A power grid frequency modulation method and device based on an offshore wind power cluster, a terminal device, and a storage medium

Abstract

The application discloses a kind of based on offshore wind power cluster's power grid frequency modulation method, device, terminal equipment and storage medium, by calculating initial frequency modulation capacity shortage expectation according to frequency modulation capacity demand, first frequency modulation capacity and second frequency modulation capacity, determine the probability that current cannot satisfy power grid frequency modulation capacity demand, when determining that initial frequency modulation capacity shortage expectation is less than the target frequency modulation capacity shortage expectation corresponding to frequency modulation capacity demand, by adjusting frequency modulation ratio, initial frequency modulation capacity shortage expectation gradually approaches target frequency modulation capacity shortage expectation, calculate the target frequency modulation ratio that offshore wind power cluster can just satisfy frequency modulation demand, then determine the target frequency modulation capacity that offshore wind power cluster participates in power grid frequency modulation.Therefore, the frequency modulation capacity of offshore wind power cluster is estimated quantitatively by the present application, so as to accurately calculate the target frequency modulation capacity required for wind power cluster to participate in frequency modulation under different frequency modulation capacity demands, which effectively reduces the difficulty of power grid frequency modulation.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a method, device, terminal equipment and storage medium for power grid frequency regulation based on an offshore wind power cluster. Background Art

[0002] To ensure the stable operation of the power system, new energy sites such as offshore wind power clusters need to have a certain frequency regulation capability, so as to avoid continuous frequency drops due to insufficient frequency regulation capability and waste of resources due to excessive frequency regulation capability.

[0003] However, it is difficult to quantify and estimate the frequency regulation capability of offshore wind farms because they are affected by many uncertain factors such as wind resources and their own operating status. This makes it difficult to adjust the output power of offshore wind power clusters participating in the power grid during frequency regulation, which easily causes frequency fluctuations and increases the difficulty of frequency regulation. Summary of the Invention

[0004] The embodiments of the present invention provide a grid frequency regulation method, apparatus, terminal device, and storage medium based on an offshore wind power cluster. The frequency regulation capability of the offshore wind power cluster is quantitatively estimated by calculating the frequency regulation capacity shortfall to an expected value. This allows for accurate calculation of the target proportion of frequency regulation that the wind power cluster needs to participate in under different frequency regulation capacity requirements, effectively reducing the difficulty of grid frequency regulation.

[0005] An embodiment of the present invention provides a method for power grid frequency regulation based on an offshore wind power cluster, comprising:

[0006] Obtaining a frequency regulation capacity requirement of a power grid, a first frequency regulation capacity of a plurality of generator sets participating in power grid frequency regulation, and a first output power of an offshore wind power cluster;

[0007] calculating, based on the first output power, a second frequency regulation capacity corresponding to a case where the frequency regulation ratio of the offshore wind power cluster participating in grid frequency regulation is 1;

[0008] Calculating an expected value of an initial frequency regulation capacity shortage based on the frequency regulation capacity demand, the first frequency regulation capacity, and the second frequency regulation capacity; wherein the expected value of an initial frequency regulation capacity shortage is the sum of the product of a probability of the total frequency regulation capacity not meeting the frequency regulation capacity demand when the offshore wind farm cluster and the generator set jointly participate in grid frequency regulation, and the total frequency regulation capacity is the sum of the first frequency regulation capacity and the second frequency regulation capacity;

[0009] comparing the initial expected value of frequency regulation capacity shortage with the target expected value of frequency regulation capacity shortage corresponding to the frequency regulation capacity demand;

[0010] When it is determined that the initial expected value of frequency modulation capacity shortage is less than the target expected value of frequency modulation capacity shortage, iteratively adjusting the frequency modulation ratio so that the initial expected value of frequency modulation capacity shortage gradually approaches the target expected value of frequency modulation capacity shortage, and when it is determined that the initial expected value of frequency modulation capacity shortage is equal to the target expected value of frequency modulation capacity shortage, generating the target frequency modulation ratio;

[0011] According to the target frequency regulation ratio, the target frequency regulation capacity of the offshore wind power cluster participating in grid frequency regulation is determined, and the offshore wind power cluster participates in grid frequency regulation according to the target frequency regulation capacity.

[0012] Furthermore, the calculating, based on the first output power, of a second frequency regulation capacity corresponding to a case where the frequency regulation ratio of the offshore wind power cluster participating in grid frequency regulation is 1 includes:

[0013] Obtaining a second output power of the generator set;

[0014] calculating a sum of the first output power and the second output power to generate a total output power;

[0015] Determining whether a proportion of the first output power in the total output power is greater than a preset proportion threshold;

[0016] If yes, calculating a second frequency modulation capacity according to the first output power and the frequency modulation ratio;

[0017] If not, the second frequency modulation capacity is determined to be 0.

[0018] Furthermore, calculating an expected value of an initial frequency modulation capacity shortage based on the frequency modulation capacity requirement, the first frequency modulation capacity, and the second frequency modulation capacity includes:

[0019] Generate a plurality of start-stop state combinations of the generator set, and calculate the state probability of each start-stop state combination; wherein the start-stop state combination defines the state of each generator set as online or offline;

[0020] Calculating the available frequency regulation capacity of the generator set under each start-stop state combination according to the start-stop state combination and the first frequency regulation capacity;

[0021] An expected value of initial frequency modulation capacity shortage is calculated according to the available frequency modulation capacity, the first frequency modulation capacity, the second frequency modulation capacity, and the state probability.

