Power system for work platform and work platform

Abstract

To provide a power system for operating a motor in a thruster by using the output of another power supply or its converted output for the output of an AC power supply for outputting an AC insufficient for operating the motor in the thruster.SOLUTION: The switchboard 102 and the power storage system 101 are connected to each other so as to be capable of bidirectional AC output. The power storage system 101 can not only convert an AC output of the switchboard 102 into a DC output and output the DC output to the secondary battery 103, but also convert a DC output of the secondary battery 103 into an AC output and output the AC output to the switchboard 102. An AC power supply 104 is also connected to the switchboard 102. The switch board 102 synchronizes and combines the outputs of the AC power source 104 and the AC outputs sent from the power storage system 101, and outputs the combined outputs to either of the matrix converters 111a and 111b. The matrix converters convert the signals into signals having a cycle or the like suitable for the operation of the thrusters 112a and the motors in the 112b and then output the signals to the thrusters.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a work barge, particularly one including an AC power source and a secondary battery. [Background technology]

[0002] Work barges are used as platforms for various equipment during dredging and bottom improvement work. Work barges do not have a power plant for propulsion, and are often moved by being pushed and pulled by tugboats. As is clear from the method of movement, work barges are mainly used in ports and nearby waters. Therefore, work barges are often required to be quiet.

[0003] The term "work barge" here includes not only non-self-propelled vessels but also self-propelled vessels. Furthermore, the term "self-propelled vessel" is defined as "a vessel without a propulsion engine or sailing" as stipulated in Article 2, Paragraph 2, Item 3 of the Enforcement Regulations of the Ship Safety Act.

[0004] Work barges are often equipped with multiple devices depending on the work purpose of the barge, such as pin roller jacks, cranes, dredging grabs, etc. As mentioned above, if the work barge is self-propelled, it will also be equipped with a motor (electric motor) to move itself.

[0005] Typically, work barges are equipped with generators that generate electricity and power various devices, including the motors that drive the barges themselves. These motors drive not only conventional propellers but also pump jets (water jets).

[0006] Naturally, the work barge does not move during work. In some cases, the generator that runs the motor for transportation may be lowered from the work barge in order to efficiently operate the generator that runs the electric motor.

[0007] Also, due to their nature, work barges are often only able to travel short distances under their own power, and the distances they can travel using their own motors are not very long. When traveling long distances, they must be moved using push boats or tugboats.

[0008] There are various prior documents regarding ships that are self-propelled and have generators and electric motors. Japanese Patent Application Laid-Open No. 2023-141846 (Patent Document 1) discloses prior art relating to a battery-mounted electric propulsion ship system including an AC generator, an AC load, a secondary battery that stores DC electricity, and an AC motor for propulsion. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] JP 2023-141846 A Summary of the Invention [Problem to be solved by the invention]

[0010] However, the invention described in Patent Document 1 is basically propelled by power stored in a secondary battery, and only when the power in the secondary battery runs out does it start to rotate an AC generator to drive the AC motor for propulsion and begin charging the secondary battery. In other words, the AC generator described in Patent Document 1 is required to have the power generation capacity to run the AC motor and charge the secondary battery at the same time. As a result, it is impossible to prevent the price of the entire system from rising.

[0011] The present invention aims to reduce the required power generation capacity of the AC generator and enable the use of a low-cost generator by using power from a secondary battery to assist the generator in generating electricity and running the AC motor at full power.

[0012] Another object of the present invention is to construct a system that performs time-sharing control of the two propeller shafts, so that the motors of the two propeller shafts assist each other when the secondary battery is discharged, thereby enabling the work barge to move at a constant speed even when the secondary battery is not charged.

[0013] Furthermore, the object is to construct a system in which the generator for the travel motor and the generator for the work equipment assist each other depending on the usage situation, so that the work barge can be moved at a constant speed even when the secondary battery is not charged.

[0014] The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings. [Means for solving the problem]

[0015] A typical power system for a work barge related to the present invention includes a storage system that converts DC power from a secondary battery into AC power, an AC power source, a distribution board to which the output of the AC power source and the AC output from the storage system are input, a first converter, and a second converter, and this distribution board is characterized by synchronizing the phase and period of the output of the AC power source with the phase and period of the AC output output from the storage system to create a single output and providing a large output to either the first converter or the second converter.

[0016] This power system for a work barge may be characterized in that a first converter is connected to a first thruster, and the first converter having a high output converts the high output into AC suitable for operating the first thruster and inputs it into the first thruster.

[0017] This power system for a work barge may be characterized in that a second thruster is connected to the second thruster, and the second converter converts the input to the second converter into alternating current suitable for operating the second thruster and inputs it to the second thruster.

[0018] This power system for a work barge may be characterized in that the first thruster and the second thruster are arranged to face each other on the same axis.

[0019] These power systems for work barges may be characterized in that the first converter and the second converter are matrix converters.

[0020] These power systems for work barges may be characterized in that the first thruster and the second thruster are identical.

[0021] Another representative power system for a work barge related to the present invention includes a first storage system, a second storage system, and a DC power control unit that receives the DC output of the first storage system and the DC output of the second storage system and outputs DC to a steady load, and is characterized in that the DC power control unit controls the DC output of the first storage system and the DC output of the second storage system.

[0022] This power system for a work barge may be characterized in that the DC power control unit controls the DC output of the first power storage system and the DC output of the second power storage system in accordance with the DC output to the stationary load.

[0023] The power system for a work barge according to claim 7 or 8, A power system for a work barge, characterized in that a first secondary battery is connected to the first power storage system, and the power storage system controls output to the DC power control unit based on the remaining battery charge of the first secondary battery and the AC conversion of the power storage system.

[0024] This power system for a work barge may be further characterized in that it controls output to the DC power control unit based on information from the DC power control unit.

[0025] Another representative power system for a work barge related to the present invention includes a first AC power source, a second AC power source, and an AC power control unit to which the output of the first AC power source and the output of the second AC power source are input, and is characterized in that the AC power control unit outputs the output of the first AC power source and the output of the second AC power source to a first distribution board and a second distribution board.

[0026] This power system for a work barge may be characterized in that it outputs the output of the first AC power source and the output of the second AC power source to the first distribution board and the second distribution board based on information transmitted from the first distribution board and information transmitted from the second distribution board.

[0027] This power system for a work barge may further be characterized in that it outputs a first AC power supply output and a second AC power supply output to the first distribution board and the second distribution board based on the thrust generated by the first distribution board and the thrust generated by the second distribution board.

[0028] Another representative power system for a work barge related to the present invention includes an AC power source and an AC power control unit to which the output of the AC power source is input, and the AC power control unit outputs the output of the AC power source to a first distribution board and a second distribution board.

