A method and device for determining the power generation of a wind turbine

Abstract

The present invention relates to a method and device for determining the power generation of a wind turbine, including: determining the equivalent wind turbine blade speed of the wind turbine to be measured during a measurement period according to the equivalent nacelle wind speed of the wind turbine to be measured during the measurement period; determining the power generation of the wind turbine to be measured during the measurement period according to the equivalent wind turbine blade speed of the wind turbine to be measured during the measurement period; the present invention obtains the equivalent wind turbine blade speed through the equivalent nacelle wind speed of the wind turbine to be measured, and then obtains the power generation of the wind turbine to be measured according to the equivalent wind turbine blade speed, improving the accuracy of the power generation of the wind turbine.

Description

Technical Field

[0001] The present invention relates to the field of new energy technologies, and particularly to a method and device for determining the power generation of a wind turbine. Background Art

[0002] To cope with the energy crisis and environmental pollution problems, renewable energy has received increasing attention. Among them, wind power generation has become one of the most rapidly developing and promising new energy technologies due to its high utilization rate and mature technology. The wind wheel speed and power generation of wind turbines in a wind farm directly affect the power generation of the wind turbines and also pose a huge challenge to the operation of the power grid. Therefore, being able to accurately and efficiently determine the wind wheel speed and power generation of a wind turbine can obtain the power generation of the wind turbine to ensure the safety of the power grid, and it is also an essential link in the type certification of wind turbines.

[0003] In the prior art, when determining the wind wheel speed of a wind turbine, due to the harsh site requirements, high costs, and long test evaluation time for configuring a wind measurement tower in the test, the nacelle wind speed of the wind turbine is usually used to replace the free flow wind speed at the hub of the wind turbine, resulting in extremely low accuracy and inaccurate determination of the power generation of the wind turbine. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to obtain the equivalent wind wheel speed of a to-be-tested wind turbine through the equivalent nacelle wind speed of the to-be-tested wind turbine, and then obtain the power generation of the to-be-tested wind turbine according to the equivalent wind wheel speed, thereby improving the accuracy of the power generation of the wind turbine.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] The present invention provides a method for determining the power generation of a wind turbine, which is improved in that the method includes:

[0007] Determine the equivalent wind wheel speed of the to-be-tested wind turbine within a measurement period according to the equivalent nacelle wind speed of the to-be-tested wind turbine within the measurement period;

[0008] Determine the power generation of the to-be-tested wind turbine within the measurement period according to the equivalent wind wheel speed of the to-be-tested wind turbine within the measurement period.

[0009] Preferably, the determining the equivalent wind wheel speed of the to-be-tested wind turbine within a measurement period according to the equivalent nacelle wind speed of the to-be-tested wind turbine within the measurement period includes:

[0010] Determine the equivalent wind wheel speed v' of the to-be-tested wind turbine in the m-th sampling period according to the following formula eq,m :

[0011] v' eq,m = s i (m)v'nac,m +o i (m)

[0012] Wherein, v' nac,m is the equivalent nacelle wind speed of the wind turbine to be measured in the m-th sampling period, s i (m) is the first-order coefficient of the bin interval i to which the equivalent wind turbine speed or equivalent nacelle wind speed of the standard wind turbine in the m-th sampling period belongs, o i (m) is the intercept of the bin interval i to which the wind turbine speed or nacelle wind speed of the standard wind turbine in the m-th sampling period belongs, m ∈ N, and N is the total number of sampling periods within the measurement period.

[0013] Furthermore, when the equivalent wind turbine speed of the standard wind turbine in the current sampling period is less than the rated wind turbine speed, the equivalent wind turbine speed data of the sampling periods before the current sampling period of the standard wind turbine are divided into bin intervals at an interval of 0.5 r / min, and the first-order coefficient s i (m) and intercept o i (m) of the bin interval i to which the wind turbine speed of the standard wind turbine in the m-th sampling period belongs are determined by the following formula:

[0014]

[0015] o i (m) = v eq,i - s i (m)v nac,i

[0016] Wherein, v eq,i is the mean value of the equivalent wind turbine nacelle wind speed of the standard wind turbine corresponding to the sampling period containing the equivalent wind turbine speed in the bin interval i, v eq,i+1 is the mean value of the equivalent wind turbine nacelle wind speed of the standard wind turbine corresponding to the sampling period containing the equivalent wind turbine speed in the bin interval i + 1, v nac,i is the mean value of the equivalent nacelle wind speed of the standard wind turbine corresponding to the sampling period containing the equivalent wind turbine speed in the bin interval i, v nac,i+1 is the mean value of the equivalent nacelle wind speed of the standard wind turbine corresponding to the sampling period containing the equivalent wind turbine speed in the bin interval i + 1;

[0017] When the equivalent wind turbine speed of the standard wind turbine in the current sampling period is equal to the rated wind turbine speed, the equivalent nacelle wind speed data of the current sampling period and the sampling periods after the current sampling period of the standard wind turbine are divided into bin intervals at an interval of 0.5 m / s, and the first-order coefficient s i(m) and intercept o i (m).

