A wind turbine hoisting object anti-falling protection device

Abstract

The utility model relates to a kind of wind generating set hoisting object anti-falling protection devices, including first limit sensor, second limit sensor, with door, switch drive module, electric control limiting device and relay switch module;The output end of first limit sensor and the output end of second limit sensor are connected respectively to the two input ends of with door, the input end of switch drive module is connected to the output end of with door, the output end of switch drive module is connected to the controlled end of relay switch module, one end of the first normally open contact of relay switch module is connected to commercial power, the other end of the first normally open contact of relay switch module is connected to the power access end of electric control limiting device, one end of the second normally open contact of relay switch module is connected to alternating current high voltage, the other end of the second normally open contact of relay switch module is connected to the power access end of elevator;The utility model can start elevator and remove the position limit of electric control limiting device to fan nacelle cover when there are hooks on two lifting lugs.

Description

Technical Field

[0001] This utility model relates to the technical field of wind turbine hoisting auxiliary devices, specifically to a wind turbine hoisting anti-fall protection device. Background Technology

[0002] In the wind power sector, wind turbines are typically located in open areas such as mountains and coastlines. Equipment maintenance and repair are mostly carried out at high altitudes, often using nacelle cranes for lifting cargo. However, during crane operations, the loading hatch is open, posing a risk of workers falling through and sustaining injuries. Furthermore, wind farms often experience harsh weather conditions, such as cold winters and hot summers, which can cause dizziness, heatstroke, and other health problems for workers, further increasing the likelihood of falls.

[0003] In the existing technology, the nacelle cover of a wind turbine is equipped with two lifting lugs. When lifting the nacelle cover, hooks need to be hung on both lifting lugs. However, if maintenance personnel do not hang both hooks during the lifting process, that is, only hang the hook on one lifting lug, the nacelle cover may fall from a height, posing a safety risk. Utility Model Content

[0004] In order to solve the technical problems in the existing technology, such as the risk of the wind turbine nacelle cover falling from a height when only a hook is attached to one lifting lug for nacelle hoisting, this utility model provides a wind turbine generator set anti-fall protection device.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0006] A wind turbine generator set anti-fall protection device includes a power converter, a power module, a first limit sensor, a second limit sensor, an AND gate, a switch drive module, an electronically controlled limit device, and a relay switch module; wherein, the power converter is an AC-to-DC voltage drop transformer, and the power module is a DC-to-DC voltage drop transformer; the first limit sensor is located on one lifting lug of the wind turbine generator's nacelle cover, and the second limit sensor is located on another lifting lug of the wind turbine generator's nacelle cover;

[0007] The input terminal of the power converter is connected to AC mains power, the output terminal of the power converter is connected to the input terminal of the power module, the output terminal of the power module is connected to the power input terminal of the first limit sensor, the power input terminal of the second limit sensor, the power input terminal of the AND gate and the power input terminal of the switch drive module, and the output terminal of the power converter is connected to the relay power supply terminal of the relay switch module.

[0008] The two input terminals of the AND gate are respectively connected to the output terminals of the first limit sensor and the second limit sensor. The output terminal of the AND gate is connected to the input terminal of the switch drive module. The output terminal of the switch drive module is connected to the controlled terminal of the relay switch module. The relay power supply terminal of the relay switch module is connected to the output terminal of the power converter. One end of the first normally open contact of the relay switch module is connected to the mains power, and the other end of the first normally open contact of the relay switch module is connected to the power input terminal of the electronically controlled limit device. One end of the second normally open contact of the relay switch module is connected to AC high voltage, and the other end of the second normally open contact of the relay switch module is connected to the power input terminal of the hoist. The electronically controlled limit device is used to limit the position of the wind turbine nacelle cover.

