Wind power hydrogen production system and control method thereof, terminal equipment and storage medium

Abstract

The invention relates to the technical field of wind power hydrogen production systems, and discloses a wind power hydrogen production system and a control method thereof, terminal equipment and a storage medium, the system comprises a wind power generation module, a rectifier module, a power conversion module, an electrolytic cell module and a control module, the wind power generation module is used for converting wind energy into an alternating current signal; the rectification module converts the signals into direct current signals; the power conversion module comprises at least one power conversion unit, and each power conversion unit is used for adjusting the direct-current electric signal according to the corresponding control signal and outputting the direct-current electric signal to the corresponding electrolytic bath for water electrolysis hydrogen production; the control module is used for obtaining available power of the wind power generation module according to the ripple frequency of the direct current signal, determining input voltage corresponding to each electrolytic cell according to the available power, generating corresponding control signals based on the input voltage, and sending the control signals to the power conversion units correspondingly connected with the electrolytic cells. The system stability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power hydrogen production systems, and in particular to a wind power hydrogen production system, a control method thereof, a terminal device and a storage medium. BACKGROUND

[0002] With the rapid development of renewable energy, wind power as a clean energy in the global energy structure presents a continuous growth trend. At present, wind power generation technology has become mature, and the installed capacity of wind farms is continuously expanding, making important contributions to the construction of green energy supply system. At the same time, water electrolysis hydrogen production technology as an effective way of converting electrical energy into chemical energy has received widespread attention in recent years and is considered as one of the important ways to realize energy storage and conversion. In the prior art, the electrical energy generated by the wind turbine is directly delivered to the electrolytic cell for water electrolysis reaction. However, the electrolytic cell requires stable input power to ensure the electrolysis efficiency and safe operation.

[0003] However, the inherent natural characteristics of wind energy resources determine that its output power has significant intermittent and fluctuating characteristics. The random changes in wind speed will cause the wind turbine output power to fluctuate greatly in a short time, and such power fluctuations will be directly transmitted to the electrolytic cell system coupled therewith. When the wind power suddenly decreases, it may cause the electrolytic cell system to deviate from the optimal operating point, and even trigger the protection mechanism and shut down. In the case of power surge, it may cause waste of electrical energy or additional stress on system equipment. Therefore, the fluctuation of wind power brings great challenges to the safe, stable and efficient operation of the electrolytic cell coupled therewith. SUMMARY

[0004] Therefore, the purpose of the embodiments of the present application is to overcome the deficiencies in the prior art, and to provide a wind power hydrogen production system, a control method thereof, a terminal device and a storage medium.

[0005] In a first aspect, the embodiments of the present application provide a wind power hydrogen production system, which comprises: a wind power generation module for converting wind energy into an alternating current signal; a rectification module connected to the output end of the wind power generation module for rectifying the alternating current signal to obtain a direct current signal; a power conversion module comprising at least one power conversion unit, the input end of each power conversion unit being connected to the output end of the rectification module, for adjusting the direct current signal according to a corresponding control signal to obtain an adjusted electrical signal; an electrolytic cell module comprising at least one electrolytic cell, each electrolytic cell being connected to a corresponding power conversion unit, for using the adjusted electrical signal of the corresponding power conversion unit to electrolyze water to produce hydrogen; The control module is configured to obtain available power of the wind power generation module according to a ripple frequency of the direct-current signal, determine input voltages corresponding to the electrolytic cells according to the available power, generate the control signals corresponding to the electrolytic cells based on the input voltages, and send the control signals to the power conversion units connected to the electrolytic cells, respectively.

[0006] In some embodiments, the system further comprises: The energy storage module is configured to be connected to the output end of the rectifier module through the power conversion unit, and is configured to charge the energy storage when the available power is greater than total demand power of the electrolytic cell module, and output electric energy through the power conversion unit when the available power is less than the total demand power. In some embodiments, the power conversion unit is a stacked interleaved step-down converter, comprising two filter branches and two bridge arm units connected in parallel, two ends of the two bridge arm units are configured to be connected to the output end of the rectifier module, and middle nodes of the two bridge arm units are configured to be connected to one of the filter branches, and an output end of each filter branch is configured to be connected to a corresponding electrolytic cell. Each bridge arm unit has the same structure and comprises two switching tubes connected in series, and each switching tube is connected in anti-phase with a diode in parallel. In a second aspect, the embodiments of the present application provide a control method of a wind power hydrogen production system, which is applied to the wind power hydrogen production system of the first aspect, and the method comprises the following steps: Obtaining a ripple frequency in a direct-current signal, and determining a rotating speed of the wind power generation module according to the ripple frequency; Combining a characteristic mapping model of the wind power generation module, and determining available power of the wind power generation module according to the rotating speed; Determining input voltages corresponding to the electrolytic cells according to the available power, generating the control signals corresponding to the electrolytic cells based on the input voltages, and sending the control signals to the power conversion units connected to the electrolytic cells, respectively. In some embodiments, the step of obtaining the ripple frequency in the direct-current signal and determining the rotating speed of the wind power generation module according to the ripple frequency comprises the following steps: Obtaining a voltage ripple signal from the direct-current signal; Performing shaping processing on the voltage ripple signal to generate a pulse signal with a fixed pulse width; Determining the rotating speed of the wind power generation module based on a difference between the pulse signal and a logic conversion signal of the pulse signal. In some embodiments, the available power is maximum power corresponding to a current wind speed, and the step of generating the input voltages corresponding to the electrolytic cells according to the available power comprises the following steps: Determining a number of electrolytic cells to be put into operation based on a relationship between the maximum power and rated power of the electrolytic cells. when the maximum power and the rated power of a single electrolytic cell satisfy an integer multiple relationship, outputting a control signal corresponding to a rated voltage to each electrolytic cell in operation; when there is a non-integer multiple part between the maximum power and the rated power, obtaining a voltage signal of the electrolytic cell matched with the remaining power part according to an electrolytic cell voltage-power mapping model, and generating a control signal corresponding to the voltage signal to control the corresponding power conversion unit to output an adaptive voltage. In some embodiments, if the available power is greater than the total demand power of the electrolytic cell module, output a corresponding control signal to the power conversion unit connected to the energy storage module to charge the energy storage module.

