A wind turbine blade de-icing system and method

Abstract

The application belongs to the field of wind power generation, and specifically discloses a wind turbine blade deicing system and method. The blade icing identification system is used to monitor blade icing information, and the monitoring information is sent to the main control unit of the wind turbine. A temperature and humidity meter is used to record the ambient temperature and humidity when the blade is covered with ice, and the recorded data is sent to the main control unit of the wind turbine. The main control unit of the wind turbine is used to control the deicing system to remove the ice. A laser signal meter is used to confirm the position of the blade, and the position information is sent to the main control unit of the wind turbine. The main control unit of the wind turbine is used to control the sound alarm system, the yaw system, the automatic turning system and the brake system to operate. The remote monitoring system is used to observe the deicing condition. Effective measures are taken for the deicing process of the wind turbine blade, so as to ensure the deicing effect, guarantee the safety of the deicing process, ensure the good deicing effect, guarantee the safety of the deicing process, and prevent possible equipment damage and personnel casualties.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of wind power generation, and particularly relates to a wind turbine blade deicing system and method. BACKGROUND

[0002] The blade icing has a huge impact on the operation of the wind turbine, one is to add extra load to the blade, affecting the normal operation of the unit, two is that the ice block falling will greatly increase the safety hazard, and bring possible equipment damage and personal injury. Therefore, under normal circumstances, once the blade icing occurs on the unit without installing the blade deicing device, the unit will stop running until the icing is eliminated, which will cause the loss of power generation. In addition, even if some units are installed with blade deicing devices, the deicing process is not perfect, which will also cause certain safety hazards.

[0003] Now the treatment of the wind turbine blade deicing is more focused on how to remove the ice block, for example, using air heat deicing method or electric heating deicing method. Although these methods can achieve the effect of deicing, the deicing process is often ignored. The wind turbine blade deicing not only removes the icing, but also considers the safety problem, the complete deicing problem, and the problem of whether it can prevent re-icing. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide a wind turbine blade deicing system and method to solve the problem of imperfect deicing process of the existing wind turbine blade and easy to produce safety hazards.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] In a first aspect, the present application provides a wind turbine blade deicing system, comprising: a blade icing recognition system, a temperature and humidity instrument, a laser signal instrument, a sound alarm system, a unit yaw system, an automatic turning system, a brake system, a deicing system, a unit main control and a remote monitoring system.

[0007] The blade icing recognition system is connected with the unit main control and the remote monitoring system, the temperature and humidity instrument and the laser signal instrument are connected with the unit main control, and the sound alarm system, the unit yaw system, the automatic turning system, the brake system and the deicing system are connected with the unit main control and the remote monitoring system.

[0008] Further, the blade icing recognition system transmits the identified blade surface icing information to the unit main control and the remote monitoring system; the temperature and humidity instrument and the laser signal instrument transmit the collected temperature and humidity information and blade position information to the unit main control; the sound alarm system, the unit yaw system, the automatic turning system, the brake system and the deicing system perform corresponding operations according to the instructions issued by the unit main control, and are monitored through the remote monitoring system.

[0009] Further, the blade icing identification system comprises two groups of high-definition cameras, the first group of high-definition cameras is installed at the axial center line of the bottom of the cabin near the impeller position, and the second group of high-definition cameras is installed on the hub cover between every two blades.

[0010] Further, the deicing system receives the instructions of the main control of the unit group, and performs deicing treatment on the blades, and one deicing system is installed on each of the three blades; the deicing system comprises two working states: full-power state and half-power state; the deicing systems arranged on the three blades independently operate.

[0011] Further, the laser signal instrument is installed in the cabin and fixed on the rack.

[0012] Further, the temperature and humidity instrument is installed outside the cabin, and a temperature instrument is installed inside the blade at a position 1 / 3 of the length of the blade from the blade root.

