CN216922368U - Blade deformation detection circuit of wind power supply system - Google Patents
Blade deformation detection circuit of wind power supply system Download PDFInfo
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- CN216922368U CN216922368U CN202220899530.4U CN202220899530U CN216922368U CN 216922368 U CN216922368 U CN 216922368U CN 202220899530 U CN202220899530 U CN 202220899530U CN 216922368 U CN216922368 U CN 216922368U
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- resistance bridge
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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 discloses a blade deformation detection circuit of a wind power supply system, which comprises a controller, a power supply circuit, a high-speed WiFi circuit and a resistance bridge input circuit, wherein the power supply circuit and the high-speed WiFi circuit are connected in parallel at one side of the controller, both the power supply circuit and the high-speed WiFi circuit are connected with the controller, the resistance bridge input circuit is connected at the other side of the controller, and the resistance bridge input circuit is connected with the controller through an A/D (analog/digital) conversion circuit. Has the beneficial effects that: the circuit interface is simple, and can complete the task of detecting the deformation of the blade. The circuit has the advantages that alternating current components in direct current voltage are suppressed, undesirable harmonic waves are avoided being generated in use, the static working point is effectively stabilized, when voltages of two input ends of the circuit are different, output voltages are changed, differential mode signals are amplified finally, common mode signals are suppressed, and the zero drift phenomenon existing in a common direct coupling amplifying circuit can be suppressed.
Description
Technical Field
The utility model relates to a blade deformation detection circuit, in particular to a blade deformation detection circuit of a wind power supply system.
Background
At present, a wind power supply system adopts a technology of converting wind energy into electric energy by adopting an electromechanical energy conversion device, and the principle of the wind power supply system is that natural wind blows and rotates blades to drive a rotor of a generator to rotate so as to generate electric energy, wherein the blades are used as key parts of the power supply system and directly play a role in energy conversion. Because the working conditions of the blades are often very harsh, in some cases, the damage of the blades is not found or processed in time, so that the accident is expanded to the whole unit, and the generator set cannot normally run.
Since the safety of the blade is critical to the overall reliability of the wind power supply system, it is necessary to detect and evaluate various state parameters (such as vibration parameters, stress, strain, blade tip displacement, etc.) of the blade during operation. The factors influencing the state parameters of the rotating blades mainly comprise the working states of the blades, such as the rotating speed of an impeller, conversion power and the like, when a wind wheel rotates, the blades are under the action of centrifugal force and pneumatic force, the centrifugal force is a pulling force on the blades, the blades are bent by the pneumatic force, and when the wind speed is higher than the designed wind speed of a wind turbine, the pneumatic force exceeds the bearing capacity of the blades and damages the blades; the external environment of the blade, i.e. the ambient temperature, the self-excited vibration of the blade caused by the impact of sand and dust or other foreign objects, and the vibration of the blade caused by various other factors, such as the abrasion of impurities in the steam flow, the electrochemical corrosion of wet steam or the oxidation and corrosion of high-temperature fuel gas. The most intuitive manifestation of the effect of the above factors on the operating conditions of rotating blades is to cause blade deformation, which in turn leads to blade fracture, failure, or other forms of damage. Whether the blade is deformed or not and whether the deformation is within the allowable range of normal work or not are the most intuitive basis for judging the safety of the blade, so that the deformation detection of the blade is a direct mode for evaluating the stability of the blade. Therefore, it is meaningful to research the stability and safety of power supply by researching the blade deformation detection of the wind power supply system while the wind wheel rotates.
Disclosure of Invention
The utility model aims to solve the problems of the existing blade deformation detection circuit in the using process, and provides a blade deformation detection circuit of a wind power supply system.
The utility model provides a blade deformation detection circuit of a wind power supply system, which comprises a controller, a power supply circuit, a high-speed WiFi circuit and a resistance bridge input circuit, wherein the power supply circuit and the high-speed WiFi circuit are connected in parallel on one side of the controller, the power supply circuit and the high-speed WiFi circuit are both connected with the controller, the resistance bridge input circuit is connected on the other side of the controller, and the resistance bridge input circuit is connected with the controller through an A/D (analog/digital) conversion circuit.
The model of the controller is STM32F103C8T6, the program storage capacity in the controller is 64KB, the working voltage of the controller is 2V-3.6V, the working temperature of the controller is-40 ℃ to 85 ℃, and the controller can complete the task of detecting the deformation of the blade.
The power supply circuit is connected with the controller through two lines, a rectifying circuit, a DC/DC circuit and a negative voltage reduction ripple circuit are sequentially connected in series on one line, and a positive voltage reduction ripple circuit is arranged on the other line connected with the controller.
And a fault alarm circuit and a fault display circuit are assembled on a line connecting the high-speed WiFi circuit and the controller.
