A Blade Imbalance Fault Diagnosis Device and Method for a Wind Turbine

Abstract

A blade imbalance fault diagnosis device and method for a wind turbine provided by the present invention include a laser area acquisition unit and a signal receiving display screen. Among them, the laser area acquisition unit is used to acquire the laser area corresponding to each blade within a set rotation period; the signal receiving display screen is used to determine whether the corresponding blade is balanced according to the received laser area corresponding to each blade. The diagnosis device and method of the present invention are simple and effective, and can improve the accuracy of blade fault detection.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine units, and particularly relates to a device and method for diagnosing blade imbalance faults of wind turbine units. Background Art

[0002] A wind power generation power supply consists of a wind turbine unit, a tower for supporting the generator set, a battery charging controller, an inverter, a load unloader, a grid connection controller, a battery pack, a wind power flange, etc.; the wind turbine unit includes a wind wheel and a generator; the wind wheel consists of blades, a hub, reinforcement members, etc.; it has functions such as the blades rotating by the wind force to generate electricity and the generator head rotating. Wind speed selection: A low-wind-speed wind turbine can effectively improve the utilization of wind energy in low-wind-speed areas.

[0003] However, the existing imbalance detection methods are relatively complex, not comprehensive and effective. A single detection may not be able to detect the problem, resulting in inaccurate fault detection. To solve the above problems, we propose a method for diagnosing blade imbalance faults of wind turbine units. Summary of the Invention

[0004] The purpose of the present invention is to provide a device and method for diagnosing blade imbalance faults of wind turbine units, which solve the above-mentioned deficiencies in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A device for diagnosing blade imbalance faults of a wind turbine unit provided by the present invention includes a laser area acquisition unit and a signal receiving display screen. Among them, the laser area acquisition unit is used to acquire the laser area corresponding to each blade within a set rotation period; the signal receiving display screen is used to determine whether the corresponding blade is balanced according to the received laser area corresponding to each blade.

[0007] Preferably, the laser area acquisition unit includes a laser synchronous transmitter, a laser receiver, and a fan blade rotation cycle recorder. Among them, the laser synchronous transmitter, the laser receiver, and the fan blade rotation cycle recorder are all connected to the signal receiving display screen; the laser synchronous transmitter is used to emit laser signals; the laser receiver is used to receive laser signals and transmit the received laser signals to the signal receiving display screen; the fan blade rotation cycle recorder is used to obtain the rotation cycles of the blades and transmit them to the signal receiving display screen; the signal receiving display screen is used to control the start and stop of the laser synchronous transmitter, the laser receiver, and the fan blade cycle recorder. At the same time, it determines whether the blade is in an unbalanced state according to the received laser signals and the rotation cycles of the blades.

[0008] Preferably, three laser synchronization transmitters are provided, and the three laser synchronization transmitters are respectively installed on three blades, and the installation positions of the three laser synchronization transmitters are the same.

[0009] Preferably, the laser receiver is installed on the tower barrel.

[0010] Preferably, the fan blade rotation cycle recorder is installed on the central axis of the blade.

[0011] Preferably, the signal receiving display screen is further connected to a wind axis detection device for obtaining the horizontal verticality of the wind axis, and the wind axis detection device is installed on the wind axis.

[0012] A method for diagnosing the imbalance fault of the blades of a wind turbine, comprising the following steps:

[0013] Obtain the laser area region emitted by each laser transmitter received by the laser receiver within a single rotation period;

[0014] Judge whether the corresponding blade is balanced according to the laser area region corresponding to each blade received.

[0015] Preferably, judging whether the corresponding blade is balanced according to the laser area region corresponding to each blade received, the specific method is:

[0016] When the laser area region corresponding to each blade is greater than or equal to two-thirds of the area region of the circle, the blade is in a balanced state;

[0017] When the laser area region corresponding to each blade is less than or equal to one-third of the area region of the circle, the blade is in an unbalanced state.

