Generator rotating speed-winding voltage characteristic detection method and device

Abstract

The invention relates to a generator speed-winding voltage characteristic detection method and device. The method comprises the following steps: in a no-load operation state of the generator, calculating a ratio of a rotating speed variation to a winding voltage variation of the generator based on a preset voltage acquisition interval, so as to construct a ratio sequence of the rotating speed variation to the winding voltage variation; the average value of the (2n-1) th ratio and the (2n-2) th ratio in the ratio sequence is determined, n is an integer larger than or equal to 2 and smaller than or equal to (N + 1) / 2, and N is the number of the ratios in the ratio sequence; in response to the fact that the average values are equal to each other, it is determined that the rotating speed-winding voltage characteristic curve meets the linear relation, otherwise, it is determined that the rotating speed-winding voltage characteristic curve does not meet the linear relation, and whether the rotating speed-winding voltage characteristic curve of the generator meets the linear relation or not represents whether the rotating speed-winding voltage characteristic of the generator is normal or not. According to the invention, automatic detection of rotating speed-winding voltage characteristics can be realized.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wind power generation, and more specifically, to a method and device for detecting generator speed-winding voltage characteristics. Background Art

[0002] No-load characteristic is a basic characteristic of the generator. The no-load characteristic test is a test to measure the relationship between the stator voltage and the rotor current of the generator under no-load and rated speed conditions. Its purpose is to: determine the relevant characteristic parameters of the generator, such as voltage change rate, longitudinal axis synchronous reactance, short-circuit ratio and load characteristics; use the readings of the three-phase voltmeter to judge the symmetry of the three-phase voltage; conduct the stator winding interlayer withstand voltage test in combination with the no-load test; compare the measurement results, which can be used as a reference for analyzing whether the rotor has interlayer short circuit. Through the no-load characteristic test, not only can the working condition of the generator excitation system be checked, the saturation degree of the generator magnetic circuit can be observed, and whether the connection between the generator stator and rotor is correct can be checked, and the relevant parameters of the generator can also be obtained through it. In addition, through the no-load inspection test of the generator, the starting performance of the motor, the vibration of the motor, the sound condition, the operating status of the bearings and brushes, and the assembly quality of the motor (repair), etc. can be checked, and these parameters can be reflected by the electrical parameters of the generator, among which the most important parameters are the generator speed and winding voltage. Therefore, testing the speed-winding voltage characteristics of the generator is an important measure to ensure the performance and quality of the generator and improve the reliability of wind turbine operation. Summary of the invention

[0003] The present disclosure provides a generator speed-winding voltage characteristic detection method and device, a computing system and a computer-readable storage medium.

[0004] According to one aspect of the present disclosure, a generator speed-winding voltage characteristic detection method is provided, the generator speed-winding voltage characteristic detection method comprising: in a no-load running state of the generator, based on a preset voltage collection interval, calculating the ratio of the generator speed change to the winding voltage change, thereby constructing a ratio sequence of the speed change to the winding voltage change; determining the average value of the 2n-1th ratio and the 2n-2th ratio in the ratio sequence, wherein n is an integer greater than or equal to 2 and less than or equal to (N+1) / 2, and N is the number of ratios in the ratio sequence; in response to the determined average values ​​being equal to each other, determining that the speed-winding voltage characteristic curve of the generator satisfies a linear relationship, wherein the speed-winding voltage characteristic curve of the generator satisfies the linear relationship, indicating that the speed-winding voltage characteristic of the generator is normal; in response to the determined average values ​​not being equal to each other, determining that the speed-winding voltage characteristic curve of the generator does not satisfy the linear relationship, wherein the speed-winding voltage characteristic curve of the generator does not satisfy the linear relationship, indicating that the speed-winding voltage characteristic of the generator is abnormal.

[0005] Optionally, during a speed increase period of the generator or a predetermined detection period when the generator is in a no-load operation state, the ratio of the speed change of the generator to the winding voltage change is continuously calculated based on a preset voltage collection interval.

[0006] Optionally, the generator speed-winding voltage characteristic detection method also includes: before determining the average value of the 2n-1th ratio and the 2n-2th ratio in the ratio sequence, in response to the ratios in the ratio sequence being equal to each other, determining that the generator speed-winding voltage characteristic curve is a straight line.

[0007] Optionally, the generator speed-winding voltage characteristic detection method further includes: before calculating the ratio of the generator speed change to the winding voltage change, filtering the generator winding voltage and speed using the same filtering algorithm and filtering time window.

[0008] Optionally, in response to the determined average values ​​being equal to each other, determining that the speed-winding voltage characteristic curve of the generator satisfies a linear relationship includes: in response to the determined average values ​​being equal to each other and equal to the average value of all ratios in the ratio sequence, determining that the speed-winding voltage characteristic curve of the generator satisfies a linear relationship.

