Method and system for actively diagnosing health degree of cylindrical valve and proportional valve of water turbine

Abstract

The invention discloses an active diagnosis method and system for the health degree of a proportional valve of a cylindrical valve of a water turbine. The method comprises the steps that S1, the state of a target cylindrical valve is monitored and obtained; s2, according to the current state of the target cylindrical valve, obtaining a corresponding active test instruction group, and sending active test instructions one by one; s3, obtaining and recording the valve core position of the corresponding proportional valve after each active test instruction is executed; s4, constructing an instruction position feedback relation table, performing early warning and alarm judgment based on the instruction position feedback relation table according to the valve core position of the proportional valve corresponding to the active test instruction, and recording judgment results respectively; and S5, performing comprehensive diagnosis according to a judgment result, and outputting a diagnosis result. The health degree of the proportional valve is actively diagnosed, the probability of jamming in the actual opening or closing process of the cylindrical valve is effectively avoided, comprehensive data support is provided for state maintenance of equipment, and safe and stable operation of the equipment is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of technology, and in particular to a method and system for active diagnosis of the health status of a proportional valve in a water turbine cylindrical valve. Background Technology

[0002] Hydroelectric turbine cylindrical valves often employ a synchronous hydraulic motor + proportional valve synchronization method. The synchronous hydraulic motor achieves even flow distribution among multiple servo valves, while the proportional valve achieves higher precision synchronization. In other words, the synchronous hydraulic motor provides coarse adjustment, and the proportional valve provides fine adjustment, working together to achieve synchronous control of the servo valves. The synchronization accuracy of the servo valves during opening and closing is the most crucial parameter determining the normal operation of the cylindrical valve. For a cylindrical valve system with a synchronous hydraulic motor + proportional valve structure, the reliability of the proportional valve is fundamental to achieving high-precision synchronization of the cylindrical valve.

[0003] In the hydropower industry, the health diagnosis of proportional valves is primarily conducted offline. This involves removing the proportional valve and installing it on a dedicated platform for testing, suitable for pre-production testing of new products and post-fault performance testing. Without online proactive diagnosis, fault diagnosis can only be made manually when the proportional valve's health deteriorates to the point of jamming. This necessitates emergency shutdowns, and in severe cases, may prevent the unit from starting up and connecting to the grid as planned, impacting the safe and stable operation of the power grid. Therefore, online proactive diagnosis of proportional valve health has significant engineering application value. However, existing diagnostic methods cannot monitor the health of proportional valves in real time when they are not in operation. Summary of the Invention

[0004] To address the above problems, this invention provides an active health diagnosis method for the proportional valve of a turbine cylindrical valve, the specific technical solution of which is as follows: S1: Monitor and acquire the status of the target cylindrical valve; S2: Based on the current state of the target cylindrical valve, obtain the corresponding active test command group and issue active test commands one by one; S3: Obtain and record the valve core position of the corresponding proportional valve after each active test command is executed; S4: Construct a command position feedback relationship table. Based on the valve core position of the proportional valve corresponding to the active test command, make early warning and alarm judgments based on the command position feedback relationship table, and record the judgment results respectively. S5: Perform a comprehensive diagnosis based on the judgment results and output the diagnosis results.

[0005] Furthermore, in step S2, the active test command group includes an open active test command group and a close active test command group, which correspond to the fully open state and the fully closed state of the target cylindrical valve, respectively.

[0006] Furthermore, the active test instruction group for opening direction includes several active test instructions for the opening degree of the control valve based on the opening degree step setting; The active test command group includes several active test commands for the control valve closing degree based on the closing degree step setting.

[0007] Furthermore, in step S4, the command position feedback relationship table is obtained by fitting the relationship between the proportional valve active test command and the valve core position using the proportional valve design manual and new proportional valve test data. The instruction position feedback relationship table also includes preset warning parameters and blocking parameters for the corresponding active test instructions.

[0008] Furthermore, in step S4, the specific process for determining the early warning and alarm is as follows: According to the active test command, the expected position of the valve core is obtained from the command position feedback relationship table, and the difference between the valve core position and the valve core position of the proportional valve corresponding to the command is calculated to obtain the position deviation. The position deviation is compared with the warning parameters and jamming parameters corresponding to the instruction.

