Blade gas heat deicing air outlet volume adjusting method and device, storage medium and electronic device

Abstract

The invention discloses an adjusting method and device for blade gas heat deicing air output, a storage medium and an electronic device.The method comprises the steps that according to a temperature measured value and a temperature set value of a target object, the rotating speed set value of an air blower corresponding to the target object is determined; adjusting the output frequency and the output voltage of a frequency converter in the target object according to the rotating speed set value; and the target rotating speed of the air blower is adjusted according to the output frequency and the output voltage, and the air outlet amount of the target object is controlled according to the target rotating speed. By means of the method, the problem that the outlet hot air amount (namely the air outlet amount) of the target object cannot be adjusted according to the blade surface temperature and other factors in the related technology can be solved.

Description

Technical Field

[0001] The present application relates to the field of wind power, and in particular, to a method and device for adjusting the air output volume of blade pneumatic thermal de-icing, a storage medium, and an electronic device. Background Art

[0002] In southern China's wind farms, such as in Hunan, Hubei, Guizhou and other places, the blades of wind turbines will ice up in winter. After the blades are iced, the aerodynamic shape is changed, which affects the power generation of the unit. More seriously, it increases the load of the unit, affects the safe and stable operation of the unit, and the iced blades will cause ice shedding, endangering the personal safety of operation and maintenance personnel.

[0003] In order to reduce the impact of freezing weather on wind turbines, in related technologies, a pneumatic thermal de-icing device is generally installed at the blade root. The pneumatic thermal de-icing device is generally powered by 690V alternating current, and the outlet hot air volume cannot be accurately controlled according to factors such as the ice thickness and the blade surface temperature, which is not conducive to the energy conservation and consumption reduction of the pneumatic thermal de-icing system and the service life of the blade material.

[0004] Aiming at the problem that the outlet hot air volume of the target object in related technologies cannot be adjusted according to factors such as the blade surface temperature, no effective solution has been obtained yet. Summary of the Invention

[0005] The embodiments of the present application relate to a method and device for adjusting the air output volume of blade pneumatic thermal de-icing, a storage medium, and an electronic device. Through the embodiments of the present application, the problem that the outlet hot air volume of the target object in related technologies cannot be adjusted according to factors such as the blade surface temperature can be solved.

[0006] According to an embodiment of the present application, a method for adjusting the air output volume of blade pneumatic thermal de-icing is provided, including: determining a rotational speed setting value of a blower corresponding to the target object according to an actual measured temperature value and a set temperature value of the target object; adjusting the output frequency and output voltage of an inverter in the target object according to the rotational speed setting value; adjusting the target rotational speed of the blower according to the output frequency and the output voltage, and controlling the air output volume of the target object according to the target rotational speed.

[0007] In an exemplary embodiment, determining the rotational speed setting value of the blower according to the actual measured temperature value of the blade of the target object and a preset set temperature value includes: calculating a difference between the set temperature value and the actual measured temperature value; inputting the difference into a closed-loop controller of the inverter so that the closed-loop controller outputs a first rotational speed value of the blower; processing the first rotational speed value to output the rotational speed setting value.

[0008] In an exemplary embodiment, processing the first rotational speed value to output the rotational speed set value includes: determining the rated rotational speed of the blower; performing a clipping process on the first rotational speed according to the rated rotational speed to obtain the rotational speed set value.

[0009] In an exemplary embodiment, adjusting the output frequency and output voltage of the frequency converter in the target object according to the rotational speed set value includes: obtaining the rated frequency corresponding to the blower; determining the output frequency according to the rated frequency and the rotational speed set value; determining the output voltage according to the output frequency and the voltage-frequency characteristic curve, where the voltage-frequency characteristic curve is used to indicate the correspondence between the output voltage and the output frequency of the frequency converter.

[0010] In an exemplary embodiment, adjusting the target rotational speed of the blower according to the output frequency and the output voltage includes: generating a pulse modulation signal corresponding to the frequency converter according to the output frequency; converting the DC power supply corresponding to the frequency converter into an AC power supply according to the pulse modulation signal to determine the AC output frequency corresponding to the frequency converter; sending the AC output frequency and the output voltage to the blower to adjust the target rotational speed of the blower.

[0011] In an exemplary embodiment, after controlling the air volume output of the target object according to the target rotational speed, the method further includes: obtaining the measured rotational speed value corresponding to the target object and determining whether the measured rotational speed value is consistent with the target rotational speed; in the case where it is determined that the measured rotational speed value is not consistent with the target rotational speed, adjusting the output frequency of the frequency converter to the target output frequency and adjusting the output voltage of the frequency converter to the target output voltage; adjusting the measured rotational speed value according to the target output frequency and the target output voltage so that the adjusted measured rotational speed value is consistent with the target rotational speed.

[0012] In an exemplary embodiment, before determining the rotational speed set value of the target object according to the measured temperature value of the target object and the preset temperature set value, the method further includes: determining the temperature bearing capacity corresponding to the target object according to the target object material of the target object, and obtaining the ice thickness on the surface of the target object and the ambient temperature corresponding to the target object; and setting an initial temperature value; adjusting the initial temperature value according to the temperature bearing capacity, the ice thickness and the ambient temperature to obtain the temperature set value.

