A wind turbine system with fault redundancy

Abstract

The application discloses a wind turbine fault redundancy system, and relates to the field of wind power, which comprises the following steps: when a sensor fails, it is determined whether the fault source is a basic device; if the fault source is a basic device, the functional relationship between the fault monitoring device and the normal monitoring device is determined; based on the functional relationship, the first working data of the fault monitoring device is determined, the wind turbine is evaluated according to the first working data, and the corresponding shutdown alarm signal is output according to the evaluation result; when the basic device fails, the fault type of the fault source is determined according to the response data and the control data; if it is a non-response fault, the safety of the wind turbine is evaluated according to the monitoring data before the fault; if it is a response result fault, the data stability of the monitoring data after the fault is judged, the second control interval is obtained, and the fault redundancy operation is carried out according to the second control interval. The application has the effect of improving the safety of the fault redundancy operation.

Description

Technical Field

[0001] This application relates to the field of wind power, and in particular to a fault redundancy system for wind turbine generator sets. Background Technology

[0002] As the global energy structure shifts towards cleaner energy, wind power, as one of the core renewable energy sources, has seen continuous growth in installed capacity. However, wind turbines operate in harsh environments (high humidity, temperature fluctuations, etc.) for extended periods, leading to frequent malfunctions.

[0003] In existing technologies for fault detection of wind turbine generators, a fault is identified when the detected data exceeds a set safety threshold, leading to a shutdown to alert staff for timely maintenance. However, some alarm signals do not affect the safety of the wind turbine. Shutting down the generator in such cases wastes wind power resources and reduces power generation. For example, the yaw servo, used to adjust the positional relationship between the blades and the wind direction, cannot adjust the yaw when it malfunctions, preventing the generator from facing the wind. Shutting down the generator while waiting for maintenance wastes wind resources during this period. Continuing to operate normally could further damage the generator. Therefore, a fault redundancy system for wind turbine generators is needed to ensure the safety of redundant operation and reduce power generation loss when partial faults occur. Summary of the Invention

[0004] To improve the safety of fault-redundant operation, this application provides a fault-redundant system for wind turbine generator sets.

[0005] This application provides a fault redundancy system for wind turbine generator sets, which adopts the following technical solution:

[0006] A fault redundancy system for wind turbine generator sets includes:

[0007] Step S1: Obtain the shutdown alarm signal of the fault alarm system in the wind turbine generator set, and classify the shutdown alarm signal according to the fault source in the shutdown alarm signal to obtain sensor faults and basic equipment faults.

[0008] Step S2: If the fault source of the shutdown alarm signal is a sensor fault, determine whether the equipment component monitored by the fault source is a basic device. If the equipment component monitored by the fault source is not a basic device, start fault redundancy operation.

[0009] Step S3: If the equipment component monitored by the fault source is a basic device, then mark the equipment component monitored by the fault source as a fault monitoring device, mark the remaining basic devices as normal monitoring devices, obtain the functional data of the fault monitoring device and the normal monitoring device, and determine the functional relationship between the fault monitoring device and the normal monitoring device based on the functional data of the fault monitoring device and the normal monitoring device.

[0010] Step S4: Based on the functional relationship between the fault monitoring equipment and the normal monitoring equipment, determine the first working data of the fault monitoring equipment, and conduct an operational safety assessment of the wind turbine generator set based on the first working data. When the assessment result indicates that the wind turbine generator set is not safe, output a shutdown alarm signal.

[0011] Step S5: If the fault source of the shutdown alarm signal is a basic equipment fault, then obtain the control data and response data before the fault source fails, match the response data with the control data, and determine the fault type of the fault source based on the matching relationship; the fault type includes response result fault and no response fault.

[0012] Step S6: If the fault type of the fault source is a non-response fault, then perform a safety assessment of the wind turbine generator set based on the monitoring data of the wind turbine generator set before the fault, and output a corresponding shutdown alarm signal based on the safety.

[0013] Step S7: If the fault type of the fault source is a response result fault, then the monitoring data of the wind turbine generator set after the fault is judged for data stability, and the second control range of the wind turbine generator set is determined according to the data stability after the fault. The wind turbine generator set is then adjusted according to the second control range to obtain the second adjustment data. When the second adjustment data exceeds the second controllable range, a shutdown alarm signal is output.

[0014] Preferably, the functional relationship includes functional conversion relationship and non-functional conversion relationship.

[0015] Prior to step S41, if there is a function conversion relationship between the fault monitoring device and the normal monitoring device, the monitoring data of the normal monitoring device with the function conversion relationship is read, and the read monitoring data is converted according to the function conversion relationship to obtain the theoretical monitoring data of the fault monitoring device.

[0016] Step S42: If the functional relationship between the fault monitoring device and the normal monitoring device is a non-functional conversion relationship, then obtain the wind speed data, wind energy conversion coefficient and electrical energy conversion coefficient of the wind turbine generator set, determine the theoretical electrical conversion amount that can be achieved under the corresponding wind speed data, and obtain the simulated conversion amount.

[0017] Step S43: Obtain the actual conversion amount and compare it with the simulated conversion amount to determine the working data of the fault monitoring device and obtain the first working data;

[0018] Step S44: Input the theoretical test data or first working data of the fault monitoring equipment and the normal monitoring data of the normal monitoring equipment into the fault alarm system to conduct an operational safety assessment of the wind turbine generator set, and output the corresponding shutdown alarm signal based on the assessment results.

[0019] Priority is given to obtaining the control data of the fault monitoring equipment under the conditions of wind speed data, wind energy conversion coefficient and electrical energy conversion coefficient of the corresponding wind turbine generator set, and using the control data as the first working data of the fault monitoring equipment.

