CN214616870U - Wind turbine generator system wind wheel overspeed active protection device - Google Patents
Wind turbine generator system wind wheel overspeed active protection device Download PDFInfo
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- CN214616870U CN214616870U CN202120510785.2U CN202120510785U CN214616870U CN 214616870 U CN214616870 U CN 214616870U CN 202120510785 U CN202120510785 U CN 202120510785U CN 214616870 U CN214616870 U CN 214616870U
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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
Abstract
The utility model provides a wind turbine generator system wind wheel overspeed initiative protection device belongs to wind generating set safety protection field, wherein, the piezoelectricity charge information that produces when wind turbine generator system wind wheel overspeed initiative protection device detects the wind wheel rotation through piezoelectricity charge detection module and send for after handling through signal processing module control module, control module are suitable for and calculate the current rotational speed of wind wheel according to the piezoelectricity charge information of receipt, when the current rotational speed of wind wheel of calculation surpasss preset speed, trigger relay work makes wind turbine generator system's wind wheel promptly receive the oar, under the condition that does not adopt complicated mechanical structure and sensor chip, but the rotational speed of accurate measurement wind wheel carries out overspeed initiative protection to an autonomic controllable, low-cost technical scheme has improved wind turbine generator system's security greatly.
Description
Technical Field
The utility model relates to a wind generating set safety protection field, concretely relates to wind turbine generator system wind wheel overspeed initiative protection device.
Background
In recent years, the wind turbine generator occasionally has accidents of tower inversion and fire, which causes great economic loss to wind power owners. The reason for tower collapse and fire accidents of the wind turbine generator is mainly caused by the fact that the generator is in overspeed protection failure and the generator is in continuous overspeed operation.
The existing unit is provided with a rotating speed detection and protection system, a general master control system safety chain is provided with more than two hardware rotating speed detection and overspeed protection modules, and hot wire signals of normal rotating speed of the unit and emergency feathering of the variable pitch are transmitted to the variable pitch system through a slip ring. When the rotating speed is normal and the unit state is normal, the hot line signals of the normal rotating speed of the unit and the emergency feathering of the variable pitch are high level. When the overspeed protection module detects that the unit is overspeed or the main control performs emergency feathering, the hot wire signal of the 'normal rotating speed' of the unit or the 'emergency feathering of the variable pitch' is low level, and the variable pitch system performs emergency feathering.
However, sometimes the hot wire signal of the 'normal rotating speed of the unit' or 'emergency feathering of the variable pitch' is mistakenly connected or short-connected to the positive electrode of the power supply due to the installation construction of the unit or multiple technical reconstruction after operation, at this time, when the unit is overspeed or performs emergency feathering, the master control system cannot disconnect the hot wire signal, so that the emergency feathering of the variable pitch system cannot be performed, and finally the unit continuously overspeed until tower collapse or fire accident occurs.
A plurality of wind wheel overspeed active protection improvement designs have been carried out to this kind of risk in the present industry, if carry out centrifugal mechanical mechanism design at wheel hub, when centrifugal mechanical mechanism spring trigger protection system action, if increase speed measuring encoder etc. at wheel hub still, but equipment and transformation work are complicated relatively, and the cost is higher.
The above problems are currently in need of solution.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a wind turbine generator system wind wheel overspeed initiative protection device is provided to realize the purpose that the wind wheel overspeed initiative protection.
The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a wind turbine generator system wind wheel overspeed initiative protection device includes:
the device comprises a piezoelectric charge detection module, a signal processing module, a control module and a relay;
the piezoelectric charge detection module is electrically connected with the control module through the signal processing module, is suitable for detecting piezoelectric charge information generated when the wind wheel rotates, and is sent to the control module after being processed through the signal processing module;
the control module is suitable for calculating the current rotating speed of the wind wheel according to the received piezoelectric charge information;
the control module is electrically connected with the relay and is suitable for triggering the relay to work when the calculated current rotating speed of the wind wheel exceeds the preset speed, so that the wind wheel of the wind turbine generator set can be emergently retracted.
Further, the piezoelectric charge detection module is a piezoelectric sensor.
Further, the signal processing module comprises an amplifying circuit and a hardware filtering circuit;
the piezoelectric charge information detected by the piezoelectric charge detection module is amplified by the amplifying circuit and filtered by the hardware filter circuit and then is sent to the control module.
