Method and system for judging opening jump fault of fast door of large hydropower station

Abstract

The invention discloses a large hydropower station fast gate opening jump fault judgment method and system, and the method comprises the steps: configuring gate control system hardware, carrying out the gate code value jump enabling judgment according to the valve action state of a dual valve execution mechanism, and when the jump of the gate opening in a single PLC scanning period exceeds a first threshold value, carrying out the gate code value jump enabling judgment; when the gate opening degree continuously jumps in the same direction and exceeds a first threshold value, triggering single-cycle alarm and total alarm, when the gate opening degree continuously jumps in the same direction and exceeds a second threshold value and the number of times reaches a preset value, triggering multi-cycle alarm and total alarm, executing alarm automatic reset after the fault is eliminated, and resetting the alarm through continuous stable state detection or manual operation. When the gate is in a normal state, the change of the opening degree of the gate is monitored stably in real time, the false alarm rate can be remarkably reduced, and interference to operation and maintenance personnel is reduced. And when the gate has an opening jump fault, the fault can be effectively prevented from being missed to be reported, so that maintenance personnel can quickly and accurately position the fault. And after the fault disappears, the fault can be reliably and automatically reset, and the influence on equipment is reduced.

Description

Technical Field

[0001] This application relates to the field of automation control technology. Specifically, it relates to a method and system for judging the opening jump fault of a fast gate in a large hydropower station. Background Art

[0002] At present, the automatic control system of large hydro-generating units is usually implemented by a local control unit (LCU) composed of digital devices such as programmable logic controllers (PLCs). When major accidents occur in the hydropower station units (such as the guide vane cannot be closed normally, the access hole door of the spiral case ruptures, etc.), in order to avoid serious safety accidents such as unit runaway and flooding of the powerhouse, emergency shutdown and rapid gate lowering measures must be taken. Among them, the reliable operation of the fast gate is the last line of defense to ensure the safety of the power station. Its function is to quickly cut off the water flow, block the energy exchange between the unit and the outside world, and ensure the safety of equipment and the powerhouse.

[0003] The operating states of the fast gate mainly include the static state, the opening state, the closing state, and the fast closing state. During the gate operation process, the measured value of the opening sensor changes in real time. However, due to factors such as electromagnetic interference, zero drift of semiconductor devices, and anti-interference construction quality defects in the industrial field, the actual opening signal often shows abnormal conditions such as deviation and jump. Therefore, the trigger logic design for the fast gate opening jump fault is crucial.

[0004] The traditional opening jump fault judgment logic usually combines a fixed threshold with a delay determination. Specifically, it is manifested as follows: when the opening jump value exceeds 300 code values and lasts for 300 ms, an alarm is triggered; when the opening jump value exceeds 300 code values and lasts for 20 s, a shutdown and emergency gate lowering are triggered. However, the defects of this traditional method are as follows: First, the fixed threshold of 300 code values does not consider the non-linear characteristics of the sensor (such as mechanical clearance, dead zone, etc.), resulting in a linear conversion error of the actual opening stroke, and may be misjudged due to insufficient effective resolution; Second, the judgment window of 300 ms is too short, and the electromechanical system may generate transient interference of 300 - 500 ms when the load changes suddenly, which is easy to cause false alarms; the delay of 20 s for severe fault determination is too long. For fast actuators such as hydraulic drives, an abnormal state lasting for 20 s may lead to catastrophic consequences (such as gate jamming or system failure); Third, after the fault is triggered, manual intervention is required for reset, which affects production continuity and reduces the reliability and automation level of the system. Therefore, there is an urgent need for a more accurate, fast and self-recovering opening jump fault judgment method to improve the safety and reliability of the fast gate control system of hydropower units. Summary of the Invention

[0005] The purpose of this application is to overcome the existing technical defects and provide a method and system for judging the opening jump fault of a large hydropower station's quick gate. When the gate has an opening jump fault, it can effectively prevent false alarms of faults and facilitate maintenance personnel to quickly and accurately locate the fault. After the fault disappears, it can reliably and automatically reset the fault, reducing the impact on the equipment.

