A main pressure regulating valve start-stop limit abnormality monitoring method and device and electronic equipment

Abstract

Embodiments of the present application provide a main pressure regulating valve start-stop limit abnormality monitoring method and device and electronic equipment, relating to the technical field of abnormality monitoring of a main pressure regulating valve of a hydroelectric generating set speed regulation system, the method comprising: based on a local main state, an automatic guide vane mode and a speed regulation system stop standby state, starting monitoring preparation or stop monitoring preparation; after the starting monitoring preparation is completed, starting limit monitoring is performed based on the number of starts; after the stop monitoring preparation is completed, stop limit monitoring is performed based on the number of stops. The technical solution of the present application can help hydroelectric station staff to promptly find signs of loosening of the main pressure regulating valve start-stop limit nut, and avoid the occurrence of serious faults such as start-stop failure, overspeed and main connection following faults caused by further loosening of the start-stop limit nut.

Description

Technical Field

[0001] This application relates to the field of abnormal monitoring technology of main pressure regulating valve in hydropower unit speed control system. Specifically, it relates to a method for abnormal monitoring of main pressure regulating valve start-stop limit, a device for abnormal monitoring of main pressure regulating valve start-stop limit, and an electronic device. Background Technology

[0002] Currently, the start-up and shutdown speeds of the main and auxiliary power generation units in the hydropower unit speed control system are adjusted by the limit nut of the main and auxiliary power generation valve core. If the limit nut of the main and auxiliary power generation valve core becomes loose, it will cause changes in the start-up and shutdown action range of the main and auxiliary power generation units, resulting in changes in the switching speed of the turbine guide vanes. Consequently, the speed governor cannot adjust the guide vanes according to the predetermined pattern.

[0003] If the start-up limit nut of the main valve core is loosened in the direction of increasing start-up limit, the guide vane may open too quickly when the speed control system starts up, which may lead to an overspeed accident. If the start-up limit nut of the main valve core is loosened in the direction of decreasing start-up limit, the guide vane may open too slowly when the speed control system starts up, which may lead to a main servo follow-up failure, or even start-up failure.

[0004] If the stop limit nut of the main valve core loosens in the direction of increasing the stop limit, the guide vane may open too quickly when the speed control system stops, failing to meet the adjustment and protection calculation requirements. This could cause the water pressure steel pipe to suffer water hammer impacts exceeding the design range, and even potentially lead to the rupture of the pressure steel pipe. Conversely, if the stop limit nut of the main valve core loosens in the direction of decreasing the stop limit, the guide vane may close too slowly when the speed control system stops. This could lead to a follow-up failure of the main servo motor, preventing the guide vane from closing in time when the speed control system needs to return to its original position, thus causing an overspeed accident.

[0005] Therefore, there is an urgent need to develop a method to monitor abnormal conditions of the main pressure regulating valve. Summary of the Invention

[0006] The embodiments of this application provide a method for monitoring abnormal start-stop limit of a main pressure regulating valve, a device for monitoring abnormal start-stop limit of a main pressure regulating valve, and an electronic device, which can monitor the start-stop limit of the main pressure regulating valve in the hydropower unit speed regulation system, generate an alarm when an abnormality occurs in the start-stop limit of the main pressure regulating valve, and remind hydropower station staff to check and handle it in a timely manner.

[0007] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0008] According to a first aspect of the embodiments of this application, a method for monitoring abnormal start-up and shutdown limit switches of a main pressure regulating valve is provided, wherein the main pressure regulating valve is applied to a hydropower unit speed control system, comprising:

[0009] Based on the main operating status of the machine, the automatic guide vane mode, and the standby status of the speed control system, prepare for startup monitoring or shutdown monitoring.

[0010] After the power-on monitoring preparation is completed, power-on limit monitoring is performed based on the number of power-on attempts.

[0011] After the shutdown monitoring preparation is completed, shutdown limit monitoring is performed based on the number of shutdowns.

[0012] In some embodiments of this application, based on the foregoing scheme, the step of performing start-up monitoring preparation or shutdown monitoring preparation based on the machine's main operating state, guide vane automatic mode, and speed control system shutdown standby state includes:

[0013] When the machine is in main operation mode, the guide vane is in automatic mode, and the speed control system is in standby mode, start-up monitoring preparation is performed.

[0014] When the machine is in main operation mode, the guide vanes are in automatic mode, and the speed control system is not in standby mode, shutdown monitoring preparation is performed.

[0015] In some embodiments of this application, based on the foregoing scheme, the step of performing startup monitoring preparation when the machine is in active mode, the guide vane is in automatic mode, and the speed control system is in standby mode includes:

[0016] Activate the delay timer for power-on process monitoring;

[0017] Determine whether the real-time value of the main and auxiliary positions is greater than the maximum value of the main and auxiliary positions during the power-on process;

[0018] If yes, update the maximum value of the main and auxiliary positions during the power-on process using the real-time value of the main and auxiliary positions. Otherwise, determine whether the timing of the delay timer used for monitoring the power-on process has reached the power-on monitoring duration. If the time has not been reached, continue to compare and determine whether the real-time value of the main and auxiliary positions is greater than the maximum value of the main and auxiliary positions during the power-on process. If the time has been reached, increase the number of power-on attempts by one and limit the number of power-on attempts to between 0 and the upper limit of the number of power-on attempts, and update the main and auxiliary power-on limit record array.

