CN112526246A - Method and device for detecting working condition of super capacitor of wind generating set - Google Patents
Method and device for detecting working condition of super capacitor of wind generating set Download PDFInfo
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Abstract
A method and a device for detecting the working condition of a super capacitor of a wind generating set are provided. The method comprises the following steps: acquiring N groups of capacitor voltage data of the super capacitor in real time; calculating the overall variance of each group of capacitance voltage data to obtain N overall variances; and determining the working condition of the super capacitor based on the maximum value of the N total variances and a preset value.
Description
Technical Field
The application relates to a super capacitor working condition detection method and device of a wind generating set, in particular to a super capacitor working condition detection method and device for determining whether a super capacitor of a wind generating set of a super capacitor has a fault or not based on the total variance of voltage data of the super capacitor of the wind generating set.
Background
At present, whether the capacitor voltage of a super capacitor is abnormal or not can be detected by aiming at the detection of the super capacitor voltage of the wind generating set, for example, the capacitor voltage of the super capacitor is low or the capacitor voltage of the super capacitor is high, and the capacitor voltage abnormality can be caused by the fault of the super capacitor. Besides the possible faults of the super capacitor, the possible causes of the abnormal voltage of the capacitor also include various factors such as charger faults, power grid abnormalities, abnormal signal acquisition, loosening of super capacitor insurance, reduction of capacitance value of the super capacitor and the like, which obviously causes certain confusion on site fault removal and handling.
Disclosure of Invention
Aspects of the present disclosure are to address at least the above problems and/or disadvantages and to provide at least the advantages described below. Therefore, the invention aims to provide a super capacitor working condition detection method and a super capacitor working condition detection device for determining whether a super capacitor of a wind generating set of a super capacitor has a fault or not based on the total variance of voltage data of the super capacitor of the wind generating set.
One aspect of the present invention provides a method for detecting a super capacitor working condition of a wind turbine generator system, where the method includes: acquiring N groups of capacitor voltage data of the super capacitor in real time; calculating the overall variance of each group of capacitance voltage data to obtain N overall variances; and determining the working condition of the super capacitor based on the maximum value of the N total variances and a preset value.
Optionally, the step of determining the operating condition of the super capacitor based on the maximum value of the N overall variances and a predetermined value includes: determining that the ultracapacitor is not faulty when the maximum value is greater than a first threshold, the predetermined value comprising a first threshold.
Optionally, the step of determining the operating condition of the super capacitor based on the maximum value of the N overall variances and a predetermined value may further include: and when the maximum value is larger than a second threshold and smaller than a third threshold, determining that the super capacitor has a fault, wherein the predetermined value further comprises the second threshold and the third threshold, and the second threshold and the third threshold are both smaller than the first threshold.
Optionally, the step of determining the operating condition of the super capacitor based on the maximum value of the N overall variances and a predetermined value may further include: and when the maximum value is greater than a fourth threshold value and less than a fifth threshold value, determining that the super capacitor is about to fail, wherein the predetermined value further comprises the fourth threshold value and the fifth threshold value, and the fourth threshold value and the fifth threshold value are both less than or equal to the second threshold value.
Optionally, the method may further comprise: when the super capacitor is determined to be in fault, outputting early warning information for reminding the super capacitor of being in fault; and/or when the super capacitor is determined to have a fault, outputting information for reminding of replacing the super capacitor.
Optionally, the step of determining the operating condition of the super capacitor based on the maximum value of the N overall variances and a predetermined value may further include: and when the maximum value is larger than a sixth threshold and smaller than a seventh threshold, determining that no fault exists in the super capacitor, wherein the predetermined value further comprises the sixth threshold and the seventh threshold, and the sixth threshold and the seventh threshold are both smaller than or equal to the fifth threshold.
Another aspect of the present disclosure is to provide a super capacitor working condition detection device of a wind generating set, the device may include: the data acquisition unit is configured to acquire N groups of capacitor voltage data of the super capacitor in real time; a calculation unit configured to calculate a global variance of each set of the capacitance voltage data to obtain N global variances; and the working condition determining unit is configured to determine the working condition of the super capacitor based on the maximum value of the N total variances and a preset value.
