Power supply system for shipping

Abstract

To provide a power supply system for shipping, capable of preventing excitation rush current in connecting a transformer to an AC bus.SOLUTION: A power supply system 1 for shipping comprises: an AC bus 2; a first lineage power supply device 3 including a first transformer 32, a first rectification circuit 35, and a first inverter 37; and a second lineage power supply device 4 including a second transformer 42, a second rectification circuit 45, and a second inverter 47. The first transformer 32 is a delta-delta type transformer and the second transformer 42 is a delta-star type transformer; or the first transformer 32 is a star-star type transformer and the second transformer 42 is a star-delta type transformer.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] Embodiments of the present invention relate to a marine power supply system.

Background Art

[0002] Marine inverter systems are known. The marine inverter system described in FIG. 13 includes a generator 11, an AC bus 12, a three-winding transformer 13, two rectifiers 14, two inverters 15, a propulsion motor 16, and a propeller 17 driven by the propulsion motor 16.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In the marine inverter system described in FIG. 13, when the three-winding transformer 13 is connected to the AC bus 12, a large inrush current flows through the three-winding transformer 13. For this reason, a power source with sufficient capacity is required so that the voltage of the AC bus 12 does not drop too much. For example, when connecting the three-winding transformer 13 to the AC bus 12, it is necessary to operate two or more generators 11.

[0004] Also, in the marine inverter system described in FIG. 13, when the three-winding transformer 13 fails, even if the inverter 15 is healthy, the propulsion motor 16 cannot be operated.

[0005] Therefore, an object of the present invention is to provide a marine power supply system capable of suppressing the inrush current when connecting a transformer to an AC bus. Another optional object of the present invention is to provide a marine power supply system capable of continuing the operation of an electric motor using a healthy other power supply device even if one of a plurality of power supply devices fails.

Means for Solving the Problems

[0006] To solve the above problems, a ship power supply system according to an embodiment of the present invention includes an AC bus to which power is supplied from a generator on the ship, a first power supply device connected to the AC bus and supplying AC power to a first motor, and a second power supply device connected to the AC bus and supplying AC power to the first motor. The first power supply device includes a first transformer that receives AC power from the AC bus, a first rectifier circuit that converts the AC current supplied from the first transformer into a DC current, and a first inverter that converts the DC current supplied from the first rectifier circuit into an AC current and supplies it to the first motor. The second power supply device includes a second transformer that receives AC power from the AC bus, a second rectifier circuit that converts the AC current supplied from the second transformer into a DC current, and a second inverter that converts the DC current supplied from the second rectifier circuit into an AC current and supplies it to the first motor. The first transformer is a delta-delta type transformer, and the second transformer is a delta-star type transformer, or the first transformer is a star-star type transformer, and the second transformer is a star-delta type transformer.

Advantages of the Invention

[0007] According to the present invention, it is possible to provide a ship power supply system capable of suppressing the inrush current during excitation when connecting a transformer to an AC bus.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

[0009] Hereinafter, the ship power supply system 1 and the ship 100 according to the embodiments will be described with reference to the accompanying drawings. In the following description, members and parts having the same functions are denoted by the same reference numerals, and repeated descriptions of the members and parts denoted by the same reference numerals are omitted.

[0010] (First Embodiment) Referring to FIGS. 1 to 4, the marine power supply system 1A in the first embodiment will be described. FIGS. 1 and 2 are diagrams showing an example of the configuration of the marine power supply system 1A in the first embodiment. FIG. 3 is a diagram schematically showing an example of the delta connection on the primary side of the first transformer 32 or the second transformer 42. FIG. 4 is a diagram showing an example of the configuration of the marine power supply system 1A in a modified example of the first embodiment.

[0011] (Configuration and Operation) As illustrated in FIG. 1, the marine power supply system 1A includes an AC bus 2, a first system power supply device 3, and a second system power supply device 4.

[0012] Power is supplied to the AC bus 2 from the generator G on the ship. In the example shown in FIG. 1, a three-phase AC current flows through the AC bus 2.

[0013] In the example shown in FIG. 1, the marine power supply system 1A includes a first generator G1 capable of supplying power to the AC bus 2 and a second generator G2 capable of supplying power to the AC bus 2. The first generator G1 and the second generator G2 are connected in parallel to the AC bus 2. Additionally, the marine power supply system 1A may include a third generator G3 capable of supplying power to the AC bus 2. In other words, the number of generators G capable of supplying power to the AC bus 2 may be one, two, or three or more.

[0014] In the example shown in FIG. 2, the first system power supply device 3 is connected to the AC bus 2 and supplies AC power to the first motor Q1. In the example shown in FIG. 2, the first motor Q1 is a propulsion induction motor for propelling the ship. The first motor Q1 drives a first propeller P1 disposed in the water.

[0015] In the example shown in FIG. 2, the first system power supply device 3 includes a first transformer 32, a first rectifier circuit 35, and a first inverter 37.

[0016] The first transformer 32 receives AC power from the AC bus 2. Also, the first transformer 32 converts the input AC voltage on the AC bus 2 side (in other words, the primary winding side) into an output AC voltage on the first rectifier circuit 35 side (in other words, the secondary winding side). The magnitude of the output AC voltage (in other words, the output AC voltage of the first transformer 32) may be the same as or different from the magnitude of the input AC voltage of the first transformer 32. For example, the magnitude of the input AC voltage of the first transformer 32 and the magnitude of the output AC voltage of the first transformer 32 may each be 440V.

[0017] The first rectifier circuit 35 converts the AC current supplied from the first transformer 32 into a DC current. More specifically, the first rectifier circuit 35 converts the three-phase AC current supplied from the first transformer 32 into a DC current. The first rectifier circuit 35 is, for example, a three-phase full-wave rectifier circuit.

[0018] The first inverter 37 converts the DC current supplied from the first rectifier circuit 35 into an AC current and supplies it to the first motor Q1. More specifically, the first inverter 37 converts the DC current supplied from the first rectifier circuit 35 into a three-phase AC current and supplies it to the first motor Q1.

[0019] In the example described in FIG. 2, the first inverter 37 is a PWM inverter. The PWM inverter converts the input DC voltage into a desired AC voltage at a desired frequency using PWM control (that is, pulse width modulation control) and outputs it.

[0020] In the example described in FIG. 2, the second power supply device 4 of the second system is connected to the AC bus 2 and supplies AC power to the first motor Q1. The second power supply device 4 of the second system includes a second transformer 42, a second rectifier circuit 45, and a second inverter 47.

[0021] The second transformer 42 receives AC power from the AC bus 2. Also, the second transformer 42 converts the input AC voltage on the AC bus 2 side (in other words, the primary winding side) into the output AC voltage on the second rectifier circuit 45 side (in other words, the secondary winding side). The magnitude of the output AC voltage (in other words, the output AC voltage of the second transformer 42) may be the same as or different from the magnitude of the input AC voltage of the second transformer 42. For example, the magnitude of the input AC voltage of the second transformer 42 and the magnitude of the output AC voltage of the second transformer 42 may each be 440V.

[0022] The second rectifier circuit 45 converts the AC current supplied from the second transformer 42 into a DC current. More specifically, the second rectifier circuit 45 converts the three-phase AC current supplied from the second transformer 42 into a DC current. The second rectifier circuit 45 is, for example, a three-phase full-wave rectifier circuit.

[0023] The second inverter 47 converts the DC current supplied from the second rectifier circuit 45 into an AC current and supplies it to the first motor Q1. More specifically, the second inverter 47 converts the DC current supplied from the second rectifier circuit 45 into a three-phase AC current and supplies it to the first motor Q1.