[0007] In some embodiments, the electrolytic cell voltage-power mapping model is fitted by a second-order polynomial based on different powers of the electrolytic cell and their corresponding voltage values.

[0008] In a third aspect, an embodiment of the present application provides a terminal device, comprising a processor and a memory, the memory storing a computer program, and the processor being configured to execute the computer program to implement the steps of the control method of the wind power hydrogen production system according to the second aspect.

[0009] In a fourth aspect, an embodiment of the present application provides a computer readable storage medium storing a computer program, and the computer program is executed by a processor to implement the steps of the control method of the wind power hydrogen production system according to the second aspect.

[0010] Embodiments of the present application have the following beneficial effects: The system of the embodiments of the present application comprises a wind power generation module, a rectification module, a power conversion module, an electrolytic cell module, and a control module. The wind power generation module is configured to convert wind energy into an alternating current signal. The rectification module is configured to convert the alternating current signal into a direct current signal. The power conversion module comprises at least one power conversion unit, each power conversion unit being configured to adjust the direct current signal according to a corresponding control signal and output the adjusted direct current signal to a corresponding electrolytic cell for electrolysis of water to produce hydrogen. The control module is configured to obtain available power of the wind power generation module according to a ripple frequency of the direct current signal, determine input voltages corresponding to each electrolytic cell according to the available power, generate corresponding control signals based on the input voltages, and send the control signals to the power conversion units connected to the electrolytic cells, respectively. The system indirectly obtains the rotational speed and available power of the wind power generation module by detecting the ripple frequency of the direct current signal, dynamically adjusts the control signals of the power conversion units providing power to the electrolytic cells, matches the power consumption of the electrolytic cells with the wind power output, and improves the stability and adaptability of the system operation. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as limiting the scope. All other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present application are within the scope of protection of the present application.

[0012] Figure 1 A first structural schematic diagram of a wind power hydrogen production system according to an embodiment of the present application is shown; Figure 2 A circuit schematic diagram of a power conversion unit according to an embodiment of the present application is shown; Figure 3 A first flow schematic diagram of a control method of a wind power hydrogen production system according to an embodiment of the present application is shown; Figure 4 A second flow schematic diagram of a control method of a wind power hydrogen production system according to an embodiment of the present application is shown; Figure 5 A schematic diagram of a curve showing the variation of power with rotational speed corresponding to different wind speeds according to an embodiment of the present application is shown; Figure 6 A third flow schematic diagram of a control method of a wind power hydrogen production system according to an embodiment of the present application is shown; Figure 7 A schematic diagram of a curve showing the variation of voltage and current of an electrolytic cell with power according to an embodiment of the present application is shown; Figure 8 A second structural schematic diagram of a wind power hydrogen production system according to an embodiment of the present application is shown.

[0013] Main component symbol explanation: 10: wind power generation module; 20: rectifier module; 30: power conversion module; 31: power conversion unit; 40: electrolytic cell module; 41: electrolytic cell; 50: control module; 60: energy storage module. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0015] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of the present application.

[0016] Hereinafter, the terms "include", "have", and their conjugates, used in the various embodiments of the present application, merely indicate that specific features, numbers, steps, operations, elements, components, or combinations thereof are present and do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof.

[0017] Unless defined otherwise, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present application belong. Such terms, as commonly used in the art, shall be interpreted to have the same meaning as those in the context of the relevant art and shall not be interpreted to have idealized or overly formal meanings, unless clearly defined in the various embodiments of the present application.

[0018] Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments can be combined with each other in the case of no conflict.

