AC electrolysis system control method, device and AC electrolysis system

Abstract

The embodiment of the present invention discloses an AC electrolysis system control method, device and AC electrolysis system. The control method of the AC electrolysis system includes obtaining the voltage amplitude of the AC side of the electrolysis rectifier power supply; and adjusting the output parameters of the electrolysis rectifier power supply according to the voltage amplitude. Compared with the prior art, the embodiment of the present invention solves the problems of power imbalance and grid oscillation in the AC electrolysis system, which is conducive to the normal operation of the electrolysis station.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of alternating current electrolysis, and in particular to an alternating current electrolysis system control method and device, and an alternating current electrolysis system. Background Art

[0002] With the change of the world's energy structure, photovoltaic power generation and wind power generation have increasingly become hot spots for in-depth research and vigorous development in various countries. However, due to the intermittent characteristics of new energy sources such as solar energy and wind energy, new energy power stations such as photovoltaic stations and wind power stations have the problem of unstable energy. Therefore, there is a problem of large fluctuations in the AC network that includes new energy power stations. Correspondingly, the same problem also exists when connecting new energy power stations to the AC electrolysis system. Among them, the AC electrolysis system includes an electrolysis station, which rectifies the voltage of the AC network into direct current for electrolysis operations. However, when the electrolysis station is in operation, when the output power of the new energy power station fluctuates, it is easy to cause an imbalance in the power of the AC system, which in turn causes the AC network to oscillate, affecting the normal operation of the electrolysis station. Summary of the invention

[0003] The embodiments of the present invention provide an AC electrolysis system control method, device and AC electrolysis system to solve the problems of power imbalance and grid oscillation in the AC electrolysis system, which is beneficial to the normal operation of the electrolysis station.

[0004] In a first aspect, an embodiment of the present invention provides a control method for an AC electrolysis system, the control method for the AC electrolysis system comprising:

[0005] Obtaining the voltage amplitude of the AC side of the electrolytic rectifier power supply;

[0006] According to the voltage amplitude, the output parameters of the electrolytic rectifier power supply are adjusted.

[0007] Optionally, the control method of the AC electrolysis system further includes: obtaining the execution instruction of the electrolysis rectifier power supply and the actual instruction of the previous beat; the output parameter adjustment method includes:

[0008] Setting a first threshold and a second threshold, wherein the first threshold is greater than the second threshold;

[0009] If the voltage amplitude is greater than or equal to the first threshold, the execution instruction is used to control the output parameter of the electrolytic rectifier power supply;

[0010] If the voltage amplitude is between the first threshold value and the second threshold value, the actual instruction of the previous beat is used to control the output parameter of the electrolytic rectifier power supply;

[0011] If the voltage amplitude is less than the second threshold, the output parameter of the electrolytic rectifier power supply is controlled to be less than the previous beat.

[0012] Optionally, the control method of the AC electrolysis system further includes: obtaining an execution instruction of the electrolysis rectifier power supply; and the output parameter adjustment method includes:

[0013] Setting a first threshold;

[0014] If the voltage amplitude is greater than or equal to the first threshold, the execution instruction is used to control the output parameter of the electrolytic rectifier power supply;

[0015] If the voltage amplitude is less than the first threshold, the output parameter of the electrolytic rectifier power supply is controlled to be less than the previous beat.

[0016] Optionally, the method of controlling the output parameter of the electrolytic rectifier power supply to be less than the previous beat includes:

[0017] Taking the actual instruction of the previous beat as a reference, adjusting the execution instruction to control the output parameter of the electrolytic rectifier power supply to be less than the previous beat;

[0018] And / or, by adjusting the duty cycle of the PWM signal received by the electrolytic rectifier power supply, the output parameter of the electrolytic rectifier power supply is controlled to be smaller than the previous beat; wherein the actual instruction of the previous beat and the execution instruction are converted into the PWM signal to control the electrolytic rectifier power supply.

[0019] Optionally, if the execution instruction and the duty cycle of the PWM signal are adjusted simultaneously, the instruction with the smaller output parameter for controlling the electrolytic rectifier power supply shall prevail.

[0020] Optionally, the method for determining the duty cycle of the PWM signal includes:

[0021] If the electrolytic rectifier power supply is a voltage source type, and when the duty cycle of the PWM signal remains unchanged, the voltage amplitude and the voltage output by the electrolytic rectifier power supply form a first monotonically non-decreasing function; then the duty cycle of the PWM signal and the voltage amplitude form a first monotonically non-increasing function; the voltage amplitude is substituted into the first monotonically non-increasing function to calculate the duty cycle of the PWM signal;

[0022] If the electrolytic rectifier power supply is a voltage source type, and when the duty cycle of the PWM signal remains unchanged, the voltage amplitude and the voltage output by the electrolytic rectifier power supply form a second monotonically non-increasing function; then the duty cycle of the PWM signal and the voltage amplitude form a second monotonically non-decreasing function; the voltage amplitude is substituted into the second monotonically non-decreasing function to calculate the duty cycle of the PWM signal;

[0023] If the electrolytic rectifier power supply is a current source type, and when the duty cycle of the PWM signal remains unchanged, the voltage amplitude and the current output by the electrolytic rectifier power supply form a third monotonically non-decreasing function, then the duty cycle of the PWM signal and the voltage amplitude form a third monotonically non-increasing function; the voltage amplitude is substituted into the third monotonically non-increasing function to calculate the duty cycle of the PWM signal;

[0024] If the electrolytic rectifier power supply is a current source type, and when the duty cycle of the PWM signal remains unchanged, the voltage amplitude and the current output by the electrolytic rectifier power supply constitute a fourth monotonically non-increasing function, then the duty cycle of the PWM signal and the voltage amplitude constitute a fourth monotonically non-decreasing function; the voltage amplitude is substituted into the fourth monotonically non-decreasing function to calculate the duty cycle of the PWM signal.

[0025] Optionally, the control method of the AC electrolysis system further includes: obtaining an execution instruction of the electrolysis rectifier power supply; and the output parameter adjustment method includes:

[0026] Calculating an upper limit value of the output parameter according to the voltage amplitude;

[0027] If the output parameter corresponding to the execution instruction is greater than the upper limit value of the output parameter, then controlling the electrolytic rectifier power supply to output the upper limit value of the output parameter;

[0028] If the output parameter corresponding to the execution instruction is less than or equal to the upper limit value of the output parameter, the execution instruction is used to control the output parameter of the electrolytic rectifier power supply.

[0029] Optionally, the voltage amplitude and the upper limit value of the output parameter form a monotonically non-decreasing function;

[0030] Substitute the voltage amplitude into the monotonically non-decreasing function to calculate the output parameter upper limit value.

[0031] Optionally, the method for adjusting the output parameter includes:

[0032] Calculate a matching execution instruction value according to the voltage amplitude;

[0033] The execution instruction value is used to control the output parameter of the electrolytic rectifier power supply.

[0034] Optionally, the voltage amplitude and the execution instruction value form a monotonically non-decreasing function;

[0035] Substituting the voltage amplitude into the monotonically non-decreasing function, the execution instruction value is calculated.

