Double-impeller floating type draught fan pitching restraining and energy storing system based on rotating flywheel and operation method of double-impeller floating type draught fan pitching restraining and energy storing system

Abstract

The invention relates to a double-impeller floating type fan pitching restraining and energy storing system based on a rotating flywheel and an operation method. Flywheel energy storing and stabilizing devices are installed on two foundation bodies of a double-impeller floating type fan foundation, and a floating type fan is installed at the top of the flywheel energy storing and stabilizing devices; a motor stator of the flywheel energy storage stabilizing device is fixed at the bottom in a frame, a motor rotor vertically penetrates through the bottom of a flywheel, the center of the flywheel is sleeved on a motor shaft, a plurality of electromagnets are fixed at the top of the flywheel, and a magnetic induction coil is fixed in the frame at the top of the electromagnets; rotating shafts are symmetrically arranged on the outer wall of the frame and sleeved with bearings, and the bearings are installed and embedded in the inner wall of the foundation body through supports. The floating fan is electrically connected with the motor through a power transmission line; the rotation directions of the flywheels in the two flywheel energy storage stabilizing devices are opposite. According to the invention, the power transmission stability of the double-impeller floating type fan can be obviously enhanced, the fatigue load borne by the cabin and the tower part is effectively reduced, and a powerful guarantee is provided for efficient and reliable operation of offshore wind power.

Description

Technical Field

[0001] The present invention relates to a pitch suppression and energy storage system and an operation method for a double - impeller floating wind turbine based on a rotating flywheel, and relates to the technical field of energy storage and damping of an offshore power generation platform. Background Technique

[0002] As an important branch of the wind power industry in recent years, offshore wind power has developed rapidly. However, the randomness and intermittency of wind speed will cause large fluctuations in the output voltage, power and frequency of offshore wind power. Therefore, the large - scale grid connection of wind power will have an adverse impact on the stable operation of the existing power grid. As an inevitable choice for the development and utilization of deep - sea and far - sea wind power, the floating wind turbine will generate reciprocating pitching motion under the action of wind and waves due to the lack of support of a rigid foundation. Severe pitching motion will lead to oscillation effects at the tower top and blade tips, increase the fatigue load of components and reduce the service life of the floating wind turbine; the pitching motion will also reduce the aerodynamic load on the wind turbine and cause power oscillation, reducing the power generation efficiency of the floating wind turbine; in extreme sea conditions, excessive pitching motion will cause the platform to take in water or even capsize, seriously threatening the survival safety of the floating wind turbine.

[0003] For example, the invention with the application number 201910320617.4 discloses a control method and device for the yaw stability of a floating wind turbine, including a three - pontoon floating platform, a sensing and detection device, a data processing and control device, and a water level adjustment device. When the wind direction and wind force change, during the operation of the yaw system to turn the nacelle to face the wind, not only does the load size change, but also the direction of the moment formed by the thrust at the top of the tower barrel transmitted to the floating platform through the tower barrel changes at all times. When the floating platform tilts, it is necessary to dynamically adjust the ballast water and change the mass distribution of the ballast water of the floating platform to balance the tilting moment of the unit to ensure the stable operation state of the whole machine.

[0004] However, for a double - impeller floating wind turbine, since both impellers will bear the overturning action of the wind load, there is a greater possibility of power fluctuation and higher operation and maintenance costs compared with the above - mentioned single - impeller floating wind turbine. Therefore, it is necessary to design a pitch suppression system for a double - impeller floating wind turbine, which also has an energy storage function, to increase the power transmission stability of the double - impeller floating wind turbine and reduce the fatigue load at the nacelle and tower, thereby improving the power generation quality and reducing the operation and maintenance costs. Summary of the Invention

[0005] The present invention provides a pitch suppression and energy storage system and an operation method for a double - impeller floating wind turbine based on a rotating flywheel, which can significantly enhance the power transmission stability of the double - impeller floating wind turbine, effectively reduce the fatigue load borne by the nacelle and tower parts, not only can greatly improve the power generation quality of the wind turbine, but also can effectively reduce the operation and maintenance costs, providing a strong guarantee for the efficient and reliable operation of offshore wind power.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0007] A pitch suppression and energy storage system for a double - impeller floating wind turbine based on a rotating flywheel, including a double - impeller floating wind turbine foundation, which includes three foundation bodies arranged in a triangular shape; a flywheel energy storage and stabilization device is installed on two of the foundation bodies, and a floating wind turbine is installed on the top of the flywheel energy storage and stabilization device;

