Valve control redundancy device for hydraulic servo-motor and valve control method

Abstract

The invention discloses a valve control redundancy module used for hydraulic servo-motor control and a valve control method, and relates to the field of industrial automation control, a valve control redundancy device comprises a set of valve control redundancy modules, and each valve control redundancy module comprises a signal acquisition unit used for acquiring real-time position signals of equipment to be subjected to valve control, converting the signal into a digital signal; the logic control unit is used for receiving the digital signal and calculating a valve adjusting quantity digital signal; the output control unit is used for receiving the valve adjusting quantity digital signal and performing signal processing to obtain a control signal for controlling the valve opening of the equipment to be subjected to valve control and performing control adjustment on the valve opening of the equipment to be subjected to valve control based on the control signal; the communication unit is used for receiving a module selection instruction and a target valve position signal sent by a preset controller; and the redundant communication unit is used for synchronous communication between the valve control redundant modules. The device can improve the stability of the steam turbine system.

Description

Technical Field

[0001] This invention relates to the field of industrial automation control, and in particular to a valve control redundancy module and valve control method for hydraulic actuator control. Background Technology

[0002] As a core power source, the accuracy and reliability of the steam turbine's control system are crucial. In industries such as power, chemical, and coal mining, hydraulic actuators drive turbine valves to regulate the turbine's output power. Therefore, the valve control system for these actuators requires extremely high accuracy, sensitivity, and reliability. Currently, the valve control system for hydraulic actuators uses a purely electrically adjustable DEH (Digital Electro-hydraulic Control System for Steam Turbines) servo system, which boasts advantages such as high response speed and high control precision. The purely electrically adjustable valve control module can compare the valve position setpoint with the real-time valve opening value collected by the displacement sensor, thereby achieving closed-loop control of the hydraulic actuator valves. However, current hydraulic actuator valve control systems mostly consist of multiple I / O cards and lack universal control equipment for driving LVDT (Linear Displacement Sensor) devices, resulting in low integration and flexibility, poor compatibility, high installation and maintenance costs, heavy workload, and inconvenience in use. Furthermore, existing servo modules are mostly single-point control systems lacking redundancy design; a module failure can paralyze the entire control system. Summary of the Invention

[0003] In view of this, the present invention provides a valve control redundancy device and valve control method for hydraulic actuators, the main purpose of which is to solve the problem of low safety factor caused by the current single-point control method for valve control.

[0004] To address the aforementioned problems, this application provides a valve control redundancy device for hydraulic actuators, comprising: A valve control redundancy device for hydraulic actuators, characterized in that the valve control redundancy device includes a set of valve control redundancy modules, each of the valve control redundancy modules including: a signal acquisition unit, a logic control unit, an output control unit, a communication unit, and a redundant communication unit; The signal acquisition unit is used to acquire the real-time position signal of the valve control device and perform signal processing on the real-time position signal to obtain a digital signal representing the real-time position signal. The logic control unit is used to receive the digital signal and perform calculations based on the digital signal, the module selection command sent by the preset controller forwarded by the communication unit, and the target valve position signal to obtain the valve adjustment amount digital signal. The output control unit is used to receive the valve adjustment amount digital signal, perform signal processing based on the valve adjustment amount digital signal to obtain a control signal for controlling the valve opening of the device to be controlled, and control and adjust the valve opening of the device to be controlled based on the control signal. The communication unit is used to receive module selection instructions and target valve position signals sent by the preset controller; The redundant communication unit is used for synchronous communication between the various valve control redundant modules.

[0005] Optionally, the device further includes an overspeed signal measurement circuit and a valve disconnection detection circuit; The overspeed signal measurement circuit is electrically connected to the logic control unit and is used to receive the switching signal sent by the turbine overspeed measurement device. When the switching signal is in the on state, an overspeed feedback signal is generated and sent to the logic control unit. The valve disconnection detection circuit is electrically connected to the logic control unit and is used to detect the valve status. When the valve status is detected as disconnected or faulty, the detection result is sent to the logic control unit.