[0013] According to another embodiment of the embodiments of the present application, there is also provided an air volume adjustment device, including: a determination module, configured to determine a rotation speed setting value of a blower corresponding to the target object according to an actual temperature value and a temperature setting value of the target object; a first adjustment module, configured to adjust an output frequency and an output voltage of an inverter in the target object according to the rotation speed setting value; a second adjustment module, configured to adjust a target rotation speed of the blower according to the output frequency and the output voltage, and control an air volume of the target object according to the target rotation speed.

[0014] According to another aspect of the embodiments of the present application, there is also provided a computer-readable storage medium, in which a computer program is stored, and the computer program is configured to execute the above method when running.

[0015] According to another aspect of the embodiments of the present application, there is also provided an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the above processor executes the above method through the computer program.

[0016] According to another aspect of the embodiments of the present application, there is also provided a computer program product, including a computer program, wherein the above computer program is executed by a processor to execute the above method.

[0017] In the embodiments of the present application, a rotation speed setting value of a blower corresponding to the target object is determined according to an actual temperature value and a temperature setting value of the target object; further, an output frequency and an output voltage of an inverter in the target object are adjusted according to the rotation speed setting value; a target rotation speed of the blower corresponding to the target object is adjusted according to the output frequency and the output voltage of the inverter, and an air volume of the target object is controlled according to the target rotation speed. That is to say, an inverter is added to the target object in the embodiments of the present application. After determining the rotation speed setting value of the blower corresponding to the target object according to the actual temperature value and the temperature setting value, the output frequency and the output voltage of the inverter can be adjusted according to the rotation speed setting value, and then the target rotation speed of the blower is adjusted, and the air volume of the target object is controlled according to the target rotation speed. According to the embodiments of the present application, the problem that the outlet hot air volume of the target object in the related art cannot be adjusted according to factors such as the blade surface temperature can be solved, and the air volume of the target object can be adjusted according to the actual temperature value and the temperature setting value of the target object. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The illustrative embodiments and descriptions thereof of the present application are used to explain the present application, and do not constitute an improper limitation of the present application. In the drawings:

[0019] Figure 1It is a hardware structure block diagram of a computer terminal for a method of adjusting the air volume of blade pneumatic thermal de-icing in an embodiment of the present application;

[0020] Figure 2 It is a flowchart of a method for adjusting the air volume of blade pneumatic thermal de-icing according to an embodiment of the present application;

[0021] Figure 3 It is a schematic layout diagram of a blade pneumatic thermal de-icing system in the related art;

[0022] Figure 4 It is an electrical structure diagram of a blade pneumatic thermal de-icing system in the related art;

[0023] Figure 5 It is an electrical structure diagram of a blade pneumatic thermal de-icing system according to an embodiment of the present application;

[0024] Figure 6 It is a working schematic diagram of a temperature closed-loop controller according to an optional embodiment of the present application;

[0025] Figure 7 It is a schematic diagram of a V / f control strategy according to an optional embodiment of the present application;

[0026] Figure 8 It is a structure block diagram of a device for adjusting the air volume according to an embodiment of the present application. Detailed implementation manners

[0027] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data used can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily need to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices; "a plurality" means two or more.

[0029] The method embodiments provided by the embodiments of the present application can be executed on a computer terminal or a similar computing device, or a cloud platform, or an independent physical server, or a software platform, where the above software platform runs through one or more servers. Taking running on a computer terminal as an example, Figure 1 is a hardware structure block diagram of a computer terminal for an air volume adjustment method of blade pneumatic thermal de-icing in an embodiment of the present application. As Figure 1 shown, the computer terminal may include one or more ( Figure 1 only one is shown in the figure) processors 102 and a memory 104 for storing data. In an exemplary embodiment, the above computer terminal may further include a transmission device 106 for communication functions and an input / output device 108. Among them, the processor 102 may include, but is not limited to, a processing device such as a microprocessor MCU or a field programmable gate array FPGA. Those of ordinary skill in the art can understand that Figure 1 the structure shown in the figure is only schematic and does not limit the structure of the above computer terminal. For example, the computer terminal may further include more or fewer components than those shown in Figure 1 the figure, or have an equivalent function to that shown in Figure 1 the figure or different configurations with more functions than those shown in Figure 1 the figure.

[0030] The memory 104 can be used to store computer programs. For example, software programs and modules of application software, such as the computer program corresponding to the method in the embodiments of the present application. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, implements the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some instances, the memory 104 may further include a memory remotely set relative to the processor 102, and these remote memories can be connected to the computer terminal through a network. Examples of the above network include, but are not limited to, the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0031] The transmission device 106 is used to receive or send data via a network. Specific examples of the above network may include a wireless network provided by a communication provider of the computer terminal. In one instance, the transmission device 106 includes a network adapter (abbreviated as NIC), which can be connected to other network devices through a base station and thus can communicate with the Internet. In one instance, the transmission device 106 may be a radio frequency (abbreviated as RF) module, which is used to communicate with the Internet wirelessly.

