A modeling method and system for a hydrogen production device considering a multi-state startup process

Abstract

The present invention provides a method and system for modeling a hydrogen production device that considers a multi-state startup process. The method includes: obtaining information required for modeling the hydrogen production device; constructing a coupling relationship for describing the operating state of the hydrogen production device; the operating state includes a shutdown state, a standby state, and a hydrogen production state; based on the coupling relationship, constructing a constraint relationship for the hydrogen production device, including static operation constraints, start-up and shutdown constraints, ramp-up constraints, and real-time adjustment constraints; and constructing an operation planning model for the hydrogen production device under the constraints of the constraint relationship. Compared with the existing technology, this system considers and fully describes the operating states of the hydrogen production device, such as shutdown, standby, and hydrogen production; it solves the problem that the existing technology does not consider the dynamic adjustment characteristics of the hydrogen production process, effectively improves the operational reliability of the power system and the utilization rate of hydrogen energy, reduces hydrogen energy loss, and improves the hydrogen-to-electricity conversion rate.

Description

Technical Field

[0001] The present invention relates to the field of power systems, and in particular to a hydrogen production device modeling method and system considering a multi-state startup process. Background Art

[0002] In recent years, deep-seated problems such as low overall power system efficiency and insufficient complementarity among various power sources have become increasingly prominent. New power systems are primarily based on renewable energy. The integration of massive amounts of renewable energy has further increased the randomness of both the source and load sides of the power system. The resulting volatility and low moment of inertia pose significant challenges to medium- and long-term operational simulation and planning.

[0003] Hydrogen energy storage technology boasts clean, pollution-free operation, high energy density, and diverse hydrogen energy utilization. Existing hydrogen energy storage system modeling, particularly of hydrogen production units, fails to fully consider the production process characteristics of different technologies to describe processes such as cold start, hot start, or heating and pressurization, as well as operating states such as shutdown, standby, or hydrogen production. Furthermore, the dynamic characteristics of different hydrogen production technologies, such as the regulation range and fluctuation rate, are not fully described, making it impossible to fully explore the temporal correlation between the dynamic characteristics of energy storage systems and energy output fluctuations. Summary of the Invention

[0004] The present invention provides a hydrogen production device modeling method and system considering a multi-state startup process, which solves the technical problem that the prior art does not consider the dynamic adjustment characteristics and operating states of the hydrogen production process, and improves the operational reliability of the power system.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a hydrogen production device modeling method considering a multi-state startup process, comprising:

[0006] Obtain the information required for modeling the hydrogen production plant;

[0007] Constructing a coupling relationship for describing the working state of the hydrogen production device based on the information required for the modeling; wherein the working state of the hydrogen production device includes a shutdown state, a standby state, and a hydrogen production state;

[0008] Based on the coupling relationship, a constraint relationship of the hydrogen production device is constructed; wherein the constraint relationship includes static operation constraints, start-up and shutdown constraints, ramp constraints and real-time adjustment constraints;

[0009] Under the constraints of the constraint relationship, an operation planning model of the hydrogen production device is constructed.

[0010] As a preferred solution, the coupling relationship for describing the working state of the hydrogen production device is constructed as follows:

[0011] 0-1 variables are used to respectively describe whether the operating state parameters of the hydrogen production device meet the operating conditions, and a coupling relationship between the 0-1 variables and the operating state parameters is established; wherein the operating state parameters include temperature, pressure and power.

[0012] As a preferred solution, the operating state parameters include α and β;

[0013] When α is 0, the environmental parameters of the hydrogen production device do not meet the operating conditions; when α is 1, the environmental parameters of the hydrogen production device meet the operating conditions;

[0014] When β is 0, the power of the hydrogen production device does not meet the operating conditions, and when β is 1, the power of the hydrogen production device meets the operating conditions.

[0015] As a preferred solution, the static operation constraints are specifically:

[0016] β·phy P2Hmin ≤phy P2H ≤β·phy P2Hmax ;

[0017] Among them, phy P2H is the input power of the hydrogen production device, P2H indicates that the hydrogen production device is in the hydrogen production process, and phy P2Hmin is the minimum input power of the hydrogen production device, phy P2Hmax is the maximum input electrical power of the hydrogen production device.

