CN118244647A - Control method and diagnosis method of ship power system based on digital twin - Google Patents
Control method and diagnosis method of ship power system based on digital twin Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000003745 diagnosis Methods 0.000 title abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 221
- 239000000446 fuel Substances 0.000 claims abstract description 64
- 239000000110 cooling liquid Substances 0.000 claims abstract description 51
- 239000013535 sea water Substances 0.000 claims description 85
- 239000002826 coolant Substances 0.000 claims description 32
- 238000002405 diagnostic procedure Methods 0.000 claims description 4
- 238000012163 sequencing technique Methods 0.000 claims description 4
- 238000013135 deep learning Methods 0.000 claims description 3
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- 230000002159 abnormal effect Effects 0.000 claims description 2
- 238000012806 monitoring device Methods 0.000 description 21
- 238000012544 monitoring process Methods 0.000 description 10
- 239000012809 cooling fluid Substances 0.000 description 4
- 239000002828 fuel tank Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
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Abstract
The application is suitable for the technical field of self-adaptive control systems, and provides a control method and a diagnosis method of a ship power system based on digital twin. The control method comprises the following steps: establishing a digital twin model of a ship power system, wherein the ship power system comprises power equipment and a cooling unit; acquiring the real-time fuel inflow information of the power equipment; acquiring a fuel consumption model of a ship power system, and acquiring fuel prediction demand information based on the fuel consumption model; acquiring real-time temperature difference information of the inlet temperature and the outlet temperature of cooling liquid of power equipment; and confirming working parameters of the cooling unit based on the fuel real-time inflow information, the fuel predicted demand information and the real-time temperature difference information, and controlling the operation of the cooling unit. The application adjusts the running state of the cooling unit in advance according to the change of the fuel, so that the refrigerating capacity of the cooling unit can be changed synchronously with the heat of the power equipment, thereby ensuring that the temperature of the power equipment can be maintained stable and ensuring the normal running of the power equipment.
Description
Technical Field
The invention belongs to the technical field of self-adaptive control systems, and particularly relates to a control method and a diagnosis method of a ship power system based on digital twin.
Background
Digital twinning refers to a technique of real-time simulation, monitoring and optimization using data of a digital model and an actual system. In the prior art, a digital model of the ship power system can be established by using a digital twin technology, the design of the power system can be improved by simulating and optimizing the model, the cost and time of an actual test are reduced, and the application and verification of a new technology are accelerated.
During operation of the ship power system, fuel is introduced into the power equipment, the fuel is combusted in the power equipment to generate heat energy, and then the heat energy is converted into mechanical energy through an engine to drive a propeller or other propulsion devices of the ship, so that propulsion is generated.
The ship power system further comprises cooling equipment for cooling the power equipment, so that the power equipment is prevented from being too high in temperature. The power equipment temperature is too high, can influence power equipment's work efficiency to, the too high temperature can lead to power equipment to overheat, causes safety problems such as conflagration even. However, the existing cooling device can cool the power device, but has poor cooling effect, and the temperature fluctuation of the power device is large, which is not beneficial to the normal operation of the power device.
Disclosure of Invention
The invention aims to provide a control method and a diagnosis method of a ship power system based on digital twinning, which solve the technical problems in the background technology.
The invention is realized in the following way:
In a first aspect, an embodiment of the present application provides a method for controlling a digital twin-based marine power system, including: establishing a digital twin model of a ship power system, wherein the ship power system comprises power equipment and a cooling unit, and the cooling unit and the power equipment form a cooling liquid circulation channel; acquiring the real-time fuel inflow information of the power equipment; acquiring a fuel consumption model of a ship power system, and acquiring fuel prediction demand information based on the fuel consumption model; acquiring real-time temperature difference information of the inlet temperature and the outlet temperature of cooling liquid of power equipment; based on the fuel real-time inflow information, the fuel predicted demand information and the real-time temperature difference information, working parameters of the cooling unit are confirmed, the cooling unit is controlled to operate, and the working parameters comprise: circulation flow rate information of the cooling liquid, working power information of the cooling unit and working quantity information of the cooling unit.
