A wind turbine generator safety chain protection system

Abstract

The application discloses a wind turbine safety chain protection system, wherein the input end of a first AND gate circuit is connected with the output end of a first detector, the output end of a second detector, the output end of a fourth detector and the output end of a fifth detector; the output end of the first AND gate circuit and the output end of a third detector are connected with the input end of a second AND gate circuit; the output end of the second AND gate circuit is connected with the control end of a frequency converter safety system; the input end of a third AND gate circuit is connected with the output end of the third detector, the tower bottom emergency stop button, the cabin emergency stop button, the vibration switch, the cable torsion switch and the Profibus_ok Plc emergency stop requirement signal input end in the wind turbine safety chain; the output end of the third AND gate circuit is connected with the control end of a variable pitch system and the yaw system enabling signal end; and the system can ensure the safe shutdown of the wind turbine under emergency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of wind power generation, and relates to a wind turbine generator system safety chain protection system. BACKGROUND

[0002] The safety and reliability of a wind turbine generator control system is not only related to whether the wind turbine generator can generate electricity normally, but also affects the long-term safe and reliable operation of a wind farm. A large wind turbine generator improves the reliability of the control system as much as possible through safety design of the control system and necessary means, so that the system can be repaired as soon as possible to restore normal work after a fault occurs.

[0003] For a wind turbine generator protection system, there are three protection levels, as shown in the following table. Figure 1

[0004] The first level is a normal protection level (normal shutdown), the wind turbine generator executes a normal shutdown program when such an event occurs; the second level is a fast protection level (fast shutdown), the system executes a fast shutdown program when such an event occurs; and the third level is an emergency protection level (emergency shutdown), the system starts an emergency shutdown program when such an event occurs. Among them, if the system is detected to be normal after the first and second levels of protection occur, the wind turbine generator can be automatically started (self-reset), but if the third level of protection occurs, the system cannot be automatically started, and manual reset of the safety chain loop is required to restart the system.

[0005] The emergency protection level is the safety chain system protection. The wind turbine generator safety chain is a software and hardware protection measure independent of the computer system, and in the design, a reverse logic design is adopted, and fault nodes that may cause serious damage to the wind turbine generator are connected in series into a loop. Once one of the nodes acts, the entire loop will be powered off, the wind turbine generator enters an emergency shutdown process, and the main control system and the variable flow system are in a locked state. If the fault node cannot be recovered, the normal operation of the entire wind turbine generator cannot be realized. At the same time, the safety chain is also the last protection of the entire wind turbine generator, which is after the software protection of the wind turbine generator. SUMMARY

[0006] The purpose of the present application is to overcome the above-mentioned shortcomings of the prior art, and to provide a wind turbine generator safety chain protection system, which can ensure safe shutdown of the wind turbine generator in an emergency.

[0007] ​In order to achieve the above-mentioned purpose, the wind turbine safety chain protection system comprises a first AND gate circuit, a second AND gate circuit, a third AND gate circuit, a frequency converter safety system, a control end of a variable pitch system, a yaw system enable signal end, a first detector for detecting whether the impeller is overspeed, a second detector for detecting whether the generator is overspeed, a third detector for detecting whether the wind turbine enters an emergency shutdown state, a fourth detector for detecting a variable pitch frequency converter OK signal, and a fifth detector for detecting the state of a watchdog switch in the wind turbine safety chain, wherein the input end of the first AND gate circuit is connected with the output end of the first detector, the output end of the second detector, the output end of the fourth detector and the output end of the fifth detector, the output end of the first AND gate circuit and the output end of the third detector are connected with the input end of the second AND gate circuit, and the output end of the second AND gate circuit is connected with the control end of the frequency converter safety system.

[0008] The input end of the third AND gate circuit is connected with the output end of the third detector and the input end of a tower bottom emergency stop button, a nacelle emergency stop button, a vibration switch, a cable twist switch and a Profibus_ok Plc emergency stop request signal in the wind turbine safety chain, and the output end of the third AND gate circuit is connected with the control end of the variable pitch system and the yaw system enable signal end.

[0009] Further comprising a reset system for resetting the first AND gate circuit and the third AND gate circuit.

