Marine power system, ship, power supply switching method, and readable storage medium

Abstract

A marine power system (12), a ship (10), a power supply switching method, and a readable storage medium. The marine power system (12) comprises a direct-current busbar (121), a rectifier assembly (122), and a power supply switching device (125). An input end of the rectifier assembly (122) is connected to an output end of the power supply switching device (125), an output end of the rectifier assembly (122) is connected to the direct-current busbar (121), and an input end of the power supply switching device (125) is connected to at least two alternating-current power supplies (123).

Description

Marine power system, ship, power switching method and readable storage medium Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a marine power system, a ship, a power switching method, and a readable storage medium. Background Art

[0002] In related technologies, the energy source for a ship's power system includes a DC power supply and / or an AC power supply. For systems using AC power as the energy source, a DC power distribution board is equipped with an AC power supply interface for connection. However, when multiple AC power sources are connected to the DC distribution board, a rectifier must be installed at the charging interface corresponding to each AC power source, increasing hardware costs and equipment installation space.

[0003] Summary of the Invention

[0004] In a first aspect, the present application provides a ship power system, which includes a DC busbar, a rectifier component and a power switching device, wherein the input end of the rectifier component is connected to the output end of the power switching device, the output end of the rectifier component is connected to the DC busbar, and the input end of the power switching device is connected to at least two AC power supplies.

[0005] In a second aspect, the present application provides a ship, comprising: a body; and the ship power system according to the first aspect, wherein the ship power system is installed on the body.

[0006] In a third aspect, the present application provides a power switching method for the ship power system described in the first aspect; the power switching method includes: determining a target power supply mode of the ship in response to a power supply mode switching instruction, different power supply modes match different AC power supplies; switching the current AC power supply of the ship to a target AC power supply that matches the target power supply mode.

[0007] In a fourth aspect, the present application provides a computer-readable storage medium having computer instructions stored thereon, which, when executed by a processor, implement the power switching method described in the third aspect of the present application.

[0008] In an embodiment of the present application, at least two AC power supplies are connected to a rectifier assembly through a power switching device, and are connected to a DC busbar through the rectifier assembly. On the one hand, multiple AC power supplies can share the rectifier assembly, thereby reducing hardware costs and equipment installation space; on the other hand, the power switching device can selectively connect multiple AC power supplies to the DC busbar, avoiding the circulation problem caused by the different AC power phase angles output by multiple AC power supplies, improving the safety of the ship's power system, and thus improving the operation safety of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0010] FIG1 is a schematic diagram of a ship according to an embodiment of the present application.

[0011] FIG2 is a schematic diagram of a ship power system in related art.

[0012] FIG3 is a schematic diagram of a marine power system according to an embodiment of the present application.

[0013] FIG. 4 is a schematic diagram of a power switching device according to an embodiment of the present application.

[0014] FIG5 is a schematic diagram of a power switching device including two switch loops according to an embodiment of the present application.

[0015] FIG6 is a schematic diagram of a power switching device including three switch loops according to an embodiment of the present application.

[0016] 7a and 7b are schematic diagrams of a power switching device including a circuit breaker according to an embodiment of the present application.

[0017] FIG8 is a schematic diagram of a power switching device including a switch assembly according to an embodiment of the present application.

[0018] FIG9 is a schematic diagram of a pre-fill control device according to an embodiment of the present application.

[0019] FIG10 is a circuit diagram of a pre-charge control device according to an embodiment of the present application.

[0020] FIG11 is a circuit diagram of a pre-charge control device according to another embodiment of the present application.

[0021] FIG12 is a circuit diagram of a pre-charge control device according to another embodiment of the present application.

[0022] FIG13 is a schematic diagram of a pre-charge control device using software control according to an embodiment of the present application.

[0023] FIG14 is a schematic diagram of a process of switching from a generator mode to a shore power mode according to an embodiment of the present application.

[0024] FIG15 is a schematic diagram of a process of switching from shore power mode to generator mode according to an embodiment of the present application.

[0025] FIG16 is an overall architecture diagram of a marine power system according to an embodiment of the present application. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0027] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0028] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a", "said" and "the" used in this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items. Unless otherwise indicated, similar words such as "front", "rear", "bottom" and / or "top" are only for ease of explanation and are not limited to one position or one spatial orientation. Similar words such as "connected" or "connected" are not limited to physical or mechanical connections, and can include electrical connections, whether direct or indirect. "Multiple" means at least two.

[0029] As shown in Figure 1, the present application provides a vessel 10, which includes a main body 11 and a marine power system 12. Marine power system 12 is mounted on main body 11. Vessel 10 can be any type of watercraft capable of sailing, such as a commercial ship, passenger ship, yacht, fishing boat, sailboat, civilian ship, cleaning boat, etc., and this application does not limit this.

[0030] Referring to Figure 2 , the shipboard power system 12 may include a DC busbar 121, a rectifier assembly 122, and an AC power source 123. The AC power source 123 is connected to the DC busbar 121 via the rectifier assembly 122. The AC power source 123 may include an AC shore power source 1231 and / or an AC generator 1232, and may also include at least one other AC power source. The AC shore power source 1231 may be AC ​​power output from an AC power output interface on shore; the AC generator 1232 may be any generator capable of generating AC power, such as an AC diesel generator. The rectifier assembly 122 converts the AC power output from the AC power source 123 into DC power, which is then output to the DC busbar 121 as the energy source for the shipboard power system 12, thereby powering the loads on the ship 10. The rectifier assembly 122 may be a device such as a rectifier or a charger capable of converting AC power into DC power. Furthermore, the shipboard power system 12 may include a DC power source 124, which can output DC power. The DC power source 124 may include, but is not limited to, at least one of a lithium battery, a supercapacitor, a hydrogen fuel cell, a photovoltaic cell, a DC shore power source, and the like.

[0031] When supplying power, the DC power source 124 and the AC power source 123 can form a hybrid power source. For example, the DC power source 124 can be used to power the loads on the vessel 10. When the DC power source 124 is insufficient, the AC power source 123 can be used to power the loads on the vessel 10 and charge the DC power source 124, thereby extending the range of the vessel 10 and improving the endurance of the vessel 10.

[0032] In some cases, the number of AC power sources 123 is greater than one. For example, AC power source 123 includes both AC shore power 1231 and AC generator 1232. If multiple AC power sources 123 are connected to the same rectifier assembly 122, the AC power output by these multiple AC power sources 123 may have phase angle differences, resulting in circulating current problems and damaging circuit components. Therefore, in related art, each AC power source 123 requires a separate rectifier assembly 122 to convert the AC power output from the AC power source 123 into DC power for connection to the DC network, increasing the hardware cost and equipment installation space of the shipboard power system 12.

[0033] Based on this, referring to FIG3 , the present application adds a power switching device 125 to the shipboard power system 12. The input of the rectifier assembly 122 is connected to the output of the power switching device 125, which in turn is connected to the DC busbar 121. The input of the power switching device 125 is connected to at least two AC power sources 123. The power switching device 125 can selectively connect multiple AC power sources 123 to the DC busbar 121. This allows multiple AC power sources 123 to share the rectifier assembly 122, reducing hardware costs and equipment installation space. Furthermore, it avoids circulating current issues caused by the different phase angles of the AC power output by multiple AC power sources 123, improving the safety of the shipboard power system 12 and, consequently, the operational safety of the vessel 10. The following describes an embodiment of the shipboard power system 12 with the power switching device 125 added.

[0034] Referring to Figure 4, the power switching device 125 includes a multi-way switch circuit, each switch circuit is connected between the rectifier component 122 and an AC power source 123, and any two switch circuits in the multi-way switch circuit are mutually exclusive. Any two switch circuits in the multi-way switch circuit are mutually exclusive, which means that any two switch circuits mentioned above are not turned on at the same time. For example, when one switch circuit is turned on, the other switch circuit is disconnected. Or, both switch circuits are disconnected. By adopting a power switching device 125 including a multi-way switch circuit, when multiple AC power sources 123 are included, only a multi-way switch circuit needs to be set up, and there is no need to set up multiple rectifier components 122. Since the hardware cost and volume of the switch circuit are much lower than those of the rectifier component 122, it can effectively reduce the hardware cost and the space for equipment installation.

[0035] Taking the example of at least two AC power sources 123 including an AC shore power source 1231 and an AC generator 1232, the power switching device 125 includes two switch circuits, designated switch circuit A and switch circuit B. Switch circuit A is connected to the rectifier assembly 122 and the AC shore power source 1231. When switch circuit A is on, the AC shore power source 1231 outputs AC power to the rectifier assembly 122, which rectifies the AC power output from the AC shore power source 1231 and inputs it to the DC busbar 121. Switch circuit B is connected to the rectifier assembly 122 and the AC generator 1232. When switch circuit B is on, the AC generator 1232 outputs AC power to the rectifier assembly 122, which rectifies the AC power output from the AC generator 1232 and inputs it to the DC busbar 121. Switch circuit A and switch circuit B are mutually exclusive. That is, when switch circuit A is on, switch circuit B is off; when switch circuit B is on, switch circuit A is off. Of course, switch loop A and switch loop B can also be disconnected at the same time. In this way, the AC shore power 1231 and the AC generator 1232 will not be connected to the rectifier assembly 122 at the same time, thereby avoiding the circulation problem.

[0036] In some embodiments, each switching circuit includes a relay, and the relay includes a main contactor, a normally open contact, and a normally closed contact. The main contactor of the relay of each switching circuit is connected to the normally open contact of the relay of the switching circuit and the normally closed contacts of the relays of the remaining switching circuits. This embodiment uses relays to form the switching circuit, which has a simple circuit structure and low hardware cost. In addition, it is only necessary to control the power supply or power loss of the relay to control the corresponding switching circuit to be turned on or off, and the control logic is simple. The structure of the power switching device 125 is illustrated below by taking the cases where the power switching device 125 includes two switching circuits and three switching circuits as examples.

