CN113389859A - Wind generating set prediction type constant speed box system and constant speed control method - Google Patents
Wind generating set prediction type constant speed box system and constant speed control method Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
- F16H3/70—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D15/00—Transmission of mechanical power
- F03D15/10—Transmission of mechanical power using gearing not limited to rotary motion, e.g. with oscillating or reciprocating members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/04—Automatic control; Regulation
- F03D7/041—Automatic control; Regulation by means of a mechanical governor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention discloses a prediction type constant speed box system of a wind generating set and a constant speed control method, wherein the system comprises a planetary gear train, a control gear, a power source, an anemometer and a controller, wherein the outer circumference of a gear ring in the planetary gear train is set as a gear surface to be meshed with the control gear, a planetary carrier and a sun gear of the planetary gear train are respectively fixedly connected with a wind wheel shaft and a generator main shaft of the wind generating set, the power source is in transmission connection with the control gear, the controller is in control connection with the power source, the anemometer is arranged in the working environment of the wind generating set, and the anemometer is in signal transmission connection with the controller. The method of the invention obtains the rotating speed of the wind wheel shaft by the controller according to the data prediction of the anemometer, and then controls the rotating speed of the control gear through the power source to keep the rotating speed of the main shaft of the generator constant as a set target value. When the external conditions change, the invention can obtain more stable output results through active control, and better utilize wind energy to generate power.
Description
Technical Field
The invention relates to the field of constant speed control systems of wind generating sets, in particular to a prediction type constant speed box system of a wind generating set and a constant speed control method.
Background
When the wind generating set generates electricity, wind drives the impeller to rotate to form mechanical torque, then the mechanical torque is accelerated to the rotating speed required by the main shaft of the asynchronous generator through the main shaft transmission chain and the gear box, and electricity is generated through the generator. The conventional gearbox is in a fixed speed ratio, so that when the wind speed changes, the rotating speed of the impeller changes, the rotating speed of the main shaft of the generator after the gearbox is accelerated changes, the frequency of electric energy generated by the generator fluctuates, the generated electric energy is reduced or the actual application value is directly lost, and the electric energy can only be used independently and is difficult to be merged into a main-flow power grid.
The existing wind generating set adopts a gear box mechanism with a fixed speed ratio to accelerate the rotating speed of an impeller, and the prior art adopts a certain speed regulating mechanism to solve the problem of speed change of a main shaft of a generator caused by the change of wind speed so as to control the output stability of the generator. However, these speed adjusting structures are not directed to the gear box portion of the transmission system, but adjust the direction of the impeller or change the angle of the fan blades or change the pitch of the fan blades, etc. By adopting the solving measures, the complexity of a mechanical structure is increased, the strength of key components such as an impeller of the generator set and the like is also influenced, the failure probability is increased, the maintenance is more difficult, and meanwhile, the utilization efficiency of wind energy is also reduced.
Disclosure of Invention
The invention aims to provide a wind generating set prediction type constant speed box system and a constant speed control method, and aims to solve the problem that the frequency of output electric energy is unstable when the wind speed of a wind generating set in the prior art changes.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a wind generating set prediction type constant speed case system which characterized in that: the wind driven generator set wind speed measurement device comprises a planetary gear train, a control gear, a power source, an anemometer and a controller, wherein the planetary gear train comprises a gear ring, a sun gear, a planet gear and a planet carrier, the outer circumference of the gear ring is set as a gear surface, the planet carrier of the planetary gear train is fixedly connected with a wind wheel shaft of a wind driven generator set, the sun gear of the planetary gear train is fixedly connected with a generator main shaft of the wind driven generator set, the control gear is meshed with the gear surface of the outer circumference of the gear ring in the planetary gear train, the power source is in transmission connection with the control gear, the controller is in control connection with the power source, the anemometer is arranged in the working environment of the wind driven generator set, the anemometer is in signal transmission connection with the controller, and the anemometer collects the wind speed data of the working environment of the wind driven generator set and transmits the wind speed data to the controller.