[0008] The flywheel energy storage and stabilization device includes a frame, a motor mover, a motor rotor, an electromagnet, a magnetic induction coil, a bearing, a rotating shaft, and a flywheel. The motor stator is fixed at the inner bottom of the frame. The motor rotor vertically penetrates from the bottom of the flywheel, and the center of the flywheel is sleeved on the motor shaft. A number of electromagnets are fixed on the top of the flywheel, and a magnetic induction coil is fixed in the frame above the electromagnets; the outer wall of the frame is symmetrically provided with rotating shafts, and bearings are sleeved outside the rotating shafts. The bearings are installed and embedded in the inner wall of the foundation body through supports;

[0009] The floating wind turbine is electrically connected to the motor through a transmission line;

[0010] When the double - impeller floating wind turbine foundation generates a pitching motion, the flywheels in the two flywheel energy storage and stabilization devices rotate in opposite directions;

[0011] Further, a limiter is installed on the rotating shaft, and the limiter is arranged coaxially with the bearing;

[0012] An inclination sensor is arranged on the double - impeller floating wind turbine foundation, and a motor controller is arranged on the motor. The inclination sensor, the double - impeller floating wind turbine foundation, and the motor controller are interconnected;

[0013] Further, on the double - impeller floating wind turbine foundation, each flywheel energy storage and stabilization device is also matched with a storage battery. The magnetic induction coil is electrically connected to the storage battery through a transmission line, and the storage battery is also electrically connected to an external booster station through a transmission line;

[0014] The operation method of the pitch suppression and energy storage system for the double - impeller floating wind turbine based on the rotating flywheel: The rotation of the impeller of the floating wind turbine generates electric energy, and the electric energy is transmitted to the motor of the flywheel energy storage and stabilization device. The motor starts to drive the flywheel to rotate, and the rotational speed gradually increases; the inclination sensor monitors the pitching angle of the double - impeller floating wind turbine foundation and transmits the pitching angle data to the motor controller. The motor controller calculates the rated rotational speed corresponding to the pitching response in a set period;

[0015] Furthermore, the flywheels in the two flywheel energy storage and stabilization devices rotate in opposite directions. The rotation of the flywheel generates angular momentum, which has the same direction as the rotation direction of the flywheel. When the double-impeller floating wind turbine foundation undergoes pitching motion, the angular momentum of the flywheel is subjected to an external torque, and the frames of the flywheel energy storage and stabilization devices precess around the rotating shaft, and the precession directions of the two frames are opposite. The opposite precessions cancel out the disturbing torques generated in the roll and yaw directions, and at the same time generate a roll damping torque opposite to the pitching motion direction, suppressing the pitching motion of the double-impeller floating wind turbine foundation.

[0016] Furthermore, under the precession action of the flywheel, the frame drives the flywheel to rotate parallel to the roll axis around the bearing, and at the same time generates a roll damping torque. It is set that the component of the roll damping torque generated by a single flywheel in the roll direction is The component in the yaw direction is The component in the pitching direction is where I is the moment of inertia of the flywheel relative to the pitching axis, I zg is the moment of inertia of the flywheel around the motor axis, is the pitching angular velocity of the double-impeller floating wind turbine foundation, w0 is the angular velocity of the flywheel rotating around the motor axis, β is the precession angle of the frame around the rotating shaft, is the precession angular velocity of the frame around the rotating shaft, is the precession angular acceleration of the frame around the rotating shaft;

[0017] When the two flywheels rotate in opposite directions, then M 横摇 = M 船摇 = 0,

[0018] Furthermore, when the rotational speed of the flywheel ≥ the preset rated rotational speed, the electromagnet is energized, and at the same time, it rotates relative to the magnetic induction coil. The magnetic induction coil cuts the magnetic induction line to generate electric energy. The electric energy is supplied to the storage battery through the transmission line. After the storage battery reaches the storage upper limit, it supplies power to the external booster station.

[0019] Furthermore, if the floating wind turbine is in a shutdown state and the impeller does not generate electric energy, the storage battery supplies power to the motor to maintain the rated rotational speed of the flywheel, and the flywheel continues to generate an external torque to resist pitching.