[0019] In some embodiments of this application, based on the foregoing scheme, the step of performing shutdown monitoring preparation when the machine is in active mode, the guide vane is in automatic mode, and the speed control system is not in standby mode includes:

[0020] Activate the delay timer for monitoring the shutdown process;

[0021] Determine whether the real-time value of the main and auxiliary positions is less than the minimum value of the main and auxiliary positions during the shutdown process;

[0022] If yes, update the minimum value of the main and auxiliary positions during the shutdown process using the real-time value of the main and auxiliary positions; otherwise, determine whether the timing of the delay timer used for monitoring the shutdown process has reached the shutdown monitoring duration; if the time has not been reached, continue to compare and determine whether the real-time value of the main and auxiliary positions is less than the minimum value of the main and auxiliary positions during the shutdown process; if the time has been reached, increase the shutdown count by one, limit the shutdown count to between 0 and the maximum shutdown count, and update the main and auxiliary shutdown limit record array.

[0023] In some embodiments of this application, based on the foregoing scheme, the step of performing power-on limit monitoring based on the number of power-on cycles after the power-on monitoring preparation is completed includes:

[0024] Determine if the number of power-on attempts exceeds the first power-on attempt threshold. If not, wait for the next main and auxiliary power-on limit record array. If so, compare the absolute value of the deviation between the current power-on limit record and the first power-on limit record to see if it exceeds the alarm value for excessive deviation between the current power-on limit record and the initial power-on record. If it does, generate a main and auxiliary power-on limit abnormality alarm.

[0025] In some embodiments of this application, based on the foregoing scheme, the step of performing power-on limit monitoring based on the number of power-on cycles after the power-on monitoring preparation is completed further includes:

[0026] Determine if the number of power-on attempts exceeds the second power-on attempt threshold. If so, calculate the difference between each pair of the most recent consecutive main and auxiliary power-on limit records. If the difference exceeds the abnormal deviation alarm value in the positive direction or exceeds the opposite number of the abnormal deviation alarm value in the negative direction, an abnormal alarm for the main and auxiliary power-on limit will be generated.

[0027] Among them, the first power-on count threshold is less than the second power-on count threshold.

[0028] In some embodiments of this application, based on the foregoing scheme, the step of performing shutdown limit monitoring based on the number of shutdowns after shutdown monitoring preparation is completed includes:

[0029] Determine if the number of shutdowns exceeds the first shutdown threshold. If not, wait for the next main and auxiliary shutdown limit record array. If so, compare the absolute value of the deviation between the current shutdown limit record and the first shutdown limit record to see if it exceeds the alarm value for excessive deviation between the current shutdown limit record and the initial shutdown record. If it does, generate a main and auxiliary shutdown limit abnormality alarm.

[0030] In some embodiments of this application, based on the foregoing scheme, the step of performing stop limit monitoring based on the number of stops after the stop monitoring preparation is completed further includes:

[0031] Determine if the number of shutdowns exceeds the second shutdown number threshold. If so, calculate the difference between each pair of the most recent consecutive main and auxiliary shutdown limit records. If the difference exceeds the abnormal deviation alarm value in the positive direction or exceeds the opposite number of the abnormal deviation alarm value in the negative direction, an abnormal alarm for the main and auxiliary shutdown limit will be generated.

[0032] Among them, the first downtime threshold is less than the second downtime threshold.

[0033] According to a second aspect of the embodiments of this application, a main pressure regulating valve start-stop limit abnormality monitoring device is provided, wherein the main pressure regulating valve is applied to a hydropower unit speed control system, comprising:

[0034] The power-on monitoring and preparation module is used to perform power-on monitoring and preparation based on the main operating status of the machine, the automatic guide vane mode, and the shutdown and standby status of the speed control system.

[0035] The shutdown monitoring and preparation module is used to perform shutdown monitoring and preparation based on the main operating status of the machine, the automatic guide vane mode, and the shutdown standby status of the speed control system.

[0036] The power-on limit monitoring module is used to perform power-on limit monitoring based on the number of power-on cycles after power-on monitoring preparation is completed;

[0037] The shutdown limit monitoring module is used to perform shutdown limit monitoring based on the number of shutdowns after shutdown monitoring preparation is completed.

[0038] According to a third aspect of the embodiments of this application, a computer-readable storage medium is provided, wherein computer instructions are stored therein, and when the computer instructions are executed on a computer, the computer causes the computer to perform the method described in the first aspect above.

[0039] According to a fourth aspect of the embodiments of this application, an electronic device is provided, including a memory and a processor;

[0040] The memory is used to store computer instructions;

[0041] The processor is configured to invoke computer instructions stored in the memory, causing the electronic device to execute the method described in the first aspect above.

[0042] The technical solution of this application can help hydropower station staff to detect signs of loosening of the start-stop limit nut of the main pressure distribution valve in a timely manner, and avoid serious faults such as start-stop failure, overspeed, and main connection follow-up failure caused by further loosening of the start-stop limit nut.

[0043] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0044] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0045] Figure 1 A flowchart illustrating an abnormal monitoring method for the start / stop limit of a main pressure regulating valve according to an embodiment of this application is shown.

