A monitoring method and device for preventing a double-fed wind turbine from failing to quickly retract its blades

Abstract

The present invention discloses a monitoring method and device for preventing the failure of rapid blade retraction of a doubly-fed wind turbine, which belongs to the field of wind turbine safety control, and comprises the steps of returning the output signals of the rapid blade retraction signal, bypass switch signal and limit switch signal of the main control to the main control I / O input terminal through hard wiring, thereby monitoring the three key signals of the main control and the variable pitch system. The present invention can prevent the failure of blade retraction caused by the rapid blade retraction signal, bypass switch signal and the like being short-circuited by a slip ring or artificially short-circuited.

Description

Technical Field

[0001] The present invention relates to the field of wind turbine safety control, and more specifically, to a monitoring method and device for preventing a doubly-fed wind turbine from failing to quickly retract its blades. Background Art

[0002] In the DC pitch control system of a doubly-fed wind turbine, during normal grid-connected operation of the wind turbine, the fast pitch control line is in a high-level state. When the wind turbine master controller triggers the brake program and a fault of more than 180 requires fast pitch retraction, the master controller outputs a low-level fast pitch retraction signal, which is transmitted to the DC pitch control system through the signal slip ring between the master controller and the pitch control system, activating the battery for fast pitch retraction. If the slip ring slide jumps or short-circuits, causing the fast pitch retraction signal or bypass switch signal to be short-circuited to a 24V high-level state, the master controller fast pitch retraction signal cannot be transmitted to the pitch control system, which will cause the wind turbine to fail to retract its pitch.

[0003] For example: In 2017, a wind farm failed to retract the blades, and the wind turbine overspeeded and burned down the machine. The cause of the accident was investigated and analyzed: it was due to an internal short circuit in the slip ring, which caused the three signals of the variable pitch fault signal, the rapid retraction signal, and the blade storm position signal to be short-circuited together. When the variable pitch fault signal is normal, it is in a high-level state, and these three signals are forced to be 24v high. When the wind turbine main shaft overspeed module is activated and the safety chain disconnection fault is activated, the main control issues a battery rapid retraction signal, which cannot be transmitted to the variable pitch system. At the same time, because the blade storm position signal is short-circuited to a high level, it gives the main control a false signal that the blade has returned to 92 degrees, and the blade angle has been stopped at the 17.3-degree position before the fault and remains unchanged. The inventor of the present invention aims to solve the above technical problems. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a monitoring method and device for preventing the failure of rapid blade retraction of a doubly-fed wind turbine, which can prevent blade retraction failure accidents caused by slip ring short-circuiting or human short-circuiting of rapid blade retraction signals, bypass switch signals, etc.

[0005] The object of the present invention is achieved through the following solutions:

[0006] A monitoring method for preventing a doubly-fed wind turbine from failing to quickly retract its blades comprises the following steps:

[0007] The control signal of the main control-pitch system is monitored by circuits and software to prevent blade retraction failure accidents caused by slip ring slideway vibration or short circuit.

[0008] Further, the utilizing circuit comprises the sub-steps of:

[0009] The output signals of the master control's fast pitch retraction signal, bypass switch signal and limit switch signal are returned to the master control I / O input terminal through hard wiring, thereby monitoring the three key signals of the master control and pitch control system.

[0010] Furthermore, the use of software includes the following sub-steps:

[0011] Step 1: Rapidly retract the propeller 103 signal monitoring;

[0012] Step 2: bypass switch 105 signal monitoring;

[0013] Step 3: Limit switch 129 signal monitoring.

[0014] Furthermore, in step 1, the sub-steps are included:

[0015] Step 11: First, perform hardware modification, that is, add a main control IO input port to monitor and feedback the actual level status of the main control fast retracting signal;

[0016] Step 12: Then, in the software optimization settings, after the main control activates the fast propeller retraction signal, delay and check whether the IO input level is low. If it is not low, activate the "slip ring 103 signal short circuit" alarm. After the activation times reaches the set value, the "slip ring 103 signal short circuit" alarm is reported and the machine is shut down.

[0017] Furthermore, in step 2, the sub-steps are included:

[0018] Step 21: During the fan startup process, the main control outputs a bypass switch signal for a set time. After the set time, the bypass switch signal level is low.

[0019] Step 22: Add a master control IO input port in the hardware modification to monitor and feedback the actual level status of the master control bypass switch signal;

[0020] Step 23: In the software optimization settings, after the master control outputs the bypass switch signal for the set time, check whether the IO input level is low. If it is not low, the master control triggers the "slip ring 105 signal short circuit" fault.

