Electromagnetic brake online maintenance evaluation method, device and equipment and storage medium

Abstract

The invention discloses an electromagnetic brake on-line maintenance evaluation method, device and equipment and a storage medium, and relates to the technical field of wind power generation, and the method comprises the steps that when a wind turbine generator runs, the yaw starting frequency of an electromagnetic brake is obtained, and first dynamic friction loss is determined in combination with a preset running protection speed and a starting yaw angular speed; the yaw braking frequency is obtained, and second dynamic friction loss is determined in the same mode; and third dynamic friction loss is determined according to the total yaw slip number, the preset slip protection speed and the slip yaw angular speed. And determining a target braking energy threshold value by analyzing whether yaw slip exists or not, and comparing the target braking energy threshold value with the sum of the losses to obtain a friction loss period to be detected. And whether the period meets a preset condition is judged, if yes, a target friction loss period is determined, and then electromagnetic brake online maintenance evaluation operation is triggered. In this way, the accuracy of yaw electromagnetic brake maintenance can be effectively improved, and the operation and maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to an electromagnetic brake online maintenance evaluation method, device, equipment and storage medium. Background Art

[0002] Electromagnetic brake is one of the important components that provides braking capability for the yaw system of wind turbines, especially the sliding yaw system, so the reliability of electromagnetic brake is particularly critical. However, as a consumable part, electromagnetic brake needs regular operation and maintenance.

[0003] In the existing solution, the brake clearance of the electromagnetic brake is detected by micro switch or current detection technology to determine whether the electromagnetic brake needs to be replaced or the clearance needs to be adjusted to ensure the braking capacity. However, due to the influence of motor operation vibration and electromagnetic interference, false alarms are often reported on site, and even the unit is shut down, resulting in power generation loss. In particular, the offshore units that tend to be larger in megawatts involve the monitoring of multiple yaw motors and the requirements for going to sea, which makes their operation and maintenance costs higher.

[0004] In summary, how to improve the accuracy of yaw electromagnetic brake maintenance and reduce operation and maintenance costs is a key issue that needs to be solved urgently. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide an electromagnetic brake online maintenance assessment method, device, equipment and storage medium, which can improve the accuracy of yaw electromagnetic brake maintenance and reduce operation and maintenance costs. The specific scheme is as follows:

[0006] In a first aspect, the present application provides an electromagnetic brake online maintenance assessment method, which is applied to a wind turbine yaw system, comprising:

[0007] During the operation of the wind turbine generator set, the current number of yaw activations of the electromagnetic brake is obtained, and the first dynamic friction loss is determined based on a preset operation protection speed, the number of yaw activations, and a starting yaw angular velocity of the wind turbine generator set corresponding to each yaw activation;

[0008] Obtaining the current number of yaw braking times of the electromagnetic brake, and determining the corresponding second dynamic friction loss based on the preset operation protection speed, the number of yaw braking times, and the operating yaw angular velocity of the wind turbine corresponding to each yaw braking;

[0009] Based on the total number of slips of the wind turbine generator set during the yaw slip process, and using a preset slip protection speed and a sliding yaw angular velocity of the wind turbine generator set corresponding to each slip, a corresponding third dynamic friction loss is determined;

[0010] By analyzing whether there is yaw slip during the yaw slip process, a corresponding target braking energy threshold is determined based on the obtained analysis result, and the target braking energy threshold is compared with the sum of the first dynamic friction loss, the second dynamic friction loss and the third dynamic friction loss, so as to determine a corresponding friction loss cycle to be detected according to the obtained comparison result;

[0011] It is determined whether the friction loss cycle to be detected meets a preset condition, and when the obtained cycle determination result indicates that it meets the preset condition, a target friction loss cycle is determined to trigger an online maintenance evaluation operation corresponding to the electromagnetic brake based on the target friction loss cycle.

[0012] Optionally, the obtaining of the current number of yaw activations of the electromagnetic brake and determining the first dynamic friction loss based on a preset operation protection speed, the number of yaw activations and a starting yaw angular velocity of the wind turbine generator corresponding to each yaw activation includes:

[0013] Get the current electromagnetic brake yaw activation times;

[0014] The first dynamic friction loss is determined based on the preset operation protection speed, the number of yaw starts, the starting yaw angular velocity of the wind turbine corresponding to each yaw start, the number of large teeth, the number of small teeth, the preset moment of inertia and the preset dynamic friction energy calculation formula.

[0015] Optionally, the analyzing whether yaw slip occurs during the yaw slip process to determine a corresponding target braking energy threshold based on an analysis result includes:

[0016] By analyzing whether a yaw slip alarm has been triggered during the yaw slip process, it is determined whether yaw slip exists, and a corresponding yaw slip determination result is obtained;

[0017] When the yaw slip judgment result indicates that there is no yaw slip, a corresponding first analysis result is determined, so as to select a preset braking energy threshold as a target braking energy threshold based on the first analysis result.

[0018] Optionally, the analyzing whether yaw slip occurs during the yaw slip process to determine a corresponding target braking energy threshold based on an analysis result includes:

[0019] When the yaw slip result indicates that there is yaw slip and the current yaw slip number is not greater than a preset number threshold, determining a corresponding second analysis result, so as to determine the corresponding target braking energy threshold based on the second analysis result, the preset braking energy threshold and the preset multiple;

[0020] When the yaw slip result indicates that yaw slip exists and the number of yaw slips is greater than the preset number threshold, a corresponding third analysis result is determined, so as to determine the corresponding target braking energy threshold based on the third analysis result, the preset braking energy and a target multiple value with the yaw slip number as an index and the preset multiple value as a base.

