A Fault Detection Method and System for a Multi-Point Driven Photovoltaic Tracking Bracket

Abstract

The present invention provides a fault detection method and system for a multi-point drive photovoltaic tracking bracket, including the following steps: obtaining in advance the working current values of the motors corresponding to different environmental parameters in the normal operation state of the multi-point drive photovoltaic tracking system, and establishing an environmental parameter - working current query table; collecting in real time the environmental parameters during the normal operation of the multi-point drive photovoltaic tracking system and the working current values of the motors corresponding to different environmental parameters, and judging whether the working current value of the motor at the current environmental parameter is greater than the maximum value of the working current of the motor corresponding to the environmental parameter in the environmental parameter - working current query table through the environmental parameter - working current query table; if the judgment result is yes, controlling the motor to stop running. Thereby monitoring the operation state of the power transmission module, and shutting down the motor in time after detecting a fault, effectively reducing the probability of spindle damage and improving the operation safety of the corresponding photovoltaic tracking system.

Description

Technical Field

[0001] The present invention relates to the technical field of solar photovoltaic tracking, and particularly to a fault detection method and system for a multi-point drive type photovoltaic tracking bracket. Background Art

[0002] Photovoltaic tracking brackets can automatically adjust the angles of photovoltaic modules according to the changes in the sun's irradiation angle, greatly improving the efficiency of the photovoltaic modules in capturing solar energy.

[0003] As the most common type of photovoltaic tracking bracket, the single-axis tracking bracket is mostly set as a multi-point drive structure at present, that is, a synchronous shaft or other power transmission modules are installed between adjacent drive points to achieve synchronous drive at the positions corresponding to each drive point on the main shaft axis.

[0004] In this regard, the inventor believes that since the multi-point drive type single-axis photovoltaic tracking bracket generally has a laying distance of up to 22 meters or even 45 meters, when the power transmission module fails or the power transmission module is asynchronous with the main shaft, there will be a large difference in the power obtained by different drive points, which will cause the main shaft of the corresponding photovoltaic tracking bracket to be distorted and deformed, and even cause damage to the photovoltaic modules fixed on the main shaft. Summary of the Invention

[0005] The purpose of the present invention is to provide a fault detection method and system for a multi-point drive type photovoltaic tracking bracket, which is used for fault monitoring of the power transmission module of the multi-point drive type photovoltaic tracking bracket, reducing the probability of damage to the main shaft of the corresponding multi-point drive type photovoltaic tracking bracket, and improving the safety of its operation process.

[0006] The technical solution provided by the present invention is as follows:

[0007] On the one hand, the present invention provides a fault detection method for a multi-point drive type photovoltaic tracking bracket. The multi-point drive type photovoltaic tracking system includes a main shaft, a driver, a motor, and a power transmission module. There are at least two drivers. The power generated by the motor is transmitted to at least two drivers through the power transmission module, and the drivers drive the main shaft to rotate. The method includes the following steps:

[0008] Pre-acquire the working current values of the motor corresponding to different environmental parameters in the normal operation state of the multi-point drive type photovoltaic tracking system, and establish an environmental parameter - working current query table;

[0009] Collect the environmental parameters of the multi-point drive type photovoltaic tracking system in its normal operating state and the working current values of the motor corresponding to different environmental parameters. Through the environmental parameter - working current query table, determine whether the working current value of the motor under the current environmental parameters is greater than the maximum value of the working current of the motor corresponding to this environmental parameter in the environmental parameter - working current query table. If the judgment result is yes, control the motor to stop running.

[0010] Through a fault detection method for a multi-point drive type photovoltaic tracking bracket provided by the present invention, since the multi-point drive type photovoltaic tracking system is built in the wild and its laying distance is usually as long as 22 meters or even 45 meters, the natural conditions of its working environment such as wind speed, rainfall, temperature, etc. will affect the stability and durability of the corresponding multi-point drive type photovoltaic tracking system. By monitoring the environmental parameters of the multi-point drive type photovoltaic tracking system and the working current value of the motor, comparing the working current value of the motor under the current environmental parameters with the maximum value of the working current of the motor corresponding to the multi-point drive type photovoltaic tracking system in its normal operating state under this environmental parameter, and judging whether the former is greater than the latter, it is inferred whether the power transmission module fails; if it is greater, it can be inferred that the power transmission module is likely to fail, and the motor is timely controlled to stop running, that is, the drive of the corresponding multi-point drive type photovoltaic tracking system is stopped, which helps to avoid the situation that the main shaft is distorted or even the photovoltaic modules fixed on it are damaged as much as possible, effectively reducing the damage probability of the main shaft of the multi-point drive type photovoltaic tracking bracket and improving the operation safety of the multi-point drive type photovoltaic tracking bracket.

