Photovoltaic tracking bracket fault diagnosis method, system and readable medium

Abstract

The present invention provides a photovoltaic tracking bracket fault diagnosis method, system and readable medium, wherein the method includes establishing a motor current and bracket angle reference table based on the historical operation data of the tracking bracket, the operation data including the motor current and the bracket angle; obtaining the operation data of the previous cycle of the tracking bracket, and judging the change trend of the bracket angle according to the operation data of the previous cycle, the change trend including angle decrease and angle increase; obtaining the current operation data of the tracking bracket, the current operation data including the current motor current and the current bracket angle; calculating the motor current warning threshold according to the current bracket angle, the change trend and the motor current and bracket angle reference table; judging whether the current motor current is higher than the motor current warning threshold, and if so, judging that the tracking bracket is faulty.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of photovoltaic tracking brackets, and in particular to a photovoltaic tracking bracket fault diagnosis method, system and readable medium. Background Art

[0002] The photovoltaic tracking bracket is driven by a motor to achieve angle rotation. During the life cycle of the tracking bracket, which is as long as 25 to 30 years, the bracket often stops rotating or even gets damaged due to wear of mechanical components or equipment failure. The common treatment method in the current industry is to repair the photovoltaic tracking bracket after it fails or gets damaged. This method often has a large lag and is prone to irreversible damage to the photovoltaic tracking bracket, which seriously affects the power generation efficiency of the photovoltaic tracking bracket.

[0003] Therefore, it is necessary to monitor the operating status of the photovoltaic tracking bracket in real time, judge and warn of faults, determine the best time for maintenance, and achieve full life cycle management of the photovoltaic tracking bracket. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a photovoltaic tracking bracket fault diagnosis method, system and readable medium, so as to timely diagnose the fault of the photovoltaic tracking bracket and determine the best maintenance time.

[0005] To solve the above technical problems, the present invention provides a photovoltaic tracking bracket fault diagnosis method, including: establishing a motor current and bracket angle reference table based on the historical operation data of the tracking bracket, the operation data including the motor current and the bracket angle; obtaining the operation data of the previous cycle of the tracking bracket, and judging the change trend of the bracket angle according to the operation data of the previous cycle, the change trend including angle decrease and angle increase; obtaining the current operation data of the tracking bracket, the current operation data including the current motor current and the current bracket angle; calculating the motor current warning threshold according to the current bracket angle, the change trend and the motor current and bracket angle reference table; judging whether the current motor current is higher than the motor current warning threshold, and if so, judging that the tracking bracket is faulty.

[0006] Optionally, establishing a motor current and bracket angle reference table based on the historical operating data includes: obtaining from the historical operating data a curve of the motor current changing with the bracket angle when the bracket is operating normally; determining the maximum motor current corresponding to each bracket angle according to the change curve; and adding a first redundant value to each of the maximum motor currents to obtain a current warning reference value corresponding to each bracket angle.

[0007] Optionally, the change curve includes an angle decrease curve and an angle increase curve, and the motor current and bracket angle reference table includes a first current reference table and a second current reference table, the first current reference table is constructed based on the angle decrease curve, and each bracket angle in the first current reference table corresponds to a first current warning reference value, and the second current reference table is constructed based on the angle increase curve, and each bracket angle in the second current reference table corresponds to a second current warning reference value.

[0008] Optionally, it is characterized in that calculating the motor current warning threshold includes: if the changing trend is a decreasing angle, then searching the first current reference table for a corresponding first current warning reference value according to the current bracket angle, and using the first current warning reference value as the motor current warning threshold; if the changing trend is an increasing angle, then searching the second current reference table for a corresponding second current warning reference value according to the current bracket angle, and using the second current warning reference value as the motor current warning threshold.

[0009] Optionally, the method further includes: correcting the motor current warning threshold by using a wind speed correction coefficient and a snow thickness correction coefficient to obtain a final motor current warning threshold.

