KR20140008004A - Power management system of ship and power management method of the same - Google Patents

Abstract

The present invention relates to a power management system of a floating type structure and a power management method thereof capable of stably distributing electric energy of a generator and driving a thruster for rapid docking by the structure of supplying the electric energy of the generator for a load of a premises customer within the floating type structure via a main bus for navigation and supplying the electric energy of the generator to the thruster via a sub-bus for docking. According to an embodiment of the present invention, provided is the power management system of the floating type structure comprising: the main bus for navigation connected to a plurality of main generators and a shaft generator, respectively and connected to a load of the customer in the floating structure for supplying the electric energy from at least one among the main generators and the shaft generator to the load of the customer within the floating structure; and a sub-bus for docking connected to the main generators and the shaft generator respectively and connected to a first thruster and a second thruster for supplying the electric energy from at least one among the main generators and the shaft generator to the first thruster and the second thruster. [Reference numerals] (40) Power management control board

Description

Power Management System of Floating Structures and Power Management Method thereof {POWER MANAGEMENT SYSTEM OF SHIP AND POWER MANAGEMENT METHOD OF THE SAME}

The present invention relates to a power management system of a floating structure and a power management method thereof, and more particularly, to supply electric energy of a generator to a consumer load in a floating structure through a nautical main bus and through an eyepiece sub-bus. The structure of supplying electrical energy of the generator to the thruster, which can stably distribute the electrical energy of the generator while enabling the thruster for fast berthing power management system of the floating structure and its power management method It is about.

A stationary structure, or a commonly operated floating structure, will in many cases have a diesel electric power supply of propellers and thrusters. Electrical energy is produced on board the vessel by generators driven by diesel engines and / or gas turbines, and by power plants with offshore automation systems, including power management systems (PMS).

Recently, the application of shaft generators is increasing in order to save energy in ships. In addition, thrusters are being used to berth harbors due to stability.

However, the frequent berthing often drives large capacity thrusters, resulting in voltage drops that can adversely affect the power distribution scheme.

In other words, the conventional power management system is composed of a single bus (single bus) is connected to a plurality of main generators, shaft generators and a plurality of thrusters in a single bus, the plurality of main generators to the load on the consumer side in the floating structure It supplies electrical energy through a single bus. At this time, when the floating structure is docked to the port, the thruster is supplied to the customer load, and the remaining capacity is supplied to the thruster at an additional capacity by stopping supply of electric energy to some of the customer loads, thereby ensuring stability. You can't give it.

In addition, when a rapid fluctuation of power consumption occurs in the thruster, power overload of a plurality of main generators, or large power fluctuations may occur. In addition, the power supply to the thruster in the event of a single bus failure is impossible due to berthing to the port.

And when it is possible to drive the thruster with the calculated capacity supplied to the customer load of the floating structure and the remaining capacity of the main generator when berthing to the port, the thruster is determined by one of the main generators Supplying electrical energy by capacity does not allow the thruster to start up and run quickly.

An object of the present invention is to provide electrical power of a generator by supplying electrical energy of a generator to a consumer load in a floating structure through a sailing main bus and supplying electrical energy of the generator to a thruster through an eyepiece sub-bus. The present invention provides a power management system and a power management method for a floating structure that can stably distribute energy and enable driving of a thruster for fast berthing.

According to an embodiment of the present invention for achieving the above object, a plurality of main generators, shaft generators connected to the shaft of the engine disposed in the floating structure to produce electrical energy by the rotation of the shaft, and the floating structure A power management system of a floating structure including first and second thrusters for generating thrust to be docked to the port, each of which is connected to the plurality of main generators and the shaft generators, respectively, and the plurality of main generators and the shafts. A voyage main bus connected with a load on the consumer side in the floating structure to supply electrical energy from at least one of the generators to a load on the consumer side in the floating structure; And the first and the second thrusters respectively connected to the plurality of main generators and the shaft generators to supply electrical energy from at least one of the plurality of main generators and the shaft generators to the first and second thrusters. A power management system for a floating structure is provided that includes an eyepiece sub-bus connected with two thrusters.

A power management control panel for monitoring electric energy amounts of the plurality of main generators and the shaft generators, and distributing a predetermined capacity from the plurality of main generators to the load on the customer side; A pair of switches respectively provided between the plurality of main generators, the navigation main bus and the eyepiece sub-bus, and installed between the shaft generator, the navigation main bus and the second thruster; And a thruster dedicated switch provided between the eyepiece sub-bus and the first and second thrusters, respectively.

