Detection system and wind turbine

Abstract

A detection system comprises a plurality of passive wireless sensors (1), which are respectively arranged at corresponding positions to be detected and used to obtain detection signals of the positions to be detected; a leakage coaxial cable (2), which is arranged along the positions to be detected and can emit electromagnetic waves to drive the plurality of passive wireless sensors, and receive detection signals sent by the passive wireless sensors. The detection system can save installation frames, and does not require regular replacement of batteries, thus simplifying maintenance costs, reducing costs during multi-point measurement and increasing the number of passive wireless sensors that can be configured in the system. A wind turbine is also disclosed.

Description

Technical Field

[0001] The present disclosure relates to the field of measurement technology, and in particular to a detection system and a wind turbine. Background Art

[0002] Wind turbines are electrical equipment that converts wind energy into mechanical work, which drives the rotor to rotate and finally outputs alternating current. Wind turbines can be composed of static components and dynamic components. Static components can include controllers, nacelles, etc., and dynamic components can include rotating equipment such as bearings, gearboxes, generators, and motors.

[0003] During the operation of a wind turbine, the temperature of each component will change. If the temperature of components such as the gearbox, generator, oil-water cooler, and main shaft exceeds a certain range, it may affect the efficiency of power generation. Therefore, it is very important to monitor and control the temperature of the wind turbine.

[0004] At present, in some scenarios, a separate system is needed to monitor the temperature information of all components in a wind turbine. However, it is easier to monitor the temperature information of static components, but it is more difficult to monitor the temperature information of dynamic components. Wireless temperature measurement is usually used for temperature detection.

[0005] The relevant wireless temperature measurement methods mainly include the following:

[0006] 1) A wireless temperature measurement unit with a battery is used for monitoring and outputting a wireless temperature signal. The wireless temperature measurement unit is powered by its own battery;

[0007] 2) Using a wireless charging temperature measurement unit for monitoring, outputting a wireless temperature signal, and obtaining power from the wireless charging unit;

[0008] 3) Using SAW (surface acoustic wave) temperature sensors or tags for monitoring, charging the SAW temperature sensors or tags through electromagnetic waves, and the SAW temperature sensors or tags output wireless temperature signals through electromagnetic waves.

[0009] The above known methods have the following problems:

[0010] 1) Wireless temperature measurement units with batteries require a large installation space and require regular battery replacement.

[0011] 2) The wireless charging temperature measurement unit also requires a large installation space, and each temperature measurement unit requires a wireless charging unit and a signal processing unit. Therefore, for multi-point measurement, the system will be very large and expensive.

[0012] 3) Although the sensor chip of the SAW temperature sensor is very small and can obtain power from electromagnetic waves, it is very suitable for bearing temperature measurement. However, the distance between the SAW temperature sensor and the antenna is relatively strict (within 2 meters), and the signal is sensitive to the environmental layout. In addition, the driving and signal reading of the SAW temperature sensor are completed one by one through the antenna in a serial communication manner. This means that if there are multiple sensors and one antenna, it takes a relatively long time to drive and read the signal of the SAW temperature sensor, and the number of antennas limits the number of SAW temperature sensors in a system. Summary of the invention

[0013] In view of this, the present disclosure proposes a detection system and a wind turbine generator, which can save installation space, simplify maintenance costs by eliminating the need for regular battery replacement, reduce costs during multi-point measurement, and increase the number of passive wireless sensors that can be configured in the system.

[0014] According to one aspect of the present disclosure, a detection system is provided, the system comprising:

[0015] A plurality of passive wireless sensors, wherein the plurality of passive wireless sensors are respectively arranged at corresponding positions to be detected and are used to obtain detection signals of the positions to be detected;

[0016] A leaky coaxial cable is arranged along the position to be detected, and the leaky coaxial cable can emit electromagnetic waves to drive the plurality of passive wireless sensors, and can receive the detection signals sent by the passive wireless sensors.

[0017] In a possible implementation, the leaky coaxial cable is of a coupled type.

[0018] In a possible implementation manner, the passive wireless sensor is a surface acoustic wave (SAW) sensor.

[0019] In a possible implementation manner, the detection signal includes temperature, and the passive wireless sensor is a SAW temperature sensor.

