KR20240030100A - Power generation system of floating structure - Google Patents

Abstract

The present invention relates to a power production system for a floating structure, comprising a power generation unit that produces power by connecting a plurality of generators to a plurality of power generation engines, and a power distribution unit that distributes the power produced by the power generation unit. A power production system for a floating structure, comprising: a transformer that transforms the power distributed from the power distribution unit; A power conversion unit consisting of a plurality of conversion units that convert the frequency of the power transformed from the transformer; and a propulsion motor unit consisting of a plurality of propulsion motors that receive power converted from the plurality of conversion units and drive a propeller, wherein each of the plurality of conversion units converts the frequency of the power transformed from the transformer unit. power conversion device; A power changeover device that changes a target receiving power converted from the power conversion device according to the current situation (sailing operation situation or anchoring situation) of the floating structure; And it may include a controller that controls the operation of the power conversion device and the power changeover device.

Description

Power production system of floating structures {POWER GENERATION SYSTEM OF FLOATING STRUCTURE}

The present invention relates to a power generation system for floating structures.

Recently, natural gas consumption has been rapidly increasing worldwide. Natural gas is transported in a gaseous form through gas pipelines on land or at sea, or is stored in an LNG carrier (particularly an LNG carrier) in the form of liquefied natural gas and transported to distant demand sources. Liquefied natural gas is obtained by cooling natural gas to extremely low temperatures (approximately -163°C), and its volume is reduced to approximately 1/600 compared to gaseous natural gas, making it very suitable for long-distance transportation by sea.

LNG carriers are intended to carry liquefied natural gas on the sea and unload liquefied natural gas to onshore customers. For this purpose, LNG storage tanks (commonly referred to as 'cargo holds') that can withstand the extremely low temperatures of liquefied natural gas are installed. Includes. Typically, these LNG carriers unload the liquefied natural gas in the LNG storage tank on land in its liquefied state, and the unloaded LNG is regasified by an LNG regasification facility installed on land and then transported through gas pipes to natural gas consumers. do.

These onshore LNG regasification facilities are known to be economically advantageous when installed in places where there is a stable demand for natural gas because the natural gas market is well established.

However, in the case of natural gas consumers with seasonal, short-term, or periodic natural gas demand, it is economically very disadvantageous to install LNG regasification facilities on land due to high installation and management costs.

In particular, if the LNG regasification facility on land is destroyed by a natural disaster, etc., even if the LNG carrier reaches the demand destination with LNG, the LNG cannot be regasified, so natural gas transportation using existing LNG carriers has limitations. there is.

Accordingly, for example, an offshore LNG regasification system is installed in an offshore plant or LNG carrier, regasifies liquefied natural gas at sea, and supplies the natural gas obtained through the regasification to land. was developed.

Examples of floating structures equipped with a storage tank capable of storing liquefied gas in a cryogenic state and a regasification facility to regasify the liquefied gas include ships such as an LNG RV (Regasification Vessel) and an LNG FSRU (Floating Storage and Regasification Unit). Plants such as and the like can be mentioned.

In particular, the LNG FSRU is a floating structure that stores liquefied natural gas unloaded from an LNG carrier in a storage tank at sea far from land, then vaporizes the liquefied natural gas as needed and supplies it to onshore customers.

These LNG FSRU floating structures require large amounts of power to operate regasification facilities, and for this reason, large-capacity power generation facilities and electric propulsion systems are being applied. For example, the electric propulsion system of the LNG FSRU floating structure largely consists of four transformers, two large-capacity power conversion devices, and two propulsion motors to drive the propeller.

However, the LNG FSRU floating structure has a problem in that the utilization of electric propulsion equipment is very low because the time spent at anchor is much greater than the time spent sailing.

The present invention was created to solve the problems of the prior art as described above, and the purpose of the present invention is to provide a power production system for a floating structure that can increase the utilization of electric propulsion equipment.

The power production system of a floating structure according to one aspect of the present invention includes a power generation unit that produces power by connecting a plurality of generators to a plurality of power generation engines, and a power distribution unit that distributes the power produced by the power generation unit. A power production system of a floating structure comprising: a transformer that transforms the power distributed from the power distribution unit; A power conversion unit consisting of a plurality of conversion units that convert the frequency of the power transformed from the transformer; and a propulsion motor unit consisting of a plurality of propulsion motors that receive power converted from the plurality of conversion units and drive a propeller, wherein each of the plurality of conversion units converts the frequency of the power transformed from the transformer unit. power conversion device; A power changeover device that changes a target receiving power converted from the power conversion device according to the current situation (sailing operation situation or anchoring situation) of the floating structure; And it may include a controller that controls the operation of the power conversion device and the power changeover device.