[0018] As a preferred solution, the startup and shutdown constraints are specifically:

[0019]

[0020] Among them, α t is the environmental parameter of the hydrogen production device at time t, is the startup action of the hydrogen production device at time t, is the closing action of the hydrogen production device at time t.

[0021] As a preferred solution, the climbing constraint is specifically:

[0022]

[0023]

[0024] in, is the input electrical power of the hydrogen production device at time t, and ramp is the ramp power of the hydrogen production device.

[0025] As a preferred solution, the real-time adjustment constraints are specifically:

[0026] |phy P2H (s)-phy P2H |≤α·adj P2H ;

[0027] Among them, phy P2H is the real-time input power of the hydrogen production device, phy P2H (s) is the production plan preset by the hydrogen production device according to the predicted value, adj P2H It is the real-time adjustment rate of the hydrogen production device.

[0028] Accordingly, an embodiment of the present invention further provides a hydrogen production device modeling system that considers a multi-state startup process, including:

[0029] An acquisition module is used to obtain information required for modeling the hydrogen production device;

[0030] A coupling module, configured to construct a coupling relationship for describing the working state of the hydrogen production device according to the information required for the modeling; wherein the working state of the hydrogen production device includes a shutdown state, a standby state, and a hydrogen production state;

[0031] A constraint module, configured to construct a constraint relationship of the hydrogen production device based on the coupling relationship; wherein the constraint relationship includes static operation constraints, start-up and shutdown constraints, ramp-up constraints, and real-time adjustment constraints;

[0032] A modeling module is used to construct an operation planning model of the hydrogen production device under the constraints of the constraint relationship.

[0033] As a preferred solution, the coupling module is constructed to describe the coupling relationship of the working state of the hydrogen production device, specifically:

[0034] The coupling module uses 0-1 variables to respectively describe whether the operating status parameters of the hydrogen production device meet the operating conditions, and constructs a coupling relationship between the 0-1 variables and the operating status parameters; wherein the operating status parameters include temperature, pressure and power.

[0035] As a preferred solution, the operating state parameters include α and β;

[0036] When α is 0, the environmental parameters of the hydrogen production device do not meet the operating conditions; when α is 1, the environmental parameters of the hydrogen production device meet the operating conditions;

[0037] When β is 0, the power of the hydrogen production device does not meet the operating conditions, and when β is 1, the power of the hydrogen production device meets the operating conditions.

[0038] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0039] An embodiment of the present invention provides a method and system for modeling a hydrogen production device that considers a multi-state startup process. The method includes: obtaining information required for modeling the hydrogen production device; constructing a coupling relationship for describing the operating state of the hydrogen production device based on the information required for modeling; wherein the operating state of the hydrogen production device includes a shutdown state, a standby state, and a hydrogen production state; constructing a constraint relationship for the hydrogen production device based on the coupling relationship; wherein the constraint relationship includes a static operation constraint, a startup and shutdown constraint, a ramping constraint, and a real-time adjustment constraint; and constructing an operation planning model for the hydrogen production device under the constraints of the constraint relationship. Compared with the prior art, the coupling relationship capable of describing the operating state of the hydrogen production device considers and fully describes the operating states of the hydrogen production device, such as shutdown, standby, and hydrogen production; constructing the operation planning model based on the static operation constraint, startup and shutdown constraint, ramping constraint, and real-time adjustment constraint of the hydrogen production device, solves the problem of the prior art that the dynamic adjustment characteristics of the hydrogen production process are not considered, effectively improves the operational reliability of the power system and the utilization rate of hydrogen energy, reduces hydrogen energy loss, and improves the hydrogen-to-electricity conversion rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 : A flow chart of an embodiment of a method for modeling a hydrogen production device taking into account a multi-state startup process of the present invention.