[0036] Optionally, the coefficients in the monotonically non-decreasing function are determined by the rated value of the voltage amplitude and the rated value of the output parameter.

[0037] Optionally, the output parameter includes at least one of output power, output voltage and output current.

[0038] Optionally, the method for obtaining the voltage amplitude includes:

[0039] Detecting the three-phase instantaneous voltage value on the AC side of the electrolytic rectifier power supply;

[0040] The voltage amplitude is calculated according to the three-phase instantaneous voltage values.

[0041] In a second aspect, an embodiment of the present invention further provides a control device for an AC electrolysis system, the control device for the AC electrolysis system comprising:

[0042] A voltage amplitude acquisition module is used to acquire the voltage amplitude of the AC side of the electrolytic rectifier power supply;

[0043] The output parameter adjustment module is used to adjust the output parameters of the electrolytic rectifier power supply according to the voltage amplitude.

[0044] In a third aspect, an embodiment of the present invention further provides an AC electrolysis system, the AC electrolysis system comprising:

[0045] New energy station;

[0046] An electrolysis station, comprising an electrolytic cell, an electrolysis rectifier power supply and a controller, wherein the electrolysis rectifier power supply is connected between the new energy station and the electrolytic cell, and the controller executes the control method provided in any embodiment of the present invention.

[0047] Optionally, the new energy station includes: at least one of a photovoltaic station and a wind power station.

[0048] Optionally, the electrolysis station further comprises an AC switch cabinet and a transformer connected in series between the new energy station and the electrolysis rectifier power supply;

[0049] The voltage amplitude is the voltage amplitude of the AC voltage at the input end of the AC switch cabinet, the voltage amplitude of the AC voltage on the primary side of the transformer, or the voltage amplitude on the secondary side of the transformer.

[0050] The embodiment of the present invention provides a control method for an AC electrolysis system, which obtains the voltage amplitude of the AC side of the electrolysis rectifier power supply and adjusts the output parameters of the electrolysis rectifier power supply according to the voltage amplitude, thereby achieving power matching between the electrolysis power of the electrolysis station and the AC network. Therefore, when the AC network has a large power fluctuation, the embodiment of the present invention can timely control the electrolysis rectifier power supply to match the power fluctuation of the AC network, solve the problem of grid oscillation caused by the power imbalance of the AC electrolysis system, and thus facilitate the normal operation of the electrolysis station. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is a flow chart of an AC electrolysis system control method provided by an embodiment of the present invention;

[0052] Figure 2 is a flow chart of another control method of an AC electrolysis system provided by an embodiment of the present invention;

[0053] Figure 3 is a flow chart of another control method of an AC electrolysis system provided by an embodiment of the present invention;

[0054] Figure 4 is a flow chart of another control method of an AC electrolysis system provided by an embodiment of the present invention;

[0055] Figure 5 is a flow chart of another control method of an AC electrolysis system provided by an embodiment of the present invention;

[0056] Figure 6 is a flow chart of another control method of an AC electrolysis system provided by an embodiment of the present invention;

[0057] Figure 7 It is a structural schematic diagram of an AC electrolysis system control device provided by an embodiment of the present invention;

[0058] Figure 8 is a structural schematic diagram of an AC electrolysis system provided by an embodiment of the present invention;

[0059] Fig. 9 is a structural schematic diagram of another AC electrolysis system provided by an embodiment of the present invention;

[0060] Fig.10 It is a structural schematic diagram of another AC electrolysis system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0061] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0062] Figure 1 1 is a flow chart of a control method for an AC electrolysis system provided by an embodiment of the present invention. The control method for an AC electrolysis system can be executed by a control device for the AC electrolysis system, and the device can be implemented by software and / or hardware. Figure 1 , the specific steps of the control method are as follows:

[0063] S110, obtaining the voltage amplitude of the AC side of the electrolytic rectifier power supply.

[0064] Among them, the electrolysis station refers to a site that uses direct current for electrolysis operations, for example, the electrolysis station can be used for electrolysis of hydrogen, electrolysis of copper, etc. The electrolysis rectifier power supply refers to a rectifier used to power the electrolysis station, and its function is to convert the alternating current of the alternating current network into direct current. The type of electrolysis rectifier power supply can be a voltage source type (VSR) or a current source type (CSR). Whether it is a voltage source type electrolysis rectifier power supply or a current source type electrolysis rectifier power supply, it includes a semiconductor switching device, and the switching direction of the voltage or current is controlled by controlling the on and off of the semiconductor switching device. Exemplarily, when the electrolysis rectifier power supply is controlled, a PWM signal is generated according to the execution instruction using a two-stage loop control method to control the on and off of the semiconductor switch device. The difference is that the DC side of the voltage source type electrolysis rectifier power supply adopts capacitor filtering, and the output end of the current source type electrolysis rectifier power supply adopts an inductor as an energy storage element.

[0065] The voltage amplitude is the maximum absolute value of the alternating current that occurs instantaneously in one cycle, and is also a sine wave, half the distance from the peak to the trough. Exemplarily, the method for obtaining the voltage amplitude includes: detecting the three-phase instantaneous voltage value on the AC side of the electrolytic rectifier power supply; and calculating the voltage amplitude based on the three-phase instantaneous voltage value. Among them, a detection device such as a mutual inductor can be used to detect the three-phase instantaneous voltage value, and the voltage amplitude is calculated based on the three-phase instantaneous voltage value through a phase-locked loop algorithm.

[0066] S120, adjusting the output parameters of the electrolytic rectifier power supply according to the voltage amplitude.

[0067] Among them, different voltage amplitudes indicate different powers provided by the AC grid, and the electrolysis power of the electrolysis station should match the power of the AC grid. If the voltage amplitude is low, the electrolysis power of the electrolysis station is large; or, if the voltage amplitude is high, the electrolysis power of the electrolysis station is low, both will cause power imbalance in the AC grid, thus causing AC grid oscillation.

[0068] Adjusting the output parameters of the electrolytic rectifier power supply can be done, for example, by adjusting the execution instruction or directly adjusting the duty cycle of the PWM signal to adjust its operating state. The output parameter can be, for example, at least one of output power, output voltage, output current, etc., and accordingly, the execution instruction is at least one of the output electrolytic power execution instruction Pref, the output voltage execution instruction Vref, the output current execution instruction Iref, etc.

[0069] In summary, the embodiment of the present invention provides a control method for an AC electrolysis system, which obtains the voltage amplitude on the AC side of the electrolysis rectifier power supply and adjusts the output parameters of the electrolysis rectifier power supply according to the voltage amplitude, thereby achieving power matching between the electrolysis power of the electrolysis station and the AC grid. Therefore, when the AC grid experiences a large power fluctuation, the embodiment of the present invention can timely control the electrolysis rectifier power supply to match the power fluctuation of the AC grid, thereby solving the problem of grid oscillation caused by power imbalance of the AC electrolysis system.

[0070] In the above embodiments, there are many ways to adjust the output parameters of the electrolytic rectifier power supply according to the voltage amplitude. Several of them are described below, but they are not intended to limit the present invention.