[0032] In this embodiment, a method for adjusting the air volume of blade pneumatic thermal de-icing is provided and applied to the above computer terminal. Figure 2 It is a flowchart of the method for adjusting the air volume of blade pneumatic thermal de-icing according to an embodiment of the present application. The process includes the following steps S202 - step S206:

[0033] Step S202, determine the rotational speed setting value of the blower corresponding to the target object according to the measured temperature value and the set temperature value of the target object;

[0034] Among them, the above target object can be: the blade pneumatic thermal de-icing system of a wind turbine (i.e., blade pneumatic thermal de-icing).

[0035] The measured temperature value is the actually measured temperature of the wind turbine blade, and the set temperature value is the pre-set temperature of the wind turbine blade.

[0036] Step S204, adjust the output frequency and output voltage of the frequency converter in the target object according to the rotational speed setting value;

[0037] It can be understood that Figure 3 is a schematic layout diagram of the blade pneumatic thermal de-icing system of a wind turbine in the related art, as Figure 3 shown: The main structure of the blade pneumatic thermal de-icing system of a wind turbine in the related art is: an air heater, a blower and a heat conduit are installed at the blade root and directly lead to the inside of the blade to form a cycle of hot air flow inside the blade. Thus, ice formation on the blade surface is avoided, or the ice covering on the blade surface is melted.

[0038] Furthermore, Figure 4 is an electrical structure diagram of the blade pneumatic thermal de-icing system of a wind turbine in the related art, as Figure 4 shown: The blade pneumatic thermal de-icing system of a wind turbine in the related art includes: a tower base cabinet, a nacelle cabinet communicating with the tower base cabinet, a slip ring communicating with the nacelle cabinet, a pitch control cabinet and a de-icing control cabinet communicating with the slip ring, a blower 1, a heater 1, a PT100 sensor, a blower 2, a heater 2, a blower 3, and a heater 3 communicating with the de-icing control cabinet.

[0039] Figure 5 is an electrical structure diagram of the blade pneumatic thermal de-icing system of a wind turbine according to an embodiment of the present application, as Figure 5 shown. According to the comparison between Figure 4 and Figure 5 , the blade pneumatic thermal de-icing system in Figure 5 not only has the structure in Figure 4 , but also adds a frequency converter 1 connected to the blower 1 and the heater 1, a frequency converter 2 connected to the blower 2 and the heater 2, and a frequency converter 3 connected to the blower 3 and the heater 3.

[0040] Among them, the frequency converter in the embodiment of the present application is the Figure 5 frequency converters 1, 2, and 3 in

[0041] Among them, the frequency converter can adopt an AC-DC-AC (a topology structure) topology.

[0042] Step S206: Adjust the output frequency and output voltage of the frequency converter in the target object according to the rotation speed set value.

[0043] In the embodiment of the present application, the rotation speed set value of the blower corresponding to the target object is determined according to the measured temperature value and the set temperature value of the target object; then, the output frequency and output voltage of the frequency converter in the target object are adjusted according to the rotation speed set value; the target rotation speed of the blower is adjusted according to the output frequency and output voltage of the frequency converter, and the air output volume of the target object is controlled according to the target rotation speed. That is to say, a frequency converter is added to the target object in the embodiment of the present application. After determining the rotation speed set value of the target object according to the measured temperature value and the set temperature value, the output frequency and output voltage of the frequency converter can be adjusted according to the rotation speed set value, and then the target rotation speed of the blower is adjusted, and the air output volume of the target object is controlled according to the target rotation speed. According to the embodiment of the present application, the problem that the outlet hot air volume of the target object cannot be adjusted according to factors such as the blade surface temperature in the related art can be solved, and the air output volume of the target object can be adjusted according to the measured temperature value and the set temperature value of the target object.

[0044] Optionally, in step S202, determining the rotation speed set value of the blower corresponding to the target object according to the measured temperature value of the blade of the target object and the preset set temperature value includes: calculating the difference between the set temperature value and the measured temperature value; inputting the difference into the closed-loop controller of the frequency converter so that the closed-loop controller outputs the first rotation speed value of the blower; processing the first rotation speed value to output the rotation speed set value.

[0045] Among them, processing the first rotation speed value to output the rotation speed set value includes: determining the rated rotation speed of the blower; performing a limiting process on the first rotation speed according to the rated rotation speed to obtain the rotation speed set value.

[0046] It can be understood that in the air thermal de-icing system of the wind turbine blade, in order to achieve precise control of the internal temperature of the blade and smooth adjustment of the blower rotation speed, the embodiment of the present application defines a closed-loop control strategy based on the measured temperature value and the preset set temperature value. Specifically:

[0047] (1) Temperature difference calculation: The internal temperature of the blade (T, i.e., the measured temperature value) is continuously monitored by temperature sensors installed inside the blade. The measured temperature value will be compared with the preset temperature set value (Tset), and the temperature difference (ΔT = Tset - T) is calculated.

