System frequency control method, device and equipment for electrolytic hydrogen production

Abstract

The invention discloses a system frequency control method, device and equipment for electrolytic hydrogen production. The method comprises the following steps: acquiring a real-time system frequency of a new energy power system; calculating the fluctuation amplitude of the current system disturbance according to the real-time system frequency and a preset reference system frequency; by taking the fluctuation amplitude of the current system disturbance as a parameter, calculating a power variation corresponding to an electrolytic cell group in electrolytic hydrogen production according to a preset power frequency formula; calculating the offset of the phase shift angle of the half-controlled power controller according to the power variation, and correcting the phase shift angle of the half-controlled power controller according to the offset; according to the invention, the power frequency characteristic of the source load power balance of the non-electronic power load can be simulated according to the power and frequency response characteristic of the electrolytic cell group; therefore, the frequency flexible adjustment of the new energy power system by the electric heating load can be realized.

Description

Technical Field

[0001] The present invention relates to the field of power systems, and in particular to a system frequency control method, device and equipment for electrolytic hydrogen production. Background Art

[0002] Frequency stability refers to the ability of a system to maintain its frequency within a certain range after being subjected to a disturbance that causes an imbalance in power between the source and the load.

[0003] In traditional power systems, synchronous generators generally have automatic droop characteristics, and the load power of motor-driven machinery such as compressors, fans, and pumps is positively correlated with the speed / frequency. Therefore, system frequency regulation for short-term or small disturbances can be achieved through automatic feedback, while longer-term power differences are achieved through AGC secondary frequency regulation or scheduling.

[0004] In AC power systems dominated by renewable energy, with the massive integration of renewable energy generation and non-rotating motor loads, as well as the construction of high-voltage DC interconnected systems, the constant power control mode of power electronic converters has led to a serious reduction in the correlation between the power of power supplies, loads, and other equipment and the system frequency, manifesting as an increasingly weak frequency regulation capability. As a result, the frequency stability problem of AC island systems for renewable energy hydrogen electrolysis has become increasingly serious. In existing technologies, when a renewable energy power system is disturbed, the frequency stability of the system is generally controlled by controlling the charge and discharge of energy storage units within the system.

[0005] After research, the inventors found that the existing technical solutions for frequency stability control of new energy power systems still have at least the following defects:

[0006] The energy storage unit charge and discharge control method to deal with the system frequency disturbance has poor timeliness and effectiveness, and cannot achieve good control effect.

[0007] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0008] The purpose of the present invention is to be able to timely and effectively control the system frequency and improve the control effect.

[0009] The present invention provides a system frequency control method for electrolytic hydrogen production, wherein the electrolytic hydrogen production is applied to a new energy power system, comprising:

[0010] S11. Obtaining the real-time system frequency of the new energy power system;

[0011] S12. Calculating the fluctuation amplitude of the current system disturbance according to the real-time system frequency and a preset reference system frequency;

[0012] S13. Using the fluctuation amplitude of the current system disturbance as a parameter, calculate the corresponding power variation of the electrolytic cell group in the electrolytic hydrogen production according to a preset power frequency formula; the power frequency formula includes:

[0013]

[0014] Where, is the active power change of the electric heating load; D is the load damping coefficient of the power and frequency response characteristics; Δf * is the per-unit value of the system frequency variation;

[0015] S14. Calculate the offset of the phase shift angle of the semi-controlled power controller based on the power change, and correct the phase shift angle of the semi-controlled power controller based on the offset; the semi-controlled power controller is used to control the power of the electrolytic cell group by adjusting the phase shift angle.

[0016] Preferably, the present invention further comprises:

[0017] S15. When the fluctuation amplitude of the current system disturbance is greater than a preset range, the system frequency is adjusted by controlling the charge and discharge of the energy storage device, and / or the fluctuation amplitude of the system frequency is reduced by switching the power supply and / or the electrolytic cell group.