[0029] This power system for a work barge may be characterized in that it outputs AC power to the first distribution board and the second distribution board based on information transmitted from the first distribution board and information transmitted from the second distribution board.

[0030] This power system for a work barge may further be characterized in that it outputs the output of the first AC power source and the output of the second AC power source to the first distribution board and the second distribution board based on the total thrust generated by the first distribution board and the total thrust generated by the second distribution board.

[0031] This power system for a work barge may be characterized in that the total thrust generated by the first distribution board and the total thrust generated by the second distribution board are input to the AC power control unit.

[0032] Another representative power system for a work barge related to the present invention includes a storage system that converts AC to DC and outputs it, a secondary battery, a DC collector panel that determines the destination of the DC output of the secondary battery and the storage battery, and a DC distribution panel that provides reference power for the inverter, and is characterized in that the DC distribution panel outputs the inverter's reference power to the inverter using the DC output of the secondary battery and the DC output of the storage system.

[0033] Another representative power system for a work barge related to the present invention includes a first power storage system that converts AC to DC and outputs it, a second power storage system that converts AC to DC and outputs it, a first secondary battery, a second secondary battery, a first DC collector panel that determines the destination of the DC output of the first power storage system and the first secondary battery, a second DC collector panel that determines the destination of the DC output of the second power storage system and the second secondary battery, and a DC distribution panel that provides reference power for the inverter, and is characterized in that the DC distribution panel outputs the inverter's reference power to the inverter using the output of the first DC collector panel and the output of the second DC collector panel.

[0034] The work barge according to the present invention may be characterized by using any one of these power systems. [Brief explanation of the drawings]

[0035] [Figure 1] FIG. 2 is a block diagram showing the configuration of a power distribution line inside the work barge according to the first embodiment. [Figure 2] FIG. 2 is a top view showing where each thruster is arranged on the work barge in the first embodiment of the present invention. [Figure 3] FIG. 2 is a conceptual diagram showing the perspectives from which the features of each AC section of the power system and its peripheral components are designed in the first embodiment. [Figure 4] FIG. 10 is a block diagram showing the configuration of a power distribution line inside a work barge according to a second embodiment. [Figure 5] FIG. 10 is a plan view of the work barge showing where each thruster is arranged on the work barge in the second embodiment. [Figure 6] FIG. 10 is a block diagram showing the configuration of a power distribution line inside a work barge according to a third embodiment. [Figure 7] FIG. 10 is a block diagram showing the configuration of a power distribution line inside a work barge according to a fourth embodiment. [Figure 8] FIG. 13 is a diagram illustrating movement in the fourth embodiment. [Figure 9] FIG. 10 is an explanatory diagram showing time division according to the fourth embodiment. [Figure 10] FIG. 10 is a diagram illustrating movement according to the fourth embodiment. [Figure 11] FIG. 10 is a plan view of the work barge showing where each thruster is arranged on the work barge in the fifth embodiment. [Figure 12] FIG. 13 is a block diagram showing the configuration of a power distribution line inside a work barge according to a sixth embodiment. [Figure 13] FIG. 13 is a block diagram showing the configuration of a power distribution line inside a work barge according to a seventh embodiment. [Figure 14] FIG. 13 is a block diagram showing the configuration of a power distribution line inside a work barge according to an eighth embodiment. [Figure 15] FIG. 13 is a block diagram showing a partial configuration of a power distribution line inside a work barge according to an eighth embodiment. [Figure 16] FIG. 13 is a block diagram showing the configuration of a power distribution line inside a work barge according to the ninth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0036] (First embodiment) A first embodiment of the present invention will be described below with reference to the drawings.

[0037] FIG. 1 is a block diagram showing the configuration of a power distribution line inside a work barge 100 according to a first embodiment of the present invention. The power system of the work barge 100 according to this embodiment includes an electricity storage system 101 , a switchboard 102 , a secondary battery 103 , an AC power source 104 , a matrix converter 111 , a thruster 112 , and a stationary load 500 .

[0038] Of these, the part comprising the power storage system 101, the power distribution board 102, the matrix converter 111, and the thruster 112 is referred to as a "power supply system."

[0039] In addition, power is transmitted between each component in this diagram as either AC or DC. In this diagram, DC is represented by an outlined arrow, and AC is represented by a hatched arrow. However, the AC in this diagram does not all have the same characteristics, such as amplitude and frequency, and the DC does not all have the same characteristics, such as maximum voltage. This will be explained in Figure 3.

[0040] The power storage system 101 includes a converter function that converts AC power sent from the switchboard 102 into DC power and outputs it to the secondary battery 103 and / or the steady load 500. The power storage system 101 also includes an inverter function that converts DC power output from the secondary battery into AC power with desired characteristics and outputs it to the switchboard 102.

[0041] The power distribution board 102 is a control power distribution board that outputs AC power output from the AC power source 104 to the power storage system 101 and each matrix converter 111. Furthermore, when the output from the AC power supply 104 alone is not enough to generate electric power, the switchboard 102 requests the power storage system 101 to convert the output of the secondary battery 103 into AC and output it to itself.

[0042] The secondary battery 103 is a secondary battery that stores DC power output from the power storage system 101 and outputs the stored power as required. There are various types of secondary batteries, such as lead-acid batteries, lithium-ion batteries, and all-solid-state batteries, but the present invention may use any type of battery as long as it is capable of being charged and discharged. The secondary battery 103 may also be configured to be detachable. It may also be configured by connecting multiple rechargeable batteries in series or parallel.

[0043] The secondary battery 103 and the power storage system 101 are connected by a battery interface BIF. This battery interface BIF is configured to allow a direct current to flow in both directions between the power storage system 101 and the secondary battery 103. This makes it possible to freely change the scale of the secondary battery 103 via the battery interface BIF.

[0044] The AC power supply 104 is an AC power supply in which the direction of current reverses at regular intervals. In the present invention, it is assumed that a squirrel-cage three-phase induction motor is used, but this is not necessarily limited to this.

[0045] The AC power supply 104 and the switchboard 102 are connected by an AC interface ACIF. This AC interface ACIF is configured to allow AC to flow in one direction from the AC power supply 104 to the switchboard 102. This makes it possible to freely change the scale of the AC power supply 104 via the AC interface ACIF within the design range.

[0046] The AC interface ACIF may also include a control signal for controlling the AC power supply 104 from the switchboard 102. If necessary during design, it is also possible to make necessary data for the AC power supply 104 available from the switchboard 102.

[0047] The matrix converter 111 is a power conversion device that connects nine bidirectional switches in a lattice (matrix) from the three-phase AC power supply 104 and directly generates any voltage and frequency. In this embodiment, the matrix converter 111 includes a #1 matrix converter 111a and a #2 matrix converter 111b.

