Improved water turbine guide vane position measuring method and system

Abstract

The invention discloses an improved water turbine guide vane position measuring method and system, and belongs to the technical field of accurate measurement of a water turbine control system.The improved water turbine guide vane position measuring method comprises the steps that a passive pull rope type displacement sensor is installed on a water turbine main servomotor to monitor guide vane operation data; guide vane operation data are converted into analog signals through a pull rope sensor; the collected analog signals are converted into digital signals through an analog quantity input AI module, and optimization processing is carried out on the digital signals; and transmitting the optimized data to a digital output (DO) module through a data bus, generating a control signal, and measuring the position of the guide vane of the water turbine. The device replaces a traditional water turbine guide vane position signal measurement mode and is used for equipment such as a computer monitoring system, the accuracy of water turbine guide vane position signal measurement is improved, the labor intensity of overhaul and maintenance personnel is relieved, and the success rate of automatic starting is increased.

Description

Technical Field

[0001] The invention relates to the technical field of accurate measurement of a water turbine control system, and in particular to an improved water turbine guide vane position measurement method and system. Background Art

[0002] As a key equipment in the field of renewable energy, the operating efficiency and reliability of turbines are crucial to the stability and economy of the entire power system. In the control system of turbines, the accuracy of guide vane position measurement directly affects the energy conversion efficiency and safety of turbines. Traditional methods for measuring guide vane position of turbines mostly use mechanical or electromagnetic sensors, which can meet basic measurement needs to a certain extent. However, with the advancement of technology and the increasing requirements of power systems for precise control, these traditional methods have gradually exposed their limitations.

[0003] One of the traditional methods of measuring the position of the guide vanes of the turbine and collecting signals is the main controller. The typical structure is to use a cam mechanism corresponding to the stroke of the relay to control the on and off of the contacts at the corresponding position. This measuring device has a complex structure, is difficult to adjust the guide vane position, and is very inconvenient to maintain. The second is a mechanical travel switch. The measurement accuracy of this position measurement method depends on the installation and fixing position of the travel switch. It needs to be repositioned after disassembly and assembly. It has poor reliability, is prone to fatigue and rust, is inconvenient to install, and is difficult to adjust the guide vane position. When installed in the waterwheel room, it is affected by vibration and is easy to loosen and fall off. The accuracy and reliability of these measurement and position signal collection methods are limited by the installation and fixing conditions of the turbine room. They can only roughly reflect the position of the turbine guide vanes, and are difficult to adjust and position, which prolongs the start-up preparation time.

[0004] In view of the shortcomings of the prior art, the improved method for measuring the position of a guide vane of a water turbine proposed in the present invention realizes accurate monitoring of the guide vane operation data by installing a passive pull-rope displacement sensor on the main servomotor of the water turbine. Summary of the invention

[0005] In view of the above existing problems, the purpose of the present invention is to provide a high-precision and high-reliability guide vane position measurement method, which accurately converts the guide vane operation data into digital signals and optimizes the processing through a passive pull-wire displacement sensor and an analog input AI module, thereby improving the measurement accuracy and enhancing the stability and anti-interference ability of the signal. In addition, by establishing a comprehensive signal of historical and real-time data, performing dynamic fitting and error feedback, real-time monitoring and feedback adjustment are achieved, the influence of environmental factors on the guide vane position is taken into account, and the control signal output threshold is adjusted to ensure the effectiveness of the control signal, solving the technical difficulties of slow response speed, untimely adjustment, and inconsistency between the control command and the actual position in the traditional method.

[0006] In order to solve the above technical problems, an improved method for measuring the position of guide vanes of a water turbine is proposed, including:

[0007] A passive pull-rope displacement sensor is installed on the main relay of the turbine to monitor the guide vane operation data; the guide vane operation data is converted into an analog signal through the pull-rope sensor; the collected analog signal is converted into a digital signal through the analog input AI module and optimized; the optimized data is transmitted to the digital output DO module through the data bus to generate a control signal and measure the position of the turbine guide vane.

[0008] As a preferred solution of the improved method for measuring the position of guide vanes of a water turbine described in the present invention, the operating data includes: installing a passive rope-type guide vane displacement sensor on the main servomotor of the water turbine, and obtaining the guide vane operating data including the guide vane opening angle, guide vane displacement, vibration data of the guide vane and the supporting structure, and the temperature of the water turbine and the guide vane;

[0009] Environmental data including water flow direction, eddy current data, water flow velocity, water level data, turbine speed, and water pressure data around the guide vanes are simultaneously monitored at the installation location of the passive pull-wire displacement sensor.