[0006] Optionally, the signal acquisition unit is electrically connected to the logic control unit, and the signal acquisition unit includes an LVDT demodulation circuit, a current transmitter acquisition circuit, an acquisition mode selection circuit, and a first analog-to-digital conversion circuit. The LVDT demodulation circuit is electrically connected to the displacement sensor used to acquire the real-time position signal of the valve control device and the acquisition mode selection circuit. The LVDT demodulation circuit is used to receive the initial first sine wave signal of the hydraulic valve position acquired by the LVDT displacement sensor and demodulate the initial first sine wave signal to obtain a voltage signal. The current transmitter acquisition circuit is electrically connected to the transmitter used to acquire the real-time position signal of the valve control device and the acquisition mode selection circuit. The current transmitter acquisition circuit is used to receive the initial second sine wave signal of the position of the hydraulic valve sent by the transmitter, and to process the initial second sine wave signal to obtain the current signal. The output terminal of the acquisition mode selection circuit is electrically connected to the first analog-to-digital conversion circuit. The acquisition mode selection circuit is used to receive the voltage signal or the current signal, and convert the voltage signal or the current signal to obtain a digital signal representing the real-time position signal.

[0007] Optionally, the output control unit includes a valve control output circuit; The valve control output circuit includes a second analog-to-digital conversion circuit, a first signal amplification circuit, and a jumper cap mode selection circuit. The input terminal of the second analog-to-digital converter is electrically connected to the logic control unit. The second analog-to-digital converter is used to receive the valve adjustment amount digital signal output by the logic control unit and perform analog-to-digital conversion on the valve adjustment amount digital signal to obtain the valve adjustment amount analog signal. The output terminal of the second analog-to-digital converter is electrically connected to the input terminal of the first signal amplification circuit. The first signal amplification circuit is used to receive the analog signal of the valve adjustment amount and amplify the analog signal of the valve adjustment amount to obtain a first amplified signal. The output terminal of the first signal amplification circuit is electrically connected to the input terminal of the jumper cap mode selection circuit. The jumper cap mode selection circuit is used to select the control signal mode in the manner of a jumper cap according to the operating mode of the valve to be controlled, so as to obtain a target control signal that matches the operating mode, and to use the target control signal to control and adjust the valve opening of the valve to be controlled.

[0008] Optionally, the output control unit further includes a valve opening monitoring output circuit; The valve opening monitoring output circuit includes a third analog-to-digital conversion circuit and a second signal amplification circuit. The input terminal of the third analog-to-digital converter circuit is electrically connected to the logic control unit. The third analog-to-digital converter circuit is used to receive the valve adjustment amount digital signal output by the logic control unit and to perform signal conversion on the valve adjustment amount digital signal to obtain a current analog signal. The input terminal of the second signal amplification circuit is electrically connected to the output terminal of the third analog-to-digital conversion circuit, and the output terminal of the second signal amplification circuit is electrically connected to the preset valve opening monitoring device. The second signal amplification circuit is used to receive the current analog signal and amplify the current analog signal to obtain the target current signal, so as to monitor the valve opening based on the target current signal.

[0009] Optionally, the redundant communication unit uses a full-duplex communication mode based on the RS422 protocol for synchronous communication.

[0010] To address the aforementioned problems, this application provides a valve control method for a hydraulic actuator, applied to the redundant valve control device for the hydraulic actuator, comprising: The signal acquisition unit of the valve control redundancy device acquires the real-time position signal of the device to be controlled by the valve, and performs signal processing on the real-time position signal to obtain a digital signal representing the real-time position signal; The logic control unit of the valve control redundancy device receives the digital signal and performs calculations based on the digital signal, the module selection command sent by the preset controller forwarded by the communication unit, and the target valve position signal to obtain the valve adjustment amount digital signal. The output control unit of the valve control redundancy device receives the valve adjustment amount digital signal, performs signal processing based on the valve adjustment amount digital signal to obtain a control signal for controlling the valve opening of the device to be controlled, and controls and adjusts the valve opening of the device to be controlled based on the control signal.

[0011] Optionally, the logic control unit employing the valve control redundancy device receives the digital signal and performs calculations based on the digital signal, the module selection command sent by the preset controller forwarded by the communication unit, and the target valve position signal to obtain a digital signal of valve adjustment amount, specifically including: Based on the module selection instruction, the digital signals output by the signal acquisition unit of each valve control redundancy module of the valve control redundancy device are filtered to obtain the target digital signal representing the real-time position signal of the device to be controlled by the valve. The deviation value is obtained by performing a subtraction operation based on the target digital signal and the target valve position signal; Based on the deviation value, a PID control algorithm is used to perform proportional-integral calculations to obtain the digital signal of the valve adjustment amount.

