Pumped storage power station unit water supply system and sand-avoiding water supply method

Abstract

The invention provides a pumped storage power station unit water supply system and a sand-avoiding water supply method, the water supply system comprises: a main shaft seal water supply pipeline, one end of which is connected with an upper reservoir and the other end of which is connected with a unit; the low-pressure water supply pipeline is connected with the lower reservoir, and a first control valve is arranged at the position, close to the lower reservoir, of the low-pressure water supply pipeline; the main transformer water supply pipeline is connected with the low-pressure water supply pipeline and located on the side, away from the lower reservoir, of the first control valve; the leakage drainage pump water supply pipeline is connected with the low-pressure water supply pipeline and located on the side, away from the lower reservoir, of the first control valve; one end of the sand-avoiding water supply pipeline is connected with the spindle sealing water supply pipeline, the other end of the sand-avoiding water supply pipeline is connected with the low-pressure water supply pipeline and located on the side, away from the lower reservoir, of the first control valve, and a second control valve is arranged on the sand-avoiding water supply pipeline. The pumped storage power station unit water supply system and the sand-avoiding water supply method are simple, convenient and low in operation and maintenance cost, and the safety of the power station during sand-avoiding operation can be ensured.

Description

Technical Field

[0001] The present application relates to the field of pumped storage power station control technology, and in particular to a pumped storage power station unit water supply system and a sand-avoiding water supply method. Background Art

[0002] Pumped storage is the use of electricity during the low load period to pump water to the upper reservoir, and then release the water stored in the upper reservoir to the lower reservoir for power generation during the peak load period, also known as energy storage power generation. It can convert the excess electricity during the low load period of the power grid into high-value electricity during the high load period of the power grid, suitable for frequency and phase modulation, can be used to stabilize the frequency and voltage of the power system, and is suitable for emergency standby, and can also improve the efficiency of thermal power plants and nuclear power plants in the power system.

[0003] Pumped-storage power stations are mostly located in mountainous areas. When heavy rains suddenly hit the river basin, a large amount of sediment is washed into the river by the rain. The larger particles of sediment are very destructive to the main and auxiliary machines of the hydro-turbine generator set, forcing the unit to shut down to avoid sand. However, after avoiding sand, the power station still needs to meet some basic water supply guarantees to avoid safety accidents. For example, the main transformer of the power station needs to maintain a suitable temperature at all times to ensure the electricity supply of the entire power station, and the seepage water from the mountain is constantly accumulating and needs to be discharged in time.

[0004] The existing technology uses the water source of the reservoir under the power station for the cooling water of the main transformer and the lubricating water of the leakage drainage pump. As mentioned above, a large amount of sediment will cause the main transformer to be blocked or damage the leakage drainage pump, making it impossible to maintain the basic operation of the power station. It can be considered to excavate a special reservoir in the underground plant or other suitable locations on the mountain to store enough clean water before the flood season to ensure basic water supply, but this method has high excavation and maintenance costs, and the underground plant space or mountain terrain has hard restrictions, which is not easy to meet the excavation conditions. Therefore, there is an urgent need for a low-cost and efficient solution to maintain basic water supply when the unit avoids sand. Summary of the invention

[0005] In view of this, the purpose of the present application is to propose a water supply system for a pumped storage power station unit and a sand-avoiding water supply method to solve the related problems mentioned in the background technology.

[0006] In a first aspect of the present application, a water supply system for a pumped-storage power station unit is provided, comprising: a main shaft seal water supply pipeline, one end of which is connected to the upper reservoir of the pumped-storage power station, and the other end is connected to the unit, for supplying water to the main shaft of the unit; a low-pressure water supply pipeline, connected to the lower reservoir of the pumped-storage power station, a first control valve being provided at a position of the low-pressure water supply pipeline close to the lower reservoir, the first control valve being used to control the opening and closing of the water supply from the lower reservoir to the low-pressure water supply pipeline; a main transformer water supply pipeline, connected to the low-pressure water supply pipeline, and located at a position where the first control valve is far away from the lower reservoir The first control valve is located on one side of the lower reservoir, and is used to supply water to the main transformer of the pumped-storage power station; the leakage drainage pump water supply pipeline is connected to the low-pressure water supply pipeline, is located on the side of the first control valve away from the lower reservoir, and is used to supply water to the leakage drainage pump of the pumped-storage power station; the sand-avoiding water supply pipeline is connected to the main shaft sealing water supply pipeline at one end and connected to the low-pressure water supply pipeline at the other end, and is located on the side of the first control valve away from the lower reservoir, and a second control valve is provided on the sand-avoiding water supply pipeline, and the second control valve is used to control the opening and closing of the main shaft sealing water supply pipeline to supply water to the low-pressure water supply pipeline.