[0019] Hydrogen is considered to be one of the most potential sustainable energy carriers to address global warming and fossil energy depletion. At present, most of the hydrogen production relies on fossil energy, which not only consumes limited fossil resources, but also is not conducive to addressing environmental problems such as global warming. In contrast, water electrolysis is a cleaner and more sustainable way. If renewable energy such as wind power and photovoltaic power is used as the power source for water electrolysis, truly green hydrogen can be produced. For example, in the present scheme, the power source for water electrolysis is offshore wind power.

[0020] Considering that the random change of wind speed in the prior art can cause the output power of the wind turbine to fluctuate greatly in a short time, and such power fluctuation will be directly transmitted to the electrolysis cell system coupled therewith. When the wind power suddenly decreases, it may cause the electrolysis cell system to deviate from the optimal working point, and even trigger the protection mechanism to shut down. In the case of power surge, it may cause waste of electric energy or additional stress on system equipment, etc. The present application provides a wind power hydrogen production system and its control method, terminal equipment and storage medium. The system indirectly obtains the rotational speed and available power of the wind power module by detecting the ripple frequency in the direct current signal, and dynamically adjusts the control signal of the power conversion unit for providing electric energy to the electrolysis cell, so as to match the power consumption of the electrolysis cell with the wind power output, and improve the stability and adaptability of the system operation. The wind power hydrogen production system will be described below in combination with some specific embodiments.

[0021] Figure 1 A structural schematic diagram of the wind power hydrogen production system of the embodiments of the present application is shown. Exemplarily, the system comprises a wind power generation module 10, a rectification module 20, a power conversion module 30, an electrolytic cell module 40 and a control module 50.

[0022] The wind power generation module 10 is configured to convert wind energy into an alternating current signal. Exemplarily, the wind power generation module 10 comprises a wind turbine and a permanent magnet synchronous generator. The permanent magnet synchronous generator is directly driven by the wind turbine to generate an alternating current signal. Specifically, the mechanical power of the wind turbine can be obtained according to the wind speed or the rotating speed of the wind turbine. By setting the wind power generation module 10, the wind energy is efficiently converted into an alternating current signal, thereby improving the wind energy utilization efficiency and the stability of the electric energy output. The rectification module 20 is connected to the output end of the wind power generation module 10 and is configured to rectify the alternating current signal to obtain a direct current signal. Exemplarily, the rectification module 20 is a three-phase diode rectifier bridge.

[0023] The power conversion module 30 comprises at least one power conversion unit 31. The number of the power conversion units 31 can be set according to the number of the electrolytic cells 41. Further, an energy storage module 60 can also be provided in the system. The power conversion module 30 comprises the power conversion units 31 connected to the respective electrolytic cells 41 and the power conversion units 31 connected to the energy storage module 60.

[0024] The input end of each power conversion unit 31 is connected to the output end of the rectification module 20. Each power conversion unit 31 is configured to adjust the direct current signal according to a corresponding control signal to obtain an adjusted electric signal. Specifically, the control signal is generated by the control module 50, and each power conversion unit 31 adjusts the direct current signal according to the control signal at the control end thereof. The power conversion unit 31 can be set according to the actual application. Exemplarily, Figure 2 A circuit schematic diagram of the power conversion unit 31 of the embodiments of the present application is shown. The power conversion unit 31 is a stacked interleaved step-down converter comprising two filter branches and two bridge arm units connected in parallel. The two ends of the two bridge arm units are configured to be connected to the output end of the rectification module 20. The middle nodes of the two bridge arm units are configured to be connected to one filter branch. The output end of each filter branch is configured to be connected to a corresponding electrolytic cell 41.

[0025] Specifically, each bridge arm unit has the same structure and comprises two series-connected switch tubes, for example, Figure 2As shown, the series-connected switch tube T1 and switch tube T3 form a bridge arm unit, and the series-connected switch tube T2 and switch tube T4 form a bridge arm unit, and each switch tube is inversely connected in parallel with a diode, which can conduct freewheeling while protecting each switch tube. The filter branch can be set according to actual application, and exemplarily, the filter branch is a passive network formed by series connection of a resistor, an inductor and a capacitor, for example, a resistor Rs, an inductor Ls and a capacitor Cs form a passive network; a resistor Rp, an inductor Lp and a capacitor Cp form a passive network, which is used to smooth the output voltage and current, reduce the ripple, and ensure the power quality of the electrolytic cell 41.

[0026] S1 and S2 are control signals generated by the control module 50, which are used to determine the working state of the switching element. According to the pulse width modulation signals of S1 and S2, the on and off time of the switching element can be adjusted, and then the flow direction and conversion efficiency of the energy can be controlled. The waveform diagram in the figure shows the typical PWM signals of S1 and S2. The power conversion unit 31 adopts a stacked interleaved step-down converter structure, which includes two parallel bridge arm units and corresponding filter branches. It not only improves the system output capacity and stability, but also realizes the mutual cancellation of current ripples at any duty cycle through the interleaved working mode, thereby significantly reducing the output current harmonic content, improving the power quality, avoiding the increase of energy consumption and the reduction of reliability due to harmonic superposition. In the bridge arm unit, the structure of series-connected switch tubes and inversely parallel-connected diodes is adopted, which not only realizes efficient freewheeling, but also effectively protects the switching element; the filter branch adopts an RLC passive network formed by series connection of a resistor, an inductor and a capacitor, which further smooths the output voltage and current, reduces the filtering demand, and avoids the use of bulky passive or active filters.