Specifically, each of the corresponding controllers provided in each of the neighboring conversion units among the plurality of conversion units is mutually interfaced, and each of the corresponding power conversion devices provided in each of the neighboring conversion units is provided in each of the neighboring conversion units. Each of the corresponding power changeover devices can be controlled commonly or individually.

Specifically, each of the corresponding controllers provided in each of the neighboring conversion units commonly controls each of the corresponding power conversion devices provided in each of the neighboring conversion units during navigation operation of the floating structure to operate the plurality of propulsion motors. Synchronized power can be supplied to any one of the propulsion motors.

Specifically, each of the corresponding controllers provided in each of the neighboring conversion units individually controls each of the corresponding power conversion devices provided in each of the neighboring conversion units when the floating structure is anchored to a demand point requiring speed control. Power can be supplied.

A floating structure according to another aspect of the present invention is characterized by comprising the power production system described above.

The power production system of the floating structure according to the present invention is divided into at least two small-capacity power conversion devices so that the capacity is the same as that of one existing large-capacity power conversion device, and provides power changeover to each of the at least two small-capacity power conversion devices. By providing a device and a controller, at least two power conversion devices are interfaced with each other by the controller and a power changeover device, and during sailing operation, one master commonly controls at least two power conversion devices to drive one propulsion device. It supplies synchronized power to the motor, and when at anchor, it can control at least two power conversion devices individually to supply power to demanders that require speed control, so it can be used as a VFD panel (Variable Frequency Drive panel) for demanders. , the utilization of electric propulsion equipment can be increased, and when a floating structure is equipped with regasification equipment, at least two power conversion devices that can be operated individually can be used to control the speed of the LNG booster pump, providing more precise Flow control is possible, the separately installed LNG booster pump starter panel can be removed, excessive voltage drop that occurs when starting a large-capacity pump motor can be prevented, and long-term non-operation can be avoided. Maintenance problems that arise can be reduced.

1 is a configuration diagram of a power production system for a floating structure according to an embodiment of the present invention.

The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In this specification, when adding reference numbers to components in each drawing, it should be noted that identical components are given the same number as much as possible even if they are shown in different drawings. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

1 is a configuration diagram of a power production system for a floating structure according to an embodiment of the present invention.

Referring to Figure 1, the power production system 1 of the floating structure according to an embodiment of the present invention includes a power generation unit 2, a power distribution unit 3, a transformer unit 4, a power conversion unit 5, It may include a propulsion motor unit (6), a reduction gear (7), and a propeller (8).

In this embodiment, the floating structure is a concept that includes both structures and ships that are used while floating at sea and have storage tanks and regasification facilities for storing liquid cargo loaded in a cryogenic state, such as LNG, e.g. For example, it includes both offshore structures such as LNG FSRU (Floating Storage and Regasification Unit) and LNG FPSO (Floating, Production, Storage and Offloading) as well as ships such as LNG RV (LNG Regasification Vessel).

The power generation unit 2 may be connected to a plurality of power generation engines (not shown) to produce power and supply it to the power distribution unit 3, and may be comprised of a plurality of generators 21, 22, and 23.

The plurality of generators 21, 22, and 23 may include a first generator 21, a second generator 22, and a third generator 23.

The first generator 21 supplies the produced power to the first switchboard 31 of the power distribution unit 3, and the second generator 22 supplies the produced power to the first switchboard 31 of the power distribution unit 3 ( 31) or the second switchboard 32, and the third generator 23 can supply the produced power to the second switchboard 32 of the power distribution unit 3.

In this embodiment, it is explained that the power generation unit 2 is composed of three generators 21, 22, and 23, but the present invention is not limited to this.

The power distribution unit (3) can receive the power produced in the power generation unit (2) and distribute it to the transformer unit (4) or within the ship, and includes a plurality of distribution boards (31, 32) and switches for power supply and cutoff. It can be configured.

The plurality of switchboards 31 and 32 may be composed of a first switchboard 31 and a second switchboard 32.

