CN105134489A - Start control system and method of wind generating unit - Google Patents
Start control system and method of wind generating unit Download PDFInfo
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- CN105134489A CN105134489A CN201510613718.2A CN201510613718A CN105134489A CN 105134489 A CN105134489 A CN 105134489A CN 201510613718 A CN201510613718 A CN 201510613718A CN 105134489 A CN105134489 A CN 105134489A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention relates to a start control system and method of a wind generating unit. The real-time wind speed of the environment in which the wind generating unit works and the real-time rotating speed of a generator shaft are monitored in real time, so that a target pitch angle of blades is determined, a pitch angle of the blades is adjusted to the target pitch angle, the start torque of the blades can be increased, a wind wheel is driven to accelerate to reach paralleling rotating speed, and electric generation is started. Due to the fact that the target pitch angle is determined in real time according to the real-time external environment and the state of the wind generating unit and continuously adjusted, the wind generating unit can adapt to environment changes and self-state changes and can react rapidly in time. Particularly, when the wind speed of the environment in which the wind generating unit works is low and the rotating speed of the blades cannot reach rotating speed needed by paralleling electric generation, the pitch angle of the blades is adjusted to the target pitch angle, the start torque of the blades is increased, the start wind speed of the wind generating unit is lowered, then, the electric generating efficiency of the wind generating unit at the low wind speed is improved, and the manufacturing cost and energy consumption of the unit are not increased.
Description
Technical field
The present invention relates to power domain, particularly a kind of startup control system of wind power generating set and method.
Background technique
Along with the continuous increase of installed capacity of wind-driven power, high-quality wind-resources is fewer and feweri, and improve the generating efficiency of wind power generating set, the generating efficiency under especially low wind friction velocity seems particularly important.At present, for improving the generating efficiency under the low wind friction velocity of wind power generating set, make full use of wind energy, one of effective method reduces the threshold wind velocity of wind power generating set.
The method reducing the threshold wind velocity of wind power generating set roughly has four kinds, one is be equipped with the supply modules such as storage battery for generator, when wind speed is lower, generator set cannot start, input in generator by counter for the electric energy of supply module, make generator become motor, drag wind wheel and rotate, the method needs to be equipped with independently supply module, not only increase manufacture cost, and need external energy, reduce the Economy of generator set, two is utilize Permanent-magnet bearing to reduce the surface friction drag of Transmitted chains to reduce threshold wind velocity, and the method needs to increase extras equally, adds manufacture cost, three is aerodynamic configurations of amendment blade, the performance of generator set during to improve low wind speed, but the aerodynamic configuration of amendment blade, and change is little, and the method effect is very limited, four is on the generator of wind power generating set, coaxially fix a motor, when wind speed is lower, wind wheel is driven to rotate to reach grid-connected rotating speed by motor, as shown in Figure 1, disclose in patent CN201020044819 and be a kind ofly applicable to the pneumatic continuous running wind-driven generator of low wind speed, comprise and wind power generator rotor 1 and the co-axially fixed motor rotor 3 of aerogenerator stator 2 and a motor stator 4, when wind-force does not reach rated velocity, supplement power by motor and reach rated speed, the method is very effective, but need to increase extra motor, add manufacture cost.So, the method of the threshold wind velocity of current reduction wind power generating set, effect and cost can not be taken into account, how to improve the generating efficiency under the low wind friction velocity of wind-driven generator, under reducing the prerequisite of the threshold wind velocity of wind power generating set, not increasing manufacture cost and the energy consumption of wind power generating set, is problem demanding prompt solution in current wind-power electricity generation problem.
Summary of the invention
In view of this, the present invention proposes a kind of startup control system and method for wind power generating set, to solve generating efficiency under the low wind friction velocity of raising wind power generating set, under reducing the prerequisite of the threshold wind velocity of wind power generating set, do not increase the problem of manufacture cost and energy consumption.
On the one hand, the invention provides a kind of startup control system of wind power generating set, comprise wind speed acquisition device, rotating speed acquisition device, control gear and controlling device.
