Rapid detection device and detection method for DP head of wind turbine generator

Abstract

The invention discloses a rapid detection device and detection method for a DP head of a wind turbine generator. The DP head in the wind turbine generator is connected to a DP network through a network wiring; n DP heads are accessed into the whole communication network; sequentially executing whole-section detection, segmented detection and single-body detection, and finding out and replacing a fault DP (Decentralized Peripheral) head; dP head measurement is efficient and rapid, waste of spare parts is avoided, the availability of a unit is improved, a plug similar to a DP head form is used for measurement, a digital display screen is used for display, and connectors of all DP head equipment and all CAN line equipment can be detected; and rapid and efficient fault checking of the PROFIBUS protocol of the wind turbine generator is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine circuit detection, and in particular to a wind turbine DP head rapid detection device and detection method. Background Art

[0002] PROFIBUS is a fieldbus standard used in automation technology. Currently, most wind turbines also use this standard protocol to transmit communications between PLCs. There are many existing wind turbines, all of which use the PROFIBUS standard protocol, and the connector uses a DB9 connector compatible with RS485, which is a Siemens DP connector.

[0003] When judging communication failures in daily life, a 220-ohm resistor is required at both ends of the DP head as a terminal resistor. The switch at the DP head is ON, and the switch in the middle is OFF if no resistor is needed, so that the entire communication circuit can work normally. In addition to the DP head, the resistance between the two communication lines should be infinite, otherwise there will be interference between the two lines, resulting in communication interruption.

[0004] When judging communication failures on a daily basis, it is necessary to remove the DP head to measure the terminal resistance and the line resistance of the connected communication line. During maintenance, it is generally necessary to first measure the 3-pin and 8-pin resistance of each communication node when the switch is ON to see if it is 220 ohms, and then remove the DP head to directly measure whether the line resistance is infinite.

[0005] There are currently two technical difficulties. The DP connector itself is small in size, and the plug terminals in the DP head are slippery. They often touch the shell during measurement, resulting in inaccurate test data and misjudgment of faults. This not only increases maintenance time, but also leads to a large degree of waste of DP heads and spare parts. In addition, removing the DP head will damage the connector and line, and increase maintenance time. Summary of the invention

[0006] In view of the above-mentioned problems existing in the prior art, in order to check the DP head, the resistance values ​​of pins 3 and 8 of the DP head can be measured quickly, efficiently and accurately; in addition, the line resistance value can be directly measured without removing the DP head, which is convenient for maintenance personnel to make decisions and deal with communication faults.

[0007] A wind turbine DP head rapid detection device, characterized by comprising a detection component and a digital display component;

[0008] The detection components include two, one is a DB9 male plug and the other is a DB9 female plug;

[0009] The digital display component includes a controller and a display screen; wherein the controller and the display screen are connected by circuit;

[0010] The detection component is inserted into the DP head connected to the wind turbine to measure and sample the connected circuit;

[0011] The sampling signal is input into the controller, and the corresponding measurement value is obtained through program operation, and the measurement value is displayed and output on the display screen.

[0012] A detection method, characterized in that

[0013] The DP head in the wind turbine is connected to the DP network through network wiring;

[0014] Either of the male and female plugs of each DP head can be inserted into the connection device to connect the device to the DP network, while the other plug is in an unplugged state and serves as a measurement interface;

[0015] N DP heads are connected to the entire communication network;

[0016] 1) Whole-segment detection

[0017] Insert the detection component of the rapid detection device into the measurement interface of the DP head at one end of the entire DP communication network as a measurement end for displaying the measurement value; determine whether there is a fault in the DP communication network according to the measurement value;

[0018] 2) Segment detection

[0019] When there is a fault in the DP communication network, further segment detection is performed, and the DP head at the N / 2 (integer) position is inserted into the detection component of the fast detection device as a measurement end; the entire DP communication network is divided into two sections, and the detection process in step 1) is performed on the two sections respectively, and it is determined that the fault is in one of the two sections according to the measured value;

[0020] 3) Continue to perform the segment detection process in step 2) for the faulty segment after segment detection until the number of DP heads included in the faulty segment is less than the set value, and no further segment detection is performed, and enter step 4) single-unit detection;

[0021] 4) Monomer detection

[0022] Remove the DP heads in the faulty section, insert each DP head into the detection component of the rapid detection device, measure the measurement values ​​when the terminal resistance switch is in the ON and OFF positions respectively, find out the faulty DP head and replace it.

[0023] The beneficial effects of the present invention are:

[0024] Measuring DP heads is efficient and fast, avoiding spare parts waste and improving the unit availability. It uses a plug similar to the DP head to measure; it uses a digital display screen like an ohmmeter to display; it can detect the resistance value of the connectors of all DP head devices and all CAN line devices; it can quickly and efficiently check faults of wind turbines using the PROFIBUS protocol; it can measure the internal resistance of the module to determine whether it is available. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is the system diagram of the detection device;

[0026] Figure 2 This is the DP head circuit diagram;

[0027] Figure 3 It is a network connection diagram;

[0028] In the figure: 11DP head male plug, 12DP head female plug, 13 terminal resistance switch, 14 network connection, 21DB9 male plug, 22DB9 female plug, 23 signal sampling circuit, 24 controller, 25 display screen. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figure 1 A wind turbine DP head rapid detection device comprises a detection component and a digital display component.

