JP2015183628A - Condition monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a condition of wind power generator to be appropriately monitored.SOLUTION: This invention relates to a condition monitoring system for monitoring a condition of equipment installed at a wind power generator comprising a wireless measurement unit including sensors arranged in the equipment; and a data collector device for communicating with the wireless measurement unit in a wireless manner. The wireless measurement unit comprises a memory 76 for storing measured data got from the sensors; and a wireless communication part for transmitting the measured data got from the sensors to the data collection device. The data collection device requests re-transmittance of the measured data to the wireless measurement unit when the measured data could not be received from the wireless measurement unit.

Description

  The present invention relates to a state monitoring system, and more particularly to a state monitoring system that monitors the state of a wind turbine generator.

  In a wind power generator, power is generated by rotating a main shaft connected to a blade that receives wind power, rotating the main shaft with a speed increaser, and then rotating a rotor of the power generator. In order to diagnose abnormalities of the main shaft, speed increaser, generator, etc., a technique is known in which vibration is measured using a vibration sensor and the state of the wind power generator is diagnosed from the measured value.

  For example, the “status monitoring system” disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2013-185507) includes a current sensor or a vibration sensor mounted in the nacelle, a monitor device in the nacelle, and a data server. ing. The vibration sensor or current sensor transmits the measurement value to the monitor device by wireless communication, and the monitor device transmits the measurement value from the vibration sensor or current sensor to the data server.

JP 2013-185507 A

  In Patent Document 1, a measurement value of a vibration sensor or a current sensor is wirelessly transmitted, but communication may be interrupted depending on a communication environment such as a radio wave condition. However, since Patent Document 1 does not take measures against the problem, an appropriate diagnosis cannot be made depending on the communication environment.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a state monitoring system capable of appropriately monitoring the state of a wind turbine generator.

  According to one aspect of the present invention, a state monitoring system for monitoring a state of a device provided in a wind turbine generator includes a wireless measurement unit including a sensor provided in the device, and a data collection device that wirelessly communicates with the wireless measurement unit. Prepare.

  The wireless measurement unit includes a memory that stores measurement data acquired from the sensor, and a wireless communication unit that transmits the measurement data acquired from the sensor to the data collection device. When the data collection device cannot receive the measurement data from the wireless measurement unit, the data collection device requests the wireless measurement unit to retransmit the measurement data. The data collection device requests the wireless measurement unit to specify a measurement time interval, divides the measurement data into the designated number of data (blocks), and transmits the data in units of blocks, and the data collection device Judges whether or not all measurement data can be received, and if it cannot be received, requests re-transmission of measurement data after the received block and receives it.

  Preferably, the wireless measurement unit includes a first timer and storage means for storing in the memory measurement data associated with the first time data measured by the first timer in accordance with the measurement order. The retransmission request transmitted by the wireless communication unit includes information specifying the first time data of the measurement data that could not be received.

  Preferably, the data collection device uses the second timer to be timed and the second time data to be timed by the second timer to cause the first timer to time in synchronization with the second timer with respect to the wireless measurement unit. A synchronization processing unit that transmits a time measurement request, a sensor different from the sensor, a data acquisition unit that acquires measurement data from the different sensor provided in the device, and a measurement data acquired by the data acquisition unit It further includes collection storage means for storing the timer in association with the second time data.

  When the data collection device cannot receive all measurement data from the wireless measurement unit, the data collection device reduces the number of data to be transmitted at a time and transmits and receives as one block.

  Preferably, the device includes a bearing that supports a shaft communicating with the windmill, and the bearing has an inner ring through which the shaft passes and an outer ring provided on an outer periphery of the inner ring. One of the inner ring and the outer ring rotates concentrically around the axis in conjunction with the rotation of the windmill, and the other is fixed, and the wireless measurement unit including the sensor is provided on at least one of the inner ring and the outer ring .

  According to the present invention, in wireless communication, when the data collection device cannot receive measurement data from the wireless measurement unit, the data collection device requests the wireless measurement unit to retransmit the measurement data. As a result, measurement data for state monitoring can be acquired without loss.

