Wind turbine blade deicing system and blade deicing control method

Abstract

The present application provides a wind turbine blade deicing system and a blade deicing control method, which relate to the technical field of wind power generation. The present application connects the first air inlet of the air extraction unit to the outside of the wind turbine generator set through a first air valve to extract cold air outside the unit, and at the same time connects the second air inlet of the air extraction unit to the outlet of the gas return cavity inside the blade of the wind turbine generator set through a second air valve and a first ventilation component to extract the return air circulating in the cavity, and then connects the outlet of the air extraction unit to the closed chamber of the generator of the wind turbine generator set, and uses the second ventilation component to connect the closed chamber of the generator and the air inlet of the gas return cavity, so that the extracted air is injected into the closed chamber of the generator to absorb heat and then injected into the gas return cavity to de-ice the blades, thereby collecting the heat dissipated by the generator through the internal circulation of air for de-icing, and adjusting the internal circulation air volume to ensure that the temperature of the hot air flow is controllable.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and in particular to a wind turbine blade deicing system and a blade deicing control method. Background Art

[0002] With the continuous development of science and technology, the energy share and energy status of wind power generation technology have been continuously improved. With the continuous development of wind resources, more and more wind turbines are installed in low-wind-speed mountainous areas prone to ice formation, which makes the blades of wind turbines prone to ice formation during winter operation, which can easily affect the aerodynamic characteristics of the blades and reduce the power generation efficiency of the unit. In severe cases, it will cause shutdown. At the same time, the unevenness of ice coverage will increase the unbalanced load of the impeller and affect the operating life of the unit; the ice shedding phenomenon during the operation of the wind turbine will also seriously endanger personal and property safety. Therefore, wind turbine blade deicing technology has become an important part of wind power generation technology.

[0003] At present, conventional wind turbine blade deicing solutions usually require the installation of an additional heating device, and the blade surface is deiced by hot air blowing or electric heating through the heating device. It is worth noting that this blade deicing solution often reduces the operating reliability of the wind turbine, requires additional energy consumption, has a high overall cost, and the deicing effect is uncontrollable. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a wind turbine blade de-icing system and a blade de-icing control method, which can collect the heat dissipated by the generator through internal air circulation for de-icing, which is beneficial to the efficient de-icing of the unit blades, and can adjust the internal circulation air volume during the de-icing process to ensure that the temperature of the hot air flow is controllable, and can realize dynamic de-icing of the unit blades under different ice coating thicknesses and operating conditions, thereby reducing the de-icing cost while improving the controllability of the de-icing effect.

[0005] In order to achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0006] In a first aspect, the present application provides a wind turbine blade deicing system, the deicing system comprising an air extraction unit, a first air valve, a second air valve, a first ventilation assembly, and a second ventilation assembly;

[0007] The first air inlet of the air extraction unit is connected to the outside of the wind turbine generator set through the first air valve, and is used to extract cold air outside the wind turbine generator set;

[0008] The second air inlet of the air extraction unit is connected to the air outlet of the gas return cavity inside the blade of the wind turbine generator set through the second air valve and the first ventilation component, so as to extract the return air circulating in the gas return cavity;

[0009] The air outlet of the air extraction unit is in communication with the generator sealed chamber of the wind turbine generator set, and is used to inject the extracted air into the generator sealed chamber for heat absorption;

[0010] The second ventilation component is connected to the air inlet of the generator closed chamber and the gas return chamber, and is used to input the hot air in the generator closed chamber into the gas return chamber to de-ice the blades.

[0011] In an optional embodiment, the deicing system further includes a temperature detection unit, a wheel hub speed detection unit, an ice detection unit and a deicing control unit;

[0012] The ice detection unit is used to detect the actual ice thickness of the outer surface of the blade of the wind turbine generator set;

[0013] The temperature detection unit is used to detect the cold air temperature at the first air inlet and the return air temperature at the second air inlet;

[0014] The hub speed detection unit is used to detect the current actual hub speed of the wind turbine generator set;

[0015] The de-icing control unit is electrically connected to the temperature detection unit, the ice detection unit, the first air valve, the second air valve, the hub speed detection unit and the air extraction unit, and is used to control the respective operating conditions of the first air valve, the second air valve and the air extraction unit according to the actual ice thickness, the cold air temperature, the return air temperature and the actual hub speed, so as to de-ice the outer surface of the blades of the wind turbine.

[0016] In an optional embodiment, the de-icing system further includes a gas pressure relief valve;

[0017] The gas pressure relief valve is connected to the first ventilation component and the outside of the wind turbine generator set, and is used to balance the gas pressure in the gas return cavity when the return air is mixed with the cold air.

[0018] In an optional embodiment, the first ventilation assembly includes a multi-way rotary joint, a second connecting pipe and a plurality of first connecting pipes;

[0019] One end of each of the first connecting pipes is connected to an air outlet of a gas return cavity inside a blade of the wind turbine generator set, and the other end of each of the first connecting pipes is connected to an air inlet of the multi-way rotary joint;

[0020] The multi-way rotary joint is fixedly mounted inside the hub of the wind turbine generator set, and the air outlet of the multi-way rotary joint is connected to one end of the second connecting pipe, wherein the multi-way rotary joint can rotate relative to the second connecting pipe;

[0021] The other end of the second connecting pipe is communicated with the second air inlet of the air extraction unit through the second air valve.