[0031] The detection components include two, one is a DB9 male plug and the other is a DB9 female plug.

[0032] The digital display component includes a controller, a display screen, and a signal sampling circuit, wherein the controller is connected to the display screen and the signal sampling circuit in a circuit.

[0033] Connect the detection components, namely the DB9 male plug and the DB9 female plug, to the signal sampling circuit respectively.

[0034] The signal sampling circuit measures and samples the circuits connected to the DB9 male plug and the DB9 female plug.

[0035] The sampling signal is input into the controller, and the corresponding resistance measurement value and voltage measurement value are obtained through program operation.

[0036] The resistance measurement value and voltage measurement value are displayed and output on the display screen.

[0037] In specific applications:

[0038] The communication network in the wind turbine is as follows: Figure 3 As shown in the figure, all use the PROFIBUS standard protocol, and the connector uses a DB9 connector compatible with RS485, that is, a Siemens DP connector. Figure 2 As shown, each Siemens DP head has a connected male and female plug. A 220-ohm resistor is required at both ends of the DP head as a terminal resistor. When the terminal switch on the DP head is ON, the 220-ohm resistor can be connected. When the terminal switch is OFF, the 220-ohm resistor is disconnected. The DP head is connected to the DP network through network wiring.

[0039] Either of the male or female plugs of each DP head can be inserted into a connection device to connect the device to the DP network, while the other plug is in an unplugged state and can be used as a measurement interface.

[0040] like Figure 3 As shown, N DP heads are connected to the entire communication network.

[0041] 1) Whole-segment detection

[0042] A detection component of a rapid detection device is inserted into the measurement interface of a DP head at one end of the entire DP communication network as a measurement end for displaying measurement values; and whether there is a fault in the DP communication network is determined based on the measurement values.

[0043] The other section of the entire DP communication network opposite to the measuring end is the far end.

[0044] First, the terminal resistance switches of the DP heads at both ends of the entire DP communication network are in the ON position, and the terminal resistance switches of the remaining DP heads are in the OFF position.

[0045] 1-1) Turn the terminal resistance of the DP connectors at both ends of the DP cable to ON. The normal measured value is about 110 ohms.

[0046] 1-2) Set the terminal resistance switch at the measuring end to OFF and the terminal resistance switch at the far end to ON. The normal measured value is about 220 ohms.

[0047] 1-3) Set the terminal resistance switch at the far end to OFF and the terminal resistance switch at the measuring end to ON. The normal measured value is also around 220 ohms.

[0048] 1-4) The terminal resistance switches at both ends are in the OFF position, and the normal measured value is infinite.

[0049] If an abnormal measurement value appears when the above process is executed, it indicates that there is a fault in the DP communication network section.

[0050] 2) Segment detection

[0051] When there is a fault in the DP communication network, further segment detection is performed, and the DP head at the N / 2 (integer) position is inserted into the detection component of the fast detection device as the measurement end. The entire DP communication network is divided into two sections, and the detection process in step 1) is performed on the two sections respectively, and the fault is judged to be in one of the two sections according to the measured value.

[0052] 3) Continue to perform the segmented detection process in step 2) for the faulty segment after segmented detection until the number of DP heads included in the faulty segment is less than the set value, such as 3. That is, when the number of DP heads in the faulty segment is 3, no further segmented detection is performed, and enter step 4) single detection.

[0053] 4) Single detection

[0054] Remove the DP heads in the faulty section, insert each DP head into the detection component of the rapid detection device, measure the measurement values ​​when the terminal resistance switch is in the ON and OFF positions respectively, find out the faulty DP head and replace it.

[0055] In the above steps 1)-3), the devices in the DP communication network are in a shutdown and unpowered state.

[0056] When the device in the DP communication network is powered on, the voltage value needs to be detected in steps 1)-3), and the terminal resistance of the DP head at both ends is turned on. The normal voltage value is about 1.1 volts, while the voltage value in the case of a fault is about 0.62 volts. The normal voltage value should be greater than the fault voltage value.

[0057] The technology of this application can not only measure the line resistance without removing the DP head, but also measure the DP head resistance without unplugging the plug, and even measure the internal resistance of the module to determine whether it is available: a wind turbine has 7 to 11 DP heads, and each measurement takes about 5 minutes to unplug and remove the DP head, so the longest time is 55 minutes. In addition, the measurement difficulty is very high, resulting in a unit often taking 4 to 6 days to successfully operate. If the technology of this application is used, all troubleshooting work can be completed in half a day, which is equivalent to saving 5 days. Calculated based on the power generation of about 1920kWh per hour and the electricity price of 0.3 yuan, a profit of 69,120 yuan can be made.

