A method, device and medium for monitoring overload of yaw system of wind turbine generator set

Abstract

The present application discloses a method, device and medium for monitoring the overload of the yaw system of a wind turbine generator set; it relates to the field of wind power generation and solves the problem of low triggering accuracy of circuit breakers in traditional overload detection of yaw motors. After the yaw system is started, the current values ​​of each yaw motor are collected, and the current average value and uneven load coefficient are calculated in combination with the number of motors. The current uneven load coefficient takes into account the current difference between the yaw motors, which helps to more accurately judge whether there is an overload risk. At the same time, the instantaneous current exceeding the warning value and the uneven load coefficient exceeding the threshold are detected to avoid protection delays caused by relying solely on the average value. By monitoring the current uneven load coefficient and the current value of each yaw motor, the method can respond in time when the yaw motor is instantaneously overloaded, avoid the cumulative damage to the yaw system caused by long-term short-term overloads, and improve the operational safety and reliability of the system.

Description

Technical Field

[0001] The present application relates to the field of wind power generation, and in particular to a method, device and medium for monitoring overload of a yaw system of a wind turbine generator set. Background Art

[0002] The yaw system in a wind turbine is a critical component for ensuring efficient and safe operation. Its core function is to adjust the nacelle's direction by driving the large teeth on the mainframe through the small teeth of the yaw motor, ensuring the impeller is always aligned with the wind to maximize wind energy capture. At the same time, due to factors such as the complex geographical environment and wind conditions at wind turbine sites, as well as complex meteorological conditions such as cold snaps and typhoons, there is a risk of long-term, short-term overloads on the yaw motor, leading to the risk of broken small or large teeth in the yaw system. In more serious cases, this can lead to deformation of the mainframe, seriously affecting the safe operation of the wind turbine and resulting in high maintenance costs, resulting in significant economic and financial losses.

[0003] Traditionally, yaw motor overload detection relies on a circuit breaker with a preset current overload setting. The circuit breaker incorporates a current detection device. When the yaw motor is operating, current flows through the circuit breaker. Once the current exceeds the preset overload threshold, the bimetallic strip within the circuit breaker begins to heat up due to the heat generated by the current. The bimetallic strip is composed of two metals with different thermal expansion coefficients. As the temperature rises, the bimetallic strip bends due to the differential thermal expansion of the two metals. When the bimetallic strip bends to a certain degree, it triggers the circuit breaker's mechanical trip mechanism.

[0004] The overload protection function of the circuit breaker is based on the root mean square (RMS) value or thermal integral of the current, which can only reflect the overall level of the current and cannot capture the instantaneous changes and fluctuations in the current. There is a complex nonlinear relationship between the load of the yaw system and the intensity of wind turbulence. Wind turbulence can cause the instantaneous current of the yaw motor to fluctuate, and these fluctuations may not significantly change the average current value, triggering the circuit breaker and causing long-term short-term overload. Long-term short-term overload can cause large or small teeth in the yaw system to break or the main frame to deform, causing major safety accidents. It is also impossible to lower the overload threshold of the circuit breaker, which can lead to misjudgment and frequent unit shutdowns.

[0005] It can be seen that solving the low triggering accuracy of the circuit breaker in the traditional overload detection monitoring of the yaw motor is a technical problem that needs to be solved urgently by people in this field. Summary of the Invention

[0006] The purpose of the present application is to provide a method, device and medium for monitoring the overload of the yaw system of a wind turbine generator set, so as to solve the problem of low triggering accuracy of the circuit breaker in the traditional monitoring of the overload of the yaw motor.

[0007] To solve the above technical problems, the present application provides a method for monitoring overload of a yaw system of a wind turbine generator set, comprising:

[0008] After the yaw system is started to face the wind, the current values ​​of the current monitoring devices of the yaw system used to monitor the yaw motors are collected;

[0009] Obtaining an average current value of each yaw motor according to the number of motors corresponding to each yaw motor and each current value;

[0010] Obtaining a current uneven load coefficient of the yaw system according to the average current of each yaw motor, the number of motors corresponding to each yaw motor, and the total number of yaw motors;

[0011] Determine whether the current value of any yaw motor is greater than a preset warning value and whether the current uneven load coefficient is greater than a preset uneven load threshold;

[0012] If so, the yaw operation is determined based on the current wind speed, yaw angle, and grid connection status.

[0013] As an optional solution, in the above-mentioned method for monitoring overload of the yaw system of a wind turbine generator set, the current uneven load coefficient is obtained by a first formula;

[0014] The first formula is: ;

[0015] Where U i Indicates the current uneven load coefficient, i=1, 2...n, n represents the total number of yaw motors, Represents the average current of the i-th yaw motor, N i represents the number of motors monitored by the current monitoring device of the i-th path, where I i Indicates the current value of the i-th yaw motor.

[0016] As an optional solution, in the above-mentioned method for monitoring overload of the yaw system of a wind turbine generator set, before determining the yaw operation according to the current wind speed, yaw angle, and grid connection status, the method further includes:

[0017] Get the current wind speed and current yaw angle;

[0018] Determine whether the current wind speed is greater than a preset wind speed threshold, the current yaw angle is greater than a preset yaw angle threshold, and the unit is in a grid-connected state;

[0019] If so, it is determined that the current state is the first state;

[0020] If not, the current state is indeed the second state.