[0009] Optionally, calculating the ratio of the generator speed change to the winding voltage change includes: calculating the ratio of the absolute value of the generator speed change to the winding voltage change.

[0010] According to another aspect of the present disclosure, a generator speed-winding voltage characteristic detection device is provided, and the generator speed-winding voltage characteristic detection device includes: a ratio sequence determination unit, which is used to calculate the ratio of the speed change amount of the generator to the winding voltage change amount based on a preset voltage collection interval when the generator is in a no-load operation state, thereby constructing a ratio sequence of the speed change amount and the winding voltage change amount; an average value determination unit, which is used to determine the average value of the 2n-1th ratio and the 2n-2th ratio in the ratio sequence, wherein n is an integer greater than or equal to 2 and less than or equal to (N+1) / 2, N is the number of ratios in the ratio sequence; the speed-winding voltage characteristic detection unit, in response to the determined average values ​​being equal to each other, determines that the speed-winding voltage characteristic curve of the generator satisfies a linear relationship, wherein the speed-winding voltage characteristic curve of the generator satisfies the linear relationship, indicating that the speed-winding voltage characteristic of the generator is normal; in response to the determined average values ​​being not equal to each other, determines that the speed-winding voltage characteristic curve of the generator does not satisfy the linear relationship, wherein the speed-winding voltage characteristic curve of the generator does not satisfy the linear relationship, indicating that the speed-winding voltage characteristic of the generator is abnormal.

[0011] Optionally, the ratio sequence determination unit is configured to continuously calculate the ratio of the generator speed change to the winding voltage change based on a preset voltage collection interval during a speed increase time period or a predetermined detection time period when the generator is in a no-load operation state.

[0012] Optionally, the average value determination unit is configured to: before determining the average value of the 2n-1th ratio and the 2n-2th ratio in the ratio sequence, in response to the ratios in the ratio sequence being equal to each other, determine that the speed-winding voltage characteristic curve of the generator is a straight line.

[0013] Optionally, the ratio sequence determination unit is configured to: before calculating the ratio of the speed change of the generator to the winding voltage change, filter the winding voltage and speed of the generator using the same filtering algorithm and filtering time window.

[0014] Optionally, the speed-winding voltage characteristic detection unit is configured to: in response to the determined average values ​​being equal to each other and equal to the average value of all ratios in the ratio sequence, determine that the speed-winding voltage characteristic curve of the generator satisfies a linear relationship.

[0015] Optionally, calculating the ratio of the generator speed change to the winding voltage change includes: calculating the ratio of the absolute value of the generator speed change to the winding voltage change.

[0016] According to another aspect of the present disclosure, a computing system is provided that includes at least one computing device and at least one storage device storing instructions, wherein the instructions, when executed by the at least one computing device, prompt the at least one computing device to execute the generator speed-winding voltage characteristic detection method as described above.

[0017] According to another aspect of the present disclosure, a computer-readable storage medium storing instructions is provided, wherein when the instructions are executed by at least one computing device, the at least one computing device is prompted to execute the generator speed-winding voltage characteristic detection method as described above.

[0018] By adopting the present disclosure, automatic detection of the generator speed-winding voltage characteristic can be achieved, and the data mutation of the generator speed-winding voltage characteristic can be effectively detected, so as to determine whether the design of the generator is reasonable and whether there is a fault in the generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or other objects and advantages of the present disclosure will become more apparent through the following description of embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1is a flow chart showing a generator speed-winding voltage characteristic detection method according to an exemplary embodiment of the present disclosure;

[0021] Figure 2 is a schematic diagram showing a generator speed-winding voltage curve according to an example;

[0022] Figure 3 is a graph schematically illustrating a step of determining a ratio of a speed change amount to a winding voltage change amount of a generator according to an exemplary embodiment of the present disclosure;

[0023] Figure 4 is a schematic diagram showing the principle of a generator speed-winding voltage characteristic detection method according to an exemplary embodiment of the present disclosure;

[0024] Figure 5 is a graph showing a ratio sequence satisfying a linear relationship according to an example of the present disclosure;

[0025] Fig. 6A and Figure 6B are graphs showing a rotation speed-winding voltage curve and a ratio sequence that do not satisfy a linear relationship according to an example;

[0026] Fig. 7A and Figure 7B are graphs showing a rotation speed-winding voltage curve and a ratio sequence that do not satisfy a linear relationship according to another example;

[0027] Figure 8 is a flow chart showing a generator speed-winding voltage characteristic detection method according to an example;

[0028] Fig. 9 is a block diagram showing a generator speed-winding voltage characteristic detection device according to an exemplary embodiment of the present disclosure;

[0029] Fig.10 is a block diagram illustrating a computing system including at least one computing device and at least one storage device storing instructions according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] Below, in conjunction with the accompanying drawings, a description of a specific embodiment is provided to help the reader obtain a comprehensive understanding of the method, device and / or system described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the method, device and / or system described herein will be clear. For example, the order of operations described herein is only an example and is not limited to those orders set forth herein, but can be changed as will be clear after understanding the disclosure of the present application, except for operations that must occur in a specific order. In addition, for greater clarity and simplicity, the description of features known in the art may be omitted.