[0012] Optionally, the output control unit employing the valve control redundancy device receives the valve adjustment amount digital signal and performs signal processing based on the valve adjustment amount digital signal to obtain a control signal for controlling the valve opening of the device to be controlled, specifically including: The second analog-to-digital converter circuit of the valve control output circuit receives the digital signal of valve adjustment amount output by the logic control unit, and performs analog-to-digital conversion on the digital signal of valve adjustment amount to obtain an analog signal of valve adjustment amount; The first signal amplification circuit of the valve control output circuit receives the analog signal of valve adjustment and amplifies the analog signal of valve adjustment to obtain the first amplified signal; The jumper cap mode selection circuit of the valve control output circuit selects the control signal mode according to the operating mode of the device to be controlled by the valve using the jumper cap method, so as to obtain a target control signal that matches the operating mode, and then uses the target control signal to control and adjust the valve opening of the device to be controlled by the valve.

[0013] To address the aforementioned problems, this application provides a valve control device, comprising a valve control redundancy device for a hydraulic actuator as described in any one of claims 1-7, a base connection controller, and a dedicated redundant base; the valve control redundancy device is electrically connected to the dedicated redundant base via the base connection controller; the communication unit of the valve control redundancy device is electrically connected to the controller via the interface of the dedicated redundant base; the signal acquisition unit of the valve control redundancy device is electrically connected to an LVDT sensor or transmitter via the interface of the dedicated redundant base; the redundant communication units of a set of valve control redundancy modules of the valve control redundancy device are connected via the dedicated base, and synchronous communication is performed in full-duplex mode using the RS422 protocol for real-time data exchange.

[0014] The beneficial effects of this application are as follows: The valve control redundancy device of this application has been optimized and upgraded, integrating all relevant I / O channels into one module. The modular design reduces the size and facilitates on-site maintenance and replacement. It supports the selection of different types of control signals, adapting to the control of local equipment in different sites, enhancing the system's flexibility and ease of maintenance. Simultaneously, the redundancy configuration improves system reliability; even if the main module fails, the backup module can immediately take over control, ensuring continuous system operation. This valve control redundancy device is designed according to the safety design and relevant standards of the turbine DEH servo control system. By integrating multiple I / O channels on a single control module, and achieving compatibility between voltage and current mode outputs through jumper caps, it achieves compatibility with different controlled devices in different sites, while also greatly improving the flexibility and integration of engineering design. This valve control redundancy device can be used redundantly on a dedicated base. Each module controls one LVDT, and the LVDT sensor can provide feedback on the position of the hydraulic actuator valve. Through data interaction between redundant modules, the redundancy design of valve control is achieved, reducing the possibility of turbine valve fluctuations caused by improper configuration of LVDTs, control modules, and other devices in the control system, thereby improving the reliability and stability of the turbine DEH system.

[0015] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of the circuit structure of a valve control redundancy device for a hydraulic actuator provided in an embodiment of this application is shown. Figure 2 A schematic diagram of the circuit structure of a signal acquisition unit for a valve control redundancy device for a hydraulic actuator, provided in an embodiment of this application, is shown. Figure 3 This paper shows a schematic diagram of the valve control output circuit of the output control unit of a valve control redundancy device for a hydraulic actuator provided in an embodiment of this application. Figure 4 This paper shows a schematic diagram of the valve opening monitoring output circuit of the output control unit of a valve control redundancy device for a hydraulic actuator provided in an embodiment of this application. Figure 5 A flowchart of a hydraulic actuator valve control method according to another embodiment of this application is shown; Figure 6 This illustration shows a valve control logic diagram of a logic control unit for a valve control redundancy device for a hydraulic actuator, as provided in an embodiment of this application. Detailed Implementation

[0017] Various embodiments and features of this application are described herein with reference to the accompanying drawings.

[0018] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this application will be apparent to those skilled in the art.

[0019] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0020] These and other features of this application will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0021] It should also be understood that although this application has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this application.

[0022] The above and other aspects, features and advantages of this application will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0023] Specific embodiments of this application are described thereafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this application, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the application. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as the basis and representative basis for the claims to teach those skilled in the art to use this application in a variety of substantially any suitable detailed structures.

[0024] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to this application.

[0025] This application provides a valve control redundancy device 10 for a hydraulic actuator, characterized in that the valve control redundancy device includes a set of valve control redundancy modules, such as... Figure 1 As shown, a set of valve control redundant modules are module 1 and module 2. Each valve control redundant module includes: a signal acquisition unit 11, a logic control unit 12, an output control unit 13, a communication unit 14, and a redundant communication unit 15. The signal acquisition unit 11 is used to acquire the real-time position signal of the valve control device and perform signal processing on the real-time position signal to obtain a digital signal representing the real-time position signal. The logic control unit 12 is used to receive the digital signal and perform calculations based on the digital signal, the module selection command sent by the preset controller forwarded by the communication unit, and the target valve position signal to obtain the valve adjustment amount digital signal. The output control unit 13 is used to receive the valve adjustment amount digital signal, and perform signal processing according to the valve adjustment amount digital signal to obtain a control signal for controlling the valve opening of the device to be controlled, and control and adjust the valve opening of the device to be controlled based on the control signal. The communication unit 14 is used to receive the module selection command and the target valve position signal sent by the preset controller; The redundant communication unit 15 is used for synchronous communication between the various valve control redundant modules.