[0022] Furthermore, the iterative adjustment of the frequency modulation ratio so that the initial expected value of frequency modulation capacity shortage gradually approaches the target expected value of frequency modulation capacity shortage, and generating the target frequency modulation ratio when it is determined that the initial expected value of frequency modulation capacity shortage is equal to the target expected value of frequency modulation capacity shortage, includes:

[0023] Obtaining a preset upper limit of the initial ratio, a lower limit of the initial ratio, and a first adjustment tolerance;

[0024] According to the initial ratio upper limit and the initial ratio lower limit, repeatedly adjusting the frequency modulation ratio by using a first dichotomy iterative operation until a target frequency modulation ratio is generated;

[0025] The first bisection iterative operation includes:

[0026] Obtaining an upper limit and a lower limit of the ratio; wherein, initially, the upper limit of the ratio is the initial upper limit of the ratio, and the lower limit of the ratio is the initial lower limit of the ratio;

[0027] Calculating an average of the upper limit of the ratio and the lower limit of the ratio as the frequency modulation ratio to be evaluated;

[0028] Calculating a third frequency regulation capacity of the offshore wind power cluster participating in frequency regulation according to the frequency regulation ratio to be assessed, and calculating a corresponding expected value of a first frequency regulation capacity shortfall to be assessed according to the frequency regulation capacity demand, the first frequency regulation capacity, and the third frequency regulation capacity;

[0029] When it is determined that the first expected value of frequency modulation capacity shortage to be evaluated is less than the expected value of target frequency modulation capacity shortage, setting the frequency modulation ratio to be evaluated as an upper limit of the ratio to be evaluated, and calculating a first difference between the upper limit of the ratio to be evaluated and the lower limit of the ratio;

[0030] When it is determined that the first expected value of frequency modulation capacity shortage to be evaluated is not less than the expected value of target frequency modulation capacity shortage, setting the frequency modulation ratio to be evaluated as a lower limit of the ratio to be evaluated, and calculating a second difference between the upper limit of the ratio and the lower limit of the ratio to be evaluated;

[0031] determining whether the first difference or the second difference is less than the first adjustment tolerance;

[0032] If so, determining that the initial frequency modulation capacity shortage expected value is equal to the target frequency modulation capacity shortage expected value, ending the first dichotomy iterative operation, and using the frequency modulation ratio to be evaluated as the target frequency modulation ratio;

[0033] If not, the upper limit of the ratio to be evaluated and the lower limit of the ratio are used as the upper limit of the ratio and the lower limit of the ratio required for the next round of the first dichotomy iteration operation respectively; or

[0034] The upper limit of the ratio and the lower limit of the ratio to be evaluated are respectively used as the upper limit of the ratio and the lower limit of the ratio required for the next round of the first dichotomy iterative operation.

[0035] Furthermore, after comparing the initial expected value of frequency modulation capacity shortage with the target expected value of frequency modulation capacity shortage corresponding to the frequency modulation capacity demand, the method further includes:

[0036] When it is determined that the expected value of the initial frequency regulation capacity shortage is not less than the expected value of the target frequency regulation capacity shortage, the frequency regulation ratio is set to a fixed value, and a target energy storage capacity is iteratively calculated; wherein the target energy storage capacity is the energy storage capacity required to be increased by the offshore wind power cluster to just meet the frequency regulation capacity requirement when the offshore wind power cluster participates in grid frequency regulation;

[0037] An energy storage configuration planning scheme for the offshore wind power cluster is generated according to the target energy storage capacity.

[0038] Furthermore, setting the frequency modulation ratio to a fixed value and iteratively calculating the target energy storage capacity includes:

[0039] Obtaining a preset initial capacity upper limit, an initial capacity lower limit, and a second adjustment tolerance;

[0040] According to the initial capacity upper limit and the initial capacity lower limit, repeatedly calculating the energy storage capacity using a second dichotomy iterative operation until a target frequency regulation capacity is generated;

[0041] The second bisection iterative operation includes:

[0042] Obtaining an upper capacity limit and a lower capacity limit; wherein, initially, the upper capacity limit is the initial upper capacity limit, and the lower capacity limit is the initial lower capacity limit;

[0043] Taking the average value of the upper capacity limit and the lower capacity limit as the energy storage capacity to be evaluated;

[0044] Calculating a corresponding expected value of a second frequency regulation capacity shortage to be evaluated based on the energy storage capacity to be evaluated, the frequency regulation capacity requirement, the first frequency regulation capacity, and the second frequency regulation capacity;

[0045] When it is determined that the second expected value of the frequency regulation capacity shortage to be evaluated is less than the expected value of the target frequency regulation capacity shortage, setting the energy storage capacity to be evaluated as an upper limit of the capacity to be evaluated, and calculating a third difference between the upper limit of the capacity to be evaluated and the lower limit of the capacity;

[0046] When it is determined that the second expected value of the frequency regulation capacity shortage to be evaluated is not less than the expected value of the target frequency regulation capacity shortage, setting the energy storage capacity to be evaluated as the lower limit of the capacity to be evaluated, and calculating a fourth difference between the upper limit of the capacity and the lower limit of the capacity to be evaluated;

[0047] determining whether the third difference or the fourth difference is less than the second adjustment tolerance;

[0048] If yes, then the second dichotomy iterative operation is terminated, and the energy storage capacity to be evaluated is used as the target energy storage capacity;

[0049] If not, the upper capacity limit to be evaluated and the lower capacity limit are used as the upper capacity limit and the lower capacity limit required for the next round of second dichotomy iterative operation, respectively; or

[0050] The upper capacity limit and the lower capacity limit to be evaluated are respectively used as the upper capacity limit and the lower capacity limit required for the next round of second dichotomy iterative operation.

