Offshore wind turbine generator anti-typhoon standby power supply capacity configuration calculation method

Abstract

The invention discloses a capacity configuration calculation method for a typhoon-resistant standby power supply of an offshore wind turbine generator, which is suitable for evaluating the capacity of the typhoon-resistant standby power supply in a typhoon-prone sea area, and the wind speed change of a site under the influence of each typhoon is obtained through the maximum wind speed simulation of the site of a wind power plant under the influence of typhoons over the years. And the wind speed time sequence of the site fan is obtained by calculating the height and wind speed of the fan hub. And calculating the fan cut-out duration under the influence of the typhoon according to the speed time sequence under the influence of each typhoon to obtain the fan cut-out duration under the influence of each typhoon. And calculating the standby power supply configuration capacity according to the maximum cut-out duration. According to the calculation method, typhoon wind speed simulation, fan hub height wind speed and fan cut-out duration calculation are combined, the quantitative evaluation method for typhoon-resistant standby power supply configuration duration is obtained, the blank of an existing typhoon-resistant standby power supply capacity configuration method is filled up, the calculation result can provide reference for standby power supply configuration capacity, and the method is suitable for popularization and application. Technical support is provided for wind power plant construction in sea areas strongly affected by typhoons.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a method for calculating the configuration of typhoon-resistant standby power supply capacity for an offshore wind turbine. Background Art

[0002] The northwest Pacific is a high-incidence area for typhoons. The southeastern and southern coastal areas of my country are affected by typhoons all year round, posing a serious threat to the development of wind farms. Take the super typhoon "Makar" on September 6, 2024 as an example. During its landing in Wenchang, Hainan, a large number of units in a wind farm collapsed and blades broke. One of the main reasons for the damage to the wind turbines at this station is that the units were not powered on, and they could not yaw to actively face the wind and reduce the load of the units when the typhoon passed. From the perspective of the typhoon resistance of each host manufacturer, the most important design for offshore wind turbines to resist typhoons is to set up a backup power supply to complete the active yaw facing the wind in the event of a power failure. The backup power supply can be in the form of a diesel generator + energy storage battery. However, the capacity configuration of backup power supplies among various host manufacturers is very different. For developers, there is a lack of a quantitative evaluation method, resulting in over- or under-allocation of backup power supplies. Summary of the invention

[0003] In view of the lack of quantitative evaluation methods for the existing configuration of typhoon-resistant backup power supply capacity for wind turbines, the present invention proposes a method for calculating the configuration of typhoon-resistant backup power supply capacity for offshore wind turbines. The technical scheme is as follows: (1) constructing a typhoon sequence screening model, and screening and obtaining a typhoon sequence by analyzing the impact of typhoons on the sites where wind farms are located in history; (2) constructing a typhoon wind field model, and calculating the wind speed time series of the target site under the influence of each typhoon to obtain a set of wind speed time series for the target site; (3) constructing a wind turbine wind speed model, and converting the obtained wind speed time series of each target site into the wind speed time series of the wind turbine to be used in the wind farm, and obtaining a set of wind speed time series for the wind turbine at the target site; (4) constructing a wind turbine cut-out duration model, and obtaining a cut-out duration data set of the unit under the influence of each typhoon; (5) comparing the cut-out duration under the influence of each typhoon to determine the typhoon-resistant backup power supply configuration duration; (6) determining the typhoon-resistant backup power supply configuration capacity according to the typhoon-resistant backup power supply configuration duration requirements.

[0004] Further, step 1) assumes the center of the wind farm site is O 1 , assuming that the center of a typhoon is located at O 2 , O 1 O 2 The distance between them is recorded as r; assuming that the typhoon impact radius is R 0 , calculate the r value during the typhoon's entire path, and record R=(r 1 、r 2 ……r k );Let the maximum value in R be r max , compare rmax With R 0 The size of all r max >R typhoons are included in the typhoon sequence TP, denoted by TP=(tp 1 ,tp 2 ...tp n ), containing a total of n typhoons.

[0005] Furthermore, in step 2), the parameterized model Holland is used to calculate the wind farm site center O according to data such as r, typhoon center pressure, and typhoon maximum wind speed. 1 The wind speed time series W during the movement of a typhoon i i , W i =(w i1 ,w i2 ...w ik ), according to the typhoon sequence TP, the target site wind speed time series set TPW=(W 1 ,W 2 ...W n ).