[0018] In another aspect of the present invention, a system frequency control device for hydrogen production by electrolysis is provided, wherein the hydrogen production by electrolysis is applied to a new energy power system, comprising:

[0019] Frequency monitoring unit, used to obtain the real-time system frequency of the new energy power system;

[0020] an amplitude calculation unit, configured to calculate the fluctuation amplitude of the current system disturbance based on the real-time system frequency and a preset reference system frequency;

[0021] The power change calculation unit is used to calculate the corresponding power change of the electrolytic cell group in the electrolytic hydrogen production according to a preset power frequency formula using the fluctuation amplitude of the current system disturbance as a parameter; the power frequency formula includes:

[0022]

[0023] Where, is the active power change of the electric heating load; D is the load damping coefficient of the power and frequency response characteristics; Δf * is the per-unit value of the system frequency variation

[0024] A phase shift angle correction unit is used to calculate the offset of the phase shift angle of the semi-controlled power controller based on the power change, and to correct the phase shift angle of the semi-controlled power controller based on the offset; the semi-controlled power controller is used to control the power of the electrolytic cell group by adjusting the phase shift angle.

[0025] Preferably, in the embodiment of the present invention, it further includes:

[0026] The source-load switching unit is used to adjust the system frequency by controlling the charge and discharge of the energy storage device when the fluctuation amplitude of the current system disturbance is greater than a preset range, and / or to reduce the fluctuation amplitude of the system frequency by switching the power supply and / or the electrolytic cell group.

[0027] On the other hand, an embodiment of the present invention further provides a system frequency control device for hydrogen production by electrolysis. The system frequency control device for hydrogen production by electrolysis includes a computer program stored on a medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the methods described in the above aspects and achieves the same technical effects.

[0028] On the other hand, a storage medium is provided on which a computer program is stored. When the computer program is executed by a processor, each step of the system frequency control method for electrolytic hydrogen production as described in any one of the above items is implemented.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The system frequency control method for electrolytic hydrogen production in the present invention is based on the conventional power control method of the semi-controlled power controller in the prior art, and adds an auxiliary control amount (the offset of the phase shift angle of the semi-controlled power controller) to control the stability of the system frequency under disturbances. Specifically, the present invention reuses the power regulation function of the semi-controlled power controller, and simulates the corresponding frequency response characteristics according to the functional relationship between the power change of the electrolytic cell group and the system frequency change (i.e., formula (1)). In this way, the conventional control amount of the phase shift angle of the semi-controlled power controller can be corrected by the offset, and the power-frequency characteristics of the source-load power balance of the non-electronic power load can be simulated according to the power and frequency response characteristics of the electrolytic cell group, so that automatic feedback power regulation can be realized to achieve frequency stability.

[0031] As can be seen from the above, the present invention can automatically and stably adjust small-amplitude disturbances in real time; therefore, the present invention can achieve flexible adjustment of the system frequency through moderate power adjustment; compared with the method of simply controlling the stable frequency by charging and discharging the energy storage device in the prior art, the present invention can avoid the secondary disturbance of the system frequency caused by the charging and discharging action of the energy storage device during small-amplitude disturbances, and thus can obtain better adjustment effect during small-amplitude system disturbances.

[0032] On the other hand, the traditional method of regulating system frequency through charging and discharging control of energy storage devices still has the defect of too long response time; the present invention can achieve millisecond-level response to system disturbances, and thus can also effectively reduce the negative impact of disturbances on the new energy power system.

[0033] On the other hand, in the present invention, the system frequency is no longer adjusted by the charging and discharging actions of the energy storage device when there is a small system disturbance. This can greatly reduce the charging and discharging frequency of the energy storage device, thereby effectively increasing the service life of the energy storage device.