[0051] Another embodiment of the present invention provides a power grid frequency regulation device based on an offshore wind power cluster, comprising:

[0052] A data acquisition module is used to obtain the frequency regulation capacity demand of the power grid, the first frequency regulation capacity of a plurality of generator sets participating in the power grid frequency regulation, and the first output power of the offshore wind power cluster;

[0053] A first calculation module is configured to calculate, based on the first output power, a second frequency regulation capacity corresponding to a case where the frequency regulation ratio of the offshore wind power cluster participating in grid frequency regulation is 1;

[0054] a second calculation module, configured to calculate an expected value of an initial frequency regulation capacity shortage based on the frequency regulation capacity demand, the first frequency regulation capacity, and the second frequency regulation capacity; wherein the expected value of the initial frequency regulation capacity shortage is the sum of the product of a probability of the total frequency regulation capacity not meeting the frequency regulation capacity demand when the offshore wind power cluster and the generator sets jointly participate in grid frequency regulation, and the total frequency regulation capacity is the sum of the first frequency regulation capacity and the second frequency regulation capacity;

[0055] A data comparison module is used to compare the initial expected value of frequency regulation capacity shortage with the target expected value of frequency regulation capacity shortage corresponding to the frequency regulation capacity demand;

[0056] a data iteration module configured to, when determining that the initial expected value of frequency modulation capacity shortage is less than the target expected value of frequency modulation capacity shortage, iteratively adjust the frequency modulation ratio so that the initial expected value of frequency modulation capacity shortage gradually approaches the target expected value of frequency modulation capacity shortage, and generate the target frequency modulation ratio when determining that the initial expected value of frequency modulation capacity shortage is equal to the target expected value of frequency modulation capacity shortage;

[0057] The frequency regulation module is used to determine the target frequency regulation capacity of the offshore wind power cluster participating in the grid frequency regulation according to the target frequency regulation ratio, and participate in the grid frequency regulation according to the target frequency regulation capacity.

[0058] Furthermore, the calculating, based on the first output power, of a second frequency regulation capacity corresponding to a case where the frequency regulation ratio of the offshore wind power cluster participating in grid frequency regulation is 1 includes:

[0059] Obtaining a second output power of the generator set;

[0060] calculating a sum of the first output power and the second output power to generate a total output power;

[0061] Determining whether a proportion of the first output power in the total output power is greater than a preset proportion threshold;

[0062] If yes, calculating a second frequency modulation capacity according to the first output power and the frequency modulation ratio;

[0063] If not, the second frequency modulation capacity is determined to be 0.

[0064] Another embodiment of the present invention provides a terminal device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, it implements a grid frequency regulation method based on an offshore wind power cluster as described in any one of the embodiments.

[0065] Another embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute a grid frequency regulation method based on an offshore wind power cluster as described in any of the above embodiments.

[0066] The following beneficial effects are achieved by implementing the present invention:

[0067] The present invention discloses a grid frequency regulation method, device, terminal equipment and storage medium based on an offshore wind power cluster. The method calculates an expected value of initial frequency regulation capacity deficiency based on the frequency regulation capacity demand of the grid, a first frequency regulation capacity of a generator set, and a second frequency regulation capacity corresponding to the case where all offshore wind power clusters participate in grid frequency regulation, so as to estimate the probability that the frequency regulation capacity demand cannot be met at the moment, and quantify the frequency regulation capability of the offshore wind power cluster. The expected value of initial frequency regulation capacity deficiency is then compared with a target expected value of frequency regulation capacity deficiency corresponding to the frequency regulation capacity demand. When it is determined that the expected value of initial frequency regulation capacity deficiency is less than the target expected value of frequency regulation capacity deficiency, it is determined that the frequency regulation ratio of the offshore wind power cluster participating in grid frequency regulation is too high. By adjusting the frequency regulation ratio, the expected value of initial frequency regulation capacity deficiency is gradually brought close to the target expected value of frequency regulation capacity deficiency, and the target frequency regulation capacity of the offshore wind power cluster participating in frequency regulation is calculated under the condition that the frequency regulation demand can be just met. Therefore, the present invention quantitatively estimates the frequency regulation capability of the offshore wind power cluster by calculating the frequency regulation capacity shortfall to an expected value, thereby accurately calculating the target frequency regulation capacity required for the wind power cluster to participate in frequency regulation under different frequency regulation capacity requirements, effectively reducing the difficulty of grid frequency regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 This is a flow chart of a method for frequency regulation of a power grid based on an offshore wind power cluster provided by one embodiment of the present invention.

[0069] Figure 2 This is a structural diagram of a power grid frequency regulation device based on an offshore wind power cluster provided by an embodiment of the present invention.

[0070] Figure 3 This is another flow chart of a method for frequency regulation of a power grid based on an offshore wind power cluster provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0071] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0073] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0074] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0075] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0076] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0077] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0078] See also Figure 1 , is a flow chart of a method for frequency regulation of a power grid based on an offshore wind power cluster provided by an embodiment of the present invention, comprising:

[0079] S1. Obtaining the frequency regulation capacity requirement of the power grid, the first frequency regulation capacity of a plurality of generator sets participating in the frequency regulation of the power grid, and the first output power of the offshore wind power cluster;

[0080] In a preferred embodiment of the present invention, the frequency modulation capacity requirement is calculated according to the following formula:

[0081] rd t = a d × d t + a w × P w,t ;

[0082] wherein, rd t represents the frequency modulation capacity demand of the power system at time t; a d represents the load frequency modulation capacity demand ratio, which is 10%; a w represents the output frequency modulation capacity demand ratio of the offshore wind power cluster, which is 7%; d t represents the load level of the power system at time t; P w,t represents the output of the offshore wind power cluster at time t.

[0083] According to the following formula, the first frequency modulation capacity of the generator set participating in the grid frequency modulation is calculated:

[0084] RC g = 0.1 × C g ;

[0085] wherein, RC g represents the first frequency modulation capacity of the generator set g; C g represents the capacity of the generator set g;

[0086] S2, according to the first output power, the corresponding second frequency modulation capacity is calculated under the condition that the frequency modulation ratio of the offshore wind power cluster participating in the grid frequency modulation is 1;

[0087] Preferably, the second frequency modulation capacity corresponding to the first output power under the condition that the frequency modulation ratio of the offshore wind power cluster participating in the grid frequency modulation is 1 is calculated, comprising:

[0088] S21, obtaining the second output power of the generator set;

[0089] S22, calculating the sum of the first output power and the second output power to generate the total output power;

[0090] S23, judging whether the proportion of the first output power in the total output power is greater than a preset proportion threshold;

[0091] S24, if yes, calculating the second frequency modulation capacity according to the first output power and the frequency modulation ratio;

[0092] S25, if no, determining that the second frequency modulation capacity is 0.

