CN114435575B - Ship hybrid power system, energy management control method, equipment and storage medium - Google Patents
Ship hybrid power system, energy management control method, equipment and storage medium Download PDFInfo
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- CN114435575B CN114435575B CN202210196300.6A CN202210196300A CN114435575B CN 114435575 B CN114435575 B CN 114435575B CN 202210196300 A CN202210196300 A CN 202210196300A CN 114435575 B CN114435575 B CN 114435575B
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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
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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
- B63H21/21—Control means for engine or transmission, specially adapted for use on marine vessels
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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
- 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
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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
- B63H21/21—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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
Abstract
The invention discloses a ship hybrid power system, an energy management control method, equipment and a storage medium, wherein the energy management control method comprises the following steps: operating in a default operating mode; the default operating mode operation includes: acquiring the load power demand at fixed time; determining first power required to be output by the hydrogen fuel cell system according to the acquired load power demand and the current state of charge of the lithium battery system; acquiring a power predicted value of a hydrogen fuel cell system currently predicted by a preset power grey model, and judging whether the power predicted value is greater than first power; if yes, controlling the output power of the hydrogen fuel cell system to be adjusted to the predicted power value; and if not, controlling the output power of the hydrogen fuel cell system to be adjusted to the first power. According to the technical scheme, the energy efficiency of the ship hybrid power system is effectively improved.
Description
Technical Field
The invention relates to the field of ship hybrid power, in particular to a ship hybrid power system, an energy management control method, equipment and a storage medium.
Background
A hydrogen fuel cell is a device that generates electrical energy from the electrochemical reaction of air and hydrogen over a catalyst. In recent years, the requirements of the nation on carbon emission are gradually increased, and the nation continuously falls on the ground about carbon reduction, peak carbon reaching and energy policy related to carbon. With the future requirements of national energy strategy, the new energy position represented by hydrogen fuel cell will be continuously improved and will become a solution for energy transformation.
At present, hybrid power systems composed of a hydrogen fuel cell system and a lithium battery system are applied to ships, and the power requirements (i.e., load power requirements) of the ships are changing continuously during the sailing process of the ships. Because the output power of the hydrogen fuel cell system is regulated slowly and the characteristic of the lithium battery system for quickly regulating the output power is not available, the lithium battery system is mainly used as a main power source at present, and the hydrogen fuel cell system is used for standby and supplement to meet the continuous change of the power demand of the ship.
The energy control strategy of the existing ship hybrid power system is as follows: correspondingly adjusting the output power of the hydrogen fuel cell system according to the state of charge (SOC state) of the lithium battery system, wherein the higher the state of charge of the lithium battery system is, the smaller the proportion of the output power of the hydrogen fuel cell system is. When the state of charge of the lithium battery system is lower than a certain value, a part of the output power of the hydrogen fuel cell system is used for charging the lithium battery system. However, the energy charged to the lithium battery system by the hydrogen fuel cell system cannot be converted completely, and there is a partial loss (about 2%), and when the energy charged to the lithium battery system by the hydrogen fuel cell system is output to a ship by the lithium battery system, there is a partial loss (about 2%); due to the circulation, a large part of energy is wasted by loss, and the energy efficiency of the ship hybrid power system is reduced.
Disclosure of Invention
The invention provides an energy management control method, equipment and a storage medium of a ship hybrid power system, and aims to improve the energy efficiency of the ship hybrid power system.
In order to achieve the above object, the present invention provides an energy management control method for a hybrid power system of a ship, where the hybrid power system of the ship includes a lithium battery system and a hydrogen fuel cell system, and the energy management control method includes:
operating in a default operating mode;
the default operating mode operation includes:
acquiring the load power demand at fixed time;
determining first power required to be output by the hydrogen fuel cell system according to the acquired load power demand and the current state of charge of the lithium battery system;
acquiring a power predicted value of a hydrogen fuel cell system currently predicted by a preset power grey model, and judging whether the power predicted value is greater than the first power;
if so, controlling the output power of the hydrogen fuel cell system to be adjusted to the predicted power value;
and if not, controlling the output power of the hydrogen fuel cell system to be adjusted to the first power.