[0021] As an optional solution, in the above-mentioned method for monitoring overload of the yaw system of a wind turbine generator set, if the current state is the first state, determining the yaw operation according to the current wind speed, yaw angle, and grid connection state includes:

[0022] At predetermined intervals, it is determined whether the current value of any yaw motor is greater than a predetermined warning value and the current uneven load coefficient is greater than a predetermined uneven load threshold;

[0023] If so, the number of satisfactions is accumulated;

[0024] When the number of times the condition is satisfied is greater than the first preset number within the first preset time, the wind turbine generator set is controlled to enter a load reduction operation state, and the yaw system is controlled to face the wind again after the load reduction is completed;

[0025] Determine whether after load reduction, the current value of any yaw motor is greater than a preset warning value, and the current uneven load coefficient is greater than a preset uneven load threshold;

[0026] If so, the wind turbine generator set is controlled to perform a protection shutdown and the yaw system is controlled to stop facing the wind.

[0027] As an optional solution, in the above-mentioned method for monitoring overload of the yaw system of a wind turbine generator set, when the number of times the condition is satisfied is greater than a first preset number within a first preset time, the wind turbine generator set is controlled to enter a load-reduced operation state, and the yaw system is controlled to face the wind again after the load reduction is completed, the method further includes:

[0028] Stop the yaw system operation;

[0029] After the second preset time has passed, the yaw system is controlled to start, and the step of collecting current values ​​of the current monitoring devices of the yaw system for monitoring the yaw motors of the yaw system is entered.

[0030] As an optional solution, in the above-mentioned method for monitoring overload of the yaw system of a wind turbine generator set, if the current state is the second state, determining the yaw operation according to the current wind speed, yaw angle, and grid connection state includes:

[0031] At predetermined intervals, it is determined whether the current value of any yaw motor is greater than a predetermined warning value and the current uneven load coefficient is greater than a predetermined uneven load threshold;

[0032] If yes, the number of satisfied times is accumulated and the yaw system is stopped;

[0033] After the second preset time, the yaw system is controlled to start, and the step of collecting the current value of each current monitoring device of the yaw system for monitoring each yaw motor is entered;

[0034] When the number of times the condition is satisfied is greater than a first preset number within a first preset time, the wind turbine generator set is controlled to perform a protection shutdown and the yaw system is controlled to stop facing the wind.

[0035] As an optional solution, in the above-mentioned method for monitoring overload of the yaw system of a wind turbine generator set, before controlling the yaw system to start facing the wind, the method further includes:

[0036] Determine whether the power supply of the yaw system is abnormal, and whether there is a fault state of yaw too fast, yaw too slow, or high yaw pressure;

[0037] If not, the process proceeds to the step of controlling the yaw system to start facing the wind.

[0038] To solve the above technical problems, the present application further provides a wind turbine yaw system overload monitoring device, comprising:

[0039] The acquisition module is used to control the yaw system to start facing the wind and collect the current values ​​of various current monitoring devices used to monitor each yaw motor of the yaw system;

[0040] A first calculation module is used to obtain the average current of each yaw motor according to the number of motors corresponding to each yaw motor and each current value;

[0041] A second calculation module is used to obtain a current uneven load coefficient of the yaw system according to the average current of each yaw motor, the number of motors corresponding to each yaw motor, and the total number of yaw motors;

[0042] A judgment module is used to judge whether the current value of any yaw motor is greater than a preset warning value and whether the current uneven load coefficient is greater than a preset uneven load threshold; if so, triggering the adjustment module;

[0043] The adjustment module is used to determine the yaw operation according to the current wind speed, yaw angle, and grid connection status.

[0044] To solve the above technical problems, the present application further provides a wind turbine yaw system overload monitoring device, comprising:

[0045] memory for storing computer programs;

[0046] The processor is configured to implement the steps of the above-mentioned method for monitoring overload of the yaw system of a wind turbine generator set when executing the computer program.

[0047] To solve the above technical problems, the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned wind turbine yaw system overload monitoring method are implemented.

[0048] The wind turbine yaw system overload monitoring method provided in the present application collects the current values ​​of each yaw motor after the yaw system is started, and calculates the current average value and the uneven load coefficient in combination with the number of motors. The current uneven load coefficient takes into account the current difference between the yaw motors, which helps to more accurately determine whether there is an overload risk. Compared with the traditional circuit breaker that only monitors the total circuit average value, it can detect local overload risks earlier. At the same time, it detects the instantaneous current exceeding the warning value and the uneven load coefficient exceeding the threshold value to avoid protection delays caused by relying solely on the average value. By monitoring the current uneven load coefficient and the current values ​​of each yaw motor, the method can respond in time when the yaw motor is instantaneously overloaded, and determine the yaw operation that needs to be performed based on the current wind speed, yaw angle and grid-connected status. This helps to avoid the cumulative damage to the yaw system caused by long-term short-term overloads and improve the operational safety and reliability of the system.

[0049] In addition, the present application also provides a device and a medium, which correspond to the above-mentioned method for monitoring overload of the yaw system of a wind turbine generator set, and have the same effect as above. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0051] Figure 1 A flow chart of a method for monitoring overload of a yaw system of a wind turbine generator set provided in an embodiment of the present application;

[0052] Figure 2 A flow chart of another method for monitoring overload of a yaw system of a wind turbine generator set provided in an embodiment of the present application;

[0053] Figure 3 A structural diagram of a yaw system overload monitoring device for a wind turbine generator set provided in an embodiment of the present application;

[0054] Figure 4 This is a structural diagram of another wind turbine yaw system overload monitoring device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0056] The core of this application is to provide a method, device and medium for monitoring overload of the yaw system of a wind turbine generator set.

