Hybrid hydrogen production system power distribution method and distribution device

Abstract

The invention discloses a power distribution method and a power distribution device for a series-parallel hydrogen production system. The distribution method comprises the following steps: acquiring target absorption power input into the series-parallel hydrogen production system; multiple groups of filtering operators are introduced to disassemble the target power into first subsystem distribution power and second subsystem distribution power; judging whether the power is in a set power interval, and performing correction through compression smoothing processing; outputting the first subsystem distribution power, the second subsystem distribution power and the third subsystem distribution power; the distribution device comprises a first processing module, a second processing module and a controller. According to the method, multiple groups of filtering operators are introduced to disassemble the target power into the first subsystem distribution power and the second subsystem distribution power, correction is carried out through compression smoothing processing, and the smoothness of a power curve is effectively improved; and meanwhile, low-frequency and intermediate-frequency components are reserved as much as possible, so that the utilization rate of the corresponding subsystems is ensured, and the service life of each subsystem of the series-parallel hydrogen production system is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy, and in particular to a power distribution method and a distribution device for a hybrid hydrogen production system. Background Art

[0002] Renewable energy sources such as wind power and photovoltaic power are volatile and cannot be fully absorbed by the power grid. Common energy storage methods include pumped storage, compressed air, lead-acid batteries, lithium batteries, sodium-sulfur batteries, flow batteries, flywheel energy storage, supercapacitors, and superconducting energy storage. Energy storage strategies generally focus on one or several combinations of the above energy storage methods. And 5%-15% of the renewable energy power generation needs to be transferred across days / weeks / seasons through long-term energy storage (>10h). Among them, hydrogen energy storage, as a cross-seasonal long-term large-scale energy storage method, can effectively make up for the shortcomings of existing energy storage methods.

[0003] Currently, hydrogen energy storage generally uses alkaline electrolyzed water or proton exchange membrane electrolyzed water or a hybrid electrolysis of alkali solution / proton exchange membrane to produce hydrogen. Through the Variational Mode Decomposition (VMD) method, the target power curve is decomposed into multiple intrinsic mode functions, and then the low-frequency, medium-frequency, and high-frequency parts of the power curve are reconstructed based on these intrinsic mode functions and distributed to each subsystem. However, this method cannot take into account the requirements of each subsystem of the hybrid energy storage during the decomposition and reconstruction processes (such as the requirements of each subsystem for the fluctuation frequency of the distributed power curve, the number of start-up and shutdown times, etc.), and cannot give full play to the advantages of the alkaline electrolyzer and the proton exchange membrane electrolyzer, resulting in a low operating efficiency of the overall system and poor stability of the system. Summary of the Invention

[0004] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0005] The purpose of the present invention is to solve the deficiencies in the prior art and propose a power distribution method and a distribution device for a hybrid hydrogen production system.

[0006] To achieve the above purpose, in the first aspect, the present invention provides a power distribution method for a hybrid hydrogen production system, including:

[0007] S100, obtaining the target absorption power input into the hybrid hydrogen production system;

[0008] S200, introduce multiple groups of filtering operators to decompose the target power into the allocated power of the first subsystem and the allocated power of the second subsystem;

[0009] S300, determine whether the allocated power of the first subsystem and the allocated power of the second subsystem after decomposition are within the set power range, and correct the allocated power of the first subsystem and the allocated power of the second subsystem through compressive smoothing processing;

[0010] S400, calculate the allocated power of the third subsystem, and output the allocated power of the first subsystem, the allocated power of the second subsystem, and the allocated power of the third subsystem.

[0011] In some embodiments, the target absorption power P of the hybrid hydrogen production system is:

[0012] P = P L + P M + P H

[0013] Among them, the target absorption power P of the hybrid hydrogen production system is the renewable energy power generation minus the power fed into the grid. The allocated power P L of the first subsystem is the corresponding absorption power of the alkaline electrolytic water hydrogen production subsystem, and the allocated power P M of the second subsystem is the corresponding absorption power of the proton exchange membrane electrolytic water hydrogen production subsystem. The allocated power P H of the third subsystem is the corresponding absorption power of the battery subsystem.

[0014] In some embodiments, the allocated power P L of the first subsystem is:

[0015] P L = P * D L

[0016] The allocated power P M of the second subsystem is:

[0017] P M = P * D M

[0018] Among them, D L is the first filtering operator, and D M is the second filtering operator.

[0019] In some embodiments, the spectrum F L of the first filtering operator is:

[0020]

[0021] The spectrum F M of the second filtering operator is:

[0022]

[0023] Wherein, f is the frequency, and f1, f2, f3, and f4 are preset control parameters, where f1 < f2 < f3 < f4.

