Offshore wind farm wind speed early warning diffusion control method and system

Abstract

The present application proposes a method and system for controlling wind speed warning diffusion in offshore wind farms, the method comprising: when it is monitored that the inflow wind speed of any wind turbine in the offshore wind farm is greater than the cut-out wind speed, numbering each wind turbine in the offshore wind farm; determining the equivalent inflow wind speed of other wind turbines in the offshore wind farm according to the inflow wind speed of the wind turbine whose inflow wind speed is greater than the cut-out wind speed and the geographical distance between the wind turbine and other wind turbines in the offshore wind farm; determining the wind turbines that need to be shut down in the offshore wind farm according to the equivalent inflow wind speed of other wind turbines in the offshore wind farm; and controlling the shutdown of wind turbines in the offshore wind farm based on the numbers corresponding to the wind turbines that need to be shut down. The technical solution proposed in the present application is centered on the wind turbine whose inflow wind speed is greater than the cut-out wind speed, and radially controls all the peripheral units one by one, so that the units can respond more promptly and reduce the probability of damage to the units.

Description

Technical Field

[0001] The present application relates to the field of unit control, and in particular to a method and system for early warning diffusion control of wind speed in offshore wind farms. Background Art

[0002] Offshore wind farms are characterized by being built at sea, with long distances between wind turbines, large turbine capacity, and generally facing much higher wind speeds than onshore wind farms. Due to the inconvenience of offshore operation and maintenance, offshore wind farms have a lower resistance to damage from ultra-high-speed winds (such as typhoons). Ultra-high-speed winds often cause damage to turbines.

[0003] At present, offshore wind farms usually make plans for unit shutdown protection based on weather forecasts prepared in advance. In addition, if a unit temporarily detects that the inflow wind speed exceeds the cut-out wind speed, an emergency shutdown operation will be performed to prevent the unit from being damaged. However, inaccurate weather forecasts may cause the unit to shut down when it does not need to be shut down, or there will be no shutdown plan when it is necessary; and the method of temporary wind speed detection for each unit sometimes causes the shutdown process to be slower than the unit damage process caused by the wind speed, and ultimately still causes structural damage to some units. Summary of the invention

[0004] The present application provides a method and system for controlling wind speed warning diffusion in an offshore wind farm, so as to at least solve the technical problem that the shutdown process is slower than the damage process of the unit caused by the wind speed by temporarily detecting the wind speed of each unit.

[0005] The first embodiment of the present application provides a method for controlling wind speed early warning diffusion in an offshore wind farm, the method comprising:

[0006] monitoring the inflow wind speed and cut-out wind speed of each wind turbine in the offshore wind farm, and when it is monitored that the inflow wind speed of any wind turbine in the offshore wind farm is greater than the cut-out wind speed, numbering each wind turbine in the offshore wind farm based on the geographical distance between the wind turbine with the inflow wind speed greater than the cut-out wind speed and other wind turbines in the offshore wind farm;

[0007] Determine the equivalent inflow wind speed of other wind turbines in the offshore wind farm according to the inflow wind speed of the wind turbine whose inflow wind speed is greater than the cut-out wind speed and the geographical distance between the wind turbine and other wind turbines in the offshore wind farm;

[0008] Determine the wind turbines that need to be shut down in the offshore wind farm according to the equivalent inflow wind speeds of other wind turbines in the offshore wind farm;

[0009] The wind turbine sets in the offshore wind farm are controlled to be shut down based on the numbers corresponding to the wind turbine sets that need to be shut down.

[0010] Preferably, the numbering of each wind turbine in the offshore wind farm based on the geographical distance between the wind turbine having an inflow wind speed greater than the cut-out wind speed and other wind turbines in the offshore wind farm comprises:

[0011] The wind turbine with an inflow wind speed greater than the cut-out wind speed is numbered 1, and the other wind turbines in the offshore wind farm are sorted from small to large according to their geographical distances to the wind turbine with an inflow wind speed greater than the cut-out wind speed, and are numbered 2-N in sequence;

[0012] Where N is the total number of wind turbines in the offshore wind farm.