[0011] In some embodiments, the pre-obtaining of the working current values of the motor corresponding to different environmental parameters in the normal operating state of the multi-point drive type photovoltaic tracking system includes:

[0012] Collect the environmental parameters of the multi-point drive type photovoltaic tracking system during operation, monitor and record in real time the working current value of the motor when the multi-point drive type photovoltaic tracking system is operating normally.

[0013] Analyze the mapping relationship between the working current value of the motor during normal operation and the corresponding environmental parameters, and determine the maximum value of the working current of the motor corresponding to different environmental parameters.

[0014] Through a fault detection method for a multi-point driven photovoltaic tracking bracket provided by the present invention, environmental parameters and the working current value of the motor when the multi-point driven photovoltaic tracking system operates normally are collected, and the mapping relationship between the corresponding environmental parameters and the working current value of the motor is analyzed; by monitoring the working current value of the motor under different environmental parameters in real time and comparing the working current value of the motor at the current environmental parameter with the maximum value of the working current of the motor corresponding to the environmental parameter when the multi-point driven photovoltaic tracking system operates normally, the operating state of the multi-point driven photovoltaic tracking system is monitored; the collection operations of the corresponding environmental parameter information and the working current value information of the motor are convenient and easy to implement, which helps to ensure the convenience of implementing the fault detection method for the multi-point driven photovoltaic tracking bracket; at the same time, it helps to ensure the accuracy rate of the fault detection method for the multi-point driven photovoltaic tracking bracket and improve its practicability.

[0015] In some embodiments, the environmental parameters include wind speed, and further include:;

[0016] Monitor and obtain the working current value of the motor when the multi-point driven photovoltaic tracking system operates normally in different wind speed ranges;

[0017] Judge whether the working current value of the motor in the current wind speed range is greater than the maximum value of the working current of the motor corresponding to the current wind speed range when the multi-point driven photovoltaic tracking system is in a normal operating state; if the judgment result is yes, control the motor to stop running.

[0018] Through a fault detection method for a multi-point driven photovoltaic tracking bracket provided by the present invention, since the multi-point driven photovoltaic tracking system is built in the wild and its laying distance is usually dozens of meters long, its running stability and structural stability are closely related to the wind speed in the environment. By analyzing the corresponding relationship between the wind speed and the working current value of the motor and comparing the working current value of the motor in different wind speed ranges with the maximum value of the working current of the motor corresponding to the wind speed range when the multi-point driven photovoltaic tracking system is in a normal operating state, the operating condition of the multi-point driven photovoltaic tracking system can be probably and accurately judged; the wind speed is easy to monitor and the corresponding parameters are easy to collect, which helps to further improve the convenience of implementing the fault detection method for the multi-point driven photovoltaic tracking bracket.

[0019] In some embodiments, before pre-obtaining the working current value of the motor corresponding to different environmental parameters when the multi-point driven photovoltaic tracking system operates normally, the following steps are further included:

[0020] Before monitoring and obtaining the working current value of the motor when the multi-point driven photovoltaic tracking system operates normally in different wind speed ranges, it further includes:

[0021] Determine whether the multi-point drive photovoltaic tracking system is in the strong wind mode. If so, monitor and obtain the working current values of the motor when the multi-point drive photovoltaic tracking system operates normally under different wind speed ranges.

[0022] Through a fault detection method for a multi-point drive photovoltaic tracking bracket provided by the present invention, before obtaining the working current values of the motor corresponding to different wind speed ranges, first determine whether the multi-point drive photovoltaic tracking system is currently in a strong wind environment, that is, determine whether the collected environmental parameters are the environmental parameters that currently affect the normal operation of the multi-point drive photovoltaic tracking system. In this way, it helps to improve the accuracy of monitoring the operating status of the corresponding multi-point drive photovoltaic tracking bracket by this fault detection method. At the same time, it helps to avoid doing useless work as much as possible, so as to save energy and reduce costs.

[0023] In some embodiments, after controlling the motor to stop running, it further includes:

[0024] Control the emission of an equipment fault alarm signal according to the judgment result.

[0025] Through a fault detection method for a multi-point drive photovoltaic tracking bracket provided by the present invention, after detecting a running fault of the multi-point drive photovoltaic tracking system, an equipment fault alarm signal is emitted, which is convenient for the staff to timely discover the equipment fault and timely process the corresponding fault point.