[0009] The beneficial effects of this utility model are as follows: By setting a first limit sensor and a second limit sensor on two lifting lugs on the nacelle cover of the wind turbine generator, when both lifting lugs are hooked, both the first limit sensor and the second limit sensor output a high-level voltage signal. The AND gate outputs a high-level voltage signal, which drives the switch drive module to output a high-level control voltage. The high-level control voltage controls the first normally open contact and the second normally open contact of the relay switch module to connect, thereby connecting the power supply to the electric limit device and the hoist. After the electric limit device is powered on, it can release the position restriction on the nacelle cover of the wind turbine. At the same time, the hoist is also powered on and works normally. When only one hook is attached to each of the two lifting lugs, only one of the first and second limit sensors outputs a high-level voltage signal, while the AND gate outputs a low-level voltage signal. This low-level voltage signal cannot drive the switch drive module, which in turn outputs a low-level control voltage. This low-level control voltage cannot control the first and second normally open contacts of the relay switch module to conduct, keeping them open and thus cutting off the power supply to the electrical limit device and the hoist. This keeps the electrical limit device restricting the position of the wind turbine nacelle cover, and the hoist cannot operate. Therefore, this invention allows the hoist to be started and the position restriction of the electrical limit device on the wind turbine nacelle cover to be released only when hooks are attached to both lifting lugs, preventing the safety risk of the wind turbine nacelle cover falling from a height when only one hook is attached to the nacelle during hoisting.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, it also includes a signal amplification module, the power input terminal of which is connected to the output terminal of the power supply module, the input terminal of which is connected to the output terminal of the AND gate, and the output terminal of which is connected to the input terminal of the switch driving module.

[0012] The advantage of adopting the above-mentioned further solution is that by setting a signal amplification module, the driving force of the AND gate's output voltage can be improved.

[0013] Furthermore, the power module includes a voltage regulator chip, a voltage regulator diode, a first diode, and an inductor, wherein the voltage regulator chip is model XL1509-5.0;

[0014] The positive terminal of the Zener diode is connected to the output terminal of the power converter, and the negative terminal of the Zener diode is connected to the input terminal of the voltage regulator chip. The positive terminal of the first diode is grounded, and the negative terminal of the first diode is connected to the power switch output terminal of the voltage regulator chip. One end of the inductor is connected to the power switch output terminal of the voltage regulator chip, and the other end of the inductor is connected to the output terminal of the voltage regulator chip. The output terminal of the voltage regulator chip is respectively connected to the power input terminal of the first limit sensor, the power input terminal of the second limit sensor, the power input terminal of the AND gate, the power input terminal of the signal amplification module, and the power input terminal of the switch driver module.

[0015] The advantage of adopting the above-mentioned further solution is that the circuit is simplified by using the XL1509-5.0 voltage regulator chip for voltage reduction.

[0016] Furthermore, the power module also includes a first capacitor, a second capacitor, and a third capacitor. One end of the first capacitor is connected to the input terminal of the voltage regulator chip, and the other end of the first capacitor is grounded. One end of the second capacitor and the third capacitor are both connected to the output terminal of the voltage regulator chip, and the other ends of the second capacitor and the third capacitor are both grounded.

[0017] The beneficial effect of adopting the above-mentioned further solution is that by setting the first capacitor, the second capacitor, and the third capacitor, capacitors are used to filter both the input and output terminals of the voltage regulator chip, thereby improving the stability of the DC voltage at the input and output terminals of the voltage regulator chip.

[0018] Furthermore, the power module also includes a first resistor and a first light-emitting diode. One end of the first resistor is connected to the output terminal of the voltage regulator chip, the other end of the first resistor is connected to the positive terminal of the first light-emitting diode, and the negative terminal of the first light-emitting diode is grounded.

[0019] The beneficial effect of adopting the above-mentioned further solution is that, by setting a first resistor and a first light-emitting diode, when there is a voltage output at the output terminal of the voltage regulator chip, the first light-emitting diode lights up, thereby enabling the monitoring of the working effect of the voltage regulator chip.

[0020] Furthermore, the signal amplification module includes an operational amplifier, a second resistor, and a third resistor. The non-inverting input of the operational amplifier is connected to the output of the AND gate. One end of the second resistor is connected to the output of the operational amplifier. The other end of the second resistor is connected to both the inverting input of the operational amplifier and one end of the third resistor. The other end of the third resistor is grounded. The output of the operational amplifier is connected to the input of the switch driving module.

[0021] Furthermore, the switch driving module includes a fourth resistor and an optocoupler. One end of the fourth resistor is connected to the output terminal of the operational amplifier, and the other end of the fourth resistor is connected to the positive terminal of the input terminal of the optocoupler. The negative terminal of the input terminal of the optocoupler is grounded. The power input terminal of the optocoupler is connected to the output terminal of the power converter, and the output terminal of the optocoupler is connected to the controlled terminal of the relay switch module.

[0022] The advantage of adopting the above-mentioned further solution is that using optocoupler drive can isolate the input and output voltages, thereby improving the stability of the drive circuit.

