Hydropower station cylinder valve opening degree calculation method

Abstract

The invention provides a hydropower station cylinder valve opening degree calculation method. The method comprises the steps that the oil inlet and outlet flow of a rodless cavity of a cylinder valve servomotor is collected; a unit measurement time interval is set, and the amount of oil flowing into the rodless cavity of the servomotor within the time interval is calculated according to the oil inlet and outlet flow of the rodless cavity of the servomotor; according to the amount of oil flowing into the rodless cavity of the servomotor within the time interval, the sectional area of a piston rod of the servomotor and the length of the piston rod of the servomotor, the first opening degree of the servomotor within the preset time is calculated; and based on the first opening degrees of all servomotors of the cylinder valve, the average value is taken as the first final opening degree of the cylinder valve within the preset time. According to the method for calculating the opening degree of the cylindrical valve of the hydropower station, calculation of the opening degree of the cylindrical valve is achieved through the oil inlet and outlet flow of the rodless cavity of the servomotor, the anti-interference capacity is higher, and therefore it is guaranteed that obtaining of the opening degree of the cylindrical valve has higher measurement precision and reliability.

Description

Technical Field

[0001] The present disclosure relates to the technical field of calculating the opening degree of a cylindrical valve, and particularly to a method for calculating the opening degree of a cylindrical valve in a hydropower station. Background Art

[0002] The cylindrical valve of a hydropower station is a very important auxiliary device of a water turbine. It is arranged between the fixed guide vanes and the movable guide vanes of the water turbine and plays a role in blocking flow and holding back water. When the unit runs away or the guide vane mechanism fails, the cylindrical valve can be closed to stop the machine, thus ensuring the safe and stable operation of the unit.

[0003] Currently, the opening degree of the cylindrical valve in a hydropower plant is mostly obtained by displacement detection. However, this method has low measurement accuracy and poor reliability, and it is difficult to meet the usage requirements. Summary of the Invention

[0004] The present disclosure aims to solve at least one of the technical problems in the related art to some extent.

[0005] To this end, the purpose of the present disclosure is to provide a method for calculating the opening degree of a cylindrical valve in a hydropower station.

[0006] To achieve the above purpose, the present disclosure provides a method for calculating the opening degree of a cylindrical valve in a hydropower station, including: collecting the inlet and outlet oil flow rates of the rodless cavity of the cylinder of the cylindrical valve; setting a unit measurement time interval, and calculating the amount of oil flowing into the rodless cavity of the cylinder within the time interval according to the inlet and outlet oil flow rates of the rodless cavity of the cylinder; calculating the first opening degree of the cylinder within a preset time according to the amount of oil flowing into the rodless cavity of the cylinder within the time interval, the cross-sectional area of the piston rod of the cylinder, and the length of the piston rod of the cylinder; based on the first opening degrees of the cylinders of the cylindrical valve, taking the average value as the first final opening degree of the cylindrical valve within the preset time.

[0007] Optionally, the method further includes: collecting the displacement amount of the piston rod of the cylinder; calculating the second opening degree of the cylinder within the preset time based on the displacement amount of the piston rod of the cylinder; based on the second opening degrees of the cylinders of the cylindrical valve, taking the average value or the maximum or minimum value as the second final opening degree of the cylindrical valve within the preset time; verifying the first final opening degree based on the second final opening degree, or verifying the second final opening degree based on the first final opening degree.

[0008] Optionally, the method further includes: setting a displacement sensor between the piston rod and the cylinder barrel of the cylinder, and using the displacement sensor to collect the displacement amount of the piston rod of the cylinder.

[0009] Optionally, the method further includes: collecting the oil inlet and outlet flow rates of the rod chamber of the servomotor; calculating the amount of oil flowing out of the rod chamber of the servomotor within the time interval according to the oil inlet and outlet flow rates of the rod chamber of the servomotor; calculating a third opening degree of the servomotor within the preset time according to the amount of oil flowing out of the rod chamber of the servomotor within the time interval, the cross-sectional area of the piston rod of the servomotor, and the length of the piston rod of the servomotor; taking an average value of the third opening degrees of the respective servomotors of the cylinder valve as the third final opening degree of the cylinder valve within the preset time based on the third opening degrees of the respective servomotors of the cylinder valve; verifying the first final opening degree based on the third final opening degree, or verifying the third final opening degree based on the first final opening degree.