The first switchboard 31 receives power produced from the first generator 21 and/or the second generator 22 and distributes it to the first transformer 41 or the second transformer 42 of the transformer unit 4. can do.

The second switchboard (32) receives the power produced from the second generator (22) and/or the third generator (23) and distributes it to the third transformer (43) or fourth transformer (44) of the transformer unit (4). can do.

The transformer 4 can transform the power distributed from the power distribution unit 3 and supply it to the power conversion unit 5, and may be composed of a plurality of transformers 41, 42, 43, and 44.

The plurality of transformers 41, 42, 43, and 44 may include a first transformer 41, a second transformer 42, a third transformer 43, and a fourth transformer 44.

The first transformer 41 can transform the power distributed from the first switchboard 31 and supply it to the first conversion unit 51 of the power conversion unit 5.

The second transformer 42 can transform the power distributed from the first switchboard 31 and supply it to the second conversion unit 52 of the power conversion unit 5.

The third transformer 43 can transform the power distributed from the second switchboard 32 and supply it to the third conversion unit 53 of the power conversion unit 5.

The fourth transformer 44 can transform the power distributed from the second switchboard 32 and supply it to the fourth conversion unit 54 of the power conversion unit 5.

The power conversion unit 5 can convert the frequency of the power transformed from the transformer 4 and supply it to the propulsion motor unit 6, and may be composed of a plurality of conversion units 51, 52, 53, and 54. .

The plurality of conversion units 51, 52, 53, and 54 may include a first conversion unit 51, a second conversion unit 52, a third conversion unit 53, and a fourth conversion unit 54.

The first conversion unit 51 includes a first power conversion device 511 that converts the frequency of the power transformed from the first transformer 41, and the current situation of the floating structure (for example, sailing operation situation or anchorage). a first power change-over device 512, a first power conversion device 511, and a first power change-over device that changes the target receiving the power converted from the first power conversion device 511 depending on the situation, etc.) It may include a first controller 513 that controls the operation of 512. Here, the power supply target may be the first propulsion motor 61 of the propulsion motor unit 6 or various demand sources 9 that require speed control.

The second conversion unit 52 includes a second power conversion device 521 that converts the frequency of the power transformed from the second transformer 42, and the current situation of the floating structure (for example, sailing operation situation or anchorage). A second power change-over device 522, a second power conversion device 521, and a second power change-over device that changes the target receiving the power converted from the second power conversion device 521 depending on the situation (situation, etc.) It may include a second controller 523 that controls the operation of 522. Here, the power supply target may be the first propulsion motor 61 of the propulsion motor unit 6, such as the first conversion unit 51, or various demand sources 9 that require speed control.

The third conversion unit 53 includes a third power conversion device 531 that converts the frequency of the power transformed from the third transformer 43, and the current situation of the floating structure (for example, sailing operation situation or anchorage). a third power change-over device 532, a third power conversion device 531, and a third power change-over device that changes the object receiving the power converted from the third power conversion device 531 depending on the situation, etc.) It may include a third controller 533 that controls the operation of 532. Here, the power supply target may be the second propulsion motor 62 of the propulsion motor unit 6 or various demand sources 9 that require speed control.

The fourth conversion unit 54 includes a fourth power conversion device 541 that converts the frequency of the power transformed from the fourth transformer 44, and the current situation of the floating structure (for example, sailing operation situation or anchorage). a fourth power change-over device 542, a fourth power conversion device 541, and a fourth power change-over device that changes the target receiving the power converted from the fourth power conversion device 541 depending on the situation, etc.) It may include a fourth controller 543 that controls the operation of 542. Here, the power supply target may be the second propulsion motor 62 of the propulsion motor unit 6, such as the third conversion unit 53, or various demand sources 9 that require speed control.

In the above, the first controller 513 of the first conversion unit 51 and the second controller 523 of the second conversion unit 52 are interfaced with each other, and the first power conversion device of the first conversion unit 51 (511), the first power change-over device 512, and the second power conversion device 521 and the second power change-over device 522 of the second conversion unit 52 can be controlled commonly or individually.

Specifically, the first controller 513 of the first conversion unit 51 and the second controller 523 of the second conversion unit 52 act as a master during the navigation operation of the floating structure. The power conversion device 511 and the second power conversion device 521 can be controlled so that synchronized power is supplied to the first propulsion motor 61 of the propulsion motor unit 6. At this time, the first and second power changeover devices (512, 522) each use the power converted from the first and second power conversion devices (511, 521) by the first and second controllers (513, 523), respectively, to the propulsion motor unit. It is changed to be supplied to the first propulsion motor (61) of (6).