[0023] Furthermore, the relay switch module includes a first relay switch unit and a second relay switch unit. The first relay switch unit includes a first controlled terminal, a first relay power supply terminal and a first normally open contact. The second relay switch unit includes a second controlled terminal, a second relay power supply terminal and a second normally open contact.

[0024] The output terminals of the optocoupler are respectively connected to the first controlled terminal and the second controlled terminal, and the output terminals of the power converter are respectively connected to the first relay power terminal and the second relay power terminal.

[0025] Furthermore, multiple electrically controlled limit devices are provided, and each of the multiple electrically controlled limit devices uses an electric push rod.

[0026] The beneficial effect of adopting the above-mentioned further solution is that by setting multiple electronically controlled limit devices, the wind turbine nacelle cover can be stably limited by using multiple electronically controlled limit devices to limit different positions of the wind turbine nacelle cover.

[0027] To solve the above-mentioned technical problems, this utility model also provides a wind turbine hoisting machine, the specific technical contents of which are as follows:

[0028] A wind turbine hoisting machine includes the aforementioned wind turbine generator set anti-fall protection device. Attached Figure Description

[0029] Figure 1 The electrical schematic diagram of a wind turbine generator set anti-fall protection device in this embodiment of the present invention is shown below. Figure 1 ;

[0030] Figure 2 The electrical principle outline of a wind turbine generator set anti-fall protection device according to an embodiment of this utility model is as follows: Figure 2 ;

[0031] Figure 3 This is the circuit diagram of the power supply module;

[0032] Figure 4 This is the circuit diagram of the signal amplification module;

[0033] Figure 5 This is a circuit diagram showing the connection between the switch driver module and the first relay switch module.

[0034] Figure 6 This is a circuit diagram showing the connection between the switch driver module and the second relay switch module.

[0035] Figure 7 This is a schematic diagram showing the installation of the first limit sensor and the second limit sensor;

[0036] Figure 8 This is a schematic diagram illustrating the application of the first and second electrically controlled limit devices.

[0037] The attached diagram lists the components represented by each number as follows:

[0038] 1. Power converter; 2. Power module; 3. First limit sensor; 4. Second limit sensor; 5. AND gate; 6. Switch drive module; 7. Relay switch module; 8. Electrically controlled limit device; 9. Hoist; 10. Signal amplification module; 11. First lifting lug; 12. Second lifting lug; 13. First electrically controlled limit device; 14. Second electrically controlled limit device. Detailed Implementation

[0039] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0040] like Figure 1As shown, this embodiment provides a wind turbine generator set anti-fall protection device, including a power converter 1, a power module 2, a first limit sensor 3, a second limit sensor 4, an AND gate 5, a switch drive module 6, an electronically controlled limit device 8, and a relay switch module 7; wherein, the power converter 1 is an AC to DC voltage drop transformer, and the power module 2 is a DC to DC voltage drop transformer; the first limit sensor 3 is located on one lifting lug of the wind turbine generator's nacelle cover, and the second limit sensor 4 is located on another lifting lug of the wind turbine generator's nacelle cover; the power converter 1 is used to convert 220V AC power into 24V DC power, and the power module 2 is used to convert the 24V DC power output by the power converter 1 into 5V DC power.

[0041] The input terminal of power converter 1 is connected to AC mains power, the output terminal of power converter 1 is connected to the input terminal of power module 2, the output terminal of power module 2 is connected to the power input terminal of the first limit sensor 3, the power input terminal of the second limit sensor 4, the power input terminal of AND gate 5 and the power input terminal of switch drive module 6 respectively, and the output terminal of power converter 1 is connected to the relay power terminal of relay switch module 7.

[0042] The two input terminals of AND gate 5 are respectively connected to the output terminals of the first limit sensor 3 and the second limit sensor 4. The output terminal of AND gate 5 is connected to the input terminal of switch drive module 6. The output terminal of switch drive module 6 is connected to the controlled terminal of relay switch module 7. The relay power supply terminal of relay switch module 7 is connected to the output terminal of power converter 1. One end of the first normally open contact of relay switch module 7 is connected to the mains power. The other end of the first normally open contact of relay switch module 7 is connected to the power input terminal of electric limit device 8. One end of the second normally open contact of relay switch module 7 is connected to AC high voltage power. The other end of the second normally open contact of relay switch module 7 is connected to the power input terminal of hoist 9. Electric limit device 8 is used to limit the position of the wind turbine nacelle cover.