It is the figure which showed roughly the whole structure of the state monitoring system which concerns on embodiment of this invention. It is the figure which showed schematically the structure of the wind power generator 10 which concerns on embodiment of this invention. It is a figure explaining the attachment aspect of the radio | wireless measurement unit 70 which concerns on this Embodiment. It is a figure explaining the structure and communication aspect of the wireless measurement unit 70 which concern on embodiment of this invention. It is a block diagram which shows an example of a structure of the data collection device 80 which concerns on embodiment of this invention. It is a figure which shows the example of a monitor display which concerns on embodiment of this invention. It is a graph for demonstrating the data measurement and collection synchronized with the driving | running condition which concerns on embodiment of this invention. It is a flowchart which shows the process linked | related with the communication sequence between the radio | wireless measurement unit 70 and the data collection device 80 which concern on embodiment of this invention. It is a figure explaining the attachment aspect of the radio | wireless measurement unit 70 by the 1st modification of embodiment of this invention.

  Hereinafter, the state monitoring system according to the present invention and related portions will be described with reference to the drawings. In the drawings, the same reference numerals represent the same or corresponding parts, and redundant description may not be repeated. It is planned from the beginning to use the structures in the embodiments in appropriate combinations.

<Overall configuration of status monitoring system>
FIG. 1 is a diagram schematically showing the overall configuration of the state monitoring system of the present embodiment. With reference to FIG. 1, the state monitoring system that monitors the operating state of the wind turbine generator 10 includes a data collection device 80 that corresponds to a monitoring data collection device, a data server 330, and a monitoring terminal 340. The data collection device 80, the data server 330, and the monitoring terminal 340 communicate via wired and wireless communication paths including the Internet 320.

  The data collection device 80 communicates wirelessly with a wireless measurement unit 70 described later (FIG. 2). The wireless measurement unit 70 has a vibration sensor 70A connected by a wired cable, and the data collection device 80 has a vibration sensor 70B connected by a wired cable (FIG. 2). As a wireless communication method between the data collection device 80 and the wireless measurement unit 70, a wireless LAN (Local Area Network) can be used.

  A plurality of monitoring terminals 340 corresponding to personal computers (hereinafter also referred to as personal computers) browse the measurement data received by the data server 330 through the Internet 320, perform detailed analysis of the measurement data, and pass through the data server 330. The setting change to the data collection device 80 and the state of each device of the wind turbine generator 10 are displayed. The monitoring terminal 340 includes a fixed terminal and a portable terminal that is a moving body.

  In the present embodiment, since the data collection device 80 and the wireless measurement unit 70 are connected by wireless communication, it is not necessary to wire an expensive sensor cable, and only a necessary power cable is required.

<Configuration of wind turbine generator 10>
FIG. 2 is a diagram schematically illustrating the configuration of the wind turbine generator 10. Referring to FIG. 2, the wind turbine generator 10 includes a main shaft 20, a blade 30, a gear box 40 corresponding to a speed increaser, a generator 50, and a main bearing 60. Furthermore, the wind power generator 10 includes vibration sensors 70A and 70B and a data collection device 80. The gear box 40, the generator 50, the main bearing 60, the sensors 70 </ b> A and 70 </ b> B, and the data collection device 80 are stored in the nacelle 90, and the nacelle 90 is supported by the tower 100.

  The main shaft 20 enters the nacelle 90, is connected to the input shaft of the gear box 40, and is rotatably supported by the main bearing 60. The main shaft 20 transmits the rotational torque generated by the blade 30 corresponding to the windmill receiving the wind force to the input shaft of the gear box 40. The blade 30 is provided at the tip of the main shaft 20 and converts wind force into rotational torque and transmits it to the main shaft 20.

  The main bearing 60 (outer ring, inner ring, rolling element) is fixed in the nacelle 90 and rotatably supports the main shaft 20. The main bearing 60 includes a fixed (non-rotating) inner ring 64 through which the main shaft 20 passes, an outer ring 63 provided around the inner ring 64, and a rolling element 61 (FIG. 3). The rolling element 61 is disposed between the inner ring 64 and the outer ring 63. The outer ring 63 is configured integrally with the main shaft 20 and rotates concentrically around the main shaft 20 in conjunction with the rotation of the main shaft 20. The main bearing 60 is constituted by, for example, a self-aligning roller bearing, a tapered roller bearing, a cylindrical roller bearing, or a ball bearing. These bearings may be single row or double row.