The power management control panel includes a receiving unit for receiving an eyepiece request signal to the port; A calculator configured to calculate an amount of electric energy that can be driven by the plurality of main generators and shaft generators to drive the first and second thrusters according to the eyepiece request signal received by the receiver; A determination unit determining whether the first and second thrusters can be driven by the calculated amount of electric energy; And at least one generator preset among the plurality of main generators and shaft generators in the first and second thrusters via the eyepiece sub-bus when the determination unit determines that the first and second thrusters can be driven. It is preferable to control so as to supply the amount of electric energy for each of the generators from each other, and if the determination of the determination unit is impossible to drive the first and second thrusters, the electric energy is directly supplied from the shaft generator.

The power management control panel closes the switch between the shaft generator and the second thruster to supply electrical energy directly to the second thruster when the shaft generator detects an abnormality of the eyepiece sub-bus, and the eyepiece It is preferable to open the thruster-dedicated switch between the sub-bus and the second thruster.

Preferably, the first thruster is a stern thruster located at the stern, and the second thruster is a bow thruster located at the bow.

In addition, according to another embodiment of the present invention, a power management system of a floating structure, connected to a plurality of main generator and the shaft generator for sailing the main bus for supplying electrical energy to the load on the consumer side in the floating structure; An eyepiece sub-bus installed to be spaced apart from the main bus and connected to the plurality of main generators and the shaft generators to supply electrical energy to first and second thrusters installed at ends of the floating structure; And calculating the amount of driveable electric energy remaining after supplying the first and second thrusters from the plurality of main generators to the load when docking to the port of the floating structure. Power of a floating structure including a power management control panel for directly connecting the shaft generator and the second thruster to supply electrical energy of the shaft generator to the second thruster when the capacity of the second thruster is smaller than the required capacity of the second thruster. A management system is provided.

According to yet another embodiment of the present invention, a number of main generators, a shaft generator connected to the shaft of an engine disposed in the floating structure to produce electrical energy by rotation of the shaft, and the floating structure is docked in the port. A power management method of a power management system including first and second thrusters generating thrust as possible, the method comprising: calculating an amount of electric energy that can be driven from the plurality of main generators when the floating structure is docked to a port; ; Determining whether the first and second thrusters can be driven based on the calculated amount of electrical energy; And as a result of the determining in the determining step, supplying the calculated amount of electrical energy to the first and second thrusters when the first and second thrusters are driven using the calculated amount of electrical energy. And directly connecting the second thruster and the shaft generator to supply the electrical energy from the shaft generator to the second thruster when the first and second thrusters cannot be driven by the amount of electric energy. A power management method of a power management system is provided.

The supplying may include switching the first and second thrusters between the plurality of main generators and the eyepiece sub-bus if the first and second thrusters are driven by the calculated amount of electric energy. And closing the switch installed between the eyepiece sub-bus and the first and second thrusters, and driving the one thruster with the calculated amount of electric energy, and the plurality of main generators and the eyepiece sub-bus. It is preferable to close a switch provided between the eyepiece sub-bus and the first thruster, and a switch provided between the eyepiece sub-bus and the second thruster.

According to an embodiment of the present invention by the structure of supplying the electrical energy of the generator to the customer load in the floating structure through the main bus for navigation and the electrical energy of the generator to the thruster through the eyepiece sub-bus, The stable distribution of electrical energy has the effect of enabling the operation of the thruster for fast berthing.

In addition, according to an embodiment of the present invention, as the electric energy can be supplied from the shaft generator directly connected to the eyepiece sub-bus when docking to the port, the remaining capacity of the main generator is insufficient or the navigational main bus and eyepiece sub-bus In the event of a fault, it is possible to berth the port directly from the shaft generator. In particular, as the electrical energy is directly applied from the shaft generator, the capacity to be applied to the thruster is calculated from the main generator, and the calculated capacity is used to determine whether the thruster can be driven. The eyepiece can be enabled quickly.

And according to the embodiment of the present invention by the structure directly connected to the bow thruster located in the bow, the shaft generator has the effect of facilitating the bowing of the bow to the port.

1 is a view for explaining a power management system of a floating structure according to an embodiment of the present invention,
2 is a view for explaining a power management control panel of the power management system of the floating structure shown in FIG.
3 is an operation flowchart for explaining a power management method of a power management system of a floating structure according to an embodiment of the present invention.

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

1 is a view illustrating a power management system of a floating structure according to an embodiment of the present invention.