[0071] In one embodiment of the present invention, optionally, the control method of the AC electrolysis system also includes: obtaining the execution instruction of the electrolysis rectifier power supply, and the actual instruction of the previous beat; the output parameter adjustment method includes: setting a first threshold and a second threshold, the first threshold is greater than the second threshold; if the voltage amplitude is greater than or equal to the first threshold, the execution instruction is used to control the output parameter of the electrolysis rectifier power supply; if the voltage amplitude is between the first threshold and the second threshold, the actual instruction of the previous beat is used to control the output parameter of the electrolysis rectifier power supply; if the voltage amplitude is less than the second threshold, the output parameter of the electrolysis rectifier power supply is controlled to be less than the previous beat.

[0072] The setting of the first threshold and the second threshold defines different ranges of the voltage amplitude, specifically, three numerical ranges may be included, namely, greater than the first threshold (first numerical range), between the first threshold and the second threshold (second numerical range), and less than the second threshold (third numerical range). The selection of the threshold boundary may be set as required, for example, a voltage amplitude equal to the first threshold may be included in the first numerical range or the second numerical range; a voltage amplitude equal to the second threshold may be included in the second threshold range or the third numerical range. Exemplarily, the first threshold may be selected as 90% of the rated value of the voltage amplitude, and the second threshold may be selected as 80% of the rated value of the voltage amplitude.

[0073] Figure 2 FIG. 1 is a flow chart of another control method of an AC electrolysis system provided by an embodiment of the present invention. Figure 2 Specifically, the control method comprises the following steps:

[0074] S201, detecting the three-phase instantaneous voltage value on the AC side of the electrolysis rectifier power supply, and receiving at least one of the electrolysis power command Pref, the voltage command Vref and the current command Iref.

[0075] S202: Calculate the voltage amplitude Vgrid according to the three-phase instantaneous voltage values.

[0076] S203, determine the range of the voltage amplitude Vgrid. If the voltage amplitude Vgrid is greater than or equal to the first threshold, execute S204; if the voltage amplitude Vgrid is greater than or equal to the second threshold and less than the first threshold, execute S205; if the voltage amplitude Vgrid is less than the second threshold, execute S206.

[0077] S204, using at least one of the electrolysis power execution instruction Pref, the voltage execution instruction Vref and the current execution instruction Iref to control the output parameters of the electrolysis rectifier power supply.

[0078] The voltage amplitude Vgrid being greater than or equal to the first threshold value means that the voltage amplitude Vgrid is close to the rated value and can meet the requirements of the output parameters of the electrolysis station. Therefore, the electrolysis rectifier power supply can be controlled according to the execution instruction.

[0079] S205, using at least one of the actual electrolysis power instruction Pref, voltage instruction Vref and current instruction Iref of the previous beat to control the output parameters of the electrolysis rectifier power supply.

[0080] Among them, the voltage amplitude Vgrid is between the first threshold value and the second threshold value, which means that the voltage amplitude Vgrid is lower than the rated value to a certain extent, but not too low, and the working state of the previous beat can be maintained at this time. In this way, the efficient operation of the electrolysis station can be maintained on the basis of basically maintaining the power matching between the electrolysis power of the electrolysis station and the power of the AC grid. Therefore, in this case, the electrolysis rectifier power supply can be controlled according to the execution instruction of the previous beat.

[0081] S206, controlling the output parameter of the electrolytic rectifier power supply to be smaller than the previous beat.

[0082] Among them, the voltage amplitude Vgrid being less than the second threshold value means that the voltage amplitude Vgrid is very low, and the output parameters of the electrolysis rectifier power supply need to be further reduced to maintain the power matching between the electrolysis power of the electrolysis station and the AC grid. At the same time, the embodiment of the present invention controls the output parameters of the electrolysis rectifier power supply to be less than the previous beat, and the output parameters of the electrolysis rectifier power supply can be controlled to be gradually reduced, which is conducive to the stable operation of the electrolysis rectifier power supply. Exemplarily, the value of the execution instruction is reduced on the basis of the actual execution instruction of the previous beat, so as to control the output parameters of the electrolysis rectifier power supply to become smaller.

[0083] S207, recording at least one of the current actual electrolysis power command Pref, voltage command Vref and current command Iref.

[0084] It can be seen from S201-S207 that the embodiment of the present invention divides the voltage amplitude into ranges and adjusts the execution instructions according to different voltage ranges. The embodiment of the present invention realizes the gradual adjustment of the electrolysis rectifier power supply, and realizes the stable operation of the electrolysis rectifier power supply on the basis of satisfying the power matching between the electrolysis power of the electrolysis station and the AC grid.

[0085] In the above embodiment, two threshold parameters, the first threshold and the second threshold, and three numerical ranges are set, which are not limitations of the present invention. In other embodiments, if the first threshold and the second threshold are equal, the three numerical ranges can be simplified to two numerical ranges, i.e., greater than the first threshold (first numerical range) and less than the first threshold (second numerical range). The selection of the threshold boundary can be set as needed. For example, the voltage amplitude equal to the first threshold can be included in the first numerical range or the second numerical range. Exemplarily, the first threshold can be selected as 90% of the rated value of the voltage amplitude.

[0086] Exemplarily, the control method of the AC electrolysis system also includes: obtaining an execution instruction of the electrolysis rectifier power supply; the output parameter adjustment method includes: setting a first threshold; if the voltage amplitude is greater than or equal to the first threshold, using the execution instruction to control the output parameter of the electrolysis rectifier power supply; if the voltage amplitude is less than the first threshold, controlling the output parameter of the electrolysis rectifier power supply to be less than the previous beat.

[0087] Figure 3 is a flow chart of another control method of an AC electrolysis system provided by an embodiment of the present invention, with reference to Figure 3 Specifically, the control method comprises the following steps:

[0088] S301, detecting the three-phase instantaneous voltage value of the AC side of the electrolysis rectifier power supply, and receiving at least one of the electrolysis power command Pref, the voltage command Vref and the current command Iref.

[0089] S302: Calculate the voltage amplitude Vgrid according to the three-phase instantaneous voltage values.

[0090] S303, determine the range of the voltage amplitude Vgrid. If the voltage amplitude Vgrid is greater than or equal to the first threshold, execute S304; if the voltage amplitude Vgrid is less than the first threshold, execute S305.

[0091] S304, using at least one of the electrolysis power execution instruction Pref, the voltage execution instruction Vref and the current execution instruction Iref to control the output parameters of the electrolysis rectifier power supply.

[0092] The voltage amplitude Vgrid being greater than or equal to the first threshold value means that the voltage amplitude Vgrid is close to the rated value and can meet the requirements of the output parameters of the electrolysis station. Therefore, the electrolysis rectifier power supply can be controlled according to the execution instruction.

[0093] S305, controlling the output parameter of the electrolytic rectifier power supply to be smaller than the previous beat.