[0093] In a preferred embodiment of the present invention, the preset ratio threshold is 10%. When the output of the offshore wind power cluster is lower than 10%, the offshore wind power cluster is set not to participate in frequency regulation. Specifically, the calculation formula of the second frequency regulation capacity is as follows:

[0094]

[0095] Among them, RC w,t represents the frequency regulation capacity of the wind power cluster at time t; P w,t represents the output of the offshore wind power cluster at time t; S w represents the capacity of wind power cluster; β w Indicates the frequency regulation ratio of offshore wind power cluster participating in grid frequency regulation, with a value range of [0,1].

[0096] S3. Calculate an expected value of initial frequency regulation capacity deficiency based on the frequency regulation capacity requirement, the first frequency regulation capacity, and the second frequency regulation capacity; wherein the expected value of initial frequency regulation capacity deficiency is the sum of the product of a probability of the total frequency regulation capacity not meeting the frequency regulation capacity requirement when the offshore wind farm cluster and the generator sets jointly participate in grid frequency regulation, and the total frequency regulation capacity is the sum of the first frequency regulation capacity and the second frequency regulation capacity;

[0097] Preferably, calculating the expected value of the initial frequency modulation capacity shortage according to the frequency modulation capacity requirement, the first frequency modulation capacity, and the second frequency modulation capacity includes:

[0098] S31, generating a plurality of start-stop state combinations of the generator set, and calculating the state probability of each start-stop state combination; wherein the start-stop state combination defines the state of each generator set as online or offline;

[0099] In a preferred embodiment of the present invention, for a generator set Then it generates A combination of start and stop states.

[0100] S32. Calculating the available frequency regulation capacity of the generator set under each start-stop state combination according to the start-stop state combination and the first frequency regulation capacity;

[0101] In a preferred embodiment of the present invention, the available frequency regulation capacity TRC of the generator set is first initialized. k =0, used to accumulate the available frequency modulation capacity in the current state, SP k =1, used to calculate the probability of occurrence of the start-stop state combination. For the start-stop state combination k, traverse all units: if the generator unit g is online, the frequency regulation capacity of the generator unit g is accumulated and the availability rate of the generator unit g is accumulated; if the generator unit g is offline, the unavailability rate of the generator unit g is accumulated. Specifically:

[0102]

[0103] in, For online generator sets, For offline generator sets, is the availability rate of generator set g.

[0104] S33: Calculate an expected value of initial frequency modulation capacity shortage based on the available frequency modulation capacity, the first frequency modulation capacity, the second frequency modulation capacity, and the state probability.

[0105] In a preferred embodiment of the present invention, the expected value of the initial frequency modulation capacity shortage is calculated according to the following formula:

[0106]

[0107] in, Represents a time set; rd t represents the frequency regulation capacity demand of the system at time t; RC w,t represents the second frequency modulation capacity at time t; TRC k It represents the available frequency regulation capacity under the start-stop state combination k.

[0108] S4. Compare the initial expected value of frequency modulation capacity shortage with the target expected value of frequency modulation capacity shortage corresponding to the frequency modulation capacity demand;

[0109] Preferably, after comparing the initial expected value of frequency modulation capacity shortage with the target expected value of frequency modulation capacity shortage corresponding to the frequency modulation capacity demand, the method further includes:

[0110] S41. When it is determined that the expected value of the initial frequency regulation capacity shortage is not less than the expected value of the target frequency regulation capacity shortage, setting the frequency regulation ratio to a fixed value, and iteratively calculating a target energy storage capacity; wherein the target energy storage capacity is the energy storage capacity required to be added by the offshore wind power cluster to just meet the frequency regulation capacity requirement when the offshore wind power cluster participates in grid frequency regulation;

[0111] Preferably, setting the frequency modulation ratio to a fixed value and iteratively calculating the target energy storage capacity includes:

[0112] S411, obtaining a preset upper limit of initial capacity, a lower limit of initial capacity, and a second adjustment tolerance;

[0113] S412: Repeatedly calculate the energy storage capacity using a second dichotomy iterative operation according to the initial capacity upper limit and the initial capacity lower limit until a target frequency regulation capacity is generated;

[0114] The second bisection iterative operation includes:

[0115] S4121. Obtain an upper capacity limit and a lower capacity limit; wherein, initially, the upper capacity limit is the initial upper capacity limit, and the lower capacity limit is the initial lower capacity limit;

[0116] S4122: Taking the average value of the upper capacity limit and the lower capacity limit as the energy storage capacity to be evaluated;

[0117] S4123: Calculate a corresponding expected value of a second frequency regulation capacity shortage to be evaluated based on the energy storage capacity to be evaluated, the frequency regulation capacity requirement, the first frequency regulation capacity, and the second frequency regulation capacity;

[0118] S4124: When it is determined that the second expected value of the frequency regulation capacity shortage to be evaluated is less than the expected value of the target frequency regulation capacity shortage, setting the energy storage capacity to be evaluated as an upper limit of the capacity to be evaluated, and calculating a third difference between the upper limit of the capacity to be evaluated and the lower limit of the capacity;

[0119] S4125: When it is determined that the second expected value of the frequency regulation capacity shortage to be evaluated is not less than the expected value of the target frequency regulation capacity shortage, setting the energy storage capacity to be evaluated as the lower limit of the capacity to be evaluated, and calculating a fourth difference between the upper limit of the capacity and the lower limit of the capacity to be evaluated;

[0120] S4126: Determine whether the third difference or the fourth difference is less than the second adjustment tolerance;

[0121] S4127: If yes, then end the second dichotomy iteration operation and use the energy storage capacity to be evaluated as the target energy storage capacity;

[0122] S4128. If not, use the to-be-evaluated capacity upper limit and the capacity lower limit as the capacity upper limit and capacity lower limit required for the next round of second dichotomy iterative operation, respectively; or

[0123] The upper capacity limit and the lower capacity limit to be evaluated are respectively used as the upper capacity limit and the lower capacity limit required for the next round of second dichotomy iterative operation.