[0010] As a preferred solution of the improved turbine guide vane position measurement method described in the present invention, the simulation signal includes establishing a guide vane state data set containing historical operation conditions {A h , D h , V h , T h} and assign their respective weight coefficients to form the historical comprehensive signal S com，h , for S com，h Standardize the guide vane travel data and convert it into an analog signal S of 4mA to 20mA nor，h ;

[0011] At the same time, the real-time monitoring data is also used to build a real-time data set. t , D t , V t , T t}, forming a real-time integrated signal S com，t , standardize the real-time integrated signal and convert the guide vane travel data into a 4mA to 20mA analog signal S nor，t ;

[0012] The historical state data is dynamically fitted to obtain the fitting signal for feedback.

[0013] As a preferred solution of the improved turbine guide vane position measurement method described in the present invention, the simulation signal also includes, after obtaining the preliminary fitting signal, measuring the current signal S com，t With the fitting signal Sfitted The error of (t) is E = S com，t -S fitted (t) Feedback is performed, and the output of the fitting signal is dynamically adjusted according to the error to form a correction: S adjusted (t) = S fitted (t)+k·E, where S adjusted (t) is the corrected fitting signal, k is the control gain for adjusting the intensity of the feedback error, and the final simulation signal is output;

[0014] The analog signal is connected to the AI ​​module through a shielded secondary cable and converted into a high-precision digital signal S through A / D. ds .

[0015] As a preferred solution of the improved turbine guide vane position measurement method described in the present invention, the optimization process includes converting the high-precision digital signal S ds The data bus is sent to the CPU optimization signal for optimization processing, and the digital signal is smoothed through dynamic impedance filtering to generate a smooth signal;

[0016] Calculate the guide vane velocity and acceleration after signal smoothing, and adjust the threshold of the control signal output considering the environmental data of the guide vane position:

[0017] θ open =θ open +β1·(a[n]+W[n])-(R[n]·β1)

[0018] θ close =θ close -β2·(a[n]+H[n])+(W[n]·β2)

[0019] Among them, θ open To define the guide vane opening threshold, the condition that determines when to open the guide vane; θ close To define the guide vane closing threshold, which determines the condition for closing the guide vane; β1 and β2 are adjustment coefficients that affect the opening and closing adjustment ranges, R[n] is the turbine speed, and W[n] represents the water flow velocity around the guide vane.

[0020] As a preferred solution of the improved turbine guide vane position measurement method described in the present invention, the control signal includes transmitting the optimized data to the digital output module through the data bus to generate the control signal including the guide vane fully closed signal, the guide vane no-load signal, and the guide vane fully open signal, and inputting it into the computer monitoring system and the butterfly valve control system;

[0021] When the smoothed signal exceeds the guide vane opening threshold + the water flow velocity around the guide vane × the correction coefficient, the control signal of the guide vane full opening signal is output;

[0022] When the smoothed signal does not exceed the value of the guide vane closing threshold minus the water level data around the guide vane position × the correction coefficient, a control signal of the guide vane full closing signal is output;

[0023] When the smooth signal is less than the guide vane closing threshold + the water flow velocity around the guide vane position × the correction coefficient and greater than the guide vane opening threshold - the turbine speed × the correction coefficient, the guide vane no-load signal is output;

[0024] The theoretical expected position of the control signal output is deduced based on the calculated guide vane velocity and acceleration values.

[0025] As a preferred solution of the improved turbine guide vane position measurement method described in the present invention, the measurement of the turbine guide vane position includes: when the system sends a control signal, the guide vane moves according to the control signal, and at the same time, the guide vane position is monitored in real time through a passive pull-rope displacement sensor. The output signal of the sensor should also be synchronized with the control signal, and the actual measurement position monitored in real time is judged against the theoretical expected position output by the control signal to determine whether the guide vane has moved to the expected position. When the absolute value of the difference between the actual position and the theoretical expected position is less than 0.1, it is considered that the guide vane is located at the theoretical expected position. Otherwise, it is considered that the guide vane needs to continue to be adjusted to the theoretical expected position.