[0031] The no-load characteristic is one of the basic characteristics of the generator. It is a test to measure the relationship between the stator voltage and the rotor current at no-load and rated speed. Through this test, the important parameters of the generator (such as voltage change rate, longitudinal axis synchronous reactance, short-circuit ratio, etc.) can be determined, the balance of the three-phase voltage can be judged, and it can be used as a reference for whether the rotor has inter-turn short circuit. It can also detect the inter-layer withstand voltage of the stator winding.

[0032] The relationship between the power, torque and speed of the generator is derived as shown in the following equation (1):

[0033] P=F*V (1)

[0034] In equation (1), P represents power, F represents torque, and V represents linear speed.

[0035] Since the torque T is equal to the torque F multiplied by the effective radius R, equation (2) can be obtained as follows:

[0036] F=T / R (2)

[0037] In addition, according to the relationship between the linear velocity V, the effective radius R and the rotation speed n (in revolutions per minute), equation (3) can be obtained as follows:

[0038] V=π*R*n / 30 (3)

[0039] Substituting equations (2) and (3) into equation (1) yields equation (4), as shown below:

[0040] P=F*V=(T / R)*(π*R*n / 30)=π*T*n / 30 (4)

[0041] Furthermore, if the unit of power is kW, according to equation (4), 9549.297*P=T*n can be obtained.

[0042] It can be seen that when the generator is running at no-load, the load of the generator is constant, so the current of the generator is constant. Therefore, in theory, when the torque T is constant, the generator speed n is proportional to the winding voltage. Therefore, the rationality of the design of the generator, the symmetry of the three-phase winding of the generator, and whether there is a fault in the excitation system can be determined based on whether the generator speed and winding voltage measured when the generator is running at no-load present a linear relationship (when there is a first-order function relationship between two variables, there is a linear relationship between them).

[0043] Existing methods for detecting whether there is a linear relationship between two variables include slope judgment, detection of linear correlation coefficient, manual drawing observation, and high-level language drawing. Among them, slope judgment is only applicable to ideal values, while the actual operating data of the generator is usually not an ideal integer and the collected data has a certain degree of fluctuation, so the slope method cannot be used for detection. The disadvantages of using the correlation coefficient are: the degree to which the correlation coefficient r is close to 1 is related to the number of data n. The more data there are, the larger the detected result (approaching 1), which is easy to cause false detection; the correlation coefficient is easily affected by abnormal values, that is, accidental data jumps may make the data correlation coefficient r very small, which is also easy to cause false judgment; the linear correlation coefficient reflects the correlation relationship between the two arrays, that is, if the two data are related but not in a purely proportional relationship (such as regular curve changes), the calculated correlation coefficient value r will also be high. For manual drawing observation, it is necessary to draw a coordinate curve diagram and observe manually. Although this method can make effective judgments, it requires collecting, recording, and exporting data, with many operation steps, and the deviation of recognition and understanding will have a subjective impact on the results. Although the use of high-level language drawing methods can achieve automatic drawing, it still requires human observation, making it difficult to achieve intelligent detection systems.

[0044] Based on the above reasons, the present disclosure proposes a generator speed-winding voltage characteristic detection method and device, which can automatically analyze and judge the operation status of the actuator through detection procedures and algorithms, thereby improving the intelligence of the detection system and the compliance of the detection process.

[0045] Figure 1 is a flow chart illustrating a method for detecting a generator speed-winding voltage characteristic according to an exemplary embodiment of the present disclosure.

[0046] like Figure 1 As shown, in step S101, when the generator is in no-load operation state, based on the preset voltage collection interval, the ratio of the generator speed change to the winding voltage change is calculated, thereby constructing a ratio sequence of the speed change to the winding voltage change.

[0047] In the example, a high-speed pulse detection module and a proximity switch can be used to measure the generator speed, and a voltage acquisition module and a voltage transformer (or other voltage acquisition equipment) can be used to measure the generator winding voltage. In the example, during the generator speed increase time period or the predetermined detection time period when the generator is in a no-load operation state, the ratio of the generator speed change to the winding voltage change is continuously calculated based on the preset voltage acquisition interval. In the example, the absolute value of the generator speed change can be calculated, and the ratio of the absolute value to the winding voltage change can be calculated.