[0022] In an optional embodiment, the second ventilation assembly includes a ventilation adapter plate, an annular adapter cover, and a plurality of third connecting pipes;

[0023] The ventilation adapter plate and the annular adapter cover are arranged between the generator side cover and the hub shell of the wind turbine generator set, the annular adapter cover is mounted on the hub shell, and the ventilation adapter plate is mounted on the generator side cover;

[0024] The annular extension of the ventilation adapter plate is provided with a first annular groove; the annular adapter cover is provided with a second annular groove matching the annular extension, and when the annular extension extends into the second annular groove, the first annular groove cooperates with the second annular groove to form a ventilated closed cavity;

[0025] The bottom of the first annular groove is provided with an air guide port connected to the closed chamber of the generator, and the bottom of the second annular groove is provided with a plurality of ventilation ports;

[0026] One end of each of the third connecting pipes is communicated with an air inlet of a gas reflow cavity inside a blade of the wind generator set, and the other end of each of the third connecting pipes is communicated with a vent of the second annular groove.

[0027] In an optional embodiment, the air extraction unit includes a centrifugal fan and a three-way pipe;

[0028] The first interface of the three-way pipe is connected to the first air valve, so that the first interface serves as the first air inlet of the air extraction unit;

[0029] The second interface of the three-way pipe is connected to the second air valve, so that the second interface serves as the second air inlet of the air extraction unit;

[0030] The air inlet of the centrifugal fan is connected to the third interface of the three-way pipe, so that the air outlet of the centrifugal fan is used as the air outlet of the air extraction unit.

[0031] In a second aspect, the present application provides a blade deicing control method, which is applied to the wind turbine blade deicing system described in any one of the aforementioned embodiments, and the control method includes:

[0032] Acquire the current actual ice thickness of the outer surface of the blade of the wind turbine generator set, the current actual hub speed of the wind turbine generator set, and the current cold air temperature of the first air inlet and the current return air temperature of the second air inlet of the air extraction unit;

[0033] Calculating, according to the actual ice thickness, an air temperature limit value of the air currently extracted by the air extraction unit when injected into the generator closed chamber of the wind turbine generator set;

[0034] Calculating, according to the air temperature limit value and the actual wheel hub speed, the expected air temperature of the air currently extracted by the air extraction unit when injected into the closed chamber of the generator;

[0035] Calculating a first desired air volume ratio of the first air valve relative to the air extraction unit and a second desired air volume ratio of the second air valve relative to the air extraction unit according to the desired air temperature, the cold air temperature and the return air temperature;

[0036] The operating conditions of the first air valve, the second air valve and the air extraction unit are adjusted according to the first desired air volume ratio and the second desired air volume ratio.

[0037] In an optional embodiment, the numerical value of the air temperature limit value of the air injected into the closed chamber of the generator is positively correlated with the thickness of ice on the outer surface of the blade of the wind turbine generator set.

[0038] In an optional embodiment, the expected air temperature of the air injected into the closed chamber of the generator is obtained by multiplying the air temperature limit value by the temperature coefficient corresponding to the actual hub speed, wherein the magnitude of the temperature coefficient is inversely correlated with the magnitude of the actual hub speed.

[0039] In an optional implementation manner, the calculation formulas for the first desired air volume ratio and the second desired air volume ratio are expressed by the following formula:

[0040]

[0041] Among them, T target It is used to represent the desired air temperature of the air extracted by the air extraction unit and injected into the closed chamber of the generator, T genIt is used to indicate the current return air temperature of the second air inlet of the air extraction unit, T air It is used to indicate the current cold air temperature of the first air inlet of the air extraction unit, L fan It is used to represent the expected ventilation volume of the air extraction unit for the generator closed chamber, L gen It is used to indicate the expected ventilation volume of the return air at the second air valve, L air It is used to represent the expected ventilation volume of cold air at the first air valve, P gen It is used to represent the second desired air volume ratio of the second air valve to the air extraction unit, P air Used to indicate a first desired air volume ratio of the first air valve relative to the air extraction unit.

[0042] In this case, the beneficial effects of the embodiments of the present application include the following:

[0043] In the present application, the first air inlet of the air extraction unit is connected to the outside of the wind turbine generator set through the first air valve to extract the cold air outside the wind turbine generator set, and at the same time, the second air inlet of the air extraction unit is connected to the air outlet of the gas return cavity inside the blades of the wind turbine generator set through the second air valve and the first ventilation component to extract the return air circulating in the gas return cavity, and then the air outlet of the air extraction unit is connected to the closed chamber of the generator of the wind turbine generator set to inject the extracted air into the closed chamber of the generator for heat absorption. The second ventilation component between the closed chamber of the generator and the air inlet of the gas return chamber inputs the hot air in the closed chamber of the generator into the gas return chamber for de-icing the blades, thereby collecting the heat dissipated by the generator through internal circulation of air for de-icing, which is beneficial to efficient de-icing of the blades of the unit, and the air extraction unit, the first air valve and the second air valve can be used to adjust the internal circulation air volume during the de-icing process to ensure that the temperature of the hot air flow is controllable, and dynamic de-icing of the blades of the unit can be achieved under different ice coating thicknesses and operating conditions, thereby reducing the de-icing cost while improving the controllability of the de-icing effect.

