Control method and device of ship power system

Abstract

The invention relates to the technical field of ship power systems, and provides a control method and device of a ship power system.The ship power system comprises a fuel cell and a storage battery, the fuel cell and the storage battery are connected to a direct-current bus through corresponding first converters, and the direct-current bus is connected to a plurality of electric devices through a plurality of second converters. The method comprises the following steps: acquiring a current demand load according to load adjustment instructions received by a plurality of electric devices at the current moment; the SOC of the storage battery at the current moment is obtained; judging whether the change state of the current demand load relative to the historical actual load before executing the load adjusting instruction is increased or decreased; and controlling the operation of the fuel cell and the storage battery according to the change state and the SOC until the real-time output load of the fuel cell is stabilized as the current demand load, or the plurality of electric equipment receives a new load regulation instruction. According to the invention, the advantages of the fuel cell can be brought into full play, and better power performance can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of ship power systems, and in particular to a control method and device for a ship power system. Background Art

[0002] In the context of energy conservation and environmental protection being widely valued, clean energy is increasingly being used in ship power systems. Fuel cells have become an ideal clean energy source for ships due to their high efficiency, low radiation, and high reliability.

[0003] Compared with traditional batteries, fuel cells have advantages such as long driving range, fast energy replenishment, more environmental protection and long service life. However, the output characteristics of fuel cells are completely different from those of traditional batteries. Batteries can respond to demand loads quickly, and their output can be increased or decreased to the target load instantly, while the output load of fuel cells must be increased or decreased slowly and cannot respond to demand loads immediately. Therefore, in the hybrid power system of ships equipped with fuel cells and batteries, how to give full play to the advantages of fuel cells and achieve better power performance is a technical problem that urgently needs to be solved. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a control method and device for a ship power system, which can control the fuel cell and the battery to work together according to the changing state of the required load, thereby fully exerting the advantages of the fuel cell and achieving better power performance.

[0005] The technical solution adopted by the present invention is as follows: A control method for a ship power system, the ship power system is a hybrid power system including a fuel cell and a battery, the fuel cell and the battery are respectively connected to a DC bus through corresponding first converters, and the DC bus is respectively connected to corresponding multiple electrical devices through multiple second converters, the method comprising the following steps: S1, obtaining a current demand load according to a load adjustment instruction received by the multiple electrical devices at the current moment; S2, obtaining the SOC (State of Charge) of the battery at the current moment; S3, judging whether the change state of the current demand load relative to the historical actual load before the load adjustment instruction is executed is an increase or decrease; S4, controlling the operation of the fuel cell and the battery according to the change state and the SOC until the real-time output load of the fuel cell is stabilized to the current demand load, or the multiple electrical devices receive a new load adjustment instruction.

[0006] The fuel cell and the battery are controlled according to the change state and the SOC, specifically including: if the change state is increasing and the SOC is greater than a first preset value, then from the current moment, the fuel cell is controlled to operate with the parameters corresponding to the current demand load, and the battery is controlled to discharge with a first load difference, wherein the first load difference is the difference between the current demand load and the real-time output load of the fuel cell; if the change state is increasing and the SOC is less than or equal to the first preset value, then from the current moment, the fuel cell is controlled to operate with m times the parameters corresponding to the current demand load, and when the real-time output load of the fuel cell rises to the current demand load, the fuel cell is restored to operate at the current load. The fuel cell is operated at the parameters corresponding to the previous demand load, wherein m>1; if the change state is decreasing, and the SOC is less than a second preset value, then from the current moment, the fuel cell is controlled to operate at the parameters corresponding to the demand load, and the battery is controlled to charge at a second load difference, wherein the second load difference is the difference between the real-time output load of the fuel cell and the current demand load; if the change state is decreasing, and the SOC is greater than or equal to the second preset value, then from the current moment, the fuel cell is controlled to operate at n times the parameters corresponding to the current demand load, and when the real-time output load of the fuel cell drops to the current demand load, the fuel cell is restored to operate at the parameters corresponding to the current demand load, wherein 0<n<1.

