CN111894800A - Wind driven generator rotating speed control method for improving environmental adaptability - Google Patents

Wind driven generator rotating speed control method for improving environmental adaptability Download PDF

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Publication number
CN111894800A
CN111894800A CN202010687104.XA CN202010687104A CN111894800A CN 111894800 A CN111894800 A CN 111894800A CN 202010687104 A CN202010687104 A CN 202010687104A CN 111894800 A CN111894800 A CN 111894800A
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China
Prior art keywords
rotating speed
rated
rated rotating
torque
wind turbine
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CN202010687104.XA
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Chinese (zh)
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CN111894800B (en
Inventor
张硕望
黄凌翔
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XEMC Windpower Co Ltd
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XEMC Windpower Co Ltd
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Priority to CN202010687104.XA priority Critical patent/CN111894800B/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D7/00Controlling wind motors
    • F03D7/02Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/0276Controlling rotor speed, e.g. variable speed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D7/00Controlling wind motors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D7/00Controlling wind motors
    • F03D7/02Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/022Adjusting aerodynamic properties of the blades
    • F03D7/0224Adjusting blade pitch
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D7/00Controlling wind motors
    • F03D7/02Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/04Automatic control; Regulation
    • F03D7/042Automatic control; Regulation by means of an electrical or electronic controller
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D9/00Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
    • F03D9/20Wind motors characterised by the driven apparatus
    • F03D9/25Wind motors characterised by the driven apparatus the apparatus being an electrical generator
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/72Wind turbines with rotation axis in wind direction

Abstract

The invention discloses a wind driven generator rotating speed control method for improving environmental adaptability, which comprises the steps of firstly judging whether a wind driven generator set has a rotating speed switching requirement, if no switching signal exists, the wind driven generator set normally operates, if a switching signal exists, the current working mode of the wind driven generator set is continuously judged, if the wind driven generator set is in a preferred rated rotating speed operation control mode, setting a rated rotating speed to be gradually switched from a preferred rated rotating speed to a transition rotating speed I, and then gradually switched from the transition rotating speed I to a secondary rated rotating speed, and if the wind driven generator set is in a secondary rated rotating speed operation control mode, setting the rated rotating speed to be gradually switched from a secondary rated rotating speed to a transition rotating speed II, and then gradually switched from the. According to the invention, the rated rotating speed of the wind driven generator can be smoothly and gradually changed by adjusting the variable pitch control and the torque control in the running process of the wind driven generator, the rotating speed transition process is smooth and has no jump, and the safety and the environmental adaptability of the unit are improved.

Description

Wind driven generator rotating speed control method for improving environmental adaptability
Technical Field
The invention relates to the field of wind power, in particular to a method for controlling the rotating speed of a wind driven generator, which can improve the environmental adaptability.
Background
At present, a research focus of a large-scale wind turbine generator is to reduce material cost and improve environmental adaptability of a fan. The key to reducing material costs is to reduce the loads on the critical components of the wind turbine to reduce the weight of these critical components and to improve the reliability and life of the equipment. However, due to actual external factors such as wind turbulence, wind shear, tower shadow effect, yaw deviation and the like, the impeller of the large-scale wind turbine generator is obviously affected, and when the design diameter of the wind wheel of the existing fan is increased, the load change is more obvious.
The wind generating set located on a complex terrain has the advantages that the fan is arranged close to a residential area, the site selection in the early stage is limited by the arrangement of the wind measuring tower and various terrains, the integral expected load assessment uncertainty is obviously increased compared with that of a plain wind field, and the influence of noise and the like on residents is also generated.
In the design process of the wind driven generator, the rated rotating speed of the hub is closely related to the operation load of each large component of the fan, and various harmful loads generated by the fan under the action of unknown external disturbance can be remarkably reduced by reducing the rated rotating speed of the hub. In addition, the environmental adaptability of the wind driven generator also comprises environmental friendliness, and the reduction of the rotating speed is implemented to be beneficial to improving the environmental adaptability of the fan to residential areas.
The traditional method for setting the rotating speed of the wind generating set is to select the only generating rated hub rotating speed under the conditions of reserving a certain load safety margin and maintaining the highest efficiency of the generator according to the actual load bearing capacity of the generator and each large component of the set. The design method locks the rated rotating speed of the generator to a determined value singly, and limits the optimization iterative process of the large parts of the large wind turbine generator at present on the design level.