[0021] Optionally, the determining the corresponding third dynamic friction loss by using the preset slip protection speed and the sliding yaw angular velocity of the wind turbine generator set corresponding to each slip includes:

[0022] For yaw slip, determining a corresponding fourth dynamic friction loss using the preset slip protection speed and the number of yaw slips;

[0023] For non-yaw slip, a corresponding non-yaw slip number is calculated based on the total slip number and the yaw slip number, and a corresponding fifth dynamic friction loss is determined using the sliding yaw angular velocity of the wind turbine corresponding to each non-yaw slip and the non-yaw slip number;

[0024] A corresponding third dynamic friction loss is determined based on the fourth dynamic friction loss and the fifth dynamic friction loss.

[0025] Optionally, judging whether the friction loss cycle to be detected meets a preset condition, and determining a target friction loss cycle when the obtained cycle judgment result shows that the condition is met, includes:

[0026] Determine whether the friction loss period to be detected is not less than a preset unit operation and maintenance period to obtain a corresponding first determination result;

[0027] If the first judgment result indicates that it is not less than, determining the difference between the friction loss cycle to be detected and the preset unit operation and maintenance cycle;

[0028] Determine whether the difference is not greater than a preset difference threshold to obtain a second determination result;

[0029] If the second judgment result indicates that it is not greater than, the friction loss cycle to be detected is determined to be the target friction loss cycle.

[0030] Optionally, after determining whether the friction loss cycle to be detected meets a preset condition, the method further includes:

[0031] If the first judgment result indicates that it is less than or the second judgment result indicates that it is greater than, it is determined that the friction loss cycle to be detected does not meet the preset condition, and the preset running protection speed and / or the preset slip protection speed are adjusted;

[0032] Based on the adjusted preset operating protection speed and / or the adjusted preset slip protection speed, jump again to the step of obtaining the number of yaw starts of the current electromagnetic brake, and determine the first dynamic friction loss based on the preset operating protection speed, the number of yaw starts and the starting yaw angular velocity of the wind turbine corresponding to each yaw start, until the target friction loss cycle is determined.

[0033] In a second aspect, the present application provides an electromagnetic brake online maintenance evaluation device, which is applied to a yaw system of a wind turbine, comprising:

[0034] A first loss determination module is used to obtain the number of yaw starts of the current electromagnetic brake during the operation of the wind turbine set, and determine the first dynamic friction loss based on a preset operation protection speed, the number of yaw starts, and a starting yaw angular velocity of the wind turbine set corresponding to each yaw start;

[0035] a second loss determination module, configured to obtain the current number of yaw braking times of the electromagnetic brake, and determine the corresponding second dynamic friction loss based on the preset operation protection speed, the number of yaw braking times, and the operating yaw angular velocity of the wind turbine corresponding to each yaw braking;

[0036] A third loss determination module is used to determine a corresponding third dynamic friction loss based on the total number of slips of the wind turbine set during the yaw slip process, and using a preset slip protection speed and a sliding yaw angular velocity of the wind turbine set corresponding to each slip;

[0037] a loss comparison module, configured to determine a corresponding target braking energy threshold based on an analysis result obtained by analyzing whether yaw slip exists in the yaw slip process, and compare the target braking energy threshold with the sum of the first dynamic friction loss, the second dynamic friction loss and the third dynamic friction loss, so as to determine a corresponding friction loss period to be detected according to the comparison result obtained;

[0038] The cycle determination module is used to determine whether the friction loss cycle to be detected meets the preset conditions, and when the obtained cycle determination result shows that it meets the preset conditions, determine the target friction loss cycle to trigger the online maintenance evaluation operation corresponding to the electromagnetic brake based on the target friction loss cycle.

[0039] In a third aspect, the present application provides an electronic device, including:

[0040] Memory, used to store computer programs;

[0041] The processor is used to execute the computer program to implement the above-mentioned electromagnetic brake online maintenance evaluation method.

[0042] In a fourth aspect, the present application provides a computer-readable storage medium for storing a computer program; wherein, when the computer program is executed by a processor, the aforementioned electromagnetic brake online maintenance evaluation method is implemented.

[0043] In the present application, during the operation of the wind turbine, the current number of yaw start-ups of the electromagnetic brake is obtained, and the first dynamic friction loss is determined based on the preset operation protection speed, the number of yaw starts, and the starting yaw angular velocity of the wind turbine corresponding to each yaw start; the current number of yaw brakings of the electromagnetic brake is obtained, and the corresponding second dynamic friction loss is determined based on the preset operation protection speed, the number of yaw brakings, and the operating yaw angular velocity of the wind turbine corresponding to each yaw braking; based on the total number of slips of the current wind turbine in the yaw slip process, and using the preset slip protection speed, the sliding yaw angle of the wind turbine corresponding to each slip, the second dynamic friction loss is determined. speed to determine the corresponding third dynamic friction loss; by analyzing whether there is yaw slip during the yaw slip process, the corresponding target braking energy threshold is determined based on the obtained analysis result, and the target braking energy threshold is compared with the sum of the first dynamic friction loss, the second dynamic friction loss and the third dynamic friction loss, so as to determine the corresponding friction loss cycle to be detected according to the obtained comparison result; judge whether the friction loss cycle to be detected meets the preset conditions, and when the obtained cycle judgment result shows that it meets the preset conditions, determine the target friction loss cycle, so as to trigger the online maintenance evaluation operation corresponding to the electromagnetic brake based on the target friction loss cycle. As can be seen from the above, when the wind turbine is running, the application obtains the number of electromagnetic brake yaw starts, and determines the first dynamic friction loss in combination with the preset operating protection speed and the starting yaw angular velocity; obtains the number of yaw braking, and determines the second dynamic friction loss in the same way; determines the third dynamic friction loss according to the total number of yaw slip slips, the preset slip protection speed and the sliding yaw angular velocity. The target braking energy threshold is determined by analyzing whether there is slip in the yaw slip, and the friction loss cycle to be detected is obtained by comparing it with the sum of the above losses. It is determined whether the cycle meets the preset conditions. If it does, the target friction loss cycle is determined, thereby triggering the electromagnetic brake online maintenance evaluation operation. In this way, the application can effectively improve the accuracy of yaw electromagnetic brake maintenance and reduce operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0045] Figure 1A flow chart of an electromagnetic brake online maintenance evaluation method disclosed in this application;