[0018] Preferably, when the laser area acquisition unit stops running, obtain the horizontal verticality of the wind axis;

[0019] Judge whether the blade is balanced according to the obtained horizontal verticality.

[0020] Preferably, judging whether the blade is balanced according to the obtained horizontal verticality, the specific method is:

[0021] If the horizontal verticality of the wind axis is in a stable state within a single rotation period, the blade is in a balanced state; otherwise, the blade is in an unbalanced state.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] A device for diagnosing the imbalance fault of the blades of a wind turbine provided by the present invention, through the provided laser synchronization transmitter and laser receiver, can receive and detect signals of different receiving areas, and then reflect whether the blade is balanced. The diagnosis device and method of the present invention are simple and effective.

[0024] Furthermore, through the provided wind axis detection device, it is possible to detect whether the wind axis is balanced and also reflect the state of the wind blades. The two set detection positions can make the detection more comprehensive and effective, avoiding the situation where a single detection may not detect a problem, resulting in inaccurate fault detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall process of the present invention;

[0026] Figure 2 It is a schematic diagram of the regional area of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In addition, in the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0029] A blade imbalance fault diagnosis device for a wind turbine provided by the present invention includes a laser synchronization transmitter, a laser receiver, a fan blade rotation cycle recorder, and a signal receiving display screen. Among them, the laser synchronization transmitter, the laser receiver, and the fan blade rotation cycle recorder are all connected to the signal receiving display screen.

[0030] The laser synchronization transmitter is used to emit laser signals; there are three of them, and the three laser synchronization transmitters are respectively installed on three blades, and the installation positions of the three laser synchronization transmitters are the same.

[0031] The laser receiver is installed on the tower barrel and is used to receive the laser signal and transmit the received laser signal to the signal receiving display screen.

[0032] The fan blade rotation cycle recorder is installed on the blade central axis and is used to obtain the rotation cycles of the blade and transmit them to the signal receiving display screen.

[0033] The signal receiving display screen is used to control the start and stop of the laser synchronization transmitter, the laser receiver, and the fan blade rotation counter. At the same time, it calculates the area region according to the received laser signal, and determines the rotation period according to the number of rotations of the blade; furthermore, it judges whether the blade is in an unbalanced state according to the area region and the rotation period.

[0034] The signal receiving display screen is also connected to a wind axis detection device, and the wind axis detection device is installed on the wind axis; it is used to obtain the horizontal verticality of the wind axis.

[0035] The signal receiving display screen is used to judge whether the blade is in an unbalanced state according to the received horizontal verticality of the wind axis.

[0036] Please refer to Figure 1-2 , a method for diagnosing blade imbalance faults of a wind turbine provided by the present invention includes the following steps:

[0037] Install a laser synchronization transmitter:

[0038] Furthermore, the laser synchronization transmitter is installed at the same position of the three blades. The laser synchronization transmitter is electrically connected to the signal receiving display screen, and a laser receiver is installed on one side of the tower barrel. The laser receiver can receive the signal emitted by the laser synchronization transmitter and transmit the received laser signals of different areas to the signal receiving display screen.

[0039] Install a fan blade rotation counter:

[0040] Furthermore, the fan blade rotation counter is installed on the central axis of the fan blade, and the fan blade rotation counter is electrically connected to the signal receiving display screen.

[0041] Determine the rotation period:

[0042] Furthermore, taking 10,000 circles as a rotation period, and it is used to record the area region of the laser received by the laser receiver from the laser transmitter within a single period;

[0043] The area region is divided into three levels. The first level is the full area of the circle, denoted as 1, the second level is two-thirds of the area of the circle, denoted as 2, and the third level is one-third of the area of the circle, denoted as 3.

[0044] Signal reception;

[0045] Furthermore, when the fan blade rotates, the laser synchronization transmitter and the laser receiver are started simultaneously. When the fan blade rotates continuously, the laser signal emitted by the laser synchronization transmitter rotates with the rotation of the fan blade. When it passes through the laser receiver, the signal is received by the laser receiver.