[0026] Another object of the present invention is to provide an improved turbine guide vane position measurement method system, which aims to solve the technical problems of low accuracy, complex signal conversion and processing, poor environmental adaptability, difficult dynamic feedback adjustment, insufficient control signal optimization, safety stability and real-time monitoring automatic adjustment in traditional measurement methods. By installing a passive pull-rope displacement sensor on the main relay of the turbine, the guide vane operation data is accurately converted into an analog signal, and then converted into a digital signal through the analog input AI module and optimized. The system can monitor and accurately control the guide vane position in real time, improve measurement accuracy and system stability, and ensure safe and efficient operation of the turbine in different environments through automatic adjustment of the computer monitoring system and the butterfly valve control system.

[0027] As a preferred solution of the improved turbine guide vane position measurement system described in the present invention, it is characterized by comprising a passive pull-rope displacement sensor module, an analog input AI module, a data processing module, and a digital output DO module;

[0028] The passive pull-rope displacement sensor module is installed on the main servomotor of the turbine to monitor the operation data and environmental data of the guide vanes in real time, and convert the monitored data into analog signals and transmit them to the analog input AI module;

[0029] The AI ​​module performs A / D conversion on the analog signal output by the passive pull-wire displacement sensor and outputs a high-precision digital signal to the data processing module;

[0030] The data processing module optimizes the digital signal output by the AI ​​module and transmits the processed data to the digital output DO module;

[0031] The digital output DO module generates a control signal based on the data optimized by the CPU module and transmits it to the computer monitoring system and the butterfly valve control system, drives the guide vane to move and monitors the guide vane position in real time through a passive pull-wire displacement sensor, determines the deviation between the actual position and the theoretical expected position, and adjusts the guide vane to the expected position.

[0032] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, the steps of the improved method for measuring the position of a guide vane of a water turbine are implemented.

[0033] A computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of an improved method for measuring the position of a water turbine guide vane are implemented.

[0034] Beneficial effects of the present invention: The present invention installs a passive pull-rope displacement sensor on the main relay of the turbine to convert the guide vane operation data into an analog signal and optimize it into a digital signal, and then uses dynamic impedance filtering and smoothing technology to calculate the speed and acceleration of the guide vane, and adjust the threshold of the control signal output according to the environmental data. This technical detail ensures the accurate conversion and optimization of the signal, and realizes the dynamic adjustment of the output of the fitting signal through feedback error, thereby achieving the beneficial technical effects of improving measurement accuracy, enhancing the environmental adaptability of the system, and improving control efficiency. Finally, by real-time monitoring and comparing with the theoretical expected position, the guide vane position is accurately controlled, which significantly improves the operating performance and energy conversion efficiency of the turbine, ensuring the high stability and safety of the system.

[0035] The present invention replaces the traditional method of measuring the position signal of the guide vane of the turbine and is used by equipment such as a computer monitoring system, which not only improves the accuracy of the measurement of the position signal of the guide vane of the turbine, but also reduces the labor intensity of maintenance personnel and improves the success rate of automatic startup. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0037] Figure 1 An overall flow chart of an improved method for measuring the position of guide vanes of a water turbine provided in one embodiment of the present invention.

[0038] Figure 2 A simplified technical principle diagram of an improved method for measuring the position of guide vanes of a water turbine provided in accordance with an embodiment of the present invention.

[0039] Figure 3 A schematic diagram of a module of an improved turbine guide vane position measurement system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0043] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0044] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Example 1, reference Figure 1-Figure 2 , which is the first embodiment of the present invention, provides an improved method for measuring the position of a guide vane of a water turbine, comprising:

[0047] S1: Install a passive pull-rope displacement sensor on the main servomotor of the turbine to monitor the guide vane operation data.

[0048] Specifically, a passive pull-rope guide vane displacement sensor is installed on the main servomotor of the turbine to obtain the guide vane operation data including the guide vane opening angle, guide vane displacement, vibration data of the guide vane and the supporting structure, and the temperature of the turbine and the guide vane;

[0049] Environmental data including water flow direction, eddy current data, water flow velocity, water level data, turbine speed, and water pressure data around the guide vanes are simultaneously monitored at the installation location of the passive pull-wire displacement sensor.