[0006] Furthermore, in step 3), the average wind speed is first converted into the gust wind speed, and the gust coefficient is recorded as k g , multiply the target site wind speed time series set obtained from meteorological data by the gust coefficient to obtain the target site maximum gust time series set TPW g =(W g1 ,W g2 ...W gn ), where W gi =(w gi1 ,w gi2 ...w gik ), and then the maximum gust time series set TPW g Converted into the gust wind speed at the hub height of the wind turbine used in the wind farm, the gust wind speed sequence at the hub height is recorded as V, the hub height is h, and the wind shear index is α. , thus we get the target site wind turbine gust wind speed time series set TPV = (V 1 ,V 2 ……V n ); Using the same method, obtain the 10-minute average wind speed time series set TPU of the target site wind turbine, and record the 10-minute average wind speed conversion coefficient as k m , the target site wind speed time series set obtained from meteorological data is compared with k m Multiply them together to get the 10-minute average wind speed time series set TPW of the target site. m =(W m1 ,W g2 ...W gn ), where Wmi =(w mi1 ,w mi2 ...w mik ), and then the 10-min average wind speed time series set TPW m Converted into the 10-minute average wind speed at the hub height of the wind turbine used in the wind farm, the 10-minute average wind speed sequence at the hub height is recorded as U, the hub height is h, and the wind shear index is α. , thus we get the 10-minute average wind speed time series set TPU=(U 1 ,U 2 ...U n ).

[0007] Furthermore, the step 4) considers both gust cut-out and average wind speed cut-out, and the gust cut-out setting value is v gco , the average wind speed cut-out setting value is v mco , each wind speed sequence V in TPV i The wind speed value and the setting value V in the gust cut-out gco For comparison, V 1 =(v 11 ,v 12 ……v 1n ) as an example, find the first wind speed value greater than v gco The value of v 1a , let a be the first time point when the wind turbine gust is shut down, find the last wind speed value greater than v gco The value of v 1c , c is the last time point when the wind turbine gust is shut down; the wind speed sequences U in TPU i The wind speed value and the set value v in the average wind speed cut-out mco For comparison, U 1 =(u 11 ,u 12 ……u 1n ) as an example, find the first wind speed value greater than v mco The value of u 1b , let b be the first time point when the fan average wind speed is shut down and cut out, find the last wind speed value greater than v mco The value of v 1d , d is the last time point when the fan is shut down at the average wind speed; the data time interval is t 0 , wind turbine cut-out time t i =[max(c,d)-min(a,b)]*t 0 ; Calculate the cut-out time of each typhoon and obtain the cut-out time dataset T=(t 1 ,t 2 ……t n).

[0008] Furthermore, in step 5), the maximum value in the data set is found according to the cut-out duration data set, which is recorded as t c , t c This is the reference duration for the typhoon-resistant backup power supply configuration.

[0009] Furthermore, the step 6) is specifically as follows: according to the equivalent power of the backup power supply object of the wind turbine during the typhoon resistance period, the capacity C of the typhoon resistance backup power supply is calculated. The power supply objects include the yaw motor, the control cabinet, the pitch locking mechanism, and the auxiliary system. The equivalent power is the power equivalent value of the unit when it is running in the typhoon resistance mode rather than the rated value. C=(P 偏航 +P 控制 +P 变桨锁定 +P 辅助 +…)*t C .

[0010] The design ideas of the present invention are as follows: The present invention is suitable for the assessment of the capacity of typhoon-resistant backup power supplies in sea areas prone to typhoons. By simulating the maximum wind speed of the wind farm site under the influence of typhoons in previous years, the wind speed change of the site under the influence of each typhoon is obtained. By calculating the wind speed at the hub height of the wind turbine, the wind speed time series of the site wind turbine is obtained. According to the wind speed time series under the influence of each typhoon, the wind turbine cut-out duration under the influence of the typhoon is calculated to obtain the wind turbine cut-out duration under the influence of each typhoon. According to the maximum cut-out duration, the backup power supply configuration capacity is calculated. This calculation method combines typhoon wind speed simulation, wind speed at the hub height of the wind turbine and calculation of wind turbine cut-out duration to obtain a quantitative evaluation method for the configuration duration of the typhoon-resistant backup power supply, filling the gap in the current typhoon-resistant backup power supply capacity configuration method. The calculation results can provide a reference for the backup power supply configuration capacity and provide technical support for the construction of wind farms in sea areas strongly affected by typhoons.