[0013] Further, the determining of the equivalent inflow wind speed of other wind turbines in the offshore wind farm according to the inflow wind speed of the wind turbine having an inflow wind speed greater than the cut-out wind speed and the geographical distance between the wind turbine and other wind turbines in the offshore wind farm comprises:

[0014] Obtain the sum of the geographical distances between the wind turbines numbered 2-N and the wind turbine numbered 1 in the offshore wind farm;

[0015] The equivalent inflow wind speeds of other wind turbines in the offshore wind farm are determined according to the sum of the geographical distances.

[0016] Furthermore, the calculation formula for the equivalent inflow wind speed of other wind turbines in the offshore wind farm is as follows:

[0017]

[0018] Where vwindj-eql is the equivalent inflow wind speed of wind turbine numbered j, vwind1 is the inflow wind speed of wind turbine numbered 1, kd is the natural reduction coefficient of wind speed, ∑d is the sum of geographical distances, and dj is the geographical distance between wind turbine numbered j and wind turbine numbered 1.

[0019] Preferably, the method of determining the wind turbines that need to be shut down in the offshore wind farm according to the equivalent inflow wind speeds of other wind turbines in the offshore wind farm includes:

[0020] When the equivalent inflow wind speed of the wind turbine generator set is greater than the cut-out wind speed of the wind turbine generator set, the wind turbine generator set needs to be shut down.

[0021] The second aspect of the present application provides a wind speed early warning diffusion control system for an offshore wind farm, the system comprising:

[0022] A monitoring numbering module is used to monitor the inflow wind speed and cut-out wind speed of each wind turbine in the offshore wind farm. When it is monitored that the inflow wind speed of any wind turbine in the offshore wind farm is greater than the cut-out wind speed, the wind turbines in the offshore wind farm are numbered based on the geographical distance between the wind turbine with the inflow wind speed greater than the cut-out wind speed and other wind turbines in the offshore wind farm;

[0023] A first determination module is used to determine the equivalent inflow wind speed of other wind turbines in the offshore wind farm according to the inflow wind speed of the wind turbine whose inflow wind speed is greater than the cut-out wind speed and the geographical distance between the wind turbine and other wind turbines in the offshore wind farm;

[0024] The second determination module is used to determine the wind turbines that need to be shut down in the offshore wind farm according to the equivalent inflow wind speeds of other wind turbines in the offshore wind farm;

[0025] The control module is used to control the shutdown of the wind turbines in the offshore wind farm based on the numbers corresponding to the wind turbines that need to be shut down.

[0026] Preferably, the numbering of each wind turbine in the offshore wind farm based on the geographical distance between the wind turbine having an inflow wind speed greater than the cut-out wind speed and other wind turbines in the offshore wind farm comprises:

[0027] The wind turbine with an inflow wind speed greater than the cut-out wind speed is numbered 1, and the other wind turbines in the offshore wind farm are sorted from small to large according to their geographical distances to the wind turbine with an inflow wind speed greater than the cut-out wind speed, and are numbered 2-N in sequence;

[0028] Where N is the total number of wind turbines in the offshore wind farm.

[0029] Furthermore, the first determining module includes:

[0030] An acquisition unit, used to acquire the sum of geographical distances between wind turbines numbered 2-N and wind turbine numbered 1 in an offshore wind farm;

[0031] The determination unit is used to determine the equivalent inflow wind speed of other wind turbines in the offshore wind farm according to the sum of the geographical distances.

[0032] Furthermore, the calculation formula for the equivalent inflow wind speed of other wind turbines in the offshore wind farm is as follows:

[0033]

[0034] Where vwindj-eql is the equivalent inflow wind speed of wind turbine numbered j, vwind1 is the inflow wind speed of wind turbine numbered 1, kd is the natural reduction coefficient of wind speed, ∑d is the sum of geographical distances, and dj is the geographical distance between wind turbine numbered j and wind turbine numbered 1.

[0035] Preferably, the second determining module is specifically used for:

[0036] When the equivalent inflow wind speed of the wind turbine generator set is greater than the cut-out wind speed of the wind turbine generator set, the wind turbine generator set needs to be shut down.