[0037] Figure 5 illustrates a case where the power switching device 125 includes two switching circuits. As shown in Figure 5 , K11 and K22 represent relays, K1 represents the main contactor of relay K11, K2 represents the main contactor of relay K22, K1-1 and K1-2 represent the normally open and normally closed contacts of relay K11, respectively, and K2-1 and K2-2 represent the normally open and normally closed contacts of relay K22, respectively. The switching circuit in which relay K11 resides (hereinafter referred to as Circuit 1) includes the main contactor K1, the normally open contact K1-1, and the normally closed contact K2-2. The switching circuit in which relay K22 resides (hereinafter referred to as Circuit 2) includes the main contactor K2, the normally open contact K2-1, and the normally closed contact K1-2. The main contactor K1 of circuit 1 is connected to the normally open contact K1-1 of circuit 1, the normally open contact K1-1 of circuit 1 is connected to the normally closed contact K2-2 of circuit 2, the main contactor K2 of circuit 2 is connected to the normally open contact K2-1 of circuit 2, and the normally open contact K2-1 of circuit 2 is connected to the normally closed contact K1-2 of circuit 1.

[0038] For the normally open contact K1-1, when the main contactor K1 is de-energized, it remains open. When the main contactor K1 is energized, it remains closed. For the normally closed contact K1-2, when the main contactor K1 is de-energized, it remains closed. When the main contactor K1 is energized, it remains open. The same applies to the normally open contacts K2-1 and K2-2.

[0039] When both main contactors K1 and K2 are de-energized, normally open contacts K1-1 and K2-1 are open, normally closed contacts K1-2 and K2-2 are closed, and circuits 1 and 2 are both disconnected. When main contactor K1 is energized, normally open contact K1-1 closes. Since main contactor K2 is de-energized, normally closed contact K2-2 is closed. Therefore, circuit 1, consisting of normally closed contact K2-2, normally open contact K1-1, and main contactor K1, is connected. Since normally closed contact K1-2 remains open when main contactor K1 is energized, circuit 2 remains disconnected. At this point, if main contactor K2 is energized, normally open contact K2-1 becomes closed, normally closed contact K2-2 becomes open, and main contactor K1 loses power. Circuit 1, formed by normally closed contact K2-2, normally open contact K1-1, and main contactor K1, becomes disconnected, while normally closed contact K1-2 remains closed. Circuit 2, formed by normally closed contact K1-2, normally open contact K2-1, and main contactor K2, becomes conductive. Therefore, circuits 1 and 2 are never conductive at the same time, achieving mutual exclusion between circuits 1 and 2, thereby achieving electrical isolation between the two AC power sources 123.

[0040] Figure 6 illustrates a case where the power switching device 125 includes three switching circuits. As shown in Figure 6 , K33 represents a relay, K3 represents the main contactor of relay K33, K3-1 represents the normally open contact of relay K33, and K3-2 represents the normally closed contact of relay K33. The meanings of the remaining symbols and the operating principle of relay K33 can be found in the corresponding embodiment of Figure 5 and will not be repeated here. It should be noted that in Figure 6 , K2-2 on circuit 1 and K2-2 on circuit 3 represent the same type of component, both of which are normally closed contacts of relay K22; K3-2 on circuit 1 and K3-2 on circuit 2 represent the same type of component, both of which are normally closed contacts of relay K33; and K1-2 on circuit 2 and K1-2 on circuit 3 represent the same type of component, both of which are normally closed contacts of relay K11.

[0041] When the main contactors K1, K2 and K3 are not energized, the normally open contacts K1-1, K2-1 and K3-1 are all in the open state, the normally closed contacts K1-2, K2-2 and K3-2 are all in the closed state, and loops 1, 2 and 3 (the switching circuit where relay K33 is located, including the main contactor K3, the normally open contact K3-1 and the normally closed contact K1-2) are all disconnected.

[0042] When main contactor K1 is energized, normally open contact K1-1 closes and normally closed contact K1-2 opens. Since normally closed contacts K2-2 and K3-2 are closed, circuit 1, consisting of normally closed contact K3-2, normally closed contact K2-2, normally open contact K1-1, and main contactor K1, is connected. Since normally open contacts K2-1 and K3-1 are both open, circuits 2 and 3 are disconnected.

[0043] When main contactor K2 is energized, normally open contact K2-1 closes and normally closed contact K2-2 opens. Since normally closed contact K2-2 opens, both circuits 1 and 3 are disconnected. When main contactors K1 and K3 lose power, normally open contacts K1-1 and K3-1 open, while normally closed contacts K1-2 and K3-2 close. Therefore, circuit 2, consisting of normally closed contact K1-2, normally closed contact K3-2, normally open contact K2-1, and main contactor K2, becomes conductive.

[0044] When main contactor K3 is energized, normally open contact K3-1 closes and normally closed contact K3-2 opens. Since normally closed contact K3-2 opens, circuits 1 and 2 are disconnected. When main contactors K1 and K2 lose power, normally open contacts K1-1 and K2-1 open, while normally closed contacts K1-2 and K2-2 close. Therefore, circuit 3, consisting of normally closed contact K2-2, normally closed contact K1-2, normally open contact K3-1, and main contactor K3, becomes conductive.

[0045] In summary, at any time, only one of loop 1, loop 2 and loop 3 is conductive, thereby achieving mutual exclusion of loop 1, loop 2 and loop 3, thereby achieving electrical isolation between the three AC power sources 123.

[0046] Any one of the above-mentioned loops 1, 2 and 3 can be loop A connected to the rectifier component 122 and the AC shore power 1231 in the aforementioned embodiment, or loop B connected to the rectifier component 122 and the AC generator 1232, or loop C connected to the rectifier component 122 and other AC power sources.

[0047] It is understood that when the number of AC power sources 123 is greater than 3, the working principle of the power switching device 125 is similar to the above embodiment. With the above solution, only one power switching device 125 is required to achieve electrical isolation between two or more AC power sources 123.

[0048] In some embodiments, the marine power system 12 may further include multiple switch assemblies, each corresponding to a switch circuit. Each switch assembly may have an open state and a closed state. When the switch assembly is in the closed state, the corresponding switch circuit is conductive, thereby connecting the AC power source 123 connected to the switch circuit to the rectifier assembly 122; when the switch assembly is in the open state, the corresponding switch circuit is disconnected, thereby disconnecting the AC power source 123 connected to the switch circuit from the rectifier assembly 122. By providing multiple switch assemblies, the user only needs to operate the corresponding switch assembly to control the state of each switch circuit, thereby improving the convenience of controlling the switch circuit.

[0049] As shown in Figure 5 , the multiple switch assemblies include a switch assembly S1 corresponding to loop 1 and a switch assembly S2 corresponding to loop 2. As shown in Figure 6 , the multiple switch assemblies include a switch assembly S1 corresponding to loop 1, a switch assembly S2 corresponding to loop 2, and a switch assembly S3 corresponding to loop 3. It is understood that when the number of switch loops is greater than three, the number of switch assemblies can be increased accordingly, and this application will not elaborate on this further.

[0050] In some embodiments, the switch assembly includes a local switch unit, one end of which is connected to the corresponding switch circuit, and the other end is connected to a local DC power supply. In other embodiments, the switch assembly includes a remote switch unit, one end of which is connected to the corresponding switch circuit, and the other end is connected to a remote DC power supply. Wherein, the DC power supply (including the local DC power supply and the remote DC power supply) is used to provide electrical energy to the relay on the switch circuit when the local switch unit or the remote switch unit corresponding to the switch circuit is closed, so that the main contactor of the relay on the switch circuit is energized, thereby closing the normally open contact of the relay and disconnecting the normally closed contact of the relay, thereby turning on the switch circuit. When the local switch unit and the remote switch unit corresponding to the switch circuit are both disconnected, the main contactor of the relay on the switch circuit loses power, and the switch circuit is disconnected.

[0051] Taking the example of the number of switch loops being 2, and referring to FIG8 , S1 and S2 represent local switch units, and S1′ and S2′ represent remote switch units. A user can control the local switch unit S1 to close at the local location deployed in the shipboard power system 12, or remotely control the remote switch unit S1′ to close, to connect loop 1. It is also possible to control the switch unit S1 to open locally, or remotely control the remote switch unit S1′ to open. When both S1 and S1′ are disconnected, loop 1 is disconnected. The control method for loop 2 is similar to that for loop 1 and will not be described in detail here.

[0052] The rectifier assembly 122 and the power switching device 125 can be deployed in a control cabinet, and the local switch unit can also be installed in the control cabinet. By installing the local switch unit in the control cabinet where the rectifier assembly 122 and the power switching device 125 are located, the user can conveniently control the corresponding switch circuit to be turned on or off by operating the local switch unit when performing fault diagnosis and troubleshooting, thereby facilitating fault diagnosis and troubleshooting. The remote switch unit can be installed in the cockpit of the vessel 10, making it convenient for the user to control the corresponding switch circuit to be turned on or off while operating the vessel 10. Therefore, by installing the local switch unit and the remote switch unit, the user's control needs in various application scenarios can be met.

[0053] Continuing with Figure 8 , when the switch assembly includes both local switch units and remote switch units, the marine power system 12 further includes a switching element Sx. The switching element Sx is connected to multiple switch assemblies and is used to select whether the corresponding switch circuit is controlled by the local switch unit or the remote switch unit. When the switching element Sx is activated, the corresponding switch circuit is controlled by the local switch unit. When the switching element Sx is inactivated, the corresponding switch circuit is controlled by the remote switch unit. As shown in Figure 8 , the switching element Sx can be connected to multiple local switch units. The switching unit Sx can be a toggle switch. The toggle switch is activated when closed and inactivated when open. By closing the toggle switch, the user can control the corresponding switch circuit to be turned on or off by the local switch unit, or by opening the toggle switch, the user can control the corresponding switch circuit to be turned on or off by the remote switch unit. By configuring the switching element Sx, the user can quickly switch the switch unit controlling the switch circuit to the local switch unit or the remote switch unit by controlling the switching element Sx to be activated or inactivated, thereby improving the convenience and efficiency of switching the switch units.