[0048] This step can be achieved by temperature sensors. The temperature sensors directly feed back the temperature information inside the blade to the closed-loop controller, forming a closed-loop system for real-time temperature monitoring and control to ensure precise adjustment of the blade temperature.

[0049] Wherein, before determining the rotational speed set value of the blower corresponding to the target object according to the measured temperature value and the preset temperature set value of the target object, the method further includes: determining the temperature bearing capacity corresponding to the target object according to the target object material of the target object, and obtaining the ice thickness on the surface of the target object and the ambient temperature corresponding to the target object; and setting an initial temperature value; adjusting the initial temperature value according to the temperature bearing capacity, the ice thickness and the ambient temperature to obtain the temperature set value.

[0050] It can be understood that the temperature set value is determined according to factors such as blade material characteristics, ice thickness and environmental conditions, aiming to ensure that the internal temperature of the blade reaches the optimal state to prevent icing or melt the ice layer.

[0051] (2) The closed-loop controller outputs the first rotational speed value: After obtaining the temperature difference, the temperature difference is input into the proportional integral (PI for short) closed-loop controller of the frequency converter. The closed-loop controller calculates the first rotational speed value (nset1) that the blower should adjust according to the preset control algorithm (for example: proportional integral control algorithm). The first rotational speed value reflects the adjustment amplitude required for the blower rotational speed to compensate for the temperature deviation. When ΔT is positive, it indicates that the internal temperature of the blade is lower than the target set value, and the closed-loop controller will output an increased rotational speed value to improve the heating efficiency; conversely, when ΔT is negative, it indicates that the internal temperature of the blade is higher than the target set value, and the closed-loop controller will output a decreased rotational speed value to reduce heating.

[0052] (3) Limiting process of the rotational speed set value: To ensure the safety of the system and the normal operation of the equipment, the first rotational speed value (nset1) of the blower needs to be compared with the rated rotational speed (nn) of the blower, and then a limiting process is carried out. Specifically: If the first rotational speed value nset1 exceeds the rated rotational speed range of the blower, nset1 will be adjusted to ensure that the final rotational speed set value (nset) does not exceed the rated rotational speed of the blower and is not lower than its minimum safe operating rotational speed. This limiting process avoids the blower from being overloaded or operating inefficiently, ensuring the stability and energy efficiency of the system.

[0053] In the embodiment of the present application, in the air-heating de-icing system of the wind turbine blade, the rotation speed of the blower can be adjusted in real time according to the temperature inside the blade, and at the same time, the set value of the rotation speed is ensured to be within the safe operating range of the blower.

[0054] Optionally, adjusting the output frequency and output voltage of the frequency converter in the target object according to the rotation speed set value in step S204 includes: obtaining the rated frequency corresponding to the blower; determining the output frequency according to the rated frequency and the rotation speed set value; determining the output voltage according to the output frequency and the voltage-frequency characteristic curve, where the voltage-frequency characteristic curve is used to indicate the correspondence between the output voltage and the output frequency of the frequency converter.

[0055] It can be understood that in the air-heating de-icing system of the wind turbine blade, the execution of the rotation speed set value needs to be achieved by adjusting the output frequency and output voltage of the frequency converter. As the core control device in the air-heating de-icing system of the wind turbine blade, the frequency converter can dynamically adjust the output AC frequency and voltage according to the rotation speed set value, so as to accurately control the speed of the blower. Specifically:

[0056] First, the rated frequency (fn) of the blower needs to be determined. This is the nominal AC frequency that the blower can output, usually matching the rated operating frequency of the connected motor (blower). The rated frequency is a basic parameter in the design of the blower, ensuring the best performance and energy efficiency under normal operating conditions.

[0057] Secondly, the output frequency (fset) of the frequency converter is determined according to the rotation speed set value (nset) and the rated frequency (fn) of the blower. This process is based on the electromagnetic characteristics of the motor and usually adopts the V / f (voltage / frequency) control strategy. V / f control means that the ratio of the output voltage to the output frequency remains constant to maintain the stability of the motor magnetic flux and prevent overcurrent or overheating. The determination of the output frequency is directly related to the operating speed of the blower, thus affecting the circulation efficiency of the hot air inside the blade.

[0058] Finally, after determining the output frequency (fset), the output voltage (Vset) is calculated according to the voltage-frequency characteristic curve (V / f curve). The V / f curve is an important parameter in the design of the frequency converter. It describes the voltage value output by the frequency converter at different frequencies to keep the magnetic field strength unchanged. The correct setting of the output voltage is crucial to ensure the efficient and stable operation of the blower at different rotation speeds, and it also affects the heat output of the heater.

[0059] Through the above technical solution, the embodiment of the present application achieves precise control of the blower speed in the air-heating ice removal system of the wind turbine blade, which not only improves the ice removal efficiency of the blade, reduces energy waste, but also ensures the safety and stability of the system operation. The combination of the V / f control strategy and the closed-loop control can dynamically adjust the operating state of the blower to adapt to the change of the temperature set value, and finally achieve precise control of the internal temperature of the blade, optimize the energy consumption management of the ice removal process, extend the equipment life, and improve the operating performance of the wind turbine under extreme winter conditions.