[0048] The thruster 112 is a propulsion device that uses water jet propulsion (pump jet propulsion) or the like. In the context of ships, the term "thruster" is often used to refer to a "side thruster" that moves the ship laterally. However, in this embodiment, the front, back, left, and right directions are determined based on the propulsion shaft of each thruster, not the front, back, left, and right directions of the work barge. Therefore, whether or not it is on the "side" from the perspective of the work barge is meaningless.

[0049] The water jet system draws water in through an intake port on the bottom of the vessel, and the screw inside the water jet expels it forcefully from a nozzle at the rear, generating thrust. Conversely, reversing the screw inside the water jet does not generate thrust. Therefore, to move forward and backward with the same propulsion shaft, two thrusters with opposite thrust directions must be installed on the same shaft. This is explained in Figure 2.

[0050] In this embodiment, the thrusters 112 include a #1 thruster 112a and a #2 thruster 112b, which are used for forward and reverse movement using the same propulsion shaft, as described above. The thruster 112 in this embodiment generates a thrust using an alternating current motor (AC motor). Therefore, the speed of the built-in motor, the thrust of the thruster 112, etc. are determined by the frequency of the input AC power.

[0051] As is clear from the diagram, the matrix converter 111 and the thruster 112 are paired with the matrix converter 111a and the thruster 112a, and with the matrix converter 111b and the thruster 112b.

[0052] The steady load 500 refers to a load other than the thruster 112. In a work barge, the steady load 500 may be a light source for crew members at night or sanitary equipment, but is not necessarily limited to this. In addition, the steady load 500 in this embodiment shown in the figure is assumed to operate on DC power, but operating on AC power does not escape the scope of the present invention.

[0053] In this diagram, the steady-state load 500 and the power storage system 101 are connected by a DC interface DCIF. This DC interface DCIF is configured to allow a DC current to flow in one direction from the power storage system 101 to the steady-state load 500. This makes it possible to design a power supply system in accordance with the maximum load of the steady-state load 500 without particularly considering the details of the steady-state load 500.

[0054] The steady load 500 may be configured to be able to transmit information about the required power to the power storage system 101 via the direct current interface DCIF.

[0055] With this configuration, in the embodiment described below, a DC power control unit 501 is connected via a DC interface DCIF, and from there, a steady load 500 can be connected. As a result, it becomes possible to design the power supply system separately from the steady load 500.

[0056] Next, with reference to FIG. 2, how the thrusters are installed in the work barge 100 of this embodiment will be described.

[0057] As mentioned above, in a water jet propulsion device, no propulsive force is generated even if the motor in the thruster 112 is rotated in the reverse direction. Therefore, forward and reverse movement is achieved using two water jet propulsors. Figure 2 is a plan view of the work barge 100 showing where each thruster 112 is located on the work barge 100 in the first embodiment of the present invention.

[0058] The work barge 100 in this figure shows the hull form of the work barge 100 on the waterline. The work barge 100 in this embodiment has one propeller shaft p1, and in this embodiment, the #1 thruster 112a and #2 thruster 112b described in FIG.

[0059] The #1 thruster 112a and #2 thruster 112b are arranged on the same propulsion shaft p1, and their thrust directions are toward the outer periphery of the work barge 100 in the figure. In the figure, the thrust 112at of the #1 thruster 112a and the thrust 112bt of the #2 thruster 112b are shown as generating thrust in the outward direction. Therefore, if the thrusters are the same, even if both thrusters of the pair are driven simultaneously, they will cancel each other out, and the work barge 100 will not move.

[0060] In this embodiment, it is assumed that the #1 thruster 112a and the #2 thruster 112b are the same. That is, in this embodiment of the present invention, by arranging the thrusters 112 on the same axis, one of the thrusters 112 is in an idle state (standby state) while the other thruster 112 is in a thrust generating state. As a result, the AC power supply 104 and the secondary battery 103 can be designed so that only one of the two thrusters 112 is operated, that is, assuming that the upper limit of power consumption is that only one of the pair of matrix converter 111 and thruster 112 is operated (the other is in an idle state).

[0061] Next, the control of each component in this embodiment will be described. Figure 3 is a conceptual diagram showing the design perspective of the characteristics of each AC section of the power system and its peripheral components in this embodiment. This diagram focuses on the operation of the #1 thruster 112a. While this diagram focuses on the #1 thruster 112a, it goes without saying that the #2 thruster 112b is also controlled in a similar manner.

[0062] It is common for a power supply to operate in a power band or a torque band, and it is assumed that the AC power supply 104 of this embodiment will also operate in this manner. Therefore, the characteristics of the AC AC1 are determined by the characteristics of the AC power supply 104.

[0063] 1 and 3, the AC power supply 104 outputs AC AC1 to the switchboard 102. As described above, AC AC1 is determined to some extent by the characteristics of the AC power supply 104, so the characteristics of AC AC1 can be grasped at the design stage. Therefore, it can be said that control in the switchboard 102 is also easy.

[0064] If the #1 thruster 112a is driven by only the alternating current AC1, this alternating current AC1 can be output as is to the #1 matrix converter 111a.

[0065] However, if the output of the AC power supply 104 is minimized as much as possible, that is, if a low-output, inexpensive AC power supply 104 is used, the output of the AC1 alone will not be enough to power the #1 thruster 112a, which operates at nearly full power. Therefore, the main point of the present invention is to convert the direct current output (not shown in FIG. 3) of the secondary battery 103 into AC, output it as AC5 to the switchboard 102, and assist the AC1 (i.e., combine AC1 and AC5) to operate the #1 thruster 112a at nearly full power.

[0066] From the above perspective, in order to actually operate the #1 thruster 112a at full capacity, it is essential to fully charge the secondary battery 103. In other words, it is necessary to charge the secondary battery using the AC power supply 104 when the #1 thruster 112a is not in operation, such as before operation or at night.

[0067] During such charging, the distribution board 102 does not need to output AC1 to the #1 matrix converter 111a, and outputs AC1 as AC4 directly to the power storage system 101. The power storage system 101 converts this AC4 into AC-DC and charges the secondary battery 103.

[0068] When charging of the secondary battery 103 is completed to a desired level, if necessary, the power storage system 101 notifies the AC power source 104 that charging has been completed, and the AC power source 104 ends its operation.

[0069] Let's go back to the topic of assists. When the output from the AC power supply 104 alone is not enough to operate the #1 thruster 112a, the AC power AC1 output to the switchboard 102 and the AC power AC5 input from the power storage system 101 to assist the AC power AC1 are input to the switchboard 102. The trigger for inputting the AC power AC5 is to issue a warning from the switchboard 102 to the power storage system 101 that there is insufficient power.

