A wind turbine-based mechanical-hydraulic coupler and its matching and adjustment method

Abstract

This invention discloses a wind turbine-based electro-hydraulic coupler and its matching and adjustment method, belonging to the fields of mechatronics and hydraulic transmission technology. The invention includes: a wind turbine, a fixed-ratio gearbox, a variable pump, an accumulator, an overflow valve, a variable motor, an electric motor, a first clutch, a second clutch, a third clutch, a coupler output shaft, and a torque coupling gear set. The variable pump, accumulator, overflow valve, and variable motor together form a closed hydraulic circuit. The output power of the wind turbine and the electric motor is coupled by the torque coupler, driving the load through the coupler output shaft. This invention, through a wind turbine-based electro-hydraulic coupler, can maximize the utilization of wind energy when wind speed changes, thereby minimizing the output power of the motor and achieving energy conservation.

Description

Technical Field

[0001] This invention relates to the fields of green energy utilization, mechatronics and hydraulic transmission technology, and in particular to a method for driving a load and adjusting the load through power coupling between a wind turbine and an electric motor, specifically to a mechanical-hydraulic coupler based on wind turbine power and its matching and adjustment method. Background Technology

[0002] Statistics show that my country's large-scale industrial systems (such as oil extraction projects, mining and metal smelting projects) consume tens of billions of kilowatt-hours of electricity annually, resulting in annual electricity expenditures of billions of yuan, indicating a huge potential for energy conservation and emission reduction. Especially in remote areas of my country, significant energy losses occur during power transmission, leading to high electricity costs and low energy utilization rates. In contrast, wind power, as a renewable and clean resource, has significant advantages in terms of low operating costs and wide resource distribution. Therefore, utilizing abundant wind energy resources in remote areas to replace electricity for equipment drive has become a development direction for modern industrial energy conservation. However, due to the significant randomness and instability of wind speed, single-energy drive systems struggle to achieve stable, continuous, and efficient power supply when facing periodic or dynamically changing loads. Therefore, combining the stability of electric drive with the energy efficiency of wind drive to develop wind-electric hybrid drive systems has become an important technological path to improve energy utilization efficiency and reduce operating costs. However, to improve wind energy capture capabilities, optimal power point tracking (DPPT) control is necessary. In wind-powered hybrid systems, by changing the displacement of the variable pump, the rotor speed and power can be adjusted, allowing the motor output power to adaptively follow the dynamic changes in wind power. This is crucial for reducing motor power consumption and improving system energy efficiency. However, ensuring optimal DPPT and coordinating the power distribution between wind and electricity to achieve precise power matching and dynamic adjustment of the load remain significant technical challenges.

[0003] Existing research on optimal power matching and regulation methods for wind power hybrid systems, both domestically and internationally, mainly focuses on optimizing maximum power point tracking (MPPT) strategies and power management mechanisms on both sides of the wind turbine. In wind power hybrid systems, some researchers have attempted to coordinate the output power of wind and electricity using methods such as fixed-ratio allocation, rule-based control, and model predictive control. However, these methods face problems such as poor real-time performance, energy retention, and control instability, making it difficult to meet the demands for high precision and dynamic response under complex load scenarios. On the other hand, hydraulic variable displacement pumps / motors, due to their adjustable output and fast response, have been introduced as power regulation media to achieve matching between turbine speed and load characteristics. However, existing control strategies mostly remain at the level of static regulation or linear control, and an adaptive nonlinear regulation mechanism for dynamic load conditions has not yet been formed. Therefore, for wind power hybrid drive systems, how to achieve efficient wind energy capture, flexible electrical energy compensation, and adaptive dynamic matching between power output and load demand still requires in-depth research and technological breakthroughs. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a wind turbine-based hydraulic coupler and its matching and adjustment method, which aims to achieve efficient wind energy capture, optimal wind power adjustment, and output torque coupling of wind-powered joint drive under conditions of wind speed variation and load disturbance, thereby improving the overall energy efficiency of the system and reducing motor energy consumption.

