Monitoring method, control method and system of wind generating set

Abstract

The invention provides a monitoring method, a control method and a system of a wind generating set. The wind generating set comprises a generator, a cabin and a specific part, the specific part is used for driving the generator to generate electricity; the monitoring method comprises the following steps: acquiring a monitoring signal of the wind generating set; the monitoring signal is a rotating speed signal of the generator, a first target signal in the rotating speed signal is extracted, the vibration amplitude of the specific component is determined according to the first target signal, and the first target signal comprises the characteristic frequency of the specific component; and in response to the monitoring signal being the vibration acceleration signal of the cabin, extracting a second target signal in the vibration acceleration signal, and determining the vibration amplitude of the cabin based on the second target signal. According to the vibration amplitude of the specific component and / or the vibration amplitude of the cabin, the wind generating set can be better monitored, and accidents such as collapse of the wind generating set can be more effectively prevented.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wind power generation, and in particular to a monitoring method, a control method and a system for a wind power generator set. Background Art

[0002] Wind turbines are important equipment for achieving sustainable development and green energy transformation. They can convert wind energy in nature into electrical energy. In order to make energy conversion more efficient, the rotor blades in wind turbines are made longer and longer, but this will cause the vibration amplitude of wind turbines to become larger and larger during operation, which may lead to accidents such as wind turbine collapse. Therefore, how to avoid accidents such as wind turbine collapse has become an urgent problem to be solved. Summary of the invention

[0003] The technical problem to be solved by the present disclosure is to overcome the defect in the prior art that the vibration amplitude of a wind turbine generator set during operation may become larger and larger, which is very likely to cause accidents such as collapse of the wind turbine generator set, and to provide a monitoring method, control method and system for a wind turbine generator set.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] In a first aspect, a monitoring method for a wind turbine generator set is provided, wherein the wind turbine generator set includes a generator, a nacelle, and a specific component; the specific component is used to drive the generator to generate electricity; the monitoring method includes:

[0006] Acquiring a monitoring signal of the wind turbine generator set;

[0007] In response to the monitoring signal being a rotation speed signal of the generator, extracting a first target signal from the rotation speed signal, and determining the vibration amplitude of the specific component according to the first target signal, wherein the first target signal includes a characteristic frequency of the specific component;

[0008] In response to the monitoring signal being a vibration acceleration signal of the nacelle, a second target signal is extracted from the vibration acceleration signal, and a vibration amplitude of the nacelle is determined based on the second target signal.

[0009] Optionally, extracting the first target signal from the speed signal includes:

[0010] The rotation speed signal is input into a first filter, and the center frequency and damping parameter of the first filter are matched with the characteristic frequency of the specific component to extract a first target signal matching the characteristic frequency.

[0011] Optionally, the specific component includes a blade of the wind turbine generator set and / or a transmission chain of the wind turbine generator set; the characteristic frequency corresponding to the first target signal includes at least one of an in-plane characteristic frequency of the blade, a rotation frequency of the blade, and a characteristic frequency of the transmission chain; wherein the rotation frequency of the blade is a frequency of the blade rotating n times, and n is a positive integer;

[0012] The extracting the first target signal from the rotation speed signal comprises:

[0013] For each characteristic frequency, the rotation speed signal is filtered by a first filter matching the characteristic frequency to extract a corresponding first target signal, wherein the center frequency and damping parameter of the first filter match the characteristic frequency of the first target signal.

[0014] The step of determining the vibration amplitude of the specific component according to the first target signal comprises:

[0015] Calculating a root mean square of the amplitude of the first target signal to obtain a first amplitude fluctuation amount;

[0016] The vibration amplitude of the specific component is determined according to the first amplitude fluctuation amount, wherein the magnitude of the first amplitude fluctuation amount is positively correlated with the vibration amplitude.

[0017] Optionally, extracting the second target signal from the vibration acceleration includes:

[0018] The vibration acceleration signal is respectively input into the second filter with different sliding average time for filtering processing to obtain the second target signal corresponding to the second amplitude fluctuation and each sliding average time; wherein the second amplitude fluctuation is negatively correlated with the size of the sliding average time.

[0019] Optionally, determining the vibration amplitude of the nacelle based on the second target signal comprises:

[0020] The vibration amplitude of the nacelle is determined according to the second amplitude fluctuation amount; wherein the second amplitude fluctuation amount is positively correlated with the vibration amplitude.

[0021] Optionally, the control method comprises:

[0022] Determining the vibration amplitude of the specific component and / or the nacelle according to any one of the wind turbine generator monitoring methods described above;

[0023] According to the vibration amplitude, a control strategy matching the vibration amplitude is executed on the wind turbine generator set.

[0024] Optionally, executing a control strategy matching the vibration amplitude on the wind turbine generator set according to the vibration amplitude includes:

[0025] In response to the vibration amplitude of the specific component satisfying a first preset condition, the wind turbine generator set is controlled to alarm and enter a safety mode; wherein the first preset condition includes at least one of the following: the vibration amplitude of the specific component is greater than or equal to a first vibration amplitude threshold and lasts for a first time interval, the vibration amplitude of the specific component is greater than or equal to a second vibration amplitude threshold and lasts for a second time interval; wherein the safety mode includes shutdown or reduced capacity operation; the first vibration amplitude threshold is greater than the second vibration amplitude threshold; the first time interval is less than the second time interval.

[0026] Optionally, executing a control strategy matching the vibration amplitude on the wind turbine generator set according to the vibration amplitude includes:

[0027] In response to the sliding average time and the vibration amplitude of the nacelle satisfying a second preset condition, the wind turbine generator set is controlled to alarm and enter a safety mode; wherein the safety mode includes shutdown or reduced capacity operation;

[0028] The second preset condition includes at least one of the following:

[0029] The sliding average time is a first value and the vibration amplitude of the nacelle is greater than or equal to a third vibration amplitude threshold;

[0030] The sliding average time is a second value and the vibration amplitude of the nacelle is greater than or equal to a fourth vibration amplitude threshold;

[0031] The sliding average time is a third value and the vibration amplitude of the nacelle is greater than or equal to a fifth vibration amplitude threshold;

[0032] The first value, the second value and the third value decrease in sequence;

[0033] The third vibration amplitude threshold, the fourth vibration amplitude threshold, and the fifth vibration amplitude threshold increase in sequence.