[0041] Figure 2 : A schematic diagram of the principle of an embodiment of the coupling relationship of the working state of the hydrogen production device provided by the present invention.

[0042] Figure 3 : A structural schematic diagram of an embodiment of a hydrogen production device modeling system considering a multi-state startup process of the present invention. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] Embodiment one:

[0045] Please refer to Figure 1 , Figure 1 A method for modeling a hydrogen production device considering a multi-state startup process is provided in an embodiment of the present invention, comprising steps S1 to S4, wherein:

[0046] Step S1: obtaining information required for modeling a hydrogen production device.

[0047] Step S2: constructing a coupling relationship for describing the working state of the hydrogen production device according to the information required for the modeling; wherein the working state of the hydrogen production device includes a shutdown state, a standby state, and a hydrogen production state.

[0048] Step S3: constructing a constraint relationship of the hydrogen production device based on the coupling relationship; wherein the constraint relationship includes static operation constraints, start-up and shutdown constraints, ramp-up constraints, and real-time adjustment constraints.

[0049] Step S4: constructing an operation planning model of the hydrogen production device under the constraints of the constraint relationship.

[0050] In the above step S1, it is first necessary to determine the key technologies such as hydrogen production and storage to be adopted, and obtain the installation and operation and maintenance costs of the hydrogen energy storage device that need to be included in the cost based on the specific technology adopted; secondly, considering the characteristics of different hydrogen production and storage technologies, determine the technical parameters of the hydrogen energy storage system corresponding to the hydrogen production device, such as rated capacity, rated output and input power, hydrogen storage capacity range, power adjustment range, conversion efficiency and adjustment speed, so as to facilitate the subsequent modeling of the hydrogen production device and the operation planning and configuration of the power system.

[0051] For step S2, the existing technology usually uses a single 0-1 variable to represent the working state of the device. This method can only simply characterize the two states of the device, open and closed, or can only characterize the process from open state to closed state, and from closed state to open state.

[0052] In this embodiment, considering the requirements of the hydrogen production device for the environmental parameters for normal hydrogen production, the coupling relationship for describing the working state of the hydrogen production device is constructed, specifically including:

[0053] Double 0-1 variables are used to respectively describe whether the operating state parameters of the hydrogen production device meet the operating conditions, and a coupling relationship is established between the 0-1 variables and the operating state parameters; wherein the operating state parameters include temperature, pressure and power.

[0054] Furthermore, the operating state parameters are represented by α and β:

[0055] When α is 0, the environmental parameters of the hydrogen production device do not meet the operating conditions; when α is 1, the environmental parameters of the hydrogen production device meet the operating conditions;

[0056] When β is 0, the power of the hydrogen production device does not meet the operating conditions, and when β is 1, the power of the hydrogen production device meets the operating conditions.

[0057] The coupling relationship of the working state of the hydrogen production device is constructed by 0-1 variables and (α, β). Specifically, refer to Figure 2 :

[0058] When the (α, β) state is (0, 0), it indicates that the hydrogen production device is in the shutdown state; when it is (1, 0), it indicates that the hydrogen production device is in the standby state. At this time, the device has completed heating and pressurization, and the environmental parameters (including temperature and pressure) meet the operating conditions; when it is (1, 1), it indicates that the hydrogen production device is in the normal working state of producing hydrogen. Since the (0, 1) state does not exist in the actual operation process (that is, it is impossible to start the device but the environmental parameters do not meet the operating conditions), β is always less than or equal to α.

[0059] It can be understood that the transition from (0, 0) to (1, 0) is a heating and pressurizing process, while the transition from (1, 0) to (1, 1) is a hot start process, which increases the power of the hydrogen production device after the environmental parameters (including temperature and pressure) meet the operating conditions. The transition from (0, 0) to (1, 1) is a cold start process, which describes the simultaneous heating, pressurizing, and power increase of the hydrogen production device. The coupling relationship between the operating state of the hydrogen production device and (α, β) is constructed to effectively reflect the flexible adjustment performance of the hydrogen production device.