[0034] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the specification, and to make the above and other purposes, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 Schematic diagram of the steps of the system frequency control method for electrolytic hydrogen production according to the present invention;

[0037] Figure 2 It is a structural schematic diagram of the system frequency control device for electrolytic hydrogen production according to the present invention;

[0038] Figure 3 It is a structural schematic diagram of the system frequency control device for electrolytic hydrogen production described in the present invention. DETAILED DESCRIPTION

[0039] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0040] Unless expressly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising” will be understood to include the stated elements or components but not to exclude other elements or components.

[0041] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit specific positions or relative relationships. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable with each other.

[0042] Example 1

[0043] In order to be able to control the system frequency in a timely and effective manner and improve the frequency stability of the new energy power system, refer to Figure 1 In an embodiment of the present invention, a system frequency control method for electrolytic hydrogen production is provided, including:

[0044] S11. Obtaining the real-time system frequency of the new energy power system;

[0045] The new energy power system in the embodiment of the present invention may include a new energy power supply, an AC power grid, an electric heating load, a temperature monitoring unit, a frequency monitoring unit and a control instruction unit; wherein, the electrolytic cell group for hydrogen production by electrolysis is provided with a semi-controlled power controller to control the power of the electrolytic cell group, such as a thyristor phase-shift rectifier.

[0046] In the embodiment of the present invention, the thyristor phase-shift rectifier performs power control on the electrolytic cell group according to a set target power in a normal working state (non-system disturbance state).

[0047] In practical applications, the new energy power source in the embodiment of the present invention may specifically include a wind power device and / or a photovoltaic power generation device.

[0048] In practical applications, a frequency monitoring unit can be provided to collect the system frequency of the new energy power system in real time.

[0049] S12. Calculating the fluctuation amplitude of the current system disturbance according to the real-time system frequency and a preset reference system frequency;

[0050] After determining the reference system frequency, the corresponding fluctuation amplitude can be calculated based on the real-time system frequency. In practical applications, the reference system frequency can be selected as the industrial frequency of 50Hz. In this way, the real-time fluctuation amplitude can be calculated based on the difference between the real-time system frequency and the reference system frequency.

[0051] S13. Using the fluctuation amplitude of the current system disturbance as a parameter, calculate the corresponding power variation of the electrolytic cell group in the electrolytic hydrogen production according to a preset power frequency formula; the power frequency formula includes:

[0052] For power systems with electronic power loads, the existing technology generally adjusts the system frequency through the charge and discharge control of energy storage devices. Since the frequency amplitude of its single-step adjustment is large, when it is applied to small-amplitude system disturbances, it is very likely to cause secondary disturbances to the system frequency, and a good regulation effect cannot be achieved, which in turn makes the frequency stability of the power system very poor.

[0053] To this end, in an embodiment of the present invention, the power regulation function of the thyristor phase-shift rectifier is utilized to simulate the source-load power balance characteristics of a non-electronic power load. Specifically, when a system disturbance occurs, the charge and discharge control of the energy storage device is no longer used to adjust the system frequency. Instead, the corresponding power change of the electrolyzer group in hydrogen electrolysis is calculated according to the power-frequency formula. In this way, the system frequency can be adjusted in real time through the power change of the electrolyzer group to stabilize the system frequency. This further simulates the effect of stabilizing the system frequency through the power and frequency response characteristics of the electrolyzer group.

[0054] When determining the value of the load damping coefficient D of the power and frequency response characteristics in the embodiment of the present invention, the value of the load damping coefficient D can be determined from the range of 1.2-1.8 based on the power changes that a general electrolytic cell group can withstand. Preferably, the value of the load damping coefficient D can be set to 1.5.

[0055] The power frequency formula includes:

[0056]

[0057] Where, is the active power change of the electric heating load; D is the load damping coefficient of the power and frequency response characteristics; Δf * is the per-unit value of the system frequency variation;

[0058] S14. Calculate the offset of the phase shift angle of the semi-controlled power controller based on the power change, and correct the phase shift angle of the semi-controlled power controller based on the offset; the semi-controlled power controller is used to control the power of the electrolytic cell group by adjusting the phase shift angle.