[0054] In the case where the switch assembly includes a local switch unit, the ship power system 12 may further include a DC conversion assembly, the input end of which is connected to the DC busbar 121, and the output end of which is connected to the local switch unit. In some embodiments, the DC conversion assembly may include a DC converter (Direct Current to Direct Current Converter, DC-DC). The DC converter may convert the voltage output by the DC busbar 121 into a voltage compatible with the local switch unit, and the converted voltage may be used as a local DC power supply and output to the local switch unit. In this way, power can be directly taken from the DC busbar 121 without setting up an additional local DC power supply. Since the output voltage of the DC busbar 121 may not match the operating voltage of the local switch unit, the output voltage of the DC busbar 121 is converted by the DC converter and output to the local switch unit to ensure that the local switch unit can work normally.

[0055] In some embodiments, each relay includes at least two normally open contacts. One normally open contact of each switching circuit is used to connect to the normally closed contacts of the relays of the remaining switching circuits, and the remaining normally open contacts are used to connect to the rectifier component 122 and the AC power supply 123. Specifically, the two ends of each of the remaining normally open contacts of the relay are used to connect to the AC power supply 123 and the rectifier component 122 respectively. Taking the number of switching circuits as 2 as an example, and referring to Figures 5, 7a and 7b, the normally open contacts of relay K11 include K1-1 and K x 1-1, the normally open contacts of relay K22 include K2-1 and K x 2-1. The normally open contact K1-1 of the relay K11 is used to connect the normally closed contacts of the relays of the remaining switch circuits (i.e., the relay K22), which is the normally closed contact K2-2 in this embodiment. The remaining normally open contacts K x 1-1 (can be one or more) is used to connect the rectifier assembly 122 and the AC power supply 123. The normally open contact K2-1 of the relay K22 is used to connect the normally closed contacts of the relays of the remaining switch circuits (i.e., the relay K11), in this embodiment, the normally closed contacts K1-2, and the remaining normally open contacts K1-1 of the relay K22 are used to connect the normally closed contacts of the relays (i.e., the relay K11). x 2-1 (can be one or more) is used to connect the rectifier component 122 and the AC power supply 123.

[0056] As shown in Figure 7b, when the main contactor K1 of relay K11 is energized, the normally open contact K x 1-1 is closed, thus the normally open contact K x The AC power supply 123 connected to 1-1 is connected to the rectifier component 122; when the main contactor K1 of the relay K11 loses power, the normally open contact K x1-1 is disconnected, thus the normally open contact K x The connection between the AC power supply 123 connected to 1-1 and the rectifier assembly 122 is disconnected. Normally open contact K x The working principle of 2-1 is similar and will not be repeated here.

[0057] The two ends of the normally open contact of the relay are used to connect the AC power supply 123 and the rectifier assembly 122. When the AC power supply 123 is a single-phase AC power supply, the relay includes two normally closed contacts, and the two ends of one of the normally closed contacts are used to connect the AC power supply 123 and the rectifier assembly 122. When the AC power supply 123 is a three-phase AC power supply, as shown in Figure 7b, the relay includes four normally closed contacts, three of which are normally closed contacts K x Both ends of 1 - 1 are used to connect to the AC power source 123 and the rectifier component 122 respectively.

[0058] Continuing with Figure 7a, the shipboard power system 12 also includes a circuit breaker, which is used to connect the rectifier assembly 122 and the AC power source 123. The remaining normally open contacts of the relay are used to connect the circuit breaker. The number of circuit breakers can match the number of switching circuits, with each circuit breaker corresponding to one switching circuit. As shown in Figure 7a, when the number of switching circuits is two, the number of circuit breakers is also two, with the two circuit breakers being designated as circuit breaker Q1 and circuit breaker Q2. When the circuit breaker is closed, the AC power source 123 connected to the corresponding switching circuit is connected to the rectifier assembly 122, causing the rectifier assembly 122 to rectify the AC power output by the AC power source 123 connected to the corresponding switching circuit and then input it into the DC busbar 121. When the circuit breaker is open, the AC power source 123 connected to the corresponding switching circuit is disconnected from the rectifier assembly 122, causing the AC power source 123 connected to the corresponding switching circuit to stop outputting AC power to the rectifier assembly 122.

[0059] In some embodiments, the state of the circuit breaker can be controlled by the switch circuit corresponding to the circuit breaker. When the switch circuit is on, the circuit breaker corresponding to the switch circuit is closed; when the switch circuit is off, the circuit breaker corresponding to the switch circuit is open. Referring to Figures 5 and 7a, when the main contactor K1 of the relay K11 is energized, the normally open contact K x 1-1 is closed, so the circuit breaker Q1 corresponding to circuit 1 is closed. When the main contactor K1 of relay K11 loses power, the normally open contact K x 1-1 is disconnected, thereby disconnecting circuit breaker Q1 corresponding to circuit 1. The operating principle of circuit breaker Q2 is similar to that of circuit breaker Q1 and will not be further described here. By providing a circuit breaker, it can protect the relays in the corresponding switching circuit and reduce damage to the relays in the corresponding switching circuit due to excessive current flowing through the switching circuit.

[0060] It should be noted that in the above embodiment, multiple AC power sources 123 can share a group of rectifier assemblies 122, wherein a group of rectifier assemblies 122 can include one or more rectifier assemblies 122. For example, in the embodiment shown in Figures 7a and 7b, the number of rectifier assemblies 122 is two, and these two rectifier assemblies 122 are connected in parallel. In actual applications, the power of a single rectifier assembly 122 may not meet the power requirements required for circuit operation. Therefore, multiple parallel rectifier assemblies 122 can be provided. By making multiple rectifier assemblies 122 work simultaneously, the power requirements required for circuit operation can be met. It will be understood that the figures are only exemplary. In other examples, other numbers of rectifier assemblies 122 can also be provided according to actual power requirements.

[0061] In some embodiments, AC power source 123 includes a single-phase AC power source or a three-phase AC power source. When at least two AC power sources 123 include an AC generator 1232 and an AC shore power source 1231, AC generator 1232 can be a single-phase AC generator or a three-phase AC generator. A single-phase AC generator is used to output single-phase AC power, while a three-phase AC generator is used to output three-phase AC power. AC shore power source 1231 can be a single-phase AC shore power source or a three-phase AC shore power source. A single-phase AC shore power source is used to output single-phase AC power, while a three-phase AC shore power source is used to output three-phase AC power.

[0062] In some embodiments, the marine power system 12 of the present application further includes a battery 1241, a component to be pre-charged 126, a power-on self-starting device 127, and a pre-charge control device 128. The battery 1241 can supply power to the component to be pre-charged 126 via the DC bus 121. Referring to FIG. 9, the pre-charge control device 128 includes:

[0063] The switch unit 1281 is connected between the battery 1241 and the power-on self-starting device 127;

[0064] A trigger unit 1282 , the trigger unit 1282 is connected to the switch unit 1281 ;

[0065] Before the pre-charging of the pre-charged component 126 is completed, the trigger unit 1282 is in a non-triggering state, so that the switch unit 1281 is in an off state, thereby disconnecting the power supply circuit between the battery 1241 and the power-on self-starting device 127;

[0066] When the pre-charging component 126 is completed, the trigger unit 1282 is in a trigger state, so that the switch unit 1281 is in a closed state to conduct the power supply circuit between the battery 1241 and the power-on self-starting device 127.

[0067] Among them, the switch unit 1281 can be electrically connected between the battery 1241 and the power-on self-starting device 127. The power-on self-starting device 127 and the switch unit 1281 can be two physically independent hardware devices, or the switch unit 1281 can also be integrated at the front end of the power-on self-starting device 127.

[0068] The trigger unit 1282 can be electrically or communicatively connected to the switch unit 1281. The trigger unit 1282 can have two states: a triggered state and a de-triggered state. These two states can automatically switch in response to the pre-charge state of the pre-charged component 126. The pre-charged state of the pre-charged component 126 includes a pre-charged state and a pre-charged complete state. Before the pre-charge of the pre-charged component 126 is complete, the pre-charged component 126 is in the pre-charged state; after the pre-charge of the pre-charged component 126 is complete, the pre-charged component 126 is in the pre-charged complete state. Initially, the trigger unit 1282 can be in the de-triggered state. In response to the pre-charge completion of the pre-charged component 126, the trigger unit 1282 can automatically switch from the de-triggered state to the triggered state. The state of the switch unit 1281 can change based on the state of the trigger unit 1282. When the trigger unit 1282 is in the de-triggered state, the switch unit 1281 can automatically switch to the open state; when the trigger unit 1282 is in the triggered state, the switch unit 1281 can automatically switch to the closed state. In this way, there is no need to manually control the switch unit 1281 to open or close, which improves the control efficiency of the switch unit 1281 and reduces the labor cost and operation complexity of the pre-charging control.

[0069] Furthermore, if the switch unit 1281 is manually turned on and off, the user may forget to close the switch unit 1281 after pre-charging is complete. In this case, the connection path between the battery 1241 and the self-starting device 127 remains disconnected, and the self-starting device 127 cannot obtain power from the battery 1241. Consequently, loads connected to the self-starting device 127, such as electrical controls and lighting, cannot be powered and function, seriously affecting the normal operation and use of the vessel 10.

[0070] In some embodiments, the state of the trigger unit 1282 is determined based on the duration of time the battery 1241 is powered on. If the duration of time the battery 1241 is powered on does not reach the preset duration, the trigger unit 1282 is in a non-triggered state. If the duration of time the battery 1241 is powered on reaches the preset duration, the trigger unit 1282 is in a triggered state. The preset duration can be pre-set based on the duration required for pre-charging to complete. Assuming that the duration required for pre-charging to complete is T, the preset duration can be set to a value greater than or equal to T. The duration required for pre-charging of different types or models of components to be pre-charged 126 may be different. Therefore, the duration required for pre-charging of the component to be pre-charged 126 to complete can be pre-calculated based on factors such as the type and / or model of the component to be pre-charged 126, and then the preset duration can be set based on the duration, thereby ensuring that the power supply circuit between the power-on self-starting device 127 and the battery 1241 is only turned on when the pre-charging of the component to be pre-charged 126 is completed.

[0071] Several implementations of the trigger unit 1282 are described below with examples.