[0060] In the above step S3, based on the coupling relationship, the constraint relationship of the hydrogen production device is constructed, including static operation constraints, start-up and shutdown constraints, ramp constraints and real-time adjustment constraints. Specifically:

[0061] The static operation constraint is related to β in the coupling relationship, which constrains the hydrogen production device to be within the upper and lower power limits of normal operation. Specifically:

[0062] β·phy P2Hmin ≤phy P2H ≤β·phy P2Hmax ;

[0063] Among them, phy P2H is the input power of the hydrogen production device, P2H (power to hydrogen) indicates that the hydrogen production device is in the hydrogen production process, and phy P2Hmin is the minimum input power of the hydrogen production device, phy P2Hmax is the maximum input electrical power of the hydrogen production device.

[0064] Furthermore, considering the different startup states and operating states of the hydrogen production device and combining the adjustment speed, this embodiment also establishes a dynamic adjustment characteristic constraint of the device, specifically a start-up and shutdown constraint, which is related to α:

[0065]

[0066] Among them, α t is the environmental parameter of the hydrogen production device at time t, is the startup action of the hydrogen production device at time t, is the closing action of the hydrogen production device at time t.

[0067] and All are represented by 0-1 variables. When 1 is taken, Indicates that the device has executed the startup action. The closing action is executed; when it is 0, Indicates that the device does not take any startup action and maintains the state of the previous moment. This means that the device does not take the shutdown action and maintains the state at the previous moment (also, this embodiment does not allow the device to take the startup and shutdown actions at the same time). The implementation of the embodiment of the present application avoids the impact of frequent startup and shutdown on the service life of the device. In addition, it takes into account the buffer time required for the startup and shutdown operations of the device and adds the coupling relationship between the startup and shutdown actions and the startup and shutdown states of the device. This can effectively extend the operating life of the device and the orderliness of the operation planning, thereby achieving effective planning.

[0068] Since the input power of the device is temporally coupled in the scheduling plan within a continuous period of time, the input power adjustment of the device at adjacent moments must be within a certain allowable range. Preferably, a ramp constraint is adopted, specifically:

[0069]

[0070]

[0071] in, is the input electrical power of the hydrogen production device at time t, and ramp is the ramp power of the hydrogen production device.

[0072] In one embodiment, the constraint relationship further includes a real-time adjustment constraint, specifically:

[0073] |phy P2H (s)-phy P2H |≤α·adj P2H ;

[0074] Wherein, α is the environmental parameter of the hydrogen production device (including temperature and pressure), phy P2H is the real-time input power of the hydrogen production device, phy P2H (s) is the production plan preset by the hydrogen production device according to the predicted value, adj P2HThe real-time adjustment rate of the hydrogen production device. In the implementation of the embodiments of the present application, the hydrogen production device is not scheduled to consume electricity to produce hydrogen in the pre-established production plan. As long as its environmental parameters such as temperature and pressure meet the standards and the device is in standby mode, it can be quickly put into production. This can cope with energy fluctuations and random events in actual use, improve the reliability of the power system, and promote the solution to the difficulty of absorbing new energy (such as hydrogen energy and wind energy).

[0075] In step S4, as an example of this embodiment, an operation planning model of the hydrogen production device and an operation planning model of the power system are constructed based on the constructed constraint relationship. As another example of this embodiment, an existing operation planning model can be used, and the constraint relationship constructed in this embodiment can be added to the existing operation planning model.

[0076] This example uses a modified IEEE RTS-79 system for 24-hour scheduling. The modified IEEE RTS-79 system includes 26 thermal power units with installed capacities ranging from 12 MW to 400 MW, as well as two wind farms. The wind farm's predicted output is used as a reference. For energy storage purposes, a hydrogen energy storage system is installed locally at the wind farm. The rated input power of the hydrogen production units is [20 MW, 50 MW], respectively, and the dynamic regulation rate is set at 20% / min.

