CN113700602B - Method and equipment for improving safety performance of fan - Google Patents

Abstract

Provided are a method and equipment for improving the safety performance of a fan. The pitch control system of the wind turbine is equipped with a safety protection circuit, and the safety protection circuit includes a feedback signal generator, a safety monitoring module and a pitch retraction controller, and the method includes: detecting the working state of the pitch retraction controller in real time through the feedback signal generator , and output a feedback indication signal for indicating the working state; monitor the feedback indication signal output by the feedback signal generator in real time through the safety monitoring module; when the safety monitoring module determines that the paddle retraction action needs to be triggered by monitoring the feedback indication signal, A pitch retraction control signal is generated by the safety monitoring module; in response to the pitch retraction control signal, the pitch actuator is controlled by the pitch retraction controller to execute the pitch retraction.

Description

Method and equipment for improving safety performance of fan

technical field

The present invention generally relates to the field of safety performance of wind turbines, and more specifically relates to a method and equipment for improving the safety performance of wind turbines through an innovative pitch safety protection circuit.

Background technique

Energy is the main material basis of social economy and human life, and the driving force of social development. However, the reserves of non-renewable energy such as petroleum, coal, and natural gas, which are the main pillars of energy in the world, are decreasing day by day. All countries in the world are developing wind power generation. As a new energy source, wind power generation has formed a mature scale.

A wind turbine (referred to as a fan for short) is a device that converts wind energy into electrical energy. The pitch device is an electric scheme in which an adjustable-speed motor drives the blades through a gear or a toothed belt, or a hydraulic pitch system in which a hydraulic cylinder controlled by a solenoid valve directly acts on the pitch bearing. In the process of wind turbine design, it is necessary to consider the working condition of the fan jamming, that is, the situation where one blade cannot return to a safe position. Under this working condition, the hub of the unit and the main bearing load will increase significantly compared with the non-faulty working condition.

Conventional electric pitch control can only ensure that the impeller does not overspeed under the 2oo3 architecture, but it is generally difficult to ensure that the unit does not jam the propeller under the 3oo3 architecture. The existing hydraulic pitch can guarantee the PLd safety level under the 2oo3 or 3oo3 architecture. In the design of wind turbines, the probability of blade jamming corresponding to this level is once every few decades, which cannot be ignored. According to the description of the unit fault elimination conditions in the DLC2.2 working condition in IEC 61400-1-2019, the impact on the design can only be ignored when the fault recurrence period is much longer than the life cycle of the fan. However, in the blade jamming failure conditions represented by DLC2.2 and other working conditions, there will often be a large hub center bending moment due to the unbalanced load on the impeller. Yaw and tower loads have important influences, and are often used as component size control loads in unit design, thereby affecting the economy of the unit.

Contents of the invention

Exemplary embodiments of the present invention aim to overcome the above-mentioned disadvantages that the high probability of blade jamming makes the unit load high, thereby affecting the economical efficiency of the unit.

According to a method of the present invention, a method for improving the safety performance of a fan is provided, wherein the pitch control system of the fan is equipped with a safety protection circuit, and the safety protection circuit includes a feedback signal generator, a safety monitoring module and a pitch control controller , the method includes: detecting the working state of the propeller retracting controller in real time through a feedback signal generator, and outputting a feedback indicating signal for indicating the working state; monitoring the feedback indicating signal output by the feedback signal generator in real time through a safety monitoring module ; When the safety monitoring module determines that it is necessary to trigger the pitch retraction action by monitoring the feedback indication signal, the pitch retraction control signal is generated by the safety monitoring module; in response to the pitch retraction control signal, the pitch actuator is controlled by the pitch retraction controller to execute Close the oars.

Optionally, when the feedback indication signal is different from the preset signal, the safety monitoring module may determine that the paddle retraction action needs to be triggered.

Optionally, the safety monitoring module may include a programmable logic controller and a safety relay, wherein the input of the programmable logic controller is connected to the output of the feedback signal generator, the output of the programmable logic controller is connected to the input of the safety relay, The output of the safety relay is used as the output of the safety monitoring module.

Optionally, the step of generating a pitch retraction control signal through the safety monitoring module may include: when the feedback indication signal is different from the preset signal, a programmable logic controller generates and outputs a pitch retraction indication signal; The programmable logic controller receives the indication signal for retracting the propeller, and the safety relay generates the control signal for retracting the propeller by cutting off power.

Optionally, in response to the pitch retraction control signal, the step of controlling the pitch actuator to perform pitch retraction through the pitch retraction controller may include: in response to the pitch retraction control signal, the pitch retraction controller controls the pitch retraction by powering off. The paddle actuator executes paddle retraction.