[0011] The beneficial effects of the present invention are as follows: At present, the configuration capacity of typhoon-resistant backup power supplies for offshore wind turbines relies on experience, which may result in insufficient or excessive capacity configuration, leading to increased project maintenance costs or investment costs. The present invention provides a method for evaluating the configuration capacity of backup power supplies based on typhoon duration, which can quantify the capacity configuration strategy and provide a scientific basis for the configuration of backup power supplies in the construction of offshore wind power projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention is a flow chart of the method. DETAILED DESCRIPTION

[0013] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0014] In order to achieve the above-mentioned object, the present invention provides a method for calculating the configuration of typhoon-resistant backup power supply capacity of an offshore wind turbine. The calculation process is as follows: Figure 1 As shown, the specific execution process is as follows: Get a typhoon data set. The data set is the typhoon meteorological data of previous years. The meteorological data should include but not be limited to the typhoon longitude coordinates, latitude coordinates, central air pressure, maximum wind speed, etc. Generally speaking, the maximum wind speed of a typhoon given by the Meteorological Bureau is the average wind speed at a height of 10m for 2 minutes. The data is preferably hourly in time scale. Table 1 below is the 2006 Saomai typhoon meteorological data set; Table 1 ; Construct a typhoon sequence screening model, assuming the center of the wind farm site is O 1 , assuming the typhoon center is O 2 , O 1 O 2 The distance between them is recorded as r. Assume that the typhoon impact radius is R 0 (Considering the relationship between the typhoon wind circle and intensity, 300 km can be selected). Calculate the r value during the entire typhoon path, and record R=(r 1 、r 2 ……r k ). Let the maximum value in R be r max , compare r max With R 0 The size of all r max >R typhoons are included in the typhoon sequence TP, denoted by TP=(tp 1 ,tp 2 ...tp n ), containing a total of n typhoons.

[0015] Construct a typhoon wind field model. The model can adopt a parameterized model such as the Holland model. According to data such as r, typhoon center pressure, and typhoon maximum wind speed, the center O of the wind farm site can be calculated. 1 The wind speed time series W during the movement of typhoon i i , W i =(w i1 ,w i2 ...w ik ), according to the typhoon sequence TP, the target site wind speed time series set TPW=(W 1 ,W 2 ...W n ). The time series is hourly wind speed, and linear interpolation is used for the original data input; Table 2 is the wind speed time series of the typhoon; Table 2 ; To build a wind turbine wind speed model, first convert the average wind speed into gust wind speed, and record the gust coefficient as k g , multiply the target site wind speed time series set obtained from meteorological data by the gust coefficient to obtain the target site maximum gust time series set TPW g =(W g1 ,W g2 ...W gn ), where W gi =(w gi1 ,w gi2 ...w gik ), and then the maximum gust time series set TPW g Converted into the gust wind speed at the hub height of the wind turbine used in the wind farm, the gust wind speed sequence at the hub height is recorded as V, the hub height is h, and the wind shear index is α. , thus we can get the target site wind turbine gust wind speed time series set TPV = (V 1 ,V 2 ……V n ). Using the same method, the 10-minute average wind speed time series set TPU of the target site wind turbine is obtained, and the 10-minute average wind speed conversion coefficient is denoted as k m , the target site wind speed time series set obtained from meteorological data is compared with k m Divide them to get the 10-minute average wind speed time series set TPW of the target site m =(W m1 ,W g2 ...W gn ), where W mi =(w mi1 ,w mi2 ...w mik ), and then the 10-min average wind speed time series set TPW m The 10-minute average wind speed at the hub height of the wind turbine used in the wind farm is converted into the 10-minute average wind speed at the hub height. The 10-minute average wind speed sequence at the hub height is recorded as U, the hub height is h, and the wind shear index is α. Thus, the 10-minute average wind speed time series set TPU of the wind turbine at the target site can be obtained: 1 ,U 2 ...U n ) (In the embodiment, k is taken according to the offshore conditions of the target area and with reference to the recommended value of the international tropical cyclone gust coefficient g =1.28, take k m =1.38, hub height is 150m, shear index is 0.09); The time series of gust wind speed at the hub height of the typhoon is shown in Table 3. Table 3 ; The 10-minute average wind speed time series at hub height is shown in Table 4: Table 4 ; To construct a wind turbine cut-out duration model, combined with the high turbulence meteorological characteristics of typhoons and the current wind turbine cut-out logic, it is necessary to consider both gust cut-out and average wind speed cut-out. The gust cut-out setting value is v gco , the average wind speed cut-out setting value is v mco . The wind speed sequence V in TPV i The wind speed value and the setting value V in the gust cut-out gco For comparison, V 1 =(v 11 ,v 12 ……v 1n ) as an example, find the first wind speed value greater than v gco The value of v 1a , let a be the first time point when the wind turbine gust is shut down, find the last wind speed value greater than v gco The value of v 1c , c is the last time point when the wind turbine gust is shut down. i The wind speed value and the set value v in the average wind speed cut-out mco For comparison, U 1 =(u 11 ,u 12 ……u 1n ) as an example, find the first wind speed value greater than v mco The value of u 1b , let b be the first time point when the fan average wind speed is shut down and cut out, find the last wind speed value greater than v mco The value of v 1d , d is the last time point when the fan is shut down at the average wind speed. The data time interval is t 0 , wind turbine cut-out time t i =[max(c,d)-min(a,b)]*t 0 . The cut-out time of each typhoon is calculated to obtain the cut-out time dataset T=(t 1 ,t 2 ……t n ).