[0037] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0038] The present application proposes a method and system for early warning diffusion control of wind speed in an offshore wind farm, wherein the method comprises: monitoring the inflow wind speed and cut-out wind speed of each wind turbine in the offshore wind farm, and when it is monitored that the inflow wind speed of any wind turbine in the offshore wind farm is greater than the cut-out wind speed, numbering each wind turbine in the offshore wind farm based on the geographical distance between the wind turbine with the inflow wind speed greater than the cut-out wind speed and other wind turbines in the offshore wind farm; determining the equivalent inflow wind speed of other wind turbines in the offshore wind farm according to the inflow wind speed of the wind turbine with the inflow wind speed greater than the cut-out wind speed and the geographical distance between the wind turbine and other wind turbines in the offshore wind farm; determining the wind turbine that needs to be shut down in the offshore wind farm according to the equivalent inflow wind speed of other wind turbines in the offshore wind farm; and controlling the shutdown of the wind turbines in the offshore wind farm based on the numbers corresponding to the wind turbines that need to be shut down. The technical solution proposed in the present application is centered on the wind turbine with an inflow wind speed greater than the cut-out wind speed, and radiates out to all peripheral units one by one for unit-by-unit control, which can enable the units to respond more promptly and reduce the probability of unit damage.

[0039] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0041] Figure 1 This is a flow chart of a wind speed early warning diffusion control method for an offshore wind farm provided according to an embodiment of the present application;

[0042] Figure 2 This is a structural diagram of a wind speed early warning diffusion control system for an offshore wind farm provided according to an embodiment of the present application;

[0043] Figure 3 It is a structural diagram of a first determination module provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0044] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0045] The present application proposes a method and system for early warning diffusion control of wind speed in an offshore wind farm, wherein the method comprises: monitoring the inflow wind speed and cut-out wind speed of each wind turbine in the offshore wind farm, and when it is monitored that the inflow wind speed of any wind turbine in the offshore wind farm is greater than the cut-out wind speed, numbering each wind turbine in the offshore wind farm based on the geographical distance between the wind turbine with the inflow wind speed greater than the cut-out wind speed and other wind turbines in the offshore wind farm; determining the equivalent inflow wind speed of other wind turbines in the offshore wind farm according to the inflow wind speed of the wind turbine with the inflow wind speed greater than the cut-out wind speed and the geographical distance between the wind turbine and other wind turbines in the offshore wind farm; determining the wind turbine that needs to be shut down in the offshore wind farm according to the equivalent inflow wind speed of other wind turbines in the offshore wind farm; and controlling the shutdown of the wind turbines in the offshore wind farm based on the numbers corresponding to the wind turbines that need to be shut down. The technical solution proposed in the present application is centered on the wind turbine with an inflow wind speed greater than the cut-out wind speed, and radiates out to all peripheral units one by one for unit-by-unit control, which can enable the units to respond more promptly and reduce the probability of unit damage.

[0046] The following describes the offshore wind farm wind speed warning diffusion control method and system according to the embodiments of the present application with reference to the accompanying drawings.

[0047] Embodiment 1

[0048] Figure 1 Flow chart of a method for wind speed early warning diffusion control of an offshore wind farm provided according to one embodiment of the present application, such as Figure 1 As shown, the method includes:

[0049] Step 1: monitoring the inflow wind speed and cut-out wind speed of each wind turbine in the offshore wind farm. When it is monitored that the inflow wind speed of any wind turbine in the offshore wind farm is greater than the cut-out wind speed, numbering each wind turbine in the offshore wind farm based on the geographical distance between the wind turbine with the inflow wind speed greater than the cut-out wind speed and other wind turbines in the offshore wind farm;

[0050] In the embodiment of the present disclosure, the numbering of each wind turbine in the offshore wind farm based on the geographical distance between the wind turbine whose inflow wind speed is greater than the cut-out wind speed and other wind turbines in the offshore wind farm includes:

[0051] The wind turbine with an inflow wind speed greater than the cut-out wind speed is numbered 1, and the other wind turbines in the offshore wind farm are sorted from small to large according to their geographical distances to the wind turbine with an inflow wind speed greater than the cut-out wind speed, and are numbered 2-N in sequence;

[0052] Where N is the total number of wind turbines in the offshore wind farm.

