CN116161208A - Control method, device and system of marine hybrid power system and ship - Google Patents

Control method, device and system of marine hybrid power system and ship Download PDF

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Publication number
CN116161208A
CN116161208A CN202310008217.6A CN202310008217A CN116161208A CN 116161208 A CN116161208 A CN 116161208A CN 202310008217 A CN202310008217 A CN 202310008217A CN 116161208 A CN116161208 A CN 116161208A
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China
Prior art keywords
mode
power
lithium battery
methanol
battery pack
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CN202310008217.6A
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Chinese (zh)
Inventor
毛皇光
叶飞
马烁凯
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China Shipbuilding Power Engineering Institute Co Ltd
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China Shipbuilding Power Engineering Institute Co Ltd
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Priority to CN202310008217.6A priority Critical patent/CN116161208A/en
Publication of CN116161208A publication Critical patent/CN116161208A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/20—Use of propulsion power plant or units on vessels the vessels being powered by combinations of different types of propulsion units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/21—Control means for engine or transmission, specially adapted for use on marine vessels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/20—Use of propulsion power plant or units on vessels the vessels being powered by combinations of different types of propulsion units
    • B63H2021/202—Use of propulsion power plant or units on vessels the vessels being powered by combinations of different types of propulsion units of hybrid electric type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/21—Control means for engine or transmission, specially adapted for use on marine vessels
    • B63H2021/216—Control means for engine or transmission, specially adapted for use on marine vessels using electric control means

Abstract

The invention discloses a control method, a device and a system of a marine hybrid power system and a ship. The method comprises the following steps: judging the current required load power of the electric load and the self state of the lithium battery pack; if the current required load power is smaller than a first preset value and the self state of the lithium battery pack meets pure electric operation conditions, switching a power supply mode of the ship power grid into a pure electric mode, wherein the pure electric mode is to be powered by the lithium battery pack only; if the current load power is smaller than a second preset value and the pure methanol running condition is met, switching the power supply mode of the ship power grid into a pure methanol mode, wherein the pure methanol mode is to be supplied by a methanol generator set only; if the conditions are not met, the hybrid power system is switched to a hybrid mode for working, and the hybrid mode is to jointly supply power by the lithium battery pack and the methanol generator set. The technical scheme of the embodiment of the invention realizes the flexible adjustment of the output of each power source according to the load required by the ship, improves the running economy of the system and reduces the emission of pollutants.

Description

Control method, device and system of marine hybrid power system and ship
Technical Field
The invention relates to the technical field of ships, in particular to a control method, a device and a system of a marine hybrid power system and a ship.
Background
In recent years, energy conservation and emission reduction of ships have become important concerns in the ship industry. With the development of economic globalization and technological innovation, research on energy conservation and emission reduction technology in the ship industry is not easy. The new energy sources such as fuel cells, battery energy storage, wind energy, solar energy and the like are different from the traditional fossil energy sources and are widely applied to the land, and reference is provided for new energy application in the ship industry. As the emission reduction pressure of ships increases, the shipping industry also accelerates the search for clean fuel applications, methanol as a low-carbon conversion alternative fuel for the shipping industry has increasingly been called for, and battery energy storage has been widely used in recent years on new ships.
The prior art scheme generally adopts a diesel-methanol dual-fuel system or a methanol generator is singly used for providing power for a ship, however, the diesel engine still can cause a large amount of pollutant emission, and the methanol generator is singly used for being difficult to meet the requirement of cruising ability.
Disclosure of Invention
The invention provides a control method, a device and a system of a marine hybrid power system and a ship, which are used for flexibly adjusting the output of each power source according to required load, improving the running economy of the system and reducing pollutant emission.
According to an aspect of the present invention, there is provided a control method of a marine hybrid system, characterized in that the hybrid system includes: the system comprises a methanol generator set, a lithium battery set, an electric load and a ship power grid;
the control method includes an automatic operation mode in which:
judging the current required load power of the electric load and the self state of the lithium battery pack;
if the current required load power is smaller than a first preset value and the self state of the lithium battery pack meets the pure electric operation condition, switching the power supply mode of the ship power grid into a pure electric mode; wherein, the pure electric mode is to only supply power by the lithium battery pack;
if the current load power is smaller than a second preset value and the pure methanol running condition is met, switching the power supply mode of the ship power grid into a pure methanol mode; the pure methanol mode is to supply power only by a methanol generator set;
if the conditions are not met, switching to a mixed mode to work; the hybrid mode is to jointly supply power by the lithium battery pack and the methanol generator set.