Further, the control module comprises a low-pass filtering unit, a first notch filtering unit and a second notch filtering unit;
the control module filters high-frequency interference signals through the low-pass filtering unit and then sequentially filters vibration frequency generated when the wind wheel of the fan set runs through the first notch filtering unit and the second notch filtering unit.
Further, the center frequency of the first notch filter unit is a first-order vibration frequency of a tower of the wind turbine generator, and the center frequency of the second notch filter unit is a natural vibration frequency of a transmission chain.
Further, the piezoelectric charge detection module comprises a mass block, a piezoelectric element and a base;
the piezoelectric element is arranged between the mass block and the base;
the base is vertically fixed on the section inside the hub of the wind wheel.
Further, the piezoelectric charge Q ═ K (M + M/2) a, a ═ a, detected by the piezoelectric charge detection module0+g cos(θ)；
Wherein Q is a piezoelectric chargeK is the piezoelectric constant of the piezoelectric element, M is the mass of the mass block, M is the mass of the piezoelectric element, a is the component of the overall acceleration of the piezoelectric element in the radial direction, a0The angular velocity is the centrifugal acceleration generated by the angular velocity omega, g is the gravity acceleration, and theta is the included angle between the piezoelectric charge detection module and the center of the hub and the vertical direction.
Further, the control module further comprises an external communication interface.
Further, the external communication interface is any one of an RS485 communication interface and a CANopen communication interface.
The utility model has the advantages that: the utility model provides a wind turbine generator system wind wheel overspeed initiative protection device, wherein, wind turbine generator system wind wheel overspeed initiative protection device passes through the piezoelectricity charge information that produces when piezoelectricity charge detection module detects the wind wheel rotation and sends after processing through signal processing module for control module, control module are suitable for and calculate the current rotational speed of wind wheel according to the piezoelectricity charge information of receipt, when the current rotational speed of wind wheel of calculation surpasss preset speed, trigger relay work, make wind turbine generator system's wind wheel promptly receive the oar, under the condition that does not adopt complicated mechanical structure and sensor chip, but the rotational speed of accurate measurement wind wheel carries out overspeed initiative protection to an independently controllable, low-cost technical scheme has improved wind turbine generator system's security greatly.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic block diagram of an active protection device for overspeed of a wind turbine generator system provided by an embodiment of the present invention.
Fig. 2 is a schematic block diagram of a piezoelectric charge detection module according to an embodiment of the present invention.
Fig. 3 is an equivalent circuit diagram of an amplifying circuit according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of a hardware filter circuit according to an embodiment of the present invention.
Fig. 5 is a transfer function diagram of a software filtering module according to an embodiment of the present invention.
Fig. 6 is a graph of the acceleration and the rotation angle of the wind wheel after the software filtering processing provided by the embodiment of the present invention.
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, and merely illustrates the basic structure of the present invention in a schematic manner, and therefore it shows only the constitution related to the present invention.
Referring to fig. 1, the embodiment provides an active protection device for overspeed of a wind wheel of a wind turbine generator. Wind turbine generator system wind wheel overspeed initiative protection device includes: the device comprises a piezoelectric charge detection module, a signal processing module, a control module and a relay; the piezoelectric charge detection module is electrically connected with the control module through the signal processing module, is suitable for detecting piezoelectric charge information generated when the wind wheel rotates, and is sent to the control module after being processed through the signal processing module; the control module is suitable for calculating the current rotating speed of the wind wheel according to the received piezoelectric charge information; the control module is electrically connected with the relay and is suitable for triggering the relay to work when the calculated current rotating speed of the wind wheel exceeds the preset speed, so that the wind wheel of the wind turbine generator set can be emergently retracted. Under the condition of not adopting a complex mechanical structure and a sensor chip, the rotating speed of the wind wheel can be accurately measured and overspeed active protection can be carried out, and the safety of the wind turbine generator set is greatly improved by adopting an autonomous controllable and low-cost technical scheme.
As shown in fig. 2, in the present embodiment, the piezoelectric charge detection module is a piezoelectric sensor. Specifically, the piezoelectric charge detection module comprises a mass block, a piezoelectric element and a base; the piezoelectric element is arranged between the mass block and the base; the base is vertically fixed on the section inside the hub of the wind wheel. The piezoelectric charge detection module rotates along with the wind wheel, the mass block acts on the piezoelectric element due to the resultant force of centrifugal force and gravity, piezoelectric charges are generated at two ends of the polarization direction of the mass block, and the piezoelectric charges are in direct proportion to the acceleration generated by the resultant force.