[0007] The parameters of the fuel cell include the flow rate and pressure of air and the flow rate of fuel.

[0008] Wherein, the parameter control component of the fuel cell is powered by the battery.

[0009] If the plurality of electrical devices receive a new load adjustment instruction, the process returns to step S1.

[0010] A control device for a ship power system, the ship power system is a hybrid power system including a fuel cell and a battery, the fuel cell and the battery are respectively connected to a DC bus through corresponding first converters, and the DC bus is respectively connected to corresponding multiple electrical devices through multiple second converters, the device comprises: a first acquisition module, the first acquisition module is used to acquire a current demand load according to a load adjustment instruction received by the multiple electrical devices at the current moment; a second acquisition module, the second acquisition module is used to acquire the SOC of the battery at the current moment; a judgment module, the judgment module is used to judge whether the change state of the current demand load relative to the historical actual load before the execution of the load adjustment instruction is increased or decreased; a control module, the control module is used to control the operation of the fuel cell and the battery according to the change state and the SOC until the real-time output load of the fuel cell is stabilized to the current demand load, or the multiple electrical devices receive a new load adjustment instruction.

[0011] The control module is specifically used for: when the change state is increasing and the SOC is greater than a first preset value, from the current moment, controlling the fuel cell to operate with the parameters corresponding to the current demand load, and controlling the battery to discharge with a first load difference, wherein the first load difference is the difference between the current demand load and the real-time output load of the fuel cell; when the change state is increasing and the SOC is less than or equal to the first preset value, from the current moment, controlling the fuel cell to operate with m times the parameters corresponding to the current demand load, and when the real-time output load of the fuel cell rises to the current demand load, restoring the fuel cell to operate with the parameters corresponding to the current demand load, Wherein, m>1; when the change state is decreasing, and the SOC is less than a second preset value, from the current moment, the fuel cell is controlled to operate with parameters corresponding to the demand load, and the battery is controlled to charge with a second load difference, wherein the second load difference is the difference between the real-time output load of the fuel cell and the current demand load; when the change state is decreasing, and the SOC is greater than or equal to the second preset value, from the current moment, the fuel cell is controlled to operate with n times the parameters corresponding to the current demand load, and when the real-time output load of the fuel cell drops to the current demand load, the fuel cell is restored to operate with parameters corresponding to the current demand load, wherein, 0<n<1.

[0012] The parameters of the fuel cell include the flow rate and pressure of air and the flow rate of fuel.

[0013] Wherein, the parameter control component of the fuel cell is powered by the battery.

[0014] When the plurality of electrical devices receive a new load adjustment instruction, the first acquisition module acquires a new current required load according to the new load adjustment instruction received by the plurality of electrical devices.

[0015] Beneficial effects of the present invention: The present invention first obtains the current demand load according to the load adjustment instructions received by multiple electrical devices at the current moment, and obtains the SOC of the battery at the current moment, and then controls the operation of the fuel cell and the battery according to the changing state of whether the current demand load increases or decreases and the SOC. In this way, the fuel cell and the battery can be controlled to work together according to the changing state of the demand load, which can fully exert the advantages of the fuel cell and achieve better power performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a ship power system according to an embodiment of the present invention; Figure 2 A flow chart of a control method for a ship power system according to an embodiment of the present invention; Figure 3 The present invention is a block diagram of a control device for a ship power system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figure 1 As shown, a ship power system of an embodiment of the present invention is a hybrid power system including a fuel cell and a battery, wherein the fuel cell and the battery are respectively connected to a DC bus through corresponding first converters, and the DC bus is respectively connected to corresponding multiple electrical devices through multiple second converters. Among them, the first converter may be a DC / DC converter, and the second converter may be a DC / AC converter. The multiple electrical devices may include a propulsion motor M and other electrical appliances, and a transformer T may be connected between the other electrical appliances and the second converter. The other electrical appliances may include lamps, household appliances, communication equipment, computers, etc. In addition, the DC bus may also be connected to a shore power supply through a shore power socket so as to be powered and charged by shore power.