[0044] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1One of the schematic diagrams of the system composition of the wind turbine blade deicing system provided in the embodiment of the present application;

[0047] Figure 2 A second schematic diagram of the system composition of the wind turbine blade deicing system provided in an embodiment of the present application;

[0048] Figure 3 A schematic diagram of the structure of the ventilation adapter plate provided in an embodiment of the present application;

[0049] Figure 4 A schematic diagram of the structure of the annular adapter cover provided in an embodiment of the present application;

[0050] Figure 5 for Figure 1 An enlarged schematic diagram of the view of part I in FIG.

[0051] Figure 6 A schematic flow chart of a blade deicing control method provided in an embodiment of the present application.

[0052] Icons: 10-wind turbine blade deicing system; 11-air extraction unit; 12-first air valve; 13-second air valve; 14-first ventilation assembly; 15-second ventilation assembly; 16-temperature detection unit; 17-hub speed detection unit; 18-icing detection unit; 19-deicing control unit; 21-wind turbine nacelle; 22-blades; 221-gas return chamber; 23-hub; 24-generator closed chamber; 20-gas pressure relief valve; 141-multi-way rotary joint; 142-first connecting pipe; 143-second connecting pipe; 151-ventilation adapter plate; 152-annular adapter cover; 153-third connecting pipe; 154-annular extension; 155-first annular groove; 156-second annular groove; 157-air guide port; 158-ventilation port; 111-centrifugal fan; 112-three-way pipe. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0054] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0055] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0056] In the description of the present application, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the application is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0057] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0058] In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements.

[0059] In addition, relational terms such as the terms "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. The terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the statement "comprise one..." do not exclude the presence of other identical elements in the process, method, article or equipment including the elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0060] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0061] Please refer to Figure 1 , Figure 1It is one of the system composition diagrams of the wind turbine blade deicing system 10 provided in the embodiment of the present application. In the embodiment of the present application, the wind turbine blade deicing system 10 is applied to a wind turbine generator set, and is used to collect the heat emitted by the generator of the wind turbine generator set through internal air circulation to de-ice the blades of the unit, which is beneficial to the efficient de-icing of the unit blades, and can ensure the controllable temperature of the hot air flow by adjusting the internal circulation air volume, so as to realize dynamic de-icing of the unit blades under different ice coating thicknesses and operating conditions, thereby reducing the de-icing cost while improving the controllability of the de-icing effect. Among them, the wind turbine blade de-icing system 10 may include an air extraction unit 11, a first air valve 12, a second air valve 13, a first ventilation component 14 and a second ventilation component 15.

[0062] In this embodiment, the air extraction unit 11 is arranged in the wind turbine cabin 21 of the wind turbine generator set, and the air extraction unit 11 includes a first air inlet, a second air inlet and an air outlet. The first air inlet of the air extraction unit 11 is used to extract cold air outside the wind turbine generator set, and the second air inlet of the air extraction unit 11 is used to extract circulating return air from the gas return cavity 221 inside the blades 22 of the wind turbine generator set. The air outlet of the air extraction unit 11 is used to mix the extracted cold air and return air and then pass them into the generator closed chamber 24 of the wind turbine generator set for heat absorption. The hot air after absorbing heat in the closed chamber 24 of the generator will be transmitted to the gas reflux chamber 221 for air circulation, so that the blades 22 can be de-iced on the outer surface of the blades 22 through the internal circulating hot air, thereby collecting the heat emitted by the generator of the wind turbine generator set through the internal circulation of air to de-ice the blades of the unit, so as to effectively improve the de-icing effect while reducing the de-icing cost, which is conducive to efficient de-icing of the blades of the unit.

[0063] Wherein, a gas reflow cavity 221 is arranged inside each blade 22 of the wind turbine generator set, and the gas reflow cavity 221 includes a first cavity and a second cavity arranged in parallel, and the cavity extension length direction of the first cavity and the second cavity are respectively parallel to the length extension direction of the blade 22, and the first cavity and the second cavity are mutually connected at a position close to the tip of the corresponding blade 22, and the first cavity and the second cavity are each provided with an air outlet at a position close to the root of the corresponding blade 22, so that the two air outlets are respectively used as the air inlet and the air outlet of the gas reflow cavity 221. If there is hot air entering the gas reflow cavity 221 from the air inlet of the gas reflow cavity 221 and then flowing out from the air outlet of the gas reflow cavity 221, the hot air can de-ice the outer surface of the blade 22 when circulating in the gas reflow cavity 221.

[0064] In this embodiment, the first air inlet of the air extraction unit 11 is connected to the outside of the wind turbine generator set through the first air valve 12, so as to extract the cold air outside the wind turbine generator set through the first air valve 12. The first air valve 12 is used to adjust the air volume of the cold air extracted from the outside of the wind turbine generator set by the air extraction unit 11. The larger the air valve opening and closing angle of the first air valve 12, the larger the corresponding air volume of the extracted cold air.

[0065] In this embodiment, the second air inlet of the air extraction unit 11 is connected to the air outlet of the gas return cavity 221 inside the blade 22 of the wind turbine generator set through the second air valve 13 and the first ventilation component 14, so as to extract the return air circulating in the gas return cavity 221 through the second air valve 13 and the first ventilation component 14, wherein the first ventilation component 14 can simultaneously connect the air outlets of the gas return cavity 221 of all blades 22. The second air valve 13 is used to adjust the air volume of the return air extracted from the gas return cavity 221 by the air extraction unit 11, and the larger the air valve opening and closing angle of the second air valve 13, the larger the corresponding air volume of the extracted return air.

