A fan torque regulation system based on actual aerodynamic coefficients

Abstract

The present invention belongs to the field of wind power generation system control, and discloses a fan torque regulation system based on actual aerodynamic coefficients, which includes a fan blade information collection module, an aerodynamic coefficient calculation module, a power regulation module, and a host computer module. The power regulation module includes a torque adjustment unit and a control unit connected to each other. The fan blade information collection module is connected to the aerodynamic coefficient calculation module, and the host computer module and the aerodynamic coefficient calculation module are respectively connected to the torque adjustment unit. The fan blade information collection module is used to identify the geometric shape data of the fan blades. The aerodynamic coefficient calculation module is used to calculate the corresponding actual aerodynamic coefficients according to the geometric shape data of the fan blades. The host computer module is used to input information on the required change in fan power. The torque adjustment unit calculates the actual torque required by the fan based on the actual aerodynamic coefficients, the fan motor speed information, and the information on the required change in fan power. The control unit adjusts the fan torque based on the real-time torque required by the fan.

Description

Technical Field

[0001] The present invention belongs to the field of wind power generation system control, and specifically relates to a fan torque regulation system based on actual aerodynamic coefficients. Background Art

[0002] Wind energy is a clean energy source and is widely developed and utilized due to its advantages of being pollution-free and renewable. However, due to the characteristics of wind being uncertain and difficult to predict, the utilization rate of wind energy is relatively low. To maximize the acquisition of wind energy, it is necessary to dynamically adjust the maximum output power of the wind power system according to the actual wind speed. However, the current control systems of wind turbines have problems such as single function, insufficient accuracy, and high manufacturing costs, making it difficult to achieve efficient utilization of wind energy and seriously affecting the development of wind power technology.

[0003] Currently, the solution to the above problems is to couple the original motor control system through a parameterized power regulator to dynamically adjust the output torque of the system, thereby enabling the maximum output power of the wind power generation system to change in real time and achieving the maximization of wind energy utilization efficiency. However, since one of the parameters in the parameterized power regulator is the aerodynamic coefficient, which varies non-linearly with the pitch angle and tip speed ratio, it is difficult to obtain the true value. And the existing power regulators did not consider this coefficient during the initial design or defaulted it as a known value, which undoubtedly makes the output parameters of the controller inaccurate and unable to dynamically adjust the maximum output power of the wind power system. Summary of the Invention

[0004] In view of the above problems existing in the prior art, the present invention provides a fan torque regulation system based on actual aerodynamic coefficients, which optimizes the control system through a power regulation module incorporating the true aerodynamic coefficient, ensuring that the control system responds quickly and outputs precisely, and providing technical support for the state detection and fault diagnosis of future fan systems.

[0005] The present invention adopts the following technical solutions:

[0006] A fan torque regulation system based on actual aerodynamic coefficients, including a fan blade information collection module, an aerodynamic coefficient calculation module, a power regulation module, and a host computer module. The power regulation module includes a torque adjustment unit and a control unit connected to each other. The fan blade information collection module is connected to the aerodynamic coefficient calculation module, and the host computer module and the aerodynamic coefficient calculation module are respectively connected to the torque adjustment unit;

[0007] The fan blade information collection module is used to identify the geometric shape data of the fan blades;

[0008] The aerodynamic coefficient calculation module is used to calculate the corresponding actual aerodynamic coefficient according to the geometric shape data of the fan blades;

[0009] The host computer module is used to input information on the required change in fan power;

[0010] The torque adjustment unit calculates the actual torque required by the fan based on the actual aerodynamic coefficient, the fan motor speed information, and the fan power change demand information;

[0011] The control unit adjusts the fan torque based on the real-time torque required by the fan.

[0012] As a preferred solution, the specific method for the aerodynamic coefficient calculation module to calculate the corresponding actual aerodynamic coefficient according to the geometric shape data of the fan blades is to divide the identified geometric shape of the fan blades into multiple airfoil section thin slices, compare the airfoil section shape with the section shapes in the known blade library, and select the closest set of data to generate the actual aerodynamic coefficient.

[0013] As a preferred solution, the power control module further includes a connected judgment unit and a motor speed adjustment unit, and the judgment unit and the motor speed adjustment unit are respectively connected to the torque adjustment unit;

[0014] The judgment unit is used to judge whether the real-time torque required by the fan calculated by the torque adjustment unit exceeds the adjustable range of the fan torque;

[0015] The motor speed adjustment unit is used to compensate the motor speed when the real-time torque required by the fan calculated exceeds the adjustable range of the fan torque to obtain the compensated motor speed;

[0016] The torque adjustment unit also calculates the compensated real-time torque required by the fan based on the real-time aerodynamic coefficient, the compensated motor speed information, and the fan power change demand information.

