Electrolytic cell group staggered peak and valley switching method based on abandoned wind section identification

Abstract

This invention discloses a method for staggered power switching of an electrolytic cell group based on wind curtailment segment identification, comprising: generating a wind curtailment segment index by means of the power difference relationship between wind power output, grid-limited power, and the current absorbed power of the high-voltage alkaline electrolytic cell group; reflecting the power change amplitude and rate of change of each wind curtailment segment by means of a wind curtailment segment slope index; incorporating the current load, load increase rate, load decrease rate, load margin, cell pressure status, and cell temperature status into the same switching judgment basis by means of a high-voltage alkaline electrolytic cell load increase / decrease matrix, avoiding switching based solely on capacity or number; generating a staggered power switching sequence by means of candidate input groups, candidate maintenance groups, and candidate exit groups, combined with grid connection point operation constraints and cell boundaries, reducing power jumps and cell fluctuations caused by concentrated switching; and rearranging the subsequent switching sequence according to actual load changes and protection status, thereby improving the stability of wind curtailment absorption, the operational safety of the electrolytic cell group, and the continuity of switching control.

Description

Technical Field

[0001] This invention relates to the technical field of new energy grid connection and consumption and load scheduling for hydrogen production via water electrolysis, and particularly to a method for staggered peak switching of electrolyzer groups based on wind curtailment section identification. Background Technology

[0002] With the continuous increase in wind power installed capacity, some regions are prone to situations where wind power output cannot be fully connected to the grid for consumption when wind power generation is high, electricity load is low, or transmission channels are limited. Connecting the limited wind power to the water electrolysis hydrogen production system is a common technical approach to improve the local consumption capacity of wind power. Among them, high-pressure alkaline electrolyzers have the characteristics of large single-cell power, mature engineering application, and suitability for centralized hydrogen production station operation, and can participate in wind power consumption as an adjustable load. However, in actual operation, the difference between wind power output and grid-limited power is not always stable, but changes continuously with wind speed, dispatching restrictions, and station load status. If the number of electrolyzers put into operation is determined only based on the remaining power at a certain moment, multiple high-pressure alkaline electrolyzer units may be concentrated in a short period of time to increase or decrease load, causing sudden changes in grid connection power. At the same time, high-pressure alkaline electrolyzers are also subject to the limitations of cell pressure, cell temperature, and load adjustment rate during the increase and decrease of load. Too fast or frequent switching will increase the fluctuation of cell operation. Therefore, in the wind power hydrogen production scenario, how to rationally arrange the order of input, maintenance and withdrawal of electrolyzer groups according to the change process of wind curtailment power is a technical problem that needs further improvement.

[0003] CN116231690A discloses a hydrogen production system and method utilizing curtailed wind and solar power. This method acquires historical surplus power output data from renewable energy systems, sorts the data, removes outliers, and divides it into power tiers to determine the electrolyzer configuration. This method can match curtailed wind and solar power with electrolyzer capacity from a system configuration perspective, making it suitable for capacity design and power tier configuration of renewable energy hydrogen production systems. However, this method primarily determines the electrolyzer configuration based on historical surplus power and does not segment the real-time curtailment process (curtailment increase, curtailment stabilization, and curtailment decrease), nor does it match the power change amplitude and location of the curtailment segment with the load increase rate, load decrease rate, and load margin of the electrolyzer units. Therefore, when curtailed wind power increases or decreases rapidly, this method cannot directly provide a staggered switching sequence among multiple high-pressure alkaline electrolyzer units.

[0004] CN111463826A discloses a method and system for configuring and optimizing the control of alkaline electrolyzer arrays for wind power hydrogen production. This method determines the maximum power that the alkaline electrolyzer array needs to absorb based on historical wind turbine output power curves, and determines the configuration capacity and number of individual cells in the electrolyzer array based on the overload characteristics of the alkaline electrolyzer. During operation, the individual electrolyzer cells are divided into rated power operation, fluctuating power operation, overload power operation, and shutdown states, and their operating states are allocated according to a rotation system. This method considers the operational allocation problem of different cells in the alkaline electrolyzer array, which can reduce some power consumption. This method addresses the issue of high-load operation of electrolytic cells over extended periods. However, it primarily allocates operating status based on real-time turbine output power and rotation rules, failing to consider grid-limited power and the current power absorbed by the electrolytic cell group to determine the actual curtailment section. Furthermore, it does not differentiate between load increases, maintenance, and shutdown of electrolytic cell units based on the curtailment section slope. Simultaneously, this method does not incorporate grid connection voltage deviation, frequency deviation, transformer load rate, line power flow margin, and the cell voltage and temperature boundaries of the high-voltage alkaline electrolytic cells into the switching sequence, making it difficult to achieve stable peak-shaving control results when both grid-connection constraints and cell operation constraints coexist.

[0005] In summary, given that existing wind curtailment-to-hydrogen scheduling technologies still suffer from problems such as insufficient identification of curtailment sections, inadequate matching of switching sequence with the load-raising and lowering characteristics of electrolyzers, and insufficient integration of grid-side constraints and cell-side constraints, this invention is proposed. The problem this invention aims to solve is how to form a suitable staggered switching sequence for high-pressure alkaline electrolyzer groups under operating conditions where wind power output is limited and high-pressure alkaline electrolyzer groups participate in the absorption of power, based on the rising, stabilizing, and falling changes in wind curtailment power. Summary of the Invention

[0006] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this section, the abstract and title of the invention. Such simplifications or omissions shall not be used to limit the scope of the present invention.

[0007] In view of the aforementioned existing problems, the present invention is proposed.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: As a preferred embodiment of the method for staggered peak switching of electrolytic cell groups based on wind curtailment segment identification described in this invention, the wind curtailment segment index is generated by dividing the wind curtailment rising segment, wind curtailment stable segment, and wind curtailment falling segment according to the power difference relationship between wind power output, grid-limited power and current absorbed power of high-voltage alkaline electrolytic cell group. Based on the location and magnitude of power change in each wind curtailment section in the aforementioned wind curtailment section index, a wind curtailment section slope index is generated. Based on the current load, load increase rate, load decrease rate, available load increase margin, available load decrease margin, cell pressure status, and cell temperature status of each high-pressure alkaline electrolytic cell unit, a high-pressure alkaline electrolytic cell load increase / decrease matrix is ​​generated. The slope index of the wind curtailment section is matched with the load increase / decrease matrix of the high-pressure alkaline electrolyzer to generate candidate input groups, candidate maintenance groups, and candidate exit groups. Based on the grid connection point voltage deviation, frequency deviation, transformer load rate, line power flow margin, slot voltage boundary, and slot temperature boundary, the candidate input group, the candidate retention group, and the candidate exit group are screened and sorted to generate a staggered peak switching sequence. Based on the actual load changes, switching completion status, cell pressure protection status, and cell temperature protection status of each high-pressure alkaline electrolytic cell unit, the subsequent switching sequence in the staggered switching sequence is rearranged.