Alternatively, the operating condition determining unit may be configured to: determining that there is no fault with the supercapacitor when the maximum value is greater than a first threshold; when the maximum value is larger than a second threshold value and smaller than a third threshold value, determining that the super capacitor has a fault, wherein the second threshold value and the third threshold value are smaller than the first threshold value; when the maximum value is larger than a fourth threshold value and smaller than a fifth threshold value, determining that the super capacitor is about to fail, wherein the fourth threshold value and the fifth threshold value are both smaller than or equal to a second threshold value; and when the maximum value is larger than a sixth threshold and smaller than a seventh threshold, determining that no fault exists in the super capacitor, wherein the sixth threshold and the seventh threshold are both smaller than or equal to a fifth threshold, and the predetermined values comprise a first threshold, a second threshold, a third threshold, a fourth threshold, a fifth threshold, a sixth threshold and a seventh threshold.
Optionally, the apparatus may further comprise: the reminding replacing unit is configured to output information for reminding of replacing the super capacitor when the super capacitor is determined to have a fault; and the fault early warning unit is configured to output early warning information for reminding that the super capacitor is about to fail when the super capacitor is determined to be about to fail.
Alternatively, the device may be provided in a pitch controller of a wind park.
Another aspect of the present disclosure is to provide a computer readable storage medium, wherein a computer program is stored thereon, which when executed, implements the method for detecting the supercapacitor operation condition of a wind turbine generator set as described above.
Drawings
The above and other aspects, features and advantages of particular embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart illustrating a method of detecting a supercapacitor condition of a wind park according to an embodiment of the present disclosure;
FIG. 2 is a diagram illustrating an example of a process of acquiring capacitance voltage data of a supercapacitor in real time according to an embodiment of the present disclosure;
FIG. 3 is a graph showing capacitance voltage data collected for a supercapacitor according to an embodiment of the disclosure;
FIG. 4 is a diagram illustrating collected capacitance voltage data for a supercapacitor according to another embodiment of the present disclosure;
FIG. 5 is a diagram illustrating collected capacitance voltage data for a supercapacitor according to another embodiment of the present disclosure;
FIG. 6 is a diagram illustrating collected capacitance voltage data for a supercapacitor according to another embodiment of the present disclosure;
FIG. 7 is a diagram illustrating collected capacitance voltage data for a supercapacitor according to another embodiment of the present disclosure; and
FIG. 8 is a block diagram illustrating a super capacitor condition detection apparatus of a wind turbine generator set according to an exemplary embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.
The variable pitch system of the wind generating set is used as one of core parts of a control system of a large wind generating set, and plays an important role in safe, stable and efficient operation of the set. The variable pitch control technology is that the pneumatic torque and the pneumatic power captured by the wind wheel are controlled by adjusting the pitch angle of the blades.
A super capacitor, also known as an electrochemical capacitor, is a power source with special properties between a conventional capacitor and a battery. The super capacitor has the advantages of high power density (300W/KG-5000W/KG, which is 5-10 times of that of a common battery), high charging speed (more than 95% of rated capacity can be achieved after charging for 10 seconds-10 minutes), long cycle life (more than 50 ten thousand times), wide working temperature range (minus 40 ℃ to plus 70 ℃) and the like, and is very suitable for severe working environment of a pitch system of a wind generating set. Due to uncertainty and dispersity of wind power, the generated electric energy fluctuates constantly and cannot be directly merged into a power grid, so that the super capacitor can be used for absorbing the electric energy to store redundant electric energy when the wind power is high, and when the wind power is low, discharging is carried out to make up for the fact that the terminal voltage is too low. When the voltage of the super capacitor fluctuates abnormally, the reason that the voltage of the capacitor fluctuates abnormally needs to be judged in time so as to remove the fault as soon as possible.
FIG. 1 is a flow chart illustrating a method for detecting the super capacitor operating condition of a wind generating set according to an embodiment of the disclosure.