[0043] In this embodiment of the invention, a first limit sensor 3 and a second limit sensor 4 are respectively installed on two lifting lugs on the nacelle cover of the wind turbine generator. When both lifting lugs are hooked, the first limit sensor 3 and the second limit sensor 4 output high-level voltage signals. AND gate 5 outputs a high-level voltage signal, which drives the switch drive module 6 to output a high-level control voltage. The high-level control voltage controls the first normally open contact and the second normally open contact of the relay switch module 7 to close, thereby connecting the power supply to the electric limit device 8 and the hoist 9. After the electric limit device 8 is energized, it can release the position restriction on the nacelle cover of the wind turbine. At the same time, the hoist 9 is also energized and works normally. When only one hook is attached to each of the two lifting lugs, only one of the first limit sensor 3 and the second limit sensor 4 outputs a high-level voltage signal, while AND gate 5 outputs a low-level voltage signal. The low-level voltage signal output by AND gate 5 cannot drive the switch drive module 6, and the switch drive module 6 outputs a low-level control voltage. The low-level control voltage cannot control the first and second normally open contacts of the relay switch module 7 to conduct, and the first and second normally open contacts remain open, thereby keeping the power supply to the electronic limit device 8 and the hoist 9 disconnected. This keeps the electronic limit device 8 restricting the position of the wind turbine nacelle cover, and the hoist 9 cannot work. Therefore, this invention can only start the hoist 9 and release the position restriction of the electronic limit device 8 on the wind turbine nacelle cover when hooks are attached to both lifting lugs, preventing the safety risk of the wind turbine nacelle cover falling from a height when only one hook is attached to the nacelle for hoisting.

[0044] like Figure 2 As shown, in some embodiments, the wind turbine generator set falling protection device further includes a signal amplification module 10. The power input terminal of the signal amplification module 10 is connected to the output terminal of the power module 2, the input terminal of the signal amplification module 10 is connected to the output terminal of the AND gate 5, and the output terminal of the signal amplification module 10 is connected to the input terminal of the switch drive module 6. By setting the signal amplification module 10, the driving force of the output voltage of the AND gate can be increased.

[0045] like Figure 3 As shown, the power module 2 includes a voltage regulator chip U1, a voltage regulator diode D1, a first diode D2, and an inductor L1. The voltage regulator chip U1 is of model XL1509-5.0. The output terminal FEEDBACK of the XL1509-5.0 voltage regulator chip U1 outputs a 5V DC voltage.

[0046] The anode of Zener diode D1 is connected to the output terminal of power converter 1, and the cathode of Zener diode D1 is connected to the input terminal VIN of voltage regulator chip U1. The anode of first diode D2 is grounded, and the cathode of first diode D2 is connected to the power switch output terminal OUTPUT of voltage regulator chip U1. One end of inductor L1 is connected to the power switch output terminal OUTPUT of voltage regulator chip U1, and the other end of inductor L1 is connected to the output terminal FEEDBACK of voltage regulator chip U1. The output terminal FEEDBACK of voltage regulator chip U1 is connected to the power input terminals of the first limit sensor 3, the second limit sensor 4, the AND gate 5, the signal amplification module 10, and the switch drive module 6, respectively. By using XL1509-5.0 voltage regulator chip U1 for step-down, the circuit structure is simplified.

[0047] In some embodiments, the power supply module 2 further includes a first capacitor C1, a second capacitor C2, and a third capacitor C3. One end of the first capacitor C1 is connected to the input terminal VIN of the voltage regulator chip U1, and the other end of the first capacitor C1 is grounded. One end of the second capacitor C2 and the third capacitor C3 are both connected to the output terminal FEEDBACK of the voltage regulator chip U1, and the other ends of the second capacitor C2 and the third capacitor C3 are both grounded. By setting the first capacitor C1, the second capacitor C2, and the third capacitor C3, capacitors are used to filter both the input and output terminals of the voltage regulator chip U1, thereby improving the stability of the DC voltage at the input and output terminals of the voltage regulator chip U1.

