Offshore wind power cluster-based power grid frequency modulation method and device, terminal equipment and storage medium

Abstract

The invention discloses a power grid frequency modulation method and device based on an offshore wind power cluster, terminal equipment and a storage medium, and the method comprises the steps: calculating an initial frequency modulation capacity less than an expected value according to a frequency modulation capacity demand, a first frequency modulation capacity and a second frequency modulation capacity, and determining the probability that the frequency modulation capacity demand of a power grid cannot be met at present; when it is determined that the initial frequency modulation capacity insufficiency expected value is smaller than a target frequency modulation capacity insufficiency expected value corresponding to the frequency modulation capacity requirement, the frequency modulation proportion is adjusted, so that the initial frequency modulation capacity insufficiency expected value gradually approaches the target frequency modulation capacity insufficiency expected value, and the target frequency modulation proportion that the offshore wind power cluster can just meet the frequency modulation requirement is calculated; and then determining the target frequency modulation capacity of the offshore wind power cluster participating in the power grid frequency modulation. Therefore, by quantitatively estimating the frequency modulation capability of the offshore wind power cluster, the target frequency modulation capacity of the wind power cluster needing to participate in frequency modulation under different frequency modulation capacity requirements is accurately calculated, and the difficulty of power grid frequency modulation is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a power grid frequency modulation method, device, terminal equipment and storage medium 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 to avoid waste of resources due to excessive frequency regulation capability.

[0003] However, it is difficult to quantify the frequency regulation capability of offshore wind farms because they are affected by many uncertain factors such as wind resources and their own operating conditions. This makes it difficult to adjust the output power of the offshore wind power cluster 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 equipment 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 short of an expected value. In this way, the target proportion of the wind power cluster required to participate in frequency regulation under different frequency regulation capacity requirements can be accurately calculated, thereby effectively reducing the difficulty of grid frequency regulation.

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

[0006] Obtaining the frequency regulation capacity demand 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;

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

[0008] According to the frequency regulation capacity demand, the first frequency regulation capacity, and the second frequency regulation capacity, an expected value of initial frequency regulation capacity shortage is calculated; wherein the expected value of initial frequency regulation capacity shortage is the sum of the product of the situation where the total frequency regulation capacity does not meet the frequency regulation capacity demand and the probability of occurrence when the offshore wind power 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 modulation capacity shortage with the target expected value of frequency modulation capacity shortage corresponding to the frequency modulation capacity demand;

[0010] When it is determined that the initial frequency modulation capacity shortage expected value is less than the target frequency modulation capacity shortage expected value, iteratively adjust the frequency modulation ratio so that the initial frequency modulation capacity shortage expected value gradually approaches the target frequency modulation capacity shortage expected value, and when it is determined that the initial frequency modulation capacity shortage expected value is equal to the target frequency modulation capacity shortage expected value, generate 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 the grid frequency regulation is determined, and the offshore wind power cluster participates in the grid frequency regulation according to the target frequency regulation capacity.

[0012] Furthermore, the calculation of the second frequency regulation capacity corresponding to the frequency regulation ratio of the offshore wind power cluster participating in the grid frequency regulation is 1 according to the first output power includes:

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

[0014] Calculating the 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] Further, calculating an expected value of initial frequency modulation capacity shortage according to the frequency modulation capacity demand, 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] Calculate 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] Further, 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 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 a target frequency modulation ratio includes:

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

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

[0025] The first binary division iterative operation includes:

[0026] Obtaining 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;

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

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

[0029] 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;

[0030] 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;

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

[0032] If yes, it is determined that the expected value of the initial frequency modulation capacity shortage is equal to the expected value of the target frequency modulation capacity shortage, and the first binary division iteration operation is terminated, and the frequency modulation ratio to be evaluated is used as the target frequency modulation ratio;

