JP6567909B2 - Wind power generator and wireless communication method in wind power generator - Google Patents

Description

  The present invention relates to a wind turbine generator having a wireless sensor network and a wireless communication method in the wind turbine generator.

  A wind power generator using wireless technology is disclosed in Patent Document 1. Patent document 1 states, “In the wind turbine generator according to the present embodiment, at least one of a signal transmitted from the strain gauge to the vibration calculating unit and a signal transmitted from the noise sensor to the vibration state adjusting unit is wirelessly used. In this way, by using wireless technology, a sensor network can be easily constructed even with a large-scale wind power generator. "

JP2013-231409A

  The wind power generator is installed in an area where stable wind power can be obtained. In other words, the area where the wind turbine generator is installed is limited by the surrounding terrain (or the terrain of the surrounding land when installed on the sea). It is necessary to install a plurality of wind power generators in a limited area to increase the installation space efficiency. Moreover, in order to grasp | ascertain the state of the braid | blade of a wind power generator, a wireless communication is used in order to transmit / receive sensor data etc. between the transmitter / receiver provided in the blade and the nacelle.

  Even when a plurality of wind turbine generators are installed in a limited area, it is difficult to use a frequency band (channel) different from that of an adjacent wind turbine generator for wireless communication. This is because if the frequency band is different, it is necessary to adjust a filter or the like for each frequency band to be used. In addition, it is difficult to use a plurality of frequency bands for a wind power generator in a certain area from the viewpoint of effective use of frequencies. When radio waves in the same frequency band are used for a plurality of different radio communications, interference occurs between the radio waves. In Patent Document 1, no consideration is given to radio wave interference of a wireless sensor network.

  In such a situation, when wireless communication is used between a sensor node including a sensor provided on a blade of a wind turbine generator and a sink node including a transmitter / receiver provided in a nacelle or the like, wireless communication between adjacent wind generators and Interference occurs between the two.

  The disclosed wind turbine generator transmits a signal via the first antenna and receives sensor data in synchronization with the rotational position of the blade within a predetermined angle (± α degrees) with respect to the vertical direction. A nacelle having a node and a nacelle provided with a sensor node for transmitting sensor data via the second antenna in response to reception of a signal from the first antenna via the second antenna It has a blade that is rotated by a rotor.

  According to the disclosed wind turbine generator, it is possible to reduce the occurrence of radio wave interference with the wireless communication between adjacent wind turbine generators.

It is a front view of the structural example of a wind power generator. It is a side view of the structural example of a wind power generator. It is a figure explaining interference with the radio wave from the sensor node of an adjacent wind power generator. 1 is a configuration example of a wireless sensor network system. It is a structural example of a sensor node. It is a wireless communication sequence diagram between a sink node and a sensor node. It is an example of composition of a sink node and a blade which are some wind power generators. It is a wind power generator using a directional antenna as a sink node.

  Hereinafter, examples will be described with reference to the drawings.

  FIG. 1 is a front view of a configuration example of a wind power generator (a view of a rotating surface of each blade of the wind power generator viewed from the front). FIG. 2 is a side view of a configuration example of the wind turbine generator of FIG.

  The wind turbine generator includes three blades of a blade A101, a blade B102, and a blade C103, a nacelle 108, a tower 109, and a hub 110. Although the configuration example in FIG. 1 shows three blades, one blade may be used. From the mechanical balance of a wind power generator, it is usually two or more.

  The hub 110 is a rotating part called a rotor in which three blades A to C (101 to 103) are fixed at intervals of 120 degrees. The blades A to C (101 to 103) receive wind and rotate in the blade rotation direction shown in FIG. 1, whereby the rotation shaft of the hub 110 rotates, and the generator is connected to the generator via the transmission connected to the rotation shaft. Rotational motion is transmitted to generate electricity. The rotating shaft of the hub 110 is fixed to the nacelle 108 by a bearing, and the transmission and the generator are built in the nacelle 108.

  In the wind turbine generator, sensor nodes A to C (105 to 107) having sensors for measuring a state such as blade strain are installed in the blades A to C (101 to 103). The sensor is, for example, a strain gauge in the case of strain measurement. A sink node 104 provided in the nacelle 108 receives sensor data from the sensor nodes A to C (105 to 107). The sensor nodes A to C (105 to 107) and the sink node 104 constitute a wireless sensor network.