[0009] The beneficial effects of this invention are as follows: This invention utilizes the power difference relationship between wind power output, grid-connected restricted power, and the current absorbed power of the high-voltage alkaline electrolyzer group to divide the wind curtailment into three stages: rising, stable, and falling. This transforms the wind curtailment power from a single surplus power into a scheduling object with changing phases. Through the wind curtailment segment slope index, it further reflects the power change amplitude and rate of change in each segment, providing a matching basis for the electrolyzer group's load increase, maintenance, and decrease. Through the high-voltage alkaline electrolyzer load increase / decrease matrix, it integrates the current load, load increase rate, load decrease rate, and load... The remaining capacity, cell pressure status, and cell temperature status are incorporated into the same switching decision basis to avoid switching based solely on capacity or number. By generating candidate input groups, candidate maintenance groups, and candidate exit groups, the electrolytic cell group forms a grouping and succession relationship during the rise, stabilization, and fall of wind curtailment. Furthermore, by combining grid connection point operation constraints and cell boundaries, a staggered switching sequence is generated to reduce power jumps and cell fluctuations caused by concentrated switching. Finally, the subsequent switching sequence is rearranged based on actual load changes and protection status, thereby improving the stability of wind curtailment absorption, the operational safety of the electrolytic cell group, and the continuity of switching control. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic flowchart of the electrolytic cell cluster staggered switching method based on wind curtailment section identification as shown in this invention. Detailed Implementation

[0011] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following provides a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them.

[0012] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0013] In the following description, many specific details are set forth to facilitate a thorough understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0014] This embodiment provides a method for staggered switching of an electrolyzer group based on curtailment segment identification, which is adapted to the scenarios of curtailment consumption and staggered switching control of an electrolyzer group in a high-voltage alkaline water electrolysis hydrogen production station supporting a wind power base under grid connection constraints. The wind power base includes wind turbines, substation collection lines, booster stations, grid connection point measurement and control devices, and station-level energy management devices. The high-voltage alkaline water electrolysis hydrogen production station includes a high-voltage alkaline electrolyzer group, a rectifier transformer, a controllable rectifier cabinet, an alkali liquid circulation device, a gas-liquid separation device, a cooling and heat exchange device, a cell voltage measurement device, a cell temperature measurement device, a high-voltage alkaline electrolyzer unit control cabinet, and a station-level energy management device. The high-voltage alkaline electrolyzer group includes multiple high-voltage alkaline electrolyzer units. In this embodiment, the number of high-voltage alkaline electrolyzer units is 6, numbered E01, E02, E03, E04, E05, and E06 respectively. The rated DC power of a single cell is 5 MW, and the stable operating load range is 1 MW to 5 MW.

[0015] According to the embodiments of the present invention, in combination with Figure 1 the flowchart shown, a method for staggered switching of an electrolyzer group based on curtailment segment identification specifically includes the following steps: S1. Based on the power difference relationship among wind power output, grid connection constraint power, and the current absorbed power of the high-voltage alkaline electrolyzer group, divide the curtailment rising segment, curtailment stable segment, and curtailment falling segment, and generate a curtailment segment index. Here, it should be noted in this step that: S1.1. Arrange the wind power output, grid connection constraint power, and the current absorbed power of the high-voltage alkaline electrolyzer group at the same sampling moment to obtain a wind power output sequence, a grid connection constraint power sequence, and a current absorbed power sequence.

[0016] In this embodiment, the wind power output is obtained from the active power measurement device at the grid connection point of the wind power base substation, specifically the active power that the wind power base can send to the grid connection point at the current sampling time; the grid-limited power is obtained from the active power limit value issued by the grid-connected dispatch automation system to the station-level energy management device of the wind power base, specifically the upper limit of active power that the grid connection point is allowed to send to the grid at the current sampling time; the current absorbed power of the high-voltage alkaline electrolyzer group is obtained by summing the DC power of the controllable rectifier cabinet of each high-voltage alkaline electrolyzer unit, and the DC power is converted from the DC voltage measurement value and DC current measurement value of the controllable rectifier cabinet; when the active power on the low-voltage side of the rectifier transformer is used as the dispatch basis of the station-level energy management device, the current absorbed power of the high-voltage alkaline electrolyzer group is obtained by summing the active power measurement values ​​on the low-voltage side of each rectifier transformer and deducting the station load unrelated to the electrolyzer group.

[0017] It should be noted that the sampling time uses Beijing time in whole minutes, and the sampling interval is 60 seconds; for example, the sampling times are 10:00:00, 10:01:00, 10:02:00, 10:03:00, 10:04:00, 10:05:00, 10:06:00, 10:07:00, 10:08:00 and 10:09:00 respectively.

[0018] The wind power output sequence is a one-dimensional ordered sequence with the sampling time as the sequential index and the wind power output value as the sequence value; the grid-connected restricted power sequence is a one-dimensional ordered sequence with the sampling time as the sequential index and the grid-connected restricted power value as the sequence value; the current absorbed power sequence is a one-dimensional ordered sequence with the sampling time as the sequential index and the current absorbed power value of the high-voltage alkaline electrolyzer group as the sequence value; each sampling time corresponds to one wind power output value, one grid-connected restricted power value, and one current absorbed power value of the high-voltage alkaline electrolyzer group; if any one of the above values ​​is missing at any sampling time, that sampling time will not be included in the identification of the wind curtailment section in this round.

[0019] For example, the wind power output sequence from 10:00:00 to 10:09:00 can be 148MW, 154MW, 158MW, 162MW, 164MW, 164MW, 163MW, 160MW, 156MW and 149MW respectively; the grid-limited power sequence can all be 150MW; and the current absorption power sequence can all be 3MW.

[0020] S1.2 Subtract the wind power output sequence from the grid-limited power sequence one by one to obtain the grid-limited difference sequence; subtract the grid-limited difference sequence from the current absorbed power sequence one by one to obtain the absorbed remaining difference sequence; the grid-limited difference sequence and the absorbed remaining difference sequence form the power difference relationship.

[0021] For example, the calculation relationship is as follows: in, The sampling time is the sequential number in the wind power output sequence, the grid-connected confined power sequence, and the current absorbed power sequence; The value of is an integer from 1 to n; n is the total number of sampling times for the wind power output sequence, the grid-connected limited power sequence, and the current absorbed power sequence; For the first Wind power output at each sampling time; For the first Grid-limited power at each sampling time; For the first The current absorbed power of the high-voltage alkaline electrolytic cell group at each sampling time; For the first The difference in grid-connected constraints at each sampling time; For the first The remaining difference absorbed at each sampling time; For the first The relationship between power differences at each sampling time.

[0022] It should be noted that the grid-connected curtailment difference sequence reflects the power difference between wind power output and grid-connected curtailment power; the remaining absorption difference sequence reflects the remaining curtailed wind power that still needs to be absorbed after deducting the current absorption power of the high-voltage alkaline electrolyzer group.

[0023] Preferably, the power difference relationship is formed by arranging the grid-limited difference and the remaining absorption difference at each sampling time according to the sampling time. Specifically, it includes the power space where the wind power output exceeds the grid-limited power at each sampling time, and the remaining wind curtailment power space after deducting the current absorption power of the high-voltage alkaline electrolyzer group.

[0024] For example, at the sampling time 10:03:00, the wind power output is 162MW, the grid-limited power is 150MW, and the current absorption power of the high-voltage alkaline electrolytic cell group is 3MW. Then the grid-limited difference is 12MW, the remaining absorption difference is 9MW, and the power difference relationship is a correspondence between 12MW and 9MW.

[0025] S1.3 In the absorption of the remaining difference sequence, the position that changes from less than or equal to zero to greater than zero is taken as the starting position of wind curtailment, and the position that changes from greater than zero to less than or equal to zero is taken as the ending position of wind curtailment. The interval between the starting position of wind curtailment and the ending position of wind curtailment is taken as the candidate interval of wind curtailment.

[0026] In this embodiment, the residual difference sequence is checked from earliest to latest according to the sampling time. When the residual difference at a certain sampling time is greater than 0 and the residual difference at the previous sampling time is not higher than 0, the sampling time is taken as the starting position of wind curtailment. When the residual difference at a certain sampling time is greater than 0 and the residual difference at the next sampling time is not higher than 0, the sampling time is taken as the ending position of wind curtailment. If the starting sampling time of the residual difference sequence is already greater than 0, the starting sampling time of the residual difference sequence is taken as the starting position of wind curtailment. If the ending sampling time of the residual difference sequence is still greater than 0, the ending sampling time of the residual difference sequence is taken as the ending position of wind curtailment.