Optionally, the number of the methanol power generating units is two, and the pure methanol mode comprises a first pure methanol mode and a second pure methanol mode;
specifically, if the current required load power is smaller than a third preset value and the pure methanol operation condition is met, switching to a first pure methanol mode for operation; the third preset value is smaller than the second preset value, and the first pure methanol mode is a group of methanol generator sets to work;
if the current required load power is larger than a third preset value and smaller than a second preset value and meets the pure methanol operation condition, switching to a second pure methanol mode for operation; wherein, the second pure methanol mode is the work of two groups of methanol generator sets.
Optionally, the number of the methanol generator sets is two, the number of the lithium battery sets is two, and the mixing mode comprises a first mixing mode, a second mixing mode, a third mixing mode and a fourth mixing mode;
specifically, if the current required load power is greater than a fourth preset value and less than a third preset value and the single lithium battery pack works abnormally, switching to a first mixed mode for working; the third preset value is smaller than the second preset value, and the first mixed mode is a mode that a group of methanol generator sets and a group of lithium battery sets work;
if the current required load power is larger than the third preset value and smaller than the sum of the fourth preset value and the third preset value, and the single-group lithium battery pack works abnormally, switching to a second mixed mode for working; the second mixed mode is that two methanol generator sets and one lithium battery set work;
if the current required load power is larger than the first preset value and smaller than the third preset value and the two groups of lithium battery packs work normally, switching to a third mixed mode for working; the third mixed mode is that a group of methanol generator sets and two groups of lithium battery packs work;
if the current required load power is larger than the third preset value and smaller than the sum of the second preset value and the first power and the two groups of lithium battery packs work normally, switching to a fourth mixed mode for working; the fourth mixed mode is that two methanol generator sets and two lithium battery sets work.
Optionally, the first power is rated power of the lithium battery pack, and the second power is rated power of the methanol generator set;
the first preset value is 0.8 times of the first power;
the second preset value is 2 times of second power;
the third preset value is 0.8 times of the second power;
the fourth preset value is 0.4 times the first power.
Optionally, the self state of the lithium battery pack includes: the on-line condition of the lithium battery pack and the charge state of the lithium battery pack;
the pure electric operating conditions include: the lithium battery pack is on the network, and the charge state of the lithium battery pack is larger than the first charge state;
the pure methanol operating conditions include: the lithium battery pack is not available or in an off-grid state.
Optionally, the control method further includes: a semi-automatic mode of operation;
in the semiautomatic operation mode, the starting, stopping and the like of the methanol generator set and the lithium battery pack are controlled by a control signal triggering device, the triggering of the control signal triggering device is controlled by an operator, the methanol generator set and the lithium battery pack are interlocked, and the hybrid power system can only work in a pure methanol mode or a pure methanol mode; when the hybrid power system fails, the automatic operation cannot be switched to the semi-automatic operation mode.
Optionally, the control method further includes: a manual mode of operation;
in a manual operation mode, the starting, stopping and the like of the methanol generator set and the lithium battery pack are controlled by a control signal triggering device, the triggering of the control signal triggering device is controlled by an operator, and the control signal triggering device is manually switched among a pure methanol mode, a pure methanol mode and a mixed operation mode according to the requirement; when a plurality of devices in the hybrid power system are in failure, the system is switched to a manual operation mode when the system cannot work normally.
According to another aspect of the present invention, there is provided a control device for a marine hybrid system, characterized in that the hybrid system includes: the system comprises a methanol generator set, a lithium battery set, an electric load and a ship power grid; the control device comprises an automatic operation module, and the automatic operation module comprises:
the state judging unit is used for judging the current required load power of the electric load and the self state of the lithium battery pack;
the pure electric operation unit is used for switching the power supply mode of the ship power grid into a pure electric mode when the current required load power is smaller than a first preset value and the self state of the lithium battery pack meets pure electric operation conditions; wherein, the pure electric mode is to only supply power by the lithium battery pack;
the pure methanol operation unit is used for switching the power supply mode of the ship power grid into a pure methanol mode when the current load power is smaller than a second preset value and the pure methanol operation condition is met; the pure methanol mode is to supply power only by a methanol generator set;
the hybrid operation unit is used for switching the power supply mode of the ship power grid into a hybrid mode when the conditions are not met; the hybrid mode is to jointly supply power by a methanol generator set and a lithium battery set.