[0007] Furthermore, the sand-avoiding water supply pipeline is provided with the second control valve, the first pressure gauge, the filter, the pressure reducing valve, the second pressure gauge and the third control valve in sequence. The second control valve is arranged close to the main transformer water supply pipeline. The third control valve is used to control the opening and closing of the main shaft seal water supply pipeline to supply water to the low-pressure water supply pipeline.

[0008] Furthermore, a fourth control valve and a fifth control valve are provided on the main shaft sealing water supply pipeline. The fourth control valve is arranged close to the upper reservoir. The fourth control valve and the fifth control valve are used to control the opening and closing of the water supply from the upper reservoir to the main shaft sealing water supply pipeline. The sand-avoiding water supply pipeline is connected between the fourth control valve and the fifth control valve.

[0009] Furthermore, the water supply system of the pumped-storage power station unit also includes: an air compressor water supply pipeline, connected to the low-pressure water supply pipeline, located on the side of the first control valve away from the lower reservoir, and used to supply water to the air compressor of the pumped-storage power station; a static frequency converter water supply pipeline, connected to the low-pressure water supply pipeline, located on the side of the first control valve away from the lower reservoir, and used to supply water to the static frequency converter of the pumped-storage power station.

[0010] The second aspect of the present application provides a method for avoiding sand and supplying water to a pumped-storage power station unit, using the pumped-storage power station unit water supply system as described in the first aspect above, and the method for avoiding sand and supplying water to a pumped-storage power station unit includes: obtaining the real-time inflow sand content of the lower reservoir; when the real-time inflow sand content is greater than or equal to the preset sand content, opening the second control valve and closing the first control valve, so that the upper reservoir supplies water to the main transformer water supply pipeline and the leakage drainage pump water supply pipeline.

[0011] Furthermore, the sand-avoiding water supply method for the pumped-storage power station unit also includes: obtaining the inflow water flow of the lower reservoir after rainfall at the location of the pumped-storage power station; when the inflow water flow is greater than or equal to a preset flow, opening the second control valve and closing the first control valve.

[0012] Furthermore, the opening of the second control valve then includes: reducing the water pressure in the pipeline to below a preset pressure through a pressure reducing valve of the sand-avoiding water supply pipeline.

[0013] Furthermore, the obtaining of the inflow water flow of the lower reservoir includes: obtaining real-time precipitation at the location of the pumped-storage power station; when the real-time precipitation is greater than or equal to a preset precipitation, obtaining the inflow water flow of the lower reservoir.

[0014] Furthermore, the obtaining of the inflow water flow of the lower reservoir comprises: obtaining the precipitation time at the location of the pumped-storage power station; when the precipitation time is greater than or equal to a preset time, obtaining the inflow water flow of the lower reservoir.

[0015] Furthermore, the obtaining of the inflow water flow rate of the lower reservoir includes: obtaining the water level of the lower reservoir; when the water level is greater than or equal to a preset height, obtaining the inflow water flow rate of the lower reservoir.

[0016] The third aspect of the present application provides a pumped-storage power station unit sand-avoiding water supply device, using the pumped-storage power station unit water supply system as described in the first aspect above, the pumped-storage power station unit sand-avoiding water supply device includes: an acquisition module, configured to obtain the real-time inflow sand content of the lower reservoir; a control module, configured to open the second control valve and close the first control valve when the real-time inflow sand content is greater than or equal to the preset sand content, so that the upper reservoir supplies water to the main transformer water supply pipeline and the leakage drainage pump water supply pipeline.

[0017] In a fourth aspect of the present application, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for avoiding sand and supplying water to a pumped-storage power station unit as described in the second aspect above is implemented.

[0018] In a fifth aspect of the present application, a non-transitory computer-readable storage medium is provided, wherein the non-transitory computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the sand-avoiding water supply method for a pumped-storage power station unit as described in the second aspect above.

[0019] In a sixth aspect of the present application, a computer program product is provided, comprising computer program instructions, characterized in that when the computer program instructions are executed on a computer, the computer is enabled to execute the sand-avoiding water supply method for a pumped-storage power station unit as described in the second aspect above.