[0010] The reset system comprises a fourth AND gate circuit, a tower bottom reset button, a software reset signal input end and a nacelle reset button, wherein the input end of the fourth AND gate circuit is connected with the tower bottom reset button, the software reset signal input end and the nacelle reset button, and the output end of the fourth AND gate circuit is connected with the reset end of the first AND gate circuit and the reset end of the third AND gate circuit.

[0011] The wind turbine safety chain protection system has the following beneficial effects:

[0012] In the specific operation of the wind turbine safety chain protection system, the state of each component in the wind turbine safety chain is judged, the AND operation is performed through the AND gate circuit, the frequency converter safety system, the variable pitch system and the yaw system are controlled according to the operation result, and the safe shutdown of the wind turbine in the emergency is ensured, so that the structure is simple, the operation is convenient, and the practicability is extremely strong. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the wind turbine safety chain;

[0014] Figure 2 It is a structural schematic diagram of the variable pitch system safety chain;

[0015] Figure 3 It is a structural schematic diagram of the reset system in the application.

[0016] Figure 4 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0017] The present invention is described in further detail below with reference to the accompanying drawings:

[0018] 1. Wind turbine safety chain

[0019] refer to Figure 1 The wind turbine safety chain includes the emergency stop button (tower base main control cabinet and nacelle control cabinet), the impeller overspeed module, the generator overspeed module, the twist cable switch, the signal from the pitch system safety chain, the vibration switch, the watchdog switch, the safety chain signal to the pitch system, the safety chain signal to the yaw controller and the bus OK signal.

[0020] The nodes of each unit in the safety chain system are connected in series to form a loop. Any actuation of any node will cause the entire loop to lose power. If a generator overspeed fault occurs, the overspeed fault node will quickly change from closed to open, causing the entire safety chain circuit to lose power, the unit to enter emergency shutdown, and the main control system safety chain, converter system safety chain, yaw system safety chain, and pitch control safety chain to lose power and lock.

[0021] 2. Pitch system safety chain

[0022] refer to Figure 2 The pitch system affects the safety chain of the main control system through the contacts of the K4 relay in each pitch cabinet, while the safety chain of the main control system affects the pitch system through the coil of the K7 relay in each pitch cabinet. The safety chain of the pitch system and the safety chain of the main control system are independent of each other but affect each other.

[0023] During operation, if a node in the main control system's safety chain is disconnected, the coil of relay 115K3, which connects the safety chain to the pitch control system, loses power and its contacts open. The coil of relay K7 in each pitch control cabinet also opens, and the pitch control system enters emergency shutdown mode, rapidly feathering the blades 90°. If a fault occurs in the pitch control system (such as loss of the pitch inverter OK signal or activation of the 90-degree limit switch), the system cuts power to relay K4, opening its contacts and de-energizing the coil of relay 115K7 in the safety chain from the pitch control system. This disconnects the entire safety chain of the main control system. Simultaneously, the coil of relay 115K3, which connects the safety chain to the pitch control system, loses power and its contacts open. The coil of relay K7 in each pitch control cabinet also opens, and the control systems of the blades in the pitch control system that are not experiencing a fault enter emergency shutdown mode, rapidly feathering the blades 90°. This interconnects the safety chain and provides maximum protection for the turbine.

[0024] refer to Figure 4The wind turbine safety chain protection system comprises a first AND gate circuit FB1, a second AND gate circuit FB2, a third AND gate circuit FB3, a frequency converter safety system, a control end of a variable pitch system, a yaw system enable signal end, a first detector for detecting whether a rotor is overspeed, a second detector for detecting whether a generator is overspeed, a third detector for detecting whether a wind turbine enters an emergency shutdown state, a fourth detector for detecting a variable pitch frequency converter OK signal, and a fifth detector for detecting a watchdog switch state in the wind turbine safety chain, wherein the input end of the first AND gate circuit FB1 is connected with the output end of the first detector, the output end of the second detector, the output end of the fourth detector, and the output end of the fifth detector, the output end of the first AND gate circuit FB1 and the output end of the third detector are connected with the input end of the second AND gate circuit FB2, and the output end of the second AND gate circuit FB2 is connected with the control end of the frequency converter safety system; the input end of the third AND gate circuit FB3 is connected with the output end of the third detector, a tower bottom emergency stop button, a cabin emergency stop button, a vibration switch, a cable torsion switch, and a Profibus_ok Plc emergency stop request signal input end in the wind turbine safety chain, and the output end of the third AND gate circuit FB3 is connected with the control end of the variable pitch system and the yaw system enable signal end. When the second AND gate circuit FB2 outputs a high level, the frequency converter safety system is controlled to start shutdown; when the third AND gate circuit FB2 outputs a high level, the yaw system is controlled to not yaw, and the variable pitch system is controlled to stop.