[0033] If not, the upper limit of the proportion to be evaluated and the lower limit of the proportion are used as the upper limit of the proportion and the lower limit of the proportion 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 frequency modulation capacity shortage expected value with the target frequency modulation capacity shortage expected value 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 the target energy storage capacity is iteratively calculated; wherein the target energy storage capacity is the energy storage capacity that needs to be increased by the offshore wind power cluster to just meet the frequency regulation capacity demand when the offshore wind power cluster participates in the 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, the energy storage capacity is repeatedly calculated using a second dichotomy iterative operation until a target frequency regulation capacity is generated;

[0041] The second dichotomy iterative operation includes:

[0042] Obtaining an upper capacity limit and a lower capacity limit; wherein, initially, the upper capacity limit is an initial capacity upper limit, and the lower capacity limit is an initial capacity lower 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] Calculate a corresponding expected value of a second frequency regulation capacity shortage to be evaluated according to 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 the 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 capacity limit and the lower capacity limit 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 binary division iteration 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 binary division iteration 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 binary division 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, 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 frequency regulation of the power grid, and the first output power of the offshore wind power cluster;

[0053] A first calculation module is used to calculate, according to the first output power, a corresponding second frequency regulation capacity when the frequency regulation ratio of the offshore wind power cluster participating in the grid frequency regulation is 1;

[0054] a second calculation module, configured to calculate an expected value of initial frequency regulation capacity shortage according to the frequency regulation capacity demand, the first frequency regulation capacity, and the second frequency regulation capacity; wherein the expected value of initial frequency regulation capacity shortage is the sum of the product of the situation where the total frequency regulation capacity does not meet the frequency regulation capacity demand and the probability of occurrence when the offshore wind power 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;

[0055] A data comparison module, used for comparing the expected value of the initial frequency modulation capacity shortage with the expected value of the target frequency modulation capacity shortage corresponding to the frequency modulation capacity demand;

[0056] a data iteration module, configured to iteratively adjust the frequency modulation ratio when it is determined that the expected value of the initial frequency modulation capacity shortage is less than the expected value of the target frequency modulation capacity shortage, so that the expected value of the initial frequency modulation capacity shortage gradually approaches the expected value of the target frequency modulation capacity shortage, and generate a target frequency modulation ratio when it is determined that the expected value of the initial frequency modulation capacity shortage is equal to the expected value of the target 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 calculation of the second frequency regulation capacity corresponding to the frequency regulation ratio of the offshore wind power cluster participating in the grid frequency regulation is 1 according to the first output power includes:

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

[0060] Calculating the 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, including 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 power grid frequency regulation method based on an offshore wind power cluster as described in any one of the above embodiments.

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

[0067] The present invention discloses a power 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 shortage according to the frequency regulation capacity demand of the power grid, the first frequency regulation capacity of the generator set, and the second frequency regulation capacity corresponding to the case where all the offshore wind power clusters participate in the power grid frequency regulation, so as to estimate the probability that the frequency regulation capacity demand cannot be met at present, and quantify the frequency regulation capability of the offshore wind power cluster. The expected value of initial frequency regulation capacity shortage is then compared with the target expected value of frequency regulation capacity shortage corresponding to the frequency regulation capacity demand. When it is determined that 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 the power grid frequency regulation is too high. By adjusting the frequency regulation ratio, the expected value of initial frequency regulation capacity shortage is gradually approached to the target expected value of frequency regulation capacity shortage, and the target frequency regulation capacity of the offshore wind power cluster participating in the 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 short of the 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 It is a flow chart of a method for frequency regulation of a power grid based on an offshore wind power cluster provided in one embodiment of the present invention.