Specifically, the piezoelectric charge Q ═ K (M + M/2) a, a ═ a, detected by the piezoelectric charge detection module0+g cos(θ)；
Wherein Q is a piezoelectric charge, K is a piezoelectric constant of the piezoelectric element, M is a mass of the mass block, M is a mass of the piezoelectric element, a is a component of the integrated acceleration of the piezoelectric element in a radial direction, a0The angular velocity is the centrifugal acceleration generated by the angular velocity omega, g is the gravity acceleration, and theta is the included angle between the piezoelectric charge detection module and the center of the hub and the vertical direction.
In this embodiment, the signal processing module includes an amplifying circuit and a hardware filter circuit; the piezoelectric charge information detected by the piezoelectric charge detection module is amplified by the amplifying circuit and filtered by the hardware filter circuit and then is sent to the control module.
An equivalent circuit diagram of the amplifier circuit is shown in fig. 3. Wherein A is the open loop gain of the operational amplifier; q is the piezoelectric element charge amount; rfThe leakage resistance is connected in parallel at two ends of the feedback capacitor; cfIs the feedback capacitance of the operational amplifier; raAn insulation resistance which is a piezoelectric charge generation element; riIs the input resistance of the operational amplifier; caAn equivalent capacitance of the piezoelectric charge generation element; ciIs the input capacitance of the operational amplifier; ccIs the cable capacitance.
Since the amplifier gain A is 104～106Order of magnitude, satisfies (1+ A) Cf>>Ca+Cc+CiThen the amplifier output voltage is
The circuit diagram of the hardware filter circuit is shown in FIG. 4, the voltage transfer function of the hardware low-pass filter
Wherein the content of the first and second substances,
RFis a feedback resistor.
In this embodiment, the control module includes a Low Pass Filter unit, a first notch Filter unit NotchFilter1, and a second notch Filter unit NotchFilter 2; the control module filters high-frequency interference signals through the low-pass filtering unit and then sequentially filters vibration frequency generated when the wind wheel of the fan set runs through the first notch filtering unit and the second notch filtering unit. In this embodiment, the low-pass filtering unit, the first notch filtering unit, and the second notch filtering unit are processed by software filtering, and the transfer function of the software filtering module is as shown in fig. 5.
The central frequency of the first notch filtering unit is the first-order vibration frequency of the tower of the wind turbine generator, and the central frequency of the second notch filtering unit is the inherent vibration frequency of the transmission chain.
In this embodiment, the curve of the acceleration and the rotation angle of the wind wheel after the software filtering in the control module is shown in fig. 6, and the envelope a of the maximum value in fig. 6max＝a0+g,amaxThe acceleration is the acceleration when the piezoelectric charge detection module rotates to the position right below the wind wheel, and the centrifugal acceleration a is generated due to the rotation of the wind wheel0＝amax-g, the current rotational speed of the rotor:
the control module judges the current rotating speed of the wind wheel, and when the calculated current rotating speed of the wind wheel exceeds the preset speed, the relay is triggered to work, so that the wind wheel of the wind turbine generator set carries out emergency pitch retracting. In this embodiment, the control module further includes an external communication interface. Wherein, the external communication interface is any one of RS485 and CANopen communication interfaces. The wind turbine generator system state monitoring system is in communication connection with a master control system or a debugging computer of the wind turbine generator system through an external communication interface, and uploads state data of a wind turbine rotating speed and a wind turbine overspeed active protection device of the wind turbine generator system to carry out related parameter setting.
Example 2
The embodiment also provides a wind turbine generator, which comprises a variable pitch control system and the wind turbine overspeed active protection device of the wind turbine generator; the controller of the wind turbine overspeed active protection device of the wind turbine generator is connected in series into the pitch control system and is suitable for triggering the relay to work when the current rotating speed of the wind turbine calculated by the main control module exceeds a preset speed, so that the pitch control system is triggered to control the wind turbine of the wind turbine generator to carry out emergency pitch collection.