[0046] Figure 2 This is a schematic diagram of the structure of an electromagnetic brake online maintenance device disclosed in this application;

[0047] Figure 3 This is a structural diagram of an electromagnetic brake online maintenance device disclosed in this application. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In the existing scheme, the brake clearance of the electromagnetic brake is detected by micro switches or current detection technology to determine whether the electromagnetic brake needs to be replaced or the clearance needs to be adjusted to ensure braking capacity. However, due to the influence of motor operation vibration and electromagnetic interference, false alarms are often reported on site, and even the unit is shut down, resulting in power generation loss. In particular, the increasingly large-megawatt offshore units involve the monitoring of multiple yaw motors and the requirements for going to sea, which makes their operation and maintenance costs relatively high. To this end, the present application provides an electromagnetic brake online maintenance assessment scheme to improve the accuracy of yaw electromagnetic brake maintenance and reduce operation and maintenance costs.

[0050] See also Figure 1 As shown, an embodiment of the present invention discloses an electromagnetic brake online maintenance evaluation method, which is applied to a yaw system of a wind turbine generator set, comprising:

[0051] Step S11, during the operation of the wind turbine generator set, the current yaw start times of the electromagnetic brake are obtained, and the first dynamic friction loss is determined based on a preset operation protection speed, the yaw start times and the starting yaw angular velocity of the wind turbine generator set corresponding to each yaw start.

[0052] In this embodiment, it is necessary to obtain the number of yaw starts of the current electromagnetic brake. Specifically, in the operation scenario of the wind turbine, a data acquisition module that can monitor and record in real time each time the electromagnetic brake enters the yaw start state can be set in the control system of the wind turbine, so as to use the data acquisition module to count the number of yaw starts of the current electromagnetic brake. After obtaining the number of yaw starts, the first dynamic friction loss is determined based on the preset operating protection speed, the number of yaw starts, the starting yaw angular velocity of the wind turbine corresponding to each yaw start, the number of large teeth, the number of small teeth, the preset moment of inertia, and the preset dynamic friction energy calculation formula.

[0053] It can be understood that, in this embodiment, the startup yaw angular velocity of the wind turbine can be measured and recorded in real time by the built-in angular velocity sensor of the wind turbine. At the same time, parameters such as the number of large teeth, the number of small teeth, and the preset moment of inertia are all inherent characteristic parameters of the yaw drive component of the wind turbine, which have been determined and remain unchanged during the design and manufacturing stage of the unit. Based on the above parameters, a preset dynamic friction energy calculation formula can be introduced to determine the first dynamic friction loss.

[0054] It should be noted that according to the law of conservation of energy, the calculation formula of dynamic friction energy W is as follows:

[0055] ;

[0056] Where J is the moment of inertia of the yaw drive assembly, is the angular velocity of the yaw motor at time t, is the angular velocity of the yaw motor at time t+1, W t is the kinetic friction energy (loss) at time t.

[0057] On this basis, taking the angular velocity of the yaw motor at time t as an example, according to the relevant mechanical motion principles, the angular velocity of the yaw motor can be converted as follows:

[0058] ;

[0059] Where i is the internal speed ratio of the yaw drive assembly, Z2 is the number of large teeth of the wind turbine, Z1 is the number of small teeth of the wind turbine, and v t is the yaw angular velocity of the wind turbine at time t.

[0060] After converting the angular velocity of the yaw motor, the converted angular velocity of the yaw motor is substituted into the dynamic friction energy calculation formula to obtain the preset dynamic friction energy calculation formula required by this embodiment. The preset dynamic friction energy calculation formula is as follows:

[0061] ;

[0062] Among them, v t+1 is the yaw angular velocity of the wind turbine at time t+1. In this embodiment, the energy loss value caused by the dynamic friction of the electromagnetic brake during a certain yaw start-up process can be obtained based on the preset dynamic friction energy calculation formula. Then, the number of yaw starts and the starting yaw angular velocity of the wind turbine corresponding to a single yaw start are accumulated and calculated to obtain the energy loss value based on the current number of yaw starts, that is, the first dynamic friction loss.

[0063] Step S12, obtaining the current yaw braking times of the electromagnetic brake, and determining the corresponding second dynamic friction loss based on the preset operating protection speed, the yaw braking times and the operating yaw angular velocity of the wind turbine corresponding to each yaw braking.