[0026] In some embodiments, before pre-obtaining the working current values of the motor corresponding to different environmental parameters when the multi-point drive photovoltaic tracking system operates normally, the following steps are further included:

[0027] Monitor the drive form configured by the multi-point drive photovoltaic tracking system, and judge whether the drive form is single-point drive or multi-point drive;

[0028] If it is multi-point drive, start monitoring the environmental parameters and the working current value of the motor in the current environment;

[0029] If it is single-point drive, do not start monitoring.

[0030] Through a fault detection method for a multi-point drive photovoltaic tracking bracket provided by the present invention, before starting the monitoring operation, first determine that the drive form configured by the multi-point drive photovoltaic tracking system is multi-point drive, so as to avoid doing useless work as much as possible, which helps to further reduce the energy consumption of the corresponding photovoltaic tracking system and save the enterprise cost. At the same time, it helps to further improve the accuracy of the detection result of this fault detection method for the multi-point drive photovoltaic tracking bracket.

[0031] On the other hand, a fault detection system for a multi-point drive type photovoltaic tracking bracket is also provided, including a main shaft, at least two drivers, a motor and a power transmission module. The main shaft can rotate around its own axis. At least two of the drivers are driven at different positions in the axial direction of the main shaft. The motor is used to drive one of the drivers to operate, and the power transmission module is connected to the remaining drivers. A part of the power generated by the motor drives the main shaft at the corresponding position through the driver, and the other part is transmitted to the remaining drivers through the power transmission module to drive the main shaft at the corresponding position of the remaining drivers. It operates based on any one of the above multi-point drive type photovoltaic tracking bracket fault detection methods, including:

[0032] A data acquisition unit, which includes a first acquisition unit and a second acquisition unit. The first acquisition unit is used to acquire the environmental parameters in the environment where the multi-point drive type photovoltaic tracking system is located, and the second acquisition unit is used to acquire the working current value of the motor.

[0033] A judgment unit, which includes a first sub-judgment unit. The first sub-judgment unit is used to judge whether the working current value of the motor is greater than the maximum value of the working current of the motor corresponding to the current environmental parameters when the current environmental parameters are in place, and obtain a judgment result.

[0034] A control unit, which includes a first sub-control unit. The first sub-control unit is used to control the operation or stop of the motor according to the judgment result made by the first sub-judgment unit.

[0035] The data acquisition unit, the judgment unit and the control unit are electrically or signal-connected to each other.

[0036] In some embodiments, the judgment unit includes a second sub-judgment unit, and the second sub-judgment unit is used to judge the working environment where the multi-point drive type photovoltaic tracking system is located.

[0037] When it is judged that the multi-point drive type photovoltaic tracking system is in a strong wind environment, the first acquisition unit acquires the wind speed parameter in the environment where the multi-point drive type photovoltaic tracking system is located.

[0038] Through a multi-point drive type photovoltaic tracking bracket fault detection system provided by the present invention, a second sub-judgment unit is set to judge the working environment of the multi-point drive type photovoltaic tracking system, and then the data acquisition unit is controlled to collect data of corresponding environmental parameters. That is, according to the current environment, the environmental parameters that have the greatest impact on the running stability and structural stability of the corresponding multi-point drive type photovoltaic tracking system are selected for collection, effectively ensuring the accuracy of the corresponding fault detection operation of the multi-point drive type photovoltaic tracking bracket fault detection system, thereby reducing the damage probability of the main shaft of the multi-point drive type photovoltaic tracking bracket as much as possible and improving the running safety of the multi-point drive type photovoltaic tracking bracket.

[0039] In some embodiments, it further includes a motor control unit, and the control unit is electrically or signal-connected to the motor control unit.

[0040] In some embodiments, it further includes an alarm unit, and the alarm unit is electrically connected to the judgment unit, the control unit, and the data acquisition unit, and is used to select whether to issue an equipment fault alarm signal according to the judgment result made by the first sub-judgment unit.

