A correction method for calculating the pumping height of a pumped storage power station in a high-altitude area

Abstract

The application relates to the technical field of pumped storage technology, and discloses a correction method for calculating the suction height of a pumped storage power station in a high-altitude area, which comprises the following steps: obtaining test materials in the power station, a preset ambient temperature, an actual ambient temperature and a preset ambient pressure; based on the preset ambient temperature and the preset ambient pressure, a first test group is divided, and based on the actual ambient temperature and the preset ambient pressure, a second test group is divided; cavitation is generated near the test materials, a first function relationship of the test materials under the first test group and a second function relationship of the test materials under the second test group are obtained; for each second test group, based on the second function relationship of the second test group and the first function relationship of the first test group corresponding to the second test group, the environmental pressure change amount of each second test group is determined; and based on the environmental pressure change amounts of the multiple second test groups, a temperature correction term is determined to correct the calculation of the suction height. According to the application, the suction height can be accurately obtained, and the cavitation safety margin of the unit is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pumped storage technology, in particular to a correction method for calculating the suction height of a pumped storage power station in a high-altitude area. BACKGROUND

[0002] Pumped storage power stations, also known as energy storage type hydropower stations, are a special type of hydropower station. They not only play a key role in the stable operation of power systems and the improvement of energy utilization efficiency, but also are an important technical means for promoting the development of renewable energy and realizing the low-carbon transformation of power systems. Currently, existing pumped storage power stations are mainly built in low-altitude areas, while the number of pumped storage power stations in high-altitude areas (above 3000m) is relatively small. Therefore, how to design and build pumped storage power stations in high-altitude areas has become an important problem that needs to be studied urgently.

[0003] There are significant differences between low-altitude areas and high-altitude areas in the construction of pumped storage power stations. The environmental characteristics of high-altitude areas and low-altitude areas differ greatly, which means that under the same suction height, the cavitation phenomenon of the water turbine in high-altitude areas may be more serious than in low-altitude areas. However, the existing calculation of suction height does not take into account the differences in environmental characteristics between low-altitude areas and high-altitude areas, resulting in large errors in the calculation of suction height, which in turn affects the construction of pumped storage power stations. Therefore, how to modify the existing calculation of suction height according to the environmental characteristics of high-altitude areas is a problem that needs to be solved. SUMMARY

[0004] Therefore, the present application provides a correction method for calculating the suction height of a pumped storage power station in a high-altitude area, to solve the problem that the existing calculation of suction height does not take into account the differences in environmental characteristics between low-altitude areas and high-altitude areas, resulting in large errors in the calculation of suction height, which in turn affects the construction of pumped storage power stations.

[0005] In a first aspect, the present application provides a correction method for calculating the suction height of a pumped storage power station in a high-altitude area, which comprises:

[0006] Obtaining test materials of a water turbine or a pump-turbine in the power station, a preset environmental temperature, an actual environmental temperature, and a plurality of preset environmental pressures;

[0007] Based on the preset environmental temperature and the plurality of preset environmental pressures, a plurality of first test groups are divided, and based on the actual environmental temperature and the plurality of preset environmental pressures, a plurality of second test groups are divided, and the plurality of first test groups and the plurality of second test groups are one-to-one corresponding;

[0008] The cavitation is generated near the test material, a plurality of first function relationships corresponding to the test material under a plurality of first test groups and a plurality of second function relationships corresponding to the test material under a plurality of second test groups are obtained, any first function relationship represents a change trend of a mass loss value of the test material with test time under a preset ambient temperature and any preset ambient pressure, the plurality of first function relationships and the plurality of second function relationships correspond to each other, and any second function relationship represents a change trend of the mass loss value of the test material with the test time under a case that the actual ambient temperature and the preset ambient pressure decrease;

[0009] For each second test group, an ambient pressure change amount of each second test group is determined based on the second function relationship corresponding to the second test group and the first function relationship of the first test group corresponding to the second test group;

[0010] A temperature correction term is determined based on the ambient pressure change amounts of the plurality of second test groups, so as to correct the calculation of the pumping height based on the temperature correction term.

[0011] The method for correcting the pumping height calculation of the pumped storage power station in the high-altitude area provided by the embodiment of the application quantifies the influence of the environmental characteristics on the test material, comprehensively considers the test time, the ambient temperature and the ambient pressure to obtain the change trend of the mass of the test material due to the cavitation corrosion, that is, the first function relationship and the second function relationship, and then obtains the temperature correction term, and introduces the temperature correction term into the pumping height calculation formula to correct the pumping height. Through the correction of the temperature correction term, the value of the pumping height can be accurately obtained, and the preset ambient temperature and the actual ambient temperature are both low temperatures in the high-altitude area, which can inhibit the cavitation effect, and thus the value of the pumping height is improved to a certain extent, the safety margin of the cavitation of the pumped storage power station unit is reduced, and thus the workload and the cost of the construction of the pumped storage power station project are reduced under the premise of ensuring the safe operation of the unit.

[0012] In an alternative embodiment, the cavitation is generated near the test material, comprising:

[0013] The cavitation is generated near the test material based on the ultrasonic generating device in the mass loss test device, so that the test material generates mass loss;

[0014] The ambient pressure is adjusted to any preset ambient pressure based on the air duct and the pressure measuring device in the mass loss test device;

[0015] The ambient temperature is adjusted to the preset ambient temperature based on the temperature adjusting device in the mass loss test device.

[0016] The correction method for calculating the pumping height of the pumped storage power station in the high-altitude area provided by the embodiment of the application can determine the cavitation corrosion degree under different preset environmental conditions by simulating the cavitation environment through the mass loss test device and adjusting the environmental temperature and the environmental pressure.

[0017] In an alternative embodiment, the first function relationship corresponding to each of the first test groups is obtained by:

[0018] The mass loss value of each of the first test groups in the preset time period is obtained under the preset environmental pressure corresponding to each of the first test groups while keeping the preset environmental temperature unchanged.

