A method, system, equipment and medium for precise calculation of water head of hydropower station and unit

Abstract

The present invention discloses a method, system, device, and medium for fine-grained calculation of hydraulic heads for hydropower stations and units, belonging to the technical field of hydraulic head calculation for hydropower stations and units. The method comprises: obtaining liquid level values ​​for various state monitoring of the hydropower station; designing a logic strategy for determining effectiveness; calculating the difference between the effective hydraulic levels of the hydropower station to obtain the effective hydraulic head of the hydropower station; calculating the gross hydraulic head of each unit to obtain the effective hydraulic head of each unit; and designing and implementing the locking and unlocking logic and alarm mechanism for the effective hydraulic head of the hydropower station and the effective hydraulic head of each unit, respectively, to ensure the safe and stable operation of the hydropower station. The present invention improves the reliability of hydraulic head calculation and lays a good technical foundation for fine-grained economic optimization and dispatching operations within hydropower stations.

Description

Technical Field

[0001] The present invention relates to the technical field of water head calculation for hydropower stations and units, and in particular to a method, system, equipment and medium for fine water head calculation for hydropower stations and units. Background Art

[0002] During the operation of a hydropower unit, the water head of the power station and the unit is a key factor affecting the unit's operation and power generation. It determines important indicators such as the unit's operating range and operating efficiency. However, the current calculation of the water head of the power station and the unit has the following main problems:

[0003] (1) The calculation of hydraulic head mainly depends on the difference between upstream and downstream water levels. However, the selection of upstream and downstream water levels at different points will have a great impact on the accuracy of hydraulic head of power stations and units. In the past, the selection of upstream and downstream water levels in calculating hydraulic head of power stations and units ignored the impact of some local hydraulic losses on hydraulic head. In addition, the impact of upstream and downstream water level fluctuations on hydraulic head caused by water flow fluctuations caused by wind power and unit power generation was ignored.

[0004] (2) Currently, upstream and downstream water levels are directly measured using a single sensor, resulting in low accuracy and reliability of water level data, leading to large errors in head calculations. Furthermore, sensors are susceptible to interference in complex environments, leading to large measurement errors. When a sensor fails, the deviation in the measurement data becomes even greater, seriously affecting the accuracy of head calculations and even causing a long-term lack of head.

[0005] (3) Due to water level fluctuations and sensor instability, the monitoring system may frequently receive erroneous or fluctuating data, causing the monitoring briefing to refresh the screen, affecting the operator's accurate judgment of the actual water level and head.

[0006] (4) The single sensor measurement method lacks comprehensive processing and reliability judgment of multi-source data, and cannot effectively eliminate abnormal data and improve measurement accuracy. The above factors have seriously affected the efficient and stable operation of hydropower units. Summary of the Invention

[0007] In view of the above existing problems, the present invention is proposed.

[0008] Therefore, the present invention provides a method, system, equipment and medium for fine calculation of water head of a hydropower station and a unit to solve the problem that the existing water head calculation method has low accuracy and poor reliability, which affects the operating efficiency and stability of the unit.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0010] In a first aspect, the present invention provides a method for finely calculating the water head of a hydropower station and a unit, comprising:

[0011] Obtaining various status monitoring liquid level values ​​of the hydropower station; the various status monitoring liquid level values ​​include the liquid level before the trash rack, the liquid level after the tailwater gate, the liquid level after the rapid gate, and the liquid level before the tailwater gate;

[0012] Design a validity determination logic strategy based on the filtered monitoring level values ​​of each state;

[0013] Based on the monitoring level values ​​of each state after validity determination, the effective water head of the power station is obtained by calculating the difference of the effective liquid level of the power station;

[0014] Based on the liquid level values ​​of each state monitoring after effectiveness determination, the effective water head of each unit is obtained by calculating the gross water head of each unit;

[0015] Based on the effective water head of the power station and the effective water head of each unit, the locking and unlocking logic as well as the alarm mechanism of the effective water head of the power station and the effective water head of each unit are designed and implemented respectively to ensure the safe and stable operation of the power station.

[0016] As a preferred solution of the method for finely calculating the water head of a hydropower station and a unit according to the present invention, wherein:

[0017] The filtering process includes using a non-local mean filtering algorithm to filter the acquired state monitoring liquid level values ​​and store them in a database.

