Method and device for controlling impulse turbine, and impulse turbine

Abstract

The invention discloses a control method and a control device of an impulse turbine and the impulse turbine, and relates to the field of water turbines.The impulse turbine comprises a plurality of nozzles and a rotating wheel, the nozzles are arranged around the rotating wheel, the nozzles form a plurality of nozzle sets, each nozzle set comprises at least two nozzles, and the nozzles are arranged around the rotating wheel. The control method comprises the steps that the opening and closing time of a needle valve of the nozzle is adjusted to be first preset time, the opening and closing time is the time consumed by the needle valve from closing to complete opening or from complete opening to closing, and the first preset time is any value between 30 s and 45 s; judging whether the impulse turbine is in a load shedding working condition; and if it is judged that the impulse turbine is in the load shedding working condition, the multiple nozzle sets are closed in sequence. Therefore, when the impulse water turbine is in the load shedding working condition, the multiple nozzle sets are sequentially closed, the water hammer pressure of the pressure water conveying pipeline system of the impulse water power station can be effectively improved, and the safety of the pressure water conveying pipeline system of the impulse water power station is improved.

Description

Technical Field

[0001] This invention relates to the field of water turbines, and in particular to a control method, control device, and impulse water turbine. Background Technology

[0002] Impulse turbines have advantages such as low investment cost, simple structure, applicability to high heads, and installation elevation not limited by cavitation conditions, and are therefore widely used in high-head hydropower stations both domestically and internationally. However, when an impulse turbine experiences extreme load shedding conditions, the water hammer pressure in the pressurized water conveyance pipeline system of the impulse hydropower station is high, affecting the safety of the pressurized water conveyance pipeline system. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to propose a control method for impulse turbines that effectively improves the water hammer pressure in the pressurized water conveyance pipeline system of impulse hydropower stations, thereby enhancing the safety of the pressurized water conveyance pipeline system of impulse hydropower stations.

[0004] The present invention further proposes a control device for an impulse turbine.

[0005] The present invention further proposes a computer-readable storage medium.

[0006] The present invention further proposes an impulse turbine.

[0007] According to the control method of the impulse turbine of the present invention, the impulse turbine includes: a plurality of nozzles and a runner, the plurality of nozzles being arranged around the runner, the plurality of nozzles being configured as a plurality of nozzle groups, each nozzle group including at least two nozzles, the control method including: adjusting the opening and closing time of the needle valve of the nozzle to a first preset time, the opening and closing time being the time consumed by the needle valve from closed to fully open or from fully open to closed, the first preset time being any value between 30s and 45s; determining whether the impulse turbine is in a load shedding condition; if it is determined that the impulse turbine is in the load shedding condition, then sequentially closing the plurality of nozzle groups.

[0008] According to the control method of the impulse turbine of the present invention, when the impulse turbine is in the load shedding condition, by sequentially closing multiple sets of nozzle groups, the water hammer pressure of the pressurized water transmission pipeline system of the impulse hydropower station can be effectively improved, thereby enhancing the safety of the pressurized water transmission pipeline system of the impulse hydropower station.

[0009] In some examples of the invention, the two nozzles in each group of nozzles are arranged symmetrically.

[0010] In some examples of the present invention, the plurality of nozzle groups include: a first nozzle group, a second nozzle group, ..., an Nth nozzle group, wherein the first nozzle group includes two first nozzles, the second nozzle group includes two second nozzles, and the Nth nozzle group includes two Nth nozzles. Along the circumferential direction of the plurality of nozzles, the first nozzle, the second nozzle, ..., the Nth nozzle, the first nozzle, the second nozzle, ..., the Nth nozzle are arranged in sequence. If it is determined that the impulse turbine is in the load shedding condition, then closing the plurality of nozzle groups in sequence includes closing the plurality of nozzle groups in the order of the first nozzle group, the second nozzle group, ..., the Nth nozzle group.

[0011] In some examples of the present invention, the control method further includes: determining whether the impulse turbine participates in the power grid regulation; if it is determined that the impulse turbine participates in the power grid regulation, adjusting the opening of the needle valve according to the power deviation.

[0012] In some examples of the present invention, if it is determined that the impulse turbine participates in the power grid regulation, then adjusting the opening of the needle valve according to the power deviation includes: adjusting the opening of the needle valve according to the following formula:

[0013] in, , , , , These represent the unit's given power, actual power, and rated power, respectively, in MW. , These are the initial time values ​​of the unit's given power and the actual power, respectively, in MW. For needle valve opening, This is the buffer time constant, in seconds. The permanent slip coefficient, The time constant of the main relay is expressed in seconds. This is the transient slip coefficient.

[0014] According to the control device for an impulse turbine of the present invention, the impulse turbine includes: a plurality of nozzles and a runner, the plurality of nozzles being arranged around the runner, the plurality of nozzles being configured as multiple nozzle groups, each nozzle group including at least two nozzles, the control device including: a drive module for driving the opening and closing of needle valves of the nozzles; a judgment module for judging whether the impulse turbine is in a load shedding condition; and a control module for controlling the drive module to sequentially close multiple nozzle groups when the impulse turbine is in the load shedding condition.