[0020] Through the above technical solutions, compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The pitching suppression and energy storage system for a double-impeller floating wind turbine based on a rotating flywheel provided by the present invention stores the unstable electric energy generated by the double-impeller floating wind turbine through the provided flywheel energy storage and stabilization device. At the same time, the flywheel energy storage and stabilization device has the advantages of long service life, high energy storage density, not being limited by the number of charge and discharge cycles, and being convenient for installation and maintenance;

[0022] 2. The operation method of the pitching suppression and energy storage system of the dual-impeller floating wind turbine based on a rotating flywheel provided by the present invention. According to the law of conservation of angular momentum, compared with directly fixing the flywheel and the motor on the foundation body, fixing the flywheel in the form of bearings and a frame enables the flywheel to precess freely around the bearings, effectively generating a roll-reducing moment to suppress pitching.

[0023] 3. The operation method of the pitching suppression and energy storage system of the dual-impeller floating wind turbine based on a rotating flywheel provided by the present invention. By restricting the precession angle of the frame, the component of the roll-reducing moment in the yaw degree of freedom can be effectively reduced. Moreover, the reverse rotation and precession of the two flywheels will make the components of the roll-reducing moment in the yaw degree of freedom have opposite directions and cancel each other out, while the components in the pitching degree of freedom have the same direction and are superimposed on each other, thereby increasing the roll-reducing effect of the dual-flywheel energy storage device in the pitching degree of freedom and reducing the interference with the movement of the other degrees of freedom.

[0024] 4. The operation method of the pitching suppression and energy storage system of the dual-impeller floating wind turbine based on a rotating flywheel provided by the present invention. In extreme weather conditions, when the floating wind turbine is in a shutdown state and stops supplying energy to the flywheel, supplying energy to the flywheel through the battery can maintain the rotational speed of the flywheel and continuously generate a roll-reducing moment to resist the large pitching in extreme weather conditions and increase the stability of the floating wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the drawings and embodiments.

[0026] Figure 1 is the overall structural schematic diagram of the preferred embodiment provided by the present invention;

[0027] Figure 2 is the overall structural schematic diagram of the flywheel energy storage and stabilization device of the preferred embodiment provided by the present invention;

[0028] Figure 3 is the cross-sectional view of the flywheel energy storage and stabilization device of the preferred embodiment provided by the present invention;

[0029] Figure 4 is the schematic diagram of the force analysis of the foundation of the dual-impeller floating wind turbine of the preferred embodiment provided by the present invention;

[0030] Figure 5 is the force analysis diagram of the flywheel energy storage and stabilization device for suppressing pitching of the preferred embodiment provided by the present invention.

[0031] In the figure: 1 is a double-impeller floating wind turbine foundation, 2 is a flywheel energy storage stabilization device, 3 is a floating wind turbine, 4 is a storage battery, 5 is an inclination sensor, 6 is a frame, 7 is a motor mover, 8 is a motor rotor, 9 is an electromagnet, 10 is a magnetic induction coil, 11 is a bearing, 12 is a rotating shaft, 13 is a flywheel, 14 is a stopper, 15 is a transmission line, 16 is a motor shaft, and 17 is a foundation body. Detailed implementation manners

[0032] Now, the present invention will be further described in detail with reference to the accompanying drawings. In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "left side", "right side", "upper part", "lower part", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second", etc. do not represent the importance of components, so they cannot be understood as limitations to the present invention. The specific dimensions adopted in this embodiment are only for illustrating the technical solution by way of example, and do not limit the protection scope of the present invention.

[0033] As described in the background art, at present, there are few stability maintenance designs for double-impeller floating wind turbines, and it is impossible to take into account both the power transmission stability of the system and the anti-fatigue performance of the nacelle or tower. Therefore, the present application provides a pitching suppression and energy storage system for a double-impeller floating wind turbine based on a rotating flywheel, which can effectively suppress pitching and at the same time provide an efficient energy storage function, greatly improving the stability of the system.

[0034] As Figure 1 shown is a schematic diagram of the overall structure of the preferred embodiment provided by the present application, including a double-impeller floating wind turbine foundation 1, which includes three foundation bodies 17 arranged in a triangular shape; a flywheel energy storage stabilization device 2 is installed on two of the foundation bodies, and a floating wind turbine 3 is installed on the top of the flywheel energy storage stabilization device.