[0019] The mass loss value in the preset time period obtained for any of the first test groups is subjected to polynomial fitting for a preset number of times to obtain the first function relationship corresponding to the first test group.

[0020] The correction method for calculating the pumping height of the pumped storage power station in the high-altitude area provided by the embodiment of the application can determine the cavitation corrosion degree under different preset environmental conditions by simulating the cavitation environment through the mass loss test device and adjusting the environmental temperature and the environmental pressure.

[0021] In an alternative embodiment, the second function relationship corresponding to each of the second test groups is obtained by:

[0022] The environmental pressure is continuously adjusted during the process of obtaining the second function relationship based on the air pipe and the pressure measuring device in the mass loss test device.

[0023] The environmental temperature is adjusted to the actual environmental temperature based on the temperature adjusting device in the mass loss test device.

[0024] The second function relationship corresponding to each of the second test groups is obtained based on the actual environmental temperature and the changing environmental pressure.

[0025] The correction method for calculating the pumping height of the pumped storage power station in the high-altitude area provided by the embodiment of the application can determine the cavitation corrosion degree under different preset environmental conditions by simulating the cavitation environment through the mass loss test device and adjusting the environmental temperature and the environmental pressure.

[0026] In an alternative embodiment, the second function relationship corresponding to each of the second test groups is obtained by:

[0027] For any second test group, a preset environmental pressure used for obtaining the first function relationship of the corresponding first test group is acquired;

[0028] In the case of keeping the actual environmental temperature unchanged and continuously reducing the preset environmental pressure, the mass loss value of the second test group in the preset time period is acquired;

[0029] For the mass loss value of the second test group in the preset time period, polynomial fitting of a preset number of times is performed to obtain the second function relationship corresponding to the second test group.

[0030] The correction method for calculating the pumping height of the pumped storage power station in the high-altitude area provided by the embodiment of the application obtains the mass change trend of the test material under the new environmental condition by continuously adjusting the environmental pressure while keeping the actual environmental temperature unchanged.

[0031] In an optional implementation, for each second test group, based on the second function relationship corresponding to the second test group and the first function relationship of the first test group corresponding to the second test group, the environmental pressure change amount of each second test group is determined, including:

[0032] For any second test group, based on the second function relationship corresponding to the second test group and the first function relationship of the first test group corresponding to the second test group, at any time in the preset time period, the first mass loss value corresponding to the time of the first function relationship and the second mass loss value corresponding to the time of the second function relationship are determined;

[0033] In the case that the difference between the first mass loss value and the second mass loss value is less than a preset threshold, the target environmental pressure corresponding to the time of the second function relationship is acquired;

[0034] The difference between the preset environmental pressure corresponding to the time of the first function relationship and the target environmental pressure is taken as the environmental pressure change amount of the second test group.

[0035] The correction method for calculating the pumping height of the pumped storage power station in the high-altitude area provided by the embodiment of the application can reflect that, under the actual environmental temperature and the target environmental pressure, the similar or same cavitation corrosion degree can be achieved by reducing the target environmental pressure by the environmental pressure change amount.

[0036] In an optional implementation, the temperature correction term is determined based on the environmental pressure change amounts of the plurality of second test groups, including:

[0037] The weighted average value of the environmental pressure change amounts of the plurality of second test groups is determined;

[0038] The temperature correction term is determined based on the weighted average value, the density of the water body, and the safety factor.

[0039] The correction method for calculating the pumping height of the pumped storage power station in the high-altitude area provided by the embodiment of the present application can more accurately determine the temperature correction term by performing the weighted average on the environmental pressure variation of the multiple second test groups, reduce the test error, and more accurately calculate the pumping height by correcting the pumping height based on the temperature correction term.

[0040] In a second aspect, the present application provides a correction device for calculating the pumping height of the pumped storage power station in the high-altitude area, which comprises:

[0041] A first obtaining module is configured to obtain the test material of the water turbine in the power station, the preset environmental temperature, the actual environmental temperature, and the multiple preset environmental pressures.

[0042] A dividing module is configured to divide the multiple first test groups based on the preset environmental temperature and the multiple preset environmental pressures, divide the multiple second test groups based on the actual environmental temperature and the multiple preset environmental pressures, and make the multiple first test groups and the multiple second test groups one-to-one corresponding.

[0043] A second obtaining module is configured to generate cavitation near the test material, obtain the multiple first function relationships corresponding to the test material under the multiple first test groups and the multiple second function relationships corresponding to the test material under the multiple second test groups, any first function relationship representing the change trend of the mass loss value of the test material with the test time under the preset environmental temperature and any preset environmental pressure, and the multiple first function relationships and the multiple second function relationships one-to-one corresponding, and any second function relationship representing the change trend of the mass loss value of the test material with the test time under the condition that the actual environmental temperature and the preset environmental pressure decrease.

[0044] A third obtaining module is configured to determine the environmental pressure variation of each second test group based on the second function relationship corresponding to the second test group and the first function relationship of the first test group corresponding to the second test group for the second test group.

[0045] A correction module is configured to determine the temperature correction term based on the environmental pressure variation of the multiple second test groups, so as to correct the calculation of the pumping height based on the temperature correction term.

[0046] In a third aspect, the present application provides a computer device, which comprises a memory and a processor, the memory and the processor are communicatively connected with each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the correction method for calculating the pumping height of the pumped storage power station in the high-altitude area according to the first aspect or any of the corresponding embodiments thereof.

[0047] In a fourth aspect, the present application provides a computer readable storage medium, having stored thereon computer instructions for causing a computer to execute the method for correcting the calculation of the pumping height of a pumped storage power station in a high-altitude region according to the first aspect or any of the corresponding embodiments thereof.

