Fan fault diagnosis system and air conditioning equipment

Abstract

The application discloses a fan fault diagnosis system and air conditioning equipment, the fan fault diagnosis system comprises a fluctuation amplitude acquisition module, a rotating speed acquisition module and a judging module; the fluctuation amplitude acquisition module is used to acquire the current fluctuation amplitude of the fan; the rotating speed acquisition module is used to acquire the rotating speed of the fan; the judging module is used to judge whether the current fluctuation amplitude reaches the set fluctuation threshold value; if the current fluctuation amplitude reaches the set fluctuation threshold value, the current effective fluctuation is determined; if the frequency of the current effective fluctuation is in a multiple relationship with the rotating speed of the fan, the fan blade or the volute is determined to be faulty. Therefore, the fan fault diagnosis system and the air conditioning equipment accurately determine the fan blade or the volute to be faulty through the current fluctuation amplitude, the frequency of the current effective fluctuation and the rotating speed of the fan, and solve the technical problem that the fan fault positioning is not easy in the prior art.

Description

Technical Field

[0001] This invention relates to the field of fault diagnosis technology, and in particular to a fan fault diagnosis system and air conditioning equipment. Background Technology

[0002] As living standards improve, the usage rate of air conditioners is increasing year by year, and the requirements for air conditioner quality are also getting higher and higher. The requirements for rapid fault location after a malfunction is also becoming increasingly stringent.

[0003] The outdoor fan is an important component of an air conditioner, and whether the outdoor fan can operate normally directly affects the operation of the entire air conditioner.

[0004] The key to outdoor fans is ensuring sufficient airflow and preventing the entire air conditioning unit from reporting fan malfunctions. Because outdoor fans operate in a complex environment with variable operating conditions, their reliability is paramount.

[0005] However, since outdoor fans operate outdoors, it is not easy to locate faults when abnormal conditions occur during operation. Summary of the Invention

[0006] This invention proposes a wind turbine fault diagnosis system, which solves the technical problem of difficulty in locating wind turbine faults in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This invention provides a wind turbine fault diagnosis system, comprising:

[0009] The fluctuation amplitude acquisition module is configured to acquire the current fluctuation amplitude of the fan.

[0010] The speed acquisition module is configured to acquire the speed of the fan.

[0011] The judgment module is configured to: receive the current fluctuation amplitude sent by the fluctuation amplitude acquisition module; if the current fluctuation amplitude reaches the set fluctuation threshold, it is determined to be a valid current fluctuation; if the frequency of the valid current fluctuation is a multiple of the fan speed, it is determined that the fan blades or volute have failed.

[0012] In some embodiments of this application, the determination module is further configured as follows:

[0013] After determining that the fan blades or volute are faulty, reduce the upper limit of the fan speed.

[0014] In some embodiments of this application, the determination module is further configured as follows:

[0015] Calculate the deviation between the amplitude of any phase current and the reference value;

[0016] Determine if there is a deviation that is outside the set deviation range;

[0017] If there is a deviation that is outside the set deviation range, it is determined that there is a current sampling deviation.

[0018] In some embodiments of this application, the determination module is further configured as follows:

[0019] Calculate the magnitude difference between any two phase currents;

[0020] Determine if there are any amplitude differences that are outside the set amplitude difference range;

[0021] If the amplitude difference is outside the set amplitude difference range, the three-phase current of the fan is determined to be unbalanced.

[0022] In some embodiments of this application, the determination module is further configured as follows:

[0023] After determining that the three-phase current of the fan is unbalanced, three-phase imbalance compensation is performed.

[0024] Then, reassess whether the three-phase current is unbalanced. If the three-phase current of the fan is again determined to be unbalanced, an alarm will be triggered.

[0025] In some embodiments of this application, the wind turbine fault diagnosis system further includes:

[0026] A fan temperature acquisition module, configured to acquire the fan temperature;

[0027] The judgment module is further configured as follows:

[0028] Receive the fan temperature sent by the fan temperature acquisition module;

[0029] Determine whether the fan temperature has reached the set temperature threshold;

[0030] If the fan temperature reaches the set temperature threshold, it is determined that the fan temperature rise is too high.

[0031] In some embodiments of this application, the determination module is further configured as follows:

[0032] After determining that the fan temperature rise is too high, reduce the fan's input power.