[0066] In this embodiment, the air outlet of the air extraction unit 11 is connected to the closed chamber 24 of the generator of the wind turbine generator set, and is used to mix the extracted air (including cold air and return air) and inject it into the closed chamber 24 of the generator for heat absorption; the second ventilation component 15 is connected to the closed chamber 24 of the generator and the air inlet of the gas return cavity 221, and is used to input the hot air in the closed chamber 24 of the generator into the gas return cavity 221 for blade de-icing, wherein the second ventilation component 15 can be connected to the air inlet of the gas return cavity 221 of all blades 22 at the same time. The air extraction unit 11 is used to adjust the air circulation volume of the air in the gas return cavity 221. The larger the ventilation volume of the air extraction unit 11, the larger the air circulation volume of the air in the gas return cavity 221. The ventilation volume of the air extraction unit 11 is equal to the sum of the ventilation volume of the cold air at the first air valve 12 and the ventilation volume of the return air at the second air valve 13.

[0067] Therefore, the present application can adjust the air volume circulating in the air during the above-mentioned de-icing process by adjusting the respective movement states of the air extraction unit 11, the first air valve 12 and the second air valve 13, so as to adjust the degree to which the air input into the gas return cavity 221 collects the heat dissipated by the generator, thereby ensuring that the temperature of the hot air flow is controllable and realizing dynamic de-icing of the unit blades 22 under different ice coating thicknesses and operating conditions, which is beneficial to the efficient de-icing of the unit blades 22, thereby reducing the de-icing cost while improving the controllability of the de-icing effect.

[0068] Optionally, see Figure 2 , Figure 2 This is the second schematic diagram of the system composition of the wind turbine blade deicing system 10 provided in the embodiment of the present application. In the embodiment of the present application, the wind turbine blade deicing system 10 may also include a temperature detection unit 16, a hub speed detection unit 17, an ice detection unit 18 and a deicing control unit 19.

[0069] In this embodiment, the ice detection unit 18 is used to detect the actual current ice thickness on the outer surface of the blade 22 of the wind turbine generator set.

[0070] In one implementation of the present embodiment, the ice detection unit 18 may include a plurality of ice detection sensors and a thickness analysis and processing module, and at least one ice detection sensor is installed on the outer surface of each blade 22, for obtaining ice thickness data on the outer surface of each blade 22; the thickness analysis and processing module communicates / electrically connects with each of the ice detection sensors, and is used to select a plurality of ice thickness data from the ice thickness data collected by all the ice detection sensors, perform an average operation or a weighted sum operation on the ice thickness data, and use the calculated thickness value as the current actual ice thickness of the outer surface of the blade 22 of the wind turbine, or directly select one ice thickness data from the ice thickness data collected by all the ice detection sensors as the current actual ice thickness of the outer surface of the blade 22 of the wind turbine.

[0071] In another implementation of the present embodiment, the ice detection unit 18 may include an ice simulation structure having a material consistent with that of the blades 22 of the wind turbine generator set, and the ice simulation structure is installed on the outer surface of the wind turbine nacelle 21 of the wind turbine generator set and is in the same operating environment as the blades 22 of the wind turbine generator set. At this time, the ice detection unit 18 may obtain ice thickness data on the ice simulation structure, and perform data correction on the obtained ice thickness data according to the motion difference between the blades 22 of the wind turbine generator set and the ice simulation structure, so as to obtain the current actual ice thickness of the outer surface of the blades 22 of the wind turbine generator set.

[0072] In this embodiment, the temperature detection unit 16 is used to detect the temperature of the cold air at the first air inlet of the air extraction unit 11 and the temperature of the return air at the second air inlet of the air extraction unit 11. The temperature detection unit 16 includes a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is installed on the air inlet side of the first air valve 12 to determine the temperature of the cold air extracted by the air extraction unit 11; and the second temperature sensor is installed on the air inlet side of the second air valve 13 to determine the temperature of the return air extracted by the air extraction unit 11.

[0073] In this embodiment, the hub speed detection unit 17 is used to detect the current actual hub speed of the hub 23 of the wind turbine generator set.

[0074] In this embodiment, the de-icing control unit 19 is electrically connected to the temperature detection unit 16, the ice detection unit 18, the first air valve 12, the second air valve 13, the hub speed detection unit 17 and the air extraction unit 11, and is used to control the respective operating conditions of the first air valve 12, the second air valve 13 and the air extraction unit 11 according to the actual ice thickness, the cold air temperature, the return air temperature and the actual hub speed, so as to adjust the air circulation volume of the wind turbine generator set and realize dynamic de-icing of the unit blades 22 under different ice coating thicknesses and operating conditions.

[0075] Optionally, in the embodiment of the present application, the wind turbine blade deicing system 10 further includes a gas pressure relief valve 20. The gas pressure relief valve 20 is connected to the first ventilation component 14 and the outside of the wind turbine generator set, and is used to balance the gas return cavity pressure when the extracted return air is mixed with the cold air, so as to avoid excessive internal pressure of the gas return cavity 221 during the hot air deicing process.