[0020] If the actual conversion amount differs from the simulated conversion amount, the fault monitoring equipment is compensated based on the initial compensation data, and the actual power conversion amount after compensation is collected to obtain the initial compensation amount.

[0021] The difference between the initial compensation amount and the actual conversion amount before compensation is calculated to obtain the compensation difference. The difference between the initial compensation amount and the simulated conversion amount is calculated to obtain the remaining difference.

[0022] The remaining difference is calculated based on the compensation difference and the initial compensation data to obtain the compensation requirement data, and the fault monitoring equipment is compensated according to the compensation requirement data.

[0023] When the compensation demand data exceeds the control range of the fault monitoring equipment, a shutdown alarm signal is output.

[0024] Priority is to obtain monitoring data of the wind turbine generator set before the failure and to conduct a safety assessment based on the monitoring data;

[0025] If the assessment result of the wind turbine generator set before the fault is that it is safe, then the response data of the fault source before the fault is used as the fixed equipment parameter of the fault source, and the fixed equipment parameter of the fault source and the monitoring data of other normal equipment components of the non-fault source after the fault are input into the fault alarm system for fault alarm assessment, and the corresponding shutdown alarm signal is output according to the corresponding fault alarm assessment result.

[0026] In subsequent equipment adjustments, the operating data of other normal equipment components are adjusted based on the fixed equipment parameters of the fault source.

[0027] If the assessment of the wind turbine generator set before the failure indicates that it is not safe, a shutdown alarm signal will be output.

[0028] Firstly, in step S71, the working data of the wind turbine generator set during the shutdown process is collected to obtain shutdown conversion data, and the stability of the data change is judged on the shutdown conversion data.

[0029] Step S72: If the shutdown conversion data is stable, output a shutdown termination signal and use the shutdown conversion data as the second control range of the wind turbine generator set under fault conditions.

[0030] Step S73: Based on the second control range, monitor the various data of the wind turbine generator set that is subsequently operating, and determine whether the various data of the wind turbine generator set that is subsequently operating exceed the second control range.

[0031] Step S74: When any data item in the subsequent operation of the wind turbine generator exceeds the second control range, determine whether the data item exceeding the second control range can be adjusted back into the second control range based on the functional relationship between the various equipment components of the wind turbine generator.

[0032] Step S75: If it is determined that the data items exceeding the second control range can be adjusted to the second control range, then the data items exceeding the monitoring range are adjusted according to the difference between the corresponding data items and the second control range to obtain the second adjustment data.

[0033] Step S76: If it is determined that the data items outside the monitoring range cannot be adjusted back into the monitoring range, a shutdown alarm signal is output.

[0034] Prioritize obtaining the response time of each component of the wind turbine generator set if the shutdown conversion data is unstable, and determine the time data required for the wind turbine generator set to determine the existence of a fault risk based on the response time of each component, thus obtaining the response time data.

[0035] Obtain the braking coefficient of the braking system in the wind turbine generator set, and determine the maximum braking kinetic energy under the corresponding response time data based on the braking coefficient and response time data;

[0036] The kinetic energy conversion relationship in the wind turbine generator set is obtained, the maximum speed at which the wind turbine generator set reaches the maximum braking kinetic energy is determined, and the control data of the wind turbine generator set is determined based on the maximum speed and the real-time wind speed data, thus obtaining the third adjustment data;

[0037] When the third adjustment data of the wind turbine generator exceeds the control range of the corresponding equipment component, a shutdown alarm signal is output.

[0038] In summary, this application includes at least one of the following beneficial technical effects:

[0039] By classifying the shutdown alarm signals output by the wind turbine generator fault alarm system, a first classification of fault source types is performed, refining the handling methods for different types of fault sources. For sensor faults, equipment importance is assessed; for foundation equipment faults, equipment response behavior is assessed, resulting in a second classification of fault source types. This further refines the handling methods for different types of fault sources, making the judgment of fault redundancy operation more accurate for each type. For sensor faults in foundation equipment cases, by determining the functional relationship network between fault monitoring equipment and normal monitoring equipment, the working data of the fault monitoring equipment is reconstructed, ensuring the operational safety of the wind turbine generator in the event of sensor failure. For non-response faults in foundation equipment, by determining the operational safety of the wind turbine generator before the fault, the operational safety of the fault source is judged, thus ensuring the operational safety of the wind turbine generator in the event of equipment failure. For response result faults in foundation equipment, by determining the stability of the fault source operation after data response, the known nature of the fault source's working data is ensured, thus guaranteeing the operational safety of the wind turbine generator. This achieves degraded operation, reduces unnecessary downtime, and improves wind energy utilization.

[0040] By collecting and analyzing the operating data of the wind turbine generator during the shutdown process, the safety of the wind turbine generator during the shutdown process is determined. Then, based on the stability, the safe operating range of each equipment component is determined, and the operating data of each equipment component is monitored and adjusted according to the safe operating range. This ensures the safety of the wind turbine generator during fault redundancy operation and improves the conversion rate of wind energy.

[0041] By analyzing the response time of each component of the wind turbine generator set, the time required for the wind turbine generator set to take action from the detection of a fault is determined. By using this response time data as braking time data, the maximum operating range of each component of the wind turbine generator set is determined, thereby ensuring that the generator set can be shut down in time when a fault is detected, avoiding further damage and ensuring the safety of the wind turbine generator set's fault redundancy operation. Attached Figure Description

[0042] Figure 1 This is a flowchart of the steps of the wind turbine generator set fault redundancy system in this embodiment. Detailed Implementation

[0043] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0044] This application discloses a fault redundancy system for wind turbine generator sets.