[0006] The purpose of this application is achieved through the following technical solutions:

[0007] In the first aspect, this application proposes a method for judging the opening jump fault of a large hydropower station's quick gate, and the method includes:

[0008] Configure the hardware of the gate control system, including a programmable logic controller, an absolute displacement encoder, and a dualized valve actuator. The dualized valve actuator includes the opening valves YV2 and YV2', the closing valves YV3 and YV3', and the quick closing valves YV4 and YV4';

[0009] Judge the enabling of gate code value jump according to the valve action state of the dualized valve actuator;

[0010] When the gate opening jumps by more than the first threshold within a single PLC scan cycle, trigger the single-cycle alarm and the total alarm;

[0011] When the gate opening continuously jumps in the same direction by more than the second threshold and the number of times reaches the preset value, trigger the multi-cycle alarm and the total alarm;

[0012] After the fault is eliminated, execute the automatic reset of the alarm, and restore the alarm through continuous stable state detection or manual operation.

[0013] In a possible implementation manner, the step of judging the enabling of gate code value jump according to the valve action state of the dualized valve actuator includes:

[0014] When the opening valves YV2 and YV2' or the closing valves YV3 and YV3' act, trigger the judgment of the enabling of gate code value jump after a preset time delay;

[0015] Directly trigger the judgment of the enabling of gate code value jump in the static state of the gate;

[0016] Disable the judgment of the enabling of gate code value jump when the quick closing valves YV4 and YV4' act.

[0017] In a possible implementation manner, the control signals of the dualized valve actuator adopt an OR logic judgment.

[0018] In a possible implementation manner, the triggering condition of the single-cycle alarm is:

[0019] The judgment of the enabling of gate code value jump is true;

[0020] The absolute value of the jump of the opening code value between the current cycle and the previous cycle is greater than 50 code values.

[0021] In a possible implementation, the triggering condition for multi-cycle alarm is:

[0022] The gate code value jump enable judgment is true;

[0023] The absolute value of the continuous jump of the gate opening in the same direction is greater than 25 code values;

[0024] The number of continuous jumps of the gate opening in the same direction is greater than 5.

[0025] In a possible implementation, the conditions for automatic alarm reset include:

[0026] After the single-cycle or multi-cycle alarm is triggered, the absolute value of the jump of the gate opening is less than 10 code values within 100 consecutive cycles;

[0027] Through on-site manual or remote forced reset instructions from the monitoring system.

[0028] In a possible implementation, the resolution of the absolute displacement encoder is 0.1 mm, and the code value range is 0 to 10,000.

[0029] In a possible implementation, the scan cycle of the programmable logic controller is in milliseconds, and the single-cycle jump detection is based on the scan cycle of the programmable logic controller as the reference time unit.

[0030] In a second aspect, the present application proposes a large hydropower station fast gate opening jump fault judgment system, and the system includes:

[0031] A programmable logic controller for performing jump detection, alarm logic, and reset control;

[0032] A dual-valve actuator for opening or closing the opening valve YV2 and YV2', the closing valve YV3 and YV3', and the fast closing valve YV4 and YV4';

[0033] An absolute displacement encoder for feeding back the gate opening code value to the programmable logic controller.

[0034] In a possible implementation, the system further includes:

[0035] A communication interface module for connecting the programmable logic controller to the power station monitoring system and uploading the single-cycle alarm, multi-cycle alarm, total alarm status, and real-time gate opening code value in real time;

[0036] A fault history database for storing the time stamp, jump amplitude, associated valve action status, and alarm reset record of the jump event, and supporting remote query and analysis.

[0037] The main solution of the present application and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted and claimed by the present application; and in the present application, (each non-conflicting alternative) alternatives and other alternatives can also be freely combined. Those skilled in the art can understand that there are various combinations according to the prior art and common general knowledge after understanding the solution of the present application, all of which are the technical solutions to be protected by the present application, and will not be enumerated here.

[0038] The present application discloses a method and system for judging the opening jump fault of a fast gate in a large hydropower station. Configure the hardware of the gate control system, and judge the enabling of the gate code value jump according to the valve action state of the dual redundant valve actuator. When the gate opening jumps by more than the first threshold within a single PLC scan cycle, trigger the single-cycle alarm and the total alarm. When the gate opening continuously jumps in the same direction by more than the second threshold and the number of times reaches the preset value, trigger the multi-cycle alarm and the total alarm. After the fault is eliminated, perform automatic reset of the alarm, and restore the alarm through continuous stable state detection or manual operation. When the gate is in the normal state, monitor the change of the gate opening in real time and stably, and can significantly reduce the false alarm rate and reduce the interference to the operation and maintenance personnel. When the gate opening jump fault occurs, it can effectively prevent the omission of fault reporting, facilitating the maintenance personnel to quickly and accurately locate the fault. After the fault disappears, it can reliably and automatically restore the fault, reducing the impact on the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0040] Figure 1 The flowchart showing the method for judging the opening jump fault of a fast gate in a large hydropower station proposed by the embodiment of the present application.