[0048] In some embodiments, the power module 2 further includes a first resistor R1 and a first light-emitting diode D3. One end of the first resistor R1 is connected to the output terminal FEEDBACK of the voltage regulator chip U1, and the other end of the first resistor R1 is connected to the positive terminal of the first light-emitting diode D3. The negative terminal of the first light-emitting diode D3 is grounded. By setting the first resistor R1 and the first light-emitting diode D3, when there is a voltage output at the output terminal of the voltage regulator chip U1, the first light-emitting diode D3 lights up, thereby enabling monitoring of the working effect of the voltage regulator chip U1.

[0049] like Figure 4 As shown, the signal amplification module 10 includes an operational amplifier U2, a second resistor R2, and a third resistor R3. The non-inverting input of the operational amplifier U2 is connected to the output of the AND gate 5. One end of the second resistor R2 is connected to the output of the operational amplifier U2. The other end of the second resistor R2 is connected to the inverting input of the operational amplifier U2 and one end of the third resistor R3. The other end of the third resistor R3 is grounded. The output of the operational amplifier U2 is connected to the input of the switch driving module 6.

[0050] The output voltage of operational amplifier U2 is Vout = 1 + (R2 / R3)Vin, where Vin represents the voltage at the non-inverting input of operational amplifier U2.

[0051] like Figure 5 As shown, the switch driver module 6 includes a fourth resistor R4 and an optocoupler U3. One end of the fourth resistor R4 is connected to the output terminal of the operational amplifier U2, and the other end of the fourth resistor R4 is connected to the positive terminal of the input terminal of the optocoupler U3. The negative terminal of the input terminal of the optocoupler U3 is grounded. The power input terminal of the optocoupler U3 is connected to the output terminal of the power converter 1, and the output terminal of the optocoupler U3 is connected to the controlled terminal of the relay switch module 7. Using an optocoupler driver provides voltage isolation between the input and output, improving the stability of the drive circuit. When the positive terminal of the optocoupler U3 is at a high level, the internal phototransistor of the optocoupler U3 is turned on, and the output terminal of the optocoupler U3 outputs a 5V voltage.

[0052] In some embodiments, the relay switch module 7 includes a first relay switch unit and a second relay switch unit. The first relay switch unit includes a first controlled terminal, a first relay power supply terminal and a first normally open contact. The second relay switch unit includes a second controlled terminal, a second relay power supply terminal and a second normally open contact.

[0053] The output terminals of optocoupler U3 are connected to the first controlled terminal and the second controlled terminal respectively, and the output terminals of power converter 1 are connected to the first relay power terminal and the second relay power terminal respectively.

[0054] like Figure 5 As shown, the first relay switch unit includes a fifth resistor R5, a first MOSFET Q1, a second LED D4, a first relay K1, and a sixth resistor R6. One end of the fifth resistor R5 is connected to the output terminal of the optocoupler R5, and the other end of the fifth resistor R5 is connected to the gate of the first MOSFET Q1. The source of the first MOSFET Q1 is connected to the 24V power supply voltage output by the power converter 1. The drain of the first MOSFET Q1 is connected to the positive terminal of the second LED D4 and one end of the coil of the first relay K1. The other end of the coil of the first relay K1 is connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 and the negative terminal of the second LED D4 are both grounded. One end of the first normally open contact of the first relay K1 is connected to the 380V AC bus, and the other end of the first normally open contact of the first relay K1 is connected to the power input terminal of the hoist 9.

[0055] When optocoupler U3 is turned on, optocoupler U3 outputs 5V voltage, the first MOSFET Q1 is turned on, the relay coil of the first relay K1 is energized, and the first normally open contact of the first relay K1 is turned on. There can be four first normally open contacts, and the four first normally open contacts are respectively connected to phase A, phase B, phase C, and phase N of the 380V AC bus.

[0056] like Figure 6As shown, in some embodiments, the second relay switch unit includes a seventh resistor R7, a second MOSFET Q2, a third LED D5, a second relay K2, and an eighth resistor R8; one end of the seventh resistor R7 is connected to the output terminal of the optocoupler R5, and the other end of the seventh resistor R7 is connected to the gate of the second MOSFET Q2. The source of the second MOSFET Q2 is connected to the 24V power supply voltage output by the power converter 1. The drain of the second MOSFET Q2 is connected to the positive terminal of the third LED D5 and one end of the coil of the second relay K2. The other end of the coil of the second relay K2 is connected to one end of the eighth resistor R8. The other end of the eighth resistor R8 and the negative terminal of the third LED D5 are both grounded. One end of the second normally open contact of the second relay K2 is connected to the 220V AC bus, and the other end of the second normally open contact of the second relay K2 is connected to the power input terminal of the electronically controlled limit device 8.

