CN102937526B - The measurement mechanism of blower fan load, system and blower fan control system - Google Patents

Abstract

The invention discloses a fan load measuring device, system and fan control system. The device for measuring the fan load includes: a force measuring ring and at least two measuring sensors, the force measuring ring is arranged at the disconnected section of the measured part of the fan, and the measuring sensor is arranged on the force measuring ring; The measurement sensor is used to measure a measurement signal, which is used to generate a load. In the present invention, since the measuring sensor is arranged on the force measuring ring instead of being directly pasted on the fan, the measuring device can complete the loading calibration in the laboratory without the need for on-site loading calibration, which improves the accuracy of the loading calibration , thereby improving the measurement accuracy of the load.

Description

Measuring device, system for wind turbine load and wind turbine control system

technical field

The invention relates to the technical field of wind power generation, in particular to a wind turbine load measuring device, system and wind turbine control system.

Background technique

The load of the blade root section of the wind turbine (hereinafter referred to as: wind turbine) and the flange section of the tower is an important basis for its design and certification, and is used to evaluate the long-term service safety, fault prediction and diagnosis of the wind turbine. Due to the complexity of the fan system, the unpredictability of the external environment, and the possible flaws and uncertainties in the simulation analysis model, it is necessary to verify the load through testing. The IEC61400-13 standard clearly stipulates the content of the load test. Due to the huge load on the blade root section of the fan and the flange sections of the tower, there is no mature and accurate special testing technology. At present, Wintest and Moog use resistance strain gauges and optical fiber strain sensors to measure the load respectively. Both the resistance strain gauges and the optical fiber strain sensors can be evenly distributed along the axial direction at 90° at a distance of 1.5m from the root of the blade or on the inner wall surface of the tower, so that The loads on the blade root and tower are measured.

Fig. 7 is a schematic diagram of the application of the resistance strain gauge in the prior art, and Fig. 8 is a cross-sectional view of BB in Fig. 7, as shown in Fig. 7 and Fig. 8, the resistance strain gauges R1, R2, R3 are pasted on the inner wall of the tested part 12 and R4, R1, R2, R3 and R4 are respectively located at quarters of the circumference of the tested part 12, and R1, R2, R3 and R4 are stuck on the inner wall of the tested part 12 along the axial direction. The measured component 12 may be a blade or a tower. When the measured component 12 is a blade, the resistance strain gauge may be pasted on the root of the blade. It should be noted that in order to clearly express the structure of the resistance strain gauge in Figure 7, in addition to drawing R3 pasted on the inner wall, the plane structure diagram of R3 is also drawn at the same time, that is, the label R3 in Figure 7 Refers to the graph. Figure 9 is a schematic diagram of the load measurement of the resistance strain gauge in Figure 7 through the full bridge or the half bridge, as shown in Figure 9, if the load is measured through the full bridge, the load function is If measured through the half bridge, the load function is Among them, ΔU _o is the output signal of the resistance strain gauge, U _i is the input signal of the resistance strain gauge, k is the sensitivity coefficient of the strain gauge in the resistance strain gauge, r is the distance between the strain measurement point and the center of the circle, and E is the distance of the measured part The elastic modulus of the material, W is the flexural section modulus of the measured section. Since the load acting on the measurement section can be decomposed into M _x and M _y along the X-axis and Y-axis of the coordinate system, i=x, y in the above load function. Then in the above load function, the coefficient C _i may include C _x and C _y , and M _i may include M _x and M _y . On the premise that ΔU _o and C _i are known, the load M _i can be calculated through the load function, where ΔU _o is obtained by measuring the resistance strain gauge, while C _x and C _y need to be obtained by on-site loading calibration.