[0021] Furthermore, in step 3, the sub-steps are included:

[0022] Step 31: After the wind turbine safety chain is triggered, the blade returns to the 92-degree safety position, and the pitch control system outputs a high-level 129 signal to the main control through the slip ring via hard wiring, notifying the main control that the blade has returned to the 92-degree safety position; during normal operation or startup of the wind turbine, after the blade leaves the 92-degree position, the limit switch 129 signal changes to a low level;

[0023] Step 32: In the software optimization settings, after the wind turbine is connected to the grid and running, the 129 signal is monitored in real time. If it is detected that the 129 signal jumps to a high level and remains unchanged for a period of time, the "slip ring 129 signal short circuit alarm" is triggered. After multiple activations, the main control reports a "slip ring 129 signal short circuit" fault.

[0024] Furthermore, step 12 is periodically executed to check once during battery detection or, after the blade maintenance switch is actuated, step 12 is automatically executed once when the fan is started for the first time.

[0025] Further, in step S12, the activation times reaches the set value of 3 activations within 24 hours.

[0026] Further, in step S32, the multiple activations are performed three times within 24 hours.

[0027] A monitoring device for preventing a doubly-fed wind turbine from failing to quickly retract its pitches comprises a main control I / O module, a variable pitch system interface circuit and hard wiring, wherein the hard wiring is used to connect the output signals of the main control's rapid pitch retraction signal, bypass switch signal and 92-degree limit switch signal to the main control I / O input terminal, and execute any of the above-described monitoring methods for preventing a doubly-fed wind turbine from failing to quickly retract its pitches.

[0028] The beneficial effects of the present invention include:

[0029] The present invention provides a monitoring method for preventing the failure of rapid pitch retraction of a doubly-fed wind turbine for wind turbine safety. The existing I / O points of the wind turbine controller are used to monitor three key signals of the main control and pitch control system control lines. The purpose of preventing the failure of rapid pitch retraction of the doubly-fed wind turbine is achieved through circuit and software optimization.

[0030] The present invention plays an important positive role in preventing the failure of rapid blade retraction of a doubly-fed wind turbine and preventing the wind turbine from burning out or failing.

[0031] The present invention monitors the main control-pitch control signal, and can prevent the blade retraction failure accident caused by the rapid retraction signal and the bypass switch signal being short-circuited by the slip ring or artificial short-circuited. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 is a circuit structure diagram of an embodiment of the present invention;

[0034] Figure 2 A flowchart of the method steps of an embodiment of the present invention;

[0035] In the figure, 103 represents the custom 103 signal, 105 represents the custom 105 signal, and 129 represents the custom 129 signal. DETAILED DESCRIPTION

[0036] All features disclosed in all embodiments in this specification, or steps in all methods or processes implicitly disclosed, except for mutually exclusive features and / or steps, can be combined and / or expanded or replaced in any manner.

[0037] In order to solve the problems existing in the prior art described in the background, the inventor of the present invention, after creative thinking, believes that it is necessary to optimize and improve the existing circuits and main control software to realize the monitoring of three key signals of the main control and pitch control systems. Specifically, the improvements involved include the main control circuit and software optimization strategy.

[0038] In the transformation of the main control circuit, such as Figure 1 As shown, the main inventive concept of the embodiment of the present invention is to return the output signals of the main control's fast pitch retraction signal, bypass switch signal and 92-degree limit switch signal to the main control I / O input terminal through hard wiring, thereby monitoring the three key signals of the main control and pitch control system.

[0039] In terms of software optimization strategy, based on the above improved circuit structure, such as Figure 2 As shown, the specific steps include:

[0040] Step 1: Rapid retraction signal 103 monitoring: First, perform hardware modification, that is, add a main control IO input port to monitor and feedback the actual level status of the main control rapid retraction signal. Then, in the software optimization setting, after the main control activates the rapid retraction signal, delay 100ms to check whether the IO input level is low. If it is not low, activate the "slip ring 103 signal short circuit" alarm. If it is activated 3 times in 24 hours, the "slip ring 103 signal short circuit" will be reported and the machine will be shut down. This detection function is regularly checked during the weekly battery test or automatically detected once when the fan is started for the first time after the blade maintenance switch is activated.