In step S100, N sets of capacitor voltage data of the super capacitor are acquired in real time.
Fig. 2 is a diagram illustrating an example of a process of acquiring capacitance voltage data of a supercapacitor in real time according to an embodiment of the present disclosure.
Referring to fig. 2, the power distributor module of the pitch system converts a high voltage (i.e., a capacitor voltage of a super capacitor) at each position on the dc bus into a low voltage that can be detected by the PLC module, and inputs a low voltage signal to an analog input port of an analog acquisition module (e.g., a double-frequency KL3404 module), where a capacitor voltage data acquisition period may be 20 ms. And the analog quantity acquisition module transmits acquired capacitance voltage data to the controller. The controller (e.g., BX3100 controller) may process the collected capacitance voltage data for a plurality of cycles, for example, N sets of capacitance voltage data for the super capacitor may be generated, for example, N may be 10, and it should be understood that N may be other positive integers.
In step S110, the overall variance of each set of the acquired capacitance voltage data is calculated to obtain N overall variances.
Variance is a measure of the degree of dispersion when probability theory and statistical variance measure a random variable or a set of data. The variance in probability theory is used to measure the degree of deviation between a random variable and its mathematical expectation (i.e., mean). The variance in the statistics (sample variance) is the mean of the squared values of the difference between each sample value and the mean of the total sample values. In the statistical description, the variance is used to calculate the difference between each variable and the overall mean.
According to the definition of the overall variance, the larger the overall variance is, the larger the fluctuation amplitude of the data is; the smaller the variance, the smaller the fluctuation amplitude of the data. Therefore, the magnitude of the fluctuation amplitude of the capacitance voltage data of the super capacitor can be evaluated by using the overall variance.
The overall variance for each set of capacitance voltage data may be calculated according to equation (1) to obtain N overall variances.
Wherein the overall variance of each set of capacitance voltage data is calculated by the following equation:
wherein σi 2Representing the overall variance, k, of the ith set of capacitor voltage dataiIndicating the number of capacitor voltage data in the ith group of capacitor voltage data, XijRepresents the jth capacitor voltage data, mu, in the ith group of capacitor voltage dataiAnd the average value of the ith group of capacitance voltage data is expressed, wherein i is more than or equal to 1 and less than or equal to N.
From the viewpoint of detection performance and detection aging, kiMay be set to 10 or 20, that is, each of the N sets of capacitance voltage data may include 10 or 20 capacitance voltage data.
Because the total variance represents the degree of sample data deviating from the standard value, when abnormal conditions occur, such as power failure of a pitch control cabinet and interruption of field bus communication (detected by a master controller), the capacitance voltage of the super capacitor can be reduced to 0V, and the total variance of the acquired capacitance voltage data can be large, that is, the size of the total variance can reflect the generation reason of the capacitance voltage data abnormality, so that whether the capacitance voltage data has abnormal conditions or the reason of causing the capacitance voltage data abnormality can be determined according to the size of the total variance.
In step S120, the operating condition of the super capacitor is determined based on the maximum value of the N total variances and a predetermined value.
Since the size of the overall variance of the capacitor voltage data of the super capacitor can reflect whether the capacitor voltage is abnormal or not and the reason why the capacitor voltage is abnormal, whether the super capacitor has a fault or not can be judged based on the size of the overall variance.
As an example, whether the supercapacitor has a fault can be judged according to the size of the maximum value in the N overall variances.
Tens of thousands of capacitance voltage data files of a super capacitor of a specific wind generating set under a specific working condition are analyzed, specifically, 3000 capacitance voltage data acquired according to a time sequence are divided into 30 groups, each group comprises 100 capacitance voltage data, and the maximum value of N (equal to 30) total variance values is found to be 0V2(V2)-0.6V2When the super capacitor is normal, the maximum value of N total variance values is 0.6V2-1V2Then the super capacitor will fail, the most of the N total variance valuesLarge value of 1V2To 50V2The super capacitor body is abnormal; and the maximum value of the N total variance values is more than 1000V2In time, the super capacitor does not have a fault, but the data bus communication is abnormal or the power failure of the pitch control cabinet occurs. Furthermore, in the analysis it was found that by making N equal to a value other than 30, similar laws as described above also exist. Therefore, the working condition of the super capacitor can be determined based on the maximum value of the N overall variances and a preset value.