In the prior art, the load of the wind turbine can also be measured through the optical fiber strain sensor. Optical fiber strain sensors can be roughly divided into distributed optical fiber strain sensors and multi-point optical fiber strain sensors. The test accuracy of multi-point optical fiber strain sensors is significantly higher than that of distributed optical fiber strain sensors. Therefore, multi-point optical fiber strain sensors are usually used in fan load measurement. The fiber optic strain sensor measures the strain at the measuring point and deduces the load from the strain. A typical multi-point optical fiber strain sensor is a fiber Bragg grating (Fiber Bragg Grating, hereinafter referred to as: FBG) structure. The fiber optic strain sensor can reflect light of a specific wavelength and pass light of other wavelengths. When the fiber optic strain sensor is partially strained, the period, that is, the wavelength, also changes. The reflected wavelength is proportional to the strain, that is, it can be calculated by measuring the change in wavelength. strain size. Fig. 10 is a schematic diagram of the application of an optical fiber strain sensor in the prior art, and Fig. 11 is a CC sectional view in Fig. 9, as shown in Figs. FBG1 , FBG2 , FBG3 and FBG4 are respectively located at quarters of the circumference of the tested part 12 , and FBG1 , FBG2 , FBG3 and FBG4 are pasted on the inner wall of the tested part 12 along the axial direction. It should be noted that in order to clearly express the structure of the optical fiber strain sensor in Figure 10, in addition to drawing the FBG3 pasted on the inner wall, the planar structure diagram of FBG3 is also drawn at the same time, that is, the label FBG3 in Figure 10 Refers to the graph. Then the load function of the load measured by the optical fiber strain sensor is Mi=Ci _FBG ·Δλi, where Δλi is the wavelength change value of the FBG output, and C _iFBG is the bending moment coefficient. Since the load acting on the measurement section can be decomposed into M _x and M _y along the X-axis and Y-axis of the coordinate system, i=x, y in the above load function. Then in the above load function, the coefficient Ci _FBG includes Cx _FBG and Cy _FBG , and M _i may include M _x and M _y . Under the premise of known Δλi and Ci _FBG , the load M _i can be calculated through the load function, where Δλi is obtained by FBG measurement, while Cx _FBG and Cy _FBG need to be obtained by on-site loading calibration.

The current on-site loading calibration methods can include gravity calibration or external load calibration. Gravity calibration is to use the change of the center position of the fan components to realize the bending moment loading of the resistance strain gauge, but because the quality of the components and the position of the center of gravity are difficult to accurately measure, the calibration accuracy is poor (greater than 10%); external load calibration requires a large-tonnage crane It is very difficult and risky to construct the connection device with the load, and the cost is high, the efficiency is low, and the loading direction is difficult to control accurately.

To sum up, no matter in the prior art, the resistance strain gauge or the fiber optic strain sensor is used to measure the wind turbine load, the resistance strain gauge and the fiber optic strain sensor are all directly pasted on the fan on site, and the resistance strain gauge and the fiber optic strain sensor need to be checked on site. For calibration, due to the limitations of on-site technical conditions, it is difficult to accurately control the loading direction and size during the loading calibration process, so the accuracy of loading calibration is low, which leads to large errors in the coefficients obtained through on-site loading calibration, resulting in The load accuracy is low, thereby reducing the measurement accuracy of the load.

Contents of the invention

The invention provides a fan load measuring device, a system and a fan control system, which are used to improve the measurement accuracy of the load.

To achieve the above object, the present invention provides a device for measuring the load of a fan, comprising: a force-measuring ring and at least two measuring sensors, the force-measuring ring is arranged at the disconnected cross-section of the measured part of the fan, and the measuring sensor set on the force measuring ring;

The measurement sensor is used to measure a measurement signal, and the measurement signal is used to generate a load.

Optionally, the shape of the force measuring ring is the same as that of the component under test.

Optionally, the force-measuring ring is connected to the component under test through a fixed connection, wherein the fixed connection includes flange bolts, welding, riveting, bonding or concrete connection.

Optionally, the measuring sensor is arranged on the inner wall of the force measuring ring.

Optionally, the number of the measurement sensors is four, and the four measurement sensors are respectively located at quarters of the circumference of the force-measuring ring.

Optionally, the measurement sensor includes a sensor sensitive element, a first sensor connection end and a second sensor connection end, the sensor sensitive element is located between the first sensor connection end and the second sensor connection end and respectively Connected with the first sensor connection end and the second sensor connection end, the force measuring ring is provided with a first force measurement ring connection end and a second force measurement ring connection end, and the first force measurement ring connection end It is connected with the connecting end of the first sensor, and the connecting end of the second force measuring ring is connected with the connecting end of the second sensor.