[0027] Furthermore, the candidate interval for wind curtailment consists of all sampling times from the start position to the end position of wind curtailment and their corresponding residual absorption difference; for example, if the sequence of residual absorption difference is -5MW, 1MW, 5MW, 9MW, 11MW, 11MW, 10MW, 7MW, 3MW and -4MW, then 10:01:00 is the start position of wind curtailment, 10:08:00 is the end position of wind curtailment, and 10:01:00 to 10:08:00 is the candidate interval for wind curtailment.

[0028] S1.4 Within the candidate interval for wind curtailment, the intervals for increasing, maintaining, and decreasing values ​​of the remaining difference sequence are divided into the rising, stable, and falling segments of wind curtailment, and the wind curtailment segment index is generated according to the order of the starting position, rising segment, stable segment, falling segment, and ending position of wind curtailment.

[0029] In this embodiment, within the candidate interval for wind curtailment, the interval of increasing value refers to the interval in which the remaining difference in absorption of the next sampled time is greater than the remaining difference in absorption of the previous sampled time, and this increasing relationship occurs continuously along the sampling time; the interval of maintaining value refers to the interval in which the change in the remaining difference in absorption of the next sampled time is not higher than the minimum load adjustment step of a single trough, and does not show a continuous increase or a continuous decrease; the interval of decreasing value refers to the interval in which the remaining difference in absorption of the next sampled time is less than the remaining difference in absorption of the previous sampled time, and this decreasing relationship occurs continuously along the sampling time.

[0030] Preferably, the minimum load adjustment step size for a single tank is 0.25MW in this embodiment.

[0031] Specifically, starting from the initial position of wind curtailment, the changing trend of the remaining absorption difference is examined from early to late along the sampling time. A continuously increasing interval is classified as the rising wind curtailment segment. When the change in adjacent remaining absorption differences falls within the range not exceeding the minimum load adjustment step of a single trough, the interval is classified as the stable wind curtailment segment. When the remaining absorption difference changes from the stable wind curtailment segment to a continuously decreasing segment, the subsequent continuously decreasing interval is classified as the falling wind curtailment segment. If there is no continuous value holding interval within the candidate wind curtailment interval, the sampling time containing the maximum remaining absorption difference is classified as the stable wind curtailment segment, the interval before that sampling time is classified as the rising wind curtailment segment, and the interval after that sampling time is classified as the falling wind curtailment segment.

[0032] For example, the remaining absorption difference within the candidate wind curtailment interval is arranged according to the sampling time as 1MW, 4MW, 7MW, 7.1MW, 7.0MW, 6.9MW, 5MW, and 2MW. Among them, 1MW, 4MW, and 7MW constitute the rising wind curtailment segment, 7.1MW, 7.0MW, and 6.9MW constitute the stable wind curtailment segment, and 5MW and 2MW constitute the falling wind curtailment segment. Subsequently, a wind curtailment segment index is generated according to the arrangement order of the wind curtailment start position, rising wind curtailment segment, stable wind curtailment segment, falling wind curtailment segment, and ending wind curtailment position. The wind curtailment segment index includes the wind curtailment start position, the first and last sampling times of the rising wind curtailment segment, the first and last sampling times of the stable wind curtailment segment, the first and last sampling times of the falling wind curtailment segment, the ending wind curtailment position, and the remaining absorption difference corresponding to each sampling time.

[0033] It should be noted that step S1 can break down the continuous wind curtailment process under grid-limited conditions into three stages: power increase, power stable fluctuation, and power decrease. This solves the technical problem that it is impossible to distinguish between the rising process, the stable fluctuation process, and the falling process when switching electrolyzer groups based solely on instantaneous wind curtailment power. As a result, it provides clear time and power boundaries for subsequent load increase matching, stable phase small-scale adjustment matching, and load decrease matching, thereby reducing the probability of frequent switching of electrolyzer groups and improving the matching degree between the wind curtailment power absorption process and the grid-limited change process.

[0034] S2. Generate a wind curtailment slope index based on the location and magnitude of power changes in each wind curtailment segment in the wind curtailment segment index. Note that the following should be noted in this step: S2.1. Based on the wind curtailment section index, extract the absorption residual difference sequence in the wind curtailment rising section, wind curtailment stable section and wind curtailment falling section respectively, and obtain the first absorption residual difference and the last absorption residual difference in each wind curtailment section respectively.

[0035] In this embodiment, the wind curtailment segment index already includes the first and last sampling times of the wind curtailment rise segment, wind curtailment stability segment, and wind curtailment fall segment. When extracting the absorption residual difference sequence within the wind curtailment rise segment, all absorption residual differences between the first and last sampling times of the wind curtailment rise segment are extracted from the absorption residual difference sequence and arranged in order of sampling time from earliest to latest. When extracting the absorption residual difference sequence within the wind curtailment stability segment, all absorption residual differences between the first and last sampling times of the wind curtailment stability segment are extracted from the absorption residual difference sequence and arranged in order of sampling time from earliest to latest. When extracting the absorption residual difference sequence within the wind curtailment fall segment, all absorption residual differences between the first and last sampling times of the wind curtailment fall segment are extracted from the absorption residual difference sequence and arranged in order of sampling time from earliest to latest.

[0036] The first absorption residual difference in each wind curtailment segment is the absorption residual difference at the first sampling time of the corresponding wind curtailment segment; the last absorption residual difference in each wind curtailment segment is the absorption residual difference at the last sampling time of the corresponding wind curtailment segment; wherein, when a wind curtailment segment contains only 1 sampling time, the absorption residual difference corresponding to that sampling time is used as both the first absorption residual difference and the last absorption residual difference of that wind curtailment segment.

[0037] For example, the residual absorption difference sequence during the rising phase of wind curtailment is 1MW, 4MW, and 7MW, with the first residual absorption difference being 1MW and the last being 7MW; the residual absorption difference sequence during the stable phase of wind curtailment is 7.1MW, 7.0MW, and 6.9MW, with the first residual absorption difference being 7.1MW and the last being 6.9MW; and the residual absorption difference sequence during the falling phase of wind curtailment is 5MW and 2MW, with the first residual absorption difference being 5MW and the last being 2MW.

[0038] S2.2 The difference between the last remaining absorption difference and the first remaining absorption difference in the wind curtailment rising stage is taken as the power change amplitude in the wind curtailment rising stage, and the difference between the first remaining absorption difference and the last remaining absorption difference in the wind curtailment falling stage is taken as the power change amplitude in the wind curtailment falling stage.

[0039] S2.3 The ratio of the power change amplitude of the wind curtailment rising phase to the duration of the wind curtailment rising phase is taken as the wind curtailment rising slope, and the ratio of the power change amplitude of the wind curtailment falling phase to the duration of the wind curtailment falling phase is taken as the wind curtailment falling slope.

[0040] Specifically, the duration of the wind curtailment rise phase is the time interval between the last sampling time and the first sampling time of the wind curtailment rise phase; the duration of the wind curtailment fall phase is the time interval between the last sampling time and the first sampling time of the wind curtailment fall phase; when the sampling interval is 60s, if the wind curtailment rise phase includes 10:01:00, 10:02:00 and 10:03:00, then the duration of the wind curtailment rise phase is 120s; if the wind curtailment fall phase includes 10:07:00 and 10:08:00, then the duration of the wind curtailment fall phase is 60s; where, when a certain wind curtailment phase contains only 1 sampling time, the duration of that wind curtailment phase is counted as 60s.