[0033] In some embodiments of this application, the fan temperature acquisition module specifically includes:

[0034] The input power acquisition unit is configured to acquire the input power of the fan.

[0035] An outdoor ambient temperature acquisition unit is configured to acquire the outdoor ambient temperature.

[0036] The storage unit is configured to store the relationship between the fan input power, the outdoor ambient temperature, and the fan temperature.

[0037] The query unit is configured to obtain the fan temperature corresponding to the fan input power and outdoor ambient temperature based on the correspondence between the fan input power, outdoor ambient temperature and fan temperature.

[0038] In some embodiments of this application, the determination module is further configured as follows:

[0039] After determining that the wind turbine has malfunctioned, the fault information is uploaded to the cloud server.

[0040] Air conditioning equipment, including: the aforementioned fan fault diagnosis system.

[0041] The technical solution of this invention has the following advantages over the prior art: The fan fault diagnosis system and air conditioning equipment of this invention utilize a fluctuation amplitude acquisition module to acquire the current fluctuation amplitude of the fan; utilize a speed acquisition module to acquire the fan speed; and utilize a judgment module to determine whether the current fluctuation amplitude reaches a set fluctuation threshold. If the current fluctuation amplitude reaches the set fluctuation threshold, it is determined to be a valid current fluctuation. If the frequency of the valid current fluctuation is a multiple of the fan speed, it is determined that the fan blades or volute have failed. Therefore, the fan fault diagnosis system and air conditioning equipment of this invention accurately determine whether the fan blades or volute have failed by using the current fluctuation amplitude, the frequency of the valid current fluctuation, and the fan speed, thus solving the technical problem of difficulty in locating fan faults in the prior art.

[0042] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of one embodiment of the wind turbine fault diagnosis system of the present invention;

[0045] Figure 2 A flowchart of one embodiment of the steps performed by the determination module;

[0046] Figure 3 A flowchart of another embodiment of the steps performed by the determination module;

[0047] Figure 4A flowchart of another embodiment of the steps performed by the determination module;

[0048] Figure 5 A flowchart of another embodiment of the steps performed by the determination module;

[0049] Figure 6 A flowchart of another embodiment of the steps performed by the determination module;

[0050] Figure 7 A flowchart of another embodiment of the steps performed by the determination module;

[0051] Figure 8 This is a schematic diagram of another embodiment of the wind turbine fault diagnosis system of the present invention;

[0052] Figure 9 A flowchart of another embodiment of the steps performed by the determination module;

[0053] Figure 10 A flowchart of another embodiment of the steps performed by the determination module;

[0054] Figure 11 This is a schematic diagram of one embodiment of the fan temperature acquisition module. Detailed Implementation

[0055] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0056] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0057] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0058] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0059] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0060] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0061] Air conditioners execute refrigeration and heating cycles using a compressor, condenser, expansion valve, and evaporator. These cycles are controlled by a controller, which manages the refrigerant flow and the opening of the expansion valve. The refrigeration and heating cycles involve a series of processes including compression, condensation, expansion, and evaporation, ultimately supplying refrigerant to the conditioned and heat-exchanged air.

[0062] The compressor compresses refrigerant gas under high temperature and pressure and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0063] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0064] An air conditioner outdoor unit refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. An air conditioner indoor unit includes the indoor heat exchanger, and an expansion valve can be provided in either the outdoor or indoor unit.

[0065] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0066] The wind turbine fault diagnosis system of this embodiment includes a fluctuation amplitude acquisition module, a speed acquisition module, and a judgment module, etc., see [link to documentation]. Figure 1 As shown.

[0067] The fluctuation amplitude acquisition module is configured to acquire the current fluctuation amplitude of the fan.

[0068] The speed acquisition module is configured to acquire the speed of the fan.

[0069] The judgment module is configured as follows:

[0070] Receive the current fluctuation amplitude sent by the fluctuation amplitude acquisition module;

[0071] If the current fluctuation amplitude reaches the set fluctuation threshold, it is determined to be a valid current fluctuation;

[0072] If the frequency of the effective current fluctuation is a multiple of the fan speed, then the fan blades or volute are considered to be faulty.

[0073] Therefore, the judgment module performs the following steps, see [link to relevant documentation]. Figure 2 As shown.