[0041] Figure 2 The logic flowchart showing the monitoring of the opening jump fault of a gate proposed by the embodiment of the present application.

[0042] Figure 3 The logic flowchart showing another monitoring of the opening jump fault of a gate proposed by the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] The following specific examples illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0044] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope protected by the present application.

[0045] In the prior art, the traditional opening jump fault judgment logic usually adopts a combination of a fixed threshold and a delay determination, specifically manifested as follows: when the opening jump value exceeds 300 code values and lasts for 300 ms, an alarm is triggered; when the opening jump value exceeds 300 code values and lasts for 20 s, a shutdown and an emergency door lowering are triggered. However, the defects of this traditional method are as follows: First, the fixed threshold of 300 code values does not consider the non-linear characteristics of the sensor (such as mechanical clearance, dead zone, etc.), resulting in a linear conversion error of the actual opening stroke, and may be misjudged due to insufficient effective resolution; Second, the judgment window of 300 ms is too short, and the electromechanical system may generate a transient interference of 300 - 500 ms when the load suddenly changes, which is prone to false alarms; the delay of 20 s for severe fault determination is too long. For a fast actuator such as a hydraulic drive, an abnormal state lasting for 20 s may lead to catastrophic consequences (such as gate jamming or system failure); Third, manual intervention is required for resetting after the fault is triggered, which affects the production continuity and reduces the reliability and automation level of the system. Therefore, there is an urgent need for a more accurate, fast and self-recovering opening jump fault judgment method to improve the safety and reliability of the fast gate control system of a hydropower unit.

[0046] Therefore, to solve the above problems, the embodiments of the present application propose a method and system for judging the opening jump fault of a fast gate in a large hydropower station. When the gate is in a normal state, it can stably monitor the change of the gate opening in real time, and can significantly reduce the false alarm rate and reduce the interference to the operation and maintenance personnel. When an opening jump fault occurs to the gate, it can effectively prevent the omission of fault reporting, which is convenient for maintenance personnel to quickly and accurately locate the fault. After the fault disappears, it can reliably and automatically reset the fault, reducing the impact on the equipment. Through this method, accidents such as unit runaway and flooding of the powerhouse can be effectively avoided, thereby ensuring the safe and stable operation of power equipment. Next, a detailed description will be given.

[0047] Please refer to Figure 1 , Figure 1The flowchart shows a method for judging the fault of sudden change in the opening of a fast gate in an embodiment of the present application. The method includes:

[0048] Step S1: Configure the hardware of the gate control system, including a programmable logic controller, an absolute displacement encoder, and a dual valve actuator. The dual valve actuator includes opening valves YV2 and YV2', closing valves YV3 and YV3', and fast closing valves YV4 and YV4'.

[0049] Step S2: Judge the enabling of gate code value jump according to the valve action state of the dual valve actuator.

[0050] Step S3: When the gate opening jumps by more than the first threshold within a single PLC scan cycle, trigger single-cycle alarm and total alarm.

[0051] Step S4: When the gate opening continuously jumps in the same direction by more than the second threshold and the number of jumps reaches the preset value, trigger multi-cycle alarm and total alarm.

[0052] Step S5: After the fault is eliminated, execute automatic reset of the alarm, and restore the alarm through continuous stable state detection or manual operation.

[0053] The programmable logic controller (PLC) is responsible for performing logical operations and control. A high-performance PLC that supports millisecond-level cycle scanning (such as Siemens S7-1500) is selected. The absolute displacement encoder is used to monitor the change of the gate opening in real time. The resolution of the absolute displacement encoder is 0.1 mm, and the code value range is 0 to 10,000. The scan cycle of the programmable logic controller is at the millisecond level, and the single-cycle jump detection is based on the scan cycle of the programmable logic controller as the reference time unit.

[0054] In the dual valve actuator, it includes opening valves YV2 (main) + YV2' (spare), closing valves YV3 (main) + YV3' (spare), and fast closing valves YV4 (main) + YV4' (spare). The dual design ensures the high reliability of the system and avoids single-point failure.