[0010] Optionally, the method further includes: arranging a first flowmeter at the oil inlet and outlet ports of the rodless chamber of the servomotor, and collecting the oil inlet and outlet flow rates of the rodless chamber of the cylinder valve servomotor by using the first flowmeter; arranging a second flowmeter at the oil inlet and outlet ports of the rod chamber of the servomotor, and collecting the oil inlet and outlet flow rates of the rod chamber of the cylinder valve servomotor by using the second flowmeter.

[0011] Optionally, the method further includes: collecting the oil inlet and outlet temperatures of the rodless chamber of the servomotor; calculating the temperature difference between the oil inlet and outlet temperatures of the rodless chamber of the servomotor and a preset temperature; calculating a first oil quantity compensation value flowing into the rodless chamber of the servomotor within the time interval according to the temperature difference; compensating the first oil quantity compensation value into the amount of oil flowing into the rodless chamber of the servomotor within the time interval.

[0012] Optionally, the method further includes: arranging a temperature sensor at the oil inlet and outlet ports of the rodless chamber of the servomotor, and collecting the oil inlet and outlet temperatures of the rodless chamber of the servomotor by using the temperature sensor.

[0013] Optionally, the method further includes: collecting the oil inlet and outlet pressures of the rodless chamber of the servomotor; calculating the pressure difference between the oil inlet and outlet pressures of the rodless chamber of the servomotor and a preset pressure; calculating a second oil quantity compensation value flowing into the rodless chamber of the servomotor within the time interval according to the pressure difference; compensating the second oil quantity compensation value into the amount of oil flowing into the rodless chamber of the servomotor within the time interval.

[0014] Optionally, the method further includes: arranging a pressure sensor at the oil inlet and outlet ports of the rodless chamber of the servomotor, and collecting the oil inlet and outlet pressures of the rodless chamber of the servomotor by using the pressure sensor.

[0015] Optionally, the method further includes: calculating a first opening degree of the servomotor within a preset time based on an opening degree formula; where the opening degree formula is: h = H - V / S; h is the first opening degree of the servomotor within the preset time, H is the length of the piston rod of the servomotor, V is the amount of oil flowing into the rodless cavity of the servomotor within the preset time, and S is the cross-sectional area of the piston rod of the servomotor.

[0016] The technical solution provided by the present disclosure may include the following beneficial effects:

[0017] According to the amount of oil flowing into the rodless cavity of the servomotor within a time interval, the cross-sectional area of the piston rod of the servomotor, and the length of the piston rod of the servomotor, calculate the first opening degree of the servomotor within a preset time, and based on the first opening degrees of each servomotor of the cylindrical valve, take the average value as the first final opening degree of the cylindrical valve within the preset time. Thus, the opening degree of the cylindrical valve is calculated by using the oil flow rate in and out of the rodless cavity of the servomotor. Compared with the traditional displacement calculation, the method of calculating the oil flow rate in and out has stronger anti-interference ability, thereby ensuring that the acquisition of the opening degree of the cylindrical valve has higher measurement accuracy and reliability, and further meeting the safety operation requirements of the hydropower station.

[0018] The additional aspects and advantages of the present disclosure will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present disclosure. Description of the Drawings

[0019] The above-mentioned and / or additional aspects and advantages of the present disclosure will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings, where:

[0020] Figure 1 is a schematic flowchart of a method for calculating the opening degree of a cylindrical valve of a hydropower station proposed by an embodiment of the present disclosure;

[0021] Figure 2 is a schematic structural diagram of a cylindrical valve proposed by an embodiment of the present disclosure;

[0022] As shown in the figure: 1. Cylindrical valve, 2. Servomotor, 21. Cylinder barrel, 22. Piston rod, 23. Rodless cavity, 24. Rod cavity. Detailed Embodiments

[0023] The embodiments of the present disclosure will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary only for explaining the present disclosure and should not be construed as a limitation of the present disclosure. On the contrary, the embodiments of the present disclosure include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0024] AsFigure 1 and Figure 2 As shown in Figure 2 , an embodiment of the present disclosure provides a method for calculating the opening degree of a cylindrical valve 1 of a hydropower station, including:

[0025] S1: Collect the oil inlet and outlet flow rates of the rodless cavity 23 of the servomotor 2 of the cylindrical valve 1;

[0026] S2: Set a unit measurement time interval, and calculate the amount of oil flowing into the rodless cavity 23 of the servomotor 2 within the time interval according to the oil inlet and outlet flow rates of the rodless cavity 23 of the servomotor 2;

[0027] S3: Calculate the first opening degree of the servomotor 2 within a preset time according to the amount of oil flowing into the rodless cavity 23 of the servomotor 2 within the time interval, the cross-sectional area of the piston rod 22 of the servomotor 2, and the length of the piston rod 22 of the servomotor 2;

[0028] S4: Based on the first opening degrees of the respective servomotors 2 of the cylindrical valve 1, take the average value as the first final opening degree of the cylindrical valve 1 within a preset time.