[0069] Figure 2 It is a structural schematic 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 It 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] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are 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 creative work 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 technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0073] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0074] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood 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 the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after 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 clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0078] See also Figure 1 , is a flow chart of a method for frequency modulation 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 demand 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 =α d ×d t +α w ×P w,t ;

[0082] Among them, rd t represents the frequency regulation capacity demand of the power system at time t; α d Indicates the load frequency regulation capacity demand ratio, which is 10%; α w represents the output frequency regulation 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, calculate the first frequency regulation capacity of the generator set participating in the grid frequency regulation:

[0084] RC g =0.1×C g ;

[0085] Among them, RC g Indicates the first frequency regulation capacity of the generator set g; C g Indicates the capacity of the generator set g;

[0086] S2. Calculate, based on the first output power, a corresponding second frequency regulation capacity when the frequency regulation ratio of the offshore wind power cluster participating in the grid frequency regulation is 1;

[0087] Preferably, the calculation, based on the first output power, of the corresponding second frequency regulation capacity when the frequency regulation ratio of the offshore wind power cluster participating in the grid frequency regulation is 1 includes:

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

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

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

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

[0092] S25: If not, determine 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 It indicates the frequency regulation ratio of offshore wind power cluster participating in grid frequency regulation, and its value range is [0,1].

[0096] S3. Calculate an expected value of initial frequency regulation capacity shortage according to the frequency regulation capacity demand, the first frequency regulation capacity, and the second frequency regulation capacity; wherein the expected value of initial frequency regulation capacity shortage is the sum of the product of the situation where the total frequency regulation capacity does not meet the frequency regulation capacity demand and the probability of occurrence when the offshore wind power 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;

[0097] Preferably, calculating the expected value of the initial frequency modulation capacity shortage according to the frequency modulation capacity demand, 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 and calculate 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 set g is online, the frequency regulation capacity of the generator set g is accumulated and the availability rate of the generator set g is accumulated; if the generator set g is offline, the unavailability rate of the generator set g is accumulated. Specifically:

[0102]

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

[0104] S33. Calculate an expected value of initial frequency modulation capacity shortage according to 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, comparing the initial frequency modulation capacity shortage expected value with the target frequency modulation capacity shortage expected value corresponding to the frequency modulation capacity demand;

[0109] Preferably, after comparing the initial frequency modulation capacity shortage expected value with the target frequency modulation capacity shortage expected value 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, the frequency regulation ratio is set to a fixed value, and the target energy storage capacity is iteratively calculated; wherein the target energy storage capacity is the energy storage capacity that needs to be increased by the offshore wind power cluster to just meet the frequency regulation capacity demand when the offshore wind power cluster participates in the 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, according to the initial capacity upper limit and the initial capacity lower limit, repeatedly calculating the energy storage capacity by using a second dichotomy iterative operation until a target frequency regulation capacity is generated;

[0114] The second dichotomy iterative operation includes:

[0115] S4121, obtaining an upper capacity limit and a lower capacity limit; wherein, initially, the upper capacity limit is an initial upper capacity limit, and the lower capacity limit is an 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, calculating a corresponding expected value of a second frequency regulation capacity shortage to be evaluated according to 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 the 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 shortage of frequency regulation capacity to be evaluated is not less than the expected value of the shortage of target frequency regulation capacity, the energy storage capacity to be evaluated is set as the lower limit of the capacity to be evaluated, and a fourth difference between the upper limit of the capacity and the lower limit of the capacity to be evaluated is calculated;

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

[0121] S4127: If yes, then end the second binary division 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 binary division 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 binary division iterative operation.

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

[0125] In a preferred embodiment of the present invention, Figure 3 As shown, according to the frequency modulation capacity demand, the corresponding target frequency modulation capacity shortage expected value is calculated. 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 it is set to 1, it means that the frequency regulation ratio has reached the maximum at this time. That is, when all offshore wind power clusters participate in the grid frequency regulation, if the initial frequency regulation capacity is still insufficient and the expected value is not less than the target frequency regulation capacity, it means that the grid frequency regulation capacity demand cannot be met at present, and it is necessary to plan to increase the energy storage capacity to meet the target.