Further, the acquiring the fuel consumption model of the power system includes: establishing a fuel initial model of a ship power system, and acquiring historical operation parameters of the ship power system, wherein the historical operation parameters comprise power parameters and environment parameters; training the fuel initial model in a deep learning mode by taking the historical operation parameters as input parameters and the fuel consumption information of the power equipment as output parameters to obtain the fuel consumption model; the obtaining fuel forecast demand information includes: and acquiring predicted operation parameters of the ship power system, inputting the predicted operation parameters into the fuel consumption model, and acquiring fuel predicted demand information.
Further, the controlling the operation of the cooling unit includes: controlling the working efficiency of the cooling unit to be changed between 50% and 75%; under the condition that the working quantity of the cooling units is required to be increased from N-1 to N, firstly controlling the working efficiency of the N-1 cooling unit in a running state to be increased to 75%, and then starting the N cooling unit, wherein the working efficiency of the N cooling unit is equal to 50% when starting, and N is a positive integer greater than or equal to 2.
Further, the ship power system further comprises a seawater heat exchange device, wherein the seawater heat exchange device is arranged on a circulating channel of the cooling liquid and is positioned between a cooling liquid inlet of the cooling unit and a cooling liquid outlet of the power device, and the seawater flow rate information of the seawater heat exchange device is confirmed according to the fuel real-time inlet amount information, the fuel predicted demand amount information and the real-time temperature difference information to control the operation of the seawater heat exchange device.
Further, after the working efficiency of the (N-1) th cooling unit in the running state is increased to 75%, before the (N) th cooling unit is started, the method further comprises: starting up the seawater heat exchange equipment, wherein the seawater heat exchange equipment operates according to the seawater flow rate information; obtaining heat exchange quantity of seawater heat exchange equipment; The heat exchange quantity/>, of the Nth cooling unit under the state that the working efficiency is 50% is obtained; When/>Up to the upper limit, or/>Under the condition of (1), the seawater heat exchange equipment is shut down, and meanwhile, the Nth cooling unit is started.
Further, the heat exchange amount of the seawater heat exchange equipmentIs at maximum value/>At/>In the case of (1) >, whenShut down the seawater heat exchange equipment, at/>In the case of (1) >, whenThe seawater heat exchange equipment is shut down.
Further, the controlling the operation of the cooling unit includes: acquiring the accumulated working time length of all the cooling units, and respectively sequencing the cooling units in an operating state and sequencing the cooling units which are not operated according to the accumulated working time length; and starting a corresponding number of cooling units with shorter accumulated working time length in the non-running cooling units according to the working number information of the cooling units, or shutting down a corresponding number of cooling units with longer accumulated working time length in the cooling units in the running state.
In a second aspect, an embodiment of the present application further provides a diagnostic method for a digital twin-based ship power system, where the diagnostic method includes the following steps based on the control method provided in the foregoing embodiment: at the position ofUp to the upper limit, or/>Under the condition of (1) the cooling liquid outlet temperature/>, of the (N-1) th cooling unit is obtainedUnder the condition that the Nth cooling unit is started, the outlet temperature/>, of the cooling liquid of the Nth cooling unit is obtainedJudge/>And/>If the difference value of the two is within the preset range, the cooling unit works normally, and if the difference value of the two is not within the preset range, the cooling unit works abnormally.
Further, under the condition that the cooling unit works abnormally, the cooling liquid inlet temperature of the nth cooling unit is obtainedAnd coolant outlet temperature/>Judge/>And/>If the difference value of the (b) is within the preset range, the nth cooling unit works normally, if the difference value is not within the preset range, the nth cooling unit works abnormally,N is a positive integer.
Further, before the nth cooling unit is started, the temperature difference between the temperature of the cooling liquid inlet and the temperature of the cooling liquid outlet of the seawater heat exchange device is obtained, whether the temperature difference accords with a preset range is judged, if the temperature difference is within the preset range, the seawater heat exchange device works normally, the nth cooling unit is started, if the temperature difference is outside the preset range, the seawater heat exchange device works abnormally, and the seawater heat exchange device is debugged until the temperature difference is within the preset range.