[0010] Optionally, correcting the motor current warning threshold by means of a wind speed correction coefficient and a snow thickness correction coefficient includes: establishing a wind speed correction coefficient table and a snow thickness correction coefficient curve based on the historical operating data and meteorological data; obtaining the current wind speed, and searching the wind speed correction coefficient table for the corresponding wind speed correction coefficient according to the current wind speed; obtaining the current snow thickness, and inputting the current snow thickness into the snow thickness correction coefficient curve to obtain the snow thickness correction coefficient; and multiplying the motor current warning threshold by the wind speed correction coefficient and the snow thickness correction coefficient.

[0011] Optionally, the method also includes: adding a second redundant value to each of the maximum motor currents to obtain a motor current protection threshold corresponding to each bracket angle, the second redundant value being greater than the first redundant value; searching for the motor current protection threshold corresponding to the current angle; determining whether the current motor current is greater than the motor current protection threshold, and if so, controlling the motor to shut down.

[0012] Optionally, it also includes: when it is determined that there is a fault in the tracking bracket, obtaining the resistance value between the motor inlet and outlet, and judging whether the resistance value is higher than a preset resistance threshold, if so, judging it as a motor fault, otherwise, judging it as a bracket structure fault.

[0013] In order to solve the above technical problems, the present invention provides a photovoltaic tracking bracket fault diagnosis system, including: a meteorological data acquisition device, used to collect meteorological data of the location of the photovoltaic tracking bracket and send the meteorological data to a network control unit; multiple tracking bracket controllers, each tracking bracket controller collects operating data of the corresponding tracking bracket and sends it to the network control unit, the operating data includes motor current and bracket angle; a network control unit, which is respectively communicated with the meteorological data acquisition device and the multiple bracket tracking controllers, and the network control unit includes: a memory, used to store the meteorological data and the operating data, and store instructions executable by a processor; a processor, used to execute the instructions to implement the method as described above.

[0014] In order to solve the above technical problem, the present invention provides a computer readable medium storing a computer program code, and the computer program code implements the above method when executed by a processor.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] In the photovoltaic tracking bracket fault diagnosis method, system and readable medium of the present invention, the motor current warning threshold is not fixed, but is calculated in real time based on the current bracket angle. By judging whether the current motor current is higher than the current warning threshold corresponding to the current bracket angle, the photovoltaic tracking bracket fault diagnosis can be carried out in a timely and accurate manner, which facilitates the determination of the best maintenance time and realizes the full life cycle management of the photovoltaic tracking bracket; on the other hand, the present invention takes into account the influence of wind speed and snow thickness on the motor current, and corrects the motor current warning threshold by the wind speed correction coefficient and the snow thickness correction coefficient. Comparing the current motor current with the corrected motor current warning threshold further improves the accuracy of fault diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the present application. They are included and constitute a part of the present application. The accompanying drawings illustrate embodiments of the present application and together with the present specification serve to explain the principles of the present invention. In the accompanying drawings:

[0018] Figure 1 4 is a system block diagram of a photovoltaic tracking bracket fault diagnosis system according to an embodiment of the present invention.

[0019] Figure 2 is a flow chart of a photovoltaic tracking bracket fault diagnosis method according to an embodiment of the present invention.

[0020] Figure 3 is an angle decreasing curve according to an embodiment of the present invention.

[0021] Figure 4 yes Figure 2Flow chart of an embodiment of step S21 in FIG.

[0022] Figure 5 It corresponds to Figure 3 The motor current and bracket angle reference table constructed by the angle reduction curve.

[0023] Figure 6 is an angle increasing curve according to an embodiment of the present invention.

[0024] Figure 7 4 is a reference table of motor current and bracket angle according to an embodiment of the present invention.

[0025] Figure 8 yes Figure 2 Flow chart of the photovoltaic tracking bracket fault diagnosis method of the optimized embodiment.