[0024] During normal operation of the first motor Q1, the first motor Q1 is driven by the three-phase AC current supplied from the first inverter 37 and the three-phase AC current supplied from the second inverter 47. Also, the first motor Q1 drives the first propeller P1 disposed in water.

[0025] In the example shown in FIG. 2, the second inverter 47 is a PWM inverter. The PWM inverter converts the input DC voltage into a desired AC voltage of a desired frequency using PWM control (that is, pulse width modulation control) and outputs it.

[0026] In the example described in FIG. 2, the first transformer 32 is a delta-delta type transformer. In this specification, a delta-delta type transformer means a three-phase two-winding transformer in which the primary side (in other words, the input side) is delta-connected and the secondary side (in other words, the output side) is delta-connected.

[0027] In the example described in FIG. 1, the second transformer 42 is a delta-star type transformer. In this specification, a delta-star type transformer means a three-phase two-winding transformer in which the primary side (in other words, the input side) is delta-connected and the secondary side (in other words, the output side) is star-connected.

[0028] As illustrated in FIG. 2, during normal operation of the marine power supply system 1A, the first motor Q1 is driven using AC power supplied from both the first power supply device 3 and the second power supply device 4 of the first system.

[0029] (Effect) In the first embodiment, as illustrated in FIG. 2, power supply to the first motor Q1 is performed via a plurality of systems (the first power supply device 3 and the second power supply device 4 of the first system), and transformers (31, 41) are arranged in each system. Therefore, the capacity of each transformer can be made smaller corresponding to the capacity of one corresponding inverter, and the inrush current per transformer can be reduced.

[0030] Further, since the first transformer 32 is a delta-delta type transformer and the second transformer 42 is a delta-star type transformer, the phase difference between the output voltage of the first transformer 32 and the output voltage of the second transformer 42 becomes 30 degrees. Due to this phase difference, a part of the harmonic components generated from the first inverter 37 and a part of the harmonic components generated from the second inverter 47 cancel each other out, and voltage distortion can be suppressed.

[0031] (Optional additional configuration) Subsequently, with reference to FIGS. 1 to 4, an optional additional configuration that can be adopted in the first embodiment will be described.

[0032] (Power supply device 5 of the third system, power supply device 6 of the fourth system) In the example described in FIG. 1, the marine power supply system 1A includes a power supply device 5 of the third system and a power supply device 6 of the fourth system in addition to the power supply device 3 of the first system and the power supply device 4 of the second system.

[0033] In the example described in FIG. 2, the power supply device 5 of the third system is connected to the AC bus 2 and supplies AC power to the second motor Q2. In the example described in FIG. 2, the second motor Q2 is a propulsion induction motor for propelling the ship. The second motor Q2 drives the second propeller P2 disposed in the water.

[0034] In the example described in FIG. 2, the power supply device 5 of the third system includes a third transformer 52, a third rectifier circuit 55, and a third inverter 57.

[0035] The third transformer 52 receives AC power from the AC bus 2. Further, the third transformer 52 converts the input AC voltage on the AC bus 2 side (in other words, the primary winding side) into the output AC voltage on the third rectifier circuit 55 side (in other words, the secondary winding side). The magnitude of the output AC voltage (in other words, the output AC voltage of the third transformer 52) may be the same as or different from the magnitude of the input AC voltage of the third transformer 52. For example, the magnitude of the input AC voltage of the third transformer 52 and the magnitude of the output AC voltage of the third transformer 52 may each be 440V.

[0036] The third rectifier circuit 55 converts the AC current supplied from the third transformer 52 into a DC current. More specifically, the third rectifier circuit 55 converts the three-phase AC current supplied from the third transformer 52 into a DC current. The third rectifier circuit 55 is, for example, a three-phase full-wave rectifier circuit.

[0037] The third inverter 57 converts the DC current supplied from the third rectifier circuit 55 into an AC current and supplies it to the second motor Q2. More specifically, the third inverter 57 converts the DC current supplied from the third rectifier circuit 55 into a three-phase AC current and supplies it to the second motor Q2.

[0038] In the example described in FIG. 2, the third inverter 57 is a PWM inverter. The PWM inverter converts an input DC voltage into a desired AC voltage of a desired frequency using PWM control (i.e., pulse width modulation control) and outputs it.

[0039] In the example described in FIG. 2, the power supply device 6 of the fourth system is connected to the AC bus 2 and supplies AC power to the second motor Q2. The power supply device 6 of the fourth system includes a fourth transformer 62, a fourth rectifier circuit 65, and a fourth inverter 67.

[0040] The fourth transformer 62 receives AC power from the AC bus 2. Also, the fourth transformer 62 converts the input AC voltage on the AC bus 2 side (in other words, the primary winding side) into an output AC voltage on the fourth rectifier circuit 65 side (in other words, the secondary winding side). The magnitude of the output AC voltage (in other words, the output AC voltage of the fourth transformer 62) may be the same as or different from the magnitude of the input AC voltage of the fourth transformer 62. For example, the magnitude of the input AC voltage of the fourth transformer 62 and the magnitude of the output AC voltage of the fourth transformer 62 may each be 440V.

[0041] The fourth rectifier circuit 65 converts the AC current supplied from the fourth transformer 62 into a DC current. More specifically, the fourth rectifier circuit 65 converts the three-phase AC current supplied from the fourth transformer 62 into a DC current. The fourth rectifier circuit 65 is, for example, a three-phase full-wave rectifier circuit.

[0042] The fourth inverter 67 converts the DC current supplied from the fourth rectifier circuit 65 into an AC current and supplies it to the second motor Q2. More specifically, the fourth inverter 67 converts the DC current supplied from the fourth rectifier circuit 65 into a three-phase AC current and supplies it to the second motor Q2.

[0043] During normal operation of the second electric motor Q2, the second electric motor Q2 is driven by a three-phase alternating current supplied from the third inverter 57 and a three-phase alternating current supplied from the fourth inverter 67. Further, the second electric motor Q2 drives a second propeller P2 disposed in water.

[0044] In the example shown in FIG. 2, the fourth inverter 67 is a PWM inverter. The PWM inverter converts an input DC voltage into a desired AC voltage of a desired frequency using PWM control (i.e., pulse width modulation control) and outputs it.

[0045] In the example shown in FIG. 2, the third transformer 52 is a delta-delta type transformer, and the fourth transformer 62 is a delta-star type transformer.

[0046] As illustrated in FIG. 2, during normal operation of the marine power supply system 1A, the first electric motor Q1 is driven using AC power supplied from both the first power supply device 3 of the first system and the second power supply device 4 of the second system. Also, during normal operation of the marine power supply system 1A, the second electric motor Q2 is driven using AC power supplied from both the third power supply device 5 of the third system and the fourth power supply device 6 of the fourth system.

[0047] In the example shown in FIG. 2, it is preferable that the voltage phase of the primary winding of the first transformer 32 is configured to be in the same phase as the voltage phase of the primary winding of the second transformer 42, and the voltage phase of the primary winding of the third transformer 52 is configured to be in the same phase as the voltage phase of the primary winding of the fourth transformer 62.

[0048] In the example shown in FIG. 2, it is preferable that the voltage phase of the primary winding of the first transformer 32 is configured to be different from the voltage phase of the primary winding of the third transformer 52 by 15 degrees. Also, it is preferable that the voltage phase of the primary winding of the second transformer 42 is configured to be different from the voltage phase of the primary winding of the fourth transformer 62 by 15 degrees.