[0013] In a second aspect, the present application provides a wind turbine blade deicing method based on the wind turbine blade deicing system of any one of the above, comprising:

[0014] S1: The blade icing identification system monitors the occurrence of icing on the blade, and sends the monitoring information to the main control of the unit group; the temperature and humidity instrument records the external environment temperature and humidity when the blade icing occurs, and sends the recorded data to the main control of the unit group;

[0015] S2: Enter the deicing program, control the deicing system to deice through the main control of the unit group, confirm the position of the blade through the laser signal instrument, send the position information to the main control of the unit group, and control the sound alarm system, the unit group yaw system, the automatic turning system and the brake system to operate through the main control of the unit group;

[0016] S3: After the deicing program is completed, the unit group resumes operation, and the deicing condition is observed through the remote monitoring system.

[0017] Further, the step S1 specifically comprises:

[0018] When the icing identification is performed through the first group of high-definition cameras, the blade serial number is displayed in the image, and when the unit group is normally operated, the first group of high-definition cameras takes a picture and records once for each trigger of the laser signal instrument;

[0019] When the icing identification is performed through the second group of high-definition cameras, the second group of high-definition cameras is relatively static with the blade, and the icing conditions of the left and right blades are photographed, and the sampling period is set to 10 minutes;

[0020] The temperature and humidity instrument records the external environment temperature T0 and humidity H0 when the blade icing occurs.

[0021] Further, the step S2 specifically comprises:

[0022] S21: the sound alarm system sends an alarm;

[0023] S22: the unit is shut down;

[0024] S23: after the shutdown is completed, the unit yaw system works to rotate the unit to a sector that does not affect the tower bottom box variable device;

[0025] S24: the automatic turning system is started, the impeller is slowly rotated, when the signal of the laser signal instrument triggers, the automatic turning system stops, the brake system is enabled, and the impeller is stopped by the brake system;

[0026] S25: the image of the first group of high-definition cameras is used to identify the blade serial number, the deicing system of the blade is started, and the deicing system is operated in a full-power state;

[0027] S26: the deicing situation is judged through the image of the second group of high-definition cameras and the record of the blade internal temperature instrument; the remote monitoring system observes the deicing situation through the images presented by the first group of high-definition cameras and the second group of high-definition cameras;

[0028] S27: after the deicing of the blade is completed, to prevent re-icing, the deicing system of the blade is operated in a half-power state; the temperature T1 of the blade at this time is recorded;

[0029] S28: the brake system releases the brake, and the deicing work of the remaining blades is continued through repeating steps S24-S28.

[0030] Further, the step S3 specifically comprises:

[0031] S31: the deicing program is completed, and the sound alarm system is released;

[0032] S32: the unit exits the deicing program and returns to a normal operation state;

[0033] S33: the deicing system is kept in a half-power state, and if T1 decreases by 5℃ or more, the full-power operation state is started;

[0034] S34: the changes of the external environment temperature T0 and the humidity H0 are observed, the critical temperature at the time of icing is recorded as Ts, the critical humidity is recorded as Hs, and when T0>Ts, or H0<Hs, or both, the deicing system stops working, and the unit normally generates electricity.

[0035] The present application has at least the following beneficial effects:

[0036] 1、The present application monitors the blade icing information through the blade icing identification system, sends the monitoring information to the unit main control, records the external environment temperature and humidity when the blade appears icing through the temperature and humidity instrument, sends the recorded data to the unit main control, controls the deicing system to deice through the unit main control, confirms the blade position through the laser signal instrument, sends the position information to the unit main control, controls the sound alarm system, the unit yaw system, the automatic turning system and the brake system to run through the unit main control, observes the deicing condition through the remote monitoring system, adopts effective measures for the wind turbine blade deicing process, guarantees the deicing effect, at the same time, guarantees the safety of the deicing process, ensures that the deicing effect is good, the deicing process is safe and guaranteed, and equipment damage and personnel casualties caused by the deicing process are prevented.

[0037] 2、The present application sets multiple groups of high-definition cameras to guarantee the accuracy of the blade icing identification, reasonably arranges the temperature and humidity instrument to comprehensively and accurately master the external environment and the blade inside, and increases the sound alarm system to remind the surrounding personnel to keep away from the wind turbine to prevent ice block drop from causing personal injury accidents.