[0018] Further, the mean value v of the equivalent wind turbine wind speed of the standard wind turbine corresponding to the sampling period included in the bin interval i is determined according to the following formula eq,i and the mean value v of the equivalent nacelle wind speed of the standard wind turbine corresponding to the sampling period included in the bin interval i nac,i :

[0019]

[0020]

[0021] In the formula, v eq,i,j is the equivalent wind turbine wind speed of the standard wind turbine corresponding to the sampling period corresponding to the jth equivalent wind turbine speed in the bin interval i, v nac,i,j is the equivalent nacelle wind speed of the standard wind turbine corresponding to the sampling period corresponding to the jth equivalent wind turbine speed in the bin interval i, N i is the number of equivalent wind turbine speeds included in the bin interval i, j ∈ [0, N i ;

[0022] Further, the equivalent wind turbine wind speed v of the standard wind turbine corresponding to the sampling period corresponding to the jth equivalent wind turbine speed in the bin interval i is determined according to the following formula eq,i,j :

[0023]

[0024] In the formula, v h is the average free stream wind speed of the standard wind turbine in the hth measurement height section, A h is the measurement area of the hth measurement height section, A is the swept area of the wind turbine of the standard wind turbine, n is the total number of measurement height sections, ρ j is the average air density of the sampling period corresponding to the jth equivalent wind turbine speed in the bin interval i, ρ is the standard air density.

[0025] Further, the measurement area A of the hth measurement height section is determined according to the following formula h :

[0026]

[0027] In the formula, D is the diameter of the wind turbine of the standard wind turbine, H is the hub height of the wind turbine of the standard wind turbine, Z is the hth measurement height section.

[0028] Preferably, determining the power generation amount of the wind turbine to be measured during the measurement period according to the equivalent wind turbine blade speed of the wind turbine to be measured during the measurement period includes:

[0029] Determine the power generation amount AEP of the wind turbine to be measured during the measurement period according to the following formula:

[0030]

[0031] In the formula, v ave is the average wind speed of the hub of the wind turbine blade of the standard wind turbine, v is the independent variable, v' eq,m-1 is the equivalent wind turbine blade speed of the wind turbine to be measured in the (m-1)-th sampling period, P m-1 is the net power corresponding to the equivalent wind turbine blade speed of the wind turbine to be measured in the (m-1)-th sampling period, P m+1 is the net power corresponding to the equivalent wind turbine blade speed of the wind turbine to be measured in the (m+1)-th sampling period.

[0032] The present invention provides a device for determining the power generation amount of a wind turbine. The improvement lies in that the device includes:

[0033] A first determination module, configured to determine the equivalent wind turbine blade speed of the wind turbine to be measured during the measurement period according to the equivalent nacelle wind speed of the wind turbine to be measured during the measurement period;

[0034] A second determination module, configured to determine the power generation amount of the wind turbine to be measured during the measurement period according to the equivalent wind turbine blade speed of the wind turbine to be measured during the measurement period.

[0035] Preferably, the first determination module is specifically configured to:

[0036] Determine the equivalent wind turbine blade speed v' of the wind turbine to be measured in the m-th sampling period according to the following formula eq,m :

[0037] v' eq,m = s i (m)v' nac,m + o i (m)

[0038] In the formula, v' nac,m is the equivalent nacelle wind speed of the wind turbine to be measured in the m-th sampling period, s i (m) is the first coefficient of the bin interval i to which the equivalent wind turbine rotational speed or equivalent nacelle wind speed of the standard wind turbine belongs in the m-th sampling period, o i (m) is the intercept of the bin interval i to which the wind turbine rotational speed or nacelle wind speed of the standard wind turbine belongs in the m-th sampling period, m ∈ N, and N is the total number of sampling periods during the measurement period.

[0039] Further, when the equivalent wind turbine rotor speed in the current sampling period of the standard wind turbine is less than the rated wind turbine rotor speed, divide the equivalent wind turbine rotor speed data in the sampling period before the current sampling period of the standard wind turbine into bin intervals at an interval of 0.5 r / min, and determine the first coefficient s i (m) and the intercept o i (m) of the bin interval i to which the wind turbine rotor speed of the standard wind turbine in the m-th sampling period belongs according to the following formula:

[0040]

[0041] o i (m) = v eq,i - s i (m)v nac,i

[0042] In the formula, v eq,i is the mean value of the equivalent wind turbine wind speed of the standard wind turbine corresponding to the sampling period in which the equivalent wind turbine rotor speed included in the bin interval i is located, and v eq,i+1 is the mean value of the equivalent wind turbine wind speed of the standard wind turbine corresponding to the sampling period in which the equivalent wind turbine rotor speed included in the bin interval i + 1 is located, and v nac,i is the mean value of the equivalent nacelle wind speed of the standard wind turbine corresponding to the sampling period in which the equivalent wind turbine rotor speed included in the bin interval i is located, and v nac,i+1 is the mean value of the equivalent nacelle wind speed of the standard wind turbine corresponding to the sampling period in which the equivalent wind turbine rotor speed included in the bin interval i + 1 is located;

