CN217950585U - Blade-free high-power double-fed wind generating set - Google Patents

Abstract

The utility model relates to a no blade high-power double-fed type wind generating set belongs to the wind-powered electricity generation field. The wind turbine generator set comprises a wind turbine, a magnetic gear box, a double-fed wind driven generator, a converter system of the double-fed wind driven generator and the like; the wind turbine comprises an airflow speed increaser, an air guide part, a working part, an exhaust pipe and a yawing part; the magnetic gear box comprises a low-speed level magnetic gear, a medium-speed level magnetic gear, a high-speed level magnetic gear, an input shaft, an output shaft and the like, wherein the magnetic gear is a coaxial magnetic gear; the converter system of the double-fed wind driven generator comprises a grid-side converter, a rotor-side converter, a bidirectional direct-current converter and energy storage equipment. The utility model discloses need not the blade, need not the lubrication, need not to untie the cable, the simple installation, but greatly reduced transportation, installation, fortune dimension cost realize wind turbine generator system lightweight, miniaturization, low cost, high benefit, have eliminated super large power wind turbine generator system's development bottleneck.

Description

Blade-free high-power double-fed wind generating set

Technical Field

The utility model relates to a wind generating set, especially a no blade high-power double-fed type wind generating set belongs to wind power generation technical field.

Background

At present, the high-power horizontal axis wind turbine generator set needs blades to capture wind energy to convert the wind energy into mechanical energy; the double-fed wind turbine generator set also needs a wind power gear box to realize speed increase, and the lower rotating speed of a wind wheel is increased to the higher rotating speed of a double-fed generator rotor. The two factors cause the existing wind turbine generator set to have the following inherent defects:

firstly, taking a horizontal axis wind turbine as an example, each fan generally adopts 3 blades, each blade is long and heavy, and is tens of meters to hundreds of meters long, and is tons to tens of tons heavy, so that the transportation is difficult and the installation is inconvenient, especially for the super-high power wind turbine, the blades are longer and heavier, the transportation, installation, operation and maintenance are difficult, the cost is high, and the development of the wind turbine to super-high power is seriously restricted.

Secondly, between the cut-in wind speed and the rated wind speed, in order to realize Maximum Power Point Tracking (MPPT), the rotating speed of the wind wheel must be adjusted according to the wind speed, so that the wind wheel works at the optimal working point, the control is complex, and meanwhile, a rotating part of the wind turbine bears high mechanical stress in the process of realizing the MPPT, so that the service life of the rotating part is shortened.

Thirdly, the double-fed wind power generator is a high-speed motor, and a gear box is required to realize speed increase. The existing wind power gear box is of a mechanical meshing type, a complex and heavy lubricating, oil injecting and cooling system is needed, the fault rate is high, the operation and maintenance cost is high, the healthy development of the double-fed wind power generator set is severely restricted, and the development of the double-fed wind power generator set particularly towards higher power is realized.

Disclosure of Invention

The utility model discloses a main aim at: the utility model provides a not enough and blank to prior art, the utility model provides a need not the blade, need not complicated oiling lubrication and cooling system, need not to carry out maximum power point and trails, need not the high-power double-fed type wind generating set of untwisting cable, therefore can realize wind turbine generator system lightweight, miniaturization, low cost, high efficiency, improve system operation performance and reliability.

In order to achieve the above object, the utility model relates to a high-power double-fed type wind generating set of no blade, include: the wind power generation system comprises a wind turbine, a magnetic gear box, a double-fed wind driven generator, a converter system of the double-fed wind driven generator and a tower.

The wind turbine comprises: the device comprises an airflow speed increaser, an air guide part, a working part, an exhaust pipe and a yawing part.

The air flow speed increaser is a horn-shaped pipeline, a large port of the air flow speed increaser is an air entraining port, air is blown in from the large port, and a small port of the air flow speed increaser is fixed with the air guide part.

The air guide part comprises an air guide circular tube, an air guide mechanism and a nozzle; the air guide mechanism comprises a guide vane and a rotating shaft mechanism, and the rotating shaft mechanism is used for adjusting the guide angle of the guide vane so as to change the size of the air flow; the guide vane, the rotating shaft mechanism and the nozzle are installed in the air guide circular tube, and the inlet end of the air guide circular tube is fixed with the small port of the airflow speed increaser.