[0045] Example: Figure 1As shown, the present invention provides a fault redundancy system for wind turbine generator sets, comprising:

[0046] S1: Acquire the shutdown alarm signal from the fault alarm system in the wind turbine generator set, and classify the shutdown alarm signal according to the fault source in the shutdown alarm signal to obtain sensor faults and basic equipment faults. When the alarm source output by the fault alarm system built into the wind turbine generator set is a sensor fault, it indicates that the sensor is not working properly, that is, the data collected by the sensor cannot accurately reflect the working status of the corresponding monitoring equipment. When the alarm source output by the fault alarm system built into the wind turbine generator set is a basic equipment fault, it indicates that there is a fault in the power generation system of the wind turbine generator set, that is, it cannot convert wind energy into electrical energy as expected, but the working data of the equipment components monitored by the sensor is accurate. The fault alarm system can be a multi-source data fusion diagnostic system as described in existing technology.

[0047] S2, if the fault source of the shutdown alarm signal is a sensor fault, then determine whether the equipment component monitored by the fault source is basic equipment. If the equipment component monitored by the fault source is not basic equipment, then initiate fault redundancy operation. Basic components include fan blades, yaw motors, wind vanes, braking systems, conversion systems, etc. Since a complete wind turbine generator set includes not only basic equipment for wind energy conversion, but also monitoring equipment for various monitoring purposes, as well as auxiliary equipment such as wiring and casing, etc. When it is determined that the equipment component monitored by the faulty sensor is not basic equipment, it indicates that the data collected by the sensor corresponding to the basic equipment is accurate. Since accurate data does not trigger an alarm through the fault alarm system, it indicates that the basic equipment is operating normally and can convert wind energy into electrical energy normally. Therefore, fault redundancy operation can be implemented for this fault. This fault redundancy operation refers to outputting alarm maintenance signals to remind relevant personnel to perform equipment maintenance, but without shutting down the unit.

[0048] S3. If the equipment component monitored by the fault source is basic equipment, then the monitored equipment component is marked as a fault monitoring device, and the remaining basic equipment is marked as normal monitoring devices. Functional data of both the fault monitoring device and the normal monitoring device are acquired, and the functional relationship between them is determined based on this data. This functional relationship includes functional conversion relationships and non-functional conversion relationships. A functional conversion relationship refers to a situation where a change in the data of one equipment component leads to a related change in the data of another equipment component; in this case, a functional conversion relationship exists between the two components. For example, the coupling relationship between pitch angle and generator speed. When the equipment component monitored by the sensor is basic equipment, it indicates that the collected operating data of the basic equipment is inaccurate. Therefore, when judging basic equipment faults based on the fault alarm system, the judgment result is inaccurate. Thus, it is necessary to utilize the data conversion relationships between basic equipment to verify the data of the faulty basic equipment to ensure data accuracy to the greatest extent possible. This ensures that the wind turbine generator can operate without shutdown during alarm maintenance, improving wind energy utilization.

[0049] S4, based on the functional relationship between the fault monitoring equipment and the normal monitoring equipment, determines the first working data of the fault monitoring equipment, and performs an operational safety assessment of the wind turbine generator set based on the first working data. When the assessment result indicates that the wind turbine generator set is not safe, a shutdown alarm signal is output.

[0050] S5, if the fault source of the shutdown alarm signal is a basic equipment fault, then obtain the control data and response data before the fault source fails, match the response data with the control data, and determine the fault type of the fault source based on the matching relationship; the fault type includes response result fault and no response fault.

[0051] S6. If the fault type of the fault source is a non-response fault, then the safety assessment of the wind turbine generator set is carried out based on the monitoring data of the wind turbine generator set before the fault, and the corresponding shutdown alarm signal is output according to the safety.

[0052] S7. If the fault type of the fault source is a response result fault, then the monitoring data of the wind turbine generator set after the fault is judged for data stability, and the second control range of the wind turbine generator set is determined according to the data stability after the fault. The wind turbine generator set is then adjusted according to the second control range to obtain the second adjustment data. When the second adjustment data exceeds the second controllable range, a shutdown alarm signal is output.

[0053] In this embodiment, the shutdown alarm signals output by the wind turbine generator fault alarm system are classified into sensor faults and basic equipment faults. This allows for different judgment paths to be adopted for different types of faults, improving the accuracy of the judgment results. For sensor faults, the importance of the equipment is assessed to determine whether the fault source involves basic equipment. If it is not basic equipment, conventional redundant operation is directly initiated. If it is basic equipment, the functional relationship network between the fault monitoring equipment and the normal monitoring equipment is determined, and the working data of the faulty equipment is reconstructed to determine the safety of the wind turbine generator in the event of sensor failure. For basic equipment faults, the fault source is further divided into non-response faults and response result faults based on the equipment's response behavior. If it is a non-response fault, the safety of the faulty equipment is determined by conducting a safety assessment of the wind turbine generator before the fault, thereby ensuring the safety of the wind turbine generator in the event of equipment failure. If it is a response result fault, the stability of the faulty equipment after the response is determined, thereby fixing the parameter values ​​of the faulty equipment and ensuring the safe operation of the wind turbine generator. This achieves degraded operation, reduces unnecessary downtime, and improves equipment availability.