[0019] In a specific embodiment of the present invention, the fuel cell may be a hydrogen fuel cell, and the storage battery may be a lithium battery.

[0020] like Figure 2As shown, the control method of the ship power system of the embodiment of the present invention includes the following steps: S1, obtaining the current demand load according to the load adjustment instructions currently received by multiple electrical devices.

[0021] In an embodiment of the present invention, the load adjustment instructions of each power-consuming device can be monitored in real time, and when it is detected that at least one power-consuming device has received the load adjustment instruction, the current required load of the ship power system can be obtained. The ship power system refers to a system composed of the power-consuming devices powered by the above-mentioned fuel cells and batteries.

[0022] In the embodiment of the present invention, the load adjustment instruction refers to any instruction that can affect the power load of the ship's power system, such as the speed adjustment instruction of the propulsion motor, the switch instruction of a certain household appliance, the brightness adjustment instruction of a certain lamp, etc. At the current moment, if any of the multiple power-consuming devices receives the load adjustment instruction, it means that the demand load of the ship's power system at the current moment has changed, or there is a new load demand at the current moment. At the current moment, the power load that can maintain all power-consuming devices to reach the target state is the current demand load.

[0023] S2, obtaining the SOC of the battery at the current moment.

[0024] In one embodiment of the present invention, if there are multiple batteries working together, that is, the batteries are in the form of a group consisting of multiple single batteries, then the SOC obtained here is the SOC of the group.

[0025] S3, determining whether the current demand load is increasing or decreasing relative to the historical actual load before the load adjustment instruction is executed.

[0026] In one embodiment of the present invention, the actual load of the ship power system may be collected in real time, and the historical actual load may be the actual load collected at a moment before the current moment.

[0027] Generally, when there is a load adjustment instruction for one or some electrical equipment, the electrical load of the ship's electrical system will either increase or decrease. If a special situation occurs, such as the electrical load to be increased by one electrical equipment happens to offset the electrical load to be reduced by another electrical equipment, resulting in the current demand load remaining unchanged, the subsequent steps will not be executed, and the load adjustment instructions of each electrical equipment will continue to be monitored.

[0028] S4, controlling the operation of the fuel cell and the battery according to the change state and SOC until the real-time output load of the fuel cell is stabilized to the current demand load, or multiple power-consuming devices receive new load adjustment instructions.

[0029] Specifically, if the change state is increase, and the SOC is greater than the first preset value, then from the current moment on, the fuel cell is controlled to operate with parameters corresponding to the current demand load, and the battery is controlled to discharge with a first load difference, wherein the first load difference is the difference between the current demand load and the real-time output load of the fuel cell.

[0030] If the change state is increase, and the SOC is less than or equal to the first preset value, then from the current moment on, the fuel cell is controlled to operate at m times the parameters corresponding to the current demand load, and when the real-time output load of the fuel cell rises to the current demand load, the fuel cell is restored to operate at the parameters corresponding to the current demand load, where m>1.

[0031] If the change state is decreasing, and the SOC is less than the second preset value, then from the current moment on, the fuel cell is controlled to operate with parameters corresponding to the required load, and the battery is controlled to charge with the second load difference, wherein the second load difference is the difference between the real-time output load of the fuel cell and the current required load.

[0032] If the change state is decreasing, and the SOC is greater than or equal to the second preset value, then from the current moment on, the fuel cell is controlled to operate at n times the parameters corresponding to the current demand load, and when the real-time output load of the fuel cell drops to the current demand load, the fuel cell is restored to operate at the parameters corresponding to the current demand load, where 0<n<1.