  As shown in FIG. 1, the sink node 104 and the sensor nodes A to C (105 to 107) each have an omnidirectional antenna having a circular radiation pattern. The communication range between the sink node 104 and each of the sensor nodes A to C (105 to 107) is such that the antenna of each of the sensor nodes A to C (105 to 107) is within the range of the radiation pattern of the antenna of the sink node 104. Yes, when the antenna of the sink node 104 is within the range of the radiation pattern of the antennas of the sensor nodes A to C (105 to 107). The frequency bands used by the sensor nodes A to C (105 to 107) for wireless communication are the same.

  FIG. 3 is a diagram for explaining interference with radio waves from sensor nodes of adjacent wind turbine generators. In general, wind turbine generators are installed at an interval that is not affected by the turbulence caused by the rotation of blades of adjacent wind turbine generators. The interval is about 2 to 10 times the diameter of the rotating circle drawn by the tip of the blade.

  On the other hand, in order to ensure wireless communication between the sink node and each sensor node (to ensure a signal-to-noise ratio where the data error rate is equal to or lower than a predetermined value (specification value)), communication is performed as described above. The wireless communication line is designed to include the other party (sink node and sensor node) in the radiation pattern of each antenna. When the installation interval of wind power generators is narrow, radiation patterns between sensor nodes overlap as shown by hatching in the figure, interference occurs in radio waves radiated from sensor nodes, and errors occur in the data being conveyed . Although the interference radio wave attenuates, it causes noise at the sink node. Further, the radio wave radiated from the sensor node of the wind power generator A close to the wind power generator B in the figure (in the direction from the sink node of the wind power generator A to the sink node of the wind power generator B) Even if radio waves are not radiated from the sensor node and radio wave interference does not occur, it becomes a noise factor in the sink node of the wind turbine generator B.

  Therefore, it is necessary to control the radio waves radiated from each sensor node so as not to cause an interference region (so as to suppress the radio wave interference so as not to affect the wireless communication). What is necessary is just to control so that an electromagnetic wave is not radiated | emitted in the direction of an interference area | region.

  As shown in the figure, the radius of the radiation pattern of each antenna is r. Also, let D be the interval between the wind power generator A and the wind power generator B. In the figure, a straight line that passes through the sink node in the nacelle of the wind power generator A and circumscribes the radiation pattern of the sensor node of the wind power generator B is L, and its outer contact is M.

  If the angle between the straight line L and the vertical direction of the sink node of the wind turbine generator A is α, the straight line connecting the sensor node of the wind turbine generator B and the external contact M, the sensor node of the wind turbine generator B, and the wind generator A It is obtained as the angle formed by the straight line connecting the sink nodes. Since the sink node of the wind power generator A, the sensor node of the wind power generator B, and the outer contact M form a right triangle as shown in the figure, α = arccos α≈arccos {r / (D−r)}.

  As described above, the radio wave radiated from each sensor node is controlled to be radiated in a range of less than ± α degrees with respect to the vertical direction of the sink node.

  FIG. 4 is a configuration example of a wireless sensor network system including the sink node 104 and sensor nodes A to C (105 to 107). The wireless sensor network system includes a server 201, a control device 202, and a blade position detection device 203 in addition to the sink node 104 and sensor nodes A to C (105 to 107).

  The server 201 collects sensor data from the sensor nodes A to C (105 to 107) received by the sink node 104 via the control device 202. The server 201 may be provided in a place different from the wind power generator, and may correspond to a plurality of wind power generators and collect sensor data thereof.

  The control device 202 controls wireless communication between the sink node 104 and each of the sensor nodes A to C (105 to 107) based on the blade position information (rotation angle information) from the blade position detection device 203. The sensor data received by 104 is output to the server 201.

  The blade position detection device 203 detects the rotation angle of the hub 110 with respect to the nacelle 108 and outputs it to the control device 202. As for the rotation angle, it is only necessary to know the position of each of the sensor nodes A to C (105 to 107), and a reference angle with the rotation angle of the hub 110 being 0 can be arbitrarily determined. Here, the sensor node A105 is a nacelle. Description will be made assuming that the reference angle is directly above 108 (vertical direction). Therefore, when the sensor node B 106 is directly above the nacelle 108 (vertical direction), the rotation angle of the hub 110 is 120 degrees. In other words, when the rotation angle of the hub 110 is 120 degrees, the sensor node B106 is directly above the nacelle 108 (vertical direction). Similarly, when the rotation angle of the hub 110 is 240 degrees, the sensor node C107 is directly above the nacelle 108 (vertical direction).