[0043] When the equivalent wind turbine rotor speed in the current sampling period of the standard wind turbine is equal to the rated wind turbine rotor speed, divide the equivalent nacelle wind speed data of the standard wind turbine in the current sampling period and after the current sampling period into bin intervals at an interval of 0.5 m / s, and use the method in IEC61400-12-2:2013 to determine the first coefficient s i (m) and the intercept o i (m) of the bin interval i to which the equivalent nacelle wind speed of the standard wind turbine in the m-th sampling period belongs.

[0044] Further, determine the mean value v eq,i of the equivalent wind turbine wind speed of the standard wind turbine corresponding to the sampling period in which the equivalent wind turbine rotor speed included in the bin interval i is located and the mean value v nac,i of the equivalent nacelle wind speed of the standard wind turbine corresponding to the sampling period in which the equivalent wind turbine rotor speed included in the bin interval i is located according to the following formula:

[0045]

[0046]

[0047] In the formula, v eq,i,j is the equivalent wind turbine wind speed of the standard wind turbine corresponding to the sampling period corresponding to the jth equivalent wind turbine speed in the bin interval i, v nac,i,j is the equivalent nacelle wind speed of the standard wind turbine corresponding to the sampling period corresponding to the jth equivalent wind turbine speed in the bin interval i, N i is the number of equivalent wind turbine speeds included in the bin interval i, j ∈ [0, N i ;

[0048] Furthermore, the equivalent wind turbine wind speed v of the standard wind turbine corresponding to the sampling period corresponding to the jth equivalent wind turbine speed in the bin interval i is determined according to the following formula eq,i,j :

[0049]

[0050] In the formula, v h is the average free-stream wind speed of the standard wind turbine in the hth measurement height section, A h is the measurement area of the hth measurement height section, A is the swept area of the wind turbine of the standard wind turbine, n is the total number of measurement height sections, ρ j is the average air density of the sampling period corresponding to the jth equivalent wind turbine speed in the bin interval i, ρ is the standard air density.

[0051] Furthermore, the measurement area A of the hth measurement height section is determined according to the following formula h :

[0052]

[0053] In the formula, D is the diameter of the wind turbine of the standard wind turbine, H is the hub height of the wind turbine of the standard wind turbine, and Z is the hth measurement height section.

[0054] Preferably, the second determination module is specifically configured to:

[0055] Determine the annual energy production AEP of the wind turbine to be measured during the measurement period according to the following formula:

[0056]

[0057] In the formula, v ave is the average wind speed of the hub of the wind turbine of the standard wind turbine, v is the independent variable, v' eq,m-1 is the equivalent wind turbine wind speed of the wind turbine to be measured in the (m - 1)th sampling period, P m-1 is the net power corresponding to the equivalent wind turbine wind speed of the wind turbine to be measured in the (m - 1)th sampling period, P m+1is the net power corresponding to the equivalent wind turbine rotor speed of the wind turbine to be measured in the (m + 1)-th sampling period.

[0058] Compared with the closest prior art, the beneficial effects of the present invention are as follows:

[0059] A method and device for determining the power generation of a wind turbine provided by the present invention determine the equivalent wind turbine rotor speed of the wind turbine to be measured through the equivalent nacelle speed of the wind turbine to be measured, and then obtain the power generation of the wind turbine to be measured based on the equivalent wind turbine rotor speed of the wind turbine to be measured, improving the accuracy of the power generation of the wind turbine.

[0060] Among them, when determining the equivalent wind turbine rotor speed of the wind turbine to be measured, the primary coefficient and intercept of the bin interval of the standard wind turbine in the same wind farm as the wind turbine to be measured are used to process the equivalent nacelle speed of the wind turbine to be measured. There is no need to install multiple anemometer towers or radar anemometers in the wind farm, reducing the test cost and time. When dividing the bin interval of the standard wind turbine, the influence of the equivalent wind turbine rotor speed of the standard wind turbine on the result is considered, and the free flow wind speed of the hub at different height sections is measured when measuring the equivalent wind turbine rotor speed of the standard wind turbine, considering the influence of wind turbine rotation and wind shear on the nacelle speed, improving the accuracy of the equivalent wind turbine rotor speed. Description of the Drawings

[0061] Figure 1 is the flowchart of the method for determining the power generation of the wind turbine of the present invention;

[0062] Figure 2 is the structure diagram of the device for determining the power generation of the wind turbine of the present invention. Detailed Embodiments

[0063] The following further elaborates on the detailed embodiments of the present invention with reference to the drawings.