[0060] Optionally, the adjusting the target speed of the blower according to the output frequency and the output voltage in step S206 includes: generating a pulse modulation signal corresponding to the frequency converter according to the output frequency; converting the DC power supply corresponding to the frequency converter into an AC power supply according to the pulse modulation signal to determine the AC output frequency corresponding to the frequency converter; and sending the AC output frequency and the output voltage to the blower to adjust the target speed of the blower.

[0061] It can be understood that in the air-heating ice removal system of the wind turbine blade, the frequency converter is a key component to achieve precise control of the blower speed. The frequency converter can generate and adjust the corresponding AC power supply according to the given output frequency and output voltage, so as to precisely control the speed of the connected blower. Specifically:

[0062] First, after determining the output frequency (fset) and the output voltage (Vset), the frequency converter generates a pulse signal through Pulse Width Modulation (PWM) technology. PWM is a technology that can change the pulse width as needed to adjust the average voltage and frequency. Through PWM technology, the frequency converter can convert the input DC power supply (DC) into the output AC power supply (AC), and finely control the frequency and voltage of the AC power supply through the width of the pulse signal.

[0063] Second, the inverter module inside the frequency converter converts the DC power supply into an AC power supply. That is, based on the PWM signal, by changing the on-off state of the switching elements in the inverter, a sine wave or approximate sine wave AC output is generated. The frequency and voltage of the output AC power supply are determined according to the width and period of the PWM signal to ensure that they match the speed set value of the blower.

[0064] Finally, the generated AC power supply (with a specific frequency and voltage) is sent to the blower. By changing the supply frequency and voltage of the blower, the speed of the blower can be precisely controlled. Since the speed of the blower is directly related to the supply frequency, and the supply voltage affects the torque and efficiency of the motor, the frequency converter can dynamically adjust the output frequency and voltage according to the temperature control requirements to achieve smooth control of the blower speed, ensuring the efficiency of the hot air circulation inside the blade and the precise control of the blade surface temperature.

[0065] According to the above technical solution, through the PWM signal control and DC power conversion of the frequency converter, the precise and smooth control of the blower speed is achieved, improving the efficiency and energy-saving performance of the blade pneumatic thermal de-icing system. In addition, the above technical solution also ensures the stable operation of the system, avoids the problems of current impact and shortened equipment life in traditional start-stop control, and improves the operation safety and reliability of the wind turbine under severe winter conditions.

[0066] Optionally, after controlling the air volume of the target object according to the target speed in step S206, the method further includes: obtaining the measured rotational speed value corresponding to the target object, and determining whether the measured rotational speed value is consistent with the target speed; in the case where it is determined that the measured rotational speed value is inconsistent with the target speed, adjusting the output frequency of the frequency converter to the target output frequency, and adjusting the output voltage of the frequency converter to the target output voltage; adjusting the measured rotational speed value according to the target output frequency and the target output voltage, so that the adjusted measured rotational speed value is consistent with the target speed.

[0067] It can be understood that during the operation of the blade pneumatic thermal de-icing system of the wind turbine, the speed control of the blower is the key to achieving precise adjustment of the internal temperature of the blade. To ensure that the blower operates at the set target speed, the embodiments of the present application provide a speed feedback and adjustment mechanism to monitor and correct the speed deviation of the blower in real time. Specifically:

[0068] Obtaining the measured rotational speed value: After the blower starts and operates according to the target speed (nset), the actual rotational speed (nact) of the blower is monitored and obtained in real time through a rotational speed sensor installed on the blower.

[0069] Compare the measured rotational speed value (nact) with the target speed (nset) to determine whether the deviation between the two is within the allowable range. This judgment process is part of the feedback mechanism in the closed-loop control system to ensure that the actual operating state is consistent with the expected set value.

[0070] If a significant deviation is found between the measured rotational speed value and the target speed, the output frequency and output voltage of the frequency converter will be readjusted. First, calculate the target output frequency (fset), which is determined according to the relationship between the target speed of the blower and the rated frequency. Then, according to the voltage-frequency characteristic curve (V / f curve), determine the target output voltage (Vset) that matches the target output frequency. To ensure that the blower can operate stably at the target speed while optimizing the energy use efficiency.

[0071] The updated target output frequency and target output voltage are sent to the blower to drive it to adjust its operating state until the measured rotational speed value is consistent with the target rotational speed. This dynamic adjustment process continues under closed-loop control until the system reaches a stable state, ensuring the accuracy and stability of the blower operation.

[0072] By introducing a rotational speed feedback and dynamic adjustment mechanism, the embodiments of the present application can monitor the operating state of the blower in real time, ensure that its rotational speed is consistent with the target set value, thereby precisely controlling the hot air circulation inside the blade, improving the de-icing efficiency and energy usage efficiency. In addition, the embodiments of the present application can effectively respond to external environmental changes or internal system disturbances, maintain the long-term stable operation of the system, extend the equipment life, and improve the economic benefits and operating stability of the wind farm.

[0073] To better understand the process of the above method for adjusting the air volume of blade pneumatic thermal de-icing, the following further describes the method for adjusting the air volume of blade pneumatic thermal de-icing in combination with optional embodiments, but it is not used to limit the technical solutions of the embodiments of the present application.