[0046] Figure 2 A block diagram of a main pressure regulating valve start-stop limit abnormality monitoring device according to an embodiment of this application is shown;

[0047] Figure 3 A schematic diagram illustrating the implementation of power-on monitoring preparation using a module according to an embodiment of this application is shown;

[0048] Figure 4 A schematic diagram illustrating the implementation of power-on limit monitoring using a module according to an embodiment of this application is shown;

[0049] Figure 5 A schematic diagram illustrating the use of a module to implement shutdown monitoring preparation according to an embodiment of this application is shown;

[0050] Figure 6 A schematic diagram illustrating the use of a module to implement stop limit monitoring according to an embodiment of this application is shown;

[0051] Figure 7 A block diagram of an electronic device according to one embodiment of this application is shown;

[0052] Figure 8 A schematic diagram of the structure of a computer system suitable for implementing the electronic device of the present application is shown. Detailed Implementation

[0053] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0054] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0055] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0056] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0057] It should be noted that "multiple" in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0058] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described.

[0059] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0060] The following detailed description of some embodiments of this application will be provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0061] To achieve abnormal monitoring of the main pressure distribution valve in the hydropower unit speed control system, this technical solution proposes a method for monitoring abnormal start-up and shutdown limit switches of the main pressure distribution valve. This method utilizes the fact that during each start-up and shutdown process in automatic mode, the guide vanes of the hydropower unit speed control system undergo significant opening and closing operations. During this process, the valve core of the main pressure distribution valve inevitably moves against the start-up and shutdown limit switch nuts. The extreme values ​​of the valve core position during each start-up and shutdown process reflect the position of the main pressure distribution valve's start-up and shutdown limit switches. By continuously recording and comparing the positions of the main pressure distribution valve's start-up and shutdown limit switches multiple times, the method monitors the loosening range and trend of the main pressure distribution valve's start-up and shutdown limit switches. If the loosening range is too large or there is a significant loosening trend, an alarm for abnormal start-up and shutdown limit switches is generated, reminding hydropower station personnel to promptly inspect and handle the situation.

[0062] See Figure 1 The diagram shows a flowchart of a method for monitoring abnormal start / stop limit switches of a main pressure regulating valve according to an embodiment of this application.

[0063] like Figure 1 As shown, a method for monitoring abnormal start-stop limit switches of a main pressure regulating valve is presented. The main pressure regulating valve is applied to the speed control system of a hydropower unit, and specifically includes steps S100 to S300.

[0064] Step S100: Based on the main operating status of the machine, the automatic guide vane mode, and the standby status of the speed control system, perform startup monitoring preparation or shutdown monitoring preparation.

[0065] It should be noted that start / stop limit monitoring preparation will only be activated when the machine is in main operation mode and the guide vane is in automatic mode. Whether start-up monitoring preparation or stop-up monitoring preparation is performed depends on the stop standby status of the speed control system.

[0066] In some feasible embodiments, based on the foregoing scheme, the step of performing start-up monitoring preparation or shutdown monitoring preparation based on the machine's main operating state, guide vane automatic mode, and speed control system shutdown standby state includes:

[0067] When the machine is in main operation mode, the guide vane is in automatic mode, and the speed control system is in standby mode, start-up monitoring preparation is performed.

[0068] When the machine is in main operation mode, the guide vanes are in automatic mode, and the speed control system is not in standby mode, shutdown monitoring preparation is performed.

[0069] In some feasible embodiments, based on the foregoing scheme, the step of performing startup monitoring preparation when the machine is in active mode, the guide vanes are in automatic mode, and the speed control system is in standby mode includes:

[0070] Activate the delay timer for power-on process monitoring;

[0071] Determine whether the real-time value of the main and auxiliary positions is greater than the maximum value of the main and auxiliary positions during the power-on process;

[0072] If yes, update the maximum value of the main and auxiliary positions during the power-on process using the real-time value of the main and auxiliary positions. Otherwise, determine whether the timing of the delay timer used for monitoring the power-on process has reached the power-on monitoring duration. If the time has not been reached, continue to compare and determine whether the real-time value of the main and auxiliary positions is greater than the maximum value of the main and auxiliary positions during the power-on process. If the time has been reached, increase the number of power-on attempts by one and limit the number of power-on attempts to between 0 and the upper limit of the number of power-on attempts, and update the main and auxiliary power-on limit record array.

[0073] In some feasible embodiments, based on the foregoing scheme, the step of performing shutdown monitoring preparation when the machine is in active mode, the guide vanes are in automatic mode, and the speed control system is not in standby mode includes:

[0074] Activate the delay timer for monitoring the shutdown process;

[0075] Determine whether the real-time value of the main and auxiliary positions is less than the minimum value of the main and auxiliary positions during the shutdown process;

[0076] If yes, update the minimum value of the main and auxiliary positions during the shutdown process using the real-time value of the main and auxiliary positions; otherwise, determine whether the timing of the delay timer used for monitoring the shutdown process has reached the shutdown monitoring duration; if the time has not been reached, continue to compare and determine whether the real-time value of the main and auxiliary positions is less than the minimum value of the main and auxiliary positions during the shutdown process; if the time has been reached, increase the shutdown count by one, limit the shutdown count to between 0 and the maximum shutdown count, and update the main and auxiliary shutdown limit record array.

[0077] Continue to refer to Figure 1 Step S200: After the power-on monitoring preparation is completed, power-on limit monitoring is performed based on the number of power-on cycles.

[0078] In some feasible embodiments, based on the foregoing scheme, the step of performing power-on limit monitoring based on the number of power-on cycles after the power-on monitoring preparation is completed includes:

[0079] Determine if the number of power-on attempts exceeds the first power-on attempt threshold. If not, wait for the next main and auxiliary power-on limit record array. If so, compare the absolute value of the deviation between the current power-on limit record and the first power-on limit record to see if it exceeds the alarm value for excessive deviation between the current power-on limit record and the initial power-on record. If it does, generate a main and auxiliary power-on limit abnormality alarm.

