A wind turbine high speed shaft brake control system and method

Abstract

The application discloses a wind turbine high-speed shaft brake control system and method, which comprises a high-speed shaft brake power supply control loop, a high-speed shaft brake temperature detection control loop, a main control PLC, a safety relay and a rotating speed monitor, wherein the main control remote brake release switch K1 and the main control brake holding switch K4 of the high-speed shaft brake power supply control loop are connected with the main control PLC respectively, the safety relay switch K3 of the high-speed shaft brake power supply control loop is connected with the safety relay, the rotating speed control switch K2 of the high-speed shaft brake power supply control loop is connected with the rotating speed monitor, and the high-speed shaft brake temperature sensor R1 and the cabin temperature sensor R2 of the high-speed shaft brake temperature detection control loop are connected with the temperature acquisition module of the main control PLC respectively. The application can effectively solve the problems of high-speed shaft brake wear, loss of power generation of the unit and even cabin fire caused by the failure of the high-speed shaft brake control loop.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind turbine generators, in particular to a wind turbine generator high-speed shaft brake control system and method. BACKGROUND

[0002] The wind turbine generator high-speed shaft brake, also known as a brake system, is used to ensure that the wind wheel completely stops and the unit safely stops when a major fault occurs in the wind turbine generator or special maintenance is performed. The high-speed shaft brake is generally designed according to the principle of obtaining power, and the control system makes the electromagnetic valve obtain power by the wind turbine in a low speed state, and the high-speed shaft brake brake action. However, in the normal operation of the wind turbine generator, the high-speed shaft brake failure also occurs from time to time. In order to improve the control reliability of the brake system, for example, CN220168417U discloses a wind turbine generator high-speed shaft brake anti-locking electrical interlocking device, which adds a temperature control switch to the high-speed shaft brake. When the high-speed shaft brake fails, the wear generates sparks, and the temperature exceeds the set temperature of the temperature control switch, a feedback disconnection signal is fed back, and the main control receives the signal to perform emergency shutdown to protect the unit safety. The above-mentioned electrical interlocking device has no problem under normal working conditions, but in the case of a wind turbine generator in a typhoon period or a deep sea, once the high-speed shaft brake control loop fails, personnel cannot immediately arrive at the wind turbine for maintenance and repair, which will cause the wind turbine generator high-speed shaft brake to wear, loss of unit power generation, and even cabin fire problems.

[0003] Therefore, the control and protection method of the wind turbine generator high-speed shaft brake needs to be improved to solve the problem of being unable to disconnect the power supply of the electromagnetic valve when the control loop fails. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art and provide a wind turbine generator high-speed shaft brake control system that can effectively solve the problems of high-speed shaft brake wear, loss of unit power generation, and even cabin fire caused by high-speed shaft brake control loop failure.

[0005] Another purpose of the present application is to provide a wind turbine generator high-speed shaft brake control method.

[0006] The purpose of the present application is achieved by the following technical solutions:

[0007] The application discloses a wind turbine high-speed shaft brake control system, which comprises a high-speed shaft brake power supply control loop, a high-speed shaft brake temperature detection control loop, a main control PLC, a safety relay and a rotating speed monitor, wherein the high-speed shaft brake power supply control loop comprises a power supply, a main control remote brake release switch K1, a rotating speed control switch K2, a safety relay switch K3, a main control brake holding switch K4, a high-speed shaft brake electromagnetic valve Y1 and a high-speed shaft brake electromagnetic valve Y2; the input end of the main control remote brake release switch K1 is connected with the power supply; the input end of the rotating speed control switch K2 is connected with the output end of the main control remote brake release switch K1; the safety relay switch K3 and the main control brake holding switch K4 are connected in parallel, and the input ends of the safety relay switch K3 and the main control brake holding switch K4 are connected with the output end of the rotating speed control switch K2; the input end of the high-speed shaft brake electromagnetic valve Y1 is connected with the output ends of the safety relay switch K3 and the main control brake holding switch K4; the output end of the high-speed shaft brake electromagnetic valve Y1 is connected with a 0V power supply; the input end of the high-speed shaft brake electromagnetic valve Y2 is connected with the output ends of the safety relay switch K3 and the main control brake holding switch K4; the output end of the high-speed shaft brake electromagnetic valve Y2 is connected with a 0V power supply; the main control remote brake release switch K1 and the main control brake holding switch K4 are connected with the main control PLC respectively; the closing and opening of the main control remote brake release switch K1 and the main control brake holding switch K4 are controlled by the main control PLC; the safety relay switch K3 is connected with a safety relay; the closing and opening of the safety relay switch K3 are controlled by the safety relay; the rotating speed control switch K2 is connected with the rotating speed monitor; the rotating speed monitor is used for detecting the rotating speed of the fan and controlling the closing and opening of the rotating speed control switch K2 according to the rotating speed; the high-speed shaft brake temperature detection control loop comprises a high-speed shaft brake temperature sensor R1 and a cabin temperature sensor R2; the high-speed shaft brake temperature sensor R1 and the cabin temperature sensor R2 are connected with the temperature acquisition module of the main control PLC respectively; when the high-speed shaft brake fails, the main control PLC compares the temperature of the high-speed shaft brake with the cabin temperature, and then judges whether to issue a stop command.

