CN103138480B - Wind power generation plant - Google Patents

Abstract

A wind power generation device, the wind turbine (11) is connected to the planetary carrier (202) of the third planetary gear (20), the planetary carrier (22) of the first planetary gear, the outer ring gear (33) of the second planetary gear The rotor (62) of the generator is connected together; the stator winding of the generator is directly connected to the grid (12); the rotor (42) of the first speed-regulating motor (4), the sun of the first planetary gear wheel (21) and the sun gear (201) of the third planetary gear are connected together; the rotor (52) of the second speed regulating motor (5) and the sun gear (31) of the second planetary gear are connected together; the third planetary gear There is a lock (7) between the outer ring gear (203) of the gear and the casing of the wind power generation device; the planet carrier (32) of the second planetary gear and the outer ring gear (2) of the first planetary gear (2) 23) connection, there is a clutch (8) between the planetary carrier (32) of the second planetary gear and the planetary carrier (202) of the third planetary gear.

Description

wind power plant

This application is a divisional application of "Wind Power Generation Device" (application number: 201110171837.9, filing date: June 24, 2011).

technical field

The invention relates to wind power generating equipment, in particular to the equipment for realizing variable wind speed input and constant frequency output in the wind power generation system.

Background technique

As the whole society pays attention to energy and environmental issues, the development and utilization of renewable energy is showing a trend of accelerated development. Wind energy is one of the most mature renewable energy that exists widely in the world and is mastered by people. At present, the mainstream wind power generation system is double-fed generator and direct drive system. The stator of the double-fed power generation system is directly connected to the grid, and the speed is adjusted by adjusting the slip power in the rotor winding. Therefore, the rotor winding needs a set of high-power inverter. At the same time, the reliability and life of the slip rings and brushes on the rotor are not high, and regular maintenance is required; the direct drive system cancels the speed-up gear from the wind turbine to the generator, but the direct drive generator works at a low speed, and the generator needs The larger diameter of the stator and rotor and the larger number of pole pairs increase the difficulty in the design and manufacture of the generator. At the same time, due to the randomness of wind energy, which fluctuates from big to small, when the wind speed is lower than the rated wind speed, the wind wheel can absorb the wind energy to the maximum extent, and when the wind speed is higher than a certain limit, in order to keep the output frequency of the generator constant, the wind turbine is adjusted. The blade pitch causes the wind rotor to stall, so that the wind energy cannot be fully utilized. In order to solve the above problems, patents 200710019236.X, 200720033191.7, 200810100747.9, and 200820116054.4 proposed wind turbines with electrical stepless speed change, which convert wind energy with variable speed into electrical energy and mechanical energy with constant frequency output through dual mechanical port motors. However, this type of motor has a complex structure and is difficult to process and manufacture, and there are also maintenance problems of brushes and slip rings. Therefore, a variable-speed constant-frequency wind power generation device with high efficiency, reliability, and simple control is the long-term pursuit of technicians in this field. Although the patent 200910089259.7 realizes variable-speed constant-frequency, when the wind energy is very large or small, the capacity of the speed-regulating motor is relatively large. , making it difficult to reduce the system size and cost.

Contents of the invention

The purpose of the present invention is to overcome the disadvantages of the prior art, and provide a wind power generating device that converts energy input at variable speeds into output at constant speeds.

The wind power generating device of the present invention includes an active stepless speed regulating device, a wind turbine and a generator.

The active stepless speed regulating device of the present invention at least includes: a first planetary gear, a second planetary gear, a first speed regulating motor, a second speed regulating motor, a first power converter, a second power converter, a lock The planetary gear includes the planetary carrier, the outer ring gear and the sun gear, the speed-regulating motor includes two parts, the stator and the rotor, and the power converter converts the electric energy of the grid into variable-voltage and variable-frequency alternating current to supply power to the speed-regulating motor. The planetary carrier of the first planetary gear is rigidly connected to the planetary carrier of the second planetary gear through the first shaft of the active stepless speed regulating device, the rotor of the first speed regulating motor is rigidly connected with the sun gear of the first planetary gear, and the second speed regulating The rotor of the motor is rigidly connected to the sun gear of the second planetary gear. There is a lock between the outer ring gear of the first planetary gear and the casing. The locker is closed to make the outer ring gear not rotate. The outer ring gear of the first planetary gear There is a clutch between the outer ring gear and the sun gear of the second planetary gear. Closing the clutch can make the outer ring gear of the first planetary gear rotate synchronously with the sun gear of the second planetary gear. The outer ring gear of the second planetary gear acts as an active Two shafts with stepless speed regulation. Adjust the speed of the sun gear of the first planetary gear and the sun gear of the second planetary gear by controlling the speed regulating motor, so that when the speed of one shaft of the active stepless speed regulating device changes, the second shaft of the active stepless speed regulating device remains at Run at the set speed to realize the stepless speed change function.

At the same time, when the speed of the first shaft of the active stepless speed regulating device is lower than the set speed, the lock is closed, the clutch is opened, and the active stepless speed regulating device works in mode one; when the first shaft of the active stepless speed regulating device When the rotation speed of the active stepless speed control device is greater than the set speed, the lock is opened, the clutch is closed, and the active stepless speed control device works in mode 2; when the speed of the first axis of the active stepless speed control device is equal to the set speed, the lock device And the clutch switch changes, that is, the switching between mode 1 and mode 2; this can ensure that the two shafts of the active stepless speed control device always work at a fixed speed, and at the same time ensure that the capacity of the speed control motor is small.

The switch from mode 1 to mode 2 occurs when the rotor speed of the second speed regulating motor is zero, that is, when the speed of the first shaft of the active stepless speed regulating device is lower than the set speed, the lock is closed, the clutch is opened, and the active The stepless speed regulating device works in mode 1, and the speed of the second speed regulating motor is a negative value; as the speed of the first shaft of the active stepless speed regulating device increases, when the speed of the first shaft of the active stepless speed regulating device is equal to the set When the speed is constant, the speed of the second speed regulating motor gradually decreases to zero, at this time, the clutch is closed and the lock is opened; the speed of the first shaft of the active stepless speed regulating device continues to increase, when the active stepless speed regulating device When the rotational speed of the shaft is greater than the set rotational speed, the active stepless speed regulating device works in mode two.

The invention realizes stepless speed regulation by continuously controlling the speed of the speed regulation motor, and since the speed regulation motor can input or output energy to the device, the system is an active stepless speed regulation device.