[0059] In the prior art, the control quantity of a semi-controlled power controller (such as a thyristor phase shifter) does not take system disturbances into consideration. In an embodiment of the present invention, the corresponding offset of the phase shift angle of the semi-controlled power controller is calculated based on the fluctuation amplitude of the current system disturbance as a correction quantity for the control quantity of the semi-controlled power controller; for example, the final control quantity of the phase shift angle of the fully-controlled power controller can be generated by adding the offset to the original conventional control quantity; in this way, the power of the electrolytic cell group can be reduced in real time when the current system frequency is lower than the reference frequency, and the power of the electrolytic cell group can be increased in real time when the current system frequency is higher than the reference frequency, thereby simulating and realizing self-feedback power regulation of non-electronic power equipment.

[0060] Preferably, in the embodiment of the present invention, the steps may also be included:

[0061] S15. When the fluctuation amplitude of the current system disturbance is greater than a preset range, the system frequency is adjusted by controlling the charge and discharge of the energy storage device, and / or the fluctuation amplitude of the system frequency is reduced by switching the power supply and / or the electrolytic cell group.

[0062] When the system frequency is significantly disturbed (i.e., the fluctuation amplitude is greater than a preset range), the system frequency can be adjusted by charging and discharging the energy storage device. Furthermore, in order to avoid damage to the equipment, the system frequency can be stabilized by switching on and off the power supply and / or electrolytic cell group to avoid electrical failures of the equipment caused by system frequency fluctuations.

[0063] In an embodiment of the present invention, the value of the preset interval should be set according to the actual working conditions of the electrolytic cell group. In practical applications, the rated frequency of the new energy power system can be set to 50Hz; the acceptable minimum power of the electrolytic cell group is set to 40% of the rated power, and the corresponding system frequency is 48Hz; the acceptable maximum power of the electrolytic cell group is set to 105% of the rated power, and the corresponding system frequency is 51Hz.

[0064] In this way, the upper limit of the preset interval can be set to 51Hz and the lower limit can be set to 48Hz; in this way, when the fluctuation of the system frequency exceeds the upper and lower limits of the preset interval, a source-load switching method with a larger adjustment range is used to control the system frequency.

[0065] It should be noted that, in the embodiment of the present invention, the upper and lower limits of the preset interval can be set by those skilled in the art according to the actual working conditions of the electrolytic hydrogen production equipment, and are not specifically limited here.

[0066] In summary, in the embodiment of the present invention, the system frequency control method for electrolytic hydrogen production is based on the conventional power control method of the semi-controlled power controller in the prior art, and an auxiliary control amount (the offset of the phase shift angle of the semi-controlled power controller) is added to control the stability of the system frequency under the disturbance of the system frequency; specifically, the present invention reuses the power regulation function of the semi-controlled power controller, and simulates the corresponding frequency response characteristics according to the functional relationship between the power change of the electrolytic cell group and the system frequency change (i.e., formula (1)); in this way, the conventional control amount of the phase shift angle of the semi-controlled power controller can be corrected by the offset, and the power-frequency characteristics of the source-load power balance of the non-electronic power load can be simulated according to the power and frequency response characteristics of the electrolytic cell group, so that automatic feedback power regulation can be realized to achieve frequency stability.

[0067] As can be seen from the above, the present invention can automatically and stably adjust small-amplitude disturbances in real time; therefore, the present invention can achieve flexible adjustment of the system frequency through moderate power adjustment; compared with the method of simply controlling the stable frequency by charging and discharging the energy storage device in the prior art, the present invention can avoid the secondary disturbance of the system frequency caused by the charging and discharging action of the energy storage device during small-amplitude disturbances, and thus can obtain better adjustment effect during small-amplitude system disturbances.

