Power increasing and deicing method for wind driven generator blade

Abstract

The invention relates to the technical field of wind driven generator blades, and discloses a power increasing and deicing method for wind driven generator blades, which comprises the following steps: S1, analyzing field wind resources and calculating parameters: collecting long-term data by using meteorological data and wind field measurement equipment, analyzing the wind resources, and analyzing and calculating key parameters based on the wind resources; s2, load comparison and strength evaluation: simulating stress conditions of the extended blade at different wind speeds, calculating new load distribution, and comparing a calculation result with an original design load of a unit; s3, on-site blade extension technical improvement is implemented, specifically, the blade tip of an original blade is cut, temperature and flow monitoring equipment is installed at the position of the blade tip, and a blade tip extension section is firmly bonded with the blade root and the blade tip; s4, blade rotation positioning is conducted, specifically, the blades are subjected to pitch changing till the blades are parallel to the ground, the SS faces are downward, and after pitch changing is completed, the blades and the impeller are locked; and S5, polishing and mounting position marking: marking the mounting position of the air guide pipe, and polishing the mounting positions of the air blower and the heater.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine blades, and in particular to a method for increasing power and deicing wind turbine blades. Background Art

[0002] Wind power is currently the most technologically mature and commercially viable renewable energy source. Compared to traditional energy sources, wind power boasts advantages such as cleanliness, safety, and sustainability. After more than a decade of rapid development, my country's wind power industry has become the third largest energy source in the country, following coal-fired power and hydropower.

[0003] As a crucial component of my country's energy mix, wind power's economic viability is attracting increasing attention. As wind power's share of energy supply continues to grow, major wind power operators are increasingly raising their cost awareness and working to reduce the cost gap between wind power and traditional electricity, thereby driving industry development. For operational wind power projects, improvements in operational efficiency, turbine quality, and maintenance are all contributing to lower wind power costs.

[0004] In the early stages of the domestic wind power industry's development, insufficient and conservative design experience, limited scope for turbine selection, and relatively rough feasibility studies, micro-site selection, and load assessments led to deviations in turbine selection and a significant waste of component safety margins. In recent years, global wind speeds have declined year by year, resulting in wind farms with overestimated wind speeds and underperforming actual power generation performance. Furthermore, with the scaled-up development of wind farms, large-scale installations near existing wind farms have caused wind speeds to drop, resulting in wind farm power generation performance failing to meet expectations. Southern my country suffers from low temperatures and high humidity, creating an extremely harsh environment. When wind turbines operate at temperatures of zero degrees Celsius or below, if they encounter humid air, rain, salt spray, ice, and snow, especially cooling water droplets, ice can form on the blades, significantly damaging the equipment. Therefore, a method for increasing the power and de-icing wind turbine blades is proposed. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the prior art, such as the inability to use a gas-thermal deicing system for some blade types due to blockage of the blade tip channel, the inability to fully utilize the unit performance for some blade types due to high design margin, the unsatisfactory power generation of the unit, and the inability of the existing gas-thermal deicing method to monitor the temperature of the blade tip airflow. A method for increasing the power and deicing the blades of a wind turbine is proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for increasing power and deicing blades of a wind turbine generator comprises the following steps:

[0008] S1: Analyze on-site wind resources and calculate parameters: Use meteorological data and wind field measurement equipment (such as anemometers, wind vanes, etc.) to collect long-term data and analyze wind resources, including wind speed distribution and wind direction changes. Based on the wind resource analysis, calculate key parameters such as wind pressure, torque, and power curves;

[0009] S2: Load comparison and strength assessment: Use professional software (such as ANSYS, Bladed, etc.) to simulate the stress conditions of the extended blades at different wind speeds, calculate the new load distribution, and compare the calculated results with the original design load of the unit to ensure that the extended blades and their supporting structures meet the strength and safety requirements;

[0010] S3: On-site blade extension technical modification implementation: cut the tip of the original blade, install temperature and flow monitoring equipment at the tip position, and firmly bond the tip extension section to the blade root and blade tip;