  The vibration sensors 70 </ b> A and 70 </ b> B are fixed to the outer ring on the rotation side of the main bearing when there is no space on the inner ring side and access is difficult and maintenance is difficult. Specifically, the vibration sensors 70A and 70B are fixed to the outer ring of the main bearing 60 in order to monitor the state of the main bearing 60. The mounting position and the number of mounting of the vibration sensors are not limited to these, It may be attached to the yaw or blade 30.

  The gear box 40 is provided between the main shaft 20 and the generator 50, and increases the rotational speed of the main shaft 20 to output to the generator 50. The generator 50 is connected to the output shaft of the gear box 40 and generates electric power by the rotational torque received from the gear box 40. The generator 50 is configured by, for example, an induction generator. The data collection device 80 receives vibration data of each device measured by the vibration sensors 70A and 70B. The vibration sensors 70A and 70B and the data collection device 80 are connected by a wired cable. The data collection device 80 and the antenna 81 + access point 82 are connected by a wireless LAN, and the access point 82 and the data server 330 are connected by a wired or wireless LAN.

  The monitoring terminal 340 stores in advance a program for browsing the received measurement data, performing detailed analysis, and displaying information regarding the state of each device of the wind turbine generator 10. The monitoring terminal 340 displays data on each device of the wind power generator 10 that is useful for a user (expert) of the wind power generator 10 to make a determination. The monitoring terminal 340 receives the measurement data from the data server 330 in which the measurement data measured by the data collection device 80 is stored.

(Mounting mode)
FIG. 3 is a diagram for explaining an attachment mode of the wireless measurement unit 70 according to the present embodiment. Referring to FIG. 3, in the present embodiment, wireless measurement unit 70 and vibration sensor 70 </ b> A are attached to the outer ring 63 side of main bearing 60. In other words, if there is no place for mounting the vibration sensor on the inner ring 64 side of the main bearing 60 or if the vibration sensor cannot be replaced on the inner ring 64 side, the vibration sensor and the wireless measurement unit 70 should be mounted on the rotating outer ring 63 side. Vibration measurement is possible. For example, in an outer ring rotating type wind power generator, the main bearing 60 is configured by inner ring fixing and outer ring rotation, and it may be difficult to attach a vibration sensor to the inner ring side. In such a case, as shown in FIG. 3, the wireless measurement unit 70 and the vibration sensor 70 </ b> A are attached to the outer ring 63 side of the main bearing 60. Here, two vibration sensors 70A are connected to the wireless measurement unit 70 via a cable for wired communication.

  In the present embodiment, the two vibration sensors 70 </ b> A connected to the wireless measurement unit 70 include, for example, vibration sensors 70 </ b> A fixed to the outer ring 63 of the main bearing 60. The data collection device 80 receives the measurement data of the two vibration sensors 70A from the wireless measurement unit 70 and processes the data. Specifically, a diagnostic parameter such as an effective value is calculated from the measurement data of the vibration sensor 70A and transmitted to the data server 330 together with the time series data, and whether or not the data server 330 exceeds a corresponding threshold value (that is, Determine whether the bearing is damaged. The determination result is transmitted to the monitoring terminal 340 or the like.

(Configuration and communication mode of wireless measurement unit 70)
FIG. 4 is a diagram for explaining the configuration and communication mode of the wireless measurement unit 70 according to the embodiment of the present invention. 4A, in the nacelle 90, there are two vibration sensors 70A, a wireless measurement unit 70 that receives an output from the vibration sensor 70A, an antenna 81 connected to the wireless measurement unit 70, a wireless LAN ( A data collection device 80 that communicates with an access point 82 corresponding to a repeater of the Local Area Network and a wireless measurement unit 70 is provided. Another vibration sensor 70 </ b> B disposed on the main bearing 60 is connected to the data collection device 80. In the figure, a broken line indicates a wireless communication path, and a solid line indicates a wired communication path such as a cable.