[0068] On the other hand, the traditional method of regulating system frequency through charging and discharging control of energy storage devices still has the defect of too long response time; the present invention can achieve millisecond-level response to system disturbances, and thus can also effectively reduce the negative impact of disturbances on the new energy power system.

[0069] On the other hand, in the present invention, the system frequency is no longer adjusted by the charging and discharging actions of the energy storage device when there is a small system disturbance. This can greatly reduce the charging and discharging frequency of the energy storage device, thereby effectively increasing the service life of the energy storage device.

[0070] Example 2

[0071] In another aspect of the embodiment of the present invention, a system frequency control device for electrolytic hydrogen production is also provided. Figure 2 The schematic diagram of the structure of the system frequency control device for electrolysis hydrogen production provided by the embodiment of the present invention is shown. The system frequency control device for electrolysis hydrogen production is Figure 1 The device corresponding to the system frequency control method for electrolysis hydrogen production described in the corresponding embodiment, that is, realized by means of a virtual device Figure 1In the corresponding embodiment of the system frequency control method for hydrogen production by electrolysis, each virtual module constituting the system frequency control device for hydrogen production by electrolysis can be executed by an electronic device, such as a network device, a terminal device, or a server. Specifically, the electrolysis load is provided with a thyristor phase-shift rectifier. The system frequency control device for hydrogen production by electrolysis in the embodiment of the present invention includes:

[0072] Frequency monitoring unit 01, used to obtain the real-time system frequency of the new energy power system;

[0073] Amplitude calculation unit 02, used to calculate the fluctuation amplitude of the current system disturbance according to the real-time system frequency and the preset reference system frequency;

[0074] The power change calculation unit 03 is used to calculate the corresponding power change of the electrolytic cell group in the electrolytic hydrogen production according to a preset power frequency formula using the fluctuation amplitude of the current system disturbance as a parameter; the power frequency formula includes:

[0075]

[0076] Where, is the active power change of the electric heating load; D is the load damping coefficient of the power and frequency response characteristics; Δf * is the per-unit value of the system frequency variation

[0077] The phase shift angle correction unit 04 is used to calculate the offset of the phase shift angle of the semi-controlled power controller based on the power change, and to correct the phase shift angle of the semi-controlled power controller based on the offset; the semi-controlled power controller is used to control the power of the electrolytic cell group by adjusting the phase shift angle.

[0078] Preferably, in the embodiment of the present invention, it further includes:

[0079] The source-load switching unit (not shown in the figure) is used to adjust the system frequency through the charge and discharge control of the energy storage device when the fluctuation amplitude of the current system disturbance is greater than the preset range, and / or to reduce the fluctuation amplitude of the system frequency by switching the power supply and / or the electrolytic cell group.

[0080] Since the working principle and beneficial effects of the system frequency control device for electrolytic hydrogen production in the embodiment of the present invention have been Figure 1 The corresponding system frequency control method for hydrogen production by electrolysis is also recorded and described, so cross-reference can be made and no further details will be given here.

[0081] Example 3

[0082] Corresponding to the method embodiments, embodiments of the present invention also provide a system frequency control device for hydrogen production by electrolysis, such as a terminal, server, etc. The server can be an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms. The terminal can be a smartphone, tablet computer, laptop computer, desktop computer, etc., but is not limited thereto.

[0083] An example diagram of a hardware structure block diagram of a system frequency control device for electrolytic hydrogen production provided by an embodiment of the present invention is shown in FIG. Figure 3 As shown, this may include:

[0084] Processor 1, communication interface 2, memory 3 and communication bus 4;

[0085] The processor 1, the communication interface 2, and the memory 3 communicate with each other via the communication bus 4;

[0086] Optionally, the communication interface 2 may be an interface of a communication module, such as an interface of a GSM module;

[0087] The processor 1 may be a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0088] The memory 3 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0089] The processor 1 is specifically configured to execute the computer program stored in the memory 3 to perform the following steps:

[0090] S11. Obtaining the real-time system frequency of the new energy power system;

[0091] S12. Calculating the fluctuation amplitude of the current system disturbance according to the real-time system frequency and a preset reference system frequency;

[0092] S13. Using the fluctuation amplitude of the current system disturbance as a parameter, calculate the corresponding power variation of the electrolytic cell group in the electrolytic hydrogen production according to a preset power frequency formula; the power frequency formula includes:

[0093]

[0094] Where, is the active power change of the electric heating load; D is the load damping coefficient of the power and frequency response characteristics; Δf * is the per-unit value of the system frequency variation

[0095] S14. Calculate the offset of the phase shift angle of the semi-controlled power controller based on the power change, and correct the phase shift angle of the semi-controlled power controller based on the offset; the semi-controlled power controller is used to control the power of the electrolytic cell group by adjusting the phase shift angle.

[0096] Preferably, in the embodiment of the present invention, it further includes:

[0097] S15. When the fluctuation amplitude of the current system disturbance is greater than a preset range, the system frequency is adjusted by controlling the charge and discharge of the energy storage device, and / or the fluctuation amplitude of the system frequency is reduced by switching the power supply and / or the electrolytic cell group.

[0098] The above-mentioned product can execute the method provided by the embodiment of the present invention and has the functional modules and beneficial effects corresponding to the execution method. For technical details not fully described in this embodiment, please refer to the system frequency control method for electrolytic hydrogen production provided by the embodiment of the present invention.

[0099] Example 4

[0100] In an embodiment of the present invention, a storage medium is further provided. The storage medium may store a program suitable for execution by a processor, wherein the program is used to:

[0101] S11. Obtaining the real-time system frequency of the new energy power system;

[0102] S12. Calculating the fluctuation amplitude of the current system disturbance according to the real-time system frequency and a preset reference system frequency;

[0103] S13. Using the fluctuation amplitude of the current system disturbance as a parameter, calculate the corresponding power variation of the electrolytic cell group in the electrolytic hydrogen production according to a preset power frequency formula; the power frequency formula includes:

[0104]

[0105] Where, is the active power change of the electric heating load; D is the load damping coefficient of the power and frequency response characteristics; Δf * is the per-unit value of the system frequency variation

[0106] S14. Calculate the offset of the phase shift angle of the semi-controlled power controller based on the power change, and correct the phase shift angle of the semi-controlled power controller based on the offset; the semi-controlled power controller is used to control the power of the electrolytic cell group by adjusting the phase shift angle.

[0107] Preferably, in the embodiment of the present invention, it further includes:

[0108] S15. When the fluctuation amplitude of the current system disturbance is greater than a preset range, the system frequency is adjusted by controlling the charge and discharge of the energy storage device, and / or the fluctuation amplitude of the system frequency is reduced by switching the power supply and / or the electrolytic cell group.

[0109] Optionally, the detailed functions and extended functions of the program may refer to the above description.

[0110] The above-mentioned product can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not fully described in this embodiment, please refer to the methods provided by other embodiments of the present invention.

[0111] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0112] In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. Furthermore, the couplings or direct couplings or communication connections shown or discussed may be indirect couplings or communication connections through interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0113] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0114] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0115] It should be understood that in the embodiments of the present application, the various embodiments and features can be combined with each other to solve the aforementioned technical problems.

[0116] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0117] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A system frequency control method for hydrogen production by electrolysis, wherein the hydrogen production by electrolysis is applied to a new energy power system, characterized in that: include: S11. Obtaining the real-time system frequency of the new energy power system; S12. Calculating the fluctuation amplitude of the current system disturbance according to the real-time system frequency and a preset reference system frequency; S13, using the fluctuation amplitude of the current system disturbance as a parameter, calculating the corresponding power change of the electrolytic cell group in the electrolytic hydrogen production according to a preset power frequency formula; The power frequency formula includes: Where, is the active power change of the electric heating load; D is the load damping coefficient of the power and frequency response characteristics; Δf * is the per-unit value of the system frequency variation; S14. Calculate the offset of the phase shift angle of the semi-controlled power controller based on the power change, and correct the phase shift angle of the semi-controlled power controller based on the offset; the semi-controlled power controller is used to control the power of the electrolytic cell group by adjusting the phase shift angle.