[0070] In this case, the characteristics of AC1 and AC5, i.e., voltage, phase, and frequency, should be the same. Therefore, the switchboard 102 notifies the power storage system 101 of the voltage, phase, and frequency of AC1, and the power storage system 101 performs DC-AC conversion based on these.

[0071] The power distribution board 102 combines the input AC1 and AC5 to generate AC2, which is then output to the #1 matrix converter 111a. The #1 matrix converter 111a can reduce conversion costs by directly converting the received AC2 into AC3, which is then converted into a frequency suitable for operating the #1 thruster 112a. The #1 thruster 112a operates using this AC AC3.

[0072] By operating in the above manner, it becomes possible to use a low-output, inexpensive AC power supply 104. In addition, it becomes possible to operate two thrusters 112 on the same propulsion shaft with an AC power supply 104 having almost the output of one thruster.

[0073] (Second embodiment) Next, a second embodiment of the present invention will be described with reference to the drawings. Fig. 4 is a block diagram showing the configuration of the power distribution lines inside the work barge 100 according to the second embodiment of the present invention. Fig. 5 is a plan view of the work barge 100 showing where each thruster 112 is arranged on the work barge 100 according to the second embodiment of the present invention.

[0074] As is clear from Figure 4, the basic configuration is not very different from the first embodiment. In this second embodiment, the number of power supply systems in the first embodiment is increased to two. This is intended to provide two propulsion axes, the X axis and the Y axis.

[0075] As is clear from Figure 5, the work barge 100 in this embodiment has two propulsion axes, the X-axis p1 and the Y-axis p2, which are perpendicular to each other. The #1 thruster 112a and the #2 thruster 112b are arranged on the X-axis p1, and the #3 thruster 112c and the #4 thruster 112d are arranged on the Y-axis p2. As in the first embodiment, these are installed so that they can exert thrust in opposite directions.

[0076] As the names X-axis p1 and Y-axis p2 suggest, the thrusters 112 arranged on each orthogonal propulsion shaft do not affect the other propulsion shafts. Therefore, by arranging two power supply systems and their peripheral components, it becomes possible to control each propulsion shaft independently.

[0077] In Fig. 4, the steady load 500 of the first embodiment is divided into a #1 steady load 500a and a #2 steady load 500b. If the #1 steady load 500a is for lighting purposes and the #2 steady load 500b is for sanitary purposes, etc., and they are separated from each other, the design becomes easier. The capacity of each secondary battery 103a, 103b may vary depending on the steady load, but it goes without saying that any battery is within the scope of the present invention.

[0078] In this way, in this embodiment, 1) the X-axis and Y-axis are separated into separate systems so that they do not interfere with each other, and 2) the X-axis and Y-axis are controlled independently, making it possible to move in two directions with a system that is almost the same as the first embodiment, although the number is doubled. As a result, when a fault occurs under steady-state load, it becomes easier to identify the location of the fault.

[0079] (Third embodiment) Next, a third embodiment of the present invention will be described with reference to the drawings. The third embodiment is a slight improvement of the second embodiment. FIG. 6 is a block diagram showing the configuration of the power distribution lines inside a work barge 100 according to the third embodiment of the present invention.

[0080] In the second embodiment, the steady-state load is divided into two in consideration of ease of design, completely dividing the power system into two and making circuit design easier. However, in reality, there are many cases where it is desirable to process the load collectively.

[0081] The third embodiment is characterized in that a DC power control unit 501 that handles stationary loads 500 collectively is provided. The DC power control unit 501 is a control circuit that requests the power storage systems 101a and 101b to transmit power in accordance with the amount of power required by the stationary load 500.

[0082] At this time, the DC power control unit 501 refers to the following values. ◇Current power consumption of steady load 500 ◇Remaining battery capacity of the secondary battery 103a transmitted from the power storage system 101a ◇Remaining battery capacity of the secondary battery 103b transmitted from the power storage system 101b ◇Current amount of power transmitted from the power storage system 101a to the power distribution board 102a ◇Current amount of power transmitted from the power storage system 101b to the switchboard 102b It is not necessary to refer to only this value, and DC power control unit 501 may refer to other values.

[0083] The DC power control unit 501 transmits the amount of power to be transmitted to each power storage system and transmits the received DC power to the steady load 500, thereby making it possible to optimize the consumption of the secondary batteries 103a and 103b.

[0084] (Fourth embodiment) Next, a fourth embodiment of the present invention will be described with reference to the drawings. The third embodiment relates to a DC power control unit 501 that controls the power on the DC side. In contrast, the fourth embodiment is characterized by the provision of an AC power control unit 105.

[0085] 7 is a block diagram showing the configuration of the power distribution lines inside the work barge 100 according to the fourth embodiment of the present invention. Note that the arrangement of the thrusters 112 in this embodiment is the same as that in the second embodiment, i.e., Fig. 5, and therefore will not be described further.

[0086] First, the focus of this embodiment will be described. In the second embodiment and this embodiment, that is, the embodiment having two orthogonal propulsion shafts, the arrangement of the thrusters 112 shown in FIG. 5 is applied as is.

[0087] FIG. 8 is a diagram illustrating movement in the fourth embodiment. Generally, work barges are not required to travel tens to hundreds of kilometers across the open ocean, and are limited to a relatively small work area. Therefore, excluding the obstacles caused by shallow water below the waterline, they can be moved in a straight line.

[0088] In other words, as shown in Figure 8, if the desired amount of thrust is given to the two propulsion shafts, the ship can usually travel straight to the desired point through vector synthesis.

[0089] Here we will review the power consumption of the thrusters associated with each propulsion shaft. As explained in the first embodiment, even if thrusters 112 (for example, #1 thruster 112a and #2 thruster 112b) that are on the same propulsion shaft and belong to the same power supply system are simultaneously driven with the same thrust, they simply cancel each other out. Therefore, in actual work, the operator of the work barge will use one of the thrusters 112 arranged on the same propulsion shaft. In other words, the power used by one propeller shaft (= one power supply system) is ◇Electricity used to idle two thrusters 112 ◇The power required to operate one thruster 112 at full power In the first embodiment of the present invention, it is defined at the design stage what percentage of this power is to be supplied by the secondary battery 103, and the remainder is to be handled by the output of the AC power supply 104.

[0090] In this embodiment, instead of moving each propulsion shaft (=each power supply system) simultaneously as described above, it is assumed that the X-axis or Y-axis is moved in a time-division manner. This makes it possible to move the work barge without relying on the charge of the secondary battery 103.