[0064] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0065] The present invention provides a method for determining the power generation of a wind turbine, as Figure 1 shown, the method includes:

[0066] Determine the equivalent wind turbine rotor speed of the wind turbine to be measured during the measurement period based on the equivalent nacelle speed of the wind turbine to be measured during the measurement period;

[0067] Determine the power generation of the wind turbine to be measured during the measurement period according to the equivalent wind turbine speed of the wind turbine to be measured during the measurement period.

[0068] In the method, determining the equivalent wind turbine speed of the wind turbine to be measured during the measurement period according to the equivalent nacelle speed of the wind turbine to be measured during the measurement period includes:

[0069] Determine the equivalent wind turbine speed v' of the wind turbine to be measured in the m-th sampling period according to the following formula eq,m :

[0070] v' eq,m = s i (m)v' nac,m + o i (m)

[0071] In the formula, v' nac,m is the equivalent nacelle speed of the wind turbine to be measured in the m-th sampling period, s i (m) is the first coefficient of the bin interval i to which the equivalent wind turbine speed or equivalent nacelle speed of the standard wind turbine in the m-th sampling period belongs, o i (m) is the intercept of the bin interval i to which the wind turbine speed or nacelle speed of the standard wind turbine belongs in the m-th sampling period, m ∈ N, and N is the total number of sampling periods in the measurement period.

[0072] Among them, the acquisition of the bin interval i is specifically as follows:

[0073] When the equivalent wind turbine speed of the standard wind turbine in the current sampling period is less than the rated wind turbine speed, divide the equivalent wind turbine speed data of the sampling periods before the current sampling period of the standard wind turbine into bin intervals at intervals of 0.5 r / min, and determine the first coefficient s of the bin interval i to which the wind turbine speed of the standard wind turbine in the m-th sampling period belongs according to the following formula i (m) and intercept o i (m):

[0074]

[0075] o i (m) = v eq,i - s i (m)v nac,i

[0076] In the formula, v eq,i is the mean value of the equivalent wind turbine speeds of the standard wind turbines corresponding to the sampling periods corresponding to the equivalent wind turbine speeds included in the bin interval i, v eq,i+1 is the mean value of the equivalent wind turbine speeds of the standard wind turbines corresponding to the sampling periods corresponding to the equivalent wind turbine speeds included in the bin interval i + 1, v nac,iis the mean value of the equivalent nacelle wind speed of the standard wind turbine corresponding to the sampling period corresponding to the equivalent wind turbine speed included in the bin interval i, v nac,i+1 is the mean value of the equivalent nacelle wind speed of the standard wind turbine corresponding to the sampling period corresponding to the equivalent wind turbine speed included in the bin interval i + 1; the central value of the bin interval is an integer multiple of 0.5 r / min. For example, the second bin interval is 2.25 r / min to 2.75 r / min. If the equivalent wind turbine speed of the standard wind turbine in a sampling period is 2.26 r / min, then the equivalent wind turbine speed of the standard wind turbine in this sampling period belongs to the second interval.

[0077] When the equivalent wind turbine speed of the standard wind turbine in the current sampling period is equal to the rated wind turbine speed, the equivalent nacelle wind speed data of the standard wind turbine in the current sampling period and after the current sampling period are divided into bin intervals at an interval of 0.5 m / s, and the first coefficient s i (m) and the intercept o i (m) of the bin interval i to which the equivalent nacelle wind speed of the standard wind turbine in the mth sampling period belongs are determined by the method in IEC61400-12-2:2013; the central value of the bin interval is an integer multiple of 0.5 m / s. For example, the 20th interval is 10.25 m / s to 10.75 m / s. If the equivalent nacelle wind speed of the standard wind turbine in a sampling period is 10.26 m / s, then the equivalent nacelle wind speed of the standard wind turbine in this sampling period belongs to the 20th interval.

[0078] Further, the mean value v eq,i of the equivalent wind turbine speed of the standard wind turbine corresponding to the sampling period included in the bin interval i and the mean value v nac,i of the equivalent nacelle wind speed of the standard wind turbine corresponding to the sampling period included in the bin interval i are determined according to the following formula:

[0079]

[0080]

[0081] In the formula, v eq,i,j is the equivalent wind turbine speed of the standard wind turbine corresponding to the jth equivalent wind turbine speed in the bin interval i, v nac,i,j is the equivalent nacelle wind speed of the standard wind turbine corresponding to the jth equivalent wind turbine speed in the bin interval i, N i is the number of equivalent wind turbine speeds included in the bin interval i, and j ∈ [0, N i ;

[0082] Further, the equivalent wind turbine wind speed v of the standard wind turbine corresponding to the sampling period of the j-th equivalent wind turbine speed in the bin interval i is determined according to the following formula eq,i,j :

[0083]

[0084] In the formula, v h is the average free-stream wind speed of the standard wind turbine in the h-th measurement height section, A h is the measurement area of the h-th measurement height section, A is the swept area of the wind turbine of the standard wind turbine, n is the total number of measurement height sections, ρ j is the average air density corresponding to the sampling period of the j-th equivalent wind turbine speed in the bin interval i, and ρ is the standard air density.