[0026] Fig. 9 The present invention is a flow chart of an embodiment of determining a wind speed correction factor and a snow thickness correction factor.

[0027] Fig.10 This is a comparison chart of the motor current curves of a certain tracking bracket when there is wind and when there is no wind. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0029] Flowcharts are used in the present application to illustrate the operations performed by the system according to the embodiments of the present application. It should be understood that the preceding or following operations are not necessarily performed accurately in order. On the contrary, various steps may be processed in reverse order or simultaneously. At the same time, other operations may be added to these processes, or one or more operations may be removed from these processes.

[0030] The photovoltaic tracking bracket is mainly composed of bracket structural parts, columns, photovoltaic modules, drive motors and tracking bracket controllers. Among them, the tracking bracket controller is responsible for calculating the target rotation angle of the bracket and sending instructions to the drive motor for execution. The photovoltaic modules and bracket structural parts are rotated to the specified angle by the drive motor. In static state, the bracket structural parts and components are mainly affected by gravity, friction, and column support force. The direction and magnitude of each part of the force will change at different bracket angles, so the current required to be output by the drive motor is also different. In other words, the output current of the drive motor has a certain relationship with the tracking bracket angle. The present application performs fault diagnosis on the photovoltaic tracking bracket based on the output current of the drive motor and the tracking bracket angle.

[0031] Figure 1 FIG. 1 is a system block diagram of a photovoltaic tracking bracket fault diagnosis system according to an embodiment of the present invention. Figure 1 As shown, the photovoltaic tracking bracket fault diagnosis system 100 includes a network control unit (NCU) 10, a meteorological data acquisition device 11 and a plurality of tracking bracket controllers 12. The network control unit 10 is respectively connected to the meteorological data acquisition device 11 and the plurality of tracking bracket controllers 12 in communication. The meteorological data acquisition device 11 is used to collect meteorological data at the location of the photovoltaic tracking bracket and send the meteorological data to the network control unit 10. The meteorological data may include data such as wind speed, snow thickness, and light intensity. The tracking bracket controller corresponds to the tracking bracket one by one, and each tracking bracket controller collects the operation data of the corresponding tracking bracket and sends it to the network control unit 10. The operation data may include data such as motor current, bracket angle, and working mode. The network control unit 10 includes a memory 101 and a processor 102. The memory 101 is used to store the meteorological data and the operation data, and to store instructions executable by the processor 102. The processor 102 is used to obtain the meteorological data and the operation data from the memory 101, and to execute the photovoltaic tracking bracket fault diagnosis method based on the meteorological data and the operation data.

[0032] Figure 2 FIG. 1 is a flow chart of a photovoltaic tracking bracket fault diagnosis method according to an embodiment of the present invention. Figure 2 As shown, the photovoltaic tracking bracket fault diagnosis method 200 includes:

[0033] Step S21: Establishing a motor current and support angle reference table based on the historical operation data of the tracking support.

[0034] The operation data includes but is not limited to the motor current and the support angle. Optionally, the operation data includes a curve of the motor current changing with the support angle over a period of time.

[0035] Figure 3is an angle decreasing curve according to an embodiment of the present invention. Figure 3 As shown, when the tracking bracket angle decreases from 55° to -55°, the motor current changes with the change of the bracket angle. The discrete points that make up the angle decrease curve can be the operating data of a tracking bracket for multiple times. For example, the angle of a tracking bracket decreases from 55° to -55° for multiple times, and the corresponding relationship between the motor current and the tracking bracket angle is recorded during each operation. The discrete points that make up the angle decrease curve can also be the operating data of multiple tracking brackets. The bracket angles of multiple tracking brackets decrease from 55° to -55°, and the corresponding relationship between the motor current and the tracking bracket angle is recorded when each tracking bracket is running.

[0036] Figure 4 yes Figure 2 Flow chart of step S21 in an embodiment. Figure 4 As shown, the reference table of motor current and bracket angle established based on historical operation data includes:

[0037] Step S211: obtaining from historical operation data a curve of the change of the motor current with the angle of the support when the support is operating normally.