The wind power generation device of the present invention includes at least one wind turbine, two planetary gears: the first planetary gear, the second planetary gear; two speed-regulating motors: the first speed-regulating motor, the second speed-regulating motor; two power converters: A first power converter, a second power converter; a generator, a lockup and a clutch. The planetary carrier of the first planetary gear is rigidly connected to the wind turbine through the first shaft of the active stepless speed regulating device and the planetary carrier of the second planetary gear, and the rotor of the first speed regulating motor is rigidly connected to the sun gear of the first planetary gear. The rotor of the second speed-regulating motor is rigidly connected to the sun gear of the second planetary gear. There is a lock between the outer ring gear of the first planetary gear and the casing. The locker can make the outer ring gear of the first planetary gear Fixed and non-rotating, there is a clutch between the outer ring gear of the first planetary gear and the sun gear of the second planetary gear. Closing the clutch can make the outer ring gear of the first planetary gear rotate synchronously with the sun gear of the second planetary gear. The outer ring gear of the planetary gear is rigidly connected to the rotor of the generator, and the stator winding of the generator is directly connected to the grid. The first speed-regulating motor is connected to the power grid through the first power converter, and the second speed-regulating motor is connected to the power grid through the second power converter. winding power supply.

At the same time, there is a signal line connection between the power converter and the speed-regulating motor for communication.

The speed-regulating motor and generator can be permanent magnet motor, asynchronous motor or other types of motors as required.

In the wind power generation device of the present invention, when the speed of the wind turbine is lower than the set speed, the lock is closed, the clutch is opened, and the wind power generation device works in mode one; when the speed of the wind machine is greater than the set speed, the lock is Open, the clutch is closed, and the wind power generator works in mode 2; when the speed of the wind turbine is equal to the set speed, the lock and clutch switch are changed, that is, the switch between mode 1 and mode 2; as mentioned above, when the wind turbine When the rotational speed is equal to the set rotational speed, the switching mode of the wind power generation device can be selected as required. This can ensure that the generator always works at a fixed speed and at the same time ensure the smoothness of the switching process. The switch from mode 1 to mode 2 occurs when the rotor speed of the second speed-regulating motor is zero, that is, when the speed of the wind turbine is lower than the set speed, the lock is closed, the clutch is opened, and the wind power generator works in mode 1. The speed of the second speed-regulating motor is a negative value; as the speed of the wind turbine increases, when the speed of the wind turbine is equal to the set speed, the speed of the second speed-regulating motor gradually decreases to zero. At this time, the clutch is closed and the lock is opened. The speed of the wind turbine continues to increase. When the speed of the wind turbine is greater than the set speed, the wind power generator works in mode two.

When the device of the present invention works in mode 1, a part of the wind energy is transmitted to the planetary carrier of the first planetary gear through the wind turbine to drive the planetary carrier to rotate. Since the locker is closed, the outer ring gear of the first planetary gear is fixed and does not rotate, and the planetary gear All the energy on the rack is transmitted to the sun gear of the first planetary gear, which drives the first speed-regulating motor to generate electricity. The generated energy is converted into an alternating current with the same phase and voltage as the grid through the first power converter, and fed back to the grid. The second speed-regulating motor measures the speed and other information of the motor through the sensor, and feeds it back to the second power converter through the signal line. The stator windings of the stator provide alternating currents of different frequencies and voltages, and control the second speed-regulating motor to run at the set speed. By adjusting the speed of the second speed-regulating motor, the speed of the outer ring gear of the second planetary gear is kept constant at the set generator speed. Working speed. At this time, another part of the wind energy of the wind turbine is transmitted to the outer ring gear of the planetary gear through the planet carrier of the second planetary gear, converted into electric energy by the generator, and input to the grid, and the remaining part of the energy is transmitted to the second speed-regulating motor through the sun gear , through the second power converter to convert the alternating current with the same phase and voltage as the grid and input to the grid.

When the device of the present invention works in mode 2, a part of the wind energy is transmitted to the planetary carrier of the first planetary gear through the wind turbine to drive the planetary carrier to rotate. Since the clutch is closed at this time, the outer ring gear of the first planetary gear and the second planetary gear The sun gear of the gear rotates synchronously, and part of the energy on the planetary carrier is transferred to the sun gear of the first planetary gear, driving the first speed-regulating motor to generate electricity, and the generated energy is converted into an alternating current with the same phase and voltage as the grid through the first power converter , feed back to the power grid; the other part is transmitted to the outer ring gear of the first planetary gear to drive the second speed-regulating motor to generate electricity, and the generated energy is converted into alternating current with the same phase and voltage as the power grid through the second power converter, and fed back to the power grid. The second speed-regulating motor measures the speed and other information of the motor through the sensor, and feeds it back to the second power converter through the signal line. The stator windings of the stator provide alternating currents of different frequencies and voltages, and control the second speed-regulating motor to run at the set speed. By adjusting the speed of the second speed-regulating motor, the speed of the outer ring gear of the second planetary gear is kept constant at the set generator speed. Working speed. At this time, the remaining part of the wind energy of the wind turbine is transmitted to the outer ring gear of the planetary gear through the planet carrier of the second planetary gear, converted into electrical energy by the generator, and input to the grid, and the remaining part of the energy is transmitted to the second speed-regulating motor through the sun gear , through the second power converter, it is converted into alternating current with the same phase and voltage as the grid and input to the grid.

At the same time, the wind turbine can be connected with the planet carrier of the first planetary gear through the speed change gear, the first speed regulating motor can be connected with the sun gear of the first planetary gear through the speed change gear, and the second speed regulating motor can be connected with the first planetary gear through the speed change gear. The sun gear of the second planetary gear is connected, and the generator can be connected with the outer ring gear of the second planetary gear through the transmission gear, so as to facilitate mechanical design and motor design, increase the speed of the motor, and reduce volume and cost.

The present invention can also have another structural form: the wind power generation device of the present invention includes at least one wind turbine, three planetary gears: the first planetary gear, the second planetary gear, the third planetary gear; two speed-regulating motors: the first planetary gear A speed-regulating motor and a second speed-regulating motor; two power converters: a first power converter and a second power converter; a generator, a lock and a clutch. The wind turbine is rigidly connected to the planetary carrier of the third planetary gear, the planetary carrier of the first planetary gear and the planetary carrier of the second planetary gear are rigidly connected together, the rotor of the first speed regulating motor, the sun gear of the first planetary gear and the second The sun gears of the three planetary gears are rigidly connected together, the rotor of the second speed regulating motor, the sun gear of the second planetary gear and the outer ring gear of the first planetary gear are rigidly connected together, and the outer ring gear of the third planetary gear is connected with the outer ring gear of the first planetary gear. There is a locking device between the casings of the above-mentioned wind power generation device. When the locking device is closed, the outer ring gear of the third planetary gear can be fixed and does not rotate. There is a Clutch, clutch closing can make the planetary carrier of the first planetary gear, the planetary carrier of the second planetary gear, and the planetary carrier of the third planetary gear rotate synchronously, the outer ring gear of the second planetary gear is rigidly connected with the rotor of the generator, and the generator The stator windings are directly connected to the grid. The first speed-regulating motor is connected to the power grid through the first power converter, and the second speed-regulating motor is connected to the power grid through the second power converter. winding power supply.