[0011] S4: Blade rotation positioning: Change the blade pitch until the blade is parallel to the ground and the SS faces downward (i.e. the web is perpendicular to the ground). After the pitch change is completed, the blade and impeller are locked;

[0012] S5: Polishing and installation position marking: mark the installation position of the air duct, and polish the installation position of the blower and heater;

[0013] S6: Air outlet sensor and wind shield installation: Install the sensor at the air outlet of the air duct and install the wind shield;

[0014] S7: Fixing the air duct and sensor cable: Connect the air duct and fix the sensor cable and power cable inside the blade;

[0015] S8: Bracket hand lay-up fixation: Place the bracket at the designated position on the leading edge of the blade root;

[0016] S9: Hot air blower installation and cable arrangement: Assemble the blower and heater into a hot air blower and fix it on the bracket, and arrange the cables.

[0017] The above further includes:

[0018] In S1, the specific steps for analyzing on-site wind resources and calculating parameters are as follows:

[0019] Wind resource data collection and analysis:

[0020] Select measurement equipment: Use wind field measurement equipment such as anemometers and wind vanes to collect data. Consider high-altitude wind measurement technologies, such as wind speed measurement devices carried by drones or satellites, to obtain more comprehensive high-altitude wind energy resource data;

[0021] Data collection: Set data collection cycles to cover different seasons and weather conditions. The data includes basic information such as wind speed and direction in time series.

[0022] Data preprocessing: clean up outliers, fill in missing values, and perform data quality assessment, including completeness, accuracy, consistency, and timeliness;

[0023] Data Analysis: Draw wind speed frequency distribution maps and wind rose diagrams to understand wind speed distribution and dominant wind direction. Use GIS to build digital terrain models and three-dimensional wind energy resource distribution maps to understand the regional distribution patterns of wind energy resources. Use big data analysis tools to discover patterns in the data and predict the changing trends of wind energy resources.

[0024] Calculate key parameters:

[0025] Wind pressure calculation: Wind pressure is one of the important parameters in wind turbine blade design. Its calculation formula is:

[0026]

[0027] Where P is wind pressure, ρ is air density, which varies with altitude and temperature and needs to be calculated or looked up in a table based on specific conditions, and u is wind speed;

[0028] Torque calculation: Torque is a key factor in wind turbine output power. It is related to wind speed and blade characteristics and is calculated based on power and speed:

[0029]

[0030] Where T is the torque, P is the output power of the wind turbine, and ω is the angular velocity of the wind rotor. The output power of a wind turbine is usually related to the wind speed and wind energy density and can be estimated using the power curve (usually a function of wind speed).

[0031] Power curve calculation: The power curve is a curve that describes the output power of a wind turbine at different wind speeds. It is obtained through experimental data or numerical simulation. Under a simplified model, it can be expressed as a piecewise function, with each segment representing a different wind speed range and corresponding power output.

[0032] Evaluate the impact of blade extension on unit performance:

[0033] Theoretical calculation: Based on the new blade length, recalculate the wind pressure, torque and power curves, considering the impact of the increased blade length on the starting wind speed, maximum power point and mechanical load;

[0034] Numerical simulation: Use CFD (computational fluid dynamics) software to simulate the aerodynamic performance of blades at different wind speeds and wind directions, analyze blade deformation, stress distribution, etc., to ensure design safety;

[0035] Economic evaluation: Considering the manufacturing cost, installation cost, and operational benefits of blade extension, evaluate the increase in power generation and overall economic feasibility after blade extension;

[0036] Field test: When conditions permit, conduct field tests to verify the results of theoretical calculations and numerical simulations;

[0037] Summary and suggestions:

[0038] Based on the analysis results, the specific impact of blade extension on unit performance is summarized, and suggestions for optimizing design and operation strategies are put forward. These suggestions should comprehensively consider factors such as technical feasibility, economy and safety.