[0057] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0058] To solve the above problems, the present invention provides a method for monitoring the overload of the yaw system of a wind turbine generator set. Figure 1 As shown, including:

[0059] S11: After the yaw system is started to face the wind, the current value of each current monitoring device of the yaw system used to monitor each yaw motor is collected;

[0060] S12: Calculating the average current value of each yaw motor according to the number of motors corresponding to each yaw motor and each current value;

[0061] S13: obtaining a current uneven load coefficient of the yaw system according to the average current of each yaw motor, the number of motors corresponding to each yaw motor, and the total number of yaw motors;

[0062] S14: Determine whether the current value of any yaw motor is greater than a preset warning value and whether the current uneven load coefficient is greater than a preset uneven load threshold;

[0063] S15: If yes, determine the yaw operation according to the current wind speed, yaw angle, and grid connection status.

[0064] This embodiment is applicable when the wind turbine generator system is operating normally and requires yaw operation to align with the wind. In step S11, controlling the yaw system to start aligning with the wind involves issuing a command from the main control system to initiate the yaw system operation and adjust the nacelle's orientation to align the rotors with the wind, thereby maximizing wind energy capture. Current values ​​collected from each current monitoring device used to monitor each yaw motor in the yaw system are collected using intelligent current monitoring devices installed in the yaw motor control circuit. These devices can collect the three-phase current signals of the yaw motors in real time and, through high-frequency sampling, capture the details of the current waveforms, providing the main control system with more comprehensive yaw system status information. Each yaw motor is equipped with a current detection device to collect current information, and each yaw motor corresponds to multiple motors. In this step, the intelligent current monitoring devices collect the yaw motor current values ​​in real time, providing basic data for subsequent overload monitoring. Because the yaw motors only operate after the yaw system starts aligning with the wind, collecting current values ​​at this time is meaningful. Therefore, current value collection is performed after the yaw system starts aligning with the wind. Specifically, obtain the original current value D monitored by the intelligent current monitoring device i , according to the original current value, the current value Ii , i.e. the effective value of the current, is calculated mainly by the conversion principle of the monitoring equipment, for example, , whose coefficient is determined according to the monitoring equipment.

[0065] In step S12, the number of motors corresponding to each yaw motor refers to the number of motors actually operating in each yaw motor involved in the yaw operation, which may vary depending on the unit's design and operating status. Each current value is the current value of each yaw motor collected in step S11. "Determining the average current value of each yaw motor" means calculating the average current value of each yaw motor. The specific formula can be expressed as: average current = (current value of each yaw motor) / (number of motors corresponding to each yaw motor). In this step, calculating the average current value achieves a preliminary quantification of the load condition of each yaw motor, facilitating subsequent analysis of the overall load condition of the yaw system.

[0066] In step S13, the current uneven load coefficient of the yaw system is obtained based on the current average value of each yaw motor, the number of motors corresponding to each yaw motor, and the total number of yaw motors. The total number of yaw motors here refers to the total number of yaw motors in the entire yaw system. For example, a wind turbine may have several yaw motors working together. By calculating the degree of difference between the current average value of each yaw motor and the total average current, combined with the number of motors and the total number of yaw motors, the current uneven load coefficient of the yaw system can be obtained. This coefficient can reflect whether the current distribution between the yaw motors is balanced, and is one of the important indicators for judging whether the yaw system has an overload risk. For example, when the load of a certain yaw motor suddenly increases due to factors such as local wind turbulence, its current average value will be significantly higher than that of other motors, thereby increasing the current uneven load coefficient, indicating that the system may have an overload risk.

[0067] In step S14, it is determined whether the current value of any yaw motor is greater than the preset warning value and whether the current uneven load coefficient is greater than the preset uneven load threshold. The preset warning value here is a current threshold value set based on factors such as the rated current of the yaw motor, the long-term and short-term overload tolerance, etc., and is used to determine whether a single yaw motor is abnormally overloaded. The preset uneven load threshold is a coefficient threshold value set according to the normal operating current distribution law of the yaw system, and is used to determine whether the current distribution of the entire yaw system is uniform. By simultaneously judging these two indicators, the overload condition of the yaw motor can be monitored more comprehensively. If the current value of any yaw motor exceeds the warning value, but the current uneven load coefficient does not exceed the threshold, it may only be a momentary fluctuation of the single motor, and does not necessarily mean that the entire system is at risk of serious overload; on the contrary, if the current uneven load coefficient exceeds the threshold, even if the current of the single motor does not exceed the warning value, it may also mean that the system has a potential overload problem, which requires further analysis and processing.

[0068] If yes, in step S15, yaw operation is determined based on the current wind speed, yaw angle, and grid-connected status. Step S14 determines the presence of an overload risk. The current wind speed can be measured in real time using an ultrasonic anemometer, which reflects the wind conditions currently affecting the wind turbine. For example, in strong winds, the load on the yaw motor may be greater, requiring more caution in handling overload issues. The yaw angle, which refers to the angle between the nacelle and the wind direction, determines the direction and magnitude of yaw motor adjustment. A larger yaw angle may mean that the yaw motor requires greater torque to adjust the nacelle's direction, posing a relatively high risk of overload. Grid-connected status refers to whether the wind turbine is connected to the grid and generating electricity. In this grid-connected state, the turbine's operational stability significantly impacts the grid, prioritizing the safe and stable operation of the turbine. Based on these conditions, the main control system can formulate different yaw operation strategies, such as adjusting the yaw speed, pausing yaw, or entering a reduced-load state, to prevent damage to the yaw motor due to overload.

