Hydropower station and unit water head fine calculation method, system, equipment and medium

Abstract

The invention discloses a hydropower station and unit water head fine calculation method, system and device and a medium, and belongs to the technical field of hydropower station and unit water head calculation. Designing an effectiveness judgment logic strategy; calculating a difference value of effective liquid levels of the power station to obtain an effective water head of the power station; calculating a gross water head of each unit to obtain an effective water head of each unit; locking and unlocking logics and alarm mechanisms of the effective water head of the power station and the effective water head of each unit are designed and executed respectively, and safe and stable operation of the power station is guaranteed. According to the method, the reliability of water head calculation is improved, and a good technical foundation is laid for fine economic optimization dispatching operation in a hydropower station plant.

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: (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.

[0003] (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.

[0004] (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.

[0005] (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

[0006] In view of the above existing problems, the present invention is proposed.

[0007] 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.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: In a first aspect, the present invention provides a method for finely calculating the water head of a hydropower station and a unit, comprising: Obtain the liquid level values for monitoring various states of the hydropower station; the liquid level values for monitoring various states include the liquid level in front of the trash rack, the liquid level behind the tail water gate, the liquid level behind the quick gate, and the liquid level in front of the tail water gate. Design an effectiveness determination logic strategy based on the liquid level values for monitoring various states after filtering processing. Based on the liquid level values for monitoring various states after passing the effectiveness determination, calculate the difference in the effective liquid level of the power station to obtain the effective head of the power station. Based on the liquid level values for monitoring various states after passing the effectiveness determination, calculate the gross head of each unit to obtain the effective head of each unit. Based on the effective head of the power station and the effective head of each unit, design and execute the locking, unlocking logic and alarm mechanism for the effective head of the power station and the effective head of each unit respectively to ensure the safe and stable operation of the power station.

[0009] As a preferred scheme of a method for fine calculation of the head of a hydropower station and its units according to the present invention, wherein: The filtering processing includes using a non-local mean filtering algorithm to filter the liquid level values for monitoring various states obtained and storing them in a database.

[0010] As a preferred scheme of a method for fine calculation of the head of a hydropower station and its units according to the present invention, wherein: the design of the effectiveness determination logic strategy includes: If the difference between the newly collected liquid level value for monitoring the state and the previous effective liquid level value does not exceed the set threshold, the newly collected liquid level value for monitoring the state is considered valid data. If the difference between the newly collected liquid level value for monitoring the state and the previous effective liquid level value exceeds the set threshold, it is considered that the newly collected liquid level value for monitoring the state has an abnormal jump and is marked as invalid data. If the liquid level channel used to calculate the liquid level value for monitoring the state fails, or the liquid level values for monitoring various states exceed the preset range, or there is an abnormal jump, a locking operation is performed on the corresponding liquid level value for monitoring the state. If the situation of abnormal jump is eliminated, an automatic unlocking operation is performed on the corresponding liquid level value for monitoring the state. If the situation of the failure of the liquid level channel used to calculate the liquid level value for monitoring the state and the liquid level values for monitoring various states exceeding the preset range is eliminated, a manual unlocking operation is performed. If the liquid level values for monitoring various states exceed the set safety range, an over-limit alarm is triggered. Compare the current liquid level values for monitoring various states with the average value within 20 scanning cycles. If the difference exceeds the set mutation threshold, a mutation alarm for the liquid level in front of the trash rack is triggered. Compare the liquid level values for monitoring various states at a preset time point with the current liquid level values for monitoring various states. If the difference exceeds the set slow change threshold, a slow change alarm for the head is triggered.

[0011] As a preferred solution of a fine calculation method for the water head of a hydropower station and its units according to the present invention, wherein: obtaining the effective water head of the power station includes: By calculating the average value of the effective liquid levels in front of the trash racks of the unblocked units, obtaining the effective liquid level in front of the trash racks of the power station; By calculating the average value of the effective liquid levels behind the tail water gates of the unblocked units, obtaining the effective liquid level behind the tail water gates of the power station; By calculating the difference between the effective liquid level in front of the trash racks of the power station and the effective liquid level behind the tail water gates, obtaining the effective water head of the power station.