The wind generating set prediction type constant speed box system is characterized in that: the controller is electrically connected with a wind wheel rotating speed sensor, the wind wheel rotating speed sensor is matched with a wind wheel shaft of the wind generating set in a working mode, the wind wheel rotating speed sensor senses the rotating speed of the wind wheel shaft of the wind generating set and sends rotating speed data to the controller.
The wind generating set prediction type constant speed box system is characterized in that: the controller is electrically connected with a main shaft rotating speed sensor, the main shaft rotating speed sensor is matched with a generator main shaft of the wind generating set in a working mode, the main shaft rotating speed sensor senses the actual rotating speed of the generator main shaft in the wind generating set and sends rotating speed data to the controller.
A wind generating set constant speed control method based on a prediction type constant speed box system is characterized by comprising the following steps: and predicting to obtain the variable quantity of the rotating speed of the wind wheel shaft in the wind generating set at the current wind speed by the controller according to the wind speed data measured by the anemometer, and controlling the rotating speed of the control gear by a power source by combining the gear ratio of the gear ring and the sun gear and the gear ratio of the gear ring and the control gear so as to control the rotating speed of the gear ring and keep the rotating speed of a main shaft of a generator in the wind generating set constant at a set target value.
The constant speed control method of the wind generating set is characterized in that: the controller controls the rotating speed of the control gear based on a control formula, so that the rotating speed of a main shaft of a generator in the wind generating set is kept constant at a set target value, and the control formula is as follows:
n4＝b((1+a)(n3+Δn3)-n1)/a，
wherein: a is the gear ratio of a gear ring and a sun gear in the planetary gear train; b is the gear ratio of the gear ring to the control gear;
n1the rotation speed of the sun gear in the planetary gear train is n because the sun gear is fixedly connected with the main shaft of the generator of the wind generating set1Namely, a set target value which is required to be kept constant for a generator main shaft of the wind generating set;
n3the current rotating speed of the planet carrier in the planetary gear train is n because the planet carrier is fixedly connected with a wind wheel shaft of the wind generating set3Namely the rotating speed of the wind wheel shaft in the wind generating set measured by the wind wheel rotating speed sensor;
Δn3the variable quantity of the rotating speed of the planet carrier is delta n because the planet carrier is fixedly connected with the wind wheel shaft of the wind generating set3Namely the variable quantity delta n of the rotating speed of the wind wheel shaft predicted by the controller according to the measured data of the anemometer3The initial value is 0;
n4to control the controlled rotational speed of the gear.
The constant speed control method of the wind generating set is characterized in that: the controller obtains the actual rotating speed of the main shaft of the generator in the wind generating set, which is obtained by the sensing of the main shaft rotating speed sensor, and obtains a correction coefficient by combining a set target value that the rotating speed of the main shaft of the generator in the wind generating set needs to be kept constant, and then the controlled rotating speed of the control gear is corrected through the correction coefficient, so that the rotating speed of the main shaft of the generator in the wind generating set is kept constant at the set target value.
The constant speed control method of the wind generating set is characterized in that: and c, when the actual rotating speed of the main shaft of the generator is greater than a set target value required to be kept constant, correcting the controlled rotating speed of the control gear into: (1+ c) correcting the controlled speed of the front control gear;
when the actual rotating speed of the main shaft of the generator is less than a set target value required to be kept constant, the controlled rotating speed of the control gear is corrected to be as follows: (1-c) correcting the controlled speed of the front control gear.