The beneficial effects of the invention are as follows:
According to the invention, the digital twin model of the ship power system is established, so that the running condition of the ship power system under different working conditions is simulated, and the ship power system can run more intelligently, efficiently and reliably; and through obtaining real-time intake information of fuel, fuel forecast demand information and real-time temperature difference, the running state of cooling unit is adjusted in advance according to the change of fuel for cooling unit's refrigerating output can be with power equipment's heat synchronous change, thereby guarantees that power equipment's temperature can maintain stably, avoids power equipment's temperature too high or too low, avoids power equipment's temperature fluctuation too big, influences power equipment's normal operating, and simultaneously, power equipment's temperature is stable, is of value to extension coolant and power equipment's life.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the embodiments of the present invention or the drawings used in the description of the prior art, and it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a control method according to an embodiment of the present application;
FIG. 2 is a schematic diagram of the modular connection of a marine power system according to an embodiment of the present application;
Fig. 3 is a schematic flow chart of a diagnostic method according to an embodiment of the present application.
In the figure: 100-power equipment, 200-cooling units, 300-seawater heat exchange equipment, 400-cooling liquid pipelines, 500-fuel tanks, 600-cooling liquid tanks, 701-first flow monitoring equipment, 702-second flow monitoring equipment, 703-third flow monitoring equipment, 801-first temperature monitoring equipment, 802-second temperature monitoring equipment, 803-third temperature monitoring equipment, 804-fourth temperature monitoring equipment and 805-fifth temperature monitoring equipment.
Detailed Description
The following description provides many different embodiments, or examples, for implementing different features of the invention. The elements and arrangements described in the following specific examples are presented for purposes of brevity and are provided only as examples and are not intended to limit the invention.
In the related art, a cooling system in a ship power system is adaptively adjusted along with the temperature change of power equipment, and adjustment can be started only after the temperature change of the power equipment is detected, so that adjustment delay exists, the loss risk of the power equipment and cooling liquid can be increased in the adjustment delay, the temperature fluctuation of the power equipment is large, and the continuous use of the power equipment and the cooling liquid is not facilitated.
In view of this, an embodiment of the present application provides a control method for a digital twin-based ship power system, referring to fig. 1, a digital twin model of the ship power system is first built, the ship power system includes a power device 100 and a cooling unit 200, a cooling liquid pipe 400 through which cooling liquid flows is connected between the cooling unit 200 and the power device 100, and the cooling unit 200 and the power device 100 form a cooling liquid circulation channel. The coolant circulates between the cooling unit 200 and the power plant 100. The cooling liquid flows out of the cooling unit 200, flows into the power equipment 100, cools the power equipment 100, and the used cooling liquid is output from the power equipment 100 and is input into the cooling unit 200, and after being processed by the cooling unit 200, the cooling liquid flows out of the cooling unit 200 and flows into the power equipment 100 to form circulation.
The running conditions of the ship power system under different working conditions can be simulated through the digital twin model, so that the ship power system can run more intelligently, efficiently and reliably, and the operation and regulation of the ship power system are more convenient for operators based on the digital twin model of the ship power system.
Then acquiring the real-time fuel inflow information of the power equipment 100; acquiring a fuel consumption model of a ship power system, and acquiring fuel prediction demand information through the fuel consumption model; real-time temperature difference information of the coolant inlet temperature and the coolant outlet temperature of the power plant 100 is acquired.
The power plant 100 is connected to a fuel tank 500, and as shown in fig. 2, the fuel tank 500 inputs fuel to the power plant 100, a first flow rate monitoring device 701 is provided in a connection pipe between the fuel tank 500 and the power plant 100, and the first flow rate monitoring device 701 can acquire real-time fuel inflow information. The coolant pipe 400 at the coolant outlet of the power plant 100 is provided with a first temperature monitoring device 801, and the coolant outlet temperature of the power plant 100 is obtained by the first temperature monitoring device 801. The coolant pipe 400 at the coolant inlet of the power plant 100 is provided with a third temperature monitoring device 803, and the coolant inlet temperature of the power plant 100 is acquired by the third temperature monitoring device 803.