[0094] Among them, the voltage amplitude Vgrid being less than the first threshold value means that the voltage amplitude Vgrid is low, which generally cannot meet the requirements of the output parameters of the electrolysis station, and it is necessary to further reduce the output parameters of the electrolysis rectifier power supply to maintain the power matching between the electrolysis power of the electrolysis station and the AC grid. At the same time, the embodiment of the present invention controls the output parameters of the electrolysis rectifier power supply to be less than the previous beat, and the output parameters of the electrolysis rectifier power supply can be controlled to be gradually reduced, which is conducive to the stable operation of the electrolysis rectifier power supply. Exemplarily, the value of the execution instruction is reduced on the basis of the actual execution instruction of the previous beat, so as to control the output parameters of the electrolysis rectifier power supply to become smaller.

[0095] S306. Record at least one of the current actual electrolysis power command Pref, voltage command Vref, and current command Iref.

[0096] It can be seen from S301-S306 that the embodiment of the present invention divides the voltage amplitude into ranges and adjusts the execution instructions according to different voltage ranges. The embodiment of the present invention realizes the gradual adjustment of the electrolysis rectifier power supply, and realizes the stable operation of the electrolysis rectifier power supply on the basis of satisfying the power matching between the electrolysis power of the electrolysis station and the AC grid.

[0097] In the above embodiments, there are many methods for controlling the output parameter of the electrolytic rectifier power supply to be less than the previous beat, which are described in detail below but are not intended to limit the present invention.

[0098] In one embodiment of the present invention, optionally, the method for controlling the output parameter of the electrolytic rectifier power supply to be less than the previous beat includes: taking the actual instruction of the previous beat as a reference benchmark, adjusting the execution instruction, so as to control the output parameter of the electrolytic rectifier power supply to be less than the previous beat. Among them, the actual instruction of the previous beat is set as a reference benchmark, and the execution instruction is adaptively adjusted to control the output parameter of the electrolytic rectifier power supply to be less than the previous beat. Specifically, the actual instruction of the previous beat can be converted into a PWM signal, and the PWM signal controls the semiconductor switching device in the electrolytic rectifier power supply, and the output parameter of the electrolytic rectifier power supply is controlled by the switching state of the semiconductor switching device.

[0099] And / or, the method of controlling the output parameter of the electrolytic rectifier power supply to be less than the previous beat includes: adjusting the duty cycle of the PWM signal received by the electrolytic rectifier power supply to control the output parameter of the electrolytic rectifier power supply to be less than the previous beat. Among them, the method of adjusting the duty cycle of the PWM signal is equivalent to skipping the process of converting the execution instruction into the PWM signal, and the control method is more direct, therefore, it is conducive to improving the response speed of the electrolytic rectifier power supply.

[0100] It can be seen that one of the above two adjustment methods can be used to control the output parameters of the electrolytic rectifier power supply, or both adjustment methods can be used simultaneously for control.

[0101] Optionally, if the duty cycle of the execution instruction and the PWM signal are adjusted at the same time, the instruction with the smaller output parameter of the electrolysis rectifier power supply is used as the standard. Wherein, due to the different adjustment modes of the duty cycle of the execution instruction and the PWM signal, the problem of different control results in the two cases may occur. At this time, the instruction with the smaller output parameter of the electrolysis rectifier power supply is used as the standard, which is conducive to satisfying the matching of the electrolysis power of the electrolysis station with the power of the AC network, and is also conducive to the stable operation of the electrolysis rectifier power supply.

[0102] On the basis of the above embodiments, those skilled in the art can understand that the voltage output by the electrolytic rectifier power supply is not only related to the voltage amplitude, but also to the duty cycle of the PWM signal. Therefore, adjusting any one of the duty cycle and the voltage amplitude of the PWM signal can achieve the adjustment of the output voltage of the electrolytic rectifier power supply. When the voltage amplitude fluctuates, the change of the output voltage of the electrolytic rectifier power supply can be suppressed by adjusting the duty cycle of the PWM signal. Among them, when the voltage amplitude remains unchanged, according to the different topological structures, there are many forms of the relationship between the duty cycle of the PWM signal and the voltage output by the electrolytic rectifier power supply. However, the inventors have found that the functional relationship between the duty cycle of the PWM signal and the voltage amplitude Vgrid is determined. That is to say, in order to achieve the voltage output by the electrolytic rectifier power supply to remain unchanged, when the voltage amplitude Vgrid changes, the voltage output by the electrolytic rectifier power supply can be adjusted by adjusting the duty cycle of the PWM signal. The functional relationship between the duty cycle of the PWM signal and the voltage amplitude Vgrid is defined according to different types of electrolytic rectifier power supplies, thereby realizing the determination of the duty cycle of the PWM signal.

[0103] In one embodiment, if the electrolytic rectifier power supply is a voltage source type, and when the duty cycle of the PWM signal remains unchanged, the voltage amplitude and the voltage output by the electrolytic rectifier power supply constitute a first monotonically non-decreasing function; then the duty cycle of the PWM signal and the voltage amplitude constitute a first monotonically non-increasing function; the voltage amplitude is substituted into the first monotonically non-increasing function to calculate the duty cycle of the PWM signal.

[0104] Among them, a monotonically non-decreasing function means that for the function f(x), for any two independent variable values ​​x1 and x2, when x1>x2, f(x1)≥f(x2). On the contrary, a monotonically non-increasing function means that for the function f(x), for any two independent variable values ​​x1 and x2, when x1>x2, f(x1)≤f(x2). When the duty cycle duty of the PWM signal remains unchanged, the voltage amplitude Vgrid and the output voltage of the electrolytic rectifier power supply constitute a first monotonically non-decreasing function, which means that the output voltage of the electrolytic rectifier power supply increases with the increase of the voltage amplitude Vgrid. The duty cycle of the PWM signal and the voltage amplitude constitute a first monotonically non-increasing function, which means that the duty cycle of the PWM signal decreases with the increase of the voltage amplitude Vgrid.

[0105] In another embodiment, if the electrolytic rectifier power supply is a voltage source type, and when the duty cycle of the PWM signal remains unchanged, the voltage amplitude and the voltage output by the electrolytic rectifier power supply constitute a second monotonically non-increasing function; then the duty cycle of the PWM signal and the voltage amplitude constitute a second monotonically non-decreasing function; the voltage amplitude is substituted into the second monotonically non-decreasing function to calculate the duty cycle of the PWM signal.

[0106] In another embodiment, if the electrolytic rectifier power supply is a current source type, and when the duty cycle of the PWM signal remains unchanged, the voltage amplitude and the current output by the electrolytic rectifier power supply constitute a third monotonic non-decreasing function, then the duty cycle of the PWM signal and the voltage amplitude constitute a third monotonic non-increasing function; the voltage amplitude is substituted into the third monotonic non-increasing function to calculate the duty cycle of the PWM signal.

[0107] In another embodiment, if the electrolytic rectifier power supply is a current source type, and when the duty cycle of the PWM signal remains unchanged, the voltage amplitude and the current output by the electrolytic rectifier power supply constitute a fourth monotonic non-increasing function, then the duty cycle of the PWM signal and the voltage amplitude constitute a fourth monotonic non-decreasing function; the voltage amplitude is substituted into the fourth monotonic non-decreasing function to calculate the duty cycle of the PWM signal.