[0050] Configure other devices as follows:

[0051]

[0052]

[0053] Schneider PLC controller, guide vane displacement sensor and accessories use passive pull-wire displacement sensor as signal acquisition element to measure the position of turbine guide vanes, and are used in large and medium-sized hydropower stations.

[0054] S2: The guide vane operation data is converted into an analog signal through a pull-wire sensor.

[0055] Furthermore, if Figure 2 As shown in the figure, a guide vane status data set containing historical operation is established.h , D h , V h , T h} and assign their respective weight coefficients to form the historical comprehensive signal S com，h , for S com，h Standardize the guide vane travel data and convert it into an analog signal S of 4mA to 20mA nor，h :

[0056]

[0057] Among them, A h , D h 、V h , T h The data of opening angle, guide vane displacement, vibration of guide vanes and supporting structures, and temperature of turbine and guide vanes during historical operation;

[0058] At the same time, the real-time monitoring data is also used to build a real-time data set. t , D t , V t , T t}, forming a real-time integrated signal S com，t , for S com，t Standardize the guide vane travel data and convert it into an analog signal S of 4mA to 20mA nor，t ;

[0059] Dynamically fitting the historical state data yields:

[0060]

[0061] Among them, S fitted (t) is the fitting signal generated according to the feature map, G(S com，h (t′)) is the result of nonlinear transformation of historical data at current time t′, and σ is the standard deviation of Gaussian distribution.

[0062] After obtaining the preliminary fitting signal, by measuring the current signal S com，t With the fitting signal S fitted The error of (t) is E = S com，t -S fitted (t) Feedback is performed, and the output of the fitting signal is dynamically adjusted according to the error to form a correction: S adjusted (t) = S fitted (t)+k·E, where S adjusted (t) is the corrected fitting signal, k is the control gain for adjusting the intensity of the feedback error, and the final signal output is:

[0063]

[0064] Among them, S final is the final output analog signal;

[0065] The analog signal is connected to the AI ​​module through a shielded secondary cable and converted into a high-precision digital signal S through A / D. ds .

[0066] S3: The collected analog signal is converted into a digital signal through the analog input AI module and optimized.

[0067] Furthermore, the high-precision digital signal S ds The data bus is sent to the CPU optimization signal for optimization processing, and the digital signal is smoothed through dynamic impedance filtering to generate a smooth signal:

[0068] S smooth [n] = S ds [n]·α+S smooth [n-1]·(1-α)

[0069] Among them, S d s represents the digital signal at the nth instant, S smooth [n] represents the smoothed signal, α is the dynamic smoothing coefficient that controls the weight of the current signal and the previous smoothed signal. The value range of α is 0.2-0.5, which balances the fast response and smoothing effect. Especially in an environment where the guide vane position changes frequently but not too drastically, it can better capture dynamic changes and suppress some noise.

[0070] Calculate the guide vane velocity V[n] and acceleration a[n] after signal smoothing:

[0071] V[n]=S smooth [n]-S smooth [n-1]+ω·W[n-1]

[0072]

[0073] Where W[n-1] represents the velocity of the water flow around the guide vane position at the n-1th instant, ω and It is the adjustment factor reflecting the influence of water flow and water level changes on the guide vane response, and H[n] represents the water level data around the guide vane position;

[0074] Considering the environmental data of the guide vane position, the threshold of the control signal output is adjusted:

[0075] θ open =θ open +β1·(a[n]+W[n])-(R[n]·β1)

[0076] θclose =θ close -β2·(a[n]+H[n])+(W[n]·β2)

[0077] Among them, θ open The guide vane opening threshold determines when to open the guide vane; θ close is the guide vane closing threshold, which determines when to close the guide vane; β1 and β2 are adjustment coefficients that affect the opening and closing adjustment ranges, R[n] is the turbine speed, and W[n] represents the water flow velocity around the guide vane.

