIG. 7, most of the engine room 5X is made up of propulsion engine-related equipment such as the main engine 40 where diesel engines are frequently used and power required for navigation. 2 to 3 diesel generators 41, etc. for generating power are occupied, but this propulsion function and the power generator 41 for navigation are used only when moving from the factory or the port to the oil field. It is not required during operation of the floating offshore facility 1X. Therefore, because the space (shaded hatched portion) of the engine room 5X is large in the propulsion engine-related equipment and the power generation device 41 that are not used while the production facility 30 is in operation, the production arranged below the upper deck There is a problem that the space of the cargo hold 6 for storing goods is reduced, and the portion below the upper deck 3 is not effectively used.

  In the floating offshore facility 1X, a power generation device group including a production facility 30 and, for example, a power generation device 31 for driving the production facility 30 is disposed on the upper deck 3. In this power generator group, about 2 to 8 gas turbine generators (3 in FIG. 7 × 6 in 2 horizontal rows) are installed on the upper deck 3 which requires a smaller installation area than the diesel generator. It is formed by that. Therefore, there exists a problem that the space which arrange | positions the production equipment 30 becomes small.

  Furthermore, a gas turbine generator that uses a relatively small space to reduce the space occupied by the power generation device on the upper deck is used for power generation in production facilities. There is also a problem that the energy efficiency is worse than that of a diesel generator that is tall and uses a relatively large space, and there is room for improvement in terms of fuel consumption and energy saving.

  On the other hand, as a ship propulsion system, instead of directly driving a propeller propeller by an internal combustion engine, an electric propulsion ship that supplies electricity generated by a generator to the motor and drives the propeller for propulsion by this motor is developed. The electric propulsion ship has a plurality of generators, a low-frequency circuit connecting the propulsion motor and the generator, and a normal circuit connected to the low-frequency circuit via a frequency and voltage converter. There has been proposed an electric propulsion ship that improves the volumetric efficiency in the engine room and improves the fuel efficiency during navigation by controlling the frequency of the alternating current generated by the engine to be smaller than 50 Hz (for example, , See Patent Document 1).

  In addition, the generator and the propulsion motor are formed of permanent magnet type synchronous machines having substantially the same operating characteristics, and these synchronous machines are directly connected to each other by fixed electrical connection, so that the rotation speed of the propeller can be controlled by power electronics. There has also been proposed a propulsion system for ships and movable marine structures that can be changed without the use of gears and reduced without gears, reducing investment and space requirements (see, for example, Patent Document 2).

  However, in these electric propulsion vessels, ships, and propulsion systems for movable marine structures, no mention is made of the problem of the space of the power generators arranged on the upper deck in the floating offshore facility.

JP 2013-43485 A Special table 2007-504045 gazette

  In view of the above situation, the present inventors have considered an engine rather than a propulsion system that drives a propulsion unit with a main engine such as a conventional diesel engine for a floating offshore facility that does not require a propulsion function when the production facility is in operation. By combining an electric propulsion system that can reduce the size of a room with a group of power generation devices for operating production facilities, the engine room can be made smaller, the cargo hold can be increased, and the power generation device group installed on the deck A part of the power generation system can be shared with the electric propulsion system, and the power generation equipment that is also used in the engine room can reduce the space for the power generation equipment group arranged on the upper deck and increase the space for production equipment. And gained knowledge.

  The purpose of the present invention is to use a floating offshore facility for a voyage from a factory or a port to a place where it is installed offshore. An object of the present invention is to provide a floating offshore facility that can be reduced and can significantly increase the space for production facilities and storage for cargo storage as an offshore facility, and a power supply method for the floating offshore facility. .

  The floating offshore facility of the present invention for achieving the above object comprises a production facility to which power is supplied by a plurality of power generators, and the floating offshore facility is used while being held on the ocean. The propulsion system for moving the floating offshore facility is composed of an electric propulsion system that drives a propulsion device with an electric motor, and the first group of the power generation devices are arranged on the upper deck, and the second group of the power generation devices is an engine. The electric power for operating the production facility provided in the floating offshore facility is supplied by the power generators of both the first group and the second group, and the motor is driven. Power is configured to be supplied by the power generators of the second group.