[0038] Step S212: Determine the maximum motor current corresponding to each bracket angle according to the change curve.

[0039] refer to Figure 3 The change curve consists of multiple discrete points, and each tracking bracket angle may correspond to multiple motor currents. For example, when the tracking bracket angle is -40°, the corresponding motor currents include 1.0A, 1.4A, 1.5A, and 1.6A. Select the maximum value, that is, 1.6A, as the maximum motor current corresponding to the tracking bracket angle of -40°. The maximum motor current refers to the maximum current allowed by the motor when the tracking bracket can operate normally. When the maximum motor current is exceeded, the tracking bracket may be faulty. For example, when the tracking bracket is stuck, the motor current is too large.

[0040] Step S213: adding each maximum motor current to the first redundant value to obtain a current warning reference value corresponding to each bracket angle.

[0041] Taking into account the fluctuation of the motor drive itself, the motor current value that triggers the bracket fault warning can reserve a certain margin on the maximum current value. This margin is the first redundancy value. The value of the first redundancy value can be set as needed, and this application does not impose any restrictions on this. Taking the first redundancy value of 1A as an example, the current warning reference value corresponding to the tracking bracket angle of -40° is 2.6A (1.6A+1A).

[0042] In some embodiments, the motor current and bracket angle reference table also includes motor current protection thresholds corresponding to each bracket angle. The motor current protection threshold is obtained by adding a second redundancy value to each maximum motor current, and the second redundancy value is greater than the first redundancy value. Taking the second redundancy value as 3A as an example, the motor current protection threshold corresponding to the tracking bracket angle of -40° is 4.6A (1.6A+3A). Figure 5 It corresponds to Figure 3 The angle reduction curve is used to construct a reference table of motor current and bracket angle. Figure 5 As shown, in the motor current and bracket angle reference table 500, each bracket angle corresponds to a current warning reference value (referred to as the warning reference value) and a motor current protection threshold (referred to as the current protection threshold). For example, the current warning reference value corresponding to the tracking bracket angle of -40° is 2.6A, and the motor current protection threshold is 4.6A. The current warning reference value corresponding to the tracking bracket angle of -55° is 3A, and the motor current protection threshold is 5A. The current warning reference value corresponding to the tracking bracket angle of 55° is 7.5A, and the motor current protection threshold is 9.5A. Other bracket angles can be obtained by searching the reference table, which will not be repeated here.

[0043] Figure 6 is an angle increasing curve according to an embodiment of the present invention. Figure 6 As shown in the figure, when the tracking bracket angle increases from -55° to 55°, the maximum motor current corresponding to the tracking bracket angle of -55° is 6.0A. Figure 2 As shown in the figure, when the tracking bracket angle decreases from 55° to -55°, the maximum motor current corresponding to the tracking bracket angle of -55° is 2.0A. Therefore, the motor current will also vary greatly with different tracking bracket angle change trends. Therefore, the size of the current warning reference value should take into account the operating trend of the bracket rotation.

[0044] Optionally, establishing a reference table of motor current and bracket angle includes establishing a first current reference table and a second current reference table. The first current reference table is constructed based on an angle decreasing curve, and each bracket angle in the first current reference table corresponds to a first current warning reference value. The second current reference table is constructed based on an angle increasing curve, and each bracket angle in the second current reference table corresponds to a second current warning reference value. Figure 7 is a reference table of motor current and bracket angle according to an embodiment of the present invention. Figure 7 As shown, the motor current and support angle reference table 700 includes a first current reference table 71 and a second current reference table 72. For each support angle, it includes a first current warning reference value (referred to as the first reference value), a first motor current protection threshold value (referred to as the first protection threshold value), a second current warning reference value (referred to as the second reference value), and a second motor current protection threshold value (referred to as the second protection threshold value).