  The sink node 104 is controlled by the control device 202 and includes a transmission / reception unit 1041 and an antenna 1042 for wireless communication with the sensor nodes A to C (105 to 107). As described above, the antenna 1042 is an omnidirectional antenna.

  FIG. 5 shows a configuration example of the sensor node A 105 (the other sensor nodes have the same configuration, and therefore the sensor node A 105 is represented). The sensor node A 105 is connected to a duplexer 302 and a duplexer 302 that separates an antenna 301 and a reception wave from the antenna 301 and a transmission wave to the antenna 301 for sharing the antenna 301 for transmission and reception. Received data including an ID for identifying the sensor node A105 is extracted from the wave, and connected to the receiving unit 303 and the duplexer 302 via SW1. The transmitting unit 304 and the receiving unit 303 output the transmitted wave carrying the transmitted data. , Connected to the transmission unit 304 and the sensor unit 308 such as a strain gauge, the control unit 305 for controlling the connection of SW1 to SW2, and connected to the transmission unit 304 via SW2, and connected to the sensor unit 308 via SW3. A buffer P306 and a buffer Q307 to be connected are connected.

  A transmission wave from the transmission unit 304 is radiated from the antenna 301 when SW1 is turned on by the control unit 305, and is not radiated when SW1 is turned off. In the replacement buffer, the control unit 305 performs reversible control of SW2 and SW3 (when SW2 is connected to p, SW3 is connected to q, and when SW2 is connected to q, SW3 is connected to p. ), When the contents (sensor data) of one buffer are transmitted as transmission data, the sensor data from the sensor unit 308 is stored in the other buffer.

  The storage of the sensor data in the buffer is repeated regardless of the transmission time and transmission time of the transmission data based on an output instruction from the control unit 305 to the sensor unit 308. Output instructions from the control unit 305 to the sensor unit 308 are output from the control unit 305 at intervals of 100 ms, for example.

  The rotational speed of the blade of the wind power generator is 10 to 50 revolutions / minute, although it varies depending on the model. In order to examine the time allowed for the transmission time of the transmission data, the rotation speed is set to 60 rotations / minute (1 rotation / second), which is a higher speed rotation. The aforementioned angle α is 60 ° when D = 3r, but α = 45 ° so that interference can be further suppressed. Therefore, under these severe conditions, the time allowed for the transmission time is 45 degrees × 2/360 degrees / 1 rotation / second = 250 ms. On the other hand, if the output of sensor data from the sensor unit 308 is 10 Bytes / time at 100 ms intervals, 1 Byte per rotation (one second) of the blade. Taking into account the amount of data in the header part (sensor node ID, etc.) for transmitting this sensor data for each rotation of the blade and the time for establishing and shutting down the wireless line, the data amount is 10 times equivalent. Assuming that it is equal to transmitting, 10 kByte × 8/250 ms = 320 kBPS. Compared to the recent high-speed communication speed using radio, the communication speed is an order of magnitude, which can be easily realized.

  FIG. 6 is a wireless communication sequence diagram between the sink node 104 and the sensor nodes A to C (105 to 107) when the blade of the wind turbine generator rotates once. The wireless communication sequence will be described with reference to FIG. 4 and FIG.

  The control device 202 connected to the sink node 104 is based on the position (predetermined angle) information that the blade A101 from the blade position detection device 203 is above the sink node 104 (−45 degrees in the above numerical example). The beacon signal including the ID (identifier) of the sensor node A 105 is transmitted via the transmission / reception unit 1041. The sensor node A 105 detects a match between the ID stored in the reception unit 303 (ID of the sensor node A 105) and the ID included in the beacon signal, and outputs a transmission start to the control unit 305. In response to the transmission start input, the control unit 305 turns on SW1 to return the transmission unit 304 so that a transmission wave can be output (transmission unit return, transmission unit activation), and ACK to the transmission unit 304 (Acknowledgment to reception of beacon signal including ID) is instructed to be transmitted. In addition, the control unit 305 controls SW2 and SW3 in a reciprocal manner as described above to replace the buffer P306 and the buffer Q307. By changing the buffer, the sensor data from the sensor unit 308 is stored in the buffer connected by SW3.