At the same time, there is a signal line connection between the power converter and the speed-regulating motor for communication. The speed-regulating motor and generator can be permanent magnet motor, asynchronous motor or other types of motors as required.

In the wind power generation device of the present invention, when the speed of the wind turbine is lower than the set speed, the lock is closed, the clutch is opened, and the wind power generation device works in mode one; when the speed of the wind machine is greater than the set speed, the lock is Open, the clutch is closed, and the wind power generation device works in mode two; when the speed of the wind turbine is equal to the set speed, the rotor speed of the second speed regulating motor is zero, the lock is closed, the clutch is opened, and the mode two is mode one. Switching; when the speed of the wind turbine is equal to the set speed, the lock is opened, the clutch is closed, and the mode is switched from mode 1 to mode 2; as mentioned above, when the speed of the wind turbine is equal to the set speed, the wind power generation device can be selected Switch modes. This can ensure that the generator always works at a fixed speed and at the same time ensure the smoothness of the switching process. The switch from mode 1 to mode 2 occurs when the rotor speed of the second speed-regulating motor is zero, that is, when the speed of the wind turbine is lower than the set speed, the lock is closed, the clutch is opened, and the wind power generator works in mode 1. The speed of the second speed-regulating motor is a negative value; as the speed of the wind turbine increases, when the speed of the wind turbine is equal to the set speed, the speed of the second speed-regulating motor gradually decreases to zero. At this time, the clutch is closed and the lock is opened. The speed of the wind turbine continues to increase. When the speed of the wind turbine is greater than the set speed, the wind power generator works in mode two.

The third structural form of the present invention is: the wind power generation device of the present invention includes at least one wind turbine, three planetary gears: the first planetary gear, the second planetary gear, and the third planetary gear; Speed motor, the second speed motor; two power converters: the first power converter, the second power converter; a generator, a lock and a clutch. The wind turbine is rigidly connected to the planetary carrier of the third planetary gear, the planetary carrier of the first planetary gear is rigidly connected to the rotor of the generator, and the stator winding of the generator is directly connected to the grid. The rotor of the first speed-regulating motor, the sun gear of the first planetary gear, the sun gear of the second planetary gear, and the sun gear of the third planetary gear are rigidly connected together, and the rotor of the second speed-regulating motor and the outer gear of the second planetary gear The ring gears are rigidly connected together, and there is a lock between the outer ring gear of the third planetary gear and the casing of the wind power generation device. The locker can be closed so that the outer ring gear of the third planetary gear cannot rotate. The planetary carrier of the second planetary gear is rigidly connected with the outer ring gear of the first planetary gear, and there is a clutch between the planetary carrier of the second planetary gear and the planetary carrier of the third planetary gear. The planet carrier, the planet carrier of the third planetary gear and the wind turbine rotate synchronously. The first speed-regulating motor is connected to the power grid through the first power converter, and the second speed-regulating motor is connected to the power grid through the second power converter. winding power supply.

At the same time, there is a signal line connection between the power converter and the speed-regulating motor for communication. The speed-regulating motor and generator can be permanent magnet motor, asynchronous motor or other types of motors as required.

In the wind power generation device of the present invention, when the speed of the wind turbine is lower than the set speed, the lock is closed, the clutch is opened, and the wind power generation device works in mode one; when the speed of the wind machine is greater than the set speed, the lock is Open, the clutch is closed, and the wind power generation device works in mode two; when the speed of the wind turbine is equal to the set speed, the rotor speed of the second speed regulating motor is zero, the lock is closed, the clutch is opened, and the mode two is mode one. Switching; when the speed of the wind turbine is equal to the set speed, the lock is opened, the clutch is closed, and the mode is switched from mode 1 to mode 2; as mentioned above, when the speed of the wind turbine is equal to the set speed, the wind power generation device can be selected Switch modes. This can ensure that the generator always works at a fixed speed and at the same time ensure the smoothness of the switching process. The switch from mode 1 to mode 2 occurs when the rotor speed of the second speed-regulating motor is zero, that is, when the speed of the wind turbine is lower than the set speed, the lock is closed, the clutch is opened, and the wind power generator works in mode 1. The speed of the second speed-regulating motor is a negative value; as the speed of the wind turbine increases, when the speed of the wind turbine is equal to the set speed, the speed of the second speed-regulating motor gradually decreases to zero. At this time, the clutch is closed and the lock is opened. The speed of the wind turbine continues to increase. When the speed of the wind turbine is greater than the set speed, the wind power generator works in mode two.

The fourth structural form of the present invention is: the wind power generation device of the present invention includes at least one wind turbine, three planetary gears: the first planetary gear, the second planetary gear, and the third planetary gear; two speed-regulating motors: the first planetary gear Speed motor, the second speed motor; two power converters: the first power converter, the second power converter; a generator, a lock and a clutch. The wind turbine is rigidly connected to the planetary carrier of the third planetary gear, the planetary carrier of the first planetary gear, the outer ring gear of the second planetary gear and the generator rotor are rigidly connected together, and the stator winding of the generator is directly connected to the grid. The rotor of the first speed-adjusting motor, the sun gear of the first planetary gear and the sun gear of the third planetary gear are rigidly connected together, the rotor of the second speed-regulating motor, and the sun gear of the second planetary gear are rigidly connected together, and the third There is a lock between the outer ring gear of the planetary gear and the casing of the wind power generation device. The locker can be closed so that the outer ring gear of the third planetary gear cannot rotate. The planetary carrier of the second planetary gear and the first The outer ring gear of the planetary gear is rigidly connected, and there is a clutch between the planetary carrier of the second planetary gear and the planetary carrier of the third planetary gear. When the clutch is closed, the outer ring gear of the first planetary gear, the planetary carrier of the second planetary gear, The planet carrier of the third planetary gear rotates synchronously. The first speed-regulating motor is connected to the power grid through the first power converter, and the second speed-regulating motor is connected to the power grid through the second power converter. winding power supply.

At the same time, there is a signal line connection between the power converter and the speed-regulating motor for communication. The speed-regulating motor and generator can be permanent magnet motor, asynchronous motor or other types of motors as required.