[0024] In some embodiments, step S300 includes:

[0025] S310, input the power allocated by the first subsystem, the power allocated by the second subsystem, a preset power limit range, and a preset time period;

[0026] S320, determine whether the power allocated by the first subsystem exceeds the preset power limit range. If it exceeds, correct the power allocated by the first subsystem through compressive smoothing processing, calculate the change value, and update the power allocated by the second subsystem. If it does not exceed, directly output the power allocated by the first subsystem;

[0027] S330, determine whether the power allocated by the second subsystem exceeds the preset power limit range. If it exceeds, correct the power allocated by the second subsystem through compressive smoothing processing. If it does not exceed, directly output the power allocated by the second subsystem.

[0028] In some embodiments, the preset power limit range is:

[0029] [P1, P2] and [P3, P4]

[0030] The preset time period is:

[0031] T1 and T2

[0032] Wherein, P1 is the lower limit value of the preset power limit range for the power allocated by the first subsystem, P2 is the upper limit value of the preset power limit range for the power allocated by the first subsystem, P3 is the lower limit value of the preset power limit range for the power allocated by the second subsystem, P4 is the upper limit value of the preset power limit range for the power allocated by the second subsystem, T1 is the preset time period for the power allocated by the first subsystem, and T2 is the preset time period for the power allocated by the second subsystem.

[0033] In some embodiments, step S320 includes:

[0034] S321, determine whether the power allocated by the first subsystem exceeds the preset power limit range. If it exceeds, enter S322. If it does not exceed, enter S323;

[0035] S322, determine whether the length of the time period exceeds the preset time period, and based on the judgment result, determine whether to record the time point;

[0036] Determine whether all extreme points in the extreme point sequence exceed the preset limited power range, and based on the judgment result, determine whether to reassign the extreme point sequence;

[0037] Perform interpolation operations on the extreme point sequence and the corresponding time sequence to obtain the corrected power distribution of the first subsystem;

[0038] Determine whether the corrected power distribution of the first subsystem exceeds the preset limited power range, and based on the judgment result, determine whether to re-correct;

[0039] Assign the power value corresponding to the corrected power distribution of the first subsystem to the lower limit value of the preset limited power range according to the recorded time point;

[0040] S323, output the power distribution of the first subsystem after assignment, calculate the change value of the power distribution of the first subsystem before and after compression and smoothing processing, and update the power distribution of the second subsystem.

[0041] In some embodiments, step S330 includes:

[0042] S331, determine whether the power distribution of the second subsystem exceeds the preset limited power range. If it exceeds, enter S332; if not, enter S333;

[0043] S332, determine whether the time period length exceeds the preset time period, and based on the judgment result, determine whether to record the time point;

[0044] Determine whether all extreme points in the extreme point sequence exceed the preset limited power range, and based on the judgment result, determine whether to reassign the extreme point sequence;

[0045] Perform interpolation operations on the extreme point sequence and the corresponding time sequence to obtain the corrected power distribution of the second subsystem;

[0046] Determine whether the corrected power distribution of the second subsystem exceeds the preset limited power range, and based on the judgment result, determine whether to re-correct;

[0047] Assign the power value corresponding to the corrected power distribution of the second subsystem to the lower limit value of the preset limited power range according to the recorded time point;

[0048] S333, output the power distribution of the second subsystem after assignment.

[0049] In a second aspect, the present invention further provides a power distribution device for a hybrid hydrogen production system. The hybrid hydrogen production system includes an alkaline electrolytic water hydrogen production subsystem, a proton exchange membrane electrolytic water hydrogen production subsystem, and a battery subsystem, and is used to operate the power distribution method for the hybrid hydrogen production system as described in the first aspect. The distribution device includes:

[0050] The first processing module is used to obtain the renewable energy power generation and the power of the grid-connected part, and calculate the target absorption power.

[0051] The second processing module is used to introduce multiple groups of filtering operators to decompose the target power into the allocated power of the first subsystem and the allocated power of the second subsystem, correct the allocated power of the first subsystem and the allocated power of the second subsystem through compressive smoothing processing, calculate the allocated power of the third subsystem, and output the allocated power of the first subsystem, the allocated power of the second subsystem and the allocated power of the third subsystem.

[0052] In some embodiments, the distribution device further includes:

[0053] A controller, which is electrically connected to the alkaline electrolytic water hydrogen production subsystem, the proton exchange membrane electrolytic water hydrogen production subsystem and the battery subsystem respectively. The controller is used to control the switches of all subsystems of the hybrid hydrogen production system and distribute power.

[0054] The present invention has the following beneficial effects:

[0055] 1. In the present invention, according to the requirements of each subsystem of the hybrid hydrogen production system, the low-frequency, medium-frequency and high-frequency power components are gradually decomposed. The parameters required for decomposition are related to the physical characteristics of the subsystem. The calculation steps are simple, the self-adaptability is strong, and the applicability is wide.