[0069] Through the overload monitoring method for the yaw system of a wind turbine generator set provided by the present application, after the yaw system is started, the current values ​​of each yaw motor are collected, and the current average value and the uneven load coefficient are calculated in combination with the number of motors. The current uneven load coefficient takes into account the current difference between the yaw motors of each path, which helps to more accurately judge whether there is an overload risk. Compared with the traditional circuit breaker that only monitors the average value of the total circuit, it can detect local overload risks earlier. At the same time, it detects the instantaneous current exceeding the warning value (capturing short-term fluctuations) and the uneven load coefficient exceeding the threshold value (reflecting system load imbalance), avoiding protection delays caused by relying solely on the average value. By monitoring the current uneven load coefficient and the current values ​​of each yaw motor, the present method can respond in time when the yaw motor is instantaneously overloaded, and determine the yaw operation that needs to be performed based on the current wind speed, yaw angle and grid-connected status. This helps to avoid the cumulative damage to the yaw system caused by long-term short-term overloads, and improves the operational safety and reliability of the system.

[0070] Further, specifically, the current uneven load coefficient is obtained by the first formula;

[0071] The first formula is: ;

[0072] Where U i Indicates the current uneven load coefficient, i=1, 2...n, n represents the total number of yaw motors, Represents the average current of the i-th yaw motor, N i Indicates the number of motors monitored by the i-th current monitoring device, where I i Indicates the current value of the i-th yaw motor.

[0073] U iThe current uneven load coefficient of the i-th yaw motor is used to measure the degree of deviation of the yaw motor current from the average current of the entire yaw system. It is an important indicator for evaluating whether there is an overload risk for the yaw motor.

[0074] In this embodiment, the i value corresponds to different yaw motor branches in the yaw system, covering all yaw motor branches of the entire yaw system, ensuring a comprehensive evaluation of the current distribution of the entire system.

[0075] represents the average current of the i-th yaw motor, Taking into account the current distribution of the entire yaw system, the average current of the entire yaw system is obtained by adding the average current of each yaw motor and dividing it by the total number of motors. This reflects the average load level of the entire yaw system under the current operating state.

[0076] By calculating the current uneven load coefficient, the overload risk of each yaw motor can be accurately assessed. In actual operation, even if the current of each yaw motor does not exceed the rated value, if the current distribution is uneven, some motors may be in an overload state for a long time, and traditional monitoring methods often have difficulty detecting this potential overload risk. For example, in a yaw system, the load of a yaw motor suddenly increases due to factors such as local wind turbulence. Although its current value does not exceed the rated value, the current uneven load coefficient increases significantly. This indicator can promptly detect the overload risk of the yaw motor and take measures to deal with it in advance, avoiding major faults such as motor damage, tooth breakage, and main frame deformation caused by long-term overload.

[0077] Furthermore, specifically, before determining the yaw operation according to the current wind speed, yaw angle, and grid connection status, the method further includes:

[0078] Get the current wind speed and current yaw angle;

[0079] Determine whether the current wind speed is greater than a preset wind speed threshold, the current yaw angle is greater than a preset yaw angle threshold, and the unit is in a grid-connected state;

[0080] If so, it is determined that the current state is the first state;

[0081] If not, the current state is indeed the second state.

[0082] An ultrasonic anemometer measures the current wind speed in real time. Wind speed is a key factor affecting the yaw motor load. Higher wind speeds typically require greater torque to adjust the nacelle's direction. This can also be accompanied by more complex wind conditions, such as turbulence, which can affect the motor's operating status. Accurately acquiring current wind speed data provides a foundation for the main control system's subsequent judgments and decisions.

[0083] The main control system calculates the current yaw angle based on wind direction data measured by the ultrasonic anemometer and the current orientation of the nacelle. The yaw angle reflects the angle between the nacelle and the wind direction and is a key parameter for determining whether the yaw system needs adjustment and the extent of the adjustment. A larger yaw angle requires a larger adjustment of the yaw motor, which may also increase its load. Therefore, accurately determining the current yaw angle is crucial for determining the status of the yaw system.

[0084] The preset wind speed threshold and yaw angle threshold are determined based on the wind turbine's design parameters, operating experience, and safety requirements. These thresholds serve as key references for determining the yaw system's status and are used to distinguish between different operating conditions.

[0085] After the main control system obtains the current wind speed and yaw angle, it compares these parameters with the preset thresholds. If the current wind speed is greater than the preset wind speed threshold and the current yaw angle is greater than the preset yaw angle threshold, and the unit is in the grid-connected state, it is determined that the current state is the first state. In this state, the yaw motor may face a higher risk of overload, and a more cautious and strict yaw operation strategy needs to be adopted, such as appropriately reducing the unit load, limiting the yaw speed, etc., to ensure the safe operation of the yaw motor. Conversely, if the above conditions are not met at the same time, it is determined that the current state is the second state. In the second state, the overload risk of the yaw motor is relatively low, and it can be adjusted according to the conventional yaw operation strategy, but the relevant parameters still need to be continuously monitored to respond to possible overload risks in a timely manner.