  The wireless measurement unit 70 wirelessly communicates with the access point 82 via the antenna 81, and the data collection device 80 communicates with the access point 82 by wire or wirelessly. Therefore, the wireless measurement unit 70 and the data collection device 80 communicate via the access point 82.

  The wireless measurement unit 70 receives the measurement data output from the two vibration sensors 70A, the filter 72 for removing noise components and the like from the measurement data received by the input channel 71, and amplifies the output from the filter 72. A gain unit 73 and an A / D (Analog / Digital) conversion unit 74 that converts an analog amount output from the gain unit 73 into digital data are provided. Further, a CPU (Central Processing Unit) 75 for processing the measurement data after conversion into digital data, and a wireless LAN (Local Area Network) module 77 corresponding to a wireless communication unit are provided. The wireless LAN module 77 includes a modem (modulation / demodulation) and the like. The CPU 75 connects a memory 76 corresponding to a nonvolatile or volatile storage area for storing data, and a timer 78.

  The input channel 71 is provided for inputting measurement data from the plurality of vibration sensors 70A. The input channel 71 inputs measurement data from the two vibration sensors 70 </ b> A by channel switching according to a control signal from the CPU 75. As described above, since the input channel 71 of the wireless measurement unit 70 has a multi-channel configuration, the sensor cable usage length is reduced and the number of wirings is also reduced, so man-hours for installing the device in the nacelle 90 are reduced. Less. In addition, the reduction in the number of work steps in the nacelle 90 shortens the work time, and also shortens the time during which the wind turbine generator 10 is stopped. As a result, a decrease in the amount of power generated by the wind turbine generator 10 can be suppressed.

  FIG. 4B is a diagram showing an example of a communication packet according to the embodiment of the present invention. The packet PA includes a header part HE and a data part DB. The header portion HE includes information (address etc.) for identifying the destination and transmission source of the packet, and the data portion DB includes data to be transmitted.

  When transmitting data measured by the vibration sensor 70 </ b> A to the data collection device 80, the CPU 75 sets vibration measurement data input in time series from the A / D conversion unit 74 for each predetermined block (for example, every second). A packet PA in which the unit data is stored in the data part DB is generated by dividing the number of data (hereinafter also referred to as unit data). The identifier of the vibration sensor 70A that measured the vibration data is given to the measurement data in the data part DB, that is, the vibration data. Preferably, time data output from the timer 78, that is, time data indicating the measurement time of vibration data is also stored in the data unit DB in association with the unit data. The information on the header part HE is stored in advance in the memory 76, and the CPU 75 reads the information from the memory 76 and stores it in the header part HE.

  When receiving a data transmission command from the data collection device, the CPU 75 transmits the generated packet PA to the data collection device 80 via the wireless LAN module 77 and the antenna 81. Thereby, the wireless measurement unit 70 can transmit the vibration data measured by the vibration sensor 70A to the data collection device 80 according to the measurement order (time series order = block number assigned to each block at the time of division). . The data stored in the packet PA may include other types of information such as error correction codes.

(Configuration of data collection device 80)
FIG. 5 is a block diagram showing an example of the configuration of the data collection device 80 according to the embodiment of the present invention. Referring to FIG. 5, the data collection device 80 includes an antenna 602 for receiving radio waves, a radio communication unit 700 for performing transmission / reception control and data processing via the antenna 602, an input / output unit 604, volatile or non-volatile. A data collection unit 606 with a built-in memory, a DC power source 608 for supplying power to the wireless communication unit 700, and an I / F (abbreviation for InterFace) unit 601 for inputting / outputting to / from each unit including the vibration sensor 70B. The input / output unit 604 controls data input / output between the data collection unit 606 and the CPU 704.

  The I / F unit 601 corresponds to a data acquisition unit that inputs vibration measurement data from the vibration sensor 70 </ b> B connected by wire, and outputs the acquired data / information to the CPU 704 in the order of input (acquisition).