For this reason, some designers have also developed methods for adjusting the rotational speed of the hub of the fan by adjusting the power of the fan. The drawback of this approach is that it ignores the operating characteristics of the generator itself, i.e. does not achieve maximum generator power output at equivalent hub speed levels.
Disclosure of Invention
In order to solve the technical problems, the invention provides a wind driven generator rotating speed control method which is simple in algorithm, safe and reliable and can improve the environmental adaptability.
The technical scheme for solving the problems is as follows: a wind driven generator rotating speed control method for improving environmental adaptability is realized on the basis of a wind driven generator set control system, a control signal is output to adjust parameters of a torque controller and a variable pitch controller of the wind driven generator set control system through a newly added rotating speed switching controller, and the control signal comprises a set reference rated rotating speed, controller parameters and a switching instruction; the rotating speed switching controller bears and executes a rotating speed control method of the wind driven generator;
the method for controlling the rotating speed of the wind driven generator comprises the following steps:
1) setting a preferred rated rotating speed and a secondary rated rotating speed of the wind turbine generator; the rotating speed switching controller receives external input to judge whether the wind generating set has a rotating speed switching requirement, if the wind generating set does not have a switching signal, the step 2) is carried out, and if the wind generating set has the switching signal, the step 3) is carried out;
2) if the rotating speed of the wind turbine generator does not need to be switched, the normal operation is continued by adopting the current pitch and torque control mode and parameters;
3) if the rotating speed of the wind turbine generator needs to be switched, judging the working mode of the current wind turbine generator, if the wind turbine generator is in the preferred rated rotating speed operation control mode, entering the step 4), and if the wind turbine generator is in the secondary rated rotating speed operation control mode, entering the step 9);
4) if the wind turbine generator is in a preferred rated rotating speed operation control mode, when a rotating speed switching command is received, setting a rated rotating speed to be gradually switched from the preferred rated rotating speed to a transition rotating speed I, at the moment, gradually reducing the torque according to a torque curve of the preferred rated rotating speed by the torque controller, and gradually increasing the sensitivity and increasing the paddle angle by the variable pitch controller;
5) judging whether the set rated rotating speed of the wind turbine generator is switched to a transitional rotating speed I, if not, repeating the step 4), and if yes, entering the step 6);
6) when the set rated rotating speed of the wind turbine generator is switched to the transitional rotating speed 1, the set rated rotating speed is gradually switched from the transitional rotating speed I to the secondary rated rotating speed; at the moment, the torque controller gradually increases the torque according to a torque curve of the secondary rated rotating speed, and the variable pitch controller gradually decreases the sensitivity and decreases the pitch angle;
7) judging whether the set rated rotating speed of the wind turbine generator is switched to a secondary rated rotating speed, if not, repeating the step 6), and if yes, entering the step 8);
8) when the set rated rotating speed of the wind turbine generator is equal to the secondary rated rotating speed, the current mode is switched to the secondary rated rotating speed operation control mode, and the switching is completed;
9) if the rotating speed of the wind turbine generator needs to be switched, if the wind turbine generator is in a secondary rated rotating speed operation control mode, when a rotating speed switching command is received, setting the rated rotating speed to be gradually switched from the secondary rated rotating speed to a transition rotating speed II; at the moment, the torque controller gradually reduces the torque according to a torque curve of the secondary rated rotating speed, and the variable pitch controller gradually increases the sensitivity and increases the pitch angle;
10) judging whether the set rated rotating speed of the wind turbine generator is switched to a transition rotating speed II, if not, repeating the step 9), and if yes, entering the step 11);
11) when the set rated rotating speed of the wind turbine generator is switched to a transition rotating speed II, the set rated rotating speed is gradually switched from the transition rotating speed II to a preferred rated rotating speed; at the moment, the torque controller gradually increases the torque according to a torque curve of the preferred rated rotating speed, and the variable pitch controller gradually decreases the sensitivity and decreases the pitch angle;
12) judging whether the set rated rotating speed of the wind turbine generator is switched to the preferred rated rotating speed, if not, repeating the step 11), and if yes, entering the step 13);
13) and when the set rated rotating speed of the wind turbine generator is equal to the preferred rated rotating speed, switching the current mode to the preferred rated rotating speed operation control mode, and finishing the switching.