Optionally, the method may further include: receiving a power-off signal or a propeller retraction indication signal from the wind turbine main controller through a safety relay; The pitch control signal, wherein, in response to the pitch retraction control signal, the step of controlling the pitch actuator to execute the pitch retraction through the pitch retraction controller includes: in response to the pitch retraction control signal, the pitch retraction controller powers off Pitch retraction is performed by controlling the pitch actuator.

Optionally, when the pitch actuator includes a hydraulic cylinder, the pitch retraction controller can be realized by an emergency feathering solenoid valve, and the feedback signal generator can detect the working state of the emergency feathering solenoid valve, and output the valve of the emergency feathering solenoid valve The core feedback indication signal is used as the feedback indication signal, wherein the emergency feathering solenoid valve is installed between the hydraulic cylinder and the accumulator, and when the emergency feathering solenoid valve is powered off, the hydraulic cylinder relies on the driving force provided by the accumulator to Perform paddle retraction.

Optionally, the number of emergency feathering solenoid valves may be two, and when the spool feedback indication signal of any one of the emergency feathering solenoid valves is different from the preset signal, the safety monitoring module determines that the pitch retracting action needs to be triggered.

Optionally, the step of controlling the pitch actuator to perform pitch retraction by the pitch retraction controller through power-off may include: in response to the emergency feathering solenoid valve power-off, the rodless chamber of the hydraulic cylinder is connected to the accumulator, and the hydraulic cylinder The rod cavity and the fuel tank are connected to extend the cylinder rod to trigger the paddle retraction action.

Optionally, when the pitch actuator includes a DC motor, the pitch retraction controller can be realized by a contactor, and the feedback signal generator can detect the working state of the normally closed contact of the contactor, and output the The state feedback indication signal is used as the feedback indication signal, wherein the contactor is installed between the DC motor and the backup power supply, and when the coil of the contactor loses power, the normally closed contact of the contactor makes the DC motor and the backup power supply conductive, The DC motor relies on the power provided by the backup power source to perform the retraction operation.

Optionally, the step of the pitch retracting controller controlling the pitch actuator to execute the pitch retraction by cutting off the power may include: in response to the contactor coil being de-energized, the normally closed contact of the contactor is closed, thereby triggering the pitch retracting action.

According to another aspect of the present invention, a device for improving the safety performance of a fan is provided, wherein the device is installed on the pitch system of the fan, and the device includes: a feedback signal generator configured to detect in real time the working state of the propeller retracting controller, and output a feedback indicating signal for indicating the working state; the safety monitoring module is configured to monitor the feedback indicating signal output by the feedback signal generator in real time, wherein, when the safety monitoring module passes the monitoring When the feedback indication signal determines that it is necessary to trigger the pitch retraction action, the safety monitoring module generates a pitch retraction control signal; the pitch retraction controller is configured to respond to the pitch retraction control signal and control the pitch actuator to execute the pitch retraction.

Optionally, when the feedback indication signal is different from the preset signal, the safety monitoring module may determine that the paddle retraction action needs to be triggered.

Optionally, the safety monitoring module may include a programmable logic controller and a safety relay, wherein the input of the programmable logic controller is connected to the output of the feedback signal generator, the output of the programmable logic controller is connected to the input of the safety relay, The output of the safety relay is used as the output of the safety monitoring module.

Optionally, when the feedback indication signal is different from the preset signal, the programmable logic controller may generate and output a pitch retraction instruction signal; in response to receiving the pitch retraction instruction signal from the programmable logic controller, The safety relay can generate the propeller retraction control signal by de-energizing.

Optionally, in response to the pitch retraction control signal, the pitch retraction controller may control the pitch actuator to perform pitch retraction by cutting off power.

Optionally, the safety relay may receive a power-off signal or a propeller-retracting indication signal from the main control of the wind turbine; in response to the received power-off signal or propeller-retracting indication signal, the safety relay may generate the propeller-retracting control signal by powering off; In response to the pitch retraction control signal, the pitch retraction controller can control the pitch actuator to perform pitch retraction by cutting off power.

Optionally, when the pitch actuator includes a hydraulic cylinder, the pitch retraction controller can be realized by an emergency feathering solenoid valve, and the feedback signal generator can detect the working state of the emergency feathering solenoid valve, and output the valve of the emergency feathering solenoid valve The core feedback indication signal is used as the feedback indication signal, wherein the emergency feathering solenoid valve is installed between the hydraulic cylinder and the accumulator, and when the emergency feathering solenoid valve is powered off, the hydraulic cylinder relies on the driving force provided by the accumulator to Perform paddle retraction.