[0054] By classifying the shutdown alarm signals output by the wind turbine generator fault alarm system, a first classification of fault source types is performed, refining the handling methods for different types of fault sources. A second classification is performed for sensor faults, assessing equipment importance, and for foundation equipment faults, judging equipment response behavior, further refining the handling methods for different types of fault sources. This makes the judgment of fault redundancy operation for each type of fault source more accurate. For sensor faults in the case of foundation equipment, by determining the functional relationship network between fault monitoring equipment and normal monitoring equipment, the working data of the fault monitoring equipment is reconstructed, ensuring the operational safety of the wind turbine generator in the event of sensor failure. For non-response faults in foundation equipment, by determining the operational safety of the wind turbine generator before the fault, the operational safety of the fault source is judged, thus ensuring the operational safety of the wind turbine generator in the event of equipment failure. For response result faults in foundation equipment, by determining the stability of the fault source operation after data response, the known nature of the fault source's working data is ensured, thus guaranteeing the operational safety of the wind turbine generator. This achieves degraded operation, reduces unnecessary downtime, and improves wind energy utilization.

[0055] For example, when the fault alarm system outputs a shutdown alarm signal, the wind turbine will shut down and wait until maintenance is completed and the turbine is restarted. During this waiting period, wind energy is wasted, and power conversion efficiency is reduced. Therefore, by re-evaluating the shutdown alarm signal output by the fault alarm system, it can be determined whether the wind turbine can continue operating under this fault condition. This continued operation can be normal operation or low-speed operation, ensuring that the conversion rate of the wind turbine is not zero during the waiting period.

[0056] Meanwhile, existing wind turbine generator fault alarm systems monitor not only the basic power generation equipment but also additional functions, such as the sensors themselves, when performing fault monitoring. Therefore, by judging the fault source of the shutdown alarm signal output by the fault alarm system, it can be determined whether the fault source is a sensor fault or a basic equipment (basic power generation equipment) fault.

[0057] When a sensor malfunction is identified, it indicates that the data collected by the malfunctioning sensor is inaccurate. However, it is unknown whether the equipment monitored by the sensor is also malfunctioning. Therefore, further judgment is needed. By determining whether the equipment monitored by the malfunctioning sensor is the basic power generation equipment, if it is not, it means that the operating data of the basic power generation equipment can be correctly collected by normal sensors. At the same time, since the fault alarm system does not process the correct operating data of the basic power generation equipment, it indicates that the basic power generation equipment is normal and can perform fault redundancy operation.

[0058] When the faulty sensor is monitoring a power generation system, it indicates that the operational data of a certain device within the power generation system is not being collected correctly. Therefore, it's necessary to utilize the functional data conversion relationships between different power generation systems to determine the functional data conversion relationships between the faulty sensor and other devices. Then, using the correct data from other devices, the operational data of the faulty sensor can be deduced in reverse, thus clarifying the operational data of the faulty device and allowing for an assessment of whether the faulty device can function properly. If adjustment is deemed necessary, it can be performed normally, and the functional relationships can be used for data feedback to verify the change.

[0059] For example, if the yaw motor sensor malfunctions and cannot determine the yaw angle, while the wind vane sensor is functioning normally, when the wind vane sensor detects a change in wind direction, the control system processes the data and adjusts the yaw motor to the same angle. When the control system outputs control data, and the yaw motor executes the control data, theoretically, the wind vane sensor will detect the same wind direction as the wind turbine. Therefore, when the wind direction reflected by the wind vane matches the wind turbine, it indicates that the yaw motor is working normally, and that the current operating data of the yaw motor corresponds to the control data. Thus, even if the yaw motor sensor malfunctions, the operating data of the yaw motor can still be determined. Therefore, when it is determined that the yaw motor is working normally, if the wind direction changes again, the control system will adjust accordingly and use the wind vane to provide feedback on the adjustment results. Only when the data value adjusted by the control system exceeds the control range of the corresponding equipment will a shutdown alarm signal be output.

[0060] When the fault is determined to be a basic equipment failure, there are two possible outcomes. The first is that the control system controls the basic equipment, the basic equipment receives the control data and runs, but the running result does not meet the requirements, i.e., a response result failure. The second is that the control system controls the basic equipment, but the basic equipment does not run after receiving the control data, resulting in the running result not meeting the requirements, i.e., a non-response failure.

[0061] For the first scenario: response result failure, for example, the faulty basic equipment is the yaw motor. When the yaw motor is running but the wind turbine generator does not yaw, there may be a problem with the meshing between the gears. In this case, the state of the yaw motor is unstable. Therefore, it is necessary to collect the working data of the yaw motor through sensors at all times to determine whether the working data is stable. When the working data remains unchanged and is in a stable state, fault redundancy operation can be performed so that the yaw motor achieves the effect of fixed failure, that is, the parameters of the yaw motor always remain unchanged.

[0062] For the second scenario: no response to faults. For example, if the faulty basic equipment is the yaw motor, when the yaw motor is not running, the direction of the wind turbine controlled by the yaw motor remains unchanged, that is, the operating data remains unchanged. Therefore, when analyzing the wind turbine, it is only necessary to determine whether the operating state of the wind turbine is safe when the yaw motor operating data remains unchanged. If the operating state of the wind turbine is safe, fault redundancy operation can be performed. Conversely, if the operating state of the wind turbine is unsafe, a shutdown alarm signal should be output.

[0063] In step S4, based on the functional relationship between the fault monitoring equipment and the normal monitoring equipment, the first working data of the fault monitoring equipment is determined, and the operational safety of the wind turbine generator is assessed based on the first working data. When the assessment result indicates that the wind turbine generator is not safe, a shutdown alarm signal is output, including the following steps:

[0064] S41, If ​​there is a function conversion relationship between the fault monitoring device and the normal monitoring device, the monitoring data of the normal monitoring device with the function conversion relationship is read, and the read monitoring data is converted according to the function conversion relationship to obtain the theoretical monitoring data of the fault monitoring device.