Aiming at the objective environment that the wind speed is not controlled in the working environment of the wind generating set, the system constructs a transmission mechanism between a wind wheel shaft and a main shaft of the generating set through a planetary gear train, and simultaneously constructs a control gear for controlling the speed of a gear ring in the planetary gear train, thereby achieving the purpose of controlling the rotating speed of the main shaft of the generating set. The method of the invention utilizes an anemometer to measure the ambient wind speed for predicting wind speed data of a wind wheel shaft, predicts and obtains the rotating speed which can be reached by the wind wheel shaft under the current wind speed according to the wind speed data measured by the anemometer, and realizes the control of a planetary gear train through a control gear according to the predicted rotating speed of the wind wheel shaft, thereby realizing the purpose of keeping the rotating speed of a main shaft of a generator constant at a set target value. Through the mode, the electric energy output of the generator with stable frequency is finally obtained.
Compared with the prior art, the invention has the advantages that:
when the wind speed changes, the invention can lead the main shaft of the generator set to output stable rotating speed, and lead the generator set to output electric energy with stable frequency. The invention does not need to change the integrity of the impeller or adjust or change the deviation of the impeller, the installation angle of the fan blade or the pitch, and the like, thereby reducing the complexity of the wind generating set, increasing the reliability and improving the utilization efficiency of the wind energy.
The invention simplifies the mechanical structure of the wind generating set, can actively respond to the change of the external condition faster by applying the electronic control technology, can obtain a more stable output result by active control when the external condition changes, and better utilizes the wind energy to generate power.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention;
FIG. 2 is a schematic diagram of the construction of the carrier portion of the planetary gear set in the system of the present invention;
fig. 3 is a flow chart of the method of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1 and fig. 2, the wind driven generator predictive constant speed box system of the present invention is composed of a gear box device and an electronic control system, wherein the gear box device comprises a planetary gear train composed of a sun gear 4, a planetary gear 5, a planet carrier 6 and a gear ring 7, and a wind wheel shaft 1, a control gear 8 and a generator main shaft 13.
In the invention, the planetary gear train is a four-element planetary gear train with an indefinite transmission ratio, which is composed of a sun gear 4, a planet carrier 6, a gear ring 7 and a control gear 8, wherein the sun gear 4, the planet carrier 6 and the gear ring 7 in the planetary gear train can all rotate. The wind wheel shaft 1 and the planet carrier 6 of the wind generating set are coaxially and fixedly connected on a rotating axis, or the wind wheel shaft 1 is fixedly connected with the non-central position of the planet carrier 6 through a connecting piece. The wind generating set finds the generator main shaft 12 and the sun gear 4 to be coaxially and fixedly connected on the rotating axis.
In the planetary gear train, the ring gear 7 is provided with a gear surface on the outer circumference of the ring gear 7 in addition to gears required for the planetary gear train, and the control gear 8 is engaged with the gear surface on the outer circumference of the ring gear 7.
The electronic control system is composed of a wind wheel shaft gear ring 2, a wind wheel rotating speed sensor 3, a power source 9, a controller 10, a main shaft rotating speed sensor 11, a generator main shaft gear ring 13 and an anemometer 14. The power source 9 is an electric motor, a hydraulic motor, a pneumatic motor, or another mechanism capable of driving a target component to rotate, an output shaft of the power source 9 is fixedly connected to the control gear 8, specifically, the control gear 8 is coaxially fixed to the output shaft of the power source 9, or the output shaft of the power source 9 is connected to the control gear 8 through another transmission mechanism, in this embodiment, the power source 9 is taken as an example of an electric motor. The wind wheel shaft gear ring 2 rotates synchronously with the wind wheel shaft 1, the wind wheel rotating speed sensor 3 is arranged on the edge of the wind wheel shaft gear ring 2, the generator main shaft gear ring 13 rotates synchronously with the generator main shaft, and the main shaft rotating speed sensor 11 is arranged on the edge of the generator main shaft gear ring 13. The anemometer 14 is a vane anemometer, the anemometer 14 is disposed in a working environment of the wind turbine generator set, and an impeller of the anemometer 14 is installed in parallel with an impeller of the wind turbine generator set for sensing a wind speed signal. The wind wheel rotating speed sensor 3, the main shaft rotating speed sensor 11, the anemometer 14 and the power source 9 are electrically connected with the controller 10 through leads, the controller 10 receives data respectively collected by the wind wheel rotating speed sensor 3, the main shaft rotating speed sensor 11 and the anemometer 14, the controller 10 controls the rotating speed of the power source 9, and therefore the rotating speed of the control gear 8 is controlled.