[0018] As a preferred solution of the method for fine head calculation of a hydropower station and a unit according to the present invention, the design validity determination logic strategy includes:

[0019] If the difference between the newly collected state monitoring liquid level value and the previous valid liquid level value does not exceed the set threshold, the newly collected state monitoring liquid level value is considered to be valid data;

[0020] If the difference between the newly collected state monitoring liquid level value and the previous valid liquid level value exceeds the set threshold, the newly collected state monitoring liquid level value is considered to have an abnormal jump and is marked as invalid data;

[0021] If the liquid level channel used to calculate the status monitoring liquid level value fails, or each status monitoring liquid level value exceeds the preset range, or an abnormal jump occurs, the corresponding status monitoring liquid level value will be locked;

[0022] If the abnormal jump situation is eliminated, the corresponding status monitoring liquid level value will be automatically unlocked;

[0023] If the level channel for calculating the status monitoring level value fails and the situation where the status monitoring level value exceeds the preset range is eliminated, a manual unlocking operation is performed;

[0024] If the liquid level value of each state monitoring exceeds the set safety range, an over-limit alarm will be triggered;

[0025] Compare the current monitoring level value of each state with the average value within 20 scanning cycles. If the difference exceeds the set mutation threshold, the water level mutation alarm in front of the trash rack will be triggered;

[0026] The monitoring level values ​​of each state at the preset time point are compared with the current monitoring level values ​​of each state. If the difference exceeds the set slow change threshold, the water head slow change alarm is triggered.

[0027] As a preferred solution of the method for finely calculating the water head of a hydropower station and a unit according to the present invention, the method of obtaining the effective water head of the hydropower station includes:

[0028] The effective liquid level before the trash rack of the power station is obtained by calculating the average value of the effective liquid level before the trash rack of the unlocked units.

[0029] The effective liquid level behind the tailwater gate of the power station is obtained by calculating the average of the effective liquid level behind the tailwater gate of the unlocked units;

[0030] The effective water head of the power station is obtained by calculating the difference between the effective liquid level before the power station trash rack and the effective liquid level after the tailwater gate.

[0031] As a preferred solution of the method for finely calculating the water head of a hydropower station and a unit according to the present invention, the method of obtaining the effective water head of each unit includes:

[0032] After filtering and determining the effectiveness of the liquid level data behind the rapid gate, the effective liquid level behind the rapid gate of each unit is obtained;

[0033] After filtering and determining the effectiveness of the tailwater gate liquid level data, the effective liquid level in front of the tailwater gate of each unit is obtained;

[0034] The gross water head of each unit is obtained by calculating the difference between the effective liquid level after the rapid gate and the effective liquid level before the tailwater gate;

[0035] The effective water head of each unit is obtained by averaging the gross water head data of the previous 10 times.

[0036] As a preferred solution of the method for finely calculating the water head of a hydropower station and a unit according to the present invention, the locking and unlocking logic and alarm mechanism of the effective water head of the power station include:

[0037] If the liquid level channel used to calculate the effective water head of the power station fails, or the effective water head of the power station exceeds the preset range, or the effective water head of the power station changes beyond the limit, the current effective water head of the power station will be locked;

[0038] If the change in the effective water head of the power station exceeds the limit, the current effective water head of the power station will be automatically unlocked;

[0039] If the liquid level channel for calculating the effective water head of the power station fails and the situation that the effective water head of the power station exceeds the preset range is eliminated, the manual unlocking operation is performed;

[0040] If the effective water head of the power station exceeds the set safety range, an over-limit alarm will be triggered;

[0041] Compare the current effective water head of the power station with the average water head value within 20 scanning cycles. If the difference exceeds the set mutation threshold, a mutation alarm is triggered.

[0042] The effective water head of the power station at the preset time point is compared with the current effective water head of the power station. If the difference exceeds the set slow change threshold, the water head slow change alarm is triggered.

[0043] As a preferred solution of the method for finely calculating the hydraulic head of a hydropower station and a unit according to the present invention, the locking and unlocking logic and alarm mechanism of the effective hydraulic head of each unit include:

[0044] If the liquid level channel used to calculate the effective water head of each unit fails, or the effective water head of the unit exceeds the preset range, or the effective water head of the unit changes beyond the limit, the effective water head of the current unit will be locked;

[0045] If the situation where the effective water head of the unit exceeds the limit is eliminated, the current effective water head of the unit will be automatically unlocked;

[0046] If the liquid level channel for calculating the effective water head of each unit fails and the situation that the effective water head of the unit exceeds the preset range is eliminated, the manual unlocking operation is performed;

[0047] If the effective water head of the unit exceeds the set safety range, an over-limit alarm will be triggered;

[0048] Compare the current effective water head of the unit with the average water head value within 20 scanning cycles. If the difference exceeds the set mutation threshold, the water level mutation alarm in front of the trash rack will be triggered.