[0072] In some embodiments, referring to FIG. 10 , the trigger unit 1282 includes a delay element KT11, and the switch unit 1281 includes a first switch element KT12. Terminals A1 and A2 of the delay element KT11 are connected to the positive output terminal Out+ and the negative output terminal Out- of the battery 1241, respectively. Terminal B1 of the first switch element KT12 is connected to terminal A1 of the delay element KT11 connected to the positive output terminal Out+ of the battery 1241. Terminal B2 of the first switch element KT12 is connected to the positive input terminal IN+ of the power-on self-starting device 127.

[0073] The delay element KT11 can be a magnetic delay element (e.g., a coil) or a capacitive delay element (e.g., a capacitor). When the delay element KT11 is not powered, the trigger unit 1282 is in a non-triggered state, the first switch element KT12 is in a disconnected state, and the power supply circuit between the battery 1241 and the power-on self-starting device 127 is disconnected. After the battery 1241 is powered, current flows from the positive output terminal Out+ of the battery 1241 through the delay element KT11 to the negative output terminal Out- of the battery 1241, and the delay element KT11 is powered. When the delay element KT11 is powered for a predetermined duration, the trigger unit 1282 is in a triggered state, thereby closing the first switch element KT12. At this time, the current can flow from the positive output terminal Out+ of the battery 1241 through the first switching element KT12 to the positive input terminal IN+ of the power-on self-starting device 127, and then flow through the negative input terminal IN- of the power-on self-starting device 127 to the negative output terminal Out- of the battery 1241, and the power supply circuit between the battery 1241 and the power-on self-starting device 127 is connected.

[0074] Optionally, the delay element KT11 and the first switching element KT12 can form a delay relay. For example, when the delay element KT11 is a magnetic delay element, the delay element KT11 and the first switching element KT12 can form an electromagnetic delay relay; when the delay element KT11 is a capacitive delay element, the delay element KT11 and the first switching element KT12 can form a capacitive delay relay.

[0075] This embodiment uses a delay element KT11 and a first switch element KT12 to realize automatic delayed power-on of the power-on self-starting device 127 after the pre-charge component 126 is pre-charged. The structure is simple and there is no need for the user to manually operate the first switch element KT12.

[0076] In other embodiments, referring to FIG. 11 , the trigger unit 1282 includes a delay element KT11 and a magnetic element KM11, and the switch unit 1281 includes a first switch element KT12 and a second switch element KM12. The delay element KT11 has two terminals A1 and A2 connected between the positive output terminal Out+ and the negative output terminal Out- of the battery 1241, respectively. One terminal B1 of the first switch element KT12 is connected to the terminal A1 of the delay element KT11 connected to the positive output terminal Out+ of the battery 1241. The other terminal B2 of the first switch element KT12 is connected to one terminal C2 of the magnetic element KM11. The other terminal C1 of the magnetic element KM11 is connected to the negative output terminal Out- of the battery 1241. The second switch element KM12 is connected between the battery 1241 and the power-on self-starting device 127.

[0077] Among them, the delay element KT11 can also be a magnetic delay element or a capacitive delay element. In some embodiments, the delay element KT11 and the magnetic element KM11 are both coils. In the embodiment shown in Figure 11, the delay element KT11 has a delay function, the magnetic element KM11 has no delay function, and the state change of the trigger unit is mainly determined by the delay element KT11. Of course, in other embodiments, the delay element KT11 and the magnetic element KM11 can also both have a delay function, and the state change of the trigger unit can be jointly determined by the delay element KT11 and the magnetic element KM11, and this application does not limit this. In the embodiment shown in Figure 11, when the delay element KT11 is not powered, the trigger unit 1282 is in a non-triggered state, the first switch element KT12 and the second switch element KM12 are both in a disconnected state, and the power supply circuit between the battery 1241 and the power-on self-starting device 127 is disconnected. After battery 1241 is powered on, current flows from the positive output terminal Out+ of battery 1241 through delay element KT11 to the negative output terminal Out- of battery 1241, energizing delay element KT11. When the energized duration of delay element KT11 reaches a preset value, trigger unit 1282 enters a triggering state, closing first switch element KT12. At this point, current can flow from the positive output terminal Out+ of battery 1241 through first switch element KT12 to magnetic element KM11, and then to the negative output terminal Out- of battery 1241, energizing magnetic element KM11. After the magnetic element KM11 is energized, the second switch element KM12 is turned on, and current can flow from the positive output terminal Out+ of the battery 1241 to the positive input terminal IN+ of the power-on self-starting device 127, and then flow through the negative input terminal IN- of the power-on self-starting device 127 to the negative output terminal Out- of the battery 1241, so that the power supply circuit between the battery 1241 and the power-on self-starting device 127 is turned on.

[0078] When the power required by the power-on self-starting device 127 is high, the contacts of the delay element KT11 may experience overcurrent. By providing a magnetic element KM11 and a second switch element KM12, the current at the contacts of the delay element KT11 can be shunted, thereby reducing damage to the delay element KT11 due to excessive current and increasing the service life of the delay element KT11. The models of the magnetic element KM11 and the second switch element KM12 can be determined based on the maximum current in the circuit and are not limited in this application.

[0079] Continuing to refer to FIG11 , the second switch element KM12 includes at least one of the following: a second switch element KM12 connected between the positive output terminal Out+ of the battery 1241 and the positive input terminal IN+ of the power-on self-starting device 127 (as shown by KM12 on the right side of FIG11 ), and a second switch element KM12 connected between the negative output terminal Out- of the battery 1241 and the negative input terminal IN- of the power-on self-starting device 127 (as shown by KM12 on the left side of FIG11 ). By providing a second switch element KM12 between the positive output terminal Out+ of the battery 1241 and the positive input terminal IN+ of the power-on self-starting device 127, as well as between the negative output terminal Out- of the battery 1241 and the negative input terminal IN- of the power-on self-starting device 127, complete isolation of the power supply circuit between the battery 1241 and the power-on self-starting device 127 is achieved. This prevents the power-on self-starting device 127 from voltage-splitting the component to be pre-charged 126 before pre-charging is complete, reduces the current flow between the battery 1241 and the power-on self-starting device 127, and reduces the power consumption of the battery 1241. It is understood that only one of the two second switch elements KM12 can be retained, thereby reducing hardware costs and simplifying the circuit structure.

[0080] Referring to Figure 12, the pre-charge control device 128 also includes: at least one current limiting element F1 connected between the battery 1241 and the power-on self-starting device 127, which is used to limit the current of the power supply circuit when the power supply circuit is turned on. By setting at least one current limiting element F1, the pre-charge control device 128 can be protected to reduce circuit damage caused by overcurrent in the pre-charge control device 128. Among them, the current limiting element may include but is not limited to fuses or air switches. As shown in Figure 12, the current limiting element F1 can be set at the positive output terminal Out+ of the battery 1241, the negative output terminal Out- of the battery 1241, the positive input terminal IN+ of the power-on self-starting device 127, and the negative input terminal IN- of the power-on self-starting device 127. In addition to this method, the current limiting element F1 can also be set only at some of the above four positions.

[0081] The above embodiment illustrates a case where the trigger unit 1282 implements delayed turn-on of the power-on self-starting device 127 using hardware. Alternatively, the trigger unit 1282 may implement delayed turn-on of the power-on self-starting device 127 using software. The following describes an embodiment in which software is used to implement delayed turn-on of the power-on self-starting device 127.

[0082] In some embodiments, the trigger unit 1282 is used to obtain pre-charge information of the component to be pre-charged 126, and is in a triggered state or a non-triggered state in response to the pre-charge information. The pre-charge information is used to indicate whether the component to be pre-charged 126 has completed pre-charging. When the trigger unit 1282 is in a non-triggered state, the trigger unit 1282 can send a disconnect instruction to the switch unit 1281 to control the switch unit 1281 to disconnect. When the trigger unit 1282 is in a triggered state, the trigger unit 1282 can send a close instruction to the switch unit 1281 to control the switch unit 1281 to close. In this embodiment, after obtaining the pre-charge information, the trigger unit 1282 can send a disconnect instruction or a close instruction to the switch unit 1281, thereby controlling the state of the switch unit 1281. The above method is implemented by software, without the need for complex wiring, with a simple structure and low implementation cost.

[0083] Among them, the trigger unit 1282 can obtain pre-charging information from the battery 1241. The battery 1241 may include a battery management system (BMS). The battery management system can detect various charging and discharging states of the battery 1241, including whether the battery 1241 has completed pre-charging the component to be pre-charged 126. If the battery management system detects that the process of pre-charging the component to be pre-charged 126 by the battery 1241 is not completed, it can send pre-charging information indicating that the pre-charging is not completed to the trigger unit 1282; otherwise, it can send pre-charging information indicating that the pre-charging is completed to the trigger unit 1282.

[0084] Alternatively, the trigger unit 1282 may obtain pre-charging information from the component to be pre-charged 126. For example, the component to be pre-charged 126 may obtain its own voltage. If the voltage reaches a preset voltage threshold, it indicates that pre-charging is complete, and the component to be pre-charged 126 may send pre-charging information indicating that pre-charging is complete to the trigger unit 1282. If the voltage does not reach the preset voltage threshold, it indicates that pre-charging is incomplete, and the component to be pre-charged 126 may send pre-charging information indicating that pre-charging is incomplete to the trigger unit 1282.

[0085] The above method provides two optional solutions for the trigger unit 1282 to obtain pre-charge information. When the pre-charge information cannot be obtained through one of the methods, the pre-charge information can be obtained based on the other method, thereby reducing the problem of the trigger unit 1282 failing to successfully obtain the pre-charge information due to communication failures and other problems, thereby improving the stability of the system.

[0086] Referring to Figure 13, the trigger unit 1282 may include a first control unit 1282a and a second control unit 1282b, the first control unit 1282a is connected to the battery 1241 and the component to be pre-charged 126, and the second control unit 1282b is connected to the battery 1241. Among them, the first control unit 1282a is used to obtain pre-charge information from the battery 1241 or the component to be pre-charged 126, and the second control unit 1282b is used to obtain pre-charge information from the battery 1241. This embodiment adopts two control units, and the two control units can serve as redundant backups for each other, thereby improving the robustness of the system. In addition, the two control units obtain pre-charge information from different information acquisition paths, respectively, reducing the situation where the pre-charge information cannot be obtained due to the failure of one information acquisition path, thereby improving the stability of the system.