[0035] As the biggest innovation point of the present application, it is the described flywheel energy storage stabilization device. Figures 2 - 3 is a schematic diagram of its structure, including a frame 6, a motor mover 7, a motor rotor 8, an electromagnet 9, a magnetic induction coil 10, a bearing 11, a rotating shaft 12, and a flywheel 13. The motor stator is fixed at the inner bottom of the frame. The motor rotor vertically penetrates from the bottom of the flywheel, and the center of the flywheel is sleeved on the motor shaft 16. A plurality of electromagnets are fixed on the top of the flywheel, and a magnetic induction coil is fixed in the frame at the top of the electromagnet; the outer wall of the frame is symmetrically provided with rotating shafts, and bearings are sleeved outside the rotating shafts. The bearings are installed and embedded in the inner wall of the foundation body through supports, and the floating wind turbine is electrically connected to the motor through a transmission line 15.

[0036] The setting of the flywheel energy storage stabilization device has two functions. First, it is for stabilization (pitching suppression). Figure 4The force analysis of the double - impeller floating wind turbine foundation is presented, mainly including rolling, pitching and yawing. Under the action of wind and wave loads, the double - impeller floating wind turbine foundation sways in the pitching degree of freedom. The flywheel and the frame will also pitch with the double - impeller floating wind turbine foundation. According to the principle of conservation of angular momentum, the flywheel will rotate with the frame in the rolling degree of freedom. This phenomenon is called precession. When the flywheels in the two flywheel energy storage stabilizers rotate in opposite directions, the rotation of the flywheels generates angular momentum, and the direction is the same as the rotation direction of the flywheels. When the double - impeller floating wind turbine foundation generates pitching motion, the angular momentum of the flywheel is affected by the external torque, and the frame of the flywheel energy storage stabilizer generates precession around the rotating shaft, and the precession directions of the two frames are opposite. The opposite precessions cancel the interference torques generated in the rolling and yawing directions, and at the same time generate a anti - pitching torque opposite to the pitching motion direction, suppressing the pitching motion of the double - impeller floating wind turbine foundation.

[0037] Specifically, the installation direction of the rotating shaft is the same as the rolling axis direction of the double - impeller floating wind turbine foundation. Therefore, under the action of precession, the frame drives the flywheel to rotate parallel to the rolling axis around the bearing, and at the same time generates an anti - pitching torque. Figure 5 As shown in the figure, it is set that the component of the anti - pitching torque generated by a single flywheel in the rolling direction is The component in the yawing direction is The component in the pitching direction is Among them, I is the moment of inertia of the flywheel relative to the pitching axis, I zg is the moment of inertia of the flywheel around the motor shaft, is the pitching angular velocity of the double - impeller floating wind turbine foundation, w0 is the angular velocity of the flywheel rotating around the motor shaft, β is the precession angle of the frame around the rotating shaft, is the precession angular velocity of the frame around the rotating shaft, is the precession angular acceleration of the frame around the rotating shaft.

[0038] Since the flywheels in the two flywheel energy storage stabilizers rotate in opposite directions, according to the law of conservation of angular momentum, the two frames will generate precession rotations with the same magnitude but opposite directions around the transverse axis, so that the projection M of the resultant anti - pitching torque generated in the rolling and yawing directions 横摇 = M 船摇 = 0, and the projection on the pitching axis Finally, the effect of suppressing the pitching motion is achieved.

[0039] Obviously, the two flywheels with different rotation directions work together to better cope with complex wind and wave conditions. Under the action of external forces in different directions, the two flywheels can respectively generate appropriate torques to suppress the pitching of the wind turbine from different directions, improving the reliability and comprehensiveness of the suppression effect.

[0040] When the flywheel precesses, a roll damping moment will be generated. However, as the precession angle increases, the component of this roll damping moment in the yaw degree of freedom will gradually increase, bringing unnecessary yaw response to the floating wind turbine. Therefore, a limiter 14 is installed on the rotating shaft. The limiter is arranged coaxially with the bearing. By restricting the precession angle of the frame, the component of the roll damping moment in the yaw degree of freedom can be effectively reduced, enabling the device to adapt to the complex sea wind and wave environment. When the floating wind turbine undergoes rolling and other motions, it can still operate stably and continuously play the role of energy storage and pitch suppression.