[0048] In step S102, the average value of the 2n-1th ratio and the 2n-2th ratio in the ratio sequence is determined, wherein n is an integer greater than or equal to 2 and less than or equal to (N+1) / 2, and N is the number of ratios in the ratio sequence. For example, when the number of ratios in the ratio sequence is 7, n may be equal to 2, 3, or 4, that is, the average value of the 2nd ratio and the 3rd ratio, the average value of the 4th ratio and the 5th ratio, and the average value of the 6th ratio and the 7th ratio may be calculated. For another example, when the number of ratios in the ratio sequence is 8, n is an integer greater than or equal to 2 and less than or equal to 4.5, that is, n may be equal to 2, 3, or 4, in which case the average value of the 2nd ratio and the 3rd ratio, the average value of the 4th ratio and the 5th ratio, and the average value of the 6th ratio and the 7th ratio may be calculated. Through step S102, the first ratio in the ratio sequence can be ignored. The reason is that the first ratio of the speed change to the winding voltage change has no previously calculated data as a reference. Ignoring the first ratio in the ratio sequence can ensure the accuracy of data analysis of the ratio sequence.

[0049] In step S103, it is determined whether the determined average values ​​are equal to each other. If it is determined in step S103 that the determined average values ​​are equal to each other, then in step S104, it is determined that the speed-winding voltage characteristic curve of the generator satisfies a linear relationship, wherein the speed-winding voltage characteristic curve of the generator satisfies a linear relationship, indicating that the speed-winding voltage characteristic of the generator is normal. If it is determined in step S103 that the determined average values ​​are not equal to each other, then in step S105, it is determined that the speed-winding voltage characteristic curve of the generator does not satisfy a linear relationship, wherein the speed-winding voltage characteristic curve of the generator does not satisfy a linear relationship, indicating that the speed-winding voltage characteristic of the generator is abnormal.

[0050] In addition, before determining the average value of the 2n-1th ratio and the 2n-2th ratio in the ratio sequence, the speed-winding voltage characteristic curve of the generator can be determined to be a straight line in response to the ratios in the ratio sequence being equal to each other. In addition, before calculating the ratio of the speed change of the generator to the winding voltage change, the same filtering algorithm and filtering time window can be used to filter the winding voltage and speed of the generator. By using the same filtering algorithm and filtering time window, not only can tiny data jitters be filtered out to ensure the correctness of the detection, but filtering according to the same parameters will not affect the data relationship between the generator speed value and the winding voltage value. In another example, in response to the determined average values ​​being equal to each other and equal to the average value of all ratios in the ratio sequence, it is determined that the speed-winding voltage characteristic curve of the generator satisfies a linear relationship. As a result, the speed and winding voltage data can be further and more comprehensively detected.

[0051] The generator speed-winding voltage characteristic detection method according to the exemplary embodiment of the present disclosure can realize the automatic detection of the generator speed-winding voltage characteristic, and effectively detect the data mutation of the generator speed-winding voltage characteristic, so as to determine whether the design of the generator is reasonable, the symmetry of the three-phase winding of the generator, and whether there is a fault in the excitation system.

[0052] Figure 2 is a schematic diagram showing a generator speed-winding voltage curve according to an example, Figure 3 is a graph schematically illustrating a step of determining a ratio of a speed change amount of a generator to a winding voltage change amount according to an exemplary embodiment of the present disclosure, and Figure 4 is a schematic diagram illustrating the principle of a generator speed-winding voltage characteristic detection method according to an exemplary embodiment of the present disclosure.

[0053] like Figure 2 As shown, the generator speed-winding voltage curve according to the example is not an ideal straight line, but has a certain degree of fluctuation. Figure 3 In the equation, the horizontal axis represents the winding voltage and the vertical axis represents the generator speed. Figure 3 As shown, coordinate points (V1, N1), (V2, N2), (V3, N3) are selected according to the predetermined voltage interval, and the ratios of the vertical coordinate change to the horizontal coordinate change (N2-N1) / (V2-V1) and (N3-N2) / (V3-V2), that is, the ratio of the generator speed change to the winding voltage change, are calculated. Figure 3 Only three coordinate points are selected, but it should be understood that more coordinate points can be selected and the ratio of the vertical coordinate change to the horizontal coordinate change can be calculated in a similar way.

[0054] Refer to the following Figure 4 To illustrate the principle of a generator speed-winding voltage characteristic detection method according to an exemplary embodiment of the present disclosure.