[0008] Further, the output point DQ1 and the output point DQ2 of the main control PLC respectively output 24VDC power supply to one end of the coil of the main control remote brake release switch K1 and the main control brake holding switch K4; the other end of the main control remote brake release switch K1 and the main control brake holding switch K4 is connected with a 0V power supply; the output end of the safety relay outputs 24VDC power supply to one end of the coil of the safety relay switch K3; the other end of the safety relay switch K3 is connected with a 0V power supply.

[0009] Further, overvoltage protection terminal V1 and overvoltage protection terminal V2 are further included, the output port of the safety relay switch K3 is connected with the protected end one port of the overvoltage protection terminal V1, the output port of the master control brake-on switch K4 is connected with the protected end one port of the overvoltage protection terminal V2, the protected end other port of the overvoltage protection terminal V1 and the overvoltage protection terminal V2 is connected with 0V power supply, the protection port of the overvoltage protection terminal V1 is connected with the high-speed shaft brake electromagnetic valve Y1 through the shielded cable W1, and the protection port of the overvoltage protection terminal V2 is connected with the high-speed shaft brake electromagnetic valve Y2 through the shielded cable W2.

[0010] Further, the series order of the master control remote brake release switch K1, the rotating speed control switch K2, the safety relay switch K3 and the master control brake-on switch K4 can be adjusted according to actual requirements.

[0011] Further, the rotating speed monitor is powered by 24V and has rotating speed setting function, and includes two rotating speed judgment output switches, one of which is used for judging over-speed of the fan to perform emergency shutdown, and the other of which is used for low-speed detection to run the brake-on when the rotating speed is low, the rotating speed control switch K2 is connected with the rotating speed judgment output switch for low-speed detection, and the rotating speed monitor receives the signal of the rotating speed signal generating device of the wind turbine generator set, the rotating speed signal generating device is powered by 24V and includes two wiring, one of which is connected to the rotating speed monitor, and the other of which is connected to the high-speed acquisition rotating speed module of the master control PLC.

[0012] Further, the safety relay is designed by programmable or non-programmable safety relay, the emergency stop button and the auxiliary contact installed on the door of the electrical cabinet in the wind turbine generator set are connected to the input port of the safety relay, the emergency stop button and the auxiliary contact are designed by normally closed, and the emergency stop button body and the auxiliary contact become normally open when the emergency stop button is pressed.

[0013] Further, the high-speed shaft brake temperature sensor R1 is connected to the terminal X4 through the shielded cable W3 and connected to the temperature acquisition module of the master control PLC through the terminal X4, and the cabin temperature sensor R2 is connected to the terminal X5 through the shielded cable W4 and connected to the temperature acquisition module of the master control PLC through the terminal X5.

[0014] Further, the master control remote brake release switch K1, the rotating speed control switch K2, the safety relay switch K3 and the master control brake-on switch K4 are all intermediate relays.

[0015] Further, the high-speed shaft brake temperature sensor R1 and the cabin temperature sensor R2 are both PT100 temperature sensors.