[0087] In some embodiments, different control priorities can be set for the first control unit 1282a and the second control unit 1282b. For example, a higher control priority can be set for the first control unit 1282a, and a lower control priority can be set for the second control unit 1282b, so that the first control unit 1282a can be used to control the on / off of the switch unit 1281 first, thereby avoiding duplicate instructions.

[0088] Specifically, when the first control unit 1282a is in normal operation, it can send an opening or closing instruction to the switch unit 1281 via the first control unit 1282a. When the first control unit 1282a is in an abnormal operation, it can send an opening or closing instruction to the switch unit 1281 via the second control unit 1282b. Because the first control unit 1282a can obtain pre-charge information from both the battery 1241 and the component to be pre-charged 126, the pre-charge information obtained by the first control unit 1282a is more comprehensive and reliable. Prioritizing the first control unit 1282a to send an opening or closing instruction to the switch unit 1281 effectively improves the reliability of the obtained pre-charge information. When the first control unit 1282a is in an abnormal operation, sending an opening or closing instruction to the switch unit 1281 via the second control unit 1282b enables the second control unit 1282b to provide a redundant backup for the first control unit 1282a, reducing the possibility of failure to properly control the switch unit 1281 due to a failure of the first control unit 1282a.

[0089] The second control unit 1282b can communicate with the first control unit 1282a and, based on the communication status between the second control unit 1282b and the first control unit 1282a, determine whether the first control unit 1282a is in a normal operating state. The second control unit 1282b can communicate with the first control unit 1282a using CAN communication, Profinet communication, or 485 communication. When communication between the second control unit 1282b and the first control unit 1282a is disconnected, the second control unit 1282b can determine that the first control unit 1282a is in an abnormal operating state. For example, the first control unit 1282a can send a heartbeat signal to the second control unit 1282b at a preset frequency. If the second control unit 1282b does not receive the heartbeat signal sent by the first control unit 1282a at the preset frequency, the second control unit 1282b confirms that communication between the second control unit 1282b and the first control unit 1282a is disconnected, thereby confirming that the first control unit 1282a is in an abnormal operating state. Otherwise, the second control unit 1282b confirms that the communication between the second control unit 1282b and the first control unit 1282a is not disconnected, thereby confirming that the first control unit 1282a is in a normal working state. In this way, the second control unit 1282b can effectively determine whether the first control unit 1282a is in a normal working state, and thus determine whether it is necessary to replace the first control unit 1282a to send an opening instruction or a closing instruction to the switch unit 1281, thereby improving the robustness of the system.

[0090] Alternatively, the first control unit 1282a can communicate with the switch unit 1281. Based on the communication status between the switch unit 1281 and the first control unit 1282a, the switch unit 1281 can determine whether the first control unit 1282a is in a normal operating state and report the status of the first control unit 1282a to the second control unit 1282b. When communication with the first control unit 1282a is lost, the switch unit 1281 determines that the first control unit 1282a is in an abnormal operating state and sends a signal to the second control unit 1282b indicating that the first control unit 1282a is in an abnormal operating state. In this embodiment, the function of determining whether the first control unit 1282a is in a normal operating state is decentralized to the switch unit 1281. The second control unit 1282b only needs to obtain the result of whether the first control unit 1282a is in a normal operating state from the switch unit 1281, without having to implement specific judgment logic. This effectively reduces the control pressure on the second control unit 1282b, allowing the second control unit 1282b to focus on implementing the original control logic without having to modify the original control logic of the second control unit 1282b.

[0091] In some embodiments, the first control unit 1282a is a power and energy management system (PEMS), and the second control unit 1282b is a battery management system for the battery 1241. As the control center of the marine power system 12, the PEMS has more powerful communication and signal processing capabilities than the battery management system. Therefore, the PEMS can be used preferentially to control the on / off switching of the switch unit 1281. When the PEMS is in an abnormal operating state, the battery management system controls the on / off switching of the switch unit 1281, thereby achieving redundant backup. Furthermore, in this embodiment, the existing equipment in the marine power system 12 is directly used to control the on / off switching of the switch unit 1281, eliminating the need for an additional controller to control the on / off switching of the switch unit 1281. This maximizes the utilization of the existing equipment in the marine power system 12 and helps simplify the circuit structure of the marine power system 12.

[0092] In some embodiments, the trigger unit 1282 is further configured to receive a status signal sent by the switch unit 1281, the status signal being used to indicate whether the switch unit 1281 is in an open state or a closed state, and to send the status signal to the display unit so that the display unit 1281 displays the status of the switch unit 1281 based on the status signal. The display unit may be provided in a control room or other location convenient for the user to view. By sending the status signal to the display unit for display, the user can intuitively observe the status of the switch unit 1281, thereby determining whether the status of the switch unit 1281 is consistent with the expected status. In the event that it is determined that the status of the switch unit 1281 is inconsistent with the expected status, the user may also control the status of the switch unit 1281 through manual control.

[0093] In some embodiments, after the battery 1241 is powered off, the trigger unit 1282 is deactivated, causing the switch unit 1281 to be disconnected and the power supply circuit disconnected. For example, in the embodiment shown in FIG10 , the trigger unit 1282 includes a delay element KT11. After the battery 1241 is powered off, the delay element KT11 is deactivated due to power loss, causing the first switch element KT12 to be disconnected, disconnecting the power supply circuit between the battery 1241 and the power-on self-starting device 127. In the embodiment shown in FIG11 , the trigger unit 1282 includes a delay element KT11 and a magnetic element KM11, and the switch unit 1281 includes a first switch element KT12 and a second switch element KM12. After the battery 1241 is powered off, the delay element KT11 is deactivated due to power loss, causing the first switch element KT12 to be disconnected. When the first switch element KT12 is in the off state, the magnetic element KM11 loses power, thereby disconnecting the second switch element KM12, disconnecting the power supply circuit between the battery 1241 and the power-on self-starting device 127. In the embodiment shown in Figure 13, after the battery 1241 is powered off, the first control unit 1282a or the second control unit 1282b can send a disconnect command to the switch unit 1281 to disconnect the switch unit 1281. In this way, after the battery 1241 is powered off, the power supply circuit between the battery 1241 and the power-on self-starting device 127 can be disconnected. This ensures that the power supply circuit between the battery 1241 and the power-on self-starting device 127 is disconnected when the next pre-charging cycle begins. This avoids the problem of the power supply circuit being connected during the next pre-charging cycle, which could cause the power-on self-starting device 127 to divide the voltage of the pre-charging component 126 and lead to pre-charging failure. Furthermore, the above process can be automatically implemented, eliminating the need for the user to manually operate the switch unit 1281, reducing user operation complexity and reducing control errors caused by user error.

[0094] In some embodiments, the vessel 10 includes at least two power supply modes, with different power supply modes matching different AC power sources 123. For example, when the AC power source 123 includes AC shore power 1231 and an AC generator 1232, the power supply modes may include a shore power mode and a generator mode. The shore power mode refers to a mode in which power is supplied by the AC shore power 1231, and the AC power source 123 matching the shore power mode is the AC shore power 1231. The generator mode refers to a mode in which power is supplied by the AC generator 1232, and the AC power source 123 matching the generator mode is the AC generator 1232. The present application enables switching the current AC power source of the vessel 10 from among at least two AC power sources 123. The specific method of switching the AC power source is described below with examples.

[0095] Referring to FIG14 , the present application provides a power switching method, which includes:

[0096] Step S1: In response to the power supply mode switching instruction, determining the target power supply mode of the vessel 10, where different power supply modes are matched with different AC power sources 123;

[0097] Step S2: Switch the current AC power supply of the vessel 10 to a target AC power supply that matches the target power supply mode.

[0098] The power switching method of the present application can be applied to the ship power system 12 in any of the aforementioned embodiments. In the case where the ship power system 12 includes the first control unit 1282a, the power switching method of this embodiment can be executed by the first control unit 1282a.

[0099] This embodiment switches the current AC power supply of the ship 10 to the target AC power supply, so that the current AC power supply of the ship 10 matches the target power supply mode of the ship 10, thereby improving the power supply security of the ship 10 and ensuring the operation safety of the ship 10.

[0100] In step S1, the first control unit 1282a may receive a power supply mode switching instruction. The power supply mode switching instruction may be sent by the user or may be automatically generated. For example, if the first control unit 1282a detects shore power access, the first control unit 1282a may automatically generate a power supply mode switching instruction. The power supply mode switching instruction may carry identification information of the target power supply mode, such as a name or number. In some embodiments, an interactive component corresponding to each power supply mode may be set separately. The interactive component may be a virtual button on the display screen, or a physical button or joystick on the console, etc. The user may operate the interactive component corresponding to the target power supply mode, thereby sending a power supply mode switching instruction carrying identification information of the target power supply mode to the first control unit 1282a. After receiving the power supply mode switching instruction, the first control unit 1282a may parse the target power supply mode from the power supply mode switching instruction.

[0101] Each power supply mode and the AC power source 123 that matches the power supply mode can be pre-stored in association. After parsing the target power supply mode, the first control unit 1282a can determine a target AC power source that matches the target power supply mode based on the association between the power supply mode and the AC power source 123. Assuming that the AC power source 123 includes an AC shore power source 1231 and an AC generator 1232, and the power supply modes include a shore power mode and a generator mode, an association can be established between the shore power mode and the AC shore power source 1231, and an association can be established between the generator mode and the AC generator 1232.

[0102] In step S2, the first control unit 1282a may switch the current AC power source of the vessel 10 to the target AC power source. During this switchover, the first control unit 1282a may control the switch circuit corresponding to the target AC power source in the power source switching device 125 to conduct, thereby causing the target AC power source to begin supplying power. Because the switch circuits corresponding to the AC power sources are mutually exclusive, when the switch circuit of the target AC power source is conducting, the switch circuits corresponding to the other AC power sources are disconnected, thereby stopping the supply of power from the other AC power sources.