In some embodiments, after the step of timing the acquisition of the load power demand, the energy management control method further comprises:
determining a variation value of the acquired load power demand;
switching to a first working condition operation mode for operation after detecting that the change value of the acquired load power demand is smaller than a first preset value for continuous preset times;
the first operating mode operation comprises:
acquiring a load power demand at fixed time, and determining a change value of the acquired load power demand;
and controlling the output power of the hydrogen fuel cell system to adjust along with the predicted power value predicted by the power grey model.
In some embodiments, operating in the first operating mode further comprises:
and when detecting that the acquired change value of the load power demand is greater than a second preset value, switching from the first working condition operation mode to the default operation mode, wherein the second preset value is greater than or equal to the first preset value.
In some embodiments, the step of determining a change value of the obtained load power demand comprises:
determining an absolute value of a difference between the obtained load power demand and a previously obtained load power demand, and taking the determined absolute value as the change value; or the like, or a combination thereof,
the step of determining a change value of the obtained load power demand comprises:
determining an absolute value of a difference between the obtained load power demand and a previously obtained load power demand;
and taking the ratio of the determined absolute value to the load power demand obtained last time as the change value.
In some embodiments, the step of determining the first power to be output by the hydrogen fuel cell system according to the obtained load power demand and the current state of charge of the lithium battery system comprises:
determining second power which can be output by the lithium battery system according to the current state of charge of the lithium battery system;
and taking the difference value between the acquired load power demand and the second power as the first power.
In some embodiments, the step of determining the first power to be output by the hydrogen fuel cell system according to the obtained load power demand and the current state of charge of the lithium battery system comprises:
determining second power which can be output by the lithium battery system according to the current state of charge of the lithium battery system;
when the current state of charge of the lithium battery system is larger than a third preset value, determining the difference value between the acquired load power demand and the second power as the first power;
and when the current charge state of the lithium battery system is smaller than or equal to a third preset value, determining corresponding charging power according to the current charge state of the lithium battery system, and taking the difference value between the acquired load power demand and the second power and the determined charging power as the first power.
In some embodiments, the prediction algorithm of the preset power gray model is:
generating an initial power sequence according to the load power requirements of the previous n moments of the current moment, and accumulating to generate a new power sequence;
establishing a matrix B and y, and solving estimated values a and u;
establishing a first order differential equation and predicting a new power sequence;
reducing the initial power sequence through a post-subtraction operation to obtain a predicted value;
and (6) checking the prediction accuracy.
The invention further provides energy management control equipment of the ship hybrid power system, wherein the ship hybrid power system comprises a lithium battery system and a hydrogen fuel battery system; the energy management control device comprises at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores computer program instructions executable by the at least one processor to cause the at least one processor to perform the energy management control method described above.
The invention further provides a ship hybrid power system which is characterized by comprising a lithium battery system, a hydrogen fuel battery system and the energy management control equipment.
The present invention further provides a storage medium storing a computer program, which when executed by a processor implements the energy management control method described above.
According to the technical scheme of the energy management control method, the load power requirement is obtained at regular time, the first power required to be output by the hydrogen fuel cell system is determined according to the charge state of the lithium battery system after the load power requirement is obtained every time, the power predicted value of the hydrogen fuel cell system currently predicted by the preset power gray model is obtained, the first power is compared with the power predicted value, when the obtained power predicted value is larger than the first power, the output power of the hydrogen fuel cell system is adjusted to the obtained power predicted value, so that the load power requirement is met as much as possible through the output power of the hydrogen fuel cell system, the output power occupation ratio of the lithium battery system is reduced, the consumption of the lithium battery system is reduced, the charging frequency of the lithium battery system is further reduced, the loss caused by the charging and discharging of the lithium battery system is further reduced, and the energy efficiency of the ship hybrid power system is further improved. And when the power prediction value of the hydrogen fuel cell system currently predicted by the power grey model is smaller than or equal to the first power, the output power of the hydrogen fuel cell system is adjusted to the first power, and the output power of the hydrogen fuel cell system and the output power of the lithium battery system can meet the current load power requirement.