[0055] According to the action states of the opening valve, closing valve, and fast closing valve, dynamically judge whether to enable the gate opening jump detection logic. The specific rules are as follows:

[0056] If the opening valve YV2 or YV2' acts, trigger "gate code value jump enabling" after a 3-second delay.

[0057] If the closing valve YV3 or YV3' acts, trigger "gate code value jump enabling" after a 3-second delay.

[0058] If the fast closing valve YV4 or YV4' acts, directly restore "gate code value jump enabling".

[0059] When the gate is in the static state (both the opening valve and the closing valve are not actuated), directly trigger the "gate code value jump enabling".

[0060] When the gate opening jumps by more than the first threshold (50 code values) within a single PLC scan cycle, trigger the single-cycle jump alarm and the total alarm. The single-cycle jump alarm indicates that the gate opening has undergone a drastic mutation, and the total alarm can comprehensively summarize all types of jump alarms. When the gate opening continuously jumps in the same direction by more than the second threshold (25 code values) and the number of jumps reaches the preset value (5 times), trigger the multi-cycle slow change alarm and the total alarm. The multi-cycle slow change alarm indicates that there is an abnormal slow accumulation in the gate opening, and the total alarm comprehensively summarizes all types of jump alarms.

[0061] After the fault is eliminated, reset the alarm through automatic reset or manual reset. Automatic reset is when the gate opening jumps less than the third threshold (10 code values) for 100 consecutive times, and all alarms are reset. Manual reset can be performed through on-site manual or remote operation of the monitoring system.

[0062] Through hardware redundancy design, dynamic enabling judgment, two-dimensional detection (single-cycle mutation + multi-cycle slow change), and intelligent reset mechanism, a comprehensive monitoring of the gate opening jump fault of the fast gate in large hydropower stations is realized. This method not only improves the sensitivity and accuracy of detection, but also effectively reduces the false alarm rate and missed alarm rate, and is applicable to scenarios with extremely high safety requirements in water conservancy projects.

[0063] Please refer to Figure 2 and Figure 3 , Figure 2 which shows a logic flowchart of a gate opening jump fault monitoring proposed in an embodiment of the present application, Figure 3 which shows another logic flowchart of a gate opening jump fault monitoring proposed in an embodiment of the present application. There are multiple input signals in the figure, including the opening of the opening and closing valve YV2, the opening of the opening and closing valve YV3, etc. The opening of YV2 (dualization) is represented as YV2', and so on. It is used to represent the states of different valves. The input signals go through a series of logical judgments (such as AND gates, OR gates, etc.). For example, the signal of the opening of the opening and closing valve YV2 and the signal of the opening of the opening and closing valve YV2 (dualization) perform a logical AND operation through an AND gate &. Only when both signals are true, the output is true, and then enter the next step. Set a time delay element TON with a set time of 3 seconds. Only when a specific condition lasts for more than 3 seconds, will the subsequent actions be triggered. The gate code value jump enabling judgment is used to judge whether to allow the detection of the gate code value jump.

[0064] The figure contains multiple alarm mechanisms, including single-cycle jump alarm, multi-cycle jump alarm, etc. The alarm mechanism will be triggered when certain conditions are met, such as the gate opening exceeding a certain threshold, the number of consecutive jumps reaching a certain quantity, etc. The final output signal includes the total alarm of the gate opening jump, etc., which is used to indicate whether there is a jump fault in the system. The on-site manual fault reset and the remote fault reset of the monitoring system are used to re-initialize the system state after the fault is eliminated.

[0065] Step S2 includes:

[0066] When the opening valve YV2 and YV2' or the closing valve YV3 and YV3' act, the gate code value jump enabling judgment is triggered after a preset time delay.

[0067] The gate code value jump enabling judgment is directly triggered in the gate stationary state.

[0068] The gate code value jump enabling judgment is disabled when the quick closing valve YV4 and YV4' act.

[0069] The triggering conditions for the gate code value jump enabling judgment rule are: during the gate action (either YV2 / YV3 acts), after the opening or closing action, delay for 3 seconds → trigger the code value jump enabling judgment; in the gate stationary state (neither YV2 / YV3 acts), directly trigger the code value jump enabling judgment without delay. The disabling condition is: YV4 acts or YV4 acts (dual redundant) → the gate closes quickly, and immediately reset the code value jump enabling judgment.