To sum up, the utility model provides a wind turbine generator system wind wheel overspeed initiative protection device, wherein, wind turbine generator system wind wheel overspeed initiative protection device detects the piezoelectricity charge information that produces when the wind wheel is rotatory through piezoelectricity charge detection module and sends after processing through signal processing module control module, control module are suitable for and calculate the current rotational speed of wind wheel according to the piezoelectricity charge information of receipt, when the current rotational speed of wind wheel of calculation surpasss preset speed, trigger relay work makes wind turbine generator system's wind wheel promptly receive the oar, under the condition that does not adopt complicated mechanical structure and sensor chip, but the rotational speed of accurate measurement wind wheel carries out overspeed initiative protection to it is independently controllable, low-cost technical scheme has improved wind turbine generator system's security greatly.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. The utility model provides a wind turbine generator system wind wheel overspeed initiative protection device which characterized in that includes:
the device comprises a piezoelectric charge detection module, a signal processing module, a control module and a relay;
the piezoelectric charge detection module is electrically connected with the control module through the signal processing module, is suitable for detecting piezoelectric charge information generated when the wind wheel rotates, and is sent to the control module after being processed through the signal processing module;
the control module is suitable for calculating the current rotating speed of the wind wheel according to the received piezoelectric charge information;
the control module is electrically connected with the relay and is suitable for triggering the relay to work when the calculated current rotating speed of the wind wheel exceeds the preset speed, so that the wind wheel of the wind turbine generator set can be emergently retracted.
2. Active protection device for wind turbine overspeed according to claim 1,
the piezoelectric charge detection module is a piezoelectric sensor.
3. The active overspeed protection device for wind turbines according to claim 1, wherein said signal processing module comprises an amplifying circuit and a hardware filter circuit;
the piezoelectric charge information detected by the piezoelectric charge detection module is amplified by the amplifying circuit and filtered by the hardware filter circuit and then is sent to the control module.
4. The active wind turbine overspeed protection device of claim 3, wherein said control module comprises a low pass filter unit, a first notch filter unit, and a second notch filter unit;
the control module filters high-frequency interference signals through the low-pass filtering unit and then sequentially filters vibration frequency generated when the wind wheel of the fan set runs through the first notch filtering unit and the second notch filtering unit.
5. The active overspeed protection device of wind turbine generator according to claim 4, wherein the center frequency of the first notch filter unit is a first-order vibration frequency of the tower of the wind turbine generator, and the center frequency of the second notch filter unit is a natural vibration frequency of the drive train.
6. Wind turbine rotor overspeed active protection device according to claim 1, characterized in that
The piezoelectric charge detection module comprises a mass block, a piezoelectric element and a base;
the piezoelectric element is arranged between the mass block and the base;
the base is vertically fixed on the section inside the hub of the wind wheel.
7. Active protection device for wind turbine overspeed according to claim 6,
the piezoelectric charge Q ═ K (M + M/2) a, a ═ a detected by the piezoelectric charge detection module0+gcos(θ)；
Wherein Q is a piezoelectric charge, K is a piezoelectric constant of the piezoelectric element, M is a mass of the mass block, M is a mass of the piezoelectric element, a is a component of the integrated acceleration of the piezoelectric element in a radial direction, a0The angular velocity is the centrifugal acceleration generated by the angular velocity omega, g is the gravity acceleration, and theta is the included angle between the piezoelectric charge detection module and the center of the hub and the vertical direction.
8. The active wind turbine overspeed protection device of claim 1 wherein said control module further comprises an external communication interface.
9. The active wind turbine overspeed protection device as set forth in claim 8, wherein said external communication interface is any one of RS485 and CANopen communication interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120510785.2U CN214616870U (en) | 2021-03-10 | 2021-03-10 | Wind turbine generator system wind wheel overspeed active protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120510785.2U CN214616870U (en) | 2021-03-10 | 2021-03-10 | Wind turbine generator system wind wheel overspeed active protection device |
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| Publication Number | Publication Date |
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| CN214616870U true CN214616870U (en) | 2021-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120510785.2U Active CN214616870U (en) | 2021-03-10 | 2021-03-10 | Wind turbine generator system wind wheel overspeed active protection device |
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| CN (1) | CN214616870U (en) |
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2021
- 2021-03-10 CN CN202120510785.2U patent/CN214616870U/en active Active
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