[0029] It can be understood that according to the amount of oil flowing into the rodless cavity 23 of the servomotor 2 within the time interval, the cross-sectional area of the piston rod 22 of the servomotor 2, and the length of the piston rod 22 of the servomotor 2, the first opening degree of the servomotor 2 within a preset time is calculated, and based on the first opening degrees of the respective servomotors 2 of the cylindrical valve 1, the average value is taken as the first final opening degree of the cylindrical valve 1 within a preset time. Thus, the calculation of the opening degree of the cylindrical valve 1 is realized by using the oil inlet and outlet flow rates of the rodless cavity 23 of the servomotor 2. Compared with the traditional displacement calculation, the method of calculating the oil inlet and outlet flow rates has stronger anti-interference ability, thereby ensuring that the acquisition of the opening degree of the cylindrical valve 1 has higher measurement accuracy and reliability, and further meeting the safety operation requirements of the hydropower station.

[0030] It should be noted that the cylindrical valve 1 is a valve that controls the on-off or flow regulation of fluid by the up and down movement of a cylindrical valve body. Its core component is a cylindrical valve body, and the opening and closing of the valve and the flow regulation are realized through vertical movement. In this embodiment, the cylindrical valve 1 is arranged between the stay vanes and the guide vanes of the water turbine, playing the role of blocking flow and water.

[0031] The servomotor 2 is a device that converts hydraulic energy or pneumatic energy into mechanical energy and is used to drive the movement of the valve body of the cylindrical valve 1. The servomotor 2 usually consists of a cylinder barrel 21, a piston rod 22, seals, etc.

[0032] Among them, when the piston rod 22 of the servomotor 2 extends, it means that the upper cavity of the servomotor 2 is filled with oil and the lower cavity discharges oil, and at this time the cylindrical valve 1 is opened; when the piston rod 22 of the servomotor 2 retracts, it means that the lower cavity of the servomotor 2 is filled with oil and the upper cavity discharges oil, and at this time the cylindrical valve 1 is closed.

[0033] For the amount of oil flowing into the rodless chamber 23 of the servomotor 2 within a time interval, it can be expressed by the following formula:

[0034] V1 = Q1 × t1;

[0035] Wherein, V1 is the amount of oil flowing into the rodless chamber 23 of the servomotor 2 within the time interval, Q1 is the oil inflow and outflow rate of the rodless chamber 23 of the servomotor 2, and t1 is the set time interval.

[0036] And for the amount of oil flowing into the rodless chamber 23 of the servomotor 2 within a preset time, it can be expressed by the following formula:

[0037] V = V1 + V2 + V3 + ··· + Vn;

[0038] Wherein, V is the amount of oil flowing into the rodless chamber 23 of the servomotor 2 within the preset time, n is the number of time intervals within the preset time. For example, when the time interval is 1 s and the preset time is 3 s, then V = V1 + V2 + V3, and V1 is the amount of oil flowing into the rodless chamber 23 of the servomotor 2 within the 1st second, V2 is the amount of oil flowing into the rodless chamber 23 of the servomotor 2 within the 2nd second, and V3 is the amount of oil flowing into the rodless chamber 23 of the servomotor 2 within the 3rd second.

[0039] In some embodiments, the method further includes:

[0040] Collecting the displacement of the piston rod 22 of the servomotor 2;

[0041] Calculating the second opening of the servomotor 2 within the preset time based on the displacement of the piston rod 22 of the servomotor 2;

[0042] Based on the second openings of each servomotor 2 of the cylinder valve 1, taking the average value or the maximum or minimum value as the second final opening of the cylinder valve 1 within the preset time;

[0043] Verifying the first final opening based on the second final opening, or verifying the second final opening based on the first final opening.