The working parts comprise a rotating wheel, a main shaft bearing and a working circular pipe; the rotating wheel is arranged in the middle of the working circular tube; the main shaft is fixed with the rotating wheel, and the other end of the main shaft is fixed with a rotating shaft of the double-fed wind driven generator through a generator coupler; the main shaft bearing is sleeved on the outer side of the main shaft, is arranged at the joint of the working circular tube and the tower frame and bears the gravity and the radial thrust of the rotating wheel; the rotating wheel, the main shaft bearing, the generator coupler and the rotating shaft of the double-fed wind driven generator are all concentric; one end of the working circular tube is fixed with the air guide circular tube, and the other end of the working circular tube is fixed with the exhaust pipe.

The exhaust pipe is an open horn-shaped exhaust pipeline, a small port of the exhaust pipe is fixed with a working circular pipe of the working component, and a large port of the exhaust pipe is an exhaust port;

the yaw assembly includes: a tail vane and a yaw bearing; the tail vane is fixedly arranged at the rear end of the exhaust pipe, the yaw bearing is arranged at the joint of the working circular pipe and the tower frame, the outer ring of the yaw bearing is fixed with the tower frame, and the inner ring of the yaw bearing is sleeved outside the main shaft bearing and is fixed with the working circular pipe.

Further, to increase the airflow power and facilitate braking, the wind turbine may be equipped with a booster brake comprising two ducts: a first conduit and a second conduit; one end of the first pipeline is fixedly arranged in front of the outer part of the exhaust pipe, and the other end of the first pipeline is fixedly arranged in front of the outer part of the circular air guide pipe; one end of the second pipeline is fixedly arranged behind the outer part of the exhaust pipe, and the other end of the second pipeline is fixedly arranged behind the outer part of the airflow speed increaser.

Further, for a wind turbine with higher power, the yaw component can adopt a yaw system, and the yaw system comprises a large yaw gear ring, a lateral bearing, a yaw driving device and a yaw brake; the yaw large gear ring is fixed with the tower through bolts; the yaw driving device comprises a yaw motor, a speed reducer of the yaw motor and a pinion, the pinion is meshed with a yaw large gear ring, and the yaw driving device is fastened on a working circular pipe of the working component through a bolt. When the wind direction changes, the yaw driving device drives the working circular tube to rotate, and yaw wind alignment is achieved. The yaw system is a simplified version of the yaw system of the existing horizontal-axis wind turbine generator, and a double-fed wind turbine generator is vertically arranged in a tower frame, so that a yaw counter and a cable twisting protection device are not needed.

The magnetic gear box consists of three stages of magnetic gears, namely a low-speed stage magnetic gear, a medium-speed stage magnetic gear and a high-speed stage magnetic gear, an input shaft and an output shaft; the low-speed level magnetic gear, the medium-speed level magnetic gear and the high-speed level magnetic gear are all coaxial magnetic gears, and the coaxial magnetic gears comprise: outer rotor, inner rotor, accent magnetic ring and casing.

The input shaft of the magnetic gearbox is connected with the main shaft of the wind turbine through a coupler; and an output shaft of the magnetic gear box is fixed with a rotating shaft of the doubly-fed wind driven generator through a generator coupler.

The double-fed wind driven generator and the converter system thereof comprise: a double-fed wind driven generator and a converter system; the double-fed wind driven generator comprises a three-phase alternating current stator and a rotor, wherein the three-phase alternating current stator is connected with a power grid through a boosting transformer; the converter system comprises a rotor side converter, a network side converter, a bidirectional direct current converter and energy storage equipment. The rotor side converter is used for regulating and controlling the rotor exciting current and the rotating speed of the doubly-fed wind power generator, so that the stator voltage of the doubly-fed wind power generator is controlled to have the same amplitude, the same phase and the same frequency with the grid voltage, and grid connection is realized; the grid-side converter is a bidirectional converter, the alternating current side of the grid-side converter is connected with the stator of the doubly-fed wind driven generator, one end of the direct current side of the grid-side converter is connected with the direct current side of the rotor-side converter, and the other end of the direct current side of the grid-side converter is connected with the bidirectional direct current converter; the alternating current side of the rotor side converter is connected with the rotor of the doubly-fed wind generator; and the other end of the bidirectional direct current converter is connected with the energy storage equipment.