[0012] As a preferred solution of a fine calculation method for the water head of a hydropower station and its units according to the present invention, wherein: obtaining the effective water head of each unit includes: After filtering and validity determination of the liquid level data behind the quick gates, obtaining the effective liquid level behind the quick gates of each unit; After filtering and validity determination of the liquid level data in front of the tail water gates, obtaining the effective liquid level in front of the tail water gates of each unit; By calculating the difference between the effective liquid level behind the quick gates and the effective liquid level in front of the tail water gates, obtaining the gross water head of each unit; By averaging the gross water head data of the first 10 times, obtaining the effective water head of each unit.

[0013] As a preferred solution of a fine calculation method for the water head of a hydropower station and its units according to the present invention, wherein: the locking, 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 change of the effective water head of the power station exceeds the limit value, then perform a locking operation on the current effective water head of the power station; If the situation that the change of the effective water head of the power station exceeds the limit value is eliminated, then perform an automatic unlocking operation on the current effective water head of the power station; If the situation that the liquid 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 is eliminated, then perform a manual unlocking operation; If the effective water head of the power station exceeds the set safety range, then trigger an over-limit alarm; Compare the current effective water head of the power station with the average water head within 20 scanning cycles. If the difference exceeds the set mutation threshold, then trigger a mutation alarm; Compare the effective water head of the power station at the preset time point with the current effective water head of the power station. If the difference exceeds the set slow change threshold, then trigger a slow change alarm of the water head.

[0014] As a preferred solution of a fine calculation method for the water head of a hydropower station and its units described in the present invention, where: the locking, unlocking logic and alarm mechanism for the effective water head of each unit include: If a fault occurs in the liquid level channel used to calculate the effective water head of each unit, or the effective water head of the unit exceeds the preset range, or the change in the effective water head of the unit exceeds the limit value, then a locking operation is performed on the current effective water head of the unit; If the situation where the change in the effective water head of the unit exceeds the limit value is eliminated, then an automatic unlocking operation is performed on the current effective water head of the unit; If the fault in the liquid level channel for calculating the effective water head of each unit and the situation where the effective water head of the unit exceeds the preset range are eliminated, then a manual unlocking operation is performed; If the effective water head of the unit exceeds the set safety range, then an over-limit alarm is triggered; Compare the current effective water head of the unit with the average water head within 20 scanning cycles. If the difference exceeds the set mutation threshold, then an alarm for sudden change in the water level in front of the trash rack is triggered; Compare the effective water head of the unit at the preset time point with the current effective water head of the unit. If the difference exceeds the set slow change threshold, then an alarm for slow change in the water head is triggered.

[0015] In a second aspect, the present invention provides a fine calculation system for the water head of a hydropower station and its units, including: An acquisition module for acquiring the liquid level values of various state monitors of the hydropower station; the liquid level values of various state monitors include the liquid level in front of the trash rack, the liquid level behind the tail water gate, the liquid level behind the quick gate, and the liquid level in front of the tail water gate; An effectiveness determination module for designing an effectiveness determination logic strategy based on the liquid level values of various state monitors after filtering; A power station effective water head calculation module for obtaining the effective water head of the power station by calculating the difference in the effective liquid levels of the power station based on the liquid level values of various state monitors after passing the effectiveness determination; A unit effective water head calculation module for obtaining the effective water head of each unit by calculating the gross water head of each unit based on the liquid level values of various state monitors after passing the effectiveness determination; A water head anomaly control and alarm module for designing and executing the locking, unlocking logic and alarm mechanism for the effective water head of the power station and each unit respectively based on the effective water head of the power station and the effective water head of each unit to ensure the safe and stable operation of the power station.

[0016] In a third aspect, the present invention provides an electronic device, including: A memory for storing programs; A processor for executing the computer-executable instructions, and when the computer-executable instructions are executed by the processor, the steps of the fine calculation method for the water head of a hydropower station and its units described above are implemented.

[0017] In a fourth aspect, the present invention provides a computer-readable storage medium, including: when the program is executed by a processor, the steps of the method for precisely calculating the water head of a hydropower station and its units are implemented.

