A calculation method for the lost power of a wind power generation device

Abstract

The present invention discloses a method for calculating the lost power of a wind power generation device, including calculating the lost power of wind power generation and correcting the lost power of wind power generation. The calculation of the lost power of wind power generation is used to calculate the lost power during the shutdown duration of a non-operating fan. The calculation formula is: lost power = (X / Y) * A * B, where A is the shutdown duration of the fan, B is the power generation capacity coefficient of the fan, X is the power generation of other fans of the same model during this time period, and Y is the operating duration of other fans of the same model during this time period. The correction of the lost power of wind power generation is used to correct the lost power within 30 s of a non-operating fan. The correction formula is: lost power within 30 s = W * 30 / 3600, where W is the corresponding power of obtaining the average wind speed within 30 s by the fan number in a quarter. The lost power calculation method of the present invention can calculate the lost power of the fan more accurately, and through the correction algorithm, better eliminate the deviation caused by abnormal interference factors.

Description

Technical Field

[0001] The present invention relates to the technical field related to wind power generation, and specifically to a method for calculating the lost power of a wind power generation device. Background Art

[0002] Wind turbines can be shut down due to faults in the turbines themselves, equipment maintenance, grid faults, and lack of spare parts, which will affect the normal power generation of the turbines and cause power loss. Better distinguishing the causes of power loss can further strengthen equipment management and preventive maintenance, and improve the equipment availability.

[0003] At present, there is a wind power prediction system in power plants, which will predict data such as the power generation that can be achieved and the lost power according to the current operating state of the wind turbines and future weather forecasts. This calculation method cannot obtain the real-time wind speed of the wind turbines when the wind turbines are powered off, resulting in the inability to calculate; the theoretical power corresponding to the wind speed cannot reach the corresponding load during the pitch change process of the wind turbines, so the calculation is also inaccurate; the measurement will be inaccurate after the anemometer has been running for a long time, which will also affect the calculation of the lost power; the wind frequency distribution obtained by statistics of the anemometer on the nacelle and the power generation calculated according to the guaranteed power curve, but due to the influence of theoretical statistics, control, and some uncertainties, the calculation of the lost power is inaccurate.

[0004] Since the reasons for the lost power of the wind turbines and the lost power data are caused by various factors such as the state of the wind turbines, the instantaneous wind speed of the wind turbines, the effective wind speed, the wind direction, and the rated power, through mathematical formulas and logical algorithms, more accurate reasons for the lost power and lost power data can be obtained, which can provide an effective basis for the company's management decision-making. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for calculating the lost power of a wind power generation device to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A method for calculating the lost power of a wind power generation device includes calculating the lost power of wind power generation and correcting the lost power of wind power generation. The calculation of the lost power of wind power generation is used to calculate the lost power during the shutdown duration of the wind turbines in the non-operating state. The calculation formula is: Lost power = (X / Y) * A * B, where A is the shutdown duration of the wind turbine, B is the power generation capacity coefficient of the wind turbine, X is the power generation of other wind turbines of the same type during this time period, and Y is the operating duration of other wind turbines of the same type during this time period;

[0008] The correction of the power loss in wind power generation is used to correct the power loss of the non-operating wind turbines within 30 seconds. The correction formula is: power loss within 30 seconds = W * 30 / 3600, where W is the corresponding power of the average wind speed obtained by the wind turbine number within a quarter for 30 seconds.

[0009] The calculation of the power loss in wind power generation includes the following steps:

[0010] (1) Use the wind turbine power prediction system of the power plant to monitor the wind turbine status every 30 seconds. When the wind turbine status is detected as non-operating, record the wind turbine number and the start shutdown time, and continue to monitor until the wind turbine status changes, then record the end shutdown time.