[0074] Step S11: Receive the current fluctuation amplitude sent by the fluctuation amplitude acquisition module.

[0075] Step S12: Determine whether the current fluctuation amplitude has reached the set fluctuation threshold.

[0076] If the current fluctuation amplitude reaches the set fluctuation threshold, that is, the current fluctuation amplitude is greater than or equal to the set fluctuation threshold, then step S13 is executed.

[0077] Step S13: Determine that this current fluctuation is a valid current fluctuation.

[0078] Step S14: Determine whether the frequency of the effective current fluctuation is proportional to the speed of the fan.

[0079] If the effective frequency of the current fluctuation is a multiple of the fan speed, then proceed to step S15.

[0080] Step S15: Determine if the fan blades or volute are faulty.

[0081] When the fan blades or volute malfunction, the fan drive load changes; it no longer exhibits constant load characteristics at a fixed fan speed, causing load fluctuations in the motor drive. Utilizing the relationship between motor current (iq) and motor torque, to ensure a constant fan speed when the load changes, the fan current information must be dynamically adjusted. Therefore, the current information output by the fan drive will be superimposed on the fluctuation information of the load torque at the same frequency.

[0082] The equation of motion for the motor rotor is: Te - TL = J * dw / dt;

[0083] Where Te represents the fan torque, TL represents the fan load, J represents the moment of inertia, ω represents the rotational speed, and t represents the time.

[0084] Due to the missing fan blades, the fan load TL exhibits a pulsation frequency in sync with the speed ω. As the fan load TL fluctuates, in order to ensure the fan speed ω remains stable, the fan torque Te must change synchronously and at the same frequency to meet the load requirements.

[0085] Te = 3 / 2 * flux * iq; where flux is the magnetic flux and iq is the q-axis current.

[0086] As can be seen from the above formula, in order to ensure the fluctuation of the fan torque Te, the fan current iq must be guaranteed to change synchronously.

[0087] Therefore, by monitoring the fan current information in real time, if the current fluctuation amplitude reaches the set fluctuation threshold, it is determined to be a valid current fluctuation; if the frequency of the valid current fluctuation is a multiple of the fan speed, it is determined that the fan blades or volute have failed.

[0088] The current fluctuation amplitude of a wind turbine refers to the current fluctuation amplitude of any phase.

[0089] The wind turbine fault diagnosis system of this embodiment uses a fluctuation amplitude acquisition module to obtain the current fluctuation amplitude of the wind turbine; a speed acquisition module to obtain the wind turbine speed; and a judgment module to determine whether the current fluctuation amplitude reaches a set fluctuation threshold. If the current fluctuation amplitude reaches the set fluctuation threshold, it is determined to be a valid current fluctuation; if the frequency of the valid current fluctuation is a multiple of the wind turbine speed, it is determined that the wind turbine blades or volute have failed. Therefore, the wind turbine fault diagnosis system of this embodiment accurately determines whether the wind turbine blades or volute have failed by using the current fluctuation amplitude, the frequency of the valid current fluctuation, and the wind turbine speed, solving the technical problem of difficulty in locating wind turbine faults in the prior art.

[0090] In some embodiments of this application, the judgment module is further configured to: reduce the upper limit of the fan speed after determining that the fan blades or volute have failed.

[0091] That is, after the judgment module completes step S15, it also executes step S16, see [link to relevant documentation]. Figure 3 As shown.

[0092] Step S15: Determine if the fan blades or volute are faulty.

[0093] Step S16: Reduce the upper limit of the fan speed.

[0094] The upper speed limit refers to the highest setting or maximum speed of the fan.

[0095] When a fault is detected in the fan blades or volute, the maximum fan speed is reduced. If the current fan speed exceeds the maximum speed, the fan speed is controlled to decrease. This prevents damage to the fan caused by high input current due to fan blade failure, improves fan reliability, and ensures the operation of the entire unit.

[0096] Precision deviations are unavoidable in the hardware of the fan body or drive board. If these deviations exceed the drive control range, they will cause fan control abnormalities. More seriously, they can lead to unbalanced three-phase loads on the motor, resulting in overheating of the fan windings and motor replacement. Therefore, to ensure the normal operation of the fan, it is necessary to detect current sampling deviations and the balance of three-phase currents.

