Monitoring transformation method for brake disc of wind generating set

Abstract

The invention discloses a monitoring transformation method for a brake disc of a wind generating set. Comprising the following steps: adding an analog quantity input module in a control cabinet; providing an AI point location for connecting a temperature sensor; a digital quantity output module is added in the control cabinet; providing a DO point location for connecting an execution device to realize overtemperature protection; a fan control program is upgraded; a rotating speed-temperature curve model is preset in the main control program, and in the rotating speed-temperature curve model, a rotating speed-temperature curve represents a threshold temperature associated with the rotating speed; an early warning temperature judgment module is additionally arranged in the main control program; the early warning temperature judgment module can obtain the real-time rotating speed of an impeller and the real-time temperature of a brake disc, obtain the corresponding threshold temperature from the rotating speed-temperature curve model, compare the real-time temperature of the brake disc with the threshold temperature, and execute overtemperature protection if the real-time temperature exceeds the threshold temperature; the temperature of the high-speed shaft brake caliper is accurately monitored in real time, and overtemperature of the high-speed shaft brake caliper is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine monitoring, and in particular to a monitoring and modification method for a brake disc of a wind turbine generator set. Background Art

[0002] With the occurrence of wind turbine fire accidents in recent years, it has had a negative impact on society and wind farms. At the same time, most wind turbine fire accidents are caused by the high-speed shaft brake caliper overheating and igniting other flammable materials. The high-speed shaft brake disc of the gearbox of the double-fed wind turbine generator set has a fast speed, and the temperature is easy to be high when the wind turbine is braked. In addition, the high-speed brake caliper of the Haizhuang wind turbine has no temperature detection, which poses a great safety hazard.

[0003] At present, Haizhuang wind turbine generator sets only measure the temperature of high-speed shaft bearings and front and rear bearings of generators, ignoring the temperature detection of high-speed shaft brake calipers. Without temperature monitoring of high-speed shaft brake calipers, when the high-speed shaft brake calipers overheat, it cannot be fed back to the wind turbine background monitoring, which is easy to cause wind turbine fire accidents. In order to avoid wind turbine fires, it is necessary to increase high-speed shaft brake temperature monitoring to achieve high-speed shaft brake safety management. Summary of the invention

[0004] The present invention aims to achieve the purpose of monitoring the temperature of the high-speed shaft brake caliper by adding a high-speed shaft brake caliper temperature sensor to the existing wind turbine, monitor the temperature of the high-speed shaft brake caliper in real time, and avoid overheating of the high-speed shaft brake caliper. A monitoring modification method for the brake disc of a wind turbine is proposed.

[0005] A monitoring and modification method for a brake disc of a wind turbine generator set; characterized in that it comprises the following steps:

[0006] 1) Stop the machine and lock the wind wheel;

[0007] 2) Add analog input module inside the control cabinet; provide AI point for connecting temperature sensor;

[0008] 3) Sensor installation and line connection;

[0009] 4) Add digital output modules inside the control cabinet; provide DO points for connecting actuators to achieve over-temperature protection;

[0010] 5) Fan control program upgrade; preset speed-temperature curve model in the main control program, in which the speed-temperature curve represents the threshold temperature associated with the speed; add an early warning temperature judgment module in the main control program; the early warning temperature judgment module can obtain the real-time speed of the impeller and the real-time temperature of the brake disc, obtain the corresponding threshold temperature from the speed-temperature curve model, and compare the real-time temperature of the brake disc with the threshold temperature. If the real-time temperature exceeds the threshold temperature, over-temperature protection is executed. The beneficial effects of the present invention are:

[0011] Compared with the existing technology, the above-mentioned technical transformation enables the background to accurately monitor the temperature of the high-speed shaft brake caliper in real time. If there is any temperature abnormality, the fan can be shut down in real time to avoid the high-speed shaft brake disc overheating and causing a fan fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the speed-temperature curve model.

[0013] Figure 2 This is a schematic diagram of the main control system. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] The existing Haizhuang Wind Power 2MW wind turbine high-speed shaft brake in the wind farm uses an active brake, which is braked by the friction of the brake pads triggered by the hydraulic system. The brake pads are made of composite metal materials. Since there are no reserved installation holes for the high-speed shaft brake of the unit, the high-speed shaft brake will move left and right when braking, and the contact temperature sensor cannot be used. In addition, the space limitation of the brake structure also makes it impossible to arrange a close-range temperature sensor.

[0016] The high-speed shaft output is used to drive the generator through the coupling. The coupling protection cover is located on the side of the brake pad and there is no other mechanical interference structure around it. The coupling protection cover can provide a mounting position.

[0017] The temperature sensor uses an infrared temperature sensor to achieve non-contact long-distance temperature measurement. The temperature sensor outputs a 4-20MA analog signal.

[0018] The specific parameters of the temperature sensor are shown in Table 1 below:

[0019] Table 1 Sensor and accessories parameters

[0020] Parameter name Specific parameter values Measuring range 0℃ to 600℃ Input voltage 24V Output 4-20MA Protection level IP65 Operating temperature 0℃ to 60℃

[0021] The monitoring transformation of the brake disc of the existing wind turbine generator set includes the following steps:

[0022] 1) Stop the machine and lock the wind wheel.