[0034] Optionally, the executing a control strategy matching the vibration amplitude on the wind turbine generator set according to the vibration amplitude further includes:

[0035] In response to the wind turbine generator set entering the safety mode for a target time period, it is determined whether to control the wind turbine generator set to exit the safety mode according to the vibration amplitude.

[0036] In a third aspect, a monitoring system for a wind turbine generator set is provided, wherein the wind turbine generator set comprises a generator, a nacelle and a specific component; the specific component is used to drive the generator to generate electricity; and the monitoring system comprises:

[0037] An acquisition module, used for acquiring a monitoring signal of the wind turbine generator set;

[0038] a first response module, in response to the monitoring signal being a rotation speed signal of the generator, extracting a first target signal from the rotation speed signal, and determining the vibration amplitude of the specific component according to the first target signal, wherein the first target signal includes a characteristic frequency of the specific component;

[0039] The second response module extracts a second target signal from the vibration acceleration signal in response to the monitoring signal being a vibration acceleration signal of the nacelle, and determines the vibration amplitude of the nacelle based on the second target signal.

[0040] Optionally, the first response module includes:

[0041] The first extraction unit inputs the rotation speed signal into a first filter, wherein the center frequency and damping parameter of the first filter match the characteristic frequency of the specific component to extract a first target signal matching the characteristic frequency.

[0042] Optionally, the specific component includes a blade of the wind turbine generator set and / or a transmission chain of the wind turbine generator set; the characteristic frequency corresponding to the first target signal includes at least one of an in-plane characteristic frequency of the blade, a rotation frequency of the blade, and a characteristic frequency of the transmission chain; wherein the rotation frequency of the blade is a frequency of the blade rotating n times, and n is a positive integer;

[0043] The first response module includes:

[0044] The second extraction unit is used to filter the speed signal for each characteristic frequency through a first filter matching the characteristic frequency to extract a corresponding first target signal, wherein the center frequency and damping parameter of the first filter match the characteristic frequency of the first target signal.

[0045] Optionally, the first response module further includes:

[0046] a calculation unit, configured to calculate a root mean square of the amplitude of the first target signal to obtain a first amplitude fluctuation amount;

[0047] The first determining unit is used to determine the vibration amplitude of the specific component according to the first amplitude fluctuation amount, wherein the magnitude of the first amplitude fluctuation amount is positively correlated with the vibration amplitude.

[0048] Optionally, the second response module includes:

[0049] A processing unit is used to input the vibration acceleration signal into a second filter with different sliding average times for filtering processing to obtain a second target signal corresponding to the second amplitude fluctuation and each sliding average time; wherein the second amplitude fluctuation is negatively correlated with the size of the sliding average time.

[0050] Optionally, the second response module further includes:

[0051] A second determining unit is used to determine the vibration amplitude of the nacelle according to the second amplitude fluctuation amount; wherein the second amplitude fluctuation amount is positively correlated with the vibration amplitude.

[0052] In a fourth aspect, a control system for a wind turbine generator set is provided, wherein the control system comprises:

[0053] A determination module, configured to determine the vibration amplitude of the specific component and / or the nacelle according to any one of the above-mentioned monitoring methods for a wind turbine generator set;

[0054] An execution module is used to execute a control strategy matching the vibration amplitude on the wind turbine generator set according to the vibration amplitude. Optionally, the execution module includes:

[0055] The first response unit controls the wind turbine to alarm and enter a safety mode in response to the vibration amplitude of the specific component satisfying a first preset condition; wherein the first preset condition includes at least one of the following: the vibration amplitude of the specific component is greater than or equal to a first vibration amplitude threshold and lasts for a first time interval, and the vibration amplitude of the specific component is greater than or equal to a second vibration amplitude threshold and lasts for a second time interval; wherein the safety mode includes shutdown or reduced capacity operation; the first vibration amplitude threshold is greater than the second vibration amplitude threshold; the first time interval is less than the second time interval.

[0056] Optionally, the execution module includes:

[0057] A second response unit, in response to the sliding average time and the vibration amplitude of the nacelle satisfying a second preset condition, controls the wind turbine generator set to alarm and controls the wind turbine generator set to enter a safety mode; wherein the safety mode includes shutdown or reduced capacity operation;

[0058] The second preset condition includes at least one of the following:

[0059] The sliding average time is a first value and the vibration amplitude of the nacelle is greater than or equal to a third vibration amplitude threshold;

[0060] The sliding average time is a second value and the vibration amplitude of the nacelle is greater than or equal to a fourth vibration amplitude threshold;

[0061] The sliding average time is a third value and the vibration amplitude of the nacelle is greater than or equal to a fifth vibration amplitude threshold;

[0062] The first value, the second value and the third value decrease in sequence;

[0063] The third vibration amplitude threshold, the fourth vibration amplitude threshold, and the fifth vibration amplitude threshold increase in sequence.

[0064] Optionally, the execution module further includes:

[0065] The third response unit, in response to the wind turbine generator set entering the safety mode for a target time period, determines whether to control the wind turbine generator set to exit the safety mode according to the vibration amplitude.

[0066] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present disclosure.