[0055] exist Figure 4 In the example, set coordinate point A to (x1, y1), coordinate point B to (x2, y2), the rate of change from the origin to coordinate point A is (y1-0) / (x1-0), and the rate of change from coordinate point A to coordinate point B is (y2-y1) / (x2-x1). If the change in the horizontal coordinate from the origin to coordinate point A is equal to the change in the horizontal coordinate from coordinate point A to coordinate point B, then (x2-x1) = (x1-0).

[0056] Calculate the average of the rate of change from the origin to coordinate point A and the rate of change from coordinate point A to coordinate point B:

[0057]

[0058] It can be seen from the above equation (5) that, in the case of equal intervals of the horizontal coordinates, the change from the origin to coordinate point A and the change from coordinate point A to coordinate point B will return to the change from the origin to coordinate point B. The generator speed-winding voltage characteristic detection method according to the exemplary embodiment of the present disclosure utilizes this feature to realize automatic detection and discrimination of the generator speed-winding voltage curve.

[0059] Figure 5 is a graph showing a ratio sequence satisfying a linear relationship according to an example of the present disclosure.

[0060] exist Figure 5 In the figure, the ordinate represents the ratio of the generator speed change (or the absolute value of the generator speed change) to the winding voltage change, and the abscissa represents the sequence number in the ratio sequence. In combination with the contents in Table 1, it can be seen that in the generator speed-winding voltage characteristic detection method according to the exemplary embodiment of the present disclosure, every two adjacent ratios starting from the second ratio in the ratio sequence are averaged (for example, (0.2+0.8) / 2=0.5, (0.3+0.7) / 2=0.5, (0.4+0.6) / 2=0.5), and the generator speed-winding voltage curve is determined based on the calculated average value to determine whether it satisfies the linear relationship.

[0061] Table 1

[0062]

[0063]

[0064] Fig. 6A and Figure 6B 1 and 2 are graphs showing a speed-winding voltage curve and a ratio sequence that do not satisfy a linear relationship according to an example. Figure 6B In the figure, the ordinate represents the ratio of the generator speed change (or the absolute value of the generator speed change) to the winding voltage change, and the abscissa represents the sequence number in the ratio sequence. Fig. 6A and Figure 6B As shown in Table 2, if the data mutates, the mean results are no longer continuously equal, but a mutation of 3.5 occurs.

[0065] Table 2

[0066]

[0067] Fig. 7A and Figure 7B Graphs showing a rotation speed-winding voltage curve and a ratio sequence that do not satisfy a linear relationship according to another example, respectively.

[0068] exist Figure 7B In FIG. 7A , the ordinate represents the ratio of the generator speed change (or the absolute value of the generator speed change) to the winding voltage change, and the abscissa represents the sequence number in the ratio sequence. The speed-winding voltage curve shown in FIG. 7A is a curve with an arc. In this case, the generator speed-winding voltage characteristic detection method according to the exemplary embodiment of the present disclosure can be used to obtain Figure 7B From the results shown in Table 3, it can be seen that the average value obtained is not a constant value.

[0069] Table 3

[0070]

[0071] Figure 8 is a flow chart showing a generator speed-winding voltage characteristic detection method according to an example.

[0072] like Figure 8 As shown, in step S801, the voltage collection interval is set to xV (for example, the value of x includes but is not limited to 0.5, 1, 2, 10, 15, etc., that is, the voltage collection interval value includes but is not limited to 0.5V, 1V, 2V, 10V, 15V, etc.), and the speed and winding voltage value of the generator are collected when the generator is running at no load. Specifically, after starting the generator to run at no load, the winding voltage value of the generator can be collected, and the speed value can be collected at a preset voltage collection interval. For example, the generator speed value is collected and read once every time the winding voltage increases by 1V.

[0073] In step S802, it is determined whether the voltage collection interval has been reached. Regarding the voltage collection interval, a specific threshold range can be set for it. For example, when the preset voltage collection interval is xV, the voltage within the range of xV±a (for example, a can be equal to 0.2V) can be detected during detection, because the collected voltage value is generally a floating point number and will not be exactly equal to x.00V. It should be understood that the above description is only an example, and the preset voltage collection interval and the specific threshold range can be set to any other reasonable value as needed. If it is determined in step S802 that the voltage collection interval has been reached, step S803 is executed. In step S803, according to the speed and winding voltage value at this moment, the rate of change compared with the previous moment (that is, the ratio of the absolute value of the difference between the speed at this moment and the speed at the previous moment to the preset voltage collection interval) is calculated and saved.