[0017] As a preferred solution, the calculation method of the motor speed compensation is as follows:

[0018] When the real-time torque required by the fan calculated by the torque adjustment unit exceeds the adjustable range of the fan torque, the motor speed adjustment unit calculates a motor speed change amount △ω according to the power change demand, the original motor torque, and the pitch controller △β determined by the integral gain and the proportional gain;

[0019] Through the gain compensation coefficient K calculated according to the actual aerodynamic coefficient GS , the motor speed change amount △ω calculated by the pitch controller △β is optimized to obtain the optimized motor speed change amount △ω';

[0020] According to the motor speed change amount △ω' and the original motor speed ω, the compensated motor speed ω0 is obtained, and the compensated motor speed ω0 is input to the torque adjustment unit to calculate the compensated real-time torque required by the fan.

[0021] As a preferred solution, the calculation formula for the motor speed change amount △ω is:

[0022] △ω = K P +(K I K P ) / s,

[0023] wherein, K P is the proportional gain, K I is the integral gain, and s is the integral gain factor.

[0024] As an optimized solution, the calculation formula for the gain compensation coefficient K GS is:

[0025]

[0026] The calculation formula for the optimized change in motor speed △ω' is:

[0027] △ω' = △ω × K GS ,

[0028] i.e.:

[0029]

[0030] wherein, is the wind speed calculated according to the actual aerodynamic coefficient, ω rated is the rated speed of the system, and ω is the original motor speed.

[0031] As an optimized solution, the system further includes a fan drive simulation test module. The fan drive simulation test module includes a motor drive unit and a simulation test path; the motor drive unit is respectively connected to the control unit and the torque adjustment unit, and the simulation test path is connected to the host computer module;

[0032] The motor drive unit is used to work by receiving the compensated real-time torque required by the fan output by the control unit, and at the same time, it transmits the motor speed signal back to the torque adjustment unit to form a feedback control;

[0033] The simulation test path is used to receive the compensated real-time torque required by the fan transmitted by the motor drive module to simulate the actual working condition of the fan motor under the actual working condition after receiving the compensated real-time torque required by the fan, and obtain the actual power according to the actual working condition of the fan motor, and transmit the actual power to the host computer module;

[0034] The host computer module is used to verify the accuracy of the compensated real-time torque required by the fan according to the information of the required change in fan power input by the user and the actual power.

[0035] As a preferred solution, the simulation test path includes a bearing simulation test path and a gear simulation test path. The bearing simulation test path is used to simulate the actual working conditions of a bearing-type fan, and the gear simulation test path is used to simulate the actual working conditions of a gear-type fan.

[0036] As a preferred solution, the host computer module is used to verify the accuracy of the real-time required torque of the fan after compensation according to the difference between the required information for changing the fan power input manually and the actual power.

[0037] As a preferred solution, the fan blade information collection module uses lidar scanning to identify the geometric shape data of the fan blades.

[0038] The beneficial effects of the present invention are as follows:

[0039] 1. Through the fan blade information collection module of the present invention, the geometric shape data of the fan blades is identified, and the corresponding actual aerodynamic coefficient is calculated according to the geometric shape data of the fan blades. The torque output by the control unit incorporates the actual aerodynamic coefficient, making the output torque more accurate and achieving a more accurate control effect.

[0040] 2. The present invention sets a torque adjustment unit that integrates the real aerodynamic coefficient. By setting a motor speed adjustment unit, when the real-time required torque of the fan calculated by the torque adjustment unit exceeds the adjustable range of the fan torque, the motor speed is compensated to obtain the compensated real-time required torque of the fan that meets the power change requirement, enabling the control unit to respond quickly, making the output torque more accurate, enhancing the control ability of the system, and having a low transformation cost at the same time.

[0041] 3. The fan drive simulation test module of the present invention conducts a simulation test on the compensated real-time required torque of the fan output by the control unit. The simulation test path transmits the actual working torque in the test to the host computer module. The host computer module verifies the accuracy of the compensated real-time required torque of the fan finally output by the control unit by comparing the required information for changing the fan power input manually and the difference between the actual powers, and at the same time provides technical support for the subsequent system state monitoring and fault diagnosis under different working conditions.