According to another aspect of the present invention, there is provided a marine hybrid system, characterized by comprising: the system comprises a methanol generator set, a lithium battery set, an electric load, a ship power grid and a controller; the controller is configured to execute the marine hybrid power system control method according to the first aspect of the invention.
According to a further aspect of the invention there is provided a marine vessel, characterised in that the vessel comprises a marine hybrid system according to the third aspect of the invention.
According to the technical scheme of the embodiment of the invention, whether the current required load power and the self state of the lithium battery pack meet the running conditions of a pure electric mode or a pure methanol mode is judged according to the current required load power of the electric load and the self state of the lithium battery pack, if so, the ship power grid is controlled to be switched to the corresponding mode to work, if not, the ship power grid is controlled to be switched to the mixed mode to work, the traditional diesel generator set is replaced by the methanol generator set, and the methanol generator set and the lithium battery pack are supplied with power together, so that the output of each power source is flexibly regulated according to the required load of the ship, the running economy of the system is improved, and the pollutant emission is reduced.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a control method of a marine hybrid power system according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for controlling a marine hybrid power system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a control device of a marine hybrid power system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a marine hybrid power system according to an embodiment of the present invention.
In the figure:
the system comprises a methanol generator set 1, a lithium battery pack 2, a propulsion machine 3, a daily load 4, a 400V daily load 41, a 230V daily load 42, a heat dissipation fan 5, a propeller 6, an alternating current busbar 7, a screen-connection switch 8, a transformer 9, an isolating switch 10, an inverter 11, an automatic operation module 100, a state judging unit 101, a pure-methanol operation unit 102, a pure-methanol operation unit 103 and a mixed operation unit 104.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention provides a control method of a marine hybrid power system, which can be executed by a control device of the marine hybrid power system, and the device can be integrated in a controller of the marine hybrid power system. Fig. 1 is a flowchart of a control method of a marine hybrid power system according to an embodiment of the present invention, where the hybrid power system includes: the system comprises a methanol generator set, a lithium battery set, an electric load and a ship power grid; the embodiment is applicable to control of the hybrid power system in an automatic operation mode, and in the automatic operation mode, the hybrid power system can operate in a set mode according to preset of operators and automatically switch according to requirements. As shown in fig. 1, the control method includes:
s101, judging the current required load power of the electric load and the self state of the lithium battery pack.
Specifically, the current required load power, i.e. the total power required by the current electrical load of the vessel, wherein the electrical load comprises a propulsion motor, a daily load, etc. The self state of the lithium battery pack comprises the on-grid condition of the lithium battery pack and the charge state of the lithium battery pack, namely whether the lithium battery pack is connected with a ship power grid or not, if the lithium battery pack is connected with the ship power grid, the lithium battery pack is on-grid, and if the lithium battery pack is disconnected with the ship power grid, the lithium battery pack is off-grid; the state of charge of the lithium battery pack represents the remaining capacity of the lithium battery pack.
S102, if the current required load power is smaller than a first preset value and the self state of the lithium battery pack meets pure electric operation conditions, switching a power supply mode of a ship power grid into a pure electric mode; wherein, the pure electric mode is to be supplied by the lithium battery pack only.
The first preset value may be, for example, 0.8 times the first power Pn1, wherein the first power Pn1 is the rated power of the lithium battery pack. The pure electric operating conditions include: the lithium battery pack is on the network, and the charge state of the lithium battery pack is larger than the first charge state; the first state of charge may be set as needed, and the first state of charge may be a value of 40% for example. Specifically, when the current required load power is less than 0.8Pn1 and the lithium battery pack is on the grid and the charge state of the lithium battery pack is greater than 40%, the power supply mode of the ship power grid is switched to a pure electric mode, and the lithium battery pack only supplies power to the whole ship, so that the methanol generator set is stopped. If the pure electric operation condition is not met, the hybrid power system displays that the pure electric mode is unavailable and the switching of the pure electric mode cannot be realized. If the load of the whole ship is larger than the maximum power of the pure electric mode, the power supply mode of the ship power grid is not switched to the pure electric mode even if the pure electric operation condition is met. For example, the pure mode may be used to reduce pollutant emissions when entering and exiting ports.