[0091] Fig. 9 is an explanatory diagram showing time division according to the fourth embodiment of the present invention, and Fig. 10 is a diagram explaining movement according to this embodiment.

[0092] In the present invention, it is considered that all thrusters 112 are the same and a constant power is input, and the amount of thrust is changed depending on the time when power is applied to the thrusters.

[0093] If all the thrusters 112 are the same, the input power to the #1 AC power supply 104a and the #2 AC power supply 104b can be kept constant during the period shown in Fig. 9. The AC power control unit 105 switches the output destination to either the X-axis p1 or the Y-axis p2, which is a feature of this embodiment.

[0094] First, generate thrust in the Y direction for a time period equivalent to 25% of the expected movement, then generate thrust in the X direction for a time period equivalent to 50% of the expected movement. Furthermore, a thrust is generated in the Y direction for 50% of the estimated movement amount, and a thrust is generated in the X direction for 50% of the estimated movement amount.

[0095] Finally, if a thrust is again generated in the Y direction for a time period corresponding to 25% of the expected movement amount, it becomes possible to move the work barge 100 along a movement path similar to that of the second embodiment, as shown in FIG.

[0096] To achieve this operation, it is necessary that 1) the characteristics of the #1 AC power supply 104a and the #2 AC power supply 104b, such as frequency and phase, match, and 2) both the #1 AC power supply 104a and the #2 AC power supply 104b operate in their power bands during this period. The former is a prerequisite for the operation of a specific thruster 112, and the latter is a prerequisite for efficient operation of the AC power supplies 104.

[0097] That is, the AC power control unit 105 It is determined whether or not the two AC power supplies 102 of this embodiment are to operate in coordination. When performing coordinated operation, the characteristics of the two AC power supplies 102, such as their phases, are matched. ◇Switch the output destination of the synthesized AC output depending on the time. If cooperative operation is not performed, the processing of the second embodiment is performed. It needs to include functionality such as:

[0098] By doing so, it becomes possible to operate the work barge even when the secondary battery 103 does not have sufficient stored power.

[0099] In the above, the time axis is divided into five parts and the propulsion shaft is switched, but more divisions may be used. Also, even if the output is changed between normal and emergency situations, such as using 80% of the thruster 112 during normal times (when the output of the AC power source 104 and the output of the power storage system 101 are used in combination), but using 100% of the thruster 112 during this embodiment, this does not deviate from the scope of this embodiment.

[0100] (Fifth embodiment) Next, a fifth embodiment of the present invention will be described with reference to the drawings. In the embodiments described above, the thrusters 112 are used only to generate thrust. In contrast to this, in this embodiment, it is assumed that the thruster 112 is used not only for generating thrust but also for generating moment.

[0101] FIG. 11 is a plan view of the work barge 100 showing where on the work barge 100 each thruster 112 is arranged in the fifth embodiment of the present invention. As is clear from this diagram, the first shaft p11 and the second shaft p12 are arranged in parallel. That is, in the second embodiment, the propeller shafts are perpendicular to each other and do not affect each other. In contrast, the present embodiment is characterized by the fact that the two propeller shafts are arranged in parallel.

[0102] In this embodiment and in Figure 11, directions are often used to describe the work barge, so they are written as "rightward" and "leftward" on the drawing. Also, since there are many explanations of applying a moment to the work barge 100 to rotate it, the rotation direction of the work barge is written as "right rotation" and "left rotation." Please refer to the directions on the drawing for understanding the fifth embodiment.

[0103] Of the thrusters arranged on the two propulsion shafts, the thrust generated by the #1 thruster 112a and the #3 thruster 112c is directed in the same direction. These two thrusters generate thrust toward the left outside of the work barge 100 in FIG. Similarly, the thrust generated by the #2 thruster 112b and the #4 thruster 112d is directed in the same direction. In FIG. 11, these two thrusters generate thrust toward the right outside of the work barge 100.

[0104] When moving forward or backward along the propulsion shaft, the same thrust is generated by the thrusters 112 of the same direction on each propulsion shaft. That is, when the #1 thruster 112a and the #3 thruster 112c generate the same thrust in the left direction in Figure 11, the work barge 100 moves to the right. Similarly, when the #2 thruster 112b and the #4 thruster 112d generate the same thrust in the right direction in Figure 11, the work barge 100 moves to the left.

[0105] On the other hand, what happens if a moment is generated on the work barge 100? When rotating the work barge 100 to the right, ◇Provide thrust only to #1 thruster 112a. ◇Provide thrust only to #4 thruster 112d. ◇Thrust is applied to the #1 thruster 112a and the #4 thruster 112d. Each of the following cases can be considered.

[0106] In addition, to rotate the work barge 100 counterclockwise, ◇Provide thrust only to #2 thruster 112b. ◇Provide thrust only to #3 thruster 112c. ◇Thrust is applied to the #2 thruster 112b and the #3 thruster 112c. Each of the following cases can be considered.

[0107] In either case, for the first two cases ("only providing thrust"), the maximum power is the idling power of two thrusters plus the full thrust power of one thruster. Also, when two thrusters are operating, the maximum power is the idling power of four thrusters plus the full thrust power of two thrusters.

[0108] In other words, even if the work barge is equipped with two propulsion shafts, it can be said that the capacity design of the secondary battery 103 per shaft can be the same as in the previous embodiments.

[0109] As described above, the circuit of the present invention can be used not only when the propeller shafts are perpendicular to each other, but also when the propeller shafts are parallel to each other to control a work barge by moment.

[0110] The block diagram showing the configuration of the power distribution line in the fifth embodiment is the same as that in the third or fourth embodiment, and therefore will not be shown here.

[0111] (Sixth embodiment) Next, a sixth embodiment of the present invention will be described with reference to the drawings. FIG. 12 is a block diagram showing the configuration of the power distribution lines inside a work barge 100 according to the sixth embodiment of the present invention.

[0112] The second and subsequent embodiments of the present invention basically use the power system of the first embodiment, In the second embodiment, two power supply systems are used as they are to avoid any adverse effects. In the third embodiment, an external circuit called a DC power control unit 501 is added to share a steady load between two power supply systems. In the fourth embodiment, the AC power supply 104 is shared between two power supply systems. (The fifth embodiment is not described here because it relates to the arrangement of the thrusters 112).

[0113] In this embodiment, it is assumed that the AC power supplies that have been provided one for each power supply system up to this point will be combined into one. FIG. 12 is a block diagram showing the configuration of the power distribution lines inside a work barge 100 according to the sixth embodiment of the present invention.