[0018] Advantages of the present invention: The present invention not only considers the data of a single sensor, but also combines the liquid level information at multiple key positions such as in front of the trash rack and before and after the tail water gate, more accurately reflecting the actual working condition of the hydropower station and improving the accuracy of water head calculation; designs a detailed validity determination logic for the monitored liquid level values in each state to ensure that only valid data is used for subsequent calculations; designs elaborate locking, unlocking, and alarm logic strategies for the monitored liquid level values, the effective water head of the power station, and the water head of the units; significantly improves the accuracy and reliability of calculating the water head of the hydropower station and its units, and also enhances the stability and safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the basic process of a method for precisely calculating the water head of a hydropower station and its units provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of the layout of liquid level monitoring of a hydropower station and its units in a method for precisely calculating the water head of a hydropower station and its units provided by an embodiment of the present invention; Figure 3 It is a liquid level diagram in front of the trash rack of a power station unit in a method for precisely calculating the water head of a hydropower station and its units provided by an embodiment of the present invention; Figure 4 It is an effective liquid level diagram in front of the trash rack of a power station unit in a method for precisely calculating the water head of a hydropower station and its units provided by an embodiment of the present invention; Figure 5 It is a liquid level diagram behind the tail water gate of a power station unit in a method for precisely calculating the water head of a hydropower station and its units provided by an embodiment of the present invention; Figure 6 It is an effective liquid level diagram behind the tail water gate of a power station unit in a method for precisely calculating the water head of a hydropower station and its units provided by an embodiment of the present invention; Figure 7 It is an effective water head diagram of a power station in a method for precisely calculating the water head of a hydropower station and its units provided by an embodiment of the present invention; Figure 8The liquid level diagram behind the quick gate of the power station unit for a method of precisely calculating the water head of a hydropower station and its units provided by an embodiment of the present invention; Figure 9 The liquid level diagram in front of the tail water gate of the power station unit for a method of precisely calculating the water head of a hydropower station and its units provided by an embodiment of the present invention; Figure 10 The gross head diagram of the unit for a method of precisely calculating the water head of a hydropower station and its units provided by an embodiment of the present invention; Figure 11 The effective head diagram of the unit for a method of precisely calculating the water head of a hydropower station and its units provided by an embodiment of the present invention; Figure 12 The system display screen diagram for a method of precisely calculating the water head of a hydropower station and its units provided by an embodiment of the present invention. Detailed implementation manners

[0021] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following provides a detailed description of the specific implementation manners of the present invention in conjunction with the accompanying drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Embodiment 1, referring to Figure 1 , which is an embodiment of the present invention, and provides a method for precisely calculating the water head of a hydropower station and its units, including: S100: Obtain the liquid level values monitored in various states of the hydropower station; the liquid level values monitored in various states include the liquid level in front of the trash rack, the liquid level behind the tail water gate, the liquid level behind the quick gate, and the liquid level in front of the tail water gate; S200: Design an effectiveness determination logic strategy based on the liquid level values monitored in various states after filtering processing; S300: Based on the liquid level values monitored in various states after passing the effectiveness determination, obtain the effective water head of the power station by calculating the difference in the effective liquid level of the power station; S400: Based on the liquid level values monitored in various states after passing the effectiveness determination, obtain the effective water head of each unit by calculating the gross head of each unit; S500: Based on the effective water head of the power station and the effective water head of each unit, design and execute the locking, unlocking logic, and alarm mechanism for the effective water head of the power station and the effective water head of each unit respectively to ensure the safe and stable operation of the power station.

[0023] It should be noted that during the operation of hydropower units, the accurate calculation of the head of the power station and the units faces a series of challenges, including accuracy issues caused by the selection of upstream and downstream water levels at different points, insufficient accuracy and reliability of single-sensor measurement data, the influence of environmental factors such as wind and water flow fluctuations on water levels, and errors caused by sensor failures. These problems may lead to the monitoring system frequently receiving incorrect or fluctuating data, affecting the operators' accurate judgment of the actual water level and head, and lacking the ability to comprehensively process multi-source data to improve measurement accuracy. The head of the power station and the units, as a key factor affecting the operation and power generation of the units, not only determines important indicators such as the operation range and efficiency of the units, but also directly relates to the safe and stable operation of the hydropower station. Accurate head calculation helps to optimize the working state of the units, improve power generation efficiency, and ensure equipment safety, avoiding potential risks caused by inaccurate head calculation. Therefore, solving these challenges is crucial for improving the overall performance of the hydropower station.