[0064] In this embodiment, the second dynamic friction loss of the electromagnetic brake based on the current number of yaw braking times can be calculated using the above-mentioned preset dynamic friction energy calculation formula based on the preset operating protection speed, the number of yaw braking times, and the operating yaw angular velocity of the wind turbine corresponding to each yaw braking.

[0065] Step S13: determining a corresponding third dynamic friction loss based on the total number of slips of the wind turbine generator set during the yaw slip process, using a preset slip protection speed, and a sliding yaw angular velocity of the wind turbine generator set corresponding to each slip.

[0066] In this embodiment, in a specific implementation, for yaw slip, the corresponding fourth dynamic friction loss is determined using the preset slip protection speed and the number of yaw slips. The preset slip protection speed is the maximum safe slip speed allowed by the wind turbine during yaw slip, and the number of yaw slips is the number of times the current yaw angular velocity of the wind turbine during yaw slip is greater than the preset operation protection speed.

[0067] In another specific implementation, for non-yaw slip, the corresponding non-yaw slip number is calculated based on the total slip number and the yaw slip number, and the corresponding fifth dynamic friction loss is determined using the sliding yaw angular velocity of the wind turbine corresponding to each non-yaw slip and the non-yaw slip number. Specifically, the non-yaw slip number can be calculated by subtracting the yaw slip number from the total slip number, and the non-yaw slip number is the number of times that the current yaw angular velocity of the wind turbine during the yaw slip process is not greater than the preset operation protection speed.

[0068] In this embodiment, after the fourth friction loss and the fifth friction loss are obtained, the corresponding third dynamic friction loss is determined based on the fourth dynamic friction loss and the fifth dynamic friction loss.

[0069] Step S14: analyzing whether there is yaw slip during the yaw slip process to determine a corresponding target braking energy threshold based on the analysis result, and comparing the target braking energy threshold with the sum of the first dynamic friction loss, the second dynamic friction loss and the third dynamic friction loss to determine a corresponding friction loss cycle to be detected based on the comparison result.

[0070] In this embodiment, by analyzing whether the yaw slip alarm has been triggered during the yaw slip process, it is determined whether there is yaw slip and a corresponding yaw slip determination result is obtained. The yaw slip alarm may include information such as the sliding yaw angular velocity when the yaw slip occurs, which can help the operation and maintenance personnel understand the severity of the yaw slip.

[0071] It is understandable that when the yaw slip judgment result indicates that there is no yaw slip, the corresponding first analysis result is determined, so as to select a preset braking energy threshold as the target braking energy threshold based on the first analysis result. The preset braking energy threshold may be a threshold determined by relevant technicians in the long-term wind turbine operation and maintenance practice according to actual data of electromagnetic brakes under various conditions.

[0072] When the yaw slip result indicates that yaw slip exists and the current number of yaw slips is not greater than the preset number threshold, the corresponding second analysis result is determined to determine the corresponding target braking energy threshold based on the second analysis result, the preset braking energy threshold and the preset multiple; when the yaw slip result indicates that yaw slip exists and the number of yaw slips is greater than the preset number threshold, the corresponding third analysis result is determined to determine the corresponding target braking energy threshold based on the third analysis result, the preset braking energy and the target multiple with the number of yaw slips as the index and the preset multiple as the base.

[0073] In this embodiment, after determining the target braking energy threshold, it is compared with the sum of the first dynamic friction loss, the second dynamic friction loss and the third dynamic friction loss. The first dynamic friction loss reflects the energy loss during the yaw start-up process, the second dynamic friction loss reflects the energy loss during the yaw braking process, and the third dynamic friction loss reflects the energy loss during the yaw slip process. By comparison, the corresponding friction loss cycle to be detected can be determined according to the obtained comparison result.

[0074] Step S15, judging whether the friction loss cycle to be detected meets a preset condition, and when the obtained cycle judgment result shows that it meets the preset condition, determining a target friction loss cycle to trigger an online maintenance evaluation operation corresponding to the electromagnetic brake based on the target friction loss cycle.

[0075] In this embodiment, it is determined whether the friction loss cycle to be detected is not less than the preset unit operation and maintenance cycle to obtain the corresponding first judgment result. Among them, the preset unit operation and maintenance cycle is a value determined based on multiple factors such as the life of each component of the wind turbine, maintenance cost, and operating efficiency. If the first judgment result shows that it is not less than, the difference between the friction loss cycle to be detected and the preset unit operation and maintenance cycle is determined, and it is determined whether the difference is not greater than the preset difference threshold to obtain the second judgment result. It can be understood that the setting of the preset difference threshold is to rationalize the maintenance timing, so that resources will not be wasted due to premature maintenance, and the safety of the wind turbine will not be affected due to late maintenance. If the second judgment result shows that it is not greater than, the friction loss cycle to be detected is determined to be the target friction loss cycle.

[0076] It should be emphasized that the target friction loss cycle is a key indicator for evaluating the performance of electromagnetic brakes and determining the timing of maintenance. It can guide operation and maintenance personnel to inspect and maintain the electromagnetic brakes at the appropriate time, thereby ensuring the stable operation of wind turbines and effectively avoiding safety accidents and economic losses caused by electromagnetic brake failures.