[0048] In a fifth aspect, the present application provides a computer program product comprising computer instructions for causing a computer to execute the method for correcting the calculation of the pumping height of a pumped storage power station in a high-altitude region according to the first aspect or any of the corresponding embodiments thereof. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings required to be used in the specific embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0050] Figure 1 is a flow chart of the method for correcting the calculation of the pumping height of a pumped storage power station in a high-altitude region according to an embodiment of the present application;

[0051] Figure 2 is an example diagram of the quality change of the test material of the first test group according to an embodiment of the present application;

[0052] Figure 3 is an example diagram of the quality loss test device according to an embodiment of the present application;

[0053] Figure 4 is a structural block diagram of the correction device for the calculation of the pumping height of a pumped storage power station in a high-altitude region according to an embodiment of the present application;

[0054] Figure 5 is a hardware structure schematic diagram of the computer equipment according to an embodiment of the present application. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0056] The environmental characteristics of high altitude areas have a significant influence on the cavitation performance of hydraulic machinery such as water turbines and pump-turbines, and the low temperature characteristics of high altitude areas will inhibit cavitation and cavitation erosion. Existing research has concluded that a lower reference water temperature will reduce the risk of cavitation erosion at key locations such as turbine blades to a certain extent. However, this conclusion has not been applied to the calculation of the pumping height of pumped storage power stations.

[0057] The conventional pumping height calculation formula currently used is shown in the following formula (1):

[0058]

[0059] Wherein, H S represents the pumping height; represents the altitude value; P V represents the cavitation pressure; H represents the operating water head of the unit; K represents the safety factor; σ m represents the cavitation coefficient of the pump-turbine model; p represents the density of the water; and g represents the acceleration of gravity.

[0060] Existing research has shown that the degree of cavitation corrosion of metal materials is closely related to water temperature, and for most materials, the lower the water temperature, the lower the degree of corrosion caused by cavitation when the water temperature is less than 50℃. Under normal circumstances, the water temperature in the water turbine and pump-turbine of a pumped storage power station is not greater than 30℃, so it can be considered that the lower the water temperature in the water turbine and pump-turbine, the lower the degree of cavitation corrosion. For high altitude areas, if cavitation does not occur or is not severe due to low water temperature, the value of the pumping height can be corrected based on the traditional pumping height calculation to increase the pumping height, thereby reducing the safety margin of cavitation of the unit, reducing the workload of engineering construction and reducing investment under the premise of ensuring safe operation of the unit.

[0061] Therefore, the present embodiment provides a correction method for calculating the pumping height of a pumped storage power station in a high altitude area, which corrects the calculation of the pumping height through a temperature correction term to obtain a more accurate pumping height, thereby improving the construction of pumped storage power stations in high altitude areas.

[0062] According to the embodiment of the present application, a correction method for calculating the pumping height of a pumped storage power station in a high altitude area is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0063] In the present embodiment, a correction method for calculating the pumping height of a pumped storage power station in a high altitude area is provided, which can be used in electronic equipment, Figure 1is a flowchart of a correction method for calculating the suction height of a high-altitude pumped storage power station according to an embodiment of the present application, as shown in Figure 1 The flowchart includes the following steps:

[0064] In step S101, test materials of a hydraulic turbine or a pump-turbine in the power station, a preset ambient temperature, an actual ambient temperature, and a plurality of preset ambient pressures are obtained. Specifically, high-temperature environments are prone to cavitation erosion, but low ambient temperatures can also cause other problems, such as material brittleness or changes in flow characteristics, etc. Therefore, the present embodiment comprehensively considers the inhibitory effect of low temperature on cavitation erosion, the actual working conditions of the pumped storage power station, the equipment parameters in the pumped storage power station, and other factors affecting cavitation erosion, and sets the preset ambient temperature to 20°C. The degree of cavitation corrosion of the test materials at the preset ambient temperature of 20°C is known. It should be noted that the preset ambient temperature is not unique and can be adjusted according to actual needs. The present embodiment does not limit this, but the degree of cavitation corrosion at the preset ambient temperature must be known so that it can be used as a reference benchmark. The plurality of preset ambient pressures can be p v +0.05 MPa, p v +0.10 MPa, p v +0.15 MPa, p v +0.20 MPa, and p v +0.25 MPa, which are only examples and are not limited thereto. Among them, p v represents the saturation vapor pressure of pure water at a preset ambient temperature of 20°C. Since the altitude of the high-altitude area is high, the water temperature of the hydraulic turbine and the pump-turbine in the pumped storage power station is also low, so the actual ambient temperature of the test materials is generally not more than 30°C. By obtaining the test materials, the preset ambient conditions of the test materials, and the actual ambient conditions of the test materials, necessary preparations are made for testing.

[0065] Step S102, based on the preset environment temperature and the plurality of preset environment pressures, the plurality of first test groups are divided, based on the actual environment temperature and the plurality of preset environment pressures, the plurality of second test groups are divided, the plurality of first test groups and the plurality of second test groups are one-to-one correspondence. Specifically, the plurality of first test groups and the plurality of second test groups are one-to-one correspondence, forming a plurality of control test groups. The plurality of first test groups are shown in Table 1 below, the preset environment temperature of each first test group is consistent, and different preset environment pressures are used. Wherein, the preset environment temperature and the plurality of preset environment pressures are exemplified in the above step S101. When dividing the second test group, the second test group is one-to-one corresponding to the first test group, the actual environment temperature used by each second test group is consistent, the initial environment pressure uses the preset environment pressure of the corresponding first test group, and the preset environment pressure is continuously changed during the test. By dividing the plurality of first test groups and the plurality of second test groups, the cavitation erosion degree of the test material under different environment conditions can be determined.

[0066] Table 1

[0067]

[0068] Wherein, P represents the preset environment pressure, and T represents the preset environment temperature.