[0053] Step 2: determining the equivalent inflow wind speed of other wind turbines in the offshore wind farm according to the inflow wind speed of the wind turbine whose inflow wind speed is greater than the cut-out wind speed and the geographical distance between the wind turbine and other wind turbines in the offshore wind farm;

[0054] In the embodiment of the present disclosure, step 2 specifically includes:

[0055] Step 2-1: Obtain the sum of the geographical distances between the wind turbines numbered 2-N and the wind turbine numbered 1 in the offshore wind farm;

[0056] Step 2-2: Determine the equivalent inflow wind speed of other wind turbines in the offshore wind farm according to the sum of the geographical distances.

[0057] The calculation formula for the equivalent inflow wind speed of other wind turbines in the offshore wind farm is as follows:

[0058]

[0059] Where vwindj-eql is the equivalent inflow wind speed of wind turbine numbered j, vwind1 is the inflow wind speed of wind turbine numbered 1, kd is the natural reduction coefficient of wind speed, ∑d is the sum of geographical distances, and dj is the geographical distance between wind turbine numbered j and wind turbine numbered 1.

[0060] Step 3: Determine the wind turbines that need to be shut down in the offshore wind farm according to the equivalent inflow wind speeds of other wind turbines in the offshore wind farm;

[0061] In the embodiment of the present disclosure, step 3 specifically includes:

[0062] When the equivalent inflow wind speed of the wind turbine generator set is greater than the cut-out wind speed of the wind turbine generator set, the wind turbine generator set needs to be shut down.

[0063] The wind turbine generator set whose inflow wind speed is greater than the cut-out wind speed, namely the wind turbine generator set numbered 1, also needs to be shut down.

[0064] Step 4: Control the wind turbines in the offshore wind farm to shut down based on the number corresponding to the wind turbine that needs to be shut down.

[0065] To more clearly illustrate the implementation process of a method for wind speed early warning and diffusion control in an offshore wind farm according to an embodiment of the present application, the following will be described in detail with a specific method embodiment:

[0066] Step 1): There are N wind turbines in the offshore wind farm. The incoming wind speeds vwind1 - vwindN of each wind turbine and the cut-out wind speeds vout1 - voutN of each wind turbine are detected in real time. If for all i = 1 - N, vwindi ≤ vouti, then step 1) is repeated; otherwise, that is, if there is an nth wind turbine with vwindn > voutn, then step 2) is performed.

[0067] Step 2): With the nth wind turbine as the center, all wind turbines are re-numbered. The nth wind turbine is numbered 1, and the remaining N - 1 wind turbines are numbered from small to large in ascending order of the geographical distance from the 1st wind turbine, and are re-numbered as 2 - N (vwind1 - vwindN and vout1 - voutN are also re-ordered accordingly).

[0068] Step 3): Let j = 2;

[0069] Step 4): Calculate the equivalent incoming wind speed of the jth wind turbine.

[0070]

[0071] where dj is the geographical distance between the jth wind turbine and the 1st wind turbine, in km; ∑d is the sum of the geographical distances of the 2 - Nth wind turbines from the 1st wind turbine, in km, kd is the natural reduction coefficient of the wind speed, in m / s / km, and generally takes 0.2 m / s / km.

[0072] If vwindj - eql ≤ voutj, then the jth wind turbine is not shut down; otherwise, the jth wind turbine is controlled to shut down.

[0073] Step 5): Determine whether j < N. If so, let j = j + 1 and return to step 4); otherwise, step 6) is performed.

[0074] Step 6): The calculation is completed, and the numbers of all the shut-down wind turbines among 1 - N are output and controlled.

[0075] In summary, the present embodiment proposes a method for diffuse control of wind speed warning for offshore wind farms. When a unit detects the arrival of overspeed wind, the influence range and direction of wind speed fluctuations are determined. With the unit as the center, all peripheral units are controlled one by one in a radial manner. This allows the unit to respond more promptly and reduces the probability of damage to the unit.