[0045] Step S22: Acquire the operation data of the previous cycle of the tracking bracket, and determine the change trend of the bracket angle according to the operation data of the previous cycle, wherein the change trend includes a decreasing angle and an increasing angle.

[0046] The previous cycle refers to the period before the current time. For example, if the cycle is 0.5 hours, the operation data of the tracking bracket in the previous half hour is obtained, and the operation data includes the bracket angle. That is, the bracket angle at each time in the previous half hour is obtained.

[0047] Taking a period of 0.5 hours as an example, the angle of the bracket at each time in the first half hour can be used to determine whether the angle of the bracket is decreasing or increasing. Generally speaking, in a short period of time, the angle of the bracket remains unchanged and there will be no sudden changes. For example, from 17:00 to 17:30, the bracket angle decreases from 40° to 20°, so it can be considered that after 17:30, the bracket angle continues to decrease. Because the sun is from east to west, the photovoltaic tracking bracket changes according to the position of the sun. After 17:00, when the sun sets, the tracking bracket angle (the angle between the bracket and the horizontal plane) should become smaller and smaller, that is, the bracket angle continues to decrease.

[0048] Step S23: Acquire the current operation data of the tracking bracket, wherein the current operation data includes the current motor current and the current bracket angle. Step S24: Calculate the motor current warning threshold according to the current bracket angle, the change trend and the reference table of the motor current and the bracket angle.

[0049] Optionally, calculating the motor current warning threshold includes looking up a corresponding first current warning reference value from a first current reference table according to the current bracket angle if the changing trend is a decreasing angle, and using the first current warning reference value as the motor current warning threshold; if the changing trend is an increasing angle, looking up a corresponding second current warning reference value from a second current reference table according to the current bracket angle, and using the second current warning reference value as the motor current warning threshold.

[0050] Take the current bracket angle of -40° as an example. If the bracket angle is determined to be decreasing, then Figure 7 It can be seen from the first current reference table 71 that the current warning reference value corresponding to the tracking bracket angle of -40° is 2.6A, and the motor current warning threshold is 2.6A. The motor current protection threshold corresponding to the tracking bracket angle of -40° is 4.6A,

[0051] Step S25: determine whether the current motor current is higher than the current warning threshold, and if so, determine that the tracking bracket is faulty.

[0052] Continuing with the example of the current bracket angle of -40°, if the motor current at this time is 3A, it is judged that the current motor current (3A) is higher than the current warning threshold (2.6A), and the tracking bracket is faulty. An alarm signal can be issued to prompt the user.

[0053] In some embodiments, it also includes determining whether the current motor current is higher than the motor current protection threshold. If so, the motor is controlled to shut down to avoid irreversible damage.

[0054] The motor current warning threshold in the photovoltaic tracking bracket fault diagnosis method of the present invention is not fixed, but is calculated in real time according to the current bracket angle. By judging whether the current motor current is higher than the current warning threshold corresponding to the current bracket angle, the photovoltaic tracking bracket fault diagnosis can be carried out in a timely and accurate manner, which is convenient for determining the best maintenance time and realizing the full life cycle management of the photovoltaic tracking bracket.

[0055] In addition to the fact that the angle of the tracking bracket affects the direction and magnitude of the tracking bracket force, when the tracking bracket is subjected to wind load and snow load, it will also affect the direction and magnitude of the tracking bracket force. The impact of snow load on the tracking bracket is mainly reflected in the increase of the gravity of the tracking bracket and the friction during rotation, so the basic relationship between motor drive and snow load is positively correlated. The impact of wind load on the tracking bracket is uncertain, which may cause the motor drive current to increase or decrease, but generally only the impact value that causes the motor drive current to increase is calculated.