S103, if the current load power is smaller than a second preset value and the pure methanol operation condition is met, switching the power supply mode of the ship power grid into a pure methanol mode; wherein, pure methanol mode is only supplied by the methanol generator set.
For example, the second preset value may be 2 times the second power Pn2, where the second power Pn2 is the rated power of the methanol power generator set. The pure methanol operating conditions include: the lithium battery pack is not available or in an off-grid state; among other things, the unavailability of the lithium battery may include the lithium battery being too low in charge or experiencing internal faults, such as communication faults, excessive temperatures, etc. Specifically, when the current load power is less than 2Pn2 and the lithium battery pack is unavailable or in an off-grid state, the power supply mode of the ship power grid is switched to a pure methanol mode, and only the methanol generator set supplies power. When the electric quantity of the lithium battery pack is too low or in an off-grid state, the methanol generator set bears the load of the whole ship, and the system automatically enters a pure methanol mode. Because the lithium battery pack has too low electric quantity or is in an off-grid state, i.e. the lithium battery pack is not available, the system can not be switched to a pure methanol mode or a mixed mode after entering the pure methanol mode.
S104, if the conditions are not met, switching to a mixed mode to work; the hybrid mode is to jointly supply power by the lithium battery pack and the methanol generator set.
Specifically, if the above conditions are not satisfied and the ship cannot operate in a pure electric mode or a pure methanol mode, the power supply mode of the ship power grid is switched to a hybrid mode for working, and the lithium battery pack and the methanol generator set supply power together. In an exemplary embodiment, when the electric quantity of the lithium battery is smaller than the first charge state or the load of the whole ship is larger than the maximum power of the pure electric mode, the hybrid power system is automatically switched to the hybrid mode, the methanol generator set is started, and the running mode is prompted to change, wherein the lithium battery set bears the load requirement outside the methanol generator set. For example, the hybrid mode can be adopted when the navigation is generally performed, so that the requirement of the cruising ability is met.
According to the technical scheme of the embodiment of the invention, whether the current required load power and the self state of the lithium battery pack meet the running conditions of a pure electric mode or a pure methanol mode is judged according to the current required load power of the electric load and the self state of the lithium battery pack, if so, the ship power grid is controlled to be switched to the corresponding mode to work, if not, the ship power grid is controlled to be switched to the mixed mode to work, the traditional diesel generator set is replaced by the methanol generator set, and the methanol generator set and the lithium battery pack are supplied with power together, so that the output of each power source is flexibly regulated according to the required load of the ship, the running economy of the system is improved, and the pollutant emission is reduced.
On the basis of the above embodiment, optionally, fig. 2 is a flowchart of another control method of a marine hybrid power system according to the embodiment of the present invention, where the number of methanol power generating sets is two, the number of lithium battery sets is two, the pure methanol mode includes a first pure methanol mode and a second pure methanol mode, and the hybrid mode includes a first hybrid mode, a second hybrid mode, a third hybrid mode and a fourth hybrid mode; referring to fig. 2, the control method includes:
s201, judging the current required load power of the electric load and the self state of the lithium battery pack.
S202, if the current required load power is smaller than a first preset value and the self state of the lithium battery pack meets pure electric operation conditions, switching a power supply mode of a ship power grid into a pure electric mode; wherein, the pure electric mode is to be supplied by the lithium battery pack only.
Specifically, when the number of lithium battery packs is two, the pure electric operation condition is that two lithium battery packs are on the net at the same time, and the charge state of the lithium battery packs is larger than the first charge state. And when the current required load power is smaller than 0.8 times of rated power of the lithium battery packs, and the states of charge of the two lithium battery packs are larger than 40% in the network at the same time, the power supply mode of the ship power grid is switched to a pure power mode, and only the two lithium battery packs supply power. Under normal conditions, the two lithium battery packs are put into operation, and only a single lithium battery pack is not allowed to be switched to a pure electric mode when in operation, so that the condition that the required load power is too high and the power supply of the single lithium battery pack is insufficient is avoided.