[0065] S42, If the functional relationship between the fault monitoring equipment and the normal monitoring equipment is a non-functional conversion relationship, then obtain the wind speed data, wind energy conversion coefficient and electrical energy conversion coefficient of the wind turbine generator set, determine the theoretically achievable electrical energy conversion under the corresponding wind speed data, and obtain the simulated conversion amount;

[0066] S43, obtain the actual conversion amount, compare the actual conversion amount with the simulated conversion amount, determine the working data of the fault monitoring equipment, and obtain the first working data;

[0067] S44 inputs the theoretical test data or first working data of the fault monitoring equipment and the normal monitoring data of the normal monitoring equipment into the fault alarm system to conduct an operational safety assessment of the wind turbine generator set, and outputs the corresponding shutdown alarm signal based on the assessment results.

[0068] In this embodiment, by determining the functional relationship between fault monitoring equipment and normal monitoring equipment, for fault monitoring equipment with functional relationship, the theoretical monitoring data of the fault monitoring equipment is determined based on the functional conversion relationship and the monitoring data of the corresponding normal monitoring equipment. For fault monitoring equipment without functional conversion relationship, the theoretical conversion amount of the corresponding wind speed data is determined by utilizing the control mechanism of the wind turbine generator set. By comparing the theoretical conversion amount with the actual conversion amount, the working data of the fault monitoring equipment is determined. Then, the safety assessment of the operating status of the wind turbine generator set is carried out based on the assessed theoretical monitoring data or working data, thereby ensuring the operating safety of the wind turbine generator set in the event of sensor failure.

[0069] For example, assuming the fault monitoring device is the pitch control motor in the pitch system, when matching the function conversion relationship between the fault monitoring device and the normal monitoring device, there is a coupling relationship between the pitch angle and the generator speed. Assuming that when the wind speed is M, the coupling relationship between the pitch angle and the generator speed conforms to y=ax, where y is the generator speed, a is the coupling coefficient, and x is the pitch angle. Since the generator speed sensor is functioning normally, the generator speed data can be directly obtained. Therefore, through the coupling relationship, the pitch angle value of the fan blades can be effectively determined. This calculated pitch angle value is used as the correct value collected by the fault sensor and input into the fault alarm system to evaluate the operating status of the wind turbine generator set. If the evaluation result indicates a fault, a shutdown alarm signal is output, and the unit is shut down for waiting. If the evaluation result indicates no fault, an alarm maintenance signal is output, thereby notifying relevant personnel of maintenance.

[0070] If there is no functional conversion relationship between the fault monitoring equipment and the normal monitoring equipment, the control principle of the wind turbine's own control system is utilized. Assuming that all equipment components in the wind turbine are in normal working condition, the working data of each equipment component is in optimal condition after control by the control system. The wind energy conversion coefficient and the kinetic energy conversion efficiency of the wind turbine are known. Assuming that the wind energy conversion coefficient of the wind turbine is k, the kinetic energy generated under the wind energy conversion coefficient k can be obtained when the wind speed is known. Then, according to the electrical energy conversion coefficient p, the amount of electrical energy converted from kinetic energy is determined. By comparing the actual converted electrical energy with the simulated converted electrical energy, it is determined whether the working state of the fault monitoring equipment is executed according to the control system's control result. Thus, using the simulated conversion amount as a reference and the actual conversion amount as a comparison value, the working data of the fault monitoring equipment is determined. Based on the working data of the fault monitoring equipment, the operational safety of the wind turbine is evaluated, ensuring the safety of the wind turbine's fault redundancy operation.

[0071] In step S43, the actual conversion rate is obtained, and the actual conversion rate is compared with the simulated conversion rate to determine the working data of the fault monitoring device and obtain the first working data, including the following steps:

[0072] S431, if the actual conversion amount is the same as the simulated conversion amount, then obtain the control data of the fault monitoring equipment under the wind speed data, wind energy conversion coefficient and electrical energy conversion coefficient of the corresponding wind turbine generator set, and use the control data as the first working data of the fault monitoring equipment.

[0073] S432, if the actual conversion amount is different from the simulated conversion amount, the fault monitoring equipment is compensated based on the initial compensation data, and the actual power conversion amount after compensation is collected to obtain the initial compensation amount; the initial compensation data of different fault monitoring equipment is different.

[0074] S433, calculate the difference between the initial compensation amount and the actual conversion amount before compensation to obtain the compensation difference, and calculate the difference between the initial compensation amount and the simulated conversion amount to obtain the remaining difference;

[0075] S434: Calculate the remaining difference based on the compensation difference and the initial compensation data to obtain the compensation requirement data, and then compensate the fault monitoring equipment based on the compensation requirement data.

[0076] S435 outputs a shutdown alarm signal when the compensation demand data exceeds the control range of the fault monitoring equipment.

[0077] In this embodiment, the working data of the fault monitoring device is determined by comparing the actual conversion amount with the simulated conversion amount. When the actual conversion amount is equal to the simulated conversion amount, the corresponding control data in the control scheme is used as the first working data of the fault monitoring device. When the actual conversion amount is different from the simulated conversion amount, the fault monitoring device is compensated for the first time using the initial compensation data, thereby clarifying the data relationship between the compensation data and the actual conversion amount. Then, the compensation requirement data required to reach the simulated conversion amount is calculated based on the remaining conversion amount difference. By judging the control range of the compensation requirement data, the accuracy of the control result is further determined, thus improving the accuracy of the safety assessment of the wind turbine generator based on the first working data of the fault monitoring device obtained from the judgment.