[0067] The positive progressive effect of the present disclosure is that since the vibration state of a specific component and the vibration state of the nacelle are direct reflections of the vibration state of the wind turbine generator set, the vibration amplitude of the specific component can be accurately determined according to the first target signal extracted from the rotational speed signal of the generator, and the vibration amplitude of the nacelle can be accurately determined according to the second target signal extracted from the vibration acceleration signal of the nacelle, and then the wind turbine generator set can be better monitored according to the vibration amplitude of the component and / or the vibration amplitude of the nacelle, and accidents such as the collapse of the wind turbine generator set can be more effectively prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 A flow chart of a monitoring method for a wind turbine generator set provided in Embodiment 1 of the present disclosure;

[0069] Figure 2 A flow chart of a control method for a wind turbine generator set provided in Embodiment 2 of the present disclosure;

[0070] Figure 3 A flow chart of executing a control strategy for a wind turbine generator set according to a vibration amplitude determined by a first target signal in a control method for a wind turbine generator set provided in Embodiment 2 of the present disclosure;

[0071] Figure 4 A flow chart of executing a control strategy for a wind turbine generator set according to a vibration amplitude determined by a second target signal in a control method for a wind turbine generator set provided in Embodiment 2 of the present disclosure;

[0072] Figure 5 A module schematic diagram of a monitoring system for a wind turbine generator set provided in Embodiment 3 of the present disclosure;

[0073] Figure 6 A module schematic diagram of a control system of a wind turbine generator set provided in Example 4 of the present disclosure. DETAILED DESCRIPTION

[0074] The present disclosure is further described below by way of examples, but the present disclosure is not limited to the scope of the examples.

[0075] Prefixes such as "first" and "second" are used in the embodiments of the present disclosure only to distinguish different description objects, and have no limiting effect on the position, order, priority, quantity or content of the described objects. The use of prefixes such as ordinal numbers to distinguish description objects in the embodiments of the present disclosure does not constitute a limitation on the described objects. For the statement of the described objects, please refer to the description in the context of the embodiments, and no unnecessary limitation should be constituted due to the use of such prefixes. In addition, in the description of the present embodiment, unless otherwise specified, the meaning of "plurality" is two or more.

[0076] Example 1

[0077] In order to effectively prevent accidents such as collapse of wind turbines, embodiment 1 of the present disclosure provides a method for monitoring a wind turbine. Figure 1 A flow chart of a monitoring method for a wind turbine generator set provided in Example 1 of the present disclosure, wherein the wind turbine generator set includes a generator, a nacelle, and a specific component; the specific component is used to drive the generator to generate electricity; the monitoring method includes the following steps:

[0078] Step 101: Acquire a monitoring signal of the wind turbine generator set.

[0079] In addition to the generator, the nacelle and specific components, the wind turbine generator set also includes a hub. The specific component may be at least one of a blade and a transmission chain. The wind turbine blade is used to receive wind energy, and convert it into mechanical energy through the hub and the transmission chain and transmit it to the generator, and then the generator converts the mechanical energy into electrical energy. The monitoring signal may be a rotation speed signal of the generator and / or a vibration acceleration signal of the nacelle.

[0080] Step 102: In response to the monitoring signal being a rotation speed signal of the generator, extract a first target signal from the rotation speed signal, and determine the vibration amplitude of a specific component according to the first target signal, wherein the first target signal includes a characteristic frequency of the specific component.

[0081] The first target signal may be one or more. Since the characteristic frequencies of different specific components in the speed signal of the generator are different, the required first target signal can be extracted from the speed signal of the generator according to the characteristic frequency of the required specific component.

[0082] Since the wind energy received by the blades is transmitted to the generator through the transmission chain, the speed signal of the generator can reflect the speed of a specific component (at least one of the blades and the transmission chain) to a certain extent. Therefore, the characteristic frequency of the blades and / or the transmission chain can be extracted from the speed signal of the generator. In this way, the vibration amplitude of the blades and / or the transmission chain can be obtained by monitoring the speed signal of the generator, and the wind turbine generator set can be monitored more comprehensively.

[0083] Step 103: In response to the monitoring signal being a vibration acceleration signal of the cabin, extracting a second target signal from the vibration acceleration signal, and determining a vibration amplitude of the cabin based on the second target signal.

[0084] The second target signal may be one or more than one, and the vibration acceleration signal may be filtered according to a preset sliding average time to obtain the second target signal.

[0085] The nacelle is used to place the transmission chain, generator and other auxiliary equipment for power generation (such as converter). Therefore, the vibration acceleration of the nacelle can reflect the vibration amplitude of the equipment placed inside it to a certain extent, rather than the vibration amplitude of a single component. In this way, a sensor can be directly set on the nacelle to obtain the vibration acceleration of the nacelle, and then by monitoring the vibration acceleration of the nacelle, all components placed in the nacelle can be monitored. Therefore, this will make the monitoring of the wind turbine generator set more comprehensive.

[0086] In this embodiment, since the vibration state of the specific component and the vibration state of the cabin are direct reflections of the vibration state of the wind turbine generator set, the vibration amplitude of the specific component can be accurately determined according to the first target signal extracted from the rotational speed signal of the generator, and the vibration amplitude of the cabin can be accurately determined according to the second target signal extracted from the vibration acceleration signal of the cabin. Then, the wind turbine generator set can be better monitored according to the vibration amplitude of the specific component and / or the vibration amplitude of the cabin, and the occurrence of accidents such as the collapse of the wind turbine generator set can be more effectively prevented. In addition, according to the monitoring of the rotational speed signal and / or the vibration acceleration signal of the generator, the vibration state of the specific component and / or the cabin can be monitored respectively to prevent the occurrence of abnormal vibration of the specific component and / or the cabin, which leads to damage to the specific component and / or the cabin.

[0087] In one embodiment, extracting the first target signal from the rotation speed signal includes:

[0088] The rotation speed signal is input to a first filter, and the center frequency and damping parameter of the first filter are matched with the characteristic frequency of a specific component to extract a first target signal matching the characteristic frequency.

[0089] In this embodiment, using a first filter whose center frequency and damping parameters match the characteristic frequency of a specific component can more effectively filter out noise and interference that are not related to the characteristic frequency, thereby improving the quality of the extracted first target signal.