[0049] The effective water head of the unit at the preset time point is compared with the current effective water head of the unit. If the difference exceeds the set slow change threshold, the water head slow change alarm is triggered.

[0050] In a second aspect, the present invention provides a hydropower station and unit head precision calculation system, comprising:

[0051] An acquisition module is used to obtain the liquid level values ​​of various status monitoring of the hydropower station; the liquid level values ​​of various status monitoring include the liquid level before the trash rack, the liquid level after the tailwater gate, the liquid level after the fast gate, and the liquid level before the tailwater gate;

[0052] The validity determination module is used to design the validity determination logic strategy based on the filtered state monitoring liquid level values;

[0053] The power station effective water head calculation module is used to obtain the effective water head of the power station by calculating the difference between the effective liquid levels of the power station based on the liquid level values ​​of each state monitoring after the effectiveness judgment;

[0054] The unit effective water head calculation module is used to calculate the gross water head of each unit based on the liquid level value of each state after the effectiveness judgment, and obtain the effective water head of each unit;

[0055] The water head abnormality control and alarm module is used to design and implement the locking and unlocking logic and alarm mechanism of the effective water head of the power station and the effective water head of each unit based on the effective water head of the power station and the effective water head of each unit, so as to ensure the safe and stable operation of the power station.

[0056] In a third aspect, the present invention provides an electronic device, comprising:

[0057] Memory, used to store programs;

[0058] The processor is used to execute the computer executable instructions, which, when executed by the processor, implement the steps of the method for fine calculation of the water head of a hydropower station and a unit.

[0059] In a fourth aspect, the present invention provides a computer-readable storage medium, comprising: when the program is executed by a processor, the steps of implementing the method for fine calculation of the water head of a hydropower station and a unit are implemented.

[0060] Beneficial effects of the present invention: The present invention not only takes into account the data of a single sensor, but also combines the liquid level information of multiple key positions such as in front of the trash rack and before and after the tailwater gate, which more accurately reflects the actual working conditions of the hydropower station and improves the accuracy of the head calculation; designs detailed validity judgment logic for each state monitoring liquid level value to ensure that only valid data is used for subsequent calculations; designs detailed locking, unlocking and alarm logic strategies for the state monitoring liquid level value, the effective head of the power station and the head of the unit; significantly improves the accuracy and reliability of the head calculation of the hydropower station and its units, and also enhances the stability and safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0062] Figure 1 A schematic diagram of the basic flow of a method for fine head calculation of a hydropower station and a unit provided by one embodiment of the present invention;

[0063] Figure 2 A schematic diagram of a liquid level monitoring arrangement for a hydropower station and a unit, providing a method for fine head calculation for a hydropower station and a unit according to one embodiment of the present invention;

[0064] Figure 3 A diagram of the liquid level in front of the trash rack of a hydropower station unit provided by an embodiment of the present invention for a method for finely calculating the water head of a hydropower station and a unit;

[0065] Figure 4 An effective liquid level diagram in front of the trash rack of a hydropower station unit provided by an embodiment of the present invention for a method for finely calculating the water head of a hydropower station and a unit;

[0066] Figure 5 A diagram of the liquid level behind the tailwater gate of a hydropower station unit provided by an embodiment of the present invention for a method for finely calculating the water head of a hydropower station and a unit;

[0067] Figure 6 An effective liquid level diagram behind the tailwater gate of a hydropower station and a unit head precision calculation method provided by one embodiment of the present invention;

[0068] Figure 7 An effective water head diagram of a hydropower station and a method for fine water head calculation of a unit provided by one embodiment of the present invention;

[0069] Figure 8 A diagram of the liquid level behind the rapid gate of a hydropower station unit provided by an embodiment of the present invention for a method for finely calculating the water head of a hydropower station and a unit;

[0070] Figure 9 A liquid level map in front of the tailwater gate of a hydropower station and a unit provided by an embodiment of the present invention;

[0071] Figure 10 A unit gross head diagram for a hydropower station and a unit head fine calculation method provided by one embodiment of the present invention;

[0072] Figure 11 An effective head diagram of a hydropower station and a unit head fine calculation method provided by one embodiment of the present invention;

[0073] Figure 12 This is a system display screen diagram of a method for fine head calculation of a hydropower station and a unit provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0074] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0075] Example 1, reference Figure 1 , which is an embodiment of the present invention, provides a method for fine calculation of water head of a hydropower station and a unit, comprising:

[0076] S100: Acquire various status monitoring liquid level values ​​of the hydropower station; the various status monitoring liquid level values ​​include the liquid level before the trash rack, the liquid level after the tailwater gate, the liquid level after the rapid gate, and the liquid level before the tailwater gate;