[0074] An optional embodiment of the present application provides a wind turbine blade pneumatic thermal de-icing system, specifically:

[0075] The set value of the rotational speed of the blower in the optional embodiment of the present application is given by the closed-loop controller of the internal blade temperature. Figure 6 It is a schematic diagram of the working principle of a temperature closed-loop controller according to an optional embodiment of the present application, as Figure 6 shown:

[0076] Figure 6 In it, Tset is the set value of the internal blade environment temperature, which is generally set according to the ice thickness on the blade and the temperature bearing capacity of the blade material; T is the measured value of the internal blade environment temperature; the difference between the temperature set value and the measured temperature value (i.e., the difference) passes through a PI closed-loop controller (i.e., the closed-loop controller), and then outputs the set value of the rotational speed nset1 (i.e., the first rotational speed value). After being limited, the final set value of the rotational speed nset (i.e., the set value of the rotational speed) is output, and then participates in the V / f control to finally realize the adjustment of the rotational speed of the blower and control the air volume of the pneumatic thermal de-icing system.

[0077] Among them, Figure 7 It is a schematic diagram of the V / f control strategy according to an optional embodiment of the present application, as Figure 7 shown:

[0078] Figure 7 It shows the basic V / f control strategy for the closed-loop control of the blower rotational speed. Specifically, it includes:

[0079] 1) Tset: The set value of the internal blade environment temperature, which is used to guide the adjustment target of the closed-loop controller.

[0080] 2) T: The measured value of the internal environment temperature of the blade, which is used to feedback the current temperature state of the blade.

[0081] 3) nset1: The preliminary rotational speed set value obtained by the PI closed-loop controller through the temperature deviation.

[0082] 4) nset: The final rotational speed set value after the limiting process, which ensures that the rotational speed does not exceed the safe operating range of the motor.

[0083] 5) fn: The rated frequency of the blower, which is the reference frequency during the normal operation of the motor.

[0084] 6) V / f curve: The voltage-frequency characteristic curve, which is used to indicate the output voltage of the frequency converter at different frequencies and maintain the constant magnetic flux of the motor.

[0085] Figure 7 The basic V / f control strategy in

[0086] First, continuously monitor the deviation between the measured value (T) of the internal environment temperature of the blade and the set value (Tset). This deviation reflects the gap between the internal temperature of the blade and the target temperature, and is the adjustment basis for the closed-loop control.

[0087] Second, the temperature deviation is processed by the PI controller to output the preliminary rotational speed set value (nset1) of the blower. The PI controller combines proportional control (rapid response to deviation) and integral control (eliminating steady-state error), ensuring the accuracy and stability of the rotational speed set value.

[0088] Third, in order to protect the blower and avoid overshoot or undershoot, the preliminary rotational speed set value (nset1) is limited to generate the final rotational speed set value (nset). This limiting process ensures that the rotational speed of the blower does not exceed its safe operating range.

[0089] Fourth, based on the final rotational speed set value (nset) and the rated frequency (fn), the system determines the output frequency of the frequency converter. The determination of the output frequency follows Figure 7 the V / f voltage characteristic curve in

[0090] to ensure that the magnetic flux of the motor remains constant while adjusting the rotational speed of the blower, thereby maintaining the efficiency and torque of the motor.

[0091] Sixth, the frequency converter generates a pulse width modulation signal (PWM) based on the calculated output frequency and output voltage to control the rotational speed of the blower, ensuring that it reaches the final set value (nset), thereby precisely controlling the hot air circulation inside the blade and achieving an efficient and energy-saving de-icing effect.

[0092] Among them, Figure 7 the parabolic characteristic curve in is a part of the voltage-frequency characteristic curve in the V / f control strategy and is used to describe the non-linear relationship between the output voltage and output frequency of the frequency converter.

[0093] It should be noted that the input voltage of the heater is the output voltage of the frequency converter. When a smaller air output volume is required, the frequency converter outputs a lower voltage, and at the same time, the heat dissipation power of the heater decreases, thus reducing the loss of the entire air-heat de-icing system.

[0094] According to an optional embodiment of the present application, the problem that the temperature of the current air-heat de-icing system cannot be smoothly controlled is solved, the smooth control of the hot air volume at the outlet of the de-icing system is achieved, the system loss is reduced, and at the same time, the current impact caused by the previous start-stop control is avoided. In addition, an optional embodiment of the present application introduces a frequency converter into the air-heat de-icing system. The output voltage of the frequency converter not only controls the blower but also controls the heater at the same time, significantly reducing the system loss.

[0095] Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases, the former is a better implementation method. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disc) and includes several instructions for causing a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods of various embodiments of the present application.