[0056] 2. In the present invention, multiple groups of filtering operators are introduced to decompose the target power into the allocated power of the first subsystem and the allocated power of the second subsystem; it is judged whether it is in the set power interval and corrected through compressive smoothing processing, effectively improving the smoothness of the power curve; at the same time, as many low-frequency and medium-frequency components as possible are retained, thereby ensuring that the utilization rate of the corresponding subsystems is improved, and the service life of each subsystem of the hybrid hydrogen production system is extended.

[0057] 3. In the present invention, the power value corresponding to the corrected first subsystem is assigned to the lower limit value of the preset power limit interval according to the recorded time point, which can effectively ensure that in the case of long-term low-power input of wind power, the alkaline electrolytic water subsystem or the proton exchange membrane electrolytic water subsystem can remain in the shutdown state and will not continuously draw electrical energy from the battery subsystem to maintain low-power operation, thereby effectively reducing the operating load of the battery subsystem. Description of the Drawings

[0058] Figure 1 is the flow chart of the power distribution method of the hybrid hydrogen production system proposed by the present invention Figure 1 ;

[0059] Figure 2 is the flow chart of the power distribution method of the hybrid hydrogen production system proposed by the present invention Figure 2 ;

[0060] Figure 3 Flow chart of the power distribution method for the hybrid hydrogen production system proposed by the present invention Figure 3 ;

[0061] Figure 4 Flow chart of the power distribution method for the hybrid hydrogen production system proposed by the present invention Figure 4 ;

[0062] Figure 5 Schematic diagram of the power distribution device for the hybrid hydrogen production system proposed by the present invention;

[0063] Figure 6 Power distribution schematic of the power distribution device for the hybrid hydrogen production system proposed by the present invention;

[0064] Figure 7 Power distribution schematic of wind power in the hybrid hydrogen production system Figure 1 ;

[0065] Figure 8 Power distribution schematic of wind power in the hybrid hydrogen production system Figure 2 。

[0066] Figure 9 Power distribution schematic of wind power in the hybrid hydrogen production system Figure 3 。

[0067] Figure 10 Power distribution schematic of wind power in the hybrid hydrogen production system Figure 4 。

[0068] Legend:

[0069] 1. Hybrid hydrogen production system; 11. Alkaline electrolytic water hydrogen production subsystem; 12. Proton exchange membrane electrolytic water hydrogen production subsystem; 13. Battery subsystem; 2. Distribution device; 21. First processing module; 22. Second processing module; 23. Controller. Detailed implementation manners

[0070] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0071] An embodiment of the present application provides a power distribution method and device for a hybrid hydrogen production system, which solves the problem that in the prior art, through the Variational Mode Decomposition (VMD) method, the target power curve is decomposed into multiple Intrinsic Mode Functions, and then based on these Intrinsic Mode Functions, the low-frequency, intermediate-frequency, and high-frequency parts of the power curve are reconstructed and then distributed to each subsystem. However, this method cannot take into account the requirements of each subsystem of the hybrid energy storage (such as the fluctuation frequency requirements of the power curve assigned to each subsystem, the number of start-up and shutdown times, etc.) during the decomposition and reconstruction process, and cannot give full play to the advantages of alkaline electrolyzers and proton exchange membrane electrolyzers, resulting in a low operating efficiency of the overall system and poor system stability. In contrast, the present application gradually decomposes the low-frequency, intermediate-frequency, and high-frequency power components according to the requirements of each subsystem of the hybrid hydrogen production system. The parameters required for decomposition are related to the physical characteristics of the subsystem, and the calculation steps are simple, with strong self-adaptability and wide applicability; by introducing multiple sets of filtering operators, the target power is disassembled into the power assigned to the first subsystem and the power assigned to the second subsystem, and it is judged whether it is within the set power interval, and correction is performed through compressive smoothing processing, effectively improving the smoothness of the power curve; at the same time, as many low-frequency and intermediate-frequency components as possible are retained, thereby ensuring that the service life of each subsystem corresponding to it is increased, and the service life of each subsystem of the hybrid hydrogen production system is improved.

[0072] For specific details, please refer to the following embodiments:

[0073] Refer to Figures 1-4 , an embodiment of a power distribution method for a hybrid hydrogen production system provided by the present invention, the specific structure includes:

[0074] S100, obtaining the target absorbed power input to the hybrid hydrogen production system;

[0075] S200, introducing multiple sets of filtering operators to disassemble the target power into the power assigned to the first subsystem and the power assigned to the second subsystem;

[0076] S300, judging whether the power assigned to the first subsystem and the power assigned to the second subsystem after disassembly are within the set power interval, and correcting the power assigned to the first subsystem and the power assigned to the second subsystem through compressive smoothing processing;

[0077] S400, calculating the power assigned to the third subsystem, and outputting the power assigned to the first subsystem, the power assigned to the second subsystem, and the power assigned to the third subsystem.