Wind speed acquisition device, is connected with control gear, for obtaining the real-time wind speed of environment residing for wind power generating set, and real-time wind speed is sent to control gear.
Rotating speed acquisition device, is connected with control gear, for obtaining the real-time rotate speed of the generator shaft of wind power generating set, and real-time rotate speed is sent to control gear.
Control gear, for according to real-time wind speed and real-time rotate speed, determines the target pitch angle of the blade of wind power generating set, and sends control signal according to target pitch angle.Control gear, is also connected with controlling device, for control signal is sent to controlling device.
Controlling device, for according to control signal, is adjusted to target pitch angle by the propeller pitch angle of blade.
Preferably, control gear comprises:
First acquisition module, comprises real-time wind speed, real-time rotate speed and the comparison table with real-time wind speed, real-time rotate speed target pitch angle one to one for obtaining.
Search module, be connected with the first acquisition module, for according to real-time wind speed and real-time rotate speed, the search relationship table of comparisons, determines target pitch angle.
Preferably, control gear comprises:
Second acquisition module, the mathematical model of relation for obtaining the real-time wind speed of sign, between real-time rotate speed and target pitch angle.
Computing module, is connected with the second acquisition module, for according to real-time wind speed and real-time rotate speed, by mathematical model, calculates target pitch angle.
More preferred, target pitch angle, is specially the propeller pitch angle making blade obtain maximum starting torque, or makes wind power generating set reach the propeller pitch angle of grid-connected rotating speed.
More preferred, wind speed acquisition device, is specially air velocity transducer.
More preferred, rotating speed acquisition device, be specially photoelectric tachometric transducer, grating sensor, hall-effect speed sensor, capacitive tachometer transducer, current vortex sensor any one or multiple.
On the other hand, the present invention also provides a kind of startup controlling method of wind power generating set, comprises step:
Obtain the real-time wind speed of environment residing for wind power generating set.
Obtain the real-time rotate speed of the generator shaft of wind power generating set.
According to real-time wind speed and real-time rotate speed, determine the target pitch angle of the blade of wind power generating set, and send control signal according to target pitch angle.
According to control signal, the propeller pitch angle of blade is adjusted to target pitch angle.
Preferably, according to real-time wind speed and real-time rotate speed, determine the step of the target pitch angle of the blade of wind power generating set, comprising:
Obtain and comprise real-time wind speed, real-time rotate speed and the comparison table with real-time wind speed, real-time rotate speed target pitch angle one to one.
According to real-time wind speed and real-time rotate speed, the search relationship table of comparisons, determines target pitch angle.
Preferably, according to real-time wind speed and real-time rotate speed, determine the step of the target pitch angle of the blade of wind power generating set, comprising:
Obtain and characterize real-time wind speed, the mathematical model of relation between real-time rotate speed and target pitch angle.
According to real-time wind speed and real-time rotate speed, by mathematical model, calculate target pitch angle.
More preferred, target pitch angle, is specially and makes blade obtain the propeller pitch angle of maximum starting torque or make wind power generating set reach the propeller pitch angle of grid-connected rotating speed.