[0041] For example, if the power change during the rising phase of wind curtailment is 6MW and the duration is 120s, then the rising slope of wind curtailment is 3MW / min; if the power change during the falling phase of wind curtailment is 3MW and the duration is 60s, then the falling slope of wind curtailment is 3MW / min.

[0042] S2.4. Based on the variation of the difference in the remaining absorption between adjacent wind curtailment sections, generate the wind curtailment stability fluctuation amount, and generate the wind curtailment section slope index in the order of wind curtailment rise slope, wind curtailment stability fluctuation amount, and wind curtailment fall slope.

[0043] Specifically, the generation of wind curtailment stability fluctuations includes: According to the order of the remaining absorption differences within the stable wind curtailment period, the adjacent remaining absorption differences are subtracted one by one to obtain the adjacent change values ​​of the stable period; the positive, negative and zero values ​​of the adjacent change values ​​of the stable period are arranged in the order of appearance to generate the change sequence of the stable period; the fluctuation level of the stable period is generated according to the number of alternations of positive and negative values, the number of consecutive positive values ​​and the number of consecutive negative values ​​in the change sequence of the stable period; the maximum absolute value of the adjacent change values ​​of the stable period is taken as the maximum adjacent change value of the stable period, and the stable fluctuation amount of wind curtailment is composed of the stable period fluctuation level and the maximum adjacent change value of the stable period.

[0044] Preferably, the fluctuation levels during the stable period include stable level one, stable level two, stable level three, and stable level four, wherein: When all adjacent changes in the stable segment of the change sequence are zero, the stable segment of wind curtailment is marked as stable level one; When adjacent changes in the stable segment of the change sequence include positive or negative values, and the positive and negative values ​​do not alternate, the stable segment of wind curtailment is marked as stable level two. When the adjacent change values ​​of the stable segment in the stable segment change sequence include alternating positive and negative values, and the absolute value of each adjacent change value of the stable segment is less than or equal to the minimum load adjustment step size of a single trough, the stable segment of wind curtailment is marked as stable level three. When there is an adjacent change value in the stable segment change sequence whose absolute value is greater than the minimum load adjustment step size of a single trough, the stable segment of wind curtailment is marked as stable level four.

[0045] It should be noted that the minimum load adjustment step size for a single cell refers to the minimum DC power increase or decrease that the controllable rectifier cabinet can execute under normal electrolysis conditions. The minimum load adjustment step size for a single cell is jointly determined by the minimum DC power adjustment capability in the technical agreement of the high-voltage alkaline electrolytic cell unit manufacturer, the power adjustment resolution of the controllable rectifier cabinet, and the station-level commissioning and acceptance curve. In this embodiment, the rated DC power of a single cell is 5MW, and the minimum stable adjustment ratio of the controllable rectifier cabinet is 5%, so the minimum load adjustment step size for a single cell is 0.25MW.

[0046] Furthermore, the maximum absolute value of adjacent changes in the stable segment is taken as the maximum adjacent change value of the stable segment. The fluctuation level of the stable segment and the maximum adjacent change value of the stable segment together constitute the stable fluctuation amount of wind curtailment. For example, when the absorption surplus difference in the stable segment of wind curtailment is 7.1MW, 7.0MW and 6.9MW, the adjacent changes in the stable segment are -0.1MW and -0.1MW, positive and negative values ​​do not alternate, and the maximum absolute value is 0.1MW. Then the stable fluctuation amount of wind curtailment consists of stable level 2 and 0.1MW.

[0047] For example, if the adjacent change values ​​of the stable section are 0.12MW, -0.10MW, and 0.08MW, and the minimum load adjustment step of a single trough is 0.25MW, then the stable section of wind curtailment is marked as stable level 3; if 0.40MW appears in the adjacent change values ​​of the stable section, then the stable section of wind curtailment is marked as stable level 4.

[0048] Preferably, step S2 converts the time position and power change in the curtailment section index into a curtailment section slope index that can be compared with the load-raising capacity, load-lowering capacity, and small-amplitude adjustment capacity of the high-pressure alkaline electrolyzer unit. This solves the technical problem that the curtailment power change process is difficult to directly correspond to the load-raising and lowering capacity of the electrolyzer group. It also provides clear criteria for the formation of subsequent candidate input groups, candidate maintenance groups, and candidate exit groups based on the power change amplitude, duration, and fluctuation level, thereby reducing disordered input / output caused by curtailment power fluctuations.

[0049] S3. Based on the current load, load increase rate, load decrease rate, available load increase margin, available load decrease margin, cell pressure status, and cell temperature status of each high-pressure alkaline electrolytic cell unit, generate a high-pressure alkaline electrolytic cell load increase / decrease matrix. Note that the following should be noted in this step: S3.1 Use the high-pressure alkaline electrolytic cell unit number as the row identifier, and the current load, load increase rate, load decrease rate, load increase margin, load decrease margin, cell pressure status, and cell temperature status as the column identifier.

[0050] Specifically, the high-pressure alkaline electrolyzer unit number is obtained from the hydrogen production station equipment ledger, the high-pressure alkaline electrolyzer unit control cabinet number, and the station-level energy management device equipment number. The high-pressure alkaline electrolyzer unit numbers specifically include E01, E02, E03, E04, E05, and E06. Each high-pressure alkaline electrolyzer unit number corresponds to one high-pressure alkaline electrolyzer unit, one set of controllable rectifier cabinet, and one set of high-pressure alkaline electrolyzer unit control cabinet.

[0051] Furthermore, the current load specifically refers to the DC power value of the high-voltage alkaline electrolyzer unit at the current sampling moment, obtained from the DC power measurement value of the controllable rectifier cabinet; the load increase rate specifically refers to the rate at which the DC power of the high-voltage alkaline electrolyzer unit can be increased when the cell voltage and cell temperature are within the normal operating range, determined jointly by the current allowable load increase value of the high-voltage alkaline electrolyzer unit control cabinet, the manufacturer's technical agreement, and the on-site commissioning curve; the load decrease rate specifically refers to the rate at which the DC power of the high-voltage alkaline electrolyzer unit can be decreased when the cell voltage and cell temperature are within the normal operating range, determined jointly by the current allowable load decrease value of the high-voltage alkaline electrolyzer unit control cabinet, the manufacturer's technical agreement, and the on-site commissioning curve; the load increase margin specifically refers to the power difference between the current load and the upper boundary of the stable operating load range for the high-voltage alkaline electrolyzer unit; the load decrease margin specifically refers to the power difference between the current load and the lower boundary of the stable operating load range for the high-voltage alkaline electrolyzer unit.

[0052] In this embodiment, the stable operating load range is 1MW to 5MW; the cell pressure status is specifically the average voltage of the small chamber or the converted value of the whole cell voltage of the high-pressure alkaline electrolytic cell unit, which is obtained by the cell pressure measuring device; the cell temperature status is specifically the alkaline solution outlet temperature or cell temperature of the high-pressure alkaline electrolytic cell unit, which is obtained by the cell temperature measuring device.

[0053] S3.2 Arrange the current load, load increase rate, load decrease rate, load increase margin, load decrease margin, cell pressure status and cell temperature status of the same high-pressure alkaline electrolytic cell unit according to column labels to form an electrolytic cell unit status row.

[0054] S3.3 Arrange the status rows of each electrolytic cell unit according to the row identifier to generate the load increase / decrease matrix of the high-pressure alkaline electrolytic cell.