[0041] Compared with the prior art, the multi-point drive type photovoltaic tracking bracket fault detection method and system provided by the present application have at least one of the following beneficial effects:

[0042] 1. Monitor the working condition of the motor when the multi-point drive type photovoltaic tracking system is operating normally, analyze the mapping relationship between the motor working current value and the corresponding environmental parameters, obtain the maximum value of the motor working current corresponding to different environmental parameters as the comparison parameter of the control system, and real-time monitor the environmental parameters of the working environment where the corresponding multi-point drive type photovoltaic tracking system is located and the motor working current value under the corresponding environmental parameters as the input parameter of the control system. By comparing the current working current value of the motor with the maximum value of the motor working current when the multi-point drive type photovoltaic tracking system is operating normally under the current environmental parameters in real time, the running state of the power transmission module on the corresponding multi-point drive type photovoltaic tracking system is monitored, and the motor is shut down in time after a fault is detected, thereby effectively reducing the damage probability of the main shaft and the photovoltaic modules thereon, improving the running safety of the multi-point drive type photovoltaic tracking bracket, and reducing the maintenance cost of the enterprise for the corresponding multi-point drive type photovoltaic tracking bracket.

[0043] 2. Analyze the influence of wind speed on the running stability and structural stability of the multi-point drive photovoltaic tracking system, collect the environmental wind speed parameters and the motor working current values at the corresponding wind speed sections. By analyzing the corresponding relationship between the wind speed and the motor working current, and comparing the motor working current value in the current wind speed section with the maximum value of the motor working current corresponding to the normal operation state of the multi-point drive photovoltaic tracking system in the corresponding wind speed section, the operation state of the power transmission module can be monitored, which helps to improve the accuracy of fault detection of the multi-point drive photovoltaic tracking bracket. At the same time, the corresponding data collection operation is simple, effectively ensuring the convenience of implementing the corresponding fault detection method for the multi-point drive photovoltaic tracking bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The following will further illustrate the above characteristics, technical features, advantages and their implementation manners of the present solution in a clear and understandable manner in combination with the drawings of the preferred embodiments.

[0045] Figure 1 is the process flow chart mainly reflecting the fault detection method of the multi-point drive photovoltaic tracking bracket in an embodiment of the present invention;

[0046] Figure 2 is the process flow chart mainly reflecting the fault detection method of the multi-point drive photovoltaic tracking bracket in an embodiment of the present invention;

[0047] Figure 3 is the process flow chart mainly reflecting the process of judging the drive form configured by the multi-point drive photovoltaic tracking system in an embodiment of the present invention;

[0048] Figure 4 is the process flow chart mainly reflecting the fault detection method of the multi-point drive photovoltaic tracking bracket when collecting the wind speed as an environmental parameter in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific embodiments of the present invention will be described below with reference to the drawings. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts, and other embodiments can also be obtained.

[0050] To make the drawings concise, only the parts related to the present invention are schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, components with the same structure or function are only schematically shown one of them, or only one of them is marked. In this article, "one" not only means "only this one", but also means "more than one" situation.

[0051] As the most common type of photovoltaic tracking bracket, the flat single-axis tracking bracket is currently mostly set as a multi-point drive structure; for example, in the industry, the multi-point drive photovoltaic tracking system includes a main shaft, at least two drivers, a motor, and a power transmission module; among them, the main shaft can rotate around its own axis and is installed on the column; at least two drivers drive at different positions along the axial direction of the main shaft, each driver includes a first output end and a second output end, the first output end of each parallel driver is connected to the main shaft, and the second output ends of two adjacent drivers are connected to the second output end of another driver through a power transmission module; the motor is used to drive one of the drivers to operate; during operation, part of the power generated by the motor drives the main shaft at the corresponding position through the driver, and the other part is transmitted to the remaining drivers through the power transmission module to drive the main shafts at the corresponding positions of the remaining drivers, so as to achieve multi-point synchronous drive.

[0052] However, since the laying distance of the multi-point drive photovoltaic tracking system in the industry is often up to dozens of meters and it is built in the wild, environmental factors such as wind speed, rainfall, and temperature at the operation site have a crucial impact on its operation stability, durability, etc.; for example, under the action of gusts, the multi-point drive photovoltaic tracking system is prone to deformations, resonances, etc., and damage the power transmission module, and long-term operation may even cause damage such as hidden cracks in the photovoltaic modules carried on it. For example, when the power transmission module is set as a synchronous shaft, affected by gusts, when the connection kits between different segments of the synchronous shaft are damaged or the bolts are loosened, there is a large difference in the power obtained by different drivers, which is likely to cause the main shaft to be distorted and deformed, and even damage the photovoltaic modules fixed on the main shaft. Moreover, as the laying length of the multi-point drive photovoltaic tracking system increases, its influence by the environment becomes more obvious.