S203, switching to a first pure methanol mode for working if the current required load power is smaller than a third preset value and the pure methanol operation condition is met; the third preset value is smaller than the second preset value, and the first pure methanol mode is a group of methanol generator sets to work.
Specifically, the third preset value may be 0.8 times the second power Pn2, where the second power Pn2 is the rated power of the methanol power generator set. When the current required load power is less than 0.8Pn < 2 >, and the lithium battery pack is unavailable or in an off-grid state, the power supply mode of the ship power grid is switched to a first pure methanol mode, and a group of methanol generator sets supply power.
S204, if the current required load power is larger than a third preset value and smaller than 2 times of the second power and meets the pure methanol operation condition, switching to a second pure methanol mode for operation; wherein, the second pure methanol mode is the work of two groups of methanol generator sets.
Specifically, when 0.8Pn2 is less than the current required load power is less than 2Pn2, and the lithium battery pack is unavailable or in an off-grid state, the power supply mode of the ship power grid is switched to a second pure methanol mode, and two groups of methanol generator sets supply power.
S205, if the current required load power is larger than a fourth preset value and smaller than the third preset value and the single lithium battery pack works abnormally, switching to a first mixed mode for working; the third preset value is smaller than the second preset value, and the first mixed mode is a mode that a group of methanol generator sets and a group of lithium battery sets work.
Specifically, the fourth preset value may be 0.4 times the first power Pn1, where the first power Pn1 is the rated power of the lithium battery pack. The single lithium battery pack works abnormally, namely any one of the two lithium battery packs is unavailable or in an off-grid state. When 0.4Pn1 is less than the current required load power is less than 0.8Pn2, and the single lithium battery pack is unavailable or in an off-grid state, the power supply mode of the ship power grid is switched to a first mixed mode, and a methanol generator set and a lithium battery pack supply power together.
S206, if the current required load power is larger than a third preset value and smaller than the sum of a fourth preset value and the third preset value, and the single-group lithium battery pack works abnormally, switching to a second mixed mode for working; the second mixed mode is that two methanol generator sets and one lithium battery set work.
Specifically, when 0.8Pn2 is less than the current required load power is less than 0.4Pn1+0.8Pn2, and the single lithium battery pack is unavailable or in an off-grid state, the power supply mode of the ship power grid is switched to a second hybrid mode, and the two methanol power generator sets and the lithium battery pack supply power together.
S207, if the current required load power is larger than a first preset value and smaller than a third preset value and the two lithium battery packs work normally, switching to a third mixed mode for working; the third mixed mode is that a methanol generator set and two lithium battery packs work.
Specifically, the two lithium battery packs work normally, namely the two lithium battery packs are on the network at the same time, and the charge state of the lithium battery packs is larger than a low-power threshold value; the low battery threshold may be a 20% state of charge value. When the current required load power is more than 0.8Pn1 and less than 0.8Pn2, and the charge state of the two groups of lithium batteries is more than 20% on the net at the same time, the power supply mode of the ship power grid is switched to a third mixed power mode, and a group of methanol generator sets and the two groups of lithium batteries supply power together.
S208, if the current required load power is larger than a third preset value and smaller than the sum of the second preset value and the first power, and the two groups of lithium battery packs work normally, switching to a fourth mixed mode for working; the fourth mixed mode is that two methanol generator sets and two lithium battery sets work.
Specifically, when 0.8Pn2 is less than the current required load power is less than 2Pn2+Pn1, and the states of charge of the two groups of lithium batteries are larger than 20% in the network at the same time, the power supply mode of the ship power grid is switched to a fourth hybrid mode, and the two groups of methanol power generator sets and the two groups of lithium batteries are supplied with power together.
According to the technical scheme of the embodiment of the invention, whether the current required load power and the self state of the lithium battery pack meet the running conditions of a pure electric mode or a pure methanol mode is judged according to the current required load power of the electric load and the self state of the lithium battery pack, if so, the ship power grid is controlled to be switched to the corresponding mode to work, if not, the ship power grid is controlled to be switched to the mixed mode to work, the traditional diesel generator set is replaced by the methanol generator set, and the methanol generator set and the lithium battery pack are supplied with power together, so that the output of each power source is flexibly regulated according to the required load of the ship, the running economy of the system is improved, and the pollutant emission is reduced.