In the wind power generation device of the present invention, when the speed of the wind turbine is lower than the set speed, the lock is closed, the clutch is opened, and the wind power generation device works in mode one; when the speed of the wind machine is greater than the set speed, the lock is Open, the clutch is closed, and the wind power generation device works in mode two; when the speed of the wind turbine is equal to the set speed, the rotor speed of the second speed regulating motor is zero, the lock is closed, the clutch is opened, and the mode two is mode one. Switching; when the speed of the wind turbine is equal to the set speed, the lock is opened, the clutch is closed, and the mode is switched from mode 1 to mode 2; as mentioned above, when the speed of the wind turbine is equal to the set speed, the wind power generation device can be selected Switch modes. This can ensure that the generator always works at a fixed speed and at the same time ensure the smoothness of the switching process. The switch from mode 1 to mode 2 occurs when the rotor speed of the second speed-regulating motor is zero, that is, when the speed of the wind turbine is lower than the set speed, the lock is closed, the clutch is opened, and the wind power generator works in mode 1. The speed of the second speed-regulating motor is a negative value; as the speed of the wind turbine increases, when the speed of the wind turbine is equal to the set speed, the speed of the second speed-regulating motor gradually decreases to zero. At this time, the clutch is closed and the lock is opened. The speed of the wind turbine continues to increase. When the speed of the wind turbine is greater than the set speed, the wind power generator works in mode two.

The above-mentioned wind power generation device of the present invention has improvement scheme one, scheme two and scheme three and can adopt gear speed change when wind turbine, first speed-regulating motor, second speed-regulating motor and generator are connected with this device equally, carry out improvement, make Wind power plants are smaller and cheaper.

The above-mentioned device of the present invention mainly has two modes. On the basis of the above-mentioned two mode devices, through combination, integrated solutions such as planetary three modes, four modes and multi-modes can be realized, which will not be described one by one here.

Beneficial effects of the present invention:

1. Compared with the traditional double-fed motor system, the present invention simplifies the structure of the wind power generating set, saves the brush and slip ring device, and improves the reliability and maintainability.

2. Through the control of the speed-regulating motor, the generator can work at a fixed speed to realize variable-speed and constant-frequency operation, and can make full use of the mature technology of constant-frequency power generation.

3. Compared with the direct-drive generator system, the electric energy in the device of the present invention is generated by a conventional generator and directly input to the power grid without going through a power electronic device, so the power quality is good.

4. It can be used as a starter motor to start and brake the wind wheel.

5. The capacity of the speed regulating motor is effectively reduced.

6. The planetary gear has the function of increasing the speed, which can increase the speed and reduce the torque, thereby reducing the volume of the generator.

Description of drawings

Fig. 1 is a schematic structural view of a wind power generation device according to the first exemplary embodiment of the present invention; in the figure: active stepless speed regulating device one shaft 1, active stepless speed regulating device two shafts 100, first planetary gear 2 , the second planetary gear 3, the first speed regulating motor 4, the second speed regulating motor 5, the first power converter 9, the second power converter 10, the lock 7, the clutch 8, the power grid 12; the first planetary gear The planet carrier 22, the outer ring gear 23, the sun gear 21; the planet carrier 32 of the second planetary gear, the outer ring gear 33, the sun gear 31; the rotor 42, the stator 41 of the first speed regulating motor; the second speed regulating motor Rotor 52, stator 51;

Fig. 2 is a schematic structural view of the active stepless speed regulating device in the first embodiment of the present invention; among the figures: a wind turbine 11, a generator 6, a rotor 62 of the generator, and a stator 61;

Fig. 3 is a schematic structural view of a modified wind power generator with gear shifting on the basis of the first embodiment of the present invention; Speed change gear 16;

Fig. 4 is a schematic structural view of a wind power generator according to the second embodiment of the present invention; in the figure: the third planetary gear 20, wherein the sun gear 201, the planetary carrier 202, and the outer ring gear 203;

Fig. 5 is a schematic structural view of a wind power generation device according to a third embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a wind power generation device according to a fourth embodiment of the present invention.

Detailed ways

The wind power generating device of the present invention includes an active stepless speed regulating device, a wind turbine and a generator. Next, a wind power generation device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a wind power generation device according to a first embodiment of the present invention. Fig. 2 is a schematic structural diagram of the active stepless speed regulation device in the wind power generation device according to the first embodiment of the present invention.

As shown in FIG. 1 , the wind power generation device includes an active stepless speed regulation device 1000 , a wind turbine 11 and a generator 6 . The wind turbine 11 is connected to one shaft 1 of the active stepless speed regulation device 1000 , and the generator 6 is connected to two shafts 100 of the active stepless speed regulation device 1000 . The wind turbine 11 rotates under the wind force, converts the wind energy into mechanical energy, and transmits it to the active stepless speed regulating device 1000, and the active stepless speed regulating device 1000 converts it into mechanical energy at a constant speed, and transmits it to the generator 6 to generate electricity The machine 6 feeds back the electrical energy to the grid 12.

As shown in Figures 1 and 2, the active stepless speed regulating device 1000 includes two planetary gears: the first planetary gear 2 and the second planetary gear 3; two speed regulating motors: the first speed regulating motor 4 and the second planetary gear Speed-regulating motor 5; two power converters: a first power converter 9 and a second power converter 10; a locker 7 and a clutch 8. The planetary carrier 22 of the first planetary gear 2 is rigidly connected with the planetary carrier 32 of the second planetary gear 3 through an active stepless speed regulating device shaft 1, and the rotor 42 of the first speed regulating motor 4 is connected to the sun of the first planetary gear 2 The wheel 21 is rigidly connected, the rotor 52 of the second speed regulating motor 5 is rigidly connected with the sun gear 31 of the second planetary gear 3, and there is a lock between the outer ring gear 23 of the first planetary gear 2 and the casing of the wind power generator. Locker 7, the locker 7 is closed to make the outer ring gear 23 of the first planetary gear 2 fixed and does not rotate, and there is a clutch 8 between the outer ring gear 23 of the first planetary gear 2 and the sun gear 31 of the second planetary gear 3 , the clutch 8 is closed to make the outer ring gear 23 of the first planetary gear 2 and the sun gear 31 of the second planetary gear 3 rotate synchronously, and the outer ring gear 33 of the second planetary gear 3 and the two shafts of the active stepless speed regulating device 100 rigid connections. The first power converter 9 connects the first speed-regulating motor 4 to the grid 12 or other power sources, and the second power converter 10 connects the second speed-regulating motor 5 to the grid 12 or other power sources.