[0025] Reference Figure 3 The application further comprises a reset system for resetting the first AND gate circuit FB1 and the third AND gate circuit FB3, wherein the reset system comprises a fourth AND gate circuit FB4, a tower bottom reset button 1K1, a software reset signal input end 1K3, and a cabin reset button 1K2, the input end of the fourth AND gate circuit FB4 is connected with the tower bottom reset button 1K1, the software reset signal input end 1K3, and the cabin reset button 1K2, and the output end of the fourth AND gate circuit FB4 is connected with the reset end of the first AND gate circuit FB1 and the reset end of the third AND gate circuit FB3.

[0026] The above description is only a preferred embodiment of the application, and does not limit the application in any form, and the skilled in the art can make some simple modifications, equivalent changes or modifications by using the disclosed technical content, which falls within the protection scope of the application.

Claims

1. A wind turbine safety chain protection system, characterized in that: The wind turbine generator system comprises a first AND gate circuit (FB1), a second AND gate circuit (FB2), a third AND gate circuit (FB3), a frequency converter safety system, a control end of a pitch control system, an enable signal end of a yaw system, a first detector for detecting whether a rotor is overspeeding, a second detector for detecting whether a generator is overspeeding, a third detector for detecting whether a generator set has entered an emergency shutdown state, a fourth detector for detecting an OK signal of a pitch converter, and a fifth detector for detecting a watchdog switch state in a safety chain of a wind turbine generator set, wherein an input end of the first AND gate circuit (FB1) is connected to an output end of the first detector, an output end of the second detector, an output end of the fourth detector, and an output end of the fifth detector, an output end of the first AND gate circuit (FB1) and an output end of the third detector are connected to an input end of the second AND gate circuit (FB2), and an output end of the second AND gate circuit (FB2) is connected to a control end of the frequency converter safety system; The input end of the third AND gate circuit (FB3) is connected to the output end of the third detector and the tower bottom emergency stop button, the cabin emergency stop button, the vibration switch, the twist cable switch and the Profibus_ok PLC emergency stop request signal input end in the wind turbine safety chain, and the output end of the third AND gate circuit (FB3) is connected to the control end of the pitch system and the yaw system enable signal end; Also included is a reset system for resetting the first AND gate circuit (FB1) and the third AND gate circuit (FB3); The reset system comprises a fourth AND gate circuit (FB4), a tower bottom reset button (1K1), a software reset signal input end (1K3) and a cabin reset button (1K2), wherein the input end of the fourth AND gate circuit (FB4) is connected to the tower bottom reset button (1K1), the software reset signal input end (1K3) and the cabin reset button (1K2), and the output end of the fourth AND gate circuit (FB4) is connected to the reset end of the first AND gate circuit (FB1) and the reset end of the third AND gate circuit (FB3); During operation, when a node in the safety chain of the main control system is disconnected, the coil of the relay 115K3 from the safety chain to the pitch loses power, its contacts are disconnected, the coil of the K7 relay in each pitch cabinet loses power and the contacts are disconnected, and the pitch system enters the emergency shutdown mode and quickly 90° feathers. When the pitch system fails, the pitch system cuts off the power supply to the K4 relay, and the contacts of the K4 relay are disconnected, causing the coil of the relay 115K7 from the pitch in the safety chain to lose power, its contacts are disconnected, and the entire safety chain of the main control system is also disconnected. At the same time, the coil of the relay 115K3 from the safety chain to the pitch loses power, its contacts are disconnected, and the coil of the K7 relay in each pitch cabinet loses power and the contacts are disconnected. The control system of the blades without faults in the pitch system enters the emergency shutdown mode and quickly 90° feathers, so that the safety chains are linked together.

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