[0078] For example, when comparing the actual conversion amount with the simulated conversion amount, there may be cases where the actual conversion amount is equal to or unequal to the simulated conversion amount. When the actual conversion amount is the same as the simulated conversion amount, it indicates that the fault monitoring device has made accurate adjustments according to the adjustment data under the corresponding adjustment scheme. Therefore, the adjustment data can be directly used as the actual working data of the fault monitoring device, so as to achieve the purpose of accurately knowing the working data of the fault monitoring device even when the sensor fails.

[0079] When the actual conversion rate differs from the simulated conversion rate, it indicates that the fault monitoring equipment is not operating according to the control data, making it impossible to directly obtain the equipment's operational data. By utilizing the built-in initial compensation data to perform initial compensation on the fault monitoring equipment, the changes in data after initial compensation are determined, thus establishing the relationship between the initial compensation data and the actual conversion rate after compensation. Combined with the data difference between the initial compensation and the simulated conversion rate, the required compensation data (compensation demand data) for the actual conversion rate to the simulated conversion rate is identified. When the compensation result shows that the actual conversion rate equals the simulated conversion rate, it indicates that the current operational data of the fault monitoring equipment is equal to the control data under the corresponding control scheme. Furthermore, by judging the control range of the compensation demand data, it is confirmed that the compensation demand data can be adjusted normally, ensuring its feasibility and improving the accuracy of the judgment.

[0080] In step S6, if the fault type of the fault source is a non-response fault, a safety assessment of the wind turbine generator set is performed based on the monitoring data of the wind turbine generator set before the fault, and a corresponding shutdown alarm signal is output according to the safety assessment, including the following steps:

[0081] S61, acquire monitoring data of the wind turbine generator set before the failure, and conduct a safety assessment based on the monitoring data;

[0082] S62, if the assessment result of the wind turbine generator set before the fault is that it is safe, then the response data of the fault source before the fault is used as the fixed equipment parameter of the fault source, and the fixed equipment parameter of the fault source and the monitoring data of other normal equipment components of the non-fault source after the fault are input into the fault alarm system for fault alarm assessment, and the corresponding shutdown alarm signal is output according to the corresponding fault alarm assessment result.

[0083] S63, in subsequent equipment control, the working data of other normal equipment components are controlled based on the fixed equipment parameters of the fault source;

[0084] S64 If the assessment result of the wind turbine generator set before the fault is that it is not safe, then output a shutdown alarm signal.

[0085] In this embodiment, the reliability of the response data of the fault source before the failure is determined by assessing the operational safety of the wind turbine generator set before the failure. When the response data of the fault source before the failure is determined to be reliable, the response data of the fault source before the failure is used as the equipment parameters of the fault source under the current situation to assess the operational safety of the wind turbine generator set under the current situation. This ensures the safety of the wind turbine generator set's fault redundancy operation under the current situation. At the same time, in subsequent equipment control, the fixed equipment parameters of the fault source are used as a benchmark to control the working data of other normal equipment components, making the operational safety of the wind turbine generator set after control higher and maximizing the conversion rate of wind energy.

[0086] For example, when the fault type of the fault source is a non-responsive fault of the basic equipment, it indicates that the fault source did not respond to external signals before the fault was determined. Therefore, after the last adjustment, the adjustment data of the fault source remains unchanged. Then, by assessing the safety of the wind turbine generator set before the fault, if the assessment result of the wind turbine generator set before the fault is safe, it indicates that the adjustment data of the fault source before the fault is available. Therefore, the response data of the fault source before the fault can be used as the fixed equipment parameter of the fault source. By comparing the current working data (monitoring data) monitored by other equipment with the fixed equipment parameter of the fault source, the operational safety of the wind turbine generator set is assessed, and the operational safety of the wind turbine generator set is determined, ensuring the safety of the fault redundancy operation of the wind turbine generator set. At the same time, when performing subsequent adjustments, the fixed equipment parameter of the fault source is used as the main reference to adjust the working data of other normal equipment, thereby ensuring the operational safety of the wind turbine generator set.

[0087] In step S7, if the fault type of the fault source is a response result fault, the monitoring data of the wind turbine generator set after the fault is assessed for data stability, and the second control range of the wind turbine generator set is determined based on the data stability after the fault. The wind turbine generator set is then adjusted according to the second control range to obtain the second adjustment data. When the second adjustment data exceeds the second controllable range, a shutdown alarm signal is output, including the following steps:

[0088] S71 collects the operating data of the wind turbine generator set during the shutdown process to obtain shutdown conversion data, and judges the stability of data changes in the shutdown conversion data; whereby the shutdown process refers to the continuous process of the wind turbine generator set from the operating state to the stopped state.

[0089] S72, if the shutdown conversion data is stable, output a shutdown termination signal and use the shutdown conversion data as the second control range of the wind turbine generator set under fault conditions;

[0090] S73, based on the second control range, monitor various data of the wind turbine generator set that is subsequently in operation, and determine whether the various data of the wind turbine generator set that is subsequently in operation exceed the second control range;

[0091] S74, when any data item in the subsequent operation of the wind turbine generator exceeds the second control range, determine whether the data item exceeding the second control range can be adjusted to the second control range based on the functional relationship between the various equipment components of the wind turbine generator.

[0092] S75, if it is determined that the data items exceeding the second control range can be adjusted to the second control range, then the data items exceeding the monitoring range are adjusted according to the difference between the corresponding data items and the second control range to obtain the second adjustment data;

[0093] S77 If it is determined that the data items outside the monitoring range cannot be adjusted back into the monitoring range, a shutdown alarm signal is output.