[0049] As described above, in the example shown in FIG. 2, the phase difference between the output voltage of the first transformer 32 and the output voltage of the second transformer 42 is 30 degrees (in other words, the difference between the voltage phase of the secondary winding of the first transformer 32 and the voltage phase of the secondary winding of the second transformer is 30 degrees). In this case, when the first inverter 37 and the second inverter 47 are operated simultaneously, part of the harmonics cancel each other out, and voltage distortion is suppressed. Also, since the phase difference between the voltage phases of the primary windings of each of the first transformer 32 and the second transformer 42 and the voltage phases of the primary windings of each of the third transformer 52 and the fourth transformer 62 is 15 degrees, when the first inverter 37, the second inverter 47, the third inverter 57, and the fourth inverter 67 are operated simultaneously, part of the harmonics cancel each other out, and voltage distortion is further suppressed.

[0050] Note that in order to make the phase difference between the voltage phases of the primary windings of each of the first transformer 32 and the second transformer 42 and the voltage phases of the primary windings of each of the third transformer 52 and the fourth transformer 62 15 degrees, a transformer with a phase winding may be used.

[0051] FIG. 3 shows an example of the delta connection 311 on the primary side (in other words, the input side) of the first transformer 32, and an example of the delta connection 411 on the primary side (in other words, the input side) of the second transformer 42. For the delta connection 311 (or the delta connection 411), the primary winding of the U phase includes the U-phase main winding Um and the U-phase phase winding Us, the primary winding of the V phase includes the V-phase main winding Vm and the V-phase phase winding Vs, and the primary winding of the W phase includes the W-phase main winding Wm and the W-phase phase winding Ws. By adjusting the ratio between the number of turns of the main winding (Um, Vm, Wm) of each phase and the number of turns of the phase winding (Us, Vs, Ws) of each phase, the phase difference between the voltage phase of the AC bus 2 and the voltage phase of the primary winding of the first transformer 32 (or the second transformer 42) can be set to a desired value.

[0052] In the example shown in FIG. 2, the first transformer 32 is a transformer with a phase winding that delays the voltage phase of the primary winding of the first transformer 32 by 7.5 degrees relative to the voltage phase of the AC bus 2, and the second transformer 42 is a transformer with a phase winding that delays the voltage phase of the primary winding of the second transformer 42 by 7.5 degrees relative to the voltage phase of the AC bus 2. Also, the third transformer 52 is a transformer with a phase winding that advances the voltage phase of the primary winding of the third transformer 52 by 7.5 degrees relative to the voltage phase of the AC bus 2, and the fourth transformer 62 is a transformer with a phase winding that advances the voltage phase of the primary winding of the fourth transformer 62 by 7.5 degrees relative to the voltage phase of the AC bus 2.

[0053] (First circuit breaker 31, second circuit breaker 41, first controller 71) In the example shown in FIG. 1, the marine power supply system 1A includes a first circuit breaker 31, a second circuit breaker 41, and a first controller 71.

[0054] The first circuit breaker 31 is disposed between the AC bus 2 and the first transformer 32, and opens and closes the three-phase AC current path L11 between the AC bus 2 and the first transformer 32. The first circuit breaker 31 is, for example, an air circuit breaker (in other words, a circuit breaker that interrupts current in air). In this specification, a circuit breaker means a device that can interrupt the current flowing through the current path by switching the circuit breaker from the closed state to the open state, regardless of whether a load current or a fault current is flowing through the current path where the circuit breaker is disposed.

[0055] The second circuit breaker 41 is disposed between the AC bus 2 and the second transformer 42, and opens and closes the three-phase AC current path L21 between the AC bus 2 and the second transformer 42. The second circuit breaker 41 is, for example, an air circuit breaker.

[0056] The first controller 71 controls the first circuit breaker 31 and the second circuit breaker 41. The first controller 71 may be included in the switchboard. The first controller 71 may be able to control other devices in addition to the first circuit breaker 31 and the second circuit breaker 41.

[0057] In the example described in FIG. 1, assume that the first transformer 32 and the second transformer 42 are electrically connected to the AC bus 2. The first controller 71 controls the first circuit breaker 31 and the second circuit breaker 41 so that the electrical connection between the AC bus 2 and the first transformer 32 and the electrical connection between the AC bus 2 and the second transformer 42 are made at different times with a time interval therebetween. The time interval between the timing when the first controller 71 switches one of the first circuit breaker 31 and the second circuit breaker 41 from the open state to the closed state and the timing when the first controller 71 switches the other of the first circuit breaker 31 and the second circuit breaker 41 from the open state to the closed state is, for example, 5 seconds or more.

[0058] By making the electrical connection of the first transformer 32 to the AC bus 2 and the electrical connection of the second transformer 42 to the AC bus 2 at different times with a time interval therebetween, the inrush current can be leveled, and the voltage drop of the AC bus 2 can be suppressed. Note that the connection of the first transformer 32 to the AC bus 2 and the connection of the second transformer 42 to the AC bus 2 are made, for example, in a state where at least one generator G supplies power to the AC bus 2.

[0059] (Third circuit breaker 51, fourth circuit breaker 61, second controller 72) In the example described in FIG. 1, the marine power supply system 1A includes a third circuit breaker 51, a fourth circuit breaker 61, and a second controller 72.

[0060] The third circuit breaker 51 is disposed between the AC bus 2 and the third transformer 52 and opens and closes the three-phase AC current path L31 between the AC bus 2 and the third transformer 52. The fourth circuit breaker 61 is disposed between the AC bus 2 and the fourth transformer 62 and opens and closes the three-phase AC current path L41 between the AC bus 2 and the fourth transformer 62. Each of the third circuit breaker 51 and the fourth circuit breaker 61 is, for example, an air circuit breaker.

[0061] The second controller 72 controls the third circuit breaker 51 and the fourth circuit breaker 61. The second controller 72 may be included in the switchboard.

[0062] The second controller 72 controls the third circuit breaker 51 and the fourth circuit breaker 61 so that the electrical connection between the AC bus 2 and the third transformer 52 and the electrical connection between the AC bus 2 and the fourth transformer 62 are made at different times with a time interval therebetween. Note that the connection of the third transformer 52 to the AC bus 2 and the connection of the fourth transformer 62 to the AC bus 2 are made, for example, in a state where at least one generator G is supplying power to the AC bus 2.

[0063] The first controller 71 and the second controller 72 are preferably configured to sequentially make all of the electrical connection of the first transformer 32 to the AC bus 2, the electrical connection of the second transformer 42 to the AC bus 2, the electrical connection of the third transformer 52 to the AC bus 2, and the electrical connection of the fourth transformer 62 to the AC bus 2 with a time interval therebetween. By making the electrical connections of the plurality of transformers (31, 41, 51, 61) to the AC bus 2 one by one at different timings, the inrush current can be leveled and the voltage drop of the AC bus 2 can be suppressed. Note that the electrical connections of the plurality of transformers (31, 41, 51, 61) to the AC bus 2 are made, for example, in a state where at least one generator G is supplying power to the AC bus 2.

[0064] (Modification of the First Embodiment) In the example shown in FIG. 1, the first transformer 32 is a delta-delta type transformer and the second transformer 42 is a delta-star type transformer. Alternatively, as illustrated in FIG. 4, the first transformer 32 may be a star-star type transformer and the second transformer 42 may be a star-delta type transformer. In other words, in the example shown in FIG. 1, the first transformer 32 may be replaced from a delta-delta type transformer with a star-star type transformer, and the second transformer 42 may be replaced from a delta-star type transformer with a star-delta type transformer. Note that in this specification, the star-star type transformer means a three-phase two-winding transformer having a star connection on the primary side (in other words, the input side) and a star connection on the secondary side (in other words, the output side). Also, in this specification, the star-delta type transformer means a three-phase two-winding transformer having a star connection on the primary side (in other words, the input side) and a delta connection on the secondary side (in other words, the output side).