[0041] At the same time, in order to accurately implement real-time adjustment, an inclination sensor 5 is set on the basis of the double-impeller floating wind turbine, and a motor controller is set on the motor. The inclination sensor, the double-impeller floating wind turbine base, and the motor controller are interconnected. The inclination sensor continuously monitors the inclination data of the double-impeller floating wind turbine base and transmits it to the motor controller. The motor controller calculates the rated speed corresponding to the pitch response during this period and adjusts the motor speed in real time according to these data, thereby controlling the rotation state of the flywheel. When the wind turbine shows a pitch trend, by changing the speed and direction of the flywheel, a moment opposite to the pitch direction is generated, effectively suppressing the occurrence of pitch and reducing the fatigue load borne by the nacelle and tower due to pitch.

[0042] The second function of the flywheel energy storage and stabilization device is energy storage. On the basis of the double-impeller floating wind turbine, each flywheel energy storage and stabilization device is also equipped with a storage battery 4. The magnetic induction coil is electrically connected to the storage battery through a power transmission line 15. The storage battery is also electrically connected to an external booster station through the power transmission line 15. Under the action of wind and wave loads, the impellers of the double-impeller floating wind turbine rotate to generate intermittent and unstable electric energy. This electric energy is transmitted to the motor in the flywheel energy storage and stabilization device. The bottom of the stator of the motor is connected to the bottom of the frame, and the motor rotor drives the flywheel to rotate, and the speed gradually increases; the speeds of the motor rotor and the flywheel continue to increase. When the speed of the flywheel ≥ the preset rated speed, the electromagnet is energized, and at the same time, relative rotation occurs with the magnetic induction coil, and the magnetic induction coil cuts the magnetic induction line to generate electric energy; the generated electric energy is first supplied to the storage battery, and if the storage battery reaches the storage capacity limit, it is then supplied to the external booster station. By storing the excess electric energy generated by the wind turbine impellers, when the power generation of the floating wind turbine is unstable or the external demand changes, the flywheel energy storage and stabilization device can release energy in a timely manner, maintain the stability of power transmission, reduce the voltage and frequency changes caused by power generation fluctuations, improve the power quality, and provide a stable and reliable power supply for the power grid.

[0043] Regarding the arrangement method of the electromagnets here, preferably as Figures 2 - 3 shown, a number of electromagnets are dispersed and arranged in a circular shape with the center of the flywheel as the center at the top of the flywheel.

[0044] When the actual wind speed is greater than the cut-out wind speed, the floating wind turbine is in a shutdown state, and the power supply to the motor is stopped. At this time, the battery starts to supply power to the motor to maintain the rated speed of the flywheel. The flywheel continues to generate a moment to resist pitching with the pitching motion of the foundation of the double-impeller floating wind turbine, reducing the risk of overturning of the floating wind turbine under extreme weather conditions.

[0045] The flywheel in the flywheel energy storage stabilization device provided by this application itself has a high energy density, can store a large amount of energy in a small space, stores energy through high-speed rotation, and can meet the energy storage requirements of the double-impeller floating wind turbine under different working conditions, providing sufficient energy reserves for maintaining the stability of power transmission. Secondly, the structure is mainly composed of mechanical components. Compared with the battery energy storage system that is vulnerable to the number of charge and discharge cycles, the flywheel energy storage stabilization device has a longer service life. As long as the normal maintenance of the mechanical components is ensured, its operating time far exceeds that of chemical batteries, greatly reducing the frequency of replacing energy storage devices and reducing the operation and maintenance costs.

[0046] Those skilled in the art of this technology can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used here have the same meaning as the general understanding of those of ordinary skill in the art to which this application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless defined as here.

[0047] The meaning of "and / or" described in this application refers to the situation where each exists alone or both exist simultaneously.

[0048] The meaning of "connection" described in this application can be a direct connection between components or an indirect connection between components through other components.

[0049] Taking the above ideal embodiments of the present invention as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A pitching suppression and energy storage system for a double - impeller floating wind turbine based on a rotating flywheel, characterized in that: It includes a double - impeller floating wind turbine foundation, which includes three foundation bodies arranged in a triangular shape; a flywheel energy storage and stabilization device is installed on two of the foundation bodies, and a floating wind turbine is installed on the top of the flywheel energy storage and stabilization device; The flywheel energy storage and stabilization device includes a frame, a motor stator, a motor rotor, an electromagnet, a magnetic induction coil, a bearing, a rotating shaft and a flywheel. The motor stator is fixed at the inner bottom of the frame. The motor rotor vertically penetrates from the bottom of the flywheel, and the center of the flywheel is sleeved on the motor shaft. A number of electromagnets are fixed on the top of the flywheel, and the magnetic induction coil is fixed in the frame at the top of the electromagnet; The outer wall of the frame is symmetrically provided with rotating shafts, and bearings are sleeved outside the rotating shafts. The bearings are installed and embedded in the inner wall of the foundation body through supports; The floating wind turbine is electrically connected to the motor through a transmission line; When the double - impeller floating wind turbine foundation generates a pitching motion, the flywheels in the two flywheel energy storage and stabilization devices rotate in opposite directions.