Drawings
FIG. 1 is a flow chart illustrating an energy management control method according to an embodiment of the invention;
FIG. 2 is a flow chart illustrating an energy management control method according to an embodiment of the invention;
FIG. 3 is a flowchart illustrating an energy management control method according to an embodiment of the invention;
fig. 4 is a schematic structural diagram of an energy management control device in a hardware operating environment according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present invention and should not be construed as limiting the present invention, and all other embodiments that can be obtained by one skilled in the art based on the embodiments of the present invention without inventive efforts shall fall within the scope of protection of the present invention.
The invention provides an energy management control method of a ship hybrid power system, wherein the ship hybrid power system comprises a lithium battery system and a hydrogen fuel battery system.
Referring to fig. 1, fig. 1 is a flowchart illustrating an energy management control method according to an embodiment of the invention.
In this embodiment, the energy management control method includes:
step 100, operating in a default operating mode;
the ship control system operates in a default operating mode after being started.
The default operating mode operation includes:
step S10, regularly acquiring load power requirements;
the ship control system may obtain the load power demand (i.e. the ship power demand) at regular time, for example, once every preset time (e.g. 2 seconds), and in the default operation mode, each time the load power demand is obtained, the following processing steps are performed before the load power demand is obtained next time.
Step S20, determining first power to be output by the hydrogen fuel cell system according to the acquired load power demand and the current state of charge of the lithium battery system;
after the load power demand is obtained, the ship control system determines the power which can be output by the lithium battery system according to the currently obtained load power demand and the current charge state of the lithium battery system, and further determines the power (namely the first power) which needs to be supplemented and output by the hydrogen fuel battery system, so that the power output by the hydrogen fuel battery system and the power output by the hydrogen fuel battery system can meet the currently obtained load power demand.
Step S30, acquiring a power predicted value of the hydrogen fuel cell system currently predicted by a preset power grey model, and judging whether the power predicted value is greater than first power;
the ship control system is provided with a power grey model in advance, and the power grey model can predict a predicted power value of the hydrogen fuel cell system (namely the predicted output power of the hydrogen fuel cell system) in real time according to the load power demand at the previous n moments. After acquiring the load power demand, the ship control system also acquires a power predicted value of the hydrogen fuel cell system currently predicted by the power gray model, and compares the acquired power predicted value with the determined first power to judge which of the acquired power predicted value and the first power is larger.
Step S40, if yes, controlling the output power of the hydrogen fuel cell system to be adjusted to a predicted power value;
and when the obtained power predicted value is judged to be larger than the first power, controlling the output power adjustment value of the hydrogen fuel cell system to obtain the power predicted value. Under a stable working condition, that is, under a condition that the load power demand is relatively stable (for example, when the ship is sailing at a constant speed or at a uniform speed, or when the ship is sailing at a substantially constant speed or at a uniform speed), the predicted power value of the hydrogen fuel cell system predicted by the power gray model is a value very close to the magnitude of the load power demand, and is usually greater than the first power determined according to the state of charge of the lithium battery system, that is, the load power demand is satisfied as much as possible by the output power of the hydrogen fuel cell system, so that the output power proportion of the lithium battery system is reduced.
And step S50, if not, controlling the output power of the hydrogen fuel cell system to be adjusted to the first power.
And when the acquired predicted power value is judged to be less than or equal to the first power, controlling the output power of the hydrogen fuel cell system to be adjusted to the first power. Under an unstable working condition, that is, under the condition that the variation of the load power demand is large (for example, when a ship enters or leaves a port, or when a special condition is encountered), the power prediction value of the hydrogen fuel cell system currently predicted by the power gray model may be too large different from the currently obtained load power demand and may be smaller than the first power, and at this time, the output power of the hydrogen fuel cell system is adjusted to the first power, so that it is ensured that the output power of the hydrogen fuel cell system and the output power of the lithium battery system can satisfy the current load power demand together.