[0096] The present application embodiment also provides a structural block diagram of an air output volume adjustment device, Figure 8 which is the structural block diagram of the air output volume adjustment device according to the embodiment of the present application; as Figure 8 shown, it includes:

[0097] A determination module 82, configured to determine the rotational speed set value of the blower corresponding to the target object according to the measured temperature value and the set temperature value of the target object;

[0098] A first adjustment module 84, configured to adjust the output frequency and output voltage of the frequency converter in the target object according to the rotational speed set value;

[0099] A second adjustment module 86, configured to adjust a target rotation speed of the blower according to the output frequency and the output voltage, and control an air volume output by the target object according to the target rotation speed.

[0100] With the above device, a rotation speed set value of a blower corresponding to a target object is determined according to an actual temperature value and a set temperature value of the target object; then, an output frequency and an output voltage of an inverter in the target object are adjusted according to the rotation speed set value; the target rotation speed of the blower is adjusted according to the output frequency and the output voltage of the inverter, and the air volume output by the target object is controlled according to the target rotation speed. That is to say, an inverter is added to the target object in the embodiment of the present application. After determining the rotation speed set value of the blower corresponding to the target object according to the actual temperature value and the set temperature value, the output frequency and the output voltage of the inverter can be adjusted according to the rotation speed set value, and then the target rotation speed of the blower is adjusted, and the air volume output by the target object is controlled according to the target rotation speed. According to the embodiment of the present application, the problem that the hot air volume at the outlet of the target object in the related art cannot be adjusted according to factors such as the blade surface temperature can be solved, and thus the air volume output by the target object can be adjusted according to the actual temperature value and the set temperature value of the target object.

[0101] In an exemplary embodiment, the determining module 82 is further configured to calculate a difference between the set temperature value and the actual temperature value; input the difference into a closed-loop controller of the inverter, so that the closed-loop controller outputs a first rotation speed value of the blower; process the first rotation speed value to output the rotation speed set value.

[0102] In an exemplary embodiment, the determining module 82 is further configured to determine a rated rotation speed of the blower; perform a clipping process on the first rotation speed according to the rated rotation speed to obtain the rotation speed set value.

[0103] In an exemplary embodiment, the first adjustment module 84 is further configured to obtain a rated frequency corresponding to the blower; determine the output frequency according to the rated frequency and the rotation speed set value; determine the output voltage according to the output frequency and a voltage-frequency characteristic curve, where the voltage-frequency characteristic curve is used to indicate a correspondence between the output voltage and the output frequency of the inverter.

[0104] In an exemplary embodiment, the second adjustment module 86 is further configured to generate a pulse modulation signal corresponding to the inverter according to the output frequency; convert a DC power supply corresponding to the inverter into an AC power supply according to the pulse modulation signal to determine an AC output frequency corresponding to the inverter; send the AC output frequency and the output voltage to the blower to adjust the target rotation speed of the blower.

[0105] In an exemplary embodiment, the second adjustment module 86 is further configured to obtain the measured rotational speed value corresponding to the target object, and determine whether the measured rotational speed value is consistent with the target rotational speed; in the case where it is determined that the measured rotational speed value is not consistent with the target rotational speed, adjust the output frequency of the frequency converter to the target output frequency, and adjust the output voltage of the frequency converter to the target output voltage; adjust the measured rotational speed value according to the target output frequency and the target output voltage, so that the adjusted measured rotational speed value is consistent with the target rotational speed.

[0106] In an exemplary embodiment, the determination module 82 is further configured to determine the temperature bearing capacity corresponding to the target object according to the target object material of the target object, and obtain the ice thickness on the surface of the target object and the ambient temperature corresponding to the target object; and set an initial temperature value; adjust the initial temperature value according to the temperature bearing capacity, the ice thickness and the ambient temperature to obtain the temperature setting value.

[0107] An embodiment of the present application further provides a storage medium, which includes a stored program, wherein the above program executes the method of any one of the above when running.

[0108] Optionally, in this embodiment, the above storage medium may be set to store program codes for executing the following steps:

[0109] S1, determine the set rotational speed value of the blower corresponding to the target object according to the measured temperature value and the set temperature value of the target object;

[0110] S2, adjust the output frequency and output voltage of the frequency converter in the target object according to the set rotational speed value;

[0111] S3, adjust the target rotational speed of the blower according to the output frequency and the output voltage, and control the air volume output of the target object according to the target rotational speed.

[0112] An embodiment of the present application further provides an electronic device, including a memory and a processor, where a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0113] Optionally, the above electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the above processor, and the input / output device is connected to the above processor.

[0114] Optionally, in this embodiment, the above processor may be configured to execute the following steps through a computer program:

[0115] S1. Determine the set value of the rotational speed of the blower corresponding to the target object according to the measured temperature value and the set temperature value of the target object;

[0116] S2. Adjust the output frequency and output voltage of the frequency converter in the target object according to the set value of the rotational speed;

[0117] S3. Adjust the target rotational speed of the blower according to the output frequency and the output voltage, and control the air output volume of the target object according to the target rotational speed.

[0118] An embodiment of the present application also provides a computer program product, including a computer program, and the computer program is executed by a processor to perform the steps in any one of the above method embodiments.