[0005] The objective of this invention is achieved through the following technical solution: a wind turbine-powered hydraulic coupling, comprising: a wind turbine, a fixed-ratio gearbox, a variable-ratio pump, a variable-ratio motor, an electric motor, a first clutch, a second clutch, a third clutch, a coupling output shaft, and a torque coupling gear set; the wind turbine is connected to the fixed-ratio gearbox, which is connected to the variable-ratio pump, thereby ensuring that the operating speed ranges of the wind turbine and the variable-ratio pump are consistent; the variable-ratio pump is connected to the variable-ratio motor, forming a closed hydraulic circuit; the variable-ratio pump converts the mechanical power of the wind turbine into hydraulic power, and the variable-ratio motor converts the hydraulic power into mechanical power; the variable-ratio motor is connected to the first gear in the torque coupling gear set, and a second clutch is provided between the variable-ratio motor and the torque coupling gear set; the second gear in the torque coupling gear set is connected to the coupling output shaft, and a third clutch is provided between the second gear in the torque coupling gear set and the coupling output shaft; the third gear in the torque coupling gear set is connected to the electric motor, and a first clutch is provided between the third gear in the torque coupling gear set and the electric motor.

[0006] Furthermore, the output power of the wind turbine is converted from mechanical to hydraulic to mechanical power through a variable pump and a variable motor. After being coupled with the output power of the electric motor through a torque coupling gear set, the load is driven by the output shaft of the coupler, realizing the joint drive of the wind turbine and the electric motor on the load.

[0007] Furthermore, the variable pump is also used to adjust the output load torque of the wind turbine by adjusting the displacement of the variable pump according to the different wind speeds flowing through the wind turbine blades, so that the wind turbine can operate at the maximum output power condition.

[0008] Furthermore, the output shaft speed is adjusted by regulating the displacement of the variable motor to match the desired speed of the load driven by the coupler output shaft.

[0009] Furthermore, the closed hydraulic circuit includes an overflow valve for providing overload protection.

[0010] Furthermore, the closed hydraulic circuit includes an accumulator for providing energy buffering.

[0011] Furthermore, the coupler includes a speed sensor and a torque sensor for acquiring the speed and torque of the wind turbine output shaft and the coupler output shaft.

[0012] Furthermore, the coupler includes a control system for real-time adjustment of the displacement of the variable pump and the variable motor.

[0013] The present invention also provides a matching and adjustment method for a wind turbine-driven hydraulic coupling, comprising the following steps:

[0014] The speed and torque of the fan output shaft are obtained in real time by speed sensors and torque sensors, and the output power is calculated.

[0015] Based on the wind turbine aerodynamic model, the wind speed is calculated according to the output power.

[0016] Calculate the current tip speed ratio based on the wind speed.

[0017] Using pump displacement as a variable, a state-space prediction model for the fan is constructed to obtain the impact of pump displacement on the fan speed.

[0018] The optimal pump displacement is obtained by predicting and optimizing the pump displacement based on a robust model.

[0019] The optimal pump displacement is input into the hydraulic control system to control the variable pump load, thereby adjusting the wind turbine resistance torque and indirectly regulating the wind turbine speed, so that the system converges to the optimal operating point.

[0020] Adjusting the displacement of the variable motor dynamically matches the wind power output with the load speed. Calculating whether the wind power can independently meet the load power, if so, the motor is in standby mode; if not, the motor compensates for the insufficient wind power.

[0021] By coupling the torque output from the fan and the motor through a coupler, the power fusion of electric and wind sources is achieved.

[0022] Further, calculating the current tip speed ratio based on the wind speed includes: identifying the optimal tip speed ratio, setting it as the optimal target, and converging the current tip speed ratio to the optimal tip speed ratio.

[0023] Furthermore, the method of predicting and optimizing pump displacement based on a robust model includes setting robustness constraints to ensure that the system operates stably and the power output is not lower than a set lower limit under the condition that wind speed disturbance exists.

[0024] Furthermore, the method of adjusting the variable displacement of the motor to dynamically match the wind power output with the load speed includes:

[0025] The actual speed and torque of the output coupler shaft are obtained in real time by speed and torque sensors, and the output power required for the current load is calculated.

[0026] Based on the required output power, the current tip speed ratio of the wind turbine blades is controlled within the preset range of the optimal tip speed ratio of the wind turbine blades.

[0027] Adjust the variable displacement motor to match the load speed.

[0028] Furthermore, the method includes controlling the torque at the output terminals of the fan, motor, and coupler via a clutch.