[0058] The present invention measures DP heads efficiently and quickly, avoids spare parts waste, and improves the unit availability. It uses a plug similar to a DP head for measurement; uses a digital display screen like a resistance meter to display; can detect the resistance values ​​of the connectors of all DP head devices and all CAN line devices; the PROFIBUS protocol of the wind turbine set can quickly and efficiently check faults; can measure the internal resistance of the module to determine whether it is available.

[0059] Finally, it should be noted that the above description is only an explanation of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail, those skilled in the art can still modify the technical solutions described above or replace some of the technical features with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wind turbine DP head rapid detection device, characterized in that: Including detection components and digital display components; The detection components include two, one is a DB9 male plug and the other is a DB9 female plug; The digital display component includes a controller and a display screen; wherein the controller and the display screen are connected by circuit; The detection component is inserted into the DP head connected to the wind turbine to measure and sample the connected circuit; The sampling signal is input into the controller, and the corresponding measurement value is obtained through program operation, and the measurement value is displayed and output on the display screen.

2. According to claim 1, a wind turbine DP head rapid detection device is characterized in that: The digital display assembly includes a signal sampling circuit; The detection components, namely the DB9 male plug and the DB9 female plug, are respectively connected to the signal sampling circuit, and the signal sampling circuit measures and samples the circuits connected to the DB9 male plug and the DB9 female plug.

3. A wind turbine DP head rapid detection device according to claim 1, characterized in that: The measured values ​​include resistance measurement values ​​and voltage measurement values.

4. A wind turbine DP head rapid detection device according to claim 1, characterized in that: The DB9 male plug in the detection component is used to adapt to the female plug in the DP head, and the DB9 female plug in the detection component is used to adapt to the male plug in the DP head.

5. A wind turbine DP head rapid detection device according to claim 1, characterized in that: The communication network in the wind turbine uses the PROFIBUS standard protocol, and the connector uses a DB9 connector compatible with RS485, that is, a Siemens DP connector, where each Siemens DP connector has connected male and female plugs.

6. A detection method based on the wind turbine DP head rapid detection device of claim 1, characterized in that: The DP head in the wind turbine is connected to the DP network through network wiring; Either of the male and female plugs of each DP head can be inserted into the connection device to connect the device to the DP network, while the other plug is in an unplugged state and serves as a measurement interface; N DP heads are connected to the entire communication network; 1) Whole-segment detection Insert the detection component of the rapid detection device into the measurement interface of the DP head at one end of the entire DP communication network as a measurement end for displaying the measurement value; determine whether there is a fault in the DP communication network according to the measurement value; 2) Segment detection When there is a fault in the DP communication network, further segment detection is performed, and the DP head at the N / 2 (integer) position is inserted into the detection component of the fast detection device as a measurement end; the entire DP communication network is divided into two sections, and the detection process in step 1) is performed on the two sections respectively, and it is determined that the fault is in one of the two sections according to the measured value; 3) Continue to perform the segment detection process in step 2) for the faulty segment after segment detection until the number of DP heads included in the faulty segment is less than the set value, and no further segment detection is performed, and enter step 4) single-unit detection; 4) Monomer detection Remove the DP heads in the faulty section, insert each DP head into the detection component of the rapid detection device, measure the measured values ​​when the terminal resistance switch is in the ON and OFF positions respectively, find out the faulty DP head and replace it.

7. The detection method according to claim 6, characterized in that: Step 1) includes: 1-1) Turn the terminal resistance of the DP connector at both ends of the DP cable to ON and compare the measured value with the normal value; 1-2) Set the terminal resistance switch at the measuring end to OFF and the terminal resistance switch at the far end to ON, and compare the measured value with the normal value; 1-3) Set the terminal resistance switch at the far end to OFF and the terminal resistance switch at the measuring end to ON, and compare the measured value with the normal value; 1-4) The terminal resistance switches at both ends are in the OFF position, and the measured value is compared with the normal value; If the above process is performed and an abnormal measurement value appears in any case, it indicates that there is a fault in the DP communication network section.

8. The detection method according to claim 7, characterized in that: Step 1) includes: in different terminal resistance switch setting modes, normal values ​​are 110 ohms, 220 ohms and infinity respectively.

9. The detection method according to claim 6, characterized in that: In step 3), the set value is selected to be greater than or equal to 3.

10. The detection method according to claim 6, characterized in that: In the above steps 1)-3), the devices in the DP communication network are in a shutdown and unpowered state; When the devices in the DP communication network are in the startup and power-on state, the voltage value is also detected in steps 1)-3), and the terminal resistance switches of the DP heads at both ends of the communication network are turned on. If the measured value is lower than the normal voltage value, there is a fault in this section of the DP communication network.

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