Referring to FIG. 1, a power management system of a floating structure according to an embodiment of the present invention includes a plurality of main generators 11, 12, and 13, an axis generator 14, and electrical energy to a consumer load in a floating structure when sailing. Voyage main bus 21 for supplying the ship, berthing sub-bus 22 for supplying electrical energy to the thruster when berthing to the port, floating from a plurality of main generators 11, 12, 13 during navigation Power management control panel for supplying predetermined electrical energy to the customer-side load in the formula structure, and controls the switches (S1 ~ S11) to supply electrical energy to the thrusters (31, 32) located at the fore and aft when docking to the port And 40.

The shaft generator 14 may be connected to the shaft of an engine (not shown) disposed in the floating structure to produce electrical energy by rotation of the shaft.

The plurality of main generators 11, 12, and 13 may be first to third diesel generators. The first to third diesel generators 11, 12, 13 are connected to the main bus 21 when sailing to supply electrical energy to the consumer load in the floating structure. At this time, between the main bus 21 and the first to third diesel generators 11, 12 and 13, the first to fourth switches S1-S4, the seventh and eighth switches S7 and S8 are provided. .

In more detail, the first diesel generator 11 is connected to the first and second switches S1 and S2 which are a pair of switches. The first switch S1 is connected to the main bus 21, and the second switch S2 is connected to the sub bus 22. In order to supply predetermined electric energy to the customer load in the floating structure during the voyage, the power management control panel 40 switches the first switch S1 according to the ON signal of the first switch S1 applied from the outside. By connecting the first diesel generator 11 and the main bus 21 through the control, the electric energy supplied from the first diesel generator 11 is controlled to be supplied to the consumer load in the floating structure connected to the main bus 21. . Although the 1st diesel generator 11 is demonstrated as an example here, the 2nd and 3rd diesel generators 12 and 13 are the same.

The second diesel generator 12 is connected to the main bus 31 through the third switch S3 and to the subbus 32 through the fourth switch S4. The third diesel generator 13 is connected to the main bus 31 through the seventh switch S7 and to the subbus 32 through the eighth switch S8. Accordingly, the power management control panel 40 is driven in the order of the second diesel generator 12, the third diesel generator 13 when the demand required by the customer load in the floating structure is insufficient only the first diesel generator 11. It is possible to smoothly supply electrical energy to the consumer-side load in the floating structure.

That is, the power management control panel 40 has a predetermined amount of electrical energy to be supplied to the consumer-side load in the floating structure, the electrical energy of the specified amount through the first to third diesel generators (11, 12, 13) If the amount of electrical energy to supply to the customer load in the reserve electric energy of the first to third diesel generators (11, 12, 13) is insufficient to supply the electrical energy in the floating structure through the shaft generator (14). The fifth switch S5 between the shaft generator 14 and the main bus 21 may be interrupted.

If the power management control panel 40 is capable of supplying electric energy to the consumer load in the floating structure only by the amount of electric energy retained by the first and second diesel generators 11 and 12, the power management control panel 40 is installed in the main bus 21. The ninth switch S9 may be adjusted to open the ninth switch S9.

In addition, the power management control panel 40 is the sub-bus 22 and the first thruster 31 to supply electrical energy to the first and second thrusters (S31, 32) provided at the stern and the end of the bow when berthing to the port. And the tenth and eleventh switches S10 and S11 to connect the tenth switch S10 installed between the second bus switch 11 and the eleventh switch S10 installed between the sub-bus 22 and the second thruster 32. ). In this case, the power management control panel 40 includes a second switch, a fourth switch, and an eighth switch S2 and S4 such that some or all of the first to third diesel generators 11, 12, and 13 are connected to the sub-bus 22. , S8) can be adjusted.

If the first diesel generator 11 can start and drive the first and second thrusters 31 and 32 with the remaining amount of electric energy supplied to the consumer side load, the power management control panel 40 switches the second switch. (S2) is connected to the first diesel generator 11 and the sub-bus 21 to connect the first and second thrusters (31, 32) of the first diesel generator 11 through the sub-bus (11). Supply electrical energy. However, the power management control panel 40 calculates the amount of electric energy being supplied to each consumer load from the first to third diesel generators 11, 12 and 13, and calculates the calculated amount of electric energy and the total electric energy in the diesel generator. Calculate the remaining capacity, that is, the amount of electric energy that can be driven by using the amount, and determine whether the calculated amount of electric energy is the driving capacity of the thruster. The first and second thrusters 31 and 32 can be started and driven.