[0026] In specific implementation, the device also includes an overspeed signal measurement circuit 16 and a valve disconnection detection circuit 17; The overspeed signal measurement circuit 16 is electrically connected to the logic control unit 12 and is used to receive the switching signal sent by the turbine overspeed measurement device. When the switching signal is in the on state, an overspeed feedback signal is generated and sent to the logic control unit 12. In specific implementation, the overspeed signal measurement circuit can be a 110%AST dry contact input switch quantity detection circuit, used to detect the switch quantity signal issued by the turbine overspeed measurement device. When the input dry contact signal is set to 1, the circuit outputs a high-level feedback signal to the MCU of the logic control unit.

[0027] The valve disconnection detection circuit 17 is electrically connected to the logic control unit 12 and is used to detect the valve status. When the valve status is detected as disconnected or faulty, the detection result is sent to the logic control unit.

[0028] In specific implementation, the signal acquisition unit 11 is electrically connected to the logic control unit 12, such as... Figure 2 The signal acquisition unit 11 shown includes an LVDT demodulation circuit 111, a current transmitter acquisition circuit 112, an acquisition mode selection circuit 113, and a first analog-to-digital conversion circuit 114. The LVDT demodulation circuit 111 is electrically connected to the displacement sensor used to acquire the real-time position signal of the valve control device and the acquisition mode selection circuit 113. The LVDT demodulation circuit 111 is used to receive the initial first sine wave signal of the hydraulic valve position acquired by the LVDT displacement sensor and demodulate the initial first sine wave signal to obtain a voltage signal. The current transmitter acquisition circuit 112 is electrically connected to the transmitter used to acquire the real-time position signal of the valve control device and the acquisition mode selection circuit 113. The current transmitter acquisition circuit is used to receive the initial second sine wave signal of the position of the hydraulic valve sent by the transmitter, and to process the initial second sine wave signal to obtain the current signal. The output of the acquisition mode selection circuit is electrically connected to the first analog-to-digital conversion circuit. The acquisition mode selection circuit receives the voltage signal or the current signal and converts the voltage signal or the current signal to obtain a digital signal representing the real-time position signal. In field use, either the LVDT sensor or the transmitter can be selected to provide feedback on the position of the hydraulic valve; LVDT sensors are generally more commonly used. The controller controls the acquisition of values ​​from the LVDT sensor or transmitter by preset selection of either the LVDT mode or the transmitter mode. The position information acquired by the LVDT sensor is converted into a digital signal recognizable by the MCU through the LVDT demodulation circuit and analog-to-digital conversion circuit of the signal acquisition unit and transmitted to the logic control unit; the position information acquired by the transmitter is converted into a digital signal through the analog-to-digital conversion circuit and transmitted to the logic control unit. In the specific implementation process, such as Figure 3 As shown, the output control unit 13 includes a valve control output circuit; The valve control output circuit includes a second analog-to-digital conversion circuit 131, a first signal amplification circuit 132, and a jumper cap mode selection circuit 133. The input terminal of the second analog-to-digital converter circuit 131 is electrically connected to the logic control unit 12. The second analog-to-digital converter circuit 131 is used to receive the valve adjustment amount digital signal output by the logic control unit 12 and perform analog-to-digital conversion on the valve adjustment amount digital signal to obtain the valve adjustment amount analog signal. The output terminal of the second analog-to-digital converter circuit 131 is electrically connected to the input terminal of the first signal amplification circuit 132. The first signal amplification circuit 132 is used to receive the valve adjustment amount analog signal and amplify the valve adjustment amount analog signal to obtain a first amplified signal. The output of the first signal amplification circuit 132 is electrically connected to the input of the jumper cap mode selection circuit 133. The jumper cap mode selection circuit 133 is used to select the control signal mode according to the operating mode of the device to be controlled by the valve using a jumper cap, thereby obtaining a target control signal that matches the operating mode. The target control signal is then used to control and adjust the valve opening of the device to be controlled. The logic control unit simultaneously receives the target position from the controller and the real-time position measurement result transmitted by the signal acquisition unit. The two values ​​are compared, and proportional-integral calculation is performed through the built-in PI (calculus) soft algorithm logic. The output is then a control signal that controls the valve to adjust in real time. This control signal is sent to the valve control output circuit in the output control unit. The valve control output circuit generates a valve control signal that drives the valve by converting the control signal sent by the logic control unit into a digital-to-analog converter and amplifying the signal. This control signal supports current mode and voltage mode output, and the mode can be selected using a jumper cap. The valve control signal is connected to the hydraulic valve through the base interface to realize valve control.