[0085] Further, the measurement area A of the h-th measurement height section is determined according to the following formula h :

[0086]

[0087] In the formula, D is the diameter of the wind turbine of the standard wind turbine, H is the hub height of the wind turbine of the standard wind turbine, and Z is the h-th measurement height section.

[0088] In a specific embodiment, the acquisition of the average free-stream wind speed of the standard wind turbine includes: selecting a wind turbine with no obvious difference in the surrounding terrain in the wind farm as the standard wind turbine, installing a lidar anemometer at a distance of 2D to 4D from the selected standard wind turbine, and vertically scanning the free-stream wind speeds of five height sections of H, H + 1 / 3D, H - 1 / 3D, H + 1 / 2D, and H - 1 / 2D for a sampling period of ten minutes to obtain the average free-stream wind speed.

[0089] Determining the power generation of the wind turbine to be measured during the measurement period according to the equivalent wind turbine wind speed of the wind turbine to be measured during the measurement period in the method includes:

[0090] Determine the annual energy production AEP of the wind turbine to be measured during the measurement period according to the following formula:

[0091]

[0092] In the formula, v ave is the average wind speed of the hub of the wind turbine of the standard wind turbine, v is the independent variable, v' eq,m-1 is the equivalent wind turbine wind speed of the wind turbine to be measured in the (m - 1)-th sampling period, P m-1 is the net power corresponding to the equivalent wind turbine wind speed of the wind turbine to be measured in the (m - 1)-th sampling period, P m+1is the net power corresponding to the equivalent wind turbine rotor speed of the wind turbine to be measured in the (m + 1)-th sampling period.

[0093] The present invention provides a device for determining the power generation of a wind turbine, as Figure 2 shown. The device includes:

[0094] A first determination module, configured to determine the equivalent wind turbine rotor speed of the wind turbine to be measured in a measurement period according to the equivalent nacelle speed of the wind turbine to be measured in the measurement period;

[0095] A second determination module, configured to determine the power generation of the wind turbine to be measured in the measurement period according to the equivalent wind turbine rotor speed of the wind turbine to be measured in the measurement period.

[0096] Preferably, the first determination module is specifically configured to:

[0097] Determine the equivalent wind turbine rotor speed v' of the wind turbine to be measured in the m-th sampling period according to the following formula eq,m :

[0098] v' eq,m = s i (m)v' nac,m + o i (m)

[0099] In the formula, v' nac,m is the equivalent nacelle speed of the wind turbine to be measured in the m-th sampling period, s i (m) is the first-order coefficient of the bin interval i to which the equivalent wind turbine rotor speed or equivalent nacelle speed of the standard wind turbine in the m-th sampling period belongs, o i (m) is the intercept of the bin interval i to which the wind turbine rotor speed or nacelle speed of the standard wind turbine belongs in the m-th sampling period, m ∈ N, and N is the total number of sampling periods in the measurement period.

[0100] Further, when the equivalent wind turbine rotor speed of the standard wind turbine in the current sampling period is less than the rated wind turbine rotor speed, the equivalent wind turbine rotor speed data of the sampling periods before the current sampling period of the standard wind turbine are divided into bin intervals at an interval of 0.5 r / min, and the first-order coefficient s i (m) and intercept o i (m) of the bin interval i to which the wind turbine rotor speed of the standard wind turbine in the m-th sampling period belongs are determined according to the following formula:

[0101]

[0102] o i (m)= v eq,i - s i (m)v nac,i

[0103] In the formula, veq,i is the mean value of the equivalent wind turbine rotor speed in the sampling period corresponding to the equivalent wind turbine rotor speed included in the bin interval i, v eq,i+1 is the mean value of the equivalent wind turbine rotor speed in the sampling period corresponding to the equivalent wind turbine rotor speed included in the bin interval i + 1, v nac,i is the mean value of the equivalent nacelle wind speed of the standard wind turbine in the sampling period corresponding to the equivalent wind turbine rotor speed included in the bin interval i, v nac,i+1 is the mean value of the equivalent nacelle wind speed of the standard wind turbine in the sampling period corresponding to the equivalent wind turbine rotor speed included in the bin interval i + 1;

[0104] When the equivalent wind turbine rotor speed in the current sampling period of the standard wind turbine is equal to the rated wind turbine rotor speed, the equivalent nacelle wind speed data of the standard wind turbine in the current sampling period and after the current sampling period are divided into bin intervals at intervals of 0.5 m / s, and the first coefficient s i (m) and the intercept o i (m) of the bin interval i where the equivalent nacelle wind speed of the standard wind turbine in the mth sampling period belongs are determined by the method in IEC61400-12-2:2013.