The beneficial effects of the utility model are that:

1) Because long and heavy blades are not needed, the transportation, installation and complete machine manufacturing cost can be greatly reduced, and the aims of light weight, miniaturization and low cost of the wind turbine generator are really fulfilled;

2) The wind energy capture device has the advantages that a mechanism completely different from the existing wind energy capture is adopted, the wind speed is increased through the airflow speed increasing device, the wind energy capture efficiency is greatly improved, the efficiency can reach more than 90%, and is far beyond the Betz limit 59.3% of the wind energy utilization coefficient of the traditional wind turbine, so that the volume of the wind turbine is greatly reduced, and the development bottleneck of the wind turbine with super-high power is eliminated;

3) Because the wind driven generator is vertically arranged in the tower, the cable is not required to be untied, the control is simpler and more convenient, and the generating efficiency is higher.

4) Maximum power point tracking is not needed, control is simple and convenient, operation is flexible, and service life is longer.

5) The magnetic gear box is adopted to replace a mechanical meshing type wind power gear box, a complex and heavy oil injection cooling system is not needed, the operation and maintenance cost of the gear box can be greatly reduced, and the economic benefit of a wind power plant is improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the booster brake of the present invention.

Fig. 3 is a schematic structural diagram of the pressurizing brake and the yawing system according to the present invention.

Fig. 4 is a schematic structural view of the magnetic gear box of the present invention.

Fig. 5 is a schematic view of the coaxial magnetic gear structure of the magnetic gear box of the present invention.

Fig. 6 is a topological structure diagram of the wind power generation system according to the present invention.

Wherein, 1-airflow speed increaser; 2-an air guide part, 21-an air guide circular tube, 22-an air guide mechanism, 221-a guide vane, 222-a rotating shaft mechanism and 23-a nozzle; 3-working part, 31-rotating wheel, 32-main shaft, 33-main shaft bearing and 34-working circular tube; 4, exhausting the pipe; 5-yaw component, 51-tail rudder, 52-yaw bearing, 53-yaw system; 6-booster brake, 61-first pipe, 62-second pipe; 7-a tower; 8-magnetic gear box, 80-input shaft, 81-low speed stage coaxial magnetic gear, 82-medium speed stage coaxial magnetic gear, 83-high speed stage coaxial magnetic gear, 84-first coupler, 85-second coupler, 86-output shaft, 811-outer rotor, 812-inner rotor, 813-magnetic regulation ring, 815-outer shell; 9-a generator coupling; 10-doubly-fed wind generator, 101-doubly-fed wind generator stator, 102-doubly-fed wind generator rotor; 11-double-fed wind generator converter system; 111-grid-side converter, 112-rotor-side converter, 113-bidirectional dc converter, 116-energy storage device; 12-a generator platform; 16-coupler

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, the utility model relates to a no blade high-power double-fed type wind generating set, include: the double-fed wind power generator comprises a wind turbine, a magnetic gear box 8, a double-fed wind power generator 10, a converter system 11 of the double-fed wind power generator, a tower 7 and a generator platform 12, wherein the double-fed wind power generator 10 is installed on the generator platform 12.

As shown in FIG. 1, a wind turbine includes: the air flow speed increaser comprises an air flow speed increaser 1, an air guide part 2, a working part 3, an exhaust pipe 4 and a yawing part 5.

The airflow speed increaser 1 is a horn-shaped pipeline, a large port of the airflow speed increaser is an air-entraining port, air is blown in from the large port, and a small port of the airflow speed increaser is fixed with the air guide part 2.

The air guide part 2 comprises an air guide circular tube 21, an air guide mechanism 22 and a nozzle 23; the air guide mechanism 22 comprises a guide vane 221 and a rotating shaft mechanism 222, wherein the rotating shaft mechanism 222 is used for adjusting the guide angle of the guide vane 221 so as to change the size of the air flow; the guide vane 221, the rotating shaft mechanism 222 and the nozzle 23 are installed in the air guide circular tube 21, and the inlet end of the air guide circular tube 21 is fixed with the small port of the airflow speed increaser 1.