[0023] 2) Add analog input module inside the control cabinet.

[0024] Disconnect the 24VDC power supply of the cabin, then disconnect the UPS power supply, and then disconnect the 400V power supply of the cabin. Make sure that the circuit module can be added inside the control cabinet only after the power is cut off. Add an analog input module to the PLC system of the cabin control cabinet of the unit to provide AI points for connecting temperature sensors.

[0025] 3) Sensor installation and line connection.

[0026] 3-1) Temporarily assemble the sensor and its bracket.

[0027] 3-2) Position the sensor and its bracket; move the bracket on the coupling protection cover to ensure that there is no spatial interference between the sensor and its bracket and the surrounding equipment and the brake disc, and ensure that the sensor beam can be projected vertically onto the brake disc and the beam is not blocked by the surrounding equipment. Then, mark the sensor bracket positioning hole on the high-speed shaft coupling protection cover.

[0028] 3-3) Drill mounting holes on the high-speed shaft coupling protective cover according to the size of the bracket fixing bolts.

[0029] 3-4) Install the sensor bracket, apply thread fastener (1243) to the bracket fixing bolts and tighten them, use the matching flat washers and bolts to fix the sensor bracket to the corresponding position of the protective cover, fix the sensor on its bracket, and connect the sensor cable to the AI ​​point of the analog input module.

[0030] 3-5) Verify that the sensor detection range is on the brake disc and meets the measurement performance requirements. Verify that the sensor and its bracket, cable and other components of the unit have no interference.

[0031] 4) Add a digital output module inside the control cabinet. A digital output module is added to the PLC system of the cabin control cabinet of the unit to provide DO points for connecting actuators.

[0032] The actuator adopts a relay.

[0033] The normally closed contacts of the relay are connected in series to the yaw protection signal circuit; the relay is used to disconnect the yaw protection signal circuit when powered on, so as to enable the wind turbine to perform yaw twisting cable rotation, so that the wind turbine is out of the windward state and the alarm is turned off.

[0034] 5) Fan control program upgrade;

[0035] The monitoring of high-speed shaft brake caliper temperature signal is added to the main control program, and a speed-temperature curve model is established; the trigger conditions for the high-speed shaft brake caliper temperature over-limit fault and the corresponding dynamic control strategy are formulated, and the unit's monitoring of the high-speed shaft brake caliper temperature is improved to ensure safe and stable operation of the unit.

[0036] 5-1) Preset the speed-temperature curve model in the main control program;

[0037] The brake is applied by friction with the brake pad. Since the temperature rise rate of the brake pad is related to the speed, the speed-temperature curve model is designed to correspond to a lower threshold temperature at a higher speed and a higher threshold temperature at a lower speed. This allows for setting a reasonable threshold temperature under different speed conditions, avoiding false alarms that are prone to occur during regulation when the fixed threshold temperature is used.

[0038] like Figure 1 As shown, the speed-temperature curve model has a plurality of speed-temperature curves related to the ambient temperature, and each speed-temperature curve represents a threshold temperature associated with the speed at different ambient temperatures.

[0039] The horizontal axis is R (rotation speed) and the vertical axis is T (threshold temperature). Curves S1-S4 represent fitting curves under different ambient temperature conditions, which correspond to ambient temperatures below 10 degrees Celsius, 10-20 degrees Celsius, 20-30 degrees Celsius, and above 30 degrees Celsius. Taking the S1 curve as an example, the ambient temperature is below 10 degrees Celsius, and when the rotation speed increases along the horizontal axis, the threshold temperature decreases accordingly.

[0040] 5-2) Add a warning temperature judgment module to the main control program;

[0041] The early warning temperature judgment module can obtain the real-time impeller speed, brake disc temperature, and ambient temperature.

[0042] The speed is measured in real time by the impeller tachometer in the unit system, and the ambient temperature can be obtained based on the temperature measurement of the real-time thermometer or based on the weather forecast information on the Internet. The real-time temperature of the brake disc is obtained through the additional infrared temperature sensor.

[0043] The early warning temperature judgment module obtains the corresponding threshold temperature from the speed-temperature curve model based on the real-time impeller speed and the real-time ambient temperature, and compares the real-time temperature of the brake disc with the threshold temperature. If the real-time temperature exceeds the threshold temperature, the main control program outputs a digital signal to drive the actuator relay to realize the yaw cable rotation of the wind turbine, so that the wind turbine is out of the windward state and the alarm is shut down.

[0044] The monitoring device of the high-speed shaft brake disc of the modified wind turbine generator set includes: a temperature detection device, an analog input module, a main control system, a digital output module and a relay. The temperature detection device is connected to the input end of the analog input module, the output end of the analog input module is connected to the input end of the main control system, the output end of the main control system is connected to the input end of the digital output module, the output end of the digital output module is connected to the relay, and the normally closed contact of the relay is arranged in series in the yaw protection signal circuit; the main control system is used to control the digital output module to output voltage to the relay when the temperature detection device detects that the temperature of the brake pad exceeds the preset temperature of the pitch change; the relay is used to disconnect the yaw protection signal circuit in the power-on state to realize the yaw protection of the wind turbine generator set.