  The wireless communication unit 700 includes a wireless communication circuit unit 702, a timer 703, and a CPU (Central Processing Unit) 704. Radio communication circuit section 702 demodulates and A / D-converts the signal received from antenna 602, outputs the converted data to CPU 704, D / A-converts and modulates the data from CPU 704, and converts the converted data. Are transmitted via the antenna 602.

  When the wireless communication unit 700 receives a packet PA storing vibration measurement data from the wireless measurement unit 70, the wireless communication unit 700 receives data (measurement data to which an identifier of the vibration sensor is attached, and corresponding data) from the data part DB of the received packet PA. Time data) is extracted and stored in the memory of the data collection unit 606 via the input / output unit 604. In addition, the measurement data of the vibration sensor 70B input via the I / F unit 601, that is, preferably the time data of the timer 703 is associated with the time data of the timer 703 according to the measurement order, and stored in the memory of the data collection unit 606 via the input / output unit 604. Store.

  In addition, when the wireless communication unit 700 receives a request from the data collection device 80 via the antenna 602, data (measurement data and corresponding time data) is received from the memory of the data collection unit 606 via the input / output unit 604. Read out. The read data is transmitted to the requesting apparatus via the antenna 602, for example, in the form of the packet PA described above.

  As described above, the wireless measurement unit 70 has the data collection unit 606 (memory), and stores (saves) the measurement data (vibration data) as time-series data according to the measurement order. The packet PA is generated by reading from the data collection unit 606 and storing the set of measurement data and corresponding time data in the data unit DB, and transmits the packet PA to the request source device (data collection device 80).

  The request source data server 330 stores the received data in a predetermined memory, processes the data, and transmits the data to the monitoring terminal 340. In addition, when the monitoring terminal 340 processes the measurement data received from the data server 330 in which the measurement data received from the data collection device 80 is accumulated and outputs the monitor (display etc.), the user uses the output data to calculate the wind power. The operating state such as vibration of the power generation apparatus 10 can be monitored.

(Example of monitor display)
FIG. 6 is a diagram showing a monitor display example according to the embodiment of the present invention. In FIG. 6, the frequency spectrum by vibration data is shown. The waveform W2 of the frequency spectrum in FIG. 6 shows vibration data measured under certain operating conditions. The waveform W2 can provide support data for diagnosing (normal / abnormal) the operating state of the monitored device (main bearing 60) to the user.

(Operating conditions and data collection)
In the present embodiment, the measurement of vibration data by the wireless measurement unit 70 side is performed in synchronization with data collection indicating another operation state by the data collection device 80.

  FIG. 7 is a graph for explaining data measurement / collection in synchronization with the operating conditions according to the embodiment of the present invention. The vertical axis of the graph of FIG. 7 represents the amount of power generated by the generator 50, and the horizontal axis represents the rotational speed (rotation speed) of the main shaft 20. In the present embodiment, the power generation amount information 60A indicates the output of the generator 50, and the output is proportional to the rotational shaft torque. It is. The rotation information 60 </ b> B indicates the rotation speed of the blade 30 or the rotation speed of the main shaft increased by the gear box 40.

  The operating conditions of the wind power generator 10 vary depending on the environment such as the wind conditions, and the operating state data indicating the operating state such as vibration, rotation speed, power generation amount, wind speed and the like changes according to the operating conditions. That is, in the case of the wind turbine generator 10 in which the operating condition changes from moment to moment, in order to accurately diagnose the operating state, whether the change in vibration is due to the change in the operating condition or damage to the bearing or gear (gear). It is necessary to distinguish whether it depends on. Therefore, in the present embodiment, the data collection device 80 detects a predetermined operating condition from the graph of FIG. 7, and the above-described various operating state data (such as vibration data from each vibration sensor) under the detected operating condition. ) To collect.