Optionally, the control method further comprises a semiautomatic operation mode, in which the starting, stopping and the like of the methanol generator set and the lithium battery pack are controlled by a control signal triggering device, the triggering of the control signal triggering device is controlled by an operator, the methanol generator set and the lithium battery pack are interlocked, and the hybrid power system can only work in a pure methanol mode or a pure methanol mode; when the hybrid power system fails, the automatic operation cannot be switched to the semi-automatic operation mode.
Specifically, when the hybrid power system fails and all the devices cannot be automatically controlled, the hybrid power system can still work normally, and can be switched to a semi-automatic operation mode. In the semiautomatic operation mode, the control signal triggering device can be a remote workstation, namely a total control system of each device can be controlled, and each device is controlled through the total control system. In the semi-automatic operation mode, an operator can manually send out a command through a remote workstation to control the methanol generator to operate under the artificial given fixed power, and can also control the charging or discharging of the lithium battery pack through the remote workstation, and the methanol generator pack is stopped or charges the lithium battery pack.
Specifically, the methanol generator set and the lithium battery set are interlocked, namely, when the methanol generator set works, the lithium battery set cannot work, and the same is true. Thus, in the semi-automatic mode of operation, the hybrid system can only operate in either the pure electric mode or the pure methanol mode. In an exemplary embodiment, when one of the two methanol power generating units and the two lithium battery packs fails, if the two methanol power generating units and the two lithium battery packs operate in the hybrid mode, when the currently used lithium battery pack has insufficient electric quantity, the other lithium battery pack needs to be switched to continue to operate, and as the other lithium battery pack fails and cannot be used, the other lithium battery pack cannot be automatically switched to continue to operate in the hybrid mode; and the same is true when the methanol generator set fails. Therefore, when any one methanol generator set or any one lithium battery set fails, the operation in the hybrid mode can cause the ship hybrid power system to provide unreliable power, so that the hybrid power system can only work in a pure methanol mode or a pure methanol mode in the semi-automatic operation mode.
Optionally, the control method further comprises a manual operation mode, in which the starting, stopping and the like of the methanol generator set and the lithium battery pack are controlled by a control signal triggering device, the triggering of the control signal triggering device is controlled by an operator, and the control signal triggering device is manually switched among a pure methanol mode, a pure methanol mode and a mixed mode according to the requirement; when a plurality of devices in the hybrid power system are in failure, the system is switched to a manual operation mode when the system cannot work normally.
Specifically, when a plurality of devices in the hybrid power system all fail and cannot work normally, the hybrid power system can be switched to a manual operation mode. In the manual operation mode, the control signal triggering device can be respective controllers of all the devices, and all the devices are controlled by the respective controllers. An operator can control the methanol generator set to operate under fixed power through the respective controller of the equipment, or control the starting and stopping of any lithium battery pack, and can manually control the starting or ending of charging when the lithium battery pack is charged. In the mixed mode, redundant power of the methanol generator set can be used for charging the lithium battery set, so that the high energy efficiency and economy of the whole ship are realized, and the energy is saved. In addition, the manual operation mode can be also suitable for the case of needing to debug the hybrid power system.
The embodiment of the invention also provides a control device of the marine hybrid power system, and fig. 3 is a schematic structural diagram of the control device of the marine hybrid power system, where the hybrid power system includes: the system comprises a methanol generator set, a lithium battery set, an electric load and a ship power grid; the device is suitable for the control method of the hybrid power system according to any embodiment of the invention. Referring to fig. 3, the apparatus includes an automatic operation module 100, and the automatic operation module 10 includes:
a state judging unit 101 for judging the current required load power of the electric load and the state of the lithium battery pack;
the pure electric operation unit 102 is configured to switch the power supply mode of the ship power grid to a pure electric mode when the current required load power is smaller than a first preset value and the self state of the lithium battery pack meets pure electric operation conditions; wherein, the pure electric mode is to only supply power by the lithium battery pack;
the pure methanol operation unit 103 is configured to switch the power supply mode of the ship power grid to a pure methanol mode when the current load power is smaller than a second preset value and the pure methanol operation condition is satisfied; the pure methanol mode is to supply power only by a methanol generator set;
the hybrid operation unit 104 is configured to switch the power supply mode of the ship power grid to a hybrid mode when the above conditions are not satisfied; the hybrid mode is to jointly supply power by a methanol generator set and a lithium battery set.