[0105] Further, the mean value v eq,i of the equivalent wind turbine rotor speed of the standard wind turbine in the sampling period corresponding to the equivalent wind turbine rotor speed included in the bin interval i and the mean value v nac,i of the equivalent nacelle wind speed of the standard wind turbine in the sampling period corresponding to the equivalent wind turbine rotor speed included in the bin interval i are determined according to the following formula:

[0106]

[0107]

[0108] In the formula, v eq,i,j is the equivalent wind turbine rotor speed of the standard wind turbine in the sampling period corresponding to the jth equivalent wind turbine rotor speed in the bin interval i, v nac,i,j is the equivalent nacelle wind speed of the standard wind turbine in the sampling period corresponding to the jth equivalent wind turbine rotor speed in the bin interval i, N i is the number of equivalent wind turbine rotor speeds included in the bin interval i, j ∈ [0, N i ;

[0109] Further, the equivalent wind turbine rotor speed v eq,i,j of the standard wind turbine in the sampling period corresponding to the jth equivalent wind turbine rotor speed in the bin interval i is determined according to the following formula:

[0110]

[0111] wherein, v h is the average free - flow wind speed of the standard wind turbine in the h - th measurement height section, A h is the area of the measurement region in the h - th measurement height section, A is the swept area of the wind turbine rotor of the standard wind turbine, n is the total number of measurement height sections, ρ j is the average air density of the sampling period corresponding to the j - th equivalent wind turbine rotational speed in bin interval i, and ρ is the standard air density.

[0112] Further, the measurement region area A of the h - th measurement height section is determined according to the following formula h :

[0113]

[0114] wherein, D is the diameter of the wind turbine rotor of the standard wind turbine, H is the hub height of the wind turbine rotor of the standard wind turbine, and Z is the h - th measurement height section.

[0115] Preferably, the second determination module is specifically configured to:

[0116] Determine the generated energy AEP of the wind turbine to be measured during the measurement period according to the following formula:

[0117]

[0118] wherein, v ave is the average wind speed of the hub of the wind turbine rotor of the standard wind turbine, v is the independent variable, v' eq,m-1 is the equivalent wind turbine wind speed of the wind turbine to be measured in the (m - 1) - th sampling period, P m-1 is the net power corresponding to the equivalent wind turbine wind speed of the wind turbine to be measured in the (m - 1) - th sampling period, P m+1 is the net power corresponding to the equivalent wind turbine wind speed of the wind turbine to be measured in the (m + 1) - th sampling period.

[0119] In summary, for the method and device for determining the generated energy of a wind turbine provided by the present invention, the equivalent wind turbine wind speed of the wind turbine to be measured is determined through the equivalent nacelle wind speed of the wind turbine to be measured, and then the generated energy of the wind turbine to be measured is obtained according to the equivalent wind turbine wind speed of the wind turbine to be measured, improving the accuracy of the generated energy of the wind turbine;

[0120] Among them, in determining the equivalent wind turbine speed of the wind turbine to be measured, the equivalent nacelle speed of the wind turbine to be measured is processed by using the first-order coefficient and intercept of the bin interval of the standard wind turbine in the same wind farm as the wind turbine to be measured. There is no need to install multiple anemometers or radar wind sensors in the wind farm, which reduces the cost and time of testing. When dividing the bin interval of the standard wind turbine, the influence of the equivalent wind turbine speed of the standard wind turbine on the result is considered, and the free stream wind speeds of the hubs at different height segments are measured when measuring the equivalent wind turbine speed of the standard wind turbine. The influence of wind turbine rotation and wind shear on the nacelle speed is considered, which improves the accuracy of the equivalent wind turbine speed.

[0121] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0122] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of the flows and / or blocks in the flowchart and / or block diagram can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for realizing the functions specified in one Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0123] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured product including an instruction device, and the instruction device realizes the functions specified in one Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0124] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Therefore, the instructions executed on the computer or other programmable device provide for realizing the functions in the process Figure 1One process or multiple processes and / or boxes Figure 1 Steps of the functions specified in one box or multiple boxes.