However, when the calculated amount of electric energy is a capacity capable of driving only the first thruster, the power management control panel 40 sets the first thruster 31 among the first to third diesel generators 11, 12, and 13. Electric energy is supplied from the first thruster 31 to drive the second thruster 32 between the shaft generator 14 and the second thruster 32 so as to be directly connected to the shaft generator 14. The sixth switch S6 provided is interrupted. At this time, the power management control panel 40 applies a switch off signal to the eleventh switch S11 so as to open the eleventh switch S11 provided between the sub-bus 22 and the second thruster 32. .

The first thruster 31 is a stern thruster located at the stern, and the second thruster 32 is a bow thruster located at the bow. The first and second thrusters 31 and 32 may be plural in number.

In particular, in the event of an abnormality of the sub-bus 22, the power management control panel 40 closes the sixth switch S6 provided between the shaft generator 14 and the second thruster 32, and the sub-bus 32 and the second. As the eleventh switch S11 provided between the thrusters 32 is opened, the shaft generator 14 has a structure connected to the second thruster 32 via the sixth switch S6. In this way, the structure connected to the second thruster 32 directly from the shaft generator 14 enables berthing to the port and floats from the first to third diesel generators 11, 12, 13. Without the process of calculating the amount of electrical energy being supplied to the consumer side, the electrical power can be supplied directly from the shaft generator 14 at the time of the docking request to the port can enable fast berthing.

In addition, when fast docking to the port is required, the power management control panel 40 closes the sixth switch S6 between the shaft generator 14 and the second thruster 32 and the sub-bus 32 and the second thruster. The sixth switch S6 and the eleventh switch 11 may be adjusted to open the eleventh switch S11 between the 32.

A first transformer T1 is provided between the tenth switch S10 and the first thruster 31, and the first transformer T1 may transform, for example, AC 450V into 6600V. In addition, a second transformer T2 is provided between the eleventh switch S10 and the second thruster 32, and the second transformer T2 may also transform, for example, AC 450V into 6600. In particular, the electric energy passing through the sixth switch S6 from the shaft generator S14 is transformed into a high voltage determined by the second transformer T2 and supplied to the second thruster 32.

Referring to FIG. 2, the power management control panel 40 may include a memory 41, a supply 42, a receiver 43, a calculator 44, a determiner 45, and a controller 46. .

The memory 41 may store, in advance, a predetermined amount of electric energy and a required capacity for starting and driving the first and second thrusters 31 and 32 in the customer-side load in the floating structure.

The supply part 42 is supplied from the at least one of the first to third diesel generators 11, 12, 13 to the consumer-side load in the floating structure by the reference to the memory 41 via the main bus 31. Supply energy. At this time, the electric energy of the shaft generator 14 is also used when the first to third diesel generators 11, 12, 13 are insufficient, but the shaft generator 14 is mainly used when driving a thruster requiring a large capacity. .

The receiving unit 43 receives the eyepiece request signal to the port.

The calculation unit 44 calculates the amount of electric energy being supplied to the consumer load from the first to third diesel generators 11, 12, 13 in response to the eyepiece request signal received by the receiver 43. In addition, the calculator 44 calculates the amount of electric energy that can be driven by subtracting the amount of electric energy in use from the total amount of electric energy for each diesel generator.

The determination unit 45 may refer to the required capacities of the first and second thrusters 31 and 32 stored in the memory 41 and use the first and second electric energy amounts calculated by the calculation unit 44. It is determined whether the thrusters 31 and 32 can be driven.

When the first and second thrusters 31 and 32 can be driven by the amount of electric energy calculated as a result of the determination by the determination unit 45, that is, the first to third diesel generators 11, 12, and 13 from the first. And when the second thrusters 31 and 32 can be driven, the controller 46 may include the tenth and eleventh switches S10 installed between the first and second thrusters 31 and 32 and the sub-bus 22, respectively. , S11 is closed, and the second, fourth and eighth switches S2, S4 and S8 respectively installed between the first to third diesel generators 11, 12 and 13 and the sub sub 22 are closed. Apply the ON signal to the switch. Accordingly, the first to third diesel generators 11, 12, and 13 may supply electrical energy to the first and second thrusters 31 and 32 via the corresponding switch and the sub-bus 22.