[0039] In S3, the specific steps for implementing the on-site blade extension technical modification are:

[0040] Tip cutting: Cut the tip of the original leaf to ensure that the cutting surface is flat and smooth in preparation for bonding;

[0041] Grinding and cleaning of bonding area: Grind and clean the bonding area thoroughly to remove oil stains, oxide layer, etc. to improve bonding strength;

[0042] Bonding temperature monitoring equipment at the blade tip: Install temperature and flow monitoring equipment at the blade tip to monitor temperature changes in the bonding area in real time to prevent overheating or low temperature from affecting the bonding effect;

[0043] Tip extension bonding: Use high-performance adhesive to firmly bond the tip extension to the blade root and blade tip;

[0044] Pre-curing and hand lay-up reinforcement: Improve bonding quality through pre-curing and hand lay-up reinforcement;

[0045] Post-curing and post-treatment: Post-curing treatment is carried out to ensure that the bonding strength meets the design requirements.

[0046] In S4, the specific steps of blade rotation positioning are:

[0047] Precise pitch control: Pitch the blades until they are parallel to the ground with the SS facing downwards, i.e. the web is perpendicular to the ground;

[0048] Lock the blades: After the pitch change is completed, use the safety locking device to lock the blades and impeller to prevent accidental rotation.

[0049] In S5, the specific steps for polishing and installing position marks are as follows:

[0050] Air duct installation position mark: Install the air duct at the corner where the leading edge channel of the blade contacts the SS surface of the blade;

[0051] Grinding position: Grind the installation position of the blower and heater from the starting point of the blade root web at the inner leading edge of the blade root web

[0052] In S6, the specific steps for installing the air outlet sensor and air dam are as follows:

[0053] Sensor installation: Install two PT100 sensors at the air duct outlet and fix them to the blade root web using structural adhesive and fiberglass cloth. They are used to monitor the air outlet temperature and ensure the de-icing effect.

[0054] Windshield installation: After the windshield is assembled, it is installed horizontally at the designated position of the inner cavity of the leading edge of the blade root to adjust the air volume and temperature distribution. The sensor lead is routed through the air duct hole reserved in the windshield.

[0055] In S8, the specific steps for bracket hand lay-up are as follows:

[0056] Hot air blower installation: Assemble the blower and heater brackets;

[0057] Fixing the bracket: Place the bracket at the designated position on the leading edge of the blade root. Paste the cloth in a way that the larger one covers the smaller one. The final size of the paste should exceed a certain width on all sides of the bottom of the bracket.

[0058] In S9, the specific steps for installing the hot air blower and organizing the cables are as follows:

[0059] Hot air blower installation: Assemble the blower and heater into a hot air blower, align the hot air blower with the holes on the bracket and fasten it with bolts;

[0060] Cable arrangement: All cables are arranged and fixed with structural adhesive and resin by hand paste. Power cables and signal cables are bundled separately and arranged separately on the inner wall of the blade.

[0061] Cable lead-out: Drill a hole on the blade root baffle and install a corrugated tube, lead the cable out of the corrugated tube for connection to the external control system.

[0062] The present invention has the following beneficial effects:

[0063] 1. In the present invention, for blade types with easily blocked blade tip channels, the path and outlet position of the air duct are redesigned to ensure that hot air can be blown smoothly to the blade tip to avoid accumulation or blockage in the channel. Based on the real-time monitored parameters such as blade tip temperature and wind speed, the output power and wind direction of the hot air blower are dynamically adjusted to more effectively remove ice while avoiding unnecessary energy waste.

[0064] 2. In the present invention, the wind sweeping area of the blades and the ability to capture wind energy are increased by extending the blades, thereby improving the power generation efficiency of the unit.

[0065] 3. In the present invention, a high-precision temperature sensor is installed at the blade tip to monitor the temperature of the blade tip airflow in real time. This data can be sent to the ground control room or cloud server via wireless transmission for further analysis and processing, solving the problem that the existing gas-heat deicing method cannot monitor the temperature of the blade tip airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 A method step diagram of a method for increasing power and deicing blades of a wind turbine proposed by the present invention;

[0067] Figure 2 It is a schematic structural diagram of the blade extension and gas-heat deicing device of the present invention;

[0068] Figure 3 It is a schematic diagram of the blade extension section in the present invention.