[0044] It can be understood that the second opening of the servomotor 2 within the preset time is calculated based on the displacement of the piston rod 22 of the servomotor 2, and based on the second openings of each servomotor 2 of the cylinder valve 1, taking the average value or the maximum or minimum value as the second final opening of the cylinder valve 1 within the preset time, thereby realizing the calculation of the opening of the cylinder valve 1 by using the displacement of the piston rod 22 of the servomotor 2. Thus, verifying the first final opening based on the second final opening, or verifying the second final opening based on the first final opening, effectively improves the accuracy and reliability of the calculation of the opening of the cylinder valve 1, and further meets the safety operation requirements of the hydropower station.

[0045] It should be noted that the first final opening is verified based on the second final opening to solve the problems existing in the oil flow calculation method, or the second final opening is verified based on the first final opening to solve the problems existing in the displacement calculation method.

[0046] Verifying the first final opening based on the second final opening, or verifying the second final opening based on the first final opening, can achieve redundant verification calculation of the opening of the cylinder valve 1, thereby improving the automation level and equipment redundancy, and has important guiding significance for improving the safe and stable operation of hydro-generator units in the industry. This technology is suitable for full promotion in the industry.

[0047] In some embodiments, the method further includes:

[0048] A displacement sensor is arranged between the piston rod 22 and the cylinder barrel 21 of the servomotor 2, and the displacement sensor is used to collect the displacement of the piston rod 22 of the servomotor 2.

[0049] It can be understood that a displacement sensor is arranged between the piston rod 22 and the cylinder barrel 21 of the servomotor 2, so as to collect the displacement of the piston rod 22 of the servomotor 2 by using the displacement sensor, and further ensure the stable and accurate acquisition of the second opening of the servomotor 2.

[0050] It should be noted that the displacement sensor is used to detect the displacement of the piston rod 22 of the servomotor 2, and the specific type of the displacement sensor can be set according to actual needs, and there is no limitation on this. For example, the displacement sensor can be a magnetostrictive displacement sensor, a wire-drawing displacement sensor, etc.

[0051] In some embodiments, the method further includes:

[0052] Collect the oil flow in and out of the rod chamber 24 of the servomotor 2;

[0053] Calculate the amount of oil flowing out of the rod chamber 24 of the servomotor 2 within a time interval according to the oil flow in and out of the rod chamber 24 of the servomotor 2;

[0054] Calculate the third opening of the servomotor 2 within a preset time according to the amount of oil flowing out of the rod chamber 24 of the servomotor 2 within a time interval, the cross-sectional area of the piston rod 22 of the servomotor 2, and the length of the piston rod 22 of the servomotor 2;

[0055] Based on the third opening of each servomotor 2 of the cylinder valve 1, take the average value as the third final opening of the cylinder valve 1 within a preset time;

[0056] Verify the first final opening based on the third final opening, or verify the third final opening based on the first final opening.

[0057] It can be understood that, according to the oil volume flowing out of the rod chamber 24 of the servomotor 2 within the time interval, the cross-sectional area of the piston rod 22 of the servomotor 2, and the length of the piston rod 22 of the servomotor 2, the third opening degree of the servomotor 2 within the preset time is calculated, and based on the third opening degrees of each servomotor 2 of the cylindrical valve 1, the average value is taken as the third final opening degree of the cylindrical valve 1 within the preset time, thereby realizing the calculation of the opening degree of the cylindrical valve 1 by using the oil flow in and out of the rod chamber 24 of the servomotor 2. Thus, the first final opening degree is verified based on the third final opening degree, or the third final opening degree is verified based on the first final opening degree, thereby effectively improving the accuracy and reliability of the opening degree calculation of the cylindrical valve 1, and further meeting the safety operation requirements of the hydropower station.

[0058] It should be noted that the first final opening degree is verified based on the third final opening degree to solve the problems existing in the calculation method of the oil flow in the rodless chamber 23 of the servomotor 2, or the third final opening degree is verified based on the first final opening degree to solve the problems existing in the calculation method of the oil flow in the rod chamber 24 of the servomotor 2.

[0059] Verifying the first final opening degree based on the third final opening degree, or verifying the third final opening degree based on the first final opening degree, can realize the redundant verification calculation of the opening degree of the cylindrical valve 1, thereby improving the automation level and equipment redundancy, and has important guiding significance for improving the safe and stable operation of hydro-generator units in the industry. This technology is suitable for full promotion in the industry.