[0056] Figure 8 yes Figure 2 Flow chart of the photovoltaic tracking bracket fault diagnosis method of the optimized embodiment. Figure 8 As shown, before entering step S15, the photovoltaic tracking bracket fault diagnosis method 800 also includes step S141 of correcting the motor current warning threshold by using the wind speed correction coefficient and the snow thickness correction coefficient to obtain the final motor current warning threshold.

[0057] Optionally, the motor current warning threshold can be corrected by the following formula:

[0058] I warning =I angle *R wind *R snow

[0059] Among them I warning is the final motor current warning threshold, I angle is the uncorrected motor current warning threshold, R wind is the wind speed correction factor, R snow is the snow thickness correction factor.

[0060] The wind speed correction coefficient and the snow thickness correction coefficient may be preset fixed values ​​or may be determined based on the current wind speed and the current snow thickness.

[0061] Fig. 9 1 is a flow chart of an embodiment of determining a wind speed correction factor and a snow thickness correction factor. Fig. 9 As shown, determining the wind speed correction factor and the snow thickness correction factor includes the following steps:

[0062] Step S91: establishing a wind speed correction coefficient table and a snow thickness correction coefficient curve based on historical meteorological data and operation data, wherein the meteorological data includes wind speed and snow thickness.

[0063] A wind speed correction coefficient table is established based on the corresponding relationship between wind speed and bracket current at the same time. Fig.10 This is a comparison of the motor current curves of a certain tracking bracket when there is wind and when there is no wind. Fig.10 As shown in the figure, in most cases, the motor current values ​​are close when there is wind and when there is no wind. In other words, in most cases, the wind speed has little effect on the motor current. Therefore, the wind speed correction factor R wind Defined as a constant, such as R wind =1A. Further, considering the extreme wind conditions, the wind speed correction factor R can be appropriately enlarged. wind , such as when the wind speed is greater than 20m / s, R wind =2A.

[0064] Unlike wind load, the impact of snow load on the tracking bracket is mainly reflected in the increase of the tracking bracket's gravity and friction during rotation, so the basic relationship between motor drive and snow load is positively correlated. It is generally believed that snow load is evenly covered on the photovoltaic module, so the impact of snow load on the bracket motor current can be calculated by simply obtaining the relationship between snow weight and snow thickness. On the one hand, the snow thickness correction coefficient can be simply estimated based on the module parameters. Among them, d is the thickness of snow on the ground; ρ is the density of snow, generally ρ = 0.1; W is the width of the photovoltaic module; L is the length of the photovoltaic module; G is the weight of the photovoltaic module; On the other hand, the corresponding R of different snow thickness d can be obtained through multiple measurements snow The value of R snow In other words, in the snow thickness correction factor curve, the snow thickness correction factor R snow The value of can be a function of the snow thickness: snow =f(d), where d is the thickness of snow on the ground, which can be measured by a snow thickness sensor.

[0065] Step S92: searching the wind speed correction coefficient table for the corresponding wind speed correction coefficient according to the current wind speed.

[0066] For example, when the current wind speed is less than 20m / s, the wind speed correction factor R wind =1A. When the current wind speed is greater than or equal to 20m / s, the wind speed correction coefficient R wind =2A.

[0067] Step S93: Input the current snow thickness into the snow thickness correction coefficient curve to obtain the snow thickness correction coefficient.

[0068] For example, by inputting the current snow thickness into the function f(d), the snow thickness correction coefficient corresponding to the current snow thickness can be obtained.

[0069] Step S94: multiply the motor current warning threshold by the wind speed correction coefficient and the snow thickness correction coefficient to obtain the final motor current warning threshold.

[0070] By comparing the current motor current with the final motor current warning threshold, it is possible to determine whether the tracking bracket is faulty.

[0071] The photovoltaic tracking bracket fault diagnosis method of the present invention takes into account the influence of wind speed and snow thickness on the motor current, and corrects the motor current warning threshold by means of the wind speed correction coefficient and the snow thickness correction coefficient. The current motor current is compared with the corrected motor current warning threshold, thereby improving the accuracy of fault diagnosis.