[0076] Embodiment 2

[0077] Figure 2 The structure diagram of a wind speed early warning diffusion control system for an offshore wind farm provided according to one embodiment of the present application is as follows: Figure 2 As shown, the system comprises:

[0078] A monitoring numbering module 100 is used to monitor the inflow wind speed and cut-out wind speed of each wind turbine in the offshore wind farm. When it is monitored that the inflow wind speed of any wind turbine in the offshore wind farm is greater than the cut-out wind speed, the wind turbines in the offshore wind farm are numbered based on the geographical distance between the wind turbine with the inflow wind speed greater than the cut-out wind speed and other wind turbines in the offshore wind farm;

[0079] A first determination module 200 is used to determine the equivalent inflow wind speed of other wind turbines in the offshore wind farm according to the inflow wind speed of the wind turbine whose inflow wind speed is greater than the cut-out wind speed and the geographical distance between the wind turbine and other wind turbines in the offshore wind farm;

[0080] The second determination module 300 is used to determine the wind turbines that need to be shut down in the offshore wind farm according to the equivalent inflow wind speeds of other wind turbines in the offshore wind farm;

[0081] The control module 400 is used to control the shutdown of the wind turbines in the offshore wind farm based on the numbers corresponding to the wind turbines that need to be shut down.

[0082] In the embodiment of the present disclosure, the numbering of each wind turbine in the offshore wind farm based on the geographical distance between the wind turbine whose inflow wind speed is greater than the cut-out wind speed and other wind turbines in the offshore wind farm includes:

[0083] The wind turbine with an inflow wind speed greater than the cut-out wind speed is numbered 1, and the other wind turbines in the offshore wind farm are sorted from small to large according to their geographical distances to the wind turbine with an inflow wind speed greater than the cut-out wind speed, and are numbered 2-N in sequence;

[0084] Where N is the total number of wind turbines in the offshore wind farm.

[0085] In the embodiments of the present disclosure, Figure 3 As shown, the first determination module 200 includes:

[0086] An acquisition unit 201 is used to acquire the sum of geographical distances between wind turbines numbered 2-N and wind turbine numbered 1 in an offshore wind farm;

[0087] The determination unit 202 is configured to determine the equivalent inflow wind speeds of other wind turbines in the offshore wind farm according to the sum of the geographical distances.

[0088] Furthermore, the calculation formula for the equivalent inflow wind speed of other wind turbines in the offshore wind farm is as follows:

[0089]

[0090] Where vwindj-eql is the equivalent inflow wind speed of wind turbine numbered j, vwind1 is the inflow wind speed of wind turbine numbered 1, kd is the natural reduction coefficient of wind speed, ∑d is the sum of geographical distances, and dj is the geographical distance between wind turbine numbered j and wind turbine numbered 1.

[0091] In the embodiment of the present disclosure, the second determining module 300 is specifically used to:

[0092] When the equivalent inflow wind speed of the wind turbine generator set is greater than the cut-out wind speed of the wind turbine generator set, the wind turbine generator set needs to be shut down.

[0093] In summary, the embodiment proposes an offshore wind farm wind speed warning diffusion control system. When a unit detects the arrival of overspeed wind, it determines the impact range and direction of the wind speed fluctuation, and controls all the peripheral units one by one in a radial manner with the unit as the center. This can enable the unit to respond more promptly and reduce the probability of unit damage.