Optionally, the center of the sensor sensitive element is located on the test section, a certain section of the connecting end of the first sensor is located on the first end surface section, and a certain section of the second sensor connecting end is located on the second end surface section, The first end-face section and the second end-face section are located on two sides of the test section and opposite to each other.

Optionally, the measurement signal includes: a displacement signal or a load signal.

Optionally, the component under test includes a blade or a tower.

In order to achieve the above object, the present invention also provides a measurement system for fan load, including: a measurement device for fan load and a data processing module, and the measurement device for fan load includes: a force-measuring ring and at least two measurement sensors, so The force-measuring ring is arranged on the measured part of the fan, and the measurement sensor is arranged on the force-measuring ring;

The measurement sensor is used to measure a measurement signal and output the measurement signal to the data processing module;

The data processing module is configured to generate a load according to the measurement signal.

To achieve the above object, the present invention also provides a fan control system, including: a fan load measurement system and a main controller, the fan load measurement system includes a fan load measurement device and a data processing module;

The wind turbine load measuring device is used to measure a measurement signal and output the measurement signal to the data processing module;

The data processing module is configured to generate a load according to the measurement signal, and output the load to the main controller;

The main controller is used to control the fan according to the load.

Optionally, the wind turbine control system further includes a state monitoring module, the wind turbine load measurement system further includes a data interface, and the state monitoring module is connected to the data processing module through the data interface;

The data processing module is also used to output the load to the state monitoring module through the data interface;

The condition monitoring module is used to monitor the fan according to the load.

The present invention has the following beneficial effects:

In the technical solution provided by the present invention, the measuring device for the fan load includes a force measuring ring and a measuring sensor, the force measuring ring is arranged at the disconnected cross-section of the measured part of the fan, and the measuring sensor is arranged on the force measuring ring to measure the measurement signal, The measurement signal is used to generate the load. In the present invention, since the measurement sensor is arranged on the force measuring ring instead of being directly pasted on the fan, the measurement device can complete the loading calibration in the laboratory instead of on-site loading calibration. The accuracy of load calibration is improved, thereby improving the accuracy of load measurement.

Description of drawings

Fig. 1 is a structural schematic diagram of a fan load measuring device provided by Embodiment 1 of the present invention;

Fig. 2 is A-A direction sectional view in Fig. 1;

Fig. 3 is the schematic plan view of bending measuring sensor in the present embodiment;

Figure 4a is a schematic plan view of the curved measuring sensor in this embodiment;

Fig. 4b is a schematic diagram of deformation of the bending measuring sensor in Fig. 4a;

5 is a schematic structural diagram of a fan load measuring device provided in Embodiment 2 of the present invention;

FIG. 6 is a schematic structural diagram of a fan control system provided in Embodiment 4 of the present invention;

Fig. 7 is the application schematic diagram of resistance strain gauge in the prior art;

Fig. 8 is a B-B sectional view in Fig. 7;

Fig. 9 is a schematic diagram of load measurement performed by the resistance strain gauge in Fig. 7 through a full bridge or a half bridge;

Fig. 10 is a schematic diagram of the application of the optical fiber strain sensor in the prior art;

Fig. 11 is a sectional view along line C-C in Fig. 10 .

Detailed ways

In order to enable those skilled in the art to better understand the technical solution of the present invention, the fan load measurement device, system and fan control system provided by the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a structural schematic diagram of a fan load measuring device provided by Embodiment 1 of the present invention, Fig. 2 is a sectional view along A-A in Fig. 1, and Fig. 3 is a schematic diagram of the application of the fan load in Fig. 1, as shown in Fig. 1, Fig. 2 and As shown in Fig. 3, the measuring device of the fan load comprises: a force-measuring ring 5 and at least two measuring sensors, the force-measuring ring 5 is arranged on the broken section of the measured part 15 of the fan, and the measuring sensor is arranged on the force-measuring ring 5 superior. The measuring sensor is used to measure out a measuring signal which can be used to generate a load.

Specifically, the measurement signal can be output to the data processing module for the data processing module to generate a load according to the measurement signal.