[0069] Step S103, cavitation is generated near the test material, a plurality of first function relationships corresponding to the test material under the plurality of first test groups and a plurality of second function relationships corresponding to the test material under the plurality of second test groups are obtained, any first function relationship represents the change trend of the mass loss value of the test material with the test time under the preset environment temperature and any preset environment pressure, the plurality of first function relationships and the plurality of second function relationships are one-to-one correspondence, and any second function relationship represents the change trend of the mass loss value of the test material with the test time under the actual environment temperature and the preset environment pressure. Specifically, since cavitation is generated near the test material, cavitation will cause cavitation erosion, so that the test material is corroded due to cavitation erosion, resulting in the mass loss of the test material. Figure 2 is an example diagram of the mass change of the test material of the first test group one according to the embodiment of the application, as Figure 2 shown, t represents the test time. For the first test group one, under the condition that the preset environment temperature is 20℃ and the preset environment pressure is p v +0.05MPa, Figure 2 shows the change of the mass loss value of the test material with the test time. From Figure 2It can be seen that the cavitation erosion degree of the test material is divided into three stages: cavitation erosion initial stage, cavitation erosion development stage and cavitation erosion stable stage. The first function relationship comprehensively considers multiple factors such as test time, environmental temperature and environmental pressure, and obtains the quality change trend of the test material. The second function relationship changes the environmental temperature and the environmental pressure on the basis of the first function relationship as a reference benchmark, and thus obtains a new quality change trend of the test material.

[0070] In step S104, for each second test group, the environmental pressure change amount of each second test group is determined based on the second function relationship corresponding to the second test group and the first function relationship of the first test group corresponding to the second test group. Specifically, since the environmental pressure can directly cause the occurrence of cavitation erosion and it is easier and more accurate to adjust the environmental pressure than to adjust the environmental temperature in actual situations, the environmental temperature of the test material is kept unchanged in the first test group and the second test group in the embodiment of the present application, and the environmental pressure is changed. The second function relationship obtained by any second test group is obtained by changing the preset environmental pressure corresponding to the first function relationship of the first test group corresponding to the second test group under the actual environmental temperature, so that the cavitation erosion degree similar to or the same as the first function relationship can be realized by adjusting the environmental pressure corresponding to the second function relationship by the environmental pressure change amount.

[0071] In step S105, the temperature correction term is determined based on the environmental pressure change amounts of the multiple second test groups, so as to correct the calculation of the draw height based on the temperature correction term. Specifically, since the cavitation erosion degree of the first test group is known and serves as a reference benchmark, the second test group under actual environmental conditions can reach the same or similar cavitation erosion degree as the first test group by adjusting the environmental pressure, and then the adjustable value of the draw height under the actual environmental temperature, i.e. the temperature correction term, can be obtained based on the adjustment value of the environmental pressure of the second test group, so that the conventional draw height calculation formula shown in the above formula (1) can be corrected based on the temperature correction term, and the value of the draw height can be more accurately obtained.

[0072] The correction method for calculating the pumping height of the pumped storage power station in the high-altitude area provided by the embodiment of the present application can accurately obtain the value of the pumping height by quantifying the influence of the environmental characteristics on the test material, comprehensively considering the test time, the environmental temperature and the environmental pressure, obtaining the quality change trend of the test material due to the cavitation corrosion, i.e., the first function relationship and the second function relationship, and then obtaining the temperature correction term, and introducing the temperature correction term into the pumping height calculation formula to correct the pumping height. The preset environmental temperature and the actual environmental temperature are both low temperatures in the high-altitude area, which can inhibit the cavitation effect, and thus to a certain extent, the value of the pumping height is increased, and the safety margin of the cavitation of the pumped storage power station unit is reduced, thereby reducing the workload and cost of the construction of the pumped storage power station under the premise of ensuring the safe operation of the unit.

[0073] In the embodiment, a correction method for calculating the pumping height of a pumped storage power station in a high-altitude area is provided, and the method specifically includes the following steps:

[0074] In step S201, the test material of the water turbine or the pump-turbine in the power station, the preset environmental temperature, the actual environmental temperature and a plurality of preset environmental pressures are obtained. For details, please refer to Figure 1 The step S101 of the embodiment shown in the figure will not be repeated here.

[0075] In step S202, a plurality of first test groups are divided based on the preset environmental temperature and the plurality of preset environmental pressures, and a plurality of second test groups are divided based on the actual environmental temperature and the plurality of preset environmental pressures, and the plurality of first test groups and the plurality of second test groups are one-to-one corresponding. For details, please refer to Figure 1 The step S102 of the embodiment shown in the figure will not be repeated here.

[0076] In step S203, cavitation is generated near the test material, a plurality of first function relationships corresponding to the test material under a plurality of first test groups and a plurality of second function relationships corresponding to the test material under a plurality of second test groups are obtained, any first function relationship represents the change trend of the mass loss value of the test material with the test time under the preset environmental temperature and any preset environmental pressure, the plurality of first function relationships and the plurality of second function relationships are one-to-one corresponding, and any second function relationship represents the change trend of the mass loss value of the test material with the test time under the actual environmental temperature and the preset environmental pressure.

[0077] Specifically, the step S203 of generating cavitation near the test material includes:

[0078] In step S2031, cavitation is generated near the test material based on the ultrasonic generating device in the mass loss test device, so that the test material generates mass loss. Specifically, Figure 3is an example diagram of a mass loss test device according to an embodiment of the present application, as shown in Figure 3 The mass loss test device includes an ultrasonic generating device, an air duct, a pressure measuring device, and a temperature regulating device. Before the test begins, the test material is placed in the water body of the mass loss test device, and cavitation is generated near the test material by the ultrasonic generating device to simulate the flow of water through the water turbine or pump-turbine in the pumped storage power station during actual use, which may cause cavitation erosion and thus corrosion of the test material, resulting in a decrease in mass.

[0079] In step S2032, the ambient pressure is adjusted to any preset ambient pressure based on the air duct and the pressure measuring device in the mass loss test device. Specifically, referring to Figure 3 When the test is performed in any first test group, the internal and external exchange of gas is achieved through the air duct in the mass loss test device, and the pressure inside the device is measured by the pressure measuring device, so that the ambient pressure inside the device is adjusted to the preset ambient pressure used by the first test group.