According to the wind driven generator rotating speed control method for improving the environmental adaptability, the highest torque corresponding to the secondary rated rotating speed in the secondary rated rotating speed torque curve is higher than the corresponding value in the preferred rated rotating speed torque curve.
According to the wind driven generator rotating speed control method for improving the environmental adaptability, when the variable pitch controller executes rotating speed switching, a plurality of groups of rotating speed torque curves are used for constraint, and the sensitivity adjustment of the variable pitch controller is realized by adjusting the control parameters of the variable pitch link.
According to the wind driven generator rotating speed control method for improving the environmental adaptability, a plurality of transitional rotating speeds and secondary rated rotating speeds exist, the switching mode is that a higher rotating speed is set as a preferred rated rotating speed, and a lower rotating speed is set as the secondary rated rotating speed and then is executed according to the existing logic.
The invention has the beneficial effects that:
1. in the normal power generation operation process of the wind driven generator, the invention breaks through the traditional unique hub rated rotating speed mode, can change the rated rotating speed under the control of a certain external enabling signal, does not need to stop the wind driven generator and is more convenient to operate.
2. According to the invention, the rated rotating speed of the wind driven generator can be smoothly and gradually changed by adjusting the variable pitch control and the torque control in the running process of the wind driven generator, the whole switching process is ensured not to increase sudden load fluctuation in the switching process, the rotating speed transition process is smooth and has no jump, the service life of a unit system is rapidly prolonged, and the safety and the environmental adaptability of the unit are improved.
3. When the wind generating set operates in the secondary rated rotating speed mode, the invention can ensure that the set reaches the maximum output power at the rotating speed under the condition of operating the fan component at the set rotating speed.
Drawings
FIG. 1 is a block diagram of a wind turbine control system according to the present invention.
Fig. 2 is a graph of speed-torque control in the control method of the present invention.
FIG. 3 is a flow chart of the control method of the present invention.
FIG. 4 is a timing diagram of the rotation speed in the control method of the present invention.
FIG. 5 is a graph showing the comparative effect of the control method of the present invention compared with the conventional method.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, a wind power generator control system includes a torque controller, a pitch controller, and a rotation speed switching controller, wherein the torque controller is connected to a wind power generator set, the pitch controller is connected to the wind power generator set, and the rotation speed switching controller is connected to the wind power generator set, the torque controller, and the pitch controller.
The wind generating set receives a torque command torque given signal of the torque controller and a PitchAngleDecommand signal of the pitch controller, and guides the action of the actuating mechanism according to the signals. The wind generating set simultaneously outputs Torque, RotorSpeed hub rotating speed and PitchAngle blade angle signals to the Torque controller, the pitch controller and the rotating speed switching controller. In addition, the rotation speed switching controller also receives an external rotation speed switching enable signal ExSignal. The rotating speed switching controller adjusts parameters of the torque controller and the pitch controller by outputting a ControlSignals control signal, wherein the control signal includes but is not limited to setting reference rated rotating speed, controller parameters and switching instructions.
And when the variable pitch controller executes the rotation speed switching, the torque control curves corresponding to a plurality of groups of rated rotation speeds are used for constraint, and the sensitivity condition of the variable pitch controller is realized by adjusting the control parameters of a variable pitch link. The following description will take the switching process of two sets of rated rotational speeds as an example.
As shown in fig. 2, the rotation speed control curve of the torque controller is divided into Normal curve and LowRated curve. Wherein the Normal curve is a preferred rated rotating speed torque curve, and the LowRated curve is a secondary rated rotating speed torque curve. And the highest corresponding torque of the secondary rated rotating speed in the LowRated curved secondary rated rotating speed torque curve is higher than the corresponding value in the Normal curved primary rated rotating speed torque curve, namely the torque corresponding to SR2 in FIG. 2 is higher than the torque corresponding to ST 1. The preferred rated speed and torque curve and the secondary rated speed and torque curve are allowed to be overlapped in a partial speed range. The change in torque control value from each rotational speed state point to the other rotational speed state points is defined by the direction of the arrow.