[0029] The beneficial effects of this invention are as follows: This invention proposes a wind energy maximum power point tracking and hybrid drive power regulation method based on model predictive control, which can maximize wind energy utilization efficiency even when the variable pump displacement is limited and wind speed estimation is inaccurate. Optimal tip speed ratio control is achieved by inversely estimating wind speed from output power and optimizing the variable pump displacement; further, the variable motor displacement is adjusted to dynamically match wind energy output with the load, with the motor only compensating when wind energy is insufficient, effectively improving system energy efficiency. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the device structure;

[0032] Figure 2 Here are the characteristic curves of the wind turbine; where (a) is the output power curve of the wind turbine and (b) is the aerodynamic torque curve of the wind turbine.

[0033] In the diagram, 1 is a wind turbine, 2 is a fixed-ratio gearbox, 3 is a variable pump, 4 is an accumulator, 5 is an overflow valve, 6 is a variable motor, 7 is an electric motor, 8 is a first clutch, 9 is a second clutch, 10 is a third clutch, 11 is a coupler output shaft, and 12 is a torque coupling gear set. Detailed Implementation

[0034] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0035] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0036] It should be understood that although the terms first, second, third, etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first information may also be referred to as second information without departing from the scope of this invention, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to a determination."

[0037] The present invention will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0038] like Figure 1As shown in the figure, this embodiment of the invention proposes a wind turbine-based hydraulic coupling, comprising: a wind turbine 1, a fixed-ratio gearbox 2, a variable-ratio pump 3, an accumulator 4, an overflow valve 5, a variable-ratio motor 6, an electric motor 7, a first clutch 8, a second clutch 9, a third clutch 10, a coupling output shaft 11, and a torque coupling gear set 12; the wind turbine 1 is connected to the fixed-ratio gearbox 2, and the fixed-ratio gearbox 2 is connected to the variable-ratio pump 3, so that the operating speed ranges of the wind turbine 1 and the variable-ratio pump 3 are consistent through the fixed-ratio gearbox 2; the variable-ratio pump 3, the accumulator 4, the overflow valve 5, and the variable-ratio motor 6 are connected to the variable-ratio pump 3. Motor 6 is connected to form a closed hydraulic circuit; the variable motor 6 is connected to the first gear in the torque coupling gear set 12, and a second clutch 9 is provided between the variable motor 6 and the torque coupling gear set 12; the second gear in the torque coupling gear set 12 is connected to the output shaft 11 of the coupler, and a third clutch 10 is provided between the second gear in the torque coupling gear set 12 and the output shaft 11 of the coupler; the third gear in the torque coupling gear set 12 is connected to the motor 7, and a first clutch 8 is provided between the third gear in the torque coupling gear set 12 and the motor 7.

[0039] The mechanical-hydraulic coupler includes a speed sensor and a torque sensor, used to acquire the speed and torque of the wind turbine output shaft and the coupler output shaft.

[0040] The mechanical-hydraulic coupler includes a control system for real-time adjustment of the displacement of the variable pump 3 and the variable motor 6.

[0041] The working principle of the mechanical-hydraulic coupler based on wind turbine power proposed in this embodiment of the invention is as follows: A variable pump 3 converts the mechanical power of the wind turbine 1 into adjustable hydraulic power, and then a variable motor 6 converts the hydraulic power back into adjustable mechanical power. Depending on the wind speed flowing through the blades of the wind turbine 1, the output load torque of the wind turbine 1 is adjusted by regulating the displacement of the variable pump 3, thereby allowing the wind turbine 1 to operate at its maximum output power. The output power of the wind turbine 1, after mechanical-hydraulic-mechanical power conversion via the variable pump 3 and variable motor 6, is coupled with the output power of the electric motor 7 via a torque coupling gear set 12, and then drives the load through the coupler output shaft 11, achieving joint drive of the load by the wind turbine 1 and the electric motor 7. When wind energy increases, electrical energy decreases accordingly; when wind energy decreases, electrical energy increases accordingly. As long as the torque coupling condition is met, the power output of the electric motor 7 will automatically follow the changes in wind energy. In the absence of wind, only the electric motor 7 drives the load. If the wind energy reaches or exceeds the load power, the electric motor 7 can be shut down, and the load can be driven by the wind turbine 1. With a reasonable matching structure, wind energy utilization can reduce the annual power consumption of motors and improve energy-saving effects.