[0024] Therefore, aiming at the problems of low accuracy and poor reliability of the existing head calculation methods, which affect the operation efficiency and stability of the units, through steps S100 - S500, by fully considering the characteristics of upstream and downstream hydraulic losses, the accuracy of head calculation is improved; in addition, by obtaining multiple representative water levels upstream and downstream, the logic of validity determination, locking, unlocking, and alarm is designed, improving the reliability of head calculation and laying a good technical foundation for the fine economic optimization operation of the hydropower station within the plant.

[0025] Example 2, this is an embodiment of the present invention. Based on the previous embodiment, a fine calculation method for the head of a hydropower station and its units is provided, including: In the embodiment of the present invention, obtaining the real-time state monitoring data of each liquid level in the hydropower station in step S100 includes obtaining the liquid levels in front of the trash racks of each unit, behind the tail water gate, behind the quick gate, and in front of the tail water gate from the computer monitoring system of the hydropower station.

[0026] In the embodiment of the present invention, the filtered state monitoring liquid level values in step S200 include filtering the obtained state monitoring liquid level values using the non-local means (NLM) filter algorithm and storing them in the database.

[0027] In the embodiment of the present invention, designing the validity determination logic strategy in step S200 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 (1.5 meters), then the newly collected state monitoring liquid level value is considered valid data; If the difference between the newly collected status monitoring liquid level value and the previous valid liquid level value exceeds the set threshold (1.5 meters), it is considered that the newly collected status monitoring liquid level value has jumped and is marked as invalid data. Discard the status monitoring liquid level values at the current moment and do not participate in the average calculation.

[0028] Use the sliding window averaging technique to calculate the status monitoring valid liquid level at the current moment. If the liquid level collected this time does not have an abnormal jump (i.e., the difference does not exceed 1.5 meters), then the status monitoring valid liquid level at the current moment = (the sum of the previous 9 valid liquid levels + the valid liquid level collected this time) / 10; if the liquid level collected this time has a jump (i.e., the difference exceeds 1.5 meters), then the status monitoring valid liquid level at the current moment = (the sum of the previous 10 status monitoring valid liquid levels) / 10. If the liquid level this time does not have an abnormal jump, add the collected value this time to the historical data queue and remove the earliest record to keep the most recent 10 valid data. If the liquid level this time has an abnormal jump, do not update the historical data queue and continue to use the previous 10 valid liquid levels for the next round of calculation.

[0029] If the liquid level channel used to calculate the status monitoring liquid level value fails, or the status monitoring liquid level values exceed the preset range (such as the minimum / maximum operating water level), or there is an abnormal jump, then mark the current liquid level as "invalid" and stop using this liquid level data to participate in any control, scheduling, or head calculation; enter the locked state and wait for unlocking. The failure of the liquid level channel used to calculate the status monitoring liquid level value includes the loss of the liquid level sensor signal, disconnection, etc., resulting in the inability to obtain valid data.

[0030] If the situation of abnormal jump is eliminated, perform an automatic unlocking operation on the corresponding status monitoring liquid level value; If the failure of the liquid level channel used to calculate the status monitoring liquid level value and the situation that the status monitoring liquid level values exceed the preset range are eliminated, perform a manual unlocking operation; If any of the above three locks occurs, forced unlocking can be performed through manual intervention, but it must be executed after the system prompts or confirms that there is no safety hazard.

[0031] When the status monitoring liquid level values exceed the set safety range, an over-limit alarm is triggered; In the embodiment of the present invention, the mutation alarm includes comparing the latest status monitoring liquid level values received by the local control unit (LCU) with the average value of the status monitoring liquid level values within 20 scan cycles. If it is greater than 1.5m, then trigger the mutation alarm of the water level in front of the trash rack; In the embodiment of the present invention, the slow change alarm includes taking the difference between the status monitoring liquid level values three minutes ago sent down and the current status monitoring liquid level values. If it is greater than 1.5m, then trigger the slow change alarm of the water head.