[0078] It should be noted in detail that the target absorbed power P of the hybrid hydrogen production system is:

[0079] P = P L + P M + P H

[0080] Among them, the target consumption power P of the hybrid hydrogen production system is the renewable energy power generation minus the power fed into the grid, and the power distribution P of the first subsystem L is the corresponding consumption power of the alkaline water electrolysis hydrogen production subsystem, and the power distribution P of the second subsystem M is the corresponding consumption power of the proton exchange membrane water electrolysis hydrogen production subsystem, and the power distribution P of the third subsystem H is the corresponding consumption power of the battery energy storage subsystem.

[0081] Furthermore, the power distribution P of the first subsystem L is:

[0082] P L = P * D L

[0083] Similarly, the power distribution P of the second subsystem M is:

[0084] P M = P * D M

[0085] where D L is the first filtering operator, and D M is the second filtering operator.

[0086] The spectrum F of the first filtering operator L is designed as:

[0087]

[0088] The spectrum F of the second filtering operator M is designed as:

[0089]

[0090] where f is the frequency, and f1, f2, f3, f4 are preset control parameters, and f1 < f2 < f3 < f4.

[0091] Exemplarily, assume that the main frequency of the power fluctuation required by the alkaline water electrolysis hydrogen production subsystem is f L , and the main frequency of the power fluctuation required by the proton exchange membrane water electrolysis hydrogen production subsystem is f M , f L and f M are then adjusted according to the actual operating conditions of the subsystem, which is related to the dynamic response time of the system. In this embodiment, f1 = f L , f3 = f M ,

[0092] Please continue to refer to Figure 2, in this embodiment, step S300 includes:

[0093] S310, input the power allocated to the first subsystem, the power allocated to the second subsystem, the preset power limit range, and the preset time period;

[0094] S320, determine whether the power allocated to the first subsystem exceeds the preset power limit range. If it exceeds, correct the power allocated to the first subsystem through compressive smoothing processing, calculate the change value, and update the power allocated to the second subsystem. If it does not exceed, directly output the power allocated to the first subsystem;

[0095] S330, determine whether the power allocated to the second subsystem exceeds the preset power limit range. If it exceeds, correct the power allocated to the second subsystem through compressive smoothing processing. If it does not exceed, directly output the power allocated to the second subsystem.

[0096] It should be noted in detail that the preset power limit range is:

[0097] [P1, P2] and [P3, P4]

[0098] The preset time period is:

[0099] T1 and T2

[0100] Among them, P1 is the lower limit value of the preset power limit range for the power allocated to the first subsystem, P2 is the upper limit value of the preset power limit range for the power allocated to the first subsystem, P3 is the lower limit value of the preset power limit range for the power allocated to the second subsystem, and P4 is the upper limit value of the preset power limit range for the power allocated to the second subsystem. In addition, T1 is the preset time period for the power allocated to the first subsystem, and T2 is the preset time period for the power allocated to the second subsystem.

[0101] Please continue to refer to Figure 3 , in this embodiment, step S320 includes:

[0102] S321, determine whether the power allocated to the first subsystem exceeds the preset power limit range. If it exceeds, enter S322; if it does not exceed, enter S323;

[0103] S322, determine whether the time period length exceeds the preset time period, and determine whether to record the time point based on the judgment result;

[0104] Determine whether all extreme points of the extreme point sequence exceed the preset power limit range, and determine whether to reassign the extreme point sequence based on the judgment result;

[0105] Perform interpolation operations on the extreme point sequence and the corresponding time sequence to obtain the corrected power allocated to the first subsystem;

[0106] Judge whether the allocated power of the corrected first subsystem exceeds the preset power limit interval, and judge whether to correct it again based on the judgment result;

[0107] Assign the power value corresponding to the corrected first subsystem to the lower limit value of the preset power limit interval according to the recording time point;

[0108] S323, output the allocated power of the first subsystem after assignment, calculate the change value of the allocated power of the first subsystem before and after compression and smoothing processing, and update the allocated power of the second subsystem.