[0086] By accurately determining the status and selecting the corresponding yaw control strategy, the probability of damage to the yaw motor due to overload is reduced, the service life of the yaw system is extended, and the maintenance cost and equipment replacement cost are reduced.

[0087] According to the above embodiment, in a specific embodiment, if the current state is the first state, determining the yaw operation according to the current wind speed, yaw angle, and grid connection state includes:

[0088] At preset intervals, it is determined whether the current value of any yaw motor is greater than a preset warning value, and whether the current uneven load coefficient is greater than a preset uneven load threshold;

[0089] If so, the number of satisfactions is accumulated;

[0090] When the number of times the condition is satisfied is greater than the first preset number within the first preset time, the wind turbine generator set is controlled to enter a load reduction operation state, and the yaw system is controlled to face the wind again after the load reduction is completed;

[0091] Determine whether the current value of any yaw motor after load reduction is greater than the preset warning value and the current uneven load coefficient is greater than the preset uneven load threshold;

[0092] If so, the wind turbine generator set is controlled to perform a protection shutdown and the yaw system is controlled to stop facing the wind.

[0093] At preset intervals (this interval is set based on the yaw motor's operating characteristics and the monitoring system's capabilities, such as 1 second or 5 seconds), the main control system determines whether the current value of any yaw motor exceeds the preset warning value, and the current uneven load factor exceeds the preset uneven load threshold. This determination is based on real-time collected yaw motor current data and the calculated current uneven load factor, allowing for prompt detection of yaw motor overload risks.

[0094] If the above conditions are met, the main control system will accumulate the number of times they are met. The purpose of the accumulation is to count the frequency of yaw motor overload risks within a certain period of time, providing a basis for subsequent higher-level response measures. For example, if the preset interval is 5 seconds, the main control system will check every 5 seconds and increase the cumulative number by 1 if the condition is met.

[0095] If the cumulative number of times the condition is met exceeds a first preset number (e.g., three, five, etc.) within a first preset time (e.g., one minute, five minutes), the main control system controls the wind turbine to enter a reduced-load operation state. Reduced-load operation involves adjusting the wind turbine's operating parameters (e.g., pitch angle, generator speed, etc.) to reduce the turbine's power generation load, thereby alleviating the load on the yaw motor. This measure aims to protect the yaw motor by reducing the load in the event of frequent overload risks, preventing damage from prolonged overload.

[0096] After the wind turbine completes load reduction, the main control system controls the yaw system again to align with the wind. This operation ensures that the turbine can still accurately align with the wind direction after the load is reduced to maximize wind energy capture. At the same time, the system continues to monitor the operating status of the yaw motor to determine whether the overload risk still exists.

[0097] After facing the wind again, the main control system continues to determine whether the condition that "the current value of any yaw motor is greater than the preset warning value, and the current uneven load coefficient is greater than the preset uneven load threshold" is met. If the condition is still met at this time, it means that even in the load-reduced operation state, the yaw motor is still at risk of overload. When the overload condition is still met after facing the wind again, the main control system controls the wind turbine to perform a protective shutdown and controls the yaw system to stop facing the wind. Protective shutdown is a more stringent response measure. By stopping the operation of the unit, the overload risk of the yaw motor is completely eliminated, and major faults such as damage to the yaw motor, broken teeth, and deformation of the main frame caused by overload are prevented, thereby ensuring the safe operation of the wind turbine.

[0098] In the first state, through the above detailed yaw operation steps, the wind turbine generator set can effectively reduce the overload risk of the yaw motor under complex operating conditions, ensure the safe and stable operation of the unit, and at the same time optimize the operating efficiency, provide early warning and prevent failures, which has important practical application value.

[0099] According to the above embodiment, in a specific embodiment, when the number of times the condition is satisfied is greater than a first preset number within a first preset time, the wind turbine generator set is controlled to enter a load reduction operation state, and the yaw system is controlled to face the wind again after the load reduction is completed, which also includes:

[0100] Stop the yaw system operation;

[0101] After the second preset time has passed, the yaw system is controlled to start, and the step of collecting current values ​​of various current monitoring devices of the yaw system for monitoring various yaw motors is entered.

[0102] The above embodiment determines whether the current value of any yaw motor is greater than the preset warning value, and the current uneven load coefficient is greater than the preset uneven load threshold. When these two conditions are met at the same time, it indicates that the yaw motor may be at risk of overload. Immediately control the yaw system to stop running. This measure is intended to quickly interrupt the load of the yaw motor and prevent it from continuing to run in an overloaded state, thereby avoiding possible damage. After the yaw system is shut down, the main control system performs a counting operation to record the number of times the overload condition is met. The purpose of counting is to count the frequency of overload risks of the yaw motor within a certain period of time, and provide a basis for subsequent higher-level response measures.

[0103] After a second preset time (such as 10 seconds, 30 seconds, etc.) has passed, the main control system controls the yaw system to restart, providing sufficient cooling and recovery time for the yaw motor.

[0104] After the yaw system restarts, the main control system again determines whether the following conditions are met: "The current value of any yaw motor is greater than the preset warning value, and the current uneven load coefficient is greater than the preset uneven load threshold." If these conditions are still met, the yaw motor still faces an overload risk after the restart. If the overload condition is still met after the yaw system restarts, the main control system continues to count the number of times the overload condition has been met.