[0055] As an example, the mathematical formula for the load change matrix of a high-pressure alkaline electrolyzer is as follows: in, For the lifting and lowering load matrix of high-pressure alkaline electrolytic cells; This refers to the number of high-pressure alkaline electrolytic cell units; For the first Each high-pressure alkaline electrolytic cell unit is numbered; This refers to the sequential numbering of the high-pressure alkaline electrolyzer unit within the high-pressure alkaline electrolyzer load change matrix; For the first Current load of each high-pressure alkaline electrolytic cell unit; For the first Loading rate of each high-pressure alkaline electrolytic cell unit; For the first The unloading rate of a high-pressure alkaline electrolytic cell unit; For the first The load capacity of each high-pressure alkaline electrolytic cell unit; For the first The load reduction margin for each high-pressure alkaline electrolytic cell unit; For the first The cell pressure status of each high-pressure alkaline electrolytic cell unit; For the first The temperature status of each high-pressure alkaline electrolytic cell unit.

[0056] For example, the load adjustment matrix of a high-pressure alkaline electrolyzer can be specifically represented as shown in the table below: Table 1. Operating Data of High-Pressure Alkaline Electrolyzer It should be noted that step S3 can organize the operating status of each high-pressure alkaline electrolyzer unit's control cabinet, controllable rectifier cabinet, cell pressure measuring device, and cell temperature measuring device into a unified high-pressure alkaline electrolyzer load increase / decrease matrix. This solves the technical problem of difficulty in synchronously comparing the load capacity, load increase / decrease capacity, and boundary state of a single cell in the electrolyzer group switching decision. It also enables the subsequent wind curtailment section slope index to be matched item by item with the adjustable capacity of each high-pressure alkaline electrolyzer unit, reducing the risk of switching mismatch caused by differences in the state of a single cell.

[0057] S4. Match the slope index of the wind curtailment section with the load increase / decrease matrix of the high-pressure alkaline electrolyzer to generate candidate input groups, candidate maintenance groups, and candidate exit groups. Note the following in this step: S4.1 Compare the curtailment slope in the curtailment slope index with the load increase rate in the high-pressure alkaline electrolyzer load increase matrix item by item. Arrange the high-pressure alkaline electrolyzer units with load increase rates greater than or equal to the curtailment slope in descending order of load increase margin. Then, classify the range of units with accumulated load increase margins greater than or equal to the power change range of the curtailment rising section into the candidate input group. S4.2. Compare the stable fluctuation of wind curtailment in the slope index of the curtailment section with the load increase margin and load decrease margin in the load increase / decrease matrix of the high-pressure alkaline electrolyzer, and compare the current load with the stable operating load range of the high-pressure alkaline electrolyzer unit, item by item; and classify the high-pressure alkaline electrolyzer units whose current load is within the stable operating load range, whose load increase margin is greater than or equal to the stable fluctuation of wind curtailment, and whose load decrease margin is greater than or equal to the stable fluctuation of wind curtailment into the candidate retention group; S4.3 Compare the curtailment slope in the curtailment section slope index with the load reduction rate in the high-pressure alkaline electrolyzer load increase / decrease matrix item by item. Arrange the high-pressure alkaline electrolyzer units with load reduction rates greater than or equal to the curtailment slope in descending order of load reduction margin. Then, classify the range of units with accumulated load reduction margins greater than or equal to the power change range of the curtailment section into the candidate exit group.

[0058] It should be noted that through step S4, high-pressure alkaline electrolyzer units with load-increasing capacity, small-scale adjustment capacity, and load-reducing capacity can be selected according to the wind curtailment rising section, wind curtailment stabilization section, and wind curtailment falling section, respectively. This solves the technical problem that the differences in the capacity of different single cells were not distinguished when the electrolyzer group was uniformly switched on. It also ensures that each stage of commissioning, maintaining, and withdrawing has a corresponding single cell set basis, reducing the possibility that high-pressure alkaline electrolyzer units without corresponding load-increasing and reducing capacity will enter the subsequent commissioning sequence.

[0059] S5. Based on the grid connection point voltage deviation, frequency deviation, transformer load rate, line power flow margin, slot voltage boundary, and slot temperature boundary, the candidate input group, candidate maintenance group, and candidate withdrawal group are screened and sorted to generate a staggered peak switching sequence. Note that the following should be noted in this step: In this embodiment, the grid connection point voltage deviation is obtained as a percentage by converting the difference between the measured grid connection point voltage obtained by the grid connection point monitoring and control device and the rated grid connection point voltage; when the rated grid connection point voltage is 220kV and the measured grid connection point voltage is 223.3kV, the grid connection point voltage deviation is 1.5%; the frequency deviation is obtained as the difference between the measured system frequency obtained by the grid connection point monitoring and control device and 50Hz; when the measured system frequency is 50.04Hz, the frequency deviation is 0.04Hz; the transformer load rate is obtained as the ratio between the current apparent power of the main transformer of the hydrogen production station and the rated capacity of the main transformer; when the rated capacity of the main transformer is 80MVA and the current apparent power is 52MVA, the transformer load rate is 65%; the line power flow margin is obtained by subtracting the current power flow from the allowable power flow limit of the hydrogen production station's incoming line or grid connection tie line; when the allowable power flow limit of the line is 60MW and the current power flow is 42MW, the line power flow margin is 18MW.

[0060] Furthermore, the cell voltage boundary is jointly determined by the technical agreement of the high-pressure alkaline electrolytic cell unit manufacturer, the on-site commissioning and acceptance curve, and the on-site safety operation procedures. In this embodiment, the lower boundary of the cell voltage is 1.75V, and the upper boundary of the cell voltage is 2.20V. The cell temperature boundary is jointly determined by the technical agreement of the high-pressure alkaline electrolytic cell unit manufacturer, the operating range of the alkali circulation system, and the operating capacity of the cooling heat exchange device. In this embodiment, the lower boundary of the cell temperature is 65°C, and the upper boundary of the cell temperature is 90°C. The grid-connected operation boundary includes the grid connection point voltage deviation operation boundary, the frequency deviation operation boundary, and the transformer load rate operation boundary. In this embodiment, the grid connection point voltage deviation operation boundary is 2.0%, the frequency deviation operation boundary is 0.10Hz, and the transformer load rate operation boundary is 85%.

[0061] S5.1 Compare the high-pressure alkaline electrolytic cell units in the candidate input group, candidate retention group, and candidate exit group with the cell pressure boundary and cell temperature boundary, respectively; retain the high-pressure alkaline electrolytic cell units whose cell pressure state is greater than or equal to the lower cell pressure boundary and less than or equal to the upper cell pressure boundary, and whose cell temperature state is greater than or equal to the lower cell temperature boundary and less than or equal to the upper cell temperature boundary, and form the boundary input group, boundary retention group, and boundary exit group, respectively.

[0062] Specifically, for each high-pressure alkaline electrolytic cell unit in the candidate input group, its cell pressure state is compared with the lower and upper cell pressure boundaries, and its cell temperature state is compared with the lower and upper cell temperature boundaries. When the cell pressure state is not lower than the lower cell pressure boundary and not higher than the upper cell pressure boundary, and the cell temperature state is not lower than the lower cell temperature boundary and not higher than the upper cell temperature boundary, the high-pressure alkaline electrolytic cell unit is retained in the boundary screening results corresponding to the candidate input group. After completing the comparison of all high-pressure alkaline electrolytic cell units in the candidate input group, the boundary screening results corresponding to the candidate input group form the boundary input group.