In addition, the first controller 513 of the first conversion unit 51 and the second controller 523 of the second conversion unit 52 operate the first power conversion device 511 and the second power conversion device 511 when the floating structure is anchored. The power conversion device 521 can be individually controlled to ensure that power is supplied to the demand source 9 that requires speed control. At this time, the first and second power changeover devices (512, 522) use the power converted from the first and second power conversion devices (511, 521) by the first and second controllers (513, 523) to a demand source requiring speed control. It is changed to be supplied to (9). For this reason, when a floating structure is anchored, the first conversion unit 51 and the second conversion unit 52 can be used as a VFD panel (Variable Frequency Drive panel) of the demand source 9. In this embodiment, when the floating structure is anchored, the first power conversion device 511 and the second power conversion device 521 are individually controlled and power is supplied, so the demand source 9 receiving power may be the same or different. there is.

In the above, the third controller 533 of the third conversion unit 53 and the fourth controller 543 of the fourth conversion unit 54 are interfaced with each other, and the third power conversion device of the third conversion unit 53 (531), the third power change-over device 532, and the fourth power conversion device 541 and the fourth power change-over device 542 of the fourth conversion unit 54 can be controlled commonly or individually.

Specifically, the third controller 533 of the third conversion unit 53 and the fourth controller 543 of the fourth conversion unit 54 act as one master and the third controller during navigation of the floating structure. The power conversion device 531 and the fourth power conversion device 541 can be controlled so that synchronized power is supplied to the second propulsion motor 62 of the propulsion motor unit 6. At this time, the power converted from the 3rd and 4th power conversion devices 531 and 541 by the 3rd and 4th controllers 533 and 543, respectively, of the 3rd and 4th power changeover devices 532 and 542 is transferred to the propulsion motor unit. It is changed to be supplied to the second propulsion motor (62) of (6).

In addition, the third controller 533 of the third conversion unit 53 and the fourth controller 543 of the fourth conversion unit 54 operate the third power conversion device 531 and the fourth power conversion device 531 when the floating structure is anchored. The power conversion device 541 can be individually controlled to ensure that power is supplied to the demand source 9 that requires speed control. At this time, the 3rd and 4th power changeover devices (532, 542) use the power converted from the 3rd and 4th power conversion devices (531, 541) by the 3rd and 4th controllers (533, 543) to demand places that require speed control. It is changed to be supplied to (9). For this reason, when a floating structure is anchored, the third conversion unit 53 and the fourth conversion unit 54 can be used as a VFD panel (Variable Frequency Drive panel) of the demand source 9. In this embodiment, when the floating structure is anchored, the third power conversion device 531 and the fourth power conversion device 541 are individually controlled and power is supplied, so the demand source 9 receiving power may be the same or different. there is.

Previously, power was supplied to the first propulsion motor 61 of the propulsion motor unit 6 using one large capacity power conversion device, and one large capacity power conversion device was used to supply power to the second propulsion motor 62 of the propulsion motor unit 6. Power was supplied using a power conversion device.

In this embodiment, it is divided into a small-capacity first power conversion device 511 and a second power conversion device 521 so that the capacity is the same as that of the existing large-capacity one power conversion device, and also another power conversion device is used for the existing large-capacity one power conversion device. It is divided into a small-capacity third power conversion device (531) and a fourth power conversion device (541) so that the capacity is the same compared to the device, but unlike the existing one, the first, second, third, and fourth power conversion devices (511, 521, 531) , 541) by providing the first, second, third, and fourth power changeover devices (512, 522, 532, 542) and the first, second, third, and fourth controllers (513, 523, 533, and 543), respectively. By the 1st and 2nd controllers (513, 523) and the 1st and 2nd power changeover devices (512, 522) or the 3rd and 4th controllers (533, 543) and the 3rd and 4th power changeover devices (532, 542) The first and second power conversion devices (511, 521) or the third and fourth power conversion devices (531, 541) are interfaced with each other, and during navigation operation, the first and second power conversion devices (511) act as one master. , 521) or the third and fourth power conversion devices (531, 541) are commonly controlled to supply synchronized power to the first propulsion motor (61) or the second propulsion motor (62), and when anchored, the first and fourth power conversion devices (531, 541) are commonly controlled. By individually controlling the 2nd power converter (511, 521) or the 3rd and 4th power converter (531, 541), power can be supplied to the demander (9) that requires speed control, and the VFD panel ( Variable Frequency Drive panel), can increase the utilization of electric propulsion equipment, and can be operated individually when the floating structure is equipped with regasification equipment. 4When using the power converter (531, 541) to control the speed of the LNG booster pump, more precise flow control is possible, and the separately installed LNG booster pump starter panel can be deleted. This can prevent excessive voltage drops that occur when starting a large-capacity pump motor, and reduce maintenance problems that occur due to long-term non-operation.