[0094] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0095] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0096] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A wind speed early warning diffusion control method for an offshore wind farm, characterized in that: The method comprises: monitoring the inflow wind speed and cut-out wind speed of each wind turbine in the offshore wind farm, and when it is monitored that the inflow wind speed of any wind turbine in the offshore wind farm is greater than the cut-out wind speed, numbering each wind turbine in the offshore wind farm based on the geographical distance between the wind turbine with the inflow wind speed greater than the cut-out wind speed and other wind turbines in the offshore wind farm; Determine the equivalent inflow wind speed of other wind turbines in the offshore wind farm according to the inflow wind speed of the wind turbine whose inflow wind speed is greater than the cut-out wind speed and the geographical distance between the wind turbine and other wind turbines in the offshore wind farm; Determine the wind turbines that need to be shut down in the offshore wind farm according to the equivalent inflow wind speeds of other wind turbines in the offshore wind farm; Controlling the shutdown of wind turbines in the offshore wind farm based on the numbers corresponding to the wind turbines that need to be shut down; The method of determining the equivalent inflow wind speed of other wind turbines in the offshore wind farm according to the inflow wind speed of the wind turbine having an inflow wind speed greater than the cut-out wind speed and the geographical distance between the wind turbine and other wind turbines in the offshore wind farm comprises: Obtain the sum of the geographical distances between the wind turbines numbered 2-N and the wind turbine numbered 1 in the offshore wind farm; determining the equivalent inflow wind speed of other wind turbines in the offshore wind farm according to the sum of the geographical distances; The calculation formula for the equivalent inflow wind speed of other wind turbines in the offshore wind farm is as follows: Where, vwindj-eql is the equivalent inflow wind speed of wind turbine numbered j, vwind1 is the inflow wind speed of wind turbine numbered 1, kd is the natural reduction coefficient of wind speed, ∑d is the sum of geographical distances, and dj is the geographical distance between wind turbine numbered j and wind turbine numbered 1; The step of numbering each wind turbine in the offshore wind farm based on the geographical distance between the wind turbine having an inflow wind speed greater than the cut-out wind speed and other wind turbines in the offshore wind farm comprises: The wind turbine with an inflow wind speed greater than the cut-out wind speed is numbered 1, and the other wind turbines in the offshore wind farm are sorted from small to large according to their geographical distances to the wind turbine with an inflow wind speed greater than the cut-out wind speed, and are numbered 2-N in sequence; Where N is the total number of wind turbines in the offshore wind farm.

2. The method according to claim 1, characterized in that The method of determining the wind turbines that need to be shut down in the offshore wind farm according to the equivalent inflow wind speeds of other wind turbines in the offshore wind farm comprises: When the equivalent inflow wind speed of the wind turbine generator set is greater than the cut-out wind speed of the wind turbine generator set, the wind turbine generator set needs to be shut down.

3. An offshore wind farm wind speed early warning diffusion control system, characterized in that: The system comprises: A monitoring numbering module is used to monitor the inflow wind speed and cut-out wind speed of each wind turbine in the offshore wind farm. When it is monitored that the inflow wind speed of any wind turbine in the offshore wind farm is greater than the cut-out wind speed, the wind turbines in the offshore wind farm are numbered based on the geographical distance between the wind turbine with the inflow wind speed greater than the cut-out wind speed and other wind turbines in the offshore wind farm; A first determination module is used to determine the equivalent inflow wind speed of other wind turbines in the offshore wind farm according to the inflow wind speed of the wind turbine whose inflow wind speed is greater than the cut-out wind speed and the geographical distance between the wind turbine and other wind turbines in the offshore wind farm; The second determination module is used to determine the wind turbines that need to be shut down in the offshore wind farm according to the equivalent inflow wind speeds of other wind turbines in the offshore wind farm; A control module, used for controlling the shutdown of wind turbines in the offshore wind farm based on the numbers corresponding to the wind turbines that need to be shut down; The first determining module includes: An acquisition unit, used to acquire the sum of geographical distances between wind turbines numbered 2-N and wind turbine numbered 1 in an offshore wind farm; a determination unit, configured to determine the equivalent inflow wind speeds of other wind turbines in the offshore wind farm according to the sum of the geographical distances; The calculation formula for the equivalent inflow wind speed of other wind turbines in the offshore wind farm is as follows: Where, vwindj-eql is the equivalent inflow wind speed of wind turbine numbered j, vwind1 is the inflow wind speed of wind turbine numbered 1, kd is the natural reduction coefficient of wind speed, ∑d is the sum of geographical distances, and dj is the geographical distance between wind turbine numbered j and wind turbine numbered 1; The step of numbering each wind turbine in the offshore wind farm based on the geographical distance between the wind turbine having an inflow wind speed greater than the cut-out wind speed and other wind turbines in the offshore wind farm comprises: The wind turbine with an inflow wind speed greater than the cut-out wind speed is numbered 1, and the other wind turbines in the offshore wind farm are sorted from small to large according to their geographical distances to the wind turbine with an inflow wind speed greater than the cut-out wind speed, and are numbered 2-N in sequence; Where N is the total number of wind turbines in the offshore wind farm.

4. The system according to claim 3, characterized in that The second determining module is specifically used for: When the equivalent inflow wind speed of the wind turbine generator set is greater than the cut-out wind speed of the wind turbine generator set, the wind turbine generator set needs to be shut down.

Images