Based on the fuel real-time intake information, the fuel predicted demand information, and the real-time temperature difference information, the operating parameters of the cooling unit 200 are confirmed, and the cooling unit 200 is controlled to operate according to the acquired operating parameters. The operating parameters of the cooling unit 200 include: circulation flow rate information of the cooling fluid, operation power information of the cooling unit 200, and operation number information of the cooling unit 200.
The heat change in the power equipment 100 can be confirmed through the difference between the real-time fuel inflow information and the predicted fuel demand information, the real-time refrigerating capacity of the cooling unit 200 can be confirmed through the real-time temperature difference between the cooling liquid inlet temperature and the cooling liquid outlet temperature of the power equipment 100, and the refrigerating capacity of the cooling unit 200 in a period of time in the future is calculated based on the heat change and the real-time refrigerating capacity of the cooling unit 200, so that the refrigerating capacity of the cooling unit 200 can be synchronously changed with the heat of the power equipment 100, the overall temperature of the power equipment 100 can be ensured to be kept stable, the excessive temperature fluctuation of the power equipment 100 is avoided, and the excessive high or low temperature of the power equipment 100 is avoided, thereby affecting the normal operation of the power equipment 100; in addition, the circulating flow rate of the cooling liquid is controlled in advance, so that the temperature fluctuation range of the cooling liquid is reduced; the smaller temperature fluctuation range of the cooling fluid and the power plant 100 is beneficial to prolonging the service life of the cooling fluid and the power plant 100.
The coolant pipe 400 is provided with a third flow rate monitoring device 703, and referring to fig. 2, the circulation flow rate of the coolant may be monitored by the third flow rate monitoring device 703, to obtain the circulation flow rate of the coolant.
The refrigerating capacity of the cooling unit 200 is determined according to the operation parameters thereof, and by way of example, the circulation flow rate of the cooling fluid between the power plant 100 and the cooling unit 200 may be adjusted, the operation efficiency of the cooling unit 200 may be adjusted, and the number of operations of the cooling unit 200 may be adjusted. The cooling units 200 are generally provided in plural, at least two, and the plural cooling units 200 are connected in sequence. In the present application, the cooling units 200 generally refer to all the cooling units 200 in the power system of the ship, and it is clearly explained what cooling unit 200 is for the individual cooling units 200 to be described.
In some embodiments of the application, the specific steps of obtaining a fuel consumption model of a marine power system include:
firstly, establishing a fuel initial model of a ship power system, and acquiring historical operation parameters of the ship power system, wherein the historical operation parameters comprise power parameters and environmental parameters; and then training the initial fuel model in a deep learning mode by taking the historical operation parameters as input parameters and the fuel consumption information of the power equipment 100 as output parameters to obtain a fuel consumption model.
After the fuel consumption model is obtained, the predicted operation parameters of the ship power system are obtained, the operation change trend of the ship power system is determined, and then the predicted operation parameters are input into the fuel consumption model to obtain the predicted fuel demand information.
In the cooling unit 200, when the cooling capacity needs to be increased, the working efficiency of the cooling unit 200 is generally increased first, and the number of operations of the cooling unit 200 is not increased until the upper limit of the working efficiency of the cooling unit 200 is increased. Similarly, in the case where the cooling capacity needs to be reduced, the working efficiency of one of the cooling units 200 is generally reduced, and the number of the cooling units 200 is not reduced until the working efficiency of the cooling unit 200 is reduced to the lower limit.
In some embodiments of the present application, specific operations for controlling the operation of the cooling unit 200 include:
The operating efficiency of the cooling unit 200 is controlled to vary between 50% and 75%. 50% to 75% are the best working efficiency of the cooling unit 200, and in the case that the working efficiency of the cooling unit 200 is in this interval, the loss to the cooling unit 200 is small, and the service life of the cooling unit 200 can be improved.