[0033] In one embodiment of the present invention, the first preset value is a value close to 0, and the SOC is the first preset value or less than the first preset value, indicating that the battery is about to run out of power or is out of power. Alternatively, in one embodiment of the present invention, the first preset value is the lower discharge limit SOC of the battery.

[0034] In one embodiment of the present invention, the second preset value is a value close to 1, and the SOC is the second preset value or greater than the second preset value, indicating that the battery is about to be fully charged or fully charged. Alternatively, in one embodiment of the present invention, the second preset value is the upper limit SOC of the battery charge.

[0035] In one embodiment of the present invention, there are multiple parameters of the controlled fuel cell, which may include the flow rate and pressure of air and the fuel flow rate. For a hydrogen fuel cell, the fuel flow rate is the hydrogen flow rate. The correspondence between the load and the parameters of the fuel cell refers to the correspondence between the stable output load and the stable parameters of the fuel cell obtained in advance through experiments under the stable working state of the fuel cell. According to the current required load, the load-parameter correspondence can be directly called to obtain the corresponding parameters.

[0036] When the fuel cell is controlled to operate with the parameters corresponding to the current demand load, and the battery is controlled to discharge with the first load difference, if the first load difference reaches 0, it means that the real-time output load of the fuel cell is equal to the current demand load, and the battery discharge stops. At this time, the battery stops working, and the fuel cell continues to operate. Since the corresponding loads under the current parameters are in a stable corresponding relationship, the real-time output load of the fuel cell will be continuously and stably equal to the current demand load. When the fuel cell is controlled to operate with the parameters corresponding to the demand load, and the battery is controlled to charge with the second load difference, if the second load difference reaches 0, it means that the real-time output load of the fuel cell is equal to the current demand load, and the battery charging stops. At this time, the battery stops working, and the fuel cell continues to operate. Since the corresponding loads under the current parameters are in a stable corresponding relationship, the real-time output load of the fuel cell will be continuously and stably equal to the current demand load.

[0037] When the current demand load increases and the battery cannot discharge, by controlling the fuel cell to operate with relatively large parameters, the speed of its output load increase can be significantly accelerated; when the current demand load decreases and the battery cannot be charged, by controlling the fuel cell to operate with relatively small parameters, the speed of its output load decrease can be significantly accelerated. As a result, when the battery cannot cooperate with related work, the demand load can be reached as quickly as possible to achieve better power performance. And through the timely recovery of parameters, it can be avoided that the parameters are continuously too large or too small, resulting in a mismatch between the actual load and the demand, and it can be avoided that the parameters are continuously too large or too small, resulting in energy loss or life loss of the fuel cell.

[0038] When the real-time output load of the fuel cell rises to the current demand load and the fuel cell is restored to operate with the parameters corresponding to the current demand load, due to the inertia of the chemical reaction in the fuel cell, there will be a period of time when the reaction conditions are relatively excessive, and the real-time output load of the fuel cell is greater than the current demand load. During this period, the battery can be controlled to charge with the difference between the real-time output load of the fuel cell and the current demand load until the real-time output load of the fuel cell is continuously and stably equal to the current demand load. When the real-time output load of the fuel cell drops to the current demand load and the fuel cell is restored to operate with the parameters corresponding to the current demand load, due to the inertia of the chemical reaction in the fuel cell, there will be a period of time when the reaction conditions are relatively insufficient, and the real-time output load of the fuel cell is less than the current demand load. During this period, the battery can be controlled to discharge with the difference between the current demand load and the real-time output load of the fuel cell until the real-time output load of the fuel cell is continuously and stably equal to the current demand load.

[0039] In one embodiment of the present invention, for parameters of multiple controlled fuel cells, m of different parameters may be the same or different; n of different parameters may be the same or different. For example, in a specific embodiment, when the change state is increasing, and the SOC is less than or equal to the first preset value, from the current moment, the fuel cell may be controlled to operate at 3 times the air flow rate, 3 times the fuel flow rate, and 2 times the air pressure corresponding to the current demand load. In a preferred embodiment of the present invention, m is greater than or equal to 2, and n is less than or equal to 1 / 2.