[0070] Signal redundancy is achieved through dual redundant nodes (YV2', YV3', YV4') to avoid control failure caused by single-point faults. The quick closing of the gate (YV4) has a higher priority than the normal closing of the gate (YV3). When triggered, it directly disables the code value judgment logic. After the opening / closing action, delay for 3 seconds, which may be used to ensure the stability of the gate before monitoring the state.

[0071] The implementation of the PLC program for enabling judgment is as follows:

[0072]

[0073]

[0074] The control signals of the dual redundant valve actuators use an OR logic judgment.

[0075] The triggering conditions of the OR logic are: First, for the opening control, YV2 opens or YV2 opens (dual redundant) → the gate opens; Second, for the closing control, YV3 opens or YV3 opens (dual redundant) → the gate closes normally; Third, for the role of the dual redundant nodes, YV2 dual redundant and YV3 dual redundant are used as redundant signal nodes to ensure that the action can still be triggered when a single node fails.

[0076] The triggering conditions for single-cycle alarm are as follows:

[0077] The enabling judgment of the gate code value jump is true;

[0078] The absolute value of the jump of the opening code value between the current cycle and the previous cycle is greater than 50 code values.

[0079] The triggering logic for the single-cycle jump alarm of the gate opening is: when the enabling judgment of the gate code value jump is triggered, and within a single cycle of the PLC, the absolute value of the jump of the gate opening code value is greater than 50 code values, then the single-cycle jump alarm of the gate opening will be triggered, and at the same time, the jump alarm of the gate opening will also be triggered, ensuring real-time monitoring and alarm of the change of the gate opening when the enabling judgment of the gate code value jump is effective.

[0080] The triggering conditions for multi-cycle alarm are as follows:

[0081] The enabling judgment of the gate code value jump is true;

[0082] The continuously jumping code value of the gate opening in the same direction is greater than 25 code values;

[0083] The number of consecutive jumps of the gate opening in the same direction is greater than 5.

[0084] The triggering logic for the multi-cycle slow change alarm of the gate opening is: when the enabling judgment of the gate code value jump is true, and in the same direction (opening or closing the gate) continuously more than 5 times, and each time the jump of the gate opening is greater than 25 code values, then the multi-cycle slow change alarm of the gate opening will be triggered, and at the same time, the jump alarm of the gate opening will also be triggered, which ensures the monitoring and alarm of the slow change of the gate opening in multiple cycles.

[0085] The implementation of the PLC program for the single-cycle jump alarm logic is as follows:

[0086]

[0087] The implementation of the PLC program for the multi-cycle jump alarm logic is as follows:

[0088]

[0089] The conditions for automatic alarm reset include:

[0090] After the single-cycle or multi-cycle alarm is triggered, the absolute value of the jump of the gate opening is less than 10 code values within 100 consecutive cycles;

[0091] Through on-site manual or remote forced reset instruction of the monitoring system.

[0092] When a single - cycle or multi - cycle alarm is triggered, the alarm will be automatically reset when any of the following conditions is met: First, within 100 consecutive cycles, the absolute value of the gate opening jump is less than 10 code values; Second, a forced reset command sent locally manually or remotely through the monitoring system is received, which ensures that after the abnormal situation is lifted, the alarm can return to the normal state through automatic monitoring or manual intervention.

[0093] The PLC program implementation for automatic alarm reset is as follows:

[0094]

[0095]

[0096] In a possible embodiment, taking the fast - gate system of a large - scale hydropower station as an example, the programmable logic controller (PLC) is used to achieve a full - range monitoring of the gate opening jump fault. Under normal operating conditions, whether the fast - gate is in the static state, opening state, closing state or fast - closing state, the change in the gate opening remains normal, and all alarms are in the reset state. Specifically, when the fast - gate is in the static state, the gate opening can be monitored in real - time. When the encoder code value is forced to be modified to simulate an instantaneous jump in the opening, the "single - cycle gate opening jump alarm" and the "gate opening jump alarm" can act accurately; when the encoder code value is forced to be modified to simulate a continuous jump in the opening during the slow opening or closing state, the "multi - cycle slow change alarm of gate opening" and the "gate opening jump alarm" can also be normally triggered. It should be noted that when the fast - gate is in the fast - closing state, even if the opening jump is simulated, the "single - cycle gate opening jump alarm", the "multi - cycle slow change alarm of gate opening" and the "gate opening jump alarm" all remain in the reset state. In addition, after the alarm is triggered, as long as the code value is kept stable for 1 second, the alarm can be automatically reset.