[0063] The cell pressure and temperature states of the candidate retention group and the candidate exit group are compared in the same way. The high-voltage alkaline electrolytic cell units in the candidate retention group that are compared in terms of cell pressure and temperature states form the boundary retention group. The high-voltage alkaline electrolytic cell units in the candidate exit group that are compared in terms of cell pressure and temperature states form the boundary exit group. If the cell pressure state of a certain high-voltage alkaline electrolytic cell unit is lower than the lower boundary of cell pressure or higher than the upper boundary of cell pressure, or the cell temperature state is lower than the lower boundary of cell temperature or higher than the upper boundary of cell temperature, then the high-voltage alkaline electrolytic cell unit will not enter the corresponding boundary group.

[0064] S5.2 Compare the voltage deviation, frequency deviation, and transformer load rate at the grid connection point with the corresponding grid connection operation boundary, and compare the line power flow margin with the load increment of the boundary input group; when the voltage deviation, frequency deviation, and transformer load rate at the grid connection point are all less than or equal to the corresponding grid connection operation boundary, and the line power flow margin is greater than or equal to the load increment of the boundary input group, the boundary input group is retained.

[0065] In this embodiment, the load increment of the boundary input group refers to the sum of the target load increases allocated to each high-pressure alkaline electrolyzer unit in the boundary input group during this round of input sequence; when the high-pressure alkaline electrolyzer unit in the boundary input group has not yet been allocated a single-cell target load change, except for the last high-pressure alkaline electrolyzer unit in the arrangement, the target load increase of the remaining high-pressure alkaline electrolyzer units is taken as the corresponding available load margin, and the target load increase of the last high-pressure alkaline electrolyzer unit in the arrangement is taken as the remaining power required to reach the power change range of the wind curtailment rising stage.

[0066] When the grid connection point voltage deviation is not higher than the grid connection point voltage deviation operating boundary, the frequency deviation is not higher than the frequency deviation operating boundary, the transformer load rate is not higher than the transformer load rate operating boundary, and the line power flow margin is not lower than the load increment of the boundary input group, the boundary input group is retained; if the line power flow margin is lower than the load increment of the boundary input group, the high-voltage alkaline electrolytic cell unit is reduced forward according to the end of the boundary input group arrangement until the load increment of the reduced boundary input group is not higher than the line power flow margin; if any one of the grid connection point voltage deviation, frequency deviation, or transformer load rate exceeds the corresponding grid connection operating boundary, no input order is generated in this round, and the boundary retention group and the boundary exit group continue to enter the sorting process.

[0067] S5.3 Arrange the high-voltage alkaline electrolytic cells in the boundary input group from largest to smallest in terms of load increase margin; arrange the high-voltage alkaline electrolytic cells in the boundary holding group from lowest to highest in terms of current load; and arrange the high-voltage alkaline electrolytic cells in the boundary exit group from largest to smallest in terms of load reduction margin.

[0068] S5.4. Based on the arrangement results of the boundary input group, boundary maintenance group, and boundary exit group, generate the input order, maintenance order, and exit order in sequence, and form a staggered input sequence from the input order, maintenance order, and exit order.

[0069] It should be noted that step S5 allows for the further superposition of grid connection point voltage deviation, frequency deviation, transformer load rate, line power flow margin, cell voltage boundary, and cell temperature boundary on the basis of the candidate group. This solves the technical problem that the grid connection operation may exceed the boundary or the electrolyzer unit operation may exceed the boundary when the switching sequence is generated solely based on the wind curtailment power and the single cell load margin. This ensures that the staggered peak switching sequence simultaneously meets the wind curtailment consumption requirements, grid connection operation constraints, and electrolyzer unit safety operation constraints, reducing the impact of excessively rapid commissioning, delayed decommissioning, and abnormal boundary conditions on the continuous operation of the hydrogen production station.

[0070] S6. Based on the actual load changes, switching completion status, cell voltage protection status, and cell temperature protection status of each high-pressure alkaline electrolytic cell unit, rearrange the subsequent switching sequence in the staggered switching sequence. Note that the following should be noted in this step: S6.1 According to the switching sequence in the staggered switching sequence, obtain the actual load change and switching completion status of the high-voltage alkaline electrolytic cell unit that has been switched, and compare the actual load change with the target load change in the staggered switching sequence.

[0071] In this embodiment, the target load change is the change in DC power allocated to the corresponding high-voltage alkaline electrolyzer unit in the staggered peak switching sequence. For the commissioning sequence, the target load change is the increase in target load, allocated from front to back according to the power change amplitude of the wind curtailment rising phase. The first high-voltage alkaline electrolyzer unit is allocated according to its load increase margin, and the last high-voltage alkaline electrolyzer unit is allocated according to the remaining power to be absorbed. For the maintenance sequence, the target load change is 0 MW. When the wind curtailment stability fluctuation is level 3 or level 4, the target load change is an increase or decrease not higher than the maximum adjacent change value of the stability phase, and this increase or decrease must not cause the current load of the corresponding high-voltage alkaline electrolyzer unit to exceed the stable operating load range. For the decommissioning sequence, the target load change is the decrease in target load, allocated from front to back according to the power change amplitude of the wind curtailment falling phase. The first high-voltage alkaline electrolyzer unit is allocated according to its load reduction margin, and the last high-voltage alkaline electrolyzer unit is allocated according to the remaining power to be reduced.

[0072] For example, if E03, E01, and E04 are arranged in sequence, and the power change range of the wind curtailment rise phase is 6MW, the load increase margin of E03 is 2.50MW, the load increase margin of E01 is 1.50MW, and the load increase margin of E04 is 2.80MW, then the target load change of E03 is an increase of 2.50MW, the target load change of E01 is an increase of 1.50MW, and the target load change of E04 is an increase of 2.00MW.

[0073] When the actual load change is obtained, the current switching position is determined according to the switching sequence in the peak-shifting sequence. The high-voltage alkaline electrolyzer unit before the current switching position is regarded as the high-voltage alkaline electrolyzer unit that has been switched. The DC power of the high-voltage alkaline electrolyzer unit that has been switched is taken as the DC power at the sampling moment before the switching command is issued. The DC power after switching is taken as the DC power at the first sampling moment after the high-voltage alkaline electrolyzer unit control cabinet returns the switching position signal. If the high-voltage alkaline electrolyzer unit control cabinet does not return the switching position signal, the DC power after switching is taken as the DC power corresponding to 60 seconds after the switching command is issued.

[0074] Specifically, the actual load change is obtained from the power difference between the DC power before and after switching.

[0075] When the actual load change is not lower than the target load change, the switching status of the corresponding high-voltage alkaline electrolyzer unit is marked as completed; when the actual load change is lower than the target load change, or the high-voltage alkaline electrolyzer unit control cabinet does not return a switching signal, the switching status of the corresponding high-voltage alkaline electrolyzer unit is marked as incomplete.

[0076] S6.2 When the actual load change is less than the target load change, or when the switching completion status is incomplete, the corresponding high-voltage alkaline electrolytic cell unit is removed from the subsequent switching sequence of the staggered switching sequence.

[0077] Specifically, when the actual load change of a high-voltage alkaline electrolyzer unit that has already been switched is lower than the target load change, or when the switching completion status is incomplete, the high-voltage alkaline electrolyzer unit is removed from the subsequent switching sequence of the staggered switching sequence. This removal operation only applies to subsequent switching sequences that have not yet been executed and does not change the switching results that have already been completed. The removed high-voltage alkaline electrolyzer unit will no longer participate in the subsequent rearrangement in this round. After the next round of sampling re-obtains its current load, cell pressure status, and cell temperature status, it will enter the new high-voltage alkaline electrolyzer load increase / decrease matrix.