  According to this configuration, even if the second group of the power generation device group is provided in the engine room, the propulsion system for moving the floating offshore facility is configured by the electric propulsion system that drives the propulsion device with the electric motor, thereby The space of the entire engine room can be made smaller than when a propulsion system that directly drives the propulsion unit by the engine is adopted, and the space of the cargo hold disposed below the upper deck can be increased. .

  In addition, by providing the engine room with the second group of power generators that supply power to the production facility, the number of power generators of the first group of power generators on the upper deck can be reduced. In addition, the space occupied by the power generation device group on the upper deck can be reduced, and the space for production equipment can be increased.

  Furthermore, since initial navigation devices such as electric propulsion devices, propulsion control devices, and navigation facilities that are temporarily required for navigation from the construction site to the installation site of floating production facilities are installed, navigation costs can be reduced. It becomes possible. In addition, since the power necessary for the navigation is generated by the power generation device of the second group of the power generation device group used when the production facility is in operation, it is not necessary to provide a power generation device that is used only during the navigation. In particular, when the floating production facility includes a large-scale power generation system of 100 MW class, it is possible to sufficiently cover the electric power used by the electric propulsion system during navigation.

  Therefore, since a part of the large-scale power generation system equipped on the upper deck in the prior art is installed in the engine room, the space above the upper deck where the production equipment is installed can be used more widely. In addition, the investment cost of the initial mobile device can be suppressed, and the self-navigation cost can be reduced.

  In terms of power supply control, it is preferable to use the same type of generator and the same capacity as the generator. Regarding the arrangement of the radix of the generator, the first group is four and the second group is two. This is preferable from the viewpoint of power consumption during navigation.

  It is also conceivable to use part or all of the first group of power generators arranged on the upper deck to supply the electric power used by the electric propulsion system during navigation. Considering the process, after the electric propulsion system and the second group of power generators are arranged in the engine room, the first group of power generators on the upper deck may be arranged. Since it is not always possible to install and operate one group of power generators, it is preferable to supply power to the electric propulsion system with the second group of power generators.

  In addition, the present invention, in other words, it is preferable to make the space of the power generation device group disposed on the upper deck as small as possible in order to secure the space for the production equipment disposed on the upper deck. With careful consideration, the power generator group is divided into two groups, one of the second group of power generators is moved into the engine room, and the engine is moved along with the movement of the power generator into the engine room. If the space in the room increases, the space in the cargo hold below the upper deck will decrease, so the combination with the electric propulsion system will reduce the space in the engine room and Is replaced with the power generator of the second group to simplify the equipment configuration in the engine room and further reduce the space in the engine room and expand the space in the cargo hold. That.

  In the above floating offshore facility, if at least a part or all of the power generator is configured with a diesel generator, the propulsion shaft, the motor, the power generator, the propulsion control, and the like in the engine room even when the electric propulsion system is adopted. It is necessary to secure a space for arranging the devices, etc., and the space for this electric propulsion system is smaller than the case where a propulsion system that directly rotates the propulsion unit is used in an internal combustion engine. Since the space which can be arrange | positioned can be ensured easily, a fuel consumption can be improved rather than the case where a gas turbine generator is employ | adopted.

  In the above floating offshore facility, when the rotational speed control of the propulsion unit of the electric propulsion system is performed by an inverter and the inverter is also used for the transfer speed control of the cargo pump, the expensive inverter is replaced with the initial movement. Since it can be used for the transfer of products, the inverter can be used efficiently, and the equipment cost as a whole can be reduced. In other words, in the prior art, the cargo pump is configured to be driven by steam generated in the boiler. However, if there is an inverter used for initial movement, this inverter can be used as an initial movement or by switching the inverter. The cargo pump can be switched to electric drive at low cost by using it for both operation of production facilities. By adopting the electrification of this cargo pump, it is possible to contribute to a reduction in fuel costs as compared to the conventional steam turbine driven cargo pump.

  And the electric power supply method of the floating offshore facility for achieving the above-mentioned object comprises a production facility to which electric power is supplied by a plurality of power generators, and the floating offshore facility to be used while being held on the ocean. In the power supply method, the electric power for operating the production facility provided in the floating offshore facility is supplied by the first group of power generators disposed on the upper deck and the second group of power generators disposed in the engine room. The electric power for driving the electric motor of the electric propulsion system for moving the floating offshore facility is supplied by the power generator of the second group.