[0080] Understandably, when the absolute value of the deviation between the current power-on limit record and the first power-on limit record is greater than the alarm value for excessive deviation between the current power-on limit record and the initial power-on record, it indicates that the main pressure regulating valve power-on limit nut is too loose, and a main pressure regulating valve power-on limit abnormality alarm needs to be generated.

[0081] It should be noted that, under normal circumstances, the threshold value for the first number of startups is 1. If the number of startups is less than or equal to 1, it means that after the self-powered initialization or receiving the reset command, the hydropower unit speed control system has started up less than 2 times in the main mode of the unit through the automatic guide vane mode. At this time, there is not enough data for comparison, so it is necessary to continue to wait for the next update of the main and auxiliary startup limit record array in the startup limit monitoring preparation process described in this method.

[0082] In some feasible embodiments, based on the foregoing scheme, the step of performing power-on limit monitoring based on the number of power-on cycles after the power-on monitoring preparation is completed further includes:

[0083] Determine if the number of power-on attempts exceeds the second power-on attempt threshold. If so, calculate the difference between each pair of the most recent consecutive main and auxiliary power-on limit records. If the difference exceeds the abnormal deviation alarm value in the positive direction or exceeds the opposite number of the abnormal deviation alarm value in the negative direction, an abnormal alarm for the main and auxiliary power-on limit will be generated.

[0084] Among them, the first power-on count threshold is less than the second power-on count threshold.

[0085] It should be noted that the specific value of the second power-on count threshold directly affects the number of consecutive times in calculating the difference between each pair of the most recent consecutive main and auxiliary power-on limit records. For example, if the second power-on count threshold is 3, then the difference between each pair of the most recent 3 consecutive main and auxiliary power-on limit records will be calculated.

[0086] It should be noted that when the difference between any two main control valve start-up limit records exceeds the abnormal deviation alarm value in a positive direction several times in a row, it indicates that the start-up limit nut of the main control valve has obvious signs of loosening in a positive direction; when the difference between any two main control valve start-up limit records exceeds the opposite number of the abnormal deviation alarm value in a negative direction several times in a row, it indicates that the start-up limit nut of the main control valve has obvious signs of loosening in a negative direction; in both of these cases, an abnormal alarm for the main control valve start-up limit should be generated.

[0087] Continue to refer to Figure 1 In step S300, after the shutdown monitoring preparation is completed, shutdown limit monitoring is performed based on the number of shutdowns.

[0088] In some feasible embodiments, based on the foregoing scheme, the step of performing shutdown limit monitoring based on the number of shutdowns after shutdown monitoring preparation is completed includes:

[0089] Determine if the number of shutdowns exceeds the first shutdown threshold. If not, wait for the next main and auxiliary shutdown limit record array. If so, compare the absolute value of the deviation between the current shutdown limit record and the first shutdown limit record to see if it exceeds the alarm value for excessive deviation between the current shutdown limit record and the initial shutdown record. If it does, generate a main and auxiliary shutdown limit abnormality alarm.

[0090] It should be noted that, under normal circumstances, the threshold value for the first number of startups is 1. If the number of shutdowns is less than or equal to 1, it means that after the self-powered initialization or receiving the reset command, the hydropower unit speed control system has stopped less than 2 times in the main mode of the unit through the automatic guide vane mode. At this time, there is not enough data for comparison, so it is necessary to continue to wait for the next update of the main and auxiliary shutdown limit record array in the shutdown limit monitoring preparation process described in this method.

[0091] In some feasible embodiments, based on the foregoing scheme, the step of performing stop limit monitoring based on the number of stops after the stop monitoring preparation is completed further includes:

[0092] Determine if the number of shutdowns exceeds the second shutdown number threshold. If so, calculate the difference between each pair of the most recent consecutive main and auxiliary shutdown limit records. If the difference exceeds the abnormal deviation alarm value in the positive direction or exceeds the opposite number of the abnormal deviation alarm value in the negative direction, an abnormal alarm for the main and auxiliary shutdown limit will be generated.

[0093] Among them, the first downtime threshold is less than the second downtime threshold.

[0094] It should be noted that the specific value of the second shutdown number threshold directly affects the number of consecutive times in the calculation of the difference between each pair of the most recent consecutive main and auxiliary shutdown limit records. For example, if the second startup number threshold is 3, then the difference between each pair of the most recent 3 consecutive main and auxiliary shutdown limit records will be calculated.

[0095] It should be noted that when the difference between any two main control valve stop limit records exceeds the abnormal deviation alarm value in a positive direction several times in a row, it indicates that the main control valve stop limit nut has obvious signs of being loose in the positive direction; when the difference between any two main control valve stop limit records exceeds the opposite number of the abnormal deviation alarm value in a negative direction several times in a row, it indicates that the main control valve stop limit nut has obvious signs of being loose in the negative direction; in both cases, an abnormal alarm for the main control valve stop limit should be generated.

[0096] It is understood that the start-up limit monitoring and stop-down limit monitoring described in steps S200 and S300 of the technical solution of this application can not only generate an alarm when the start-up and stop-down limit nuts of the main pressure regulating valve have a large amount of loosening, but also generate an alarm in advance when the start-up and stop-down limit nuts of the main pressure regulating valve show obvious signs of loosening in the same direction three times in a row.