[0042] 4. The present invention can achieve that the error between the required information for changing the fan power input manually and the actual power is within 3%. Description of the Drawings

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0044] Figure 1 It is a schematic diagram of the overall relationship of a fan torque regulation system based on actual aerodynamic coefficients.

[0045] Figure 2 It is a schematic diagram of the real-time required torque of the fan calculated after the motor speed regulation unit and the torque regulation unit are calculated and compensated.

[0046] Figure 3 It is an assembly drawing of the fan drive simulation test module.

[0047] The codes in the figure are: 1. Asynchronous motor; 2. Gear transmission system; 3. Bearing simulation test path; 3-1. Torque sensor; 3-2. Bearing and bearing housing; 3-3. Eccentric disk; 3-4. Stepped shaft; 4. Gear simulation test path; 4-1. Torque sensor; 4-2. Gear reducer; 4-3. Magnetic powder brake. Specific implementation manners

[0048] The following illustrates the implementation manners of the present invention through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following examples and the features in the examples can be combined with each other.

[0049] Refer to Figure 1 , a fan torque regulation system based on actual aerodynamic coefficients, characterized in that it includes a fan blade information collection module, an aerodynamic coefficient calculation module, a power regulation module, and a host computer module. The power regulation module includes a connected torque regulation unit and a control unit. The fan blade information collection module is connected to the aerodynamic coefficient calculation module, and the host computer module and the aerodynamic coefficient calculation module are respectively connected to the torque regulation unit;

[0050] The fan blade information collection module is used to identify the geometric shape data of the fan blade;

[0051] The aerodynamic coefficient calculation module is used to calculate the corresponding actual aerodynamic coefficient according to the geometric shape data of the fan blade;

[0052] The host computer module is used to input the information of the required change in fan power;

[0053] The torque regulation unit calculates the actual required torque of the fan based on the actual aerodynamic coefficient, the fan motor speed information, and the information of the required change in fan power;

[0054] The control unit adjusts the fan torque based on the real-time required torque of the fan.

[0055] Furthermore, in this embodiment, the fan blade shape recognition module uses lidar. The accuracy of the lidar is 2.5 mm 3D position accuracy at a scanning distance of 100 m; the number of lidars is three, and the placement positions are set at positions 100 meters to 115 meters away from the wind turbine to ensure good incident angles for the collected data. The specific scanning method is as follows: First, pause the operation of the fan to obtain the precise blade geometry. Second, align the midline of a certain blade with the 6 o'clock position and mark it. Then scan the blade at this position, and finally scan the other two blades to ensure the accuracy of the data. Each lidar scan takes 10 to 15 minutes, and about 1.2 million points are collected each time; when scanning, a typical aerodynamic model is used, that is, 12 parts of the blade are scanned each time to meet the requirements of subsequent analysis.

[0056] Furthermore, the specific method for the aerodynamic coefficient calculation module to calculate the corresponding actual aerodynamic coefficient based on the geometric shape data of the fan blade is to divide the recognized geometric shape of the fan blade into 12 airfoil section thin slices, compare the airfoil section shape with the section shapes in the known blade library, and select the closest set of data to generate the actual aerodynamic coefficient.

[0057] Furthermore, the power regulation module further includes a connected judgment unit and a motor speed regulation unit. The judgment unit and the motor speed regulation unit are respectively connected to the torque regulation unit;

[0058] The judgment unit is used to judge whether the real-time required torque of the fan calculated by the torque regulation unit exceeds the adjustable range of the fan torque;

[0059] The motor speed regulation unit is used to compensate the motor speed when the real-time required torque of the fan calculated exceeds the adjustable range of the fan torque to obtain the compensated motor speed;

[0060] The torque regulation unit further calculates the compensated real-time required torque of the fan based on the real-time aerodynamic coefficient, the compensated motor speed information, and the fan power change demand information.

[0061] Furthermore, the relationship between the motor speed regulation unit and the torque regulation unit refers to Figure 2 As shown, the calculation method of the motor speed compensation is as follows:

[0062] When the real-time required torque of the fan calculated by the torque regulation unit exceeds the adjustable range of the fan torque, the motor speed regulation unit calculates a motor speed change amount △ω according to the power change demand, the original motor torque, and the pitch controller △β determined by the integral gain and the proportional gain;

[0063] The gain compensation coefficient K obtained by calculating according to the actual aerodynamic coefficient GS is used to optimize the motor speed change Δω calculated by the blade pitch controller Δβ to obtain the optimized motor speed change Δω';

[0064] According to the motor speed change Δω' and the original motor speed ω, the compensated motor speed ω0 is obtained, and the compensated motor speed ω0 is input into the torque adjustment unit to calculate the compensated real-time torque required by the fan.