[0041] Step 2: Bypass switch 105 signal monitoring: During the fan startup process, the main control will output the bypass switch signal for 10 seconds. After 10 seconds, the bypass switch signal level is low. In the hardware modification, add a main control IO input port to monitor and feedback the actual level status of the main control bypass switch signal. In the software optimization setting, after the main control outputs the bypass switch signal for 10 seconds, check whether the IO input level is low at the 12th second. If it is not low, the main control triggers the "slip ring 105 signal short circuit" fault.

[0042] Step 3: Limit switch 129 signal monitoring: After the wind turbine safety chain is triggered, the three blades return to the 92-degree safety position, and the pitch control system outputs a high-level 129 signal to the main control through the slip ring through hard wiring, notifying the main control that the three blades have returned to the 92-degree safety position. During normal operation or startup of the wind turbine, after the blades leave the 92-degree position, the limit switch signal 129 must become a low level. In the software optimization setting, after the wind turbine is connected to the grid, the 129 signal is monitored in real time. If it is detected that the 129 signal jumps to a high level and remains unchanged after a delay of 100ms, the "slip ring 129 signal short circuit alarm" is triggered. If it is activated 3 times in 24 hours, the main control will report a "slip ring 129 signal short circuit" fault.

[0043] After the optimization and transformation of the technical solution of the embodiment of the present invention was completed, 133 wind turbines in a certain wind farm were put into operation for 9 months. All fault records from January 1 to September 30, 2018 were counted (as shown in Table 1). It was found that 7 wind turbines A110-JN005; A202_JN015; B104_JN079; A109-JN006B110_JN073; B510_JN130; B210_JN085 had internal short circuit faults in the slip ring. This means that after adding the slip ring monitoring circuit, the blade retraction failure that may occur in the 7 wind turbines was avoided, which is of great significance and has significant technical benefits.

[0044] Moreover, in the software optimization settings, it can be controlled that the slip ring short circuit fault will only be triggered to shut down when it occurs more than 3 times in a row within 24 hours, thus avoiding false alarms of slip ring short circuit faults.

[0045] Table 1

[0046]

[0047] The actual operation data after the wind turbine main controller circuit transformation and software optimization proves that the present invention plays an important positive role in preventing the failure of rapid blade retraction of the doubly-fed wind turbine and preventing the wind turbine from burning out or failing.

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the present invention is further described in detail below, including the following steps:

[0049] 1) Rapid propeller retraction 103 signal monitoring

[0050] Monitoring principle: When the fan system operates normally, the fast blade retraction signal 103 output by the fan master control is at a high level.

[0051] Hardware modification: Add a main control IO input port, and feed back the fast propeller retraction signal 103 output by the main control to the DI interface through hard wiring to monitor the actual level of the 103 signal in real time.

[0052] Software monitoring logic: After the master controller activates the fast blade retraction signal, it delays 100ms to check whether the IO input level is low. If it is not low, it activates the "slip ring 103 signal short circuit" alarm. If it is activated 3 times in 24 hours, it will report the "slip ring 103 signal short circuit" and shut down. This detection function is regularly checked during the weekly battery test or automatically detected once when the fan is started for the first time after the blade maintenance switch is activated.

[0053] 2) Bypass switch 105 signal monitoring

[0054] Monitoring principle: During the fan startup process, the main control will output a bypass switch signal for 10 seconds. After 10 seconds, the bypass switch signal level is low.

[0055] Hardware modification: Add a main control digital input interface, feed back the bypass switch signal 105 output by the main control to the DI interface through hard wiring, and monitor the actual level of the 105 signal in real time.

[0056] Software optimization design: After the main control outputs the bypass switch signal for 10 seconds, it checks whether the IO input level is low at the 12th second. If it is not low, the main control triggers the "slip ring 105 signal short circuit" fault.

[0057] 3) Limit switch 129 signal monitoring

[0058] Monitoring principle: After the wind turbine master controller triggers the brake program for a fault of more than 180 degrees, when the three blades return to the safe position of 92 degrees, the pitch control system outputs a high-level 129 signal to the master controller through the slip ring through hard wiring, notifying the master controller that the three blades have returned to the safe position of 92 degrees. During normal operation or startup of the wind turbine, when the blades leave the 92-degree position, the limit switch signal 129 must become a low level.

[0059] Software optimization design: After the wind turbine is connected to the grid and runs, the 129 signal is monitored in real time. If it is detected that the 129 signal jumps to a high level and remains unchanged after a delay of 100ms, the "slip ring 129 signal short circuit alarm" is triggered. If it is activated 3 times in 24 hours, the main control reports a "slip ring 129 signal short circuit" fault.