  Specifically, the graph data of FIG. 7 is generated from the time series power generation amount information 60A and the rotation information 60B measured by the data collection device and stored in the data server. Then, from the generated graph data, a time period (hereinafter also referred to as a “conditional period”) corresponding to a range in which a predetermined condition 1 and condition 2 (FIG. 7) are established for the power generation amount and the spindle rotation speed is calculated. Of the vibration data collected from the wireless measurement unit 70 and the vibration data input from the vibration sensor 70B, that is, the data stored in the memory of the data collection unit 606, the associated time data is stored on the data server 330. An abnormality diagnosis is performed in comparison with the threshold value. Thereby, the vibration change (trend) of each part under the driving condition (that is, the condition period) in which the influence on the bearing torque is constant is detected, and the support information for the user to accurately diagnose the rolling state is presented. be able to. Conditions 1 and 2 are determined from predetermined upper and lower limits of the power generation amount and the rotational speed.

  Vibration data corresponding to the above-described condition period is identified and stored on the data server 330. That is, the measurement data of the vibration sensor 70A is stored in the memory 76 of the wireless measurement unit 70 as time series data. Therefore, when the wireless measurement unit 70 receives a request from the data collection device 80, the wireless measurement unit 70 measures at a time interval designated by the data collection device 80, and transmits it to the data server 330 through the data collection device 80.

(Processing flowchart)
FIG. 8 is a flowchart showing processing associated with a communication sequence between the wireless measurement unit 70 and the data collection device 80 according to the embodiment of the present invention. The program on the wireless measurement unit 70 side according to this flowchart is a program that executes measurement in response to a measurement command command from the data collection device 80, and is stored in the memory. The processing in FIG. 8 is assumed to start when the wireless measurement unit 70 and the data collection device 80 are powered on.

  Normally, the wireless measurement unit 70 performs measurement after receiving a measurement command (a measurement interval is specified) from the data collection device 80. Next, a command specifying the number of data per divided block is transmitted, and the data is divided. The data is transmitted to the data collection device 80 in the order of the designated blocks. Referring to FIG. 8, synchronization processing may be performed between data collection device 80 and wireless measurement unit 70 (step S1, step T1). Specifically, the CPU 704 of the data collection device 80 transmits time data measured by its own timer 703 to the wireless measurement unit 70 together with the synchronization processing start request (step T1). When receiving the synchronization processing start request, the CPU 75 of the wireless measurement unit 70 sets the time data received together with the request in its own timer 78. As a result, synchronization processing is performed on the timer 78 of the wireless measurement unit 70 and the timer 703 of the data collection device 80, and thereafter, both timers can measure substantially the same time.

  Next, in the data collection device 80, the CPU 704 transmits a data collection command to the wireless measurement unit 70 and receives a response (steps T2 and T3). The reception of the response is determined (step T4), and while not received (NO in step T4), the process returns to step T2. If it is determined that it has been received (YES in step T4), a command for designating the number of blocks to be transmitted (command for designating the number of data per block) is transmitted and a response is received (steps T5 and T6). The reception of the response is determined (step T7), and while not received (NO in step T7), the process returns to step T5.

  In the wireless measurement unit 70, the CPU 75 responds when it receives a collection command (steps S2 and S3), and starts collecting (receiving and storing) vibration measurement data from the vibration sensor 70A (steps S4 and S5). The measurement data is stored in the memory 76 in association with the time data from the timer 78 (step S5). Thereby, the vibration data is stored in the memory 76 in time series. Also, a command specifying the number of blocks to be transmitted is received and a response is transmitted (steps S6 and S7).

  Thereafter, when a predetermined amount of measurement data is collected (stored) (for example, when data is collected for 10 seconds), the CPU 75 of the wireless measurement unit 70 stores the measurement data in the packet PA. To start transmission (steps S8, S9 and S10). At this time, the transmission data for 10 seconds is divided for each unit data (step S8). The data collection device 80 transmits a measurement data transmission command, and receives the measurement data of the packet PA as a response (steps T8 and T9). The CPU 75 of the wireless measurement unit 70 receives the transmission command, and transmits the corresponding time data and the number of blocks corresponding to the designated number of data in the packet PA as a response (steps S9 and S10). Accordingly, ten packets PA are generated from the measurement data for 10 seconds and transmitted to the data collection device 80. The CPU 704 of the data collection device 80 receives the packet PA from the wireless measurement unit 70 (step T9), and stores the data in the data part DB of the received packet PA in the memory of the data collection unit 606.