When it is impossible to drive the first and second thrusters 31, 33 with the calculated amount of electric energy as a result of the determination by the determination unit 45, that is, the first to third diesel generators 11, 12, 13 from the first. And when the driving of the second thrusters 31 and 32 is impossible, the controller 46 may connect the shaft generator 14 and the second thruster 32 to the shaft generator 14 and the second thruster 32. The sixth switch S6 provided therebetween is turned on, and the eleventh switch S11 provided between the subbus 22 and the second thruster 32 is turned off. Accordingly, the shaft generator 14 has a structure directly connected to the second thruster 32, so that the required capacity of the second thruster 32 can be supplied from the shaft generator 14, thereby piercing the port. You can do that.

When the amount of electric energy calculated as a result of the determination by the determination unit 45 exceeds the required capacity of the first thruster 31 but is insufficient as the required capacity of the first and second thrusters 31 and 32, the controller 46 Associated switches, i.e., second, fourth, eighth and tenth switches S2, S4, S8, such that electrical energy is supplied to the first thruster 31 from the first to third diesel generators 11, 12, 13; Control at least two of S10, and control the relevant switches, that is, the sixth and eleventh switches S6 and S11, so that electrical energy is directly supplied to the second thruster 32 from the shaft generator 14.

The power management method of the power management system having such a configuration will be described below.

3 is a flowchart illustrating a power supply method of a power management system according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the power management control panel 40 may include the first to third diesel generators 11, 12, and 13 based on the amount of electric energy to be supplied to the consumer load in the floating structure stored in the memory 41 during navigation. Supplying electrical energy to the consumer-side load in the floating structure through at least one of the generators (S11). In this case, when the amount of electric energy of the first to third diesel generators 11, 12, 13 is insufficient, the shaft generator 14 is also supplied with electric energy.

Thereafter, the power management control panel 40 determines whether the eyepiece request signal to the port has been received (S13).

When the eyepiece request signal to the port is not received as a result of the determination of step S13, the power management control panel 40 moves the process to the above-described step S11 to supply the electric energy during navigation to drive the customer load.

When the eyepiece request signal to the port is received as a result of the determination in step S13, the power management control panel 40 calculates the amount of electric energy in use by the consumer load in the floating structure, and calculates the calculated amount of electric energy and the total electricity of the generator. The amount of electric energy that can be driven to the first and second thrusters 31 and 32 is calculated through the difference with the energy capacity (S15).

The power management control panel 40 determines whether the first and second thrusters 31 and 32 can be driven by the calculated amount of electric energy that can be driven (S17).

As a result of the determination in step S17, when the first and second thrusters 31 and 32 can be driven by the calculated amount of driveable electric energy, the power management control panel 40 may include the first to third diesel generators 11,. 12, 13 and the switch installed between the sub-bus 22 to turn on the electrical energy from the first to third diesel generators (11, 12, 13) via the sub-bus 22, the first and second thrusters It supplies to (31, 32) (S19).

As a result of the determination in step S17, when the first and second thrusters 31 and 32 are impossible to drive due to the calculated amount of electric energy available for driving, the power management control panel 40 controls the shaft generator 14 and the second thruster. In the shaft generator 14, the sixth switch S6 disposed between the stirrers 32 is closed and the eleventh switch S11 installed at the sub sub 22 and the second thrusters 32 is controlled to open. Electrical energy is directly supplied to the second thruster 32 (S21). In addition, the power management control panel 40 interrupts the sixth switch S6 and the eleventh switch S11 when the abnormality of the sub-bus 22 is detected, and does not pass the sub-sub 22 to the shaft generator 14. Can supply electrical energy directly to the second thruster 32, enabling berthing to the port. Accordingly, even if the sub-bus 22 is abnormal, berthing to the port is possible, and the sub-bus 22 can be repaired safely at the port. It is also possible to supply electrical energy directly to the second thruster 32 located on the bow side directly from the shaft generator, so as to calculate the amount of electrical energy that can be driven by the first to third diesel generators 11, 12, 13 and then the first. And berthing to the port much faster than driving the second thrusters 31, 32.

This allows quick docking to the port, and has a sub-bus for supplying electrical energy to the thruster, which is different from the main bus for supplying electrical energy to the consumer-side loads in the floating structure. It is possible to minimize the burden on the degree of locking caused by frequent use of the tester.

The invention being thus described, it will be obvious that the same way may be varied in many ways. Such modifications are intended to be within the spirit and scope of the invention as defined by the appended claims.