[0077] S200: Designing a validity determination logic strategy based on the filtered state monitoring liquid level values;

[0078] S300: Based on the liquid level values ​​of each state monitoring after the effectiveness determination, the effective water head of the power station is obtained by calculating the difference of the effective liquid level of the power station;

[0079] S400: Based on the liquid level values ​​of each state monitoring after the effectiveness determination, the gross water head of each unit is calculated to obtain the effective water head of each unit;

[0080] S500: Based on the effective water head of the power plant and the effective water head of each unit, the locking and unlocking logic and alarm mechanism of the effective water head of the power plant and the effective water head of each unit are designed and implemented to ensure the safe and stable operation of the power plant.

[0081] It should be noted that during hydropower unit operation, accurate calculation of hydraulic head at the power plant and turbine units faces a series of challenges, including accuracy issues caused by selecting different upstream and downstream water levels, insufficient accuracy and reliability of single sensor measurement data, the impact of environmental factors such as wind and current fluctuations on water levels, and errors caused by sensor failure. These issues can lead to frequent erroneous or fluctuating data being received by the monitoring system, affecting operators' accurate judgment of actual water levels and hydraulic head. Furthermore, there is a lack of comprehensive processing capabilities for multi-source data to improve measurement accuracy. As a key factor affecting unit operation and power generation, hydraulic head at the power plant and turbine units not only determines important indicators such as the unit's operating range and efficiency, but also directly affects the safe and stable operation of the hydropower station. Accurate hydraulic head calculation helps optimize unit operating conditions and improve power generation efficiency, while also ensuring equipment safety and avoiding potential risks caused by inaccurate hydraulic head calculations. Therefore, addressing these challenges is crucial to improving the overall performance of hydropower plants.

[0082] Therefore, in order to address the problems of low accuracy and poor reliability of the existing head calculation method, which affects the operating efficiency and stability of the unit, the accuracy of the head calculation is improved through steps S100-S500 by fully considering the hydraulic loss characteristics of the upstream and downstream. In addition, the upstream and downstream representative water levels are obtained at multiple points, and the validity judgment, locking, unlocking and alarm logic are designed to improve the reliability of the head calculation, laying a good technical foundation for the fine economic optimization scheduling and operation within the hydropower station.

[0083] Example 2, which is an embodiment of the present invention, provides a method for finely calculating the water head of a hydropower station and a unit based on the previous embodiment, including:

[0084] In an embodiment of the present invention, obtaining the real-time status monitoring data of each liquid level of the hydropower station in step S100 includes obtaining the liquid level in front of the trash rack of each unit, the liquid level behind the tailwater gate, the liquid level behind the rapid gate, and the liquid level in front of the tailwater gate from the computer monitoring system of the hydropower station.

[0085] In the embodiment of the present invention, the filtering of each state monitoring liquid level value in step S200 includes filtering each state monitoring liquid level value obtained by using a non-local means filtering (NLM) algorithm and storing the filtered values ​​in a database.

[0086] In the embodiment of the present invention, the validity determination logic strategy is designed in step S200, including:

[0087] If the difference between the newly collected state monitoring liquid level value and the previous valid liquid level value does not exceed the set threshold (1.5 meters), the newly collected state monitoring liquid level value is considered to be valid data;

[0088] If the difference between the newly collected state monitoring liquid level value and the previous valid liquid level value exceeds the set threshold (1.5 meters), the newly collected state monitoring liquid level value is considered to have jumped and is marked as invalid data. The state monitoring liquid level values ​​at the current moment are discarded and do not participate in the average calculation.

[0089] The current effective liquid level for state monitoring is calculated using a sliding window averaging technique. If the currently collected liquid level does not experience an abnormal jump (i.e., the difference does not exceed 1.5 meters), the current effective liquid level for each state monitoring session = (the sum of the previous 9 effective liquid levels + the currently collected effective liquid level) / 10. If the currently collected liquid level does experience a jump (i.e., the difference exceeds 1.5 meters), the current effective liquid level for each state monitoring session = (the sum of the previous 10 effective liquid levels) / 10. If the current level does not experience an abnormal jump, the currently collected value is added to the historical data queue, and the oldest record is removed, retaining the most recent 10 valid data. If the current level does experience an abnormal jump, the historical data queue is not updated, and the previous 10 valid liquid levels are used for the next round of calculations.