[0097] The following describes an embodiment of the apparatus described in this application, which can be used to execute a method for monitoring abnormal start-up and shutdown limits of a main pressure regulating valve as described in the above embodiments of this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the method described in this application.

[0098] Reference Figure 2 As shown, a main pressure regulating valve start-up and stop limit abnormality monitoring device according to an embodiment of this application includes: start-up monitoring preparation module 201, stop monitoring preparation module 202, start-up limit monitoring module 203 and stop limit monitoring module 204.

[0099] The system includes a startup monitoring preparation module 201, which performs startup monitoring preparation based on the main operating status of the machine, the automatic guide vane mode, and the standby status of the speed control system; a shutdown monitoring preparation module 202, which performs shutdown monitoring preparation based on the main operating status of the machine, the automatic guide vane mode, and the standby status of the speed control system; a startup limit monitoring module 203, which performs startup limit monitoring based on the number of startups after startup monitoring preparation is completed; and a shutdown limit monitoring module 204, which performs shutdown limit monitoring based on the number of shutdowns after shutdown monitoring preparation is completed.

[0100] Below is a specific example of implementing this method using a device.

[0101] Figure 3 and Figure 4 This constitutes a method for monitoring abnormal start-up limit switches of the main pressure regulating valve, consisting of modules 1 to 32. The specific steps are as follows:

[0102] It should be noted that the modules described in this example are specific types of the power-on monitoring preparation module 201, power-off monitoring preparation module 202, power-on limit monitoring module 203, or power-off limit monitoring module 204 recorded in the above embodiment.

[0103] Step 1: The main pressure regulating valve start-up limit monitoring enable control is implemented by a combination of modules 1 to 3. Module 1 is an AND logic operation module. When all three conditions are met—main operation state, automatic guide vane mode, and speed control system shutdown standby state—if a speed control system start-up command is received and the shutdown limit monitoring enable is not engaged, the operation result is true. Module 2 is a rising edge triggered module. It outputs true the instant the operation result of module 1 changes from false to true, and outputs false at other times. Module 3 is a timer module with a delay before disconnection. When the output result of module 2 is true, it sets the start-up limit monitoring enable. After the output result of module 2 is false, it outputs false after a delay T. a Post-reset power-on limit monitoring enabled. The power-on monitoring duration T for the speed control system is also specified. aThe automatic start-up time of the hydropower unit is determined by historical start-up data, with an appropriate margin of 1.05 to 1.2 times. The preferred value is 2 minutes and 14 seconds.

[0104] Step 2: Initial value preparation, consisting of modules 4 and 5. Module 4 assigns the real-time master / slave position value to the maximum master / slave position value during the power-on process when power-on monitoring is not enabled. Module 5 clears the power-on count m to zero upon receiving a reset command.

[0105] Step 3: Record the maximum value of the master / slave position during this power-on process, which consists of modules 6 and 7. Module 6 is a greater-than comparison module. When the power-on limit monitoring is enabled, if the real-time value of the master / slave position is greater than the maximum value of the master / slave position during the power-on process, then module 7 is enabled. The record of the maximum value of the master / slave position during the power-on process is updated through module 7.

[0106] Step 4: Update the power-on count statistics and write them to the main and auxiliary power-on limit record array, which consists of modules 8 to 11. Modules 8 to 10 first update the power-on count m, and then module 11 writes the maximum value of the main and auxiliary positions during this power-on process to the main and auxiliary power-on limit record array. Module 8 is a falling edge triggered module. When the power-on limit monitoring enable exits, module 9 updates the power-on count m. Module 9 is followed by the limiting module 10, which limits the power-on count m to between 0 and the statistical upper limit C. m Within this range, to prevent subsequent modules 11 from writing to the boot record array beyond the access range.

[0107] Among them, the upper limit of the number of start-up and shutdown counts is C. m The value should not be too small or too large. If it is too small, the governor start-stop count will not be sufficient for the next maintenance cycle, and the alarm for loosening of the start-stop limit nuts will not be effectively detected after the start-stop count reaches the upper limit. If it is too large, the lengths of the main and auxiliary start-stop limit record arrays and the main and auxiliary stop-stop limit record arrays are both limited by the upper limit C of the start-stop count. m The decision will result in these two arrays having excessively large definitions, consuming controller memory. The upper limit C for counting start / stop times. m The number of unit start-ups and shutdowns depends on the hydropower station's maintenance cycle, and can be determined by adding a margin of 1.05 to 1.25 times the historical start-up and shutdown statistics. Preferably, the upper limit C for the statistical count of start-ups and shutdowns is... m Take 256.

[0108] Step 5: The power-on limit monitoring and alarm function consists of modules 12 to 32. Modules 12 to 16 form a main pressure valve power-on limit nut loosening too much alarm. Module 12 determines if the number of power-on cycles m is greater than 1. If m is greater than 1, module 13 calculates the difference between the most recent main pressure valve power-on limit record and the first main pressure valve power-on limit record. Then, module 14 takes the absolute value. If the absolute value of this deviation exceeds the alarm value L1 for excessive deviation between the current power-on limit record and the initial power-on record, and the number of power-on cycles m is greater than 1, then module 15 generates a main pressure valve power-on limit nut loosening too much alarm. Modules 17 to 31 form a main pressure valve power-on limit nut loosening trend alarm. Module 17 determines if the number of power-on cycles is greater than 3. If m is greater than 3, this alarm monitoring function is enabled. Modules 18 to 24 determine whether the deviation between the three most recent consecutive main and distribution valve start-up records all positively exceeds the abnormal deviation alarm value L2. If so, module 24 generates an alarm indicating excessive positive loosening of the main distribution valve start-up limit nut. Modules 25 to 31 determine whether the deviation between the three most recent consecutive main and distribution valve start-up records all negatively exceeds the opposite number of the abnormal deviation alarm value -L2. If so, module 31 generates an alarm indicating excessive negative loosening of the main distribution valve start-up limit nut. Module 32 is an OR logic module used to summarize the above three alarms, trigger an abnormal start-up limit alarm, and notify hydropower station staff to check and handle the situation promptly.