[0097] In some embodiments of this application, the determination module is further configured to perform the following steps, see [link to relevant documentation]. Figure 4 As shown.

[0098] Step S21: Calculate the deviation between the amplitude of any phase current and the reference value.

[0099] Step S22: Determine if there is a deviation that is outside the set deviation range.

[0100] If there is a deviation that is not within the set deviation range, then proceed to step S23.

[0101] Step S23: Determine if there is a current sampling deviation.

[0102] The three-phase current sampling circuit sends the collected three-phase current to the judgment module. The judgment module calculates the deviation between the amplitude of the phase current of each phase and the reference value. If the deviation is not within the set range, it is determined that there is a sampling deviation in the phase current.

[0103] When the deviation between the amplitude of any phase current in the three-phase current and the reference value is not within the set deviation range, it is determined that there is a current sampling deviation. The judgment method is simple, accurate and easy to implement.

[0104] In the initial stage of powering on the wind turbine, the three-phase current signal is periodically detected. If the deviation between the amplitude of any phase current and the reference value is not within the set deviation range, it is judged that there is a current sampling deviation (i.e., sampling reference deviation), and deviation calibration compensation is performed.

[0105] In some embodiments of this application, the judgment module is further configured to perform deviation calibration compensation after determining that there is a current sampling deviation.

[0106] That is, after the judgment module completes step S23, it also executes step S24, see [link to relevant documentation]. Figure 5 As shown.

[0107] Step S23: Determine if there is a current sampling deviation.

[0108] Step S24: Perform deviation calibration and compensation on the three-phase current.

[0109] After deviation calibration and compensation, the error in the three-phase current signal caused by sampling deviation can be eliminated, so as to ensure the stable and reliable operation of the fan.

[0110] When the judgment module determines that there is a sampling deviation in the phase current of any phase, it performs deviation calibration compensation on the phase current so that the deviation between the amplitude of the compensated current and the reference value is within the set deviation range, thereby ensuring the reliable operation of the fan.

[0111] In some embodiments of this application, the determination module is further configured to perform the following steps, see [link to relevant documentation]. Figure 6 As shown.

[0112] Step S31: Calculate the amplitude difference between any two phase currents.

[0113] Step S32: Determine whether there is an amplitude difference that is outside the set amplitude difference range.

[0114] If there is an amplitude difference that is not within the set amplitude difference range, then proceed to step S33.

[0115] Step S33: Determine if the three-phase current of the fan is unbalanced.

[0116] When the amplitude difference between any two phases of the three-phase current is not within the set amplitude difference range, it is determined that the three-phase current of the fan is unbalanced. The judgment method is simple, accurate and easy to implement.

[0117] In some embodiments of this application, the amplitude difference range is set to [-5%, 5%]. Therefore, when the phase-to-phase current amplitude difference is not within [-5%, 5%], it is determined that the three-phase current is unbalanced.

[0118] In some embodiments of this application, the determination module is further configured as follows:

[0119] After determining that the three-phase current of the fan is unbalanced, three-phase imbalance compensation is performed.

[0120] Then, reassess whether the three-phase current is unbalanced. If the three-phase current of the fan is again determined to be unbalanced, an alarm will be triggered.

[0121] That is, after the judgment module completes step S33, it also executes step S34, see [link to relevant documentation]. Figure 7 As shown.

[0122] Step S33: Determine if the three-phase current of the fan is unbalanced.

[0123] Step S34: Perform three-phase imbalance compensation.

[0124] When the amplitude difference between two phase currents is detected to be outside the set amplitude difference range, the smaller phase current is compensated for for imbalance.

[0125] Step S35: Reassess whether the three-phase current is unbalanced.

[0126] That is, recalculate the amplitude difference between any two phase currents to determine whether there is an amplitude difference that is outside the set amplitude difference range.

[0127] If there is an amplitude difference that is not within the set amplitude difference range, then proceed to step S36.

[0128] Step S36: Determine that the three-phase current of the fan is unbalanced and issue an alarm.

[0129] If the three-phase current imbalance is still detected after three-phase imbalance compensation, it means that the compensation is ineffective and an alarm should be triggered in time to remind personnel to carry out maintenance.

[0130] After performing three-phase imbalance compensation, if the three-phase current is determined to be balanced, it indicates that the compensation is effective, achieving consistency in current amplitude, and the fan continues to operate, ensuring stable and reliable operation of the fan.