[0020] In a possible implementation manner, the multiple passive wireless sensors transmit the detection signals in parallel and / or serially.

[0021] In a possible implementation manner, the system includes a plurality of channels corresponding to a plurality of wireless passive sensors, and the plurality of passive wireless sensors send the detection signals through the plurality of channels.

[0022] In a possible implementation manner, some of the multiple passive wireless sensors share one channel to transmit detection signals, and the passive wireless sensors sharing one channel send detection signals in a time division multiplexing manner.

[0023] In a possible implementation manner, the multiple passive wireless sensors are equidistant from the leaky coaxial cable.

[0024] In a possible implementation, the system further includes:

[0025] a base station connected to the first end of the leaky coaxial cable, wherein the leaky coaxial cable transmits the received detection signal to the base station;

[0026] The base station demodulates the detection signal and transmits the demodulated detection signal to the monitoring center.

[0027] In a possible implementation, the system further includes:

[0028] A load is connected to the second end of the leaky coaxial cable.

[0029] In a possible implementation manner, the system further includes: a repeater, wherein the repeater is arranged on the leaky coaxial cable and located between the base station and the load.

[0030] In a possible implementation manner, the system further includes: a power distributor, and the base station is connected to a plurality of leaky coaxial cables through the power distributor.

[0031] In a possible implementation, the system further includes: a DC isolation device,

[0032] The DC isolation device is arranged between the base station and the power distributor,

[0033] One end of the DC isolation device connected to the power distributor is grounded.

[0034] In a possible implementation, the monitoring center is a remote computer, and the detection signal can be viewed through the remote computer.

[0035] According to another aspect of the present disclosure, a wind turbine is provided, comprising the detection system as described above.

[0036] By adopting passive wireless sensors to be set at the position to be detected to obtain the detection signal of the position to be detected, it does not require a large installation space, does not require regular battery replacement, does not require the configuration of multiple wireless charging units and signal processing units, etc., and reduces the cost during multi-point measurement; using leaky coaxial cables to replace traditional antennas is equivalent to setting up multiple antennas without requiring a large installation space, which extends the effective distance of the antenna and increases the number of passive wireless sensors in the system.

[0037] Therefore, the detection system according to the above embodiment of the present disclosure can save installation space, simplify maintenance costs by eliminating the need to regularly replace batteries, reduce costs during multi-point measurements, and increase the number of passive wireless sensors that can be configured in the system.

[0038] Further features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.

[0040] Figure 1 A schematic diagram of a detection system according to an embodiment of the present disclosure is shown.

[0041] Figure 2 A schematic diagram of a detection system according to an embodiment of the present disclosure is shown.

[0042] Figure 3 A schematic diagram of a detection system according to an embodiment of the present disclosure is shown.

[0043] Reference numerals list

[0044] 1. Passive wireless sensor, 2. Leaky coaxial cable, 3. Base station, 4. Load, 5. Power divider, 6. Repeater, 7. Ground, 8. DC isolation device. DETAILED DESCRIPTION

[0045] Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0046] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0047] In addition, in order to better illustrate the present disclosure, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present disclosure can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present disclosure.

[0048] In order to solve the above-mentioned technical problems raised by the present disclosure, the present disclosure provides a detection system that can detect the temperature information of dynamic components in a wind turbine and does not require a large installation space. For multi-point measurement, it can not only reduce costs, but also reduce the sensing time to improve the detection accuracy.

[0049] Figure 1 FIG. 2 is a schematic diagram of a detection system according to an embodiment of the present disclosure. Figure 1 As shown, the system may include:

[0050] A plurality of passive wireless sensors 1, wherein the plurality of passive wireless sensors 1 are respectively arranged at corresponding positions to be detected, and are used to obtain detection signals of the positions to be detected;

[0051] The leakage coaxial cable 2 is arranged along the position to be detected, and the leakage coaxial cable 2 can emit electromagnetic waves to drive the plurality of passive wireless sensors 1 , and can receive the detection signals sent by the passive wireless sensors 1 .

[0052] The passive wireless sensor 1 does not need to be connected to a power source and can be driven by external factors. In one example, the passive wireless sensor 1 of the present disclosure can be a surface acoustic wave (SAW) sensor. It should be noted that other passive wireless sensors 1, such as passive tags, can also be used according to actual measurement needs, and the present disclosure does not limit this.