2. The double-impeller floating wind turbine pitch suppression and energy storage system based on a rotating flywheel according to claim 1, wherein: A limiter is installed on the rotating shaft, and the limiter is arranged coaxially with the bearing; An inclination sensor is arranged on the double - impeller floating wind turbine foundation, and a motor controller is arranged on the motor. The inclination sensor, the double - impeller floating wind turbine foundation and the motor controller are interconnected.

3. The pitch suppression and energy storage system for a dual-impeller floating wind turbine based on a rotating flywheel according to claim 1, characterized in that: On the double - impeller floating wind turbine foundation, each flywheel energy storage and stabilization device is also matched with a storage battery. The magnetic induction coil is electrically connected to the storage battery through a transmission line, and the storage battery is also electrically connected to an external booster station through a transmission line.

4. The operation method of the pitching suppression and energy storage system of the double-impeller floating wind turbine based on a rotating flywheel according to any one of claims 1-3, characterized in that: The rotation of the impeller of the floating wind turbine generates electric energy. The electric energy is transmitted to the motor of the flywheel energy storage and stabilization device. The motor starts to drive the flywheel to rotate, and the rotation speed gradually increases; The inclination sensor monitors the pitching angle of the double - impeller floating wind turbine foundation and transmits the pitching angle data to the motor controller. The motor controller calculates the rated rotation speed corresponding to the pitching response in a set period.

5. The operating method of the pitching suppression and energy storage system for a double-impeller floating wind turbine based on a rotating flywheel according to claim 4, characterized in that: The flywheels in the two flywheel energy storage and stabilization devices rotate in opposite directions. The rotation of the flywheels generates angular momentum, and the direction is the same as the rotation direction of the flywheels; When the double - impeller floating wind turbine foundation generates a pitching motion, the angular momentum of the flywheels is affected by an external torque, and the frame of the flywheel energy storage and stabilization device precesses around the rotating shaft, and the precession directions of the two frames are opposite; The opposite precessions cancel the interference torques generated in the roll and yaw directions, and at the same time generate a roll - reducing torque opposite to the pitching motion direction, suppressing the pitching motion of the double - impeller floating wind turbine foundation.

6. The operation method of the pitching suppression and energy storage system for a double-impeller floating wind turbine based on a rotating flywheel according to claim 5, characterized in that: Under the precession of the flywheel, the frame drives the flywheel to rotate around the bearing parallel to the roll axis, and at the same time generates a roll damping moment. The component of the roll damping moment generated by a single flywheel in the roll direction is The component in the yaw direction is The component in the pitch direction is where I is the moment of inertia of the flywheel relative to the pitch axis, I zg is the moment of inertia of the flywheel about the motor axis, is the pitch angular velocity of the floating foundation of the dual-impeller wind turbine, w0 is the angular velocity of the flywheel rotating about the motor axis, β is the precession angle of the frame about the rotating shaft, is the precession angular velocity of the frame about the rotating shaft, is the precession angular acceleration of the frame about the rotating shaft; When the two flywheels rotate in opposite directions, then M 横摇 = M 艏摇 = 0, 7. The operation method of the pitching suppression and energy storage system for a double - impeller floating wind turbine based on a rotating flywheel according to claim 4, characterized in that: When the rotation speed of the flywheel ≥ the preset rated rotation speed, the electromagnet is powered on, and at the same time, a relative rotation is generated with the magnetic induction coil. The magnetic induction coil cuts the magnetic induction line to generate electric energy; The electric energy is supplied to the storage battery through a transmission line. After the storage battery reaches the storage upper limit, it supplies power to the external booster station.

8. The operating method of the pitching suppression and energy storage system of the double impeller floating wind turbine based on a rotating flywheel according to claim 7, characterized in that: If the floating wind turbine is in a shutdown state and the impeller does not generate electric energy, the storage battery supplies power to the motor to maintain the rated rotation speed of the flywheel, and the flywheel continues to generate an external torque to resist pitching.

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