[0078] It should be noted that the optimized data is transmitted to the digital output module through the data bus to generate control signals including the guide vane fully closed signal, the guide vane no-load signal, and the guide vane fully open signal, and is input into the computer monitoring system and the butterfly valve control system;

[0079] When the smoothed signal exceeds the guide vane opening threshold + the water flow velocity around the guide vane × the correction coefficient, the control signal of the guide vane full opening signal is output;

[0080] When the smoothed signal does not exceed the value of the guide vane closing threshold minus the water level data around the guide vane position × the correction coefficient, a control signal of the guide vane full closing signal is output;

[0081] When the smooth signal is less than the guide vane closing threshold + the water flow velocity around the guide vane position × the correction coefficient and greater than the guide vane opening threshold - the turbine speed × the correction coefficient, the guide vane no-load signal is output;

[0082] The theoretical expected position of the control signal output is deduced based on the calculated guide vane velocity and acceleration values.

[0083] S4: The optimized data is transmitted to the digital output DO module through the data bus to generate a control signal and measure the position of the turbine guide vane.

[0084] Furthermore, when the system sends a control signal, the guide vane moves according to the control signal, and at the same time, the guide vane position is monitored in real time through a passive pull-rope displacement sensor. The output signal of the sensor should also be synchronized with the control signal. The actual measured position monitored in real time and the theoretical expected position output by the control signal are judged to determine whether the guide vane has moved to the expected position. When the absolute value of the difference between the actual position and the theoretical expected position is less than 0.1, it is considered that the guide vane is at the theoretical expected position. Otherwise, it is considered that the guide vane needs to continue to be adjusted to the theoretical expected position.

[0085] Embodiment 2, the second embodiment of the present invention, is different from the first two embodiments in that:

[0086] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

[0087] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0088] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0089] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0090] Example 3, reference Figure 3 , which is the third embodiment of the present invention, and provides an improved turbine guide vane position measurement system, including a passive pull-wire displacement sensor module 10, an analog input AI module 20, a data processing module 30, and a digital output DO module 40;

[0091] The passive pull-rope displacement sensor module 10 is installed on the main servomotor of the turbine to monitor the operation data and environmental data of the guide vanes in real time, and convert the monitored data into analog signals and transmit them to the analog input AI module 20;

[0092] The AI ​​module 20 performs A / D conversion on the analog signal output by the passive pull-wire displacement sensor and outputs a high-precision digital signal to the data processing module 30;

[0093] The data processing module 30 optimizes the digital signal output by the AI ​​module and transmits the processed data to the digital output DO module 40;

[0094] The digital output DO module 40 generates a control signal based on the data optimized by the CPU module and transmits it to the computer monitoring system and the butterfly valve control system, drives the guide vane to move and monitors the guide vane position in real time through a passive pull-wire displacement sensor, determines the deviation between the actual position and the theoretical expected position, and adjusts the guide vane to the expected position.

[0095] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An improved method for measuring the position of a water turbine guide vane, characterized in that: include, Install a passive pull-rope displacement sensor on the main servomotor of the turbine to monitor the guide vane operation data; The guide vane operation data is converted into analog signals through the pull-wire sensor; The collected analog signals are converted into digital signals through the analog input AI module and optimized; The optimized data is transmitted to the digital output DO module through the data bus to generate a control signal and measure the position of the turbine guide vane.

2. An improved method for measuring the position of guide vanes of a water turbine according to claim 1, characterized in that: The operation data includes installing a passive rope-type guide vane displacement sensor on the main servomotor of the turbine to obtain the guide vane operation data including the guide vane opening angle, guide vane displacement, vibration data of the guide vane and the supporting structure, and the temperature of the turbine and the guide vane; Environmental data including water flow direction, eddy current data, water flow velocity, water level data, turbine speed, and water pressure data around the guide vanes are simultaneously monitored at the installation location of the passive pull-wire displacement sensor.

3. An improved method for measuring the position of guide vanes of a water turbine as claimed in claim 2, characterized in that: The simulation signal includes establishing a guide vane status data set containing historical operation h ,D h ,V h ,T h And assign their respective weight coefficients to form the historical comprehensive signal S com,h , for S com,h Standardize the guide vane travel data and convert it into an analog signal S of 4mA to 20mA nor,h ; At the same time, the real-time monitoring data is also used to build a real-time data set. t ,D t ,V t ,T t }, forming a real-time integrated signal S com,t , standardize the real-time integrated signal and convert the guide vane travel data into a 4mA to 20mA analog signal S nor,t ; The historical state data is dynamically fitted to obtain the fitting signal for feedback.