[0080] In step S2033, the ambient temperature is adjusted to a preset ambient temperature based on the temperature regulating device in the mass loss test device. Specifically, referring to Figure 3 When the test is performed in any first test group, the ambient temperature inside the device is adjusted to the preset ambient temperature used by the first test group by the temperature regulating device in the mass loss test device. By performing the test using the mass loss test device, the cavitation corrosion degree of the test material under different preset ambient conditions can be observed.

[0081] Specifically, the above step S203 obtains a plurality of first function relationships of the test material under a plurality of first test groups, including:

[0082] In step S2034, the preset ambient temperature is kept unchanged, and the mass loss value of each first test group is obtained under the corresponding preset ambient pressure in a preset time period. Specifically, for the first test group one, referring to Figure 2 the change curve of the test material, the mass loss value from test time t1 to test time t2 is obtained in the cavitation stable stage of the test material, and the preset time period is from test time t1 to test time t2. For the first test group two to the first test group five, the mass loss value in the preset time period is obtained in the cavitation stable stage of the test material. It should be noted that the preset time period is only limited in the cavitation stable stage, and the length, start time and end time of the preset time period are not limited, but in order to ensure the rigor of the test, the preset time periods of all first test groups are consistent.

[0083] Step S2035: For any mass loss value obtained from the first test group within a preset time period, perform a polynomial fitting of a preset degree to obtain the first functional relationship corresponding to the first test group. Specifically, the preset degree is usually set to a positive integer not greater than 4, but can be adjusted according to actual needs; this embodiment of the invention does not impose any restrictions on this. By performing multiple polynomial fittings on the mass loss value within the preset time period, the mass change trend of the test material, which integrates multiple factors such as test time, ambient temperature, and ambient pressure, can be obtained, i.e., the first functional relationship. Since the first test group that obtained the first functional relationship used a preset ambient temperature with a known degree of cavitation corrosion, this first functional relationship can be used as a reference benchmark for judging the degree of cavitation corrosion.

[0084] Specifically, step S203 above obtains multiple second function relationships corresponding to the test materials under multiple second test groups, including:

[0085] Step S2036: Based on the ventilation pipe and pressure measuring device in the mass loss test apparatus, the ambient pressure is continuously adjusted during the acquisition of multiple second function relationships. Specifically, for any second test group, the following is adopted: Figure 3 The mass loss testing apparatus shown continuously lowers the preset environmental pressure corresponding to the second test group through a ventilation pipe and a pressure measuring device. Taking the second test group as an example, as shown in Table 1 above, the preset environmental pressure of the first test group, which forms a control test with the second test group, is p. v +0.05MPa, continuously reduce this preset environmental pressure p v +0.05 MPa yields the environmental pressure for the second test group, and the downward adjustment can be set to a linear, equally spaced change. For example, p v +0.04MPa, p v +0.03MPa, p v +0.02MPa, etc.

[0086] Step S2037: Based on the temperature control device in the mass loss test apparatus, adjust the ambient temperature to the actual ambient temperature. Specifically, using... Figure 3 The mass loss test device shown uses a temperature control device to adjust the ambient temperature from the preset ambient temperature to the actual ambient temperature.

[0087] Step S2038: Based on the actual ambient temperature and changing ambient pressure, obtain multiple second function relationships corresponding to the test materials under multiple second test groups.

[0088] Specifically, step S2038 includes:

[0089] Step a1, for any second test group, obtain the preset environmental pressure used by the first test group corresponding to the second test group to obtain the first function relationship. Specifically, by obtaining the preset environmental pressure, a reference is provided for subsequent adjustment of the environmental pressure of the second function relationship to achieve the cavitation erosion degree corresponding to the first function relationship.

[0090] Step a2, under the condition that the actual environmental temperature remains unchanged and the preset environmental pressure continues to decrease, obtain the mass loss value of the second test group within the preset time period. Specifically, for any second test group, the preset environmental pressure is gradually decreased according to the down-regulation amplitude in step S2036 while the actual environmental temperature remains unchanged, and the preset time period consistent with step S2034 is selected to obtain the mass loss value of the second test group within the preset time period.

[0091] Step a3, for the mass loss value within the preset time period obtained by the second test group, polynomial fitting is performed for a preset number of times to obtain the second function relationship corresponding to the second test group. Specifically, the preset number is usually set to a positive integer not greater than 4, which can also be adjusted according to actual needs, and the present embodiment does not limit this. By performing multiple polynomial fitting on the mass loss value within the preset time period, the trend of the new mass change of the test material under the condition of the actual environmental temperature and the change of the preset environmental pressure, i.e., the second function relationship, can be obtained.

[0092] Step S204, for each second test group, based on the second function relationship corresponding to the second test group and the first function relationship of the first test group corresponding to the second test group, determine the environmental pressure change amount of each second test group.

[0093] Specifically, the above step S204 includes:

[0094] Step S2041, for any second test group, based on the second function relationship corresponding to the second test group and the first function relationship of the first test group corresponding to the second test group, at any time within the preset time period, determine the first mass loss value corresponding to the time of the first function relationship and the second mass loss value corresponding to the time of the second function relationship. Specifically, at any time within the preset time period, by determining the mass loss values of the two function relationships at that time, the difference in cavitation erosion degree of the test material under different environmental conditions can be reflected.

[0095] Step S2042, in the case that the difference between the first mass loss value and the second mass loss value is less than the preset threshold value, obtaining the target environment pressure corresponding to the time point according to the second function relationship. Specifically, since the cavitation erosion degree of the first test group at the preset environment temperature 20℃ is known and is taken as a reference benchmark in the embodiment of the present application, although the actual environment temperature and the preset environment temperature can not be the same, the environment pressure of the second test group can be adjusted to the target environment pressure, so as to achieve a similar or the same cavitation erosion degree as the first test group. Since the mass loss value can reflect the cavitation erosion degree, and the cavitation erosion degrees of the second test group and the first test group are the same or similar after adjusting the environment pressure, that is, the difference between the mass loss values corresponding to the function relationship of the two test groups is less than the preset threshold value at this time.