[0109] Exemplarily, first, read the input allocated power P of the first subsystem L (P L is a function P of time t L (t)), and set the preset power limit interval ([P1, P2]);

[0110] Secondly, judge whether the allocated power P of the first subsystem L exceeds the preset power limit interval [P1, P2]. If it exceeds, correct the allocated power of the first subsystem through compression and smoothing processing, including:

[0111] (a) Obtain all time points t of the allocated power P of the first subsystem L that are lower than the lower limit value P1 of the power limit interval [P1, P2], and accumulate and sum them to obtain the time period length T i , judge whether the time period length exceeds the preset time period T1, and judge whether to record the time point t based on the judgment result i : i :

[0112] It should be noted in detail that these time points include several time periods of different lengths, and the accumulated sum can obtain the time period length. If the time period length T i exceeds the preset time period T1 (unit: second), then record the time points t corresponding to these time periods i ;

[0113] (b) Obtain all extreme points of the allocated power P of the first subsystem L , form an extreme point sequence X and the corresponding time sequence Y (i.e., [X, Y] sequence, Y is the extreme point value, unit: power; X is the time corresponding to the extreme point, unit: second), judge whether all extreme points of the extreme point sequence exceed the preset power limit interval, and judge whether to reassign the extreme point sequence based on the judgment result:

[0114] It should be noted in detail that if the extreme points of the extreme point sequence X exceed the preset limited power range [P1, P2], the extreme points are re-assigned, that is, the minimum extreme point is assigned P1, and the maximum extreme point is assigned P2; otherwise, the size of the extreme point remains unchanged; thus, a new extreme point sequence X and the corresponding time sequence Y can be obtained;

[0115] (c) For the new extreme point sequence X and the corresponding time sequence Y, allocate power P according to the input first subsystem L of the sampling interval, and perform interpolation operations (such as cubic spline interpolation) on the new extreme point sequence X and the corresponding time sequence Y to obtain the corrected first subsystem allocated power P L ;

[0116] Again, judge again whether the corrected first subsystem allocated power P L exceeds the preset limited power range [P1, P2], and judge whether to re-correct based on the judgment result:

[0117] It should be noted in detail that if the corrected first subsystem allocated power P L still has values exceeding the preset limited power range [P1, P2], then repeat the operations of the above (a) to (c) compression and smoothing processing (the number of repetitions of this operation is generally 1-3 times to meet the conditions, and the computational burden on the overall algorithm is not large);

[0118] Next, according to the recorded time point t i assign the power value corresponding to the corrected first subsystem allocated power P L to the lower limit value of the preset limited power range;

[0119] Subsequently, output the assigned first subsystem allocated power P L , calculate the change value of the first subsystem allocated power before and after the compression and smoothing processing, and update the second subsystem allocated power:

[0120] It should be noted in detail that the change value ΔP of the first subsystem allocated power before and after the compression and smoothing processing L is equal to the input value minus the assigned value, and the first subsystem allocated power change value ΔP L and the second subsystem allocated power P M are added to form a new second subsystem allocated power P M .

[0121] Please continue to refer to Figure 4 , in this embodiment, step S330 includes:

[0122] S331. Determine whether the power allocated to the second subsystem exceeds the preset power limit range. If it exceeds, proceed to S332; if not, proceed to S333.

[0123] S332. Determine whether the length of the time period exceeds the preset time period, and based on the judgment result, determine whether to record the time point.

[0124] Determine whether all extreme points in the extreme point sequence exceed the preset power limit range, and based on the judgment result, determine whether to reassign the extreme point sequence.

[0125] Perform interpolation operations on the extreme point sequence and the corresponding time sequence to obtain the corrected power allocated to the second subsystem.

[0126] Determine whether the corrected power allocated to the second subsystem exceeds the preset power limit range, and based on the judgment result, determine whether to re-correct.

[0127] Assign the power value corresponding to the corrected second subsystem to the lower limit value of the preset power limit range according to the recorded time point.

[0128] S333. Output the power allocated to the second subsystem after assignment.

[0129] Exemplarily, first, read the input power P allocated to the second subsystem M (P M which is a function of time t, P M (t)), and set the preset power limit range ([P3, P4]) and the preset time period (T2).

[0130] Second, determine whether the power P allocated to the second subsystem M exceeds the preset power limit range [P3, P4]. If it exceeds, correct the power allocated to the second subsystem through compression and smoothing processing, including:

[0131] (d) Obtain all time points t at which the power P allocated to the second subsystem M is lower than the lower limit value P3 of the power limit range [P3, P4], i accumulate and sum them to obtain the length T of the time period, i determine whether the length of the time period exceeds the preset time period T2, and based on the judgment result, determine whether to record the time point t i :

[0132] It should be noted in detail that these time points include several time periods of unequal lengths, and the accumulated sum can obtain the length of the time period. If the length of the time period T i exceeds the preset time period T2 (unit: second), then record the time points t corresponding to these time periods i ;

[0133] (e) Obtain the allocated power P of the second subsystem M All extreme points form an extreme point sequence X and the corresponding time sequence Y (i.e., [X, Y] sequence, Y is the value of the extreme point, unit: power; X is the time corresponding to the extreme point, unit: second). Determine whether all extreme points in the extreme point sequence exceed the preset power interval. Based on the judgment result, determine whether to reassign values to the extreme point sequence:

[0134] It should be noted in detail that if the extreme points of the extreme point sequence X exceed the preset power interval [P3, P4], then reassign values to the extreme points, that is, assign the minimum extreme point as P3 and the maximum extreme point as P4; otherwise, the size of the extreme point remains unchanged; thus, a new extreme point sequence X and the corresponding time sequence Y can be obtained;

[0135] (f) For the new extreme point sequence X and the corresponding time sequence Y, according to the input allocated power P of the second subsystem M of the sampling interval, use interpolation operations (such as cubic spline interpolation) to interpolate the new extreme point sequence X and the corresponding time sequence Y to obtain the corrected allocated power P of the second subsystem M ;

[0136] Again, determine whether the corrected allocated power P of the second subsystem M exceeds the preset power interval [P3, P4], and based on the judgment result, determine whether to re-correct:

[0137] It should be noted in detail that if the corrected allocated power P of the second subsystem M still has values exceeding the preset power interval [P3, P4], then repeat the operations of the compression and smoothing process in (d) - (f) above;

[0138] Next, according to the recorded time point t i assign the power value corresponding to the corrected allocated power P of the second subsystem M as the lower limit value of the preset power interval;

[0139] Subsequently, output the allocated power P of the second subsystem after assignment M , and calculate the change value ΔP of the allocated power of the second subsystem before and after the compression and smoothing process M :

[0140] It should be noted in detail that the change value ΔP of the allocated power of the second subsystem before and after the compression and smoothing process M is equal to the input value minus the assigned value.

[0141] Refer to Figures 5-6, the present invention also provides an embodiment of a power distribution device for a hybrid hydrogen production system. The hybrid hydrogen production system (1) includes an alkaline electrolytic water hydrogen production subsystem (11), a proton exchange membrane electrolytic water hydrogen production subsystem (12), and a battery subsystem (13), and is used to operate the power distribution method of the hybrid hydrogen production system in the above embodiment. The distribution device (2) includes:

[0142] A first processing module (21), which is used to obtain the renewable energy power generation power and the power fed into the grid, and calculate the target consumption power;

[0143] A second processing module (22), which is used to introduce multiple groups of filtering operators to decompose the target power into the power allocated to the first subsystem and the power allocated to the second subsystem, correct the power allocated to the first subsystem and the power allocated to the second subsystem through compression and smoothing processing, calculate the power allocated to the third subsystem, and output the power allocated to the first subsystem, the power allocated to the second subsystem, and the power allocated to the third subsystem.

[0144] It further includes a controller (23), which is electrically connected to the alkaline electrolytic water hydrogen production subsystem, the proton exchange membrane electrolytic water hydrogen production subsystem, and the battery subsystem respectively. The controller is used to control the switches and the allocated power of all subsystems of the hybrid hydrogen production system.

[0145] In the embodiment of the present application, a hybrid hydrogen production system composed of an alkaline electrolytic water hydrogen production subsystem, proton exchange membrane electrolytic water hydrogen production, and a battery is taken as an example. Among them, the alkaline electrolytic water hydrogen production subsystem undertakes the energy-type load function (that is, consumes the low-frequency part of the target power); the proton exchange membrane electrolytic water hydrogen production subsystem undertakes the power / energy-type load function (that is, consumes the intermediate-frequency part of the target power); the battery subsystem undertakes the power-type function (that is, consumes the high-frequency part of the target power).

[0146] The power distribution of the hybrid hydrogen production system is shown in Figure 6 , where:

[0147] P is the target power that the hybrid hydrogen production system needs to consume, P L is the power allocated to the alkaline electrolytic water hydrogen production subsystem (low-frequency part, large amplitude), P M is the power allocated to the proton exchange membrane electrolytic water hydrogen production subsystem (intermediate-frequency part, relatively large amplitude), P H is the power allocated to the battery subsystem (high-frequency part, small amplitude, generally oscillating near zero).

[0148] Please continue to refer to Figures 7-10 , for the power distribution of wind power in the hybrid energy storage system:

[0149] (1) The original signal is the wind power curve, with values ranging from 0 to 250 kW and a relatively wide frequency component. It needs to be decomposed and then input to each energy storage subsystem;

[0150] (2) Decompose the original signal according to the Figures 1-4 steps shown to obtain the low-frequency component (dashed line) and the intermediate-frequency component (dashed line). However, their values still exceed the power ranges [0, 200] and [0, 25] required by the alkaline electrolytic water hydrogen production subsystem and the proton exchange membrane electrolytic water hydrogen production subsystem;