[0042] In a preferred embodiment, the mechanical-hydraulic coupling of the wind turbine power system regulates the speed and power of the wind turbine 1 mainly through the following processes during operation:

[0043] (1) When the wind speed changes below the rated wind speed, the wind turbine 1 is adjusted by maximum power tracking control;

[0044] (2) When the wind speed is above the rated wind speed, the following control process is adopted for the wind turbine 1 rotor speed adjustment: when the pressure of the closed hydraulic circuit does not reach the maximum pressure value, the maximum power tracking control of the wind turbine 1 continues. At this time, the hydraulic system stores energy until the pressure rises to the designed maximum pressure, which is conducive to the wind turbine 1 absorbing the maximum wind energy; when the pressure of the closed hydraulic system reaches the maximum value allowed by the design, the wind turbine 1 rotor performs constant power output control to meet the load power requirements.

[0045] (3) If the wind speed condition reaches below the rated wind speed again, the motor 7 does not need to be immediately connected to the system. Instead, the wind turbine 1 and the energy storage device 4 will supply energy to the system simultaneously until the system working pressure drops to the working pressure of the hybrid power condition. Then the motor 7 will be connected to the system to achieve the hybrid power condition for driving the load and achieve maximum power saving.

[0046] From the wind turbine characteristic curve, it can be seen that the wind turbine's wind energy capture power has a maximum value, which corresponds to the optimal value. , and When wind speed varies within a low wind speed range, for the wind turbine to capture maximum wind power, its rotational speed must maintain the optimal value corresponding to that wind speed. However, when the wind speed exceeds the rated wind speed, to achieve constant power output, the turbine's rotational speed must be kept stable near a set value to ensure constant output power. Therefore, the rotational speed range of the wind turbine varies with different wind speeds. Wind energy capture is achieved by controlling the wind turbine's rotational speed according to different energy demands. Furthermore, the aerodynamic torque variation of the wind turbine follows the same pattern as the wind turbine's wind energy capture curve.

[0047] Based on the wind turbine model, plot the output power and aerodynamic torque of the wind turbine at different wind speeds as a function of the rotor speed. The wind turbine characteristic curves are shown below. Figure 2 As shown in Figures (a) and (b).

[0048] This invention also provides a matching and adjustment method for a wind turbine-driven hydraulic coupling. Based on a model predictive control framework, and under the condition of limited variable pump displacement, the method achieves efficient utilization of wind energy and maximizes the output power of the wind turbine by adjusting the control input in real time. The method includes the following steps:

[0049] Step 1: Real-time power output measurement. The rotational speed of the wind turbine's output shaft is obtained using a speed sensor and a torque sensor, respectively. and torque Calculate the actual output power:

[0050] .

[0051] Step 2: Estimation method based on output power to deduce wind speed. According to the aerodynamic model of the wind turbine, theoretically, the wind turbine extracts wind energy from the air... It can be represented as:

[0052] .

[0053] in, It is the density of air, measured in kg·m / s 2 ; It is the radius of the wind turbine, in meters (m). It is wind speed, measured in m / s; It is the efficiency coefficient of the wind turbine; It is the wind energy utilization coefficient, which is related to the tip speed ratio. Related. Due to Simultaneously appearing in power functions and Among the independent variables, the equation cannot analytically solve for wind speed. Therefore, this invention introduces a method for inferring wind speed based on output power. The estimated wind speed is obtained by inferring the minimum deviation between the wind power model prediction and the measured output power. The following optimization problem needs to be satisfied:

[0054] .

[0055] Step 3: Tip speed ratio estimation and optimal target setting. Based on the back-calculated "equivalent wind speed"... Compared with the measured speed Estimate the current tip speed ratio:

[0056] .

[0057] Step 4: Based on the aerodynamic characteristics of the wind turbine, there exists a unique optimal tip speed ratio. This makes the wind energy utilization coefficient Maximum, denoted as The control objective is defined as: to make the estimated Converging to the theoretical optimal value This indirectly approximates the maximum wind energy utilization coefficient. This maximizes the output power.