The startup control system of above-mentioned wind power generating set and method, the real-time wind speed of environment and the real-time rotate speed of generator of wind generating set axle residing for energy Real-Time Monitoring wind power generating set, according to external environment condition and the oneself state of wind-driven generator and the relation of blade pitch angle of monitoring, determine the target pitch angle of blade, and then send control signal, the propeller pitch angle of blade is adjusted to target pitch angle, the starting torque of blade can be increased, drive wind wheel to accelerate to grid-connected rotating speed, start to generate electricity by way of merging two or more grid systems.Because this target pitch angle determines in real time according to the oneself state of real-time external environment condition and wind power generating set, constantly adjust, so the change of can conform change and generator set oneself state, reaction in time rapidly.Especially residing for wind power generating set, the wind speed of environment is lower, the rotating speed of generator shaft may not reach grid-connected rotating speed, during as about 1000rpm, under the startup control system and method for the wind power generating set of this embodiment, then by the propeller pitch angle of blade is adjusted to target pitch angle, increase the starting torque of blade, under low wind friction velocity, drive wind wheel to accelerate to grid-connected rotating speed, reduce the threshold wind velocity of wind power generating set, and then the generating efficiency that improve under the low wind friction velocity of generator set, and without the need to extras, do not increase manufacture cost and the energy consumption of unit.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural drawing being applicable to the pneumatic continuous running wind-driven generator of low wind speed in correlation technique;
Fig. 2 is the structural drawing of an embodiment of the startup control system of wind power generating set of the present invention;
Fig. 3 is the substructure figure of the preferred embodiment of the control gear of an embodiment of the startup control system of wind power generating set of the present invention;
Fig. 4 is the substructure figure of the preferred embodiment of the control gear of an embodiment of the startup control system of wind power generating set of the present invention;
Fig. 5 is the flow chart of an embodiment of the startup controlling method of wind power generating set of the present invention;
Fig. 6 is the sub-process figure of the preferred embodiment of the rate-determining steps of an embodiment of the startup controlling method of wind power generating set of the present invention;
Fig. 7 is the sub-process figure of the preferred embodiment of the rate-determining steps of an embodiment of the startup controlling method of wind power generating set of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
As shown in Figure 2, show first embodiment of the invention, a kind of startup control system of wind power generating set, comprise wind speed acquisition device 10, rotating speed acquisition device 20, control gear 30 and controlling device 40.
Wind speed acquisition device 10, is connected with control gear 30, for obtaining the real-time wind speed of environment residing for wind power generating set, and real-time wind speed is sent to control gear 30.
Concrete, wind speed acquisition device 10, for being arranged on the one or more devices that can obtain the real-time wind speed of environment residing for wind power generating set near wind power generating set, the real-time wind speed of environment residing for Real-Time Monitoring, and the A/D translation interface being sent to control gear 30 by wired or wireless communication mode.
Rotating speed acquisition device 20, is connected with control gear 30, for obtaining the real-time rotate speed of the generator shaft of wind power generating set, and real-time rotate speed is sent to control gear 30.
Concrete, rotating speed acquisition device 20, for the device of the real-time rotate speed of the generator shaft of wind power generating set can be obtained, the real-time rotate speed of Real-Time Monitoring generator shaft, and be sent to control gear 30 by wired or wireless communication mode.
Control gear 30, for according to real-time wind speed and real-time rotate speed, determines the target pitch angle of the blade of wind power generating set, and sends control signal according to target pitch angle.Control gear 30, is also connected with controlling device 40, for control signal is sent to controlling device 40.
Concrete, control gear 30, according to real-time wind speed and the real-time rotate speed of Real-Time Monitoring, by the real-time wind speed that prestores in control gear 30, relation between real-time rotate speed and the target pitch angle of blade, determine the target pitch angle of blade, and determine corresponding control signal according to this target pitch angle, by wired or wireless communication mode, this control signal is sent to controlling device 40.
Controlling device 40, for according to control signal, is adjusted to target pitch angle by the propeller pitch angle of blade.
Concrete, controlling device 40 is under the effect of the control signal of control gear 30, and drive vane carries out displacement motion, arrives the target pitch angle of specifying.Preferably, controlling device 40, optional but be not limited only to the feather actuator that main flow blower fan possesses, as electric pitch-changing actuator, hydraulic variable-pitch actuator etc.