[0076] Optionally, in the embodiment of the present application, the first ventilation assembly 14 includes a multi-way rotary joint 141, a second connecting pipe 143 and a plurality of first connecting pipes 142. One end of each of the first connecting pipes 142 is communicated with an air outlet of a gas return cavity 221 inside a blade 22 of the wind turbine generator set, and the other end of each of the first connecting pipes 142 is communicated with an air inlet of the multi-way rotary joint 141.

[0077] The multi-way rotary joint 141 is fixedly installed inside the hub 23 of the wind turbine generator set, and the air outlet of the multi-way rotary joint 141 is connected to one end of the second connecting pipe 143, wherein the multi-way rotary joint 141 can rotate relative to the second connecting pipe 143 to ensure that the multi-way rotary joint 141 can be carried to rotate relative to the second connecting pipe 143 when the hub 23 rotates under the action of wind.

[0078] The other end of the second connecting pipe 143 is connected to the second air inlet of the air extraction unit 11 through the second air valve 13 to transmit the return air of each gas return chamber 221 to the air extraction unit 11. The second connecting pipe 143 can be connected to the second air valve 13 through a three-way joint, the second connecting pipe 143 is connected to one interface of the three-way joint, the gas pressure relief valve 20 is connected to one interface of the three-way joint, and the second air valve 13 is connected to the remaining interface of the three-way joint. At this time, the second connecting pipe 143 can be pressure balanced through the three-way joint through the gas pressure relief valve 20.

[0079] Optionally, in an embodiment of the present application, the air extraction unit 11 may include a centrifugal fan 111 and a three-way pipe 112, the first interface of the three-way pipe 112 is connected to the first air valve 12, so that the first interface is used as the first air inlet of the air extraction unit 11; the second interface of the three-way pipe 112 is connected to the second air valve 13, so that the second interface is used as the second air inlet of the air extraction unit 11; the air inlet of the centrifugal fan 111 is connected to the third interface of the three-way pipe 112, so that the air outlet of the centrifugal fan 111 is used as the air outlet of the air extraction unit 11.

[0080] Optionally, please refer to Figure 1 , Figure 3 , Figure 4 and Figure 5 ,in Figure 3 is a schematic diagram of the structure of the ventilation adapter plate 151 provided in an embodiment of the present application, Figure 4 is a schematic structural diagram of the annular adapter cover 152 provided in an embodiment of the present application. Figure 5 yes Figure 1 In the embodiment of the present application, the second ventilation assembly 15 may include a ventilation adapter plate 151 , an annular adapter cover 152 and a plurality of third connecting pipes 153 .

[0081] The ventilation adapter plate 151 and the annular adapter cover 152 are arranged between the generator side cover and the hub 23 shell of the wind turbine generator set. The annular adapter cover 152 is installed on the hub 23 shell, and the ventilation adapter plate 151 is installed on the generator side cover. The ventilation adapter plate 151 and the annular adapter cover 152 are simultaneously penetrated by the generator shaft of the wind turbine generator set, and the hub 23 can carry the annular adapter cover 152 to rotate relative to the ventilation adapter plate 151.

[0082] The ventilation adapter plate 151 includes an adapter plate body and an annular extension portion 154 formed on the adapter plate body, and the annular extension portion 154 is arranged on the plate body surface of the adapter plate body facing the annular adapter cover 152. The adapter plate body is fixedly mounted on the generator side cover adjacent to the generator sealed chamber 24, and a first annular groove 155 is formed on the annular extension portion 154, and the first annular groove 155 is coaxial with the annular extension portion 154, and an air guide port 157 communicating with the generator sealed chamber 24 is formed at the bottom of the groove of the first annular groove 155.

[0083] The surface of the annular adapter cover 152 facing the ventilation adapter plate 151 is provided with a second annular groove 156 matching the annular extension 154, and the first annular groove 155 cooperates with the second annular groove 156 to form a ventilated closed cavity when the annular extension 154 extends into the second annular groove 156. The matching gap between the ventilation adapter plate 151 and the annular adapter cover 152 is sealed together by a sealing ring, so that the ventilated closed cavity formed by the first annular groove 155 and the second annular groove 156 will not leak when the annular adapter cover 152 rotates with the hub 23 relative to the generator.

[0084] A plurality of ventilation holes 158 are provided at the bottom of the second annular groove 156, one end of each of the third connecting pipes 153 is connected to the air inlet of the gas return cavity 221 inside a blade 22 of the wind turbine generator set, and the other end of each of the third connecting pipes 153 is connected to a ventilation hole 158 of the second annular groove 156, so that the hot air after absorbing heat in the closed chamber 24 of the generator can be transmitted to each gas return cavity 221 through the ventilated closed cavity and each third connecting pipe 153 for de-icing.

[0085] In the present application, in order to ensure that the wind turbine blade deicing system 10 can effectively regulate the temperature of the circulating airflow that can collect the heat dissipated by the generator, so that the circulating airflow can collect heat on the basis of maintaining a certain temperature to perform blade deicing operations, and achieve a dynamic deicing effect of the unit blades 22 under different ice thicknesses and operating conditions, thereby reducing the deicing cost while improving the controllability of the deicing effect, the embodiment of the present application achieves the above-mentioned purpose by providing a blade deicing control method applied to the above-mentioned wind turbine blade deicing system 10. The blade deicing control method provided in the present application is described in detail below.