As shown in fig. 3, a method for controlling the rotation speed of a wind turbine includes the following steps:
1) setting a preferred rated rotating speed and a secondary rated rotating speed of the wind turbine generator; the rotating speed switching controller receives external input to judge whether the wind generating set has a rotating speed switching requirement, if the wind generating set does not have a switching signal, the step 2) is carried out, and if the wind generating set has the switching signal, the step 3) is carried out;
2) if the rotating speed of the wind turbine generator does not need to be switched, the normal operation is continued by adopting the current pitch and torque control mode and parameters;
3) if the rotating speed of the wind turbine generator needs to be switched, judging the working mode of the current wind turbine generator, if the wind turbine generator is in the preferred rated rotating speed operation control mode, entering the step 4), and if the wind turbine generator is in the secondary rated rotating speed operation control mode, entering the step 9);
4) if the wind turbine generator is in a preferred rated rotating speed operation control mode, when a rotating speed switching command is received, setting a rated rotating speed to be gradually switched from the preferred rated rotating speed to a transition rotating speed I, at the moment, gradually reducing the torque according to a torque curve of the preferred rated rotating speed by the torque controller, and gradually increasing the sensitivity and increasing the paddle angle by the variable pitch controller;
5) judging whether the set rated rotating speed of the wind turbine generator is switched to a transitional rotating speed I, if not, repeating the step 4), and if yes, entering the step 6);
6) when the set rated rotating speed of the wind turbine generator is switched to the transitional rotating speed 1, the set rated rotating speed is gradually switched from the transitional rotating speed I to the secondary rated rotating speed; at the moment, the torque controller gradually increases the torque according to a torque curve of the secondary rated rotating speed, and the variable pitch controller gradually decreases the sensitivity and decreases the pitch angle;
7) judging whether the set rated rotating speed of the wind turbine generator is switched to a secondary rated rotating speed, if not, repeating the step 6), and if yes, entering the step 8);
8) when the set rated rotating speed of the wind turbine generator is equal to the secondary rated rotating speed, the current mode is switched to the secondary rated rotating speed operation control mode, and the switching is completed;
9) if the rotating speed of the wind turbine generator needs to be switched, if the wind turbine generator is in a secondary rated rotating speed operation control mode, when a rotating speed switching command is received, setting the rated rotating speed to be gradually switched from the secondary rated rotating speed to a transition rotating speed II; at the moment, the torque controller gradually reduces the torque according to a torque curve of the secondary rated rotating speed, and the variable pitch controller gradually increases the sensitivity and increases the pitch angle;
10) judging whether the set rated rotating speed of the wind turbine generator is switched to a transition rotating speed II, if not, repeating the step 9), and if yes, entering the step 11);
11) when the set rated rotating speed of the wind turbine generator is switched to a transition rotating speed II, the set rated rotating speed is gradually switched from the transition rotating speed II to a preferred rated rotating speed; at the moment, the torque controller gradually increases the torque according to a torque curve of the preferred rated rotating speed, and the variable pitch controller gradually decreases the sensitivity and decreases the pitch angle;
12) judging whether the set rated rotating speed of the wind turbine generator is switched to the preferred rated rotating speed, if not, repeating the step 11), and if yes, entering the step 13);
13) and when the set rated rotating speed of the wind turbine generator is equal to the preferred rated rotating speed, switching the current mode to the preferred rated rotating speed operation control mode, and finishing the switching.
The transition rotating speed and the secondary rated rotating speed are multiple, the switching mode is that the higher rotating speed is set as the preferred rated rotating speed, and the lower rotating speed is set as the secondary rated rotating speed and then is executed according to the existing logic.
Fig. 4 and 5 show the variation trend of the rotating speed and the power of the wind generating set in the rotating speed switching process. It can be found from the rotation speed sequence diagram of the wind turbine generator set in the rated rotation speed control process in fig. 4 that the hub rotation speed control is smooth and has no sudden change. Meanwhile, through the output power ratio effect diagram of the control method of the application in comparison with the traditional control mode in fig. 5, it is clear that the power output of the generator of the wind power large motor can be obviously improved in the operation process of the application at a lower rated rotating speed in comparison with the traditional mode.