[0069] In the figure: 1. Blower; 2. Heater; 3. Air duct; 4. Wind shield; 5. Leading edge channel; 6. Original blade tip cut-off position; 7. Temperature and flow monitoring equipment; 8. Blade tip; 9. Middle channel of web; 10. Trailing edge channel; 11. Blade root; 12. Blade tip extension section; 13. Blade tip baffle; 14. Blade root baffle. DETAILED DESCRIPTION

[0070] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0071] See also Figure 1-Figure 3 As shown, the present invention is a method for increasing power and deicing blades of a wind turbine, comprising the following steps:

[0072] S1: Analyze on-site wind resources and calculate parameters: Use meteorological data and wind field measurement equipment (such as anemometers, wind vanes, etc.) to collect long-term data and analyze wind resources, including wind speed distribution and wind direction changes. Based on the wind resource analysis, calculate key parameters such as wind pressure, torque, and power curves;

[0073] S2: Load comparison and strength assessment: Use professional software (such as ANSYS, Bladed, etc.) to simulate the stress conditions of the extended blades at different wind speeds, calculate the new load distribution, and compare the calculated results with the original design load of the unit to ensure that the extended blades and their supporting structures meet the strength and safety requirements;

[0074] S3: On-site blade extension technical modification implementation: cut the blade tip 8 of the original blade, install the temperature and flow monitoring device 7 at the position of the blade tip 8, and firmly bond the blade tip extension section 12 to the blade root 11 and the blade tip 8;

[0075] S4: Blade rotation positioning: Change the blade pitch until the blade is parallel to the ground and the SS faces downward (i.e. the web is perpendicular to the ground). After the pitch change is completed, the blade and impeller are locked;

[0076] S5: Polishing and installation position marking: mark the installation position of the air duct 3, and polish the installation positions of the blower 1 and the heater 2;

[0077] S6: Install the air outlet sensor and wind deflector: Install the sensor at the air outlet of the air duct 3 and the wind deflector 4;

[0078] S7: Fixing the air duct and sensor cable: Connect the air duct 3 and fix the sensor cable and power cable inside the blade;

[0079] S8: Bracket manual lay-up fixation: Place the bracket at the designated position on the leading edge of the blade root 11;

[0080] S9: Hot air blower installation and cable arrangement: Assemble blower 1 and heater 2 into a hot air blower and fix it on the bracket, and arrange the cables.

[0081] The working principle of the power increase and de-icing method of a wind turbine blade proposed in the present invention is to first extend the blade and then install the gas-heat de-icing system. After the installation is completed, the blower 1 is started, and the air flow is heated by the heater 2 and passes through the air duct 3. A sensor is installed at the air outlet of the air duct 3 to detect the air flow. The air flow is transferred to the leading edge channel 5 through the wind deflector 4, and enters the position of the blade tip extension section 12 and the blade tip 8 through the leading edge channel 5. The temperature and flow monitoring equipment 7 detects the passing air flow and monitors the temperature of the blade tip air flow. These data can be sent to the ground control room or the cloud server through wireless transmission for further analysis and processing. The air flow returns to the blower 1 through the trailing edge channel 10 to form a cycle. The hot air can be blown smoothly to the blade tip 8 to avoid accumulation or blockage in the trailing edge channel 10, the web middle channel 9 and the leading edge channel 5.

[0082] In one embodiment, for the above S1, in S1, the specific steps of analyzing on-site wind resources and calculating parameters are:

[0083] Wind resource data collection and analysis:

[0084] Select measurement equipment: Use wind field measurement equipment such as anemometers and wind vanes to collect data. Consider high-altitude wind measurement technologies, such as wind speed measurement devices carried by drones or satellites, to obtain more comprehensive high-altitude wind energy resource data;

[0085] Data collection: Set data collection cycles to cover different seasons and weather conditions. The data includes basic information such as wind speed and direction in time series.

[0086] Data preprocessing: clean up outliers, fill in missing values, and perform data quality assessment, including completeness, accuracy, consistency, and timeliness;

[0087] Data Analysis: Draw wind speed frequency distribution maps and wind rose diagrams to understand wind speed distribution and dominant wind direction. Use GIS to build digital terrain models and three-dimensional wind energy resource distribution maps to understand the regional distribution patterns of wind energy resources. Use big data analysis tools to discover patterns in the data and predict the changing trends of wind energy resources.