For ease of illustration, the following description is directed to the ultracapacitor for a particular wind generating set under the particular operating conditions described above.
As an example, when the maximum value is greater than a first threshold, it may be determined that the ultracapacitor is not faulty. For example, the first threshold may be set to 1000V2When the maximum value is greater than 1000V2It may be determined that there is no fault with the supercapacitor.
Fig. 3 is a diagram illustrating collected capacitance voltage data for a supercapacitor according to an embodiment of the disclosure. Referring to fig. 3, the abscissa represents sequential counts of the collected capacitance voltage data, and the ordinate represents the magnitude of the capacitance voltage corresponding to the abscissa counts. 3000 capacitance voltage data are acquired in time sequence, the 3000 capacitance voltage data are divided into 30 groups, each group comprises 100 capacitance voltage data, and the maximum value of N (equal to 30) total variances of the capacitance voltage data corresponding to the curve with the maximum fluctuation amplitude is 1043.707V2It can be determined that there is no fault with the supercapacitor corresponding to the curve, but rather a data bus communication interruption may have occurred.
Fig. 4 is a diagram illustrating collected capacitance voltage data according to another embodiment of the present disclosure. Similar to fig. 3, referring to fig. 4, the maximum value among N total variances of the capacitance voltage data corresponding to the curve having the maximum fluctuation width is 1166.55V2And determining that the super capacitor corresponding to the curve has no fault, and the power failure of the pitch control cabinet is possible.
As an example, a fault in the ultracapacitor may be determined when the maximum value is greater than a second threshold and less than a third threshold, wherein the firstThe second threshold and the third threshold are both smaller than the first threshold, and for example, the second threshold and the third threshold may be set to 1V, respectively2、50V2。
Fig. 5 is a diagram illustrating collected capacitance voltage data for a supercapacitor according to another embodiment of the present disclosure. Similar to fig. 3, referring to fig. 5, the maximum value of N total variances of the capacitance voltage data corresponding to the curve having the maximum fluctuation width is 16.3V2It can be determined that the supercapacitor corresponding to the curve has a fault.
By way of example, when it is determined that the super capacitor has a fault, information for reminding replacement of the super capacitor may be output.
As an example, it may be determined that the supercapacitor is about to fail when the maximum value is greater than a fourth threshold and less than a fifth threshold, wherein the fourth threshold and the fifth threshold are both less than or equal to the second threshold, for example, the fourth threshold and the fifth threshold may be respectively set to 0.6V2、1V2。
Fig. 6 is a diagram illustrating collected capacitance voltage data for a supercapacitor according to another embodiment of the present disclosure. Similar to fig. 3, referring to fig. 6, the maximum value among N total variances of the capacitance voltage data corresponding to the curve having the maximum fluctuation width is 0.872V2Indicating relatively small fluctuations in the capacitor voltage corresponding to the curve, it can be determined that the supercapacitor corresponding to the curve is about to fail.
By way of example, when it is determined that the super capacitor is about to fail, early warning information for reminding that the super capacitor is about to fail may be output.
For example, the supercapacitor may be determined to be free of a fault when the maximum value is greater than a sixth threshold and less than a seventh threshold, wherein the sixth threshold and the seventh threshold are both less than or equal to a fifth threshold, e.g., the sixth threshold and the seventh threshold may be set to 0V, respectively2、0.6V2。
FIG. 7 is a graph of collected capacitance voltage data for a supercapacitor according to another embodiment of the disclosure. Similar to FIG. 3, refer to FIG. 7, and haveThe maximum value of N total variances of the capacitance voltage data corresponding to the curve of the maximum fluctuation amplitude is 0.51V2The voltage of the capacitor corresponding to the curve is only slightly fluctuated, and the super capacitor corresponding to the curve can be determined to work normally without faults.