  According to this method, the power supply to the production equipment on the upper deck is performed by the first group of generators on the upper deck and the second group of generators installed in the engine room. It is possible to reduce the number of power generators arranged on the top, and to use the upper deck on which production equipment is installed more widely. In addition, during the initial movement, power is supplied to the motor of the electric propulsion system by the second group of power generation devices, so that the investment cost for the initial movement device can be suppressed and the self-propulsion cost can be reduced.

  According to the floating offshore facility and the power supply method for the floating offshore facility according to the present invention, the propulsion system used in the voyage from the manufacturing site or the port to the offshore installation location is constituted by an electric propulsion system. It is possible to greatly reduce the space of the engine room in which the vehicle is disposed, and it is possible to increase the space of the cargo hold disposed below the upper deck.

  In addition, by providing the second group of power generators in the engine room, the number of the first group of power generators arranged on the upper deck can be reduced, greatly increasing the space occupied by the group of power generators on the upper deck. The space for production equipment can be increased.

  Furthermore, since the electric power temporarily required for navigation from the construction site to the installation site of the floating production facility is generated by the second group of power generation devices that are part of the power generation device group used when the production facility is in operation, There is no need to provide a separate power generator for use only during navigation.

  Therefore, since a part of the large-scale power generation system equipped on the upper deck in the prior art is installed in the engine room, the space above the upper deck where the production equipment is installed can be used more widely. In addition, the investment cost of the initial mobile device can be suppressed, and the self-navigation cost can be reduced.

It is a sectional side view which shows typically the structure of the floating type offshore installation of embodiment of this invention. It is a plane of the stern part which shows typically the power generator group on the upper deck of the floating-type offshore installation of embodiment of this invention. It is a sectional side view of an engine room which shows typically composition in an engine room of a floating type offshore facility of an embodiment of the invention. It is a top view of the engine room which shows typically arrangement of the power generator of the 2nd group in the engine room of the floating type offshore equipment of an embodiment of the invention. It is a top view of the engine room which shows typically arrangement of an electric motor, a propeller rotating shaft, a propeller, etc. of an electric propulsion system in an engine room of a floating offshore facility of an embodiment of the invention. It is an electric system figure of the electric power supply system of the floating type offshore installation of embodiment of this invention. It is a sectional side view which shows typically the structure of the floating body type offshore installation in a prior art.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a floating offshore facility and a power supply method for a floating offshore facility according to embodiments of the present invention will be described with reference to the drawings. As the floating offshore facility of this embodiment, an FPSO (floating body production storage and loading facility) will be described as an example. However, the present invention is not limited to this FPSO, and the propulsion device is used when navigating offshore. If it is a floating offshore facility that does not require a propulsion device during operation on the ocean, it can be applied.

  For example, FSO (floating storage and loading equipment) or FSU (floating storage equipment) without oil / gas production facilities, FLNG (liquefied storage and loading equipment: LNG-FPSO) that handles LNG, FLPG that handles LPG ( The present invention can also be applied to LPG-FPSO), FSRU (floating body storage regasification facility), and the like.

  In general, the floating offshore facility 1 such as FPSO has almost the same shape as a vessel such as VLCC, so here, the names of the respective parts are the same as those of the vessel such as VLCC. ”,“ Stern ”,“ upper deck ”, etc.

  As shown in FIGS. 1 to 5, the floating offshore facility 1 of this embodiment has substantially the same shape as a ship such as a VLCC, and is automatically installed from a manufacturing site or port to an offshore installation site such as an oil field. It moves by voyage and is used in a state where it is held on the ocean at this offshore installation location by a mooring system or automatic position holding system.

  As shown in FIG. 1, this floating offshore facility 1 has a hull 2, an upper deck 3, and a stern part 4, and an engine room 5 is provided under the upper deck 3 in front of the stern part 4. A cargo hold 6 is provided in front of 5, and an upper structure 7 composed of a residential area and a portion serving as a bridge during navigation is provided on the engine room 5. A chimney 5 a is provided in the upper part of the engine room 5. In addition, when the floating offshore facility 1 is to be self-propelled even temporarily, a navigation facility is installed on the bridge of the superstructure 7 and used for initial movement.