4. An improved method for measuring the position of guide vanes of a water turbine as claimed in claim 3, characterized in that: The simulation signal also includes, after obtaining the preliminary fitting signal, measuring the current signal S com,t With the fitting signal S fitted ( t ) The error E = S com,t -S fitted ( t ) Feedback is performed, and the output of the fitting signal is dynamically adjusted according to the error to form a correction: S adjusted ( t ) =S fitted ( t ) + k·E, where S adjusted ( t ) is the corrected fitting signal, k is the control gain for adjusting the intensity of the feedback error, and the final simulation signal is output; The analog signal is connected to the AI ​​module through a shielded secondary cable and converted into a high-precision digital signal S through A / D. ds .

5. An improved method for measuring the position of guide vanes of a water turbine as claimed in claim 4, characterized in that: The optimization process includes converting the high-precision digital signal S ds The data bus is sent to the CPU optimization signal for optimization processing, and the digital signal is smoothed through dynamic impedance filtering to generate a smooth signal; Calculate the guide vane velocity and acceleration after signal smoothing, and adjust the threshold of the control signal output considering the environmental data of the guide vane position: i open =θ open +β1·(a[n]+W[n])-(R[n]·β1) θ close =θ close -β2 (a[n]+H[n])+(W[n] β2) Among them, θ open To define the guide vane opening threshold, the condition that determines when to open the guide vane; θ close To define the guide vane closing threshold, which determines the condition for closing the guide vane; β1 and β2 are adjustment coefficients that affect the opening and closing adjustment ranges, R[n] is the turbine speed, and W[n] represents the water flow velocity around the guide vane.

6. An improved method for measuring the position of guide vanes of a water turbine as claimed in claim 5, characterized in that: The control signal includes transmitting the optimized data to the digital output module through the data bus to generate control signals including a guide vane fully closed signal, a guide vane no-load signal, and a guide vane fully open signal, and inputting them into the computer monitoring system and the butterfly valve control system; When the smoothed signal exceeds the guide vane opening threshold + the water flow velocity around the guide vane × the correction coefficient, the control signal of the guide vane full opening signal is output; When the smoothed signal does not exceed the value of the guide vane closing threshold minus the water level data around the guide vane position × the correction coefficient, a control signal of the guide vane full closing signal is output; When the smooth signal is less than the guide vane closing threshold + the water flow velocity around the guide vane position × the correction coefficient and greater than the guide vane opening threshold - the turbine speed × the correction coefficient, the guide vane no-load signal is output; The theoretical expected position of the control signal output is deduced based on the calculated guide vane velocity and acceleration values.

7. An improved method for measuring the position of guide vanes of a water turbine as claimed in claim 6, characterized in that: The measuring of the position of the turbine guide vane includes: when the system sends a control signal, the guide vane moves according to the control signal, and at the same time, the guide vane position is monitored in real time through a passive pull-rope displacement sensor. The output signal of the sensor should also be synchronized with the control signal. The actual measurement position monitored in real time and the theoretical expected position output by the control signal are judged to determine whether the guide vane has moved to the expected position. When the absolute value of the difference between the actual position and the theoretical expected position is less than 0.1, it is considered that the guide vane is located at the theoretical expected position. Otherwise, it is considered that the guide vane needs to continue to be adjusted to the theoretical expected position.

8. A system using the improved method for measuring the position of guide vanes of a water turbine as claimed in any one of claims 1 to 7, characterized in that: It includes passive pull-rope displacement sensor module, analog input AI module, data processing module and digital output DO module; The passive pull-rope displacement sensor module is installed on the main servomotor of the turbine to monitor the operation data and environmental data of the guide vanes in real time, and convert the monitored data into analog signals and transmit them to the analog input AI module; The AI ​​module performs A / D conversion on the analog signal output by the passive pull-wire displacement sensor and outputs a high-precision digital signal to the data processing module; The data processing module optimizes the digital signal output by the AI ​​module and transmits the processed data to the digital output DO module; The digital output DO module generates a control signal based on the data optimized by the CPU module and transmits it to the computer monitoring system and the butterfly valve control system, drives the guide vane to move and monitors the guide vane position in real time through a passive pull-wire displacement sensor, determines the deviation between the actual position and the theoretical expected position, and adjusts the guide vane to the expected position.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of an improved method for measuring the position of a water turbine guide vane according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of an improved method for measuring the position of a water turbine guide vane according to any one of claims 1 to 7 are implemented.

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