When it is necessary to measure the load on a certain section of the tested component 15, the tested component 15 can be disconnected from the section, and the section where the tested component 15 is disconnected is a broken section, as shown in Figure 3 , the tested component 15 is broken into two parts from the broken section, and the force measuring ring 5 is arranged between the two parts of the tested component 15 which are disconnected, that is, the force measuring ring 5 is set at the broken part of the tested component 15 open section. Wherein, the breaking section may be any section of the component under test 15 . When the force-measuring ring 5 is arranged on the cut-off section of the tested component 15 , it can simultaneously connect the two disconnected parts of the tested component 15 , so that the force-measuring ring 5 becomes an integral part of the tested component 15 . The force measuring ring 5 is connected to the component under test 15 through a fixed connection, wherein the fixed connection includes welding, riveting, bonding or concrete connection. In other words, the force measuring ring 5 and the component under test 15 can be connected by welding, riveting, bonding or concrete connection. The above welding methods, riveting methods, bonding methods and concrete connection methods are all fixed connection methods, so that the force measuring ring 5 can be firmly and reliably arranged on the component under test. In the above connection methods, both the riveting method and the bonding method are detachable connection methods, so that the force measuring ring 5 can be easily disassembled.

The shape of the force-measuring ring 5 is the same as that of the component under test 15, in other words, the shape of the force-measuring ring 5 matches the shape of the component under test 15, so that the force-measuring ring 5 can be installed on the broken part of the component under test 15. open section. For example: when the tested part 15 is a cylindrical structure, that is to say, when the cross section of the tested part 15 is circular, in order to match the shape of the tested part 15, the force-measuring ring 5 can be a ring, so that the force-measuring ring 5 has the same shape as the measured component 15 , so that the force measuring ring 5 has the same shape as the measured component 15 . And the size of the section of the force measuring ring 5 matches the size of the broken section of the measured component 15 , so that the force measuring ring 5 can be more accurately installed at the broken section of the tested component 15 . Wherein, the component under test 15 may include a blade or a tower. When the load of the blade needs to be measured, the force measuring ring 5 can be installed at the broken section of the blade; when the load of the tower needs to be measured, the force measuring ring 5 can be installed at the broken section of the tower.

The measurement sensor can be arranged on the inner wall or the outer wall of the force measuring ring 5 . In this embodiment, preferably, the measuring sensor is arranged on the inner wall of the force measuring ring 5 . As shown in FIG. 2 , the number of measuring sensors is preferably four, and the four measuring sensors are respectively located at quarters of the circumference of the force measuring ring 5 . Wherein, four measuring sensors are respectively measuring sensor 1, measuring sensor 2, measuring sensor 3 and measuring sensor 4, and measuring sensor 1, measuring sensor 2, measuring sensor 3 and measuring sensor 4 are respectively located on the fourth class of force measuring ring 5 circumference. Sub-office. In order to clearly show the positions of the four measurement sensors, a coordinate system is drawn in Fig. 2, wherein the coordinate origin 0 of the X-axis and the Y-axis is located at the center of the force measuring ring 5, and the measurement sensor 1 and the measurement sensor 3 are opposite The measurement sensor 2 and the measurement sensor 4 are arranged opposite and both are located on the Y axis. In practical applications, the number of measuring sensors is not limited to 4, and other arbitrary numbers greater than 2 can also be used. The position of the measuring sensors on the force measuring ring 5 can also be set arbitrarily, and can be set in a uniform or non-uniform manner. On the force measuring ring 5. Preferably, the measuring sensor and the force measuring ring need to meet the requirements of accurate positioning and the principle of interchangeable assembly between the measuring sensors, so that the measuring sensor can decompose, decouple and accurately measure the load along the X-axis and Y-axis of the coordinate system.