[0015] In some examples of the present invention, the judgment module is further configured to determine whether the impulse turbine participates in the power grid regulation; the control module is further configured to control the drive module to adjust the opening of the needle valve according to the power deviation when the impulse turbine participates in the power grid regulation.

[0016] In some examples of the present invention, the control module controls the drive module to adjust the opening degree of the needle valve according to the following formula:

[0017] in, , , , , These represent the unit's given power, actual power, and rated power, respectively, in MW. , These are the initial time values ​​of the unit's given power and the actual power, respectively, in MW. For needle valve opening, This is the buffer time constant, in seconds. The permanent slip coefficient, The time constant of the main relay is expressed in seconds. This is the transient slip coefficient.

[0018] According to the present invention, a computer-readable storage medium thereon stores a control program for an impulse turbine, which, when executed by a processor, implements the above-described control method for an impulse turbine.

[0019] According to the computer-readable storage medium of the present invention, when the impulse turbine is in a load shedding condition, by sequentially closing multiple sets of nozzle groups, the water hammer pressure of the pressurized water conveyance pipeline system of the impulse hydropower station can be effectively improved, thereby enhancing the safety of the pressurized water conveyance pipeline system of the impulse hydropower station.

[0020] The impulse turbine according to the present invention includes a memory, a processor, and a control program for the impulse turbine stored in the memory and executable on the processor. When the processor executes the control program for the impulse turbine, it implements the above-described control method for the impulse turbine.

[0021] According to the impulse turbine of the present invention, when the impulse turbine is in a load shedding condition, by sequentially closing multiple sets of nozzle groups, the water hammer pressure of the pressurized water transmission pipeline system of the impulse hydropower station can be effectively improved, thereby enhancing the safety of the pressurized water transmission pipeline system of the impulse hydropower station.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a flowchart of the control method for an impulse turbine according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a water supply pipeline system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the control device for an impulse turbine according to an embodiment of the present invention; Figure 4 This is a block diagram illustrating the processor, memory, communication interface, and communication bus according to an embodiment of the present invention. Figure 5 This is a diagram showing the power variation of an impulse turbine under two shutdown strategies for increased load, as described in an embodiment of the present invention. Figure 6 This is a diagram showing the power variation of an impulse turbine under two shutdown strategies for load reduction according to an embodiment of the present invention.

[0024] Figure label: Control device 10; Judgment module 11; Control module 12; Drive module 13; 20. Water transmission pipeline system; 21. Upstream reservoir; 22. Surge chamber; 23. Pipeline; 24 impulse turbine; runner 241; needle valve 242; deflector 2421; first nozzle group 243; first nozzle 2431; second nozzle group 244; second nozzle 2441; third nozzle group 245; third nozzle 2451; Processor 1201; Communication interface 1202; Memory 1203; Communication bus 1204. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] The following is for reference. Figures 1-6 The present invention describes a control method for an impulse turbine 24 and a control device 10 for an impulse turbine 24 according to an embodiment of the present invention.

[0027] like Figure 2 As shown, the impulse turbine 24 includes: multiple nozzles and a runner 241. The multiple nozzles are arranged around the runner 241, and the multiple nozzles are configured as multiple nozzle groups, each nozzle group including at least two nozzles. The number of nozzles can be multiple, for example, two, four, six, or more. The multiple nozzles are arranged circumferentially around the runner 241. As some embodiments of this application, when four nozzles are set, the nozzles are grouped in pairs, forming two nozzle groups. As some embodiments of this application, when six nozzles are set, the nozzles are grouped in pairs, forming three nozzle groups.

[0028] This application uses a configuration of six nozzles, forming three sets of nozzle groups, as an example. The first nozzle group 243 includes two first nozzles 2431, the second nozzle group 244 includes two second nozzles 2441, and the third nozzle group 245 includes two third nozzles 2451. The nozzles also include deflectors 2421, which are rotatably configured to correspond to the respective needle valves 242 to change the direction of the output water flow.

[0029] The water transmission pipeline system 20 includes an upstream reservoir 21, a surge chamber 22, and a pipeline 23. Along the extension direction of the pipeline 23, the upstream reservoir 21, the surge chamber 22, and the impulse turbine 24 are arranged in sequence and are all connected to the pipeline 23.

[0030] like Figure 3 As shown, the control device 10 of the impulse turbine 24 according to an embodiment of the present invention includes: a drive module 13, a judgment module 11, and a control module 12.

[0031] The drive module 13 is used to drive the opening and closing of the needle valve 242 of the nozzle. As some embodiments of this application, the drive module 13 can be configured as an electric drive module 13, or the drive module 13 can be configured as a hydraulic drive module 13. The drive module 13 is used to drive the needle valve 242 of the nozzle to open and close. Specifically, the drive module 13 is used to drive the needle valve 242 of the nozzle to actuate to adjust the opening degree of the needle valve 242 so that the opening degree of the needle valve 242 switches between 0% and 100%.