[0060] The embodiment of the present invention provides a monitoring method for preventing the failure of rapid pitch retraction of a doubly-fed wind turbine for wind turbine safety. The existing I / O points of the wind turbine controller are utilized to monitor three key signals of the main control and pitch control lines of the variable pitch system. The purpose of preventing the failure of rapid pitch retraction of the doubly-fed wind turbine is achieved through circuit and software optimization.

[0061] Example 1

[0062] A monitoring method for preventing a doubly-fed wind turbine from failing to quickly retract its blades comprises the following steps:

[0063] The control signal of the main control-pitch system is monitored by circuits and software to prevent blade retraction failure accidents caused by slip ring slideway vibration or short circuit.

[0064] Example 2

[0065] Based on Example 1, the circuit includes the following sub-steps:

[0066] The output signals of the master control's fast pitch retraction signal, bypass switch signal and limit switch signal are returned to the master control I / O input terminal through hard wiring, thereby monitoring the three key signals of the master control and pitch control system.

[0067] Example 3

[0068] On the basis of Example 2, Figure 2 As shown, the use of software includes sub-steps:

[0069] Step 1: Rapidly retract the propeller 103 signal monitoring;

[0070] Step 2: bypass switch 105 signal monitoring;

[0071] Step 3: Limit switch 129 signal monitoring.

[0072] Example 4

[0073] On the basis of Example 2, in step 1, the sub-steps are included:

[0074] Step 11: First, perform hardware modification, that is, add a main control IO input port to monitor and feedback the actual level status of the main control fast retracting signal;

[0075] Step 12: Then, in the software optimization settings, after the main control activates the fast propeller retraction signal, delay and check whether the IO input level is low. If it is not low, activate the "slip ring 103 signal short circuit" alarm. After the activation times reaches the set value, the "slip ring 103 signal short circuit" alarm is reported and the machine is shut down.

[0076] Example 5

[0077] On the basis of Example 2, in step 2, the sub-steps are included:

[0078] Step 21: During the fan startup process, the main control outputs a bypass switch signal for a set time. After the set time, the bypass switch signal level is low.

[0079] Step 22: Add a master control IO input port in the hardware modification to monitor and feedback the actual level status of the master control bypass switch signal;

[0080] Step 23: In the software optimization settings, after the master control outputs the bypass switch signal for the set time, check whether the IO input level is low. If it is not low, the master control triggers the "slip ring 105 signal short circuit" fault.

[0081] Example 6

[0082] On the basis of Example 2, in step 3, the sub-steps are included:

[0083] Step 31: After the wind turbine safety chain is triggered, the blade returns to the 92-degree safety position, and the pitch control system outputs a high-level 129 signal to the main control through the slip ring via hard wiring, notifying the main control that the blade has returned to the 92-degree safety position; during normal operation or startup of the wind turbine, after the blade leaves the 92-degree position, the limit switch 129 signal changes to a low level;

[0084] Step 32: In the software optimization settings, after the wind turbine is connected to the grid and running, the 129 signal is monitored in real time. If it is detected that the 129 signal jumps to a high level and remains unchanged for a period of time, the "slip ring 129 signal short circuit alarm" is triggered. After multiple activations, the main control reports a "slip ring 129 signal short circuit" fault.

[0085] Example 7

[0086] Based on Example 4, step 12 is periodically executed to check once during battery detection or, after the blade maintenance switch is actuated, step 12 is automatically executed once when the fan is started for the first time.

[0087] Example 8

[0088] Based on Example 4, in step S12, the number of activations reaches the set value of 3 activations within 24 hours.

[0089] Example 9

[0090] Based on Example 6, in step S32, the multiple activations are performed for three activations within 24 hours.

[0091] Example 10

[0092] A monitoring device for preventing a doubly-fed wind turbine from failing to quickly retract its pitches comprises a main control I / O module, a variable pitch system interface circuit and hard wiring, wherein the hard wiring is used to connect the output signals of the main control's rapid pitch retraction signal, bypass switch signal and 92-degree limit switch signal to the main control I / O input terminal, and execute a monitoring method for preventing a doubly-fed wind turbine from failing to quickly retract its pitches as described in any one of Examples 1 to 9.

[0093] The units involved in the embodiments of the present invention may be implemented by software or hardware, and the units described may also be arranged in a processor. The names of these units do not, in some cases, limit the units themselves.