[0027] The control module 50 adjusts the duty cycle of the PWM signals of S1 and S2 to realize accurate control of the energy flow direction and conversion efficiency, and introduces a dead time TD to prevent the upper and lower bridge arms from being short-circuited, thereby enhancing the reliability and fault robustness of the system. This structure has good conversion efficiency and excellent dynamic response performance, and its response speed can be faster than the dynamic change of the generator, thereby avoiding the additional voltage stress on the front-end components and significantly improving the overall system efficiency and return on investment.

[0028] The electrolytic cell module 40 includes at least one electrolytic cell 41, and each electrolytic cell 41 is connected to a corresponding power conversion unit 31 for electrolyzing water to produce hydrogen using the adjusted electrical signal of the corresponding power conversion unit 31. The number of electrolytic cells 41 in the electrolytic cell module 40 can be set according to actual application, and exemplarily, as shown in the figure, there are three electrolytic cells 41 in the electrolytic cell module 40. Figure 1

[0029] ​It can be understood that the electrolytic tank 41 can use any water electrolysis hydrogen production technology, for example, alkaline water electrolysis hydrogen production technology, proton exchange membrane water electrolysis hydrogen production technology, or high-temperature water electrolysis hydrogen production technology based on solid oxide cell, etc. Demonstratively, the electrolytic tank 41 of the embodiment of the present application adopts the proton exchange membrane water electrolysis hydrogen production technology, which has higher current density, better power-to-weight ratio, faster dynamic response capability, wider current operating range and higher operation flexibility.

[0030] The control module 50 is configured to obtain the available power of the wind power generation module 10 according to the ripple frequency of the direct current signal, determine the input voltage corresponding to each electrolytic tank 41 according to the available power, and generate a corresponding control signal based on the input voltage and send it to the power conversion unit 31 connected to the electrolytic tank 41.

[0031] Specifically, the control module 50 obtains the speed of the wind turbine according to the ripple frequency of the direct current signal, obtains the available power of the wind turbine according to the speed, determines the number of electrolytic tanks 41 that need to be put into operation according to the available power and the rated power of the electrolytic tank 41, thereby determining the input voltage corresponding to each electrolytic tank 41, and generating a corresponding control signal to be sent to the power conversion unit 31 connected to each electrolytic tank 41, so that each power conversion unit 31 generates a corresponding input voltage to power the electrolytic tank 41.

[0032] Demonstratively, Figure 3 A flowchart of a control method of a wind power hydrogen production system according to an embodiment of the present application is shown; the control method comprises S101-S103: S101, obtaining the ripple frequency in the direct current signal, and determining the speed of the wind power generation module 10 according to the ripple frequency.

[0033] Specifically, the main shaft of the wind turbine is directly connected to the rotor of the permanent magnet synchronous generator. Therefore, the speed of the wind turbine in the wind power generation module 10 is the same as the speed of the permanent magnet synchronous generator, and the relationship between the ripple frequency of the direct current signal and the electrical angular frequency of the generator is: fi=6fe;(1) Wherein, fi represents the ripple frequency of the direct current signal; fe represents the electrical angular frequency of the generator.

[0034] And the relationship between the electrical angular frequency and the speed of the generator is: fe=p / 2× / (2π);(2) Wherein, fe represents the electrical angular frequency of the generator; p represents the number of pole pairs of the generator; represents the speed of the generator.

[0035] According to formula (1) and formula (2), it can be obtained that: =2π / (3p)×fi;(3) The rotational speed of the wind turbine in wind power generation module 10 Same speed as permanent magnet synchronous generator Therefore, the rotational speed of the wind turbine can be obtained from the ripple frequency of the DC signal. .

[0036] For example, in one implementation, such as Figure 4 As shown, S101 includes the following sub-steps: S201, obtains the voltage ripple signal from the DC signal.

[0037] A high-pass filter can be used to eliminate the DC component in a DC signal and obtain the voltage ripple signal.

[0038] S202 shapes the voltage ripple signal to generate a pulse signal with a fixed pulse width. The voltage ripple signal is converted into a square wave signal using a comparator. A high-level signal is generated on the rising edge of the square wave signal by a monostable circuit. That is, the monostable circuit generates a pulse signal with a fixed pulse width of Tm, a period of T=1 / fi, and a duty cycle of D=Tm / T=Tmfi.

[0039] S203, based on the difference between the pulse signal and its logical transformation signal, determine the rotational speed of the wind power generation module 10.