[0109] The alarm value L1, which indicates a large deviation between the current start-up limit record and the initial record, is set manually in advance and depends on the allowable error range of the main and auxiliary start-up target speed. Preferably, this value is 10%. The alarm value L2, which indicates abnormal deviation in the most recent three consecutive start-up records, depends on the measurement accuracy of the real-time displacement of the main and auxiliary equipment and takes into account the displacement changes caused by the thermal expansion and contraction of the mechanical equipment. Preferably, this value is 2%.

[0110] Figure 5 and Figure 6 This constitutes a method for monitoring abnormal shutdown limit switches of the main pressure regulating valve, consisting of modules 33 to 64. The specific steps are as follows:

[0111] Step 6: The main pressure regulating valve shutdown limit monitoring enable control is implemented by a combination of modules 33 to 35. Module 33 is an AND logic operation module. When all three conditions are met—main operation state, guide vane automatic mode, and non-speed control system shutdown standby state—if a speed control system shutdown command is received and the start-up limit monitoring enable is not engaged, the operation result is true. Module 34 is a rising edge triggered module. It outputs true the instant the operation result of module 33 changes from false to true, and outputs false at other times. Module 35 is a timer module with a delay before disconnection. When the output result of module 34 is true, it sets the shutdown limit monitoring enable. After the output result of module 34 is false, it outputs false after a delay T. bPost-reset stop limit monitoring enabled. The stop monitoring duration T for the speed control system is specified. b The automatic shutdown time of the hydropower unit is determined by the test data of segmented shutdown, and then the value is determined by reserving an appropriate margin of 1.05 to 1.2 times. The preferred value is 31 seconds.

[0112] Step 7: Initial value preparation, consisting of modules 36 and 37. Module 36 assigns the real-time value of the primary and secondary positions to the minimum value of the primary and secondary positions during the shutdown process when shutdown monitoring is not enabled. Module 37 resets the shutdown count n to zero upon receiving a reset command.

[0113] Step 8: Record the minimum value of the main and auxiliary positions during this shutdown process, which is composed of modules 38 and 39. Module 38 is a less-than comparison module. When the shutdown limit monitoring is enabled, if the real-time value of the main and auxiliary positions is smaller than the minimum value of the main and auxiliary positions during the startup process, then module 39 is enabled. The minimum value record of the main and auxiliary positions during the shutdown process is updated through module 39.

[0114] Step 9: Update the shutdown count statistics and write them to the main / partition power-on limit record array, consisting of modules 40 to 43. Modules 40 to 42 first update the shutdown count n, and then module 43 writes the maximum value of the main / partition position during this power-on process to the main / partition power-on limit record array. Module 40 is a falling edge triggered module. When the power-on limit monitoring enable exits, module 41 updates the shutdown count n. Module 41 is followed by a limiting module 42, which limits the power-on count m to between 0 and the statistical upper limit C. m Within this range, to prevent subsequent module 43 from writing to the shutdown record array beyond the access range.

[0115] Step 10: The shutdown limit monitoring alarm function consists of modules 44 to 64. Modules 44 to 48 form an alarm for excessive loosening of the main pressure regulating valve shutdown limit nut. Module 44 determines whether the number of start-ups (m) is greater than 1. If the number of shutdowns (n) is greater than 1, module 45 calculates the difference between the most recent main pressure regulating valve shutdown limit record and the first main pressure regulating valve shutdown limit record. Then, module 46 takes the absolute value. If the absolute value of this deviation exceeds the alarm value L3 for excessive deviation between the current shutdown limit record and the initial shutdown record, and the number of shutdowns (n) is greater than 1, then module 48 generates an alarm for excessive loosening of the main pressure regulating valve shutdown limit nut. Modules 49 to 63 form an alarm for a loosening trend of the main pressure regulating valve shutdown limit nut. Module 49 determines whether the number of shutdowns is greater than 3. If the number of shutdowns (n) is greater than 3, this alarm monitoring function is enabled. Modules 50 to 56 determine whether the deviation between the three most recent consecutive main and distribution valve shutdown records all positively exceeds the abnormal deviation alarm value L4. If so, module 56 generates an alarm indicating excessive positive loosening of the main distribution valve shutdown limit nut. Modules 51 to 63 determine whether the deviation between the three most recent consecutive main and distribution valve start-up records all negatively exceeds the opposite of the abnormal deviation alarm value -L3. If so, module 63 generates an alarm indicating excessive negative loosening of the main distribution valve start-up limit nut. Module 64 is an OR logic module used to summarize the above three alarms, trigger an abnormal shutdown limit alarm, and notify hydropower station personnel to check and handle the situation promptly.