While the above description has been made with respect to the super capacitor of a particular wind park under particular operating conditions, it should be understood that, for the super capacitors of different wind parks, at least one of the above-mentioned first, second, third, fourth, fifth, sixth and seventh threshold values may have another value, and furthermore, a change of the operating conditions of the wind park may also be such that at least one of the above-mentioned threshold values has another value, for example, the change in the ambient temperature may also cause at least one of the first threshold, the second threshold, the third threshold, the fourth threshold, the fifth threshold, the sixth threshold, and the seventh threshold to have other values, and the different models of capacitance may also cause at least one of the first threshold, the second threshold, the third threshold, the fourth threshold, the fifth threshold, the sixth threshold, and the seventh threshold to have other values.
The method for detecting the working condition of the super capacitor according to the exemplary embodiment of the present invention has been described above with reference to fig. 1 to 7. Hereinafter, a super capacitor operation condition detection apparatus of a wind turbine generator set according to an exemplary embodiment of the present invention will be described with reference to fig. 8.
FIG. 8 is a block diagram illustrating a super capacitor condition detection apparatus 800 of a wind turbine generator set according to an exemplary embodiment of the present disclosure.
Referring to fig. 8, the supercapacitor duty detection device 800 may include a data acquisition unit 801, a calculation unit 802, and a duty determination unit 803.
The data obtaining unit 801 may obtain N sets of capacitance voltage data of the super capacitor in real time, the calculating unit 802 may calculate a total variance of each set of capacitance voltage data to obtain N total variances, and the operating condition determining unit 803 may determine an operating condition of the super capacitor based on a maximum value of the N total variances and a predetermined value.
The obtaining of the capacitor voltage data, the calculation of the total variance, and how to determine the working condition of the super capacitor based on the maximum value of the N total variances and the predetermined value have been described above, and details are not repeated herein.
As an example, the operating condition determining unit 803 may be configured to: determining that there is no fault with the supercapacitor when the maximum value is greater than a first threshold; when the maximum value is larger than a second threshold value and smaller than a third threshold value, determining that the super capacitor has a fault, wherein the second threshold value and the third threshold value are smaller than the first threshold value; when the maximum value is larger than a fourth threshold value and smaller than a fifth threshold value, determining that the super capacitor is about to fail, wherein the fourth threshold value and the fifth threshold value are both smaller than or equal to a second threshold value; and when the maximum value is larger than a sixth threshold and smaller than a seventh threshold, determining that the super capacitor has no fault, wherein the sixth threshold and the seventh threshold are both smaller than or equal to a fifth threshold.
As an example, the super capacitor working condition detection apparatus 800 may further include a replacement reminding unit and a fault warning unit (not shown).
As an example, the reminding replacing unit may be configured to output information for reminding replacing the super capacitor when the working condition determining unit 803 determines that the super capacitor has a fault.
As an example, the fault early warning unit may be configured to output early warning information for reminding that the super capacitor is about to fail when the operating condition determining unit 803 determines that the super capacitor is about to fail.
By way of example, the supercapacitor condition detection device 800 may be provided in a pitch controller of a wind turbine generator system.
As described above, according to the exemplary embodiments of the present invention, whether a super capacitor of a wind turbine generator system of a super capacitor has a fault is determined based on the overall variance of voltage data of the super capacitor of the wind turbine generator system, and a fault cause causing a capacitor voltage of the super capacitor to be abnormal can be conveniently determined, so that the workload of a worker for troubleshooting can be reduced, and the fault processing time can be reduced.
Exemplary embodiments of the present invention provide a computer-readable storage medium storing a computer program, which when executed by a processor implements the supercapacitor duty detection method according to the above exemplary embodiments. The computer readable storage medium is any data storage device that can store data which can be read by a computer system. Examples of computer-readable storage media include: read-only memory, random access memory, read-only optical disks, magnetic tapes, floppy disks, optical data storage devices, and carrier waves (such as data transmission through the internet via wired or wireless transmission paths).