[0151] (3) Perform correction processing on the low-frequency component (dashed line) and the intermediate-frequency component (dashed line) according to the Figures 1-4 steps shown to obtain the corrected low-frequency component (solid line) and the intermediate-frequency component (solid line); it can be seen that, compared with before correction, the corrected low-frequency component (solid line) and the intermediate-frequency component (solid line) can control the power values within the limited range and can maintain the smoothness of the curve before correction;

[0152] (4) Subtract the corrected low-frequency component (solid line) and the intermediate-frequency component (solid line) from the original signal to obtain the high-frequency component;

[0153] (5) Input the corrected low-frequency component (solid line), the intermediate-frequency component (solid line), and the high-frequency component (solid line) to the alkaline electrolytic water hydrogen production subsystem, the proton exchange membrane electrolytic water hydrogen production subsystem, and the battery subsystem respectively, and the complete consumption of wind power can be achieved.

[0154] Through the above technical solution, the present application gradually decomposes the low-frequency, intermediate-frequency, and high-frequency power components according to the requirements of each subsystem of the hybrid hydrogen production system. The parameters required for decomposition are related to the physical characteristics of the subsystem (i.e., the main frequency of power fluctuation that can be accepted, the fluctuation range, etc.). Adaptive band-pass filtering with the physical characteristics of each subsystem as a constraint adaptively decomposes the power generation curve of fluctuating renewable energy (not limited to the wind energy in the embodiment) into power components of different frequency bands. The calculation is simple and easy to operate, and it has self-adaptability;

[0155] In addition, when the conventional method directly flattens the smooth peaks and valleys of the power curve, it will seriously affect the smoothness of the power curve and will frequently increase the number of start-stop times, resulting in the service life of each subsystem of the hybrid energy storage; while the present application disassembles the target power into the power allocated to the first subsystem and the power allocated to the second subsystem by introducing multiple groups of filtering operators, judges whether it is within the set power range, and corrects it through compression and smoothing processing, effectively improving the smoothness of the power curve;

[0156] Another conventional method is to retain the smoothness of the power curve through equal-proportion compression processing, with its maximum and minimum values being the upper and lower limits of the power interval required by the subsystem. Although this approach can meet the power interval requirements, generally, the values of the power curve fluctuate significantly on the time scale, which easily leads to excessive compression of the power values in certain time periods. In contrast, this application retains as many low-frequency and intermediate-frequency components as possible, thereby ensuring that the utilization rate of the corresponding subsystem increases the service life of each subsystem in the hybrid hydrogen production system.

[0157] In addition, the operation of assigning the power value corresponding to the corrected first subsystem to the lower limit value of the preset power interval at the recorded time point can control its value within the power interval required by each subsystem in the case of large fluctuations in the power curve, taking into account its waveform smoothness and the shutdown requirement under long-term low-power input. It can effectively ensure that in the case of long-term low-power input of wind power, the alkaline electrolyzed water subsystem or the proton exchange membrane electrolyzed water subsystem can remain in the shutdown state and will not continuously draw electrical energy from the battery subsystem to maintain low-power operation, thereby effectively reducing the operating load of the battery subsystem.

[0158] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power distribution method for a hybrid hydrogen production system, the hybrid hydrogen production system comprising an alkaline electrolytic water hydrogen production subsystem, a proton exchange membrane electrolytic water hydrogen production subsystem, and a storage battery subsystem, characterized in that, The power distribution method includes: S100. Obtain the target absorption power of the input hybrid hydrogen production system; S200. Introduce multiple groups of filtering operators to decompose the target power into the first subsystem distribution power and the second subsystem distribution power; S300. Determine whether the decomposed first subsystem distribution power and the second subsystem distribution power are within the set power interval, and correct the first subsystem distribution power and the second subsystem distribution power through compressive smoothing processing; S400. Calculate the third subsystem distribution power, and output the first subsystem distribution power, the second subsystem distribution power, and the third subsystem distribution power.

2. The power distribution method of the hybrid hydrogen production system according to claim 1, characterized in that The target absorption power P of the hybrid hydrogen production system is: P = P L + P M + P H Among them, the target absorption power P of the hybrid hydrogen production system is the renewable energy power generation minus the power fed into the grid, and the power distribution P L of the first subsystem is the corresponding absorption power of the alkaline electrolytic water hydrogen production subsystem, and the power distribution P M of the second subsystem is the corresponding absorption power of the proton exchange membrane electrolytic water hydrogen production subsystem, and the power distribution P H of the third subsystem is the corresponding absorption power of the battery subsystem.

3. The power distribution method of the hybrid hydrogen production system according to claim 2, characterized in that, The first subsystem allocates power P L as follows: P L = P * D L The second subsystem allocates power P M as follows: P M = P * D M Among them, D L is the first filtering operator, and D M is the second filtering operator.