[0119] Optionally, in this embodiment, the above computer program product can be executed by a processor to perform the following steps:

[0120] S1. Determine the set value of the rotational speed of the blower corresponding to the target object according to the measured temperature value and the set temperature value of the target object;

[0121] S2. Adjust the output frequency and output voltage of the frequency converter in the target object according to the set value of the rotational speed;

[0122] S3. Adjust the target rotational speed of the blower according to the output frequency and the output voltage, and control the air output volume of the target object according to the target rotational speed.

[0123] Optionally, in this embodiment, the above storage medium may include but is not limited to: various media such as USB flash drives, read-only memories (ROM for short), random access memories (RAM for short), mobile hard disks, magnetic disks or optical discs that can store program codes.

[0124] Optionally, specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and details are not described herein again.

[0125] Obviously, those skilled in the art should understand that the various modules or steps of the present application described above can be implemented by a general-purpose computing device. They can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Optionally, they can be implemented by program codes executable by the computing device. Thus, they can be stored in a storage device and executed by the computing device. And in some cases, the steps shown or described can be executed in a different order from here, or they can be separately fabricated into individual integrated circuit modules, or multiple modules or steps among them can be fabricated into a single integrated circuit module for implementation. In this way, the present application is not limited to any specific combination of hardware and software.

[0126] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the principle of the present application shall be included within the protection scope of the present application.

Claims

1. A method for adjusting the air flow rate of blade thermal deicing, characterized in that: include: Determine a speed setting value of a blower corresponding to the target object according to a measured temperature value and a temperature setting value of the target object; adjusting the output frequency and output voltage of the frequency converter in the target object according to the speed setting value; The target rotation speed of the blower is adjusted according to the output frequency and the output voltage, and the air output of the target object is controlled according to the target rotation speed.

2. The method for adjusting the air flow rate of blade thermal deicing according to claim 1, characterized in that: Determining a speed setting value of a blower corresponding to the target object according to a temperature measurement value of a blade of the target object and a preset temperature setting value, comprising: Calculating the difference between the temperature setting value and the temperature measured value; Inputting the difference into a closed-loop controller of the frequency converter so that the closed-loop controller outputs a first speed value of the blower; The first speed value is processed to output the speed setting value.

3. The method for adjusting the air flow rate of blade thermal deicing according to claim 2, characterized in that: Processing the first speed value to output the speed setting value includes: determining a rated speed of the blower; The first speed is limited according to the rated speed to obtain the speed setting value.

4. The method for adjusting the air flow rate of blade thermal deicing according to claim 1, characterized in that: Adjusting the output frequency and output voltage of the frequency converter in the target object according to the speed setting value includes: Obtaining the rated frequency corresponding to the blower; Determining the output frequency according to the rated frequency and the speed setting value; The output voltage is determined according to the output frequency and a voltage-frequency characteristic curve, wherein the voltage-frequency characteristic curve is used to indicate a corresponding relationship between the output voltage and the output frequency of the inverter.

5. The method for adjusting the air flow rate of blade thermal deicing according to claim 1, characterized in that: The target speed of the blower is adjusted according to the output frequency and the output voltage, comprising: Generate a pulse modulation signal corresponding to the frequency converter according to the output frequency; Converting the DC power supply corresponding to the frequency converter into AC power supply according to the pulse modulation signal to determine the AC output frequency corresponding to the frequency converter; The AC output frequency and the output voltage are sent to the blower to adjust a target rotation speed of the blower.

6. The method for adjusting the air flow rate of blade thermal deicing according to claim 1, characterized in that: After controlling the air volume of the target object according to the target rotation speed, the method further includes: Obtaining a rotation speed measurement value corresponding to the target object, and determining whether the rotation speed measurement value is consistent with the target rotation speed; When it is determined that the actual speed value is inconsistent with the target speed, adjusting the output frequency of the frequency converter to the target output frequency, and adjusting the output voltage of the frequency converter to the target output voltage; The rotational speed measured value is adjusted according to the target output frequency and the target output voltage, so that the adjusted rotational speed measured value is consistent with the target rotational speed.

7. The method for adjusting the air flow rate of blade thermal deicing according to claim 1, characterized in that: Before determining the speed setting value of the blower corresponding to the target object according to the actual temperature value of the target object and the preset temperature setting value, the method further includes: Determine the temperature bearing capacity corresponding to the target object according to the target object material of the target object, obtain the ice thickness on the surface of the target object and the ambient temperature corresponding to the target object; and set an initial temperature value; The initial temperature value is adjusted according to the temperature bearing capacity, the ice thickness and the ambient temperature to obtain the temperature setting value.

8. An air volume adjustment device, characterized in that: include: A determination module, used to determine a speed setting value of the blower corresponding to the target object according to a temperature measured value and a temperature setting value of the target object; A first adjustment module, used for adjusting the output frequency and output voltage of the frequency converter in the target object according to the speed setting value; The second adjustment module is used to adjust the target rotation speed of the blower according to the output frequency and the output voltage, and control the air output of the target object according to the target rotation speed.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein the program executes the method described in any one of claims 1 to 7 when executed.

10. An electronic device comprising a memory and a processor, characterized in that: A computer program is stored in the memory, and the processor is configured to execute the method according to any one of claims 1 to 7 through the computer program.

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