[0077] In this embodiment, if the first judgment result indicates that it is less than or the second judgment result indicates that it is greater than, it is determined that the friction loss cycle to be detected does not meet the preset conditions, and the preset operating protection speed and / or the preset slip protection speed are adjusted. Based on the adjusted preset operating protection speed and / or the adjusted preset slip protection speed, jump again to the step of obtaining the number of yaw starts of the current electromagnetic brake, and determine the first dynamic friction loss based on the preset operating protection speed, the number of yaw starts, and the starting yaw angular velocity of the wind turbine corresponding to each yaw start, until the target friction loss cycle is determined. That is, after adjusting the preset operating protection speed and / or the preset slip protection speed, re-execute steps S11 to S15 until the target friction loss cycle is determined.

[0078] As can be seen from the above, when the wind turbine is running, the present application obtains the number of electromagnetic brake yaw start-ups, and determines the first dynamic friction loss in combination with the preset operating protection speed and the starting yaw angular velocity; obtains the number of yaw braking times, and determines the second dynamic friction loss in the same way; and determines the third dynamic friction loss according to the total number of yaw slips, the preset slip protection speed, and the sliding yaw angular velocity. The target braking energy threshold is determined by analyzing whether the yaw slip has slipped, and compared with the sum of the above losses to obtain the friction loss cycle to be detected. It is determined whether the cycle meets the preset conditions. If it does, the target friction loss cycle is determined, and then the electromagnetic brake online maintenance evaluation operation is triggered. In this way, the present application can effectively improve the accuracy of yaw electromagnetic brake maintenance and reduce operation and maintenance costs.

[0079] The technical solution of the embodiment of the present application is specifically described below with reference to the specific process of determining the target friction loss cycle.

[0080] In this embodiment, regarding the yaw system of the wind turbine, during the period from the moment when the electromagnetic brake is powered off to the moment when the electromagnetic brake is powered on and released, the yaw angular velocity of the wind turbine changes from 0 to the starting yaw angular velocity v start-tk , so the single dynamic friction energy W for this period of time t1 As shown below:

[0081] ;

[0082] The first dynamic friction loss is calculated based on the single dynamic friction energy. The first dynamic friction loss is as follows:

[0083] ;

[0084] Where n is the number of electromagnetic brake yaw activations; v start-tk is the starting yaw angular velocity corresponding to the time tk; tk is the time of the kth start, k is [0, n]; W start-tk is the first dynamic friction loss corresponding to time tk. It should be emphasized that each time the yaw is started, the starting yaw angular velocity can be different, and the starting yaw angular velocity is not greater than v A (That is, the preset running protection speed).

[0085] Similarly, during the time from when the electromagnetic brake is powered on and released to when the electromagnetic brake is powered off and locked, the yaw angular velocity of the wind turbine changes from v run-t (that is, the running yaw angular velocity) is braked to 0, from which the second dynamic friction loss can be calculated. The second dynamic friction loss is as follows:

[0086] ;

[0087] Where m is the number of yaw braking times of the electromagnetic brake, v is run-tk W is the operating yaw angular velocity corresponding to time tk; run-tk is the second dynamic friction loss corresponding to time tk. It should also be emphasized that each time the yaw braking is performed, the operating yaw angular velocity can be different, and the operating yaw angular velocity is not greater than v B (That is, preset the running protection speed, set v A ≤v B ).

[0088] During the whole process of electromagnetic brake power-off and braking, the third dynamic friction loss needs to be calculated. The third dynamic friction loss is as follows:

[0089] ;

[0090] Where h is the total slip times of the wind turbine, g is the yaw slip times of the wind turbine, hg is the non-yaw slip times of the wind turbine, and v slip-tp is the sliding yaw angular velocity of the wind turbine at time tp, tp is the time of the pth slip, and p takes the value [0, h]. BP is the preset operating protection speed at the pth slip, W BP is the fourth dynamic friction loss during the pth slip, W tp is the fifth dynamic friction loss during the pth slip, W slip-tp is the third dynamic friction loss during the p-th slip.

[0091] If the yaw slip alarm is not triggered during the yaw slip process, the maximum allowable braking energy (i.e., the target braking energy threshold) in this case is W p , and needs to be compared with the target braking energy threshold in this case based on the sum of the first dynamic friction loss, the second dynamic friction loss and the fifth dynamic friction loss. The relationship between all dynamic friction losses and the target braking energy threshold in this case that needs to be satisfied when the electromagnetic brake is not damaged can be as follows:

[0092] ;

[0093] If the yaw slip alarm is triggered during the yaw slip process and the number of yaw slips is less than 1 (that is, the preset number threshold), the maximum allowable braking energy in this case (that is, the target braking energy threshold) is 0.4W. p ;

[0094] If the yaw slip alarm is triggered during the yaw slip process and the number of yaw slips is not less than 1, the maximum allowable braking energy (i.e. the target braking energy threshold) in this case is 0.4 g W p , and the sum of the first dynamic friction loss, the second dynamic friction loss, the fourth dynamic friction loss and the fifth dynamic friction loss needs to be compared with the target braking energy threshold in this case. The relationship that needs to be satisfied between all dynamic friction losses and the target braking energy threshold in this case when the electromagnetic brake is not damaged can be as follows:

[0095] ;

[0096] By determining the target braking energy threshold, and determining the corresponding T based on the comparison result p (i.e. the friction loss cycle to be detected). In the specific implementation, the timing will be started at a certain moment during the operation of the wind turbine, and the yaw start, yaw braking times and slipping in the subsequent process will be counted in real time and compared with the real-time friction loss calculation, until the comparison result with the target braking energy threshold shows that T can be determined at this time.p (For example, when all current friction losses are equal to the target braking energy threshold, that is, when the braking energy that the electromagnetic brake can withstand is about to be exceeded), T can be determined based on the start timing time and the current time. p If T p Not less than T (that is, the preset unit operation and maintenance period) and T p If the difference between the T and T is not greater than 10 days (that is, the preset difference threshold), then the T p is determined as the target friction loss cycle; otherwise, if T p Not less than T and / or T p If the difference with T is not greater than 10 days, you can adjust v A and v B , and then re-execute the above steps until the target friction loss cycle is determined.