  Further, as shown in FIG. 2, on the upper deck 3 in front of the superstructure 7, for example, a production facility 30 for processing crude oil or natural gas and a power generator group for supplying power to the production facility 30. A first group of power generators 11a, 11b, 12a, and 12b are arranged. Normally, the power generators 11a, 11b, 12a, and 12b of the first group are arranged on the upper structure 7 side, that is, the rear side with respect to the production facility 30, and are provided in two rows horizontally.

  As shown in FIGS. 3 to 5, the floating offshore facility 1 includes an electric propulsion system 20 on the stern portion 4 side of the hull 2, and the electric propulsion system 20 includes the stern of the engine room 5. The propeller (propulsion unit) 21 attached to the rear end of the propeller rotation shaft (propulsion shaft) 21a protruding toward the section 4 side, the motors (propulsion motors) 22a and 22b in the engine room 5, and the second group of power generators The power generators 13a and 13b are arranged in two horizontal rows.

  That is, the floating offshore facility 1 includes a production facility 30 to which power is supplied by a plurality (six in this embodiment) of power generation devices 11a, 11b, 12a, 12b, 13a, and 13b. A floating offshore facility 1 that is held and used, and a propulsion system for moving the floating offshore facility 1 includes an electric propulsion system 20 that drives a propeller 21 with electric motors 22a and 22b. At the same time, the first group of power generation devices 11a, 11b, 12a, and 12b are arranged on the upper deck 3, and the second group of power generation devices 13a and 13b are arranged in the engine room 5, respectively.

  Further, the electric power for operating the production facility 30 provided in the floating offshore facility 1 is supplied by the power generators 11a, 11b, 12a, 12b, 13a, 13b of both the first group and the second group, and the electric motor 22a, The power for driving 22b is supplied by the second group of power generation devices 13a and 13b.

  In this case, from the viewpoint of control of power supply, it is preferable that the power generation devices 11a, 11b, 12a, 12b, 13a, and 13b have the same model and capacity, and the power generation devices 11a, 11b, 12a, 12b, and 13a. , 13b, the first group of power generation devices 11a, 11b, 12a, 12b and the second group of power generation devices 13a, 13b are two units. From the aspect, it is preferable.

  Further, if at least a part or all of the power generators 11a, 11b, 12a, 12b, 13a, and 13b are configured by a diesel generator, the propeller rotary shaft 21a is provided in the engine room 5 even when the electric propulsion system 20 is employed. Space for electric motors 22a and 22b, power generators 13a and 13b, a propulsion control device (not shown), etc. must be secured, and the space for this electric propulsion system 20 is directly driven by the internal combustion engine to drive the propeller. Since the space becomes smaller than the case where the propulsion system is employed, the space where the diesel generator can be disposed can be easily secured, so that the fuel consumption can be improved as compared with the case where the gas turbine generator is employed.

  According to the above configuration, the propulsion system for moving the floating offshore facility 1 is configured by the electric propulsion system 20 that drives the propeller 21 with the electric motors 22a and 22b. Even if the devices 13a and 13b are provided in the engine room 5, the engine room 5 is more than the case where a propulsion system that directly drives the propeller 21 by the main engine 40 constituted by an internal combustion engine as in the prior art shown in FIG. The entire space can be reduced, and the space of the cargo hold 6 disposed under the upper deck 3 can be increased.

  Further, by providing the engine room 5 with the second group of power generation devices 13a and 13b of the power generation device group that supplies power to the production facility 30, the first group of power generation devices 11a on the upper deck 3, Since the number of bases 11b, 12a and 12b can be reduced from 6 to 4 in this embodiment, the space occupied by the power generator group on the upper deck 3 can be greatly reduced, The space for the facility 30 can be increased.

  In addition, since initial navigation devices such as electric propulsion devices, propulsion control devices, and navigation facilities that are temporarily required for navigation from the construction site to the installation location of the floating production facility 1 are provided, navigation costs are reduced. Is possible. In addition, since the power necessary for the navigation is generated by the power generation devices 13a and 13b of the second group of the power generation device group that is used when the production facility 30 is in operation, a power generation device that is used only during the navigation is provided. There is no need. In particular, when the floating production facility 1 includes a large-scale power generation system of 100 MW class, it is possible to sufficiently cover the power used by the electric propulsion system 20 during navigation.