[0094] In this embodiment, by collecting and analyzing the operating data of the wind turbine generator set during the shutdown process, the safety of the wind turbine generator set during the shutdown process is determined. Then, based on the stability, the safe operating range of each equipment component is determined, and the operating data of each equipment component is monitored and adjusted according to the safe operating range. This ensures the safety of the wind turbine generator set during fault redundancy operation and improves the conversion rate of wind energy.

[0095] For example, when the fault source is a failure of the response result of the basic equipment, such as a stuck gear, the fault source is adjustable but not accurately adjustable. Therefore, when the environment changes, it may cause untimely or disordered response. For example, the requirement is to reduce the speed, but the result of the adjustment is to increase the speed, which will cause further damage to the wind turbine. Therefore, it is necessary to determine the effective control range of the fault source in this case to ensure that the wind turbine can operate safely in this case.

[0096] By collecting and analyzing the operating data of various equipment components of the wind turbine generator during shutdown, the safety of the wind turbine generator under different speeds, blade angles, yaw angles, braking coefficients, etc., during shutdown is determined. If the safety is guaranteed, it means that the operating data of each equipment component in the wind turbine generator can ensure the safe operation of the wind turbine generator within the data range involved in the shutdown process. Therefore, by using the shutdown conversion data as the safe operating range of each equipment component in the wind turbine generator, the safety of the wind turbine generator is guaranteed during fault redundancy operation, thereby improving the conversion rate of wind energy.

[0097] In step S71, the operating data of the wind turbine generator set during the shutdown process is collected to obtain shutdown conversion data. The stability of the shutdown conversion data is then assessed, including the following steps:

[0098] S711, if the shutdown conversion data is not stable, then obtain the response time of each equipment component of the wind turbine generator set, and determine the time data required for the wind turbine generator set to determine the existence of a fault risk based on the response time of each equipment component, and obtain the response time data.

[0099] S712, obtain the braking coefficient of the braking system in the wind turbine generator set, and determine the maximum braking kinetic energy under the corresponding response time data based on the braking coefficient and response time data;

[0100] S713: Obtain the kinetic energy conversion relationship in the wind turbine generator set, determine the maximum speed when the wind turbine generator set reaches the maximum braking kinetic energy, and determine the control data of the wind turbine generator set based on the maximum speed and the real-time collected wind speed data to obtain the third control data.

[0101] S714 outputs a shutdown alarm signal when the third adjustment data of the wind turbine generator exceeds the control range of the corresponding equipment component.

[0102] In this embodiment, when the shutdown conversion data is determined to be unstable, the response time of each component of the wind turbine generator set is analyzed to determine the time required for the wind turbine generator set to take action from the determination of a fault. By using this response time data as braking time data, the maximum operating range (third adjustment data) of each component of the wind turbine generator set is determined, thereby ensuring that the wind turbine generator set can be shut down in a timely manner when a fault is determined, avoiding further expansion of losses and ensuring the safety of the wind turbine generator set's fault redundancy operation.

[0103] For example, when it is determined that the shutdown conversion data is not stable, it means that the operating data of each equipment component during the shutdown process cannot be used as the safe operating range of each equipment component of the wind turbine generator set. Therefore, by judging the response time of each equipment component of the wind turbine generator set, the data response delay of each equipment component is determined. Then, based on the response time data, the maximum operating data of the wind turbine generator set is determined, and the operating range of each equipment component of the wind turbine generator set is clarified. This allows the wind turbine generator set to stop in time when a sudden change occurs, resulting in unstable operation, so as to ensure the safety of the wind turbine generator set itself and reduce the further expansion of damage.

[0104] Compared to existing wind turbine generator fault redundancy systems, this invention improves the safety of fault redundancy operation.

[0105] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fault redundancy system for wind turbine generator sets, characterized in that, include: Step S1: Obtain the shutdown alarm signal of the fault alarm system in the wind turbine generator set, and classify the shutdown alarm signal according to the fault source in the shutdown alarm signal to obtain sensor faults and basic equipment faults. Step S2: If the fault source of the shutdown alarm signal is a sensor fault, determine whether the equipment component monitored by the fault source is a basic equipment. If the equipment component monitored by the fault source is not a basic equipment, start fault redundancy operation. The basic equipment refers to the equipment used for wind energy conversion. Step S3: If the equipment component monitored by the fault source is a basic device, then mark the equipment component monitored by the fault source as a fault monitoring device, mark the remaining basic devices as normal monitoring devices, obtain the functional data of the fault monitoring device and the normal monitoring device, and determine the functional relationship between the fault monitoring device and the normal monitoring device based on the functional data of the fault monitoring device and the normal monitoring device. The functional relationships include functional transformation relationships and non-functional transformation relationships; Step S4: Based on the functional relationship between the fault monitoring equipment and the normal monitoring equipment, determine the first working data of the fault monitoring equipment, and conduct an operational safety assessment of the wind turbine generator set based on the first working data. When the assessment result indicates that the wind turbine generator set is not safe, output a shutdown alarm signal. Step S5: If the fault source of the shutdown alarm signal is a basic equipment fault, then obtain the control data and response data before the fault source fails, match the response data with the control data, and determine the fault type of the fault source based on the matching relationship. The fault types include response result faults and no-response faults; the response result fault refers to the control system regulating the basic equipment, the basic equipment receiving and running the control data, but the running result does not meet the requirements. The non-response fault refers to the situation where the control system controls the basic equipment, but the basic equipment does not operate after receiving the control data, resulting in the operating result not meeting the requirements. Step S6: If the fault type of the fault source is a non-response fault, then the safety assessment of the wind turbine generator set is carried out based on the monitoring data of the wind turbine generator set before the fault. If the working state of the wind turbine generator set is safe, then the fault redundancy operation is performed. Otherwise, if the working state of the wind turbine generator set is unsafe, then the shutdown alarm signal is output. Step S7: If the fault type of the fault source is a response result fault, then the monitoring data of the wind turbine generator set after the fault is judged for data stability, and the second control range of the wind turbine generator set is determined according to the data stability after the fault. The wind turbine generator set is adjusted according to the second control range to obtain the second control data. When the second control data exceeds the second controllable range, a shutdown alarm signal is output. Step S71: Collect the working data of the wind turbine generator set during the shutdown process to obtain shutdown conversion data, and judge the stability of the data change of the shutdown conversion data. Step S72: If the shutdown conversion data is stable, output a shutdown termination signal and use the shutdown conversion data as the second control range of the wind turbine generator set under fault conditions. Step S73: Based on the second control range, monitor the various data of the wind turbine generator set that is subsequently operating, and determine whether the various data of the wind turbine generator set that is subsequently operating exceed the second control range. Step S74: When any data item in the subsequent operation of the wind turbine generator exceeds the second control range, determine whether the data item exceeding the second control range can be adjusted back into the second control range based on the functional relationship between the various equipment components of the wind turbine generator. Step S75: If it is determined that the data items exceeding the second control range can be adjusted to the second control range, then the data items exceeding the monitoring range are adjusted according to the difference between the corresponding data items and the second control range to obtain the second adjustment data. Step S76: If it is determined that the data items outside the monitoring range cannot be adjusted back into the monitoring range, a shutdown alarm signal is output.