[0090] If the level channel used to calculate the status monitoring level fails, or if any of the status monitoring level values ​​exceeds a preset range (such as the minimum / maximum operating water level), or if an abnormal jump occurs, the current level will be marked as "invalid" and the level data will no longer be used for any control, scheduling, or head calculations. The system will enter a locked state and wait for unlocking. Failures in the level channel used to calculate the status monitoring level value include loss of level sensor signal or disconnection, which can result in the inability to obtain valid data.

[0091] If the abnormal jump situation is eliminated, the corresponding status monitoring liquid level value will be automatically unlocked;

[0092] If the level channel for calculating the status monitoring level value fails and the situation where the status monitoring level value exceeds the preset range is eliminated, a manual unlocking operation is performed;

[0093] If any of the above three types of locks occur, it can be forced to unlock through manual intervention, but it must be executed after the system prompts or confirms that there are no safety hazards.

[0094] When the liquid level value of each state monitoring exceeds the set safety range, an over-limit alarm is triggered;

[0095] In the embodiment of the present invention, the sudden change alarm includes comparing the latest state monitoring liquid level value received by the local control unit (LCU) with the average value of the state monitoring liquid level values ​​within 20 scanning cycles. If the value is greater than 1.5m, the sudden change alarm of the water level in front of the trash rack is triggered;

[0096] In the embodiment of the present invention, the slow-change alarm includes taking the difference between the state monitoring liquid level value issued three minutes ago and the current state monitoring liquid level value. If the difference is greater than 1.5m, the water head slow-change alarm is triggered.

[0097] In the embodiment of the present invention, obtaining the effective water head of the power station in step S300 includes:

[0098] The effective liquid level before the trash rack of the power station is obtained by calculating the average value of the effective liquid level before the trash rack of the unlocked units.

[0099] The effective liquid level behind the tailwater gate of the power station is obtained by calculating the average of the effective liquid level behind the tailwater gate of the unlocked units;

[0100] The effective water head of the power station is obtained by calculating the difference between the effective liquid level before the power station trash rack and the effective liquid level after the tailwater gate.

[0101] In the embodiment of the present invention, obtaining the effective water head of each unit in step S400 includes:

[0102] After filtering and determining the effectiveness of the liquid level data behind the rapid gate, the effective liquid level behind the rapid gate of each unit is obtained;

[0103] After filtering and determining the effectiveness of the tailwater gate liquid level data, the effective liquid level in front of the tailwater gate of each unit is obtained;

[0104] The gross water head of each unit is obtained by calculating the difference between the effective liquid level after the rapid gate and the effective liquid level before the tailwater gate;

[0105] The effective water head of each unit is obtained by averaging the gross water head data of the previous 10 times.

[0106] In this embodiment of the present invention, the effective head of each unit is calculated using a sliding average algorithm based on the 10 most recently collected gross head data. If a change in gross head of a unit at a given moment exceeds 3 meters compared to the previous moment, it is considered an abnormal jump, and the data is discarded and not included in the calculation. Under normal circumstances, the current unit effective head = (the sum of the previous 9 effective gross heads + the currently collected effective gross head) / 10. If a jump occurs, a conservative strategy is adopted: the current unit effective head = (the sum of the previous 10 effective gross heads) / 10.

[0107] The unit's gross head data is collected once per second and used to update the effective head value in real time.

[0108] In an embodiment of the present invention, the locking and unlocking logic and alarm mechanism of the effective water head of the power station in step S500 include:

[0109] If the liquid level channel used to calculate the effective water head of the power station fails, or the effective water head of the power station exceeds the preset range, or the effective water head of the power station changes beyond the limit, the current effective water head of the power station will be locked;

[0110] When the change of the effective water head of the power station exceeds the limit, the current effective water head of the power station is automatically unlocked;

[0111] When the level channel for calculating the effective water head of the power station fails and the effective water head of the power station exceeds the preset range, manual intervention is required to unlock;

[0112] When the effective water head of the power station exceeds the set safety range, an over-limit alarm is triggered;

[0113] Compare the current effective water head of the power station with the average value within 20 scanning cycles. If the difference exceeds the set mutation threshold (3 meters), a mutation alarm is triggered;

[0114] The effective water head of the power station at the preset time point (three minutes ago) is compared with the effective water head of the power station at the current moment. If the difference exceeds the set slow change threshold (3 meters), the water head slow change alarm is triggered.

[0115] In this embodiment of the present invention, an effective water level channel failure includes an anomaly (e.g., disconnection, signal loss, etc.) in the liquid level collection channel before the trash rack or after the tailwater gate, resulting in unreliable data. A power plant effective head exceeding a limit occurs when the currently calculated power plant effective head exceeds a preset upper or lower limit (for example, falling below the minimum generating head or exceeding the maximum safe head). A power plant effective head variation exceeding a limit occurs when the difference between the current head value and the previous value exceeds a set threshold (3 meters), indicating a sudden change or abnormal fluctuation.