[0038] 3、In the deicing process, the yaw system unit is adjusted to the direction without other equipment, so that damage to ground equipment is prevented, two-stage deicing states are set to reduce power consumption, and even if the deicing is completed, the deicing system is still kept in a working state to prevent re-icing. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the application and are incorporated herein in conjunction with the description of the application. The embodiments of the present application, together with its features and its description, are used to explain the application and are not intended to limit the application. In the drawings:

[0040] Figure 1 It is a structure schematic diagram of a wind turbine blade deicing system.

[0041] Figure 2 It is a first group of high-definition camera installation schematic diagram.

[0042] Figure 3 It is a second group of high-definition camera installation schematic diagram.

[0043] Figure 4 It is a front view of the laser signal instrument installation.

[0044] Figure 5 It is a side view of the laser signal instrument installation. DETAILED DESCRIPTION

[0045] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0046] The following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used with respect to the exemplary embodiments of the present application is used only to describe particular embodiments and is not intended to limit the scope of the example embodiments of the present application.

[0047] Embodiment 1

[0048] As shown in Figure 1 , a wind turbine blade deicing system includes: a blade icing identification system, a temperature and humidity instrument, a laser signal instrument, a sound alarm system, a unit yaw system, an automatic turning system, a brake system, a deicing system, a unit main control and a remote monitoring system; the blade icing identification system is connected with the unit main control and the remote monitoring system, and sends the identified blade surface icing information to the unit main control and the remote monitoring system; the temperature and humidity instrument and the laser signal instrument are connected with the unit main control, and send the collected temperature and humidity information and blade position information to the unit main control; the sound alarm system, the unit yaw system, the automatic turning system, the brake system and the deicing system are all connected with the unit main control, and perform corresponding operations according to the instructions issued by the unit main control; the sound alarm system, the unit yaw system, the automatic turning system, the brake system and the deicing system are also connected with the remote monitoring system, and are monitored through the remote monitoring system.

[0049] As shown in Figure 2 and Figure 3 , the blade icing identification system identifies the blade surface icing condition through a high-definition camera, and sends relevant information to the unit main control and the remote monitoring system; the blade icing identification system includes two groups of high-definition cameras, the first group of high-definition cameras is installed at the bottom of the cabin axial center line near the impeller position (the specific position is determined according to the image presentation condition to ensure that the whole blade is as much as possible to be photographed); the second group of high-definition cameras is installed on the hub cover, between every two blades, the lens direction can be adjusted, and the blade icing condition on the left and right sides can be photographed, and a total of three are installed.

[0050] The deicing system receives the instructions of the unit main control to perform deicing treatment on the blade, and one deicing system is installed on each of the three blades; the deicing system is an execution mechanism for deicing, and has two working states, one is full power state, and the other is half power state; the deicing systems arranged on the three blades can be independently operated, that is, they can be individually turned on, and they do not have to be turned on and turned off at the same time; the deicing system is not limited to air heating, electric heating and other deicing methods;

[0051] As shown in Figures 4-5The laser signal instrument is shown to be installed in the cabin and fixed on the frame. The position of the reflection strip is offset from the blade by a certain angle. If the angle is consistent with the blade, the laser signal instrument is just at the position of the main shaft, which is inconvenient for installation and is not conducive to the realization of its functions. The laser signal instrument is used to determine the position of the blade and facilitate the deicing process.

[0052] The automatic turning system can drive the impeller to rotate at a low speed to adjust the blade to the required position.

[0053] The temperature and humidity instrument is used to monitor the temperature and humidity of the external environment. The temperature and humidity instrument is installed outside the cabin. In addition, inside the blade, at a distance of 1 / 3 of the blade length from the blade root (which can be determined according to the actual situation of the blade), and near the non-deicing system, a temperature instrument is also installed to indirectly monitor the temperature of the blade.

[0054] The sound alarm system will issue an alarm when the unit is deicing, reminding personnel around the unit to stay away from the unit to prevent personal injury accidents;

[0055] The yaw system of the unit adjusts the direction of the cabin to prevent damage to the box transformer and power transmission pole at the bottom of the tower caused by falling ice during deicing;

[0056] The brake system stops the rotation of the impeller in time when the impeller rotates to the corresponding position;

[0057] The unit main control receives the signal of the ice recognition system and makes the unit enter the deicing program to control the entire deicing process;

[0058] The remote monitoring system receives the image of the ice recognition system and the related signal of the unit main control to make a judgment and observation on the icing condition of the blade.