[0065] In the example described in FIG. 1, the third transformer 52 is a delta-delta type transformer, and the fourth transformer 62 is a delta-star type transformer. Alternatively, as illustrated in FIG. 4, the third transformer 52 may be a star-star type transformer, and the fourth transformer 62 may be a star-delta type transformer. In other words, in the example described in FIG. 1, the third transformer 52 may be replaced from a delta-delta type transformer to a star-star type transformer, and the fourth transformer 62 may be replaced from a delta-star type transformer to a star-delta type transformer.

[0066] Also in the example described in FIG. 4, the voltage phase of the primary winding of the first transformer 32 is configured to be in the same phase as the voltage phase of the primary winding of the second transformer 42, the voltage phase of the primary winding of the third transformer 52 is configured to be in the same phase as the voltage phase of the primary winding of the fourth transformer 62, and it is preferable that the voltage phase of the primary winding of the first transformer 32 is configured to be different by 15 degrees from the voltage phase of the primary winding of the third transformer 52.

[0067] Furthermore, alternatively, as the power supply device 3 of the first system and the power supply device 4 of the second system, the configuration shown in FIG. 1 (for example, the configuration in which the first transformer 32 is a delta-delta type transformer and the second transformer 42 is a delta-star type transformer) may be adopted, and as the power supply device 5 of the third system and the power supply device 6 of the fourth system, the configuration shown in FIG. 4 (for example, the configuration in which the third transformer 52 is a star-star type transformer and the fourth transformer 62 is a star-delta type transformer) may be adopted.

[0068] (Second Embodiment) Referring to FIGS. 5 to 11, the ship power supply system 1B in the second embodiment will be described. FIGS. 5 to 8 and FIG. 10 are diagrams showing an example of the configuration of the ship power supply system 1B in the second embodiment. FIG. 9 is a diagram schematically showing how the length of the winding of the first motor Q1 handled by the first inverter 37 changes as the control mode is switched from the first control mode M1 to the second control mode M2. FIG. 11 is a diagram showing an example of the configuration of the ship power supply system 1B in a modified example of the second embodiment.

[0069] (Configuration and Operation) The ship power supply system 1B in the second embodiment is different from the ship power supply system 1A in the first embodiment in that it includes a first switch 81, a second switch 82, a third switch 83, and a first control device 76 that controls these switches.

[0070] In the second embodiment, the description will focus on the differences from the first embodiment, and repetitive descriptions of matters already explained in the first embodiment will be omitted. Therefore, even if not explicitly described in the second embodiment, it goes without saying that matters already explained in the first embodiment can be adopted in the second embodiment.

[0071] As illustrated in FIG. 5, the ship power supply system 1B in the second embodiment includes an AC bus 2, a first power supply device 3 of a first system, and a second power supply device 4 of a second system. Additionally, the ship power supply system 1B in the second embodiment may include a first circuit breaker 31, a second circuit breaker 41, and a first controller 71. Since the AC bus 2, the first power supply device 3 of the first system, the second power supply device 4 of the second system, the first circuit breaker 31, the second circuit breaker 41, and the first controller 71 have already been described in the first embodiment, repetitive descriptions of these configurations will be omitted.

[0072] Additionally, the marine power supply system 1B in the second embodiment may include a third power supply device 5 and a second power supply device 6. Further, the marine power supply system 1B in the second embodiment may include a third circuit breaker 51, a fourth circuit breaker 61, and a second controller 72. Since the third power supply device 5, the fourth power supply device 6, the third circuit breaker 51, the fourth circuit breaker 61, and the second controller 72 have been described in the first embodiment, repeated descriptions of these configurations are omitted.

[0073] Additionally, the marine power supply system 1B in the second embodiment may include at least one generator (for example, the first generator G1, the second generator G2, the third generator G3, etc.), at least one motor (for example, the first motor Q1, the second motor Q2, etc.), and at least one propeller (for example, the first propeller P1, the second propeller P2, etc.). Since the first generator G1, the second generator G2, the third generator G3, the first motor Q1, the second motor Q2, the first propeller P1, and the second propeller P2 have been described in the first embodiment, repeated descriptions of these configurations are omitted.

[0074] In the example shown in FIG. 5, the marine power supply system 1B includes a first switch 81, a second switch 82, a third switch 83, and a first control device 76.

[0075] The first switch 81 opens and closes a first alternating current path L13 (more specifically, a first three-phase alternating current path) that connects the first inverter 37 and the first motor Q1. The first switch 81 is, for example, a contactor (in other words, an electromagnetic contactor that operates by electromagnetic force).

[0076] The second switch 82 opens and closes a second alternating current path L23 (more specifically, a second three-phase alternating current path) that connects the second inverter 47 and the first motor Q1. The second switch 82 is, for example, a contactor (in other words, an electromagnetic contactor that operates by electromagnetic force).

[0077] The third switch 83 opens and closes a third AC current path L5 (more specifically, a third three-phase AC current path) that connects the first AC current path L13 and the second AC current path L23. The third switch 83 is, for example, a contactor (in other words, an electromagnetic contactor that operates by electromagnetic force). In the example shown in FIG. 5, one end of the third AC current path L5 is connected to the first AC current path L13 between the first switch 81 and the first motor Q1, and the other end of the third AC current path L5 is connected to the second AC current path L23 between the second switch 82 and the first motor Q1.

[0078] The first control device 76 controls the first switch 81, the second switch 82, and the third switch 83. The first control device 76 may be able to control other devices in addition to the first switch 81, the second switch 82, and the third switch 83.

[0079] As illustrated in FIG. 6, the first control device 76 is capable of executing a first control mode M1 in which the first switch 81 is in a closed state, the second switch 82 is in a closed state, and the third switch 83 is in an open state. In the example shown in FIG. 6, when the first control mode M1 is executed, the first motor Q1 is configured to be driven using AC power supplied from both the first power supply device 3 and the second power supply device 4 of the first system. Also, the first propeller P1 is configured to be driven by the first motor Q1.

[0080] As illustrated in FIG. 7, the first control device 76 is capable of executing a second control mode M2 in which the first switch 81 is in a closed state, the second switch 82 is in an open state, and the third switch 83 is in a closed state. In the example shown in FIG. 7, when the second control mode M2 is executed, the second power supply device 4 of the second system is disconnected from the first motor Q1, and the first motor Q1 is configured to be driven using AC power supplied from the first power supply device 3 of the first system. Also, the first propeller P1 is configured to be driven by the first motor Q1.

[0081] As illustrated in FIG. 8, the first control device 76 is capable of executing a third control mode M3 in which the first switch 81 is in an open state, the second switch 82 is in a closed state, and the third switch 83 is in a closed state. In the example described in FIG. 8, when the third control mode M3 is executed, the power supply device 3 of the first system is disconnected from the first motor Q1, and the first motor Q1 is configured to be driven using AC power supplied from the power supply device 4 of the second system. Further, the first propeller P1 is configured to be driven by the first motor Q1.

[0082] (Effect) The second embodiment has the same effects as the first embodiment. Further, in the second embodiment, the first control device 76 can selectively execute the first control mode M1, the second control mode M2, and the third control mode M3. Therefore, even if one of the power supply devices 3 of the first system (for example, the first circuit breaker 31, the first transformer 32, the first rectifier circuit 35, the first inverter 37, etc.) and the power supply device 4 of the second system (for example, the second circuit breaker 41, the second transformer 42, the second rectifier circuit 45, the second inverter 47, etc.) fails, the operation of the first motor Q1 can be continued using the healthy other power supply device.