[0096] Step S2043, taking the difference between the preset environment pressure corresponding to the time point according to the first function relationship and the target environment pressure as the environment pressure change amount of the second test group. Specifically, by reducing the target environment pressure corresponding to the second function relationship by the environment pressure change amount, the same or similar cavitation erosion degree as the first function relationship can be achieved.

[0097] Step S205, determining a temperature correction term based on the environment pressure change amounts of the plurality of second test groups, so as to correct the calculation of the draft height based on the temperature correction term.

[0098] Specifically, the step S205 of determining the temperature correction term based on the environment pressure change amounts of the plurality of second test groups comprises:

[0099] Step S2051, determining a weighted average value of the environment pressure change amounts of the plurality of second test groups. Specifically, the weighted average of the environment pressure change amounts of the plurality of second test groups can more accurately determine the temperature correction term and reduce the test error. The weight corresponding to each second test group can be set by itself, and the embodiment of the present application does not limit this.

[0100] Step S2052, determining the temperature correction term based on the weighted average value, the density of the water body and the safety coefficient. Specifically, the temperature correction term can be determined by the following formula (2), and the calculation of the draft height is corrected by determining the temperature correction term, which can more accurately calculate the draft height.

[0101]

[0102] Wherein, ΔS represents the temperature correction term; K represents the safety coefficient; ΔP represents the weighted average value; ρ represents the density of the water body; g represents the acceleration of gravity.

[0103] In some optional embodiments, after the calculation of the draft height is corrected based on the temperature correction term, the obtained draft height correction formula is:

[0104]

[0105] wherein, H s represents the suction height; represents the altitude value; P v represents the cavitation pressure; p represents the density of the water body; g represents the acceleration of gravity; sigma m represents the cavitation coefficient of the water pump turbine model; H represents the operating head of the unit; K represents the safety factor; and Delta P represents the weighted average value.

[0106] The correction method for calculating the suction height of the pumped storage power station in the high-altitude area provided by the embodiment of the present application can accurately obtain the value of the suction height by quantifying the influence of the environmental characteristics on the test material, comprehensively considering multiple factors such as test time, environmental temperature and environmental pressure to obtain the quality change trend of the test material due to the cavitation corrosion, that is, the first function relationship and the second function relationship, and then obtaining the temperature correction term, and introducing the temperature correction term into the suction height calculation formula to correct the suction height. The correction of the temperature correction term can accurately obtain the value of the suction height, and the preset environmental temperature and the actual environmental temperature are both low temperatures in the high-altitude area, which can inhibit the cavitation effect, and thus to a certain extent, the value of the suction height is increased, the safety margin of the cavitation of the pumped storage power station unit is reduced, thereby reducing the workload and cost of the construction of the pumped storage power station under the premise of ensuring the safe operation of the unit.

[0107] In the embodiment, a correction device for calculating the suction height of the pumped storage power station in the high-altitude area is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and will not be described again. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware or a combination of software and hardware is also possible and is contemplated.

[0108] The embodiment provides a correction device for calculating the suction height of the pumped storage power station in the high-altitude area, as shown in Figure 4 , comprising:

[0109] The first acquisition module 401 is configured to acquire the test material of the water turbine in the power station, the preset environmental temperature, the actual environmental temperature and the plurality of preset environmental pressures.

[0110] The division module 402 is configured to divide a plurality of first test groups based on the preset environmental temperature and the plurality of preset environmental pressures, divide a plurality of second test groups based on the actual environmental temperature and the plurality of preset environmental pressures, and the plurality of first test groups and the plurality of second test groups are in one-to-one correspondence.

[0111] The second acquisition module 403 is configured to generate cavitation near the test material, and acquire a plurality of first function relationships corresponding to a plurality of first test groups and a plurality of second function relationships corresponding to a plurality of second test groups. Any first function relationship represents a change trend of a mass loss value of the test material with respect to a test time under a preset environmental temperature and any preset environmental pressure. The plurality of first function relationships and the plurality of second function relationships correspond to each other. Any second function relationship represents a change trend of the mass loss value of the test material with respect to the test time under a case that the actual environmental temperature and the preset environmental pressure decrease.

[0112] The third acquisition module 404 is configured to, for each second test group, determine an environmental pressure change amount of the second test group based on the second function relationship corresponding to the second test group and the first function relationship of the first test group corresponding to the second test group.

[0113] The correction module 405 is configured to determine a temperature correction term based on the environmental pressure change amounts of the plurality of second test groups, so as to correct the calculation of the suction height based on the temperature correction term.

[0114] In some optional embodiments, the second acquisition module 403 includes:

[0115] The cavitation unit is configured to generate cavitation near the test material based on the ultrasonic generating device in the mass loss test device, so as to cause the test material to generate mass loss.

[0116] The first adjusting unit is configured to adjust the environmental pressure to any preset environmental pressure based on the air duct and the pressure measuring device in the mass loss test device.

[0117] The second adjusting unit is configured to adjust the environmental temperature to the preset environmental temperature based on the temperature adjusting device in the mass loss test device.

[0118] In some optional embodiments, the second acquisition module 403 includes:

[0119] The first acquisition unit is configured to keep the preset environmental temperature unchanged, and acquire a mass loss value of each first test group in a preset time period under a preset environmental pressure corresponding to each first test group, respectively.

[0120] The second acquisition unit is configured to perform polynomial fitting on the mass loss value in the preset time period obtained for any first test group for a preset number of times, to obtain the first function relationship corresponding to the first test group.

[0121] In some optional embodiments, the second acquisition module 403 includes:

[0122] The third acquisition unit is configured to continuously adjust the ambient pressure in the process of acquiring the plurality of second function relationships based on the air duct and the pressure measuring device in the mass loss test device.

[0123] The third adjustment unit is configured to adjust the ambient temperature to the actual ambient temperature based on the temperature adjustment device in the mass loss test device.