[0108] In one embodiment of the present invention, optionally, the control method of the AC electrolysis system also includes: obtaining an execution instruction of the electrolysis rectifier power supply; the output parameter adjustment method includes: calculating the upper limit value of the output parameter based on the voltage amplitude; if the output parameter corresponding to the execution instruction is greater than the upper limit value of the output parameter, then the electrolysis rectifier power supply is controlled to output the upper limit value of the output parameter; if the output parameter corresponding to the execution instruction is less than or equal to the upper limit value of the output parameter, then the execution instruction is used to control the output parameter of the electrolysis rectifier power supply.

[0109] Among them, since the execution instruction corresponds to the output parameter, the corresponding execution instruction can be determined according to the upper limit value of the output parameter. In the following description, in order to simplify the expression, the execution instruction corresponding to the upper limit value of the output parameter is defined as the upper limit value of the execution instruction. It can be seen that, unlike the previous embodiment, the upper limit value of the execution instruction is set according to the voltage amplitude in this embodiment, so that the output parameter of the electrolytic rectifier power supply matches the AC grid.

[0110] Figure 4 is a flow chart of another control method of an AC electrolysis system provided by an embodiment of the present invention, with reference to Figure 4 Specifically, the control method comprises the following steps:

[0111] S401, detecting the three-phase instantaneous voltage value of the AC side of the electrolysis rectifier power supply, and receiving at least one of the electrolysis power command Pref, the voltage command Vref and the current command Iref.

[0112] S402: Calculate the voltage amplitude Vgrid according to the three-phase instantaneous voltage values.

[0113] S403, calculating an upper limit value (including at least one of an electrolysis power upper limit value Pref_max, a voltage upper limit value Vref_max, and a current upper limit value Iref_max) according to the voltage amplitude Vgrid.

[0114] S404, determine the magnitude relationship between the execution instruction value and the upper limit value. If the execution instruction value is greater than the upper limit value, execute S405; otherwise, execute S406.

[0115] S405, using at least one of the electrolysis rectifier power output electrolysis power upper limit value Pref_max, voltage upper limit value Vref_max and current upper limit value Iref_max to control the output parameters of the electrolysis rectifier power supply.

[0116] S406, using at least one of the electrolysis power command Pref, the voltage command Vref and the current command ref to control the output parameters of the electrolysis rectifier power supply.

[0117] It can be seen from S401-S406 that the embodiment of the present invention compares the numerical values ​​of the execution instruction value and the upper limit value, controls the electrolysis rectifier power supply to output corresponding parameters according to different situations, and realizes the stable operation of the electrolysis rectifier power supply on the basis of satisfying the power matching between the electrolysis power of the electrolysis station and the AC grid.

[0118] In the above embodiment, optionally, the voltage amplitude and the upper limit value of the output parameter constitute a monotonically non-decreasing function; the voltage amplitude is substituted into the monotonically non-decreasing function to calculate the upper limit value of the output parameter. Exemplarily, the coefficients in the monotonically non-decreasing function are determined by the rated value of the voltage amplitude and the rated value of the output parameter.

[0119] Taking the upper limit value of the electrolysis power upper limit value Pref_max as an example, the relationship between the voltage amplitude Vgrid and the electrolysis power instruction Pref or the electrolysis power upper limit value Pref_max can be represented by a function function2: Pref=function2(Vgrid), or Pref_max=function2(Vgrid).

[0120] Among them, function 2 is a monotonically non-decreasing function, that is, a unique voltage amplitude Vgrid corresponds to a unique electrolysis power command Pref (or electrolysis power upper limit Pref_max). Among them, Pref = Vgrid / Vgrid_N*Pref_N, and the upper limit is Pref_N, and the lower limit is 0. Vgird_N is the rated value of the voltage amplitude Vgrid, and Pref_N is the rated value of the electrolysis power command Pref.

[0121] It should be noted that in the above embodiments, the execution instruction may be manually set, or may be automatically calculated by the control system of the electrolysis station and then sent to the electrolysis rectifier power supply, and the present invention does not limit this.

[0122] In one embodiment of the present invention, optionally, the method for adjusting the output parameters includes: calculating a matching execution instruction value according to the voltage amplitude; and controlling the output parameters of the electrolytic rectifier power supply using the execution instruction value. Different from the above embodiments, this embodiment directly determines the execution instruction value according to the voltage amplitude so that the output parameters of the electrolytic rectifier power supply match the AC grid.

[0123] Figure 5 is a flow chart of another control method of an AC electrolysis system provided by an embodiment of the present invention, with reference to Figure 5 Specifically, the control method comprises the following steps:

[0124] S501, detecting the three-phase instantaneous voltage value on the AC side of the electrolytic rectifier power supply.

[0125] S502: Calculate the voltage amplitude Vgrid according to the three-phase instantaneous voltage values.

[0126] S503. Calculate at least one of the electrolysis power command value Pref, the voltage command value Vref, and the current command value Iref according to the voltage amplitude Vgrid.

[0127] S504, using at least one of the electrolysis power command value Pref, the voltage command value Vref and the current command value Iref to control the output parameters of the electrolysis rectifier power supply.

[0128] It can be seen from S501-S504 that the embodiment of the present invention directly determines the execution instruction value through the voltage amplitude Vgrid, controls the electrolysis rectifier power supply to output corresponding parameters according to different situations, and realizes the stable operation of the electrolysis rectifier power supply on the basis of satisfying the power matching between the electrolysis power of the electrolysis station and the AC grid.

[0129] Figure 6 is a flow chart of another control method of an AC electrolysis system provided by an embodiment of the present invention, with reference to Figure 6 Specifically, the control method comprises the following steps:

[0130] S601, detecting the three-phase instantaneous voltage value on the AC side of the electrolytic rectifier power supply.

[0131] S602: Calculate the voltage amplitude Vgrid according to the three-phase instantaneous voltage values.

[0132] S603. Calculate at least one of the electrolysis power command value Pref, the voltage command value Vref, and the current command value Iref according to the voltage amplitude Vgrid.

[0133] S604: Send instruction value.

[0134] S605, receiving at least one of the electrolysis power command value Pref, the voltage command value Vref, and the current command value Iref.

[0135] S606, executing at least one of the electrolysis power command value Pref, the voltage command value Vref, and the current command value Iref.

[0136] Depend on Figure 5 and Figure 6 It can be seen that the step of calculating the execution instruction can be executed in the electrolysis instruction setting device or in the control device of the electrolysis rectifier power supply; the step of executing the instruction value is executed in the control device of the electrolysis rectifier power supply.

[0137] Optionally, the voltage amplitude and the execution instruction value form a monotonically non-decreasing function; the voltage amplitude is substituted into the monotonically non-decreasing function to calculate the execution instruction value. Optionally, the output parameter includes at least one of output power, output voltage and output current.