[0009] Furthermore, in step S4, the record judgment result is to record the number of times the position deviation is greater than the warning parameter and the blocking parameter, respectively, and record them as the number of warnings and the number of alarms.

[0010] Furthermore, in step S5, the comprehensive diagnosis is as follows:

[0011] Where i and k represent the number of warnings and the number of alarms, respectively; i_set_1, i_set_2 and i_set_3 represent the first threshold, the second threshold and the third threshold, respectively; The first threshold, the second threshold, and the third threshold increase sequentially.

[0012] The present invention also provides an active health diagnosis system for the proportional valve of a turbine cylindrical valve. Based on the above-described active health diagnosis method for the proportional valve of a turbine cylindrical valve, the system includes a status monitoring module, an active testing module, a testing and judgment module, and a health diagnosis module. The status monitoring module is used to monitor and acquire the status of the target cylindrical valve, and when it detects that the cylindrical valve is in a fully open or fully closed state, it sends a request test signal to the active test module. The active testing module is equipped with the active testing instruction group. Based on the received request signal and the current state of the target cylindrical valve, it sequentially sends the active testing instructions in the corresponding active testing instruction group. The judgment and testing module obtains the valve core position corresponding to each active test command, calls the valve core expected position data in the command position feedback relationship table, performs difference calculation, and compares the difference calculation result with the warning parameter and jamming parameter in the command position feedback relationship table, and records the comparison result; The health diagnosis module sets a threshold parameter, receives the comparison result from the judgment test module, compares it with the set threshold parameter, and outputs the health diagnosis result.

[0013] Furthermore, the system also includes an information interaction module that is connected to the status monitoring module, the active testing module, the test judgment module, and the health diagnosis module, respectively. The information interaction module is also connected to a control terminal.

[0014] The beneficial effects of this invention are as follows: 1. This invention utilizes the characteristic that the proportional valve is in a neutral or slightly open state when the cylindrical valve is fully open, or in a neutral or slightly closed state when the cylindrical valve is fully closed, to actively issue test commands without affecting the normal power generation and standby of the hydroelectric generator set. Based on the feedback of the valve core position of the proportional valve, the health of the proportional valve is actively diagnosed, effectively avoiding the probability of jamming during the actual opening or closing process of the cylindrical valve.

[0015] 2. This invention sets early warning and alarm parameters, obtains the valve core position by executing active test commands, calculates the difference between the valve core position and the expected valve core position, and compares and judges the difference with the early warning and alarm parameters respectively. This enables early warning of abnormal conditions of proportional valves and judgment of faults in non-regulation processes. At the same time, it also performs comprehensive diagnosis by statistically analyzing the number of early warnings and alarms to obtain the health status of proportional valves. This provides comprehensive data support for equipment condition maintenance and ensures the safe and stable operation of the equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the execution flow of the method of the present invention. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention are clearly and completely described in the following description. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use, or the orientation or positional relationship in which those skilled in the art conventionally understand it during use. This is only for the convenience of describing the present invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0019] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0020] Example 1 Embodiment 1 of the present invention discloses an active health diagnosis method for the proportional valve of a turbine cylindrical valve, such as... Figure 1 As shown, the details are as follows: S1: Monitor and acquire the status of the target cylindrical valve; Specifically, the cylindrical valve has the following states: opening process, closing process, stop state, fully open state and fully closed state, with only one state at a time; when the cylindrical valve is fully open, the proportional valve is in the neutral or slightly open state, and when the cylindrical valve is fully closed, the proportional valve is in the neutral or slightly closed state. In this embodiment, the test is performed in both the fully open and fully closed states.

[0021] S2: Based on the current state of the target cylindrical valve, obtain the corresponding active test command group and issue active test commands one by one; In this embodiment, the active test command group includes an open active test command group and a close active test command group, which correspond to the fully open state and the fully closed state of the target cylindrical valve, respectively.

[0022] The active test command group for opening direction includes several active test commands for the opening degree of the control valve based on the opening degree step setting; The active test command group includes several active test commands for the control valve closing degree based on the closing degree step setting.