[0124] The fourth acquisition unit is configured to acquire a plurality of second function relationships corresponding to the test material under a plurality of second test groups based on the actual ambient temperature and the changed ambient pressure.

[0125] In some optional embodiments, the fourth acquisition unit comprises:

[0126] The first acquisition sub-unit is configured to, for any second test group, acquire a preset ambient pressure used when the first function relationship of the first test group corresponding to the second test group is obtained.

[0127] The second acquisition sub-unit is configured to, in a case where the actual ambient temperature is kept unchanged and the preset ambient pressure is continuously reduced, acquire the mass loss value of the second test group within a preset time period.

[0128] The third acquisition sub-unit is configured to, for the mass loss value of the second test group within the preset time period, perform polynomial fitting for a preset number of times to obtain the second function relationship corresponding to the second test group.

[0129] In some optional embodiments, the third acquisition module 404 comprises:

[0130] The fifth acquisition unit is configured to, for any second test group, based on the second function relationship corresponding to the second test group and the first function relationship of the first test group corresponding to the second test group, determine, at any time within a preset time period, a first mass loss value corresponding to the time in the first function relationship and a second mass loss value corresponding to the time in the second function relationship.

[0131] The sixth acquisition unit is configured to, in a case where the difference between the first mass loss value and the second mass loss value is less than a preset threshold, acquire a target ambient pressure corresponding to the time in the second function relationship.

[0132] The first determination unit is configured to take the difference between the preset ambient pressure corresponding to the time in the first function relationship and the target ambient pressure as the ambient pressure change amount of the second test group.

[0133] In some optional embodiments, the correction module 405 comprises:

[0134] The second determination unit is configured to determine a weighted average value of the ambient pressure change amounts of the plurality of second test groups.

[0135] The third determining unit is used to determine the temperature correction term based on the weighted average value, the density of the water body, and the safety factor.

[0136] Further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0137] In this embodiment, the correction device for calculating the suction height of the pumped storage power station in high-altitude areas is presented in the form of a functional unit. Here, a unit refers to an ASIC (Application Specific Integrated Circuit), a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0138] This invention also provides a computer device having the above-described features. Figure 4 The diagram shows a correction device for calculating the suction height of a pumped storage power station in a high-altitude region.

[0139] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of a computer device provided in an optional embodiment of the present invention, such as... Figure 5 As shown, the computer device includes one or more processors 10, memory 20, and interfaces for connecting the components, including high-speed interfaces and low-speed interfaces. The components communicate with each other via different buses and can be mounted on a common motherboard or otherwise installed as needed. The processors can process instructions executed within the computer device, including instructions stored in or on memory to display graphical information of a GUI on external input / output devices (such as display devices coupled to the interfaces). In some alternative implementations, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple computer devices can be connected, each providing some of the necessary operations (e.g., as a server array, a group of blade servers, or a multiprocessor system). Figure 5 Take a processor 10 as an example.

[0140] Processor 10 may be a central processing unit, a network processor, or a combination thereof. Processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GDA), or any combination thereof.

[0141] The memory 20 stores instructions executable by at least one processor 10 to cause the at least one processor 10 to perform the method shown in the above embodiments.

[0142] The memory 20 can include a program storage area and a data storage area. The program storage area can store an operating system, application programs required for at least one function, etc. The data storage area can store data created according to the use of the computer device, etc. The memory 20 can include a volatile memory such as a random access memory, and can also include a non-volatile memory such as at least one disk storage device, a flash memory device, or other non-volatile solid state memory device. In some alternative embodiments, the memory 20 can optionally include memory that is remotely located with respect to the processor 10, and which can be connected to the computer device through a network. Examples of such networks include, but are not limited to, the Internet, an enterprise intranet, a local area network, a mobile communications network, and combinations thereof.

[0143] The memory 20 can include a volatile memory such as a random access memory, and can also include a non-volatile memory such as at least one disk storage device, a flash memory device, or other non-volatile solid state memory device.

[0144] The computer device also includes a communication interface 30 for communicating with other devices or communication networks.

[0145] The embodiments of the present application also provide a computer readable storage medium, and the method according to the embodiments of the present application can be implemented in hardware, firmware, or recorded in a storage medium, or be implemented as computer code stored in a remote storage medium or non-transitory machine readable storage medium and stored in a local storage medium after being downloaded through a network, so that the method described herein can be processed by such software on a storage medium using a general purpose computer, a special purpose processor, or programmable or special purpose hardware. The storage medium can be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, or a solid state disk, etc. Further, the storage medium can also include a combination of the above-mentioned kinds of memories. It can be understood that the computer, processor, microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code, when the software or computer code is accessed and executed by the computer, processor, or hardware, the method shown in the above embodiments is implemented.

[0146] Part of the present application can be applied as a computer program product, for example, computer program instructions, when executed by a computer, through the operation of the computer, can invoke or provide the method and / or technical solutions according to the present application. Those skilled in the art should understand that the form of computer program instructions in computer readable medium includes but is not limited to source files, executable files, installation package files and the like, and accordingly, the way of computer program instructions executed by computer includes but is not limited to: the computer directly executes the instructions, or the computer compiles the instructions and then executes the corresponding compiled program, or the computer reads and executes the instructions, or the computer reads and installs the instructions and then executes the corresponding installed program. Here, the computer readable medium can be any available computer readable storage medium or communication medium accessible to the computer.