[0016] Another object of the present application is achieved by the following technical scheme.

[0017] A wind turbine high-speed shaft brake control method is realized based on a wind turbine high-speed shaft brake control system, comprising a high-speed shaft brake power supply control part and a high-speed shaft brake temperature detection control part.

[0018] The high-speed shaft brake power supply control part comprises the following steps:

[0019] S1.1, input power supply and pulse output to a speed monitor through a wind turbine speed signal generation device;

[0020] S1.2, calculate the wind turbine speed through the speed monitor, if the unit speed is lower than the allowed brake speed, output a speed control switch K2 closing signal, at this time, the brake condition is met, if the unit speed is greater than the set speed, output a speed control switch K2 opening signal, the high-speed shaft brake is not allowed;

[0021] S1.3, control the safety chain opening and the safety relay switch K3 closing through a safety relay and an emergency stop button of the wind turbine, at this time, the brake condition is met, if the emergency stop button is not triggered, output an opening signal, the high-speed shaft brake is not allowed;

[0022] S1.4, control the main control brake switch K4 closing through the digital output of the main control PLC, at this time, the brake condition is met;

[0023] S1.5, the main control remote brake release switch K1 is in a normally closed state, at this time, the high-speed shaft brake electromagnetic valve Y1 and the high-speed shaft brake electromagnetic valve Y2 are powered on, so that the high-speed shaft brake is released, if the typhoon period or the deep sea unit control circuit fault does not have the sea maintenance reset working condition, control the main control remote brake release switch K1 opening power supply through the digital output of the main control PLC, and the high-speed shaft brake is released;

[0024] The high-speed shaft brake temperature detection control part comprises the following steps,

[0025] S2.1, collect the temperature of the high-speed shaft brake by using a high-speed shaft brake temperature sensor, collect the temperature in the engine room by using an engine room temperature sensor, and transmit to the main control PLC;

[0026] S2.1, when the high-speed shaft brake fails, calculate and judge by the main control PLC, when the temperature difference between the high-speed shaft brake temperature and the engine room temperature is greater than the preset temperature and lasts for a preset time, at this time, the unit is stopped, and the unit automatic reset is prohibited.

[0027] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0028] The application provides a multi-stage cooperation form of speed monitor detection, PT100 temperature detection, safety relay detection, master control PLC judgment, etc., to realize high-speed shaft brake holding and releasing, especially holding in the abnormal state of high-speed shaft brake, and the brake control loop cannot be remotely disconnected, when the personnel of the unit cannot immediately arrive at the unit during the typhoon period or in the deep sea, the high-speed shaft brake can be released through the master control remote release switch K1, which can improve the power generation capacity of the unit and avoid the risk of unit tower falling; at the same time, through the high-speed shaft brake temperature detection control loop, the risk of high-speed shaft brake high temperature and engine room fire is effectively prevented, and the reliability design of the high-speed shaft brake loop of the wind turbine generator system is realized. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The principle schematic diagram of the high-speed shaft brake power supply control loop.

[0030] Figure 2 The principle schematic diagram of the high-speed shaft brake temperature detection control loop.

[0031] Figure 3 The principle schematic diagram of the control source device of the high-speed shaft brake power supply control loop.

[0032] Figure 4 The speed control principle schematic diagram of the high-speed shaft brake power supply control loop.

[0033] Figure 5 The safety relay input principle schematic diagram of the high-speed shaft brake power supply control loop.

[0034] Figure 6 The control flow schematic diagram of the high-speed shaft brake power supply control loop.

[0035] Figure 7 The control flow schematic diagram of the high-speed shaft brake temperature detection control loop. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the application clearer, the technical scheme in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0037] Embodiment 1:

[0038] As Figure 1The embodiment shown provides a wind turbine high-speed shaft brake control system, which comprises a high-speed shaft brake power supply control loop, a high-speed shaft brake temperature detection control loop, a master control PLC, a safety relay and a rotating speed monitor. The high-speed shaft brake power supply control loop comprises a 24V power supply, a master control remote brake release switch K1, a rotating speed control switch K2, a safety relay switch K3, a master control brake holding switch K4, a high-speed shaft brake electromagnetic valve Y1 and a high-speed shaft brake electromagnetic valve Y2. The input end of the master control remote brake release switch K1 is connected with the power supply. The input end of the rotating speed control switch K2 is connected with the output end of the master control remote brake release switch K1. The safety relay switch K3 and the master control brake holding switch K4 are connected in parallel. The input ends of the safety relay switch K3 and the master control brake holding switch K4 are connected with the output end of the rotating speed control switch K2. The input end of the high-speed shaft brake electromagnetic valve Y1 is connected with the output ends of the safety relay switch K3 and the master control brake holding switch K4. The output end of the high-speed shaft brake electromagnetic valve Y1 is connected with a 0V power supply. The input end of the high-speed shaft brake electromagnetic valve Y2 is connected with the output ends of the safety relay switch K3 and the master control brake holding switch K4. The output end of the high-speed shaft brake electromagnetic valve Y2 is connected with a 0V power supply. When the control system is not powered on, the master control remote brake release switch K1 is in a normally closed state, the rotating speed control switch K2 is in a normally open state, the safety relay switch K3 is in a normally closed state, and the master control brake holding switch K4 is in a normally open state. The master control remote brake release switch K1 and the master control brake holding switch K4 are connected with the master control PLC, and the closure and opening of the master control remote brake release switch K1 and the master control brake holding switch K4 are controlled by the master control PLC. The safety relay switch K3 is connected with a safety relay, and the closure and opening of the safety relay switch K3 are controlled by the safety relay. The rotating speed control switch K2 is connected with the rotating speed monitor, and the rotating speed monitor is used for detecting the rotating speed of the fan and controlling the closure and opening of the rotating speed control switch K2 according to the rotating speed. The high-speed shaft brake temperature detection control loop comprises a high-speed shaft brake temperature sensor R1 and a cabin temperature sensor R2. The high-speed shaft brake temperature sensor R1 and the cabin temperature sensor R2 are connected with the temperature acquisition module of the master control PLC. When the high-speed shaft brake appears mechanical failure or the high-speed shaft brake power supply control loop fails under abnormal working conditions, the master control PLC compares the temperature of the high-speed shaft brake with the cabin temperature, and then judges whether to issue a stop command.

[0039] Specifically, it further comprises overvoltage protection terminal V1 and overvoltage protection terminal V2, the output port of the safety relay switch K3 is connected with the protected end port of the overvoltage protection terminal V1, the output port of the main control brake holding switch K4 is connected with the protected end port of the overvoltage protection terminal V2, the other protected end port of the overvoltage protection terminal V1 and the overvoltage protection terminal V2 is connected with the 0V power supply, the protection port of the overvoltage protection terminal V1 is connected with the terminal row X3, the terminal row X3 is connected with the high-speed shaft brake electromagnetic valve Y1 through the shielded cable W1, the protection port of the overvoltage protection terminal V2 is connected with the terminal row, and the terminal row is connected with the high-speed shaft brake electromagnetic valve Y2 through the shielded cable W2; the shielded cable W1 and the shielded cable W2 are connected in the form of single-ended grounding, the impact of the electromagnetic valve reverse electromotive force on the control loop is suppressed through the overvoltage protection terminal, and the aging of the relay contact is prevented.

[0040] As shown in Figure 2 , the high-speed shaft brake temperature sensor R1 is connected to the terminal X4 through the shielded cable W3, and is connected to the temperature acquisition module of the main control PLC through the terminal X4; the cabin temperature sensor R2 is connected to the terminal X5 through the shielded cable W4, and is connected to the temperature acquisition module of the main control PLC through the terminal X5; the shielded cable W3 and the shielded cable W4 are connected in the form of single-ended grounding. The high-speed shaft brake temperature sensor R1 and the cabin temperature sensor R2 are both PT100 temperature sensors, and the number of temperature sensors includes but is not limited to one.

[0041] As shown in Figure 3 , it is the control source device of the high-speed shaft brake power supply control loop, the output point DQ1 and the output point DQ2 of the main control PLC respectively output 24VDC power supply to one end of the coil of the main control remote release switch K1 and the main control brake holding switch K4, the other end of the main control remote release switch K1 and the main control brake holding switch K4 is connected to the 0V power supply, the output end of the safety relay outputs 24VDC power supply to one end of the coil of the safety relay switch K3, and the other end of the safety relay switch K3 is connected to the 0V power supply.