11, 12, 13: first to third diesel generator 14: shaft generator
21: sailing main bus 22: eyepiece sub-bus
31, 32: first and second thrusters
40: power management control panel 41: memory
42: supply unit 43: receiving unit
44: calculation unit 45: judgment unit
46: control unit

Claims (8)

A plurality of main generators, shaft generators connected to the shafts of engines disposed in the floating structure to produce electrical energy by rotation of the shafts, and first and second thrusters for generating thrust to fold the floating structure into the harbor. A power management system for a floating structure including a stirrer,
Each of which is connected to the plurality of main generators and the shaft generators, and supplies electrical energy from at least one of the plurality of main generators and the shaft generators to a load on a customer side in the floating structure. A voyage main bus connected to the load on the customer side; And
The first and second thrusters respectively connected to the plurality of main generators and the shaft generators to supply electrical energy from at least one of the plurality of main generators and the shaft generators to the first and second thrusters. Power management system for a floating structure including an eyepiece sub-bus connected to the thruster. The method according to claim 1,
A power management control panel for monitoring electric energy amounts of the plurality of main generators and the shaft generators, and distributing a predetermined capacity from the plurality of main generators to the load on the customer side;
A pair of switches respectively provided between the plurality of main generators, the navigation main bus and the eyepiece sub-bus, and installed between the shaft generator, the navigation main bus and the second thruster; And
And a thruster dedicated switch disposed between the eyepiece sub-bus and the first and second thrusters, respectively. The method according to claim 2,
The power management control panel
Receiving unit for receiving the eyepiece request signal to the port;
A calculator configured to calculate an amount of electric energy that can be driven by the plurality of main generators and shaft generators to drive the first and second thrusters according to the eyepiece request signal received by the receiver;
A determination unit determining whether the first and second thrusters can be driven by the calculated amount of electric energy; And
If it is determined that the determination unit is capable of driving the first and second thrusters from the at least one generator preset among the plurality of main generators and shaft generators to the first and second thrusters through the eyepiece sub-bus. Floating structure characterized in that the control to supply each of a predetermined amount of electrical energy for each generator, and to receive the electrical energy directly from the shaft generator when the drive of the first and second thruster is determined as a result of the determination unit Power management system. The method according to claim 2,
The power management control panel
When an abnormality of the eyepiece sub-bus is detected, the switch between the shaft generator and the second thruster is closed so that electrical energy is supplied directly from the shaft generator to the second thruster, and the eyepiece sub-bus and the And a thruster dedicated switch between the second thrusters. The method according to claim 1,
The first thruster is a stern thruster (Stern thruster) located at the stern,
The second thruster is a power thruster system, characterized in that the bow thrust (Bow thruster) located in the bow. As a power management system for floating structures,
A nautical main bus connected with a plurality of main generators and shaft generators for supplying electrical energy to a load on a customer side in the floating structure;
An eyepiece sub-bus installed to be spaced apart from the main bus and connected to the plurality of main generators and the shaft generators to supply electrical energy to first and second thrusters installed at ends of the floating structure; And
The amount of driveable electric energy calculated by calculating the amount of driveable electric energy remaining after supplying to the load from the plurality of main generators to the first and second thrusters when docking to the port of the floating structure. Power management of a floating structure including a power management control panel for directly connecting the shaft generator and the second thruster to supply electrical energy of the shaft generator to the second thruster when the thruster is smaller than a required capacity of the two thrusters. system. A plurality of main generators, shaft generators connected to the shafts of engines disposed in the floating structure to produce electrical energy by rotation of the shafts, and first and second thrusters for generating thrust to fold the floating structure into the harbor. A power management method of a power management system including a master,
Calculating an amount of electrical energy that can be driven from the plurality of main generators when the floating structure requests an eyepiece to a port;
Determining whether the first and second thrusters can be driven based on the calculated amount of electrical energy; And
As a result of the determining in the determining step, if the first and second thrusters can be driven using the calculated electric energy amount, the calculated electric energy amount is supplied to the first and second thrusters and the calculated electric energy is supplied. And directly connecting the second thruster and the shaft generator and supplying electrical energy from the shaft generator to the second thruster if the first and second thrusters cannot be driven by the amount of energy. How to manage power in the management system. The method of claim 7,
The supplying step
A switch provided between the plurality of main generators and the eyepiece sub-bus, and the eyepiece sub, if the first and second thrusters are capable of driving the first and second thrusters with the calculated amount of electric energy. A switch installed between the plurality of main generators and the eyepiece sub-bus, if the switch installed between the bus and the first and second thrusters is closed, and a single thruster can be driven by the calculated amount of electric energy; And closing a switch provided between the eyepiece sub-bus and the first thruster, and opening a switch provided between the eyepiece sub-bus and the second thruster.

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