[0032] In the embodiment of the present invention, obtaining the effective head of the power station in step S300 includes: By calculating the average value of the effective liquid levels in front of the trash racks of the unblocked units, the effective liquid level in front of the trash racks of the power station is obtained; By calculating the average value of the effective liquid levels behind the tailwater gates of the unblocked units, the effective liquid level behind the tailwater gates of the power station is obtained; By calculating the difference between the effective liquid level in front of the trash racks of the power station and the effective liquid level behind the tailwater gates, the effective head of the power station is obtained.

[0033] In the embodiment of the present invention, obtaining the effective head of each unit in step S400 includes: After filtering and validity determination of the liquid level data behind the quick gates, the effective liquid level behind the quick gates of each unit is obtained; After filtering and validity determination of the liquid level data in front of the tailwater gates, the effective liquid level in front of the tailwater gates of each unit is obtained; By calculating the difference between the effective liquid level behind the quick gates and the effective liquid level in front of the tailwater gates, the gross head of each unit is obtained; By averaging the gross head data of the previous 10 times, the effective head of each unit is obtained.

[0034] In the embodiment of the present invention, the effective head of each unit is calculated by a moving average algorithm based on the most recently continuously collected 10 times of unit gross head data. If the change in the unit gross head collected at a certain time exceeds 3 meters compared with the previous moment, it is determined as an abnormal jump, and this data is discarded and not involved in the calculation. Under normal circumstances, the effective head of the unit at the current moment = (the sum of the effective gross heads of the previous 9 times + the effective gross head collected this time) / 10; if a jump occurs, a conservative strategy is adopted: the effective head of the unit at the current moment = (the sum of the effective gross heads of the previous 10 times) / 10.

[0035] The unit gross head data is collected once per second for real-time updating of the effective head value.

[0036] In the embodiment of the present invention, the locking, unlocking logic and alarm mechanism of the effective head of the power station in step S500 include: If the liquid level channel used to calculate the effective head of the power station fails, or the effective head of the power station exceeds the preset range, or the change in the effective head of the power station exceeds the limit value, then a locking operation is performed on the current effective head of the power station; When the situation where the change in the effective head of the power station exceeds the limit value is eliminated, then an automatic unlocking operation is performed on the current effective head of the power station; When the situations of the failure of the liquid level channel for calculating the effective head of the power station and the effective head of the power station exceeding the preset range are eliminated, manual intervention is required for unlocking; When the effective head of the power station exceeds the set safety range, an over-limit alarm is triggered; Compare the current effective head of the power station with the average value within 20 scan cycles. If the difference exceeds the set mutation threshold (3 meters), a mutation alarm is triggered. Compare the effective head of the power station at a preset time point (three minutes ago) with the effective head of the power station at the current moment. If the difference exceeds the set slow change threshold (3 meters), a slow change alarm of the water head is triggered.

[0037] In the embodiment of the present invention, the failure of the effective water level channel includes abnormalities (such as wire breakage, signal loss, etc.) in the liquid level acquisition channel in front of the trash rack or behind the tail water gate, resulting in unreliable data. The overlimit of the effective head of the power station includes that the currently calculated effective head of the power station exceeds the preset upper or lower limit value (for example: lower than the minimum power generation head or exceeding the maximum safety head); the change of the effective head of the power station exceeding the limit includes that the difference between the water head value at the current moment and the previous moment exceeds the set threshold (3 meters), indicating a mutation or abnormal fluctuation.

[0038] In the embodiment of the present invention, the locking, unlocking logic and alarm mechanism of the effective head of each unit in step S500 include: If there is a failure in the liquid level channel used to calculate the effective head of each unit, or the effective head of the unit exceeds the preset range, or the change of the effective head of the unit exceeds the limit, a locking operation is performed on the current effective head of the unit; When the situation where the change of the effective head of the unit exceeds the limit is eliminated, an automatic unlocking operation is performed on the current effective head of the unit; When the failures in the liquid level channels for calculating the effective heads of each unit and the situation where the effective heads of the units exceed the preset range are eliminated, unlocking needs to be performed through manual intervention; When the effective head of the unit exceeds the set safety range, an overlimit alarm is triggered; Compare the current effective head of the unit with the average value within 20 scan cycles. If the difference exceeds the set mutation threshold, a mutation alarm of the water level in front of the trash rack is triggered; Compare the effective head of the unit at a preset time point (three minutes ago) with the effective head of the unit at the current moment. If the difference exceeds the set slow change threshold, a slow change alarm of the water head is triggered.