[0127] Specifically, by using the frequency ratio β w The value is fixed to 1, and the second binary division iteration operation is used to calculate how much energy storage capacity needs to be added to just meet the frequency regulation capacity demand of the power grid. The second binary division iteration operation 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 taken 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 energy storage capacity of wind power cluster with equal reliability is C 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 execute the second binary division iteration operation;

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

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

[0136] S52, repeatedly adjusting the frequency modulation ratio by 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 binary division iterative operation includes:

[0138] S521, obtaining 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, calculating 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, calculating the third frequency regulation capacity of the offshore wind power cluster participating in frequency regulation according to the frequency regulation ratio to be evaluated, and calculating the corresponding first frequency regulation capacity shortage expected value to be evaluated according to the frequency regulation capacity demand, the first frequency regulation capacity, and the third frequency regulation capacity;

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

[0144] S527: If yes, determine that the expected value of the initial frequency modulation capacity shortage is equal to the expected value of the target frequency modulation capacity shortage, end the first binary division 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 expected value of the initial frequency regulation capacity shortage is less than the expected value of the target frequency regulation capacity shortage, 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 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 taken 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 , and obtain the expected value of the first frequency regulation capacity shortage to be evaluated ERCNS 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, the process is terminated and the optimal frequency regulation ratio of wind power cluster with equal reliability is output. If rl>tol, continue to execute the first binary division iteration operation.

[0154] S6. Determine the target frequency regulation capacity of the offshore wind power cluster for participating 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 is based on the optimal frequency regulation ratio of the wind power cluster with equal reliability and the estimation of energy storage capacity, and can correctly evaluate the contribution of the offshore wind power cluster to the system frequency regulation.

[0156] At the planning level, it can support the access, transmission planning and energy storage configuration planning of offshore wind power clusters: based on the system frequency stability requirements, it can carry out wind power cluster capacity planning, optimal frequency regulation ratio configuration and optimal energy storage capacity configuration. At the same time, line reliability also has a significant impact on the credibility of the frequency regulation capacity of offshore wind power clusters. By comparing the credibility of the frequency regulation capacity of offshore wind power clusters under different access points and different transmission corridors, it can assist in making decisions on the access and transmission planning of wind farms.

[0157] At the level of safe operation, it can ensure that offshore wind power clusters provide frequency regulation services, participate in the frequency regulation of the power system 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 power grid frequency regulation method based on an offshore wind power cluster, according to the power grid frequency regulation capacity demand, the first frequency regulation capacity of the generator set, and the corresponding second frequency regulation capacity when all the offshore wind power clusters participate in the power grid frequency regulation, the initial frequency regulation capacity shortage expected value is calculated to estimate the probability that the current frequency regulation capacity demand cannot be met, and the frequency regulation capability of the offshore wind power cluster is quantified, and then the initial frequency regulation capacity shortage expected value is compared with the target frequency regulation capacity shortage expected value corresponding to the frequency regulation capacity demand, and when it is determined that the initial frequency regulation capacity shortage expected value is less than the target frequency regulation capacity shortage expected value, it is determined that the frequency regulation ratio of the offshore wind power cluster participating in the power grid frequency regulation is too high, and the frequency regulation ratio is adjusted so that the initial frequency regulation capacity shortage expected value gradually approaches the target frequency regulation capacity shortage expected value, and the target frequency regulation capacity of the offshore wind power cluster participating in the 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 shortage expected value, so that the target frequency regulation capacity required for the wind power cluster to participate in the frequency regulation under different frequency regulation capacity requirements can be accurately calculated, effectively reducing the difficulty of power grid frequency regulation.

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

[0160] A data acquisition module, 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 frequency regulation of the power grid, and the first output power of the offshore wind power cluster;

[0161] A first calculation module is used to calculate, according to the first output power, a corresponding second frequency regulation capacity when the frequency regulation ratio of the offshore wind power cluster participating in the grid frequency regulation is 1;

[0162] a second calculation module, configured to calculate an expected value of initial frequency regulation capacity shortage according to the frequency regulation capacity demand, the first frequency regulation capacity, and the second frequency regulation capacity; wherein the expected value of initial frequency regulation capacity shortage is the sum of the product of the situation where the total frequency regulation capacity does not meet the frequency regulation capacity demand and the probability of occurrence when the offshore wind power 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;

[0163] A data comparison module, used for comparing the expected value of the initial frequency modulation capacity shortage with the expected value of the target frequency modulation capacity shortage corresponding to the frequency modulation capacity demand;