[0078] S6.3 When the cell voltage protection state or cell temperature protection state of the corresponding high-voltage alkaline electrolytic cell unit is triggered, the corresponding high-voltage alkaline electrolytic cell unit is removed from the subsequent switching sequence of the staggered switching sequence.

[0079] In this embodiment, the cell voltage protection state includes an untriggered state and a protected state. Specifically, the cell voltage protection state is determined by comparing the cell voltage state with the cell voltage protection boundary and combining the cell voltage protection signal fed back by the high-voltage alkaline electrolytic cell unit control cabinet. The cell voltage protection boundary includes a lower cell voltage protection boundary and an upper cell voltage protection boundary. In this embodiment, the lower cell voltage protection boundary is 1.70V and the upper cell voltage protection boundary is 2.25V. When the cell voltage state is lower than 1.70V and higher than 2.25V, or when the high-voltage alkaline electrolytic cell unit control cabinet feeds back a cell voltage protection signal, the cell voltage protection state is marked as protected and triggered. When the cell voltage state is not lower than 1.70V and not higher than 2.25V, and the high-voltage alkaline electrolytic cell unit control cabinet does not feed back a cell voltage protection signal, the cell voltage protection state is marked as untriggered.

[0080] In this embodiment, the cell temperature protection status includes an untriggered state and a triggered state. Specifically, the cell temperature protection status is determined by comparing the cell temperature status with the cell temperature protection boundary and combining the cell temperature protection signal fed back by the high-voltage alkaline electrolytic cell unit control cabinet. The cell temperature protection boundary includes a lower boundary and an upper boundary. In this embodiment, the lower boundary is 60°C and the upper boundary is 92°C. When the cell temperature status is below 60°C or above 92°C, or when the high-voltage alkaline electrolytic cell unit control cabinet feeds back a cell temperature protection signal, the cell temperature protection status is marked as triggered. When the cell temperature status is not below 60°C and not above 92°C, and the high-voltage alkaline electrolytic cell unit control cabinet does not feed back a cell temperature protection signal, the cell temperature protection status is marked as untriggered.

[0081] When the cell voltage protection status or cell temperature protection status of the corresponding high-voltage alkaline electrolytic cell unit is triggered, the high-voltage alkaline electrolytic cell unit is removed from the subsequent switching sequence of the staggered switching sequence; wherein, the high-voltage alkaline electrolytic cell unit does not participate in the subsequent rearrangement of the current round of input, maintenance or withdrawal sequence.

[0082] S6.4. The high-voltage alkaline electrolytic cell units that have not been removed from the staggered peak switching sequence are rearranged according to the load increase rate, load decrease rate, load increase margin, and load decrease margin in the high-voltage alkaline electrolytic cell load increase / decrease matrix to generate the rearranged staggered peak switching sequence.

[0083] It should be noted that step S6 enables the dynamic elimination of abnormal high-pressure alkaline electrolyzer units based on actual load changes, switching completion status, cell pressure protection status, and cell temperature protection status during the staggered peak switching sequence execution. The remaining high-pressure alkaline electrolyzer units are then reordered, resolving the technical issues of increased load deviation and equipment risk caused by insufficient response from a single cell or continued participation in subsequent switching after protection triggering. This allows the staggered peak switching process of the electrolyzer group to adjust the subsequent sequence promptly based on on-site feedback, improving the continuity of the wind curtailment process and the operational safety of the electrolyzer group.

[0084] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for staggered peak switching of electrolytic cell clusters based on wind curtailment section identification, characterized in that, include: Based on the power difference relationship between wind power output, grid-connected restricted power, and the current absorbed power of the high-voltage alkaline electrolyzer group, the wind curtailment rise segment, wind curtailment stable segment, and wind curtailment fall segment are divided, and a wind curtailment segment index is generated. Based on the location and magnitude of power change in each wind curtailment section in the aforementioned wind curtailment section index, a wind curtailment section slope index is generated. Based on the current load, load increase rate, load decrease rate, available load increase margin, available load decrease margin, cell pressure status, and cell temperature status of each high-pressure alkaline electrolytic cell unit, a high-pressure alkaline electrolytic cell load increase / decrease matrix is ​​generated. The slope index of the wind curtailment section is matched with the load increase / decrease matrix of the high-pressure alkaline electrolyzer to generate candidate input groups, candidate maintenance groups, and candidate exit groups. Based on the grid connection point voltage deviation, frequency deviation, transformer load rate, line power flow margin, slot voltage boundary, and slot temperature boundary, the candidate input group, the candidate retention group, and the candidate exit group are screened and sorted to generate a staggered peak switching sequence. Based on the actual load changes, switching completion status, cell pressure protection status, and cell temperature protection status of each high-pressure alkaline electrolytic cell unit, the subsequent switching sequence in the staggered switching sequence is rearranged.

2. The method for staggered peak switching of electrolytic cell groups based on wind curtailment section identification according to claim 1, characterized in that, Generating the wind curtailment section index includes: The wind power output, grid-connected restricted power, and current absorbed power of the high-voltage alkaline electrolyzer group are arranged according to the same sampling time to obtain the wind power output sequence, grid-connected restricted power sequence, and current absorbed power sequence; The wind power output sequence is subtracted from the grid-limited power sequence item by item to obtain the grid-limited difference sequence; the grid-limited difference sequence is subtracted from the current absorbed power sequence item by item to obtain the absorbed remaining difference sequence; the power difference relationship is formed by the grid-limited difference sequence and the absorbed remaining difference sequence. In the absorption residual difference sequence, the position that changes from less than or equal to zero to greater than zero is taken as the wind curtailment start position, the position that changes from greater than zero to less than or equal to zero is taken as the wind curtailment end position, and the interval between the wind curtailment start position and the wind curtailment end position is taken as the wind curtailment candidate interval. Within the candidate interval for wind curtailment, the intervals for increasing, maintaining, and decreasing values ​​of the remaining difference sequence are sequentially divided into a rising wind curtailment interval, a stable wind curtailment interval, and a falling wind curtailment interval. The wind curtailment interval index is generated according to the order of the wind curtailment start position, the rising wind curtailment interval, the stable wind curtailment interval, the falling wind curtailment interval, and the ending wind curtailment position.

3. The method for staggered peak switching of electrolytic cell groups based on wind curtailment section identification according to claim 1 or 2, characterized in that, Generating the slope index of the wind curtailment section includes: Based on the wind curtailment section index, extract the absorption residual difference sequence in the wind curtailment rising section, the wind curtailment stable section and the wind curtailment falling section respectively, and obtain the first absorption residual difference and the last absorption residual difference in each wind curtailment section respectively. The difference between the last remaining absorption difference and the first remaining absorption difference in the wind curtailment rising section is taken as the power change amplitude of the wind curtailment rising section, and the difference between the first remaining absorption difference and the last remaining absorption difference in the wind curtailment falling section is taken as the power change amplitude of the wind curtailment falling section. The ratio of the power change amplitude of the wind curtailment rising phase to the duration of the wind curtailment rising phase is taken as the wind curtailment rising slope, and the ratio of the power change amplitude of the wind curtailment falling phase to the duration of the wind curtailment falling phase is taken as the wind curtailment falling slope. Based on the variation range of the remaining difference between adjacent wind curtailment absorption values ​​within the stable wind curtailment segment, a stable wind curtailment fluctuation amount is generated, and a wind curtailment segment slope index is generated according to the arrangement order of the wind curtailment rise slope, the stable wind curtailment fluctuation amount, and the wind curtailment fall slope.