[0040] The logic transformation signal is an inverted signal with the same period as the pulse signal and a duty cycle of 1-Tmfi. A low-pass filter is used to filter the pulse signal and the inverted signal, and the output signal is the difference between the two: Vout=K(2D-1)=K(2Tmfi-1), where K is the gain coefficient, which is the product of the pulse signal amplitude and the gain of the low-pass filter. Thus, the relationship between the ripple frequency of the DC signal and the output signal of the low-pass filter can be obtained. Furthermore, the center frequency can be set to fc=1 / 2Tm, where Tm is the pulse width, thus obtaining Vout=(2KTm)×(fi-fc). According to this formula, the ripple frequency fi=Vout / 2KTm+fc of the DC signal is obtained. Substituting this into formula (3), the rotational speed... =2π / (3p)×(Vout / 2KTm+fc).

[0041] The technical effect of accurately obtaining the rotating speed of the wind turbine without an additional rotating speed sensor is realized by extracting the voltage ripple signal from the direct current signal and inversely deducing the rotating speed of the wind power generation module 10 based on the ripple frequency. Specifically, the rotating speed calculation formula is deduced by utilizing the characteristics of the direct connection of the wind turbine and the permanent magnet synchronous generator, combining the mathematical relationship between the direct current ripple frequency and the electrical angle frequency of the generator, and the relationship between the electrical angle frequency and the rotating speed, so as to construct the rotating speed detection mechanism based on the voltage ripple frequency. The fixed pulse width pulse signal is generated by high-pass filtering and shaping the voltage ripple signal, and the output voltage Vout in linear relationship with the ripple frequency is obtained by low-pass filtering the inverse signal, the expression between the ripple frequency fi and Vout is further deduced, and finally the accurate calculation of the rotating speed of the wind power generation module 10 is realized. Without mechanical sensors, the reliability and integration of the system are improved, and the rotating speed detection and control scene of the direct drive type wind power generation system is suitable.

[0042] S102, in combination with the characteristic mapping model of the wind power generation module 10, the available power of the wind power generation module 10 is determined according to the rotating speed.

[0043] As Figure 5 shown, for the same wind speed, the power changes with the change of the rotating speed, and reaches the maximum power at a certain rotating speed, the rotating speed corresponding to the maximum power is set as the optimal rotating speed of the current wind speed, and the optimal rotating speeds corresponding to various wind speeds are connected in turn to form a red curve. The available power is the maximum power corresponding to the current wind speed, so that the wind turbine works at the optimal rotating speed. Specifically, the formula of the characteristic mapping model of the wind power generation module 10 is: ; (4) wherein, represents the maximum mechanical power of the wind turbine; represents the air density; represents the radius of the turbine blade; represents the rotating speed of the wind turbine, represents the optimal tip speed ratio; represents the maximum power coefficient.

[0044] The curve corresponding to formula (4) is the red curve in Figure 5 . The rotating speed of the wind turbine in the wind power generation module 10 is the same as the rotating speed of the permanent magnet synchronous generator Similarly, the maximum power of the wind turbine is obtained by substituting the rotational speed according to the ripple frequency of the direct current signal into formula (4), and the electrolytic cell 41 corresponding power conversion module 30 is controlled according to the maximum power, so that the rotational speed of the wind turbine approaches the optimal rotational speed. For example, when the wind speed is 8 m / s, the intersection of the rotational speed 800 n / rpm and the power is N1, the intersection of the rotational speed 1000 n / rpm and the power is N2, and the intersection of the rotational speed 1200 n / rpm and the power is N3, wherein the rotational speed 1000 n / rpm is the optimal rotational speed, and the corresponding power is the maximum power.

[0045] If the rotational speed calculated according to the ripple frequency is 800 n / rpm, substitute =800 n / rpm into formula (4) to obtain the power corresponding to intersection N4, and control the electrolytic cell 41 corresponding power conversion module 30 using the power corresponding to intersection N4. At this time, the actual power generated by the wind turbine is the power corresponding to intersection N1, which is greater than the power consumed by the electrolytic cell module 40, and the wind turbine accelerates, and the rotational speed approaches the optimal rotational speed 1000 n / rpm from 800 n / rpm; if the rotational speed calculated according to the ripple frequency is 1200 n / rpm, substitute =1200 n / rpm into formula (4) to obtain the power corresponding to intersection N5, and control the electrolytic cell 41 corresponding power conversion module 30 using the power corresponding to intersection N5. At this time, the actual power generated by the wind turbine is the power corresponding to intersection N3, which is less than the power consumed by the electrolytic cell module 40, and the wind turbine decelerates, and the rotational speed approaches the optimal rotational speed 1000 n / rpm from 1200 n / rpm.

[0046] The rotational speed of the permanent magnet synchronous generator is consistent with the rotational speed of the wind turbine, the real-time rotational speed is obtained by detecting the ripple frequency of the direct current signal, the theoretical maximum power to be output at the current rotational speed is determined by substituting the maximum power calculation formula, and the target power of the power conversion module 30 is set accordingly. When the actual wind power generation power is greater than the electrolytic cell 41 consumption power, the wind turbine accelerates, and vice versa. Ultimately, the rotational speed approaches the optimal rotational speed, thereby realizing the maximum utilization of wind energy and improving the energy conversion efficiency and operation stability of the overall system.