In the case that the number of the cooling units 200 needs to be increased from N-1 to N, the nth cooling unit 200 can be started up only by controlling the operation efficiency of the nth cooling unit 200 in the operation state to increase until the operation efficiency increases to 75%, the operation efficiency of the nth cooling unit 200 is equal to 50% when the nth cooling unit 200 is started up, and then the operation efficiency of the nth cooling unit 200 can be continuously increased according to the operation parameters of the cooling units 200, so that the number of the cooling units 200 in the operation state is continuously increased. Wherein N is a positive integer greater than or equal to 2.
In the case that the number of the cooling units 200 needs to be reduced from N to N-1, it is first required to control the reduction of the working efficiency of the nth cooling unit 200 in the operation state until the working efficiency is reduced to 50%, and the nth cooling unit 200 is turned off, and then the working efficiency of the nth-1 cooling unit 200 can be continuously reduced according to the working parameters of the cooling unit 200, so as to reduce the number of the cooling units 200 in the operation state.
In some embodiments of the present application, the ship power system further includes a seawater heat exchange device 300, wherein the seawater heat exchange device 300 is disposed on a circulation path of the coolant, between the coolant inlet of the cooling unit 200 and the coolant outlet of the power device 100, and performs a cooling process on the coolant in advance before the coolant is input into the cooling unit 200. And confirming the seawater flow rate information of the seawater heat exchange equipment 300 according to the real-time fuel inflow information, the fuel prediction demand information and the real-time temperature difference information, controlling the operation of the seawater heat exchange equipment 300, and cooling the cooling liquid. The seawater heat exchange device 300 is matched with the cooling unit 200 to increase the cooling means of the cooling liquid. Meanwhile, attention is paid to the coordination between the seawater flow rate information and the operation parameters of the cooling unit 200. The seawater heat exchange device 300 has a seawater inlet pipe and a seawater outlet pipe, the seawater inlet pipe is provided with a second flow monitoring device 702, and the seawater flow rate information is monitored by the second flow monitoring device 702.
In the process of increasing the number of the cooling units 200, since the working efficiency of the cooling units 200 needs to be controlled between 50% and 75%, and after one cooling unit 200 is added, the working efficiency of the newly added cooling unit 200 directly starts from 50%, the total efficiency of the plurality of cooling units 200 is suddenly increased, and the heat exchange amount of the cooling liquid is suddenly increased, which may cause difficulty in temperature regulation of the power equipment 100. In some embodiments of the present application, the seawater heat exchange device 300 is used to compensate for the steep increase in working efficiency from the N-1 cooling units 200 to the N units, and the specific steps are as follows:
After the working efficiency of the (N-1) th cooling unit 200 in the operation state is increased to 75%, before the (N) th cooling unit 200 is started, starting the seawater heat exchange equipment 300, wherein the seawater heat exchange equipment 300 operates according to the acquired seawater flow rate information;
obtaining the heat exchange amount of the seawater heat exchange device 300 Heat exchange quantity/>The heat exchange amount is increased as time increases, and the heat exchange amount is gradually increased as the seawater heat exchange device 300 is started;
acquiring the heat exchange quantity of the Nth cooling unit 200 to be started in the state that the working efficiency is 50% ；
When (when)Reaching an upper limit, or/>In the case of (a), the seawater heat exchange device 300 is turned off while the nth cooling unit 200 is started. Based on the cooperative switching control of the seawater heat exchange device 300 and the Nth cooling unit 200, after the seawater heat exchange device 300 is shut down, the heat exchange amount of the cooling liquid is reduced to 0, and meanwhile, as the Nth cooling unit 200 is started, the heat exchange amount of the cooling liquid is increased/>Therefore, the overall heat exchange amount of the cooling liquid does not fluctuate much or hardly fluctuates, and correspondingly, the overall temperature of the cooling liquid does not fluctuate much or hardly fluctuates, so that the influence of the abrupt increase of the total efficiency of the plurality of cooling units 200 on the temperature control of the power plant 100 is avoided, and the control accuracy of the ship power system is improved. Further preferably, in the case that the heat exchange amount acceleration rate of the seawater heat exchange device 300 is identical to the heat exchange amount acceleration rate of the cooling unit 200, stepless adjustment of the cooling effect can be achieved.