[0053] In one embodiment, referring to the Figure 1 of the specification drawings, a fault detection method for a multi-point drive photovoltaic tracking bracket is applicable to the above multi-point drive photovoltaic tracking system, and specifically includes the following steps:

[0054] Pre-acquire the working current values of the motor corresponding to different environmental parameters in the normal operation state of the multi-point drive photovoltaic tracking system, and establish an environmental parameter - working current query table;

[0055] Real-time collect the environmental parameters during the normal operation of the multi-point drive photovoltaic tracking system and the working current values of the motor corresponding to different environmental parameters, and judge whether the working current value of the motor at the current environmental parameter is greater than the maximum value of the working current of the motor corresponding to this environmental parameter in the environmental parameter - working current query table through the environmental parameter - working current query table. If the judgment result is yes, control the motor to stop running.

[0056] In this way, by monitoring and collecting the environmental parameters of the multi-point drive photovoltaic tracking system and the motor operating current value, and comparing the motor operating current value under the current environmental parameters with the maximum motor operating current corresponding to the normal operating state of the multi-point drive photovoltaic tracking system under the current environmental parameters, it is inferred whether a fault occurs in the power transmission system; if it is determined that the former is greater than the latter, it can be inferred that a fault has occurred in the power transmission system, and the motor is controlled to stop running in a timely manner, and the drive of the corresponding multi-point drive photovoltaic tracking system is stopped. In this way, the situation of spindle distortion and deformation, and even damage to the photovoltaic modules carried thereon, is minimized as much as possible, the damage probability of the spindle and the photovoltaic modules thereon is effectively reduced, and the operation safety of the multi-point drive photovoltaic tracking bracket is improved.

[0057] In one embodiment, based on the above embodiment, specifically. Refer to Figure 2 , a fault detection method for a multi-point drive photovoltaic tracking bracket specifically includes the following steps:

[0058] Obtain the maximum motor operating current corresponding to different environmental parameters when the multi-point drive photovoltaic tracking system is operating normally; specifically include:

[0059] Judge the operating environment of the multi-point drive photovoltaic tracking system, collect the environmental parameters of the operation of the multi-point drive photovoltaic tracking system, and monitor and record in real time the motor operating current value when the multi-point drive photovoltaic tracking system is operating normally;

[0060] Analyze the mapping relationship between the motor operating current value during normal operation and the corresponding environmental parameters, determine the maximum motor operating current corresponding to different environmental parameters, and establish an environmental parameter - operating current query table;

[0061] After that, collect in real time the environmental parameters of the multi-point drive photovoltaic tracking system during normal operation and the motor operating current values corresponding to different environmental parameters. Through the environmental parameter - operating current query table, judge whether the motor operating current value at the current environmental parameters is greater than the maximum motor operating current corresponding to the environmental parameters in the environmental parameter - operating current query table. If the judgment result is yes, control the motor to stop running.

[0062] Moreover, for the convenience of the staff to discover and eliminate faults in a timely manner, the following steps may also be included:

[0063] If the judgment result is yes, control the device to send out a fault alarm signal.

[0064] In this way, by sending out a device fault alarm signal after detecting a fault in the operation of the multi-point drive photovoltaic tracking system, it is convenient for the staff to discover the device fault in a timely manner and process the corresponding fault point in a timely manner.

[0065] Optionally, in this embodiment of the present invention, to avoid the system doing useless work and save energy consumption, referring to Figure 3 , before collecting the environmental parameters of the multi-point drive photovoltaic tracking system during operation, monitoring and recording in real time the working current value of the motor when the multi-point drive photovoltaic tracking system is operating normally, the following steps may further be included:

[0066] Monitor the drive form configured for the multi-point drive photovoltaic tracking system, and determine whether the drive form is multi-point drive; if the determination result is yes, start monitoring the environmental parameters and the motor working current value in the current environment; if the determination result is no, do not start monitoring.

[0067] In one embodiment, based on the above embodiment, specifically. Since the multi-point drive photovoltaic tracking system is built in the wild and its laying distance is usually dozens of meters long, its running stability and structural stability are closely related to the wind speed in the environment.

[0068] Therefore, in this embodiment of the present invention, referring to Figure 4 , before collecting the environmental parameters of the multi-point drive photovoltaic tracking system during operation, monitoring and recording in real time the working current value of the motor when the multi-point drive photovoltaic tracking system is operating normally, the following steps are further included:

[0069] Determine whether the multi-point drive photovoltaic tracking system is in a strong wind mode; if so, collect the wind speed value of the operating environment of the multi-point drive photovoltaic tracking system, monitor and record in real time the working current value of the motor when the multi-point drive photovoltaic tracking system is operating normally:

[0070] Analyze the mapping relationship between the working current value of the motor during normal operation and the corresponding wind speed value, determine the maximum value of the working current of the motor when the multi-point drive photovoltaic tracking system is operating normally in different wind speed sections, and establish a wind speed - working current query table.