[0047] S103, determine the input voltage corresponding to each electrolytic cell 41 according to the available power, generate a corresponding control signal based on the input voltage, and send it to the power conversion unit 31 connected to the electrolytic cell 41.

[0048] Specifically, the available power is the maximum power, the input voltage of each electrolytic cell 41 is determined according to the maximum power, and the control signal is generated according to the input voltage to control the power conversion unit 31.

[0049] For example, in one embodiment, as shown inFigure 6 As shown, S103 comprises the following sub-steps: S301, determining the number of electrolytic cells 41 to be put into operation based on the relationship between the maximum power and the rated power of the electrolytic cell 41.

[0050] Exemplarily, the number of electrolytic cells 41 in the electrolytic cell module 40 is three, and the rated power of each electrolytic cell 41 is 400W. The maximum power is divided by the rated power of the electrolytic cell 41 to determine the number of electrolytic cells 41 to be put into operation. For example, if the maximum power is 800W, it is determined that two electrolytic cells 41 are put into operation, and if the maximum power is greater than 800W, it is determined that three electrolytic cells 41 are put into operation.

[0051] S302, when the relationship between the maximum power and the rated power of a single electrolytic cell 41 satisfies an integer multiple relationship, outputting a control signal corresponding to the rated voltage to each electrolytic cell 41 to be put into operation.

[0052] If the maximum power is 800W, the control signal is sent to the power conversion unit 31 connected to the two electrolytic cells 41 to be put into operation, so that the two power conversion units 31 output the rated voltage of the electrolytic cell 41 to supply power to the two electrolytic cells 41.

[0053] S303, when there is a non-integer multiple part between the maximum power and the rated power, according to the residual power part and the electrolytic cell voltage power mapping model, the voltage signal of the electrolytic cell 41 matched with the residual power is obtained, and the control signal corresponding to the voltage signal is generated to control the corresponding power conversion unit 31 to output the adaptive voltage.

[0054] If the maximum power is 1000W, the control signal is sent to the power conversion unit 31 connected to the two electrolytic cells 41 to be put into operation, so that the two power conversion units 31 output the rated voltage of the electrolytic cell 41 to supply power to the two electrolytic cells 41. Another electrolytic cell 41 needs to generate a control signal according to the power of 200W by the control module 50.

[0055] Specifically, the electrolytic cell voltage power mapping model can be set, which is fitted by a second-order polynomial based on different powers of the electrolytic cell 41 and the corresponding voltage values. Exemplarily, the formula of the electrolytic cell voltage power mapping model is: ; (5) Wherein, represents the voltage signal of the electrolytic cell 41, represents the residual power.

[0056] The remaining power is substituted into formula (5) to obtain the input voltage of the other electrolytic cell 41. The control module 50 generates a corresponding control signal to the power conversion unit 31 connected to the other electrolytic cell 41 according to the input voltage, so that the power conversion unit 31 generates an input voltage for the electrolytic cell 41.

[0057] By dynamically determining the number of electrolytic cells 41 put into operation according to the maximum power output by the wind turbine, and generating an adaptive input voltage and control signal in combination with the electrolytic cell voltage-power mapping model, accurate control of the power conversion unit 31 is realized, ensuring that each electrolytic cell 41 operates efficiently at rated or matched power, thereby maximizing green hydrogen production efficiency, while improving overall energy utilization and operation stability of the system.

[0058] It can be understood that the real-time change of the rotational speed of the wind turbine will cause the real-time change of the maximum power, so that the control module 50 adjusts in real time according to the maximum power, for example, as shown in Figure 7 The green curve represents the voltage curve of the electrolytic cell 41, the yellow curve represents the current curve of the electrolytic cell 41, and the blue curve represents the power change curve. If the power corresponding to the electrolytic cell 41 matched with the remaining power decreases from 130W to 25W, the controller controls the power conversion unit 31 of the electrolytic cell 41 to make the voltage and current of the electrolytic cell 41 respond quickly within 5ms, complete the jump, and it can be seen that the voltage and current are stable, there is no obvious ripple, the transient change is very rapid, and the dynamic performance is good. Therefore, the system structure and control strategy of the present application have good effect and strong reliability.

[0059] Further, on the basis of the above embodiment, Figure 8 Another structural schematic diagram of the wind power hydrogen production system according to the embodiment of the present application is shown. The wind power hydrogen production system further comprises an energy storage module 60, which is connected to the output end of the rectifier module 20 through the power conversion unit 31, and is used for charging energy storage when the available power is greater than the total demand power of the electrolytic cell module 40, and outputting electric energy through the power conversion unit 31 when the available power is less than the total demand power.

[0060] Exemplarily, the power conversion module 30 comprises four power conversion units 31, three of which are connected to corresponding electrolytic cells 41, and the other one is connected to the energy storage module 60. It can be understood that the power conversion unit 31 is a bidirectional conversion unit, and the energy storage module 60 can be charged through the power conversion unit 31 and discharged through the power conversion unit 31.