In addition, before judging whether to shut down the seawater heat exchange device 300, it is necessary to acquire the heat exchange amount of the seawater heat exchange device 300Is at maximum value/>Only at/>In the case of (1) >, whenThe seawater heat exchange device 300 is shut down. In this case, the heat exchange amount is also increased sharply between the (N-1) th cooling unit 200 and the (N) th cooling unit 200, and it is preferable to replace the seawater heat exchange apparatus 300 having a higher maximum heat exchange amount. At/>In the case of (1) >, whenIn the case of (2), the seawater heat exchange device 300 can be shut down, so that the (N-1) th cooling unit 200 is stably connected with the (N) th cooling unit 200.
Since the seawater heat exchange device 300 needs to be rapidly shut down, the water outlet of the seawater heat exchange device 300 needs to rapidly discharge the seawater inside.
In the process of reducing the number of the cooling units 200, since the working efficiency of the cooling units 200 needs to be controlled between 50% and 75%, after one working cooling unit 200 is reduced, the working efficiency of the newly reduced cooling unit 200 is directly reduced from 50% to 0%, so that the total efficiency of the cooling units 200 is reduced abruptly, the heat exchange amount of the cooling liquid is reduced abruptly, and the temperature control of the power plant 100 is difficult. In this regard, in some embodiments of the present application, the seawater heat exchange device 300 is used to compensate for the steep drop in operating efficiency from the N cooling units 200 to the N-1 cooling units 200, and the specific steps are as follows:
After the working efficiency of the nth cooling unit 200 in the operation state is reduced to 50%, the seawater heat exchange device 300 is started while the nth cooling unit 200 is turned off, and the heat exchange amount of the seawater heat exchange device 300 at the initial stage of the starting is In the followingIn the case of/>At/>In the case of/>. The heat exchange amount of the seawater heat exchange device 300 is then slowly reduced until it is reduced to zero. In this way, the seawater heat exchange device 300 has higher requirements, and the seawater heat exchange device 300 needs to reach/> quickly after being started。
In some preferred embodiments, since there are multiple groups of cooling units 200, in order to increase the service life of the cooling units 200, when controlling the operation of the cooling units 200, it is necessary to select the cooling units 200 that are increased or decreased according to the accumulated operating time of the cooling units 200, so that the accumulated operating time of the cooling units 200 is as balanced as possible, and the specific operation steps are as follows:
Firstly, the accumulated working time of all the cooling units 200 is obtained, the cooling units 200 in the running state are respectively ordered according to the accumulated working time, and the cooling units 200 which are not running are ordered. The cooling units 200 are divided into two types, which are in operation and are not in operation, and the two types of cooling units 200 are ordered according to the accumulated working time length.
And then according to the information of the working number of the cooling units 200, starting the cooling units 200 with shorter accumulated working time periods corresponding to the number of the cooling units 200 which are not operated, or shutting down the cooling units 200 with longer accumulated working time periods corresponding to the number of the cooling units 200 which are in an operating state. For example, when the number of cooling units 200 needs to be increased, the cooling unit 200 with the shortest cumulative operating time length is selected as an object of increase from among the non-operating cooling units 200, and when two or more cooling units 200 need to be increased, the two or more cooling units 200 with the shortest cumulative operating time length are selected and sequentially started in the order from short to long cumulative operating time length. When the number of cooling units 200 needs to be reduced, the cooling unit 200 with the longest accumulated operating time length is selected as a reduction object, and when two or more cooling units 200 need to be reduced, the two or more cooling units 200 with the longest accumulated operating time length are selected and turned off sequentially from long to short.
In the ship power system provided by the embodiment of the application, a cooling liquid tank 600 is further provided, and the cooling liquid tank 600 is located between the outlet of the cooling unit 200 and the inlet of the power equipment 100 and is used for storing cooling liquid. A third flow monitoring device 703 is provided between the coolant tank 600 and the power plant 100 to monitor the circulation flow rate of the coolant entering the power plant 100.