  Further, the CPU 704 of the data collection device 80 determines whether or not to end the processing based on whether or not all data has been received (step T10). When it is determined to end (YES at step T10), the process ends. When it is not determined (NO at step T10), the process returns to step T8 and the subsequent processes are repeated.

  In the process of FIG. 8, the data collection device 80 periodically transmits the collection command by repeating the process, but is not limited to the periodic transmission. For example, the collection command may be transmitted once after the synchronization process is performed.

(Resend data)
In the present embodiment, when there is a lack of communication data (data loss) due to wireless communication between the wireless measurement unit 70 and the data collection device 80, the wireless measurement unit 70 stores the data in the memory 76. Send the measurement data again.

  That is, in wireless communication, the CPU 704 of the data collection device 80 detects whether or not time-series data is missing (data loss) from the time data corresponding to the measurement data received from the wireless measurement unit 70. If the data can be received normally, the data for 10 seconds is continuous, but if there is data missing, for example, the measurement data associated with the time data of 4 seconds or 5 seconds has not been received. It becomes. When the lack of time-series data is detected in this way, a retransmission request is transmitted to the wireless measurement unit 70. When receiving the retransmission request, the wireless measurement unit 70 reads the vibration data requested for retransmission from the memory 76 and transmits it again to the data collection device 80. As a result, the data collection device 80 can acquire time-series data with no gaps.

  The data retransmission request may include time data corresponding to the missing data (in the above case, the fourth and fifth seconds). As a result, the wireless measurement unit 70 can extract (read), for example, only missing vibration data from the time-series vibration data stored in the memory 76 and transmit the extracted data to the data collection device 80.

  In the present embodiment, the operation state is monitored from the vibration data of each part of the wind power generator 10, but the type of measurement data used is not limited to vibration data.

  When the data collection device 80 requests retransmission when all measurement data cannot be received from the wireless measurement unit 70, the data collection device 80 transmits to the wireless measurement unit 70 so that the number of data per block is reduced. The data is received from the wireless measurement unit 70 in units of blocks with a reduced number of data.

(First modification)
In the first modification according to the present embodiment, another example of an attachment mode of the vibration sensor 70A in the main bearing 60 is shown.

  FIG. 9 is a diagram illustrating an attachment mode of the wireless measurement unit 70 according to the first modification of the embodiment of the present invention. In FIG. 9, unlike FIG. 3, the wireless measurement unit 70 and the vibration sensor 70A are attached to the outer ring 63 on the rotation side of the main bearing 60 and also to the inner ring 64 on the fixed side. Two vibration sensors 70A are connected to the wireless measurement units 70 of the outer ring 63 and the inner ring 64 via cables. The data collection device 80 receives a vibration data packet PA from each wireless measurement unit 70. At this time, the vibration data stored in the data part DB of the packet PA is given the identifier of the vibration sensor 70A that detects the vibration data. The wireless measurement unit 70 and the data collection device 80 have a table in which the identifier of the vibration sensor 70A is associated with data indicating the mounting position of the vibration sensor 70A.

  Therefore, the table can be searched based on the identifier assigned to the received vibration data, and the mounting position of the vibration sensor 70A that has detected the vibration data can be determined from the search result. Information on the determined mounting position is transmitted to the data server 330 together with the vibration data. The monitoring terminal 340 outputs information (such as the graph of FIG. 6) based on the received vibration data in association with the received mounting position information, thereby outputting to the user diagnostic information on the driving state specifying the vibration position. Can be provided.

  When the main bearing 60 is used for rotating the inner ring and fixing the outer ring, as shown in FIG. 3, the vibration sensor 70A attached to the outer peripheral surface of the outer ring 63 detects vibration caused by damage to the outer peripheral surface of the outer ring 63 close to the mounting position. Can do. On the other hand, the damage on the inner peripheral surface of the outer ring 63 on the side opposite to the mounting position in FIG. 3 is separated from the damaged position of the vibration sensor 70A on the outer peripheral surface in FIG. Therefore, vibration detection sensitivity is not high.