[0061] If the available power is greater than the total required power of the electrolyzer module 40, the control module 50 outputs a corresponding control signal to the power conversion unit 31 connected to the energy storage module 60 to charge the energy storage module 60. For example, the maximum power is 1500W, and the rated power of three electrolyzers 41 in the electrolyzer module 40 is 400W, then the excess 300W power can be delivered to the energy storage module 60 for power supply through the power conversion unit 31; when it is needed to use the electrical energy in the energy storage module 60 to power the electrolyzer 41, the energy storage module 60 can be discharged through the power conversion unit 31.

[0062] By introducing the energy storage module 60 and its corresponding bidirectional power conversion unit 31, dynamic adjustment and efficient utilization of energy in the wind power hydrogen production system are realized: when the available power output by the wind turbine exceeds the total required power of the electrolyzer module 40, the control module 50 drives the energy storage module 60 to charge, stores the excess energy for subsequent use; and when the available power is insufficient, the energy storage module 60 releases electrical energy through the bidirectional power conversion unit 31 to supplement the power requirement of the electrolyzer 41, thereby maintaining stable operation of the system. This structure not only improves the adaptability and utilization rate of the system to renewable energy, but also enhances the robustness and continuous energy supply capability of the system under wind speed fluctuation, further improving the efficiency and economy of green hydrogen production.

[0063] In an embodiment, a control method of a wind power hydrogen production system is provided. The control method of the wind power hydrogen production system provided in the embodiment is applied to the control module 50 of the wind power hydrogen production system in any of the above embodiments, and specifically includes: Obtaining a ripple frequency in the direct current signal, and determining a rotational speed of the wind power generation module 10 according to the ripple frequency; Combining a characteristic mapping model of the wind power generation module 10, and determining an available power of the wind power generation module 10 according to the rotational speed; Determining an input voltage corresponding to each electrolyzer 41 according to the available power, generating a corresponding control signal based on the input voltage, and sending the control signal to the power conversion unit 31 connected to the electrolyzer 41. Further, obtaining a ripple frequency in the direct current signal, and determining a rotational speed of the wind power generation module 10 according to the ripple frequency includes: Obtaining a voltage ripple signal from the direct current signal; Shaping the voltage ripple signal to generate a pulse signal with a fixed pulse width; Determining the rotational speed of the wind power generation module 10 based on the difference between the pulse signal and its logical transformed signal. Further, the available power is the maximum power corresponding to the current wind speed, and generating a corresponding input voltage according to the available power includes: determine the number of electrolytic cells 41 to be put into operation based on the relationship between the maximum power and the rated power of the electrolytic cell 41; When the maximum power and the rated power of a single electrolytic cell 41 satisfy an integer multiple relationship, a control signal corresponding to the rated voltage is output to each electrolytic cell 41 put into operation; When there is a non-integer multiple part between the maximum power and the rated power, according to the electrolytic cell voltage-power mapping model, the voltage signal of the electrolytic cell 41 matched with the remaining power part is obtained, and a control signal corresponding to the voltage signal is generated to control the corresponding power conversion unit 31 to output an adaptive voltage. Further, if the available power is greater than the total demand power of the electrolytic cell module 40, a corresponding control signal is output to the power conversion unit 31 connected to the energy storage module 60 to charge the energy storage module 60.

[0064] Further, the electrolytic cell voltage-power mapping model is fitted by a second-order polynomial based on different powers of the electrolytic cell 41 and the corresponding voltage values.

[0065] It can be understood that the method of the embodiment corresponds to the system of the above-mentioned embodiment, and the optional items in the above-mentioned embodiment are also applicable to the embodiment. The control method of the wind power hydrogen production system provided by the embodiment can realize the functions of the wind power hydrogen production system corresponding to the above-mentioned embodiment, and can achieve the same technical effects. To avoid repetition, it will not be described here.

[0066] The application also provides a terminal device. Illustratively, the terminal device includes a processor and a memory, wherein the memory stores a computer program, and the processor runs the computer program, so that the device executes the control method of the wind power hydrogen production system or the functions of each module in the wind power hydrogen production system.

[0067] The processor can be an integrated circuit chip with a signal processing capability. The processor can be a general-purpose processor, including a central processing unit (CPU), a graphics processing unit (GPU), and a network processor (NP), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or at least one of the above. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc., which can implement or execute the disclosed methods, steps, and logic block diagrams in the embodiments of the application.

[0068] The memory can be, but is not limited to, a random access memory (RAM), a read only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), and the like. Among them, the memory is used to store a computer program, and the processor can execute the computer program correspondingly after receiving an execution instruction.