[0011] (2) According to the wind turbine shutdown and startup records, obtain the shutdown duration of the wind turbine, calculate the power generation and cumulative operation duration of other wind turbines of the same type during this period, calculate the power generation and operation duration of each wind turbine in the hour before the shutdown time of this wind turbine, calculate the power generation capacity coefficient of this wind turbine, and calculate the power loss of the wind turbine.

[0012] The correction of the power loss in wind power generation includes the following steps:

[0013] (1) Use big data mining technology to calculate the historical records of a single wind turbine in the same quarter, clean the data such as wind turbine fault data, power limit data, wind speed below 3 meters, wind speed above 15 meters, etc., classify the data at 0.1-meter wind speed intervals, and use the mean square error mathematical algorithm to clean the data with standard values exceeding plus or minus 1 to obtain the wind speed corresponding power relationship data.

[0014] (2) The system monitors the wind turbine status every 30 seconds. When the status is detected as non-operating, record the wind turbine number, start shutdown time, end shutdown time, and the average wind speed of this wind turbine within 30 seconds. Obtain the wind speed corresponding power according to the quarter and wind turbine number, and calculate the power loss of this wind turbine within 30 seconds.

[0015] In step (1), if the front and rear node times of the wind turbine status change are respectively before and after zero o'clock, the system will automatically close the loop at 24:00 and simultaneously start a zero o'clock shutdown data.

[0016] In step (1), the wind turbine status also includes states such as dispatching power limit, abnormal power limit, standby, power limit shutdown, affected within the field, affected outside the field, regular inspection shutdown, maintenance shutdown, weather shutdown, non-resettable fault, resettable fault, and offline.

[0017] As a further solution of the present invention:

[0018] As a further solution of the present invention:

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: The power loss calculation method of the present invention can calculate the power loss of the wind turbine more accurately. Through the correction algorithm, it can better eliminate the deviation caused by abnormal interference factors, providing high-quality data support for enterprises to improve power generation efficiency. Brief Description of the Drawings

[0020] Figure 1 It is a flowchart of the present invention. Detailed Embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figure 1 , in the embodiments of the present invention, a method for calculating the power loss of a wind power generation device includes calculating the power loss of wind power generation and correcting the power loss of wind power generation.

[0023] 1. The calculation of the power loss of wind power generation includes the following processes:

[0024] (2) Use the fan power prediction system of the power plant to monitor the fan status every 30 seconds. When it is detected that the fan status is non-operating, record information such as the fan number, start shutdown time, and status, and continuously monitor until the fan status changes (such as from a fault to operation, from a fault to maintenance, etc.), and record the end shutdown time; if there is a situation where the time nodes before and after the fan status change span days, the system will automatically close the loop at 24:00 and simultaneously start a 0:00 shutdown data.

[0025] The above-mentioned fan status changes are not limited to normal, faulty, etc., but also include multiple working states such as dispatching power curtailment, abnormal power curtailment, standby, power curtailment shutdown, being affected within the field, being affected outside the field, regular inspection shutdown, maintenance shutdown, weather shutdown, non-resettable fault, resettable fault, and offline.

[0026] (2) According to the shutdown and startup records of the fan (assuming the M1 fan in Meiling Wind Farm), obtain the shutdown duration of the M1 fan (accurate to seconds) = A, calculate the power generation of other fans of the same model during this period = X, and the cumulative operation duration (in seconds) = Y.

[0027] Different from the traditional method, the previous wind turbine power generation capacity coefficient was maintained once a year, and the wind turbine coefficient was calculated based on the annual power generation. In the present invention, it is adjusted to calculate the power generation and operation duration of each wind turbine in the hour before the shutdown time of M1 wind turbine, and the power generation capacity coefficient of this wind turbine is calculated as B. Using the formula: (X / Y)*A*B = the lost power of M1 wind turbine, the lost power of the wind turbine is calculated.