[0016] Take the typhoon as an example. The wind speed sequence time interval is 1 hour. Assume that the gust cut-out wind speed is 35 m / s, the average wind speed cut-out is 25 m / s, the first gust cut-out time point is 2006 / 8 / 9 22:00, the first average wind speed cut-out time point is also 2006 / 8 / 9 22:00, the last gust cut-out time point is 2006 / 8 / 10 16:00, the first average wind speed cut-out time point is 2006 / 8 / 10 15:00, the cut-out time length of the typhoon is [max(131,130)-min(113,113)]*1=18 hours. At present, there is little research on the capacity configuration of typhoon-resistant backup power supplies in the offshore wind power industry. The maximum working time of the backup power supply is basically determined in days, and there is a lack of refined calculations and more accurate quantitative evaluation methods. The present invention provides a method for calculating the gust wind speed and average wind speed at the hub height of the wind turbine at the target site in combination with historical typhoon data, and determines the maximum working time of the backup power supply by combining the calculated wind speed value under the influence of the typhoon and the logical relationship of the wind turbine control, thereby providing support for the accurate and quantitative calculation of the backup power supply capacity.

[0017] Each typhoon has a corresponding cut-out duration. According to the cut-out duration data set, find the maximum value in the data set, which is recorded as t c , t c This is the reference duration for typhoon-resistant backup power supply configuration.

[0018] The capacity C of the typhoon-resistant backup power supply is calculated based on the equivalent power of the backup power supply object of the wind turbine during the typhoon-resistant period. The power supply objects generally include the yaw motor, control cabinet, pitch locking mechanism, auxiliary system, etc. The equivalent power is the power equivalent value of the unit when it is running in the typhoon-resistant mode rather than the rated value. C=(P 偏航 +P 控制 +P 变桨锁定 +P 辅助 +…)*t C .

[0019] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for calculating the configuration of typhoon-resistant backup power supply capacity for offshore wind turbines, characterized in that: The steps include: Step 1) Construct a typhoon sequence screening model, and screen and obtain the typhoon sequence by analyzing the historical typhoon impacts on the sites where the wind farms are located; Step 2) construct a typhoon wind field model, calculate the wind speed time series of the target site under the influence of each typhoon, and obtain the wind speed time series set of the target site; Step 3) construct a wind turbine wind speed model, convert the wind speed time series of each target site into the wind turbine wind speed time series to be used in the wind farm, and obtain the wind turbine wind speed time series set of the target site; Step 4) construct a wind turbine cut-out duration model and obtain a cut-out duration dataset of the turbines under the influence of various typhoons; Step 5) Compare the cut-out duration under the influence of various typhoons and determine the configuration duration of the typhoon-resistant backup power supply; Step 6) Determine the configuration capacity of the typhoon-resistant backup power supply based on the configuration duration requirements of the typhoon-resistant backup power supply.

2. A method for calculating the configuration of typhoon-resistant backup power supply capacity for offshore wind turbines according to claim 1, characterized in that: The specific process of step 1) is as follows: Assume that the center of the wind farm site is O1, the center of a typhoon is O2, and the distance between O1 and O2 is r; Assume that the typhoon impact radius is R0, calculate the r value during the entire typhoon path, and record R=(r1, r2…r k );Let the maximum value in R be r max , compare r max With the size of R0, all r max >R typhoons are included in the typhoon sequence TP, TP=(tp1, tp2…tp n ), containing a total of n typhoons.