[0131] During the operation of the fan, the amplitude of the three-phase current is dynamically detected. When the three-phase current is determined to be unbalanced, three-phase imbalance compensation is performed to avoid the unbalanced load between the motor phases caused by the three-phase imbalance.

[0132] Therefore, the wind turbine fault diagnosis system in this embodiment dynamically detects the amplitude of the three-phase circuit of the wind turbine and analyzes the balance of the three-phase current in real time. At the initial power-on stage of the wind turbine, the accuracy of the three-phase current hardware sampling is confirmed. If the deviation between the amplitude of any phase current and the reference value is not within the set deviation range, a current sampling deviation is determined, and deviation calibration compensation is performed. Secondly, after completing the deviation calibration compensation, the three-phase motor current during wind turbine operation is detected in real time, and the differences between the three-phase current amplitudes are analyzed and compared to confirm the current imbalance of the wind turbine operation, thereby achieving wind turbine imbalance detection.

[0133] Therefore, during the initial power-on phase of the wind turbine, it is determined whether there is a current sampling deviation. If a deviation is found, deviation calibration and compensation are performed. During wind turbine operation, the three-phase current of the wind turbine is monitored in real time to determine whether the three-phase current is unbalanced. If an imbalance is found, three-phase imbalance compensation is performed.

[0134] In some embodiments of this application, the fan fault diagnosis system further includes a fan temperature acquisition module, see [link to relevant documentation]. Figure 8 As shown.

[0135] The fan temperature acquisition module is configured to acquire the fan temperature.

[0136] The judgment module is also configured as follows:

[0137] Receive the fan temperature sent by the fan temperature acquisition module;

[0138] Determine if the fan temperature has reached the set temperature threshold;

[0139] If the fan temperature reaches the set temperature threshold, it is determined that the fan temperature rise is too high.

[0140] The decision module performs the following steps, see [link / reference]. Figure 9 As shown.

[0141] Step S41: Receive the fan temperature sent by the fan temperature acquisition module.

[0142] Step S42: Determine whether the fan temperature has reached the set temperature threshold.

[0143] If the fan temperature reaches the set temperature threshold, proceed to step S43.

[0144] Step S43: Determine that the fan temperature rise is too high.

[0145] When the fan temperature reaches the set temperature threshold, it is determined that the fan temperature rise is too high. The judgment method is simple, accurate and easy to implement.

[0146] In some embodiments of this application, the determination module is further configured as follows:

[0147] After determining that the fan temperature rise is too high, reduce the fan's input power.

[0148] That is, after the judgment module completes step S43, it also executes step S44, see [link to relevant documentation]. Figure 10 As shown.

[0149] Step S43: Determine that the fan temperature rise is too high.

[0150] Step S44: Reduce the input power of the fan.

[0151] By reducing the input power of the fan, the fan temperature is reduced, thereby achieving fan temperature protection and extending the fan's service life.

[0152] After determining that the fan temperature rise is too high, the judgment module sets an upper limit for the fan operating current to ensure that the fan operates within a safe current range.

[0153] In some embodiments of this application, the fan temperature acquisition module specifically includes an input power acquisition unit, an outdoor ambient temperature acquisition unit, a storage unit, a query unit, etc., see [link to relevant documentation]. Figure 11 As shown.

[0154] The input power acquisition unit is configured to acquire the input power of the fan.

[0155] The outdoor ambient temperature acquisition unit is configured to acquire the outdoor ambient temperature. This unit receives the temperature data sent by an outdoor temperature sensor to obtain the outdoor ambient temperature.

[0156] The storage unit is configured to store the relationship between the fan input power, the outdoor ambient temperature, and the fan temperature.

[0157] The query unit is configured to obtain the fan temperature corresponding to the fan input power and outdoor ambient temperature based on the correspondence between the fan input power, outdoor ambient temperature and fan temperature.

[0158] The storage unit stores a preset correspondence between the fan input power, outdoor ambient temperature, and fan temperature, which is represented by a curve.

[0159] During the actual operation of the air conditioning unit, the curve relationship between the fan temperature and the fan input power and the outdoor ambient temperature is fitted and saved in the storage unit.