Optionally, the number of emergency feathering solenoid valves may be two, and when the spool feedback indication signal of any one of the emergency feathering solenoid valves is different from the preset signal, the safety monitoring module determines that the pitch retracting action needs to be triggered.

Optionally, in response to power failure of the emergency feathering solenoid valve, the rodless chamber of the hydraulic cylinder is connected to the accumulator, and the rod chamber of the hydraulic cylinder is connected to the oil tank to extend the cylinder rod, thereby triggering the retracting action.

Optionally, when the pitch actuator includes a DC motor, the pitch retraction controller can be realized by a contactor, and the feedback signal generator can detect the working state of the normally closed contact of the contactor, and output the The state feedback indication signal is used as the feedback indication signal, wherein the contactor is installed between the DC motor and the backup power supply, and when the coil of the contactor loses power, the normally closed contact of the contactor makes the DC motor and the backup power supply conductive, The DC motor relies on the power provided by the backup power source to perform the retraction operation.

Optionally, in response to de-energization of the contactor coil, the normally closed contacts of the contactor are closed, thereby triggering the propeller retracting action.

According to another aspect of the present invention, there is provided a system comprising at least one computing device and at least one storage device storing instructions, wherein said instructions, when executed by said at least one computing device, cause said at least one A computing device performs the operations performed by the security monitoring module.

According to another aspect of the present invention, there is provided a computer-readable storage medium storing instructions, characterized in that, when the instructions are executed by at least one computing device, the at least one computing device is prompted to perform execution through a security monitoring module operation.

According to the method and equipment for improving the safety performance of the fan of the present invention, the probability of blade jamming is reduced through the pitch change safety protection circuit, and the purpose of eliminating the blade jamming condition is achieved, thereby reducing unit load and improving economy.

Description of drawings

These and/or other aspects and advantages of the present invention will become clear and easier to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 is a block diagram illustrating a device for improving the safety performance of a wind turbine according to an exemplary embodiment of the present invention;

2 is a schematic diagram showing the structure of a security monitoring module according to an exemplary embodiment of the present invention;

Fig. 3 is a schematic diagram showing a device for improving the safety performance of a wind turbine under a hydraulic pitch system according to an exemplary embodiment of the present invention;

Fig. 4 is a schematic diagram showing a device for improving the safety performance of a wind turbine under a DC pitch system according to an exemplary embodiment of the present invention;

Fig. 5 is a flowchart illustrating a method for improving safety performance of a wind turbine according to an exemplary embodiment of the present invention.

Detailed ways

The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of embodiments of the present invention as defined by the claims and their equivalents. Various specific details are included to aid in understanding but are to be regarded as exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

In order to reduce the working conditions of blade jamming and reduce the probability of blade jamming, the present invention designs a safety protection circuit of the pitch control system to ensure a sufficiently reliable blade retraction function. According to functional safety-related design standards, the present invention designs a hydraulic system safety protection circuit under the category 4 framework. From the definition of category 4, it can be seen that in addition to the application of necessary welltried devices (guaranteed safety devices) and principles, a single fault in the safety protection circuit cannot cause the failure of the safety function, and the fault can be detected. In addition, the safety protection circuit of the pitch control system designed by the present invention can be applied to the hydraulic pitch control system in which the solenoid valve controls the hydraulic cylinder to directly act on the pitch bearing, and can also be applied to the direct current pitch control system. The device and method for improving the safety performance of a wind turbine according to the present invention will be described in detail below with reference to FIGS. 1 to 5 .

Fig. 1 is a block diagram illustrating an apparatus 100 for improving safety performance of a wind turbine according to an exemplary embodiment of the present invention. Here, the device 100 for improving the safety performance of the wind turbine may also be called a safety protection circuit, and is installed on the pitch control system of the wind turbine.

Referring to FIG. 1 , the device 100 for improving the safety performance of a wind turbine may include a feedback signal generator 110 , a safety monitoring module 120 and a pitch retraction controller 130 .

The feedback signal generator 110 can detect the working state of the pitch retraction controller 130 in real time, and output a feedback indicating signal for indicating the working state.

The safety monitoring module 120 can monitor the feedback indication signal output by the feedback signal generator 110 in real time. When the safety monitoring module 120 determines that the safety function needs to be triggered by monitoring the feedback indication signal, the safety monitoring module 120 generates a pitch control signal. Here, the safety function is to protect the wind turbine from overspeeding, that is to say, when the blades of the wind turbine vibrate, overspeed, or manually stop suddenly, the safety chain action of the wind turbine (ie, emergency propeller retraction) is triggered.