The embodiment of the application also provides a diagnosis method of the ship power system based on digital twin, which comprises the following specific diagnosis steps of:
As shown with reference to fig. 3, in Up to the upper limit, or/>In the case of (2), the cooling liquid outlet temperature/>, of the (N-1) th cooling unit 200 is obtainedIn the case where the nth cooling unit 200 is started, the cooling liquid outlet temperature/>, of the nth cooling unit 200 is obtainedJudge/>And/>If the difference value of (2) is within the preset range, the cooling unit 200 works normally, and if the difference value is not within the preset range, the cooling unit 200 works abnormally. The preset range is set in advance.
Referring to fig. 2, a second temperature monitoring device 802 is disposed at the coolant inlet and the coolant outlet of any cooling unit 200, the second temperature monitoring device 802 is used for monitoring the temperature of the coolant flowing through the cooling unit 200, and temperature data such as the coolant inlet temperature and the coolant outlet temperature of the cooling unit 200 are obtained through the second temperature monitoring device 802.
Further, after the cooling unit 200 is primarily judged to be abnormal, the temperatures of the inlets and outlets of the cooling units 200 in the cooling unit 200 can be detected, so that the cooling unit 200 with a specific problem can be detected. The specific investigation method is as follows: obtaining the coolant inlet temperature of the nth cooling unit 200And coolant outlet temperature/>Judge/>And/>If the difference value of (2) is within the preset range, the nth cooling unit 200 works normally, if not, the nth cooling unit 200 works abnormally, wherein/>N is a positive integer.
In some preferred embodiments, it is desirable to determine whether the seawater heat exchange device 300 is functioning properly before the nth cooling unit 200 is started. Specifically, firstly, the temperature difference between the cooling liquid inlet temperature and the cooling liquid outlet temperature of the seawater heat exchange device 300 is obtained, whether the temperature difference accords with a preset range is judged, if the temperature difference is within the preset range, the seawater heat exchange device 300 works normally, the nth cooling unit 200 can be started, and if the temperature difference is outside the preset range, the seawater heat exchange device 300 works abnormally, the seawater heat exchange device 300 needs to be debugged until the temperature difference is within the preset range, and the nth cooling unit 200 can be started.
Referring to fig. 2, the coolant inlet temperature of the seawater heat exchange device 300 may be acquired through a first temperature monitoring device 801, and the coolant inlet temperature of the seawater heat exchange device 300 may be acquired through a second temperature monitoring device 802 located in front of the cooling unit 200. In addition, referring to fig. 2, the seawater inlet pipe of the seawater heat exchange device 300 is provided with a fourth temperature monitoring device 804, the seawater outlet pipe is provided with a fifth temperature monitoring device 805, the seawater inlet temperature can be obtained through the fourth temperature monitoring device 804, the seawater outlet temperature can be obtained through the fifth temperature monitoring device 805, and whether the seawater heat exchange device 300 is normally operated can be further judged through the seawater inlet temperature, the seawater outlet temperature and the seawater flow rate information obtained through the second flow monitoring device 702.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. A control method of a digital twin-based marine power system, the control method comprising:
Establishing a digital twin model of a ship power system, wherein the ship power system comprises power equipment and a cooling unit, and the cooling unit and the power equipment form a cooling liquid circulation channel;
acquiring the real-time fuel inflow information of the power equipment;
Acquiring a fuel consumption model of a ship power system, and acquiring fuel prediction demand information based on the fuel consumption model;
acquiring real-time temperature difference information of the inlet temperature and the outlet temperature of cooling liquid of power equipment;
Based on the fuel real-time inflow information, the fuel predicted demand information and the real-time temperature difference information, working parameters of the cooling unit are confirmed, the cooling unit is controlled to operate, and the working parameters comprise: circulation flow rate information of the cooling liquid, working power information of the cooling unit and working quantity information of the cooling unit.
2. The method for controlling a digital twin-based marine power system according to claim 1, wherein the obtaining the fuel consumption model of the marine power system comprises:
Establishing a fuel initial model of a ship power system, and acquiring historical operation parameters of the ship power system, wherein the historical operation parameters comprise power parameters and environment parameters;
training the fuel initial model in a deep learning mode by taking the historical operation parameters as input parameters and the fuel consumption information of the power equipment as output parameters to obtain the fuel consumption model;
the obtaining fuel forecast demand information includes: and acquiring predicted operation parameters of the ship power system, inputting the predicted operation parameters into the fuel consumption model, and acquiring fuel predicted demand information.