[0020] As can be seen from the above, the present application provides a water supply system for a pumped-storage power station unit and a sand-avoiding water supply method, wherein the water supply system for a pumped-storage power station unit comprises: a main shaft sealing water supply pipeline, one end of which is connected to the upper reservoir of the pumped-storage power station, and the other end is connected to the unit, for supplying water to the main shaft of the unit; a low-pressure water supply pipeline, connected to the lower reservoir of the pumped-storage power station, a first control valve is provided at a position of the low-pressure water supply pipeline near the lower reservoir, and the first control valve is used to control the opening and closing of the water supply from the lower reservoir to the low-pressure water supply pipeline; a main transformer water supply pipeline, connected to the low-pressure water supply pipeline The first control valve is located on the side of the first control valve away from the lower reservoir, and is used to supply water to the main transformer of the pumped storage power station; the leakage drainage pump water supply pipeline is connected to the low-pressure water supply pipeline, and is located on the side of the first control valve away from the lower reservoir, and is used to supply water to the leakage drainage pump of the pumped storage power station; the sand-avoiding water supply pipeline is connected to the main shaft seal water supply pipeline at one end and the low-pressure water supply pipeline at the other end, and is located on the side of the first control valve away from the lower reservoir. A second control valve is provided on the sand-avoiding water supply pipeline, and the second control valve is used to control the opening and closing of the main shaft seal water supply pipeline to the low-pressure water supply pipeline. By adding a sand-avoiding water supply pipeline, the upper reservoir connected to the main shaft seal water supply pipeline can be used to supply water to the main transformer water supply pipeline and the leakage drainage pump water supply pipeline when the unit is shut down for sand-avoiding. The sand content of the water in the upper reservoir is low. After testing, it can ensure the long-term stable operation of the main transformer and the leakage drainage pump, and ensure the safety of the power station during sand-avoiding operation; compared with the design of a single clean water source reservoir, it can greatly reduce costs. The pumped storage power station unit water supply system and the sand-avoiding water supply method are simple and convenient, with low operation and maintenance costs, and can ensure the safety of the power station during sand-avoiding operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 This is a schematic diagram of the pipeline connection of a water supply system for a pumped-storage power station unit in an embodiment of the present application;

[0023] Figure 2 It is a schematic diagram of the structure of the filter and the pressure reducing valve;

[0024] Figure 3 A schematic diagram of a flow chart of a method for avoiding sand and supplying water to a pumped storage power station unit in an embodiment of the present application;

[0025] Figure 4 This is a structural schematic diagram of a sand-avoiding water supply device for a pumped-storage power station unit in an embodiment of the present application;

[0026] Figure 5 This is a schematic diagram of the structure of an electronic device in an embodiment of the present application.

[0027] Figure numerals: 1. first control valve; 2. second control valve; 3. first pressure gauge; 4. filter; 5. pressure reducing valve; 6. second pressure gauge; 7. third control valve; 8. fourth control valve; 9. fifth control valve. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0029] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood by people with ordinary skills in the field to which the present application belongs. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0030] Pumped storage is the use of electricity during the low load period to pump water to the upper reservoir, and then release the water stored in the upper reservoir to the lower reservoir for power generation during the peak load period, also known as energy storage power generation. It can convert the excess electricity during the low load period of the power grid into high-value electricity during the high load period of the power grid, suitable for frequency and phase modulation, can be used to stabilize the frequency and voltage of the power system, and is suitable for emergency standby, and can also improve the efficiency of thermal power plants and nuclear power plants in the power system.

[0031] Pumped-storage power stations are mostly located in mountainous areas. When heavy rains suddenly hit the river basin, a large amount of sediment is washed into the river by the rain. The larger particles of sediment are very destructive to the main and auxiliary machines of the hydro-turbine generator set, forcing the unit to shut down to avoid sand. However, after avoiding sand, the power station still needs to meet some basic water supply guarantees to avoid safety accidents. For example, the main transformer of the power station needs to maintain a suitable temperature at all times to ensure the electricity supply of the entire power station, and the seepage water from the mountain is constantly accumulating and needs to be discharged in time.

[0032] The existing technology uses the water source of the reservoir under the power station for the cooling water of the main transformer and the lubricating water of the leakage drainage pump. As mentioned above, a large amount of sediment will cause the main transformer to be blocked or damage the leakage drainage pump, making it impossible to maintain the basic operation of the power station. It can be considered to excavate a special reservoir in the underground plant or other suitable locations on the mountain to store enough clean water before the flood season to ensure basic water supply, but this method has high excavation and maintenance costs, and the underground plant space or mountain terrain has hard restrictions, which is not easy to meet the excavation conditions. Therefore, there is an urgent need for a low-cost and efficient solution to maintain basic water supply when the unit avoids sand.

[0033] Below, through specific embodiments and combined Figures 1 to 5 To describe the technical solution of this application in detail.