According to an exemplary embodiment of the present invention, when the feedback indication signal is different from the preset signal, the safety monitoring module 120 may determine that it is necessary to trigger the retracting action.

According to an exemplary embodiment of the present invention, the safety monitoring module 120 may be composed of a programmable logic controller (PLC) and a safety relay. For example, FIG. 2 is a schematic diagram illustrating the structure of the security monitoring module 120 according to an exemplary embodiment of the present invention. Referring to Fig. 2, the safety monitoring module 120 may include a programmable logic controller 121 and a safety relay 122, wherein the input (Input_121) of the programmable logic controller 121 is connected with the output of the feedback signal generator 110, and the output of the programmable logic controller 121 The output (Output_121 ) is connected to the input (Input_122 ) of the safety relay 122 , and the output (Output_122 ) of the safety relay 122 is used as the output of the safety monitoring module 120 .

When the feedback indication signal output by the feedback signal generator 110 is different from the preset signal, the programmable logic controller 121 generates and outputs a pitch retraction indication signal. In response to receiving the pitch retraction indication signal from the programmable logic controller 121 , the safety relay 122 is de-energized to generate the pitch retraction control signal.

In addition, the safety relay 122 can also be connected with the wind turbine master control (not shown), and can receive a power-off signal or a propeller retraction instruction signal from the wind turbine master control. For example, the safety relay 122 can receive the power on/off signal through the A1 and A2 interfaces, and can receive the propeller retracting instruction signal through the S11 and S12 interfaces. In response to a power-off signal or a propeller-retraction indication signal received from the wind turbine master, the safety relay 122 may be de-energized to generate a propeller-retraction control signal.

The pitch retraction controller 103 may respond to the pitch retraction control signal, and control a pitch actuator (not shown) to perform pitch retraction.

According to an exemplary embodiment of the present invention, in response to the pitch retraction control signal received from the safety monitoring module 120 , the pitch retraction controller 130 may control the pitch actuator to perform pitch retraction by cutting off power.

The device (safety protection circuit) 100 for improving the safety performance of a wind turbine according to an exemplary embodiment of the present invention can be used in a hydraulic pitch system and a direct current pitch system. Next, a schematic diagram of a device (safety protection circuit) 100 for improving the safety performance of a wind turbine under the hydraulic pitch system and the DC pitch system will be described in detail with reference to FIGS. 3 and 4 .

hydraulic pitch system

Fig. 3 is a schematic diagram showing a device 100 for improving the safety performance of a wind turbine under a hydraulic pitch system according to an exemplary embodiment of the present invention.

Referring to FIG. 3 , when the pitch system of the wind turbine is a hydraulic pitch system, that is, when the pitch actuator includes a hydraulic cylinder 340 , the pitch retraction controller can be realized by an emergency feathering solenoid valve 330 . The emergency feathering solenoid valve 330 can be installed between the hydraulic cylinder 340 and the accumulator 350 , when the emergency feathering solenoid valve 330 is powered off, the hydraulic cylinder 340 relies on the driving force provided by the accumulator 350 to perform the pitch retracting operation.

The feedback signal generator 310 can detect the working state of the emergency feathering solenoid valve 330 , and output a spool feedback indication signal of the emergency feathering solenoid valve 330 as the feedback indication signal. According to an exemplary embodiment of the present invention, the number of emergency feathering solenoid valves 330 may be two. a) When it is different from the preset signal, the safety monitoring module 320 determines that it is necessary to trigger the retraction action, and outputs a control signal for retraction (for example, any one of 1v1, 1v2, 2v1 and 2v2).

In response to the pitch control signal output by the safety monitoring module 320, the emergency feathering solenoid valve 330 is powered off. In response to power-off of the emergency feathering solenoid valve 330 , the rodless chamber of the hydraulic cylinder 340 is connected to the accumulator 350 , and the rod chamber of the hydraulic cylinder 340 is connected to the oil tank to extend the cylinder rod, thereby triggering the retraction action.

According to the functional safety standard, by monitoring the valve state of the emergency feathering solenoid valve 330 through the spool feedback indication signal, the system diagnosis coverage rate will reach more than 99%. The fully redundant circuit combined with the diagnostic coverage of more than 99% can meet the requirements of category 4. When the component selection meets the basic well tried principles and device requirements, the safety level of the entire safety protection circuit will reach PLe or SIL3, so that the blade Compared with the electric pitch system and the existing hydraulic pitch system, the probability of propeller jamming is reduced by 10 times or even more than a hundred times, thereby achieving the effect of eliminating the blade jamming condition at the wind turbine design end.

DC pitch system

Fig. 4 is a schematic diagram showing a device 100 for improving the safety performance of a wind turbine under a DC pitch system according to an exemplary embodiment of the present invention.