2. The system frequency control method for hydrogen production by electrolysis according to claim 1, characterized in that: Also includes: S15. When the fluctuation amplitude of the current system disturbance is greater than a preset range, the system frequency is adjusted by controlling the charge and discharge of the energy storage device, and / or the fluctuation amplitude of the system frequency is reduced by switching the power supply and / or the electrolytic cell group.

3. The system frequency control method for hydrogen production by electrolysis according to claim 2, characterized in that: The half-controlled power controller includes a thyristor phase-shift converter.

4. The system frequency control method for hydrogen production by electrolysis according to claim 1, characterized in that: The load damping coefficient D has a value range of 1.2-1.

8.

5. The system frequency control method for hydrogen production by electrolysis according to claim 4, characterized in that: Determining the preset interval includes: Assume that the rated frequency of the new energy power system is 50 Hz; assume that the minimum acceptable power of the electrolytic cell group is 40% of the rated power, and the corresponding system frequency is 48 Hz; the maximum acceptable power of the electrolytic cell group is 105% of the rated power, and the corresponding system frequency is 51 Hz.

6. The system frequency control method for hydrogen production by electrolysis according to claim 1 or 2, characterized in that: The new energy power source includes a wind power device and / or a photovoltaic power generation device.

7. The system frequency control method for hydrogen production by electrolysis according to claim 6, characterized in that: The step of correcting the phase shift angle of the half-controlled power controller according to the offset comprises: The offset is added to the control amount of the phase shift angle originally used for the full-control power controller to generate the final control amount of the phase shift angle of the full-control power controller.

8. A system frequency control device for electrolytic hydrogen production, wherein the electrolytic hydrogen production is applied to a new energy power system, characterized in that: include: Frequency monitoring unit, used to obtain the real-time system frequency of the new energy power system; an amplitude calculation unit, configured to calculate the fluctuation amplitude of the current system disturbance based on the real-time system frequency and a preset reference system frequency; The power change calculation unit is used to calculate the corresponding power change of the electrolytic cell group in the electrolytic hydrogen production according to the preset power frequency formula using the fluctuation amplitude of the current system disturbance as a parameter; The power frequency formula includes: Where, is the active power change of the electric heating load; D is the load damping coefficient of the power and frequency response characteristics; Δf * is the per-unit value of the system frequency variation; A phase shift angle correction unit is used to calculate the offset of the phase shift angle of the semi-controlled power controller based on the power change, and to correct the phase shift angle of the semi-controlled power controller based on the offset; the semi-controlled power controller is used to control the power of the electrolytic cell group by adjusting the phase shift angle.

9. The system frequency control device for hydrogen production by electrolysis according to claim 8, characterized in that: Also includes: The source-load switching unit is used to adjust the system frequency by controlling the charge and discharge of the energy storage device when the fluctuation amplitude of the current system disturbance is greater than a preset range, and / or to reduce the fluctuation amplitude of the system frequency by switching the power supply and / or the electrolytic cell group.

10. A system frequency control device for electrolytic hydrogen production, characterized in that: include: Memory for storing computer programs; A processor is used to call and execute the computer program to implement the steps of the system frequency control method for electrolysis hydrogen production as described in any one of claims 1 to 7.

11. A storage medium, characterized in that: The system comprises a software program, wherein the software program is suitable for executing, by a processor, the steps of the system frequency control method for producing hydrogen by electrolysis as claimed in any one of claims 1 to 7.

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