According to the energy management control method, the load power demand is obtained regularly, the first power required to be output by the hydrogen fuel cell system is determined according to the charge state of the lithium battery system after the load power demand is obtained every time, the power predicted value of the hydrogen fuel cell system currently predicted by the preset power gray model is obtained, the first power is compared with the power predicted value, when the obtained power predicted value is larger than the first power, the output power of the hydrogen fuel cell system is adjusted to the obtained power predicted value, the load power demand is met through the output power of the hydrogen fuel cell system as much as possible, the output power occupation ratio of the lithium battery system is reduced, the consumption of the lithium battery system is reduced, the charging frequency of the lithium battery system is further reduced, the loss caused by the charging and discharging of the lithium battery system is reduced, and the energy efficiency of the ship hybrid power system is further improved. And when the power prediction value of the hydrogen fuel cell system currently predicted by the power grey model is smaller than or equal to the first power, the output power of the hydrogen fuel cell system is adjusted to the first power, and the output power of the hydrogen fuel cell system and the output power of the lithium battery system can meet the current load power requirement.
Referring to fig. 2, fig. 2 is a flow chart illustrating an energy management method according to an embodiment of the invention.
In this embodiment, after the step of periodically obtaining the power demand of the load, the energy management control method further includes:
step S60, determining the change value of the acquired load power demand;
in this embodiment, the step of determining the change value of the acquired load power demand may be: determining an absolute value of a difference value between the acquired load power demand and the load power demand acquired last time, and taking the determined absolute value as a change value; that is, the variation value represents the variation value of the load power demand, for example, the currently acquired load power demand is 9.5kw or 10.5kw, and the variation value is 0.5kw when the previously acquired load power demand is 10 kw. The step of determining the value of the change in the acquired load power demand may further be: determining an absolute value of a difference value between the obtained load power demand and the load power demand obtained last time, and taking a ratio of the determined absolute value to the load power demand obtained last time as a change value; i.e. the transformation amount represents a transformation percentage of the load power demand, e.g. the currently acquired load power demand is 9.5kw or 10.5kw, and the last acquired load power demand is 10kw, the change value is 5%.
Step S70, after detecting that the change value of the acquired load power demand is smaller than a first preset value for continuous preset times, switching to a first working condition operation mode for operation;
wherein the preset times are times preset in the ship control system, such as 50 times and 100 times; the first predetermined value is a first reference value of a variation value preset in the ship control system, for example, 0.5kw, and further, for example, 5%. After determining the change value of the acquired load power demand each time, the ship control system compares the change value with a first preset value to determine the magnitude relation between the change value and the first preset value; when the ship control system detects that the obtained change values of the load power demand are smaller than the first preset value for the continuous preset times, the change range of the load power demand is small, and in the preset range, the ship is judged to be in a stable sailing state, and the ship control system is switched to the first working condition operation mode to operate.
Referring to fig. 3, fig. 3 is a flow chart illustrating an energy management method according to an embodiment of the invention.
In this embodiment, the first operating mode operation includes:
step S71, acquiring load power demand at regular time, and determining the change value of the acquired load power demand;
in the first operating mode, the ship control system still obtains the load power demand at regular time, that is, obtains the load power demand once every preset time (for example, 2 seconds), and determines a variation value of the obtained load power demand (refer to the detailed description of step S60), so as to monitor the variation value of the load power demand and determine whether the ship keeps a stable sailing state.
And step S72, controlling the output power of the hydrogen fuel cell system to be adjusted along with the predicted power value predicted by the power grey model.
The method has the advantages that the ship is determined to be in a stable sailing state, the load power requirements of the ship for the preset times are close, the power grey model is used for predicting the load power requirements (namely the power predicted values) of the ship at the next moment by collecting the current and previous load power requirements (or the output power values of the ship driving device), and therefore the power predicted values predicted by the power grey model are close to the load power requirements of the ship at the next moment. And the power grey model predicts the load power requirement at the next moment, so that the output power of the hydrogen fuel cell system is adjusted in advance, the output power at the adjacent moments is relatively close, the adjustment amount is small, and the problem that the output power of the hydrogen fuel cell system is slowly adjusted and changed is well solved.