[0034] Some embodiments of the present application provide a water supply system for a water storage power station unit, such as Figure 1As shown, it includes: a main shaft seal water supply pipeline, one end of which is connected to the upper reservoir of the pumped storage power station, and the other end is connected to the unit, for supplying water to the main shaft of the unit; a low-pressure water supply pipeline, connected to the lower reservoir of the pumped storage power station, and a first control valve 1 is provided at a position of the low-pressure water supply pipeline close to the lower reservoir, and the first control valve 1 is used to control the opening and closing of the water supply from the lower reservoir to the low-pressure water supply pipeline; a main transformer water supply pipeline, connected to the low-pressure water supply pipeline, located on the side of the first control valve 1 away from the lower reservoir, and used to supply water to the pumped storage power station. The main transformer of the energy power station is supplied with water; the leakage drainage pump water supply pipeline is connected with the low-pressure water supply pipeline, is located on the side of the first control valve 1 away from the lower reservoir, and is used to supply water to the leakage drainage pump of the pumped storage power station; the sand-avoiding water supply pipeline is connected with the main shaft sealing water supply pipeline at one end and is connected with the low-pressure water supply pipeline at the other end, and is located on the side of the first control valve 1 away from the lower reservoir. The second control valve 2 is provided on the sand-avoiding water supply pipeline, and the second control valve 2 is used to control the opening and closing of the main shaft sealing water supply pipeline to supply water to the low-pressure water supply pipeline.

[0035] like Figure 1 As shown, the water supply system of the hydropower station unit is mainly a pipeline that supplies water to the main engine and auxiliary systems, including the main shaft seal water supply pipeline, the main transformer water supply pipeline, the leakage drainage pump water supply pipeline and the low-pressure water supply pipeline.

[0036] The main shaft seal water supply pipeline is a pipeline that supplies water to the main shaft of the unit. Usually, the water source of the upper reservoir or the lower reservoir is used to lubricate the main shaft to prevent the water guide top cover of the unit from being lifted up and causing water to flow back. In this embodiment, the main shaft seal water supply pipeline is connected to the upper reservoir.

[0037] The main transformer water supply pipeline is a pipeline that supplies water to the main transformer in the auxiliary system to ensure stable operation of the main transformer and maintain the power conditions of the power station. Usually, the water source of the lower reservoir is used to provide cooling water for the main transformer. In this embodiment, the water source of the upper reservoir is used to work during sand avoidance.

[0038] The water supply pipeline of the leakage drainage pump is a pipeline that supplies water to the leakage drainage pump in the auxiliary system, ensuring the stable operation of the leakage drainage pump and timely discharge of the leakage water from the mountain. Usually, the water source of the lower reservoir is used to lubricate the leakage drainage pump. In this embodiment, the water source of the upper reservoir is used to work through improvement when avoiding sand.

[0039] The low-pressure water supply pipeline has an internal pressure lower than 1 MPa and is connected to the lower reservoir. It is used to supply water to the main transformer water supply pipeline and the leakage drainage pump water supply pipeline before sand avoidance. A first control valve 1 is provided on the low-pressure water supply pipeline. In this embodiment, the first control valve 1 needs to be closed during sand avoidance to prevent the lower reservoir from supplying water to the aforementioned pipelines, blocking the main transformer or damaging the leakage drainage pump.

[0040] One end of the sand-avoiding water supply pipeline is connected to the main shaft sealing water supply pipeline, that is, it is connected to the upper reservoir. Compared with the single connection to the upper reservoir, the cost is reduced and the space utilization rate of the power station is improved; the other end is connected to the low-pressure water supply pipeline, that is, it is connected to the leakage drainage pump water supply pipeline and the main transformer water supply pipeline. Compared with the single connection to the leakage drainage pump water supply pipeline and the main transformer water supply pipeline, the cost is reduced and the space utilization rate of the power station is improved; a second control valve 2 is arranged on the sand-avoiding water supply pipeline, so that when the unit is avoiding sand, the second control valve 2 can be opened to guide the water source of the upper reservoir to the main transformer water supply pipeline and the leakage drainage pump water supply pipeline. During rainfall, due to the height difference between the upper and lower reservoirs, the upper reservoir is a clean water source relative to the lower reservoir, and the storage capacity is large enough. After testing, it can maintain the water use for at least one month when the power station is in sand-avoiding operation.

[0041] The control valve is, for example, a solenoid valve, which is not specifically limited. By adding a sand-avoiding water supply pipeline, the upper reservoir connected to the main shaft seal water supply pipeline can be used to supply water to the main transformer water supply pipeline and the leakage drainage pump water supply pipeline when the unit is shut down for sand avoidance. The sand content of the water in the upper reservoir is low, which can ensure the long-term stable operation of the main transformer and the leakage drainage pump, and ensure the safety of the power station during sand-avoiding operation. Compared with the design of a single clean water source reservoir, the cost can be greatly reduced.

[0042] The water supply system of the pumped storage power station units is simple and convenient, with low operation and maintenance costs, and can ensure the safety of the power station during sand-avoiding operation.

[0043] In some embodiments, Figure 1 and Figure 2 As shown, the sand-avoiding water supply pipeline is provided with the second control valve 2, the first pressure gauge 3, the filter 4, the pressure reducing valve 5, the second pressure gauge 6 and the third control valve 7 in sequence. The second control valve 2 is arranged close to the main transformer water supply pipeline, and the third control valve 7 is used to control the opening and closing of the main shaft seal water supply pipeline to supply water to the low-pressure water supply pipeline.