[0164] a data iteration module, configured to iteratively adjust the frequency modulation ratio when it is determined that the expected value of the initial frequency modulation capacity shortage is less than the expected value of the target frequency modulation capacity shortage, so that the expected value of the initial frequency modulation capacity shortage gradually approaches the expected value of the target frequency modulation capacity shortage, and generate a target frequency modulation ratio when it is determined that the expected value of the initial frequency modulation capacity shortage is equal to the expected value of the target 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 calculation of the second frequency regulation capacity corresponding to the frequency regulation ratio of the offshore wind power cluster participating in the grid frequency regulation is 1 according to the first output power includes:

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

[0168] Calculating the 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, it is determined that the second frequency modulation capacity is 0.

[0172] It should be noted that the device embodiments described above are merely schematic, 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 on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the accompanying 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 may understand and implement it without paying any creative effort.

[0173] Those skilled in the art can 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, 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, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, and uses various interfaces and lines to connect various parts of the entire terminal device.

[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 (F l ash 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, the storage medium is a computer-readable storage medium, the computer program is stored in the computer-readable storage medium, and the computer program, when executed by the processor, 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, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0179] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle 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 cluster, characterized in that: include: Obtaining the frequency regulation capacity demand 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; According to the first output power, calculating a corresponding second frequency regulation capacity when the frequency regulation ratio of the offshore wind power cluster participating in the grid frequency regulation is 1; According to the frequency regulation capacity demand, the first frequency regulation capacity, and the second frequency regulation capacity, an expected value of initial frequency regulation capacity shortage is calculated; wherein the expected value of initial frequency regulation capacity shortage is the sum of the product of the situation where the total frequency regulation capacity does not meet the frequency regulation capacity demand and the probability of occurrence when the offshore wind power 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; 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; When it is determined that the initial frequency modulation capacity shortage expected value is less than the target frequency modulation capacity shortage expected value, iteratively adjust the frequency modulation ratio so that the initial frequency modulation capacity shortage expected value gradually approaches the target frequency modulation capacity shortage expected value, and when it is determined that the initial frequency modulation capacity shortage expected value is equal to the target frequency modulation capacity shortage expected value, generate 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 the grid frequency regulation is determined, and the offshore wind power cluster participates in the 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 as claimed in claim 1, characterized in that: The calculating, according to the first output power, a corresponding second frequency regulation capacity when the frequency regulation ratio of the offshore wind power cluster participating in the grid frequency regulation is 1, includes: 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; Determining whether a proportion of the first output power in 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, it is determined that the second frequency modulation capacity is 0.

3. A method for frequency modulation of a power grid based on an offshore wind power cluster as claimed in claim 2, characterized in that: The calculating, according to the frequency modulation capacity requirement, the first frequency modulation capacity, and the second frequency modulation capacity, an expected value of initial frequency modulation capacity shortage includes: 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; According to the start-stop state combination and the first frequency regulation capacity, calculating the available frequency regulation capacity of the generator set under each start-stop state combination; 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.

4. A method for frequency modulation of a power grid based on an offshore wind power cluster as claimed in claim 3, characterized in that: The iterative adjustment of the frequency modulation ratio so that the initial frequency modulation capacity shortage expected value gradually approaches the target frequency modulation capacity shortage expected value, and when it is determined that the initial frequency modulation capacity shortage expected value is equal to the target frequency modulation capacity shortage expected value, generating a target frequency modulation ratio, comprises: Obtaining a preset initial ratio upper limit, an initial ratio lower limit, and a first adjustment tolerance; According to the initial ratio upper limit and the initial ratio lower limit, the frequency modulation ratio is repeatedly adjusted by using a first dichotomy iterative operation until a target frequency modulation ratio is generated; The first binary division iterative operation includes: Obtaining 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; Calculate the average value of the upper limit of the ratio and the lower limit of the ratio as the frequency modulation ratio to be evaluated; According to the frequency regulation ratio to be evaluated, calculating the third frequency regulation capacity of the offshore wind power cluster participating in the frequency regulation, and according to the frequency regulation capacity demand, the first frequency regulation capacity, and the third frequency regulation capacity, calculating the corresponding first frequency regulation capacity to be evaluated shortage expected value; 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; 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; determining whether the first difference or the second difference is less than the first adjustment tolerance; If yes, it is determined that the expected value of the initial frequency modulation capacity shortage is equal to the expected value of the target frequency modulation capacity shortage, and the first binary division iteration operation is terminated, and the frequency modulation ratio to be evaluated is used as the target frequency modulation ratio; If not, the upper limit of the proportion to be evaluated and the lower limit of the proportion are used as the upper limit of the proportion and the lower limit of the proportion 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.