[0090] In one embodiment, the specific components include blades of the wind turbine generator set and / or a transmission chain of the wind turbine generator set; the characteristic frequency corresponding to the first target signal includes at least one of the in-plane characteristic frequency of the blade, the rotation frequency of the blade, and the characteristic frequency of the transmission chain; wherein the rotation frequency of the blade is the frequency of the blade rotating n times, and n is a positive integer. It should be noted that after the introduction of the gearbox, the rotation speed of the transmission chain will increase, so preferably, the characteristic frequency of the transmission chain may include a first characteristic frequency and a second characteristic frequency, the rotation frequency of the blade is the characteristic frequency of the transmission chain when it is operating normally, and the second speed frequency is the characteristic frequency of the transmission chain after the introduction of the gearbox. In addition, the frequency of the blade rotating n times may be the np characteristic frequency of the blade (np represents the nth order, that is, the inverse of the time required for the wind wheel to rotate n times, and n is a positive integer For example, 1p represents the first order, i.e. the wind turbine rotates The reciprocal of the time required for one revolution). Characteristic frequency within the blade surface The frequency signal may refer to the blade in-plane characteristic frequency, which refers to the natural vibration frequency of the blade in the in-plane direction.

[0091] In one embodiment, the specific components include blades of the wind turbine and / or a transmission chain of the wind turbine; the characteristic frequencies corresponding to the first target signal include at least two of the in-plane characteristic frequencies of the blades, the rotational frequencies of the blades, and the characteristic frequencies of the transmission chain.

[0092] It should be noted that, since the rotation frequency of the blade refers to the np characteristic frequency of the blade, the rotation frequency of the blade refers to at least one of the 1p characteristic frequency of the blade, the 1p characteristic frequency of the blade…the xp characteristic frequency of the blade, where x∈[1,n]. Therefore, the first target signal may also be at least two of the rotation frequencies of the blade, for example: the first target signal is the 1p characteristic frequency of the blade and the 2p characteristic frequency of the blade. Similarly, the first target signal may also be the first characteristic frequency of the transmission chain and the second characteristic frequency of the transmission chain.

[0093] Extracting the first target signal from the speed signal includes: for each characteristic frequency, filtering the speed signal through a first filter that matches the characteristic frequency to extract the corresponding first target signal, the center frequency and damping parameters of the first filter are matched with the center frequency and damping parameters of the first filter, so that the extraction of the characteristic frequency can be carried out synchronously to improve the efficiency of the first target signal. And using the first filter whose center frequency and damping parameters match the characteristic frequency of a specific component can more effectively filter out noise and interference that are not related to the characteristic frequency, thereby improving the quality of the extracted first target signal.

[0094] In one embodiment, determining the vibration amplitude of a specific component according to the first target signal includes:

[0095] S1: Calculate the root mean square of the amplitude of the first target signal to obtain a first amplitude fluctuation.

[0096] Preferably, the root mean square filtering technology can be used to calculate the root mean square of the amplitude of the first target signal. The root mean square filtering is a common signal processing technology, which is usually used to calculate the "effective value" or "root mean square value" of the first target signal. The obtained root mean square is used to characterize the signal energy or power of the first target signal.

[0097] S2: Determine the vibration amplitude of the specific component according to the first amplitude fluctuation amount, wherein the magnitude of the first amplitude fluctuation amount is positively correlated with the vibration amplitude.

[0098] In this embodiment, the first amplitude fluctuation amount obtained by calculating the root mean square of the amplitude of the first target signal can better evaluate the average energy level of the first target signal, and can also better remove the noise and interference of the first target signal, retain the main features of the first target signal, and make the first target signal purer. It can more accurately reflect the vibration amplitude of a specific component, thereby improving the accuracy of monitoring the wind turbine generator set.

[0099] In one embodiment, extracting the second target signal from the vibration acceleration includes:

[0100] The vibration acceleration signals are respectively input into second filters with different sliding average times for filtering processing to obtain second target signals corresponding to the second amplitude fluctuation and each sliding average time; wherein the second amplitude fluctuation is negatively correlated with the size of the sliding average time.

[0101] For example, if different sliding average times are set to 1 second, 5 seconds and 10 seconds, the corresponding second filters will take points on the vibration acceleration signal with different sliding average times, for example: 1 second / time, 5 seconds / time, 10 seconds / time. Therefore, different second filters will output second target signals with different amplitude fluctuations, and the peaks in the vibration acceleration signal will be removed after processing by the second filter to make the obtained second target signal smoother.

[0102] In this embodiment, the second target signal of different second amplitude fluctuation amounts can capture the vibration amplitude reflected by the vibration acceleration signal at different scales (for example, frequency scale, amplitude scale, energy scale, impact force scale, time scale, waveform scale), so as to perform multi-scale analysis of the vibration acceleration signal, thereby making the determined vibration amplitude of the cabin more accurate.

[0103] In one embodiment, determining the vibration amplitude of the nacelle based on the second target signal includes: determining the vibration amplitude of the nacelle according to a second amplitude fluctuation amount; wherein the second amplitude fluctuation amount is positively correlated with the vibration amplitude.

[0104] In this embodiment, the second amplitude fluctuation amount can better reflect the vibration acceleration signal of the nacelle, and further can more accurately reflect the vibration amplitude of the wind turbine generator set, so as to improve the accuracy of monitoring the wind turbine generator set.

[0105] Example 2

[0106] Embodiment 2 of the present disclosure provides a control method for a wind turbine generator set. Figure 2 This is a flow chart of a control method for a wind turbine generator set provided in Embodiment 2 of the present disclosure. The control method includes:

[0107] Step 201: Determine the vibration amplitude of the specific component and / or the nacelle.

[0108] The vibration amplitude of the specific component and / or the nacelle is determined by the monitoring method of the wind turbine generator set provided by any of the above embodiments.

[0109] Step 202: According to the vibration amplitude, a control strategy matching the vibration amplitude is executed on the wind turbine generator set.