[0105] If the cumulative number of times the condition is met exceeds a first preset number (e.g., three, five, etc.) within a first preset time (e.g., one minute, five minutes), the main control system controls the wind turbine to enter a reduced-load operation state. Reduced-load operation refers to reducing the generator's power generation load by adjusting the wind turbine's operating parameters (e.g., pitch angle, generator speed, etc.), thereby alleviating the load on the yaw motor.

[0106] After the wind turbine completes the load reduction operation, the main control system controls the yaw system again to perform wind-facing operations to ensure that the unit can accurately align with the wind direction after the load is reduced and maximize the capture of wind energy. After the load reduction is completed, the main control system continues to determine whether the condition of "the current value of any yaw motor is greater than the preset warning value, and the current uneven load coefficient is greater than the preset uneven load threshold" is met. If the condition is still met at this time, it means that the yaw motor still has an overload risk even in the load reduction operation state. When the overload condition is still met after the load reduction operation, the main control system controls the wind turbine to perform a protective shutdown and stop the yaw system from facing the wind. Protective shutdown is a more stringent response measure. By stopping the operation of the unit, the overload risk of the yaw motor is completely eliminated, and major faults such as yaw motor damage, broken teeth, and main frame deformation caused by overload are prevented, thereby ensuring the safe operation of the wind turbine.

[0107] According to the above embodiment, in a specific embodiment, if the current state is the second state, the yaw operation is determined according to the current wind speed, yaw angle, and grid connection state, including:

[0108] At preset intervals, it is determined whether the current value of any yaw motor is greater than a preset warning value, and whether the current uneven load coefficient is greater than a preset uneven load threshold;

[0109] If yes, the number of satisfied times is accumulated and the yaw system is stopped;

[0110] After a second preset time, the yaw system is controlled to start, and the step of collecting current values ​​of various current monitoring devices of the yaw system for monitoring various yaw motors is started;

[0111] When the number of times the condition is satisfied is greater than a first preset number within a first preset time, the wind turbine generator set is controlled to perform a protection shutdown and the yaw system is controlled to stop facing the wind.

[0112] When it is determined that the current state is the second state (i.e., the current wind speed, yaw angle, and grid-connected state do not meet the conditions of the first state), the implementation of the yaw operation needs to be dynamically adjusted based on the real-time monitored yaw motor current value and current uneven load factor.

[0113] At preset intervals (such as 1 second, 5 seconds, etc.), the main control system determines whether the current value of any yaw motor exceeds the preset warning value and the current uneven load factor exceeds the preset uneven load threshold. This determination is based on real-time yaw motor current data and the calculated current uneven load factor to promptly detect any yaw motor overload risks. The preset warning value and uneven load threshold are determined based on the yaw motor's design parameters, operating experience, and safety requirements.

[0114] If the above conditions are met, the main control system counts the number of times these conditions are met and immediately stops the yaw system. The purpose of this count is to measure how often the yaw motor overload risk occurs within a certain period of time. If the overload condition is met, the yaw system is immediately stopped to quickly interrupt the load on the yaw motor and prevent it from continuing to operate in an overloaded state, thereby avoiding possible damage.

[0115] After the yaw system stops, the main control system sets a second preset time (such as 10 seconds or 30 seconds) to keep the yaw system stopped. After the second preset time, the main control system controls the yaw system to restart and begins collecting current values ​​from the current monitoring devices used to monitor each yaw motor. Restarting the yaw system allows the system to continue monitoring the yaw motor's operating status and verify the motor's real-time load after restart.

[0116] After restarting, the main control system continues to determine whether the following conditions are met: "The current value of any yaw motor is greater than the preset warning value, and the current uneven load coefficient is greater than the preset uneven load threshold." If the conditions are still met, the system continues to accumulate the number of times the conditions are met. If the cumulative number of times the conditions are met exceeds a first preset number (such as 3 or 5 times) within a first preset time (such as 1 minute or 5 minutes), the main control system controls the wind turbine to perform a protective shutdown and stops the yaw system from facing the wind. This prevents major failures such as yaw motor damage, tooth breakage, and mainframe deformation caused by overload, ensuring the safe operation of the wind turbine.

[0117] According to the above embodiment, in a specific embodiment, before controlling the yaw system to start facing the wind, the method further includes:

[0118] Determine whether the power supply of the yaw system is abnormal, and whether there is a fault state such as yaw too fast, yaw too slow, or high yaw pressure;

[0119] If not, the process proceeds to the step of controlling the yaw system to start facing the wind.

[0120] In this embodiment, voltage sensors installed in the yaw system power supply circuit monitor the supply voltage in real time to ensure it is within the specified normal range. Excessively high or low voltages are considered power supply anomalies. Current sensors detect the current in the yaw system power supply circuit. Current values ​​outside the normal operating range may indicate a power supply anomaly, such as a short circuit or overload. A phase detection device ensures that the phase difference between the three-phase voltages remains within the normal range.

[0121] In addition, a speed sensor installed in the yaw system can measure the actual yaw motor speed or yaw angle change rate in real time to determine the yaw speed. The measured value is compared with the preset normal yaw speed range. Yawing too quickly can cause increased vibration, accelerated wear of mechanical components, and even cause the unit to lose control. Yawing too slowly can affect the unit's response to wind speed and reduce power generation efficiency.

[0122] The hydraulic system's operating pressure can also be monitored in real time using a pressure sensor. The monitored pressure value is compared with the preset normal pressure range. Excessive yaw pressure can cause serious faults such as hydraulic system seal damage, hydraulic oil leakage, or even hydraulic cylinder rupture.