[0042] The series order of the main control remote release switch K1, the speed control switch K2, the safety relay switch K3 and the main control brake holding switch K4 in the embodiment can be adjusted according to actual needs.

[0043] The rotation speed monitor of the embodiment is powered by 24V, has rotation speed setting function, contains two rotation speed judgment output switches, one of which is used for judging over-speed of the fan and performing emergency stop, and the other is used for low-speed detection and running the brake when the rotation speed is low. The rotation speed control switch K2 is connected with the rotation speed judgment output switch for low-speed detection. The rotation speed monitor receives the signal of the rotation speed signal generating device B1 of the wind turbine generator set. The rotation speed signal generating device B1 is a proximity switch or an encoder, is powered by 24V, and contains two wiring lines. One of the wiring lines is connected to the rotation speed monitor, and the other is connected to the high-speed collection rotation speed module of the main control PLC. The main control PLC and the rotation speed monitor are two independent devices and do not affect each other. As shown in Figure 4 , it is the rotation speed control switch K2 and the rotation speed control principle. The rotation speed monitor A1 sets the maximum starting rotation speed. When the rotation speed of the wind turbine generator set is lower than the maximum starting rotation speed set by the rotation speed monitor, the Rel1 channel of the rotation speed monitor A1 outputs a closed signal, and the normally open contact of the rotation speed control switch K2 is closed. When the rotation speed of the wind turbine generator set is greater than the maximum starting rotation speed set by the rotation speed monitor, the Rel1 channel of the rotation speed monitor outputs an open signal, and the normally open contact of the rotation speed control switch K2 remains normally open.

[0044] The safety relay of the embodiment can be designed by programmable or non-programmable safety relay. As shown in Figure 5 , it is the input principle of the safety relay. The emergency stop button S1 and the auxiliary contact installed on the door of the electrical cabinet of the wind turbine generator set are connected to the input port of the safety relay. The emergency stop button S1 and the auxiliary contact are designed as normally closed. When the emergency stop button S1 is pressed, the emergency stop button body and the auxiliary contact become normally open. When the wind turbine generator set is running normally, the emergency stop button S1 remains normally closed, the input signals I1 and I2 of the safety relay remain normally closed, the output 01 of the safety relay remains normally closed, and the switch K3 of the safety relay remains in the open state. When the emergency stop button S1 connected to the input of the safety relay is triggered to open, the normally closed contact of the switch K3 of the safety relay returns to closed.

[0045] The main control remote brake release switch K1 in the embodiment is enabled in some special working conditions, such as during a typhoon or when the control line of the deep-sea generator set fails to have an offshore maintenance reset, etc. The function is managed by password authority on the remote host computer interface. When the function is enabled, the authorized password is input to activate it, and the main control PLC enables the main control remote brake release switch control signal DQ1. The normally closed contact of the main control remote brake release switch K1 becomes normally open, the power supply circuit of the high-speed shaft brake is disconnected, and the high-speed shaft brake is released.

[0046] The main control remote brake release switch K1, the rotation speed control switch K2, the safety relay switch K3, and the main control brake switch K4 in the embodiment are all intermediate relays.

[0047] The way of the control system of the embodiment to brake the high-speed shaft brake includes:

[0048] Method 1, trigger the emergency stop button S1, at this time the safety relay output is disconnected, the safety relay switch K3 contact returns to the normally closed state, and the wind turbine executes the pitch reduction and stops running. When the speed of the wind turbine is lower than the speed monitored by the speed monitor, the speed control switch K2 contact is closed. At this time, the main control remote release switch K1 is not triggered, the power supply circuit is closed, the high-speed shaft brake electromagnetic valve is powered, and the high-speed shaft brake is braked.