[0110] In this embodiment, by controlling the wind turbine generator set with the vibration amplitude matching control strategy, the vibration of the wind turbine generator set during operation can be effectively suppressed, thereby not only avoiding the collapse of the wind turbine generator set due to excessive vibration amplitude of the wind turbine generator set, but also improving the operating stability of the unit.

[0111] In one embodiment, controlling the wind turbine generator set includes:

[0112] In response to the vibration amplitude of a specific component satisfying a first preset condition, the wind turbine generator set is controlled to alarm and enter a safety mode; wherein the first preset condition includes at least one of the following: the vibration amplitude of the specific component is greater than or equal to a first vibration amplitude threshold and lasts for a first time interval, the vibration amplitude of the specific component is greater than or equal to a second vibration amplitude threshold and lasts for a second time interval; wherein the safety mode includes shutdown or reduced capacity operation; the first vibration amplitude threshold is greater than the second vibration amplitude threshold; the first time interval is less than the second time interval.

[0113] For example, when the specific component is in normal operation, its rotation speed is 0.01 rpm, and it suddenly increases to 1 rpm, which is manifested as a sudden increase in the vibration amplitude of the specific component. This sudden increase indicates that the wind turbine is likely to have problems. Therefore, in this case, a shorter time interval is required, such as 1 second, to issue an alarm and control the wind turbine to enter the safe mode, so as to promptly remind the maintenance personnel to solve the problem as soon as possible and prevent the wind turbine from continuing to operate and causing its collapse.

[0114] For example, the speed of the specific component is 0.3 rpm in normal operation, but it increases to 0.4 rpm, which means that the vibration amplitude of the specific component may only increase slightly. At this time, it may not be a problem with the wind turbine generator set, but a normal speed fluctuation. Therefore, it is necessary to continue monitoring. If the speed is 0.4 rpm for 10 seconds (i.e., the second time interval), it indicates that the wind turbine generator set is likely to have a problem. At this time, an alarm can be issued and the wind turbine generator set can be controlled to enter a safe mode to remind maintenance personnel to solve the problem as soon as possible and prevent the wind turbine generator set from continuing to operate and causing it to collapse.

[0115] It should be noted that in response to the vibration amplitude of a specific component satisfying the first preset condition, the wind turbine generator set alarm is controlled, which means that if the vibration amplitude of the specific component is monitored to satisfy any one of the first preset conditions, a prompt of abnormal vibration of the specific component will be issued. For example, if the characteristic frequency within the blade surface is greater than 1 rpm and lasts for 5 seconds, the alarm prompt is abnormal blade vibration.

[0116] In this embodiment, the wind turbine generator set is graded and controlled according to different vibration amplitudes. Different control strategies can be adopted to control the wind turbine generator set according to the response of the vibration amplitude, so as to promptly remind maintenance personnel to solve the problem as soon as possible and prevent the wind turbine generator set from continuing to operate and causing its collapse, thereby improving the operating safety of the wind turbine generator set.

[0117] In one embodiment, according to the vibration amplitude, a control strategy matching the vibration amplitude is executed on the wind turbine generator set, including:

[0118] In response to the moving average time and the vibration amplitude of the nacelle satisfying a second preset condition, control the wind turbine to alarm and control the wind turbine to enter a safety mode; wherein, the safety mode includes shutdown or derated operation; wherein, the second preset condition includes at least one of the following: the moving average time is a first value and the vibration amplitude of the nacelle is greater than or equal to a third vibration amplitude threshold; the moving average time is a second value and the vibration amplitude of the nacelle is greater than or equal to a fourth vibration amplitude threshold; the moving average time is a third value and the vibration amplitude of the nacelle is greater than or equal to a fifth vibration amplitude threshold; the first value, the second value, and the third value decrease in sequence; the third vibration amplitude threshold, the fourth vibration amplitude threshold, and the fifth vibration amplitude threshold increase in sequence.

[0119] For example, to ensure the safety and stability of the operation of the wind turbine, the key vibration alarm thresholds can be set as the third vibration amplitude threshold, the fourth vibration amplitude threshold, and the fifth vibration amplitude threshold according to actual needs. The moving average time can be t1 (the first value) > t2 (the second value) > t3 (the third value), and the key vibration alarm thresholds vibrate_limit1 (the third vibration amplitude threshold) < vibrate_limit2 (the fourth vibration amplitude threshold) < vibrate_limit3 (the fifth vibration amplitude threshold).

[0120] It should be noted that the smaller the moving average time, the greater the fluctuation of the corresponding second target signal after filtering processing, and the greater the fluctuation of the vibration amplitude of the nacelle determined according to the second target signal.

[0121] In addition, controlling the wind turbine to alarm in response to the moving average time and the vibration amplitude of the nacelle satisfying the second preset condition means that if it is monitored that the vibration amplitude of the nacelle satisfies any one of the second preset conditions, a prompt of abnormal vibration of the nacelle will be issued.

[0122] Therefore, when the moving average time is t3, for example, t3 = 1 second, the corresponding second filter samples the vibration acceleration signal of the nacelle at a frequency of 1 second / time. In this way, the fluctuation of the obtained second target signal is the largest, and the fluctuation of the corresponding vibration amplitude of the nacelle is the largest. Therefore, a relatively large vibrate_limit3 (the fifth vibration amplitude threshold) needs to be set for it, which can not only prevent incorrect control of the wind turbine, but also timely warn of potential vibration problems of the wind turbine and avoid damage to the structural components of the wind turbine due to problems such as wind condition changes.

[0123] When the sliding average time is t2, for example t2 = 5 seconds, the corresponding second filter samples the vibration acceleration signal of the cabin at a frequency of 5 seconds / time, so that the fluctuation amount of the second target signal obtained is moderate, and the corresponding fluctuation amount of the vibration amplitude of the cabin is also moderate. Therefore, it is necessary to set a moderate vibrate_limit2 (fourth vibration amplitude threshold) for it, which can not only prevent the wrong control of the wind turbine, but also timely warn of potential vibration problems of the wind turbine, and avoid damage to the structural components of the wind turbine due to problems such as changes in wind conditions.