[0057] When optocoupler U3 is turned on, it outputs a 5V voltage, the second MOSFET Q2 turns on, the relay coil of the second relay K2 is energized, and the second normally open contact of the second relay K2 is turned on. There can be two second normally open contacts, which are respectively connected to the L phase and N phase of the 220V AC bus.

[0058] like Figure 7 As shown, a first limit sensor 3 is mounted on a first lifting lug 11, and a second limit sensor 4 is mounted on a second lifting lug 12. Both the first limit sensor 3 and the second limit sensor 4 are through-beam photoelectric sensors. The transmitter and receiver of the first limit sensor 3 are respectively embedded in the inner ring of the lifting ring of the first lifting lug 11, so that the transmitter and receiver of the first limit sensor 3 form an through-beam position relationship within the inner ring of the lifting ring of the first lifting lug 11. The transmitter and receiver of the second limit sensor 4 are respectively embedded in the inner ring of the lifting ring of the second lifting lug 12, so that the transmitter and receiver of the second limit sensor 4 form an through-beam position relationship within the inner ring of the lifting ring of the second lifting lug 12. When the hook is hooked into the first lifting lug 11, the transmitter and receiver of the first limit sensor 3 are blocked, and the receiver outputs a high-level voltage signal. When the hook is hooked into the second lifting lug 12, the transmitter and receiver of the second limit sensor 4 are blocked, and the receiver outputs a high-level voltage signal.

[0059] like Figure 8Multiple electrically controlled limit devices 8 are provided, each using an electric push rod. These devices individually limit different positions of the wind turbine nacelle cover. Specifically, two electrically controlled limit devices 8 can be provided: a first electrically controlled limit device 13 and a second electrically controlled limit device 14. Both devices are preferably electric push rods. These devices are fixedly installed on the wind turbine. After their extension rods are extended, they abut or contact the wind turbine nacelle cover to limit its position. Only by having two electrically controlled limit devices 8 each limit different positions of the wind turbine nacelle cover can the cover be stably restricted.

[0060] The power supply terminals of the drive motors of the first electronically controlled limit device 13 and the second electronically controlled limit device 14 are both controlled by the second normally open contact of the second relay K2 to switch the power supply on and off.

[0061] In some other embodiments, a wind turbine hoisting machine is also provided, including the aforementioned wind turbine generator set anti-fall protection device. This wind turbine hoisting machine uses the aforementioned wind turbine generator set anti-fall protection device to control the on / off of power supply to the wind turbine hoisting machine.

[0062] It should be noted that the connection in this utility model is specifically an electrical connection via a wire or a conductor.

[0063] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the concept and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wind turbine hoist fall arrest device, characterized by: The system includes a power converter (1), a power module (2), a first limit sensor (3), a second limit sensor (4), an AND gate (5), a switch drive module (6), an electronically controlled limit device (8), and a relay switch module (7); wherein, the power converter (1) is an AC to DC voltage drop transformer, and the power module (2) is a DC to DC voltage drop transformer; the first limit sensor (3) is located on one lug of the nacelle cover of the wind turbine generator, and the second limit sensor (4) is located on another lug of the nacelle cover of the wind turbine generator; The input terminal of the power converter (1) is connected to AC mains power, the output terminal of the power converter (1) is connected to the input terminal of the power module (2), the output terminal of the power module (2) is connected to the power input terminal of the first limit sensor (3), the power input terminal of the second limit sensor (4), the power input terminal of the AND gate (5) and the power input terminal of the switch drive module (6), and the output terminal of the power converter (1) is connected to the relay power terminal of the relay switch module (7). The two input terminals of the AND gate (5) are respectively connected to the output terminals of the first limit sensor (3) and the second limit sensor (4). The output terminal of the AND gate (5) is connected to the input terminal of the switch drive module (6). The output terminal of the switch drive module (6) is connected to the controlled terminal of the relay switch module (7). The relay power supply terminal of the relay switch module (7) is connected to the output terminal of the power converter (1). One end of the first normally open contact of the relay switch module (7) is connected to the mains power. The other end of the first normally open contact of the relay switch module (7) is connected to the power input terminal of the electric control limit device (8). One end of the second normally open contact of the relay switch module (7) is connected to AC high voltage. The other end of the second normally open contact of the relay switch module (7) is connected to the power input terminal of the hoist (9). The electric control limit device (8) is used to limit the position of the wind turbine nacelle cover.