[0114] The work barge of the present invention has two propeller shafts that do not affect each other, as in the second and subsequent embodiments. Furthermore, in the fourth embodiment, an AC power control unit 105 was added, and two AC power sources 104a and 104b corresponding to the respective propeller shafts were shared. In contrast, this embodiment is characterized by the use of a single AC power source.

[0115] In order to achieve this configuration, it is important to check the remaining capacity of the secondary batteries 103a and 103b. Basically, the power supply system of the first embodiment is configured so that the secondary batteries supplement the output shortage of the AC power supply. Therefore, if the battery capacity of the secondary battery 103 is insufficient, it becomes necessary to use time-sharing control as in the fourth embodiment, that is, to use the AC power supply 104 of the other power supply system to replenish power and reduce the number of operating thrusters 112.

[0116] However, in this embodiment, since there is only one AC power supply 104, such power replenishment is not possible, so measures such as providing an AC power supply 104 that is larger than in other embodiments or using secondary batteries 103 with larger capacities are taken, and it is also important that AC power control unit 205 has the function of successively checking the capacity of each secondary battery 103. This reduces the number of expensive AC power sources, making it possible to provide a low-cost work barge.

[0117] In response to the above requirements, AC power control unit 205 in Fig. 12 has an interface for sequentially checking the capacity of each secondary battery 103. In Fig. 12, this is indicated by the dashed dotted lines extending from secondary batteries 103a and 103b to AC power control unit 205.

[0118] Also, AC power control unit 205 needs to be able to output a control signal to change the output to AC power supply 204. The dashed dotted line extending from AC power control unit 205 to AC power supply 205 in Fig. 12 corresponds to this control signal.

[0119] Then, the amount of power to be supplied to the switchboards 102a and 102b in the future is adjusted based on the remaining battery power and the amount of power currently being supplied to the switchboards 102a and 102b.

[0120] At this time, if a change in output is required from the AC power supply 104, the AC power control unit 205 instructs the AC power supply 204 to change the output. Needless to say, it is desirable to operate within the power band of the AC power supply 204 both before and after the change.

[0121] (Seventh embodiment) Next, a seventh embodiment of the present invention will be described with reference to the drawings. The seventh embodiment is a modification of the fourth embodiment.

[0122] As described in the fourth embodiment, the movement of the work barge is often short distances. Therefore, once the operator of the work barge 100 selects a destination, the vector composition of the propulsive forces is required. In this embodiment, an input device 106 is provided so that the operator of the work barge can directly input a desired future position.

[0123] Fig. 13 is a block diagram showing the configuration of the power distribution lines inside the work barge 100 according to the seventh embodiment of the present invention. The configuration is basically the same as that shown in Fig. 7 according to the fourth embodiment, but is characterized by the addition of an input device 106 and an interface between the input device 106 and the AC power control unit 105b.

[0124] The input device 106 is a device for the operator of the work barge 100 to input the desired future position of the work barge 100. Basically, it is assumed that relative position information, that is, input such as XX meters on the X axis and ◇◇ meters on the Y axis from the current position, is input, but absolute positions (north latitude, east longitude, etc.) can also be input.

[0125] The input device 106 is assumed to be a keyboard, a mouse, etc., but is not necessarily limited to these. For example, the input device 106 may be a HUD (Head Up Display), HMD (Head Mount Display), etc. The input device 106 transmits the input position information to the AC power control unit 105b.

[0126] Unlike the AC power control unit 105 of the fourth embodiment, the AC power control unit 105b receives future position information from the input device 106 and calculates the total thrust to be exerted by each thruster 112. Based on this calculation and the capacity of each secondary battery 103, the AC power control unit 105b determines whether to operate one or both of the propulsion shafts simultaneously, and determines an operation schedule for each thruster 112 accordingly. Then, power is supplied to each thruster based on this schedule.

[0127] In addition, when conditions are such that movement is absolutely impossible, such as movement onto land, measures should be taken such that the input device 106 does not send position information to the AC power control unit 105b.

[0128] In this way, when moving a short distance, the AC power control unit 105b processes information related to the position and controls the thruster 112, thereby reducing the burden on the operator of the work barge 100.

[0129] (Eighth embodiment) An eighth embodiment will now be described. The embodiments described so far have been premised on the operation of the water jet type thruster 112. In contrast, in this embodiment, the operation of a device unrelated to the movement of the work barge 100 is considered.

[0130] Before that, let us reconsider the thruster 112, which is the center of the embodiments described above. The water jet system generates thrust by drawing water in through an intake port on the bottom of the ship or the like and expelling it forcefully from a nozzle at the rear with a screw inside the water jet. Conversely, no thrust is generated even if the screw inside the water jet is rotated in the reverse direction. Therefore, in the embodiments described above, two matrix converters 111 are provided per axis under the control of the switchboard 102.

[0131] However, when the power supply system of the present invention is used for a crane or the like installed on the work barge 100, it is also possible to control the direction of rotation by reversing the motor. In such a case, rotation is possible even with only one motor installed.

[0132] In this embodiment, it is assumed that the crane or the like does not operate while the thruster 112 is operating (i.e., moving), but operates only while the thruster 112 is stopped. In this embodiment, a case is considered in which the power supply system of the present invention is used for a crane or the like other than the thruster 112.

[0133] Figure 14 is a block diagram showing the configuration of the power distribution lines inside the work barge 100 according to the eighth embodiment of the present invention. Basically, it is based on the configuration of the power distribution lines inside the work barge 100 shown in Figure 13, but it can also be applied to other embodiments. In this embodiment, it is assumed that thrusters subordinate to the switchboard 102b are connected to the crane #1 motor 114a and the crane #2 motor 114b of one crane.

[0134] The #5 matrix converter 111e and #6 matrix converter 111f are basically the same in configuration as the #1 matrix converter 111a, #2 matrix converter 111b, #3 matrix converter 111c, and #4 matrix converter 111d. However, while these matrix converters are not designed to reverse the operation of the corresponding thrusters 112, the #5 matrix converter 111e and #6 matrix converter 111f are designed to operate in both the forward and reverse directions.

[0135] The crane #1 motor 114a is an AC motor that rotates the rotation shaft of a crane (not shown). The crane #1 motor 114a is connected to the #5 matrix converter 111e. As described above, the crane #1 motor 114a is configured to be able to rotate in both the forward and reverse directions.

[0136] In contrast, crane #2 motor 114b is a linear motor that changes the arm length of the crane (not shown). As the name "linear" suggests, crane #2 motor 114b is a motor that moves the arm length of the crane in a straight line. Like crane #1 motor 114a, crane #2 motor 114b also moves in both forward and reverse directions, but unlike crane #1 motor 114a, which rotates, crane #2 motor 114b moves in a straight line. Therefore, crane #2 motor 114b has minimum and maximum distance settings and is not designed to move beyond those distances.