In application, an impeller is connected to a wind wheel shaft 1, a generator main shaft 12 is connected to a generator main body, and the whole body is arranged on a support of a wind generating set. Before the work is not started, the power source 9 does not act, the control gear 8 does not rotate, the gear ring 7 is fixed at the moment, and the planetary gear train has an initial transmission ratio according to the gear parameters of the planetary gear train. When the wind blowing impeller rotates to a certain speed, the generator main shaft 12 is accelerated to a preset rotating speed through transmission, the whole system starts to work, and the speed value of the corresponding anemometer 14 is set, when the planetary gear train is in an initial transmission ratio, the generator main shaft 12 stably rotates.
Fig. 3 is a control flow chart of the constant speed control method of the wind generating set according to the invention. When the wind speed changes, the speed of the anemometer 14 and the wind wheel changes, but the rotational inertia of the anemometer 14 is far smaller than that of the wind wheel, so that the rotating speed of the anemometer 14 can change faster than that of the wind wheel, and the wind speed can be sensed more accurately. An anemometer 14 transmits a wind speed signal to a controller 10 through a lead, the controller 10 calculates the rotating speed of a wind wheel according to the rotational inertia of an impeller, then calculates the rotating speed of a gear ring 7 according to the inherent rule of the rotating speeds among three elements determined by the set parameters of a sun gear 4, a planet carrier 6 and the gear ring 7 under the condition that the sun gear 4 rotates along with a generator main shaft 12 according to the set rotating speed, and drives a power source 9 through the lead to drive a control gear 8 to rotate, the control gear 8 drives the gear ring 7 to rotate immediately, the planet gear train is enabled to obtain a transmission ratio under the current condition in advance, and the rotating speed of the generator main shaft 12 is ensured to be consistent with the rotating speed of a generator main shaft gear ring 13.
The wind wheel rotation speed sensor 3 induces the actual rotation speed of the wind wheel through the wind wheel shaft gear ring 2 on the wind wheel shaft 1, and the actual signal of the main shaft rotation speed induced by the main shaft rotation speed sensor 11 through the generator main shaft gear ring 13 on the generator main shaft 12 is also fed back to the controller 10, and the controller 10 drives the control gear 8 to correct the rotation speed of the gear ring 7 through the control power source 9.
By continuously controlling the speed of the control gear 8, the invention can keep the rotating speed of the main shaft 12 of the generator at a constant speed, and the output of the generator is the electric energy with constant frequency.
According to the invention, firstly, the rotating speed change of the impeller of the wind generating set can be predicted according to the rotating speed change of the anemometer through the rotating speed relation between the wind wheel of the wind generating set and the impeller of the anemometer under the same wind power condition, and then the corresponding rotating speed of the gear ring 7 is calculated according to the internal rule of the gear box device.
Setting the rotational inertia of a wind wheel of a wind generating set to J1N is the number of revolutions of the carrier 6 which coincides with the number of revolutions thereof3The speed variation over time Δ t is Δ n3Effective area of wind power is S1Then, under the effect of wind pressure p, the relation among each parameter has:
J1Δn3/Δt＝p S1，
also, the moment of inertia of the anemometer impeller is set to J5With a rotational speed of n5The speed variation over time Δ t is Δ n5Effective area of wind power is S5Under the same wind pressure p, the relationship among the parameters is as follows:
J5Δn5/Δt＝p S5，
the above two formulas eliminate Δ t and p and can be obtained by arrangement:
Δn3＝(J5/J1)(S1/S5)Δn5。
therefore, the speed variation Δ n of the impeller is measured by the anemometer 145The rotating speed delta n of the wind outlet wheel shaft 1 can be predicted3The amount of change.