3. A method of controlling a digital twin based marine power system as defined in claim 1, wherein said controlling said chiller operation comprises:
controlling the working efficiency of the cooling unit to be changed between 50% and 75%;
Under the condition that the working quantity of the cooling units is required to be increased from N-1 to N, firstly controlling the working efficiency of the N-1 cooling unit in a running state to be increased to 75%, and then starting the N cooling unit, wherein the working efficiency of the N cooling unit is equal to 50% when starting, and N is a positive integer greater than or equal to 2.
4. The control method of the digital twin ship power system according to claim 3, wherein the ship power system further comprises a seawater heat exchange device, the seawater heat exchange device is arranged on a cooling liquid circulation channel and is positioned between a cooling liquid inlet of the cooling unit and a cooling liquid outlet of the power device, and the seawater heat exchange device is controlled to operate according to the real-time fuel inflow information, the fuel prediction demand information and the real-time temperature difference information.
5. The control method of a digital twin ship power system according to claim 4, further comprising, after the operating efficiency of the nth-1 cooling unit in an operating state increases to 75%, before starting the nth cooling unit:
starting up the seawater heat exchange equipment, wherein the seawater heat exchange equipment operates according to the seawater flow rate information;
Obtaining heat exchange quantity of seawater heat exchange equipment ；
Acquiring the heat exchange quantity of the Nth cooling unit in the state that the working efficiency is 50%；
When (when)Up to the upper limit, or/>Under the condition of (1), the seawater heat exchange equipment is shut down, and meanwhile, the Nth cooling unit is started.
6. The control method of the digital twin-based ship power system according to claim 5, wherein the heat exchange amount of the seawater heat exchange deviceIs at maximum value/>At/>In the case of (1)Closing the seawater heat exchange equipment; at/>In the case of (1) >, whenThe seawater heat exchange equipment is shut down.
7. A method of controlling a digital twin based marine power system as defined in claim 1, wherein said controlling said chiller operation comprises:
Acquiring the accumulated working time length of all the cooling units, and respectively sequencing the cooling units in an operating state and sequencing the cooling units which are not operated according to the accumulated working time length;
And starting a corresponding number of cooling units with shorter accumulated working time length in the non-running cooling units according to the working number information of the cooling units, or shutting down a corresponding number of cooling units with longer accumulated working time length in the cooling units in the running state.
8. A method for diagnosing a marine propulsion system based on digital twinning, characterized in that the method comprises the following steps, based on the control method according to claim 5:
At the position of Up to the upper limit, or/>Under the condition of (1) the cooling liquid outlet temperature/>, of the (N-1) th cooling unit is obtainedUnder the condition that the Nth cooling unit is started, the outlet temperature/>, of the cooling liquid of the Nth cooling unit is obtainedJudge/>AndIf the difference value of the two is within the preset range, the cooling unit works normally, and if the difference value of the two is not within the preset range, the cooling unit works abnormally.
9. The method for diagnosing a digital twin ship power system according to claim 8, wherein the coolant inlet temperature of the nth cooling unit is obtained in case of abnormal operation of the cooling unitAnd coolant outlet temperature/>Judge/>And/>If the difference value of the (b) is within the preset range, the nth cooling unit works normally, if the difference value is not within the preset range, the nth cooling unit works abnormally, wherein/>N is a positive integer.
10. The diagnostic method of a digital twin ship power system according to claim 8, wherein before the nth cooling unit is started, the temperature difference between the cooling liquid inlet temperature and the cooling liquid outlet temperature of the seawater heat exchange device is obtained, whether the temperature difference accords with a preset range is judged, if the temperature difference is within the preset range, the seawater heat exchange device works normally, the nth cooling unit is started, if the temperature difference is outside the preset range, the seawater heat exchange device works abnormally, and the seawater heat exchange device is debugged until the temperature difference is within the preset range.
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