3. The method for calculating the configuration of the typhoon-resistant backup power supply capacity of an offshore wind turbine according to claim 1, characterized in that: The specific process of step 2) is as follows: The parameterized model Holland is used to calculate the wind speed time series W of the wind farm site center O1 during the movement of a typhoon i according to r, the typhoon center pressure, and the typhoon maximum wind speed. i , W i =(w i1 ,w i2 ...w ik ), according to the typhoon sequence TP, the target site wind speed time series set TPW=(W1,W2……W n ).

4. The method for calculating the configuration of the typhoon-resistant backup power supply capacity of an offshore wind turbine according to claim 1, characterized in that: The specific process of step 3) is as follows: The 2-minute average wind speed is calculated based on the wind field model. The average wind speed needs to be converted into gust wind speed, and the gust coefficient is k. g , multiply the target site wind speed time series set obtained from meteorological data by the gust coefficient to obtain the target site maximum gust time series set TPW g =(W g1 ,W g2 ...W gn ), where W gi =(w gi1 ,w gi2 ...w gik ), and then the maximum gust time series set TPW g Converted into the gust wind speed at the hub height of the wind turbine used in the wind farm, the gust wind speed sequence at the hub height is recorded as V, the hub height is h, and the wind shear index is α. , thus we get the target site wind turbine gust wind speed time series set TPV = (V1, V2 ... V n ); The same method is used to obtain the 10-minute average wind speed of the wind turbine at the target site, and the conversion coefficient of the 10-minute average wind speed is k. m , the target site wind speed time series set obtained from meteorological data is compared with k m Multiply them together to get the 10-minute average wind speed time series set TPW of the target site. m =(W m1 ,W g2 ...W gn ), where W mi =(w mi1 ,w mi2 ...w mik ), and then the 10-min average wind speed time series set TPW m Converted into the 10-minute average wind speed at the hub height of the wind turbine used in the wind farm, the 10-minute average wind speed sequence at the hub height is recorded as U, the hub height is h, and the wind shear index is α. , thus we can get the 10-minute average wind speed time series set TPU=(U1,U2…U n ).

5. The method for calculating the configuration of the typhoon-resistant backup power supply capacity of an offshore wind turbine according to claim 1, characterized in that: The specific process of step 4) is as follows: Considering both gust cut-out and average wind speed cut-out, the gust cut-out setting value is v gco , the average wind speed cut-out setting value is v mco , each wind speed sequence V in TPV i The wind speed value and the setting value V in the gust cut-out gco For comparison, V1=(v 11 ,v 12 ……v 1n ) as an example, find the first wind speed value greater than v gco The value of v 1a , let a be the first time point when the wind turbine gust is shut down, find the last wind speed value greater than v gco The value of v 1c , c is the last time point when the wind turbine gust is shut down; the wind speed sequences U in TPU i The wind speed value and the set value v in the average wind speed cut-out mco For comparison, U1=(u 11 ,u 12 ……u 1n ) as an example, find the first wind speed value greater than v mco The value of u 1b , let b be the first time point when the fan average wind speed is shut down and cut out, find the last wind speed value greater than v mco The value of v 1d , d is the last time point when the wind turbine is shut down and cut out at the average wind speed; the data time interval is t0, and the wind turbine cut-out time is t i =[max(c,d)-min(a,b)]*t0; Calculate the cut-out time of each typhoon and get the cut-out time dataset T=(t1,t2……t n ).

6. The method for calculating the configuration of the typhoon-resistant backup power supply capacity of an offshore wind turbine according to claim 1, characterized in that: The step 5) is specifically as follows: according to the cut-out duration data set, find the maximum value in the data set, recorded as t c , t c This is the reference duration for typhoon-resistant backup power supply configuration.

7. The method for calculating the configuration of the typhoon-resistant backup power supply capacity of an offshore wind turbine according to claim 1, characterized in that: The step 6) is specifically as follows: according to the equivalent power of the backup power supply object of the wind turbine during the typhoon resistance period, the capacity C of the typhoon resistance backup power supply is calculated. The power supply objects include the yaw motor, the control cabinet, the pitch locking mechanism, and the auxiliary system. The equivalent power is the power equivalent value of the unit when it is running in the typhoon resistance mode instead of the rated value. C=(P 偏航 +P 控制 +P 变桨锁定 +P 辅助 +…)*t C .

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