[0023] Specifically, the step size between instructions in the active test instruction group is set according to the actual situation, and no specific limit is made here; The range of active test commands in the active test command group is 0-100%; The range of active test instructions in the active test instruction group is -100% to 0.

[0024] S3: Obtain and record the valve core position of the corresponding proportional valve after each active test command is executed; S4: Construct a command position feedback relationship table. Based on the valve core position of the proportional valve corresponding to the active test command, make early warning and alarm judgments based on the command position feedback relationship table, and record the judgment results respectively.

[0025] Specifically, the command position feedback relationship table is obtained by fitting the relationship between the active test command of the proportional valve and the valve core position using the proportional valve design manual and new proportional valve test data.

[0026] In a preferred embodiment, the instruction position feedback relationship table also includes preset warning parameters and blocking parameters corresponding to the active test instruction. The specific values ​​of the warning parameters and blocking parameters are set according to the actual situation and are not specifically limited here.

[0027] In a preferred embodiment, the warning and alarm judgment process is as follows: According to the active test command, the expected position of the valve core is obtained from the command position feedback relationship table, and the difference between the valve core position and the valve core position of the proportional valve corresponding to the command is calculated to obtain the position deviation. The position deviation is compared with the warning parameter and the jamming parameter corresponding to the instruction, respectively; Specifically, after each active test command is executed and the test is completed, the proportional valve control command returns to the state before the test, and then the next active test command is executed.

[0028] In a preferred embodiment, the recording and judgment results are obtained by recording the number of times the position deviation is greater than the warning parameter and the blocking parameter, respectively, which are recorded as the number of warnings and the number of alarms; If the active test command cannot be matched with the table, the corresponding valve core expected position, warning parameters and alarm parameters can be obtained by interpolation calculation, and then the difference calculation, comparison judgment and judgment result are recorded.

[0029] Specifically, during the testing and judgment process, if the deviation between the final action position of the current command valve core and the expected action position meets the warning threshold requirement, an warning will be issued to remind maintenance personnel to confirm on-site; if the deviation between the final action position of the current command valve core and the expected action position meets the jamming threshold requirement, a jamming fault will be reported to remind maintenance personnel to handle it.

[0030] S5: After completing the testing of all instructions, perform a comprehensive diagnosis based on the judgment results and output the diagnosis results.

[0031] In this embodiment, the comprehensive diagnosis is as follows:

[0032] Where i and k represent the number of warnings and the number of alarms, respectively; i_set_1, i_set_2 and i_set_3 represent the first threshold, the second threshold and the third threshold, respectively; The first threshold, the second threshold, and the third threshold increase sequentially.

[0033] Example 2 Embodiment 2 of the present invention discloses an active health diagnosis system for a proportional valve of a turbine cylindrical valve based on Embodiment 1 above. The system includes a status monitoring module, an active testing module, a testing and judgment module, and a health diagnosis module. The status monitoring module is used to monitor and acquire the status of the target cylindrical valve, and when it detects that the cylindrical valve is in a fully open or fully closed state, it sends a request test signal to the active test module. The active testing module is equipped with the active testing instruction group. Based on the received request signal and the current state of the target cylindrical valve, it sequentially sends the active testing instructions in the corresponding active testing instruction group. The judgment and testing module obtains the valve core position corresponding to each active test command, calls the valve core expected position data in the command position feedback relationship table, performs difference calculation, and compares the difference calculation result with the warning parameter and jamming parameter in the command position feedback relationship table, and records the comparison result; The health diagnosis module sets a threshold parameter, receives the comparison result from the judgment test module, compares it with the set threshold parameter, and outputs the health diagnosis result.

[0034] In a preferred embodiment, the system further includes an information interaction module connected to the status monitoring module, the active testing module, the test judgment module, and the health diagnosis module, respectively. The information interaction module is also connected to a control terminal. The system outputs and displays the results of each measurement on the human-machine interface of the control terminal, including the measurement command, the proportional valve action position, the attention status, and the warning and alarm status. Specifically, based on the data interaction module, the active test commands and the judgment thresholds for each step can be debugged and modified through the operation of the human-computer interaction interface.