[0097] Actual tests show that the logic response is rapid, with a response time less than 10 milliseconds, and its threshold parameters (such as 50 code values, 25 code values and 10 code values) can be adjusted according to the specific equipment requirements, featuring high flexibility and good engineering applicability. This characteristic enables it to be widely applied to industrial scenarios with extremely high requirements for the safety of gate control in water conservancy, hydropower, etc. Combined with dynamic enabling, dual - redundant and intelligent reset mechanisms, it not only ensures high reliability but also significantly reduces the false - alarm rate, providing a strong guarantee for the safe operation of related industries.

[0098] In summary, a brand-new method for judging the opening jump fault of the fast gate of a large hydropower station proposed in the embodiments of the present application, through technical means such as multiple detection mechanisms, dual redundant design, dynamic enabling control, intelligent reset mechanism, and anti-interference and fault tolerance capabilities, while ensuring high reliability, effectively reduces the false alarm rate and missed alarm rate, and is applicable to industrial scenarios such as water conservancy and hydropower where strict safety requirements are imposed on gate control.

[0099] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0100] First, sudden changes are captured through single-cycle burst detection to quickly respond to mechanical jams or sensor failures; at the same time, multi-cycle slow change detection identifies slowly accumulating anomalies, such as mechanical wear or control signal drift. The combination of the two achieves full coverage of instantaneous and trend anomalies, significantly improving the sensitivity of opening jump fault detection and solving the problems of high false alarm rate, missed progressive faults, and ambiguous fault types in traditional methods.

[0101] Second, the valve control signals adopt dual nodes, and signal redundancy is ensured through OR logic to avoid misjudgment caused by single-point failure. This design better complies with industrial safety standards and greatly improves the reliability of the system.

[0102] Third, the enabling judgment of the gate code value jump is introduced to dynamically control the detection logic, which is precisely adapted to different working conditions. It is triggered with a 3-second delay after the opening / closing operation to reserve mechanical action time to avoid false alarms caused by normal code value fluctuations; it is directly triggered in the static state to ensure that abnormal jumps can still be monitored without operation; the detection is blocked during fast closing to avoid false alarms caused by opening changes under normal fast closing conditions.

[0103] Fourth, two methods of automatic reset and manual reset are provided: the condition for automatic reset is that the number of jumps is less than 10 code values for 100 consecutive times, ensuring that the system can automatically recover after the fault is eliminated and reducing manual intervention; at the same time, local or remote manual reset channels are provided to meet the flexible control requirements in emergency situations and conform to the actual needs of hierarchical management of industrial systems.

[0104] The following presents a possible implementation of a system for judging the opening jump fault of the fast gate of a large hydropower station, which is used to execute each execution step and corresponding technical effects of a method for judging the opening jump fault of the fast gate of a large hydropower station shown in the above embodiments and possible implementations. The system includes:

[0105] A programmable logic controller for performing jump detection, alarm logic, and reset control;

[0106] A dual valve actuator for opening or closing the opening valves YV2 and YV2', closing valves YV3 and YV3', and fast closing valves YV4 and YV4';

[0107] An absolute displacement encoder is used to feedback the gate opening code value to the programmable logic controller.

[0108] The system further includes:

[0109] A communication interface module is used to connect the programmable logic controller with the power station monitoring system, and upload the single-cycle alarm, multi-cycle alarm, total alarm status and the real-time gate opening code value in real time;

[0110] A fault history database is used to store the time stamp, jump amplitude, associated valve action status and alarm reset records of the jump event, and supports remote query and analysis.

[0111] The communication interface module realizes real-time data interaction with the power station monitoring system through a standardized protocol, ensuring that the operation personnel remotely master the gate status and fault information, and improving the response speed. The fault history database records the detailed parameters of the jump event, provides data support for fault diagnosis, facilitates the analysis of jump rules and the optimization of control strategies, and meets the operation and maintenance audit requirements at the same time. It forms a closed-loop system with the existing PLC, encoder and valve actuator.