Referring to fig. 3, in the present embodiment, the operation in the first operating condition operation mode further includes:
and S73, when the acquired change value of the load power demand is detected to be larger than a second preset value, switching the operation mode from the first working condition operation mode back to the default operation mode, wherein the second preset value is larger than or equal to the first preset value.
Under the first working condition operation mode, when the change value of the acquired load power requirement is detected to be larger than a second preset value, the sailing state of the ship is judged to be no longer a stable sailing state, at the moment, the power predicted value predicted by the power grey model possibly has the condition of great difference with the load power requirement at the next moment, and in order to ensure that the output power of the ship hybrid power system meets the load power requirement, at the moment, the first working condition operation mode is switched back to the default operation mode. The second preset value is a second reference amount of a variation value preset in the ship control system, such as 1kw or 1.5kw, and 10% or 15%, for example.
In some embodiments, the step of determining the first power to be output by the hydrogen fuel cell system based on the captured load power demand and the current state of charge of the lithium battery system comprises:
determining second power which can be output by the lithium battery system according to the current state of charge of the lithium battery system;
and taking the difference value of the acquired load power demand and the second power as the first power.
The method comprises the steps of firstly determining the current outputtable power (namely, second power) of a lithium battery system according to the current state of charge of the lithium battery system, and subtracting the current outputtable power of the lithium battery system from the obtained load power demand to obtain the power (namely, first power) which needs to be supplemented and output by a hydrogen fuel cell system, even if the sum of the second power output by the lithium battery system and the first power output by the hydrogen fuel cell system meets the obtained load power demand. The method for determining the second power which can be output by the lithium battery system according to the current state of charge of the lithium battery system can be as follows: determining the power corresponding to the current charge state of the lithium battery system according to a preset mapping relation between the charge state and the power of the lithium battery system in the ship control system, wherein the determined power is the second power; of course, the manner of determining the second power that can be output by the lithium battery system according to the current state of charge of the lithium battery system may also be other similar manners, or a manner that is common to existing lithium battery systems.
In some embodiments, the step of determining the first power to be output by the hydrogen fuel cell system based on the captured load power demand and the current state of charge of the lithium battery system comprises:
determining second power required to be output by the lithium battery system according to the current state of charge of the lithium battery system;
when the current state of charge of the lithium battery system is larger than a third preset value, determining the difference value between the acquired load power demand and the second power as a first power;
and when the current charge state of the lithium battery system is less than or equal to a third preset value, determining corresponding charging power according to the charge state of the lithium battery system, and adding the determined charging power to the difference value between the acquired load power demand and the second power to serve as the first power.
The third preset value is a reference value (e.g., 20%, 30%, etc.) of a preset state of charge in the ship control system, and is also a preset critical value for determining whether the lithium battery system needs to be charged. Firstly, determining the current output power (namely, second power) of the lithium battery system according to the current charge state of the lithium battery system, and then, when the current charge state of the lithium battery system is larger than a third preset value, determining that the lithium battery system does not need to be charged, subtracting the current output power of the lithium battery system from the acquired load power demand to obtain the power (namely, first power) which needs to be supplemented and output by the hydrogen fuel cell system; when the current state of charge of the lithium battery system is smaller than or equal to a third preset value, the lithium battery system is determined to need to be charged, corresponding charging power is determined according to the current state of charge of the lithium battery system, the difference value between the acquired load power demand and the second power is taken as first power, and the determined charging power is taken as second power, namely the hydrogen fuel cell system needs to be supplemented to the output power used for the load power demand and the part used for the charging power to be taken as the first power. The manner of determining the corresponding charging power according to the state of charge of the lithium battery system may be: determining charging power corresponding to the current charge state of a lithium battery system according to a preset mapping relation between the charge state and the charging power of the lithium battery system in a ship control system; of course, the manner of determining the corresponding charging power according to the state of charge of the lithium battery system may also be other similar manners, or a manner commonly used in existing lithium battery systems.