[0060] The only difference between the calculation method of the third opening degree and the calculation method of the first opening degree is that the calculation of the third opening degree is based on the oil volume flowing out of the rod chamber 24 of the servomotor 2, rather than the oil volume flowing into the rodless chamber 23 of the servomotor 2. Therefore, it is necessary to distinguish during calculation.

[0061] In some embodiments, the method further includes:

[0062] A first flowmeter is set at the oil inlet and outlet ports of the rodless chamber 23 of the servomotor 2, and the first flowmeter is used to collect the oil flow in and out of the rodless chamber 23 of the servomotor 2 of the cylindrical valve 1;

[0063] A second flowmeter is set at the oil inlet and outlet ports of the rod chamber 24 of the servomotor 2, and the second flowmeter is used to collect the oil flow in and out of the rod chamber 24 of the servomotor 2 of the cylindrical valve 1.

[0064] It can be understood that a first flowmeter is set at the oil inlet and outlet ports of the rodless chamber 23 of the servomotor 2, so that the first flowmeter can be used to collect the oil flow in and out of the rodless chamber 23 of the servomotor 2 of the cylindrical valve 1, and further ensure the stable and accurate acquisition of the first opening degree of the servomotor 2.

[0065] A second flowmeter is set at the oil inlet and outlet ports of the rod chamber 24 of the servomotor 2, so that the second flowmeter can be used to collect the oil flow in and out of the rod chamber 24 of the servomotor 2 of the cylindrical valve 1, and further ensure the stable and accurate acquisition of the third opening degree of the servomotor 2.

[0066] It should be noted that both the first flowmeter and the second flowmeter are flowmeters. The specific types of the first flowmeter and the second flowmeter can be set according to actual needs, and there is no limitation in this regard. For example, the first flowmeter and the second flowmeter can be electromagnetic flowmeters, turbine flowmeters, ultrasonic flowmeters, etc.

[0067] In some embodiments, the method further includes:

[0068] Collect the inlet and outlet oil temperatures of the rodless cavity 23 of the servomotor 2;

[0069] Calculate the temperature difference between the inlet and outlet oil temperatures of the rodless cavity 23 of the servomotor 2 and a preset temperature;

[0070] Calculate the first oil quantity compensation value flowing into the rodless cavity 23 of the servomotor 2 within a time interval according to the temperature difference;

[0071] Compensate the first oil quantity compensation value into the oil quantity flowing in within the time interval.

[0072] It can be understood that by calculating the temperature difference between the inlet and outlet oil temperatures of the rodless cavity 23 of the servomotor 2 and calculating the first oil quantity compensation value flowing into the rodless cavity 23 of the servomotor 2 within a time interval according to the temperature difference, and compensating the first oil quantity compensation value into the oil quantity flowing into the rodless cavity 23 of the servomotor 2 within the time interval, the temperature compensation of the oil quantity flowing into the rodless cavity 23 of the servomotor 2 within the time interval is realized, thereby ensuring the stable and accurate acquisition of the first opening degree.

[0073] It should be noted that during the oil quantity measurement process, the temperature change of the oil fluid will affect the oil quantity measurement. In this embodiment, according to the temperature change of the oil fluid, the oil quantity measurement result is dynamically compensated, so as to eliminate the influence of environmental factors on the measurement, and further effectively improve the calculation accuracy of the first opening degree.

[0074] In some embodiments, the method further includes:

[0075] Set a temperature sensor at the inlet and outlet ports of the rodless cavity 23 of the servomotor 2, and use the temperature sensor to collect the inlet and outlet oil temperatures of the rodless cavity 23 of the servomotor 2.

[0076] It can be understood that by setting a temperature sensor at the inlet and outlet ports of the rodless cavity 23 of the servomotor 2, the inlet and outlet oil temperatures of the rodless cavity 23 of the servomotor 2 can be collected by the temperature sensor, and then the temperature compensation of the oil quantity in the rodless cavity 23 of the servomotor 2 can be carried out by using the inlet and outlet oil temperatures of the rodless cavity 23 of the servomotor 2.

[0077] It should be noted that the specific type of the temperature sensor can be set according to actual needs, and there is no limitation in this regard.

[0078] Among them, for the calculation of the oil quantity in the rod chamber 24 of the servomotor 2, temperature compensation can also be carried out in the same way.