[0086] Please refer to Figure 6 , Figure 61 is a flow chart of a blade deicing control method provided in an embodiment of the present application. In an embodiment of the present application, the blade deicing control method may include steps S310 to S350.

[0087] Step S310, obtaining the current actual ice thickness on the outer surface of the blade of the wind turbine generator set, the current actual hub speed of the wind turbine generator set, and the current cold air temperature of the first air inlet and the current return air temperature of the second air inlet of the air extraction unit.

[0088] In this embodiment, the actual ice thickness can be acquired by the ice detection unit 18 , the actual hub speed can be acquired by the hub speed detection unit 17 , and the cold air temperature and the return air temperature can be acquired by the temperature detection unit 16 .

[0089] Step S320, calculating the air temperature limit value of the air currently extracted by the air extraction unit when injected into the closed chamber of the generator of the wind turbine generator set according to the actual ice thickness.

[0090] In this embodiment, the air temperature limit value is used to indicate the upper limit of the air temperature allowed when the air extracted by the air extraction unit 11 is injected into the generator sealed chamber 24 at the air outlet, and the numerical value of the air temperature limit value is positively correlated with the thickness of the ice thickness on the outer surface of the blade of the wind turbine generator set. When the degree of ice formation on the blade is high, the corresponding actual ice thickness is thicker, and a high deicing temperature is required to accelerate the melting of the blade 22, and the air injected into the generator sealed chamber 24 needs to maintain a higher basic temperature, that is, the corresponding air temperature limit value is higher; when the degree of ice formation on the blade is low, the corresponding actual ice thickness is low, and a low deicing temperature is required to maintain good heat dissipation of the generator of the wind turbine generator set, and the air injected into the generator sealed chamber 24 needs to maintain a slightly lower basic temperature, that is, the corresponding air temperature limit value is slightly lower.

[0091] In an implementation of this embodiment, each air temperature limit value corresponding to the air injected into the generator sealed chamber 24 may correspond to only one ice thickness value.

[0092] In another implementation of this embodiment, the same air temperature limit value can be configured separately for one thickness value range, and the same air temperature limit value can be configured separately for another thickness value range, wherein the upper limit of the thickness value of the previous thickness value range is less than the lower limit of the thickness value of the next thickness value range, the air temperature limit value corresponding to the previous thickness value range is less than the air temperature limit value corresponding to the next thickness value range, and the air temperature limit value between the two thickness value ranges increases gradually.

[0093] Therefore, the present application can calculate the air temperature limit value of the air currently extracted by the air extraction unit 11 matching the actual ice thickness when the air is injected into the generator closed chamber 24 by calling the pre-stored correlation between the air temperature limit value and the ice thickness.

[0094] Step S330 , calculating the expected air temperature of the air currently extracted by the air extraction unit when injected into the closed chamber of the generator according to the air temperature limit value and the actual hub speed.

[0095] In this embodiment, the expected air temperature is used to indicate the air temperature that the air extracted by the air extraction unit 11 is expected to reach when it is injected into the generator closed chamber 24. The expected air temperature is obtained by multiplying the current air temperature limit value by the temperature coefficient corresponding to the actual wheel hub speed. The magnitude of the temperature coefficient is inversely correlated with the magnitude of the actual wheel hub speed.

[0096] When the hub speed of the wind turbine generator set is high, considering that the risk area of ​​ice shedding when the wind turbine generator set melts ice is relatively wide, it is necessary to de-ice the blades for the purpose of reducing the risk of ice shedding in the sensitive area of ​​the wind turbine generator set. The expected air temperature should be lowered to slow down the de-icing speed of the blades; when the hub speed of the wind turbine generator set is low, it is necessary to de-ice the blades for the purpose of quickly removing ice from the blades. The expected air temperature should be increased to accelerate the de-icing efficiency of the blades.

[0097] In an implementation of this embodiment, each temperature coefficient acting at the air outlet of the air extraction unit 11 may correspond to only a hub speed of a wind turbine generator set.

[0098] In another implementation of the present embodiment, the same temperature coefficient may be separately configured for one wheel hub speed range, and the same temperature coefficient may be separately configured for another wheel hub speed range, wherein the upper limit of the speed value of the former wheel hub speed range is less than the lower limit of the speed value of the latter wheel hub speed range, the temperature coefficient corresponding to the former wheel hub speed range is greater than the temperature coefficient corresponding to the latter wheel hub speed range, and the temperature coefficient between the two wheel hub speed ranges decreases in a gradually decreasing manner.

[0099] Therefore, the present application can calculate the target temperature coefficient that matches the actual hub speed by calling the pre-stored correlation between the temperature coefficient and the hub speed, and combine the target temperature coefficient with the air temperature limit value to obtain the desired air temperature.

[0100] Step S340, calculating a first desired air volume ratio of the first air valve relative to the air extraction unit and a second desired air volume ratio of the second air valve relative to the air extraction unit according to the desired air temperature, the cold air temperature and the return air temperature.