The propulsion motor unit 6 can drive the propeller 8 by receiving power converted from the power conversion unit 5, and may be composed of a plurality of propulsion motors 61 and 62.

The plurality of propulsion motors 61 and 62 may include a first propulsion motor 61 and a second propulsion motor 62.

The first propulsion motor 61 can drive the propeller 8 by receiving the converted power from the first and second conversion units 51 and 52.

The second propulsion motor 62 can drive the propeller 8 by receiving the converted power from the third and fourth conversion units 53 and 54.

A reduction gear 7 may be provided between the first and second propulsion motors 61 and 62 and the propeller 8.

The reduction gear 7 can change the rotation speed of the first and second propulsion motors 61 and 62 to lower the rotation speed of the propeller 8.

In the above, the present invention has been described focusing on the embodiments of the present invention, but this is only an example and does not limit the present invention, and those of ordinary skill in the field to which the present invention pertains will not deviate from the essential technical content of the present embodiments. It will be appreciated that various combinations, modifications, and applications not illustrated in the examples are possible within the scope. Accordingly, technical details related to modifications and applications that can be easily derived from the embodiments of the present invention should be construed as included in the present invention.

1: Power production system 2: Power generation department
21: first generator 22: second generator
23: Third generator 3: Power distribution unit
31: first switchboard 32: second switchboard
4: Transformer 41: First transformer
42: second transformer 43: third transformer
44: Fourth transformer 5: Power conversion unit
51: first conversion unit 511: first power conversion device
512: First power changeover device 513: First controller
52: second conversion unit 521: second power conversion device
522: Second power changeover device 523: Second controller
53: Third conversion unit 531: Third power conversion device
532: Third power changeover device 533: Third controller
54: Fourth conversion unit 541: Fourth power conversion device
542: Fourth power changeover device 543: Fourth controller
6: Propulsion motor unit 61: First propulsion motor
62: Second propulsion motor 7: Reduction gear
8; Propeller 9: Demand

Claims (5)

A power production system of a floating structure comprising a power generation unit that produces power by connecting a plurality of generators to a plurality of power generation engines, and a power distribution unit that distributes the power produced by the power generation unit,
a transformer that transforms the power distributed from the power distribution unit;
A power conversion unit consisting of a plurality of conversion units that convert the frequency of the power transformed from the transformer; and
It includes a propulsion motor unit consisting of a plurality of propulsion motors that receive power converted from the plurality of conversion units and drive a propeller,
Each of the plurality of conversion units,
A power conversion device that converts the frequency of the power transformed from the transformer;
A power changeover device that changes a target receiving power converted from the power conversion device according to the current situation (sailing operation situation or anchoring situation) of the floating structure; and
A power production system comprising a controller that controls the operation of the power conversion device and the power changeover device. The method of claim 1, wherein each corresponding controller provided in each neighboring conversion unit among the plurality of conversion units is:
A power production system that is interfaced with each other and commonly or individually controls each of the corresponding power conversion devices provided in each of the neighboring conversion units and each of the corresponding power changeover devices provided in each of the neighboring conversion units. The method of claim 2, wherein each of the corresponding controllers provided in each of the neighboring conversion units,
A power production system that provides synchronized power to be supplied to any one of the plurality of propulsion motors by commonly controlling each of the corresponding power conversion devices provided in each of the neighboring conversion units during navigation operation of the floating structure. . The method of claim 2, wherein each of the corresponding controllers provided in each of the neighboring conversion units,
A power production system that individually controls each of the corresponding power conversion devices provided in each of the neighboring conversion units when the floating structure is anchored, so that power is supplied to demand sources requiring speed control. A floating structure equipped with the power production system according to any one of claims 1 to 4.

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