[0039] In the embodiments of the present invention, a water level channel failure includes that if a liquid level acquisition channel before the trash rack or before the tailrace gate fails (such as wire breakage, signal loss, etc.), then locking is triggered, and the current unit head value is marked as invalid. The overlimit of the effective head of the unit includes that if the currently calculated effective head of the unit exceeds the preset safe upper and lower limit ranges (such as being lower than the minimum power generation head or exceeding the maximum safe head), then locking is triggered to prevent abnormal heads from participating in control decisions. The change of the effective head of the unit exceeding the limit includes that if the difference between the effective head of the unit at the current moment and that at the previous moment exceeds the set threshold (3 m), then locking is triggered to identify the risk of sudden fluctuations. The sudden change alarm of the unit head includes that if the difference between the latest effective head value of the unit received by the LCU and the average value within the past 20 scan cycles is greater than the set threshold (3 m), then a sudden change alarm is triggered to identify sudden abnormal heads and prevent miscontrol or equipment damage. The slow change alarm of the unit head includes that if the difference between the effective head value of the unit at the current moment and the head value three minutes ago is greater than the set threshold (3 m), then a slow change alarm is triggered to detect the abnormal trend of slow change and give an early warning of potential risks.

[0040] Embodiment 3, referring to Figures 2 - 12 , which is an embodiment of the present invention. This embodiment provides a fine calculation method for the water head of a hydropower station and its units. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through specific implementation methods and implementation effects.

[0041] The specific implementation of this embodiment is as follows: Taking a certain domestic hydropower station as an example, an SSK231-R2CDN150 / 6P1B112L75m type submersible pressure transmitter is selected to measure the liquid level in front of the trash racks of 4 units of the power station, an SSK231-R2CDN150 / 6P1B112L65m type submersible pressure transmitter is selected to measure the liquid levels before and after the tailrace gates of 2 tailrace tunnels of the power station, and an SSK231-R2CDN150 / 6P1B112L95m type submersible pressure transmitter is selected to measure the liquid level behind the quick gates of 4 units of the power station.

[0042] Step 1: As Figure 2 shown, through a programmable logic controller (PLC), the liquid level is collected and processed in real time, the collected liquid level of the state is denoised, and the validity of the state liquid level is judged. At the same time, the collected liquid level of the state is stored.

[0043] Step 2: Obtain the liquid levels in front of the trash racks and behind the tailrace gates of each unit, as shown in Figure 3 , Figure 4 respectively. Further calculate the effective liquid levels in front of the trash racks and behind the tailrace gates of the power station, and calculate the effective head of the power station, as shown in Figure 5 , Figure 6 and Figure 7 respectively.

[0044] Step 3: Obtain the liquid levels after the quick gates and before the tailrace gates of each unit, as shown in Figure 8 and Figure 9 respectively. Further calculate the gross head and effective head of each unit, as shown in Figure 10 and Figure 11 respectively.

[0045] Step 4: Develop a refined calculation system for the water head of the hydropower station and units to implement functions such as liquid level determination, display, locking, unlocking, alarm of the power station, and display, locking, unlocking, and alarm of the water head of the power station and units. The system interface is as shown in Figure 12 respectively.

[0046] Example 4. This is an example of the present invention. The difference between this example and the first example is that a refined calculation system for the water head of a hydropower station and units is provided.

[0047] It should be noted that the technical solution of this refined calculation system for the water head of the hydropower station and units belongs to the same concept as the technical solution of the above-mentioned refined calculation method for the water head of the hydropower station and units. For the details not described in detail in the technical solution of this refined calculation system for the water head of the hydropower station and units in this example, reference can be made to the description of the technical solution of the above-mentioned refined calculation method for the water head of the hydropower station and units.

[0048] A refined calculation system for the water head of a hydropower station and units in this example includes: An acquisition module for acquiring the liquid level values of various state monitors of the hydropower station; An effectiveness determination module for designing an effectiveness determination logic strategy based on the liquid level values of various state monitors after filtering processing; A power station effective head calculation module for obtaining the power station effective head by calculating the difference in the effective liquid levels of the power station based on the liquid level values of various state monitors after effectiveness determination; A unit effective head calculation module for obtaining the effective head of each unit by calculating the gross head of each unit based on the liquid level values of various state monitors after effectiveness determination; A water head anomaly control and alarm module for designing and executing the locking, unlocking logics and alarm mechanisms of the power station effective head and the effective heads of each unit respectively based on the power station effective head and the effective heads of each unit to ensure the safe and stable operation of the power station.