[0160] When it is necessary to know the fan temperature, first obtain the current fan input power and outdoor ambient temperature. Then, based on the corresponding relationship, i.e., the pre-fitted curve relationship, the corresponding fan temperature (which can be called the equivalent temperature of the fan body) can be obtained. Through this curve, the fan body temperature corresponding to the fan input power and outdoor ambient temperature can be obtained.

[0161] Therefore, it is simple and convenient to infer the motor temperature by using the input power of the fan (output power of the motor driver) and the outdoor ambient temperature. Moreover, since there is no need to install a temperature sensor inside the fan, the cost of the fan is reduced.

[0162] In some embodiments of this application, the determination module is configured as follows:

[0163] The fan is deemed to have malfunctioned if any of the following conditions are met;

[0164] Condition a: The frequency of effective current fluctuation is a multiple of the fan speed;

[0165] Condition b: The deviation between the amplitude of any phase current and the reference value is not within the set deviation range;

[0166] Condition c: The amplitude difference between any two phase currents is not within the set amplitude difference range;

[0167] Condition d: The fan temperature reaches the set temperature threshold.

[0168] If any one of the conditions is met, it can be determined that the fan has malfunctioned, thus achieving accurate determination of the fan malfunction.

[0169] In some embodiments of this application, the determination module is further configured as follows:

[0170] After determining that the wind turbine has malfunctioned, the fault information is uploaded to the cloud server.

[0171] When the judgment module determines that there is a fault in the fan blades or volute, a current sampling deviation, a three-phase current imbalance in the fan, or an excessively high temperature rise in the fan, it promptly uploads the fault information to the cloud server for storage and later maintenance. Furthermore, it allows maintenance personnel to easily access the cloud server to obtain fan fault information.

[0172] The wind turbine fault diagnosis system in this embodiment detects wind turbine current information in real time and designs a frequency selector to compare the relationship between the wind turbine current fluctuation frequency and the wind turbine speed in real time. If the wind turbine current fluctuation amplitude exceeds the set fluctuation threshold at the corresponding frequency, the system confirms that the wind turbine blade or volute is faulty and transmits the fault. At the same time, the system reduces the upper limit capacity of the wind turbine.

[0173] The wind turbine fault diagnosis system in this embodiment realizes online fault diagnosis function, which can detect the operating characteristics of the wind turbine in real time, diagnose the current operating status of the wind turbine, and upload the data to the cloud server to identify risks in advance. Secondly, it also realizes online adjustment function, which can actively adjust the operating performance of the wind turbine, reduce the probability of wind turbine failure, and extend the service life of the wind turbine.

[0174] The fan fault diagnosis system in this embodiment mainly relates to the drive field of outdoor fans of air conditioning equipment. It solves the problem of fault location when the outdoor fan is in an abnormal state during operation, and at the same time helps to identify the operating status of the outdoor fan in advance and extend the service life of the fan.

[0175] The wind turbine fault diagnosis system in this embodiment diagnoses the wind turbine status online, adjusts the wind turbine operating parameters in real time, ensures the wind turbine's operating performance, and improves the reliability of wind turbine operation.

[0176] The wind turbine fault diagnosis system in this embodiment performs online real-time diagnosis of motor temperature, three-phase current balance, and fan blade or volute faults, enabling rapid fault location of outdoor wind turbines during operation.

[0177] The wind turbine fault diagnosis system of this embodiment has the following advantages:

[0178] (1) It has online diagnostic and online adjustment functions to monitor and adjust the fan information in real time. The judgment module can be divided into an online diagnostic unit and an online adjustment unit. The online diagnostic unit is used to diagnose fan faults online, and the online adjustment unit is used for online adjustment and compensation.

[0179] (2) Perform online real-time diagnosis of motor temperature, three-phase current balance and fan blade or volute faults respectively to confirm the safety margin.

[0180] (3) To ensure the safety and reliability of the wind turbine, after the online diagnostic unit determines the diagnostic results, the online adjustment unit performs directional compensation and adjustment operations; then the fault point and fault cause are uploaded to the cloud server.

[0181] (4) Obtain the real-time motor body temperature. After the online diagnostic unit determines that the fan temperature rise is too high, the online adjustment unit reduces the input power of the fan.

[0182] (5) The online diagnostic unit analyzes the sampling deviation of the sampling circuit and the imbalance of the three-phase current of the motor, and the online adjustment unit performs directional compensation operation.