  In response to the reception of the ACK from the sensor node A 105, the transmission / reception unit 1041 of the sink node 104 transmits a data transmission request including the ID of the sensor node A 105. The receiving unit 303 of the sensor node A 105 detects a match between the ID stored in the receiving unit 303 and the ID included in the data transmission request, and outputs the data transmission request to the control unit 305. In response to the input of the data transmission request, the control unit 305 instructs the transmission unit 304 to transmit the contents (sensor data) of one of the replacement buffers connected via SW2. The transmission unit 304 notifies the control unit 305 of the completion of transmission when the transmission of the buffer contents is completed. In response to the notification of transmission completion, the control unit 305 turns off SW1 so that no transmission wave is output from the transmission unit 304 (transmission unit sleep, transmission unit inactivation).

  Regarding the sensor node B106 and the sensor node C107, the timing at which the sink node 104 transmits a beacon signal is synchronized with the position of the blade, that is, the blade B102 is above the sink node 104 (in the above numerical example, −45 degrees, the reference angle Is based on the position (predetermined angle) information that is at 120 degrees -45 degrees = 75 degrees and the blade C103 is above the sink node 104 (in the above numerical example, based on the reference angle of -45 degrees). The operation is the same except that it is based on the position (predetermined angle) information that is at 240 degrees-45 degrees = 195 degrees), and the description thereof is omitted.

  Since the beacon signal and the data transmission request are received by each of the sensor nodes A to C (105 to 107), the sensor node ID is used to identify the sensor node to be transmitted and received.

  According to the present embodiment, in synchronization with the blade position information, the sensor node within a predetermined angle above the nacelle wirelessly communicates with the sink node. Can be suppressed.

  A present Example is a wind power generator which provided the some sensor node in each of blade AC of the wind power generator of Example 1 (101-103). In the first embodiment, a strain gauge is illustrated as a sensor. However, the sensor is a sensor node that measures physical quantities and chemical quantities such as temperature, humidity, pressure, sound, acceleration, angular velocity, flow rate and flow rate of liquid and gas, and component analysis. It may be. In order to monitor the state of the blade and the peripheral state of the blade, the sink node 104 and each of the sensor nodes A to C (105 to 105) of the wind power generation apparatus in which a plurality of sensors among such various sensors are provided on each blade. 107) will be described.

  FIG. 7 is a configuration example of the sink node 104 and the blade A101 provided in the nacelle 108, which are a part of the wind turbine generator (blade B102 and blade C103 are not shown). The blade A101 is provided with sensor nodes A1 to A5 (1051 to 1055). Therefore, the difference from the first embodiment is that the number of sensor nodes is plural. The IDs for identifying the sensor nodes A1 to A5 (1051 to 1055) are different.

  When a plurality of sensor nodes are provided as described above, the timing at which each sensor node starts the transmission / reception operation of sensor data may be controlled by one of the following methods (1) to (3). As shown in the figure, the number of sensor nodes is assumed to be 5.

  (1) The first is a method of controlling the start of transmission / reception operations of the sensor nodes A1 to A5 (1051 to 1055) based on position (predetermined angle) information as in the first embodiment. This method is a method in which the sink node 104 transmits a beacon signal based on blade position (predetermined angle) information for each of the sensor nodes A1 to A5 (1051 to 1055). The transmission / reception order of the sensor nodes may be determined, and the sink node 104 may transmit a beacon signal to the sensor nodes in the first order, and a sensor data transmission request may be transmitted after the second.

  As in the numerical example described in the first embodiment, regarding the sensor nodes A1 to A5 (1051 to 1055) provided in the blade A101, if wireless communication is performed in a blade position range (90 degrees) from −45 degrees to +45 degrees. Good. Accordingly, the blade position range allowed for each of the sensor nodes A1 to A5 (1051 to 1055) is 90 degrees / 5 = 18 degrees. As described in (2), when the data amount of sensor data is the same, the communication speed is required to be five times higher than that in the first embodiment.