[0065] Furthermore, the calculation formula for the motor speed change Δω is:

[0066] Δω = K P +(K I K P ) / s,

[0067] where K P is the proportional gain, K I is the integral gain, and s is the integral gain factor.

[0068] Furthermore, the calculation formula for the gain compensation coefficient K GS is:

[0069]

[0070] The calculation formula for the optimized motor speed change Δω' is:

[0071] Δω' = Δω × K GS ,

[0072] That is:

[0073]

[0074] where is the wind speed calculated according to the actual aerodynamic coefficient, ω rate d is the rated speed of the system, and ω is the original motor speed.

[0075] Specifically:

[0076] To keep the closed-loop system stable, the change rate of the blade pitch controller Δβ is set to be lower than 0.5 degrees / second. To ensure that the error of Δω is not too large, the bandwidth of the blade pitch controller Δβ is set to be greater than 1 revolution / second.

[0077] Furthermore, the system also includes a fan drive simulation test module. The fan drive simulation test module includes a motor drive unit and a simulation test path; the motor drive unit is respectively connected to the control unit and the torque adjustment unit, and the simulation test path is connected to the upper computer module;

[0078] The motor drive unit is used to receive the compensated real-time torque required by the fan output by the control unit for operation, and at the same time transmit the motor speed signal back to the torque adjustment unit to form a feedback control;

[0079] The simulation test path is used to receive the compensated real-time torque required by the fan transmitted by the motor drive module to simulate the actual working condition of the fan motor under the actual working condition after receiving the compensated real-time torque required by the fan, and obtain the actual power according to the actual working condition of the fan motor, and transmit the actual power to the host computer module;

[0080] The host computer module is used to verify the accuracy of the compensated real-time torque required by the fan according to the information on the required change in fan power input by humans and the actual power.

[0081] Furthermore, the simulation test path includes a bearing simulation test path and a gear simulation test path. The bearing simulation test path is used to simulate the actual working condition of a bearing-type fan, and the gear simulation test path is used to simulate the actual working condition of a gear-type fan.

[0082] Specifically:

[0083] Refer to Figure 3 , in this embodiment, the motor drive unit includes an asynchronous motor 1 and a gear drive system 2. The gear drive system divides the torque into two simulation test paths, which are the bearing simulation test path 3 and the gear simulation test path 4. The bearing simulation test path 3 includes a torque sensor 3-1, a bearing and bearing housing 3-2, an eccentric disc 3-3, and a stepped shaft 3-4; the gear simulation test path includes a torque sensor 4-1, a gear reducer 4-2, and a magnetic powder brake 4-3; the eccentric disc 3-3 and the magnetic powder brake 4-3 have the function of adjusting the torque of the test system.

[0084] In this embodiment, the specific parameters of the two simulation test paths are as follows:

[0085] The parameters of the torque sensor 3-1 and the torque sensor 4-1 are: the torque range is 20 N·m, the speed range is 6000 rpm, and the number of wires is 60; the parameters of the magnetic powder brake 4-3 are: the rated torque is 2.5 (25) kgf / m (N-m), and the power is 30 W; the eccentric disc 3-3 has 24 threaded holes distributed in a circumferential array, and the torque can be changed by adding special weights to enhance the flexibility of the experiment.

[0086] Furthermore, the host computer module is used to verify the accuracy of the compensated real-time torque required by the fan according to the difference between the information on the required change in fan power input by humans and the actual power.

[0087] Specifically:

[0088] The upper computer subsystem includes a main thread and a communication thread. The main thread is used for constructing the graphical interface, synchronizing the operations of the operator, processing information, and communicating with the aerodynamic coefficient calculation module and the torque adjustment unit. The communication thread is used for receiving the real-time torque output by the fan drive simulation test module and sending the data to the main thread. The main thread and the communication thread of the upper computer module achieve communication through information transmission to achieve the fast response of the upper computer subsystem.

[0089] The embodiments described above are only used to describe the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope of the present invention.