2. The wind turbine generator set fault redundancy system according to claim 1, characterized in that: Step S4 includes: Step S41: If there is a function conversion relationship between the fault monitoring device and the normal monitoring device, the monitoring data of the normal monitoring device with the function conversion relationship is read, and the read monitoring data is converted according to the function conversion relationship to obtain the theoretical monitoring data of the fault monitoring device. Step S42: If the functional relationship between the fault monitoring device and the normal monitoring device is a non-functional conversion relationship, then obtain the wind speed data, wind energy conversion coefficient and electrical energy conversion coefficient of the wind turbine generator set, determine the theoretical electrical conversion amount that can be achieved under the corresponding wind speed data, and obtain the simulated conversion amount. Step S43: Obtain the actual conversion amount and compare it with the simulated conversion amount to determine the working data of the fault monitoring device and obtain the first working data; Step S44: Input the theoretical test data or first working data of the fault monitoring equipment and the normal monitoring data of the normal monitoring equipment into the fault alarm system to conduct an operational safety assessment of the wind turbine generator set, and output the corresponding shutdown alarm signal based on the assessment results.

3. The wind turbine generator set fault redundancy system according to claim 2, characterized in that: Step S43 includes: If the actual conversion amount is the same as the simulated conversion amount, the control data of the fault monitoring equipment under the corresponding wind speed data, wind energy conversion coefficient and electrical energy conversion coefficient of the wind turbine generator set will be obtained, and the control data will be used as the first working data of the fault monitoring equipment. If the actual conversion amount differs from the simulated conversion amount, the fault monitoring equipment is compensated based on the initial compensation data, and the actual power conversion amount after compensation is collected to obtain the initial compensation amount. The difference between the initial compensation amount and the actual conversion amount before compensation is calculated to obtain the compensation difference. The difference between the initial compensation amount and the simulated conversion amount is calculated to obtain the remaining difference. The remaining difference is calculated based on the compensation difference and the initial compensation data to obtain the compensation requirement data, and the fault monitoring equipment is compensated according to the compensation requirement data. When the compensation demand data exceeds the control range of the fault monitoring equipment, a shutdown alarm signal is output.

4. A wind turbine generator set fault redundancy system according to claim 1, characterized in that: Step S6 includes: Obtain monitoring data of the wind turbine generator set before the failure, and conduct a safety assessment based on the monitoring data; If the assessment result of the wind turbine generator set before the fault is that it is safe, then the response data of the fault source before the fault is used as the fixed equipment parameter of the fault source, and the fixed equipment parameter of the fault source and the monitoring data of other normal equipment components of the non-fault source after the fault are input into the fault alarm system for fault alarm assessment, and the corresponding shutdown alarm signal is output according to the corresponding fault alarm assessment result. In subsequent equipment adjustments, the operating data of other normal equipment components are adjusted based on the fixed equipment parameters of the fault source. If the assessment of the wind turbine generator set before the failure indicates that it is not safe, a shutdown alarm signal will be output.

5. A wind turbine generator fault redundancy system according to claim 1, characterized in that: Step S71 also includes: If the shutdown conversion data is not stable, the response time of each equipment component of the wind turbine generator set is obtained, and the time data required for the wind turbine generator set to determine the existence of a fault risk is determined based on the response time of each equipment component, thus obtaining the response time data; the response time data refers to the time required for the wind turbine generator set to take action from the determination of a fault. Obtain the braking coefficient of the braking system in the wind turbine generator set, and determine the maximum braking kinetic energy under the corresponding response time data based on the braking coefficient and response time data; The kinetic energy conversion relationship in the wind turbine generator set is obtained, the maximum speed at which the wind turbine generator set reaches the maximum braking kinetic energy is determined, and the control data of the wind turbine generator set is determined based on the maximum speed and the real-time wind speed data, thus obtaining the third adjustment data; When the third adjustment data of the wind turbine generator exceeds the control range of the corresponding equipment component, a shutdown alarm signal is output.

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