[0097] Accordingly, see Figure 2 As shown, the embodiment of the present application also provides an electromagnetic brake online maintenance evaluation device, which is applied to the yaw system of a wind turbine, comprising:

[0098] The first loss determination module 11 is used to obtain the number of yaw starts of the current electromagnetic brake during the operation of the wind turbine set, and determine the first dynamic friction loss based on a preset operation protection speed, the number of yaw starts, and the starting yaw angular velocity of the wind turbine set corresponding to each yaw start;

[0099] The second loss determination module 12 is used to obtain the current yaw braking times of the electromagnetic brake, and determine the corresponding second dynamic friction loss based on the preset operation protection speed, the yaw braking times and the operating yaw angular velocity of the wind turbine corresponding to each yaw braking;

[0100] A third loss determination module 13 is used to determine a corresponding third dynamic friction loss based on the total number of slips of the wind turbine in the yaw slip process, and using a preset slip protection speed and a sliding yaw angular velocity of the wind turbine corresponding to each slip;

[0101] a loss comparison module 14, configured to determine a corresponding target braking energy threshold value based on an analysis result obtained by analyzing whether yaw slip exists in the yaw slip process, and to compare the target braking energy threshold value with the sum of the first dynamic friction loss, the second dynamic friction loss and the third dynamic friction loss, so as to determine a corresponding friction loss period to be detected according to the comparison result obtained;

[0102] The cycle determination module 15 is used to determine whether the friction loss cycle to be detected meets the preset conditions, and when the obtained cycle judgment result shows that it meets the preset conditions, determine the target friction loss cycle to trigger the online maintenance evaluation operation corresponding to the electromagnetic brake based on the target friction loss cycle.

[0103] As can be seen from the above, when the wind turbine is running, the present application obtains the number of electromagnetic brake yaw start-ups, and determines the first dynamic friction loss in combination with the preset operating protection speed and the starting yaw angular velocity; obtains the number of yaw braking times, and determines the second dynamic friction loss in the same way; and determines the third dynamic friction loss according to the total number of yaw slips, the preset slip protection speed, and the sliding yaw angular velocity. The target braking energy threshold is determined by analyzing whether the yaw slip has slipped, and compared with the sum of the above losses to obtain the friction loss cycle to be detected. It is determined whether the cycle meets the preset conditions. If it does, the target friction loss cycle is determined, and then the electromagnetic brake online maintenance evaluation operation is triggered. In this way, the present application can effectively improve the accuracy of yaw electromagnetic brake maintenance and reduce operation and maintenance costs.

[0104] In a specific implementation, the first loss determination module 11 may specifically include:

[0105] A times acquisition unit is used to obtain the current electromagnetic brake yaw activation times;

[0106] The first loss determination unit is used to determine the first dynamic friction loss based on a preset operating protection speed, the number of yaw starts, the starting yaw angular velocity of the wind turbine corresponding to each yaw start, the number of large teeth, the number of small teeth, the preset moment of inertia and the preset dynamic friction energy calculation formula.

[0107] In a specific implementation, the loss comparison module 14 may specifically include:

[0108] a slip judgment unit, configured to judge whether a yaw slip alarm has been triggered during the yaw slip process, so as to judge whether a yaw slip exists, and obtain a corresponding yaw slip judgment result;

[0109] The first result determination unit is used to determine a corresponding first analysis result when the yaw slip judgment result indicates that there is no yaw slip, so as to select a preset braking energy threshold as a target braking energy threshold based on the first analysis result.

[0110] In a specific implementation, the loss comparison module 14 may specifically include:

[0111] a second result determination unit, configured to determine a corresponding second analysis result when the yaw slip result indicates that there is yaw slip and the current yaw slip number is not greater than a preset number threshold, so as to determine the corresponding target braking energy threshold based on the second analysis result, the preset braking energy threshold and the preset multiple;

[0112] The third result determination unit is used to determine the corresponding third analysis result when the yaw slip result indicates that yaw slip exists and the number of yaw slips is greater than the preset number threshold, so as to determine the corresponding target braking energy threshold based on the third analysis result, the preset braking energy and the target multiple value with the yaw slip number as the index and the preset multiple value as the base.

[0113] In a specific implementation, the third loss determination module 13 may specifically include:

[0114] a second loss determination unit, configured to determine a corresponding fourth dynamic friction loss according to the yaw slip by using the preset slip protection speed and the number of yaw slips;

[0115] a third loss determination unit, configured to calculate a corresponding non-yaw slip number for non-yaw slip based on the total slip number and the yaw slip number, and determine a corresponding fifth dynamic friction loss by using a sliding yaw angular velocity of the wind turbine corresponding to each non-yaw slip and the non-yaw slip number;

[0116] The fourth loss determination unit is configured to determine a corresponding third dynamic friction loss based on the fourth dynamic friction loss and the fifth dynamic friction loss.