[0058] Step 5: Predictive Model Construction and Constraint Modeling. Establish a state-space predictive model for the wind turbine system, using variable pump displacement... To control the quantity, model its impact on the wind turbine speed:

[0059] .

[0060] in, This represents the system uncertainty caused by the wind speed estimation error, assumed to be a bounded disturbance and satisfying... Simultaneously apply limits on the displacement range and displacement change rate of the variable pump:

[0061] .

[0062] in, It is the minimum displacement of the variable pump. It is the maximum displacement of the variable pump. It is the rate of change of maximum displacement.

[0063] Step Six: Robust Model Predictive Control. Design a robust model predictive controller to continuously optimize the adjustment of the variable pump displacement over the next N steps to approximate the optimal tip speed ratio. The objective function is as follows:

[0064] .

[0065] in, It is a penalty factor to prevent large fluctuations in pump displacement. Optimization constraints include: variable pump displacement limit; displacement change rate limit; robustness constraint to ensure stable system operation and power output not falling below the lower limit under the condition of disturbance.

[0066] Step 7: Control Execution and Closed-Loop Adaptive Update. The optimal variable pump displacement obtained at the current time step is... The input to the hydraulic control system controls the load on the variable pump, thereby adjusting the wind turbine resistance torque and indirectly regulating the wind turbine speed, causing the system to converge towards the optimal operating point. If detected... Long-term deviation If the wind speed estimation deviation is large, the wind speed estimation model is corrected by reverse correction of the output power deviation to ensure that the controller always operates within the robust range.

[0067] Step 8: Once the tip speed ratio of the wind turbine blades has been controlled to the optimal point, the maximum wind energy utilization coefficient is achieved. Under the premise of achieving efficient matching and dynamic transmission of wind power to the load side, the wind power output is further dynamically matched with the load speed by adjusting the displacement of the variable motor, and the motor compensates for the insufficient wind power when necessary, so as to achieve efficient and economical output power matching. The control steps are as follows:

[0068] (8.1) Real-time load status acquisition. A speed sensor and a torque sensor are installed on the load output shaft to acquire the actual speed of the output coupler shaft in real time. and torque And calculate the output power required by the current load. This serves as the basis for control and allocation.

[0069] (8.2) By implementing the control strategy for maximizing wind energy utilization, the tip speed ratio of the wind turbine blades is increased. Always maintained at Nearby, ensure wind power output. maximize.

[0070] (8.3) Adjust the displacement of the variable motor to match the load speed. Maintain the flow rate of the variable pump. When basically stable, the controlled variable is the motor displacement. satisfy:

[0071] .

[0072] This allows wind energy to be efficiently transferred to the load side via a hydraulic circuit, maximizing the utilization of wind power. Among these, It is the speed ratio of a fixed-ratio gearbox.

[0073] Step 9: Calculate whether wind power can independently meet the load power. Estimate the output power provided by wind power drive under the current variable displacement motor. Can it meet the load power requirements? If If the wind power is on standby, the electric motor remains in standby mode; otherwise, the electric motor compensates for the difference.

[0074] .

[0075] Step 10: The variable pump and motor driven by the wind turbine are connected to the input terminal of the variable motor and the input shaft of the coupler, respectively. The torque superposition between the motor output shaft and the wind power side output shaft is achieved by adjusting the displacement of the variable motor. The controller distributes the dual-channel output torque in real time, with the main output torque of the variable motor... The wind power side tries its best to bear the load; the electric motor supplements the torque. Only compensate for the insufficient portion, maintaining the minimum necessary output force. The coupler combines the output torques of both into the total driving torque of the coupler output shaft, i.e.:

[0076] .

[0077] To achieve the integration of wind and electric power sources, thereby reducing the burden on motors and achieving optimal energy allocation.

[0078] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only.