[0083] (Optional additional configuration) Subsequently, with reference to FIGS. 5 to 11, an optional additional configuration that can be adopted in the second embodiment will be described.

[0084] (First communication circuit 85, second communication circuit 89) In the example described in FIG. 5, the marine power supply system 1B includes a first communication circuit 85 (more specifically, a first optical communication circuit) and / or a second communication circuit 89 (more specifically, a second optical communication circuit).

[0085] The first communication circuit 85 transmits a signal S1 for causing the slave-side inverter, which is the other one of the first inverter 37 and the second inverter 47, to follow and synchronize with the master-side inverter, which is one of the first inverter 37 and the second inverter 47, from the master-side inverter to the slave-side inverter (see FIG. 6). The slave-side inverter that receives the signal S1 adjusts the phase of the AC output voltage of the slave-side inverter so as to synchronize with the phase of the AC output voltage of the master-side inverter. By synchronizing the phase of the AC output voltage of the master-side inverter and the phase of the AC output voltage of the slave-side inverter, the operating efficiency of the first motor Q1 is improved. In the example shown in FIG. 6, the second inverter 47 is the master-side inverter and the first inverter 37 is the slave-side inverter. Alternatively, the first inverter 37 may be the master-side inverter and the second inverter 47 may be the slave-side inverter.

[0086] The second communication circuit 89 transmits a signal S2 for causing the slave-side inverter, which is the other one of the third inverter 57 and the fourth inverter 67, to follow and synchronize with the master-side inverter, which is one of the third inverter 57 and the fourth inverter 67, from the master-side inverter to the slave-side inverter (see FIG. 6). The slave-side inverter that receives the signal S2 adjusts the phase of the AC output voltage of the slave-side inverter so as to synchronize with the phase of the AC output voltage of the master-side inverter. By synchronizing the phase of the AC output voltage of the master-side inverter and the phase of the AC output voltage of the slave-side inverter, the operating efficiency of the second motor Q2 is improved. In the example shown in FIG. 6, the fourth inverter 67 is the master-side inverter and the third inverter 57 is the slave-side inverter. Alternatively, the third inverter 57 may be the master-side inverter and the fourth inverter 67 may be the slave-side inverter.

[0087] Note that the configurations of the first communication circuit 85 and the second communication circuit 89 can also be adopted in the first embodiment.

[0088] (Fourth switch 86, fifth switch 87, sixth switch 88, second control device 77) In the example described in FIG. 5, the marine power supply system 1B includes a fourth switch 86, a fifth switch 87, a sixth switch 88, and a second control device 77.

[0089] The fourth switch 86 opens and closes a fourth alternating current path L33 (more specifically, a fourth three-phase alternating current path) that connects the third inverter 57 and the second electric motor Q2. The fourth switch 86 is, for example, a contactor (in other words, an electromagnetic contactor that operates by electromagnetic force).

[0090] The fifth switch 87 opens and closes a fifth alternating current path L43 (more specifically, a fifth three-phase alternating current path) that connects the fourth inverter 67 and the second electric motor Q2. The fifth switch 87 is, for example, a contactor (in other words, an electromagnetic contactor that operates by electromagnetic force).

[0091] The sixth switch 88 opens and closes a sixth alternating current path L6 (more specifically, a sixth three-phase alternating current path) that connects the fourth alternating current path L33 and the fifth alternating current path L43. The sixth switch 88 is, for example, a contactor (in other words, an electromagnetic contactor that operates by electromagnetic force). In the example described in FIG. 5, one end of the sixth alternating current path L6 is connected to the fourth alternating current path L33 between the fourth switch 86 and the second electric motor Q2, and the other end of the sixth alternating current path L6 is connected to the fifth alternating current path L43 between the fifth switch 87 and the second electric motor Q2.

[0092] The second control device 77 controls the fourth switch 86, the fifth switch 87, and the sixth switch 88. In addition to the fourth switch 86, the fifth switch 87, and the sixth switch 88, the second control device 77 may be able to control other devices. The second control device 77 can selectively execute a fourth control mode M4, a fifth control mode, and a sixth control mode, which will be described later.

[0093] The second control device 77 is capable of executing a fourth control mode M4 in which the fourth switch 86 is in the closed state, the fifth switch 87 is in the closed state, and the sixth switch 88 is in the open state. In the example shown in FIG. 6, when the fourth control mode M4 is executed, the second motor Q2 is configured to be driven using AC power supplied from both the power supply device 5 of the third system and the power supply device 6 of the fourth system. Further, the second propeller P2 is configured to be driven by the second motor Q2.

[0094] The second control device 77 is capable of executing a fifth control mode in which the fourth switch 86 is in the closed state, the fifth switch 87 is in the open state, and the sixth switch 88 is in the closed state. When the fifth control mode is executed, the power supply device 6 of the fourth system is disconnected from the second motor Q2, and the second motor Q2 is configured to be driven using AC power supplied from the power supply device 5 of the third system. Further, the second propeller P2 is configured to be driven by the second motor Q2.

[0095] The second control device 77 is capable of executing a sixth control mode in which the fourth switch 86 is in the open state, the fifth switch 87 is in the closed state, and the sixth switch 88 is in the closed state. When the sixth control mode is executed, the power supply device 5 of the third system is disconnected from the second motor Q2, and the second motor Q2 is configured to be driven using AC power supplied from the power supply device 6 of the fourth system. Further, the second propeller P2 is configured to be driven by the second motor Q2.

[0096] (Seventh switch 34, eighth switch 44, ninth switch 54, tenth switch 64) As illustrated in FIG. 5, the power supply device 3 of the first system may have a seventh switch 34 that opens and closes a seventh AC current path L7 connecting the first transformer 32 and the first rectifier circuit 35. The seventh switch 34 is, for example, a contactor. The seventh switch 34 is opened and closed by a signal from the first control device 76. Alternatively, or additionally, the power supply device 3 of the first system may have a fifth circuit breaker 33 (for example, an air circuit breaker) that opens and closes the seventh AC current path L7. The fifth circuit breaker 33 is opened and closed by a signal from the first controller 71 or the first control device 76.

[0097] As illustrated in FIG. 5, the power supply device 4 of the second system may have an eighth switch 44 that opens and closes an eighth AC current path L8 connecting the second transformer 42 and the second rectifier circuit 45. The eighth switch 44 is, for example, a contactor. The eighth switch 44 is opened and closed by a signal from the first control device 76. Alternatively, or additionally, the power supply device 4 of the second system may have a sixth circuit breaker 43 (for example, an air circuit breaker) that opens and closes the eighth AC current path L8. The sixth circuit breaker 43 is opened and closed by a signal from the first controller 71 or the first control device 76.

[0098] As illustrated in FIG. 5, the power supply device 5 of the third system may have a ninth switch 54 that opens and closes a ninth AC current path L9 connecting the third transformer 52 and the third rectifier circuit 55. The ninth switch 54 is, for example, a contactor. The ninth switch 54 is opened and closed by a signal from the second control device 77. Alternatively, or additionally, the power supply device 5 of the third system may have a seventh circuit breaker 53 (for example, an air circuit breaker) that opens and closes the ninth AC current path L9. The seventh circuit breaker 53 is opened and closed by a signal from the second controller 72 or the second control device 77.