[0117] In a specific implementation, the period determination module 15 may specifically include:

[0118] A cycle judgment unit, used to judge whether the friction loss cycle to be detected is not less than a preset unit operation and maintenance cycle, so as to obtain a corresponding first judgment result;

[0119] A difference determination unit, configured to determine the difference between the friction loss cycle to be detected and the preset unit operation and maintenance cycle if the first judgment result indicates that it is not less than;

[0120] A result acquisition unit, used to determine whether the difference is not greater than a preset difference threshold, so as to obtain a second determination result;

[0121] The cycle determination unit is used to determine the friction loss cycle to be detected as a target friction loss cycle if the second judgment result indicates that it is not greater than.

[0122] In a specific implementation, the period determination module 15 may further include:

[0123] A speed adjustment unit, configured to determine that the friction loss cycle to be detected does not meet the preset condition if the first judgment result indicates that the speed is less than or the second judgment result indicates that the speed is greater than, and adjust the preset running protection speed and / or the preset slip protection speed;

[0124] An operation jump unit is used to jump again to the step of obtaining the number of yaw starts of the current electromagnetic brake based on the adjusted preset operation protection speed and / or the adjusted preset slip protection speed, and determine the first dynamic friction loss based on the preset operation protection speed, the number of yaw starts and the starting yaw angular velocity of the wind turbine corresponding to each yaw start, until the target friction loss cycle is determined.

[0125] Furthermore, the present application also discloses an electronic device. Figure 3 It is a structural diagram of an electronic device 20 according to an exemplary embodiment. The content in the figure cannot be regarded as any limitation on the scope of use of this application. The electronic device 20 may specifically include: at least one processor 21, at least one memory 22, a power supply 23, a communication interface 24, an input / output interface 25 and a communication bus 26. Among them, the memory 22 is used to store a computer program, and the computer program is loaded and executed by the processor 21 to implement the relevant steps in the electromagnetic brake online maintenance evaluation method disclosed in any of the aforementioned embodiments. In addition, the electronic device 20 in this embodiment may specifically be an electronic computer.

[0126] In this embodiment, the power supply 23 is used to provide working voltage for each hardware device on the electronic device 20; the communication interface 24 can create a data transmission channel between the electronic device 20 and the external device, and the communication protocol it follows is any communication protocol that can be applied to the technical solution of the present application, and is not specifically limited here; the input and output interface 25 is used to obtain external input data or output data to the outside world, and its specific interface type can be selected according to specific application needs and is not specifically limited here.

[0127] In addition, the memory 22 as a carrier for resource storage may be a read-only memory, a random access memory, a disk or an optical disk, etc. The resources stored thereon may include an operating system 221, a computer program 222, etc., and the storage method may be temporary storage or permanent storage.

[0128] The operating system 221 is used to manage and control the hardware devices and computer program 222 on the electronic device 20, which can be Windows Server, Netware, Unix, Linux, etc. In addition to including a computer program that can be used to complete the electromagnetic brake online maintenance evaluation method performed by the electronic device 20 disclosed in any of the aforementioned embodiments, the computer program 222 can further include a computer program that can be used to complete other specific tasks.

[0129] Furthermore, the present application also discloses a computer-readable storage medium for storing a computer program; wherein, when the computer program is executed by a processor, the electromagnetic brake online maintenance evaluation method disclosed above is implemented. The specific steps of the method can refer to the corresponding contents disclosed in the above embodiments, and will not be repeated here.

[0130] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0131] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0132] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0133] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0134] The technical solution provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for general technicians in this field, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An electromagnetic brake online maintenance evaluation method, characterized in that: Applied to the yaw system of wind turbines, including: During the operation of the wind turbine generator set, the number of yaw starts of the current electromagnetic brake is obtained, and the first dynamic friction loss is determined based on the preset operation protection speed, the number of yaw starts and the starting yaw angular velocity of the wind turbine generator set corresponding to each yaw start; Obtaining the current number of yaw braking times of the electromagnetic brake, and determining the corresponding second dynamic friction loss based on the preset operation protection speed, the number of yaw braking times, and the operating yaw angular velocity of the wind turbine generator corresponding to each yaw braking; Based on the total number of slips of the wind turbine generator set during the yaw slip process, and using a preset slip protection speed and a sliding yaw angular velocity of the wind turbine generator set corresponding to each slip, a corresponding third dynamic friction loss is determined; By analyzing whether there is yaw slip during the yaw slip process, a corresponding target braking energy threshold is determined based on the obtained analysis result, and the target braking energy threshold is compared with the sum of the first dynamic friction loss, the second dynamic friction loss and the third dynamic friction loss, so as to determine a corresponding friction loss cycle to be detected according to the obtained comparison result; It is determined whether the friction loss cycle to be detected meets a preset condition, and when the obtained cycle determination result indicates that it meets the preset condition, a target friction loss cycle is determined to trigger an online maintenance evaluation operation corresponding to the electromagnetic brake based on the target friction loss cycle.

2. The electromagnetic brake online maintenance evaluation method according to claim 1, characterized in that: The obtaining of the current number of yaw activations of the electromagnetic brake and determining the first dynamic friction loss based on a preset operation protection speed, the number of yaw activations and a starting yaw angular velocity of the wind turbine generator corresponding to each yaw activation comprises: Get the current electromagnetic brake yaw activation times; The first dynamic friction loss is determined based on the preset operation protection speed, the number of yaw starts, the starting yaw angular velocity of the wind turbine corresponding to each yaw start, the number of large teeth, the number of small teeth, the preset moment of inertia and the preset dynamic friction energy calculation formula.