[0124] S42. Generate an energy storage configuration planning scheme for the offshore wind power cluster based on the target energy storage capacity.

[0125] In a preferred embodiment of the present invention, Figure 3 As shown, the corresponding target frequency modulation capacity shortage expected value is calculated according to the frequency modulation capacity demand. It can be understood that the greater the frequency modulation capacity demand, the smaller the corresponding target frequency modulation capacity shortage expected value.

[0126] Therefore, in the frequency modulation ratio β wWhen set to 1, it indicates that the frequency regulation ratio has reached its maximum. That is, even if all offshore wind farms participate in grid frequency regulation, if the initial frequency regulation capacity shortage is still not less than the target frequency regulation capacity shortage, it means that the grid's frequency regulation capacity demand cannot be met at the moment, and it is necessary to plan and increase energy storage capacity to meet the target.

[0127] Specifically, by using the frequency ratio β w The second binary division iteration is used to calculate how much energy storage capacity needs to be added to just meet the grid's frequency regulation capacity requirements. The second binary division iteration is:

[0128] Initialize the upper and lower capacity limits r / l, where l=0. To ensure that the search range is wide enough; initialize the second adjustment tolerance tol = 10 -6 , used to control accuracy;

[0129] The average of the upper and lower limits is used as the energy storage capacity C of the wind power cluster with equal reliability. ES (Energy storage capacity to be evaluated), and the ERCNS of the wind power cluster at this time is calculated by the following formula: wind,on ;

[0130]

[0131] Judgment: If The energy storage capacity of wind power cluster with equal reliability is C ES Too large, the upper limit should be readjusted to r=C ES Otherwise, the wind power cluster energy storage capacity C is equal to the reliability ES Too low, the lower limit should be adjusted to l=C ES ;

[0132] Judgment: If rl≤tol, terminate the process and output the optimal energy storage capacity of the wind power cluster with equal reliability If rl>tol, continue to perform the second bisection iteration operation;

[0133] S5. When it is determined that the initial expected value of frequency modulation capacity shortage is less than the target expected value of frequency modulation capacity shortage, iteratively adjust the frequency modulation ratio so that the initial expected value of frequency modulation capacity shortage gradually approaches the target expected value of frequency modulation capacity shortage, and when it is determined that the initial expected value of frequency modulation capacity shortage is equal to the target expected value of frequency modulation capacity shortage, generate a target frequency modulation ratio;

[0134] Preferably, the iterative adjustment of the frequency modulation ratio so that the initial expected value of frequency modulation capacity shortage gradually approaches the target expected value of frequency modulation capacity shortage, and generating the target frequency modulation ratio when it is determined that the initial expected value of frequency modulation capacity shortage is equal to the target expected value of frequency modulation capacity shortage, includes:

[0135] S51, obtaining a preset upper limit of the initial ratio, a lower limit of the initial ratio, and a first adjustment tolerance;

[0136] S52: repeatedly adjusting the frequency modulation ratio using a first dichotomy iterative operation according to the initial ratio upper limit and the initial ratio lower limit until a target frequency modulation ratio is generated;

[0137] The first bisection iterative operation includes:

[0138] S521. Obtain an upper limit and a lower limit of a ratio; wherein, initially, the upper limit of the ratio is an initial upper limit of the ratio, and the lower limit of the ratio is an initial lower limit of the ratio;

[0139] S522: Calculate an average value of the upper limit of the ratio and the lower limit of the ratio as the frequency modulation ratio to be evaluated;

[0140] S523: Calculate, based on the frequency regulation ratio to be assessed, a third frequency regulation capacity of the offshore wind power cluster participating in frequency regulation, and calculate, based on the frequency regulation capacity demand, the first frequency regulation capacity, and the third frequency regulation capacity, a corresponding expected value of a first frequency regulation capacity shortfall to be assessed;

[0141] S524: When it is determined that the first expected value of the frequency modulation capacity shortage to be evaluated is less than the expected value of the target frequency modulation capacity shortage, setting the frequency modulation ratio to be evaluated as an upper limit of the ratio to be evaluated, and calculating a first difference between the upper limit of the ratio to be evaluated and the lower limit of the ratio;

[0142] S525: When it is determined that the first expected value of the frequency modulation capacity shortage to be evaluated is not less than the expected value of the target frequency modulation capacity shortage, setting the frequency modulation ratio to be evaluated as the lower limit of the ratio to be evaluated, and calculating a second difference between the upper limit of the ratio and the lower limit of the ratio to be evaluated;

[0143] S526: Determine whether the first difference or the second difference is less than the first adjustment tolerance;

[0144] S527: If yes, determine that the initial frequency modulation capacity shortage expected value is equal to the target frequency modulation capacity shortage expected value, end the first dichotomy iteration operation, and use the frequency modulation ratio to be evaluated as the target frequency modulation ratio;

[0145] S528. If not, the upper limit of the ratio to be evaluated and the lower limit of the ratio are used as the upper limit of the ratio and the lower limit of the ratio required for the next round of the first dichotomy iteration operation respectively; or

[0146] The upper limit of the ratio and the lower limit of the ratio to be evaluated are respectively used as the upper limit of the ratio and the lower limit of the ratio required for the next round of the first dichotomy iterative operation.