[0053] The detection signal may include temperature, or may include other signals that need to be detected, such as humidity, pressure, etc. Accordingly, if the detection signal includes temperature, the passive wireless sensor 1 may include a SAW temperature sensor, which is not limited in the present disclosure.

[0054] In one example, the position to be detected may be located on a wind turbine, and the wind turbine may include multiple positions to be detected, such as being located on static components such as a controller and a nacelle, or on dynamic components such as a bearing and a gearbox, which is not limited in the present disclosure. It should be noted that the above are only some examples of the positions to be detected, and the positions to be detected may be selected according to different application scenarios or detection requirement groups.

[0055] The leaky coaxial cable 2 may be provided with a plurality of slots, and electromagnetic waves are transmitted longitudinally in the leaky coaxial cable 2, and electromagnetic waves are radiated to the outside through the slots, and electromagnetic waves from the outside can also be sensed by the slots into the inside of the leaky coaxial cable and transmitted longitudinally. The plurality of slots are equivalent to a plurality of antennas.

[0056] The leakage coaxial cable 2 is arranged along the position to be detected, which may mean that the leakage coaxial cable 2 extends through each position to be detected, or the leakage coaxial cable 2 is laid along the distribution of the position to be detected at a preset distance from the position to be detected. The preset distance may be a distance that can maintain a good communication effect between the passive wireless sensor 1 and the leakage coaxial cable 2, and the preset distance may be a range, which is not limited in the present disclosure.

[0057] In a possible implementation, the distances between the multiple passive wireless sensors 1 and the leaking coaxial cable 2 may be equal, that is, the distance between any passive wireless sensor 1 and the leaking coaxial cable 2 may be a fixed value. The distance between the passive wireless sensor 1 and the leaking coaxial cable 2 may refer to the shortest distance between the passive wireless sensor 1 and the leaking coaxial cable 2. In this way, the communication process may be made more stable.

[0058] It is mentioned above that the passive wireless sensor 1 can be driven by external factors. In the present disclosure, the leaky coaxial cable 2 can emit electromagnetic waves to drive the passive wireless sensor 1. Taking the SAW temperature sensor as an example, the SAW temperature sensor may include a piezoelectric substrate, an interdigital transducer, a reflection grating and an antenna. The antenna can receive the electromagnetic waves emitted by the leaky coaxial cable 2 and transmit them to the interdigital transducer. The interdigital transducer excites the surface acoustic wave through the inverse piezoelectric effect to complete the electrical / acoustic conversion. The surface acoustic wave propagates on the surface of the piezoelectric substrate and is reflected back to the interdigital transducer by the reflection grating. The interdigital transducer converts the reflected surface acoustic wave into an excitation signal through the piezoelectric effect, and transmits the excitation signal to the leaky coaxial cable through the antenna in the form of an electromagnetic wave.

[0059] When the temperature changes, the wavelength and wave velocity of the surface acoustic wave propagating along the surface of the piezoelectric substrate will change accordingly. At this time, the phase and frequency of the excitation signal transmitted through the antenna will change accordingly. By detecting the phase and frequency of the excitation signal, the temperature can be detected.

[0060] By adopting passive wireless sensors to be set at the position to be detected to obtain the detection signal of the position to be detected, it does not require a large installation space, does not require regular battery replacement, does not require the configuration of multiple wireless charging units and signal processing units, etc., and reduces the cost during multi-point measurement; using leaky coaxial cables to replace traditional antennas is equivalent to setting up multiple antennas without requiring a large installation space, which extends the effective distance of the antenna and increases the number of passive wireless sensors in the system.

[0061] Therefore, the detection system according to the above embodiment of the present disclosure can save installation space, simplify maintenance costs by eliminating the need to regularly replace batteries, reduce costs during multi-point measurements, and increase the number of passive wireless sensors that can be configured in the system.

[0062] Figure 2 FIG. 2 is a schematic diagram of a detection system according to an embodiment of the present disclosure. Figure 2 As shown, in a possible implementation, the system may further include:

[0063] A base station 3 is connected to a first end of the leaky coaxial cable 2, and the leaky coaxial cable 2 transmits the received detection signal to the base station 3;

[0064] The base station 3 demodulates the detection signal and transmits the demodulated detection signal to the monitoring center.