[0049] Method 2, when the emergency stop button S1 is not triggered, the safety relay switch K3 contact is normally open. At this time, the high-speed shaft brake can also be controlled by the main control brake switch K4. Specifically, the pulse signal output by the proximity switch B1 is connected to the main control PLC high-speed digital input point FI. The main control PLC calculates the speed according to FI. When the speed of the wind turbine is lower than the set speed, the main control brake switch control signal DQ2 enables the output of 24V, the main control brake switch K4 normally open contact becomes normally closed, the main control remote release switch K1 contact is closed, the speed control switch K2 contact is closed, the high-speed shaft brake electromagnetic valve is powered, and the high-speed shaft brake is braked.

[0050] The conventional release method of the high-speed shaft brake of the wind turbine includes the following:

[0051] When the wind turbine is running normally and the speed of the wind turbine is greater than the set speed of the speed monitor, the Rel1 output is a disconnected signal, the speed control switch K2 connected in the power supply circuit of the high-speed shaft brake electromagnetic valve is normally open, and the high-speed shaft brake electromagnetic valve is not allowed to be powered, that is, the high-speed shaft brake is released. At the same time, when the wind turbine is running normally, the safety relay output is normally closed, and the safety relay switch K3 contact is normally open, so that the high-speed shaft brake electromagnetic valve is not allowed to be powered, that is, the high-speed shaft brake is released.

[0052] After the high-speed shaft brake is braked, the setting process of the reset system is as follows:

[0053] First, the safety relay output circuit needs to be checked, that is, the reset emergency stop button S1 or the emergency stop button fault line. After the emergency stop line is reset, the safety relay switch K3 becomes normally open, the electromagnetic valve power supply circuit is disconnected, and the high-speed shaft brake is released. If the high-speed shaft brake is braked by the main control brake switch K4, when the brake is released, the main control brake switch K4 control signal is disconnected, the main control brake switch K4 contact returns to normally open, the electromagnetic valve power supply circuit is disconnected, and the high-speed shaft brake is released.

[0054] When the high-speed shaft brake fails mechanically or the electrical control loop fails under abnormal working conditions, the main control PLC compares the temperature of the high-speed shaft brake with the temperature in the engine room. When the temperature difference between the high-speed shaft brake and the engine room is greater than 25℃ for 3s, the main control PLC immediately issues a shutdown command, and the unit is prohibited from automatic reset.

[0055] Embodiment 2:

[0056] As shown in Figure 6 , Figure 7 , the embodiment provides a high-speed shaft brake control method for a wind turbine generator set, which is implemented based on the high-speed shaft brake control system for the wind turbine generator set of embodiment 1, and includes a high-speed shaft brake power supply control part and a high-speed shaft brake temperature detection control part.

[0057] The high-speed shaft brake power supply control part includes the following steps:

[0058] S1.1, input power supply and pulse output to the speed monitor through the speed signal generation device of the wind turbine generator set;

[0059] S1.2, calculate the speed of the wind turbine generator set through the speed monitor, if the speed of the unit is lower than the allowed brake speed, output a closed signal of the speed control switch K2, at this time, the brake condition is met, if the speed of the unit is greater than the set speed, output a disconnected signal of the speed control switch K2, the high-speed shaft brake is not allowed;

[0060] S1.3, control the safety chain to be disconnected and the safety relay switch K3 to be closed through the safety relay and the emergency stop button of the wind turbine generator set, at this time, the brake condition is met, if the emergency stop button is not triggered, output a disconnected signal, the high-speed shaft brake is not allowed;

[0061] S1.4, control the main control brake switch K4 to be closed through the digital output of the main control PLC, at this time, the brake condition is met;

[0062] S1.5, the main control remote brake release switch K1 is in a normally closed state, at this time, the high-speed shaft brake electromagnetic valve Y1 and the high-speed shaft brake electromagnetic valve Y2 are powered on, so that the high-speed shaft brake is released; if the out-to-sea maintenance reset condition is not met during a typhoon or deep-sea unit control line failure, control the main control remote brake release switch K1 to be disconnected through the digital output of the main control PLC, and the high-speed shaft brake is released;

[0063] The high-speed shaft brake temperature detection control part includes the following steps,

[0064] S2.1, collect the temperature of the high-speed shaft brake by using the high-speed shaft brake temperature sensor, and collect the temperature in the engine room by using the engine room temperature sensor, and transmit them to the main control PLC;

[0065] S2.1, when the high-speed shaft brake is in abnormal working condition, mechanical failure or high-speed shaft brake power supply control loop failure occurs, the main control PLC calculates and judges, when the temperature difference between the high-speed shaft brake temperature and the cabin temperature is greater than 25 degrees and lasts for 3s, the unit stops at this time, and the unit is prohibited from automatic reset.