[0147] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A correction method for calculating the suction height of a pumped-storage power station in high-altitude areas, characterized in that, The method includes: Obtain the test materials, preset ambient temperature, actual ambient temperature, and multiple preset ambient pressures for the turbines or pump-turbines in the power station; Based on the preset ambient temperature and the multiple preset ambient pressures, multiple first test groups are divided, and based on the actual ambient temperature and the multiple preset ambient pressures, multiple second test groups are divided, with each of the multiple first test groups and the multiple second test groups corresponding one-to-one. Cavitation is generated near the test material, and multiple first functional relationships corresponding to the test material under multiple first test groups and multiple second functional relationships corresponding to the test material under multiple second test groups are obtained. Any first functional relationship represents the trend of the mass loss value of the test material with test time under a preset ambient temperature and a preset ambient pressure. The multiple first functional relationships and multiple second functional relationships are in one-to-one correspondence. Any second functional relationship represents the trend of the mass loss value of the test material with test time when the actual ambient temperature and the preset ambient pressure decrease. For each second test group, the change in environmental pressure for each second test group is determined based on the second functional relationship corresponding to the second test group and the first functional relationship corresponding to the first test group. A temperature correction term is determined based on the environmental pressure changes of the multiple second test groups, so that the suction height calculation is corrected based on the temperature correction term. The determination of the temperature correction term based on the environmental pressure changes of the plurality of second test groups includes: Determine the weighted average of the environmental pressure changes in the multiple second test groups; The temperature correction term is determined based on the weighted average value, the density of the water, and the safety factor. The temperature correction term is calculated using the following formula: in, Indicates the temperature correction term; Indicates the safety factor; This represents the weighted average. Indicates the density of water; It represents the acceleration due to gravity.

2. The method according to claim 1, characterized in that, The generation of cavitation near the test material includes: Based on the ultrasonic generating device in the mass loss testing device, cavitation is generated near the test material, causing the test material to lose mass. Based on the ventilation pipe and pressure measuring device in the mass loss test device, adjust the ambient pressure to any preset ambient pressure; The ambient temperature is adjusted to the preset ambient temperature using the temperature control device in the mass loss test apparatus.

3. The method according to claim 1, characterized in that, The step of obtaining the multiple first function relationships corresponding to the test materials under the multiple first test groups includes: Keeping the preset ambient temperature constant, under the preset ambient pressure corresponding to each first test group, the mass loss value of each first test group within a preset time period is obtained respectively. For any mass loss value obtained from the first experimental group within a preset time period, perform a polynomial fitting of a preset number of iterations to obtain the first functional relationship corresponding to the first experimental group.

4. The method according to claim 2, characterized in that, The step of obtaining the multiple second function relationships corresponding to the test materials under the multiple second test groups includes: Based on the ventilation pipe and pressure measuring device in the mass loss test device, the ambient pressure is continuously adjusted during the process of obtaining the multiple second function relationships; Based on the temperature control device in the mass loss test apparatus, the ambient temperature is adjusted to the actual ambient temperature; Based on the actual ambient temperature and changing ambient pressure, multiple second function relationships corresponding to the test material under the multiple second test groups are obtained.

5. The method according to claim 4, characterized in that, The process of obtaining multiple second function relationships for the test material under the multiple second test groups based on the actual ambient temperature and changing ambient pressure includes: For any second experimental group, obtain the preset environmental pressure used when the first experimental group corresponding to the second experimental group obtains the first functional relationship; While keeping the actual ambient temperature constant and continuously reducing the preset ambient pressure, the mass loss value of the second test group within a preset time period is obtained. For the mass loss values ​​obtained from the second experimental group within a preset time period, a polynomial fitting of a preset number of iterations is performed to obtain the second functional relationship corresponding to the second experimental group.

6. The method according to claim 1, characterized in that, For each second test group, based on the second functional relationship corresponding to the second test group and the first functional relationship corresponding to the first test group, the environmental pressure change of each second test group is determined, including: For any second test group, based on the second functional relationship corresponding to the second test group and the first functional relationship corresponding to the first test group, at any time within a preset time period, determine the first mass loss value corresponding to the first functional relationship at that time and the second mass loss value corresponding to the second functional relationship at that time. If the difference between the first mass loss value and the second mass loss value is less than a preset threshold, the target environmental pressure corresponding to the second functional relationship at the time is obtained; The difference between the preset environmental pressure and the target environmental pressure corresponding to the first functional relationship at the specified time is taken as the environmental pressure change of the second test group.

7. A correction device for calculating the suction height of a pumped-storage power station in a high-altitude area, characterized in that, The device includes: The first acquisition module is used to acquire the test materials, preset ambient temperature, actual ambient temperature and multiple preset ambient pressures of the turbine in the power station; The division module is used to divide multiple first test groups based on the preset ambient temperature and the multiple preset ambient pressures, and to divide multiple second test groups based on the actual ambient temperature and the multiple preset ambient pressures, wherein the multiple first test groups and the multiple second test groups correspond one-to-one; The second acquisition module is used to generate cavitation near the test material, acquire multiple first function relationships corresponding to the test material under multiple first test groups and multiple second function relationships corresponding to the test material under multiple second test groups, wherein any first function relationship represents the trend of the mass loss value of the test material with test time under a preset ambient temperature and a preset ambient pressure, the multiple first function relationships and the multiple second function relationships are in one-to-one correspondence, and any second function relationship represents the trend of the mass loss value of the test material with test time when the actual ambient temperature and the preset ambient pressure decrease; The third acquisition module is used to determine the change in environmental pressure for each second test group based on the second functional relationship corresponding to the second test group and the first functional relationship corresponding to the first test group. The correction module is used to determine a temperature correction term based on the environmental pressure changes of the plurality of second test groups, so as to correct the suction height calculation based on the temperature correction term. Specifically, the correction module is used for: Determine the weighted average of the environmental pressure changes in the multiple second test groups; The temperature correction term is determined based on the weighted average value, the density of the water, and the safety factor. The temperature correction term is calculated using the following formula: in, Indicates the temperature correction term; Indicates the safety factor; This represents the weighted average. Indicates the density of water; It represents the acceleration due to gravity.

8. A computer device, characterized in that, include: The system includes a memory and a processor, which are interconnected. The memory stores computer instructions, and the processor executes the computer instructions to perform the correction method for calculating the suction height of a pumped storage power station in high-altitude areas as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to execute the correction method for calculating the suction height of a pumped storage power station in high-altitude areas, as described in any one of claims 1 to 6.

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