[0147] In a preferred embodiment of the present invention, when it is determined that the initial frequency regulation capacity shortage expected value is less than the target frequency regulation capacity shortage expected value, the frequency regulation ratio β of the current offshore wind power cluster can be determined. w Too high, that is, if all offshore wind power clusters currently participate in frequency regulation, it will lead to excess system frequency regulation capacity and cause waste of resources. This problem can be solved by adjusting the frequency regulation ratio and reducing the frequency regulation capacity of the offshore wind power clusters participating in frequency regulation.

[0148] Specifically, this embodiment calculates the target frequency modulation ratio through the first dichotomy iterative operation:

[0149] Initially, set the initial ratio upper / lower limit r / l, where l=0, r=1; set the first adjustment tolerance tol=10 -6 , used to control accuracy;

[0150] The middle value of the upper and lower limits is used as the proportion of wind power cluster participating in frequency regulation β w , calculate the corresponding wind power frequency regulation capacity RC by the following formula w,t , get the first expected value of frequency regulation capacity shortage ERCNS to be evaluated wind,on ;

[0151]

[0152] Judgment: If ERCNS wind,on <ERCNS target , then the frequency modulation ratio β w Too high, the upper limit should be readjusted to r = β w Otherwise, the frequency regulation ratio of wind power cluster β w Too low, the lower limit should be adjusted to l = β w ;

[0153] Judgment: If rl≤tol, terminate the process and output the optimal frequency regulation ratio of the wind power cluster with equal reliability If rl>tol, continue to execute the first bisection iteration operation.

[0154] S6. Determine a target frequency regulation capacity for the offshore wind power cluster to participate in grid frequency regulation according to the target frequency regulation ratio, and participate in grid frequency regulation according to the target frequency regulation capacity.

[0155] In a preferred embodiment of the present invention, this embodiment can correctly evaluate the contribution of the offshore wind power cluster to the system frequency regulation based on the optimal frequency regulation ratio and energy storage capacity estimation of the wind power cluster with equal reliability.

[0156] At the planning level, this system supports the access, transmission, and energy storage planning of offshore wind farm clusters: based on system frequency stability requirements, it supports wind farm capacity planning, optimal frequency regulation ratio configuration, and optimal energy storage capacity configuration. Furthermore, line reliability significantly impacts the reliability of offshore wind farm frequency regulation capacity. By comparing the reliability of offshore wind farm frequency regulation capacity at different access points and along different transmission corridors, it can assist in decision-making regarding wind farm access and transmission planning.

[0157] At the level of safe operation, it can ensure that offshore wind power clusters provide frequency regulation services, participate in power system frequency regulation in an orderly manner, and improve the frequency safety and stability of power systems containing a high proportion of renewable energy: based on the output forecast results of the wind power cluster, combined with the system's backup frequency regulation capacity requirements, the power generation plans of conventional units can be arranged more reasonably, thereby economically and reliably ensuring the frequency safety and stability of the power system.

[0158] This embodiment provides a grid frequency regulation method based on an offshore wind power cluster. The method calculates an expected value of initial frequency regulation capacity shortage based on the grid's frequency regulation capacity requirement, a first frequency regulation capacity of a generator set, and a second frequency regulation capacity corresponding to the case where all offshore wind power clusters participate in grid frequency regulation. This is used to estimate the probability that the current frequency regulation capacity requirement cannot be met and to quantify the frequency regulation capability of the offshore wind power cluster. The expected value of initial frequency regulation capacity shortage is then compared with a target expected value of frequency regulation capacity shortage corresponding to the frequency regulation capacity requirement. If the expected value of initial frequency regulation capacity shortage is less than the target expected value of frequency regulation capacity shortage, it is determined that the frequency regulation ratio of the offshore wind power cluster participating in grid frequency regulation is too high. The frequency regulation ratio is adjusted so that the expected value of initial frequency regulation capacity shortage gradually approaches the target expected value of frequency regulation capacity shortage. The target frequency regulation capacity of the offshore wind power cluster participating in frequency regulation is calculated to just meet the frequency regulation requirement. Therefore, the present invention quantitatively estimates the frequency regulation capability of the offshore wind power cluster by calculating the expected value of frequency regulation capacity shortage. This allows accurate calculation of the target frequency regulation capacity required for the wind power cluster to participate in frequency regulation under different frequency regulation capacity requirements, effectively reducing the difficulty of grid frequency regulation.

[0159] See also Figure 2 , is a structural diagram of a power grid frequency regulation device based on an offshore wind power cluster provided by one embodiment of the present invention, comprising:

[0160] A data acquisition module is used to obtain the frequency regulation capacity demand of the power grid, the first frequency regulation capacity of a plurality of generator sets participating in the power grid frequency regulation, and the first output power of the offshore wind power cluster;

[0161] A first calculation module is configured to calculate, based on the first output power, a second frequency regulation capacity corresponding to a case where the frequency regulation ratio of the offshore wind power cluster participating in grid frequency regulation is 1;

[0162] a second calculation module, configured to calculate an expected value of an initial frequency regulation capacity shortage based on the frequency regulation capacity demand, the first frequency regulation capacity, and the second frequency regulation capacity; wherein the expected value of the initial frequency regulation capacity shortage is the sum of the product of a probability of the total frequency regulation capacity not meeting the frequency regulation capacity demand when the offshore wind power cluster and the generator sets jointly participate in grid frequency regulation, and the total frequency regulation capacity is the sum of the first frequency regulation capacity and the second frequency regulation capacity;

[0163] A data comparison module is used to compare the initial expected value of frequency regulation capacity shortage with the target expected value of frequency regulation capacity shortage corresponding to the frequency regulation capacity demand;

[0164] a data iteration module configured to, when determining that the initial expected value of frequency modulation capacity shortage is less than the target expected value of frequency modulation capacity shortage, iteratively adjust the frequency modulation ratio so that the initial expected value of frequency modulation capacity shortage gradually approaches the target expected value of frequency modulation capacity shortage, and generate the target frequency modulation ratio when determining that the initial expected value of frequency modulation capacity shortage is equal to the target expected value of frequency modulation capacity shortage;

[0165] The frequency regulation module is used to determine the target frequency regulation capacity of the offshore wind power cluster participating in the grid frequency regulation according to the target frequency regulation ratio, and participate in the grid frequency regulation according to the target frequency regulation capacity.