[0077] Taking into account the randomness and volatility of wind power, the fluctuation range is set to ±20% of the predicted value, that is, the actual output range of the wind farm is 80%-120% of the predicted value. The system robust optimization model is established and solved, and the thermal power operation cost is obtained to be 4.39×10 5 The system wind curtailment capacity is 46.57MWh, and the system wind curtailment rate is less than 1%. The comparative data of the modeling method of the hydrogen production device with multiple start-up processes and the modeling method without considering multiple start-up processes can be obtained, refer to Table 1:

[0078] Table 1 Comparison results of indicators

[0079]

[0080] It can be seen that this example adopts the hydrogen production device modeling method considering the multi-state startup process of this embodiment. Compared with the existing technology, it reduces the amount of wind curtailment and the operating costs of thermal power units, realizes the effective consumption of new energy, and improves the operational reliability, comprehensive utilization rate, and overall efficiency of the power system.

[0081] Accordingly, refer to Figure 3 This embodiment further provides a hydrogen production device modeling system considering a multi-state startup process, including:

[0082] An acquisition module 101 is used to acquire information required for modeling of a hydrogen production device;

[0083] A coupling module 102 is configured to construct a coupling relationship for describing the operating state of the hydrogen production device based on the information required for the modeling; wherein the operating state of the hydrogen production device includes a shutdown state, a standby state, and a hydrogen production state;

[0084] A constraint module 103 is configured to construct a constraint relationship of the hydrogen production device based on the coupling relationship; wherein the constraint relationship includes static operation constraints, start-up and shutdown constraints, ramp-up constraints, and real-time adjustment constraints;

[0085] The modeling module 104 is used to construct an operation planning model of the hydrogen production device under the constraints of the constraint relationship.

[0086] As a preferred solution, the coupling module 102 is constructed to describe the coupling relationship of the working state of the hydrogen production device, specifically:

[0087] The coupling module 102 uses 0-1 variables to describe whether the operating state parameters of the hydrogen production device meet the operating conditions, and establishes a coupling relationship between the 0-1 variables and the operating state parameters; wherein the operating state parameters include temperature, pressure and power.

[0088] As a preferred solution, the operating state parameters include α and β;

[0089] When α is 0, the environmental parameters of the hydrogen production device do not meet the operating conditions; when α is 1, the environmental parameters of the hydrogen production device meet the operating conditions;

[0090] When β is 0, the power of the hydrogen production device does not meet the operating conditions, and when β is 1, the power of the hydrogen production device meets the operating conditions.

[0091] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0092] An embodiment of the present invention provides a method and system for modeling a hydrogen production device that considers a multi-state startup process. The method includes: obtaining information required for modeling the hydrogen production device; constructing a coupling relationship for describing the operating state of the hydrogen production device based on the information required for modeling; wherein the operating state of the hydrogen production device includes a shutdown state, a standby state, and a hydrogen production state; constructing a constraint relationship for the hydrogen production device based on the coupling relationship; wherein the constraint relationship includes a static operation constraint, a startup and shutdown constraint, a ramping constraint, and a real-time adjustment constraint; and constructing an operation planning model for the hydrogen production device under the constraints of the constraint relationship. Compared with the prior art, the coupling relationship capable of describing the operating state of the hydrogen production device considers and fully describes the operating states of the hydrogen production device, such as shutdown, standby, and hydrogen production; constructing the operation planning model based on the static operation constraint, startup and shutdown constraint, ramping constraint, and real-time adjustment constraint of the hydrogen production device, solves the problem of the prior art that the dynamic adjustment characteristics of the hydrogen production process are not considered, effectively improves the operational reliability of the power system and the utilization rate of hydrogen energy, reduces hydrogen energy loss, and improves the hydrogen-to-electricity conversion rate.

[0093] The specific embodiments described above further illustrate the objectives, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A modeling method for a hydrogen production device considering a multi-state startup process, characterized in that: include: Obtain the information required for modeling the hydrogen production plant; Constructing a coupling relationship for describing the working state of the hydrogen production device based on the information required for the modeling; wherein the working state of the hydrogen production device includes a shutdown state, a standby state, and a hydrogen production state; Based on the coupling relationship, a constraint relationship of the hydrogen production device is constructed; wherein the constraint relationship includes static operation constraints, start-up and shutdown constraints, ramp constraints and real-time adjustment constraints; Under the constraints of the constraint relationship, constructing an operation planning model of the hydrogen production device; The startup and shutdown constraints are specifically: Among them, α t is the environmental parameter of the hydrogen production device at time t, is the startup action of the hydrogen production device at time t, is the closing action of the hydrogen production device at time t.