[0079] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. A hydro-mechanical coupling based on windmill power, characterized in that, The wind turbine (1), the constant ratio gearbox (2), the variable pump (3), the variable motor (6), the motor (7), the first clutch (8), the second clutch (9), the third clutch (10), the coupler output shaft (11) and the torque coupling gear set (12); the wind turbine (1) is connected with the constant ratio gearbox (2), the constant ratio gearbox (2) is connected with the variable pump (3), the working speed range of the wind turbine (1) and the variable pump (3) is consistent through the constant ratio gearbox (2); the variable pump (3) is connected with the variable motor (6), and a closed hydraulic circuit is formed; the variable pump (3) converts the mechanical power of the wind turbine (1) into hydraulic power, and the variable motor (6) converts the hydraulic power into mechanical power; the variable motor (6) is connected with the first gear in the torque coupling gear set (12), and the second clutch (9) is arranged between the variable motor (6) and the torque coupling gear set (12); the second gear in the torque coupling gear set (12) is connected with the coupler output shaft (11), and the third clutch (10) is arranged between the second gear in the torque coupling gear set (12) and the coupler output shaft (11); the third gear in the torque coupling gear set (12) is connected with the motor (7), and the first clutch (8) is arranged between the third gear in the torque coupling gear set (12) and the motor (7). The output power of the wind turbine (1) is mechanically-hydraulically-mechanically converted through the variable pump (3) and the variable motor (6), and is coupled with the output power of the motor (7) through the torque coupling gear set (12), and then the load is driven by the coupler output shaft (11), so that the wind turbine (1) and the motor (7) jointly drive the load.

2. The hydrodynamic coupling based on windmill power according to claim 1, characterized in that, The variable pump (3) is also used for adjusting the output load torque of the wind turbine (1) by adjusting the displacement of the variable pump (3) according to different wind speeds flowing through the blades of the wind turbine (1), so that the wind turbine (1) works in the maximum output power working condition.

3. The hydrodynamic coupling based on windmill power according to claim 1, characterized in that, The closed hydraulic circuit comprises an overflow valve (5) for providing overload protection.

4. The hydrodynamic coupling based on windmill power according to claim 1, characterized in that, The closed hydraulic circuit comprises an accumulator (4) for providing energy storage.

5. The hydrodynamic coupling based on windmill power according to claim 1, characterized in that, The coupler comprises a rotational speed sensor and a torque sensor for acquiring the rotational speed and torque of the wind turbine output shaft and the coupler output shaft (11).

6. The hydrodynamic coupling based on windmill power according to claim 1, characterized in that, The coupler comprises a control system for adjusting the displacement of the variable pump (3) and the variable motor (6) in real time.

7. The hydrodynamic coupling based on windmill power according to claim 1, characterized in that, The method comprises the following steps:

8. A matching adjustment method of a hydro-mechanical coupling based on wind turbine power, characterized in that, The rotational speed and torque of the wind turbine output shaft are acquired in real time through the rotational speed sensor and the torque sensor, and the output power is calculated; The wind speed is calculated according to the output power based on an aerodynamic model of the wind turbine; The current tip speed ratio is calculated according to the wind speed; A state space prediction model of the wind turbine is constructed with the pump displacement as a variable to acquire the influence of the pump displacement on the rotational speed of the wind turbine; The optimal pump displacement is obtained by optimizing the pump displacement based on a robust model prediction; The optimal pump displacement is input into the hydraulic control system to control the variable pump load, so as to adjust the wind turbine resistance torque, indirectly adjust the rotational speed of the wind turbine, and make the system converge to the optimal working point. ​ The adjusting variable motor displacement dynamically matches the wind energy output with the load rotating speed, calculates whether the wind energy can independently meet the load power, and if yes, the motor is standby, and if not, the motor compensates the insufficient wind energy part; The torque output by the fan and the motor is coupled through the coupling to realize the power fusion of the electric and wind dual sources.

9. The method of matching adjustment of a hydrodynamic coupling based on windmill power according to claim 8, characterized in that, The adjusting variable motor displacement dynamically matches the wind energy output with the load rotating speed, calculates whether the wind energy can independently meet the load power, and if yes, the motor is standby, and if not, the motor compensates the insufficient wind energy part; The actual rotating speed and torque of the output coupling shaft are acquired in real time through the rotating speed sensor and the torque sensor, and the required output power of the current load is calculated; Based on the required output power, the current wind turbine tip speed ratio is controlled within the preset range of the optimal wind turbine tip speed ratio; The adjusting variable motor displacement matches the load rotating speed.

10. The method of matching adjustment of a hydrodynamic coupling based on windmill power according to claim 8, wherein, The method comprises controlling the torque of the output end of the fan, the motor and the coupling through the clutch.

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