  (2) The second is a method of shifting the start of transmission / reception operations of the sensor nodes A1 to A5 (1051 to 1055) by a predetermined time. In the numerical example of the first embodiment, the communication time allowed for the sensor node provided in the blade A101 is 250 ms. Therefore, the start of transmission / reception operation of each of the sensor nodes A1 to A5 (1051 to 1055) may be shifted by 250 ms / 5 = 50 ms, and the allowable communication time may be 50 ms. The communication speed is 320 kBPS × 5 = 1600 kBPS = 1.6 MBPS, which is five times the numerical example of the first embodiment. For shifting the predetermined time, the timing at which the sink node 104 transmits the beacon signal may be shifted, or the transmission / reception order of the sensor nodes is determined, and each sensor node A1 to A5 is determined according to the transmission / reception order from the reception time of the beacon signal. The transmission / reception start time of (1051 to 1055) is delayed by a predetermined time. In this case, the sensor node that transmits / receives first starts transmission / reception in response to the reception of the beacon signal in the same manner as in the first embodiment, but the second and later sets a predetermined delay time in response to reception of the beacon signal. A timer is started, and transmission / reception is started after a predetermined delay time has elapsed.

  (3) A third method is to determine the transmission / reception order of the sensor nodes and start transmission / reception in response to the completion of transmission / reception of the sensor nodes in the previous order. The detection of the completion of transmission / reception of the sensor node in the previous order may be detected by the sensor node monitoring the completion of transmission / reception, or the sensor node in the previous order may transmit the ID of the sensor node, and the sensor node may receive it. . However, in this case, it is necessary to receive a plurality of channels (frequencies) using a selector or the like in the duplexer 302 and the reception unit 303 and receive transmission waves from other sensor nodes.

  According to this embodiment, the sensor node within a predetermined angle with respect to the vertical direction above the nacelle communicates with the sink node in synchronization with the position information of the blade (or a delay time equivalent to the position information). Even if the sensor node is provided on the blade, radio wave interference does not occur between the adjacent wind power generators.

  FIG. 8 shows a wind power generator using a directional antenna as the antenna 1042 of the sink node 104 provided in the nacelle 108. Let the half-value angle of this directional antenna be β. As described in the first embodiment, wireless communication between the sink node 104 and the sensor nodes A to C (105 to 107) provided in each of the blades 101 to 103 is performed by the blades A to C (101 to 103). Therefore, the angle range for wireless communication also depends on the position information of the blades A to C (101 to 103). In the numerical example of the first embodiment, the angle range of wireless communication of the sensor node A105 is 90 degrees from −45 degrees to +45 degrees of the blade A101. Therefore, if the radiation direction of the antenna 1042 of the sink node 104 is set directly above the vertical direction (vertical direction) of the antenna 1042 of the sink node 104 and the half-value angle β = 90 degrees, it matches the angle range of the numerical example of the first embodiment. .

  When a directional antenna with a half-value angle β (= α × 2) is used for the antenna 1042 of the sink node 104 in this way, in the wind turbine generator in which one sensor node is provided on the blade as in the first embodiment, the sensor node is Since reception of radio waves from the sink node 104 can be replaced with reception of a beacon signal, the sink node 104 can omit transmission of a beacon signal including the ID of the sensor node based on blade position information. Since the other sensor nodes do not receive the radio wave from the sink node 104, the sensor node to be transmitted / received is specified without using the sensor node ID.

  Note that, in the wind turbine generator having a plurality of sensor nodes on the blade as in the second embodiment, it is necessary to specify each of the plurality of sensor nodes. The transmission request needs to include the sensor node ID.

  As a modification of the present embodiment, illustration is omitted, but the following configuration may be used. This is a wind power generator in which three antennas having directivity in the direction of each blade A to C (101 to 103) are provided on the hub 110 on the sink node 104. A difference from the wind turbine generator of FIG. 8 is that an antenna is provided on the rotating hub 110. With this difference, the control device 202 switches the three antennas based on the position information of the blade provided with the sensor node that the sink node 104 transmits and receives. In addition, since the antenna is provided on the hub 110 that rotates, a brush-type contact or the like is used for connection with the transmission / reception unit 1041 in the nacelle 108. Except for the difference from the wind turbine generator of FIG. 8, the antenna of the sink node 104 faces the antenna of the sensor node, so the configuration and operation are the same.