2. A hydrogen production device modeling method considering a multi-state startup process according to claim 1, characterized in that: The construction is used to describe the coupling relationship of the working state of the hydrogen production device, specifically: 0-1 variables are used to respectively describe whether the operating state parameters of the hydrogen production device meet the operating conditions, and a coupling relationship between the 0-1 variables and the operating state parameters is established; wherein the operating state parameters include temperature, pressure and power.

3. A hydrogen production device modeling method considering a multi-state startup process according to claim 2, characterized in that: The operating state parameters include α and β; When α is 0, the environmental parameters of the hydrogen production device do not meet the operating conditions; when α is 1, the environmental parameters of the hydrogen production device meet the operating conditions; When β is 0, the power of the hydrogen production device does not meet the operating conditions, and when β is 1, the power of the hydrogen production device meets the operating conditions.

4. A hydrogen production device modeling method considering a multi-state startup process according to claim 3, characterized in that: The static operation constraints are specifically: β·phy P2H min ≤phy P2H ≤β·phy P2H max ; Among them, phy P2H is the input power of the hydrogen production device, phy P2H min is the minimum input power of the hydrogen production device, phy P2H max is the maximum input electrical power of the hydrogen production device.

5. A hydrogen production device modeling method considering a multi-state startup process according to claim 1, characterized in that: The climbing constraints are specifically: in, is the input electrical power of the hydrogen production device at time t, and ramp is the ramp power of the hydrogen production device.

6. A hydrogen production device modeling method considering a multi-state startup process according to claim 3, characterized in that: The real-time adjustment constraints are specifically: |phy P2H (s)-phy P2H |≤α·adj P2H ; Among them, phy P2H is the real-time input power of the hydrogen production device, phy P2H (s) is the production plan preset by the hydrogen production device according to the predicted value, adj P2H It is the real-time adjustment rate of the hydrogen production device.

7. A hydrogen production device modeling system considering a multi-state startup process, characterized in that: include: An acquisition module is used to obtain information required for modeling the hydrogen production device; A coupling module, configured to construct a coupling relationship for describing the working state of the hydrogen production device according to the information required for the modeling; wherein the working state of the hydrogen production device includes a shutdown state, a standby state, and a hydrogen production state; A constraint module, configured to construct a constraint relationship of the hydrogen production device based on the coupling relationship; wherein the constraint relationship includes static operation constraints, start-up and shutdown constraints, ramp-up constraints, and real-time adjustment constraints; A modeling module, configured to construct an operation planning model of the hydrogen production device under the constraints of the constraint relationship; The startup and shutdown constraints are specifically: Among them, α t is the environmental parameter of the hydrogen production device at time t, is the startup action of the hydrogen production device at time t, is the closing action of the hydrogen production device at time t.

8. A hydrogen production device modeling system considering a multi-state startup process according to claim 7, characterized in that: The coupling module is constructed to describe the coupling relationship of the working state of the hydrogen production device, specifically: The coupling module uses 0-1 variables to respectively describe whether the operating status parameters of the hydrogen production device meet the operating conditions, and constructs a coupling relationship between the 0-1 variables and the operating status parameters; wherein the operating status parameters include temperature, pressure and power.

9. A hydrogen production device modeling system considering a multi-state startup process according to claim 8, characterized in that: The operating state parameters include α and β; When α is 0, the environmental parameters of the hydrogen production device do not meet the operating conditions; when α is 1, the environmental parameters of the hydrogen production device meet the operating conditions; When β is 0, the power of the hydrogen production device does not meet the operating conditions, and when β is 1, the power of the hydrogen production device meets the operating conditions.

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