[0029] In the specific implementation process, such as Figure 4 As shown, the output control unit 13 also includes a valve opening monitoring output circuit; The valve opening monitoring output circuit includes a third analog-to-digital converter circuit 134 and a second signal amplifier circuit 135. The input terminal of the third analog-to-digital converter circuit 134 is electrically connected to the logic control unit 12. The third analog-to-digital converter circuit 134 is used to receive the valve adjustment amount digital signal output by the logic control unit 1, and to perform signal conversion on the valve adjustment amount digital signal to obtain a current analog signal. The input terminal of the second signal amplification circuit 135 is electrically connected to the output terminal of the third analog-to-digital conversion circuit 134, and the output terminal of the second signal amplification circuit 135 is electrically connected to a preset valve opening monitoring device. The second signal amplification circuit 135 is used to receive the current analog signal and amplify the current analog signal to obtain a target current signal, so as to monitor the valve opening based on the target current signal. The valve opening monitoring output circuit is connected to the logic control unit and converts the position information collected in the signal processing unit into a current output signal. This current signal can provide real-time feedback on the valve opening, thereby realizing valve opening monitoring.

[0030] In the specific implementation process, the redundant communication unit adopts a full-duplex communication mode based on the RS422 protocol for synchronous communication.

[0031] This valve control redundancy module adds multiple monitoring and protection functions, supporting open circuit detection and valve opening monitoring. It can receive overspeed signals from the turbine speed control module and perform corresponding valve control. The valve open circuit detection circuit in the signal acquisition unit collects current signals through the sampling resistor of the valve control output circuit, converts them from analog to digital, and sends them to the logic control unit to achieve valve open circuit detection. The valve opening monitoring output circuit of the output control unit is connected to the logic control unit, converting the position information collected in the signal processing unit into a 4-20mA analog output signal through digital-to-analog conversion and signal amplification. This current signal can provide real-time feedback on the valve opening, achieving valve opening monitoring. The turbine overspeed signal measurement circuit detects the switching signal issued by the turbine overspeed measuring device. When the input dry contact signal is set to 1, the circuit outputs a high-level feedback signal to the MCU of the logic control unit, implementing valve control safety protection through a preset logic program.

[0032] Through the above implementation methods, this solution achieves precise control of turbine valves, and improves system stability and reliability through a dual-redundancy design. It is also compatible with LVDT and transmitter input methods, and with ±50mA current output and ±10V voltage output methods for valve control, increasing compatibility and flexibility. Each analog input / output channel uses a high-performance, high-precision analog-to-digital or digital-to-analog chip for conversion, meeting the requirements of 0.1% accuracy under normal operating conditions and 0.3% accuracy under harsh conditions. The protection circuits and filtering algorithms designed in the module circuitry ensure that EMC anti-interference performance meets the CE certification Level 3 requirements. This improves the level of industrial automation control.

[0033] This application presents an optimized and upgraded valve control redundancy device, integrating all relevant I / O channels into a single module. The modular design reduces size and facilitates on-site maintenance and replacement. It supports different types of control signals, adapting to local equipment control in various environments, enhancing system flexibility and ease of maintenance. Redundancy also improves system reliability; even if the main module fails, the backup module can immediately take over control, ensuring continuous system operation. This valve control redundancy device is designed according to the safety design and relevant standards of the turbine DEH servo control system. By integrating multiple I / O channels on a single control module and enabling compatibility between voltage and current mode outputs via jumper caps, it achieves compatibility with different controlled devices in different environments, significantly improving the flexibility and integration of engineering design. This valve control redundancy device can be used redundantly on a dedicated base. Each module controls one LVDT (Low Voltage Detector), and the LVDT sensor provides feedback on the position of the hydraulic actuator valve. Through data interaction between redundant modules, the valve control redundancy design is achieved, reducing the possibility of turbine valve fluctuations caused by improper configuration of LVDTs, control modules, and other devices in the control system, thereby improving the reliability and stability of the turbine DEH system.