The embodiment of the invention also provides a marine hybrid power system, and fig. 4 is a schematic structural diagram of the marine hybrid power system provided by the embodiment of the invention, where the system includes: the system comprises a methanol generator set, a lithium battery set, an electric load, a ship power grid and a controller; the controller is configured to execute the hybrid system control method according to any embodiment of the present invention.
Specifically, the methanol power generator set 1 can be at least two groups, the lithium battery set 2 can be at least two groups, and the methanol power generator set 1 and the lithium battery set 2 are used for jointly supplying power to the electric load of the ship as power sources; the electrical loads may include a propulsion machine 3, a daily load 4, a heat dissipating fan 5, a propeller 6. The propulsion machine 3 is used for being connected with the propeller 6, and controlling the propeller 6 to act so as to provide thrust for the ship; the daily load 4 may include daily loads of different voltages, for example 400V daily load 41 and 230V daily load 42; the heat dissipation fan 5 is used for radiating heat for the daily load 4, and the heat dissipation fan 5 is arranged on two sides of a daily distribution board, and the daily distribution board is used for configuring electricity consumption of the daily load.
Illustratively, the marine hybrid power system further includes an ac busbar 7, where the ac busbar 7 may use 690V ac, and the ac busbar 7 is divided into left and right sections by a screen-connected switch 8, and the ac busbar 7 is used to provide a required voltage to the daily load 4 through a transformer 9. The methanol generator set 1, the lithium battery set 2 and the electric load are all connected with the alternating current busbar 7 through the isolating switch 10, and the lithium battery set 2 is also connected with the alternating current busbar 7 through the inverter 11; the disconnector 10 is used to disconnect individual devices, protecting the safety of the whole marine power grid.
According to the technical scheme, multiple power supply modes are realized by adopting two energy forms of the methanol generator set and the lithium battery pack, and the electric load is powered according to the required load power, so that the output of each power source is flexibly regulated according to the required load of a ship, the running economy of the system is improved, and the pollutant emission is reduced.
The embodiment of the invention also provides a ship, which comprises the hybrid power system according to any embodiment of the invention, and has corresponding functional modules and beneficial effects, and is not described herein.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. A method of controlling a marine hybrid system, the hybrid system comprising: the system comprises a methanol generator set, a lithium battery set, an electric load and a ship power grid;
the control method includes an automatic operation mode in which:
judging the current required load power of the electric load and the self state of the lithium battery pack;
if the current required load power is smaller than a first preset value and the self state of the lithium battery pack meets pure electric operation conditions, switching a power supply mode of the ship power grid into a pure electric mode; wherein the pure electric mode is powered by the lithium battery pack only;
if the current load power is smaller than a second preset value and the pure methanol running condition is met, switching the power supply mode of the ship power grid into a pure methanol mode; wherein, the pure methanol mode is to be powered by the methanol generator set only;
if the conditions are not met, switching to a mixed mode to work; the hybrid mode is to jointly supply power to the lithium battery pack and the methanol generator set.
2. The method of claim 1, wherein the number of methanol gensets is two, the pure methanol mode comprising a first pure methanol mode and a second pure methanol mode;
specifically, if the current required load power is smaller than a third preset value and the pure methanol operation condition is met, switching to the first pure methanol mode for operation; the third preset value is smaller than the second preset value, and the first pure methanol mode is a group of methanol generator sets to work;
if the current required load power is larger than the third preset value and smaller than the second preset value and meets the pure methanol operation condition, switching to the second pure methanol mode for operation; and the second pure methanol mode is used for working of two groups of methanol generator sets.