[0099] As illustrated in FIG. 5, the power supply device 5 of the fourth system may have a tenth switch 64 that opens and closes a tenth AC current path L10 connecting the fourth transformer 62 and the fourth rectifier circuit 65. The tenth switch 64 is, for example, a contactor. The tenth switch 64 is opened and closed by a signal from the second control device 77. Alternatively, or additionally, the power supply device 6 of the fourth system may have an eighth circuit breaker 63 (for example, an air circuit breaker) that opens and closes the tenth AC current path L10. The eighth circuit breaker 63 is opened and closed by a signal from the second controller 72 or the second control device 77.

[0100] Note that the configurations of the seventh switch 34, the eighth switch 44, the ninth switch 54, and the tenth switch 64 can also be adopted in the first embodiment. Also, the configurations of the fifth circuit breaker 33, the sixth circuit breaker 43, the seventh circuit breaker 53, and the eighth circuit breaker 63 can also be adopted in the first embodiment.

[0101] (Change from the first control mode M1 to the second control mode M2) In the examples shown in FIGS. 6 and 7, when the first control device 76 changes the control mode from the first control mode M1 to the second control mode M2, it is configured to automatically change the motor constant, which is an internal parameter of the first inverter 37. Also, when the second control mode M2 is executed, the first inverter 37 is configured to operate based on the internal parameters including the automatically changed motor constant and the signals received from outside the first inverter 37. Note that the motor constant means a constant unique to the motor (for example, a constant indicating the electrical resistance of the motor, a constant indicating the reactance of the motor, a constant indicating the time constant of the motor). Also, the signals received by the first inverter 37 from outside the first inverter 37 include, for example, an inverter operation / stop command, a signal indicating the torque command value of the first motor Q1, a signal indicating the rotor speed command value of the first motor Q1, and the like.

[0102] When the first control mode M1 is executed, the first inverter 37 is configured to operate based on internal parameters including the motor constants before automatic change and signals received from outside the first inverter 37 described above (more specifically, based on internal parameters including the motor constants before automatic change and signals received from outside the first inverter 37 described above, it is configured to chop the DC voltage input to the first inverter 37). Also, when the second control mode M2 is executed, the first inverter 37 is configured to operate based on internal parameters including the motor constants after automatic change and signals received from outside the first inverter 37 described above (more specifically, based on internal parameters including the motor constants after automatic change and signals received from outside the first inverter 37 described above, it is configured to chop the DC voltage input to the first inverter 37).

[0103] During normal operation when the first control mode M1 is executed (see FIG. 6), and when the second control mode M2 is executed (see FIG. 7), since the length of the winding of the first motor Q1 handled by one inverter (more specifically, the first inverter 37) changes, the motor constants (electrical resistance, reactance, time constant) of the first motor Q1 handled by one inverter also change. FIG. 9 schematically shows how the length of the winding of the first motor Q1 handled by the first inverter 37 changes in response to the control mode being switched from the first control mode M1 to the second control mode M2.

[0104] In the above example, when the control mode is changed from the first control mode M1 to the second control mode M2, the motor constants (for example, the constant indicating the electrical resistance of the first motor Q1, the constant indicating the reactance of the first motor Q1, and / or the constant indicating the time constant of the first motor Q1), which are the internal parameters of the first inverter 37, are automatically changed. Therefore, the first motor Q1 can be operated with high efficiency when each of the first control mode M1 and the second control mode M2 is executed.

[0105] In the examples described in FIGS. 6 and 7, when the first control device 76 changes the control mode from the first control mode M1 to the second control mode M2, the follow-up synchronization control using the first communication circuit 85 is configured to be switched from the enabled state to the disabled state. For example, when the first control device 76 changes the control mode from the first control mode M1 to the second control mode M2, a parameter that specifies the presence or absence of communication using the first communication circuit 85, which is one of the internal parameters of the first inverter 37, is changed from "present" to "absent". In this way, the release of the follow-up synchronization control is smoothly performed.

[0106] (Change from the first control mode M1 to the third control mode M3) In the examples described in FIGS. 6 and 8, when the first control device 76 changes the control mode from the first control mode M1 to the third control mode M3, the first control device 76 is configured to automatically change the motor constant, which is an internal parameter of the second inverter 47. Further, when the third control mode M3 is executed, the second inverter 47 is configured to operate based on the internal parameters including the automatically changed motor constant and a signal received from outside the second inverter 47. Note that the signal received by the second inverter 47 from outside the second inverter 47 includes, for example, an operation / stop command for the inverter, a signal indicating the torque command value of the first motor Q1, a signal indicating the rotor rotation speed command value of the first motor Q1, and the like.

[0107] When the first control mode M1 is executed, the second inverter 47 is configured to operate based on internal parameters including the motor constants before automatic change and signals received from outside the second inverter 47 described above (more specifically, based on internal parameters including the motor constants before automatic change and signals received from outside the second inverter 47 described above, it is configured to chop the DC voltage input to the second inverter 47). Also, when the third control mode M3 is executed, the second inverter 47 is configured to operate based on internal parameters including the motor constants after automatic change and signals received from outside the second inverter 47 described above (more specifically, based on internal parameters including the motor constants after automatic change and signals received from outside the second inverter 47 described above, it is configured to chop the DC voltage input to the second inverter 47).

[0108] During normal operation when the first control mode M1 is executed (see FIG. 6), and when the third control mode M3 is executed (see FIG. 8), since the length of the winding of the first motor Q1 handled by one inverter (more specifically, the second inverter 47) changes, the motor constants (electrical resistance, reactance, time constant) of the first motor Q1 handled by one inverter also change. In the example described above, when the control mode is changed from the first control mode M1 to the third control mode M3, the motor constants which are internal parameters of the second inverter 47 (for example, the constant indicating the electrical resistance of the first motor Q1, the constant indicating the reactance of the first motor Q1, and / or the constant indicating the time constant of the first motor Q1) are automatically changed. For this reason, during the execution of each of the first control mode M1 and the third control mode M3, the first motor Q1 can be operated with high efficiency.

[0109] In the examples shown in FIGS. 6 and 8, the first control device 76 is configured to switch the follow-up synchronization control using the first communication circuit 85 from the effective state to the ineffective state when changing the control mode from the first control mode M1 to the third control mode M3.

[0110] (Change from the fourth control mode M4 to the fifth control mode) The change from the fourth control mode M4 to the fifth control mode is the same as the change from the first control mode M1 to the second control mode M2. Therefore, in the above description of "(the change from the first control mode M1 to the second control mode M2)", by replacing the terms "the first control mode M1", "the second control mode M2", "the first control device 76", "the first inverter 37", "the first motor Q1", and "the first communication circuit 85" with "the fourth control mode M4", "the fifth control mode", "the second control device 77", "the third inverter 57", "the second motor Q2", and "the second communication circuit 89" respectively, it is regarded as the description of "(the change from the fourth control mode M4 to the fifth control mode)", and the repeated description of "the change from the fourth control mode M4 to the fifth control mode" is omitted.

[0111] (Change from the fourth control mode M4 to the sixth control mode) The change from the fourth control mode M4 to the sixth control mode is the same as the change from the first control mode M1 to the third control mode M3. Therefore, in the above description of "(the change from the first control mode M1 to the third control mode M3)", by replacing the terms "the first control mode M1", "the third control mode M3", "the first control device 76", "the second inverter 47", "the first motor Q1", and "the first communication circuit 85" with "the fourth control mode M4", "the sixth control mode", "the second control device 77", "the fourth inverter 67", "the second motor Q2", and "the second communication circuit 89" respectively, it is regarded as the description of "(the change from the fourth control mode M4 to the sixth control mode)", and the repeated description of "the change from the fourth control mode M4 to the sixth control mode" is omitted.