[0074] Next, in step S804, determine whether the data collection time has expired. The data collection time can be the rise time of the generator speed value or the preset detection operation time. If it is determined in step S804 that the predetermined data collection time has not expired, return to step S802. If it is determined in step S804 that the predetermined data collection time has expired, proceed to step S805. In step S805, retrieve the saved sequence (or ratio sequence) of the rate of change (i.e., the ratio of the speed change of the generator (or the absolute value of the speed change of the generator) to the winding voltage change), perform data analysis, and eliminate the first rate of change in the sequence (as shown in Tables 1 to 3, the ratio of the first change does not participate in the calculation of the average value).

[0075] In step S806, it is determined whether the magnitudes of the two preceding and following values ​​in the rate of change sequence have changed continuously. If it is determined in step S806 that the magnitudes of the two preceding and following values ​​in the rate of change sequence have not changed continuously, it is determined in step S811 whether the various values ​​are equal. If it is determined in step S811 that the various values ​​are equal (i.e., the ratio of the calculated speed change of the generator (or the absolute value of the speed change of the generator) to the winding voltage change is equal), it is determined in step S812 that the speed-winding voltage characteristic curve is a straight line (a special case of satisfying a linear relationship). If it is determined in step S811 that the various values ​​are not equal or it is determined in step S806 that the magnitudes of the two preceding and following values ​​in the rate of change sequence have changed continuously, it proceeds to step S807. In the case where it is determined that the magnitudes of the two preceding and following values ​​in the rate of change sequence have not changed continuously and it is determined that the various values ​​are not equal, for adjacent values ​​of equal magnitude in the rate of change sequence, only one of them can be taken for average value calculation to ensure the correctness of the timing sequence.

[0076] In step S807, the average value of the 2n-1th ratio and the 2n-2th ratio in the ratio sequence is calculated, where n is an integer greater than or equal to 2 and less than or equal to (N+1) / 2, and N is the number of ratios in the ratio sequence. In step S808, it is determined whether the calculated average values ​​are all equal. If it is determined in step S808 that the calculated average values ​​are all equal, then the process proceeds to step S809, otherwise it is determined that the speed-winding voltage characteristic curve does not satisfy the linear relationship and the process ends. In step S809, it is determined whether the calculated average value is equal to the average value of all data in the ratio sequence, in order to further test all data. If it is determined in step S809 whether the calculated average value is equal to the average value of all data in the ratio sequence, then in step S810 it is determined that the speed-winding voltage characteristic curve satisfies the linear relationship.

[0077] It should be understood by those skilled in the art that Figure 8The generator speed-winding voltage characteristic detection method shown is only an example and can be adjusted as needed. Figure 8 The order of the steps shown in the figure may be changed or certain steps (eg, step S809) may be omitted.

[0078] pass Figure 8 The generator speed-winding voltage characteristic detection method shown can realize the automatic detection of the generator speed-winding voltage characteristic, and identify and judge through algorithms, replacing the workload of human detection, observation and judgment. Based on the result of whether the speed-winding voltage characteristic curve satisfies the linear relationship, it can be determined whether the design of the generator is reasonable, the symmetry of the three-phase winding, and whether there is a fault in the excitation system.

[0079] Fig. 9 is a block diagram illustrating a generator speed-winding voltage characteristic detection device according to an exemplary embodiment of the present disclosure.

[0080] like Fig. 9 As shown, according to an exemplary embodiment of the present disclosure, a generator speed-winding voltage characteristic detection device 900 includes: a ratio sequence determination unit 901, which is used to calculate the ratio of the generator speed change to the winding voltage change based on a preset voltage collection interval when the generator is in a no-load operation state, thereby constructing a ratio sequence of the speed change to the winding voltage change; an average value determination unit 902, which is used to determine the average value of the 2n-1th ratio and the 2n-2th ratio in the ratio sequence, wherein n is an integer greater than or equal to 2 and less than or equal to (N+1) / 2, and N is the ratio sequence. The number of ratios in the ratio; the speed-winding voltage characteristic detection unit 903, in response to the determined average values ​​being equal to each other, determines that the speed-winding voltage characteristic curve of the generator satisfies a linear relationship, wherein the speed-winding voltage characteristic curve of the generator satisfies the linear relationship, indicating that the speed-winding voltage characteristic of the generator is normal; in response to the determined average values ​​being not equal to each other, determines that the speed-winding voltage characteristic curve of the generator does not satisfy the linear relationship, wherein the speed-winding voltage characteristic curve of the generator does not satisfy the linear relationship, indicating that the speed-winding voltage characteristic of the generator is abnormal.