[0138] An embodiment of the present invention further provides a control device for an AC electrolysis system, which can be implemented by software and / or hardware and is used to execute the control method provided by any embodiment of the present invention. Its technical principles and effects are similar and will not be repeated here. Figure 7 is a schematic diagram of the structure of an AC electrolysis system control device provided by an embodiment of the present invention, with reference to Figure 7 , the control device 700 of the AC electrolysis system includes:

[0139] The voltage amplitude acquisition module 701 is used to acquire the voltage amplitude of the AC side of the electrolytic rectifier power supply;

[0140] The output parameter adjustment module 702 is used to adjust the output parameters of the electrolytic rectifier power supply according to the voltage amplitude.

[0141] Optionally, the voltage amplitude acquisition module is further used for:

[0142] Detect the three-phase instantaneous voltage value on the AC side of the electrolytic rectifier power supply;

[0143] Calculate the voltage amplitude based on the three-phase instantaneous voltage values.

[0144] Optionally, the control device of the AC electrolysis system further includes: an instruction acquisition module, which is used to acquire the execution instruction of the electrolysis rectifier power supply and the actual instruction of the previous beat; the output parameter adjustment module is also used to:

[0145] Setting a first threshold and a second threshold, wherein the first threshold is greater than the second threshold;

[0146] If the voltage amplitude is greater than or equal to the first threshold, the execution instruction is used to control the output parameters of the electrolytic rectifier power supply;

[0147] If the voltage amplitude is between the first threshold value and the second threshold value, the actual instruction of the previous beat is used to control the output parameters of the electrolytic rectifier power supply;

[0148] If the voltage amplitude is less than the second threshold value, the output parameter of the electrolytic rectifier power supply is controlled to be less than the previous beat.

[0149] Optionally, the control device of the AC electrolysis system further includes: an instruction acquisition module for acquiring an execution instruction of the electrolysis rectifier power supply; and the output parameter adjustment module is further used for:

[0150] Setting a first threshold;

[0151] If the voltage amplitude is greater than or equal to the first threshold, the execution instruction is used to control the output parameters of the electrolytic rectifier power supply;

[0152] If the voltage amplitude is less than the first threshold, the output parameter of the electrolytic rectifier power supply is controlled to be less than the previous beat.

[0153] Optionally, the method of controlling the output parameter of the electrolytic rectifier power supply to be less than the previous beat includes:

[0154] Taking the actual instruction of the previous beat as a reference, adjusting the execution instruction to control the output parameter of the electrolytic rectifier power supply to be less than the previous beat;

[0155] And / or, by adjusting the duty cycle of the PWM signal received by the electrolytic rectifier power supply, the output parameter of the electrolytic rectifier power supply is controlled to be smaller than the previous beat; wherein the actual instructions and execution instructions of the previous beat are converted into PWM signals to control the electrolytic rectifier power supply.

[0156] Optionally, if the execution instruction and the duty cycle of the PWM signal are adjusted simultaneously, the instruction with the smaller output parameter of the electrolytic rectifier power supply shall prevail.

[0157] Optionally, the method for determining the duty cycle of the PWM signal includes:

[0158] If the electrolytic rectifier power supply is a voltage source type, and the voltage amplitude and the voltage output by the electrolytic rectifier power supply form a first monotonically non-decreasing function when the duty cycle of the PWM signal remains unchanged; then the duty cycle of the PWM signal and the voltage amplitude form a first monotonically non-increasing function; the voltage amplitude is substituted into the first monotonically non-increasing function to calculate the duty cycle of the PWM signal;

[0159] If the electrolytic rectifier power supply is a voltage source type, and the voltage amplitude and the voltage output by the electrolytic rectifier power supply form a second monotonically non-increasing function when the duty cycle of the PWM signal remains unchanged; then the duty cycle of the PWM signal and the voltage amplitude form a second monotonically non-decreasing function; the voltage amplitude is substituted into the second monotonically non-decreasing function to calculate the duty cycle of the PWM signal;

[0160] If the electrolytic rectifier power supply is a current source type, and the voltage amplitude and the current output by the electrolytic rectifier power supply form a third monotonically non-decreasing function when the duty cycle of the PWM signal remains unchanged, then the duty cycle of the PWM signal and the voltage amplitude form a third monotonically non-increasing function; the voltage amplitude is substituted into the third monotonically non-increasing function to calculate the duty cycle of the PWM signal;

[0161] If the electrolytic rectifier power supply is a current source type, and when the duty cycle of the PWM signal remains unchanged, the voltage amplitude and the current output by the electrolytic rectifier power supply constitute a fourth monotonically non-increasing function, then the duty cycle of the PWM signal and the voltage amplitude constitute a fourth monotonically non-decreasing function; substitute the voltage amplitude into the fourth monotonically non-decreasing function to calculate the duty cycle of the PWM signal.

[0162] Optionally, the control method of the AC electrolysis system further includes: obtaining an execution instruction of the electrolysis rectifier power supply; and the method for adjusting the output parameters includes:

[0163] Calculate the upper limit value of the output parameter according to the voltage amplitude;

[0164] If the output parameter corresponding to the execution instruction is greater than the upper limit value of the output parameter, the electrolytic rectifier power supply is controlled to output the upper limit value of the output parameter;

[0165] If the output parameter corresponding to the execution instruction is less than or equal to the upper limit value of the output parameter, the execution instruction is used to control the output parameter of the electrolytic rectifier power supply.

[0166] Optionally, the voltage amplitude and the upper limit value of the output parameter form a monotonically non-decreasing function;

[0167] Substitute the voltage amplitude into the monotonically non-decreasing function and calculate the upper limit of the output parameter.

[0168] Optionally, the method for adjusting the output parameters includes:

[0169] Calculate the matching execution instruction value according to the voltage amplitude;

[0170] The output parameters of the electrolytic rectifier power supply are controlled by executing the command value.

[0171] Optionally, the voltage amplitude and the execution instruction value form a monotonically non-decreasing function;

[0172] Substitute the voltage amplitude into the monotonically non-decreasing function and calculate the execution instruction value.

[0173] Optionally, the coefficients in the monotonically non-decreasing function are determined by a rated value of the voltage amplitude and a rated value of the output parameter.

[0174] Optionally, the output parameter includes at least one of output power, output voltage and output current.

[0175] The above-mentioned device can execute the method provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0176] Based on the above embodiments, the present invention further provides an AC electrolysis system. Figure 8 is a schematic diagram of the structure of an AC electrolysis system provided by an embodiment of the present invention, with reference to Figure 8 , the AC electrolysis system comprises:

[0177] New energy station 80;

[0178] Electrolysis station 804, electrolysis station 804 includes an electrolytic cell, an electrolytic rectifier power supply and a controller, and the electrolytic rectifier power supply is connected between the new energy station 80 and the electrolytic cell. Exemplarily, electrolysis station 804 may also include hydrogen production devices such as post-processing and purification. The controller executes the control method provided by any embodiment of the present invention, which has the same beneficial effects as the method, and will not be repeated here.