[0103] For ease of understanding, the power switching method of the present application is described below using an example where the at least two AC power sources 123 include an AC generator 1232 and an AC shore power source 1231. It is understood that when the at least two AC power sources 123 include other AC power sources, the switching method is similar and will not be further described here.

[0104] Switching the current AC power source of the vessel 10 to a target AC power source that matches the target power supply mode includes: when the target power supply mode is a first power supply mode (i.e., generator mode) that matches the AC generator 1232, switching the current AC power source of the vessel 10 from the AC shore power 1231 to the AC generator 1232. When the target power supply mode is the generator mode, the AC generator 1232 is required to provide power, and therefore, the current AC power source is switched to the AC generator 1232.

[0105] When the shipboard power system 12 includes a battery 1241, switching the current AC power source of the ship 10 from the AC shore power 1231 to the AC generator 1232 includes: controlling the battery 1241 to start supplying power; after the battery 1241 starts supplying power, controlling the AC shore power 1231 to stop supplying power; and after the AC shore power 1231 stops supplying power, controlling the AC generator 1232 to start supplying power. Controlling the AC shore power 1231 to stop supplying power may include disconnecting a switch circuit corresponding to the AC shore power 1231. Controlling the AC generator 1232 to start supplying power may include connecting a switch circuit corresponding to the AC generator 1232.

[0106] Because different AC power sources 123 cannot supply power simultaneously, when switching between AC power sources 123, loads on vessel 10 may lose power and fail to operate properly. To address this issue, during the AC power source 123 switching process, this embodiment controls battery 1241 to begin supplying power, gradually transferring power from the AC shore power 1231 to the battery 1241. After battery 1241 begins supplying power, AC shore power 1231 is controlled to cease supplying power. This allows the loads on vessel 10 to continue to be powered by battery 1241 during the switchover from shore power to ship power, thus preventing load power loss. Similarly, after AC shore power 1231 ceases supplying power, the loads previously powered by battery 1241 are gradually transferred to AC generator 1232, thus completing the process of switching vessel 10's current AC power source from AC shore power 1231 to AC generator 1232.

[0107] In some embodiments, controlling AC generator 1232 to start supplying power includes determining whether the AC power output by AC generator 1232 is stable, and if so, controlling AC generator 1232 to start supplying power. Whether the AC power output by AC generator 1232 is stable can be determined based on the voltage, current, power, and / or frequency of the AC power output by AC generator 1232. For example, if the voltage of the AC power output by AC generator 1232 varies by a magnitude exceeding a preset value, the AC power output by AC generator 1232 is determined to be unstable; otherwise, the AC power output by AC generator 1232 is determined to be stable.

[0108] Specifically, the AC generator 1232 may be controlled to start working and the voltage of the AC power outputted by the AC generator 1232 may be detected. If the AC power outputted by the AC generator 1232 is determined to be stable, the switch circuit corresponding to the AC generator 1232 may be controlled to be turned on, thereby causing the AC generator 1232 to start supplying power.

[0109] Furthermore, the power switching method further includes: if the AC power output by AC generator 1232 is unstable, adjusting the AC power output by AC generator 1232, and returning to the step of determining whether the AC power output by AC generator 1232 is stable. Adjusting the AC power output by AC generator 1232 includes, but is not limited to, adjusting the voltage, current, power, and / or frequency of the AC power output by AC generator 1232. In the above embodiment, AC generator 1232 is controlled to begin supplying power only after the AC power output by AC generator 1232 stabilizes. This reduces the risk of AC power instability causing the AC power to not match the voltage required for normal load operation, thereby damaging the load and improving circuit safety.

[0110] In some embodiments, switching the current AC power source of the vessel 10 to a target AC power source that matches the target power supply mode includes: when the target power supply mode is a second power supply mode (i.e., shore power mode) that matches the AC shore power 1231, switching the current AC power source of the vessel 10 from the AC generator 1232 to the AC shore power 1231. When the target power supply mode is the shore power mode, power needs to be supplied by the AC shore power 1231, and therefore, the current AC power source is switched to the AC shore power 1231. In some embodiments, when the shore power interface in the ship power system 12 is connected to the AC shore power 1231, a power supply mode switching instruction corresponding to the shore power mode can be generated to determine the target power supply mode as the shore power mode.

[0111] Switching the current AC power source of the vessel 10 from the AC generator 1232 to the AC shore power 1231 includes determining whether the AC generator 1232 is in a power supply state, and if the AC generator 1232 is not in a power supply state, controlling the AC shore power 1231 to supply power. In this embodiment, when the AC generator 1232 is not in a power supply state, the switch circuit corresponding to the AC shore power 1231 can be directly turned on to enable the AC shore power 1231 to supply power.

[0112] Switching the current AC power source of the ship 10 from the AC generator 1232 to the AC shore power 1231 also includes: if the AC generator 1232 is in a power supply state, controlling the AC generator 1232 to stop supplying power, and after the AC generator 1232 stops supplying power, switching the current AC power source of the ship 10 to the AC shore power 1231. In this way, the circulation problem caused by the AC generator 1232 and the AC shore power 1231 supplying power at the same time can be avoided. Furthermore, if the AC generator 1232 is in a power supply state and the battery 1241 is not in a power supply state, the battery 1241 can be controlled to start supplying power first, and after the battery 1241 starts supplying power, the AC generator 1232 is controlled to stop supplying power, thereby avoiding the situation where the load loses power during the switching process between different AC power sources 123.

[0113] In some embodiments, the power switching method further includes: after controlling the AC generator 1232 to stop supplying power, confirming whether the switch circuit between the AC generator 1232 and the rectifier assembly 122 is disconnected. If not, returning to the step of controlling the AC generator 1232 to stop supplying power. In this embodiment, after the AC generator 1232 stops supplying power, the method first ensures that the switch circuit between the AC generator 1232 and the rectifier assembly 122 is disconnected, and then switches the current AC power source of the vessel 10 to the AC shore power 1231, to avoid the AC generator 1232 and the AC shore power 1231 being connected to the rectifier assembly 122 at the same time due to the switch circuit between the AC generator 1232 and the rectifier assembly 122 being connected. Specifically, in an embodiment in which the shipboard power system 12 includes a circuit breaker connecting the AC generator 1232 and the rectifier assembly 122, the disconnection of the switch circuit between the AC generator 1232 and the rectifier assembly 122 can be achieved by disconnecting the aforementioned circuit breaker. In the embodiment where the AC generator 1232 and the rectifier assembly 122 are connected via the remaining normally open contacts of the relay, the switch circuit between the AC generator 1232 and the rectifier assembly 122 is disconnected, which may be the disconnection of the aforementioned remaining normally open contacts.

[0114] In some embodiments, the target AC power source can be used to charge battery 1241 onboard vessel 10. The power switching method further includes obtaining the remaining charge of battery 1241 and controlling the charging current of battery 1241 by the target AC power source based on the remaining charge. The remaining charge of battery 1241 can be determined based on the state of charge (SOC) of battery 1241. In this manner, the charging current of battery 1241 can be controlled, thereby reducing battery 1241 wear caused by excessive charging current and improving the lifespan of battery 1241.

[0115] Controlling the charging current used by the target AC power source to charge battery 1241 based on the remaining charge includes: if the remaining charge is less than a first preset charge, controlling the target AC power source to charge battery 1241 with a first charging current; if the remaining current is greater than or equal to the first preset charge, controlling the target AC power source to charge battery 1241 with a second charging current. The first charging current is greater than the second charging current. The first preset charge can be pre-set, for example, to 80% of the total charge of battery 1241 or another value. In this embodiment, when the remaining charge of battery 1241 is low, a higher charging current is used to charge battery 1241, enabling faster charging and improving charging efficiency. When the remaining charge of battery 1241 is high, a lower charging current is used to charge battery 1241, reducing the rate of chemical reactions within battery 1241, minimizing excess charge accumulation, lowering the risk of overcharging battery 1241, and improving charging safety.

[0116] Furthermore, controlling the charging current used by the target AC power source to charge battery 1241 based on the remaining power also includes: if the remaining power is greater than a second preset power, controlling the target AC power source to charge battery 1241 with a third charging current. The third charging current is less than the second charging current, and the second preset power is greater than the first preset power. The second preset power can be set according to actual needs. For example, if the first preset power is set to 80% of the total power of battery 1241, the second preset power can be set to 90% of the total power of battery 1241. When the remaining power of battery 1241 is close to full power, charging battery 1241 with a smaller charging current can enable battery 1241 to charge at an extremely low rate, thereby achieving the effect of maintaining the battery power for a long time, and effectively reducing the rate of chemical reactions within battery 1241, avoiding thermal runaway, expansion, and other phenomena in battery 1241, thereby protecting the safety of battery 1241.

[0117] In this application, multiple AC power supplies 123 share a rectifier component and are connected to the DC bus 121. At the same time, from a safety perspective, the switch circuits corresponding to the multiple AC power supplies 123 are set to be mutually exclusive, avoiding two different AC power supplies 123 from being connected in parallel and supplying power at the same time, thereby improving the safety and economy of the power supply and reducing the equipment installation space and weight.

[0118] Figures 14 and 15 show the overall flow chart of the power switching process. As shown in Figure 14, it is a schematic diagram of the process of switching from generator mode to shore power mode. When in generator mode (step S11), it can be determined whether the shore power mode is activated (step S12). If so, it starts to enter the shore power mode (step S13), otherwise it maintains the current generator mode (step S11). Before entering the shore power mode, it can be determined whether the AC generator 1232 is online, that is, whether the AC generator 1232 is in the power supply state (step S14). If so, the AC generator 1232 is controlled to transfer the load and de-energize (step S15), and then it is determined whether the circuit breaker connected to the AC generator 1232 is disconnected (step S17). If so, the switch circuit corresponding to the AC shore power 1231 is closed (step S16) to successfully enter the shore power mode, otherwise it returns to step S15. Controlling AC generator 1232 to transfer load can be understood as controlling AC generator 1232 to gradually reduce its output, and controlling AC generator 1232 to de-energize can be understood as controlling the corresponding switch circuit of AC generator 1232 to disconnect. Controlling AC generator 1232 to transfer load first and then de-energizing AC generator 1232 can avoid the problem of excessive current generated by directly de-energizing AC generator 1232, thereby improving the safety of the marine power system 12.