[0071] After that, then collect in real time the wind speed value when the multi-point drive photovoltaic tracking system is operating normally and the working current value of the motor corresponding to different wind speed sections, and through the wind speed - working current query table, determine whether the working current value of the motor in the current wind speed section is greater than the maximum value of the working current of the motor corresponding to the current wind speed section when the multi-point drive photovoltaic tracking system is in a normal operating state; if the determination result is yes, control the motor to stop running.

[0072] Of course, due to the complex operating environment of the multi-point drive photovoltaic tracking system, natural conditions such as rainfall and temperature will affect the stability and durability of the corresponding multi-point drive photovoltaic tracking system. In the embodiments of the present invention, when the climate conditions at the location of the corresponding multi-point drive photovoltaic tracking system, such as rainfall and temperature, significantly affect the operating state of the corresponding multi-point drive photovoltaic tracking system, other parameters such as rainfall and temperature can also be collected as environmental parameters. At the same time, the motor operating current value when collecting the corresponding environmental parameters is obtained, and the motor operating current value under different environmental parameters is compared with the maximum value of the motor operating current corresponding to the corresponding environmental parameter, and it is judged whether the former is greater than the latter, so as to infer whether a fault occurs in the power transmission system. In this embodiment of the present invention, the specific type of environmental parameter should not be used as a limitation on the protection scope of the present invention.

[0073] To prevent the system from misjudgment, for example, the project site has been in a low wind speed for a long time in the historical period. In this historical period, the multi-point drive photovoltaic tracking system also monitors that the system is operating in the low wind speed section. An environmental parameter - operating current query table is established through the data of past historical periods, and the operating current of the motor is at a relatively low level. If the wind speed changes in a future period and the multi-point drive photovoltaic tracking system monitors that the motor operating current value is greater than the maximum value of the motor operating current under the current environmental parameter (this maximum value is lower than the limit data when the system fails), the system analyzes and controls the motor to stop running under this working condition.

[0074] The limit operating current value of the motor when the system fails is pre-stored in the system in advance. This limit current value needs to consider the model of the multi-point drive photovoltaic tracking system, the geological environment of the project site, and the number of photovoltaic modules.

[0075] When it is judged that the motor operating current value under the current environmental parameter is greater than the maximum value of the motor operating current corresponding to this environmental parameter in the environmental parameter - operating current query table, the maximum value of this operating current is compared with the limit operating current value. If the maximum value of this motor operating current is less than the limit operating current value, the motor continues to operate normally. Preferably, a margin is required for the limit operating current value. If the maximum value of this motor operating current is less than 80% of the limit operating current value, the motor continues to operate normally. By introducing the limit operating current value and analyzing and judging the multi-point drive photovoltaic tracking system with the limit operating current value, it is possible to prevent the system from misjudgment and also prevent the large impact current caused by the frequent start and stop of the motor, improving the motor life and system stability. In addition, through the analysis and judgment of the motor operating current obtained in real time and the established environmental parameter - operating current query table, and the analysis and judgment of the motor operating current obtained in real time and the limit operating current value, a two-layer analysis protection mechanism is formed, further reducing the failure rate and making the system more stable.

[0076] Application Example: When the system monitors that the wind speed range is 8 - 12 m / s, the corresponding current value of the motor is 6 amperes. Through search and analysis, it is found that the current value in this wind speed range is the largest. Considering that the system in the previous project site has the same geology, product model, and number of photovoltaic modules, and the limit current data F when the empirical system fails (which can be preset in the system in advance), and this limit current data F is much larger than 6 amperes. When the system monitors in real time in the future that the working current of the motor is greater than 6 amperes, it will be compared and judged with the limit current data F.

[0077] In one embodiment, a multi - point drive photovoltaic tracking bracket fault detection system operates based on the multi - point drive photovoltaic tracking bracket fault detection method of the above - mentioned embodiment, including a data acquisition unit, a judgment unit, and a control unit, and the three are electrically or signal - connected.

[0078] Specifically, the data acquisition unit includes a first acquisition unit and a second acquisition unit. The first acquisition unit is used to acquire the working current value of the motor, and the second acquisition unit is used to acquire the environmental parameters in the environment where the multi - point drive photovoltaic tracking system is located.

[0079] The judgment unit includes a first sub - judgment unit. The first sub - judgment unit is used to judge whether the working current value of the motor is greater than the maximum value of the working current of the motor corresponding to the current environmental parameters under the current environmental parameters, and obtain a judgment result.