5. A method for frequency modulation of a power grid based on an offshore wind power cluster as claimed in claim 4, characterized in that: After comparing the initial frequency modulation capacity shortage expected value with the target frequency modulation capacity shortage expected value 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 the target energy storage capacity is iteratively calculated; wherein the target energy storage capacity is the energy storage capacity that needs to be increased by the offshore wind power cluster to just meet the frequency regulation capacity demand when the offshore wind power cluster participates in the grid frequency regulation; An energy storage configuration planning scheme for the offshore wind power cluster is generated according to the target energy storage capacity.

6. A method for frequency modulation of a power grid based on an offshore wind power cluster as claimed in claim 5, 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, the energy storage capacity is repeatedly calculated using a second dichotomy iterative operation until a target frequency regulation capacity is generated; The second dichotomy iterative operation includes: Obtaining an upper capacity limit and a lower capacity limit; wherein, initially, the upper capacity limit is an initial capacity upper limit, and the lower capacity limit is an initial capacity lower limit; Taking the average value of the upper capacity limit and the lower capacity limit as the energy storage capacity to be evaluated; Calculate a corresponding expected value of a second frequency regulation capacity shortage to be evaluated according to 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 the 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 capacity limit and the lower capacity limit to be evaluated; determining whether the third difference or the fourth difference is less than the second adjustment tolerance; If yes, then the second binary division iteration 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 binary division iteration 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 binary division iterative operation.

7. A power grid frequency regulation device based on an offshore wind power cluster, characterized in that: include: A data acquisition module, 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 frequency regulation of the power grid, and the first output power of the offshore wind power cluster; A first calculation module is used to calculate, according to the first output power, a corresponding second frequency regulation capacity when the frequency regulation ratio of the offshore wind power cluster participating in the grid frequency regulation is 1; a second calculation module, configured to calculate an expected value of initial frequency regulation capacity shortage according to the frequency regulation capacity demand, the first frequency regulation capacity, and the second frequency regulation capacity; wherein the expected value of initial frequency regulation capacity shortage is the sum of the product of the situation where the total frequency regulation capacity does not meet the frequency regulation capacity demand and the probability of occurrence when the offshore wind power 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; A data comparison module, used for comparing the expected value of the initial frequency modulation capacity shortage with the expected value of the target frequency modulation capacity shortage corresponding to the frequency modulation capacity demand; a data iteration module, configured to iteratively adjust the frequency modulation ratio when it is determined that the expected value of the initial frequency modulation capacity shortage is less than the expected value of the target frequency modulation capacity shortage, so that the expected value of the initial frequency modulation capacity shortage gradually approaches the expected value of the target frequency modulation capacity shortage, and generate a target frequency modulation ratio when it is determined that the expected value of the initial frequency modulation capacity shortage is equal to the expected value of the target 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.

8. A power grid frequency regulation device based on an offshore wind power cluster as claimed in claim 7, characterized in that: The calculating, according to the first output power, a corresponding second frequency regulation capacity when the frequency regulation ratio of the offshore wind power cluster participating in the grid frequency regulation is 1, includes: 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; Determining whether a proportion of the first output power in 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, it is determined that the second frequency modulation capacity is 0.

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

10. 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 power grid frequency regulation method based on an offshore wind power cluster as described in any one of claims 1 to 6.

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