4. The method for staggered peak switching of electrolytic cell groups based on wind curtailment section identification according to claim 3, characterized in that, Generating the aforementioned wind curtailment stability fluctuation includes: According to the arrangement order of the remaining absorption differences within the stable wind curtailment section, the remaining absorption differences of two adjacent values ​​are subtracted one by one to obtain the adjacent change values ​​of the stable section; the positive, negative and zero values ​​of the adjacent change values ​​of the stable section are arranged in the order of appearance to generate the change sequence of the stable section; the fluctuation level of the stable section is generated according to the number of alternations of positive and negative values, the number of consecutive positive values ​​and the number of consecutive negative values ​​in the change sequence of the stable section; the maximum absolute value of the adjacent change values ​​of the stable section is taken as the maximum adjacent change value of the stable section, and the stable fluctuation level and the maximum adjacent change value of the stable section constitute the stable wind curtailment fluctuation amount.

5. The method for staggered peak switching of electrolytic cell groups based on wind curtailment section identification according to claim 4, characterized in that, The stability fluctuation levels include stability level 1, stability level 2, stability level 3, and stability level 4, wherein: When all adjacent changes in the stable segment of the stable segment change sequence are zero, the stable segment of wind curtailment is marked as the first level of stable segment. When the adjacent change values ​​of the stable segment in the stable segment change sequence include positive or negative values, and the positive and negative values ​​do not alternate, the stable segment of wind curtailment is marked as the second level of stable segment. When the adjacent change values ​​of the stable segment in the stable segment change sequence include alternating positive and negative values, and the absolute value of each adjacent change value of the stable segment is less than or equal to the minimum load adjustment step size of a single trough, the stable segment of wind curtailment is marked as the third level of stable operation. When there is an adjacent change value of a stable segment in the stable segment change sequence whose absolute value is greater than the minimum load adjustment step size of a single trough, the stable segment of wind curtailment is marked as the fourth level of stable operation.

6. The method for staggered peak switching of electrolytic cell groups based on wind curtailment section identification according to claim 1, characterized in that, Generating the load shifting matrix of the high-pressure alkaline electrolyzer includes: The row identifier is the high-pressure alkaline electrolytic cell unit number, and the column identifier is the current load, load increase rate, load decrease rate, load increase margin, load decrease margin, cell pressure status, and cell temperature status. The current load, load increase rate, load decrease rate, load increase margin, load decrease margin, cell pressure status, and cell temperature status of the same high-pressure alkaline electrolytic cell unit are arranged according to the column identifiers to form an electrolytic cell unit status row. Arrange the status rows of each electrolytic cell unit according to the row identifier to generate the load increase / decrease matrix of the high-pressure alkaline electrolytic cell.

7. The method for staggered peak switching of electrolytic cell groups based on wind curtailment section identification according to claim 6, characterized in that, Matching the slope index of the wind curtailment section with the load shifting matrix of the high-pressure alkaline electrolyzer includes: Compare the curtailment slope in the curtailment slope index with the load increase rate in the high-pressure alkaline electrolyzer load increase matrix item by item. Arrange the high-pressure alkaline electrolyzer units with load increase rates greater than or equal to the curtailment slope in descending order of load increase margin. Then, classify the range of units with accumulated load increase margins greater than or equal to the power change range of the curtailment rising section into the candidate input group. The wind curtailment stability fluctuation in the wind curtailment slope index is compared item by item with the load increase margin and load decrease margin in the high-pressure alkaline electrolyzer load increase / decrease matrix, and the current load is compared item by item with the stable operating load range of the high-pressure alkaline electrolyzer unit; high-pressure alkaline electrolyzer units whose current load is within the stable operating load range, whose load increase margin is greater than or equal to the wind curtailment stability fluctuation, and whose load decrease margin is greater than or equal to the wind curtailment stability fluctuation are included in the candidate retention group. The curtailment slope in the curtailment section slope index is compared item by item with the load reduction rate in the high-pressure alkaline electrolyzer load increase / decrease matrix. High-pressure alkaline electrolyzer units with load reduction rates greater than or equal to the curtailment slope are arranged in descending order of load reduction margin. The range of units with accumulated load reduction margins greater than or equal to the power change amplitude of the curtailment section is included in the candidate exit group.

8. The method for staggered peak switching of electrolytic cell groups based on wind curtailment section identification according to claim 1, characterized in that, Generating the staggered peak switching sequence includes: The high-pressure alkaline electrolytic cell units in the candidate input group, the candidate retention group, and the candidate exit group are compared with the cell pressure boundary and the cell temperature boundary, respectively; the high-pressure alkaline electrolytic cell units with cell pressure states greater than or equal to the lower cell pressure boundary and less than or equal to the upper cell pressure boundary, and cell temperature states greater than or equal to the lower cell temperature boundary and less than or equal to the upper cell temperature boundary are retained, forming the boundary input group, the boundary retention group, and the boundary exit group, respectively. The grid connection point voltage deviation, frequency deviation, and transformer load rate are compared with the corresponding grid connection operation boundaries, and the line power flow margin is compared with the cumulative value of the load increase margin of the boundary input group. When the grid connection point voltage deviation, frequency deviation, and transformer load rate are all less than or equal to the corresponding grid connection operation boundaries, and the line power flow margin is greater than or equal to the cumulative value of the load increase margin of the boundary input group, the boundary input group is retained. The high-voltage alkaline electrolytic cells in the boundary input group are arranged from largest to smallest in terms of load increase margin; the high-voltage alkaline electrolytic cells in the boundary holding group are arranged from lowest to highest in terms of current load; and the high-voltage alkaline electrolytic cells in the boundary exit group are arranged from largest to smallest in terms of load reduction margin. Based on the arrangement of the boundary input group, the boundary hold group, and the boundary exit group, the input order, hold order, and exit order are generated sequentially, and the input order, the hold order, and the exit order constitute the staggered input sequence.

9. The method for staggered peak switching of electrolytic cell groups based on wind curtailment section identification according to claim 8, characterized in that, The subsequent cutting order in the staggered cutting sequence is rearranged, including: According to the switching sequence in the staggered switching sequence, the actual load change and switching completion status of the high-voltage alkaline electrolyzer unit that has been switched are obtained, and the actual load change is compared with the target load change in the staggered switching sequence. When the actual load change is less than the target load change, or when the switching completion status is incomplete, the corresponding high-voltage alkaline electrolytic cell unit is removed from the subsequent switching sequence of the staggered switching sequence; When the cell voltage protection state or cell temperature protection state of the corresponding high-voltage alkaline electrolytic cell unit is triggered, the corresponding high-voltage alkaline electrolytic cell unit is removed from the subsequent switching sequence of the staggered switching sequence. The high-voltage alkaline electrolytic cell units that were not removed from the staggered peak switching sequence are rearranged according to the load increase rate, load decrease rate, load increase margin, and load decrease margin in the high-voltage alkaline electrolytic cell load increase / decrease matrix to generate a rearranged staggered peak switching sequence.

10. The method for staggered peak switching of electrolytic cell groups based on wind curtailment section identification according to claim 9, characterized in that, The acquisition of the actual load change and switching completion status of the high-voltage alkaline electrolyzer unit that has been switched on includes: According to the switching sequence in the staggered peak switching sequence, the current switching position is determined, and the high-voltage alkaline electrolyzer units preceding the current switching position are considered as those that have already been switched. The DC power of the high-voltage alkaline electrolyzer units before and after switching is compared to generate the actual load change. The actual load change is then compared with the corresponding target load change in the staggered peak switching sequence. When the actual load change is greater than or equal to the target load change, the switching completion status is marked as completed; When the actual load change is less than the target load change, or when the control cabinet of the high-pressure alkaline electrolytic cell unit does not return a switching signal, the switching completion status is marked as incomplete.

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