In this embodiment, the real-time wind speed of environment and the real-time rotate speed of generator of wind generating set axle residing for the startup control system energy Real-Time Monitoring wind power generating set of wind power generating set, according to external environment condition and the oneself state of wind-driven generator and the relation of blade pitch angle of monitoring, determine the target pitch angle of blade, and then send control signal, the propeller pitch angle of blade is adjusted to target pitch angle, the starting torque of blade can be increased, drive wind wheel to accelerate to grid-connected rotating speed, start to generate electricity by way of merging two or more grid systems.Because this target pitch angle determines in real time according to the oneself state of real-time external environment condition and wind power generating set, constantly adjust, so the change of can conform change and generator set oneself state, reaction in time rapidly.Especially residing for wind power generating set, the wind speed of environment is lower, the rotating speed of generator shaft may not reach grid-connected rotating speed, during as about 1000rpm, under the startup control system of the wind power generating set of this embodiment, then by the propeller pitch angle of blade is adjusted to target pitch angle, increase the starting torque of blade, under low wind friction velocity, drive wind wheel to accelerate to grid-connected rotating speed, reduce the threshold wind velocity of wind power generating set, and then the generating efficiency that improve under the low wind friction velocity of generator set, and without the need to extras, do not increase manufacture cost and the energy consumption of unit.
As shown in Figure 3, show first preferred embodiment of this first embodiment, control gear 30 comprises:
First acquisition module 31, comprises real-time wind speed, real-time rotate speed and the comparison table with real-time wind speed, real-time rotate speed target pitch angle one to one for obtaining.
Search module 32, be connected with the first acquisition module 31, for according to real-time wind speed and real-time rotate speed, the search relationship table of comparisons, determines target pitch angle.
Concrete, by aerodynamic modeling, build the aerodynamic model of wind generator set blade, the aerodynamic model start up period of especially, obtained the propeller pitch angle comparison table of corresponding varying environment wind speed and generator shaft speed by the mode of test, be stored in advance in control gear 30 for subsequent use.In this embodiment, the first acquisition module 31, can be specially volatile memory or other storage chip that can write.Search module 32, according to real-time wind speed and the real-time rotate speed of monitoring, from the comparison table prestored, corresponding acquisition target pitch angle.
In this embodiment, obtain in advance and comprise real-time wind speed, real-time rotate speed and the comparison table with real-time wind speed, real-time rotate speed target pitch angle one to one, according to this table of comparisons determination target pitch angle, convenient and swift.
As shown in Figure 4, show second preferred embodiment of this first embodiment, control gear 30 comprises:
Second acquisition module 33, the mathematical model of relation for obtaining the real-time wind speed of sign, between real-time rotate speed and target pitch angle.
Computing module 34, is connected with the second acquisition module 33, for according to real-time wind speed and real-time rotate speed, by mathematical model, calculates target pitch angle.
Concrete, pass through aerodynamic modeling, build the aerodynamic model of wind generator set blade, especially aerodynamic model start up period, the propeller pitch angle of corresponding varying environment wind speed and generator shaft speed is obtained by test or the mode of theory calculate, and build according to the result of test of many times further characterize real-time wind speed, the mathematical model of relation between real-time rotate speed and target pitch angle, optional but be not limited only to nonlinear function, be stored in control gear 30 with the form of program.In this embodiment, the second acquisition module 33 is optional but be not limited only to PLD PLC.Now, computing module 34, according to real-time wind speed and the real-time rotate speed of monitoring, substitutes into the mathematical model built in advance, to calculate target pitch angle.
In this embodiment, obtain in advance and characterize real-time wind speed, the mathematical model of relation between real-time rotate speed and target pitch angle, according to this mathematical model determination target pitch angle, because this mathematical model is continuous print functional form, lookup table mode can be avoided may to occur for certain wind speed or rotating speed, can not find the situation of corresponding target pitch angle, application area is wider.
Preferably, target pitch angle, is specially the propeller pitch angle making blade obtain maximum starting torque.
In this embodiment, under the real-time wind speed, real-time rotate speed of correspondence, blade is adjusted to the propeller pitch angle obtaining maximum starting torque, drive wind wheel to accelerate to grid-connected rotating speed, generator connecting in parallel with system generates electricity, and greatly reduces the minimum windspeed made needed for generator connecting in parallel with system generating.
Preferably, target pitch angle, is specially the propeller pitch angle making wind power generating set reach grid-connected rotating speed.
In this embodiment, under the real-time wind speed of correspondence, real-time rotate speed, blade is adjusted to the propeller pitch angle making wind power generating set reach grid-connected rotating speed, starts to generate electricity by way of merging two or more grid systems, the wind speed that generator connecting in parallel with system is generated electricity can be reduced to a certain extent.
