Control system and method for preventing aerodyne from galloping

Abstract

The invention relates to the technical field of fan galloping prevention, in particular to a fan galloping prevention control system and method.The fan galloping prevention control system comprises a fan power source, a fan main control system and a yaw control system, the fan power source is electrically connected with the fan main control system, and the fan main control system is used for receiving electric power provided by the fan power source and controlling the fan galloping prevention control system to yaw. The fan master control system is in communication connection with the yaw control system, the yaw control system responds to an instruction sent by the fan control system, and the system further comprises an external power source and a fan connecting pipe system; a system which is not controlled by a fan master control system and does not use a fan power supply is adopted, the system is composed of a proximity switch, a speed sensor, a controller and a UPS power supply, the sensor and the control system of the fan are not shared, electric power is supplied to the UPS power supply of the system only from an external power supply, the UPS power supply is kept in a combat readiness state, and the system is safe and reliable. Therefore, the crosswind yawing operation of the fan can still be implemented under the condition that various extreme conditions are overlapped.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fan anti-racing, in particular to a control system and method for preventing fan racing. BACKGROUND

[0002] Fan racing, in a popular way, refers to that the fan loses speed control, the impeller speed rises sharply, far exceeds the designed maximum safe speed, and the whole unit is in a state of out of control and extreme danger. The essence of racing is that the "aerodynamic brake" system and "mechanical brake" system of the wind turbine fail simultaneously or successively, and the impeller cannot stop rotating when the wind speed is too high or a fault occurs.

[0003] In order to prevent racing and tower collapse, currently, measures such as "increasing reliable backup power for variable pitch, optimizing high-speed brake intervention strategy, and yawing 90° to the side wind" are often taken, but these measures can only solve individual extreme cases and cannot fundamentally prevent fan racing and tower collapse accidents.

[0004] For example: ① Once the fan control system and the driver have a problem, the backup power cannot guarantee the blade to be retracted. ② If the box transformer trips, the fan is powered off, and the yawing to the side wind action cannot be implemented. ③ If the fan main control system is dead, the program fails, and the high-speed brake may fail.

[0005] In order to cope with multiple extreme cases and prevent fan racing and tower collapse, a control system and method for preventing fan racing are proposed. SUMMARY

[0006] In view of the above-mentioned shortcomings of the prior art, the present application provides a control system and method for preventing fan racing, which can effectively solve the existing problems.

[0007] In order to achieve the above-mentioned purposes, the present application is realized by the following technical scheme: The present application provides a control system for preventing fan racing, comprising a fan power supply, a fan main control system and a yaw control system, the fan power supply is electrically connected with the fan main control system, the fan main control system is used for receiving the power provided by the fan power supply, the fan main control system is in communication connection with the yaw control system, the yaw control system responds to the instruction issued by the fan control system, the fan main control system is provided with a fan speed limit value, further comprising an external power supply and a fan connection system, the external power supply is electrically connected with the fan connection system, the fan connection system is used for receiving the power provided by the external power supply, the fan connection system is in communication connection with the fan main control system and the yaw control system respectively, the fan connection system cuts off the communication connection between the fan main control system and the yaw control system, and makes the yaw control system respond to the instruction issued by the fan connection system.

[0008] Further, the fan connection system comprises a control module, a monitoring module and an execution module; the control module is used to generate operation instructions and safety instructions; the monitoring module is used to monitor fan operation data; and the execution module is used to cut off or establish the communication connection between the fan main control system and the yaw control system.

[0009] Further, the control module comprises a USP power supply and a controller, the USP power supply is electrically connected with the controller, and the controller is in a state of combat readiness when receiving the power provided by the USP power supply.

[0010] Further, the monitoring module comprises a proximity switch and a speed sensor, both of which are electrically connected with the controller; and the monitoring module is used to monitor the rotating speed of the fan.

[0011] Further, the speed sensor is installed at the impeller of the fan and is used to detect the rotating speed of the impeller.