[0137] As explained above, the power system of the present invention operates only one motor under the control of the switchboard 102. Therefore, this embodiment also assumes that only one crane #1 motor 114a and one crane #2 motor 114b will be operated.

[0138] However, unlike the case of two thrusters 112 on the same propulsion shaft, the operation of rotating the crane arm (not shown) and the operation of extending and shortening the arm may be performed simultaneously. Therefore, the total power consumption of the two motors may be determined by the distribution board 102b as the sum of the maximum power generating capacity of the #2 AC power supply 104b and the maximum power generating capacity of the secondary battery 103b, and the distribution board 102b may allocate this to the crane #1 motor 114a and the crane #2 motor 114b to operate them simultaneously, thereby realizing an exceptional operation of the present invention.

[0139] In this embodiment, the same thrusters 112a and 112b are used. However, the crane #1 motor 114a and crane #2 motor 114b of the crane (not shown) have different uses, and therefore their characteristics will likely differ in most cases. Therefore, it will be difficult to realize the power exchange between the #1 AC power supply 104a and the #2 AC power supply 104b (as shown in FIG. 9). In such cases, it will be necessary to separately consider how to balance the #1 AC power supply 104a and the #2 AC power supply 104b at the design stage.

[0140] By doing so, it is possible to supply power to devices that are not used simultaneously with the thrusters, enabling the devices to operate.

[0141] As a minor modification, a switch can be provided to switch between the thruster 112 and the equipment. Fig. 15 is a block diagram showing a partial configuration of the power distribution lines inside the work barge according to the eighth embodiment. This figure assumes that the components subordinate to the switchboard 102b in Fig. 14 are replaced, and the other power distribution lines are the same as in Fig. 14.

[0142] Switches 121a and 121b are arranged directly below the switchboard 102b. Switch 121a is a switch that switches between operating either the #3 thruster 112c or the crane #1 motor 114a. On the other hand, switch 121b is a switch that switches between operating either the #4 thruster 112d or the crane #2 motor 114b.

[0143] The #3 thruster 112c and the crane #1 motor 114a are never operated at the same time. Also, the #4 thruster 112d and the crane #2 motor 114b are never operated at the same time. Therefore, by switching between these, it is possible to determine which one to operate depending on the situation of the work barge 100.

[0144] (Ninth embodiment) Finally, a ninth embodiment will be described with reference to the drawings. Up to this point, the embodiments have been described assuming the operation of an AC motor. In contrast, the ninth embodiment assumes the use of a thruster with an AC motor after DC is converted to AC by an inverter. Figure 16 is a block diagram showing the configuration of the power distribution lines inside a work barge according to the ninth embodiment of the present invention.

[0145] In the ninth embodiment, two matrix converters 111 are connected to each of the power distribution boards 102a and 102b. This is intended to operate the AC motors in the thrusters 112. Therefore, when a DC motor is used as in this embodiment, the matrix converter 111 is not connected to the switchboards 102a and 102b.

[0146] The power distribution boards 102a and 102b are connected to the power storage systems 101a and 101b, respectively. The operation of these power storage systems 101a and 102b is the same as that of the eighth embodiment. However, since there is no secondary battery, steady load, or motor on the power distribution board 102 side, there is no need to consider transmission from the power storage system 101 to the power distribution board 102.

[0147] The AC outputs from the distribution boards 102a and 102b to the power storage systems 101a and 101b are converted into DC in the power storage systems 101a and 101b and output to the DC current collector boards 132a and 132b.

[0148] The operation of DC current collector boards 132a and 132b changes depending on whether they are charging secondary batteries 103a and 103b or rotating the motor. When charging, the DC power input to DC current collector boards 132a and 132b is output directly to secondary batteries 103a and 103b, charging secondary batteries 103a and 103b.

[0149] On the other hand, when the motor is operating, the principle of superposition is used to generate a reference voltage for inverters 131a and 131b to perform DC-AC conversion, and the reference voltage is output to DC distribution board 133. However, at this point, it is not necessary to fully generate the reference voltage.

[0150] DC distribution board 133 also uses the superposition theorem to generate a reference voltage when inverters 131a and 131b perform DC-AC conversion. However, because DC distribution board 133 can use the outputs of both DC collector boards 132a and 132b, these can fully generate the reference voltage when inverters 131a and 131b perform DC-AC conversion.

[0151] The inverters 131a and 131b are inverter circuits that convert DC to AC using a DC reference voltage generated by a DC distribution board 133. Here, they generate AC with characteristics (frequency, current value, etc.) appropriate for use in the #1 thruster 112a and #2 thruster 112b, and operate each thruster.

[0152] Needless to say, inverters 131a and 131b will operate regardless of whether switchboard 102a or 102b is used as the main, since DC switchboard 133 is used to generate the reference voltage. Therefore, it is also possible to average out wear and tear on each component by switching between using switchboard 102a as the main and switchboard 102b as the sub on one day, and then using switchboard 102b as the main and switchboard 102a as the sub the next day.

[0153] In this way, providing an inverter on the DC side to operate an AC motor is also included in the scope of the present invention. In FIG. 15 relating to this embodiment, two thrusters are arranged, but the reason for using two thrusters is mainly due to the issue of drawing space, and it goes without saying that there is no problem with arranging four thrusters as in the past.

[0154] (summary) As described above, by providing thrusters in the positive and negative directions of the same propulsion shaft, and providing one power system including a secondary battery and an AC power source on one side of the thrusters, and by having the designer of the work barge estimate the load balance between the AC power source and the secondary battery based on actual operation at the design stage and determine the performance of the AC power source, it becomes possible to make the performance of the AC power source more affordable (first embodiment).

[0155] Furthermore, by providing a power system for each of the orthogonal propulsion shafts (X-axis and Y-axis in the above example) that do not affect each other, it becomes possible to design a work barge that can propel in 360 degrees (second embodiment).

[0156] Furthermore, by connecting two secondary batteries to one DC power control unit, it becomes possible to determine how much power the DC power control unit will receive from which secondary battery depending on the remaining battery charge of each secondary battery (third embodiment).

[0157] Furthermore, when the charge capacity of the secondary battery of one power system becomes insufficient, the AC power supply of the other power system can be used as a substitute, making it possible to continue propulsion even when the power of the secondary battery of one power system decreases. Furthermore, by using time-sharing control, it becomes possible to continue propulsion itself, although performance will be reduced (fourth embodiment).

[0158] Furthermore, even when they affect each other, providing two power systems makes it possible for them to function in conjunction with each other (fifth embodiment).

[0159] Furthermore, we have proposed combining the AC power supplies of the two power systems into one from the beginning (sixth embodiment).