3. The electromagnetic brake online maintenance evaluation method according to claim 1, characterized in that: The step of analyzing whether yaw slip occurs during the yaw slip process to determine a corresponding target braking energy threshold based on the obtained analysis result includes: By analyzing whether a yaw slip alarm has been triggered during the yaw slip process, it is determined whether yaw slip exists, and a corresponding yaw slip determination result is obtained; When the yaw slip judgment result indicates that there is no yaw slip, a corresponding first analysis result is determined, so as to select a preset braking energy threshold as a target braking energy threshold based on the first analysis result.

4. The electromagnetic brake online maintenance evaluation method according to claim 3, characterized in that: The step of analyzing whether yaw slip occurs during the yaw slip process to determine a corresponding target braking energy threshold based on the obtained analysis result includes: When the yaw slip result indicates that there is yaw slip and the current yaw slip number is not greater than a preset number threshold, determining a corresponding second analysis result, so as to determine the corresponding target braking energy threshold based on the second analysis result, the preset braking energy threshold and the preset multiple; When the yaw slip result indicates that yaw slip exists and the number of yaw slips is greater than the preset number threshold, a corresponding third analysis result is determined, so as to determine the corresponding target braking energy threshold based on the third analysis result, the preset braking energy and a target multiple value with the yaw slip number as an index and the preset multiple value as a base.

5. The electromagnetic brake online maintenance evaluation method according to claim 4, characterized in that: The method of determining the corresponding third dynamic friction loss by using the preset slip protection speed and the sliding yaw angular velocity of the wind turbine generator set corresponding to each slip includes: For yaw slip, determining a corresponding fourth dynamic friction loss using the preset slip protection speed and the number of yaw slips; For non-yaw slip, a corresponding non-yaw slip number is calculated based on the total slip number and the yaw slip number, and a corresponding fifth dynamic friction loss is determined using the sliding yaw angular velocity of the wind turbine corresponding to each non-yaw slip and the non-yaw slip number; A corresponding third dynamic friction loss is determined based on the fourth dynamic friction loss and the fifth dynamic friction loss.

6. The electromagnetic brake online maintenance evaluation method according to any one of claims 1 to 5, characterized in that: The step of judging whether the friction loss cycle to be detected satisfies a preset condition, and determining a target friction loss cycle when the obtained cycle judgment result shows that the condition is satisfied, comprises: Determine whether the friction loss period to be detected is not less than a preset unit operation and maintenance period to obtain a corresponding first determination result; If the first judgment result indicates that it is not less than, determining the difference between the friction loss cycle to be detected and the preset unit operation and maintenance cycle; Determine whether the difference is not greater than a preset difference threshold to obtain a second determination result; If the second judgment result indicates that it is not greater than, the friction loss cycle to be detected is determined to be the target friction loss cycle.

7. The electromagnetic brake online maintenance evaluation method according to claim 6, characterized in that: After determining whether the friction loss cycle to be detected meets the preset conditions, the method further includes: If the first judgment result indicates that it is less than or the second judgment result indicates that it is greater than, it is determined that the friction loss cycle to be detected does not meet the preset condition, and the preset running protection speed and / or the preset slip protection speed are adjusted; Based on the adjusted preset operating protection speed and / or the adjusted preset slip protection speed, jump again to the step of obtaining the number of yaw starts of the current electromagnetic brake, and determine the first dynamic friction loss based on the preset operating protection speed, the number of yaw starts and the starting yaw angular velocity of the wind turbine corresponding to each yaw start, until the target friction loss cycle is determined.

8. An electromagnetic brake online maintenance evaluation device, characterized in that: Applied to the yaw system of wind turbines, including: A first loss determination module is used to obtain the number of yaw starts of the current electromagnetic brake during the operation of the wind turbine set, and determine the first dynamic friction loss based on a preset operation protection speed, the number of yaw starts, and a starting yaw angular velocity of the wind turbine set corresponding to each yaw start; a second loss determination module, configured to obtain the current number of yaw braking times of the electromagnetic brake, and determine the corresponding second dynamic friction loss based on the preset operation protection speed, the number of yaw braking times, and the operating yaw angular velocity of the wind turbine corresponding to each yaw braking; A third loss determination module is used to determine a corresponding third dynamic friction loss based on the total number of slips of the wind turbine set during the yaw slip process, and using a preset slip protection speed and a sliding yaw angular velocity of the wind turbine set corresponding to each slip; a loss comparison module, configured to determine a corresponding target braking energy threshold based on an analysis result obtained by analyzing whether yaw slip exists in the yaw slip process, and compare the target braking energy threshold with the sum of the first dynamic friction loss, the second dynamic friction loss and the third dynamic friction loss, so as to determine a corresponding friction loss period to be detected according to the comparison result obtained; The cycle determination module is used to determine whether the friction loss cycle to be detected meets the preset conditions, and when the obtained cycle determination result shows that it meets the preset conditions, determine the target friction loss cycle to trigger the online maintenance evaluation operation corresponding to the electromagnetic brake based on the target friction loss cycle.

9. An electronic device, characterized in that: include: Memory, used to store computer programs; A processor, configured to execute the computer program to implement the electromagnetic brake online maintenance evaluation method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: Used to store a computer program; wherein, when the computer program is executed by a processor, the electromagnetic brake online maintenance evaluation method according to any one of claims 1 to 7 is implemented.

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