The specific structure of the measuring sensor and the connection method between the measuring sensor and the force measuring ring will be described in detail below by taking the measuring sensor 1 as an example. Measuring sensor 1 comprises sensor sensitive element 6, first sensor connecting end 7 and second sensor connecting end 8, and sensor sensitive element 6 is positioned between the first sensor connecting end 7 and the second sensor connecting end 8 and sensor sensitive element 6 is connected with respectively The first sensor connection 7 is connected to the second sensor connection 8 . The force measuring ring 5 is provided with a first force measuring ring connecting end 9 and a second force measuring ring connecting end 10, preferably, the first force measuring ring connecting end 9, the second force measuring ring connecting end 10 and the force measuring ring 5 One piece. In FIGS. 1 to 3 , the connecting end 9 of the first force-measuring ring and the connecting end 10 of the second force-measuring ring are both arranged on the inner wall of the force-measuring ring 5 . In practical application, if the measurement sensor can be arranged on the outer wall of the force measuring ring 5, the connecting end 9 of the first force measuring ring and the connecting end 10 of the second force measuring ring are both arranged on the outer wall of the force measuring ring 5. The situation is no longer drawn in detail. The connecting end 9 of the first force-measuring ring is connected to the connecting end 7 of the first sensor, and the connecting end 10 of the second force-measuring ring is connected to the connecting end 8 of the second sensor. In this embodiment, the connecting end 9 of the first force-measuring ring and the connecting end 7 of the first sensor can be mechanically fixedly connected by machining, specifically, the connecting end 9 of the first force-measuring ring and the connecting end 7 of the first sensor can be The positioning is performed by an accurate positioning device and the detachable fixed connection is carried out by means of bolt connection or riveting; the connection end 10 of the second force measuring ring and the connection end 8 of the second sensor can be connected by means of a mechanical fixed connection, specifically, the first The connecting end 10 of the second force measuring ring and the connecting end 8 of the second sensor can be positioned by a precise positioning device and detachably fixedly connected by means of bolt connection or riveting. Optionally, the first force-measuring ring connection end 9 and the first sensor connection end 7 can also be connected through reliable connection methods such as welding or bonding, and the second force-measuring ring connection end 10 and the second sensor connection end 8 can be connected by Reliable connection methods such as welding or bonding are used for connection. In this embodiment, the specific structures of the remaining measurement sensors and the connection methods between the measurement sensors and the force-measuring ring are the same as those of the measurement sensor 1, and will not be described here one by one. Wherein, when the first force-measuring ring connecting end 9 and the first sensor connecting end 7 are connected through a detachable fixed connection, and the second force-measuring ring connecting end 10 and the second sensor connecting end 8 are connected through a detachable fixed connection When connected in the same way, when there is a problem with the measuring sensor installed on the force measuring ring 5, the measuring sensor can be easily replaced without replacing the entire measuring device.

As shown in Figures 1 and 3, the center of the sensor sensitive element 6 is located on the test section, a certain section of the first sensor connection end 7 is located on the first end face section, and a certain section of the second sensor connection end 8 is located on the first end surface section. On the two end-face sections, the first end-face section and the second end-face section are located on both sides of the test section and oppositely arranged. In this embodiment, the force measuring ring 5 can transmit the load of the component under test 15, and the measuring sensor can obtain a measuring signal by measuring the relative displacement change between the first end face section and the second end face section, in other words, the measuring sensor can pass through The measurement signal is obtained by measuring the relative displacement change between the first sensor connection end 7 and the second sensor connection end 8 . In this embodiment, the measurement signal may include: a displacement signal or a load signal.

During the measurement process of the measurement sensor, the sensor sensitive element 6 in the measurement sensor will be deformed, and the deformation way includes tension and compression, bending, torsion or any combination thereof. Correspondingly, according to different deformation modes of the sensor sensitive element 6 , the measurement sensor may include a tension-compression measurement sensor, a bending measurement sensor or a torsion measurement sensor. If the measurement signal is a displacement signal, the measurement sensor can measure displacement or deformation; if the measurement signal is a load signal, the measurement sensor can measure loads such as tension and compression, bending or torsion. The deformation process of the measuring sensor will be described in detail below by taking the bending measuring sensor as an example with reference to FIGS. 4a and 4b. Fig. 4a is a schematic plan view of the bending measuring sensor in this embodiment, and Fig. 4b is a schematic deformation diagram of the bending measuring sensor in Fig. 4a. As shown in FIG. 4a, there is no relative displacement change between the first sensor connection end 7 and the second sensor connection end 8, so the sensor sensitive element 6 is not deformed. As shown in FIG. 4 b , a relative displacement change occurs between the first sensor connection end 7 and the second sensor connection end 8 , so the sensor sensitive element 6 undergoes bending deformation.