The working process of the air guide mechanism 22 is as follows: when the wind speed is between the cut-in wind speed and the rated wind speed, the rotating shaft mechanism 222 adjusts the guide vane 221 to have a guide angle of zero. When the wind speed is higher than the rated wind speed, the rotating shaft mechanism 222 adjusts the guide angle of the guide vane 221 to gradually increase to a proper value, so that the captured wind power is constantly equal to the rated power value; when the wind speed exceeds the cut-out wind speed, the rotating shaft mechanism 222 is made to adjust the guide vane 221 until it is closed, blocking the flow of air into the working part 3.

The working component 3 comprises a rotating wheel 31, a main shaft 32, a main shaft bearing 33 and a working circular tube 34; the rotating wheel 31 is arranged in the middle of the working circular tube 34; the main shaft 32 is fixed with the rotating wheel 31, and the other end of the main shaft 32 is fixed with a rotating shaft of the doubly-fed wind driven generator 10 through the generator coupler 9; the main shaft bearing 33 is sleeved outside the main shaft 32, is arranged at the joint of the working circular tube 34 and the tower 7, and bears the gravity and the radial thrust of the rotating wheel 31; the rotating shafts of the rotating wheel 31, the main shaft 32, the main shaft bearing 33, the generator coupling 9 and the doubly-fed wind generator 10 are all kept concentric; one end of the working circular tube 34 is fixed to the air guiding circular tube 21, and the other end is fixed to the exhaust pipe 4.

The exhaust pipe 4 is an open horn-shaped exhaust pipeline, a small port of the exhaust pipe is fixed with the working circular pipe 34 of the working component 3, and a large port of the exhaust pipe is an exhaust port;

the yaw member 5 includes: a tail rudder 51, a yaw bearing 52; the tail rudder 51 is fixed at the rear end of the exhaust pipe 4, the yaw bearing 52 is arranged at the joint of the working circular pipe 34 and the tower 7, the outer ring of the yaw bearing is fixed with the tower 7, and the inner ring of the yaw bearing is sleeved outside the main shaft bearing 33 and is fixed with the working circular pipe 34.

As shown in fig. 2, in order to increase the air flow power and facilitate braking, the wind turbine may be additionally equipped with a booster brake 6, the booster brake 6 comprising two pipes: a first pipe 61 and a second pipe 62; one end of the first pipe 61 is fixedly arranged in front of the outer part of the exhaust pipe 4, and the other end of the first pipe is fixedly arranged in front of the outer part of the circular air guide pipe 21; one end of the second pipe 62 is fixed to the rear of the outside of the exhaust pipe 4, and the other end is fixed to the rear of the outside of the airflow speed increasing gear 1.

In normal operation, namely when the wind speed is between the cut-in wind speed and the cut-out wind speed, the booster brake 6 leads the airflow discharged from the runner 31 to the airflow speed increaser 1 through the first pipeline 61 and the second pipeline 62 to play a role of boosting; when the runner 31 needs to be braked rapidly, the rotating shaft mechanism 222 of the air guide part 2 controls the guide vane 221 to block the air flow from flowing in, and the air flow flows through the second pipeline 62 of the booster brake 6 to jet the runner 31 in the opposite direction, so that the runner 31 is stopped rapidly.

As shown in fig. 3, for a larger power wind turbine, the yaw component may adopt a yaw system 53, which includes a large yaw gear ring, a side bearing, a yaw driving device, and a yaw brake; the yaw large gear ring is fixed with the tower 7 by bolts; the yaw driving device comprises a yaw motor, a speed reducer of the yaw motor and a small gear, wherein the small gear is meshed with a large yaw gear ring, and the yaw driving device is fastened on a working circular pipe 34 of the working component 3 through a bolt. When the wind direction changes, the yaw driving device drives the working circular pipe 34, so as to drive the whole wind turbine to rotate, and yaw wind alignment is realized. Yaw system 53 is the simplified version of current horizontal axis wind turbine generator system yaw system, the utility model discloses because doubly-fed type aerogenerator 10 installs perpendicularly in pylon 7, need not to untie the cable, so need not the counter of yawing and turns round cable protection device.