  Further, as shown in FIG. 6, the rotation speed control of the propeller 21 of the electric propulsion system 20 is performed by the inverters 25a and 25b, and the inverters 25a and 25b are also used for the transfer speed control of the cargo pump (not shown). Then, since the expensive inverters 25a and 25b can be used for the initial movement of the floating production facility 1 and the transfer of the product, the inverters 25a and 25b can be used efficiently, and the equipment cost as a whole can be reduced. That is, in the prior art, the cargo pump is formed by steam drive, but when there are inverters 25a and 25b used for the initial movement, the inverters 25a and 25b can be used together or by rearranging the inverters 25a and 25b. By using it for both movement and operation of the production facility 30, the freight pump can be switched to electric drive with low cost. By adopting the electrification of this cargo pump, it is possible to contribute to a reduction in fuel costs as compared to the conventional steam turbine driven cargo pump.

  Therefore, since a part of the large-scale power generation system equipped on the upper deck 3 in the prior art is installed in the engine room 5, the space above the upper deck 3 on which the production equipment 30 is installed can be used more widely. . In addition, the investment cost of the initial mobile device can be suppressed, and the self-navigation cost can be reduced.

  And the electric power supply method of the floating type offshore installation of embodiment of this invention is the production equipment 30 with which electric power is supplied by several electric power generation apparatus 11a, 11b, 12a, 12b, 13a, 13b, as shown in FIG. Is a method for supplying power to the floating offshore facility 1 that is used while being held on the ocean. The power for operating the production facility 30 provided on the floating offshore facility 1 is disposed on the upper deck 3. Electricity propulsion for moving the floating offshore facility 1 while being supplied by the first group of power generators 11a, 11b, 12a, 12b and the second group of power generators 13a, 13b disposed in the engine room 5 In this method, electric power for driving the electric motors 22a and 22b of the system 20 is supplied by the second group of power generation devices 13a and 13b.

  More specifically, as shown in the upper part of FIG. 6, when the floating offshore facility 1 is in operation, power is generated by the first group of power generators 11 a, 11 b, 12 a, 12 b on the upper deck 3. The power is collected by the 13.8kV or 11kV switch board 23a on the upper deck 3 side, enters the transformer 26a, is converted from 13.8kV or 11kV to 6.6kV / 440V, and then becomes the 6.6kV / 440V switch board. 27a, and is supplied from the 6.6kV / 440V switch board 27a to the power consumption portion of the production facility 30.

  In addition, as shown in the lower part of FIG. 6, the electric power generated by the second group of power generation devices 13 a and 13 b in the engine room 5 is converted into a transformer 24 a and a self-propulsion by the floating offshore facility 1. 24b is converted into a working voltage of the electric motors 22a and 22b, supplied to the electric motors 22a and 22b via the inverters 25a and 25b, and the rotation of the electric motors 22a and 22b is converted into the rotation of the propeller rotary shaft 21a by the gear device 28. Thus, the propeller 21 is rotated, and the floating offshore facility 1 is able to travel by obtaining propulsion by the rotation of the propeller 21. The rotation speed control of the propeller 21 is performed by the inverters 25a and 25b.

  When the floating offshore facility 1 is in operation, the electric power generated by the second group of power generation devices 13a and 13b in the engine room 5 is collected by the 13.8 kV or 11 kV switch board 23b on the engine room 5 side. , Enters the transformer 26b, is converted from 13.8kV or 11kV to 6.6kV / 440V, and is supplied to the 6.6kV / 440V switch board 27b, from which the 6.6kV / 440V switch board 27b Supplied to the power consumption part.

  In the embodiment shown in FIG. 6, the propeller rotational speed control is performed by the inverters 25a and 25b in order to change the propulsion force of the propeller 21, but the propeller 21 is configured by a variable pitch propeller (CPP), and the electric motor When 22a and 22b are comprised with the induction type motor, the propulsive force of the propeller 21 can be changed by changing the pitch (attack angle) of the propeller 21. FIG. In this configuration, it is not necessary to use expensive inverters 25a and 25b. However, when an inverter is used by electrifying the cargo pump, this inverter may be used as the inverters 25a and 25b for controlling the rotation speed of the propeller 21. preferable.