[0088] Calculate key parameters:

[0089] Wind pressure calculation: Wind pressure is one of the important parameters in wind turbine blade design. Its calculation formula is:

[0090]

[0091] Where P is wind pressure, ρ is air density, which varies with altitude and temperature and needs to be calculated or looked up in a table based on specific conditions, and u is wind speed;

[0092] Torque calculation: Torque is a key factor in wind turbine output power. It is related to wind speed and blade characteristics and is calculated based on power and speed:

[0093]

[0094] Where T is the torque, P is the output power of the wind turbine, and ω is the angular velocity of the wind rotor. The output power of a wind turbine is usually related to the wind speed and wind energy density and can be estimated using the power curve (usually a function of wind speed).

[0095] Power curve calculation: The power curve is a curve that describes the output power of a wind turbine at different wind speeds. It is obtained through experimental data or numerical simulation. Under a simplified model, it can be expressed as a piecewise function, with each segment representing a different wind speed range and corresponding power output.

[0096] Evaluate the impact of blade extension on unit performance:

[0097] Theoretical calculation: Based on the new blade length, recalculate the wind pressure, torque and power curves, considering the impact of the increased blade length on the starting wind speed, maximum power point and mechanical load;

[0098] Numerical simulation: Use CFD (computational fluid dynamics) software to simulate the aerodynamic performance of blades at different wind speeds and wind directions, analyze blade deformation, stress distribution, etc., to ensure design safety;

[0099] Economic evaluation: Considering the manufacturing cost, installation cost, and operational benefits of blade extension, evaluate the increase in power generation and overall economic feasibility after blade extension;

[0100] Field test: When conditions permit, conduct field tests to verify the results of theoretical calculations and numerical simulations;

[0101] Summary and suggestions:

[0102] Based on the analysis results, the specific impact of blade extension on unit performance is summarized, and suggestions for optimizing design and operation strategies are put forward. These suggestions should comprehensively consider factors such as technical feasibility, economy and safety.

[0103] In one embodiment, for the above S3, in S3, the specific steps for implementing the on-site blade extension technical modification are:

[0104] Tip cutting: cutting the tip 8 of the original leaf to ensure that the cutting surface is flat and smooth in preparation for bonding;

[0105] Grinding and cleaning of bonding area: Grind and clean the bonding area thoroughly to remove oil stains, oxide layer, etc. to improve bonding strength;

[0106] Bonding temperature monitoring equipment at the blade tip: Install temperature and flow monitoring equipment 7 at the blade tip 8 to monitor temperature changes in the bonding area in real time to prevent overheating or low temperature from affecting the bonding effect;

[0107] Tip extension bonding: Use a high-performance adhesive to firmly bond the tip extension 12 to the blade root 11 and the blade tip 8;

[0108] Pre-curing and hand lay-up reinforcement: Improve bonding quality through pre-curing and hand lay-up reinforcement;

[0109] Post-curing and post-treatment: Post-curing treatment is carried out to ensure that the bonding strength meets the design requirements.

[0110] In one embodiment, for the above S4, in S4, the specific steps of rotating and positioning the blades are:

[0111] Precise pitch control: Pitch the blades until they are parallel to the ground with the SS facing downwards, i.e. the web is perpendicular to the ground;

[0112] Lock the blades: After the pitch change is completed, use the safety locking device to lock the blades and impeller to prevent accidental rotation.

[0113] In one embodiment, for the above S5, in S5, the specific steps of polishing and installing the position mark are:

[0114] Air duct installation position mark: Install the air duct 3 at the corner where the blade leading edge channel 5 contacts the blade SS surface;

[0115] Grinding position: Grinding the installation position of the blower 1 and the heater 2 from the starting point of the blade root web 14 at the inner leading edge of the blade root web 14 .