Referring to FIG. 4 , when the pitch system of the fan is a DC pitch system, that is, when the pitch actuator includes a DC motor 440 , the pitch retraction controller can be realized by a contactor 430 . Here, the contactor 430 may be a type with mirror contacts satisfying IEC60947-4-1. The contactor 430 may be installed between the DC motor 440 and the backup power source 450 . The normally closed contacts K1 and K2 of the contactor 430 and the DC motor 440 can be connected by two power lines, one of which is used as a redundant backup. When the coil of the contactor 430 is de-energized, the normally closed contacts K1 and K2 of the contactor 430 make the DC motor 440 conduct with the backup power supply 450 , and the DC motor 440 relies on the power provided by the backup power supply 450 to perform the propeller retracting operation.

The feedback signal generator 410 can detect the working state of the contactor 430, that is, the state of the normally open and normally closed contacts K1 and K2 of the contactor 430, and output the status feedback indication signal of the normally closed contacts K1 and K2 of the contactor 430 as the feedback indication signals (for example, k1 and k2).

When the safety monitoring module 420 determines that the safety function needs to be triggered by monitoring the feedback indication signals (eg, k1 and k2 ), the safety monitoring module 420 generates a pitch retraction control signal.

In response to the pitch control signal output by the safety monitoring module 420, the coil of the contactor 430 is de-energized. In response to the de-energization of the coil of the contactor 430, the normally closed contacts K1 and K2 of the contactor 430 are closed, thereby triggering the retraction action.

For the DC pitch system, its control system and safety system (that is, the safety protection circuit) are completely separated system architectures. Each independent component in the safety protection system is simple enough and has enough redundancy to ensure that a single failure does not destroy the safety function , and sufficient fault detectability.

Fig. 5 is a flowchart illustrating a method for improving safety performance of a wind turbine according to an exemplary embodiment of the present invention.

Referring to FIG. 5 , in step S501 , the feedback signal generator 110 can detect the working state of the pitch retraction controller 130 in real time, and output a feedback indicating signal for indicating the working state.

In step S502 , the feedback indication signal output by the feedback signal generator 110 may be monitored in real time through the safety monitoring module 120 .

In step S503, the safety monitoring module 120 may determine whether a safety function needs to be triggered by monitoring the feedback indication signal. Here, the safety function is to protect the wind turbine from overspeeding, that is to say, when the blades of the wind turbine vibrate, overspeed, or manually stop suddenly, the safety chain action of the wind turbine (ie, emergency propeller retraction) is triggered.

According to an exemplary embodiment of the present invention, when the feedback indication signal is different from the preset signal, the safety monitoring module 120 may determine that it is necessary to trigger the retracting action.

According to an exemplary embodiment of the present invention, the safety monitoring module 120 may be composed of a programmable logic controller (PLC) and a safety relay.

In step 504, when the safety monitoring module 120 determines that the safety function needs to be triggered by monitoring the feedback indication signal, the safety monitoring module 120 may generate a pitch control signal.

According to an exemplary embodiment of the present invention, when the feedback indication signal output by the feedback signal generator 110 is different from the preset signal, the programmable logic controller 121 generates and outputs a pitch retraction indication signal. In response to receiving the pitch retraction indication signal from the programmable logic controller 121 , the safety relay 122 is de-energized to generate the pitch retraction control signal.

According to another exemplary embodiment of the present invention, the safety relay 122 may also be connected to a main control unit of the wind turbine (not shown), and may receive a power-off signal or an indication signal of pitch retraction from the main control unit of the wind turbine. For example, the safety relay 122 can receive the power on/off signal through the A1 and A2 interfaces, and can receive the propeller retracting instruction signal through the S11 and S12 interfaces. In response to a power-off signal or a propeller-retraction indication signal received from the wind turbine master, the safety relay 122 may be de-energized to generate a propeller-retraction control signal.

In step S505, in response to the pitch retraction control signal, the pitch retraction controller 130 may control the pitch actuator (not shown) to perform pitch retraction.

According to an exemplary embodiment of the present invention, in response to the pitch retraction control signal received from the safety monitoring module 120 , the pitch retraction controller 130 may control the pitch actuator to perform pitch retraction by cutting off power.

The method for improving the safety performance of a wind turbine according to an exemplary embodiment of the present invention can be used in a hydraulic pitch system and a direct current pitch system. The method for improving the safety performance of the wind turbine under the hydraulic pitch system and the direct current pitch system has been described in detail above with reference to FIG. 3 and FIG. 4 , so details will not be repeated here.