[0066] The above is only a preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change within the scope disclosed by the present application, according to the technical scheme and the inventive concept of the present application, which belongs to the protection scope of the present application.

Claims

1. A high-speed shaft brake control system for a wind turbine generator set, characterized in that: The high-speed shaft brake power supply control circuit includes a high-speed shaft brake power supply control circuit, a high-speed shaft brake temperature detection control circuit, a main control PLC, a safety relay and a speed monitor. The high-speed shaft brake power supply control circuit includes a power supply, a main control remote release switch K1, a speed control switch K2, a safety relay switch K3, a main control brake switch K4, a high-speed shaft brake solenoid valve Y1 and a high-speed shaft brake solenoid valve Y2. The input end of the main control remote release switch K1 is connected to the power supply, the input end of the speed control switch K2 is connected to the output end of the main control remote release switch K1, the safety relay switch K3 and the main control brake switch K4 are connected in parallel, the input ends of the safety relay switch K3 and the main control brake switch K4 are connected to the output end of the speed control switch K2, the input end of the high-speed shaft brake solenoid valve Y1 is connected to the output ends of the safety relay switch K3 and the main control brake switch K4, the output end of the high-speed shaft brake solenoid valve Y1 is connected to a 0V power supply, the input end of the high-speed shaft brake solenoid valve Y2 is connected to the safety relay switch K3 and the main control The output end of the brake switch K4 is connected to the output end of the high-speed shaft brake solenoid valve Y2, which is connected to a 0V power supply. The master remote release switch K1 and the master brake switch K4 are respectively connected to the main control PLC, and the master remote release switch K1 and the master brake switch K4 are controlled by the main control PLC to close and open. The safety relay switch K3 is connected to the safety relay, and the safety relay controls the closing and opening of the safety relay switch K3. The speed control switch K2 is connected to the speed monitor, which is used to detect the fan speed and control the closing and opening of the speed control switch K2 according to the speed. The high-speed shaft brake temperature detection control loop includes a high-speed shaft brake temperature sensor R1 and a cabin temperature sensor R2. The high-speed shaft brake temperature sensor R1 and the cabin temperature sensor R2 are respectively connected to the temperature acquisition module of the main control PLC. When the high-speed shaft brake fails, the main control PLC compares the temperature of the high-speed shaft brake with the temperature in the cabin to determine whether to issue a shutdown command.

2. The wind turbine generator high-speed shaft brake control system according to claim 1, characterized in that: The output points DQ1 and DQ2 of the master PLC respectively output 24VDC power to one end of the coil of the master remote release switch K1 and the master brake switch K4, and the other ends of the master remote release switch K1 and the master brake switch K4 are connected to a 0V power supply. The output end of the safety relay outputs 24VDC power to one end of the coil of the safety relay switch K3, and the other end of the safety relay switch K3 is connected to a 0V power supply.

3. The wind turbine generator high-speed shaft brake control system according to claim 1, characterized in that: It also includes an overvoltage protection terminal V1 and an overvoltage protection terminal V2. The output port of the safety relay switch K3 is connected to a protected end port of the overvoltage protection terminal V1, and the output port of the master brake switch K4 is connected to a protected end port of the overvoltage protection terminal V2. The overvoltage protection terminal V1 and the other protected end port of the overvoltage protection terminal V2 are connected to a 0V power supply. The protection port of the overvoltage protection terminal V1 is connected to the high-speed shaft brake solenoid valve Y1 through a shielded cable W1, and the protection port of the overvoltage protection terminal V2 is connected to the high-speed shaft brake solenoid valve Y2 through a shielded cable W2.

4. The wind turbine generator high-speed shaft brake control system according to claim 1, characterized in that: The series connection sequence of the master remote release switch K1 , the speed control switch K2 , the safety relay switch K3 and the master brake switch K4 can be adjusted according to actual needs.