[0112] In summary, a method and system for judging the opening jump fault of a fast gate in a large hydropower station disclosed in this application configure the hardware of the gate control system, judge the enabling of the gate code value jump according to the valve action status of the dual-redundancy valve actuator. When the gate opening jumps more than the first threshold within a single PLC scan cycle, a single-cycle alarm and a total alarm are triggered. When the gate opening continuously jumps in the same direction more than the second threshold and the number of times reaches the preset value, a multi-cycle alarm and a total alarm are triggered. After the fault is eliminated, the alarm is automatically reset, and the alarm is reset through continuous stable state detection or manual operation. When the gate is in a normal state, the change of the gate opening is monitored in real time and stably, and the false alarm rate can be significantly reduced, reducing the interference to the operation and maintenance personnel. When a gate opening jump fault occurs, the omission of fault reporting can be effectively prevented, facilitating the maintenance personnel to quickly and accurately locate the fault. After the fault disappears, the fault can be reliably and automatically restored, reducing the impact on the equipment.

[0113] The above are only the preferred embodiments of this application, and are not intended to limit this application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A method for judging the opening jump fault of a quick gate in a large hydropower station, characterized in that, The method includes: Configuring the gate control system hardware, including a programmable logic controller, an absolute displacement encoder, and a dual-valve actuator. The dual-valve actuator includes opening valves YV2 and YV2', closing valves YV3 and YV3', and quick-closing valves YV4 and YV4'; Judging the enabling of gate code value jump according to the valve action state of the dual-valve actuator; When the gate opening jumps by more than the first threshold within a single PLC scan cycle, triggering single-cycle alarm and total alarm; When the gate opening continuously jumps in the same direction by more than the second threshold and the number of jumps reaches the preset value, triggering multi-cycle alarm and total alarm; Performing automatic alarm reset after the fault is eliminated, and restoring the alarm through continuous stable state detection or manual operation.

2. The method for judging the opening jump fault of the fast gate of a large hydropower station according to claim 1, characterized in that, The step of judging the enabling of gate code value jump according to the valve action state of the dual-valve actuator includes: When the opening valves YV2 and YV2' or the closing valves YV3 and YV3' act, triggering the judgment of the enabling of gate code value jump after a preset time delay; Directly triggering the judgment of the enabling of gate code value jump in the gate stationary state; Disabling the judgment of the enabling of gate code value jump when the quick-closing valves YV4 and YV4' act.

3. The method for judging the opening jump fault of the quick gate of a large hydropower station according to claim 1, characterized in that The control signals of the dual-valve actuator adopt OR logic judgment.

4. The method for judging the opening jump fault of the quick gate of a large hydropower station according to claim 1, characterized in that, The triggering condition of the single-cycle alarm is: The judgment of the enabling of gate code value jump is true; The absolute value of the jump of the opening code value between the current cycle and the previous cycle is greater than 50 code values.

5. The method for judging the opening jump fault of the fast gate of a large hydropower station according to claim 1, wherein The triggering condition of the multi-cycle alarm is: The judgment of the enabling of gate code value jump is true; The continuously jumped code value of the gate opening in the same direction is greater than 25 code values; The number of continuous jumps of the gate opening in the same direction is greater than 5.

6. The method for judging the opening sudden change fault of the quick gate of a large hydropower station according to claim 1, characterized in that, The conditions for automatic alarm reset include: After the single-cycle or multi-cycle alarm is triggered, the absolute value of the jump of the gate opening is less than 10 code values within 100 consecutive cycles; Through on-site manual or remote forced reset instruction of the monitoring system.

7. The method for judging the opening jump fault of the quick gate of a large hydropower station according to claim 1, characterized in that, The resolution of the absolute displacement encoder is 0.1 mm, and the code value range is 0 to 10,000.

8. The method for judging the opening jump fault of the quick gate of a large hydropower station according to claim 1, characterized in that, The scan cycle of the programmable logic controller is in milliseconds, and the single-cycle jump detection is based on the scan cycle of the programmable logic controller as the reference time unit.

9. A rapid gate opening jump fault judgment system for a large hydropower station, characterized in that, The system includes: A programmable logic controller for performing jump detection, alarm logic, and reset control; A dual-valve actuator for opening or closing the opening valves YV2 and YV2', the closing valves YV3 and YV3', and the quick-closing valves YV4 and YV4'; An absolute displacement encoder for feeding back the gate opening code value to the programmable logic controller.

10. The large hydropower station quick gate opening jump fault judgment system according to claim 9, characterized in that, The system further includes: A communication interface module for connecting the programmable logic controller with the power station monitoring system and uploading the single-cycle alarm, multi-cycle alarm, total alarm status, and real-time gate opening code value in real time; A fault history database for storing the time stamp, jump amplitude, associated valve action state, and alarm reset record of the jump event, and supporting remote query and analysis.

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