[0179] Among them, the new energy station 80 can be a photovoltaic station 801 or a wind power station 802, and the electrolysis station 804 refers to a station that uses direct current for electrolysis operations. For example, the electrolysis station 804 can be used for electrolysis of hydrogen, electrolysis of copper, etc.

[0180] When the power generation of the photovoltaic station 801 and the wind power station 802 changes due to changes in light and wind power, the electrolysis station 804 cannot obtain the output power of the photovoltaic station 801 and the wind power station 802 in real time due to delays in communication transmission, which can easily lead to power imbalance in the AC system and cause AC network oscillation.

[0181] By using a controller to execute the control method provided by any embodiment of the present invention, the electrolytic rectifier power supply adjusts the electrolytic power, voltage and / or current according to the voltage amplitude of the AC network in accordance with the control strategy, effectively solving the problem of power imbalance in the AC system and causing AC network oscillation.

[0182] Continue to refer Figure 8 Optionally, the new energy station 80 includes: at least one of a photovoltaic station 801 and a wind power station 802 .

[0183] Specifically, the new energy station 80 can be a photovoltaic station 801 or a wind power station 802 that operates independently, or the photovoltaic station 801 and the wind power station 802 can be networked and operated simultaneously. The photovoltaic station 801 is mainly composed of a photovoltaic array, a photovoltaic grid-connected inverter, a step-up transformer, and an AC switch cabinet. The photovoltaic array can directly convert solar radiation into DC power. Multiple photovoltaic arrays are arranged to form a photovoltaic array. The photovoltaic grid-connected inverter converts the photovoltaic array into a high-frequency three-phase voltage, which is then stepped up by a step-up transformer and sent to an AC switch cabinet. The wind power station 802 is composed of a wind turbine, a wind power converter, a step-up transformer, and an AC switch cabinet. The wind turbine includes a DC wind turbine and an AC wind turbine. The DC wind turbine can convert wind energy into DC power, and the wind power converter matched therewith can convert the DC power of the wind turbine into AC power that matches the power grid; the AC wind turbine can convert wind energy into AC power, and the wind power converter matched therewith can convert the AC power of the wind turbine into AC power that matches the power grid; then it is stepped up by a step-up transformer and sent to an AC switch cabinet. The new energy station 80 composed of the photovoltaic station 801 and the wind power station 802 provides an AC voltage to the electrolytic rectifier power supply, and the electrolytic rectifier power supply works.

[0184] Continue to refer Figure 8 , Optionally, the electrolysis station 804 also includes an AC switch cabinet and a transformer connected in series between the new energy station 80 and the electrolysis rectifier power supply;

[0185] The voltage amplitude is the voltage amplitude of the AC voltage at the input end of the AC switch cabinet, or the voltage amplitude of the AC voltage on the primary side of the transformer, or the voltage amplitude on the secondary side of the transformer.

[0186] Based on the above embodiments, the electrolysis station 804 is optionally composed of an AC switch cabinet, a step-down transformer, an electrolysis rectifier power supply, and an electrolytic cell. The new energy station 80 transmits the electric energy of the established AC network to the AC switch cabinet of the electrolysis station 804, and then reaches the electrolysis rectifier power supply after being stepped down by the step-down transformer, thereby controlling the operation of the electrolytic cell.

[0187] The voltage amplitude can be the voltage amplitude of the AC voltage at the input end of the AC switch cabinet, that is, the output voltage amplitude of the new energy station; it can also be the AC voltage amplitude on the primary side of the transformer, that is, the output voltage amplitude of the AC switch cabinet of the electrolysis station; it can also be the voltage amplitude on the secondary side of the transformer, that is, the voltage amplitude after voltage reduction. It can be seen that the embodiment of the present invention can collect voltage amplitudes locally at the electrolysis station, without the need to transmit information collected by the photovoltaic station and the wind power station to the electrolysis station through network communication or the like. Therefore, the embodiment of the present invention is conducive to avoiding the problem of untimely adjustment caused by communication delays, and is also conducive to reducing communication costs.

[0188] Fig. 9 is a schematic diagram of the structure of another AC electrolysis system provided by an embodiment of the present invention, referring to Fig. 9 The AC electrolysis system is a grid-connected electrolysis system, which is supported by the AC power grid, and can be connected to new energy sources such as photovoltaics and wind power in the AC grid, and can also be connected to energy storage devices such as energy storage. Photovoltaic station 801, wind power station 802, AC group station 803 and AC power grid are connected to the grid for operation. The AC electrolysis system is supported by the power grid, which is conducive to achieving stable grid voltage and grid frequency. The electrolysis power supply can be fixed power electrolysis, and can also be variable power electrolysis following the power fluctuation of new energy.

[0189] It should be noted that the AC group station 803 is mainly composed of energy storage batteries, energy storage PCS, step-up transformer and AC switch cabinet. The energy storage PCS can control the charging and discharging process of the energy storage battery, perform AC-DC conversion, and directly supply power to the AC load when there is no power grid.

[0190] Fig.10 is a structural diagram of another AC electrolysis system provided by an embodiment of the present invention, referring to Fig.10 The AC electrolysis system is a microgrid electrolysis system, which is mainly composed of a photovoltaic station 801, a wind power station 802 and an AC group station 803. With photovoltaic as the new energy input, energy storage batteries as the energy storage energy, the energy storage PCS works to form an AC grid; the photovoltaic grid-connected inverter and wind power converter work to generate electricity and connect to the grid; the electrolysis rectifier power supply works. The electrolysis rectifier power supply usually changes power electrolysis with the power fluctuations of new energy sources such as photovoltaics and wind power, and in this process, the energy storage device plays a role in stabilizing the voltage and frequency of the grid and shaving the peak and filling the valley of power.

[0191] To sum up, the AC electrolysis system control method provided by the embodiment of the present invention has a wide range of applications. It is not only applicable to AC microgrid systems and AC grid-connected systems with smaller AC network fluctuations, but also applicable to AC network systems with larger AC network fluctuations. When large power fluctuations occur in the AC network, the embodiment of the present invention can timely control the electrolysis rectifier power supply, thereby solving the grid oscillation problem caused by power imbalance in the AC electrolysis system, thereby facilitating the normal operation of the electrolysis station.

[0192] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A control method for an AC electrolysis system, characterized in that: include: Obtaining the voltage amplitude of the AC side of the electrolytic rectifier power supply; According to the voltage amplitude, adjusting the output parameters of the electrolytic rectifier power supply; Obtaining the execution instruction of the electrolytic rectifier power supply and the actual instruction of the previous beat; The method for adjusting the output parameters includes: Setting a first threshold and a second threshold, wherein the first threshold is greater than the second threshold; If the voltage amplitude is greater than or equal to the first threshold, the execution instruction is used to control the output parameter of the electrolytic rectifier power supply; If the voltage amplitude is between the first threshold value and the second threshold value, the actual instruction of the previous beat is used to control the output parameter of the electrolytic rectifier power supply; If the voltage amplitude is less than the second threshold, the output parameter of the electrolytic rectifier power supply is controlled to be less than the previous beat.