  Therefore, in this other embodiment, as shown in FIG. 9, the vibration sensor 70A is attached to the inner peripheral surface of the inner ring 64 on the rotation side. In this case, when the inner ring 64 rotates, the vibration sensor 70A can be brought closer to the damage position on the inner peripheral surface of the outer ring 63, and the detection sensitivity of the outer ring damage can be increased.

  Conversely, when the main bearing 60 is used for inner ring fixing and outer ring rotation, the diagnostic accuracy can be improved by attaching the vibration sensor 70A to the fixed inner ring 64 and the rotating outer ring 63.

(Second modification)
In the second modification according to the present embodiment, the data collection device 80 detects information related to the diagnosis of the driving state.

  Specifically, the CPU 704 of the data collection device 80 calculates an effective value, a peak value, or the like from the received time-series vibration data and transmits it to the data server 330. The monitoring terminal 340 stores the received data such as the effective value or peak value in the memory and displays it on the monitor.

  By storing (storing) the time series data of vibration data and data such as effective values or peak values in the data server 330, the monitoring terminal 340 can perform frequency analysis and envelope processing using the stored data. . Therefore, in order to make a more detailed diagnosis when the effective value or peak value of the vibration data exceeds a threshold value, the vibration data that is the source of the vibration data can be easily acquired, and an accurate diagnosis of the driving state can be obtained. Is possible.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 10 Wind power generator, 20 spindle, 40 gear box, 50 generator, 60 main bearing, 60A power generation amount information, 60B rotation information, 70 wireless measurement unit, 70A, 70B vibration sensor, 80 data collection device, 82 access point, 90 Nacelle, 320 Internet, 330 data server, 340 monitoring terminal, 606 data collection unit.

Claims (6)

A state monitoring system for monitoring the state of equipment provided in a wind turbine generator,
A wireless measurement unit including a sensor provided in the device;
A data collection device that wirelessly communicates with the wireless measurement unit;
The wireless measurement unit is
A memory for storing measurement data acquired from the sensor;
A wireless communication unit for transmitting measurement data acquired from the sensor to the data collection device,
The data collection device includes:
A state monitoring system that requests the wireless measurement unit to retransmit the measurement data when measurement data cannot be received from the wireless measurement unit. The wireless measurement unit is
A first timer;
Storage means for storing the measurement data acquired from the sensor in the memory with the measurement data associated with the first time data measured by the first timer according to the measurement order;
2. The state monitoring system according to claim 1, wherein the retransmission request transmitted by the wireless communication unit includes information specifying the first time data of measurement data that could not be received. The data collection device includes:
A second timer for timing,
Using a second time data timed by the second timer, a synchronization processing unit for transmitting to the wireless measurement unit a time measurement request for the first timer to time in synchronization with the second timer;
A data acquisition unit that is a sensor different from the sensor and acquires measurement data from the different sensor provided in the device;
The state monitoring system according to claim 2, further comprising collection storage means for storing the measurement data acquired by the data acquisition unit in association with the second time data of the second timer. The data collection device includes:
The wireless measurement unit is specified to specify the time interval for measurement, the measurement data is divided into blocks for each specified number of data, and transmitted in block units, and the data collection device 4. The state monitoring system according to claim 3, further comprising means for determining whether or not reception is possible, and requesting and receiving retransmission of measurement data after the already received block if reception is impossible. The data collection device includes:
Receiving storage means for storing measurement data associated with the first time data received from the wireless measurement unit;
5. The state monitoring system according to claim 4, further comprising means for reducing the number of data to be transmitted at a time and receiving it as one block when all the measurement data cannot be received from the wireless measurement unit by the receiving means. . The apparatus includes a bearing that supports a shaft communicating with the windmill,
The bearing has an inner ring through which the shaft passes, and an outer ring provided on the outer periphery of the inner ring,
One of the inner ring and the outer ring rotates concentrically around the axis in conjunction with the rotation of the windmill, and the other is fixed,
The state monitoring system according to claim 1, wherein the wireless measurement unit including the sensor is provided in at least one of the inner ring and the outer ring.

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