Claims

1. A fan torque regulation system based on actual aerodynamic coefficients, characterized in that, It includes a fan blade information collection module, an aerodynamic coefficient calculation module, a power regulation module, and a host computer module. The power regulation module includes a connected torque adjustment unit and a control unit. The fan blade information collection module is connected to the aerodynamic coefficient calculation module, and the host computer module and the aerodynamic coefficient calculation module are respectively connected to the torque adjustment unit; The fan blade information collection module is used to identify the geometric shape data of the fan blade; The aerodynamic coefficient calculation module is used to calculate the corresponding actual aerodynamic coefficient according to the geometric shape data of the fan blade; The host computer module is used to input the information of the required change in fan power; The torque adjustment unit calculates the actual torque required by the fan based on the actual aerodynamic coefficient, the fan motor speed information, and the information of the required change in fan power; The control unit adjusts the fan torque based on the real-time torque required by the fan; The power regulation module further includes a connected judgment unit and a motor speed adjustment unit. The judgment unit and the motor speed adjustment unit are respectively connected to the torque adjustment unit; The judgment unit is used to judge whether the real-time torque required by the fan calculated by the torque adjustment unit exceeds the adjustable range of the fan torque; The motor speed adjustment unit is used to compensate the motor speed when the calculated real-time torque required by the fan exceeds the adjustable range of the fan torque to obtain the compensated motor speed; The torque adjustment unit further calculates the compensated real-time torque required by the fan based on the real-time aerodynamic coefficient, the compensated motor speed information, and the information of the required change in fan power; The calculation method of the motor speed compensation is as follows: When the real-time torque required by the fan calculated by the torque adjustment unit exceeds the adjustable range of the fan torque, the motor speed adjustment unit calculates a motor speed change amount Δω according to the integral gain and the proportional gain; Through the gain compensation coefficient K calculated according to the actual aerodynamic coefficient GS , the change in motor speed Δω is optimized to obtain the optimized change in motor speed Δω'; According to the motor speed change amount Δω' and the original motor speed ω, the compensated motor speed ω0 is obtained, and the compensated motor speed ω0 is input into the torque adjustment unit to calculate the compensated real-time torque required by the fan.

2. The fan torque regulation system based on the actual aerodynamic coefficient according to claim 1, characterized in that The specific method for the aerodynamic coefficient calculation module to calculate the corresponding actual aerodynamic coefficient according to the geometric shape data of the fan blade is to divide the identified geometric shape of the fan blade into multiple airfoil section thin slices, compare the airfoil section shape with the section shapes in the known blade library, and select the closest set of data to generate the actual aerodynamic coefficient.

3. The fan torque regulation system based on the actual aerodynamic coefficient according to claim 1, characterized in that The calculation formula for the motor speed change amount Δω is: Δω = K P +(K I K P ) / s, Among them, K P is the proportional gain, K I is the integral gain, and s is the integral gain factor.

4. The fan torque regulation system based on the actual aerodynamic coefficient according to claim 3, characterized in that, Gain compensation coefficient K GS The calculation formula is as follows: The calculation formula for the optimized motor speed change amount Δω' is: Δω' = Δω × K GS , That is: Among them, is the wind speed calculated according to the actual aerodynamic coefficient, ω rated is the rated speed of the system, and ω is the speed of the original motor.

5. A fan torque regulation system based on actual aerodynamic coefficients according to claim 1, characterized in that, The system further includes a fan drive simulation test module. The fan drive simulation test module includes a motor drive unit and a simulation test path; the motor drive unit is respectively connected to the control unit and the torque adjustment unit, and the simulation test path is connected to the host computer module; The motor drive unit is used to work by receiving the compensated real-time torque required by the fan output by the control unit, transmit the compensated real-time torque required by the fan to the simulation test path, and feedback the motor speed signal to the torque adjustment unit to form a feedback control; The simulation test path is used to receive the compensated real-time torque required by the fan transmitted by the motor drive module to simulate the actual working conditions of the fan motor under actual working conditions after receiving the compensated real-time torque required by the fan, and obtain the actual power according to the actual working conditions of the fan motor, and transmit the actual power to the host computer module; The host computer module is used to verify the accuracy of the compensated real-time torque required by the fan according to the fan power change demand information and the actual power input manually.

6. The fan torque regulation system based on the actual aerodynamic coefficient according to claim 5, characterized in that, The simulation test path includes a bearing simulation test path and a gear simulation test path. The bearing simulation test path is used to simulate the actual working conditions of the bearing type fan, and the gear simulation test path is used to simulate the actual working conditions of the gear type fan.

7. A fan torque regulation system based on actual aerodynamic coefficients according to claim 5, characterized in that The host computer module is used to verify the accuracy of the compensated real-time torque required by the fan according to the difference between the fan power change demand information input manually and the actual power.

8. A fan torque regulation system based on actual aerodynamic coefficients according to claim 1, characterized in that, The fan blade information collection module uses lidar scanning to identify the geometric shape data of the fan blade.

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