[0049] This example also provides an electronic device applicable to the situation of a refined calculation method for the water head of a hydropower station and units, including: A memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the implementation of a refined calculation method for the water head of a hydropower station and units as proposed in the above example.

[0050] This embodiment also provides a storage medium, on which a computer program is stored. When the program is executed by a processor, it implements the method for precisely calculating the water head of a hydropower station and its units as proposed in the above embodiment.

[0051] The storage medium proposed in this embodiment and the method for precisely calculating the water head of a hydropower station and its units proposed in the above embodiment belong to the same inventive concept. Technical details not described in detail in this embodiment can be referred to in the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0052] From the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software and necessary general-purpose hardware. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk, or optical disc of a computer, and includes several instructions for causing 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.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A fine calculation method for the water head of a hydropower station and its units, characterized in that, Including: Obtaining the liquid level values of various status monitors of the hydropower station; the liquid level values of various status monitors include the liquid level in front of the trash rack, the liquid level behind the tail water gate, the liquid level behind the quick gate, and the liquid level in front of the tail water gate. Designing an effectiveness determination logic strategy based on the liquid level values of various status monitors after filtering processing. Based on the liquid level values of various status monitors after passing the effectiveness determination, by calculating the difference in the effective liquid level of the power station, obtaining the effective head of the power station. Based on the liquid level values of various status monitors after passing the effectiveness determination, by calculating the gross head of each unit, obtaining the effective head of each unit. Based on the effective head of the power station and the effective head of each unit, respectively designing and implementing the locking, unlocking logic and alarm mechanism for the effective head of the power station and the effective head of each unit to ensure the safe and stable operation of the power station.

2. The fine calculation method of the water head of a hydropower station and its unit according to claim 1, characterized in that: The filtering processing includes using a non-local mean filtering algorithm to filter the obtained liquid level values of various status monitors and storing them in the database.

3. The fine calculation method for the water head of a hydropower station and its units according to claim 2, characterized in that: The design of the effectiveness determination logic strategy includes: If the difference between the newly collected liquid level value of the status monitor and the previous effective liquid level value does not exceed the set threshold, the newly collected liquid level value of the status monitor is considered valid data. If the difference between the newly collected liquid level value of the status monitor and the previous effective liquid level value exceeds the set threshold, it is considered that the newly collected liquid level value of the status monitor has an abnormal jump and is marked as invalid data. If the liquid level channel used to calculate the liquid level value of the status monitor fails, or the liquid level values of various status monitors exceed the preset range, or there is an abnormal jump, then a locking operation is performed on the corresponding liquid level value of the status monitor. If the situation of abnormal jump is eliminated, an automatic unlocking operation is performed on the corresponding liquid level value of the status monitor. If the situation of the failure of the liquid level channel for calculating the liquid level value of the status monitor and the liquid level values of various status monitors exceeding the preset range is eliminated, a manual unlocking operation is performed. If the liquid level values of various status monitors exceed the set safety range, an over-limit alarm is triggered. Compare the current liquid level values of various status monitors with the average value within 20 scanning cycles. If the difference exceeds the set mutation threshold, a mutation alarm for the water level in front of the trash rack is triggered. Compare the liquid level values of various status monitors at a preset time point with the current liquid level values of various status monitors. If the difference exceeds the set slow change threshold, a slow change alarm for the head is triggered.

4. A fine calculation method for the water head of a hydropower station and its units according to claim 3, characterized in that: The obtaining of the effective head of the power station includes: By calculating the average value of the effective liquid level in front of the trash rack of the un-locked units, obtaining the effective liquid level in front of the trash rack of the power station. By calculating the average value of the effective liquid level behind the tail water gate of the un-locked units, obtaining the effective liquid level behind the tail water gate of the power station. By calculating the difference between the effective liquid level in front of the trash rack of the power station and the effective liquid level behind the tail water gate, obtaining the effective head of the power station.