[0123] This embodiment detects key parameters such as power supply, yaw speed, and yaw pressure before startup, thereby being able to promptly detect potential fault hazards and avoid starting the yaw system in a faulty state, thereby improving the reliability of the yaw system, reducing sudden failures during operation, and ensuring the stable operation of the wind turbine generator set.

[0124] Figure 2 A flow chart of another method for monitoring overload of a yaw system of a wind turbine generator set provided in an embodiment of the present application is shown as follows: Figure 2 As shown, after startup, the preset program is executed to collect unit signals for subsequent calculations and unit status judgment, etc., and after the yaw system is aligned with the wind, the current value is first judged, and a warning signal is issued in case of overcurrent. Based on different unit states, different measures are taken when the current uneven load coefficient is greater than the preset uneven load threshold, as described in the above embodiment.

[0125] In the above embodiments, a method for monitoring overload of a yaw system of a wind turbine generator set is described in detail. This application also provides corresponding embodiments of a device for monitoring overload of a yaw system of a wind turbine generator set. It should be noted that this application describes embodiments of the device from two perspectives: one based on functional modules and the other based on hardware.

[0126] Based on the perspective of functional modules, Figure 3This is a structural diagram of a wind turbine yaw system overload monitoring device provided in an embodiment of the present application, such as Figure 3 As shown, a wind turbine yaw system overload monitoring device includes:

[0127] The acquisition module 11 is used to control the yaw system to start facing the wind and collect the current values ​​of various current monitoring devices used to monitor various yaw motors of the yaw system;

[0128] A first calculation module 12 is configured to obtain an average current value of each yaw motor according to the number of motors corresponding to each yaw motor and the current values;

[0129] The second calculation module 13 is used to obtain the current uneven load coefficient of the yaw system according to the average current of each yaw motor, the number of motors corresponding to each yaw motor, and the total number of yaw motors;

[0130] The judgment module 14 is used to judge whether the current value of any yaw motor is greater than the preset warning value and whether the current uneven load coefficient is greater than the preset uneven load threshold; if so, the adjustment module is triggered;

[0131] The adjustment module 15 is used to determine the yaw operation according to the current wind speed, yaw angle, and grid connection status.

[0132] Since the embodiments of the apparatus part correspond to the embodiments of the method part, please refer to the description of the embodiments of the method part for the embodiments of the apparatus part, and they will not be repeated here.

[0133] Figure 4 This is a structural diagram of another wind turbine yaw system overload monitoring device provided in an embodiment of the present application, such as Figure 4 As shown, the wind turbine yaw system overload monitoring device includes: a memory 20 for storing a computer program;

[0134] The processor 21 is configured to implement the steps of the method for obtaining user operation habit information in the above embodiment (wind turbine yaw system overload monitoring method) when executing the computer program.

[0135] The wind turbine generator set yaw system overload monitoring device provided in this embodiment may include but is not limited to a mobile terminal, a personal computer, a workstation, etc.

[0136] The processor 21 may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor 21 may be implemented in at least one of the following hardware forms: a digital signal processor (DSP), a field-programmable gate array (FPGA), or a programmable logic array (PLA). The processor 21 may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as a central processing unit (CPU); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor 21 may be integrated with a graphics processing unit (GPU), which is responsible for rendering and drawing the content required to be displayed on the display screen. In some embodiments, the processor 21 may also include an artificial intelligence (AI) processor, which is responsible for processing computing operations related to machine learning.

[0137] The memory 20 may include one or more computer-readable storage media, which may be non-transitory. The memory 20 may also include a high-speed random access memory, and a non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In this embodiment, the memory 20 is at least used to store the following computer program 201, wherein, after the computer program is loaded and executed by the processor 21, it can implement the relevant steps of the wind turbine yaw system overload monitoring method disclosed in any of the aforementioned embodiments. In addition, the resources stored in the memory 20 may also include an operating system 202 and data 203, etc., and the storage method may be temporary storage or permanent storage. Among them, the operating system 202 may include Windows, Unix, Linux, etc. The data 203 may include but is not limited to data involved in implementing the wind turbine yaw system overload monitoring method, etc.

[0138] In some embodiments, the wind turbine generator set yaw system overload monitoring device may further include a display screen 22 , an input / output interface 23 , a communication interface 24 , a power supply 25 , and a communication bus 26 .

[0139] Those skilled in the art will understand that Figure 4 The structure shown in the figure does not constitute a limitation on the overload monitoring device for the yaw system of a wind turbine generator set, and may include more or fewer components than those shown in the figure.

[0140] The embodiment of the present application provides a device for monitoring an overload of a yaw system of a wind turbine generator set, comprising a memory and a processor. When the processor executes a program stored in the memory, it can implement the following method: a method for monitoring an overload of a yaw system of a wind turbine generator set.

[0141] Finally, the present application also provides an embodiment corresponding to a computer-readable storage medium. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps described in the embodiment of the wind turbine generator set yaw system overload monitoring method.

[0142] It is understandable that if the method in the above embodiment is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and executes all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program code.

[0143] The computer-readable storage medium provided in this embodiment stores a computer program. When a processor executes the program, the following method can be implemented: a method for monitoring overload of a yaw system of a wind turbine generator set.