[0116] The alarm value L3, which indicates a large deviation between the current stop limit record and the initial record, is set manually in advance and depends on the allowable error range of the main equipment stop target speed. Preferably, this value is 11%. The alarm value L4, which indicates abnormal deviation in the most recent three consecutive stop records, depends on the measurement accuracy of the real-time displacement of the main equipment and takes into account the displacement changes caused by the thermal expansion and contraction of the mechanical equipment. Preferably, this value is 2.7%.

[0117] When using this invention during hydropower unit maintenance, the main pressure regulating valve start / stop limit nuts should first be adjusted and tightened as required. Before the unit's first normal automatic start / stop, a reset command for the main pressure regulating valve start / stop limit anomaly monitoring is issued, resetting the start / stop count to zero and resetting the start / stop limit anomaly alarm. In subsequent automatic start / stop operations, this invention can automatically record the main pressure regulating valve start / stop limit position reflected by the valve core position during each automatic start / stop process.

[0118] When the number of start-ups and shutdowns exceeds 1, the deviation between the start-up and shutdown limit positions of the main pressure regulating valve recorded during the current start-up and shutdown process and the start-up and shutdown limit positions of the main pressure regulating valve recorded during the first start-up and shutdown can be calculated. If the deviation is too large, an alarm will be generated indicating that the start-up and shutdown limit nut of the main pressure regulating valve is too loose.

[0119] When the number of start-stop cycles exceeds 3, the trend of the main pressure regulating valve start-stop limit position recorded during the most recent three consecutive start-stop cycles can be calculated. If the main pressure regulating valve limit position recorded during the most recent three start-stop cycles deviates from a certain significant value in the same direction, an alarm will be generated indicating that the main pressure regulating valve start-stop limit nut is loose.

[0120] Both alarms indicating excessive loosening of the main pressure regulating valve core start / stop limit nut and alarms indicating a loosening trend will trigger the final alarm for abnormal start / stop limit nut of the main pressure regulating valve.

[0121] This example demonstrates the technical solution of this application. This method can be implemented without adding hardware to the existing hydropower speed regulation system, through programming of the existing controller. It is easy to implement and has good economic benefits.

[0122] like Figure 7 As shown, this application embodiment also provides an electronic device 700, including a memory 710, a processor 720, and a computer program 711 stored in the memory 710 and executable on the processor. When the processor 720 executes the computer program 711, it implements any of the steps of the above-mentioned method for monitoring the abnormal start-stop limit of the main pressure regulating valve.

[0123] Since the electronic device described in this embodiment is the device used to implement the main pressure regulating valve start-stop limit abnormality monitoring device in the embodiment of this application, those skilled in the art can understand the specific implementation method and various variations of the electronic device in this embodiment based on the method described in the embodiment of this application. Therefore, how the electronic device implements the method in the embodiment of this application will not be described in detail here. Any device used by those skilled in the art to implement the method in the embodiment of this application is within the scope of protection of this application.

[0124] In practice, when the computer program 711 is executed by the processor, it can implement any of the embodiments corresponding to the first aspect.

[0125] Figure 8 A schematic diagram of the structure of a computer system suitable for implementing the electronic device of the present application is shown.

[0126] It should be noted that, Figure 8 The computer system 800 of the electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0127] like Figure 8As shown, the computer system 800 includes a Central Processing Unit (CPU) 801, which can perform various appropriate actions and processes based on programs stored in Read-Only Memory (ROM) 802 or programs loaded from storage portion 808 into Random Access Memory (RAM) 803, such as performing the methods described in the above embodiments. The RAM 803 also stores various programs and data required for system operation. The CPU 801, ROM 802, and RAM 803 are interconnected via a bus 804. An Input / Output (I / O) interface 805 is also connected to the bus 804.

[0128] The following components are connected to I / O interface 805: an input section 806 including a keyboard, mouse, etc.; an output section 807 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 808 including a hard disk, etc.; and a communication section 809 including a network interface card such as a LAN (Local Area Network) card, modem, etc. The communication section 809 performs communication processing via a network such as the Internet. A drive 810 is also connected to I / O interface 805 as needed. A removable medium 811, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on drive 810 as needed so that computer programs read from it can be installed into storage section 808 as needed.

[0129] Specifically, according to embodiments of this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 809, and / or installed from removable medium 811. When the computer program is executed by central processing unit (CPU) 801, it performs various functions defined in the system of this application.

[0130] It should be noted that the computer-readable medium shown in the embodiments of this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such transmitted data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.

[0131] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. Each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0132] The units described in the embodiments of this application can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself.

[0133] In another aspect, this application also provides a computer program product or computer program including computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the main pressure regulating valve start-stop limit anomaly monitoring method described in the above embodiments.

[0134] In another aspect, this application also provides a computer-readable medium, which may be included in the electronic device described in the above embodiments; or it may exist independently and not assembled into the electronic device. The computer-readable medium carries one or more programs, which, when executed by the electronic device, cause the electronic device to implement the main pressure regulating valve start-stop limit anomaly monitoring method described in the above embodiments.

[0135] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of this application, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0136] Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, touch terminal, or network device, etc.) to execute the method according to the embodiments of this application.