[0116] In one embodiment, for the above S6, in S6, the specific steps of installing the air outlet sensor and the air blocking plate are:

[0117] Sensor installation: Install two PT100 sensors at the air outlet of the air duct 3 and fix them to the blade root web 14 using structural adhesive and fiberglass cloth. They are used to monitor the air outlet temperature and ensure the de-icing effect.

[0118] Windshield installation: After the windshield 4 is assembled, it is installed horizontally at a designated position in the inner cavity of the leading edge of the blade root 11 to adjust the air volume and temperature distribution. The sensor lead is routed through the air duct hole reserved in the windshield 4.

[0119] In one embodiment, for the above S8, in S8, the specific steps of manually fixing the bracket are:

[0120] Hot air blower installation: Assemble the brackets of blower 1 and heater 2;

[0121] Fix the bracket: Place the bracket at the designated position on the leading edge of the blade root 11. Place the bracket at the designated position on the leading edge of the blade root 11. Paste the cloth in a way that the larger one covers the smaller one. The final size of the paste cloth exceeds a certain width on all sides of the bottom of the bracket.

[0122] In one embodiment, for the above S9, in S9, the specific steps of installing the hot air blower and arranging the cables are as follows:

[0123] Hot air blower installation: Assemble the blower 1 and heater 2 into a hot air blower, align the hot air blower with the holes on the bracket and fasten it with bolts;

[0124] Cable arrangement: All cables are arranged and fixed with structural adhesive and resin by hand paste. Power cables and signal cables are bundled separately and arranged separately on the inner wall of the blade.

[0125] Cable lead-out: Drill a hole on the blade root 11 baffle and install a corrugated tube, lead the cable out of the corrugated tube to connect to the external control system.

[0126] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for increasing power and deicing blades of a wind turbine, characterized in that: The following steps are involved: S1: Analyze on-site wind resources and calculate parameters: Use meteorological data and wind field measurement equipment to collect long-term data, analyze wind resources, and calculate key parameters based on wind resource analysis; S2: Load comparison and strength assessment: simulate the force on the extended blades at different wind speeds, calculate the new load distribution, and compare the calculated results with the original design load of the unit; S3: On-site blade extension technical transformation implementation: cutting the blade tip (8) of the original blade, installing the temperature and flow monitoring device (7) at the blade tip (8), and firmly bonding the blade tip extension section (12) to the blade root (11) and the blade tip (8); S4: Blade rotation positioning: Change the blade pitch until the blade is parallel to the ground with the SS facing downward. After the pitch change is completed, lock the blade and impeller; S5: Polishing and installation position marking: marking the installation position of the air duct (3), polishing the installation position of the blower (1) and the heater (2); S6: Install the air outlet sensor and wind deflector: Install the sensor at the air outlet of the air duct (3) and the wind deflector (4); S7: Fixing the air duct and sensor cable: connect the air duct (3) and fix the sensor cable and power cable inside the blade; S8: bracket hand lay-up fixation: place the bracket at the designated position on the leading edge of the blade root (11); S9: Hot air blower installation and cable arrangement: Assemble the blower (1) and heater (2) into a hot air blower and fix it on the bracket, and arrange the cables.

2. A method for increasing power and deicing wind turbine blades according to claim 1, characterized in that: In S1, the specific steps for analyzing on-site wind resources and calculating parameters are as follows: Wind resource data collection and analysis: Select measurement equipment: Collect data using wind field measurement equipment such as anemometers and wind vanes; Data collection: set data collection periods to cover different seasons and weather conditions; Data preprocessing: clean up outliers, fill in missing values, and perform data quality assessment; Data analysis: Draw wind speed frequency distribution maps and wind rose diagrams, use GIS to build digital terrain models and three-dimensional wind energy resource distribution maps, and use big data analysis tools to discover patterns in the data; Calculate key parameters: Wind pressure calculation: Wind pressure is one of the important parameters in wind turbine blade design. Its calculation formula is: Where P is wind pressure, ρ is air density, which varies with altitude and temperature, and u is wind speed; Torque calculation: Torque is a key factor in wind turbine output power. It is related to wind speed and blade characteristics and is calculated based on power and speed: Where T is the torque, P is the output power of the wind turbine, and ω is the angular velocity of the wind rotor; Power curve calculation: The power curve is a curve that describes the output power of a wind turbine at different wind speeds and is obtained through experimental data or numerical simulation; Evaluate the impact of blade extension on unit performance: Theoretical calculation: Based on the new blade length, recalculate the wind pressure, torque and power curves, considering the impact of the increased blade length on the starting wind speed, maximum power point and mechanical load; Numerical simulation: simulate the aerodynamic performance of blades under different wind speeds and wind directions; Economic evaluation: Considering the manufacturing cost, installation cost, and operational benefits of blade extension, evaluate the increase in power generation and overall economic feasibility after blade extension; Field test: Conduct field tests to verify the results of theoretical calculations and numerical simulations; Summary and suggestions: Based on the analysis results, the specific impact of blade extension on unit performance is summarized, and suggestions for optimizing design and operation strategies are put forward.