[0112] (Flow from detection of failure to change of control mode) In the example described in FIG. 5, the marine power supply system 1B includes a failure detection device 91 capable of detecting each of the failure of the power supply device 3 of the first system and the failure of the power supply device 4 of the second system. At least a part of the failure detection device 91 may be constituted by the first controller 71. Alternatively, or additionally, at least a part of the failure detection device 91 may be constituted by the first control device 76.

[0113] When the failure detection device 91 detects a failure of the first system power supply device 3 during the execution of the first control mode M1 (see Fig. 6), the first control device 76 switches the first switch 81 from the closed state to the open state and switches the second switch 82 from the closed state to the open state (see Fig. 10). Additionally, when the failure detection device 91 detects a failure of the first system power supply device 3 during the execution of the first control mode M1, the first control device 76 may switch the seventh switch 34 from the closed state to the open state and switch the eighth switch 44 from the closed state to the open state (see Fig. 10).

[0114] After the second switch 82 is switched to the open state, the first control device 76 automatically changes the internal parameters of the second inverter 47 to parameters for half output. More specifically, after the second switch 82 is switched to the open state, the first control device 76 automatically changes the motor constants (for example, the constant indicating the electrical resistance of the first motor Q1, the constant indicating the reactance of the first motor Q1, the constant indicating the time constant of the first motor Q1), which are the internal parameters of the second inverter 47. Additionally, after the second switch 82 is switched to the open state, the upper limit value of the torque current command, which is one of the upper limit setting parameters of the second inverter 47, may be automatically changed to a halved value.

[0115] At an arbitrary timing after the first switch 81 and the second switch 82 are switched to the open state, the first control device 76 switches the third switch 83 from the open state to the closed state. Also, after the motor constants, which are the internal parameters of the second inverter 47, are automatically changed, the first control device 76 switches the second switch 82 from the open state to the closed state to execute the third control mode M3 (see Fig. 8). Additionally, after the motor constants, which are the internal parameters of the second inverter 47, are automatically changed, the first control device 76 may be configured to switch the eighth switch 44 from the open state to the closed state.

[0116] When the failure detection device 91 detects a failure of the second system power supply device 4 during the execution of the first control mode M1, the first control device 76 switches the first switch 81 from the closed state to the open state and switches the second switch 82 from the closed state to the open state (see FIG. 10). Additionally, when the failure detection device 91 detects a failure of the second system power supply device 4 during the execution of the first control mode M1, the first control device 76 may switch the seventh switch 34 from the closed state to the open state and switch the eighth switch 44 from the closed state to the open state (see FIG. 10).

[0117] After the first switch 81 is switched to the open state, the first control device 76 automatically changes the internal parameters of the first inverter 37 to parameters for half output. More specifically, after the first switch 81 is switched to the open state, the first control device 76 automatically changes the motor constants (for example, the constant indicating the electrical resistance of the first motor Q1, the constant indicating the reactance of the first motor Q1, the constant indicating the time constant of the first motor Q1), which are the internal parameters of the first inverter 37. Additionally, after the first switch 81 is switched to the open state, the upper limit value of the torque current command, which is one of the upper limit setting parameters of the first inverter 37, may be automatically changed to a halved value.

[0118] At an arbitrary timing after the first switch 81 and the second switch 82 are switched to the open state, the first control device 76 switches the third switch 83 from the open state to the closed state. Also, after the motor constants, which are the internal parameters of the first inverter 37, are automatically changed, the first control device 76 switches the first switch 81 from the open state to the closed state and executes the second control mode M2 (see FIG. 7). Additionally, after the motor constants, which are the internal parameters of the first inverter 37, are automatically changed, the first control device 76 may be configured to switch the seventh switch 34 from the open state to the closed state.

[0119] In the example described in FIG. 5, the marine power supply system 1B includes a second fault detection device 92 capable of detecting each of a fault in the power supply device 5 of the third system and a fault in the power supply device 6 of the fourth system. At least a part of the second fault detection device 92 may be constituted by the second controller 72. Alternatively, or additionally, at least a part of the second fault detection device 92 may be constituted by the second control device 77.

[0120] The flow from when a fault is detected by the second fault detection device 92 until the control mode is changed is the same as the flow from when a fault is detected by the fault detection device 91 until the control mode is changed. Therefore, in the above description of "(the flow from fault detection to control mode change)", the terms "first control mode M1", "fault detection device 91", "power supply device 3 of the first system", "first switch 81", "second switch 82", "seventh switch 34", "eighth switch 44", "first control device 76", "second inverter 47", "first motor Q1", "third switch 83", "third control mode M3", "power supply device 4 of the second system", "first inverter 37", "second control mode M2" are respectively replaced with the terms "fourth control mode M4", "second fault detection device 92", "power supply device 5 of the third system", "fourth switch 86", "fifth switch 87", "ninth switch 54", "tenth switch 64", "second control device 77", "fourth inverter 67", "second motor Q2", "sixth switch 88", "sixth control mode", "power supply device 6 of the fourth system", "third inverter 57", "fifth control mode". By doing so, it is regarded as an explanation of "the flow from when a fault is detected by the second fault detection device 92 until the control mode is changed", and the repetitive explanation about the flow is omitted.

[0121] (Modification of the Second Embodiment) In the example described in FIG. 5, the first transformer 32 is a delta-delta type transformer, and the second transformer 42 is a delta-star type transformer. Alternatively, as illustrated in FIG. 11, the first transformer 32 may be a star-star type transformer, and the second transformer 42 may be a star-delta type transformer.

[0122] In the example described in FIG. 5, the third transformer 52 is a delta-delta type transformer, and the fourth transformer 62 is a delta-star type transformer. Alternatively, as illustrated in FIG. 11, the third transformer 52 may be a star-star type transformer, and the fourth transformer 62 may be a star-delta type transformer.

[0123] In any of the examples described in FIGS. 5 and 11, the voltage phase of the primary winding of the first transformer 32 is configured to be in the same phase as the voltage phase of the primary winding of the second transformer 42, and the voltage phase of the primary winding of the third transformer 52 is configured to be in the same phase as the voltage phase of the primary winding of the fourth transformer 62, and preferably, the voltage phase of the primary winding of the first transformer 32 is configured to be different from the voltage phase of the primary winding of the third transformer 52 by 15 degrees.

[0124] Further alternatively, as the power supply device 3 of the first system and the power supply device 4 of the second system, the configuration shown in FIG. 5 (for example, the configuration in which the first transformer 32 is a delta-delta type transformer and the second transformer 42 is a delta-star type transformer) may be adopted, and as the power supply device 5 of the third system and the power supply device 6 of the fourth system, the configuration shown in FIG. 11 (for example, the configuration in which the third transformer 52 is a star-star type transformer and the fourth transformer 62 is a star-delta type transformer) may be adopted.

[0125] (Third Embodiment) With reference to FIGS. 1 to 12, the ship 100 in the third embodiment will be described. FIG. 12 is a schematic two-view showing an example of the ship 100 in the third embodiment. A schematic side view is shown on the upper side of FIG. 12, and a schematic bottom view is shown on the lower side of FIG. 12.

[0126] (Configuration and Operation) As illustrated in FIG. 12, the ship 100 in the third embodiment includes a hull 105. The hull 105 is equipped with the ship power supply system 1A in the first embodiment (see FIGS. 1 to 4), or the ship power supply system 1B in the second embodiment (see FIGS. 5 to 11).