The prediction algorithm of the preset power gray model in the embodiment of the invention is as follows:
1. generating an initial power sequence according to the load power requirements of the previous n moments of the current moment, and accumulating to generate a new power sequence;
namely, the load power demand (or the output power value of the ship driving device) at the first n moments is collected by sampling to generate an initial power sequence p (0) ＝{p (0) (1)，p (0) (2)，...，p (0) (n) and accumulating to generate a new power sequence p (1) ＝{p (1) (1)，p (1) (2)，...，p (1) (n) }, wherein
2. Establishing a matrix B and y, and solving estimated values a and u;
wherein the content of the first and second substances,
y＝[p (0) (2)，p (0) (3)，...，p (0) (n)]let U be the parameter vector to be estimated>
Since y = BU, it can be obtained using least squares: u = (B) T B) -1 B T y, find a and u.
3. Establishing a first order differential equation and predicting a new power sequence;
the first order differential equation is in the form of
Solving the differential equation to obtain a prediction model:
4. reducing the initial power sequence through a post-subtraction operation to obtain a predicted value;
restoring the initial power sequence by a post-subtraction operation, p ^ (0) (k+1)＝p^ (1) (k+1)-p^ (1) (k) When k is greater than or equal to n, p ^ n (0) And (k + 1) is the predicted output power value.
5. And (6) checking the prediction accuracy.
Conversion into p ^ through accumulation and subtraction prediction value (0) ＝{p^ (0) (1)，p^ (0) (2)，...，p^ (0) (n) }, calculating a residual, wherein e (k) = p (0) (k)-p^ (0) (k) K =1,2, ·, n; wherein, the first and the second end of the pipe are connected with each other,
the variance of the initial power sequence and the residual sequence is ^ or ^ 4>
Calculating posterior difference ratio->
The smaller the value of C, the higher the prediction accuracy.
Based on the energy management control method proposed by the foregoing embodiment, the present invention also proposes an energy management control device of a ship hybrid power system, the energy management control device including:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein, the first and the second end of the pipe are connected with each other,
the memory stores computer program instructions executable by the at least one processor to cause the at least one processor to perform the method of energy management control of any of the embodiments described above.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an energy management control device in a hardware operating environment according to an embodiment of the present invention.
The energy management control equipment of the embodiment of the invention can be computing equipment such as a desktop computer, a notebook computer, a palm computer, a server and the like. As shown in fig. 4, the energy management control apparatus may include: a processor 1001, e.g. a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., a WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory such as a disk memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the energy management control device configuration shown in fig. 4 does not constitute a limitation of the energy management control device, and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 4, a memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and an energy management control program.
In the energy management control device shown in fig. 4, the network interface 1004 is mainly used for connecting to a background server and performing data communication with the background server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be used to invoke an energy management control program stored in the memory 1005.
The invention further provides a ship hybrid power system, which comprises a lithium battery system, a hydrogen fuel battery system and the energy management control device, wherein the structure of the energy management control device refers to the above embodiments, and the ship hybrid power system adopts the technical solutions of all the above embodiments, so that at least all the beneficial effects in the above embodiments are achieved, and details are not repeated herein.
Based on the energy management control method proposed by the foregoing embodiment, the present invention further proposes a storage medium, in which a computer program is stored, and when the computer program is executed by a processor, the energy management control method described in the foregoing embodiment is implemented, where the energy management control method at least includes the following steps:
operating in a default operating mode;
the default operating mode includes:
step 1, acquiring load power demand at regular time;
step 2, determining first power to be output by the hydrogen fuel cell system according to the acquired load power demand and the current state of charge of the lithium battery system;
step 3, acquiring a power predicted value of the hydrogen fuel cell system currently predicted by a preset power grey model, and judging whether the power predicted value is greater than the first power;
step 4, if yes, controlling the output power of the hydrogen fuel cell system to be adjusted to the predicted power value;
and 5, if not, controlling the output power of the hydrogen fuel cell system to be adjusted to the first power.