[0125] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific embodiments of the present invention, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A method for determining the power generation of a wind turbine, characterized in that, The method includes: Determining the equivalent wind turbine rotor speed of the wind turbine to be measured during the measurement period according to the equivalent nacelle wind speed of the wind turbine to be measured during the measurement period; Determining the power generation of the wind turbine to be measured during the measurement period according to the equivalent wind turbine rotor speed of the wind turbine to be measured during the measurement period; The determining the equivalent wind turbine rotor speed of the wind turbine to be measured during the measurement period according to the equivalent nacelle wind speed of the wind turbine to be measured during the measurement period includes: Determine the equivalent wind turbine rotor speed v' of the wind turbine to be measured in the m-th sampling period according to the following formula eq,m : v' eq,m = s i (m)v' nac,m + o i (m) where v' nac,m is the equivalent nacelle wind speed of the wind turbine to be measured in the m-th sampling period, in m / s i (m) is the first-order coefficient of the equivalent wind turbine speed or the equivalent nacelle wind speed of the standard wind turbine in the bin interval i in the m-th sampling period, in m / s i (m) is the intercept of the wind turbine speed or the nacelle wind speed of the standard wind turbine in the bin interval i in the m-th sampling period, m ∈ N, and N is the total number of sampling periods in the measurement cycle; When the equivalent wind turbine rotor speed of the standard wind turbine in the current sampling period is less than the rated wind turbine rotor speed, the equivalent wind turbine rotor speed data in the sampling period before the current sampling period of the standard wind turbine is divided into bin intervals at an interval of 0.5 r / min, and the first-order coefficient s i (m) and the intercept o i (m) are determined according to the following formula: o i (m) = v eq,i -s i (m)v nac,i where, v eq,i is the mean value of the equivalent wind turbine rotor wind speed corresponding to the sampling period included in the bin interval i, and v eq,i+1 is the mean value of the equivalent wind turbine rotor wind speed corresponding to the sampling period included in the bin interval i + 1, and v nac,i is the mean value of the equivalent nacelle wind speed of the standard wind turbine corresponding to the sampling period included in the bin interval i, and v nac,i+1 is the mean value of the equivalent nacelle wind speed of the standard wind turbine corresponding to the sampling period included in the bin interval i + 1; When the equivalent wind turbine rotor speed of the standard wind turbine in the current sampling period is equal to the rated wind turbine rotor speed, divide the equivalent nacelle wind speed data of the standard wind turbine in the current sampling period and after the current sampling period into bin intervals at intervals of 0.5 m / s, and use the method in IEC 61400-12-2:2013 to determine the first coefficient s of the bin interval i to which the equivalent nacelle wind speed of the standard wind turbine in the m-th sampling period belongs i (m) and the intercept o i (m).

2. The method according to claim 1, characterized in that, Determine the mean value \(v\) of the equivalent wind turbine wind speed for the sampling period corresponding to the equivalent wind turbine rotational speed included in the bin interval \(i\) according to the following formula eq,i and the mean value \(v\) of the equivalent nacelle wind speed of the standard wind turbine for the sampling period corresponding to the equivalent wind turbine rotational speed included in the bin interval \(i\) nac,i : where, v eq,i,j is the equivalent wind turbine rotor speed corresponding to the sampling period corresponding to the j-th equivalent wind turbine rotor speed in the bin interval i, v nac,i,j is the equivalent nacelle wind speed of the standard wind turbine corresponding to the sampling period corresponding to the j-th equivalent wind turbine rotor speed in the bin interval i, N i is the number of equivalent wind turbine rotor speeds included in the bin interval i, j ∈ [0, N i .

3. The method according to claim 2, characterized in that, Determine the equivalent wind turbine wind speed \(v\) of the standard wind turbine for the sampling period corresponding to the \(j\)-th equivalent wind turbine rotational speed in the bin interval \(i\) according to the following formula eq,i,j : where, v h is the average free stream wind speed of the standard wind turbine in the h-th measurement height section, A h is the measurement area of the h-th measurement height section, A is the swept area of the wind turbine of the standard wind turbine, n is the total number of measurement height sections, ρ j is the average air density of the sampling period corresponding to the j-th equivalent wind turbine rotation speed in the bin interval i, and ρ is the standard air density.

4. The method according to claim 3, characterized in that, Determine the measurement area A of the h-th measurement height segment according to the following formula h :[[]]END]] In the formula, D is the diameter of the wind turbine rotor of the standard wind turbine, H is the hub height of the wind turbine rotor of the standard wind turbine, and Z is the h-th measurement height section.

5. The method according to claim 1, characterized in that, The determining the power generation of the wind turbine to be measured during the measurement period according to the equivalent wind turbine rotor speed of the wind turbine to be measured during the measurement period includes: Determining the power generation AEP of the wind turbine to be measured during the measurement period according to the following formula: Wherein, v ave is the average wind speed of the hub of the wind turbine of the standard wind turbine, v is the independent variable, v' eq,m-1 is the equivalent wind turbine speed of the wind turbine to be measured in the (m-1)th sampling period, P m-1 is the net power corresponding to the equivalent wind turbine speed of the wind turbine to be measured in the (m-1)th sampling period, P m+1 is the net power corresponding to the equivalent wind turbine speed of the wind turbine to be measured in the (m+1)th sampling period.