The resistance bridge input circuit is equipped with four and divide into two sets ofly, two resistance bridge input circuit group become one set ofly, two resistance bridge input circuit of every group connect in parallel after be connected with AD converting circuit behind the differential amplification circuit, differential amplification circuit is connected with AD converting circuit through two circuits, be equipped with filter circuit respectively on two circuits that differential amplification circuit and AD converting circuit are connected, two filter circuit are parallelly connected, resistance bridge input circuit comprises resistance foil gage.
The A/D conversion circuit is also connected with a voltage reference circuit and a resistance bridge power circuit.
The working principle of the utility model is as follows:
the blade deformation detection circuit of the wind power supply system provided by the utility model adopts a resistance bridge input circuit consisting of resistance strain gauges to detect the deformation condition of the blade, the resistance strain gauges forming the resistance bridge input circuit are attached to the surface of the blade, and when the blade is mechanically deformed under the action of external force, the blade is stretched along with the deformation of the blade, so that the metal foil inside the blade is stretched and shortened along with the strain, therefore, the change of the strain can be obtained by measuring the change of the resistance strain gauges, and the following formula is a relational formula of the strain and the resistance.
ΔR＝K×ε
R
Where R is the strain gauge original resistance value, Δ R is the resistance change due to extension or contraction, K is the proportionality constant (strain gauge constant), and ε is the strain.
After obtaining the strain signal, the signal is amplified by the differential amplifying circuit to avoid the zero drift phenomenon, then the signal is filtered by the filter circuit to filter out the pulsating alternating current component to smooth the signal waveform, and then the signal is sent to the A/D conversion circuit, and the A/D conversion circuit converts the analog signal into a digital signal and transmits the digital signal to the controller. According to the utility model, the high-speed WiFi circuit is used for communication, the digital signal in the controller is sent to the fault alarm circuit, when the signal exceeds a set certain value, the deformation condition of the blade is beyond the range capable of being normally used, and an alarm signal is sent out, so that the system fault caused by the deformation of the blade is avoided, and the unnecessary loss is avoided.
The utility model has the beneficial effects that:
the blade deformation detection circuit of the wind power supply system provided by the utility model adopts the chip of the STM32F103C8T6 as a rotary blade deformation detection circuit designed by the controller, the circuit interface is simple, and the task of blade deformation detection can be completed.
The positive voltage reduction ripple circuit and the negative voltage reduction ripple circuit are assembled on a connecting line of the power circuit, the controller and the communication part, so that alternating current components in direct current voltage are restrained, and unexpected harmonic waves are prevented from being generated in use, or equipment is prevented from being burnt due to surge voltage or current.
The utility model utilizes the strain gauge to detect the deformation condition of the blade, measures the deformation signal of the blade through the resistance change of the input circuit of the resistance bridge, processes the acquired signal and transmits the processed signal to the controller, and alarms when the fault alarm module receives a value exceeding a certain value. The processing circuit is also provided with a differential amplifying circuit, the static working point is effectively stabilized by utilizing the symmetry and negative feedback action of circuit parameters, when the voltages of two input ends of the circuit are different, the output voltage changes, the differential mode signal is finally amplified, the common mode signal is inhibited, and the zero drift phenomenon of the common direct coupling amplifying circuit can be inhibited.
Drawings
Fig. 1 is a schematic view of the overall structure of the blade deformation detection circuit according to the present invention.
The labels in the above figures are as follows:
1. controller 2, power supply circuit 3, high-speed WiFi circuit 4, resistance bridge input circuit
5. A/D conversion circuit 6, rectification circuit 7, DC/DC circuit 8, and negative voltage ripple reduction circuit
9. Positive voltage reduction ripple circuit 10, fault alarm circuit 11, fault display circuit
12. A differential amplifier circuit 13, a filter circuit 14, a voltage reference circuit 15, and a resistance bridge power supply circuit.
Detailed Description
Please refer to fig. 1:
the utility model provides a blade deformation detection circuit of a wind power supply system, which comprises a controller 1, a power circuit 2, a high-speed WiFi circuit 3 and a resistance bridge input circuit 4, wherein the power circuit 2 and the high-speed WiFi circuit 3 are connected in parallel to one side of the controller 1, the power circuit 2 and the high-speed WiFi circuit 3 are both connected with the controller 1, the resistance bridge input circuit 4 is connected to the other side of the controller 1, and the resistance bridge input circuit 4 is connected with the controller 1 through an A/D (analog/digital) conversion circuit 5.
The model of the controller 1 is STM32F103C8T6, the program storage capacity in the controller 1 is 64KB, the working voltage of the controller 1 is 2V-3.6V, the working temperature of the controller 1 is-40 ℃ to 85 ℃, and the controller 1 can complete the task of detecting the deformation of the blade.
The power supply circuit 2 is connected with the controller 1 through two lines, wherein a rectifying circuit 6, a DC/DC circuit 7 and a negative voltage reduction ripple circuit 8 are sequentially connected in series on one line, and a positive voltage reduction ripple circuit 9 is arranged on the other line connected with the power supply circuit 2 and the controller 1.