In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is only one logical division, and other divisions may be realized in practice, for example, a plurality of modules or components may be combined or integrated into another apparatus, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only a part of or preferred embodiments of the present invention, and neither the text nor the drawings should be construed as limiting the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings or directly/indirectly applied to other related technical fields in the spirit of the present invention are included in the scope of the present invention.
Claims (9)
1. An energy management control method of a ship hybrid power system, the ship hybrid power system comprising a lithium battery system and a hydrogen fuel battery system, the method comprising:
operating in a default operating mode;
the default operating mode operation includes:
acquiring the load power demand at fixed time;
determining first power required to be output by the hydrogen fuel cell system according to the acquired load power demand and the current state of charge of the lithium battery system;
acquiring a power predicted value of a hydrogen fuel cell system currently predicted by a preset power grey model, and judging whether the power predicted value is greater than the first power;
if so, controlling the output power of the hydrogen fuel cell system to be adjusted to the predicted power value;
if not, controlling the output power of the hydrogen fuel cell system to be adjusted to the first power;
the prediction algorithm of the preset power gray model is as follows:
generating an initial power sequence according to the load power requirements of the previous n moments of the current moment, and accumulating to generate a new power sequence;
establishing a matrix B and y, and solving estimated values a and u;
establishing a first order differential equation and predicting a new power sequence;
reducing the initial power sequence through a post-subtraction operation to obtain a predicted value;
and (6) checking the prediction accuracy.
2. The energy management control method of claim 1, further comprising, after the step of timing the acquisition of load power demand:
determining a variation value of the acquired load power demand;
switching to a first working condition operation mode for operation after detecting that the change value of the acquired load power demand is smaller than a first preset value for continuous preset times;
the first operating mode operation comprises:
acquiring a load power demand at fixed time, and determining a change value of the acquired load power demand;
and controlling the output power of the hydrogen fuel cell system to adjust along with the predicted power value predicted by the power grey model.
3. The energy management control method of claim 2, wherein the first operating mode operation further comprises:
and when detecting that the acquired change value of the load power demand is greater than a second preset value, switching from the first working condition operation mode to the default operation mode, wherein the second preset value is greater than or equal to the first preset value.
4. The energy management control method of claim 2 or 3, wherein the step of determining a change value of the captured load power demand comprises:
determining an absolute value of a difference between the obtained load power demand and a previously obtained load power demand, and taking the determined absolute value as the change value; or the like, or, alternatively,
the step of determining a change value of the obtained load power demand comprises:
determining an absolute value of a difference between the obtained load power demand and a previously obtained load power demand;
and taking the ratio of the determined absolute value to the load power demand obtained last time as the change value.
5. The energy management control method according to any one of claims 1 to 3, wherein the step of determining the first power to be output by the hydrogen fuel cell system based on the acquired load power demand and the current state of charge of the lithium battery system comprises:
determining second power which can be output by the lithium battery system according to the current charge state of the lithium battery system;
and taking the difference value between the acquired load power demand and the second power as the first power.
6. The energy management control method according to any one of claims 1 to 3, wherein the step of determining the first power to be output by the hydrogen fuel cell system based on the acquired load power demand and the current state of charge of the lithium battery system comprises:
determining second power which can be output by the lithium battery system according to the current state of charge of the lithium battery system;
when the current state of charge of the lithium battery system is larger than a third preset value, determining the difference value between the acquired load power demand and the second power as the first power;
and when the current charge state of the lithium battery system is smaller than or equal to a third preset value, determining corresponding charging power according to the current charge state of the lithium battery system, and taking the difference value between the acquired load power demand and the second power and the determined charging power as the first power.
7. The energy management control equipment of the ship hybrid power system is characterized in that the ship hybrid power system comprises a lithium battery system and a hydrogen fuel battery system; the energy management control device comprises at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores computer program instructions executable by the at least one processor to enable the at least one processor to perform the energy management control method of any of claims 1 to 6.
8. A marine hybrid system characterized by comprising a lithium battery system, a hydrogen fuel cell system, and the energy management control apparatus of claim 7.
9. A storage medium storing a computer program which, when executed by a processor, implements the energy management control method of any one of claims 1 to 6.
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