  Although not shown, this embodiment is a wind power generator that uses a directional antenna whose radiation direction is in the direction of the sink node 104 as the antenna of the sensor node. Even if the antenna of the sensor node continues to emit radio waves (the sensor node does not continue to emit radio waves because the transmitter 304 is controlled to return / sleep), it has directivity in the direction of the sink node 104. In FIG. 3, the interference area indicated by hatching does not occur. Strictly speaking, interference due to the side lobe of the antenna of the sensor node occurs, but the radiated power is smaller than the main lobe in the radiation direction of the directional antenna, and the radiated power of the radio wave that caused the interference is also small. Has little effect on wireless communication with sensor nodes.

  As a modification of the present embodiment, there is a wind turbine generator that combines a case where a directional antenna is used for the sink node 104 of the third embodiment. That is, the wind turbine generator uses directional antennas for both the sink node 104 antenna and the sensor node antenna. The configuration and operation of this modification are a combination of the third embodiment and the present embodiment, and the advantages and disadvantages thereof are also combined.

  According to the wind turbine generator of the embodiment described above, even if wireless communication is used between the sensor node provided in the blade and the sink node provided in the nacelle or the like, the wireless communication between adjacent wind generators Radio wave interference can be suppressed.

  101-103: Blade, 104: Sink node, 105-107: Sensor node, 108: Nacelle, 109: Tower, 110: Hub, 201: Server, 202: Control device, 203: Blade position detection device, 301: Antenna, 302: duplexer, 303: receiving unit, 304: transmitting unit, 305: control unit, 306 to 307: buffer, 308: sensor unit, 1041: transmitting / receiving unit, 1042: antenna, 1051 to 1055: sensor node.

Claims (8)

A wind power generator having a hub, a plurality of blades fixed to the hub, a nacelle including a generator driven by rotation of the hub, and a tower that supports the nacelle,
The nacelle is synchronized with the rotational position within a predetermined angle degrees relative to the vertical direction of the blade, and transmitting a signal over a first antenna, have a sink node receiving the sensor data,
The blades, in response to receiving the signal from the first antenna via a second antenna, have a sensor nodes for transmitting the sensor data via the second antenna,
The signal transmitted by the sink node includes an ID for identifying the sensor node;
In response to the detection of the ID, the sensor node activates a transmission unit that transmits the sensor data, and the rotation position of the blade is in response to the completion of the transmission of the sensor data within the predetermined angle. A wind power generator characterized in that the transmitter is inactivated . The blade is provided with a plurality of sensor nodes, and the plurality of sensor nodes complete the transmission of the sensor data within a predetermined angle of the rotation position of the blade according to a predetermined transmission order for each of the plurality of sensor nodes. The wind power generator according to claim 1. The plurality of sensor nodes transmit the sensor data in synchronization with a rotational position of the blade obtained by equally dividing the predetermined angle by the number of the plurality of sensor nodes according to the transmission order. 2. The wind power generator according to 2 . The blade is provided with a plurality of the sensor nodes, and the plurality of sensor nodes set the rotation time of the predetermined angle of the blade by the number of the plurality of sensor nodes according to a predetermined transmission order of the plurality of sensor nodes. in synchronization with the rotation period obtained by equally dividing, wind power generator according to claim 1, characterized in that transmitting the sensor data. The wind power generator according to claim 1 , wherein the first antenna is a directional antenna having a half-value angle of the predetermined angle . Said first antenna, wind turbine generator according to claim 5, characterized in that the have a directivity in a direction of said sensor nodes provided in the blade. The wind turbine generator according to claim 5, wherein the second antenna is a directional antenna having directivity in the direction of the sink node . In a wind turbine generator having a hub, a plurality of blades fixed to the hub and having a sensor node, and a nacelle having a generator and a sink node driven by rotation of the hub, between the sink node and the sensor node Wireless communication method,
The sink node transmits a signal via the first antenna in synchronization with a rotational position within a predetermined angle with respect to the vertical direction of the blade,
The sensor node transmits sensor data via the second antenna in response to receiving the signal from the first antenna via the second antenna;
The sink node receives the sensor data via the first antenna;
The signal transmitted by the sink node includes an ID for identifying the sensor node;
In response to the detection of the ID, the sensor node activates a transmission unit that transmits the sensor data, and the rotation position of the blade is in response to the completion of the transmission of the sensor data within the predetermined angle. A wireless communication method in a wind turbine generator, wherein the transmitter is inactivated .

Images