A fault alarm circuit 10 and a fault display circuit 11 are assembled on a line connecting the high-speed WiFi circuit 3 and the controller 1.
The resistance bridge input circuit 4 is equipped with four and divides into two sets ofly, two resistance bridge input circuit 4 constitute and are a set of, two resistance bridge input circuit 4 of each group are connected in parallel after being connected with A/D converting circuit 5 behind differential amplifier circuit 12, differential amplifier circuit 12 is connected with A/D converting circuit 5 through two circuits, be equipped with filter circuit 13 respectively on two circuits that differential amplifier circuit 12 and A/D converting circuit 5 are connected, two filter circuit 13 are parallelly connected, resistance bridge input circuit 4 comprises resistance foil gage.
The a/D conversion circuit 5 is also connected to a voltage reference circuit 14 and a resistance bridge power supply circuit 15.
The working principle of the utility model is as follows:
the utility model provides a wind power supply system blade deformation detection circuit, which adopts a resistance bridge input circuit 4 consisting of resistance strain gauges to detect the deformation condition of a blade, the resistance strain gauges forming the resistance bridge input circuit 4 are attached to the surface of the blade, when the blade generates mechanical deformation under the action of external force, the blade stretches along with the deformation of the blade, so that a metal foil material in the blade stretches and shortens along with the strain, therefore, the change of the strain can be obtained by measuring the change of the resistance strain gauges, and the following formula is a relation formula of the strain and the resistance:
where R is the strain gauge original resistance value, Δ R is the resistance change due to extension or contraction, K is the proportionality constant (strain gauge constant), and ε is the strain.
After obtaining the strain signal, the differential amplifier circuit 12 amplifies the signal to avoid the zero drift phenomenon, the filter circuit 13 filters the signal to remove the pulsating ac component to smooth the signal waveform, the a/D converter circuit 5 converts the analog signal into a digital signal, and the digital signal is transmitted to the controller 1. According to the utility model, the high-speed WiFi circuit 3 is used for communication, the digital signal in the controller 1 is sent to the fault alarm circuit 10, when the signal exceeds a set value, the condition that the blade is deformed exceeds the range capable of being normally used is indicated, and an alarm signal is sent out, so that unnecessary loss caused by system fault caused by blade deformation is avoided.
Claims (6)
1. A wind power system blade deformation detection circuit is characterized in that: the power supply circuit and the high-speed WiFi circuit are connected in parallel to one side of the controller, the power supply circuit and the high-speed WiFi circuit are connected with the controller, the resistance bridge input circuit is connected to the other side of the controller, and the resistance bridge input circuit is connected with the controller through the A/D conversion circuit.
2. A wind powered system blade deformation detection circuit as claimed in claim 1 characterised in that: the model of the controller is STM32F103C8T6, the program storage capacity in the controller is 64KB, the working voltage of the controller is 2V-3.6V, the working temperature of the controller is-40 ℃ to 85 ℃, and the controller can complete the detection task of blade deformation.
3. A wind powered system blade deformation detection circuit as claimed in claim 1 characterised in that: the power supply circuit is connected with the controller through two lines, wherein a rectifying circuit, a DC/DC circuit and a negative voltage reduction ripple circuit are sequentially connected in series on one line, and a positive voltage reduction ripple circuit is arranged on the other line connected with the controller.
4. A wind powered system blade deformation detection circuit as claimed in claim 1 characterised in that: and a fault alarm circuit and a fault display circuit are assembled on a circuit connecting the high-speed WiFi circuit and the controller.
5. A wind powered system blade deformation detection circuit as claimed in claim 1 characterised in that: the resistance bridge input circuit be equipped with four, divide into two sets ofly, two resistance bridge input circuit group become one set of, two resistance bridge input circuit of every group connect in parallel after be connected with AD converting circuit through differential amplifier circuit, differential amplifier circuit is connected with AD converting circuit through two circuits, be equipped with filter circuit respectively on two circuits that differential amplifier circuit and AD converting circuit are connected, two filter circuit are parallelly connected, resistance bridge input circuit comprises resistance foil gage.
6. A wind power system blade deformation detection circuit according to claim 1, characterised in that: the A/D conversion circuit is also connected with a voltage reference circuit and a resistance bridge power circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220899530.4U CN216922368U (en) | 2022-04-19 | 2022-04-19 | Blade deformation detection circuit of wind power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220899530.4U CN216922368U (en) | 2022-04-19 | 2022-04-19 | Blade deformation detection circuit of wind power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216922368U true CN216922368U (en) | 2022-07-08 |
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ID=82233624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220899530.4U Active CN216922368U (en) | 2022-04-19 | 2022-04-19 | Blade deformation detection circuit of wind power supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216922368U (en) |
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2022
- 2022-04-19 CN CN202220899530.4U patent/CN216922368U/en active Active
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