[0116] In an embodiment of the present invention, the locking and unlocking logic and alarm mechanism of the effective water head of each unit in step S500 include:

[0117] If the liquid level channel used to calculate the effective water head of each unit fails, or the effective water head of the unit exceeds the preset range, or the effective water head of the unit changes beyond the limit, the effective water head of the current unit will be locked;

[0118] When the situation where the effective water head of the unit exceeds the limit is eliminated, the current effective water head of the unit is automatically unlocked;

[0119] When the liquid level channel for calculating the effective water head of each unit fails and the effective water head of the unit exceeds the preset range, manual intervention is required to unlock;

[0120] When the effective water head of the unit exceeds the set safety range, an over-limit alarm is triggered;

[0121] Compare the current effective water head of the unit with the average value within 20 scanning cycles. If the difference exceeds the set mutation threshold, the water level mutation alarm in front of the trash rack will be triggered;

[0122] Compare the effective water head of the unit at the preset time point (three minutes ago) with the effective water head of the unit at the current moment. If the difference exceeds the set slow change threshold, the water head slow change alarm is triggered.

[0123] In this embodiment of the present invention, a water level channel failure includes a fault in the liquid level collection channel before the trash rack or tailwater gate (e.g., a disconnection, signal loss, etc.), which triggers a lockout and marks the current unit head value as invalid. A unit effective head exceeding a limit includes a lockout if the currently calculated unit effective head exceeds a preset upper and lower safety limit (e.g., below the minimum generating head or exceeding the maximum safe head), preventing abnormal head from participating in control decisions. A unit effective head change exceeding a limit includes a lockout if the difference between the current unit effective head and the previous one exceeds a set threshold (3 meters), identifying the risk of sudden fluctuations. A unit head sudden change alarm includes a sudden change alarm if the difference between the latest unit effective head value received by the LCU and the average value over the past 20 scan cycles exceeds a set threshold (3 meters), identifying sudden head anomalies and preventing miscontrol or equipment damage. The unit's head slow change alarm includes triggering a slow change alarm if the difference between the unit's effective head value at the current moment and the head value three minutes ago is greater than the set threshold (3m), detecting abnormal trends of slow changes and providing early warning of potential risks.

[0124] Example 3, reference Figure 2-Figure 12 , is an embodiment of the present invention, which provides a method for fine calculation of the water head of a hydropower station and a unit. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through specific implementation methods and implementation effects.

[0125] The specific details of this embodiment are as follows:

[0126] Taking a domestic hydropower station as an example, the SSK231-R2CDN150 / 6P1B112L75m immersion liquid level transmitter is selected to measure the liquid level in front of the trash racks of the four units of the power station, the SSK231-R2CDN150 / 6P1B112L65m immersion liquid level transmitter is selected to measure the liquid level in front of and after the tailwater gates of the two tailwater tunnels of the power station, and the SSK231-R2CDN150 / 6P1B112L95m immersion liquid level transmitter is selected to measure the liquid level after the rapid gates of the four units of the power station.

[0127] Step 1: If Figure 2 As shown, the programmable controller (PLC) is used to collect and process the liquid level in real time, perform noise reduction on the state collected liquid level, judge the validity of the state liquid level, and store the state collected liquid level.

[0128] Step 2: Obtain the liquid level before the trash rack and after the tailwater gate of each unit, as follows: Figure 3 、 Figure 4 As shown in the figure, the effective liquid level before the power station trash rack and after the tailwater gate is further calculated, and the effective water head of the power station is calculated as follows: Figure 5 、 Figure 6 and Figure 7 shown.

[0129] Step 3: Obtain the liquid level behind the rapid gate and before the tailwater gate of each unit, as follows Figure 8 、 Figure 9 As shown, the gross head and effective head of each unit are further calculated as follows: Figure 10 、 Figure 11 shown.

[0130] Step 4: Develop a refined calculation system for the water head of a hydropower station and units, and realize the functions of determining, displaying, locking, unlocking, and warning the liquid level of the power station and the water head of the power station and units. The system interface is as follows: Figure 12 shown.

[0131] Example 4 is an embodiment of the present invention. This embodiment is different from the first embodiment in that it provides a precise calculation system for the water head of a hydropower station and a unit.