[0045] The temperature detection device is an infrared temperature sensor, and the main control system is PLC;

[0046] The main control system has an early warning temperature judgment module, which can obtain the real-time impeller speed, brake disc temperature, and ambient temperature, and obtain the corresponding threshold temperature from the speed-temperature curve model based on the real-time impeller speed and ambient temperature. The real-time temperature of the brake disc is compared with the threshold temperature. If the real-time temperature exceeds the threshold temperature, the main control system outputs a digital signal to drive the actuator relay to realize the yaw twist cable rotation of the wind turbine, so that the wind turbine is out of the windward state and the alarm is shut down.

[0047] Finally, it should be noted that the above description is only an explanation of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail, those skilled in the art can still modify the technical solutions described above or replace some of the technical features with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A monitoring and modification method for the brake disc of a wind turbine generator set; characterized in that: The steps include: 1) Stop the machine and lock the wind wheel; 2) Add analog input module inside the control cabinet; provide AI point for connecting temperature sensor; 3) Sensor installation and line connection; 4) Add digital output modules inside the control cabinet; provide DO points for connecting actuators to achieve over-temperature protection; 5) Fan control program upgrade; preset speed-temperature curve model in the main control program, in which the speed-temperature curve represents the threshold temperature associated with the speed; add an early warning temperature judgment module in the main control program; The early warning temperature judgment module can obtain the real-time impeller speed and brake disc temperature, obtain the corresponding threshold temperature from the speed-temperature curve model, and compare the real-time temperature of the brake disc with the threshold temperature. If the real-time temperature exceeds the threshold temperature, over-temperature protection is executed.

2. A monitoring and modification method for a brake disc of a wind turbine generator set according to claim 1, characterized in that: In step 3), include 3-1) Temporarily assemble the sensor and its bracket; 3-2) Position the sensor and its bracket; move the bracket on the coupling protection cover to ensure that there is no spatial interference between the sensor and its bracket and the surrounding equipment and the brake disc, and ensure that the sensor beam can be projected vertically on the brake disc and the beam is not blocked by the surrounding equipment. Then, mark the sensor bracket positioning hole on the high-speed shaft coupling protection cover; 3-3) Drill mounting holes on the high-speed shaft coupling protection cover according to the size of the bracket fixing bolts; 3-4) Install the sensor bracket, apply thread fastener to the bracket fixing bolts and tighten them, use the matching flat washers and bolts to fix the sensor bracket to the corresponding position of the protective cover, fix the sensor on its bracket, and connect the sensor cable to the AI ​​point of the analog input module.

3. A monitoring and modification method for a brake disc of a wind turbine generator set according to claim 2, characterized in that: In step 3), include 3-5) Verify and test that the sensor detection range is on the brake disc and meets the measurement performance requirements; verify that the sensor and its bracket, cables and other components of the unit have no interference.

4. A monitoring and modification method for a brake disc of a wind turbine generator set according to claim 1, characterized in that: In step 4), include The actuator adopts a relay, and the normally closed contact of the relay is connected in series to the yaw protection signal circuit; the relay is used to disconnect the yaw protection signal circuit when powered on, so as to realize the yaw twist cable rotation of the wind turbine generator set.

5. The monitoring and modification method of the brake disc of a wind turbine generator set according to claim 1 is characterized in that: In step 5), include The speed-temperature curve model is designed so that a higher speed corresponds to a lower threshold temperature and a lower speed corresponds to a higher threshold temperature.

6. The monitoring and modification method of the brake disc of a wind turbine generator set according to claim 1 is characterized in that: In step 5), include The speed-temperature curve model has a plurality of speed-temperature curves related to the ambient temperature, and each speed-temperature curve represents a threshold temperature associated with the speed at different ambient temperatures.

7. A monitoring and modification method for a brake disc of a wind turbine generator set according to claim 6, characterized in that: In step 5), include The early warning temperature judgment module obtains the corresponding threshold temperature from the speed-temperature curve model based on the real-time speed of the impeller and the real-time temperature of the environment, and compares the real-time temperature of the brake disc with the threshold temperature.

8. A monitoring and modification method for a brake disc of a wind turbine generator set according to claim 7, characterized in that: In step 5), include The speed is measured in real time by the impeller tachometer in the unit system, and the ambient temperature can be obtained based on the real-time thermometer temperature measurement or based on the network weather forecast information.

9. A monitoring and modification method for a brake disc of a wind turbine generator set according to claim 1, characterized in that: In step 5), include When over-temperature protection is activated, the main control program outputs a digital signal to drive the actuator relay to realize the yaw cable rotation of the wind turbine, so that the wind turbine leaves the windward state and the alarm is sounded to shut down.

10. A monitoring and modification method for a brake disc of a wind turbine generator set according to claim 1, characterized in that: In step 2), include The temperature sensor is an infrared temperature sensor.

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