2. The control method of the AC electrolysis system according to claim 1, characterized in that: The method for adjusting the output parameters includes: Calculate a matching execution instruction value according to the voltage amplitude; The execution instruction value is used to control the output parameter of the electrolytic rectifier power supply.

3. The control method of the AC electrolysis system according to claim 2, characterized in that: The voltage amplitude and the execution instruction value form a monotonically non-decreasing function; Substituting the voltage amplitude into the monotonically non-decreasing function, the execution instruction value is calculated.

4. The control method of the AC electrolysis system according to claim 3, characterized in that: The coefficients in the monotonically non-decreasing function are determined by the rated value of the voltage amplitude and the rated value of the output parameter.

5. The control method of the AC electrolysis system according to claim 1, characterized in that: The output parameter includes at least one of output power, output voltage and output current.

6. The control method of the AC electrolysis system according to claim 1, characterized in that: The method for obtaining the voltage amplitude includes: Detecting the three-phase instantaneous voltage value on the AC side of the electrolytic rectifier power supply; The voltage amplitude is calculated according to the three-phase instantaneous voltage values.

7. A control method for an AC electrolysis system, characterized in that: include: Obtaining the voltage amplitude of the AC side of the electrolytic rectifier power supply; According to the voltage amplitude, adjusting the output parameters of the electrolytic rectifier power supply; Obtaining an execution instruction of the electrolytic rectifier power supply; The method for adjusting the output parameters includes: Setting a first threshold; If the voltage amplitude is greater than or equal to the first threshold, the execution instruction is used to control the output parameter of the electrolytic rectifier power supply; If the voltage amplitude is less than the first threshold, the output parameter of the electrolytic rectifier power supply is controlled to be less than the previous beat.

8. The control method of the AC electrolysis system according to claim 1 or 7, characterized in that: The method for controlling the output parameter of the electrolytic rectifier power supply to be less than the previous beat includes: Taking the actual instruction of the previous beat as a reference, adjusting the execution instruction to control the output parameter of the electrolytic rectifier power supply to be less than the previous beat; And / or, by adjusting the duty cycle of the PWM signal received by the electrolytic rectifier power supply, the output parameter of the electrolytic rectifier power supply is controlled to be smaller than the previous beat; wherein the actual instruction of the previous beat and the execution instruction are converted into the PWM signal to control the electrolytic rectifier power supply.

9. The control method of the AC electrolysis system according to claim 8, characterized in that: If the execution instruction and the duty cycle of the PWM signal are adjusted simultaneously, the instruction with the smaller output parameter for controlling the electrolytic rectifier power supply shall prevail.

10. The control method of the AC electrolysis system according to claim 8, characterized in that: The method for determining the duty cycle of the PWM signal includes: If the electrolytic rectifier power supply is a voltage source type, and when the duty cycle of the PWM signal remains unchanged, the voltage amplitude and the voltage output by the electrolytic rectifier power supply form a first monotonically non-decreasing function; then the duty cycle of the PWM signal and the voltage amplitude form a first monotonically non-increasing function; the voltage amplitude is substituted into the first monotonically non-increasing function to calculate the duty cycle of the PWM signal; If the electrolytic rectifier power supply is a voltage source type, and when the duty cycle of the PWM signal remains unchanged, the voltage amplitude and the voltage output by the electrolytic rectifier power supply form a second monotonically non-increasing function; then the duty cycle of the PWM signal and the voltage amplitude form a second monotonically non-decreasing function; the voltage amplitude is substituted into the second monotonically non-decreasing function to calculate the duty cycle of the PWM signal; If the electrolytic rectifier power supply is a current source type, and when the duty cycle of the PWM signal remains unchanged, the voltage amplitude and the current output by the electrolytic rectifier power supply form a third monotonically non-decreasing function, then the duty cycle of the PWM signal and the voltage amplitude form a third monotonically non-increasing function; the voltage amplitude is substituted into the third monotonically non-increasing function to calculate the duty cycle of the PWM signal; If the electrolytic rectifier power supply is a current source type, and when the duty cycle of the PWM signal remains unchanged, the voltage amplitude and the current output by the electrolytic rectifier power supply constitute a fourth monotonically non-increasing function, then the duty cycle of the PWM signal and the voltage amplitude constitute a fourth monotonically non-decreasing function; the voltage amplitude is substituted into the fourth monotonically non-decreasing function to calculate the duty cycle of the PWM signal.

11. A control method for an AC electrolysis system, characterized in that: include: Obtaining the voltage amplitude of the AC side of the electrolytic rectifier power supply; According to the voltage amplitude, adjusting the output parameters of the electrolytic rectifier power supply; Obtaining an execution instruction of the electrolytic rectifier power supply; The method for adjusting the output parameters includes: Calculating an upper limit value of the output parameter according to the voltage amplitude; If the output parameter corresponding to the execution instruction is greater than the upper limit value of the output parameter, then controlling the electrolytic rectifier power supply to output the upper limit value of the output parameter; If the output parameter corresponding to the execution instruction is less than or equal to the upper limit value of the output parameter, the execution instruction is used to control the output parameter of the electrolytic rectifier power supply.

12. The control method of the AC electrolysis system according to claim 11, characterized in that: The voltage amplitude and the upper limit value of the output parameter form a monotonically non-decreasing function; Substitute the voltage amplitude into the monotonically non-decreasing function to calculate the output parameter upper limit value.

13. A control device for an AC electrolysis system, characterized in that: include: A voltage amplitude acquisition module is used to acquire the voltage amplitude of the AC side of the electrolytic rectifier power supply; An output parameter adjustment module, used to adjust the output parameters of the electrolytic rectifier power supply according to the voltage amplitude; The instruction acquisition module is used to acquire the execution instruction of the electrolytic rectifier power supply and the actual instruction of the previous beat; the output parameter adjustment module is also used to: Setting a first threshold and a second threshold, wherein the first threshold is greater than the second threshold; If the voltage amplitude is greater than or equal to the first threshold, the execution instruction is used to control the output parameter of the electrolytic rectifier power supply; If the voltage amplitude is between the first threshold value and the second threshold value, the actual instruction of the previous beat is used to control the output parameter of the electrolytic rectifier power supply; If the voltage amplitude is less than the second threshold, the output parameter of the electrolytic rectifier power supply is controlled to be less than the previous beat.

14. An AC electrolysis system, characterized in that: include: New energy station; An electrolysis station, comprising an electrolytic cell, an electrolysis rectifier power supply and a controller, wherein the electrolysis rectifier power supply is connected between the new energy station and the electrolytic cell, and the controller executes the control method as described in any one of claims 1-12.

15. The AC electrolysis system according to claim 14, characterized in that: The new energy station includes: at least one of a photovoltaic station and a wind power station.

16. The AC electrolysis system according to claim 14, characterized in that: The electrolysis station also includes an AC switch cabinet and a transformer connected in series between the new energy station and the electrolysis rectifier power supply; The voltage amplitude is the voltage amplitude of the AC voltage at the input end of the AC switch cabinet, or the voltage amplitude of the AC voltage on the primary side of the transformer, or the voltage amplitude on the secondary side of the transformer.

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