For planetary gears the following relationship exists:

ω _s =(1+ρ)×ω _c -ω _r /ρ

ω _c ＝ρ×ω _s /(1+ρ)+ω _r /(1+ρ)

ω _r =(1+ρ)×ω _c -ρ×ω _s

T _s =ρ×T _c /(1+ρ)=ρ×T _r (1)

T _r =T _c /(1+ρ)

ρ = number of teeth of sun gear / number of teeth of ring gear

In the formula, ω _s is the rotational speed of the sun gear; T _s is the torque of the sun gear;

ω _r is the speed of the ring gear; T _r is the torque of the outer ring gear;

ω _c is the rotational speed of the planet carrier; T _c is the torque of the planet carrier;

It can be seen from the above formula (1) that there is a strict relationship between the speeds of the sun gear, the planet carrier and the outer ring gear of the planetary gear, and this relationship is related to the ratio ρ of the number of teeth of the sun gear to the number of teeth of the outer ring gear. When ρ is determined, the three components of the active stepless speed regulating device, the outer ring gear, the sun gear, and the planetary carrier, have two degrees of mechanical rotation freedom, that is, the outer ring gear, sun gear, and planetary gear of the active stepless speed regulating device After the rotation speed of any two parts in the frame is determined, the speed of the third part is uniquely determined.

In the active stepless speed regulating device of the present invention, there are two sets of planetary gears, the first planetary gear 2 and the second planetary gear 3, both of which have the above-mentioned relationship, and the planet carrier 22 of the first planetary gear 2 and the second planetary gear The planet carrier 32 of the gear 3 is rigidly connected. When the lock 7 is closed and the clutch 8 is opened, this working state is mode 1. At this time, the relationship is as follows:

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; 100</span>}}\\ {\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; 100</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\end{array}\right.<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

In the formula,

ω _m1 is the rotating speed of the first speed-regulating motor 4;

ω _m2 is the rotating speed of the second speed-regulating motor 5;

ω ₁ is the rotational speed of the first shaft 1 of the active continuously variable transmission device;

ω ₁₀₀ is the rotational speed of the two shafts 100 of the active continuously variable transmission;

ρ1 is the ratio of the number of teeth of the sun gear of the _first planetary gear to the number of teeth of the outer ring gear;

_ρ2 is the ratio of the number of teeth of the sun gear of the second planetary gear to the number of teeth of the outer ring gear.

According to formula (2), it can be seen that when the rotational speed ω ₁ of the first shaft 1 of the active continuously variable transmission device changes, the speed of the second shaft 100 of the active continuously variable transmission device can be guaranteed by adjusting the rotational speed ω _m2 of the second speed-regulating motor 5 . The rotational speed ω ₁₀₀ remains unchanged, realizing stepless speed regulation. But, in this mode, when the rotating speed ω ₁ of active continuously variable transmission device first axis 1 is very high, the rotating speed ω _m2 of adjusting the second speed-regulating motor 5 will be very high, cause the adjustment of the second speed-regulating motor 5 and The capacity of the second power converter 10 is relatively large, resulting in large system volume and high cost. Therefore, set the mode switching speed ω ₁₂ , when the speed ω ₁ <ω ₁₂ of the first shaft 1 of the active continuously variable transmission device, the active continuously variable transmission device adopts the above-mentioned working mode one, and when the active continuously variable transmission device When the rotational speed ω ₁ of shaft 1 >ω ₁₂ , the lock 7 is opened and the clutch 8 is closed. This working state is called mode 2. At this time, the relationship is as follows:

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; 100</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; 100</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\end{array}\right.<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

It can be seen that the first speed-regulating motor 4 participates in the speed-regulating work, shares part of the power output, and reduces the capacity of the second speed-regulating motor 5 and the second power converter 10 .

Therefore, the wind power generation device of the present invention can control the ratio of the first shaft 1 of the active continuously variable transmission device and the second shaft 100 of the active continuously variable transmission device by adjusting the speed of the second speed-regulating motor 5, and this ratio can be continuously changed , which realizes stepless speed regulation. On the other hand, two working modes are adopted according to different working conditions, which effectively reduces the capacity of the speed regulating motor.

As shown in Figure 1, the wind power generation device includes an above-mentioned active stepless speed regulating device, wherein, the wind turbine 11 is rigidly connected with the shaft 1 of the active stepless speed regulating device, and the rotor 62 of the generator 6 is connected to the shaft 1 of the active stepless speed regulating device. The two shafts 100 of the active stepless speed regulating device are rigidly connected, and the winding of the stator 61 of the generator 6 is directly connected with the grid 12 .

In operation, when the speed of the wind turbine 11 is lower than the set speed, the lock 7 is closed, the clutch 8 is opened, and the wind power generation device of the present invention works in mode one; when the speed of the wind turbine 11 is greater than the set speed, the locking The switch 7 is opened, the clutch 8 is closed, and the wind power generator works in mode 2; this can ensure that the generator 6 always works at a constant speed, and at the same time ensures the stability of the switching process.

The switch from mode one to mode two occurs when the rotor 52 speed of the second speed-regulating motor 5 is zero, that is, when the speed of the wind turbine is less than the set speed, the locker is closed 7, the clutch 8 is opened, and the wind power generator works at Mode 1, the speed of the second speed-regulating motor 5 is a negative value; as the speed of the wind turbine 11 increases, when the speed of the wind turbine 11 is equal to the set speed, the speed of the second speed-regulating motor 5 gradually decreases to zero, At this time, the clutch 8 is closed, and the lock 7 is opened; the speed of the wind turbine 11 continues to increase, and when the speed of the wind turbine 11 is greater than the set speed, the wind power generator works in mode two. Similarly, mode 2 can be switched to mode 1.

In Fig. 1, when the wind power generation device of the present invention works in mode 1, a part of wind energy is transmitted to the planetary carrier 22 of the first planetary gear 2 through the wind turbine 11, and the planetary carrier 22 is driven to rotate. Since the locker 7 is closed, the first planetary The outer ring gear 23 of the gear 2 is fixed and does not rotate, and all the energy on the planetary carrier 22 is transferred to the sun gear 21 of the first planetary gear 2 to drive the first speed-regulating motor 4 to generate electricity, and the generated energy is converted by the first power converter 9 It is an alternating current with the same phase and voltage as the grid 12 and fed back to the grid 12 . The second speed-regulating motor 5 measures information such as the speed of the motor 5 through the sensor, and feeds back to the second power converter 10 through the signal line, and the second power converter 10 sends the information of the set speed and the feedback speed of the second speed-regulating motor 5 to the second power converter 10. The stator 51 windings of the second speed-regulating motor 5 provide alternating currents of different frequencies and voltages to control the second speed-regulating motor 5 to run according to the set speed. By adjusting the speed of the second speed-regulating motor 5, the outer teeth of the second planetary gear 3 The rotating speed of the ring 33 is constant at the set operating rotating speed of the generator 6 . At this time, another part of the wind energy of the wind turbine 11 is transmitted to the outer ring gear 33 of the planetary gear 3 through the planet carrier 32 of the second planetary gear 3, converted into electric energy by the generator 6, and input to the grid 12, and the remaining part of the energy is passed through the sun gear 31 is transmitted to the second speed-regulating motor 5, and is converted into AC power with the same phase and voltage as the grid 12 by the second power converter 10 and input to the grid 12.