[0081] In the example, the ratio sequence determination unit 901 is configured to: in the speed increase time period of the generator in the no-load running state of the generator or in the predetermined detection time period, based on the preset voltage acquisition interval, continuously calculate the ratio of the speed change of the generator to the winding voltage change. In the example, the average value determination unit 902 is configured to: before determining the average value of the 2n-1th ratio and the 2n-2th ratio in the ratio sequence, in response to the ratios in the ratio sequence being equal to each other, determine that the speed-winding voltage characteristic curve of the generator is a straight line. In the example, the ratio sequence determination unit 901 is configured to: before calculating the ratio of the speed change of the generator to the winding voltage change, use the same filtering algorithm and filtering time window to filter the winding voltage and speed of the generator. In the example, the speed-winding voltage characteristic detection unit 903 is configured to: in response to the determined average values ​​being equal to each other and equal to the average value of all ratios in the ratio sequence, determine that the speed-winding voltage characteristic curve of the generator satisfies a linear relationship. In an example, calculating the ratio of the speed change of the generator to the winding voltage change includes: calculating the ratio of the absolute value of the speed change of the generator to the winding voltage change.

[0082] Combination of the above Figures 1 to 8 The specific operations shown are respectively Fig. 9 The generator speed-winding voltage characteristic detection device 900 is executed by the corresponding units in the generator speed-winding voltage characteristic detection device 900 shown in the figure, and the specific operation details will not be repeated here. The generator speed-winding voltage characteristic detection device according to the exemplary embodiment of the present disclosure can realize the automatic detection of the generator speed-winding voltage characteristic, and effectively detect the data mutation of the generator speed-winding voltage characteristic, so as to determine whether the design of the generator is reasonable, the symmetry of the three-phase winding of the generator, and whether there is a fault in the excitation system.

[0083] Fig.10 is a block diagram illustrating a computing system including at least one computing device and at least one storage device storing instructions according to an exemplary embodiment of the present disclosure.

[0084] like Fig.10 As shown, the computing system 1000 provided according to an exemplary embodiment of the present invention includes a computing device 1001 and a storage device 1002, wherein the storage device 1002 stores computer executable instructions. When the computer executable instructions are executed by the computing device 1001, the generator speed-winding voltage characteristic detection method described in any of the aforementioned embodiments is executed.

[0085] The computing device 1001 is deployed in a server or client, and may also be deployed on a node device in a distributed network environment. In addition, the computing device 1001 may be a PC computer, a tablet device, a personal digital assistant, a smart phone, a web application or other device capable of executing the above-mentioned instruction set. Here, the computing device is not necessarily a single computing device, but may also be any device or circuit capable of executing the above-mentioned instruction (or instruction set) individually or jointly. The computing device may also be a part of an integrated control system or a system manager, or may be configured as a portable electronic device interconnected with an interface locally or remotely (e.g., via wireless transmission). In the computing device, the processor includes a central processing unit (CPU), a graphics processing unit (GPU), a programmable logic device, a dedicated processor system, a microcontroller or a microprocessor. As an example and not limitation, the processor also includes an analog processor, a digital processor, a microprocessor, a multi-core processor, a processor array, a network processor, etc.

[0086] According to another aspect of the present disclosure, a computer-readable storage medium storing instructions is provided, and when the instructions are executed by at least one computing device, the at least one computing device is prompted to execute the generator speed-winding voltage characteristic detection method described in any of the above embodiments. Computer-readable storage media include magnetic media such as floppy disks and tapes, optical media (including compact disk (CD) ROM and DVD ROM), magneto-optical media such as floppy disks, hardware devices such as ROM, RAM and flash memory designed to store and execute program commands. The instructions may include language codes executable by a computer using an interpreter and machine language codes generated by a compiler.

[0087] By adopting the present disclosure, automatic detection of the generator speed-winding voltage characteristic can be achieved, and the data mutation of the generator speed-winding voltage characteristic can be effectively detected, so as to determine whether the design of the generator is reasonable and whether there is a fault in the generator.

[0088] The processes, methods or algorithms disclosed herein may be transmitted to or implemented by a processing device, a controller or a computer, which may include any existing programmable electronic control unit or a dedicated electronic control unit. Similarly, the processes, methods or algorithms may be stored in a variety of forms as data and instructions that can be executed by a controller or a computer, including but not limited to information being permanently stored on a non-writable storage medium (such as a ROM device) and information being variably stored on a writable storage medium (such as a floppy disk, a tape, a CD, a RAM device, and other magnetic and optical media). The processes, methods or algorithms may also be implemented in a software executable object. Optionally, the processes, methods or algorithms may be implemented in whole or in part using suitable hardware components (such as an ASIC, an FPGA, a state machine, a controller or other hardware components or devices) or a combination of hardware components, software components and firmware components.