[0059] Embodiment 2

[0060] A wind turbine blade deicing method, comprising:

[0061] S1: The blade icing recognition system monitors the occurrence of icing on the blade and sends the monitoring information to the unit main control. The temperature and humidity instrument records the temperature and humidity of the external environment when the blade icing occurs and sends the recorded data to the unit main control;

[0062] When the icing recognition is performed by the first set of high-definition cameras, the serial number of the blade at the root of the blade is displayed in the image, and when the deicing program is entered, the deicing system corresponding to the blade is opened; when the unit is normally operated, the first set of high-definition cameras takes a picture once for every trigger of the laser signal instrument, so that the image entering the lens can more completely represent the surface condition of the blade; or, when the deicing program is entered (only when the deicing program is entered, this function works), the automatic turning system is stopped and the brake system is enabled for every trigger of the laser signal instrument, so that the blade is fixed. At this time, the photographing function also works, and the current position can be recorded as the number of the blade.

[0063] When the icing recognition is performed by the second set of high-definition cameras, the second set of high-definition cameras is relatively static with the blade, and the icing conditions of the blades on the left and right sides are photographed, and the sampling period is set to 10 minutes, that is, a picture is taken once every 10 minutes.

[0064] The external environment temperature T0 and humidity H0 when the blade appears icing are recorded by the temperature and humidity instrument.

[0065] The icing conditions of the blade can be recognized by the photographing results of the above two sets of high-definition cameras.

[0066] S2: Enter the deicing program, control the deicing system by the unit main control, confirm the blade position by the laser signal instrument, send the position information to the unit main control, and control the sound alarm system, unit yaw system, automatic turning system and brake system to operate by the unit main control;

[0067] S21: The sound alarm system issues an alarm to remind the surrounding personnel to stay away from the machine;

[0068] S22: The unit is stopped;

[0069] S23: After the stop is completed, the unit yaw system works to rotate the unit to a sector that does not affect the tower bottom box and other equipment, to prevent the falling ice from damaging the equipment;

[0070] S24: The automatic turning system is started, the impeller is slowly rotated, and when the signal of the laser signal instrument is triggered, the automatic turning system is stopped and the brake system is enabled to stop the rotation of the impeller;

[0071] S25: The image of the first set of high-definition cameras is used to identify the number of the blade, and the deicing system of the blade is opened and operated in full power state;

[0072] S26: The deicing condition is judged by the image of the second set of high-definition cameras and the record of the blade temperature instrument; the remote monitoring system observes the deicing condition through the images presented by the first set of high-definition cameras and the second set of high-definition cameras;

[0073] S27: After the branch blade deicing is completed, to prevent re-icing, the deicing system of the branch blade is operated in a half-power state; the temperature T1 in the blade at this time is recorded;

[0074] S28: The brake system releases the brake, and steps S24-S28 are repeated to continue deicing the remaining blades.

[0075] S3: After the deicing program is completed, the unit resumes operation, and the deicing condition is observed through the remote monitoring system;

[0076] S31: The deicing program is completed, and the sound alarm system is released;

[0077] S32: The unit exits the deicing program and resumes normal operation;

[0078] S33: The deicing system remains in a half-power state, and if T1 decreases significantly (5℃ or more, an empirical value), full-power operation is required;

[0079] S34: The changes in the external environment temperature T0 and humidity H0 are observed, the critical temperature at the time of icing is recorded as Ts, and the critical humidity is recorded as Hs; when T0>Ts, or H0<Hs, or both, the deicing system stops working, and the unit normally generates electricity.

[0080] From the technical common sense, the application can be realized by other embodiments without departing from the spirit or essential characteristics. Therefore, the above disclosed embodiments are only examples and are not the only ones. All changes within the scope of the application or within the scope equivalent to the application are included in the application.