[0119] In generator mode and shore power mode, the battery 1241 can be charged by the AC generator 1232 or the AC shore power 1231. It can be determined whether the SOC of the battery 1241 is less than a first preset power level (for example, 80%) (step S18). If so, the battery 1241 is charged with a larger charging current (i.e., the first charging current) (referred to as high-current charging) (step S19). If not, the battery 1241 is charged with a smaller charging current (i.e., the second charging current) (referred to as low-current charging) (step S20). Then, it is further determined whether the SOC of the battery 1241 is greater than a second preset power level (for example, 90%) (step S21). If so, the battery 1241 is charged with a smaller charging current (i.e., the third charging current) (referred to as trickle charging) (step S22), otherwise, the process returns to step S18.

[0120] As shown in Figure 15, it is a schematic diagram of the process of switching from shore power mode to generator mode. When in shore power mode (step S31), it can be determined whether the AC generator 1232 is online (step S32), that is, whether the AC generator 1232 is in a power supply state. If so, the battery 1241 is started (step S33), otherwise it returns to step S31. After the battery 1241 is started, it is determined whether the voltage and / or frequency of the AC power output by the AC generator 1232 is stable (step S34). If not, the voltage and / or frequency of the AC power output by the AC generator 1232 is adjusted (step S35). Otherwise, the switch circuit corresponding to the AC shore power 1231 is disconnected (step S36), and then the circuit breaker corresponding to the AC generator 1232 is closed (step S37), thereby switching to generator mode (step S38).

[0121] The above embodiment realizes free switching between shore power mode and generator mode, and can adapt the current AC power supply of the ship 10 to the target power supply mode, thereby improving the power supply safety and reliability of the ship 10.

[0122] Figure 16 shows the overall circuit diagram of the ship power system 12 of the present application. The DC power supply 124 of the ship 10 includes a lithium battery pack connected to the DC bus 121, a solar photovoltaic panel and a DC charging pile. Among them, the lithium battery pack includes at least one battery 1241, which serves as the main power source of the ship 10, and the solar photovoltaic panel serves as an auxiliary power source. At the same time, a diesel generator set is configured as an extender unit, and the diesel generator set includes at least one diesel generator 1232. When the SOC of the lithium battery pack is <30%, the diesel generator set can supply power to the load on the ship 10 and charge the lithium battery pack. The AC shore power interface is used to access the AC shore power 1231. The diesel generator set and the AC shore power interface are connected to the DC bus 121 through the same rectifier component 122 (such as a rectifier). The AC shore power interface is electrically isolated from the diesel generator set input to avoid simultaneous power supply. The switch circuits and rectifiers corresponding to the diesel generator set and the AC shore power interface are integrated in the control cabinet. The switch circuit is provided with an RS485 remote control interface, and remote operation of the switch circuit can be achieved through the remote control component (i.e., the first control unit 1282a in the aforementioned embodiment).

[0123] A hybrid power source, comprised of a diesel generator set and a lithium-ion battery pack, supplies power to the loads onboard vessel 10, meeting the power requirements of vessel 10 under various operating conditions. To ensure reliable power supply, vessel 10 utilizes two sets of these power supply devices, each providing redundancy. While docked at a pier, vessel 10 can charge the lithium-ion battery pack using shore-based DC charging stations, AC shore power ports, and portable chargers. The specific charging method is determined based on operational needs.

[0124] When the ship 10 operates in generator mode, the switch circuit corresponding to the diesel generator set is remotely closed through the remote control component, so that the diesel generator set is connected to the rectifier, and then connected to the DC bus 121 through the rectifier. The remote control component remotely communicates with the rectifier through the RS458 interface, adjusts the voltage and current output by the rectifier, and realizes power supply to the load of the ship 10 and charging of the lithium battery pack.

[0125] When vessel 10 docks and switches to shore power, the remote control unit switches the diesel generator set off, de-energizes, and shuts down the generator set to ensure uninterrupted power supply, while keeping the lithium-ion battery pack operational. Subsequently, the switch circuit corresponding to AC shore power 1231 is switched on, connecting AC shore power 1231 to the rectifier, which then connects to DC busbar 121. The remote control unit communicates with the rectifier via an RS458 interface, adjusting the rectifier's output voltage and current to power vessel 10's loads and charge the lithium-ion battery pack.

[0126] When switching from shore power mode to generator mode, since there may be a phase angle difference between the AC shore power and the AC power output by the diesel generator set, the interlocking method cannot be used to connect to the rectifier at the same time. Therefore, the battery 1241 is first started through the remote control component to ensure the voltage of the DC busbar 121. After the output of the diesel generator set stabilizes, the battery 1241 is disconnected and the system switches to generator mode.

[0127] The above solution enables the diesel generator set and AC shore power to share a rectifier connected to the DC busbar 121, meeting the need for the ship 10 to use AC shore power 1231 for onboard charging in the later stage, achieving the safety and economy of power switching, while reducing the equipment installation space and weight and improving the flexibility of charging.

[0128] The present application also provides a computer-readable storage medium having computer instructions stored thereon, which, when executed by a processor, implement the power switching method described in any embodiment of the present application. As an example, the processor may be the first control unit 1242a described above. The computer-readable storage medium may be a phase change memory (PRAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), other types of random access memory (RAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a flash memory or other memory technology, a compact disc read-only memory (CD-ROM), a digital versatile disc (DVD) or other optical storage, a magnetic cassette, a magnetic tape, a magnetic disk storage or other magnetic storage device, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.

[0129] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. The terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0130] The above is a detailed introduction to the methods and devices provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the methods and core ideas of the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A marine power system, It is characterized in that The ship power system includes a DC busbar, a rectifier component and a power switching device, the input end of the rectifier component is connected to the output end of the power switching device, the output end of the rectifier component is connected to the DC busbar, and the input end of the power switching device is connected to at least two AC power supplies.

2. The marine power system according to claim 1, It is characterized in that The power switching device includes a multi-way switch circuit, each of which is connected between the rectifier component and one of the AC power sources, and any two of the multi-way switch circuits are mutually exclusive.

3. The marine power system according to claim 2, It is characterized in that Each of the switch circuits includes a relay, and the relay includes a main contactor, a normally open contact, and a normally closed contact; The main contactor of the relay of each switch circuit is connected to the normally open contact of the relay of the switch circuit and the normally closed contacts of the relays of the remaining switch circuits.

4. The marine power system according to claim 3, It is characterized in that Each of the relays includes at least two normally open contacts, one of the normally open contacts of the relay of each switch circuit is used to connect to the normally closed contacts of the relays of the remaining switch circuits, and the remaining normally open contacts are used to connect the rectifier assembly and the AC power supply.

5. The marine power system according to claim 4, It is characterized in that Two ends of each of the remaining normally open contacts are used to connect the rectifier component and the AC power supply respectively.

6. The marine power system according to claim 4, It is characterized in that The marine power system further comprises a circuit breaker, wherein the circuit breaker is used to connect the rectifier assembly and the AC power supply, and the remaining normally open contacts are used to connect the circuit breaker.

7. The marine power system according to claim 2, It is characterized in that The marine power system further comprises a plurality of switch components, each of which is connected to a corresponding switch circuit to conduct the switch circuit when closed.

8. The marine power system according to claim 7, It is characterized in that The switch assembly comprises a local switch unit, one end of which is connected to a corresponding switch loop, and the other end of which is connected to a local DC power supply.

9. The marine power system according to claim 8, It is characterized in that The ship power system further comprises a DC conversion component, an input end of the DC conversion component is connected to the DC busbar, and an output end of the DC conversion component is connected to the local switch unit.

10. The marine power system according to claim 8, It is characterized in that The switch assembly comprises a remote switch unit, one end of which is connected to a corresponding switch circuit, and the other end of which is connected to a remote DC power supply.

11. The marine power system according to claim 10, It is characterized in that The marine power system further includes a switching element connected to the plurality of switch assemblies, and the switching element is used for selecting a corresponding switch circuit to be controlled based on the local switch unit or the remote switch unit.

12. The marine power system according to claim 11, It is characterized in that The switching element is connected to a plurality of the local switch units; When the switching element is activated, controlling the corresponding switch circuit based on the local switch unit; When the switching element is not activated, the corresponding switch circuit is controlled based on the remote switch unit.

13. The marine power system according to any one of claims 1 to 12, It is characterized in that The AC power source includes a single-phase AC power source or a three-phase AC power source.

14. The marine power system according to claim 13, It is characterized in that The at least two AC power sources include an AC generator and AC shore power.

15. The marine power system according to claim 1, It is characterized in that The marine power system further comprises a pre-charging control device, a battery, a component to be pre-charged and a power-on self-starting device, wherein the battery supplies power to the component to be pre-charged via the DC busbar; The pre-filling control device comprises: A switch unit, the switch unit being connected between the battery and the power-on self-starting device; a trigger unit, the trigger unit being connected to the switch unit; Before the pre-charging of the pre-charged component is completed, the trigger unit is in a non-triggering state, so that the switch unit is in an off state to disconnect the power supply circuit between the battery and the power-on self-starting device; When the pre-charging of the pre-charged component is completed, the trigger unit is in a triggering state, so that the switch unit is in a closed state to conduct the power supply circuit between the battery and the power-on self-starting device.

16. The marine power system according to claim 15, It is characterized in that If the battery power-on time does not reach the preset time, the trigger unit is in the non-trigger state; If the battery power-on time reaches the preset time, the trigger unit is in the trigger state.

17. The marine power system according to claim 16, It is characterized in that The trigger unit includes a delay element, and the switch unit includes a first switch element; The two ends of the delay element are respectively connected to the positive output end and the negative output end of the battery, one end of the first switch element is connected to one end of the delay element connected to the positive output end of the battery, and the other end of the first switch element is connected to the positive input end of the power-on self-starting device.