In this embodiment, the data processing module may be the original data processing module in the wind turbine, or may be a data processing module separately set up to realize the function of measuring the load. After the data processing module receives the measurement signal output by the measurement sensor, it can calculate and process the measurement signal to generate a load. The loads may include: X-axis loads and Y-axis loads. According to the principle of orthogonal force, the load M _xy acting on the measured part can be decomposed into X-axis load M _x and Y-axis load M _y along the coordinate system (refer to GL specification), M _y = M _xy sinθ, M _x =M _xy ·cosθ, where θ is the angle between the bending moment direction and the X axis.

Specifically, the data processing module can calculate and process the measurement signal according to the load function formula to generate the load. Taking the measuring device of the fan load in this embodiment including four measuring sensors as an example, the load function formula can be:

$\left(\begin{array}{c}{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; x</span>}}\\ {\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}\end{array}\right)<span\; class="notranslate">\; \&Proportional;</span>\left(\begin{array}{c}{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}\\ {\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\end{array}\right)<span\; class="notranslate">\; \&Proportional;</span>\left(\begin{array}{c}{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}\\ {\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\end{array}\right)<span\; class="notranslate">\; \&Proportional;</span>\left(\begin{array}{c}{\mathrm{<span\; class="notranslate">\; Sen</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Sen</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}\\ {\mathrm{<span\; class="notranslate">\; Sen</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Sen</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\end{array}\right)<span\; class="notranslate">\; \&Proportional;</span>\left(\begin{array}{c}{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; out</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}\mathrm{<span\; class="notranslate">\; out</span>}}\\ {\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}\mathrm{<span\; class="notranslate">\; out</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; out</span>}}\end{array}\right)<span\; class="notranslate">\; =</span>\left(\begin{array}{c}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; out</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}\mathrm{<span\; class="notranslate">\; out</span>}}<span\; class="notranslate">\; )</span>\\ {\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; the\; y</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}\mathrm{<span\; class="notranslate">\; out</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; out</span>}}<span\; class="notranslate">\; )</span>\end{array}\right)$

, where the stress on the inner wall of the load cell 5 close to where the measuring sensor is located D _o is the outer diameter of the force-measuring ring 5, D _i is the inner diameter of the force-measuring ring 5, and E is the elastic modulus of the force-measuring ring material; wherein, the deformation of the measuring sensor δ _i =L· _εi ·m, (i =1, 2, 3, 4), L is the distance between the first end face section and the second end face section, and m is the deformation correction constant, which is related to deterministic factors such as measuring sensor stiffness and connection stiffness; where , U _iout is the output signal of the measuring sensor, sen _i is the physical variable of the sensor sensitive element, (i=1, 2, 3, 4), when U _iout is obtained, it can be calculated by the following formula U _iout = k · Sen _i sen _i , where k is the sensitivity coefficient of the sensor; kx and ky are coefficient functions, which can be obtained through laboratory loading and calibration in advance. In this embodiment, the physical variables of the sensitive elements of the sensor may include strain, displacement, or piezoelectricity.

In this embodiment, after receiving the measurement signal, the data processing module needs to perform analog-to-digital conversion on the measurement signal first, convert the analog measurement signal into a digital measurement signal, and then process the measurement signal to generate a load.

Furthermore, the data processing module can also output the generated load to the main controller of the wind turbine, and the main controller controls the wind turbine according to the load, wherein the control of the wind turbine may specifically include independent pitch control and safety control. The load generated by the data processing module is a digital signal. Before the load is output to the main controller, it is necessary to perform digital-to-analog conversion on the load, convert the digital load into an analog load, and then output the simulated load to the main controller.

Furthermore, the data processing module can also output the load to the status monitoring module of the wind turbine through the data interface, and the status detection module can monitor the wind turbine according to the load, wherein the monitoring of the wind turbine can specifically include monitoring the load and life of the wind turbine.