[0081] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the application and not to limit it, although the application has been described in detail with reference to the above examples, those skilled in the art should understand that: the specific embodiments of the application can still be modified or replaced, without departing from the spirit and scope of the application, any modification or equivalent replacement, which should be included in the protection scope of the claims of the application.

Claims

1. A method of de-icing a wind turbine blade, characterized in that, The application discloses a wind turbine blade deicing system and a wind turbine blade deicing method. The blade icing identification system is connected with the main control and remote monitoring system of the wind turbine, the temperature and humidity meter and the laser signal instrument are connected with the main control of the wind turbine, and the sound alarm system, the yaw system, the automatic unloading system, the brake system and the deicing system are connected with the main control and the remote monitoring system of the wind turbine. The blade icing identification system comprises two groups of high-definition cameras, the first group of high-definition cameras is installed at the bottom of the cabin and close to the impeller along the axial center line, and the second group of high-definition cameras is installed on the hub cover and between every two blades. The wind turbine blade deicing method comprises the following steps. S1: The blade icing identification system monitors the icing of the blades and sends the monitoring information to the main control of the wind turbine; the temperature and humidity meter records the ambient temperature and humidity when the blades are iced and sends the recorded data to the main control of the wind turbine. S2: The deicing program is entered, the deicing system is controlled by the main control of the wind turbine to perform deicing, the position of the blades is confirmed by the laser signal instrument and the position information is sent to the main control of the wind turbine, and the sound alarm system, the yaw system, the automatic unloading system and the brake system are controlled by the main control of the wind turbine to operate. S3: After the deicing program is completed, the wind turbine is restored to operation, and the deicing condition is observed by the remote monitoring system. The step S1 specifically comprises the following steps. When the icing is identified by the first group of high-definition cameras, the blade serial number is displayed in the image, and when the wind turbine is normally operated, the first group of high-definition cameras takes a picture and records once every time the laser signal instrument is triggered. When the icing is identified by the second group of high-definition cameras, the second group of high-definition cameras are relatively static relative to the blades, the icing conditions of the blades on the left and right sides are photographed, and the sampling period is set to 10 minutes. The temperature and humidity meter records the ambient temperature T0 and humidity H0 when the blades are iced. The step S2 specifically comprises the following steps. S21: The sound alarm system issues an alarm. S22: The wind turbine is stopped. S23: After the stopping is completed, the yaw system works to rotate the wind turbine to a sector that does not affect the tower bottom box transformer equipment. S24: The automatic unloading system is started, the impeller is slowly rotated, the automatic unloading system is stopped when the signal of the laser signal instrument is triggered, and the brake system is enabled to stop the rotation of the impeller. S25: The blade serial number is identified by the image of the first group of high-definition cameras, the deicing system of the blade is started, and the deicing system is operated in a full-power state. S26: The deicing condition is judged by the image of the second group of high-definition cameras and the record of the blade internal temperature instrument, and the remote monitoring system observes the deicing condition by the images presented by the first group of high-definition cameras and the second group of high-definition cameras. S27: After the deicing of the blade is completed, the deicing system of the blade is operated in a half-power state to prevent re-icing, and the temperature T1 of the blade at this time is recorded. S28: The brake system is released, and the steps S24-S28 are repeated to continue the deicing work of the remaining blades.

2. A method of de-icing a wind turbine blade according to claim 1, characterised in that, The step S3 specifically comprises the following steps. S31: the deicing program is completed, and the sound alarm system is released; S32: the unit exits the deicing program and returns to the normal operation state; S33: the deicing system remains in the half-power state and operates, and if T1 drops by 5 DEG C or more, the full-power operation state is started; S34: the changes of the external environment temperature T0 and humidity H0 are observed, the critical temperature at the time of icing is recorded as Ts, the critical humidity is recorded as Hs, and when T0>Ts or H0 3. A method of de-icing a wind turbine blade according to claim 1, wherein, The laser signal instrument is installed in the cabin and fixed on the rack.

4. A method of de-icing a wind turbine blade according to claim 1, wherein, The temperature and humidity instrument is installed outside the cabin, and the temperature instrument is installed inside the blade at a distance of 1 / 3 of the blade length from the blade root.

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