[0044] A second control valve 2 and a third control valve 7 are set and closed before sand avoidance to ensure that the low-pressure water supply pipeline can lead the water source of the lower reservoir to the main shaft seal water supply pipeline and the leakage drainage pump water supply pipeline, and the water source of the upper reservoir can be led to the main shaft seal water supply pipeline; a filter 4 is set to isolate a small amount of sediment or even small fish fry that may be brought by the upper reservoir, and a pressure reducing valve 5 is set to reduce the water flow pressure. The water flow pressure can be adjusted according to the water pressure difference between the upper reservoir and the lower reservoir. For example, it is set to 0.65MPa, and the specific details are not limited. The structure of the pressure reducing valve 5 and the filter 4 can be as follows Figure 2 As shown; setting a first pressure gauge 3 and a second pressure gauge 6 can measure the pressure before and after adjustment.

[0045] In some embodiments, Figure 1As shown, a fourth control valve 8 and a fifth control valve 9 are provided on the main shaft seal water supply pipeline. The fourth control valve 8 is arranged close to the upper reservoir. The fourth control valve 8 and the fifth control valve 9 are used to control the opening and closing of the water supply from the upper reservoir to the main shaft seal water supply pipeline. The sand-avoiding water supply pipeline is connected between the fourth control valve 8 and the fifth control valve 9.

[0046] like Figure 1 As shown, the sand-avoiding water supply pipeline is connected between the fourth control valve 8 and the fifth control valve 9. When the power station is in sand-avoiding operation, the fifth control valve 9 can be closed to avoid supplying water to the main shaft, and then the fourth control valve 8 can be opened to ensure that the upper reservoir can supply water to the low-pressure water supply pipeline.

[0047] In some embodiments, Figure 1 As shown, the water supply system of the pumped-storage power station unit also includes: an air compressor water supply pipeline, connected to the low-pressure water supply pipeline, located on the side of the first control valve 1 away from the lower reservoir, and used to supply water to the air compressor of the pumped-storage power station; a static frequency converter water supply pipeline, connected to the low-pressure water supply pipeline, located on the side of the first control valve 1 away from the lower reservoir, and used to supply water to the static frequency converter of the pumped-storage power station.

[0048] Static Frequency Converter (SFC) is a power electronic power supply device that can provide simultaneous changes in frequency and voltage. It is suitable for pump operation start-up of pumped storage power stations. In the later stage of sand avoidance, for example, when the real-time inflow sand content is reduced to below the fixed sand content, the sand avoidance water supply pipeline can be used to lead the water source of the upper reservoir to the static frequency converter for operation. After running for a fixed time, such as 4 hours, the sand avoidance water supply pipeline is closed, and the water source of the lower reservoir connected by the low-pressure water supply pipeline is used for operation, so as to restart the unit; because the sand content of the lower reservoir is high at the initial stage of restarting the unit, it will cause damage to the static frequency converter. After running for a period of time, the tailwater pipe of the lower reservoir can be flushed to reduce the sand content there, thereby ensuring that the unit can be restarted smoothly.

[0049] The air compressor compresses the water pumped by the water pump into the water storage tank through the pipe, raising the water level so that the water flow can be released to generate electricity when needed. Similarly, it is also a necessary operating system to restart the unit. As mentioned earlier, in the later stage of sand avoidance, the sand avoidance water supply pipeline can be used to lead the water source of the upper reservoir to the air compressor for operation. After running for a fixed time, for example 1 hour, the sand avoidance water supply pipeline is closed and the water source of the lower reservoir connected by the low-pressure water supply pipeline is used to operate in order to restart the unit.

[0050] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0051] In addition, when details are set forth to describe exemplary embodiments of the present application, it is obvious to those skilled in the art that the present application embodiments can be implemented without these details or with changes in these details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0052] Some embodiments of the present application provide a method for supplying water to a pumped storage power station unit to avoid sand, using a pumped storage power station unit water supply system as described in any of the above embodiments, such as Figure 3 As shown, the method for supplying water to pumped storage power station units to avoid sand includes the following steps:

[0053] S1. Obtaining the real-time sediment content of the lower reservoir.

[0054] The real-time sediment content can be obtained by sampling and testing the reservoir at intervals, with no specific restrictions.

[0055] S2. When the real-time inflow sediment content is greater than or equal to the preset sediment content, the second control valve is opened and the first control valve is closed to allow the upper reservoir to supply water to the main transformer water supply pipeline and the leakage drainage pump water supply pipeline.