[0034] Another embodiment of this application provides a method for controlling a hydraulic actuator valve, such as... Figure 5 As shown, it includes: Step S101: The signal acquisition unit of the valve control redundancy device acquires the real-time position signal of the device to be controlled by the valve, and performs signal processing on the real-time position signal to obtain a digital signal representing the real-time position signal; In the specific implementation process, the LVDT demodulation circuit of the signal acquisition unit receives the initial first sine wave signal of the hydraulic actuator valve position acquired by the LVDT displacement sensor, and demodulates the initial first sine wave signal to obtain a voltage signal; the current transmitter acquisition circuit of the signal acquisition unit receives the initial second sine wave signal of the hydraulic actuator valve position sent by the transmitter, and processes the initial second sine wave signal to obtain a current signal; the acquisition mode selection circuit of the signal acquisition unit receives either the voltage signal or the current signal, and converts the voltage signal or the current signal to obtain a digital signal representing the real-time position signal. In specific applications, the signal acquisition unit connects to the LVDT sensor or transmitter through a base interface. Either the LVDT sensor or the transmitter can be selected in the field to provide feedback on the position of the hydraulic actuator valve. LVDT sensors are generally more commonly used. The controller controls the acquisition of values ​​from the LVDT sensor or transmitter by preset selection of either the LVDT mode or the transmitter mode. The position information acquired by the LVDT sensor is converted into a digital signal recognizable by the MCU through the LVDT demodulation circuit and analog-to-digital conversion circuit of the signal acquisition unit and transmitted to the logic control unit; the position information acquired by the transmitter is converted into a digital signal through the analog-to-digital conversion circuit and transmitted to the logic control unit.

[0035] Step S102: The logic control unit of the valve control redundancy device receives the digital signal and performs calculations based on the digital signal, the module selection command sent by the preset controller forwarded by the communication unit, and the target valve position signal to obtain the valve adjustment amount digital signal. In the specific implementation process, based on the module selection instruction, the digital signals output by the signal acquisition units of each valve control redundancy module of the valve control redundancy device are filtered to obtain the target digital signal representing the real-time position signal of the device to be controlled by the valve; specifically, the valve control logic of the logic control unit is as follows: Figure 6As shown, the digital signals acquired by the signal acquisition unit of a set of redundant valve control modules are filtered, and the larger digital signal among them is determined as the target digital signal. A subtraction operation is performed between the target digital signal and the target valve position signal to obtain the deviation value. Based on the deviation value, a PID control algorithm is used to perform proportional-integral calculations to obtain the valve adjustment digital signal. The redundant communication units of the two redundant valve control modules are connected via a dedicated base and use RS422 protocol full-duplex mode for synchronous communication, enabling real-time data interaction between the two redundant valve control modules. The two redundant valve control modules operate in master and backup modes. Each module independently acquires position information, but the valve control output of the backup module follows the output of the master module. The two modules switch between master and backup states according to the switching logic preset by the logic control unit. Even when switching between master and backup occurs or the master module fails, a seamless switching is guaranteed, ensuring continuous system operation.

[0036] Step S103: The output control unit of the valve control redundancy device receives the valve adjustment amount digital signal, performs signal processing based on the valve adjustment amount digital signal to obtain a control signal for controlling the valve opening of the device to be controlled, and controls and adjusts the valve opening of the device to be controlled based on the control signal.

[0037] In the specific implementation process, the second analog-to-digital converter of the valve control output circuit receives the digital signal of valve adjustment amount output by the logic control unit, and performs analog-to-digital conversion on the digital signal of valve adjustment amount to obtain an analog signal of valve adjustment amount; the first signal amplification circuit of the valve control output circuit receives the analog signal of valve adjustment amount and amplifies the analog signal of valve adjustment amount to obtain a first amplified signal; the jumper cap mode selection circuit of the valve control output circuit selects the control signal mode according to the operating mode of the device to be controlled by the valve using a jumper cap, and obtains a target control signal that matches the operating mode, so as to control and adjust the valve opening of the device to be controlled by the valve using the target control signal.

[0038] This application presents an optimized and upgraded valve control redundancy device, integrating all relevant I / O channels into a single module. The modular design reduces size and facilitates on-site maintenance and replacement. It supports different types of control signals, adapting to local equipment control in various environments, enhancing system flexibility and ease of maintenance. Redundancy also improves system reliability; even if the main module fails, the backup module can immediately take over control, ensuring continuous system operation. This valve control redundancy device is designed according to the safety design and relevant standards of the turbine DEH servo control system. By integrating multiple I / O channels on a single control module and enabling compatibility between voltage and current mode outputs via jumper caps, it achieves compatibility with different controlled devices in different environments, significantly improving the flexibility and integration of engineering design. This valve control redundancy device can be used redundantly on a dedicated base. Each module controls one LVDT (Low Voltage Detector), and the LVDT sensor provides feedback on the position of the hydraulic actuator valve. Through data interaction between redundant modules, the valve control redundancy design is achieved, reducing the possibility of turbine valve fluctuations caused by improper configuration of LVDTs, control modules, and other devices in the control system, thereby improving the reliability and stability of the turbine DEH system.