As shown in fig. 4, the magnetic gear box 8 realizes a speed-up function, and is composed of three-stage magnetic gears, i.e., a low-speed-stage magnetic gear 81, a medium-speed-stage magnetic gear 82, and a high-speed-stage magnetic gear 83, an input shaft 80, and an output shaft 86, wherein the low-speed-stage magnetic gear 81 is connected to the medium-speed-stage magnetic gear 82 through a first coupling 84, and the medium-speed-stage magnetic gear 82 is connected to the high-speed-stage magnetic gear 83 through a second coupling 85.

The low-speed stage magnetic gear 81, the medium-speed stage magnetic gear 82, and the high-speed stage magnetic gear 83 are all coaxial magnetic gears. Taking the low-speed stage magnetic gear 81 as an example, as shown in fig. 5, the low-speed stage magnetic gear 81 includes: an outer rotor 811, an inner rotor 812, a magnetic adjusting ring 813, and a casing 815.

As shown in fig. 1 to 4, an input shaft 80 of the magnetic gear box 8 is connected to the main shaft 32 of the wind turbine via the coupling 16, and an output shaft 86 thereof is fixed to a rotating shaft of the doubly-fed wind turbine 10 via the generator coupling 9.

As shown in fig. 6, the doubly-fed wind turbine 10 includes a three-phase ac stator 101 and a rotor 102, wherein the three-phase ac stator 101 is connected to a grid through a step-up transformer; the doubly fed wind generator converter system 11 comprises a grid-side converter 111, a rotor-side converter 112, a bidirectional dc converter 113 and an energy storage device 116. The rotor-side converter 112 is used for regulating and controlling the rotor exciting current and the rotating speed of the doubly-fed wind power generator 10, so as to control the stator voltage of the doubly-fed wind power generator 10, so that the stator voltage has the same amplitude, the same phase and the same frequency as the grid voltage, and grid connection is realized; the grid-side converter 111 is a bidirectional converter, the alternating current side of the bidirectional converter is connected with the stator 101 of the doubly-fed wind driven generator, one end of the direct current side of the bidirectional converter is connected with the direct current side of the rotor-side converter 112, and the other end of the bidirectional converter is connected with the bidirectional direct current converter 113; the alternating current side of the rotor-side converter 112 is connected with the rotor 102 of the doubly-fed wind generator; the other end of the bidirectional dc converter 113 is connected to an energy storage device 116. When the unit is excited, the energy storage device 116 boosts the voltage through the bidirectional dc converter 113, and provides an excitation current to the rotor 102 of the doubly-fed wind generator through the rotor-side converter 112; during the unit constant power output period, the redundant power charges the energy storage device 116 through the grid-side converter 111 and the bidirectional direct current converter 113 to store energy; during the grid voltage sag, the dc-side voltage of the grid-side converter 111 rises, and at this time, the bidirectional dc converter 113 is controlled to charge the energy storage device 116, store energy, and implement low voltage ride through.

Therefore, it is visible, the utility model discloses a no blade wind turbine, the magnetic gear case, double-fed type aerogenerator, wind energy capture efficiency is high, need not long and heavy blade, need not the lubricated cooling system of bulky oiling, need not to carry out maximum power point tracking, need not to untie the cable, can reduce the complete machine volume greatly, the weight is lightened, the efficiency of power generation is improved, thereby greatly reduced transportation, the installation, operation maintenance and complete machine cost, really realize large-scale wind generating set lightweight, it is miniaturized, low cost, the target of high benefit, can eliminate the development bottleneck of super large-power wind generating set.

Claims (3)

1. The utility model provides a no blade high-power double-fed type wind generating set which characterized in that: the method comprises the following steps: the wind power generation system comprises a wind turbine, a magnetic gear box, a double-fed wind power generator, a converter system of the double-fed wind power generator and a tower;

the wind turbine comprises: the device comprises an airflow speed increaser, an air guide part, a working part, an exhaust pipe and a yawing part;

the air flow speed increaser is a horn-shaped pipeline, a large port of the air flow speed increaser is an air entraining port, air is blown in from the large port, and a small port of the air flow speed increaser is fixed with the air guide part;

the air guide part comprises an air guide circular tube, an air guide mechanism and a nozzle; the air guide mechanism comprises a guide vane and a rotating shaft mechanism, and the rotating shaft mechanism is used for adjusting the guide angle of the guide vane so as to change the size of the air flow; the guide vane, the rotating shaft mechanism and the nozzle are arranged in the air guide circular tube, and the inlet end of the air guide circular tube is fixed with the small port of the airflow speed increaser;

