CN201925092U

CN201925092U - Wind turbine pitch control system

Info

Publication number: CN201925092U
Application number: CN2010206519936U
Authority: CN
Inventors: 傅建民; 王政; 尤林森; 董雪迪
Original assignee: Reenergy Electric Suzhou Co Ltd
Current assignee: Reenergy Electric Suzhou Co Ltd
Priority date: 2010-12-10
Filing date: 2010-12-10
Publication date: 2011-08-10
Anticipated expiration: 2020-12-10

Abstract

The utility model provides a wind turbine pitch control system which comprises at least one blade, pitch control motors, pitch control drivers and a pitch control motor measuring device; the pitch control motors are in one-to-one correspondence connection with the blades and used for adjusting the angles of the corresponding blades; the pitch control drivers are in one-to-one correspondence connection with the pitch control motors and used for controlling the movement of the pitch control motors; and the pitch control motor measuring device adopts a rotary transformer and is used for monitoring the speed and position of the pitch control motors. The utility model has the benefits that since the rotary transformer is adopted as the pitch control motor measuring device, the adaptive capacity to environment and the reliability of the speed and position measuring device in the pitch control system are enhanced; the measuring accuracy is enhanced through the optimized detection circuit; and meanwhile, since the rotary transformer is used for replacing the absolute encoder or the incremental encoder for the tachogenerator, the cost is reduced.

Description

Wind power pitch-controlled system

Technical field

The utility model relates to a kind of wind power pitch-controlled system, relates in particular to the change oar motor measuring device of wind power pitch-controlled system.

Background technique

Along with non-renewable energy resources face exhausted awkward situation at world wide, for satisfying industrialized production and the human lives is required, people are to the concern of solar energy, wind-force, these renewable energy sourcess of waterpower and utilize day by day and promote.Wherein, wind-power electricity generation is a kind of relatively ripe energy development technology that developed, as the emphasis of China's new energy development strategy.

Wind-driven power generation control system requires to have stronger adaptive capacity to environment.Wind power pitch-controlled system is one of core component of wind-power electricity generation, and main effect is the angle that changes the wind power generating set blade according to the size of wind-driven generator output power, guarantees that wind-driven generator output is in rated power.Wind power pitch-controlled system is installed in the wheel hub of wind power generating set, rotates with wheel hub during work.Therefore require pitch-controlled system not only stronger adaptive capacity to environment will be arranged, also require certain shock-resistant and shock resistance.Simultaneously, for guaranteeing the efficient of wind-driven generator, pitch-controlled system is had relatively high expectations to control accuracy, needs to guarantee to become the precision of oar motor speed and position measurement.

The method of measurement of wind power pitch-controlled system medium velocity and position adopts tachometer generator to add absolute value encoder at present mostly, or increment type adds absolute value encoder.What tachometer generator was exported is analog signals, and its adaptive capacity to environment and antijamming capability are stronger, but precision is relatively poor, and has increased the size of motor, and pitch-controlled system requires the size of motor as far as possible little, is restricted more in high-power pitch-controlled system.The employing incremental encoder tests the speed, and its advantage is resolution height, precision height.Its shortcoming is to be subjected to influence of temperature change easily, not shock-resistant and vibrations, and adaptive capacity to environment is relatively poor.

The model utility content

At the deficiencies in the prior art, the utility model purpose is to provide a kind of change oar precise and stable, the wind power pitch-controlled system that cost is low.

For solving the problems of the technologies described above, the technical solution of the utility model is achieved in that a kind of wind power pitch-controlled system, comprises at least one blade; Be connected one to one with described blade, regulate the change oar motor of corresponding blade angle; Be connected one to one with described change oar motor, control becomes the variable pitch driver of oar motor action; Monitoring becomes the speed of oar motor and the change oar motor measuring device of position, and described change oar motor measuring device is rotary transformer.

Preferably, described rotary transformer is a sine and cosine resolver.

Preferably, also comprise the testing circuit that connects described rotary transformer.

Preferably, described testing circuit comprises analog sampling circuit and comparison circuit.

Preferably, described testing circuit comprises anti-twitter circuit.

Preferably, have the CAN communication interface on described main control unit and the variable pitch driver respectively, the CAN communication interface of described main control unit and the CAN communication interface of variable pitch driver use the CAN bus to be connected.

Preferably, described variable pitch driver comprises that record becomes the storage of this running position of oar motor.

Preferably, described variable pitch driver connects outside power supply, and variable pitch driver also is included in the working power of discharging when described power supply cuts off the power supply.

Preferably, the quantity of described blade is 3.

Compared with prior art, the beneficial effects of the utility model are: by adopting rotary transformer as the speed that becomes the oar motor and the measuring device of position, improved the adaptive capacity to environment and the reliability of pitch-controlled system medium velocity and position-measurement device.And improved the precision of measuring by the testing circuit of optimizing.Simultaneously, substituted tachometer generator with rotary transformer and added absolute value encoder, or increment type adds absolute value encoder, cost is reduced.

Description of drawings

Fig. 1 is the schematic representation of analog sampling circuit of the present utility model.

Fig. 2 is the schematic representation of comparison circuit of the present utility model.

Fig. 3 is the schematic representation of anti-twitter circuit of the present utility model.