[0056] The preset sand content is, for example, 3kg / m 3 There is no specific limitation. When the real-time sand content entering the reservoir is large, open the second control valve, use the upper reservoir to supply water to the main transformer water supply pipeline and the leakage drainage pump water supply pipeline, and close the first control valve to prevent the lower reservoir from supplying water to the main transformer water supply pipeline and the leakage drainage pump water supply pipeline, so as to ensure the stable sand-avoiding operation of the power station.

[0057] In some embodiments, the method for avoiding sand and supplying water to a pumped storage power station unit further comprises:

[0058] S3. When the real-time inflow sand content is less than the fixed sand content, the upper reservoir is used to supply water to the air compressor water supply pipeline and the static frequency converter water supply pipeline through the sand-avoiding water supply pipeline. After a fixed time, the first control valve is opened and the second control valve is closed, so that the lower reservoir supplies water to the main transformer water supply pipeline, the leakage drainage pump water supply pipeline, the air compressor water supply pipeline and the static frequency converter water supply pipeline.

[0059] The fixed sand content is less than the preset sand content, for example, the fixed sand content is 1kg / m 3 , there is no specific limitation, as mentioned above, it can ensure that the unit can be restarted smoothly.

[0060] In some embodiments, the method for supplying water to pumped storage power station units to avoid sand further includes:

[0061] S1', after precipitation occurs at the location of the pumped storage power station, obtaining the inflow flow of the lower reservoir.

[0062] The water flow into the reservoir can be monitored by a flow meter, which is more convenient and has better real-time performance than obtaining the real-time sediment content of the reservoir.

[0063] S2': when the inflow water flow is greater than or equal to the preset flow, the second control valve is opened and the first control valve is closed.

[0064] The preset flow rate is, for example, 400m 3 / s, there is no specific limit. When the water flow into the reservoir is large after rainfall, it means that the sand content is high. At this time, the second control valve is opened, the first control valve is closed, and the reservoir is used to supply water to the main transformer water supply pipeline and the leakage drainage pump water supply pipeline to ensure stable sand-avoiding operation of the power station.

[0065] In some embodiments, the method for avoiding sand and supplying water to a pumped storage power station unit further comprises:

[0066] S3', when the inflow water flow is less than the fixed water flow, the upper reservoir is used to supply water to the air compressor water supply pipeline and the static frequency converter water supply pipeline through the sand-avoiding water supply pipeline, and the first control valve is opened after a fixed time, and the second control valve is closed, so that the lower reservoir supplies water to the main transformer water supply pipeline, the leakage drainage pump water supply pipeline, the air compressor water supply pipeline and the static frequency converter water supply pipeline.

[0067] The fixed water flow is less than the preset water flow, for example, the fixed water flow is 200m 3 / s, there is no specific limitation. As mentioned above, it can ensure that the unit can be restarted smoothly.

[0068] In some embodiments, the step of opening the second control valve further comprises:

[0069] S201. Reduce the water pressure in the pipeline to below a preset pressure through the pressure reducing valve of the sand-avoiding water supply pipeline.

[0070] The preset pressure is, for example, 0.65 MPa, with no specific limitation, to ensure safe and stable water supply.

[0071] In some embodiments, the obtaining of the inflow water flow of the lower reservoir includes:

[0072] S101. Obtaining real-time precipitation at the location of the pumped-storage power station.

[0073] Real-time precipitation can be obtained through the Internet-connected cloud meteorological platform, with no specific restrictions.

[0074] S102: When the real-time precipitation is greater than or equal to the preset precipitation, the inflow water flow of the lower reservoir is obtained.

[0075] The preset precipitation is, for example, 30 mm / h, and there is no specific limit. When the precipitation is large, the inflow water flow is obtained to ensure the accuracy of the sand avoidance judgment and avoid the situation where the accidental high sand content is caused by factors such as non-rainfall.

[0076] In some embodiments, the obtaining of the inflow water flow of the lower reservoir includes:

[0077] S101. Obtain the precipitation time at the location of the pumped-storage power station.

[0078] The precipitation time can be obtained through the Internet-connected cloud meteorological platform, with no specific restrictions.

[0079] S102: When the precipitation time is greater than or equal to a preset time, the inflow water flow of the lower reservoir is obtained.

[0080] The preset time is, for example, 2 days, and there is no specific limit. The inflow water flow is obtained when the precipitation is longer to ensure the accuracy of the sand avoidance judgment. Similarly, the accidental high sand content caused by non-rainfall factors is avoided.

[0081] In some embodiments, the obtaining of the inflow water flow of the lower reservoir includes:

[0082] S101, obtaining the water level of the lower reservoir.

[0083] The water level height can be measured by a water level gauge, and there is no specific limitation.

[0084] S102. When the water level is greater than or equal to a preset height, the inflow flow of the lower reservoir is obtained.

[0085] The preset height is, for example, 120m, and there is no specific limit. The inflow water flow is obtained when the water level is high to ensure the accuracy of the sand avoidance judgment. Similarly, the accidental high sand content caused by factors such as non-rainfall is avoided.