the working parts comprise a rotating wheel, a main shaft bearing and a working circular pipe; the rotating wheel is arranged in the middle of the working circular tube; the main shaft is fixed with the rotating wheel, and the other end of the main shaft is fixed with a rotating shaft of the synchronous wind driven generator through a generator coupler; the main shaft bearing is sleeved on the outer side of the main shaft and is arranged at the joint of the working circular tube and the tower; the rotating wheel, the main shaft bearing, the generator coupler and the rotating shaft of the synchronous wind driven generator are all concentric; one end of the working circular tube is fixed with the air guide circular tube, and the other end of the working circular tube is fixed with the exhaust pipe;

the exhaust pipe is an open horn-shaped exhaust pipeline, a small port of the exhaust pipe is fixed with a working circular pipe of the working component, and a large port of the exhaust pipe is an exhaust port;

the yaw assembly includes: a tail vane and a yaw bearing; the tail vane is fixedly arranged at the rear end of the exhaust pipe, the yaw bearing is arranged at the joint of the working circular pipe and the tower, the outer ring of the yaw bearing is fixed with the tower, and the inner ring of the yaw bearing is sleeved outside the main shaft bearing and is fixed with the working circular pipe;

the magnetic gear box consists of three-level magnetic gears including a low-speed level magnetic gear, a medium-speed level magnetic gear and a high-speed level magnetic gear, an input shaft and an output shaft; the low-speed level magnetic gear, the medium-speed level magnetic gear and the high-speed level magnetic gear are all coaxial magnetic gears, and the coaxial magnetic gears comprise: the magnetic control device comprises an outer rotor, an inner rotor, a magnetic regulating ring and a shell;

the input shaft of the magnetic gearbox is connected with the main shaft of the wind turbine through a coupler; an output shaft of the magnetic gear box is fixed with a rotating shaft of the doubly-fed wind driven generator through a generator coupler;

the double-fed wind driven generator and the converter system thereof comprise: a double-fed wind power generator and a converter system; the double-fed wind driven generator comprises a three-phase alternating current stator and a rotor, wherein the three-phase alternating current stator is connected with a power grid through a boosting transformer; the converter system comprises a rotor-side converter, a network-side converter, a bidirectional direct-current converter and energy storage equipment; the rotor-side converter is used for regulating and controlling the rotor exciting current and the rotating speed of the doubly-fed wind driven generator, so that the stator voltage of the doubly-fed wind driven generator is controlled to have the same amplitude, the same phase and the same frequency with the grid voltage, and grid connection is realized; the grid-side converter is a bidirectional converter, the alternating current side of the grid-side converter is connected with the stator of the doubly-fed wind driven generator, one end of the direct current side of the grid-side converter is connected with the direct current side of the rotor-side converter, and the other end of the direct current side of the grid-side converter is connected with the bidirectional direct current converter; the alternating current side of the rotor side converter is connected with the rotor of the doubly-fed wind generator; and the other end of the bidirectional direct current converter is connected with the energy storage equipment.

2. The bladeless high-power doubly-fed wind generating set according to claim 1, wherein: in order to increase the power of the air flow and facilitate braking, the wind turbine may be equipped with a booster brake comprising two ducts: a first conduit and a second conduit; one end of the first pipeline is fixedly arranged in front of the outer part of the exhaust pipe, and the other end of the first pipeline is fixedly arranged in front of the outer part of the circular air guide pipe; one end of the second pipeline is fixedly arranged behind the outer part of the exhaust pipe, and the other end of the second pipeline is fixedly arranged behind the outer part of the airflow speed increaser.

3. The bladeless high-power doubly-fed wind generating set according to claim 2, wherein: for a wind turbine with higher power, a yaw system can be adopted as a yaw component of the wind turbine, and the yaw system comprises a yaw large gear ring, a side bearing, a yaw driving device and a yaw brake; the yaw large gear ring is fixed with the tower through bolts; the yaw driving device comprises a yaw motor, a speed reducer of the yaw motor and a pinion, the pinion is meshed with a yaw large gear ring, and the yaw driving device is fastened on a working circular pipe of the working component through a bolt.

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