[0072] In some embodiments, the method also includes determining that there is a fault in the tracking bracket, obtaining the resistance value between the motor inlet and outlet, and judging whether the resistance value is higher than a preset resistance threshold. If so, it is determined to be a motor fault; otherwise, it is determined to be a bracket structure fault.

[0073] Since photovoltaic tracking brackets are often in high temperature, humid and cold environments, the motors are prone to refrigerant overflow and internal component corrosion. When the above problems occur in the motor, it will directly lead to an increase in the resistance value at the inlet and outlet of the motor. Therefore, by setting the resistance threshold, it is possible to further determine whether the motor has a fault. The value of the preset resistance threshold can be set according to actual conditions, and this application does not impose any restrictions on this. For example, a general tracking bracket uses a DC motor. When the resistance value at the inlet and outlet of the motor exceeds 20Ω, it can be determined that the motor has a fault, otherwise it is determined to be a fault of the bracket structure.

[0074] The photovoltaic tracking bracket fault diagnosis method of the present invention can further diagnose the type of fault through the resistance value between the motor inlet and outlet when diagnosing that the tracking bracket has a fault, which helps maintenance personnel locate the fault.

[0075] The present application also includes a computer-readable medium storing a computer program code, which, when executed by a processor, implements the photovoltaic tracking bracket fault diagnosis method described above.

[0076] When the photovoltaic tracking bracket fault diagnosis method is implemented as a computer program, it can also be stored in a computer-readable storage medium as a product. For example, a computer-readable storage medium may include, but is not limited to, a magnetic storage device (e.g., a hard disk, a floppy disk, a magnetic strip), an optical disk (e.g., a compact disk (CD), a digital versatile disk (DVD)), a smart card, and a flash memory device (e.g., an electrically erasable programmable read-only memory (EPROM), a card, a stick, a key drive). In addition, the various storage media described herein can represent one or more devices and / or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media (and / or storage media) that can store, contain and / or carry code and / or instructions and / or data.

[0077] It should be understood that the embodiments described above are only illustrative. The embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For hardware implementation, the processor may be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and / or other electronic units designed to perform the functions described herein, or a combination thereof.

[0078] Some aspects of the present application may be performed entirely by hardware, entirely by software (including firmware, resident software, microcode, etc.), or by a combination of hardware and software. The above hardware or software may be referred to as "data blocks", "modules", "engines", "units", "components" or "systems". The processor may be one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DAPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, or combinations thereof. In addition, various aspects of the present application may be expressed as computer products located in one or more computer-readable media, which include computer-readable program codes. For example, computer-readable media may include, but are not limited to, magnetic storage devices (e.g., hard disks, floppy disks, tapes ...), optical disks (e.g., compact disks CDs, digital versatile disks DVDs ...), smart cards, and flash memory devices (e.g., cards, sticks, key drives ...).

[0079] A computer-readable medium may include a propagated data signal containing computer program code, such as in baseband or as part of a carrier wave. The propagated signal may have a variety of manifestations, including electromagnetic, optical, etc., or a suitable combination. A computer-readable medium may be any computer-readable medium other than a computer-readable storage medium, which may be connected to an instruction execution system, device or apparatus to communicate, propagate or transmit a program for use. The program code on the computer-readable medium may be propagated via any suitable medium, including radio, cable, fiber optic cable, radio frequency signal, or similar medium, or any combination of the above mediums.