When the wind power generation device of the present invention works in mode 2, a part of wind energy is transmitted to the planetary carrier 22 of the first planetary gear 2 through the wind turbine 11, and the planetary carrier 22 is driven to rotate. Since the clutch 8 is closed at this time, the first planetary gear 2 The outer ring gear 23 of the outer ring gear 23 rotates synchronously with the sun gear 31 of the second planetary gear 3, and part of the energy on the planet carrier 22 is transmitted to the sun gear 21 of the first planetary gear 2, driving the first speed-regulating motor 4 to generate electricity, and the generated energy passes through The first power converter 9 converts the alternating current with the same phase and voltage as the grid 12, and feeds it back to the grid 12; the other part is transmitted to the outer ring gear 23 of the first planetary gear 2 to drive the second speed-regulating motor 5 to generate electricity, and the generated energy Converted by the second power converter 10 into alternating current with the same phase and voltage as the grid 12 , and fed back to the grid 12 . The second speed-regulating motor 5 measures information such as the rotational speed of the motor 5 through a sensor, and feeds back to the second power converter 10 through a signal line, and the second power converter 10 sends information to the second power converter 10 according to the set speed of the second speed-regulating motor 5 and the feedback speed. The stator 51 windings of the second speed-regulating motor 5 provide alternating currents of different frequencies and voltages to control the second speed-regulating motor 5 to run according to the set speed. By adjusting the speed of the second speed-regulating motor 5, the outer teeth of the second planetary gear 3 The rotating speed of the ring 33 is constant at the set operating rotating speed of the generator 6 . At this time, the remaining part of the wind energy of the wind turbine 11 is transmitted to the outer ring gear 33 of the planetary gear 3 through the planet carrier 32 of the second planetary gear 3, converted into electric energy by the generator 6, and input to the grid 12, and the remaining part of the energy is passed through the sun gear 31 is transmitted to the second speed-regulating motor 5, and is converted into AC power with the same phase and voltage as the grid 12 by the second power converter 10 and input to the grid 12.

Fig. 3 is a modified example of the wind power generation device in Fig. 1 with the addition of gears for speed change. As shown in Figure 3, the wind turbine 11 is connected with the planetary carrier 22 of the first planetary gear 2 through the speed change gear 13, the first speed regulating motor 4 is connected with the sun gear 21 of the first planetary gear 2 through the speed change gear 14, the second Two speed-regulating motors 5 are connected with the sun gear 31 of the second planetary gear 3 through the speed change gear 15, and the generator 6 is connected with the outer ring gear 33 of the second planetary gear 3 through the speed change gear 16, so as to facilitate mechanical design and motor design , while increasing the speed of the motor, reducing the size and cost.

Fig. 4 is a schematic structural diagram of a wind power generation device according to a second embodiment of the present invention. As shown in the figure, the wind power generation device of the second embodiment of the present invention includes at least one wind turbine 11, three planetary gears: the first planetary gear 2, the second planetary gear 3 and the third planetary gear 20, and two speed regulating motors : a first speed-regulating motor 4 and a second speed-regulating motor 5, two power converters: a first power converter 9 and a second power converter 10, a generator 6, a lock-up 7 and a clutch 8. The wind turbine 11 is rigidly connected to the planetary carrier 202 of the third planetary gear 20, the planetary carrier 22 of the first planetary gear 2 and the planetary carrier 32 of the second planetary gear 3 are rigidly connected together, the rotor 42 of the first speed regulating motor 4, The sun gear 21 of the first planetary gear 2 and the sun gear 201 of the third planetary gear 20 are rigidly connected together, the rotor 52 of the second speed regulating motor 5, the sun gear 31 of the second planetary gear 3 and the first planetary gear 2 The outer ring gear 23 is rigidly connected together, and there is a locker 7 between the outer ring gear 203 of the third planetary gear 20 and the casing of the wind power generation device, and the locker 7 is closed to make the outer ring gear 20 of the third planetary gear 20 The ring gear 203 is fixed and does not rotate. There is a clutch 8 between the planetary carrier 32 of the second planetary gear 3 and the planetary carrier 202 of the third planetary gear 20. Closing the clutch 8 can make the planetary carrier 22 of the first planetary gear 2 and the second planetary The planetary carrier 32 of the gear 3 and the planetary carrier 202 of the third planetary gear 20 rotate synchronously, the outer ring gear 33 of the second planetary gear 3 is rigidly connected with the rotor 62 of the generator 6, and the winding of the stator 61 of the generator 6 is directly connected to the grid 12 connect. The first power converter 9 connects the first speed-regulating motor 4 to the grid 12, the second power converter 10 connects the second speed-regulating motor 5 to the grid 12, and the first power converter 9 and the second power converter 10 will The electrical energy of the grid is transformed into variable voltage and frequency alternating current to supply power to the stator windings of the first speed-regulating motor 4 and the second speed-regulating motor 5 respectively, while the first power converter 9 and the second power converter 10 are respectively connected with the first speed-regulating motor There is also a signal line connection between the motor 4 and the second speed-regulating motor 5 for communication. The first speed-regulating motor 4 , the second speed-regulating motor 5 and the generator 6 may be permanent magnet motors, asynchronous motors or other types of motors as required.

When the speed of the wind turbine 11 is lower than the set speed, the locker 7 is closed, the clutch 8 is opened, and the wind power generator works in mode one; when the speed of the wind turbine 11 is greater than the set speed, the locker 7 is opened, and the clutch 8 Closed, the wind power generation device works in mode two; this can ensure that the generator 6 always works at a fixed speed. When the rotational speed of the rotor 52 of the second speed-regulating motor 5 is zero, that is, when the rotational speed of the wind turbine 11 is equal to the set rotational speed, mode 1 and mode 2 are switched.

Similar to the first embodiment, the speed change gear can also be added, that is, the wind turbine 11 can be connected with the planet carrier 202 of the third planetary gear 20 through the speed change gear, and the first speed regulating motor 4 can be connected with the first planetary gear through the speed change gear The sun gear 21 of 2 is connected, the second variable speed motor 5 can be connected with the sun gear 31 of the second planetary gear 3 through the speed change gear, and the generator 6 can be connected with the outer ring gear 33 of the second planetary gear 3 through the speed change gear. Connection to facilitate mechanical design and motor design, while increasing the speed of the motor, reducing size and cost.