[0144] The above is a detailed introduction to the method, device and medium for monitoring the overload of the yaw system of a wind turbine provided by the present application. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

[0145] It should also be noted that, in this specification, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

Claims

1. A method for monitoring overload of a yaw system of a wind turbine generator set, characterized in that: include: After the yaw system is started to face the wind, the current values ​​of the current monitoring devices of the yaw system used to monitor the yaw motors are collected; Obtaining an average current value of each yaw motor according to the number of motors corresponding to each yaw motor and each current value; Obtaining a current uneven load coefficient of the yaw system according to the average current of each yaw motor, the number of motors corresponding to each yaw motor, and the total number of yaw motors; Determine whether the current value of any yaw motor is greater than a preset warning value and whether the current uneven load coefficient is greater than a preset uneven load threshold; If so, the yaw operation is determined based on the current wind speed, yaw angle, and grid connection status; The current uneven load coefficient is obtained by the first formula; The first formula is: ; Where U i Indicates the current uneven load coefficient, i=1, 2...n, n represents the total number of yaw motors, Represents the average current of the i-th yaw motor, N i represents the number of motors monitored by the current monitoring device of the i-th path, where I i Indicates the current value of the i-th yaw motor.

2. The method for monitoring overload of the yaw system of a wind turbine generator set according to claim 1, characterized in that: Before determining the yaw operation based on the current wind speed, yaw angle, and grid connection status, the following steps are also included: Get the current wind speed and current yaw angle; Determine whether the current wind speed is greater than a preset wind speed threshold, the current yaw angle is greater than a preset yaw angle threshold, and the unit is in a grid-connected state; If so, it is determined that the current state is the first state; If not, the current state is indeed the second state.

3. The method for monitoring overload of the yaw system of a wind turbine generator set according to claim 2, characterized in that: If the current state is the first state, the yaw operation is determined according to the current wind speed, yaw angle, and grid connection state, including: At predetermined intervals, it is determined whether the current value of any yaw motor is greater than a predetermined warning value and the current uneven load coefficient is greater than a predetermined uneven load threshold; If so, the number of satisfactions is accumulated; When the number of times the condition is satisfied is greater than the first preset number within the first preset time, the wind turbine generator set is controlled to enter a load reduction operation state, and the yaw system is controlled to face the wind again after the load reduction is completed; Determine whether after load reduction, the current value of any yaw motor is greater than a preset warning value, and the current uneven load coefficient is greater than a preset uneven load threshold; If so, the wind turbine generator set is controlled to perform a protection shutdown and the yaw system is controlled to stop facing the wind.

4. The method for monitoring overload of the yaw system of a wind turbine generator set according to claim 3, characterized in that: When the number of times ... Stop the yaw system operation; After the second preset time has passed, the yaw system is controlled to start, and the step of collecting current values ​​of the current monitoring devices of the yaw system for monitoring the yaw motors of the yaw system is entered.

5. The method for monitoring overload of the yaw system of a wind turbine generator set according to claim 2, characterized in that: If the current state is the second state, the yaw operation is determined according to the current wind speed, yaw angle, and grid connection state, including: At predetermined intervals, it is determined whether the current value of any yaw motor is greater than a predetermined warning value and the current uneven load coefficient is greater than a predetermined uneven load threshold; If yes, the number of satisfied times is accumulated and the yaw system is stopped; After the second preset time, the yaw system is controlled to start, and the step of collecting the current value of each current monitoring device of the yaw system for monitoring each yaw motor is entered; When the number of times the condition is satisfied is greater than a first preset number within a first preset time, the wind turbine generator set is controlled to perform a protection shutdown and the yaw system is controlled to stop facing the wind.

6. The method for monitoring overload of the yaw system of a wind turbine generator set according to claim 4, characterized in that: Before the yaw system starts to face the wind, it also includes: Determine whether the power supply of the yaw system is abnormal, and whether there is a fault state of yaw too fast, yaw too slow, or high yaw pressure; If not, the process proceeds to the step of controlling the yaw system to start facing the wind.

7. A wind turbine yaw system overload monitoring device, characterized in that: include: The acquisition module is used to control the yaw system to start facing the wind and collect the current values ​​of various current monitoring devices used to monitor each yaw motor of the yaw system; A first calculation module is used to obtain the average current of each yaw motor according to the number of motors corresponding to each yaw motor and each current value; A second calculation module is used to obtain a current uneven load coefficient of the yaw system according to the average current of each yaw motor, the number of motors corresponding to each yaw motor, and the total number of yaw motors; A judgment module is used to judge whether the current value of any yaw motor is greater than a preset warning value and whether the current uneven load coefficient is greater than a preset uneven load threshold; if so, triggering the adjustment module; The adjustment module is used to determine the yaw operation according to the current wind speed, yaw angle, and grid connection status; The current uneven load coefficient is obtained by the first formula; The first formula is: ; Where U i Indicates the current uneven load coefficient, i=1, 2...n, n represents the total number of yaw motors, Represents the average current of the i-th yaw motor, N i represents the number of motors monitored by the current monitoring device of the i-th path, where I i Indicates the current value of the i-th yaw motor.

8. A wind turbine yaw system overload monitoring device, characterized in that: include: memory for storing computer programs; A processor is configured to implement the steps of the method for monitoring overload of a yaw system of a wind turbine generator set according to any one of claims 1 to 6 when executing the computer program.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for monitoring overload of a yaw system of a wind turbine generator set according to any one of claims 1 to 6 are implemented.

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