[0101] In this embodiment, the calculation formulas for the first desired air volume ratio and the second desired air volume ratio are expressed as follows:

[0102]

[0103] Among them, T target It is used to represent the expected air temperature of the air extracted by the air extraction unit 11 and injected into the generator closed chamber 24, T gen It is used to indicate the current return air temperature of the second air inlet of the air extraction unit 11, T air It is used to indicate the current cold air temperature of the first air inlet of the air extraction unit 11, L fan It is used to represent the expected ventilation volume of the air extraction unit 11 for the generator closed chamber 24, L gen It is used to indicate the expected ventilation volume of the return air at the second air valve 13, L air It is used to represent the expected ventilation volume of cold air at the first air valve 12, P gen It is used to indicate the second desired air volume ratio of the second air valve 13 to the air extraction unit 11, P air It is used to indicate the first desired air volume ratio of the first air valve 12 to the air extraction unit 11 .

[0104] Therefore, the present application can calculate the second desired air volume ratio and the first desired air volume ratio by combining the above calculation formula to enable the air temperature of the air extracted by the air extraction unit 11 to reach the desired air temperature state when being injected into the generator closed chamber 24.

[0105] Step S350: adjusting the operating conditions of the first air valve, the second air valve, and the air extraction unit according to the first desired air volume ratio and the second desired air volume ratio.

[0106] In this embodiment, the desired ventilation volume of the air extraction unit 11 can be a fixed value or a variable value. For example, when rapid deicing is required, a high ventilation volume is selected as the desired ventilation volume of the air extraction unit 11 to accelerate the air flow speed in the gas return cavity 221 of the blade 22; when rapid deicing is not required, a low ventilation volume is selected as the desired ventilation volume of the air extraction unit 11 to slow down the air flow speed in the gas return cavity 221 of the blade 22. At this time, based on the first desired air volume ratio and the second desired air volume ratio, according to the pre-stored correlation between the air valve opening and closing angle and the air volume ratio, the first air valve 12 can be controlled to be adjusted to the air valve opening and closing angle matching the first desired air volume ratio, and the second air valve 13 can be controlled to be adjusted to the air valve opening and closing angle matching the second desired air volume ratio, so as to effectively control the temperature of the circulating hot air flow that collects the heat emitted by the generator by adjusting the internal circulation air volume, so as to achieve the dynamic deicing effect of the unit blade 22 under different ice coating thicknesses and operating conditions, thereby reducing the deicing cost and improving the controllability of the deicing effect.

[0107] Therefore, the present application can effectively control the temperature of the circulating airflow that can collect the heat dissipated by the generator by executing the above-mentioned steps S310 to S350, so that the circulating airflow can collect heat on the basis of maintaining a certain temperature to perform blade deicing operations, thereby achieving a dynamic deicing effect for the unit blades 22 under different ice coating thicknesses and operating conditions, thereby reducing the deicing cost while improving the controllability of the deicing effect.

[0108] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic, for example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to the embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of boxes in the block diagram and / or the flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0109] In summary, in the wind turbine blade deicing system and blade deicing control method provided in the embodiment of the present application, the present application connects the first air inlet of the air extraction unit with the outside of the wind turbine generator set via the first air valve to extract cold air outside the wind turbine generator set, and at the same time connects the second air inlet of the air extraction unit with the air outlet of the gas return cavity inside the blade of the wind turbine generator set via the second air valve and the first ventilation component to extract the return air circulating in the gas return cavity, and then connects the air outlet of the air extraction unit with the closed chamber of the generator of the wind turbine generator set to inject the extracted air into the generator. The motor absorbs heat in the closed chamber of the generator. At this time, the hot air in the closed chamber of the generator is input into the gas return chamber through the second ventilation component connecting the closed chamber of the generator and the air inlet of the gas return chamber to de-ice the blades, so that the heat dissipated by the generator is collected through the internal circulation of air for de-icing, which is beneficial to the efficient de-icing of the blades of the unit. In the de-icing process, the air extraction unit, the first air valve and the second air valve can be used to adjust the internal circulation air volume to ensure that the temperature of the hot air flow is controllable, and dynamic de-icing of the blades of the unit can be achieved under different ice coating thicknesses and operating conditions, thereby reducing the de-icing cost while improving the controllability of the de-icing effect.

[0110] The above are only various implementations of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A wind turbine blade deicing system, characterized in that: The deicing system includes an air extraction unit, a first air valve, a second air valve, a first ventilation assembly, a second ventilation assembly, a temperature detection unit, a wheel hub speed detection unit, an ice detection unit and a deicing control unit; The first air inlet of the air extraction unit is connected to the outside of the wind turbine generator set through the first air valve, and is used to extract cold air outside the wind turbine generator set; The second air inlet of the air extraction unit is connected to the air outlet of the gas return cavity inside the blade of the wind turbine generator set through the second air valve and the first ventilation component, so as to extract the return air circulating in the gas return cavity; The air outlet of the air extraction unit is in communication with the generator sealed chamber of the wind turbine generator set, and is used to inject the extracted air into the generator sealed chamber for heat absorption; The second ventilation assembly is connected to the air inlet of the generator closed chamber and the gas return chamber, and is used to input the hot air in the generator closed chamber into the gas return chamber to de-ice the blades; The ice detection unit is used to detect the actual ice thickness of the outer surface of the blade of the wind turbine generator set; The temperature detection unit is used to detect the cold air temperature at the first air inlet and the return air temperature at the second air inlet; The hub speed detection unit is used to detect the current actual hub speed of the wind turbine generator set; The de-icing control unit is electrically connected to the temperature detection unit, the ice detection unit, the first air valve, the second air valve, the hub speed detection unit and the air extraction unit, and is used to control the respective operating conditions of the first air valve, the second air valve and the air extraction unit according to the actual ice thickness, the cold air temperature, the return air temperature and the actual hub speed, so as to de-ice the outer surface of the blades of the wind turbine.