In one control cycle, the sum of the current speed and the variable quantity of the wind wheel shaft 1 is reassigned to the speed n of the wind wheel shaft 13So that the method can perform specific calculation in the control process, namely:
n3＝n3+Δn3。
referring to fig. 2, a gear box assembly of the predictive constant speed box system and the control method of the wind driven generator of the present inventionSetting the rotation speed of the sun gear 4 to n1The rotation speed of the ring gear 7 is n2The rotational speed of the planet carrier 6 is n3The rotational speed of the control gear 8 is n4The gear ratio of the ring gear 7 to the sun gear 4 is a and the gear ratio of the ring gear 7 to the control gear 8 is b, wherein the rotational speed n of the sun gear 4 is1The rotating speed of the generator main shaft 12 is consistent, the value is constant in the application of the wind generating set, and the rotating speed can be measured by a main shaft rotating speed sensor 11; rotational speed n of the planet carrier 63The input quantity is consistent with the wind wheel shaft 1 and can be measured by a wind wheel rotating speed sensor 3; rotational speed n of the ring gear 72Is a controlled quantity; controlling the speed n of the gear 84Is a control amount obtained by controlling the power source 9 by the controller 10. The inherent law of the planetary gear train can be obtained as follows:
n1+a n2-(1+a)n3＝0，
at a speed n of the sun gear 41For a known set value, the rotational speed n of the planet carrier 63Under the condition of rotating along with the wind wheel, the rotating speed n of the gear ring 7 can be calculated2：
n2＝((1+a)n3-n1)/a，
In order to obtain the speed n of the ring gear 72From the meshing relationship between the ring gear 7 and the control gear 8, the controller 10 can calculate the rotation speed n of the control gear 84：
n4＝b n2＝b((1+a)n3-n1)/a，
In practical application, the rotating speed n of the planet carrier 63There will be a predicted variation Δ n3And the amount of change should also be taken into account, the controller 10 calculates the rotational speed n of the control gear 84Should be modified to:
n4＝b n2＝b((1+a)(n3+Δn3)-n1)/a，
the control method of the invention is then implemented by operating the power source 9 at the derived rotational speed.
The invention relates to a prediction type constant speed box system of a wind generating set, which is used for obtaining the rotating speed n of a main shaft 12 of a generator through calculation in the actual operation1Possibly deviating from the set value, the controller 10 is turned onThe overpower source 9 corrects the rotation speed n of the control gear 84To proceed with. Setting the speed n of the control gear 84C when the main shaft 12 of the generator rotates at a speed n1Above the set value, the controller 10 corrects the actual rotational speed of the control gear 8 to (1+ c) n4(ii) a When the main shaft 12 of the generator rotates at a speed n1When the actual rotational speed is lower than the set value, the controller 10 corrects the actual rotational speed of the control gear 8 to (1-c) n4. In the operation of the passive constant speed box system of the wind generating set, the controller 10 can continuously correct the rotating speed of the control gear 8, thereby ensuring that the output rotating speed of the constant speed box can be stabilized at a set value under the condition that different wind speeds act on the wind wheel.
The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, and the technical content of the present invention which is claimed is fully set forth in the claims.
Claims (7)
1. The utility model provides a wind generating set prediction type constant speed case system which characterized in that: the wind driven generator set wind speed measurement device comprises a planetary gear train, a control gear, a power source, an anemometer and a controller, wherein the planetary gear train comprises a gear ring, a sun gear, a planet gear and a planet carrier, the outer circumference of the gear ring is set as a gear surface, the planet carrier of the planetary gear train is fixedly connected with a wind wheel shaft of a wind driven generator set, the sun gear of the planetary gear train is fixedly connected with a generator main shaft of the wind driven generator set, the control gear is meshed with the gear surface of the outer circumference of the gear ring in the planetary gear train, the power source is in transmission connection with the control gear, the controller is in control connection with the power source, the anemometer is arranged in the working environment of the wind driven generator set, the anemometer is in signal transmission connection with the controller, and the anemometer collects the wind speed data of the working environment of the wind driven generator set and transmits the wind speed data to the controller.