[0166] Furthermore, the calculating, based on the first output power, of a second frequency regulation capacity corresponding to a case where the frequency regulation ratio of the offshore wind power cluster participating in grid frequency regulation is 1 includes:

[0167] Obtaining a second output power of the generator set;

[0168] calculating a sum of the first output power and the second output power to generate a total output power;

[0169] Determining whether a proportion of the first output power in the total output power is greater than a preset proportion threshold;

[0170] If yes, calculating a second frequency modulation capacity according to the first output power and the frequency modulation ratio;

[0171] If not, the second frequency modulation capacity is determined to be 0.

[0172] It should be noted that the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed across multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. In addition, in the drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art can understand and implement the present invention without inventive effort.

[0173] Those skilled in the art will clearly understand that for the sake of convenience and brevity, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0174] Another preferred embodiment of the present invention provides a terminal device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, it implements a grid frequency regulation method based on an offshore wind power cluster as described in any one of the above embodiments.

[0175] The terminal device may be a computing device such as a desktop computer, a notebook computer, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0176] The processor may be a central processing unit (CPU), other general-purpose processors, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, connecting various parts of the entire terminal device using various interfaces and lines.

[0177] The memory can be used to store the computer program, and the processor realizes various functions of the terminal device by running or executing the computer program stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Med i aCard, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0178] Another preferred embodiment of the present invention provides a storage medium, which is a computer-readable storage medium, and the computer program is stored in the computer-readable storage medium. When the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, a recording medium, a USB flash drive, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunications signal, and a software distribution medium.

[0179] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for power grid frequency regulation based on offshore wind power clusters, characterized in that: include: Obtaining a frequency regulation capacity requirement of a power grid, a first frequency regulation capacity of a plurality of generator sets participating in power grid frequency regulation, and a first output power of an offshore wind power cluster; Obtaining a second output power of the generator set; calculating the sum of the first output power and the second output power to generate a total output power; and determining whether a proportion of the first output power to the total output power is greater than a preset proportion threshold; If yes, calculating the second frequency modulation capacity according to the first output power and the frequency modulation ratio; if no, determining the second frequency modulation capacity to be 0; generating a plurality of start / stop state combinations of the generator set and calculating a state probability of each start / stop state combination occurring; wherein the start / stop state combination defines the state of each generator set as online or offline; calculating the available frequency regulation capacity of the generator set under each start / stop state combination based on the start / stop state combination and the first frequency regulation capacity; and calculating an expected value of an initial frequency regulation capacity shortage based on the available frequency regulation capacity, the first frequency regulation capacity, the second frequency regulation capacity, and the state probability; comparing the initial expected value of frequency regulation capacity shortage with the target expected value of frequency regulation capacity shortage corresponding to the frequency regulation capacity demand; When it is determined that the initial expected value of frequency modulation capacity shortage is less than the target expected value of frequency modulation capacity shortage, iteratively adjusting the frequency modulation ratio so that the initial expected value of frequency modulation capacity shortage gradually approaches the target expected value of frequency modulation capacity shortage, and when it is determined that the initial expected value of frequency modulation capacity shortage is equal to the target expected value of frequency modulation capacity shortage, generating the target frequency modulation ratio; According to the target frequency regulation ratio, the target frequency regulation capacity of the offshore wind power cluster participating in grid frequency regulation is determined, and the offshore wind power cluster participates in grid frequency regulation according to the target frequency regulation capacity.

2. A method for frequency modulation of a power grid based on an offshore wind power cluster according to claim 1, characterized in that: The iteratively adjusting the frequency modulation ratio so that the initial expected value of frequency modulation capacity shortage gradually approaches the target expected value of frequency modulation capacity shortage, and generating the target frequency modulation ratio when it is determined that the initial expected value of frequency modulation capacity shortage is equal to the target expected value of frequency modulation capacity shortage, includes: Obtaining a preset initial ratio upper limit, initial ratio lower limit, and first adjustment tolerance; According to the initial ratio upper limit and the initial ratio lower limit, repeatedly adjusting the frequency modulation ratio by using a first dichotomy iterative operation until a target frequency modulation ratio is generated; The first dichotomy iterative operation includes: Obtaining an upper limit and a lower limit of the ratio; wherein, initially, the upper limit of the ratio is the initial upper limit of the ratio, and the lower limit of the ratio is the initial lower limit of the ratio; Calculating an average of the upper limit of the ratio and the lower limit of the ratio as the frequency modulation ratio to be evaluated; Calculating a third frequency regulation capacity of the offshore wind power cluster participating in frequency regulation according to the frequency regulation ratio to be assessed, and calculating a corresponding expected value of a first frequency regulation capacity shortfall to be assessed according to the frequency regulation capacity demand, the first frequency regulation capacity, and the third frequency regulation capacity; When it is determined that the first expected value of frequency modulation capacity shortage to be evaluated is less than the expected value of target frequency modulation capacity shortage, setting the frequency modulation ratio to be evaluated as an upper limit of the ratio to be evaluated, and calculating a first difference between the upper limit of the ratio to be evaluated and the lower limit of the ratio; When it is determined that the first expected value of frequency modulation capacity shortage to be evaluated is not less than the expected value of target frequency modulation capacity shortage, setting the frequency modulation ratio to be evaluated as a lower limit of the ratio to be evaluated, and calculating a second difference between the upper limit of the ratio and the lower limit of the ratio to be evaluated; determining whether the first difference or the second difference is less than the first adjustment tolerance; If so, determining that the initial frequency modulation capacity shortage expected value is equal to the target frequency modulation capacity shortage expected value, and ending the first dichotomy iterative operation, and using the frequency modulation ratio to be evaluated as the target frequency modulation ratio; If not, the upper limit of the ratio to be evaluated and the lower limit of the ratio are used as the upper limit of the ratio and the lower limit of the ratio required for the next round of the first dichotomy iteration operation respectively; or The upper limit of the ratio and the lower limit of the ratio to be evaluated are respectively used as the upper limit of the ratio and the lower limit of the ratio required for the next round of the first dichotomy iterative operation.