[0012] Further, the proximity switch is installed at the yaw gear of the fan and is used to detect the yaw angle by counting.

[0013] Further, the execution module comprises an overspeed unit, an intermediate relay and a contactor, all of which are electrically connected with the controller, the overspeed unit is electrically connected with the intermediate relay, and the intermediate relay is electrically connected with the contactor; and the overspeed unit is used to set the set rotating speed limit value of the fan rotating speed.

[0014] Further, the set rotating speed limit value is greater than the fan rotating speed limit value.

[0015] Further, when the rotating speed of the fan exceeds the set rotating speed limit value, the intermediate relay is energized and attracted and kept, the contactor is energized, and the crosswind yaw operation of the fan is performed.

[0016] A control method of a control system for preventing the fan from running away: When the overspeed unit detects that the rotating speed of the fan is higher than the set rotating speed limit value, the crosswind yaw operation of the fan is started, which comprises the following steps: S1: the intermediate relay is energized and attracted and kept, the normally closed contact of the intermediate relay is disconnected, the connection between the fan main control system and the yaw control system is cut off, the contactor is energized, the 90-degree clockwise crosswind yaw operation of the fan is performed, and the controller starts to collect the count of the proximity switch to make the fan yaw to the 90-degree crosswind position by calculating the stroke of the proximity switch; After the fan yaws to the 90-degree crosswind position, the controller controls the intermediate relay to be disconnected, and the 90-degree yaw operation is stopped. S2: After the fan is yawed to the 90-degree position of the crosswind, the controller controls the middle relay to be disconnected, and the 90-degree yawing operation is stopped; S3: When the fan reaches the safe rotating speed, the controller outputs a high potential to the fan main control system to inform that the crosswind yawing operation of the fan has occurred. Advantages

[0017] Compared with the known prior art, the technical solution provided by the application has the following advantages: A system not controlled by the fan main control system and not using the fan power supply is adopted, which is composed of a proximity switch, a speed sensor, a controller and a UPS power supply, and does not share the sensor and control system of the fan. Only the UPS power supply of the system is supplied with power from an external power supply to keep the UPS power supply in a state of combat readiness, so that the crosswind yawing operation of the fan can still be implemented under the superposition of multiple extreme conditions. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0019] Fig. 1 It is a schematic diagram of the overall process of the present application; Fig. 2 It is a schematic diagram of the fan connection system of the present application; Fig. 3 It is a schematic diagram of the process of establishing connection between the fan connection system and the yaw control system of the present application. DETAILED DESCRIPTION

[0020] The embodiments of the present application will be described in more detail below with reference to the drawings. Although some embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms, and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes, and are not intended to limit the protection scope of the present application.

[0021] It should be noted that the modification of "one" or "multiple" mentioned in the present application is illustrative but not restrictive, and those skilled in the art should understand that unless otherwise explicitly indicated in the context, it should be understood as "one or more".

[0022] The present application will be further described below in conjunction with the embodiments.

[0023] Example A control system for a wind-resistant flying car, such as Figs. 1-3 As shown, the system includes a wind turbine power supply, a wind turbine main control system, and a yaw control system. The wind turbine power supply is electrically connected to the wind turbine main control system, which receives power from the power supply. The wind turbine main control system is communicatively connected to the yaw control system, which responds to commands issued by the wind turbine main control system. The wind turbine main control system is a comprehensive system integrating computer technology, automation control technology, and communication technology. It is located within the nacelle and tower base of the wind turbine and continuously monitors, controls, adjusts, and protects every major component of the wind turbine. Its main functions are... It includes: 1. Sequential control and start / stop management; 2. Power and speed regulation; 3. Yaw control; 4. Comprehensive status monitoring and fault protection. The yaw control system is a relatively independent subsystem, tightly coupled with the main control system of the wind turbine. The main control system sends yaw angle commands to the yaw control system, which is responsible for executing them quickly and accurately. The main control system of the wind turbine has a wind turbine speed limit. When the wind turbine speed exceeds the limit, the main control system issues a command, which is executed by the yaw control system to make the wind turbine perform crosswind yaw operation, preventing the wind turbine from running away. It also includes an external power supply and a wind turbine connection system. The external power supply is electrically connected to the wind turbine connection system, which receives power from the external power supply. The wind turbine connection system is communicatively connected to the wind turbine main control system and the yaw control system. The wind turbine connection system sends a signal to disconnect the communication connection between the wind turbine main control system and the yaw control system, causing the yaw control system to respond to the commands issued by the wind turbine connection system. It should be noted that the control cabinet of the wind turbine connection system is an independent electrical control cabinet separate from the wind turbine control system. The independent electrical control cabinet is powered by an external power supply and shares two different power supply systems with the wind turbine control system, thereby ensuring that the USP power supply inside the independent control cabinet is always in a standby state.