2. The wind generating set predictive constant velocity box system according to claim 1, wherein: the controller is electrically connected with a wind wheel rotating speed sensor, the wind wheel rotating speed sensor is matched with a wind wheel shaft of the wind generating set in a working mode, the wind wheel rotating speed sensor senses the rotating speed of the wind wheel shaft of the wind generating set and sends rotating speed data to the controller.
3. The wind generating set predictive constant velocity box system according to claim 1, wherein: the controller is electrically connected with a main shaft rotating speed sensor, the main shaft rotating speed sensor is matched with a generator main shaft of the wind generating set in a working mode, the main shaft rotating speed sensor senses the actual rotating speed of the generator main shaft in the wind generating set and sends rotating speed data to the controller.
4. A constant speed control method of a wind generating set based on a predictive constant speed box system according to any one of claims 1 to 3, characterized in that: and predicting to obtain the variable quantity of the rotating speed of the wind wheel shaft in the wind generating set at the current wind speed by the controller according to the wind speed data measured by the anemometer, and controlling the rotating speed of the control gear by a power source by combining the gear ratio of the gear ring and the sun gear and the gear ratio of the gear ring and the control gear so as to control the rotating speed of the gear ring and keep the rotating speed of a main shaft of a generator in the wind generating set constant at a set target value.
5. The constant speed control method of a wind turbine generator set according to claim 4, characterized in that: the controller controls the rotating speed of the control gear based on a control formula, so that the rotating speed of a main shaft of a generator in the wind generating set is kept constant at a set target value, and the control formula is as follows:
n4＝b((1+a)(n3+Δn3)-n1)/a，
wherein: a is the gear ratio of a gear ring and a sun gear in the planetary gear train; b is the gear ratio of the gear ring to the control gear;
n1the rotation speed of the sun gear in the planetary gear train is n because the sun gear is fixedly connected with the main shaft of the generator of the wind generating set1Namely, a set target value which is required to be kept constant for a generator main shaft of the wind generating set;
n3the current rotating speed of the planet carrier in the planetary gear train is n because the planet carrier is fixedly connected with a wind wheel shaft of the wind generating set3Namely the rotating speed of the wind wheel shaft in the wind generating set measured by the wind wheel rotating speed sensor;
Δn3the variable quantity of the rotating speed of the planet carrier is delta n because the planet carrier is fixedly connected with the wind wheel shaft of the wind generating set3Namely the variable quantity delta n of the rotating speed of the wind wheel shaft predicted by the controller according to the measured data of the anemometer3The initial value is 0;
n4to control the controlled rotational speed of the gear.
6. The constant speed control method of a wind turbine generator set according to claim 4, characterized in that: the controller obtains the actual rotating speed of the main shaft of the generator in the wind generating set, which is obtained by the sensing of the main shaft rotating speed sensor, and obtains a correction coefficient by combining a set target value that the rotating speed of the main shaft of the generator in the wind generating set needs to be kept constant, and then the controlled rotating speed of the control gear is corrected through the correction coefficient, so that the rotating speed of the main shaft of the generator in the wind generating set is kept constant at the set target value.
7. The constant speed control method of a wind turbine generator set according to claim 6, characterized in that: and c, when the actual rotating speed of the main shaft of the generator is greater than a set target value required to be kept constant, correcting the controlled rotating speed of the control gear into: (1+ c) correcting the controlled speed of the front control gear;
when the actual rotating speed of the main shaft of the generator is less than a set target value required to be kept constant, the controlled rotating speed of the control gear is corrected to be as follows: (1-c) correcting the controlled speed of the front control gear.
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