4. The power distribution method of the hybrid hydrogen production system according to claim 3, characterized in that The spectrum F of the first filtering operator L is as follows: The spectrum F of the second filtering operator M is as follows: where f is the frequency, and f1, f2, f3, and f4 are preset control parameters, where f1 < f2 < f3 < f4.

5. The power distribution method of the hybrid hydrogen production system according to claim 1, characterized in that, Step S300 includes: S310. Input the first subsystem distribution power, the second subsystem distribution power, the preset limit power interval, and the preset time period; S320. Determine whether the first subsystem distribution power exceeds the preset limit power interval. If it exceeds, correct the first subsystem distribution power through compressive smoothing processing, calculate the change value, and update the second subsystem distribution power. If it does not exceed, directly output the first subsystem distribution power; S330. Determine whether the second subsystem distribution power exceeds the preset limit power interval. If it exceeds, correct the second subsystem distribution power through compressive smoothing processing. If it does not exceed, directly output the second subsystem distribution power.

6. The power distribution method of the hybrid hydrogen production system according to claim 5, wherein The preset limit power interval is: [P1, P2] and [P3, P4] The preset time period is: T1 and T2 where P1 is the lower limit value of the preset limit power interval of the first subsystem distribution power, P2 is the upper limit value of the preset limit power interval of the first subsystem distribution power, P3 is the lower limit value of the preset limit power interval of the second subsystem distribution power, P4 is the upper limit value of the preset limit power interval of the second subsystem distribution power, T1 is the preset time period of the first subsystem distribution power, and T2 is the preset time period of the second subsystem distribution power.

7. The power distribution method of the hybrid hydrogen production system according to claim 5, characterized in that Step S320 includes: S321. Determine whether the first subsystem distribution power exceeds the preset limit power interval. If it exceeds, enter S322. If it does not exceed, enter S323; S322. Determine whether the time period length exceeds the preset time period, and determine whether to record the time point based on the judgment result; Determine whether all extreme points of the extreme point sequence exceed the preset limit power interval, and determine whether to reassign the extreme point sequence based on the judgment result; Perform interpolation operation on the extreme point sequence and the corresponding time sequence to obtain the corrected first subsystem distribution power; Determine whether the corrected first subsystem distribution power exceeds the preset limit power interval, and determine whether to re-correct based on the judgment result; Assign the power value corresponding to the corrected first subsystem distribution power to the lower limit value of the preset limit power interval according to the recorded time point; S323. Output the assigned first subsystem distribution power, calculate the change value of the first subsystem distribution power before and after compressive smoothing processing, and update the second subsystem distribution power.

8. The power distribution method of the hybrid hydrogen production system according to claim 5, wherein Step S330 includes: S331. Determine whether the power allocated by the second subsystem exceeds the preset power limit range. If it exceeds, proceed to S332; if not, proceed to S333. S332. Determine whether the length of the time period exceeds the preset time period, and based on the judgment result, determine whether to record the time point. Determine whether all extreme points of the extreme point sequence exceed the preset power limit range, and based on the judgment result, determine whether to reassign the extreme point sequence. Perform interpolation operations on the extreme point sequence and the corresponding time sequence to obtain the corrected power allocated by the second subsystem. Determine whether the corrected power allocated by the second subsystem exceeds the preset power limit range, and based on the judgment result, determine whether to re-correct. Assign the power value corresponding to the corrected power allocated by the second subsystem to the lower limit value of the preset power limit range according to the recorded time point. S333. Output the power allocated by the second subsystem after assignment.

9. A power distribution device for a hybrid hydrogen production system, the hybrid hydrogen production system comprising an alkaline electrolytic water hydrogen production subsystem, a proton exchange membrane electrolytic water hydrogen production subsystem, and a storage battery subsystem, characterized in that, The allocation device is used to run the power allocation method of the hybrid hydrogen production system according to any one of claims 1 to 8. The allocation device includes: A first processing module, which is used to obtain the renewable energy power generation and the power of the grid-connected part, and calculate the target absorption power. A second processing module, which is used to introduce multiple sets of filtering operators to decompose the target power into the power allocated by the first subsystem and the power allocated by the second subsystem, correct the power allocated by the first subsystem and the power allocated by the second subsystem through compression and smoothing processing, calculate the power allocated by the third subsystem, and output the power allocated by the first subsystem, the power allocated by the second subsystem, and the power allocated by the third subsystem.

10. The power distribution device of the hybrid hydrogen production system according to claim 9, characterized in that, The allocation device further includes: A controller, which is electrically connected to the alkaline electrolytic water hydrogen production subsystem, the proton exchange membrane electrolytic water hydrogen production subsystem, and the battery subsystem respectively. The controller is used to control the switches and the allocated power of all subsystems of the hybrid hydrogen production system.

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