The supercapacitor working condition detection device according to the exemplary embodiment of the invention may include: the device comprises a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the method for detecting the working condition of the super capacitor is realized.
Although a few exemplary embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (11)
1. A method for detecting the working condition of a super capacitor of a wind generating set comprises the following steps:
acquiring N groups of capacitor voltage data of the super capacitor in real time;
calculating the overall variance of each group of capacitance voltage data to obtain N overall variances; and the number of the first and second groups,
and determining the working condition of the super capacitor based on the maximum value of the N total variances and a preset value.
2. The method of claim 1, wherein determining the operating condition of the ultracapacitor based on a maximum of the N population variances and a predetermined value comprises:
determining that the ultracapacitor is not faulty when the maximum value is greater than a first threshold, the predetermined value comprising a first threshold.
3. The method of claim 2, wherein determining the operating condition of the ultracapacitor based on a maximum of the N population variances and a predetermined value further comprises:
determining that the supercapacitor is faulty when the maximum value is greater than a second threshold value and less than a third threshold value,
the predetermined value further comprises a second threshold and a third threshold, and both the second threshold and the third threshold are smaller than the first threshold.
4. The method of claim 3, wherein determining the operating condition of the ultracapacitor based on a maximum of the N population variances and a predetermined value further comprises:
determining that the supercapacitor is about to fail when the maximum value is greater than a fourth threshold value and less than a fifth threshold value,
the predetermined value further includes a fourth threshold and a fifth threshold, and both the fourth threshold and the fifth threshold are less than or equal to the second threshold.
5. The method of claim 4, further comprising: when the super capacitor is determined to be in fault, outputting early warning information for reminding the super capacitor of being in fault; and/or the presence of a gas in the gas,
and when the super capacitor is determined to have a fault, outputting information for reminding of replacing the super capacitor.
6. The method of claim 5, wherein determining the operating condition of the ultracapacitor based on a maximum of the N population variances and a predetermined value further comprises:
determining that there is no fault with the supercapacitor when the maximum value is greater than a sixth threshold and less than a seventh threshold,
the preset value further comprises a sixth threshold and a seventh threshold, and the sixth threshold and the seventh threshold are both smaller than or equal to the fifth threshold.
7. A super capacitor working condition detection device of a wind generating set, the device comprises:
the data acquisition unit is configured to acquire N groups of capacitor voltage data of the super capacitor in real time;
a calculation unit configured to calculate a global variance of each set of the capacitance voltage data to obtain N global variances; and
an operating condition determining unit configured to determine an operating condition of the supercapacitor based on a maximum value of the N population variances and a predetermined value.
8. The apparatus of claim 7, wherein the operating condition determining unit is configured to:
determining that there is no fault with the supercapacitor when the maximum value is greater than a first threshold;
when the maximum value is larger than a second threshold value and smaller than a third threshold value, determining that the super capacitor has a fault, wherein the second threshold value and the third threshold value are smaller than the first threshold value;
when the maximum value is larger than a fourth threshold value and smaller than a fifth threshold value, determining that the super capacitor is about to fail, wherein the fourth threshold value and the fifth threshold value are both smaller than or equal to a second threshold value;
determining that the ultracapacitor is not faulty when the maximum value is greater than a sixth threshold and less than a seventh threshold, wherein the sixth threshold and the seventh threshold are both less than or equal to a fifth threshold,
wherein the predetermined values include a first threshold, a second threshold, a third threshold, a fourth threshold, a fifth threshold, a sixth threshold, and a seventh threshold.
9. The apparatus of claim 8, further comprising:
the reminding replacing unit is configured to output information for reminding of replacing the super capacitor when the working condition determining unit determines that the super capacitor has a fault;
and the fault early warning unit is configured to output early warning information for reminding that the super capacitor is about to fail when the working condition determining unit determines that the super capacitor is about to fail.
10. The apparatus of claim 9, the apparatus being disposed in a pitch controller of a wind turbine generator set.
11. A computer-readable storage medium, in which a computer program is stored which, when executed, implements the method of any of claims 1 to 6.
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