[0065] The detection system may further include: a load 4, which may be connected to the second end of the leaky coaxial cable 2. The load 4 may prevent the electromagnetic wave signal emitted by the base station 3 from being reflected to the base station 3 and causing interference.

[0066] Among them, the base station 3 can have communication and data processing functions. As mentioned above, it can emit electromagnetic waves, receive detection signals transmitted by the leaking coaxial cable 2, demodulate the detection signals and transmit them to the monitoring center, etc. The base station 3 and the monitoring center can communicate through a data interface, and the data interface can be RS485 or RJ45. The monitoring center can be a remote computer, and the detection signal can be viewed through the remote computer. For example, the remote computer can include a display device, and the management personnel can also operate through the display device of the remote computer to control the base station 3, and obtain the detection signal of a certain position to be detected that they want to view through the base station 3, thereby reducing the response time.

[0067] In a possible implementation, each passive wireless sensor (SAW temperature sensor) may have a unique RFID (Radio Frequency Identification), and the detection signal and the demodulated detection signal may both carry the RFID of the passive wireless sensor.

[0068] In this embodiment, the plurality of passive wireless sensors may send detection signals in a serial communication manner. For example, the plurality of passive wireless sensors may send detection signals in a time division multiplexing manner, for example, sending detection signals in turn.

[0069] The base station 3 can identify detection signals sent by multiple different passive wireless sensors through RFID. The monitoring center can pre-store the relationship between the RFID of the passive wireless sensor and the position to be detected. The monitoring center can determine the temperature and other information of the position to be detected through the RFID of the passive wireless sensor carried in the demodulated detection signal and the pre-stored relationship between the RFID of the passive wireless sensor and the position to be detected. After determining the temperature and other information of the position to be detected, the remote computer can display the corresponding relationship between the position to be detected and its temperature through a display device.

[0070] In another possible implementation manner, the multiple passive wireless sensors 1 correspond to multiple channels, and the multiple passive wireless sensors 1 send the detection signals through the multiple channels.

[0071] In one example, different operating frequencies can be set for multiple passive wireless sensors 1 in the system. Multiple passive wireless sensors can send detection signals in a parallel communication manner, that is, each passive wireless sensor 1 has its own unique operating frequency, that is, each passive wireless sensor 1 corresponds to a channel, and transmits the detection signal to the base station 3 through the channel. In this way, multiple passive wireless sensors can transmit detection signals at the same time, achieving the detection of multiple signals in a shorter time and improving the efficiency of detection.

[0072] In a possible implementation, the leaky coaxial cable 2 may be a coupled type. The use of a coupled leaky coaxial cable can fully utilize the broadband capacity, thereby achieving communication with more passive wireless sensors.

[0073] In another example, the plurality of passive wireless sensors may transmit the detection signals in parallel and in series.

[0074] For example, some of the multiple passive wireless sensors share a channel to transmit detection signals, and the passive wireless sensors that share a channel can send detection signals in a time division multiplexing manner. For example, the system includes 10 passive wireless sensors, among which the working frequency of 3 passive wireless sensors 11 is frequency 1 (corresponding to channel 1), the working frequency of 4 passive wireless sensors 12 is frequency 2 (corresponding to channel 2), and the working frequencies of the three passive wireless sensors 13, 14 and 15 are frequency 3 (corresponding to channel 3), frequency 4 (corresponding to channel 4) and frequency 5 (corresponding to channel 5). Then, the 3 passive wireless sensors 11 send detection signals through channel 1 in a time division multiplexing manner, the 4 passive wireless sensors 12 send detection signals through channel 2 in a time division multiplexing manner, and the passive wireless sensors 13, 14 and 15 can send detection signals through channels 3, 4 and 5 at the same time.

[0075] In one possible implementation, Figure 2 As shown, the system may further include: a repeater 6, which is arranged on the leaky coaxial cable 2 and located between the base station 3 and the load 4. The repeater 6 is used to enhance the power of the electromagnetic wave transmitted in the leaky coaxial cable 2.