[0024] Specifically, the wind turbine takeover system includes a control module, a monitoring module, and an execution module; the control module is used to generate operating instructions and safety instructions; the monitoring module is used to monitor wind turbine operating data; and the execution module is used to disconnect the communication connection between the wind turbine main control system and the yaw control system or establish a communication connection with the yaw control system. The control module includes a USP power supply and a controller. The USP power supply is electrically connected to the controller, and the controller receives power from the USP power supply and is in a standby state. In the standby state, the controller can work in a timely manner. When the wind turbine control system loses power, the wind turbine takeover system can take over the yaw control system in a timely manner, and then know that the wind turbine is performing crosswind yaw operation. Crosswind yaw operation refers to controlling the nacelle to rotate around the tower axis, so that the rotor rotation surface maintains an angle with the wind direction, thereby significantly reducing the wind energy captured by the rotor, achieving the purpose of reducing the rotor speed and the overall load. The monitoring module includes a proximity switch and a speed sensor, both of which are electrically connected to the controller. The monitoring module monitors the fan speed. The speed sensor is installed on the fan impeller to detect its rotational speed. The proximity switch is installed on the fan's yaw gear to detect the yaw angle by counting. The proximity switch and speed sensor are independent components for monitoring fan speed, separate from the fan control system. Monitoring fan speed through these independent components is unaffected by the main fan control system. Even if the main fan control system malfunctions or loses power, the fan speed monitoring will not cease. If excessively high fan speed is detected at this time, the fan takeover system will guide the fan to perform crosswind yaw operations, thereby ensuring fan safety. The execution module includes an overspeed unit, an intermediate relay, and a contactor. The overspeed unit, intermediate relay, and contactor are all electrically connected to the controller. The overspeed unit is electrically connected to the intermediate relay, and the intermediate relay is electrically connected to the contactor. The overspeed unit is used to set a set speed limit for the fan speed. When the fan speed exceeds the set speed limit, the intermediate relay is energized and engages, energizing the contactor to perform crosswind yaw operation on the fan. The set speed limit is greater than the fan speed limit. The set speed limit set by the overspeed unit must be greater than the fan speed required by the fan control system to induce crosswind yaw. Only when it exceeds the value set by the main fan control system can the fan overspeed be detected by the monitoring module and the fan takeover system be activated to take over the fan in the event of a fault in the main fan control system (such as damage to components monitoring fan speed or program corruption).

[0025] A control method for a windbreak motor overrunning control system: When the overspeed unit detects that the fan speed is higher than the set speed limit, it initiates the crosswind yaw operation of the fan, including the following steps: S1: the intermediate relay is energized and closed, the normally closed contact of the intermediate relay is opened, the connection between the fan main control system and the yaw control system is cut off, at the same time the contactor is energized, the 90 degree clockwise crosswind yaw operation of the fan is performed, and the controller starts to collect the proximity switch count, the fan is yawed to the crosswind 90 degree position by calculating the proximity switch stroke; After the fan is yawed to the crosswind 90 degree position, the controller controls the intermediate relay to be opened, and the 90 degree yaw operation is stopped; S2: after the fan is yawed to the crosswind 90 degree position, the controller controls the intermediate relay to be opened, and the 90 degree yaw operation is stopped; S3: when the fan reaches the safe rotating speed, a high potential is output by the controller to the fan main control system, and it is informed that the crosswind yaw operation is performed.