[0183] (6) Regarding fan blade or volute faults: The online diagnostic unit analyzes the motor current signal to determine the current working status of the motor fan blade or volute; based on the current working status, the online adjustment unit performs the corresponding operation to ensure the reliability of operation under fan fault conditions.

[0184] In some embodiments of this application, the fan refers to the outdoor fan of an air conditioning unit.

[0185] In some embodiments of this application, the fan fault diagnosis system can be set up independently of the outdoor unit.

[0186] In some embodiments of this application, the wind turbine fault diagnosis system can also be integrated into the outdoor unit. For example, the wind turbine fault diagnosis system is integrated into the outdoor base plate of the outdoor unit.

[0187] Based on the design of the above-mentioned fan fault diagnosis system, this embodiment also proposes an air conditioning device, including the aforementioned fan fault diagnosis system.

[0188] By designing the aforementioned fan fault diagnosis system in air conditioning equipment, fan faults can be accurately determined, solving the technical problem of difficulty in locating fan faults in the prior art.

[0189] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0190] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A wind turbine fault diagnosis system, characterized in that, include: The fluctuation amplitude acquisition module is configured to acquire the current fluctuation amplitude of the fan. The speed acquisition module is configured to acquire the speed of the fan. The judgment module is configured to receive the current fluctuation amplitude sent by the fluctuation amplitude acquisition module; If the current fluctuation amplitude reaches the set fluctuation threshold, it is determined to be a valid current fluctuation; if the frequency of the valid current fluctuation is a multiple of the fan speed, it is determined that the fan blades or volute have failed.

2. The wind turbine fault diagnosis system according to claim 1, characterized in that: The judgment module is further configured as follows: After determining that the fan blades or volute are faulty, reduce the upper limit of the fan speed.

3. The wind turbine fault diagnosis system according to claim 1, characterized in that: The judgment module is further configured as follows: Calculate the deviation between the amplitude of any phase current and the reference value; Determine if there is a deviation that is outside the set deviation range; If there is a deviation that is outside the set deviation range, it is determined that there is a current sampling deviation.

4. The wind turbine fault diagnosis system according to claim 1, characterized in that: The judgment module is further configured as follows: Calculate the magnitude difference between any two phase currents; Determine if there are any amplitude differences that are outside the set amplitude difference range; If the amplitude difference is outside the set amplitude difference range, the three-phase current of the fan is determined to be unbalanced.

5. The wind turbine fault diagnosis system according to claim 4, characterized in that: The judgment module is further configured as follows: After determining that the three-phase current of the fan is unbalanced, three-phase imbalance compensation is performed. Then, reassess whether the three-phase current is unbalanced. If the three-phase current of the fan is again determined to be unbalanced, an alarm will be triggered.

6. The wind turbine fault diagnosis system according to claim 1, characterized in that: The wind turbine fault diagnosis system also includes: A fan temperature acquisition module, configured to acquire the fan temperature; The judgment module is further configured as follows: Receive the fan temperature sent by the fan temperature acquisition module; Determine whether the fan temperature has reached the set temperature threshold; If the fan temperature reaches the set temperature threshold, it is determined that the fan temperature rise is too high.

7. The wind turbine fault diagnosis system according to claim 6, characterized in that: The judgment module is further configured as follows: After determining that the fan temperature rise is too high, reduce the fan's input power.

8. The wind turbine fault diagnosis system according to claim 6, characterized in that: The fan temperature acquisition module specifically includes: The input power acquisition unit is configured to acquire the input power of the fan. An outdoor ambient temperature acquisition unit is configured to acquire the outdoor ambient temperature. The storage unit is configured to store the relationship between the fan input power, the outdoor ambient temperature, and the fan temperature. The query unit is configured to obtain the fan temperature corresponding to the fan input power and outdoor ambient temperature based on the correspondence between the fan input power, outdoor ambient temperature and fan temperature.

9. The wind turbine fault diagnosis system according to any one of claims 1 to 8, characterized in that: The judgment module is further configured as follows: After determining that the wind turbine has malfunctioned, the fault information is uploaded to the cloud server.

10. An air conditioning device, characterized in that, include: The wind turbine fault diagnosis system as described in any one of claims 1 to 9.

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