3. The method of claim 1, wherein the number of methanol power generating units is two, the number of lithium battery packs is two, and the hybrid mode comprises a first hybrid mode, a second hybrid mode, a third hybrid mode, and a fourth hybrid mode;
specifically, if the current required load power is greater than a fourth preset value and less than a third preset value and the single lithium battery pack works abnormally, switching to the first mixed mode for working; the third preset value is smaller than the second preset value, and the first mixed mode is a mode that a group of the methanol generator set and a group of the lithium battery set work;
if the current required load power is larger than the third preset value and smaller than the sum of the fourth preset value and the third preset value, and the single-group lithium battery pack works abnormally, switching to the second mixed mode for working; the second mixed mode is that two groups of the methanol generator sets and one group of the lithium battery packs work;
if the current required load power is larger than the first preset value and smaller than the third preset value and the two groups of lithium battery packs work normally, switching to the third mixed mode for working; the third mixed mode is that one group of the methanol generator set and two groups of the lithium battery packs work;
if the current required load power is larger than the third preset value and smaller than the sum of the second preset value and the first power and the two groups of lithium battery packs work normally, switching to the fourth mixed mode for working; and the fourth mixed mode is that two groups of methanol generator sets and two groups of lithium battery packs work.
4. The method of claim 3, wherein the first power is a lithium battery pack rated power and the second power is a methanol generator pack rated power;
the first preset value is 0.8 times of first power;
the second preset value is 2 times of second power;
the third preset value is 0.8 times of the second power;
the fourth preset value is 0.4 times of the first power.
5. The method of claim 1, wherein the self-state of the lithium battery pack comprises: the on-grid condition of the lithium battery pack and the charge state of the lithium battery pack;
the pure electric operating conditions include: the lithium battery pack is on the network, and the charge state of the lithium battery pack is larger than the first charge state;
the pure methanol operating conditions include: the lithium battery pack is not available or in an off-grid state.
6. The method of claim 1, wherein the control method further comprises: a semi-automatic mode of operation;
in the semiautomatic operation mode, the starting, stopping and the like of the methanol generator set and the lithium battery pack are controlled by a control signal triggering device, the triggering of the control signal triggering device is controlled by an operator, the methanol generator set is interlocked with the lithium battery pack, and the hybrid power system can only work in the pure electric mode or the pure methanol mode; when the hybrid power system fails, the automatic operation cannot be switched to the semi-automatic operation mode.
7. The method of claim 1, wherein the control method further comprises: a manual mode of operation;
in a manual operation mode, the starting, stopping and the like of the methanol generator set and the lithium battery pack are controlled by a control signal triggering device, the triggering of the control signal triggering device is controlled by an operator, and the pure methanol mode, the pure methanol mode and the mixed mode are manually switched according to the requirement; when a plurality of devices in the hybrid power system are in failure, the system is switched to a manual operation mode when the system cannot work normally.
8. A marine hybrid system control apparatus, characterized in that the hybrid system includes: the system comprises a methanol generator set, a lithium battery set, an electric load and a ship power grid; the control device comprises an automatic operation module, and the automatic operation module comprises:
a state judging unit for judging the current required load power of the electric load and the state of the lithium battery pack;
the pure electric operation unit is used for switching the power supply mode of the ship power grid into a pure electric mode when the current required load power is smaller than a first preset value and the self state of the lithium battery pack meets pure electric operation conditions; wherein the pure electric mode is powered by the lithium battery pack only;
the pure methanol operation unit is used for switching the power supply mode of the ship power grid into a pure methanol mode when the current load power is smaller than a second preset value and the pure methanol operation condition is met; wherein, the pure methanol mode is to be powered by the methanol generator set only;
the hybrid operation unit is used for switching the power supply mode of the ship power grid into a hybrid mode when the conditions are not met; the hybrid mode is to jointly supply power to the methanol generator set and the lithium battery pack.
9. A marine hybrid system, comprising: the system comprises a methanol generator set, a lithium battery set, an electric load, a ship power grid and a controller; the controller is configured to execute the marine hybrid system control method according to any one of claims 1 to 7.
10. A marine vessel, characterized in that the vessel comprises a marine hybrid system according to claim 9.
CN202310008217.6A 2023-01-04 2023-01-04 Control method, device and system of marine hybrid power system and ship Pending CN116161208A (en)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310008217.6A CN116161208A (en) 2023-01-04 2023-01-04 Control method, device and system of marine hybrid power system and ship

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