3. A method for frequency modulation of a power grid based on an offshore wind power cluster according to claim 2, characterized in that: After comparing the initial expected value of frequency modulation capacity shortage with the target expected value of frequency modulation capacity shortage corresponding to the frequency modulation capacity demand, the method further includes: When it is determined that the expected value of the initial frequency regulation capacity shortage is not less than the expected value of the target frequency regulation capacity shortage, the frequency regulation ratio is set to a fixed value, and a target energy storage capacity is iteratively calculated; wherein the target energy storage capacity is the energy storage capacity required to be increased by the offshore wind power cluster to just meet the frequency regulation capacity requirement when the offshore wind power cluster participates in grid frequency regulation; An energy storage configuration planning scheme for the offshore wind power cluster is generated according to the target energy storage capacity.

4. A method for frequency regulation of a power grid based on an offshore wind power cluster according to claim 3, characterized in that: The step of setting the frequency modulation ratio to a fixed value and iteratively calculating the target energy storage capacity includes: Obtaining a preset initial capacity upper limit, an initial capacity lower limit, and a second adjustment tolerance; According to the initial capacity upper limit and the initial capacity lower limit, repeatedly calculating the energy storage capacity using a second dichotomy iterative operation until a target frequency regulation capacity is generated; The second bisection iterative operation includes: Obtaining an upper capacity limit and a lower capacity limit; wherein, initially, the upper capacity limit is the initial upper capacity limit, and the lower capacity limit is the initial lower capacity limit; Taking the average value of the upper capacity limit and the lower capacity limit as the energy storage capacity to be evaluated; Calculating a corresponding expected value of a second frequency regulation capacity shortage to be evaluated based on the energy storage capacity to be evaluated, the frequency regulation capacity requirement, the first frequency regulation capacity, and the second frequency regulation capacity; When it is determined that the second expected value of the frequency regulation capacity shortage to be evaluated is less than the expected value of the target frequency regulation capacity shortage, setting the energy storage capacity to be evaluated as an upper limit of the capacity to be evaluated, and calculating a third difference between the upper limit of the capacity to be evaluated and the lower limit of the capacity; When it is determined that the second expected value of the frequency regulation capacity shortage to be evaluated is not less than the expected value of the target frequency regulation capacity shortage, setting the energy storage capacity to be evaluated as the lower limit of the capacity to be evaluated, and calculating a fourth difference between the upper limit of the capacity and the lower limit of the capacity to be evaluated; determining whether the third difference or the fourth difference is less than the second adjustment tolerance; If yes, then the second dichotomy iterative operation is terminated, and the energy storage capacity to be evaluated is used as the target energy storage capacity; If not, the upper capacity limit to be evaluated and the lower capacity limit are used as the upper capacity limit and the lower capacity limit required for the next round of second dichotomy iterative operation, respectively; or The upper capacity limit and the lower capacity limit to be evaluated are respectively used as the upper capacity limit and the lower capacity limit required for the next round of second dichotomy iterative operation.

5. A power grid frequency regulation device based on an offshore wind power cluster, characterized in that: include: A data acquisition module is used to obtain the frequency regulation capacity demand of the power grid, the first frequency regulation capacity of a plurality of generator sets participating in the power grid frequency regulation, and the first output power of the offshore wind power cluster; a first calculation module, configured to obtain a second output power of the generator set; calculate the sum of the first output power and the second output power to generate a total output power; and determine whether a proportion of the first output power to the total output power is greater than a preset proportion threshold; If yes, calculating a second frequency modulation capacity according to the first output power and the frequency modulation ratio; If not, determining that the second frequency modulation capacity is 0; a second calculation module, configured to generate a plurality of start / stop state combinations of the generator set and calculate a state probability of each start / stop state combination occurring; wherein the start / stop state combination defines the state of each generator set as online or offline; calculate the available frequency regulation capacity of the generator set under each start / stop state combination based on the start / stop state combination and the first frequency regulation capacity; and calculate an expected value of an initial frequency regulation capacity shortage based on the available frequency regulation capacity, the first frequency regulation capacity, the second frequency regulation capacity, and the state probability; A data comparison module is used to compare the initial expected value of frequency regulation capacity shortage with the target expected value of frequency regulation capacity shortage corresponding to the frequency regulation capacity demand; a data iteration module configured to, when determining that the initial expected value of frequency modulation capacity shortage is less than the target expected value of frequency modulation capacity shortage, iteratively adjust the frequency modulation ratio so that the initial expected value of frequency modulation capacity shortage gradually approaches the target expected value of frequency modulation capacity shortage, and generate the target frequency modulation ratio when determining that the initial expected value of frequency modulation capacity shortage is equal to the target expected value of frequency modulation capacity shortage; The frequency regulation module is used to determine the target frequency regulation capacity of the offshore wind power cluster participating in the grid frequency regulation according to the target frequency regulation ratio, and participate in the grid frequency regulation according to the target frequency regulation capacity.

6. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, a grid frequency regulation method based on an offshore wind power cluster is implemented as described in any one of claims 1 to 4.

7. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute a grid frequency regulation method based on an offshore wind power cluster as described in any one of claims 1 to 4.

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