Fig. 5 is a schematic structural diagram of a wind power generation device according to a third exemplary embodiment of the present invention. As shown in Figure 5, the wind power generation device of the third embodiment of the present invention includes at least one wind turbine 11, three planetary gears: the first planetary gear 2, the second planetary gear 3 and the third planetary gear 20, two speed regulators Motor: first speed-regulating motor 4 and second speed-regulating motor 5, two power converters: first power converter 9 and second power converter 10, one generator 6, one lock-up device 7 and one clutch 8 . The wind turbine 11 is rigidly connected to the planetary carrier 202 of the third planetary gear 20 , the planetary carrier 22 of the first planetary gear 2 is rigidly connected to the rotor 62 of the generator 6 , and the winding of the stator 61 of the generator 6 is directly connected to the grid 12 . The rotor 42 of the first speed-regulating motor 4, the sun gear 21 of the first planetary gear 2, the sun gear 31 of the second planetary gear 3, and the sun gear 201 of the third planetary gear 20 are rigidly connected together, and the second speed-regulating motor 5 The rotor 52 and the outer ring gear 33 of the second planetary gear 3 are rigidly connected together, and there is a locker 7 between the outer ring gear 203 of the third planetary gear 20 and the casing of the wind power generation device, and the locker 7 Closing can make the outer ring gear 203 of the third planetary gear 20 fixed and does not rotate, the planet carrier (32) of the second planetary gear 3 is rigidly connected with the outer ring gear 23 of the first planetary gear 2, and the second planetary gear 3 There is a clutch 8 between the planetary carrier 32 of the third planetary gear 20 and the planetary carrier 202 of the third planetary gear 20, the clutch 8 can make the planetary carrier 32 of the second planetary gear 3, the planetary carrier 202 of the third planetary gear 20 and the wind turbine 11 rotate synchronously . The first speed-regulating motor 4 is connected to the grid 12 through the first power converter 9, the second power converter 10 is connected to the second speed-regulating motor 5 and the grid 12, and the first power converter 9 and the second power converter 10 will The electrical energy of the grid is transformed into variable voltage and frequency alternating current to supply power to the stator windings of the first speed-regulating motor 4 and the second speed-regulating motor 5 respectively, while the first power converter 9 and the second power converter 10 are respectively connected with the first speed-regulating motor There is also a signal line connection between the motor 4 and the second speed-regulating motor 5 for communication. The first speed-regulating motor 4 , the second speed-regulating motor 5 and the generator 6 may be permanent magnet motors, asynchronous motors or other types of motors as required.

In the wind power generation device of the third exemplary embodiment of the present invention, when the speed of the wind power machine 11 is lower than the set speed, the lock 7 is closed, the clutch 8 is opened, and the wind power generation device works in mode one; when the speed of the wind power machine 11 is greater than When the speed is set, the lock 7 is opened, the clutch 8 is closed, and the wind power generator works in mode 2; this can ensure that the generator 6 always works at a fixed speed. When the rotational speed of the rotor 52 of the second speed-regulating motor 5 is zero, the mode 1 and mode 2 are switched when the rotational speed of the wind turbine 11 is equal to the set rotational speed.

Similar to the first embodiment, the speed change gear can also be added, that is, the wind turbine 11 can be connected with the planet carrier 202 of the third planetary gear 20 through the speed change gear, and the first speed regulating motor 4 can be connected with the first planetary gear through the speed change gear The sun gear 21 of 2 is connected, the second variable speed motor 5 can be connected with the outer ring gear 33 of the second planetary gear 3 through the speed change gear, and the generator 6 can be connected with the planet carrier 22 of the first planetary gear 2 through the speed change gear. Connection to facilitate mechanical design and motor design, while increasing the speed of the motor, reducing size and cost.

Fig. 6 is a schematic structural view of a wind power generation device according to a fourth exemplary embodiment of the present invention. As shown in Fig. 6, the wind power generation device of the fourth embodiment of the present invention includes at least one wind turbine 11, three planetary gears: the first planetary gear 2, the second planetary gear 3, and the third planetary gear 20, two regulators Speed motor: the first speed-regulating motor 4 and the second speed-regulating motor 5, two power converters: the first power converter 9 and the second power converter 10, a generator 6, a lock-up device 7 and a clutch 8. The wind turbine 11 is rigidly connected to the planetary carrier 202 of the third planetary gear 20 , the planetary carrier 22 of the first planetary gear 2 , the outer ring gear 33 of the second planetary gear 3 and the rotor 62 of the generator 6 are rigidly connected together, and the generator 6 The windings of the stator 61 are directly connected to the grid 12 . The rotor 42 of the first speed-regulating motor 4, the sun gear 21 of the first planetary gear 2 and the sun gear 201 of the third planetary gear 20 are rigidly connected together, the rotor 52 of the second speed-regulating motor 5, the sun gear of the second planetary gear 3 The sun gear 31 is rigidly connected together, and there is a locker 7 between the outer ring gear 203 of the third planetary gear 20 and the casing of the wind power generation device, and the locker 7 can be closed to make the outer teeth of the third planetary gear 20 The ring 203 is fixed and does not rotate. The planetary carrier 32 of the second planetary gear 3 is rigidly connected to the outer ring gear 23 of the first planetary gear 2 . There is a clutch 8, the clutch 8 is closed to make the outer ring gear 23 of the first planetary gear 2, the planetary carrier 32 of the second planetary gear 3, and the planetary carrier 202 of the third planetary gear 20 rotate synchronously. The first power converter 9 connects the first speed-regulating motor 4 to the grid 12, the second power converter 10 connects the second speed-regulating motor 5 to the grid 12, and the first power converter 9 and the second power converter 10 will The electrical energy of the grid is transformed into variable voltage and frequency alternating current to supply power to the stator windings of the first speed-regulating motor 4 and the second speed-regulating motor 5 respectively, while the first power converter 9 and the second power converter 10 are respectively connected with the first speed-regulating motor There is also a signal line connection between the motor 4 and the second speed-regulating motor 5 for communication. The first speed-regulating motor 4 , the second speed-regulating motor 5 and the generator 6 may be permanent magnet motors, asynchronous motors or other types of motors as required.

According to the wind power generation device described in the fourth embodiment of the present invention, when the speed of the wind power machine 11 is lower than the set speed, the lock 7 is closed, the clutch 8 is opened, and the wind power generation device works in mode one; when the speed of the wind power machine 11 When the speed is greater than the set speed, the lock 7 is opened, the clutch 8 is closed, and the wind power generator works in mode 2; this can ensure that the generator 6 always works at a fixed speed. When the rotational speed of the rotor 52 of the second speed-regulating motor 5 is zero, the mode 1 and mode 2 are switched when the rotational speed of the wind turbine 11 is equal to the set rotational speed.

Similar to the first embodiment, the speed change gear can also be added, that is, the wind turbine 11 can be connected with the planet carrier 202 of the third planetary gear 20 through the speed change gear, and the first speed regulating motor 4 can be connected with the first planetary gear through the speed change gear The sun gear 21 of 2 is connected, the second variable speed motor 5 can be connected with the sun gear 31 of the second planetary gear 3 through the speed change gear, and the generator 6 can be connected with the outer ring gear 33 of the second planetary gear 3 through the speed change gear. Connection to facilitate mechanical design and motor design, while increasing the speed of the motor, reducing size and cost.