[0080] The basic concepts have been described above. Obviously, for those skilled in the art, the above invention disclosure is only used as an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0081] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0082] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0083] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0084] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions may be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A photovoltaic tracking bracket fault diagnosis method, characterized in that: include: Establishing a motor current and a bracket angle reference table based on the operation data of the tracking bracket history, wherein the motor current and the bracket angle reference table includes a first current reference table and a second current reference table, and the operation data includes the motor current and the bracket angle; Acquire the operation data of the previous cycle of the tracking bracket, and determine the change trend of the bracket angle according to the operation data of the previous cycle, wherein the change trend includes a decreasing angle and an increasing angle; Acquire current operation data of the tracking bracket, wherein the current operation data includes current motor current and current bracket angle; Calculate the motor current warning threshold according to the current support angle, the change trend and the motor current and support angle reference table; Determine whether the current motor current is higher than the motor current warning threshold, and if so, determine that the tracking bracket is faulty; Among them, calculating the motor current warning threshold includes: if the changing trend is a decreasing angle, then searching the corresponding first current warning reference value from the first current reference table according to the current bracket angle, and using the first current warning reference value as the motor current warning threshold; if the changing trend is an increasing angle, then searching the corresponding second current warning reference value from the second current reference table according to the current bracket angle, and using the second current warning reference value as the motor current warning threshold.

2. The method according to claim 1, characterized in that The reference table of motor current and bracket angle is established based on the historical operation data of the tracking bracket, including: Obtaining from the historical operation data a curve of the motor current changing with the angle of the support when the support is operating normally; Determine the maximum motor current corresponding to each bracket angle according to the change curve; The first redundant value is added to each of the maximum motor currents to obtain a current warning reference value corresponding to each bracket angle.

3. The method according to claim 2, characterized in that The change curve includes an angle decreasing curve and an angle increasing curve. The first current reference table is constructed based on the angle decreasing curve. Each bracket angle in the first current reference table corresponds to a first current warning reference value. The second current reference table is constructed based on the angle increasing curve. Each bracket angle in the second current reference table corresponds to a second current warning reference value.

4. The method according to claim 1, characterized in that The method also includes: correcting the motor current warning threshold by using a wind speed correction coefficient and a snow thickness correction coefficient to obtain a final motor current warning threshold.

5. The method according to claim 4, characterized in that Correcting the motor current warning threshold by using the wind speed correction coefficient and the snow thickness correction coefficient includes: Establishing a wind speed correction coefficient table and a snow thickness correction coefficient curve based on the historical operating data and meteorological data; Obtain the current wind speed, and search the corresponding wind speed correction coefficient from the wind speed correction coefficient table according to the current wind speed; Acquire the current snow thickness, and input the current snow thickness into the snow thickness correction coefficient curve to obtain the snow thickness correction coefficient; The motor current warning threshold is multiplied by the wind speed correction coefficient and the snow thickness correction coefficient.

6. The method according to claim 2, characterized in that Also includes: Adding a second redundancy value to each of the maximum motor currents to obtain a motor current protection threshold corresponding to each bracket angle, wherein the second redundancy value is greater than the first redundancy value; Find the motor current protection threshold corresponding to the current angle; Determine whether the current motor current is greater than the motor current protection threshold, and if so, control the motor to stop.

7. The method according to claim 1, characterized in that Also includes: When determining that there is a fault in the tracking bracket, obtain the resistance value between the motor inlet and outlet, and determine whether the resistance value is higher than a preset resistance threshold. If so, it is determined to be a motor fault, otherwise, it is determined to be a bracket structure fault.

8. A photovoltaic tracking bracket fault diagnosis system, characterized in that: include: Meteorological data collection equipment, used to collect meteorological data at the location of the photovoltaic tracking bracket and send the meteorological data to the network control unit; A plurality of tracking bracket controllers, each tracking bracket controller collects operation data of a corresponding tracking bracket and sends the data to a network control unit, wherein the operation data includes a motor current and a bracket angle; A network control unit is respectively connected to the meteorological data acquisition device and the plurality of tracking bracket controllers in communication, and the network control unit comprises: A memory, for storing the meteorological data and the operating data, and storing instructions executable by a processor; A processor, configured to execute the instructions to implement the method according to any one of claims 1 to 7.

9. A computer readable medium storing computer program code, wherein the computer program code, when executed by a processor, implements the method according to any one of claims 1 to 7.

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