[0124] When the sliding average time is t1, for example t1 = 10 seconds, the corresponding second filter samples the vibration acceleration signal of the cabin at a frequency of 10 seconds / time, so that the fluctuation of the second target signal obtained is the smallest, and the fluctuation of the corresponding vibration amplitude of the cabin is also the smallest. Therefore, it is necessary to set a smaller vibrate_limit1 (third vibration amplitude threshold) for it, which can not only prevent the incorrect control of the wind turbine generator set, but also ensure that timely measures are taken when any abnormal vibration occurs.

[0125] It should be noted that the alarm levels of each level are the same, and any abnormal vibration amplitude will trigger an alarm, and if any two or three are abnormal at the same time, an alarm will be triggered at the same time.

[0126] In this embodiment, graded alarms are performed according to the amplitude fluctuations of different vibration amplitudes, and different control strategies can be adopted to perform alarm control on the wind turbine generator set according to the vibration amplitude, so as to promptly remind maintenance personnel to solve the problem as soon as possible and prevent the wind turbine generator set from continuing to operate and causing its collapse. In addition, potential vibration problems of the wind turbine generator set can be warned in advance to avoid damage to the structural components of the wind turbine generator set due to problems such as changes in wind conditions, thereby improving the operational safety of the wind turbine generator set.

[0127] In one embodiment, according to the vibration amplitude, the step of executing a control strategy matching the vibration amplitude on the wind turbine generator set includes:

[0128] In response to the wind turbine generator set entering the safety mode for a target time period, it is determined whether to control the wind turbine generator set to exit the safety mode according to the vibration amplitude.

[0129] To prevent the wind turbine from frequently entering the safety mode, a target duration can be set. For example, the target duration is 10 minutes, and it takes at least 10 minutes to enter the safety mode before exiting the safety mode. If any of the above alarms is triggered again within 10 minutes, the timer will be reset.

[0130] In addition, before exiting the safety mode, it is necessary not only to consider whether the target duration has been reached, but also to determine whether the various indicators of the wind turbine generator set are abnormal based on the vibration amplitude of the wind force (any of the conditions that lead to the alarm in the above embodiments means that the wind turbine generator set has an abnormal indicator). If all indicators meet the corresponding conditions, the wind turbine generator set can exit the safety mode.

[0131] In this embodiment, when the wind turbine generator set is in the frequent safety mode, its mechanical parts will accelerate wear due to stress changes during the start-stop process. Therefore, setting a target duration can reduce such frequent starts and stops, thereby extending the service life of the wind turbine generator set. When it is detected that all indicators of the wind turbine generator set meet the corresponding conditions and reach the target duration, the wind turbine generator set can be controlled to exit the safety mode. This can ensure that the wind turbine generator set will not frequently enter and exit the safety mode, and can also ensure that all indicators of the wind turbine generator set exiting the safety mode are normal, thereby preventing the operation safety of the wind turbine generator set.

[0132] In one embodiment, Figure 3 A flow chart of executing a control strategy for a wind turbine generator set according to a vibration amplitude determined by a first target signal in a control method for a wind turbine generator set provided in Embodiment 2 of the present disclosure, combined with Figure 3 , the control method of the wind turbine generator set disclosed in the present invention is further explained.

[0133] S1: extracting a first target signal from the engine speed signal.

[0134] The corresponding characteristic frequency in the first target signal includes at least one of the in-plane characteristic frequency of the blade, the rotation frequency of the blade, and the characteristic frequency of the transmission chain.

[0135] S2: Calculate the root mean square of the first target signal to obtain an energy signal of the first target signal.

[0136] The energy signal of the first target signal is used to characterize a first amplitude fluctuation amount of the first target signal.

[0137] S3: Determine the vibration amplitude of the specific component according to the energy signal of the first target signal.

[0138] S4: Determine whether the vibration amplitude of the specific component meets the first preset condition.

[0139] In step S4, if the judgment result is yes, step S5 is executed; if the judgment result is no, the wind turbine generator set is controlled to operate normally.

[0140] The first preset condition is that the first preset condition includes at least one of the following: the vibration amplitude of the specific component is greater than or equal to the first vibration amplitude threshold and lasts for a first time interval, the vibration amplitude of the specific component is greater than or equal to the second vibration amplitude threshold and lasts for a second time interval; wherein, the safety mode includes shutdown or reduced capacity operation; the first vibration amplitude threshold is greater than the second vibration amplitude threshold; the first time interval is less than the second time interval.

[0141] S5: Control the wind turbine generator set to alarm and enter safety mode.

[0142] It should be noted that the safety mode is reduced capacity operation or shutdown.

[0143] Figure 4 A flow chart of executing a control strategy for a wind turbine generator set according to a vibration amplitude determined by a second target signal in a control method for a wind turbine generator set provided in Embodiment 2 of the present disclosure; Figure 4 , the control method of the wind turbine generator set disclosed in the present invention is further explained.

[0144] S1: extracting the second target signal from the vibration acceleration signal of the cabin.

[0145] The vibration acceleration signals are respectively input into second filters with different sliding average times for filtering processing to obtain a second target signal.

[0146] S2: Determine the vibration amplitude of the nacelle according to the second target signal.

[0147] S3: Determine whether the sliding average time and the vibration amplitude of the cabin meet the second preset condition,

[0148] In step S3, if the judgment result is yes, step S4 is executed; if the judgment result is no, the wind turbine generator set is controlled to operate normally.

[0149] The second preset condition includes at least one of the following: the sliding average time is a first value and the vibration amplitude of the cabin is greater than or equal to a third vibration amplitude threshold; the sliding average time is a second value and the vibration amplitude of the cabin is greater than or equal to a fourth vibration amplitude threshold; the sliding average time is a third value and the vibration amplitude of the cabin is greater than or equal to a fifth vibration amplitude threshold; the first value, the second value and the third value decrease in sequence; the third vibration amplitude threshold, the fourth vibration amplitude threshold and the fifth vibration amplitude threshold increase in sequence.