[0080] The control unit includes a first sub - control unit. The first sub - control unit is used to control the motor to run or stop according to the judgment result made by the first sub - judgment unit; that is, if the judgment result of the first sub - judgment unit is yes, the control unit controls the motor to stop running; otherwise, the control unit controls the motor to run normally.

[0081] In one embodiment, based on the above - mentioned embodiment, specifically. The multi - point drive photovoltaic tracking bracket fault detection system further includes a motor control unit. The motor control unit is electrically or signal - connected to the control unit and is used to control the motor to stop or run normally after receiving the judgment result of the first sub - judgment unit.

[0082] In one embodiment, based on the above - mentioned embodiment, specifically. The judgment unit further includes a second sub - judgment unit. The second sub - judgment unit is used to judge the working environment where the multi - point drive photovoltaic tracking system is located;

[0083] For example, when the second sub - judgment unit judges that the multi - point drive photovoltaic tracking system is in a strong - wind environment, the first acquisition unit acquires the wind speed parameter in the environment where the multi - point drive photovoltaic tracking system is located.

[0084] In this embodiment, to determine the working conditions of the multi-point drive photovoltaic tracking bracket fault detection system, the judgment unit may further include a third sub-judgment unit, which is used to judge whether the drive form configured by the multi-point drive photovoltaic tracking system is single-point drive or multi-point drive; when the third sub-judgment unit judges that the drive form configured by the photovoltaic tracking bracket is multi-point drive, the first acquisition unit and the second acquisition unit are started synchronously. The first acquisition unit performs the acquisition operation of the wind speed parameter in the environment where the photovoltaic tracking bracket is located, and the second acquisition unit performs the acquisition operation of the motor working current value corresponding to the current wind speed section.

[0085] In addition, to further reduce the probability of damage to the main shaft and even the photovoltaic modules mounted thereon, the multi-point drive photovoltaic tracking bracket fault detection system may further include an alarm unit, which is electrically connected to the judgment unit and the control unit, and is used to select whether to issue an equipment fault alarm signal according to the judgment result made by the first sub-judgment unit.

[0086] It should be noted that the above embodiments can be freely combined as needed. The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A fault detection method for a multi-point drive photovoltaic tracking bracket. The multi-point drive photovoltaic tracking system includes a main shaft, a driver, a motor, and a power transmission module. There are at least two drivers, and each driver includes a first output end and a second output end. The first output end of each driver is connected to the main shaft, and the second output ends of adjacent drivers are connected to the second output end of another driver through the power transmission module. The motor is used to drive one of the drivers to operate. A part of the power generated by the motor drives the main shaft at the corresponding position through the driver, and another part of the power generated by the motor is transmitted to at least two of the drivers through the power transmission module to drive the main shafts at the corresponding positions of the remaining drivers. At least two of the drivers drive the main shaft to rotate to achieve multi-point synchronous drive. Characterized in that, It includes the following steps: Pre-acquire the working current values of the motor corresponding to different environmental parameters in the normal operation state of the multi-point drive photovoltaic tracking system, and establish an environmental parameter - working current query table; Pre-store the limit working current value of the motor when the system fails into the system. This limit working current value needs to consider the model of the multi-point drive photovoltaic tracking system, the geological environment of the project site, and the number of photovoltaic modules; Real-time collect the environmental parameters in the normal operation state of the multi-point drive photovoltaic tracking system and the working current values of the motor corresponding to different environmental parameters. Through the environmental parameter - working current query table, judge whether the working current value of the motor under the current environmental parameter is greater than the maximum value of the working current of the motor corresponding to this environmental parameter in the environmental parameter - working current query table. If the judgment result is yes, compare the maximum value of the working current of the motor under the current environmental parameter with the limit working current value. If the maximum value of the working current of the motor under the current environmental parameter is less than the limit working current value, keep the motor running normally; when the multi-point drive photovoltaic tracking system monitors that the working current value of the motor is greater than the maximum value of the working current of the motor under the current environmental parameter, and this maximum value is lower than the limit data when the system fails, in this working condition, the system controls the motor to stop running. By establishing an environmental parameter - working current query table and combining the analysis and judgment of the real-time obtained motor working current and the limit working current value, a two-layer analysis and protection mechanism is formed to further reduce the failure rate.