18. The marine power system according to claim 16, It is characterized in that The trigger unit includes a delay element and a magnetic element, and the switch unit includes a first switch element and a second switch element; The two ends of the delay element are respectively connected to the positive output end and the negative output end of the battery, one end of the first switch element is connected to one end of the delay element connected to the positive output end of the battery, the other end of the first switch element is connected to one end of the magnetic element, the other end of the magnetic element is connected to the negative output end of the battery, and the second switch element is connected between the battery and the power-on self-starting device.

19. The marine power system according to claim 18, It is characterized in that The second switch element includes at least one of the following: A second switch element connected between the positive output terminal of the battery and the positive input terminal of the power-on self-starting device; A second switch element is connected between the negative output terminal of the battery and the negative input terminal of the power-on self-starting device.

20. The marine power system according to any one of claims 15 to 19, It is characterized in that The pre-filling control device also includes: At least one current limiting element connected between the battery and the power-on self-starting device is used to limit the current of the power supply circuit when the power supply circuit is turned on.

21. The marine power system according to claim 20, It is characterized in that The at least one current limiting element includes a fuse or an air switch.

22. The marine power system according to claim 15, It is characterized in that The trigger unit is used for: Obtaining pre-charging information of the component to be pre-charged; In response to the pre-charging information, the trigger state or the non-trigger state is in the trigger state, and the pre-charging information is used to indicate whether the component to be pre-charged has completed pre-charging; When in the non-trigger state, sending a disconnection instruction to the switch unit to control the switch unit to disconnect; When in the trigger state, a closing instruction is sent to the switch unit to control the switch unit to close.

23. The marine power system according to claim 22, It is characterized in that The trigger unit is used to obtain the pre-charging information from the battery or the component to be pre-charged.

24. The marine power system according to claim 18, It is characterized in that The trigger unit includes a first control unit and a second control unit, the first control unit is connected to the battery and the component to be pre-charged, and the second control unit is connected to the battery; The first control unit is used to obtain the pre-charging information from the battery or the component to be pre-charged; The second control unit is used to obtain the pre-charge information from the battery.

25. The marine power system according to claim 22, It is characterized in that The trigger unit includes a first control unit and a second control unit, the first control unit is connected to the battery and the component to be pre-charged, and the second control unit is connected to the battery; When the first control unit is in a normal working state, the first control unit is used to send the opening instruction or the closing instruction to the switch unit; When the first control unit is in an abnormal working state, the second control unit is used to send the opening instruction or the closing instruction to the switch unit.

26. The marine power system according to claim 25, It is characterized in that The second control unit confirms that the first control unit is in the abnormal working state when the communication between the second control unit and the first control unit is disconnected; and / or When the switch unit disconnects its communication with the first control unit, it confirms that the first control unit is in the abnormal working state, and the second control unit receives the signal sent by the switch unit indicating that the first control unit is in the abnormal working state.

27. A marine power system according to any one of claims 24 to 26, It is characterized in that The first control unit is a power and energy management system, and the second control unit is a battery management system of the battery.

28. The marine power system according to claim 22, It is characterized in that The trigger unit is also used for: receiving a state signal sent by the switch unit, wherein the state signal is used to indicate that the switch unit is in the open state or the closed state; The state signal is sent to a display unit, so that the display unit displays the state of the switch unit based on the state signal.

29. The marine power system according to claim 15, It is characterized in that After the battery is powered off, the trigger unit is in the non-trigger state, so that the switch unit is in the disconnected state to disconnect the power supply circuit.

30. The marine power system according to claim 1, It is characterized in that The marine power system further comprises a first control unit connected to the power switching device, wherein the first control unit is configured to: In response to the power supply mode switching instruction, determining a target power supply mode of the ship, where different power supply modes match different AC power sources; The power switching device is controlled to switch the current AC power of the ship to a target AC power matching the target power supply mode.

31. The marine power system according to claim 30, It is characterized in that The at least two AC power sources include an AC generator and an AC shore power source; the first control unit is used for: When the target power supply mode is a first power supply mode that matches the AC generator, the current AC power source of the ship is switched from the AC shore power to the AC generator.

32. The marine power system according to claim 31, It is characterized in that The marine power system further includes a battery connected to the DC busbar; the first control unit is used for: Controlling the battery to start supplying power; After the battery starts supplying power, controlling the AC shore power to stop supplying power; After the AC shore power stops supplying power, the AC generator is controlled to start supplying power.

33. The marine power system according to claim 32, It is characterized in that The first control unit is used for: Determining whether the alternating current output by the alternator is stable; If so, the AC generator is controlled to start supplying power.

34. The marine power system according to claim 33, It is characterized in that The first control unit is used for: If the AC power output by the AC generator is unstable, the AC power output by the AC generator is adjusted, and the process returns to the step of determining whether the AC power output by the AC generator is stable.

35. The marine power system according to claim 30, It is characterized in that The at least two AC power sources include an AC generator and an AC shore power source; the first control unit is used for: When the target power supply mode is a second power supply mode matching the AC shore power, the current AC power supply of the ship is switched from the AC generator to the AC shore power.

36. The marine power system according to claim 35, It is characterized in that The first control unit is used for: determining whether the AC generator is in a power supply state; If the AC generator is not in the power supply state, the AC shore power supply is controlled.

37. The marine power system according to claim 36, It is characterized in that The first control unit is used for: If the AC generator is in the power supply state, controlling the AC generator to stop supplying power; After the AC generator stops supplying power, the current AC power source of the ship is switched to the AC shore power.

38. The marine power system according to claim 37, It is characterized in that The first control unit is used for: After controlling the alternator to stop supplying power, confirming whether a switch circuit between the alternator and the rectifier assembly is disconnected; If not, return to the step of controlling the AC generator to stop supplying power.

39. The marine power system according to claim 30, It is characterized in that The target AC power source is used to charge the battery on the ship; and the first control unit is used to: Obtaining the remaining power of the battery; A charging current of the target AC power source for charging the battery is controlled based on the remaining power.

40. The marine power system according to claim 39, It is characterized in that The first control unit is used for: If the remaining power is less than a first preset power, controlling the target AC power source to charge the battery with a first charging current; If the residual current is greater than or equal to the first preset power, controlling the target AC power source to charge the battery with a second charging current; Wherein, the first charging current is greater than the second charging current.

41. The marine power system according to claim 40, It is characterized in that The first control unit is used for: If the remaining power is greater than a second preset power, the target AC power source is controlled to charge the battery with a third charging current; the third charging current is less than the second charging current, and the second preset power is greater than the first preset power.

42. A ship, It is characterized in that Said vessels include: the entity; and The ship power system according to any one of claims 1 to 41, wherein the ship power system is installed on the main body.

43. A power switching method, It is characterized in that For a marine power system according to any one of claims 1 to 29; the power switching method comprises: In response to the power supply mode switching instruction, the target power supply mode of the ship is determined, and different power supply modes are associated with different AC power sources. match; The current AC power supply of the ship is switched to a target AC power supply matching the target power supply mode.

44. The power switching method according to claim 43, It is characterized in that The at least two AC power sources include an AC generator and an AC shore power source; the step of switching the current AC power source of the ship to a target AC power source matching the target power supply mode includes: When the target power supply mode is a first power supply mode that matches the AC generator, the current AC power source of the ship is switched from the AC shore power to the AC generator.

45. The power switching method according to claim 44, It is characterized in that The ship power system further includes a battery connected to the DC busbar; the switching of the current AC power supply of the ship from the AC shore power to the AC generator includes: Controlling the battery to start supplying power; After the battery starts supplying power, controlling the AC shore power to stop supplying power; After the AC shore power stops supplying power, the AC generator is controlled to start supplying power.

46. ​​The power switching method according to claim 45, It is characterized in that The controlling the AC generator to start supplying power comprises: Determining whether the alternating current output by the alternator is stable; If so, the AC generator is controlled to start supplying power.

47. The power switching method according to claim 46, It is characterized in that The power switching method further includes: If the AC power output by the AC generator is unstable, the AC power output by the AC generator is adjusted, and the process returns to the step of determining whether the AC power output by the AC generator is stable.

48. The power switching method according to claim 43, It is characterized in that The at least two AC power sources include an AC generator and an AC shore power source; the switching of the current AC power source of the ship to a target AC power source matching the target power supply mode includes: When the target power supply mode is a second power supply mode matching the AC shore power, the current AC power supply of the ship is switched from the AC generator to the AC shore power.

49. The power switching method according to claim 48, It is characterized in that The step of switching the current AC power supply of the ship from the AC generator to the AC shore power comprises: determining whether the AC generator is in a power supply state; If the AC generator is not in the power supply state, the AC shore power supply is controlled.

50. The power switching method according to claim 49, It is characterized in that The step of switching the current AC power supply of the ship from the AC generator to the AC shore power further includes: If the AC generator is in the power supply state, controlling the AC generator to stop supplying power; After the AC generator stops supplying power, the current AC power source of the ship is switched to the AC shore power.

51. The power switching method according to claim 50, It is characterized in that The power switching method further includes: After controlling the alternator to stop supplying power, confirming whether a switch circuit between the alternator and the rectifier assembly is disconnected; If not, return to the step of controlling the AC generator to stop supplying power.

52. The power switching method according to claim 43, It is characterized in that The target AC power source is used to charge the battery on the ship; the power switching method also includes: Obtaining the remaining power of the battery; A charging current of the target AC power source for charging the battery is controlled based on the remaining power.

53. The power switching method according to claim 52, It is characterized in that The controlling the charging current of the target AC power source to charge the battery based on the remaining power includes: If the remaining power is less than a first preset power, controlling the target AC power source to charge the battery with a first charging current; If the residual current is greater than or equal to the first preset power, controlling the target AC power source to charge the battery with a second charging current; Wherein, the first charging current is greater than the second charging current.

54. The power switching method according to claim 53, It is characterized in that The controlling the charging current of the target AC power source to charge the battery based on the remaining power also includes: If the remaining power is greater than a second preset power, the target AC power source is controlled to charge the battery with a third charging current; the third charging current is less than the second charging current, and the second preset power is greater than the first preset power.

55. A computer readable storage medium, It is characterized in that Computer instructions are stored thereon, and when the computer instructions are executed by a processor, the power switching method described in any one of claims 43 to 54 is implemented.

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