The measuring device for the fan load provided by this embodiment includes a force measuring ring and a measuring sensor, the force measuring ring is arranged at the disconnected cross-section of the measured part of the fan, and the measuring sensor is arranged on the force measuring ring and measures a measurement signal. The signal is used to generate the load. In this embodiment, since the measuring sensor is set on the force measuring ring instead of being directly pasted on the fan, the measuring device can complete the loading calibration in the laboratory instead of on-site loading calibration, improving The accuracy of the load calibration is improved, thereby improving the measurement accuracy of the load. The force measuring ring is responsible for transmitting the load of the fan, and the measuring sensor is responsible for measuring the deformation, so that the measuring device of this embodiment realizes the separation of bearing and measurement. Both the accuracy of the measuring sensor and the accuracy of the loading calibration in this embodiment can reach 0.1%, so that a higher accuracy of the measuring sensor and loading calibration can be obtained through the solution of this embodiment. The measurement accuracy of the load in this embodiment can reach 1% to 3%, which is greatly improved compared with the 20% measurement accuracy of the load in the prior art. The measuring sensor is directly installed on the force measuring ring without on-site pasting and on-site calibration. The installation is simple and quick, the installation cycle is short, the on-site assembly is easy, and the assembly efficiency and assembly quality are high. The measurement sensors meet the requirements of interchangeable assembly. If a measurement sensor fails, only the measurement sensor needs to be replaced, without the need to replace the entire measurement device, and there is no need for on-site calibration of the newly replaced measurement sensor, thereby reducing the cost of the measurement device. The low cost and the reduced maintenance difficulty of the measuring device make the measuring device easy to maintain. In this embodiment, the measuring sensor and the force-measuring ring can be connected through a mechanical connection, which ensures the firmness between the measuring sensor and the force-measuring ring, and avoids the drift of the measuring sensor, so that the measuring device can be used in harsh field environments. to obtain accurate measurement results. In this embodiment, the replacement process of the measurement sensor is relatively simple, so the replacement of the measurement sensor does not require professionals to come to the site. In this embodiment, the measuring device has better working stability, so the load measured by the measuring device can be used to control the fan and monitor the status of the fan.

Fig. 5 is a schematic structural diagram of a fan load measuring device provided by Embodiment 2 of the present invention. As shown in Fig. 5 , the difference between this embodiment and the above-mentioned Embodiment 1 is that the force measuring ring 5 and the measured Components (not specifically shown in the figure) are connected by means of flange bolts, and the fan load measurement device also includes a flange 11, which is connected to the measured component. Specifically, both ends of the force measuring ring 5 are provided with protruding parts 12, and at least one flange screw hole 13 is provided on the flange 11, and a protruding part corresponding to the flange screw hole 13 is provided on the protruding part 12. screw holes 14, the number of screw holes 14 on the protruding part is the same as the number of screw holes 13 on the flange, install the bolts into the screw holes 13 on the flange and the screw holes 14 on the protruding part to connect the flange 11 to the force measuring ring 5 , so that the force measuring ring 5 is connected to the component under test 15 through the flange 11 .

In this embodiment, the force-measuring ring is connected to the component under test through a flange, so that the force-measuring ring can be firmly and reliably fixed on the inner wall of the component under test, and the force-measuring ring can be easily disassembled by using the flange connection.

Embodiment 3 of the present invention also provides a fan load measurement system, the measurement system includes: a fan load measurement device and a data processing module, the fan load measurement device includes: a force measuring ring and at least two measurement sensors, the The force-measuring ring is arranged on the measured part of the fan, and the measurement sensor is arranged on the force-measuring ring. The measurement sensor is used to measure a measurement signal and output the measurement signal to the data processing module; the data processing module is used to generate a load according to the measurement signal.

Wherein, the device for measuring the load of the fan may adopt the device for measuring the load of the fan provided in the first embodiment or the second embodiment above, which will not be repeated here.

FIG. 6 is a schematic structural diagram of a fan control system provided by Embodiment 4 of the present invention. As shown in FIG. 6 , the fan control system includes: a fan load measurement system 101 and a main controller 102 . The wind turbine load measurement system 101 may include: a wind turbine load measurement device 103 and a data processing module 104 . The measuring device 103 of the fan load is used to measure the measurement signal, and output the measurement signal to the data processing module 104; the data processing module 104 is used to generate the load according to the measurement signal, and output the load to the main controller 102; the main controller 102 is used to control the fan according to the load. Wherein, controlling the wind turbine may specifically include: performing independent pitch control and safety control on the wind turbine.