[0040] In one embodiment of the present invention, the control of each parameter of the fuel cell is achieved by controlling the corresponding parameter control component. Among them, the parameter control component of the air flow and pressure is an air compressor, and the parameter control component of the fuel flow is a fuel supply valve. In one embodiment of the present invention, the parameter control component of the fuel cell is powered by a battery. By supplying power to the parameter control component of the fuel cell through the battery, the consumption of the fuel cell's own energy by its own control can be avoided, thereby avoiding the resulting instability of the fuel cell output and ensuring the response speed and accuracy to the required load.

[0041] In one embodiment of the present invention, if a plurality of electrical devices receive a new load adjustment instruction, the process returns to step S1.

[0042] In summary, according to the control method of the ship power system of the embodiment of the present invention, the current demand load is first obtained according to the load adjustment instructions received by multiple electrical equipment at the current moment, and the SOC of the battery at the current moment is obtained, and then the operation of the fuel cell and the battery is controlled according to the changing state of whether the current demand load increases or decreases and the SOC. In this way, the fuel cell and the battery can be controlled to work together according to the changing state of the demand load, which can not only give full play to the advantages of the fuel cell, but also achieve better power performance.

[0043] Corresponding to the control method of the ship power system of the above embodiment, the present invention also proposes a control device of the ship power system.

[0044] like Figure 3As shown, the control device of the ship power system of the embodiment of the present invention includes a first acquisition module 10, a second acquisition module 20, a judgment module 30 and a control module 40. Among them, the first acquisition module 10 is used to obtain the current demand load according to the load adjustment instruction received by multiple power-consuming devices at the current moment; the second acquisition module 20 is used to obtain the SOC of the battery at the current moment; the judgment module 30 is used to determine whether the change state of the current demand load relative to the historical actual load before the load adjustment instruction is executed is increased or decreased; the control module 40 is used to control the operation of the fuel cell and the battery according to the change state and SOC until the real-time output load of the fuel cell is stabilized to the current demand load, or multiple power-consuming devices receive new load adjustment instructions.

[0045] In an embodiment of the present invention, the first acquisition module 10 can monitor the load adjustment instructions of each power-consuming device in real time, and when it is detected that at least one power-consuming device has received the load adjustment instruction, the current required load of the ship power system can be obtained. The ship power system refers to a system composed of the power-consuming devices powered by the above-mentioned fuel cells and batteries.

[0046] In the embodiment of the present invention, the load adjustment instruction refers to any instruction that can affect the power load of the ship's power system, such as the speed adjustment instruction of the propulsion motor, the switch instruction of a certain household appliance, the brightness adjustment instruction of a certain lamp, etc. At the current moment, if any of the multiple power-consuming devices receives the load adjustment instruction, it means that the demand load of the ship's power system at the current moment has changed, or there is a new load demand at the current moment. At the current moment, the power load that can maintain all power-consuming devices to reach the target state is the current demand load.

[0047] In one embodiment of the present invention, if there are multiple batteries working together, that is, the batteries are in the form of a group consisting of multiple single batteries, the SOC acquired by the second acquisition module 20 is the SOC of the group.

[0048] In one embodiment of the present invention, the actual load of the ship power system may be collected in real time, and the historical actual load may be the actual load collected at a moment before the current moment.

[0049] Generally, when there is a load adjustment instruction for one or some electrical equipment, the electrical load of the ship electrical system will either increase or decrease. If a special situation occurs, such as the electrical load to be increased by one electrical equipment happens to offset the electrical load to be reduced by another electrical equipment, resulting in the judgment module 30 determining that the current required load remains unchanged, the control module 40 does not perform the following actions, and the first acquisition module 10 continues to monitor the load adjustment instructions of each electrical equipment.