[0160] It has also been disclosed that movement control by adjusting thrust is possible by inputting future position information into the AC power control unit (seventh embodiment).

[0161] Furthermore, it has been proposed that one power system can be used for propulsion purposes and another for work purposes (eighth embodiment).

[0162] Furthermore, we proposed providing an inverter on the DC side to operate an AC motor (ninth embodiment).

[0163] In the above description of the embodiments, elements of the preceding embodiments are described as being included in the following embodiments, but this is not necessarily the case. For example, although DC control section 501 is included in FIG. 7, the fourth embodiment can be realized even if it is not present (the DC control section 501 is not even explained in the fourth embodiment). Therefore, the absence of this section does not depart from the scope of the present invention.

[0164] Although the eighth embodiment focuses on the rotation of the crane and the extension of the arm, the present invention is not necessarily limited to this. The present invention can also be applied to objects that are not used when propelling the working barge, such as a dredging arm or a spud for fixing a position. [Industrial Applicability]

[0165] The present invention relates to an electric power system and its peripheral equipment for a work barge, but is not limited to this. It can also be applied to small vessels used for coastal travel.

[0166] In addition, although power is supplied from the power grid during idling in the above example, it is also possible to use a separate power grid for idling. In this case, it goes without saying that the power required for idling is excluded from the calculation of the maximum power required at the time of design. [Explanation of symbols]

[0167] 100: Work barge 101, 101a, 101b: Energy storage system 102, 102a, 102b: Switchboard 103, 103a, 103b: Secondary battery 104: AC power supply 104a: #1 AC power supply 104b: #2 AC power supply 105, 105b, 205: AC power control section 106: Input device 111: Matrix converter 112: Thruster 112a: #1 thruster 112b: #2 thruster 112c: #3 thruster 112d: #4 thruster 114a: Crane #1 motor 114b: Crane #2 motor 121, 121a, 121b: Switches 131: Inverter 132: DC current collector board 133: DC distribution board 204: AC power supply 500, 500a, 500b: Steady load 501: DC power control section

Claims

1. a power storage system that converts DC power from a connected secondary battery into AC power; an AC power source; a distribution board to which the output of the AC power supply and the AC output output from the power storage system are input; a first converter; a second converter, The power system for a work barge is characterized in that the distribution board synchronizes the phase and period of the output of the AC power source and the AC output output from the storage system to create a single output, and provides a large output to either the first converter or the second converter.

2. 2. The power system for a work barge according to claim 1, the first converter is connected to a first thruster; The first converter, which has a high output, converts the high output into AC suitable for operating the first thruster and inputs it into the first thruster.

3. 3. The power system for a work barge according to claim 2, the second thruster is connected to a second thruster; 1. A power system for a work barge, wherein the second converter converts an input to the second converter into AC suitable for operating the second thruster and inputs the AC to the second thruster.

4. 4. The power system for a work barge according to claim 3, wherein the first thruster and the second thruster are arranged so as to face each other on the same axis.

5. The power system for a work barge according to any one of claims 1 to 4, 1. A power system for a work barge, wherein the first converter and the second converter are matrix converters.

6. The power system for a work barge according to any one of claims 1 to 4, 1. A power system for a work barge, wherein the first thruster and the second thruster are equivalent.

7. a first power storage system; a second power storage system; a DC power control unit that receives a DC output from the first power storage system and a DC output from the second power storage system and outputs a DC current to a steady load, 10. A power system for a work barge, wherein the DC power control unit controls the DC output of the first power storage system and the DC output of the second power storage system.

8. 8. The power system for a work barge according to claim 7, a DC power control unit that controls the DC output of the first power storage system and the DC output of the second power storage system in accordance with the DC output to the steady-state load;

9. 9. The power system for a work barge according to claim 7 or 8, A power system for a work barge, characterized in that a first secondary battery is connected to the first power storage system, and the power storage system controls output to the DC power control unit based on the remaining battery charge of the first secondary battery and the AC conversion of the power storage system.

10. 10. The power system for a work barge according to claim 9, The power system for a work barge further controls output to the DC power control unit based on information from the DC power control unit.

11. a first AC power source; a second AC power source; an AC power control unit to which an output of the first AC power source and an output of the second AC power source are input, 1. A power system for a work barge, wherein the AC power control unit outputs the output of the first AC power source and the output of the second AC power source to a first distribution board and a second distribution board.

12. 12. The power system for a work barge according to claim 11, an output of the first AC power source and an output of the second AC power source are output to the first distribution board and the second distribution board based on information transmitted from the first distribution board and information transmitted from the second distribution board.

13. 13. The power system for a work barge according to claim 12, The power system for a work barge is further characterized in that the output of the first AC power source and the output of the second AC power source are output to the first distribution panel and the second distribution panel based on the thrust generated by the first distribution panel and the thrust generated by the second distribution panel.

14. an AC power source; an AC power control unit to which an output of the AC power source is input, The power system for a work barge is characterized in that the AC power control unit outputs the output of the AC power supply to a first distribution board and a second distribution board.

15. 15. The power system for a work barge according to claim 14, An electric power system for a work barge, characterized in that the output of the AC power supply is output to the first distribution board and the second distribution board based on information transmitted from the first distribution board and information transmitted from the second distribution board.

16. 16. The power system for a work barge according to claim 15, The power system for a work barge is further characterized in that the output of the first AC power source and the output of the second AC power source are output to the first distribution panel and the second distribution panel based on the total thrust generated by the first distribution panel and the total thrust generated by the second distribution panel.

17. 17. The power system for a work barge according to claim 16, wherein the total thrust generated by the first distribution panel and the total thrust generated by the second distribution panel are input to the AC power control unit.

18. A storage system that converts AC to DC and outputs it; A secondary battery; a DC current collector board that determines the destination of DC outputs from the secondary battery and the storage battery; A power system for a work barge including a DC distribution panel that provides a reference power for the inverter, a DC power distribution panel that outputs a reference power of the inverter to the inverter using the DC output of the secondary battery and the DC output of the power storage system;

19. a first power storage system that converts AC into DC and outputs the converted DC; a second power storage system that converts AC into DC and outputs the converted DC; a first secondary battery; a second secondary battery; a first DC current collector panel that determines destinations of DC outputs from the first power storage system and the first secondary battery; a second DC current collector panel that determines destinations of DC outputs from the second power storage system and the second secondary battery; A power system for a work barge including a DC distribution panel that provides a reference power for the inverter, A power system for a work barge, characterized in that the DC distribution panel outputs a reference power of the inverter to the inverter using the output of the first DC collector panel and the output of the second DC collector panel.

20. A work barge using the power system of any one of claims 1 to 19.

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