[0035] The control terminal can also transmit signals to the hydropower station's computer monitoring system and other status monitoring systems for equipment operation and maintenance information prompts.

[0036] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A method for actively diagnosing the health status of a proportional valve in a turbine cylindrical valve, characterized in that, include: S1: Monitor and acquire the status of the target cylindrical valve; S2: Based on the current state of the target cylindrical valve, obtain the corresponding active test command group and issue active test commands one by one; S3: Obtain and record the valve core position of the corresponding proportional valve after each active test command is executed; S4: Construct a command position feedback relationship table. Based on the valve core position of the proportional valve corresponding to the active test command, make early warning and alarm judgments based on the command position feedback relationship table, and record the judgment results respectively. S5: Perform a comprehensive diagnosis based on the judgment results and output the diagnosis results.

2. The active health diagnosis method for the proportional valve of a turbine cylindrical valve according to claim 1, characterized in that, In step S2, the active test command group includes an open active test command group and a close active test command group, which correspond to the fully open state and the fully closed state of the target cylindrical valve, respectively.

3. The active health diagnosis method for the proportional valve of a turbine cylindrical valve according to claim 2, characterized in that, The active test command group for opening direction includes several active test commands for the opening degree of the control valve based on the opening degree step setting; The active test command group includes several active test commands for the control valve closing degree based on the closing degree step setting.

4. The active health diagnosis method for the proportional valve of a turbine cylindrical valve according to claim 1, characterized in that, In step S4, the command position feedback relationship table is obtained by fitting the relationship between the active test command of the proportional valve and the valve core position using the proportional valve design manual and the new proportional valve test data. The instruction position feedback relationship table also includes preset warning parameters and blocking parameters for the corresponding active test instructions.

5. The active health diagnosis method for the proportional valve of a turbine cylindrical valve according to claim 4, characterized in that, In step S4, the specific process for determining the early warning and alarm is as follows: According to the active test command, the expected position of the valve core is obtained from the command position feedback relationship table, and the difference between the valve core position and the valve core position of the proportional valve corresponding to the command is calculated to obtain the position deviation. The position deviation is compared with the warning parameters and jamming parameters corresponding to the instruction.

6. The active health diagnosis method for the proportional valve of a turbine cylindrical valve according to claim 5, characterized in that, In step S4, the record judgment result is to record the number of times the position deviation is greater than the warning parameter and the blocking parameter, respectively, and record them as the number of warnings and the number of alarms.

7. The active health diagnosis method for the proportional valve of a turbine cylindrical valve according to claim 6, characterized in that, In step S5, the comprehensive diagnosis is as follows: Where i and k represent the number of warnings and the number of alarms, respectively; i_set_1, i_set_2 and i_set_3 represent the first threshold, the second threshold and the third threshold, respectively; The first threshold, the second threshold, and the third threshold increase sequentially.

8. A health-active diagnostic system for the proportional valve of a turbine cylindrical valve, characterized in that, Based on the active health diagnosis method for the proportional valve of the turbine cylindrical valve according to any one of claims 1-7, the system includes a status monitoring module, an active testing module, a testing judgment module, and a health diagnosis module; The status monitoring module is used to monitor and acquire the status of the target cylindrical valve, and when it detects that the cylindrical valve is in a fully open or fully closed state, it sends a request test signal to the active test module. The active testing module is equipped with the active testing instruction group. Based on the received request signal and the current state of the target cylindrical valve, it sequentially sends the active testing instructions in the corresponding active testing instruction group. The judgment and testing module obtains the valve core position corresponding to each active test command, calls the valve core expected position data in the command position feedback relationship table, performs difference calculation, and compares the difference calculation result with the warning parameter and jamming parameter in the command position feedback relationship table, and records the comparison result; The health diagnosis module sets a threshold parameter, receives the comparison result from the judgment test module, compares it with the set threshold parameter, and outputs the health diagnosis result.

9. The active health diagnosis system for the proportional valve of a turbine cylindrical valve according to claim 8, characterized in that, The system also includes an information interaction module that is connected to the status monitoring module, the active testing module, the test judgment module, and the health diagnosis module, respectively. The information interaction module is also connected to a control terminal.

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