Preferably, wind speed acquisition device 10, is specially air velocity transducer.More preferred, air velocity transducer, optional but be not limited only to anemoscope.
Preferably, rotating speed acquisition device 20, be specially light velocity formula speed probe, grating sensor, hall-effect speed sensor, capacitive tachometer transducer, current vortex sensor any one or multiple.More preferred, rotating speed acquisition device 20 is optional but be not limited only to encoder, gathers generator shaft speed signal.
On the other hand, as shown in Figure 5, show the second embodiment of the present invention, a kind of startup controlling method of wind power generating set, comprises step:
S100: the real-time wind speed obtaining environment residing for wind power generating set.
S200: the real-time rotate speed obtaining the generator shaft of wind power generating set.
S300: according to real-time wind speed and real-time rotate speed, determines the target pitch angle of the blade of wind power generating set, and sends control signal according to target pitch angle.
S400: according to control signal, is adjusted to target pitch angle by the propeller pitch angle of blade.
In this embodiment, the startup controlling method of wind power generating set can monitor the real-time wind speed of current environment and current real-time rotate speed, and according to the relation of the two and blade pitch angle, determine the target pitch angle of blade, and then send control signal, the propeller pitch angle of blade is adjusted to target pitch angle, the starting torque of blade can be increased, drive wind wheel to accelerate to grid-connected rotating speed, start to generate electricity by way of merging two or more grid systems.Especially, when residing for wind power generating set, the wind speed of environment is lower, the rotating speed of generator shaft may not reach the rotating speed that generates electricity by way of merging two or more grid systems, as about 1000rpm, under the startup controlling method of the wind power generating set of this embodiment controls, then by the propeller pitch angle of blade is adjusted to target pitch angle, increase the starting torque of blade, under low wind friction velocity, drive wind wheel to accelerate to grid-connected rotating speed, reduce the threshold wind velocity of wind power generating set, and then the generating efficiency that improve under the low wind friction velocity of generator set, and without the need to extras, do not increase the manufacture cost of unit.
Preferably, as shown in Figure 6, show the first preferred embodiment of second embodiment of the invention, step S300, comprising:
S310: obtain and comprise real-time wind speed, real-time rotate speed and the comparison table with real-time wind speed, real-time rotate speed target pitch angle one to one.
S320: according to real-time wind speed and real-time rotate speed, the search relationship table of comparisons, determines target pitch angle.
Preferably, as shown in Figure 7, show the second preferred embodiment of second embodiment of the invention, step S300, comprising:
S330: obtain and characterize real-time wind speed, the mathematical model of relation between real-time rotate speed and target pitch angle.
S340: according to real-time wind speed and real-time torque, by mathematical model, calculates target pitch angle.
Preferably, target pitch angle, is specially and makes blade obtain the propeller pitch angle of maximum starting torque or wind power generating set be reached generate electricity by way of merging two or more grid systems the propeller pitch angle of rated speed.
The startup controlling method of above-mentioned wind power generating set is corresponding with the startup control system of above-mentioned wind power generating set; its embodiment and technique effect do not repeat them here; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention; within the spirit and principles in the present invention all; any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a startup control system for wind power generating set, is characterized in that, comprises wind speed acquisition device, rotating speed acquisition device, control gear and controlling device;
Described wind speed acquisition device, is connected with described control gear, for obtaining the real-time wind speed of environment residing for described wind power generating set, and described real-time wind speed is sent to described control gear;
Described rotating speed acquisition device, is connected with described control gear, for obtaining the real-time rotate speed of the generator shaft of described wind power generating set, and described real-time rotate speed is sent to described control gear;
Described control gear, for according to described real-time wind speed and described real-time rotate speed, determines the target pitch angle of the blade of described wind power generating set, and sends control signal according to described target pitch angle; Described control gear, is also connected with described controlling device, for described control signal is sent to described controlling device;
Described controlling device, for according to described control signal, is adjusted to described target pitch angle by the propeller pitch angle of described blade.