[0026] The above examples are only used to illustrate the technical solutions of the present application, and not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A wind turbine runaway control system, comprising a wind turbine power supply, a wind turbine main control system and a yaw control system, the wind turbine power supply being electrically connected to the wind turbine main control system, the wind turbine main control system being configured to receive power supplied by the wind turbine power supply, the wind turbine main control system being communicatively connected to the yaw control system, the yaw control system being configured to respond to instructions from the wind turbine control system, the wind turbine main control system being provided with a wind turbine speed limit, characterized in that the system further comprises an external power supply and a wind turbine takeover system, the external power supply being electrically connected to the wind turbine takeover system, the wind turbine takeover system being configured to receive power supplied by the external power supply, the wind turbine takeover system being communicatively connected to the wind turbine main control system and the yaw control system, the wind turbine takeover system being configured to send a signal to cut off the communication connection between the wind turbine main control system and the yaw control system, so that the yaw control system responds to instructions from the wind turbine takeover system. 2.The wind turbine runaway control system according to claim 1, characterized in that the wind turbine takeover system comprises a control module, a monitoring module and an execution module. 3.The wind turbine runaway control system according to claim 2, characterized in that the control module comprises a USP power supply and a controller, the USP power supply being electrically connected to the controller, the controller being in a state of combat readiness when receiving power supplied by the USP power supply. 4.The wind turbine runaway control system according to claim 3, characterized in that the monitoring module comprises a proximity switch and a speed sensor, the proximity switch and the speed sensor being electrically connected to the controller. 5.The wind turbine runaway control system according to claim 4, characterized in that the monitoring module is configured to monitor the speed of the wind turbine. 6.The wind turbine runaway control system according to claim 5, characterized in that the speed sensor is installed at an impeller of the wind turbine and is configured to detect the speed of the impeller. 7.The wind turbine runaway control system according to claim 6, characterized in that the execution module comprises an overspeed unit, an intermediate relay and a contactor, the overspeed unit, the intermediate relay and the contactor being electrically connected to the controller, the overspeed unit being electrically connected to the intermediate relay, and the intermediate relay being electrically connected to the contactor. 8.The wind turbine runaway control system according to claim 7, characterized in that the set speed limit of the overspeed unit is greater than the wind turbine speed limit. 9.The wind turbine runaway control system according to claim 8, characterized in that the set speed limit of the overspeed unit is greater than the wind turbine speed limit. ​ ​ ​ 5. A control system for an anti-runaway wind turbine according to claim 4, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ When the fan speed exceeds the set speed limit, the intermediate relay is powered on and held, the contactor is powered on, and the fan is executed in the crosswind yaw operation.

10. The control method of the control system of the windmill according to claim 9, wherein, When the overspeed unit detects that the fan speed is higher than the set speed limit, the fan is started in the crosswind yaw operation, including the following steps: S1: the intermediate relay is powered on and held, the normally closed contact of the intermediate relay is opened, the connection between the fan main control system and the yaw control system is cut off, the contactor is powered on, the fan is executed in the 90-degree clockwise crosswind yaw operation, and the controller starts to collect the proximity switch count to make the fan yaw to the 90-degree crosswind position by calculating the proximity switch stroke; After the fan yaws to the 90-degree crosswind position, the controller controls the intermediate relay to be opened to stop the 90-degree yaw operation; S2: after the fan yaws to the 90-degree crosswind position, the controller controls the intermediate relay to be opened to stop the 90-degree yaw operation; S3: when the fan reaches the safe speed, a high potential is output to the fan main control system by the controller to inform that the fan has been executed in the crosswind yaw operation.

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