2. The wind turbine generator set anti-fall protection device according to claim 1, characterized in that: It also includes a signal amplification module (10), the power input terminal of which is connected to the output terminal of the power module (2), the input terminal of which is connected to the output terminal of the AND gate (5), and the output terminal of which is connected to the input terminal of the switch driving module (6).

3. The wind turbine generator set load-lowering protection device according to claim 2, characterized in that: The power module (2) includes a voltage regulator chip (U1), a voltage regulator diode (D1), a first diode (D2), and an inductor (L1), wherein the voltage regulator chip (U1) is of model XL1509-5.0; The positive terminal of the Zener diode (D1) is connected to the output terminal of the power converter (1), and the negative terminal of the Zener diode (D1) is connected to the input terminal of the voltage regulator chip (U1). The positive terminal of the first diode (D2) is grounded, and the negative terminal of the first diode (D2) is connected to the power switch output terminal of the voltage regulator chip (U1). One end of the inductor (L1) is connected to the power switch output terminal of the voltage regulator chip (U1), and the other end of the inductor (L1) is connected to the output terminal of the voltage regulator chip (U1). The output terminal of the voltage regulator chip (U1) is connected to the power input terminal of the first limit sensor (3), the power input terminal of the second limit sensor (4), the power input terminal of the AND gate (5), the power input terminal of the signal amplification module (10), and the power input terminal of the switch drive module (6), respectively.

4. The wind turbine generator set load-lowering protection device according to claim 3, characterized in that: The power module (2) further includes a first capacitor (C1), a second capacitor (C2), and a third capacitor (C3). One end of the first capacitor (C1) is connected to the input terminal of the voltage regulator chip (U1), and the other end of the first capacitor (C1) is grounded. One end of the second capacitor (C2) and the third capacitor (C3) are both connected to the output terminal of the voltage regulator chip (U1), and the other ends of the second capacitor (C2) and the third capacitor (C3) are both grounded.

5. The wind turbine generator set load-lowering protection device according to claim 3, characterized in that: The power module (2) further includes a first resistor (R1) and a first light-emitting diode (D3). One end of the first resistor (R1) is connected to the output terminal of the voltage regulator chip (U1), and the other end of the first resistor (R1) is connected to the positive terminal of the first light-emitting diode (D3). The negative terminal of the first light-emitting diode (D3) is grounded.

6. The wind turbine generator set load-lowering protection device according to claim 2, characterized in that: The signal amplification module (10) includes an operational amplifier (U2), a second resistor (R2), and a third resistor (R3). The non-inverting input of the operational amplifier (U2) is connected to the output of the AND gate (5). One end of the second resistor (R2) is connected to the output of the operational amplifier (U2). The other end of the second resistor (R2) is connected to the inverting input of the operational amplifier (U2) and one end of the third resistor (R3). The other end of the third resistor (R3) is grounded. The output of the operational amplifier (U2) is connected to the input of the switch driving module (6).

7. The wind turbine generator set load-lowering protection device according to claim 6, characterized in that: The switch drive module (6) includes a fourth resistor (R4) and an optocoupler (U3). One end of the fourth resistor (R4) is connected to the output terminal of the operational amplifier (U2), and the other end of the fourth resistor (R4) is connected to the positive terminal of the input terminal of the optocoupler (U3). The negative terminal of the input terminal of the optocoupler (U3) is grounded. The power input terminal of the optocoupler (U3) is connected to the output terminal of the power converter (1), and the output terminal of the optocoupler (U3) is connected to the controlled terminal of the relay switch module (7).

8. The wind turbine generator set load-lowering protection device according to claim 7, characterized in that: The relay switch module (7) includes a first relay switch unit and a second relay switch unit. The first relay switch unit includes a first controlled terminal, a first relay power supply terminal and a first normally open contact. The second relay switch unit includes a second controlled terminal, a second relay power supply terminal and a second normally open contact. The output terminals of the optocoupler (U3) are respectively connected to the first controlled terminal and the second controlled terminal, and the output terminals of the power converter (1) are respectively connected to the first relay power terminal and the second relay power terminal.

9. The wind turbine generator set load-lowering protection device according to claim 1, characterized in that: The electric limit device (8) is provided in multiple ways, and all of the electric limit devices (8) are electric push rods.

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