The above-mentioned device of the present invention mainly has two modes. On the basis of the above-mentioned two mode devices, through combination, integrated solutions such as three modes, four modes and multi-modes can be formed, which will not be described one by one here.

In the existing technology of wind power generation, the direct drive motor is a motor with variable working conditions. It works at different working points according to the wind speed. The working conditions of the generator are complicated, and it is difficult to guarantee a high Efficiency, the invention uses the stepless speed regulation device composed of the planetary gear and the speed regulation motor to change the output of the wind turbine with variable working conditions into a mechanical energy output at a constant speed, and the existing constant working condition generator technology can be used, such as thermal power generation And hydroelectric power generation technology, not only the technology is mature, but also the working condition of the generator is simple, and the working point is single, so that the power generation system has high efficiency. At the same time, in the direct drive power generation system, all the electric energy is output to the grid through the power converter of the direct drive generator, which will not only reduce the quality of electric energy, but also the direct drive power generation system needs a power converter with the same capacity as the generator, which not only improves System cost is reduced, system reliability is reduced, and power converter loss is caused, which further reduces system efficiency. Most of the energy in the present invention is directly fed back to the power grid through the winding of the generator, without passing through the intermediate link of the power converter, the power quality is high, the harmonics are less, and the loss is reduced and the efficiency is improved. The power converter of the present invention is only To supply power to the speed-regulating motor, the current capacity is small and the cost is saved. At the same time, the wind power generation system of the present invention saves the brush, has higher reliability and reduces maintenance compared with the doubly-fed motor system. Moreover, the device of the present invention effectively reduces the capacity of the speed-regulating motor and expands the speed range of the wind turbine through the stepless speed change of two modes, and is more suitable for large-capacity wind power generation occasions.

At the same time, the present invention converts the high-torque and low-rotational mechanical energy into high-torque and low-torque mechanical energy output through the speed regulation design of the planetary gear and the variable speed gear, so that the speed regulation motor can be a high-speed and low-torque motor with small volume , cost saving, and the required power converter is also relatively small, that is, two low-power speed-adjusting motors are used to convert the mechanical energy of high-power speed change into a constant-speed mechanical energy. At the same time, the generator can also be a motor with high speed, low torque and constant operating frequency, which also has the advantages of small size and cost saving.

The device of the present invention only needs two to three planetary gears, two speed-regulating motors, two power converters, a locking device, and a clutch to adjust the speed of the speed-regulating motor and the switching state of the clutch and locking device. That is to maintain a constant frequency of mechanical energy output. When the wind turbine transmits energy to the speed regulating device of the present invention and outputs a constant frequency electric energy to the grid, the main function of the system is to change the changing speed into a constant speed and play a role in speed regulation.

Claims (2)

1. a wind power generation plant, comprises wind energy conversion system (11), generator (6) and active stepless speed-regulating device (1000), described active stepless speed-regulating device comprises three planetary gears: first planet gear (2), second planetary gear (3) and third planet gear (20), two bunchers: the first buncher (4) and the second buncher (5), two power inverters: the first power inverter (9) and the second power inverter (10), a mechanical brake (7) and a clutch (8), described wind energy conversion system (11) is rigidly connected with the planet carrier (202) of third planet gear (20), and the planet carrier (22) of first planet gear (2), the external toothing (33) of the second planetary gear (3) and generator (6) rotor (62) three are rigidly connected, the stator winding of described generator (6) is directly connected with electrical network (12), the sun gear (201) of the rotor (42) of the first buncher (4), the sun gear (21) of first planet gear (2) and third planet gear (20) is rigidly connected, the rotor (52) of the second buncher (5), the sun gear (31) of the second planetary gear (3) are rigidly connected, have mechanical brake (7) between the external toothing (203) of third planet gear (20) and the casing of described wind power generation plant, mechanical brake (7) is closed makes the external toothing of third planet gear (20) (203) maintain static, the planet carrier (32) of the second planetary gear (3) and the external toothing (23) of first planet gear (2) are rigidly connected, clutch (8) is had, closed external toothing (23), the planet carrier (32) of the second planetary gear (3), planet carrier (202) the three's synchronous rotary of third planet gear (20) making first planet gear (2) of clutch (8) between the planet carrier (32) of the second planetary gear (3) and the planet carrier (202) of third planet gear (20), first buncher (4) is connected with electrical network (12) or other power supplys by the first power inverter (9), second buncher (5) is connected with electrical network (12) or other power supplys by the second power inverter (10), the transformation of electrical energy of electrical network is that the alternating current of variable voltage variable frequency is powered to the stator winding of the first buncher (4) and the second buncher (5) respectively by the first power inverter (9) and the second power inverter (10), it is characterized in that, described power inverter has holding wire to be connected with between the first buncher (4) and the second buncher (5), in described wind power generation plant, the first buncher (4) is by information such as the rotating speeds of sensor measurement motor (4), the first power inverter (9) is fed back to: first according to the rotating speed determining device mode of operation of wind energy conversion system (11) by holding wire, after mode of operation is determined, part wind energy is delivered to the first buncher (4) by wind energy conversion system (11), first power inverter (9) provides the alternating current of different frequency and voltage to the stator winding of the first buncher (4) according to the information of the first buncher (4) setting speed and feedback rotating speed, control the first buncher (4) generating, feedback grid (12), the setting speed of the second buncher (5) is determined according to mode of operation, second buncher (5) is by the rotating speed of sensor measurement second buncher (5), the second power inverter (10) is fed back to by holding wire, second power inverter (10) provides the alternating current of different frequency and voltage to the stator winding of the second buncher (5) according to the information of the second buncher (5) setting speed and feedback rotating speed, control the second buncher (5) to run according to setting speed, ensure generator (6) working speed of the invariablenes turning speed of the planet carrier (22) of first planet gear (2) in setting.

2. wind power generation plant as claimed in claim 1, it is characterized in that, when the rotating speed of described wind energy conversion system (11) is less than setting speed, mechanical brake (7) closes, clutch (8) is opened, and described wind power generation plant is operated in pattern one state; When the rotating speed of described wind energy conversion system (11) is greater than setting speed, mechanical brake (7) is opened, and clutch (8) closes, and described wind power generation plant is operated in pattern two-state; When the rotating speed of wind energy conversion system (11) equals setting speed, open mechanical brake (7), closed clutch (8), wind power generation plant operating state switches from pattern one to pattern two; Closed mechanical brake (7), open clutch (8), wind power generation plant operating state switches from pattern two to pattern one.