6. A device for determining the power generation of a wind turbine, characterized in that, The device includes: A first determination module, configured to determine the equivalent wind turbine rotor speed of the wind turbine to be measured during the measurement period according to the equivalent nacelle wind speed of the wind turbine to be measured during the measurement period; A second determination module, configured to determine the power generation of the wind turbine to be measured during the measurement period according to the equivalent wind turbine rotor speed of the wind turbine to be measured during the measurement period; The first determination module is specifically configured to: Determine the equivalent wind turbine rotor speed v' of the wind turbine to be measured in the m-th sampling period according to the following formula eq,m :[[]]END]] v' eq,m = s i (m)v' nac,m + o i (m) where, v' nac,m is the equivalent nacelle wind speed of the wind turbine to be measured in the m-th sampling period, m / s i (m) is the first-order coefficient of the equivalent wind turbine speed or the equivalent nacelle wind speed of the standard wind turbine in the bin interval i in the m-th sampling period, m / s i (m) is the intercept of the wind turbine speed or nacelle wind speed of the standard wind turbine in the bin interval i in the m-th sampling period, m ∈ N, and N is the total number of sampling periods within the measurement period; When the equivalent wind turbine rotor speed of the standard wind turbine in the current sampling period is less than the rated wind turbine rotor speed, divide the equivalent wind turbine rotor speed data of the sampling periods before the current sampling period of the standard wind turbine into bin intervals at an interval of 0.5 r / min, and determine the first-order coefficient s i (m) and the intercept o i (m) of the bin interval i to which the wind turbine rotor speed of the standard wind turbine in the m-th sampling period belongs according to the following formula: o i (m) = v eq,i -s i (m)v nac,i wherein, v eq,i is the mean value of the equivalent wind turbine blade speed corresponding to the sampling period included in the bin interval i, v eq,i+1 is the mean value of the equivalent wind turbine blade speed corresponding to the sampling period included in the bin interval i + 1, v nac,i is the mean value of the equivalent nacelle speed corresponding to the sampling period included in the bin interval i, v nac,i+1 is the mean value of the equivalent nacelle speed corresponding to the sampling period included in the bin interval i + 1; When the equivalent wind turbine rotor speed of the standard wind turbine in the current sampling period is equal to the rated wind turbine rotor speed, divide the equivalent nacelle wind speed data of the standard wind turbine in the current sampling period and after the current sampling period into bin intervals at intervals of 0.5 m / s, and use the method in IEC 61400-12-2:2013 to determine the first coefficient s of the bin interval i to which the equivalent nacelle wind speed of the standard wind turbine in the m-th sampling period belongs i (m) and the intercept o i (m).

7. The device according to claim 6, characterized in that, Determine the mean value \(v\) of the equivalent wind turbine wind speed for the sampling period corresponding to the equivalent wind turbine rotational speed included in the \(i\)-th bin interval according to the following formula eq,i and the mean value \(v\) of the equivalent nacelle wind speed of the standard wind turbine for the sampling period corresponding to the equivalent wind turbine rotational speed included in the \(i\)-th bin interval nac,i : where, v eq,i,j is the equivalent wind turbine rotor speed corresponding to the sampling period corresponding to the j-th equivalent wind turbine rotor speed in the bin interval i, and v nac,i,j is the equivalent nacelle wind speed of the standard wind turbine corresponding to the sampling period corresponding to the j-th equivalent wind turbine rotor speed in the bin interval i, N i is the number of equivalent wind turbine rotor speeds included in the bin interval i, and j ∈ [0, N i .

8. The device according to claim 7, characterized in that, Determine the equivalent wind turbine wind speed \(v\) of the standard wind turbine for the sampling period corresponding to the \(j\)-th equivalent wind turbine rotational speed in the bin interval \(i\) according to the following formula eq,i,j : where v h is the average free-stream wind speed of the standard wind turbine in the h-th measurement height section, A h is the measurement area of the h-th measurement height section, A is the swept area of the wind turbine of the standard wind turbine, n is the total number of measurement height sections, ρ j is the average air density of the sampling period corresponding to the j-th equivalent wind turbine rotation speed in the bin interval i, and ρ is the standard air density.

9. The device according to claim 8, characterized in that, Determine the measurement area A of the h-th measurement height segment according to the following formula h : In the formula, D is the diameter of the wind turbine rotor of the standard wind turbine, H is the hub height of the wind turbine rotor of the standard wind turbine, and Z is the h-th measurement height section.

10. The device according to claim 6, characterized in that, The second determination module is specifically configured to: Determine the power generation AEP of the wind turbine to be measured during the measurement period according to the following formula: Wherein, v ave is the average wind speed of the hub of the wind turbine of the standard wind turbine, v is the independent variable, v' eq,m-1 is the equivalent wind turbine speed of the wind turbine to be measured in the (m - 1)-th sampling period, P m-1 is the net power corresponding to the equivalent wind turbine speed of the wind turbine to be measured in the (m - 1)-th sampling period, P m+1 is the net power corresponding to the equivalent wind turbine speed of the wind turbine to be measured in the (m + 1)-th sampling period.

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