[0132] It should be noted that the technical solution of the hydropower station and unit head fine calculation system and the technical solution of the above-mentioned hydropower station and unit head fine calculation method belong to the same concept. For details not described in detail in the technical solution of the hydropower station and unit head fine calculation system in this embodiment, please refer to the description of the technical solution of the above-mentioned hydropower station and unit head fine calculation method.

[0133] In this embodiment, a hydropower station and unit head precision calculation system includes:

[0134] Acquisition module, used to obtain the liquid level values ​​of various status monitoring of the hydropower station;

[0135] The validity determination module is used to design the validity determination logic strategy based on the filtered state monitoring liquid level values;

[0136] The power station effective water head calculation module is used to obtain the effective water head of the power station by calculating the difference between the effective liquid levels of the power station based on the liquid level values ​​of each state monitoring after the effectiveness judgment;

[0137] The unit effective water head calculation module is used to calculate the gross water head of each unit based on the liquid level value of each state after the effectiveness judgment, and obtain the effective water head of each unit;

[0138] The water head abnormality control and alarm module is used to design and implement the locking and unlocking logic and alarm mechanism of the effective water head of the power station and the effective water head of each unit based on the effective water head of the power station and the effective water head of each unit, so as to ensure the safe and stable operation of the power station.

[0139] This embodiment further provides an electronic device applicable to a method for finely calculating the water head of a hydropower station and a unit, including:

[0140] Memory and processor; the memory is used to store computer-executable instructions, and the processor is used to execute computer-executable instructions to implement a method for fine calculation of the head of a hydropower station and a unit as proposed in the above embodiment.

[0141] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, a method for finely calculating the water head of a hydropower station and a unit is implemented as proposed in the above embodiment.

[0142] The storage medium proposed in this embodiment and the method for realizing a fine calculation of the head of a hydropower station and a unit proposed in the above embodiment belong to the same inventive concept. The technical details not described in detail in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0143] From the above description of the embodiments, those skilled in the art will clearly understand that the present invention can be implemented using software and necessary general-purpose hardware. Of course, it can also be implemented using hardware, but in many cases the former is the preferred embodiment. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, can be embodied in the form of a software product. This software product can be stored on a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk, or optical disk, and includes instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods of various embodiments of the present invention.

[0144] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for calculating the water head of a hydropower station and a unit, characterized in that: include: Obtaining various status monitoring liquid level values ​​of the hydropower station; the various status monitoring liquid level values ​​include the liquid level before the trash rack, the liquid level after the tailwater gate, the liquid level after the rapid gate, and the liquid level before the tailwater gate; Design a validity determination logic strategy based on the filtered monitoring level values ​​of each state; Based on the monitoring level values ​​of each state after validity determination, the effective water head of the power station is obtained by calculating the difference of the effective liquid level of the power station; Based on the liquid level values ​​of each state monitoring after effectiveness determination, the effective water head of each unit is obtained by calculating the gross water head of each unit; Based on the effective water head of the power station and the effective water head of each unit, the locking and unlocking logic and alarm mechanism of the effective water head of the power station and the effective water head of each unit are designed and implemented to ensure the safe and stable operation of the power station; The obtaining of the effective water head of the power station includes: The effective liquid level before the trash rack of the power station is obtained by calculating the average value of the effective liquid level before the trash rack of the unlocked units. The effective liquid level behind the tailwater gate of the power station is obtained by calculating the average of the effective liquid level behind the tailwater gate of the unlocked units; The effective water head of the power station is obtained by calculating the difference between the effective liquid level before the power station trash rack and the effective liquid level after the tailwater gate; The method of obtaining the effective water head of each unit includes: After filtering and determining the effectiveness of the liquid level data behind the rapid gate, the effective liquid level behind the rapid gate of each unit is obtained; After filtering and determining the effectiveness of the tailwater gate liquid level data, the effective liquid level in front of the tailwater gate of each unit is obtained; The gross water head of each unit is obtained by calculating the difference between the effective liquid level after the rapid gate and the effective liquid level before the tailwater gate; The effective water head of each unit is obtained by averaging the gross water head data of the previous 10 times.

2. A method for calculating the water head of a hydropower station and a unit according to claim 1, characterized in that: The filtering process includes using a non-local mean filtering algorithm to filter the acquired state monitoring liquid level values ​​and store them in a database.