2. A fault detection method for a multi-point drive photovoltaic tracking bracket according to claim 1, Characterized in that, The pre-acquiring the working current values of the motor corresponding to different environmental parameters in the normal operation state of the multi-point drive photovoltaic tracking system includes: Collect the environmental parameters of the multi-point drive photovoltaic tracking system during operation, monitor and record in real time the working current value of the motor when the multi-point drive photovoltaic tracking system is operating normally; Analyze the mapping relationship between the working current value of the motor during normal operation and the corresponding environmental parameters, and determine the maximum value of the working current of the motor corresponding to different environmental parameters.

3. A fault detection method for a multi-point drive photovoltaic tracking bracket according to claim 2, It is characterized in that the environmental parameters include wind speed, and further include: monitoring and acquiring the working current value of the motor when the multi-point drive type photovoltaic tracking system operates normally in different wind speed ranges; judging whether the working current value of the motor in the current wind speed range is greater than the maximum value of the working current of the motor corresponding to the current wind speed range when the multi-point drive type photovoltaic tracking system is in a normal operation state; if the judgment result is yes, controlling the motor to stop running.

4. A fault detection method for a multi-point drive type photovoltaic tracking bracket according to claim 3, It is characterized in that before monitoring and acquiring the working current value of the motor when the multi-point drive type photovoltaic tracking system operates normally in different wind speed ranges, it further includes: judging whether the multi-point drive type photovoltaic tracking system is in a strong wind mode, if so, monitoring and acquiring the working current value of the motor when the multi-point drive type photovoltaic tracking system operates normally in different wind speed ranges.

5. A fault detection method for a multi-point drive type photovoltaic tracking bracket according to claim 1, It is characterized in that after controlling the motor to stop running, it further includes: controlling and sending out an equipment fault alarm signal according to the judgment result.

6. A fault detection method for a multi-point drive type photovoltaic tracking bracket according to claim 1, It is characterized in that before pre-acquiring the working current value of the motor corresponding to different environmental parameters in the normal operation state of the multi-point drive type photovoltaic tracking system, the following steps are further included: monitoring the drive form configured by the multi-point drive type photovoltaic tracking system, and judging whether the drive form is single-point drive or multi-point drive; if it is multi-point drive, start monitoring the environmental parameters and the working current value of the motor in the current environment; if it is single-point drive, do not start monitoring.

7. A fault detection system for a multi-point drive type photovoltaic tracking bracket, including a main shaft, at least two drivers, a motor and a power transmission module, the main shaft can rotate around its own axis, at least two of the drivers drive at different positions in the axial direction of the main shaft, the motor is used to drive one of the drivers to operate, and the power transmission module is connected to the remaining drivers; a part of the power generated by the motor drives the main shaft at the corresponding position through the driver, and the other part is transmitted to the remaining drivers through the power transmission module to drive the main shaft at the corresponding position of the remaining drivers, It is characterized in that operating based on the fault detection method for a multi-point drive type photovoltaic tracking bracket according to any one of claims 1-6, including: a data acquisition unit, the data acquisition unit includes a first acquisition unit and a second acquisition unit, the first acquisition unit is used to acquire the environmental parameters in the environment where the multi-point drive type photovoltaic tracking system is located, and the second acquisition unit is used to acquire the working current value of the motor; a judgment unit, the judgment unit includes a first sub-judgment unit, the first sub-judgment unit is used to judge whether the working current value of the motor is greater than the maximum value of the working current of the motor corresponding to the current environmental parameters when in the current environmental parameters, and obtain a judgment result; A control unit, the control unit includes a first sub-control unit, and the first sub-control unit is configured to control the motor to run or stop running according to the judgment result made by the first sub-judgment unit; The data acquisition unit, the judgment unit and the control unit are electrically or signal-connected to each other.

8. A multi-point drive type photovoltaic tracking bracket fault detection system according to claim 7, characterized in that the judgment unit includes a second sub-judgment unit, and the second sub-judgment unit is configured to judge the working environment where the multi-point drive type photovoltaic tracking system is located; When it is judged that the multi-point drive type photovoltaic tracking system is in a strong wind environment, the first acquisition unit acquires the wind speed parameter in the environment where the multi-point drive type photovoltaic tracking system is located.

9. A multi-point drive type photovoltaic tracking bracket fault detection system according to claim 7, characterized in that it further includes a motor control unit, and the control unit is electrically or signal-connected to the motor control unit.

10. A multi-point drive type photovoltaic tracking bracket fault detection system according to claim 7, characterized in that it further includes an alarm unit, and the alarm unit is electrically connected to the judgment unit, the control unit and the data acquisition unit, and is configured to select whether to issue an equipment fault alarm signal according to the judgment result made by the first sub-judgment unit.

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