According to the method and equipment for improving the safety performance of the fan of the present invention, the probability of blade jamming is reduced through the pitch change safety protection circuit, and the purpose of eliminating the blade jamming condition is achieved, thereby reducing unit load and improving economy.

The device and method for improving the safety performance of a wind turbine according to an exemplary embodiment of the present invention have been described above with reference to FIGS. 1 to 5 .

The security monitoring module shown in FIG. 1 can be configured as software, hardware, firmware or any combination of the above-mentioned items to perform specific functions. For example, the security monitoring module may correspond to a dedicated integrated circuit, may also correspond to pure software code, and may also correspond to a module combining software and hardware. In addition, one or more functions implemented by the security monitoring module may also be uniformly executed by components in a physical physical device (for example, a processor, a client or a server, etc.).

In addition, the operations performed by the security monitoring module in the method described with reference to FIG. 5 may be implemented by programs (or instructions) recorded on a computer-readable storage medium. For example, according to an exemplary embodiment of the present invention, a computer-readable storage medium storing instructions may be provided, wherein, when the instructions are executed by at least one computing device, the at least one computing device is caused to execute the operate.

The computer program in the above-mentioned computer-readable storage medium can be run in an environment deployed in computer equipment such as a client, a host, an agent device, a server, etc. It should be noted that the computer program can also be used to perform additional steps other than the above-mentioned steps or in More specific processing is performed when the above steps are executed, and the content of these additional steps and further processing has been mentioned in the description of the related method with reference to FIG. 5 , so details will not be repeated here to avoid repetition.

It should be noted that the security monitoring module according to the exemplary embodiment of the present invention can completely rely on the operation of the computer program to realize the corresponding functions, that is, each unit corresponds to each step in the functional framework of the computer program, so that the entire system can be implemented through special software Package (for example, lib library) is called to realize the corresponding function.

On the other hand, each device shown in FIG. 1 may also be implemented by hardware, software, firmware, middleware, microcode or any combination thereof. When implemented in software, firmware, middleware, or microcode, the program code or code segments for performing the corresponding operations may be stored in a computer-readable medium such as a storage medium, so that the processor can read and execute the corresponding program code or code segment to perform the corresponding operation.

For example, the exemplary embodiments of the present invention can also be implemented as a computing device, the computing device includes a storage unit and a processor, the storage unit stores a set of computer-executable instructions, and when the set of computer-executable instructions is executed by the processor, the execution Operations performed by a security monitoring module according to an exemplary embodiment of the present invention.

Specifically, the computing device can be deployed in a server or a client, or on a node device in a distributed network environment. In addition, the computing device may be a PC computer, a tablet device, a personal digital assistant, a smart phone, a web application, or other devices capable of executing the above-mentioned set of instructions.

Here, the computing device does not have to be a single computing device, but can also be any collection of devices or circuits capable of individually or jointly executing the above-mentioned instructions (or instruction sets). The computing device may also be part of an integrated control system or system manager, or may be configured as a portable electronic device that interfaces with local or remote (eg, via wireless transmission).

In a computing device, a processor may include a central processing unit (CPU), a graphics processing unit (GPU), a programmable logic device, a special purpose processor system, a microcontroller, or a microprocessor. Processors may also include, by way of example and not limitation, analog processors, digital processors, microprocessors, multi-core processors, processor arrays, network processors, and the like.

Some of the operations described in the operations performed by the security monitoring module according to an exemplary embodiment of the present invention can be realized by software, some operations can be realized by hardware, and in addition, the combination of software and hardware can also be used to implement implement these operations.

The processor can execute instructions or codes stored in one of the memory components, which can also store data. Instructions and data may also be sent and received over the network via the network interface device, which may employ any known transmission protocol.

The storage unit may be integrated with the processor, for example, RAM or flash memory disposed within an integrated circuit microprocessor or the like. Additionally, the storage component may comprise a separate device, such as an external disk drive, storage array, or any other storage device usable by the database system. The storage component and the processor can be operatively coupled or can communicate with each other, eg, via an I/O port, network connection, etc., such that the processor can read files stored in the storage component.

Additionally, a computing device may also include a video display (such as a liquid crystal display) and a user interaction interface (such as a keyboard, mouse, touch input device, etc.). All components of the computing device may be connected to each other via a bus and/or network.

Operations performed by the security monitoring module according to exemplary embodiments of the present invention may be described as various interconnected or coupled functional blocks or functional diagrams. However, these functional blocks or functional diagrams may equally be integrated into a single logical device or operate along imprecise boundaries.

Therefore, the operations performed by the security monitoring module described with reference to FIG. 5 may be implemented by a system including at least one computing device and at least one storage device storing instructions.