In this embodiment, after receiving the measurement signal, the data processing module 104 needs to perform analog-to-digital conversion on the measurement signal first, convert the analog measurement signal into a digital measurement signal, and then process the measurement signal to generate a payload. The load generated by the data processing module 104 is a digital signal, and before the load is output to the main controller 102, it is necessary to perform digital-to-analog conversion on the load, convert the digital load into an analog load, and then output the simulated load to the main controller 102.

In this embodiment, the device for measuring the load of the fan may adopt the device for measuring the load of the fan provided in the first or second embodiment above, and details will not be repeated here.

Further, the wind turbine control system may also include a status monitoring module 105, and the wind turbine load measurement system may also include a data interface 106, and the status monitoring module 105 is connected to the data processing module 104 through the data interface 106. The data processing module 104 is also used to output the load to the status monitoring module 105 through the data interface 106; the status monitoring module 105 is used to monitor the fan according to the load. Wherein, monitoring the fan may include monitoring the load and service life of the fan.

It can be understood that, the above embodiments are only exemplary embodiments adopted for illustrating the principle of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims (12)

1. A measuring device for fan load, characterized in that it comprises: a force measuring ring and at least two measuring sensors, the force measuring ring is arranged at the disconnected section of the measured part of the fan, and the measuring sensor is arranged at on the force measuring ring; The measurement sensor is used to measure a measurement signal, and the measurement signal is used to generate a load. 2 . The wind turbine load measuring device according to claim 1 , wherein the shape of the force-measuring ring is the same as that of the component under test. 3 . 3. The device for measuring the load of a fan according to claim 1, wherein the force measuring ring is connected to the measured component through a fixed connection, wherein the fixed connection includes flange bolts, welding, Riveting, bonding or concrete connection. 4. The device for measuring the load of a fan according to claim 1, wherein the measuring sensor is arranged on the inner wall of the force measuring ring. 5 . The wind turbine load measuring device according to claim 4 , wherein the number of the measuring sensors is four, and the four measuring sensors are respectively located at quarters of the circumference of the force-measuring ring. 6 . 6. The device for measuring fan load according to claim 4, wherein the measuring sensor comprises a sensor sensitive element, a first sensor connecting end and a second sensor connecting end, and the sensor sensitive element is located at the first Between the sensor connection end and the second sensor connection end and respectively connected to the first sensor connection end and the second sensor connection end, the force measuring ring is provided with a first force measuring ring connection end and a second sensor connection end. The connecting end of the force-measuring ring, the connecting end of the first force-measuring ring is connected to the connecting end of the first sensor, and the connecting end of the second force-measuring ring is connected to the connecting end of the second sensor. 7. The device for measuring fan load according to claim 6, wherein the center of the sensitive element of the sensor is located on the test section, a certain section of the connecting end of the first sensor is located on the first end surface section, the A certain section of the second sensor connection end is located on the second end surface section, and the first end surface section and the second end surface section are located on two sides of the test section and are oppositely arranged. 8. The device for measuring fan load according to claim 1, wherein the measurement signal comprises: a displacement signal or a load signal. 9. The wind turbine load measuring device according to any one of claims 1 to 8, wherein the measured component includes a blade or a tower. 10. A measurement system for fan load, characterized in that it includes: a measurement device for fan load and a data processing module, and the measurement device for fan load includes: a force-measuring ring and at least two measuring sensors, and the force-measuring ring It is arranged on the broken section of the measured part of the fan, and the measuring sensor is arranged on the force measuring ring; The measurement sensor is used to measure a measurement signal and output the measurement signal to the data processing module; The data processing module is configured to generate a load according to the measurement signal. 11. A fan control system, characterized in that it comprises: a fan load measurement system and a main controller, the fan load measurement system includes a fan load measurement device and a data processing module, wherein the fan load measurement device adopts A measuring device for any fan load in claims 1-9; The wind turbine load measuring device is used to measure a measurement signal and output the measurement signal to the data processing module; The data processing module is configured to generate a load according to the measurement signal, and output the load to the main controller; The main controller is used to control the fan according to the load. 12. The wind turbine control system according to claim 11, characterized in that, the wind turbine control system further includes a state monitoring module, and the wind turbine load measurement system further includes a data interface, and the state monitoring module communicates with the wind turbine through the data interface The data processing module is connected; The data processing module is further configured to output the load to the state monitoring module through the data interface; The condition monitoring module is used to monitor the fan according to the load.