[0076] There is longitudinal attenuation in the transmission process of electromagnetic waves in the leaky coaxial cable 2, and there is coupling loss in the leaky coaxial cable. Therefore, as the transmission distance increases, power attenuation occurs, and the transmission distance of a single leaky coaxial cable is usually less than 400 meters. By setting a repeater on the leaky coaxial cable, the transmission distance can be extended, and when the transmission distance is long, it can still communicate with multiple passive wireless sensors 1.

[0077] In a possible implementation, the system may further include: a power distributor 5 , through which the base station 3 is connected to a plurality of leaky coaxial cables.

[0078] Figure 3 FIG. 2 is a schematic diagram of a detection system according to an embodiment of the present disclosure. Figure 3 As shown, a detection system may include multiple leaky coaxial cables 2, and a first end of each leaky coaxial cable 2 is connected to a power divider 5, and a second end is connected to a load 4. The power divider 5 can divide the energy of one electromagnetic wave emitted by the base station 3 into multiple electromagnetic waves with equal or unequal energy, and output them to the multiple leaky coaxial cables 2 respectively. In a possible implementation, a repeater 6 may also be provided on each leaky coaxial cable 2.

[0079] In a possible implementation, the system may further include: a direct current (DC) isolation device 8,

[0080] The DC isolation device 8 is arranged between the base station 3 and the power distributor 5, and one end of the DC isolation device 8 connected to the power distributor 5 is grounded 7. The DC isolation device can effectively isolate the potential between the input, output, power supply and ground, and protect the safety of the entire system.

[0081] The present disclosure also provides a wind turbine generator, comprising the above detection system, through which the temperature and other information of all equipment in the wind turbine generator can be monitored.

[0082] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A detection system, characterized in that: The system comprises: A plurality of passive wireless sensors (1), wherein the plurality of passive wireless sensors (1) are respectively arranged at corresponding positions to be detected and are used to obtain detection signals of the positions to be detected; a leakage coaxial cable (2), the leakage coaxial cable (2) being arranged along the position to be detected, the leakage coaxial cable (2) being capable of emitting electromagnetic waves to drive the plurality of passive wireless sensors (1), and being capable of receiving the detection signals sent by the passive wireless sensors (1); A base station (3) connected to a first end of the leaky coaxial cable (2), wherein the leaky coaxial cable (2) transmits the received detection signal to the base station (3); and A load (4) connected to the second end of the leaky coaxial cable (2), The base station (3) demodulates the detection signal and transmits the demodulated detection signal to the monitoring center. The plurality of passive wireless sensors (1) are equidistant from the leaking coaxial cable (2). The detection signal includes temperature.

2. The detection system according to claim 1, characterized in that: The leaky coaxial cable (2) is of a coupled type.

3. The detection system according to claim 1, characterized in that: The passive wireless sensor (1) is a surface acoustic wave (SAW) sensor.

4. The detection system according to claim 1, characterized in that: The passive wireless sensor (1) is a SAW temperature sensor.

5. The detection system according to claim 1, characterized in that: The plurality of passive wireless sensors (1) transmit the detection signals in parallel and / or serial manner.

6. The detection system according to claim 5, characterized in that: The plurality of passive wireless sensors (1) correspond to a plurality of channels, and the plurality of passive wireless sensors (1) send the detection signals through the plurality of channels.

7. The detection system according to claim 6, characterized in that: Some of the multiple passive wireless sensors (1) share a channel for transmitting detection signals, and the passive wireless sensors sharing a channel send detection signals in a time division multiplexing manner.

8. The detection system according to claim 1, characterized in that: The system further comprises: a repeater (6), wherein the repeater (6) is arranged on the leaky coaxial cable (2) and is located between the base station (3) and the load (4).

9. The detection system according to claim 8, characterized in that: The system further comprises: a power distributor (5), and the base station (3) is connected to a plurality of leaky coaxial cables (2) via the power distributor (5).

10. The detection system according to claim 9, characterized in that: The system further comprises: a direct current (DC) isolation device (8), The DC isolation device (8) is arranged between the base station (3) and the power distributor (5), One end of the DC isolation device (8) connected to the power distributor (5) is grounded (7).

11. The detection system according to claim 1, characterized in that: The monitoring center is a remote computer, and the detection signal can be viewed through the remote computer.

12. A wind turbine generator, characterized in that: The wind turbine comprises a detection system as claimed in any one of claims 1-11.

Images