[0069] The application further provides a computer readable storage medium for storing the computer program used in the terminal device. For example, the computer readable storage medium can include, but is not limited to, a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0070] In several embodiments provided in the present application, it should be understood that the disclosed apparatus and method can also be implemented by other manners. The apparatus embodiments described above are only schematic, for example, the flow charts and structural diagrams in the drawings show the possible implementation architectures, functions and operations of the apparatus, method and computer program product according to the embodiments of the present application. In this regard, each block in the flow chart or block diagram can represent a module, a program segment or a part of code, which contains one or more executable instructions for implementing the specified logical function. It should also be noted that, in alternative implementation manners, the functions noted in the blocks can also occur in different orders from those noted in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved. It should also be noted that each block in the structural diagram and / or flow chart, and the combination of blocks in the structural diagram and / or flow chart, can be implemented by a dedicated hardware-based system for executing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0071] In addition, each functional module or unit in the embodiments of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0072] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which can be a smart phone, a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.

[0073] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be encompassed in the protection scope of the present application.

Claims

1. A wind power hydrogen production system, characterized in that, The system includes: Wind power generation module, used to convert wind energy into alternating current signals; A rectifier module, connected to the output terminal of the wind power generation module, is used to rectify the AC signal to obtain a DC signal; A power conversion module includes at least one power conversion unit, the input terminal of each power conversion unit is connected to the output terminal of the rectifier module, and is used to adjust the DC signal according to the corresponding control signal to obtain the adjusted electrical signal; An electrolyzer module includes at least one electrolyzer, each of the electrolyzers being connected to a corresponding power conversion unit for producing hydrogen by electrolyzing water using the regulated electrical signal of the corresponding power conversion unit; The control module is used to obtain the available power of the wind power generation module according to the ripple frequency of the DC signal, determine the input voltage corresponding to each electrolytic cell according to the available power, generate the corresponding control signal based on the input voltage, and send it to the power conversion unit connected to the electrolytic cell respectively.

2. The wind power hydrogen production system according to claim 1, characterized in that, Also includes: An energy storage module is configured to be connected to the output terminal of the rectifier module via the power conversion unit, for storing and charging energy when the available power is greater than the total required power of the electrolytic cell module, and for outputting electrical energy through the power conversion unit when the available power is less than the total required power.

3. The wind power hydrogen production system according to claim 1, characterized in that, The power conversion unit is a stacked interleaved buck converter, including two filter branches and two parallel bridge arm units. The two ends of the two bridge arm units are used to connect to the output of the rectifier module, and the middle node of the two bridge arm units is connected to one of the filter branches. The output of each filter branch is used to connect to the corresponding electrolytic cell. Each of the bridge arm units has the same structure, including two series-connected switching transistors, and each of the switching transistors is connected in parallel with a diode in opposite phase.

4. A control method for a wind power hydrogen production system, characterized in that, A control module applied to the wind power hydrogen production system as described in any one of claims 1-3, comprising: Obtain the ripple frequency in the DC signal, and determine the rotational speed of the wind power generation module based on the ripple frequency; Based on the characteristic mapping model of the wind power generation module, the available power of the wind power generation module is determined according to the rotational speed; The input voltage corresponding to each electrolytic cell is determined based on the available power, and the corresponding control signal is generated based on the input voltage and sent to the power conversion unit connected to the corresponding electrolytic cell.

5. The control method for the wind power hydrogen production system according to claim 4, characterized in that, The step of acquiring the ripple frequency in the DC signal and determining the rotational speed of the wind power generation module based on the ripple frequency includes: Obtain the voltage ripple signal from the DC signal; The voltage ripple signal is shaped to generate a pulse signal with a fixed pulse width; The rotational speed of the wind power generation module is determined based on the difference between the pulse signal and its logical transformation signal.

6. The control method for the wind power hydrogen production system according to claim 4, characterized in that, The available power is the maximum power corresponding to the current wind speed, and the step of generating the corresponding input voltage based on the available power includes: Based on the relationship between the maximum power and the rated power of the electrolytic cell, the number of electrolytic cells that need to be put into operation is determined; When the maximum power is an integer multiple of the rated power of a single electrolytic cell, a control signal corresponding to the rated voltage is output to each electrolytic cell in operation. When there is a non-integer multiple between the maximum power and the rated power, the voltage signal of the electrolytic cell that matches the remaining power is obtained according to the remaining power portion and the electrolytic cell voltage-power mapping model, and a control signal corresponding to the voltage signal is generated to control the corresponding power conversion unit to output the appropriate voltage.

7. The control method for the wind power hydrogen production system according to claim 4, characterized in that, If the available power is greater than the total power required by the electrolytic cell module, a corresponding control signal is output to the power conversion unit connected to the energy storage module to charge the energy storage module.

8. The control method for the wind power hydrogen production system according to claim 6, characterized in that, The electrolytic cell voltage-power mapping model is obtained by fitting a second-order polynomial based on the different powers of the electrolytic cell and their corresponding voltage values.

9. A terminal device, characterized in that, The terminal device includes a processor and a memory, the memory storing a computer program, and the processor executing the computer program to implement the steps of the control method for the wind power hydrogen production system according to any one of claims 4-8.

10. A computer-readable storage medium, characterized in that, It stores a computer program, which, when executed on a processor, implements the steps of the control method for the wind power hydrogen production system according to any one of claims 4-8.

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