[0039] Another embodiment of this application provides a valve control device, including a valve control redundancy device for a hydraulic actuator, a base connection controller, and a dedicated redundant base; the valve control redundancy device is electrically connected to the dedicated redundant base via the base connection controller; the communication unit of the valve control redundancy device is electrically connected to the controller via the interface of the dedicated redundant base; the signal acquisition unit of the valve control redundancy device is electrically connected to an LVDT sensor or transmitter via the interface of the dedicated redundant base; the redundant communication units of a group of valve control redundancy modules of the valve control redundancy device are connected via the dedicated base, and synchronous communication is performed in full-duplex mode using the RS422 protocol for real-time data exchange.

[0040] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A valve control redundancy device for a hydraulic actuator, characterized in that, The valve control redundancy device includes a set of valve control redundancy modules, each of which includes: a signal acquisition unit, a logic control unit, an output control unit, a communication unit, and a redundant communication unit; The signal acquisition unit is used to acquire the real-time position signal of the valve control device and perform signal processing on the real-time position signal to obtain a digital signal representing the real-time position signal. The logic control unit is used to receive the digital signal and perform calculations based on the digital signal, the module selection command sent by the preset controller forwarded by the communication unit, and the target valve position signal to obtain the valve adjustment amount digital signal. The output control unit is used to receive the valve adjustment amount digital signal, perform signal processing based on the valve adjustment amount digital signal to obtain a control signal for controlling the valve opening of the device to be controlled, and control and adjust the valve opening of the device to be controlled based on the control signal. The communication unit is used to receive module selection instructions and target valve position signals sent by the preset controller; The redundant communication unit is used for synchronous communication between the various valve control redundant modules.

2. The apparatus as claimed in claim 1, characterized in that, The device also includes an overspeed signal measurement circuit and a valve wire breakage detection circuit; The overspeed signal measurement circuit is electrically connected to the logic control unit and is used to receive the switching signal sent by the turbine overspeed measurement device. When the switching signal is in the on state, an overspeed feedback signal is generated and sent to the logic control unit. The valve disconnection detection circuit is electrically connected to the logic control unit and is used to detect the valve status. When the valve status is detected as disconnected or faulty, the detection result is sent to the logic control unit.

3. The apparatus as described in claim 1, characterized in that, The signal acquisition unit is electrically connected to the logic control unit. The signal acquisition unit includes an LVDT demodulation circuit, a current transmitter acquisition circuit, an acquisition mode selection circuit, and a first analog-to-digital conversion circuit. The LVDT demodulation circuit is electrically connected to the displacement sensor used to acquire the real-time position signal of the valve control device and the acquisition mode selection circuit. The LVDT demodulation circuit is used to receive the initial first sine wave signal of the hydraulic valve position acquired by the LVDT displacement sensor and demodulate the initial first sine wave signal to obtain a voltage signal. The current transmitter acquisition circuit is electrically connected to the transmitter used to acquire the real-time position signal of the valve control device and the acquisition mode selection circuit. The current transmitter acquisition circuit is used to receive the initial second sine wave signal of the position of the hydraulic valve sent by the transmitter, and to process the initial second sine wave signal to obtain the current signal. The output terminal of the acquisition mode selection circuit is electrically connected to the first analog-to-digital conversion circuit. The acquisition mode selection circuit is used to receive the voltage signal or the current signal, and convert the voltage signal or the current signal to obtain a digital signal representing the real-time position signal.

4. The apparatus as claimed in claim 1, characterized in that, The output control unit includes a valve control output circuit; The valve control output circuit includes a second analog-to-digital conversion circuit, a first signal amplification circuit, and a jumper cap mode selection circuit. The input terminal of the second analog-to-digital converter is electrically connected to the logic control unit. The second analog-to-digital converter is used to receive the valve adjustment amount digital signal output by the logic control unit and perform analog-to-digital conversion on the valve adjustment amount digital signal to obtain the valve adjustment amount analog signal. The output terminal of the second analog-to-digital converter is electrically connected to the input terminal of the first signal amplification circuit. The first signal amplification circuit is used to receive the analog signal of the valve adjustment amount and amplify the analog signal of the valve adjustment amount to obtain a first amplified signal. The output terminal of the first signal amplification circuit is electrically connected to the input terminal of the jumper cap mode selection circuit. The jumper cap mode selection circuit is used to select the control signal mode in the manner of a jumper cap according to the operating mode of the valve to be controlled, so as to obtain a target control signal that matches the operating mode, and to use the target control signal to control and adjust the valve opening of the valve to be controlled.