[0089] Although the present disclosure includes specific examples, it will be apparent to those of ordinary skill in the art that various changes in form and detail may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein will be considered to be descriptive only and not for limiting purposes. The description of the features or aspects in each example will be considered to be applicable to similar features or aspects in other examples. Suitable results may be obtained if the described techniques are performed in a different order, and / or if the components in the described systems, architectures, devices, or circuits are combined in different ways and / or replaced or supplemented with other components or their equivalents in the described systems, architectures, devices, or circuits. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents will be interpreted as included in the present disclosure.

Claims

1. A method for detecting generator speed-winding voltage characteristics, characterized in that: The generator speed-winding voltage characteristic detection method comprises: When the generator is in no-load operation, the ratio of the speed change of the generator to the winding voltage change is calculated based on the preset voltage collection interval, thereby constructing a ratio sequence of the speed change to the winding voltage change; Determine an average of a 2n-1th ratio and a 2n-2th ratio in the ratio sequence, where n is an integer greater than or equal to 2 and less than or equal to (N+1) / 2, and N is the number of ratios in the ratio sequence; In response to the determined average values ​​being equal to each other, determining that the speed-winding voltage characteristic curve of the generator satisfies a linear relationship, wherein the speed-winding voltage characteristic curve of the generator satisfies the linear relationship indicating that the speed-winding voltage characteristic of the generator is normal; In response to the determined average values ​​being not equal to each other, it is determined that the speed-winding voltage characteristic curve of the generator does not satisfy a linear relationship, wherein the speed-winding voltage characteristic curve of the generator does not satisfy a linear relationship indicating that the speed-winding voltage characteristic of the generator is abnormal.

2. The generator speed-winding voltage characteristic detection method according to claim 1, characterized in that: During a time period of increasing speed of the generator or a predetermined detection time period when the generator is in a no-load operation state, the ratio of the speed change of the generator to the winding voltage change is continuously calculated based on a preset voltage collection interval.

3. The generator speed-winding voltage characteristic detection method according to claim 1, characterized in that: The generator speed-winding voltage characteristic detection method also includes: before determining the average value of the 2n-1th ratio and the 2n-2th ratio in the ratio sequence, in response to the ratios in the ratio sequence being equal to each other, determining that the generator speed-winding voltage characteristic curve is a straight line.

4. The generator speed-winding voltage characteristic detection method according to claim 1, characterized in that: The generator speed-winding voltage characteristic detection method also includes: before calculating the ratio of the generator speed change to the winding voltage change, filtering the generator winding voltage and speed using the same filtering algorithm and filtering time window.

5. The generator speed-winding voltage characteristic detection method according to claim 1, characterized in that: In response to the determined average values ​​being equal to each other, determining that the speed-winding voltage characteristic curve of the generator satisfies a linear relationship, including: in response to the determined average values ​​being equal to each other and equal to the average value of all ratios in the ratio sequence, determining that the speed-winding voltage characteristic curve of the generator satisfies a linear relationship.

6. The generator speed-winding voltage characteristic detection method according to claim 1, characterized in that: Calculating the ratio of the generator speed change to the winding voltage change includes: calculating the ratio of the absolute value of the generator speed change to the winding voltage change.

7. A generator speed-winding voltage characteristic detection device, characterized in that: The generator speed-winding voltage characteristic detection device comprises: A ratio sequence determination unit is used to calculate the ratio of the speed change amount to the winding voltage change amount of the generator based on a preset voltage collection interval when the generator is in a no-load operation state, thereby constructing a ratio sequence of the speed change amount to the winding voltage change amount; an average value determining unit, used to determine an average value of a 2n-1th ratio and a 2n-2th ratio in the ratio sequence, wherein n is an integer greater than or equal to 2 and less than or equal to (N+1) / 2, and N is the number of ratios in the ratio sequence; The speed-winding voltage characteristic detection unit determines that the speed-winding voltage characteristic curve of the generator satisfies a linear relationship in response to the determined average values ​​being equal to each other, wherein the fact that the speed-winding voltage characteristic curve of the generator satisfies the linear relationship indicates that the speed-winding voltage characteristic of the generator is normal; and determines that the speed-winding voltage characteristic curve of the generator does not satisfy the linear relationship in response to the determined average values ​​not being equal to each other, wherein the fact that the speed-winding voltage characteristic curve of the generator does not satisfy the linear relationship indicates that the speed-winding voltage characteristic of the generator is abnormal.

8. A computing system comprising at least one computing device and at least one storage device storing instructions, characterized in that: When the instructions are executed by the at least one computing device, the at least one computing device is prompted to execute the generator speed-winding voltage characteristic detection method according to any one of claims 1-6.

9. A computer-readable storage medium storing instructions, characterized in that: When the instruction is executed by at least one computing device, the at least one computing device is prompted to execute the generator speed-winding voltage characteristic detection method according to any one of claims 1-6.

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