Claims (4)

1. A wind driven generator rotating speed control method for improving environmental adaptability is realized on the basis of a wind driven generator set control system, a control signal is output to adjust parameters of a torque controller and a variable pitch controller of the wind driven generator set control system through a newly added rotating speed switching controller, and the control signal comprises a set reference rated rotating speed, controller parameters and a switching instruction; the rotating speed switching controller bears and executes a rotating speed control method of the wind driven generator;
the method for controlling the rotating speed of the wind driven generator comprises the following steps:
1) setting a preferred rated rotating speed and a secondary rated rotating speed of the wind turbine generator; the rotating speed switching controller receives external input to judge whether the wind generating set has a rotating speed switching requirement, if the wind generating set does not have a switching signal, the step 2) is carried out, and if the wind generating set has the switching signal, the step 3) is carried out;
2) if the rotating speed of the wind turbine generator does not need to be switched, the normal operation is continued by adopting the current pitch and torque control mode and parameters;
3) if the rotating speed of the wind turbine generator needs to be switched, judging the working mode of the current wind turbine generator, if the wind turbine generator is in the preferred rated rotating speed operation control mode, entering the step 4), and if the wind turbine generator is in the secondary rated rotating speed operation control mode, entering the step 9);
4) if the wind turbine generator is in a preferred rated rotating speed operation control mode, when a rotating speed switching command is received, setting a rated rotating speed to be gradually switched from the preferred rated rotating speed to a transition rotating speed I, at the moment, gradually reducing the torque according to a torque curve of the preferred rated rotating speed by the torque controller, and gradually increasing the sensitivity and increasing the paddle angle by the variable pitch controller;
5) judging whether the set rated rotating speed of the wind turbine generator is switched to a transitional rotating speed I, if not, repeating the step 4), and if yes, entering the step 6);
6) when the set rated rotating speed of the wind turbine generator is switched to the transitional rotating speed 1, the set rated rotating speed is gradually switched from the transitional rotating speed I to the secondary rated rotating speed; at the moment, the torque controller gradually increases the torque according to a torque curve of the secondary rated rotating speed, and the variable pitch controller gradually decreases the sensitivity and decreases the pitch angle;
7) judging whether the set rated rotating speed of the wind turbine generator is switched to a secondary rated rotating speed, if not, repeating the step 6), and if yes, entering the step 8);
8) when the set rated rotating speed of the wind turbine generator is equal to the secondary rated rotating speed, the current mode is switched to the secondary rated rotating speed operation control mode, and the switching is completed;
9) if the rotating speed of the wind turbine generator needs to be switched, if the wind turbine generator is in a secondary rated rotating speed operation control mode, when a rotating speed switching command is received, setting the rated rotating speed to be gradually switched from the secondary rated rotating speed to a transition rotating speed II; at the moment, the torque controller gradually reduces the torque according to a torque curve of the secondary rated rotating speed, and the variable pitch controller gradually increases the sensitivity and increases the pitch angle;
10) judging whether the set rated rotating speed of the wind turbine generator is switched to a transition rotating speed II, if not, repeating the step 9), and if yes, entering the step 11);
11) when the set rated rotating speed of the wind turbine generator is switched to a transition rotating speed II, the set rated rotating speed is gradually switched from the transition rotating speed II to a preferred rated rotating speed; at the moment, the torque controller gradually increases the torque according to a torque curve of the preferred rated rotating speed, and the variable pitch controller gradually decreases the sensitivity and decreases the pitch angle;
12) judging whether the set rated rotating speed of the wind turbine generator is switched to the preferred rated rotating speed, if not, repeating the step 11), and if yes, entering the step 13);
13) and when the set rated rotating speed of the wind turbine generator is equal to the preferred rated rotating speed, switching the current mode to the preferred rated rotating speed operation control mode, and finishing the switching.
2. The method for controlling the rotating speed of the wind driven generator according to claim 1, wherein: the highest torque corresponding to the secondary rated speed in the secondary rated speed torque curve is higher than the corresponding value in the preferred rated speed torque curve.
3. The method for controlling the rotating speed of the wind driven generator according to claim 1, wherein: when the variable pitch controller executes rotating speed switching, a plurality of groups of rotating speed torque curves are used for carrying out constraint, and the sensitivity adjustment of the variable pitch controller is realized by adjusting the control parameters of a variable pitch link.
4. The method for controlling the rotating speed of the wind driven generator according to claim 1, wherein: the transition rotating speed and the secondary rated rotating speed are multiple, the switching mode is that the higher rotating speed is set as the preferred rated rotating speed, and the lower rotating speed is set as the secondary rated rotating speed and then is executed according to the existing logic.
CN202010687104.XA 2020-07-16 Wind driven generator rotating speed control method for improving environmental adaptability Active CN111894800B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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