2. The deicing system according to claim 1, characterized in that: The de-icing system also includes a gas pressure relief valve; The gas pressure relief valve is connected to the first ventilation component and the outside of the wind turbine generator set, and is used to balance the gas pressure in the gas return cavity when the return air is mixed with the cold air.

3. The deicing system according to claim 1 or 2, characterized in that: The first ventilation assembly includes a multi-way rotary joint, a second connecting pipe and a plurality of first connecting pipes; One end of each of the first connecting pipes is connected to an air outlet of a gas return cavity inside a blade of the wind generator set, and the other end of each of the first connecting pipes is connected to an air inlet of the multi-way rotary joint; The multi-way rotary joint is fixedly mounted inside the hub of the wind turbine generator set, and the air outlet of the multi-way rotary joint is connected to one end of the second connecting pipe, wherein the multi-way rotary joint can rotate relative to the second connecting pipe; The other end of the second connecting pipe is communicated with the second air inlet of the air extraction unit through the second air valve.

4. The deicing system according to claim 1 or 2, characterized in that: The second ventilation assembly includes a ventilation adapter plate, an annular adapter cover and a plurality of third connecting pipes; The ventilation adapter plate and the annular adapter cover are arranged between the generator side cover and the hub shell of the wind turbine generator set, the annular adapter cover is mounted on the hub shell, and the ventilation adapter plate is mounted on the generator side cover; The annular extension of the ventilation adapter plate is provided with a first annular groove; the annular adapter cover is provided with a second annular groove matching the annular extension, and when the annular extension extends into the second annular groove, the first annular groove cooperates with the second annular groove to form a ventilated closed cavity; The bottom of the first annular groove is provided with an air guide port connected to the closed chamber of the generator, and the bottom of the second annular groove is provided with a plurality of ventilation ports; One end of each of the third connecting pipes is communicated with an air inlet of a gas reflow cavity inside a blade of the wind generator set, and the other end of each of the third connecting pipes is communicated with a vent of the second annular groove.

5. The deicing system according to claim 1 or 2, characterized in that: The air extraction unit includes a centrifugal fan and a three-way pipeline; The first interface of the three-way pipe is connected to the first air valve so that the first interface serves as the first air inlet of the air extraction unit; The second interface of the three-way pipe is connected to the second air valve, so that the second interface serves as the second air inlet of the air extraction unit; The air inlet of the centrifugal fan is connected to the third interface of the three-way pipe, so that the air outlet of the centrifugal fan is used as the air outlet of the air extraction unit.

6. A blade deicing control method, characterized in that: The wind turbine blade deicing system applied to any one of claims 1 to 5, wherein the control method comprises: Acquire the current actual ice thickness of the outer surface of the blade of the wind turbine generator set, the current actual hub speed of the wind turbine generator set, and the current cold air temperature of the first air inlet and the current return air temperature of the second air inlet of the air extraction unit; Calculating, according to the actual ice thickness, an air temperature limit value of the air currently extracted by the air extraction unit when injected into the generator closed chamber of the wind turbine generator set; Calculating, according to the air temperature limit value and the actual wheel hub speed, the expected air temperature of the air currently extracted by the air extraction unit when injected into the closed chamber of the generator; Calculating a first desired air volume ratio of the first air valve relative to the air extraction unit and a second desired air volume ratio of the second air valve relative to the air extraction unit according to the desired air temperature, the cold air temperature and the return air temperature; The operating conditions of the first air valve, the second air valve and the air extraction unit are adjusted according to the first desired air volume ratio and the second desired air volume ratio.

7. The control method according to claim 6, characterized in that: The numerical value of the air temperature limit value of the air injected into the closed chamber of the generator is positively correlated with the thickness of ice on the outer surface of the blade of the wind turbine generator set.

8. The control method according to claim 7, characterized in that: The expected air temperature of the air injected into the closed chamber of the generator is obtained by multiplying the air temperature limit value by the temperature coefficient corresponding to the actual hub speed, wherein the temperature coefficient is inversely correlated with the actual hub speed.

9. The control method according to any one of claims 6 to 8, characterized in that: The calculation formula of the first desired air volume ratio and the second desired air volume ratio is expressed by the following formula: Among them, T target It is used to represent the desired air temperature of the air extracted by the air extraction unit and injected into the closed chamber of the generator, T gen It is used to indicate the current return air temperature of the second air inlet of the air extraction unit, T air It is used to indicate the current cold air temperature of the first air inlet of the air extraction unit, L fan It is used to represent the expected ventilation volume of the air extraction unit for the generator closed chamber, L gen It is used to indicate the expected ventilation volume of the return air at the second air valve, L air It is used to represent the expected ventilation volume of cold air at the first air valve, P gen It is used to represent the second desired air volume ratio of the second air valve to the air extraction unit, P air Used to indicate a first desired air volume ratio of the first air valve relative to the air extraction unit.

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