Embodiment

Mode with example describes embodiment of the present utility model with reference to the accompanying drawings.

The wind power pitch-controlled system of embodiment comprises blade, becomes oar motor, variable pitch driver and main control unit.

Blade needs 1 at least, is generally 3, change oar motor of regulating this blade angle of the connection of each blade correspondence; Each becomes the variable pitch driver of this change oar motor action of control of connection of oar motor correspondence; Wind power pitch-controlled system also comprises main control unit, and its connection is also controlled each variable pitch driver.

The wind-force pitch-controlled system also comprises change oar motor measuring device, is used to monitor speed and the position that becomes the oar motor, and for the variable pitch driver reference, control becomes oar motor action adjusting blade.Change oar motor measuring device of the present utility model is rotary transformer.

Rotary transformer is a kind of accurate angle, position, speed detector, and it is not afraid of jerk, and is high temperature resistant, and adaptive capacity to environment is very strong, and its resolution and measuring accuracy can change by control circuit and software algorithm.Rotary transformer is specially a kind of electromagnetic sensor, and a kind of small-sized Wechselstrommotor of the usefulness that takes measurement of an angle is used for measuring the rotating shaft angular travel and the angular velocity of rotating object, is made up of stator and rotor.Wherein staor winding is as exciting winding.The rotor winding obtains induced voltage as the secondary of transformer by electromagnetic coupling, and the size of its output voltage changes with rotor angular displacement, and the voltage magnitude of output winding becomes the sin cos functions relation with angle of rotor.Because the harmonic component of cosine and sine signal is little, antijamming capability is stronger, so adopts the sine and cosine resolver in the rotary transformer in the present embodiment.

It may be noted that variable pitch driver is connected with the externally fed power supply, and variable pitch driver comprises storage and working power.Rotary transformer can only write down the individual pen position, for this reason, need write down the position of this operation in variable pitch driver, is stored in the aforesaid storage (ROM).And even the power supply sudden power of driver, because the working power of driver is longer discharge time, this moment, variable pitch driver still can write down the position of this operation.So just solved the measurement problem of multi-turn position in the pitch-controlled system.

Rotary transformer also comprises testing circuit, main analog sampling circuit of testing circuit and comparison circuit.Respectively as depicted in figs. 1 and 2.It is noted that the testing circuit of the positive string section that only draws among Fig. 1 and Fig. 2, the testing circuit of cosine part is identical with it, draws no longer separately.

The analog sampling circuit of rotary transformer is concrete as Fig. 1, mainly is the sine and cosine value of sampling rotary transformer output, adopts the high-performance amplifier, and adds the filtering link, selects suitable parameters for use, can improve sampling precision.The output comparison circuit of rotary transformer is concrete as Fig. 2, and it inserts four comparison point by comparator with the sine and cosine output of a circle, and each comparison point can be carried out position and velocity correction, has avoided adding up sampling error.

For further improving precision, the testing circuit of this specific embodiment also comprises an anti-twitter circuit, specifically as shown in Figure 3.When inserting the zero passage comparison point,, can cause shake and skew that comparison point is inserted because can there be error in the SIN and the COS analogue value of rotary transformer output.Utilize the CLK signal of the phase difference (as shown in Figure 2) of SIN+ and SIN-comparison signal generation as d type flip flop, go to beat the B phase signals, at this moment B overturns mutually certainly.In like manner, utilize phase difference that the comparison signal of COS+ and COS-produces CLK signal, go to beat the A phase signals as d type flip flop.So just eliminate the shake of comparison point, reduced the climbing time of insertion point rising edge simultaneously, improved sampling precision.

Although be the example purpose, preferred implementation of the present utility model is disclosed, but those of ordinary skill in the art will recognize that under situation about not breaking away from by the disclosed scope and spirit of the present utility model of appending claims, various improvement, increase and replacement are possible.

Claims

1. a wind power pitch-controlled system comprises,

At least one blade;

Be connected one to one with described blade, regulate the change oar motor of corresponding blade angle;

Be connected one to one with described change oar motor, control becomes the variable pitch driver of oar motor action;

Monitoring becomes the speed of oar motor and the change oar motor measuring device of position, it is characterized in that:

Described change oar motor measuring device is rotary transformer.

2. according to the wind power pitch-controlled system described in the claim 1, it is characterized in that: described rotary transformer is a sine and cosine resolver.

3. according to the wind power pitch-controlled system described in the claim 1, it is characterized in that: also comprise the testing circuit that connects described rotary transformer.

4. according to the wind power pitch-controlled system described in the claim 3, it is characterized in that: described testing circuit comprises analog sampling circuit and comparison circuit.

5. according to the wind power pitch-controlled system described in the claim 3, it is characterized in that: described testing circuit comprises anti-twitter circuit.

6. according to the wind power pitch-controlled system described in the claim 1, it is characterized in that: described variable pitch driver comprises that record becomes the storage of this running position of oar motor.

7. according to the wind power pitch-controlled system described in the claim 1, it is characterized in that: described variable pitch driver connects outside power supply, and variable pitch driver also is included in the working power of discharging when described power supply cuts off the power supply.

8. according to the wind power pitch-controlled system described in the claim 1, it is characterized in that: the quantity of described blade is 3.