[0086] It should be noted that the method of the embodiment of the present application can be performed by a single device, such as a computer or server. The method of this embodiment can also be applied to a distributed scenario and completed by multiple devices cooperating with each other. In the case of such a distributed scenario, one of the multiple devices can only perform one or more steps in the method of the embodiment of the present application, and the multiple devices will interact with each other to complete the described method.

[0087] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0088] As an optional but non-limiting implementation, in response to receiving the user's active request, the prompt information may be sent to the user in the form of a pop-up window, in which the prompt information may be presented in text form. In addition, the pop-up window may also carry a selection control for the user to choose "agree" or "disagree" to provide personal information to the electronic device.

[0089] It is understandable that the above notification and the process of obtaining user authorization are merely illustrative and do not constitute a limitation on the implementation of the present disclosure. Other methods that meet relevant laws and regulations may also be applied to the implementation of the present disclosure.

[0090] In some embodiments of the present application, a pumped storage power station unit sand avoidance water supply device is provided, using the pumped storage power station unit water supply system as described in any of the above embodiments, such as Figure 4 As shown, the sand-avoiding water supply device for the pumped-storage power station unit includes: an acquisition module 41, configured to obtain the real-time inflow sand content of the lower reservoir; a control module 42, configured to open the second control valve and close the first control valve when the real-time inflow sand content is greater than or equal to the preset sand content, so that the upper reservoir supplies water to the main transformer water supply pipeline and the leakage drainage pump water supply pipeline.

[0091] The device of the above embodiment is used to implement the corresponding sand-avoiding water supply method for pumped-storage power station units in any of the above embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0092] Based on the same inventive concept, corresponding to any of the above-mentioned embodiments and methods, the present application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method for avoiding sand and supplying water to a pumped-storage power station unit as described in any of the above embodiments is implemented.

[0093] Figure 5 A more specific schematic diagram of the hardware structure of an electronic device provided in this embodiment is shown, and the device may include: a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040 and a bus 1050. It is characterized in that the processor 1010, the memory 1020, the input / output interface 1030 and the communication interface 1040 realize communication connection with each other inside the device through the bus 1050.

[0094] The processor 1010 can be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this specification.

[0095] The memory 1020 may be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage device, dynamic storage device, etc. The memory 1020 may store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented by software or firmware, the relevant program codes are stored in the memory 1020 and are called and executed by the processor 1010.

[0096] The input / output interface 1030 is used to connect the input / output module to realize information input and output. The input / output module can be configured as a component in the device (not shown in the figure), or it can be externally connected to the device to provide corresponding functions. It is characterized in that the input device can include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output device can include a display, a speaker, a vibrator, an indicator light, etc.

[0097] The communication interface 1040 is used to connect a communication module (not shown) to realize communication interaction between the device and other devices. The communication module can realize communication through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.).

[0098] The bus 1050 includes a path that transmits information between the various components of the device (eg, the processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040).

[0099] It should be noted that, although the above device only shows the processor 1010, the memory 1020, the input / output interface 1030, the communication interface 1040 and the bus 1050, in the specific implementation process, the device may also include other components necessary for normal operation. In addition, it can be understood by those skilled in the art that the above device may also only include the components necessary for implementing the embodiments of the present specification, and does not necessarily include all the components shown in the figure.

[0100] The electronic device of the above embodiment is used to implement the corresponding sand-avoiding water supply method for pumped-storage power station units in any of the above embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0101] Based on the same inventive concept, corresponding to any of the above-mentioned embodiment methods, the present application also provides a non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the sand-avoiding water supply method for a pumped-storage power station unit as described in any of the above embodiments.

[0102] The non-transitory computer-readable medium of this embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of storage media for computers include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, read-only compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device.

[0103] The computer instructions stored in the storage medium of the above embodiment are used to enable the computer to execute the sand-avoiding water supply method for a pumped-storage power station unit as described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0104] Based on the same concept, corresponding to any of the above-mentioned embodiment methods, the present application also provides a computer program product, including computer program instructions. When the computer program instructions are run on a computer, the computer executes the sand-avoiding water supply method for a pumped-storage power station unit as described in any of the above embodiments, which has the beneficial effects of the corresponding method embodiments and will not be repeated here.

[0105] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0106] In addition, to simplify the description and discussion, and in order not to make the embodiments of the present application difficult to understand, the device can be shown in the form of a block diagram, so as to avoid making the embodiments of the present application difficult to understand, and this also takes into account the following fact, that is, the details of the implementation method of these block diagram devices are highly dependent on the platform to be implemented in the embodiments of the present application (that is, these details should be completely within the scope of understanding of those skilled in the art). In the case of elaborating specific details to describe the exemplary embodiments of the present application, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details or when these specific details are changed. Therefore, these descriptions should be considered to be illustrative rather than restrictive.