[0150] S4: Control the wind turbine generator set to alarm and enter safety mode.

[0151] It should be noted that the safety mode is reduced capacity operation or shutdown.

[0152] Example 3

[0153] Corresponding to the above-mentioned embodiment of the monitoring method of the wind turbine generator set, the present disclosure also provides an embodiment of a monitoring system of the wind turbine generator set, and the monitoring system of the wind turbine generator set is used to implement the monitoring method of the wind turbine generator set provided by any of the above-mentioned embodiments. The wind turbine generator set includes a generator, a nacelle, a wind rotor blade and a specific component; the specific component is used to drive the generator to generate electricity; the monitoring system includes:

[0154] An acquisition module 51 is used to acquire a monitoring signal of a wind turbine generator set;

[0155] A first response module 52, in response to the monitoring signal being a speed signal of the generator, extracting a first target signal from the speed signal, and determining the vibration amplitude of the specific component according to the first target signal, the first target signal including a characteristic frequency of the specific component;

[0156] The second response module 53 extracts a second target signal from the vibration acceleration signal in response to the monitoring signal being a vibration acceleration signal of the cabin, and determines the vibration amplitude of the cabin based on the second target signal.

[0157] Optionally, the first response module 52 includes:

[0158] The first extraction unit inputs the rotation speed signal into a first filter, wherein the center frequency and damping parameter of the first filter match the characteristic frequency of the specific component to extract a first target signal matching the characteristic frequency.

[0159] Optionally, the specific component includes a blade of a wind turbine generator set and / or a transmission chain of the wind turbine generator set; the characteristic frequency corresponding to the first target signal includes at least one of an in-plane characteristic frequency of the blade, a rotation frequency of the blade, and a characteristic frequency of the transmission chain; wherein the rotation frequency of the blade is a frequency of the blade rotating n times, and n is a positive integer; the first response module 52 includes:

[0160] The second extraction unit is used to filter the speed signal for each characteristic frequency through a first filter matching the characteristic frequency to extract the corresponding first target signal, and the center frequency and damping parameter of the first filter match the characteristic frequency of the first target signal.

[0161] Optionally, the first response module 52 further includes:

[0162] A calculation unit, used for calculating the root mean square of the amplitude of the first target signal to obtain a first amplitude fluctuation amount;

[0163] The first determining unit is used to determine the vibration amplitude of the specific component according to the first amplitude fluctuation amount, wherein the magnitude of the first amplitude fluctuation amount is positively correlated with the vibration amplitude.

[0164] Optionally, the second response module 53 includes:

[0165] The processing unit is used to input the vibration acceleration signal into the second filter with different sliding average time for filtering processing, so as to obtain the second target signal corresponding to the second amplitude fluctuation and each sliding average time; wherein the second amplitude fluctuation is negatively correlated with the size of the sliding average time.

[0166] Optionally, the second response module 53 further includes:

[0167] The second determining unit is used to determine the vibration amplitude of the nacelle according to the second amplitude fluctuation amount; wherein the second amplitude fluctuation amount is positively correlated with the vibration amplitude.

[0168] Example 4

[0169] Corresponding to the above-mentioned control method embodiment of the wind turbine generator set, the present disclosure also provides an embodiment of a control system of the wind turbine generator set. The control system of the wind turbine generator set is used to implement the control method of the wind turbine generator set provided in any of the above-mentioned embodiments, and the control system includes:

[0170] The determination module 61 is used to determine the vibration amplitude of the specific component and / or the nacelle according to the monitoring method of the wind turbine generator set provided in any of the above embodiments.

[0171] The execution module 62 is used to execute a control strategy matching the vibration amplitude on the wind turbine generator set according to the vibration amplitude. Optionally, the execution module 62 includes:

[0172] The first response unit controls the wind turbine to alarm and enter a safety mode in response to the vibration amplitude of the specific component satisfying a first preset condition; wherein the first preset condition includes at least one of the following: the vibration amplitude of the specific component is greater than or equal to a first vibration amplitude threshold and lasts for a first time interval, and the vibration amplitude of the specific component is greater than or equal to a second vibration amplitude threshold and lasts for a second time interval; wherein the safety mode includes shutdown or reduced capacity operation; the first vibration amplitude threshold is greater than the second vibration amplitude threshold; the first time interval is less than the second time interval.

[0173] Optionally, the execution module 62 includes:

[0174] A second response unit, in response to the sliding average time and the vibration amplitude of the nacelle satisfying a second preset condition, controls the wind turbine generator set to alarm and controls the wind turbine generator set to enter a safety mode; wherein the safety mode includes shutdown or reduced capacity operation;

[0175] The second preset condition includes at least one of the following:

[0176] The sliding average time is a first value and the vibration amplitude of the nacelle is greater than or equal to a third vibration amplitude threshold;

[0177] The sliding average time is a second value and the vibration amplitude of the nacelle is greater than or equal to a fourth vibration amplitude threshold;

[0178] The sliding average time is a third value and the vibration amplitude of the nacelle is greater than or equal to a fifth vibration amplitude threshold;

[0179] The first value, the second value and the third value decrease in sequence;

[0180] The third vibration amplitude threshold, the fourth vibration amplitude threshold, and the fifth vibration amplitude threshold increase in sequence.

[0181] Optionally, the execution module 62 further includes:

[0182] The third response unit, in response to the wind turbine generator set entering the safety mode for a target time period, determines whether to control the wind turbine generator set to exit the safety mode according to the vibration amplitude.

[0183] As for the system embodiment, since it basically corresponds to the method embodiment, the relevant parts can refer to the partial description of the method embodiment. The system embodiment described above is only illustrative, wherein the units described as separate components may or may not be physically separated, and the components as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the disclosed solution.

[0184] Although the specific embodiments of the present disclosure are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present disclosure is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present disclosure, but these changes and modifications all fall within the protection scope of the present disclosure.