  According to this method, the power supply to the production equipment on the upper deck is performed by the first group of generators on the upper deck and the second group of generators installed in the engine room. It is possible to reduce the number of power generators arranged on the top, and to use the upper deck on which production equipment is installed more widely. In addition, during the initial movement, power is supplied to the motor of the electric propulsion system by the second group of power generation devices, so that the investment cost for the initial movement device can be suppressed and the self-propulsion cost can be reduced.

  Therefore, according to the floating offshore facility 1 configured as described above and the power supply method for the floating offshore facility, the electric propulsion system 20 constitutes the propulsion system used in the voyage from the factory or the port to the offshore installation location. As a result, the space in the engine room in which the propulsion system is disposed can be greatly reduced, and the space in the cargo hold 6 disposed under the upper deck 3 can be increased. For example, the hatched portion shown in FIG. 1 can be used as a space for the cargo hold 6.

  Further, by providing the second group of power generation devices 13a, 13b in the engine room 5, the number of the first group of power generation devices 11a, 11b, 12a, 12b arranged on the upper deck 3 can be reduced. The space occupied by the power generation device group on the deck 3 can be greatly reduced, and the space for the production facility 30 can be increased.

  Furthermore, the second group of power generation devices 13 a and 13 b that are part of the power generation device group that uses temporarily the power necessary for navigation from the construction site to the installation location of the floating production facility 1 when the production facility 30 is in operation. Therefore, it is not necessary to provide a separate power generator for use only during navigation.

  Therefore, in order to equip the engine room 5 with a part of the large-scale power generation system equipped on the upper deck 3 in the prior art, the upper deck 3 on which the production equipment 30 is installed can be used more widely. In addition, the investment cost of the initial mobile device can be suppressed, and the self-navigation cost can be reduced.

  According to the floating offshore facility and the power supply method of the floating offshore facility according to the present invention, the floating offshore facility is used in a voyage from a factory or a port to an offshore installation location. Since the space in the engine room where the unnecessary propulsion system is installed can be greatly reduced, the production facilities as offshore facilities and the cargo hold space for storage can be remarkably increased. It can be used for offshore facilities.

DESCRIPTION OF SYMBOLS 1, 1X Floating type offshore equipment 2 Hull 3 Upper deck 4 Stern 5, 5X Engine room 5a Chimney 6 Cargo hold 7 Upper structure 11a, 11b, 12a, 12b First group power generators 13a, 13b Second group power generation Device 20 Electric propulsion system 21 Propeller (propulsion device)
21a Propeller rotating shaft (propulsion shaft)
22a, 22b Electric motor 23a, 23b 13.8kV or 11kV switch board 24a, 24b Transformer 25a, 25b Inverter 26a, 26b Transformer 27a, 27b 6.6kV / 440V switch board 30 Production equipment 40 Main engine 41 Power generation device

Claims (4)

In a floating offshore facility that is equipped with production facilities that are supplied with power by a plurality of power generators and that is used while being held on the ocean,
The propulsion system for moving the floating offshore facility is composed of an electric propulsion system that drives a propulsion device with an electric motor, and the first group of the power generation devices are arranged on the upper deck, and the second group of the power generation devices is an engine. Arranged and configured in the room,
And while supplying the electric power which operates the production facility provided in the said floating body type offshore installation by the said electric power generation apparatus of both the said 1st group and the 2nd group, the electric power which drives the said electric motor is the said electric power generation of the said 2nd group A floating offshore facility characterized by being supplied by a device.   The floating offshore facility according to claim 1, wherein at least a part or all of the power generation device is constituted by a diesel generator.   The floating offshore facility according to claim 1 or 2, wherein the rotation speed control of the propulsion unit of the electric propulsion system is performed by an inverter, and the inverter is also used for a transfer speed control of a cargo pump. . In a power supply method for a floating offshore facility that includes a production facility to which power is supplied by a plurality of power generation devices and is used while being held on the ocean,
Supplying electric power for operating the production facility provided in the floating offshore facility by the first group of power generation devices disposed on the upper deck and the second group of power generation devices disposed in the engine room,
A power supply method for a floating offshore facility, wherein power for driving an electric motor of an electric propulsion system for moving the floating offshore facility is supplied by the power generator of the second group.

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