[0094] According to one aspect of the present application, a computer program product or a computer program is provided, the computer program product or the computer program comprising computer instructions, the computer instructions being stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the methods provided in the above-mentioned various optional implementations.

[0095] As another aspect, the present application also provides a computer-readable medium, which may be included in the electronic device described in the above embodiment; or may exist independently without being assembled into the electronic device. The above computer-readable medium carries one or more programs, and when the above one or more programs are executed by an electronic device, the electronic device implements the method described in the above embodiment.

[0096] The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

[0097] The above technical solution is only one implementation mode of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the application methods and principles disclosed in the present invention, and it is not limited to the method described in the above specific implementation mode of the present invention. Therefore, the method described above is only preferred and does not have a restrictive meaning.

[0098] In addition to the above examples, those skilled in the art may obtain other embodiments based on the above disclosure or by using the knowledge or technology in the relevant field to make changes. The features of each embodiment may be interchangeable or replaced. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A monitoring method for preventing a doubly-fed wind turbine from failing to quickly retract its blades, characterized in that: The following steps are involved: The control signal of the main control-pitch system is monitored by using a circuit and software to prevent the blade retraction failure accident caused by the slip ring slideway jumping or short circuit; the circuit includes sub-steps: The output signals of the master control's fast pitch retraction signal, bypass switch signal and limit switch signal are returned to the master control I / O input terminal through hard wiring, so as to monitor the three key signals of the master control and pitch control system; The utilization software comprises the following sub-steps: Step 1: Rapidly retract the propellers 103 signal monitoring; specifically including: Step 11: First, perform hardware modification, that is, add a main control IO input port to monitor and feedback the actual level status of the main control fast retracting signal; Step 12: Then, in the software optimization settings, after the main control activates the fast propeller retraction signal, delay and check whether the IO input level is low. If it is not low, activate the "slip ring 103 signal short circuit" alarm. After the activation times reach the set value, the "slip ring 103 signal short circuit" alarm will be reported and the machine will be shut down. Step 2: bypass switch 105 signal monitoring; specifically including: Step 21: During the fan startup process, the main control outputs a bypass switch signal for a set time. After the set time, the bypass switch signal level is low. Step 22: Add a master control IO input port in the hardware modification to monitor and feedback the actual level status of the master control bypass switch signal; Step 23: In the software optimization settings, after the master controller outputs the bypass switch signal for the set time, check whether the IO input level is low. If it is not low, the master controller triggers the "slip ring 105 signal short circuit" fault; Step 3: Limit switch 129 signal monitoring; specifically including: Step 31: After the wind turbine safety chain is triggered, the blade returns to the 92-degree safety position, and the pitch control system outputs a high-level 129 signal to the main control through the slip ring via hard wiring, notifying the main control that the blade has returned to the 92-degree safety position; during normal operation or startup of the wind turbine, after the blade leaves the 92-degree position, the limit switch 129 signal changes to a low level; Step 32: In the software optimization settings, after the wind turbine is connected to the grid and running, the 129 signal is monitored in real time. If it is detected that the 129 signal jumps to a high level and remains unchanged for a period of time, the "slip ring 129 signal short circuit alarm" is triggered. After multiple activations, the main control reports a "slip ring 129 signal short circuit" fault.

2. The monitoring method for preventing the failure of rapid pitch retraction of a doubly-fed wind turbine according to claim 1 is characterized in that: During battery testing, perform step 12 regularly or perform step 12 automatically when the fan is started for the first time after the blade maintenance switch is actuated.

3. The monitoring method for preventing the failure of rapid pitch retraction of a doubly-fed wind turbine according to claim 1 is characterized in that: In step S12, the activation times reach the set value of 3 activations within 24 hours.

4. The monitoring method for preventing the failure of rapid pitch retraction of a doubly-fed wind turbine according to claim 1 is characterized in that: In step S32, the multiple activations are performed three times within 24 hours.

5. A monitoring device for preventing a doubly-fed wind turbine from failing to quickly retract its blades, characterized in that: It includes a main control I / O module, a pitch system interface circuit and hard wiring, and the hard wiring is used to connect the output signals of the main control's rapid pitch retraction signal, bypass switch signal and 92-degree limit switch signal to the main control I / O input terminal, and execute the monitoring method for preventing the rapid pitch retraction failure of the doubly fed wind turbine as described in any one of claims 1 to 4.

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