5. The wind turbine generator high-speed shaft brake control system according to claim 1, characterized in that: The speed monitor is powered by 24V and has a speed setting function. It includes two speed judgment output switches. One speed judgment output switch is used to judge whether the fan is overspeeding and perform an emergency shutdown. The other speed judgment output switch is used for low-speed detection and operates the brake when the speed is low. The speed control switch K2 is connected to the speed judgment output switch for low-speed detection. The speed monitor receives the signal from the speed signal generating device of the wind turbine. The speed signal generating device is powered by 24V and includes two wirings. One wiring is connected to the speed monitor and the other wiring is connected to the high-speed acquisition speed module of the main control PLC.

6. The wind turbine generator high-speed shaft brake control system according to claim 1, characterized in that: The safety relay adopts a programmable or non-programmable safety relay design. The emergency stop button and auxiliary contacts installed on the electrical cabinet door in the wind turbine generator set are connected to the input port of the safety relay. The emergency stop button and auxiliary contacts adopt a normally closed design. When the emergency stop button is pressed, the emergency stop button body and auxiliary contacts become normally open.

7. The wind turbine generator high-speed shaft brake control system according to claim 1, characterized in that: The high-speed shaft brake temperature sensor R1 is connected to terminal X4 through a shielded cable W3, and is connected to the temperature acquisition module of the main control PLC through terminal X4. The cabin temperature sensor R2 is connected to terminal X5 through a shielded cable W4, and is connected to the temperature acquisition module of the main control PLC through terminal X5.

8. The wind turbine generator high-speed shaft brake control system according to claim 1, characterized in that: The master remote release switch K1, the speed control switch K2, the safety relay switch K3 and the master brake switch K4 are all intermediate relays.

9. The wind turbine generator high-speed shaft brake control system according to claim 1, characterized in that: The high-speed shaft brake temperature sensor R1 and the cabin temperature sensor R2 are both PT100 temperature sensors.

10. A method for controlling a high-speed shaft brake of a wind turbine generator set, characterized in that: The high-speed shaft brake control system of a wind turbine generator set according to any one of claims 1 to 9 is implemented, comprising a high-speed shaft brake power supply control part and a high-speed shaft brake temperature detection control part; The high-speed shaft brake power supply control part includes the steps of: S1.

1. Input power and pulse output to the speed monitor through the speed signal generating device of the wind turbine generator set; S1.

2. The speed monitor calculates the speed of the wind turbine generator set. If the speed is lower than the allowable braking speed, the speed control switch K2 is output as a closing signal, and the braking condition is met. If the speed is higher than the set speed, the speed control switch K2 is output as a disconnecting signal, and the high-speed shaft brake is not allowed to engage. S1.

3. The safety chain is disconnected and the safety relay switch K3 is closed through the safety relay and the emergency stop button of the wind turbine. At this time, the braking condition is met. If the emergency stop button is not triggered, a disconnect signal is output, and the high-speed shaft brake is not allowed to engage. S1.

4. The master brake switch K4 is controlled to close through the digital output of the master PLC. At this time, the brake condition is met. S1.5, the master control remote release switch K1 is in the normally closed state. At this time, the high-speed shaft brake solenoid valves Y1 and Y2 are energized, causing the high-speed shaft brake to apply. If the deep-sea unit fails in a typhoon or if the control circuit fails and the unit is not ready for sea inspection and repair, the master control remote release switch K1 is controlled by the digital output of the master control PLC to disconnect the power supply, releasing the high-speed shaft brake. The high-speed shaft brake temperature detection control part includes the steps of: S2.

1. Use the high-speed shaft brake temperature sensor to collect the temperature of the high-speed shaft brake and the cabin temperature sensor to collect the temperature inside the cabin and transmit them to the main control PLC; S2.

1. When the high-speed shaft brake fails, the main control PLC will calculate and judge. When the temperature difference between the high-speed shaft brake temperature and the cabin temperature is greater than the preset temperature and lasts for the preset time, the unit will shut down and the unit will be prohibited from automatically resetting.

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