[0050] The control module 40 is specifically used for: when the change state is increasing and the SOC is greater than a first preset value, from the current moment, controlling the fuel cell to operate with parameters corresponding to the current demand load, and controlling the battery to discharge with a first load difference, wherein the first load difference is the difference between the current demand load and the real-time output load of the fuel cell; when the change state is increasing and the SOC is less than or equal to the first preset value, from the current moment, controlling the fuel cell to operate with m times the parameters corresponding to the current demand load, and when the real-time output load of the fuel cell rises to the current demand load, restoring the fuel cell to operate with parameters corresponding to the current demand load, wherein In the embodiment, m>1; when the change state is decreasing, and the SOC is less than the second preset value, from the current moment, the fuel cell is controlled to operate with the parameters corresponding to the demand load, and the battery is controlled to charge with the second load difference, wherein the second load difference is the difference between the real-time output load of the fuel cell and the current demand load; when the change state is decreasing, and the SOC is greater than or equal to the second preset value, from the current moment, the fuel cell is controlled to operate with n times the parameters corresponding to the current demand load, and when the real-time output load of the fuel cell drops to the current demand load, the fuel cell is restored to operate with the parameters corresponding to the current demand load, wherein 0<n<1.

[0051] In one embodiment of the present invention, the first preset value is a value close to 0, and the SOC is the first preset value or less than the first preset value, indicating that the battery is about to run out of power or is out of power. Alternatively, in one embodiment of the present invention, the first preset value is the lower discharge limit SOC of the battery.

[0052] In one embodiment of the present invention, the second preset value is a value close to 1, and the SOC is the second preset value or greater than the second preset value, indicating that the battery is about to be fully charged or fully charged. Alternatively, in one embodiment of the present invention, the second preset value is the upper limit SOC of the battery charge.

[0053] In one embodiment of the present invention, there are multiple parameters of the controlled fuel cell, which may include the flow rate and pressure of air and the fuel flow rate. For a hydrogen fuel cell, the fuel flow rate is the hydrogen flow rate. The correspondence between the load and the parameters of the fuel cell refers to the correspondence between the stable output load and the stable parameters of the fuel cell obtained in advance through experiments under the stable working state of the fuel cell. According to the current required load, the load-parameter correspondence can be directly called to obtain the corresponding parameters.

[0054] When the fuel cell is controlled to operate with the parameters corresponding to the current demand load, and the battery is controlled to discharge with the first load difference, if the first load difference reaches 0, it means that the real-time output load of the fuel cell is equal to the current demand load, and the battery discharge stops. At this time, the battery stops working, and the fuel cell continues to operate. Since the corresponding loads under the current parameters are in a stable corresponding relationship, the real-time output load of the fuel cell will be continuously and stably equal to the current demand load. When the fuel cell is controlled to operate with the parameters corresponding to the demand load, and the battery is controlled to charge with the second load difference, if the second load difference reaches 0, it means that the real-time output load of the fuel cell is equal to the current demand load, and the battery charging stops. At this time, the battery stops working, and the fuel cell continues to operate. Since the corresponding loads under the current parameters are in a stable corresponding relationship, the real-time output load of the fuel cell will be continuously and stably equal to the current demand load.

[0055] When the current demand load increases and the battery cannot discharge, by controlling the fuel cell to operate with relatively large parameters, the speed of its output load increase can be significantly accelerated; when the current demand load decreases and the battery cannot be charged, by controlling the fuel cell to operate with relatively small parameters, the speed of its output load decrease can be significantly accelerated. As a result, when the battery cannot cooperate with related work, the demand load can be reached as quickly as possible to achieve better power performance. And through the timely recovery of parameters, it can be avoided that the parameters are continuously too large or too small, resulting in a mismatch between the actual load and the demand, and it can be avoided that the parameters are continuously too large or too small, resulting in energy loss or life loss of the fuel cell.