[0127] In the example described in FIG. 12, a first propeller P1 and a second propeller P2 are arranged at the stern portion of the hull 105.

[0128] (Effect) Since the ship 100 in the third embodiment is equipped with the ship power supply system 1A in the first embodiment or the ship power supply system 1B in the second embodiment, the third embodiment exhibits the same effects as the first embodiment or the second embodiment.

[0129] The present invention is not limited to the above-described embodiments or each modification example, and it is obvious that each embodiment or each modification example can be appropriately deformed or changed within the scope of the technical idea of the present invention. Also, various techniques used in each embodiment or each modification example are applicable to other embodiments or other modification examples as long as no technical contradiction occurs. Furthermore, any additional configuration in each embodiment or each modification example can be appropriately omitted.

Description of Reference Numerals

[0130] 1, 1A, 1B... Marine power supply system, 2... AC bus, 3... Power supply device of the first system, 4... Power supply device of the second system, 5... Power supply device of the third system, 6... Power supply device of the fourth system, 11... Generator, 12... AC bus, 14... Rectifier, 15... Inverter, 16... Propulsion motor, 17... Propeller, 31... First circuit breaker, 32... First transformer, 33... Fifth circuit breaker, 34... Seventh switch, 35... First rectifier circuit, 37... First inverter, 41... Second circuit breaker, 42... Second transformer, 43... Sixth circuit breaker, 44... Eighth switch, 45... Second rectifier circuit, 47... Second inverter, 51... Third circuit breaker, 52... Third transformer, 53... Seventh circuit breaker, 54... Ninth switch, 55... Third rectifier circuit, 57... Third inverter, 61... Fourth circuit breaker, 62... Fourth transformer, 63... Eighth circuit breaker, 64... Tenth switch, 65... Fourth rectifier circuit, 67... Fourth inverter, 71... First controller, 72... Second controller, 76... First control device, 77... Second control device, 81... First switch, 82... Second switch, 83... Third switch, 85... First communication circuit, 86... Fourth switch, 87... Fifth switch, 88... Sixth switch, 89... Second communication circuit, 91... Fault detection device, 92... Second fault detection device, 100... Ship, 105... Hull, 311... Delta connection, 411... Delta connection, G... Generator, G1... First generator, G2... Second generator, G3... Third generator, L13... First AC current path, L23... Second AC current path, L5... Third AC current path, L33... Fourth AC current path, L43... Fifth AC current path, L6... Sixth AC current path, L7... Seventh AC current path, L8... Eighth AC current path, L9... Ninth AC current path, L10... Tenth AC current path, M1... First control mode, M2... Second control mode, M3... Third control mode, M4... Fourth control mode, P1... First propeller, P2... Second propeller, Q1... First motor, Q2... Second motor, S1, S2... Signals, Um... U-phase main winding, Us... U-phase phase winding, Vm... V-phase main winding, Vs... V-phase phase winding, Wm... W-phase main winding, Ws... W-phase phase winding

Claims

1. An AC busbar supplied with power from a generator inside a ship, a first power supply device connected to the AC busbar and supplying AC power to a first motor, a second power supply device connected to the AC busbar and supplying AC power to the first motor and comprising: The first power supply device a first transformer receiving AC power from the AC busbar, a first rectifier circuit converting the AC current supplied from the first transformer into a DC current, a first inverter converting the DC current supplied from the first rectifier circuit into an AC current and supplying it to the first motor and having; The second power supply device a second transformer receiving AC power from the AC busbar, a second rectifier circuit converting the AC current supplied from the second transformer into a DC current, a second inverter converting the DC current supplied from the second rectifier circuit into an AC current and supplying it to the first motor and having; The first transformer is a delta-delta type transformer, and the second transformer is a delta-star type transformer, or The first transformer is a star-star type transformer, and the second transformer is a star-delta type transformer A marine power supply system.

2. a first circuit breaker disposed between the AC busbar and the first transformer, a second circuit breaker disposed between the AC busbar and the second transformer, a first controller controlling the first circuit breaker and the second circuit breaker and comprising: The first controller controls the first circuit breaker and the second circuit breaker so that the electrical connection between the AC busbar and the first transformer and the electrical connection between the AC busbar and the second transformer are made at non-simultaneous time intervals. The marine power supply system according to Claim 1.

3. a third power supply device connected to the AC busbar and supplying AC power to a second motor, a fourth power supply device connected to the AC busbar and supplying AC power to the second motor and further comprising: The third power supply device a third transformer receiving AC power from the AC busbar, a third rectifier circuit converting the AC current supplied from the third transformer into a DC current, a third inverter converting the DC current supplied from the third rectifier circuit into an AC current and supplying it to the second motor and having; The fourth power supply device a fourth transformer receiving AC power from the AC busbar, A fourth rectifier circuit that converts the alternating current supplied from the fourth transformer into a direct current; A fourth inverter that converts the direct current supplied from the fourth rectifier circuit into an alternating current and supplies it to the second motor and has the third transformer is a delta-delta type transformer, and the fourth transformer is a delta-star type transformer, or the third transformer is a star-star type transformer, and the fourth transformer is a star-delta type transformer, the voltage phase of the primary winding of the first transformer is configured to be in the same phase as the voltage phase of the primary winding of the second transformer, the voltage phase of the primary winding of the third transformer is configured to be in the same phase as the voltage phase of the primary winding of the fourth transformer, the voltage phase of the primary winding of the first transformer is configured to be different from the voltage phase of the primary winding of the third transformer by 15 degrees The marine power supply system according to claim 1.

4. A first switch that opens and closes a first alternating current path connecting the first inverter and the first motor; A second switch that opens and closes a second alternating current path connecting the second inverter and the first motor; A third switch that opens and closes a third alternating current path connecting the first alternating current path and the second alternating current path; and a first control device that controls the first switch, the second switch, and the third switch further comprising the first control device has a first control mode in which the first switch is in a closed state, the second switch is in a closed state, and the third switch is in an open state; a second control mode in which the first switch is in a closed state, the second switch is in an open state, and the third switch is in a closed state; a third control mode in which the first switch is in an open state, the second switch is in a closed state, and the third switch is in a closed state and can be selectively executed The marine power supply system according to any one of claims 1 to 3.

5. When the first control device changes the control mode from the first control mode to the second control mode, the first control device is configured to automatically change the motor constant, which is an internal parameter of the first inverter; when the second control mode is executed, the first inverter is configured to operate based on the internal parameters including the automatically changed motor constant and a signal received from outside the first inverter The marine power supply system according to claim 4.

6. It further includes a failure detection device capable of detecting each of the failure of the power supply device of the first system and the failure of the power supply device of the second system. When the failure detection device detects the failure of the power supply device of the first system during the execution of the first control mode, The first control device is configured to switch the first switch from the closed state to the open state and switch the second switch from the closed state to the open state. After the second switch is switched to the open state, the first control device is configured to automatically change the internal parameters of the second inverter to the parameters for half output. The first control device is configured to switch the third switch from the open state to the closed state, and after the internal parameters of the second inverter are automatically changed to the parameters for half output, switch the second switch from the open state to the closed state to execute the third control mode. The marine power supply system according to claim 4.

7. It further includes a first communication circuit that transmits a signal for causing the slave-side inverter, which is the other of the first inverter and the second inverter, to perform follow-up synchronization control with the master-side inverter from the master-side inverter, which is one of the first inverter and the second inverter. When changing the control mode from the first control mode to the second control mode, the first control device is configured to switch the follow-up synchronization control using the first communication circuit from the effective state to the invalid state. The marine power supply system according to claim 4.

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