According to an exemplary embodiment of the present invention, at least one computing device is a computing device for performing operations performed by a security monitoring module according to an exemplary embodiment of the present invention, and a set of computer-executable instructions is stored in the storage device, when the computer can When the set of execution instructions is executed by at least one computing device, the steps of the operations performed by the security monitoring module described with reference to FIG. 5 are performed.

The exemplary embodiments of the present invention have been described above, and it should be understood that the above description is only exemplary and not exhaustive, and the present invention is not limited to the disclosed exemplary embodiments. Many modifications and alterations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the invention. Therefore, the protection scope of the present invention should be determined by the claims.

Claims (24)

1. A method for improving the safety performance of a fan, characterized in that the pitch system of the fan is equipped with a safety protection circuit, and the safety protection circuit includes a feedback signal generator, a safety monitoring module and a propeller retraction controller, and the method includes : Real-time detection of the working state of the propeller retraction controller by the feedback signal generator, and outputting a feedback indicating signal for indicating the working state; Monitor the feedback indication signal output by the feedback signal generator in real time through the safety monitoring module; When the safety monitoring module determines that the propeller retraction action needs to be triggered by monitoring the feedback indication signal, a propeller retraction control signal is generated through the safety monitoring module; In response to the pitch retraction control signal, the pitch actuator is controlled by the pitch retraction controller to perform pitch retraction. 2 . The method according to claim 1 , wherein, when the feedback indication signal is different from the preset signal, the safety monitoring module determines that the action of retracting the propellers needs to be triggered. 3 . 3. The method according to claim 2, wherein the safety monitoring module comprises a programmable logic controller and a safety relay, Wherein, the input of the programmable logic controller is connected with the output of the feedback signal generator, the output of the programmable logic controller is connected with the input of the safety relay, and the output of the safety relay is used as the output of the safety monitoring module. 4. The method according to claim 3, wherein the step of generating the control signal for retracting the propeller by the safety monitoring module comprises: When the feedback indication signal is different from the preset signal, the programmable logic controller generates and outputs a propeller retraction indication signal; In response to receiving the pitch retraction indication signal from the programmable logic controller, the safety relay is de-energized to generate the pitch retraction control signal. 5. The method of claim 4, wherein, In response to the pitch retraction control signal, the step of controlling the pitch actuator to perform pitch retraction through the pitch retraction controller includes: In response to the pitch retraction control signal, the pitch retraction controller controls the pitch actuator to perform pitch retraction by cutting off power. 6. The method of claim 3, further comprising: Receive a power-off signal or a propeller-retracting instruction signal from the main control of the wind turbine through the safety relay; In response to receiving a power-off signal or a propeller-retracting indication signal, the safety relay generates a propeller-retracting control signal by de-energizing, Wherein, in response to the pitch retraction control signal, the step of controlling the pitch actuator to perform pitch retraction through the pitch retraction controller includes: In response to the pitch retraction control signal, the pitch retraction controller controls the pitch actuator to perform pitch retraction by cutting off power. 7. The method according to any one of claims 2 to 6, wherein when the pitch actuator includes a hydraulic cylinder, the pitch retraction controller is implemented by an emergency feathering solenoid valve, and the feedback signal generator Detect the working state of the emergency feathering solenoid valve, and output the spool feedback indication signal of the emergency feathering solenoid valve as the feedback indication signal, Wherein, the emergency feathering solenoid valve is installed between the hydraulic cylinder and the accumulator. When the emergency feathering solenoid valve is powered off, the hydraulic cylinder relies on the driving force provided by the accumulator to perform the propeller retracting operation. 8. The method according to claim 7, wherein the number of emergency feathering solenoid valves is two, and when the spool feedback indication signal of any emergency feathering solenoid valve is different from the preset signal, the safety The monitoring module determines that the action of retracting the propellers needs to be triggered. 9. The method according to claim 7, wherein the step of the pitch retracting controller controlling the pitch actuator to execute the pitch retraction by powering off comprises: In response to power failure of the emergency feathering solenoid valve, the rodless chamber of the hydraulic cylinder is connected to the accumulator, and the rod chamber of the hydraulic cylinder is connected to the fuel tank to extend the cylinder rod, thereby triggering the retraction action. 10. The method according to any one of claims 1 to 6, wherein when the pitch actuator includes a DC motor, the pitch retraction controller is implemented by a contactor, and the feedback signal generator detects the contactor The working state of the normally closed contact, and output the status feedback indication signal of the normally closed contact of the contactor as the feedback indication signal, Among them, the contactor is installed between the DC motor and the backup power supply. When the coil of the contactor loses power, the normally closed contact of the contactor makes the DC motor and the backup power supply conductive, and the DC motor relies on the power provided by the backup power supply to perform recovery. paddle operation. 