Claims

1. A monitoring method for a wind turbine generator set, characterized in that: The wind turbine generator set includes a generator, a nacelle and a specific component; the specific component is used to drive the generator to generate electricity; the monitoring method includes: Acquiring a monitoring signal of the wind turbine generator set; In response to the monitoring signal being a rotation speed signal of the generator, extracting a first target signal from the rotation speed signal, and determining the vibration amplitude of the specific component according to the first target signal, wherein the first target signal includes a characteristic frequency of the specific component; In response to the monitoring signal being a vibration acceleration signal of the nacelle, a second target signal is extracted from the vibration acceleration signal, and a vibration amplitude of the nacelle is determined based on the second target signal.

2. The monitoring method according to claim 1, characterized in that: The extracting the first target signal from the rotation speed signal comprises: The rotation speed signal is input into a first filter, and the center frequency and damping parameter of the first filter are matched with the characteristic frequency of the specific component to extract a first target signal matching the characteristic frequency.

3. The monitoring method according to claim 1, characterized in that: The specific components include blades of the wind turbine generator set and / or a transmission chain of the wind turbine generator set; the characteristic frequency corresponding to the first target signal includes at least one of an in-plane characteristic frequency of the blade, a rotation frequency of the blade, and a characteristic frequency of the transmission chain; The extracting the first target signal from the rotation speed signal comprises: For each characteristic frequency, the rotation speed signal is filtered by a first filter matching the characteristic frequency to extract a corresponding first target signal, wherein the center frequency and damping parameter of the first filter match the characteristic frequency of the first target signal.

4. The monitoring method according to claim 1, characterized in that: The step of determining the vibration amplitude of the specific component according to the first target signal comprises: Calculating a root mean square of the amplitude of the first target signal to obtain a first amplitude fluctuation amount; The vibration amplitude of the specific component is determined according to the first amplitude fluctuation amount, wherein the magnitude of the first amplitude fluctuation amount is positively correlated with the vibration amplitude.

5. The monitoring method according to claim 1, characterized in that: The extracting the second target signal from the vibration acceleration comprises: The vibration acceleration signal is respectively input into the second filter with different sliding average time for filtering processing to obtain the second target signal corresponding to the second amplitude fluctuation and each sliding average time; wherein the second amplitude fluctuation is negatively correlated with the size of the sliding average time.

6. The monitoring method according to claim 5, characterized in that: The determining the vibration amplitude of the nacelle based on the second target signal comprises: The vibration amplitude of the nacelle is determined according to the second amplitude fluctuation amount; wherein the second amplitude fluctuation amount is positively correlated with the vibration amplitude.

7. A control method for a wind turbine generator set, characterized in that: The control method comprises: Determine the vibration amplitude of the specific component and / or the nacelle according to the monitoring method of the wind turbine generator set according to any one of claims 1 to 6; According to the vibration amplitude, a control strategy matching the vibration amplitude is executed on the wind turbine generator set.

8. The control method as claimed in claim 7, characterized in that: The step of executing a control strategy matching the vibration amplitude on the wind turbine generator set according to the vibration amplitude includes: In response to the vibration amplitude of the specific component satisfying a first preset condition, the wind turbine generator set is controlled to alarm and enter a safety mode; wherein the first preset condition includes at least one of the following: the vibration amplitude of the specific component is greater than or equal to a first vibration amplitude threshold and lasts for a first time interval, the vibration amplitude of the specific component is greater than or equal to a second vibration amplitude threshold and lasts for a second time interval; wherein the safety mode includes shutdown or reduced capacity operation; the first vibration amplitude threshold is greater than the second vibration amplitude threshold; the first time interval is less than the second time interval.

9. The control method as claimed in claim 7, characterized in that: The step of executing a control strategy matching the vibration amplitude on the wind turbine generator set according to the vibration amplitude includes: In response to the sliding average time and the vibration amplitude of the nacelle satisfying a second preset condition, the wind turbine generator set is controlled to alarm and enter a safety mode; wherein the safety mode includes shutdown or reduced capacity operation; The second preset condition includes at least one of the following: The sliding average time is a first value and the vibration amplitude of the nacelle is greater than or equal to a third vibration amplitude threshold; The sliding average time is a second value and the vibration amplitude of the nacelle is greater than or equal to a fourth vibration amplitude threshold; The sliding average time is a third value and the vibration amplitude of the nacelle is greater than or equal to a fifth vibration amplitude threshold; The first value, the second value and the third value decrease in sequence; The third vibration amplitude threshold, the fourth vibration amplitude threshold, and the fifth vibration amplitude threshold increase in sequence.

10. The control method as claimed in claim 7, characterized in that: The step of executing a control strategy matching the vibration amplitude on the wind turbine generator set according to the vibration amplitude includes: In response to the wind turbine generator set entering the safety mode for a target time period, it is determined whether to control the wind turbine generator set to exit the safety mode according to the vibration amplitude.

11. A monitoring system for a wind turbine generator set, characterized in that: The wind turbine generator set includes a generator, a nacelle and specific components; the specific components are used to drive the generator to generate electricity; the monitoring system includes: An acquisition module, used for acquiring a monitoring signal of the wind turbine generator set; a first response module, in response to the monitoring signal being a rotation speed signal of the generator, extracting a first target signal from the rotation speed signal, and determining the vibration amplitude of the specific component according to the first target signal, wherein the first target signal includes a characteristic frequency of the specific component; The second response module extracts a second target signal from the vibration acceleration signal in response to the monitoring signal being a vibration acceleration signal of the nacelle, and determines the vibration amplitude of the nacelle based on the second target signal.

12. A control system for a wind turbine generator set, characterized in that: The control system comprises: A determination module, configured to determine the vibration amplitude of the specific component and / or the nacelle according to the monitoring method for a wind turbine generator set according to any one of claims 1 to 6; An execution module is used to execute a control strategy matching the vibration amplitude on the wind turbine generator set according to the vibration amplitude.

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