5. The apparatus as claimed in claim 1, characterized in that, The output control unit also includes a valve opening monitoring output circuit; The valve opening monitoring output circuit includes a third analog-to-digital conversion circuit and a second signal amplification circuit. The input terminal of the third analog-to-digital converter circuit is electrically connected to the logic control unit. The third analog-to-digital converter circuit is used to receive the valve adjustment amount digital signal output by the logic control unit and to perform signal conversion on the valve adjustment amount digital signal to obtain a current analog signal. The input terminal of the second signal amplification circuit is electrically connected to the output terminal of the third analog-to-digital conversion circuit, and the output terminal of the second signal amplification circuit is electrically connected to the preset valve opening monitoring device. The second signal amplification circuit is used to receive the current analog signal and amplify the current analog signal to obtain the target current signal, so as to monitor the valve opening based on the target current signal.

6. The apparatus as claimed in claim 1, characterized in that, The redundant communication unit uses a full-duplex communication mode based on the RS422 protocol for synchronous communication.

7. A valve control method for a hydraulic actuator, applied to the valve control redundancy device for the hydraulic actuator, characterized in that, include: The signal acquisition unit of the valve control redundancy device acquires the real-time position signal of the device to be controlled by the valve, and performs signal processing on the real-time position signal to obtain a digital signal representing the real-time position signal; The logic control unit of the valve control redundancy device receives the digital signal and performs calculations based on the digital signal, the module selection command sent by the preset controller forwarded by the communication unit, and the target valve position signal to obtain the valve adjustment amount digital signal. The output control unit of the valve control redundancy device receives the valve adjustment amount digital signal, performs signal processing based on the valve adjustment amount digital signal to obtain a control signal for controlling the valve opening of the device to be controlled, and controls and adjusts the valve opening of the device to be controlled based on the control signal.

8. The method as described in claim 7, characterized in that, The logic control unit employing the valve control redundancy device receives the digital signal and performs calculations based on the digital signal, the module selection command sent by the preset controller forwarded by the communication unit, and the target valve position signal to obtain the valve adjustment amount digital signal, specifically including: Based on the module selection instruction, the digital signals output by the signal acquisition unit of each valve control redundancy module of the valve control redundancy device are filtered to obtain the target digital signal representing the real-time position signal of the device to be controlled by the valve. The deviation value is obtained by performing a subtraction operation based on the target digital signal and the target valve position signal; Based on the deviation value, a PID control algorithm is used to perform proportional-integral calculations to obtain the digital signal of the valve adjustment amount.

9. The method as described in claim 7, characterized in that, The output control unit of the valve control redundancy device receives the valve adjustment digital signal and performs signal processing based on the valve adjustment digital signal to obtain a control signal for controlling the valve opening of the device to be controlled, specifically including: The second analog-to-digital converter circuit of the valve control output circuit receives the digital signal of valve adjustment amount output by the logic control unit, and performs analog-to-digital conversion on the digital signal of valve adjustment amount to obtain an analog signal of valve adjustment amount; The first signal amplification circuit of the valve control output circuit receives the analog signal of valve adjustment and amplifies the analog signal of valve adjustment to obtain the first amplified signal; The jumper cap mode selection circuit of the valve control output circuit selects the control signal mode according to the operating mode of the device to be controlled by the valve using the jumper cap method, so as to obtain a target control signal that matches the operating mode, and then uses the target control signal to control and adjust the valve opening of the device to be controlled by the valve.

10. A valve control device, characterized in that, The device includes a valve control redundancy device for hydraulic actuators as described in any one of claims 1-7, a base connection controller, and a dedicated redundant base; the valve control redundancy device is electrically connected to the dedicated redundant base via the base connection controller; the communication unit of the valve control redundancy device is electrically connected to the controller via the interface of the dedicated redundant base; the signal acquisition unit of the valve control redundancy device is electrically connected to an LVDT sensor or transmitter via the interface of the dedicated redundant base; the redundant communication units of a group of valve control redundancy modules of the valve control redundancy device are connected via the dedicated base, and synchronous communication is performed in full-duplex mode using the RS422 protocol for real-time data exchange.

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