[0056] When the real-time output load of the fuel cell rises to the current demand load and the fuel cell is restored to operate with the parameters corresponding to the current demand load, due to the inertia of the chemical reaction in the fuel cell, there will be a period of time when the reaction conditions are relatively excessive, and the real-time output load of the fuel cell is greater than the current demand load. During this period, the battery can be controlled to charge with the difference between the real-time output load of the fuel cell and the current demand load until the real-time output load of the fuel cell is continuously and stably equal to the current demand load. When the real-time output load of the fuel cell drops to the current demand load and the fuel cell is restored to operate with the parameters corresponding to the current demand load, due to the inertia of the chemical reaction in the fuel cell, there will be a period of time when the reaction conditions are relatively insufficient, and the real-time output load of the fuel cell is less than the current demand load. During this period, the battery can be controlled to discharge with the difference between the current demand load and the real-time output load of the fuel cell until the real-time output load of the fuel cell is continuously and stably equal to the current demand load.

[0057] In one embodiment of the present invention, for parameters of multiple controlled fuel cells, m of different parameters may be the same or different; n of different parameters may be the same or different. For example, in a specific embodiment, when the change state is increasing, and the SOC is less than or equal to the first preset value, from the current moment, the fuel cell may be controlled to operate at 3 times the air flow rate, 3 times the fuel flow rate, and 2 times the air pressure corresponding to the current demand load. In a preferred embodiment of the present invention, m is greater than or equal to 2, and n is less than or equal to 1 / 2.

[0058] In one embodiment of the present invention, the control of each parameter of the fuel cell is achieved by controlling the corresponding parameter control component. Among them, the parameter control component of the air flow and pressure is an air compressor, and the parameter control component of the fuel flow is a fuel supply valve. In one embodiment of the present invention, the parameter control component of the fuel cell is powered by a battery. By supplying power to the parameter control component of the fuel cell through the battery, the consumption of the fuel cell's own energy by its own control can be avoided, thereby avoiding the resulting instability of the fuel cell output and ensuring the response speed and accuracy to the required load.

[0059] In one embodiment of the present invention, when a plurality of electrical devices receive a new load adjustment instruction, the first acquisition module 10 acquires a new current required load according to the new load adjustment instruction received by the plurality of electrical devices.

[0060] In summary, according to the control device of the ship power system of the embodiment of the present invention, the current demand load is first obtained according to the load adjustment instructions received by multiple electrical equipment at the current moment, and the SOC of the battery at the current moment is obtained, and then the operation of the fuel cell and the battery is controlled according to the changing state of whether the current demand load increases or decreases and the SOC. In this way, the fuel cell and the battery can be controlled to work together according to the changing state of the demand load, which can not only give full play to the advantages of the fuel cell, but also achieve better power performance.

[0061] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0065] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0066] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0067] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0068] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0069] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0070] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A control method for a ship power system, characterized in that: The ship power system is a hybrid power system including a fuel cell and a battery, wherein the fuel cell and the battery are respectively connected to a DC bus through corresponding first converters, and the DC bus is respectively connected to corresponding multiple electrical devices through multiple second converters. The method comprises the following steps: S1, obtaining the current required load according to the load adjustment instructions currently received by the plurality of electrical devices; S2, obtaining the SOC of the battery at the current moment; S3, determining whether the current required load is increasing or decreasing relative to the historical actual load before executing the load adjustment instruction; S4, controlling the operation of the fuel cell and the battery according to the change state and the SOC until the real-time output load of the fuel cell stabilizes to the current demand load, or the plurality of electrical devices receive new load adjustment instructions.