11. The method according to claim 10, wherein the step of the pitch retracting controller controlling the pitch actuator to perform pitch retraction by powering off comprises: In response to de-energizing the contactor coil, the normally closed contacts of the contactor close, thereby triggering the retraction action. 12. A device for improving the safety performance of a fan, characterized in that the device is installed on the pitch system of the fan, and the device includes: The feedback signal generator is configured to detect the working state of the pitch retracting controller in real time, and output a feedback indicating signal for indicating the working state; The safety monitoring module is configured to monitor the feedback indication signal output by the feedback signal generator in real time, wherein, when the safety monitoring module determines that the paddle retraction action needs to be triggered by monitoring the feedback indication signal, the safety monitoring module generates a paddle retraction control signal; The pitch retraction controller is configured to, in response to the pitch retraction control signal, control the pitch actuator to perform pitch retraction. 13 . The device according to claim 12 , wherein when the feedback indication signal is different from the preset signal, the safety monitoring module determines that the action of retracting the propellers needs to be triggered. 14 . 14. The device of claim 13, wherein the safety monitoring module comprises a programmable logic controller and a safety relay, Wherein, the input of the programmable logic controller is connected with the output of the feedback signal generator, the output of the programmable logic controller is connected with the input of the safety relay, and the output of the safety relay is used as the output of the safety monitoring module. 15. The device according to claim 14, wherein when the feedback indication signal is different from the preset signal, the programmable logic controller generates and outputs a propeller retraction indication signal; In response to receiving the pitch retraction indication signal from the programmable logic controller, the safety relay is de-energized to generate the pitch retraction control signal. 16. The device according to claim 15, wherein in response to the pitch retraction control signal, the pitch retraction controller controls the pitch actuator to perform pitch retraction by cutting off power. 17. The device according to claim 14, wherein the safety relay receives a power-off signal or a propeller retraction instruction signal from the main control of the fan; In response to receiving a power-off signal or a propeller-retracting indication signal, the safety relay generates the propeller-retracting control signal by de-energizing; In response to the pitch retraction control signal, the pitch retraction controller controls the pitch actuator to perform pitch retraction by cutting off power. 18. The device according to any one of claims 13 to 17, wherein when the pitch actuator includes a hydraulic cylinder, the pitch retraction controller is implemented by an emergency feathering solenoid valve, and the feedback signal generator Detect the working state of the emergency feathering solenoid valve, and output the spool feedback indication signal of the emergency feathering solenoid valve as the feedback indication signal, Wherein, the emergency feathering solenoid valve is installed between the hydraulic cylinder and the accumulator. When the emergency feathering solenoid valve is powered off, the hydraulic cylinder relies on the driving force provided by the accumulator to perform the propeller retracting operation. 19. The device according to claim 18, wherein the number of emergency feathering solenoid valves is two, and when the spool feedback indication signal of any emergency feathering solenoid valve is different from the preset signal, the safety The monitoring module determines that the action of retracting the propellers needs to be triggered. 20. The apparatus of claim 18, wherein in response to de-energization of the emergency feathering solenoid valve, the rodless chamber of the hydraulic cylinder is connected to the accumulator, and the rod chamber of the hydraulic cylinder is connected to the oil tank to connect The cylinder rod is extended, which triggers the propeller retraction action. 21. Apparatus as claimed in any one of claims 12 to 17, wherein When the pitch actuator includes a DC motor, the pitch retracting controller is implemented by a contactor, and the feedback signal generator detects the working state of the normally closed contact of the contactor, and outputs the status feedback indication signal of the normally closed contact of the contactor as the feedback indication signal, Among them, the contactor is installed between the DC motor and the backup power supply. When the coil of the contactor loses power, the normally closed contact of the contactor makes the DC motor and the backup power supply conductive, and the DC motor relies on the power provided by the backup power supply to perform recovery. paddle operation. 22. The apparatus of claim 21, wherein in response to de-energizing the contactor coil, a normally closed contact of the contactor closes, thereby triggering the retraction action. 23. A system comprising at least one computing device and at least one storage device storing instructions, wherein said instructions, when executed by said at least one computing device, cause said at least one computing device to perform as claimed in claim 1 The method for improving the safety performance of wind turbines according to any one of claims 1 to 11. 24. A computer-readable storage medium storing instructions, characterized in that, when said instructions are executed by at least one computing device, said at least one computing device is caused to execute any one of claims 1 to 11 The methods for improving the safety performance of wind turbines are described.

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