3. The method for increasing power and removing ice from wind turbine blades according to claim 2, characterized in that: In S3, the specific steps for implementing the on-site blade extension technical modification are: Tip cutting: cutting the tip of the original leaf (8); Grinding and cleaning of bonding area: Grind and clean the bonding area; Bonding a temperature monitoring device at the blade tip: Installing a temperature and flow monitoring device (7) at the blade tip (8); Blade tip extension section bonding: using adhesive to bond the blade tip extension section (12) to the blade root (11) and the blade tip (8); Pre-curing and hand lay-up reinforcement: Improve bonding quality through pre-curing and hand lay-up reinforcement; Post-curing and post-treatment: Post-curing treatment is carried out to ensure that the bonding strength meets the design requirements.

4. The method for increasing power and removing ice from wind turbine blades according to claim 3, characterized in that: In S4, the specific steps of blade rotation positioning are: Precise pitch control: Pitch the blades until they are parallel to the ground with the SS facing downwards, i.e. the web is perpendicular to the ground; Locking the blades: After completing the pitch change, use the safety locking device to lock the blades and impeller.

5. The method for increasing power and removing ice from wind turbine blades according to claim 1, characterized in that: In S5, the specific steps for polishing and installing position marks are as follows: Air duct installation position mark: Install the air duct (3) at the corner where the blade leading edge channel (5) contacts the blade SS surface; Grinding position: Grind the installation position of the blower (1) and the heater (2) from the starting point of the blade root web (14) at the inner leading edge of the blade root web (14).

6. The method for increasing power and removing ice from wind turbine blades according to claim 1, characterized in that: In S6, the specific steps for installing the air outlet sensor and air dam are as follows: Sensor installation: Install two sensors at the air outlet of the air duct (3) and fix them on the blade root web (14) using structural adhesive and glass fiber cloth to monitor the air outlet temperature. Installation of windshield: After the windshield (4) is assembled, it is installed transversely at a designated position of the inner cavity of the leading edge of the blade root (11), and the sensor lead is routed through the air duct hole reserved in the windshield (4).

7. The method for increasing power and removing ice from wind turbine blades according to claim 1, characterized in that: In S8, the specific steps for bracket hand lay-up are as follows: Hot air blower installation: Assemble the blower (1) and the heater (2) brackets; Bracket fixing: the bracket is placed at the designated position of the leading edge of the blade root (11), the bracket is placed at the designated position of the leading edge of the blade root (11), and the paste is carried out in a way of covering the small with the large, and the final paste size exceeds the bottom of the bracket on all sides.

8. The method for increasing power and removing ice from wind turbine blades according to claim 1, characterized in that: In S9, the specific steps for installing the hot air blower and organizing the cables are as follows: Hot air blower installation: Assemble the blower (1) and the heater (2) into a hot air blower, align the hot air blower with the holes on the bracket and fasten them with bolts; Cable arrangement: All cables are arranged and fixed with structural adhesive and resin by hand paste. Power cables and signal cables are bundled separately and arranged separately on the inner wall of the blade. Cable lead-out: Drill a hole on the blade root (11) baffle and install a corrugated tube, and lead the cable out of the corrugated tube.

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