[0137] Other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. It should be understood that this application is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for monitoring abnormal start / stop limit switches of a main pressure regulating valve, wherein the main pressure regulating valve is used in a hydropower unit speed control system, characterized in that... include: Based on the main operating status of the machine, the automatic guide vane mode, and the standby status of the speed control system, prepare for startup monitoring or shutdown monitoring. After the power-on monitoring preparation is completed, power-on limit monitoring is performed based on the number of power-on attempts. After the shutdown monitoring preparation is completed, shutdown limit monitoring is performed based on the number of shutdowns. The preparation for startup monitoring or shutdown monitoring based on the machine's primary status, guide vane automatic mode, and speed control system shutdown / standby status includes: When the machine is in main operation mode, the guide vane is in automatic mode, and the speed control system is in standby mode, start-up monitoring preparation is performed. When the machine is in main operation mode, the guide vane is in automatic mode and the speed control system is not in standby mode, prepare for shutdown monitoring. When the machine is in main operation mode, the guide vanes are in automatic mode, and the speed control system is in standby mode, the startup monitoring preparation includes: Activate the delay timer for power-on process monitoring; Determine whether the real-time value of the main and auxiliary positions is greater than the maximum value of the main and auxiliary positions during the power-on process; If yes, update the maximum value of the main and auxiliary positions during the power-on process using the real-time value of the main and auxiliary positions. Otherwise, determine whether the timing time of the delay timer used for monitoring the power-on process has reached the power-on monitoring duration. If the time has not been reached, continue to compare and determine whether the real-time value of the main and auxiliary positions is greater than the maximum value of the main and auxiliary positions during the power-on process. If the time has been reached, increase the number of power-on attempts by one and limit the number of power-on attempts to between 0 and the upper limit of the number of power-on attempts. Update the main and auxiliary power-on limit record array. After the power-on monitoring preparation is completed, the power-on limit monitoring is performed based on the number of power-on cycles, including: Determine if the number of power-on attempts exceeds the first power-on attempt threshold. If not, wait for the next main and auxiliary power-on limit record array. If so, compare the absolute value of the deviation between the current power-on limit record and the first power-on limit record to see if it exceeds the alarm value for excessive deviation between the current power-on limit record and the initial power-on record. If it does, generate a main and auxiliary power-on limit abnormality alarm. The step of performing power-on limit monitoring based on the number of power-on cycles after the power-on monitoring preparation is completed also includes: Determine if the number of power-on attempts exceeds the second power-on attempt threshold. If so, calculate the difference between each pair of the most recent consecutive main and auxiliary power-on limit records. If the difference exceeds the abnormal deviation alarm value in the positive direction or exceeds the opposite number of the abnormal deviation alarm value in the negative direction, an abnormal alarm for the main and auxiliary power-on limit will be generated. Among them, the first power-on count threshold is less than the second power-on count threshold.

2. The method according to claim 1, characterized in that, When the machine is in active mode, the guide vanes are in automatic mode, and the speed control system is not in standby mode, the shutdown monitoring preparation includes: Activate the delay timer for monitoring the shutdown process; Determine whether the real-time value of the main and auxiliary positions is less than the minimum value of the main and auxiliary positions during the shutdown process; If yes, update the minimum value of the main and auxiliary positions during the shutdown process using the real-time value of the main and auxiliary positions; otherwise, determine whether the timing of the delay timer used for monitoring the shutdown process has reached the shutdown monitoring duration; if the time has not been reached, continue to compare and determine whether the real-time value of the main and auxiliary positions is less than the minimum value of the main and auxiliary positions during the shutdown process; if the time has been reached, increase the shutdown count by one, limit the shutdown count to between 0 and the maximum shutdown count, and update the main and auxiliary shutdown limit record array.

3. The method according to any one of claims 1-2, characterized in that, After the shutdown monitoring preparation is completed, the shutdown limit monitoring is performed based on the number of shutdowns, including: Determine if the number of shutdowns exceeds the first shutdown threshold. If not, wait for the next main and auxiliary shutdown limit record array. If so, compare the absolute value of the deviation between the current shutdown limit record and the first shutdown limit record to see if it exceeds the alarm value for excessive deviation between the current shutdown limit record and the initial shutdown record. If it does, generate a main and auxiliary shutdown limit abnormality alarm.

4. The method according to claim 1, characterized in that, The step of performing stop limit monitoring based on the number of stops after the stop monitoring preparation is completed also includes: Determine if the number of shutdowns exceeds the second shutdown number threshold. If so, calculate the difference between each pair of the most recent consecutive main and auxiliary shutdown limit records. If the difference exceeds the abnormal deviation alarm value in the positive direction or exceeds the opposite number of the abnormal deviation alarm value in the negative direction, an abnormal alarm for the main and auxiliary shutdown limit will be generated. Among them, the first downtime threshold is less than the second downtime threshold.

5. A main pressure regulating valve start / stop limit abnormality monitoring device, applied to the method described in any one of claims 1-4, wherein the main pressure regulating valve is applied to the hydropower unit speed control system, characterized in that... include: The power-on monitoring and preparation module is used to perform power-on monitoring and preparation based on the main operating status of the machine, the automatic guide vane mode, and the shutdown and standby status of the speed control system. The shutdown monitoring and preparation module is used to perform shutdown monitoring and preparation based on the main operating status of the machine, the automatic guide vane mode, and the shutdown standby status of the speed control system. The power-on limit monitoring module is used to perform power-on limit monitoring based on the number of power-on cycles after power-on monitoring preparation is completed; The shutdown limit monitoring module is used to perform shutdown limit monitoring based on the number of shutdowns after shutdown monitoring preparation is completed.

6. An electronic device, characterized in that, Including memory and processor; The memory is used to store computer instructions; The processor is configured to invoke computer instructions stored in the memory, causing the electronic device to perform the method as described in any one of claims 1-4.

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