[0107] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0108] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A water supply system for a pumped storage power station unit, characterized in that: include: A main shaft seal water supply pipeline, one end of which is connected to the upper reservoir of the pumped storage power station and the other end of which is connected to the unit, for supplying water to the main shaft of the unit; A low-pressure water supply pipeline is connected to the lower reservoir of the pumped-storage power station. A first control valve is provided at a position of the low-pressure water supply pipeline close to the lower reservoir. The first control valve is used to control the opening and closing of water supply from the lower reservoir to the low-pressure water supply pipeline. a main transformer water supply pipeline, connected to the low-pressure water supply pipeline, located on a side of the first control valve away from the lower reservoir, and used to supply water to the main transformer of the pumped-storage power station; a leakage drainage pump water supply pipeline, connected to the low-pressure water supply pipeline, located on a side of the first control valve away from the lower reservoir, and used to supply water to the leakage drainage pump of the pumped storage power station; A sand-avoiding water supply pipeline is connected to the main shaft sealing water supply pipeline at one end and to the low-pressure water supply pipeline at the other end, and is located on the side of the first control valve away from the lower reservoir. A second control valve is provided on the sand-avoiding water supply pipeline, and the second control valve is used to control the opening and closing of the main shaft sealing water supply pipeline to supply water to the low-pressure water supply pipeline.

2. The water supply system for a pumped storage power station unit according to claim 1, characterized in that: The second control valve, the first pressure gauge, the filter, the pressure reducing valve, the second pressure gauge and the third control valve are sequentially arranged on the sand-avoiding water supply pipeline. The second control valve is arranged close to the main transformer water supply pipeline. The third control valve is used to control the opening and closing of the main shaft seal water supply pipeline to supply water to the low-pressure water supply pipeline.

3. The water supply system for a pumped storage power station unit according to claim 1, characterized in that: A fourth control valve and a fifth control valve are provided on the main shaft seal water supply pipeline. The fourth control valve is arranged close to the upper reservoir. The fourth control valve and the fifth control valve are used to control the opening and closing of the water supply from the upper reservoir to the main shaft seal water supply pipeline. The sand-avoiding water supply pipeline is connected between the fourth control valve and the fifth control valve.

4. The water supply system for a pumped storage power station unit according to claim 1, characterized in that: Also includes: An air compressor water supply pipeline, connected to the low-pressure water supply pipeline, located on a side of the first control valve away from the lower reservoir, and used to supply water to the air compressor of the pumped-storage power station; The static frequency converter water supply pipeline is connected to the low-pressure water supply pipeline, is located on the side of the first control valve away from the lower reservoir, and is used to supply water to the static frequency converter of the pumped storage power station.

5. A method for supplying water to pumped storage power station units to avoid sand, characterized in that: Using the pumped storage power station unit water supply system according to any one of claims 1 to 4, the pumped storage power station unit sand avoidance water supply method comprises: Obtaining the real-time sediment content of the lower reservoir; When the real-time inflow sand content is greater than or equal to the preset sand content, the second control valve is opened and the first control valve is closed, so that the upper reservoir supplies water to the main transformer water supply pipeline and the leakage drainage pump water supply pipeline.

6. The method for avoiding sand and supplying water to a pumped storage power station unit according to claim 5, characterized in that: Also includes: After precipitation occurs at the location of the pumped-storage power station, obtaining the inflow flow of the lower reservoir; When the inflow water flow is greater than or equal to the preset flow, the second control valve is opened and the first control valve is closed.

7. The method for avoiding sand and supplying water to a pumped storage power station unit according to claim 5, characterized in that: The step of opening the second control valve then includes: reducing the water pressure in the pipeline to below a preset pressure through a pressure reducing valve of the sand-avoiding water supply pipeline.

8. The method for supplying water to pumped storage power station units to avoid sand according to claim 6, characterized in that: The obtaining of the inflow water flow of the lower reservoir comprises: Obtaining real-time precipitation at the location of the pumped-storage power station; When the real-time precipitation is greater than or equal to the preset precipitation, the inflow water flow of the lower reservoir is obtained.

9. The method for supplying water to pumped storage power station units to avoid sand according to claim 6, characterized in that: The obtaining of the inflow water flow of the lower reservoir comprises: Obtaining the precipitation time at the location of the pumped-storage power station; When the precipitation time is greater than or equal to the preset time, the inflow water flow of the lower reservoir is obtained.

10. The method for avoiding sand and supplying water to a pumped storage power station unit according to claim 6, characterized in that: The obtaining of the inflow water flow of the lower reservoir comprises: Obtaining the water level of the lower reservoir; When the water level is greater than or equal to a preset height, the inflow flow of the lower reservoir is obtained.

Images