[0079] In some embodiments, the method further includes:

[0080] Collect the inlet and outlet oil pressures of the rodless chamber 23 of the servomotor 2;

[0081] Calculate the pressure difference between the inlet and outlet oil pressures of the rodless chamber 23 of the servomotor 2 and a preset pressure;

[0082] Calculate a second oil quantity compensation value flowing into the rodless chamber 23 of the servomotor 2 within a time interval according to the pressure difference;

[0083] Compensate the second oil quantity compensation value into the oil quantity flowing into the rodless chamber 23 of the servomotor 2 within the time interval.

[0084] It can be understood that the pressure difference between the inlet and outlet oil pressures of the rodless chamber 23 of the servomotor 2 is calculated, and a second oil quantity compensation value flowing into the rodless chamber 23 of the servomotor 2 within a time interval is calculated according to the pressure difference, and the second oil quantity compensation value is compensated into the oil quantity flowing into the rodless chamber 23 of the servomotor 2 within the time interval, thereby realizing the pressure compensation of the oil quantity flowing into the rodless chamber 23 of the servomotor 2 within the time interval, and further ensuring the stable and accurate acquisition of the first opening degree.

[0085] It should be noted that during the oil quantity measurement process, the pressure change of the oil will affect the oil quantity measurement. In this embodiment, according to the pressure change of the oil, the oil quantity measurement result is dynamically compensated, so as to eliminate the influence of environmental factors on the measurement, and further effectively improve the calculation accuracy of the first opening degree.

[0086] In some embodiments, the method further includes:

[0087] A pressure sensor is arranged at the inlet and outlet ports of the rodless chamber 23 of the servomotor 2, and the inlet and outlet oil pressures of the rodless chamber 23 of the servomotor 2 are collected by using the pressure sensor.

[0088] It can be understood that a pressure sensor is arranged at the inlet and outlet ports of the rodless chamber 23 of the servomotor 2, so that the inlet and outlet oil pressures of the rodless chamber 23 of the servomotor 2 can be collected by using the pressure sensor, and then the pressure compensation of the oil quantity in the rodless chamber 23 of the servomotor 2 is carried out by using the inlet and outlet oil pressures of the rodless chamber 23 of the servomotor 2.

[0089] It should be noted that the specific type of the pressure sensor can be set according to actual needs, and no limitation is made thereto.

[0090] Among them, for the calculation of the oil quantity in the rod chamber 24 of the servomotor 2, pressure compensation can also be carried out in the same way.

[0091] In some embodiments, the method further includes:

[0092] Calculate the first opening degree of the servomotor 2 within a preset time based on the opening degree formula;

[0093] Wherein, the opening degree formula is:

[0094] h = H - V / S;

[0095] h is the first opening degree of the servomotor 2 within a preset time, H is the length of the piston rod 22 of the servomotor 2, V is the amount of oil flowing into the rodless cavity 23 of the servomotor 2 within a preset time, and S is the cross-sectional area of the piston rod 22 of the servomotor 2.

[0096] It can be understood that by using the amount of oil flowing into the rodless cavity 23 of the servomotor 2 within a preset time, the cross-sectional area of the piston rod 22 of the servomotor 2, the length of the piston rod 22 of the servomotor 2, and the opening degree formula, the first opening degree of the servomotor 2 within a preset time can be accurately calculated, so as to obtain the accurate opening degree of the cylinder valve 1 by using the first opening degree.

[0097] It should be noted that in the description of the present disclosure, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, the meaning of "a plurality" is two or more.

[0098] Any process or method description shown in the flowchart or described in other ways herein can be understood as representing a module, segment, or part of executable instructions including one or more steps for implementing a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in the reverse order according to the involved functions, rather than in the order shown or discussed, which should be understood by those skilled in the technical field to which the embodiments of the present disclosure belong.

[0099] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0100] Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A method for calculating the opening of a cylinder valve in a hydropower station, characterized in that: include: collecting the inlet and outlet oil flows of the rodless chamber of the cylindrical valve servomotor; Setting a unit measurement time interval, and calculating the amount of oil flowing into the rodless cavity of the servomotor within the time interval according to the inflow and outflow oil flow rates of the rodless cavity of the servomotor; Calculating a first opening of the servomotor within a preset time according to the amount of oil flowing into the rodless chamber of the servomotor within the time interval, the cross-sectional area of ​​the piston rod of the servomotor, and the length of the piston rod of the servomotor; Based on the first openings of the servomotors of the cylinder valve, an average value is taken as the first final opening of the cylinder valve within the preset time.