3. A method for calculating the water head of a hydropower station and a unit according to claim 2, characterized in that: The design validity determination logic strategy includes: If the difference between the newly collected state monitoring liquid level value and the previous valid liquid level value does not exceed the set threshold, the newly collected state monitoring liquid level value is considered to be valid data; If the difference between the newly collected state monitoring liquid level value and the previous valid liquid level value exceeds the set threshold, the newly collected state monitoring liquid level value is considered to have an abnormal jump and is marked as invalid data; If the liquid level channel used to calculate the status monitoring liquid level value fails, or each status monitoring liquid level value exceeds the preset range, or an abnormal jump occurs, the corresponding status monitoring liquid level value will be locked; If the abnormal jump situation is eliminated, the corresponding status monitoring liquid level value will be automatically unlocked; If the level channel for calculating the status monitoring level value fails and the situation where the status monitoring level value exceeds the preset range is eliminated, a manual unlocking operation is performed; If the liquid level value of each state monitoring exceeds the set safety range, an over-limit alarm will be triggered; Compare the current monitoring level value of each state with the average value within 20 scanning cycles. If the difference exceeds the set mutation threshold, the water level mutation alarm in front of the trash rack will be triggered; The monitoring level values ​​of each state at the preset time point are compared with the current monitoring level values ​​of each state. If the difference exceeds the set slow change threshold, the water head slow change alarm is triggered.

4. A method for calculating the water head of a hydropower station and a unit according to claim 3, characterized in that: The locking and unlocking logic and alarm mechanism of the effective water head of the power station include: If the liquid level channel used to calculate the effective water head of the power station fails, or the effective water head of the power station exceeds the preset range, or the effective water head of the power station changes beyond the limit, the current effective water head of the power station will be locked; If the change in the effective water head of the power station exceeds the limit, the current effective water head of the power station will be automatically unlocked; If the liquid level channel for calculating the effective water head of the power station fails and the situation that the effective water head of the power station exceeds the preset range is eliminated, the manual unlocking operation is performed; If the effective water head of the power station exceeds the set safety range, an over-limit alarm will be triggered; Compare the current effective water head of the power station with the average water head value within 20 scanning cycles. If the difference exceeds the set mutation threshold, a mutation alarm is triggered. The effective water head of the power station at the preset time point is compared with the current effective water head of the power station. If the difference exceeds the set slow change threshold, the water head slow change alarm is triggered.

5. A method for calculating the water head of a hydropower station and a unit according to claim 4, characterized in that: The locking and unlocking logic and alarm mechanism of the effective water head of each unit include: If the liquid level channel used to calculate the effective water head of each unit fails, or the effective water head of the unit exceeds the preset range, or the effective water head of the unit changes beyond the limit, the effective water head of the current unit will be locked; If the situation where the effective water head of the unit exceeds the limit is eliminated, the current effective water head of the unit will be automatically unlocked; If the liquid level channel for calculating the effective water head of each unit fails and the situation that the effective water head of the unit exceeds the preset range is eliminated, the manual unlocking operation is performed; If the effective water head of the unit exceeds the set safety range, an over-limit alarm will be triggered; Compare the current effective water head of the unit with the average water head value within 20 scanning cycles. If the difference exceeds the set mutation threshold, the water level mutation alarm in front of the trash rack will be triggered. The effective water head of the unit at the preset time point is compared with the current effective water head of the unit. If the difference exceeds the set slow change threshold, the water head slow change alarm is triggered.

6. A hydropower station and unit head precision calculation system, using a hydropower station and unit head precision calculation method according to any one of claims 1 to 5, characterized in that: include: An acquisition module is used to obtain the liquid level values ​​of various status monitoring of the hydropower station; the liquid level values ​​of various status monitoring include the liquid level before the trash rack, the liquid level after the tailwater gate, the liquid level after the fast gate, and the liquid level before the tailwater gate; The validity determination module is used to design the validity determination logic strategy based on the filtered state monitoring liquid level values; The power station effective water head calculation module is used to obtain the effective water head of the power station by calculating the difference between the effective liquid levels of the power station based on the liquid level values ​​of each state monitoring after the effectiveness judgment; The unit effective water head calculation module is used to calculate the gross water head of each unit based on the liquid level value of each state after the effectiveness judgment, and obtain the effective water head of each unit; The water head abnormality control and alarm module is used to design and implement the locking and unlocking logic and alarm mechanism of the effective water head of the power station and the effective water head of each unit based on the effective water head of the power station and the effective water head of each unit, so as to ensure the safe and stable operation of the power station.

7. An electronic device, characterized in that: include: Memory, used to store programs; A processor is used to load the program to execute the steps of a method for fine calculation of water head of a hydropower station and a unit as described in any one of claims 1 to 5.

8. A computer-readable storage medium storing a program, characterized in that: When the program is executed by the processor, the steps of the method for fine calculation of the water head of a hydropower station and a unit as described in any one of claims 1 to 5 are implemented.

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