[0028] 2. Correct the lost power of wind power generation. Since there will be errors in the calculation process, the following method is used for result comparison. If the result shows a large deviation, the result is corrected by the mean square deviation method. The specific calculation method is as follows:

[0029] Use big data mining technology to calculate the historical records of a single wind turbine in the same quarter, clean up the data such as wind turbine fault data, power limit data, wind speed below 3 meters, and wind speed above 15 meters, classify the data at 0.1-meter wind speed intervals, and use the mean square deviation mathematical algorithm to clean up the data with standard values exceeding plus or minus 1 to obtain the wind speed corresponding power relationship data. The system monitors the status of the wind turbine every 30 seconds. When the status is detected as non-operating, record the wind turbine number, start shutdown time, end shutdown time, and the average wind speed of this wind turbine within 30 seconds = S. Obtain the wind speed corresponding power = W according to the quarter and wind turbine number. Using the formula: W*30 / 3600 = lost power, the lost power within this 30 seconds is obtained.

[0030] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0031] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for calculating the lost power of a wind power generation device, including calculating the lost power of wind power generation and correcting the lost power of wind power generation, characterized in that: The calculation of the lost power in wind power generation is used to calculate the lost power during the shutdown duration of a non-operating wind turbine. The calculation formula is: Lost power = (X / Y) * A * B, where A is the shutdown duration of the wind turbine, B is the power generation capacity coefficient of the wind turbine, X is the power generation of other wind turbines of the same type during the shutdown duration, and Y is the operating duration of other wind turbines of the same type during the shutdown duration; The correction of the lost power in wind power generation is used to correct the lost power within 30 seconds of a non-operating wind turbine. The correction formula is: Lost power within 30 seconds = W * 30 / 3600, where W is the corresponding power of the average wind speed within 30 seconds obtained by the wind turbine number in a quarter.

2. The calculation method of the lost power of a wind power generation device according to claim 1, wherein: The calculation of the lost power in wind power generation includes the following steps: (1) Use the wind turbine power prediction system of the power plant to monitor the wind turbine status every 30 seconds. When the wind turbine status is detected as non-operating, record the wind turbine number and the start shutdown time. Continuously monitor until the wind turbine status changes, and then record the end shutdown time; (2) According to the wind turbine shutdown and startup records, obtain the shutdown duration of the wind turbine, calculate the power generation and cumulative operating duration of other wind turbines of the same type during this shutdown duration, calculate the power generation and operating duration of each wind turbine in the 1 hour before the shutdown time of this wind turbine, and calculate the power generation capacity coefficient of this wind turbine, and then calculate the lost power of the wind turbine.

3. The calculation method of the lost power of a wind power generation device according to claim 1, characterized in that: The correction of the lost power in wind power generation includes the following steps: (1) Use big data mining technology to calculate the historical records of a single wind turbine in the same quarter, clean up the data such as wind turbine failure data, power limit data, wind speed below 3 meters, wind speed above 15 meters, etc. Classify the data at 0.1-meter wind speed intervals, and use the mean square error mathematical algorithm to clean up the data with standard values exceeding plus or minus 1 to obtain the wind speed corresponding power relationship data; (2) The system monitors the wind turbine status every 30 seconds. When the status is detected as non-operating, record the wind turbine number, start shutdown time, end shutdown time, and the average wind speed of this wind turbine within 30 seconds. Obtain the wind speed corresponding power according to the quarter and wind turbine number, and calculate the lost power of this wind turbine within 30 seconds.

4. The calculation method of the lost power of a wind power generation device according to claim 2, characterized in that: In step (1), if the front and rear node times of the wind turbine status change are respectively before and after zero o'clock, the system will automatically close the loop at 24:00 and simultaneously start a zero o'clock shutdown data.

5. The calculation method for the lost power of a wind power generation device according to claim 2, characterized in that: In step (1), the wind turbine status also includes states such as dispatching power limit, abnormal power limit, standby, power limit shutdown, affected within the field, affected outside the field, regular inspection shutdown, maintenance shutdown, weather shutdown, non-resettable fault, resettable fault, and offline.

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