[0046] Draw a coordinate system;

[0047] Further, taking the period as the X-axis and the receiving area as the Y-axis, corresponding the receiving area within a single period to corresponding numbers and making an image;

[0048] If the area region received within a single period is at level 1, it can be considered that the fan blade is basically in a balanced state;

[0049] On the contrary, when the area regions within several single periods received present a broken line with an inclination angle greater than 45 degrees in the image, it can be considered that the fan blade is in an unbalanced state.

[0050] Install a wind axis detection device;

[0051] Further, fixedly install a wind axis detection device on the wind axis, detect the horizontal verticality of the wind axis within a single period, record the change of its horizontal verticality when the fan blade rotates, and make an image;

[0052] If the horizontal verticality of the wind axis detected within a single period is basically in a stable state, the wind axis is in a normal state, that is, the fan blade is in a balanced state; on the contrary, it is in an unbalanced state.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A blade imbalance fault diagnosis device for a wind turbine, characterized in that, It includes a laser area acquisition unit and a signal receiving display screen. Among them, the laser area acquisition unit is used to acquire the laser area corresponding to each blade within a set rotation period; the signal receiving display screen is used to determine whether the corresponding blade is balanced according to the received laser area corresponding to each blade; the laser area acquisition unit includes a laser synchronous transmitter, a laser receiver, and a fan blade rotation cycle recorder. Among them, the laser synchronous transmitter, the laser receiver, and the fan blade rotation cycle recorder are all connected to the signal receiving display screen; the laser synchronous transmitter is used to emit laser signals; the laser receiver is used to receive laser signals and transmit the received laser signals to the signal receiving display screen; the fan blade rotation cycle recorder is used to obtain the rotation cycle of the blade and transmit it to the signal receiving display screen; the signal receiving display screen is used to control the start and stop of the laser synchronous transmitter, the laser receiver, and the fan blade cycle recorder. At the same time, it calculates the area according to the received laser signal, and determines the rotation period according to the rotation cycle of the blade; and then determines whether the blade is in an unbalanced state according to the area and the rotation period; there are three laser synchronous transmitters, and the three laser synchronous transmitters are respectively installed on three blades, and the installation positions of the three laser synchronous transmitters are the same; the laser receiver is installed on the tower barrel.

2. The blade imbalance fault diagnosis device for a wind turbine unit according to claim 1, characterized in that, The fan blade rotation cycle recorder is installed on the central axis of the blade.

3. The blade imbalance fault diagnosis device for a wind turbine unit according to claim 1, characterized in that, The signal receiving display screen is also connected to a wind axis detection device for obtaining the horizontal verticality of the wind axis, and the wind axis detection device is installed on the wind axis.

4. A method for diagnosing blade imbalance faults of a wind turbine, characterized in that, Based on the diagnostic device described in claim 1, it includes the following steps: Obtain the laser area received by the laser receiver from each laser transmitter within a single rotation period. Determine whether the corresponding blade is balanced according to the received laser area corresponding to each blade.

5. The blade imbalance fault diagnosis method of a wind turbine unit according to claim 4, characterized in that, Determine whether the corresponding blade is balanced according to the received laser area corresponding to each blade. The specific method is: When the laser area corresponding to each blade is greater than or equal to two-thirds of the area of the circle, then the blade is in a balanced state; When the laser area corresponding to each blade is less than or equal to one-third of the area of the circle, then the blade is in an unbalanced state.

6. The blade imbalance fault diagnosis method of a wind turbine according to claim 4, characterized in that When the laser area acquisition unit stops running, obtain the horizontal verticality of the wind axis; Determine whether the blade is balanced according to the obtained horizontal verticality.

7. A method for diagnosing blade imbalance faults of a wind turbine according to claim 6, characterized in that, Determine whether the blade is balanced according to the obtained horizontal verticality. The specific method is: If the horizontal verticality of the wind axis is in a stable state within a single rotation period, then the blade is in a balanced state; otherwise, the blade is in an unbalanced state.

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