2. The method for calculating the opening of a cylinder valve of a hydropower station according to claim 1, characterized in that: The method further comprises: collecting the displacement of the piston rod of the servomotor; Calculating a second opening degree of the servomotor within the preset time based on the displacement of the piston rod of the servomotor; Based on the second openings of the servomotors of the cylinder valve, taking an average value or a maximum value as the second final opening of the cylinder valve within the preset time; The first final opening is verified based on the second final opening, or the second final opening is verified based on the first final opening.

3. The method for calculating the opening of a cylinder valve of a hydropower station according to claim 2, characterized in that: The method further comprises: A displacement sensor is arranged between the piston rod and the cylinder of the servomotor, and the displacement sensor is used to collect the displacement of the piston rod of the servomotor.

4. The method for calculating the opening of a cylinder valve of a hydropower station according to claim 1, characterized in that: The method further comprises: collecting the oil flow in and out of the rod chamber of the servomotor; Calculating the amount of oil flowing out of the rod chamber of the servomotor within the time interval according to the inflow and outflow oil flow rates of the rod chamber of the servomotor; Calculating a third opening degree of the servomotor within the preset time according to the amount of oil flowing out of the rod chamber of the servomotor within the time interval, the cross-sectional area of ​​the piston rod of the servomotor, and the length of the piston rod of the servomotor; Based on the third openings of the servomotors of the cylinder valve, taking an average value as the third final opening of the cylinder valve within the preset time; The first final opening is verified based on the third final opening, or the third final opening is verified based on the first final opening.

5. The method for calculating the opening of a cylinder valve of a hydropower station according to claim 4, characterized in that: The method further comprises: A first flow meter is provided at the oil inlet and outlet ports of the rodless cavity of the servomotor, and the oil inlet and outlet flows of the rodless cavity of the cylinder valve servomotor are collected by using the first flow meter; A second flow meter is arranged at the oil inlet and outlet ports of the rod chamber of the servomotor, and the oil inlet and outlet flows of the rod chamber of the cylinder valve servomotor are collected by using the second flow meter.

6. The method for calculating the opening of a cylinder valve of a hydropower station according to claim 1, characterized in that: The method further comprises: collecting the inlet and outlet oil temperatures of the rodless cavity of the servomotor; Calculating the temperature difference between the inlet and outlet oil temperatures of the rodless chamber of the servomotor and a preset temperature; Calculating a first oil volume compensation value flowing into the rodless cavity of the servomotor within the time interval according to the temperature difference; The first oil amount compensation value is compensated to the amount of oil flowing into the rodless chamber of the relay during the time interval.

7. The method for calculating the opening of a cylinder valve of a hydropower station according to claim 6, characterized in that: The method further comprises: A temperature sensor is arranged at the oil inlet and outlet ports of the rodless cavity of the servomotor, and the temperature sensor is used to collect the oil inlet and outlet temperatures of the rodless cavity of the servomotor.

8. The method for calculating the opening of a cylinder valve of a hydropower station according to claim 1, characterized in that: The method further comprises: collecting the inlet and outlet oil pressures of the rodless chamber of the servomotor; Calculating the pressure difference between the inlet and outlet oil pressures of the rodless chamber of the servomotor and the preset pressure; Calculating a second oil volume compensation value flowing into the rodless chamber of the servomotor within the time interval according to the pressure difference; The second oil amount compensation value is compensated to the amount of oil flowing into the rodless chamber of the relay during the time interval.

9. The method for calculating the opening of a cylinder valve of a hydropower station according to claim 8, characterized in that: The method further comprises: A pressure sensor is arranged at the oil inlet and outlet ports of the rodless cavity of the servomotor, and the oil inlet and outlet pressures of the rodless cavity of the servomotor are collected by using the pressure sensor.

10. The method for calculating the opening of a cylinder valve of a hydropower station according to claim 1, characterized in that: The method further comprises: Calculating a first opening degree of the servomotor within a preset time based on an opening degree formula; Wherein, the opening formula is: h = HV / S; h is the first opening of the servomotor within a preset time, H is the length of the piston rod of the servomotor, V is the amount of oil flowing into the rodless chamber of the servomotor within the preset time, and S is the cross-sectional area of ​​the piston rod of the servomotor.

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