2. The control method of a ship power system according to claim 1, characterized in that: Controlling the fuel cell and the battery according to the change state and the SOC specifically includes: If the change state is increasing, and the SOC is greater than a first preset value, then from the current moment, the fuel cell is controlled to operate with the parameters corresponding to the current required load, and the battery is controlled to discharge with a first load difference, wherein the first load difference is the difference between the current required load and the real-time output load of the fuel cell; If the change state is increasing, and the SOC is less than or equal to the first preset value, then from the current moment, the fuel cell is controlled to operate at m times the parameter corresponding to the current required load, and when the real-time output load of the fuel cell rises to the current required load, the fuel cell is restored to operate at the parameter corresponding to the current required load, wherein m>1; If the change state is a decrease, and the SOC is less than a second preset value, then from the current moment, the fuel cell is controlled to operate with parameters corresponding to the required load, and the battery is controlled to charge with a second load difference, wherein the second load difference is the difference between the real-time output load of the fuel cell and the current required load; If the change state is decreasing, and the SOC is greater than or equal to the second preset value, then from the current moment on, the fuel cell is controlled to operate at n times the parameters corresponding to the current demand load, and when the real-time output load of the fuel cell drops to the current demand load, the fuel cell is restored to operate at the parameters corresponding to the current demand load, where 0<n<1.

3. The control method of a ship power system according to claim 2, characterized in that: The parameters of the fuel cell include the flow rate and pressure of air and the flow rate of fuel.

4. The control method of a ship power system according to claim 3, characterized in that: in, The parameter control component of the fuel cell is powered by the battery.

5. The control method of a ship power system according to any one of claims 2 to 4, characterized in that: If the plurality of electrical devices receive a new load adjustment instruction, the process returns to step S1.

6. A control device for a ship power system, characterized in that: The ship power system is a hybrid power system including a fuel cell and a battery, wherein the fuel cell and the battery are respectively connected to a DC bus through corresponding first converters, and the DC bus is respectively connected to corresponding multiple electrical devices through multiple second converters. The device includes: A first acquisition module, the first acquisition module is used to obtain the current required load according to the load adjustment instructions currently received by the multiple electrical devices; A second acquisition module, the second acquisition module is used to acquire the SOC of the battery at a current moment; A judgment module, the judgment module is used to judge whether the change state of the current required load relative to the historical actual load before executing the load adjustment instruction is an increase or a decrease; A control module is used to control the operation of the fuel cell and the battery according to the changing state and the SOC until the real-time output load of the fuel cell stabilizes to the current demand load, or the multiple electrical devices receive new load adjustment instructions.

7. The control device of the ship power system according to claim 6, characterized in that: The control module is specifically used for: When the change state is increasing, and the SOC is greater than a first preset value, from the current moment, the fuel cell is controlled to operate with the parameters corresponding to the current required load, and the battery is controlled to discharge with a first load difference, wherein the first load difference is the difference between the current required load and the real-time output load of the fuel cell; When the change state is increasing, and the SOC is less than or equal to the first preset value, from the current moment, the fuel cell is controlled to operate at m times the parameter corresponding to the current required load, and when the real-time output load of the fuel cell rises to the current required load, the fuel cell is restored to operate at the parameter corresponding to the current required load, wherein m>1; When the change state is decreasing, and the SOC is less than a second preset value, from the current moment, the fuel cell is controlled to operate with parameters corresponding to the required load, and the storage battery is controlled to charge with a second load difference, wherein the second load difference is the difference between the real-time output load of the fuel cell and the current required load; When the change state is decreasing and the SOC is greater than or equal to the second preset value, from the current moment on, the fuel cell is controlled to operate at n times the parameters corresponding to the current demand load, and when the real-time output load of the fuel cell drops to the current demand load, the fuel cell is restored to operate at the parameters corresponding to the current demand load, wherein 0<n<1.

8. The control device for a ship power system according to claim 7, characterized in that: The parameters of the fuel cell include the flow rate and pressure of air and the flow rate of fuel.

9. The control device of the ship power system according to claim 8, characterized in that: in, The parameter control component of the fuel cell is powered by the battery.

10. The control device of a ship power system according to any one of claims 6 to 9, characterized in that: When the plurality of electrical devices receive a new load adjustment instruction, the first acquisition module acquires a new current required load according to the new load adjustment instruction received by the plurality of electrical devices.

Images