5. A fine calculation method for the water head of a hydropower station and its units as claimed in claim 4, characterized in that: The obtaining of the effective head of each unit includes: After filtering processing and effectiveness determination of the liquid level data behind the quick gate, obtaining the effective liquid level behind the quick gate of each unit. After filtering processing and effectiveness determination of the liquid level data in front of the tail water gate, obtaining the effective liquid level in front of the tail water gate of each unit. By calculating the difference between the effective liquid level behind the quick gate and the effective liquid level in front of the tail water gate, obtaining the gross head of each unit. By averaging the gross head data of the previous 10 times, obtaining the effective head of each unit.

6. A fine calculation method for the water head of a hydropower station and its units as described in claim 5, characterized in that: The locking, unlocking logic and alarm mechanism for the effective head of the power station include: If a fault occurs in the liquid level channel used to calculate the effective head of the power station, or the effective head of the power station exceeds the preset range, or the change in the effective head of the power station exceeds the limit value, then a locking operation is performed on the current effective head of the power station; If the situation where the change in the effective head of the power station exceeds the limit value is eliminated, then an automatic unlocking operation is performed on the current effective head of the power station; If the fault in the liquid level channel used to calculate the effective head of the power station and the situation where the effective head of the power station exceeds the preset range are eliminated, then a manual unlocking operation is performed; If the effective head of the power station exceeds the set safety range, then an over-limit alarm is triggered; Compare the current effective head of the power station with the average head within 20 scan cycles. If the difference exceeds the set mutation threshold, then a mutation alarm is triggered; Compare the effective head of the power station at the preset time point with the current effective head of the power station. If the difference exceeds the set slow change threshold, then a slow change alarm of the head is triggered.

7. A fine calculation method for the water head of a hydropower station and its units according to claim 6, characterized in that: The locking, unlocking logic and alarm mechanism for the effective head of each unit include: If a fault occurs in the liquid level channel used to calculate the effective head of each unit, or the effective head of the unit exceeds the preset range, or the change in the effective head of the unit exceeds the limit value, then a locking operation is performed on the current effective head of the unit; If the situation where the change in the effective head of the unit exceeds the limit value is eliminated, then an automatic unlocking operation is performed on the current effective head of the unit; If the fault in the liquid level channel used to calculate the effective head of each unit and the situation where the effective head of the unit exceeds the preset range are eliminated, then a manual unlocking operation is performed; If the effective head of the unit exceeds the set safety range, then an over-limit alarm is triggered; Compare the current effective head of the unit with the average head within 20 scan cycles. If the difference exceeds the set mutation threshold, then a mutation alarm of the water level in front of the trash rack is triggered; Compare the effective head of the unit at the preset time point with the current effective head of the unit. If the difference exceeds the set slow change threshold, then a slow change alarm of the head is triggered.

8. A fine calculation system for the water head of a hydropower station and its units, which applies the fine calculation method for the water head of a hydropower station and its units according to any one of claims 1-7, characterized in that, It includes: An acquisition module for acquiring the liquid level values of various state monitors of the hydropower station; the liquid level values of various state monitors include the liquid level in front of the trash rack, the liquid level behind the tail water gate, the liquid level behind the quick gate, and the liquid level in front of the tail water gate; An effectiveness determination module for designing an effectiveness determination logic strategy based on the liquid level values of various state monitors after filtering processing; A power station effective head calculation module for obtaining the power station effective head by calculating the difference in the effective liquid levels of the power station based on the liquid level values of various state monitors after effectiveness determination; A unit effective head calculation module for obtaining the effective head of each unit by calculating the gross head of each unit based on the liquid level values of various state monitors after effectiveness determination; A head anomaly control and alarm module for respectively designing and implementing the locking, unlocking logic and alarm mechanism for the power station effective head and the effective head of each unit based on the power station effective head and the effective head of each unit, to ensure the safe and stable operation of the power station.

9. An electronic device, characterized in that, It includes: A memory for storing programs; A processor for loading the program to execute the steps of a method for fine calculation of the head of a hydropower station and its units as described in any one of claims 1-7.

10. A computer-readable storage medium storing a program, characterized in that, When the described program is executed by a processor, the steps of a method for precisely calculating the water head of a hydropower station and its units as described in any one of claims 1-7 are implemented.

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