2. the startup control system of wind power generating set according to claim 1, is characterized in that,
Described control gear comprises:
First acquisition module, comprises described real-time wind speed, described real-time rotate speed and the comparison table with described real-time wind speed, described real-time rotate speed described target pitch angle one to one for obtaining;
Search module, be connected with described first acquisition module, for according to described real-time wind speed and described real-time rotate speed, search described comparison table, determine described target pitch angle.
3. the startup control system of wind power generating set according to claim 1, is characterized in that, described control gear comprises:
Second acquisition module, the mathematical model of relation for obtaining the described real-time wind speed of sign, between described real-time rotate speed and described target pitch angle;
Computing module, is connected with described second acquisition module, for according to described real-time wind speed and described real-time rotate speed, by described mathematical model, calculates described target pitch angle.
4. the startup control system of the wind power generating set according to claim 1-3 any one, it is characterized in that, described target pitch angle, is specially the propeller pitch angle making described blade obtain maximum starting torque, or makes described wind power generating set reach the propeller pitch angle of grid-connected rotating speed.
5. the startup control system of wind power generating set according to claim 4, is characterized in that, described wind speed acquisition device, is specially air velocity transducer.
6. the startup control system of wind power generating set according to claim 4, it is characterized in that, described rotating speed acquisition device, be specially photoelectric tachometric transducer, grating sensor, hall-effect speed sensor, capacitive tachometer transducer, current vortex sensor any one or multiple.
7. a startup controlling method for wind power generating set, is characterized in that, comprise step:
Obtain the real-time wind speed of environment residing for described wind power generating set;
Obtain the real-time rotate speed of the generator shaft of described wind power generating set;
According to described real-time wind speed and described real-time rotate speed, determine the target pitch angle of the blade of described wind power generating set, and send control signal according to described target pitch angle;
According to described control signal, the propeller pitch angle of described blade is adjusted to described target pitch angle.
8. the startup controlling method of wind power generating set according to claim 7, is characterized in that, described according to described real-time wind speed and described real-time rotate speed, determines the step of the target pitch angle of the blade of described wind power generating set, comprising:
Obtain and comprise described real-time wind speed, described real-time rotate speed and the comparison table with described real-time wind speed, described real-time rotate speed described target pitch angle one to one;
According to described real-time wind speed and described real-time rotate speed, search described comparison table, determine described target pitch angle.
9. the startup controlling method of wind power generating set according to claim 7, is characterized in that, described according to described real-time wind speed and described real-time rotate speed, determines the step of the target pitch angle of the blade of described wind power generating set, comprising:
Obtain and characterize described real-time wind speed, the mathematical model of relation between described real-time rotate speed and described target pitch angle;
According to described real-time wind speed and described real-time rotate speed, by described mathematical model, calculate described target pitch angle.
10. the startup controlling method of the wind power generating set according to claim 7-9 any one, it is characterized in that, described target pitch angle, is specially and makes described blade obtain the propeller pitch angle of maximum starting torque or make described wind power generating set reach the propeller pitch angle of grid-connected rotating speed.
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| CN201510613718.2A CN105134489A (en) | 2015-09-23 | 2015-09-23 | Start control system and method of wind generating unit |
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| CN112055782A (en) * | 2018-05-03 | 2020-12-08 | 通用电气公司 | System and method for controlling a pitch angle of a wind turbine rotor blade |
| CN112055782B (en) * | 2018-05-03 | 2023-10-31 | 通用电气公司 | System and method for controlling pitch angle of wind turbine rotor blades |
| CN110566402A (en) * | 2019-03-19 | 2019-12-13 | 南京南瑞继保电气有限公司 | Control method for automatic start and stop of permanent magnet direct drive fan main control system unit |
| CN110566402B (en) * | 2019-03-19 | 2021-02-09 | 南京南瑞继保电气有限公司 | Control method for automatic start and stop of permanent magnet direct drive fan main control system unit |
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Application publication date: 20151209 |