[0032] The determination module 11 is used to determine whether the impulse turbine 24 is in a load shedding condition. As some embodiments of this application, the determination module 11 may include a detection device. When the detection device detects an abnormal increase in the rotational speed of the runner 241 of the impulse turbine 24, it can determine that the impulse turbine 24 is in a load shedding condition.

[0033] The control module 12 is used to control the drive module 13 to sequentially close multiple sets of nozzles when the impulse turbine 24 is in a load shedding condition. The control module 12 is communicatively connected to the judgment module 11 and the drive module 13. In some embodiments of this application, the control module 12 is connected to the judgment module 11 and the drive module 13 via wires; in other embodiments, the control module 12 is wirelessly connected to the judgment module 11 and the drive module 13. When the judgment module 11 detects an abnormal increase in the rotational speed of the impeller 241 of the impulse turbine 24, it can determine that the impulse turbine 24 is in a load shedding condition and transmit this information to the control module 12. The control module 12 can then control the drive module 13 to sequentially close multiple sets of nozzles based on this information.

[0034] Specifically, when the detection equipment of the judgment module 11 does not detect that the impulse turbine 24 is in a load shedding condition, the impulse turbine 24 operates normally. When the detection equipment of the judgment module 11 detects an abnormal increase in the rotational speed of the impeller 241 of the impulse turbine 24, and determines that the impulse turbine 24 is in a load shedding condition, the judgment module 11 transmits the information that the impulse turbine 24 is in a load shedding condition to the control module 12. The control module 12 can control the drive module 13 to drive the needle valves 242 of multiple nozzles to switch their openings to 0% sequentially to close multiple sets of nozzles, effectively improving the water hammer pressure of the pressurized water transmission pipeline 23 system 20 of the impulse hydropower station and enhancing the safety of the pressurized water transmission pipeline 23 system 20 of the impulse hydropower station.

[0035] Therefore, when the impulse turbine 24 is in a load shedding condition, by sequentially closing multiple sets of nozzles, the water hammer pressure of the pressurized water transmission pipeline 23 system 20 of the impulse hydropower station can be effectively reduced, thereby improving the safety of the pressurized water transmission pipeline 23 system 20 of the impulse hydropower station.

[0036] As some embodiments of the present invention, such as Figure 2 As shown, the two nozzles in each nozzle group are arranged symmetrically.

[0037] Each nozzle group includes two nozzles, which are arranged symmetrically. Specifically, the two nozzles in each nozzle group can be arranged symmetrically with the diameter of the rotor 241 as the axis of symmetry. This arrangement makes the nozzle arrangement reasonable, and the symmetrically arranged nozzles can make the high-speed jet uniformly cover the circumference of the rotor 241, so that the rotor 241 is subjected to uniform force, reducing the risk of kinetic energy waste. It can also reduce the risk of the jet possibly crossing or overlapping inside the rotor 241, thereby reducing the risk of water flow collision and turbulence, and improving kinetic energy efficiency.

[0038] As some embodiments of the present invention, such as Figure 2As shown, the multiple nozzle groups include: a first nozzle group 243, a second nozzle group 244, ..., an Nth nozzle group. The first nozzle group 243 includes two first nozzles 2431, the second nozzle group 244 includes two second nozzles 2441, and the Nth nozzle group includes two Nth nozzles. Along the circumferential direction of the multiple nozzles, the first nozzles 2431, the second nozzles 2441, ..., the Nth nozzles are arranged in sequence. If it is determined that the impulse turbine 24 is in a load shedding condition, the multiple nozzle groups are closed sequentially, including closing the multiple nozzle groups in the order of the first nozzle group 243, the second nozzle group 244, ..., the Nth nozzle group.

[0039] In this arrangement, along the circumferential direction of the multiple nozzles, that is, the circumference of the rotor 241, the first nozzle 2431, the second nozzle 2441, ..., the Nth nozzle are arranged in sequence. This arrangement ensures that the two nozzles of any group of nozzles are symmetrically arranged, so that the rotor 241 is subjected to uniform force, reducing the risk of kinetic energy waste. It also reduces the risk of jets crossing or overlapping inside the rotor 241, thereby reducing the risk of water flow collision and turbulence, and improving kinetic energy efficiency.

[0040] If the detection equipment of the judgment module 11 detects an abnormal increase in the rotational speed of the runner 241 of the impulse turbine 24, and determines that the impulse turbine 24 is in a load shedding condition, the judgment module 11 transmits the information that the impulse turbine 24 is in a load shedding condition to the control module 12. The control module 12 can control the drive module 13 to drive the needle valve 242 of the nozzles to switch the opening to 0% sequentially according to the order of the first nozzle group 243, the second nozzle group 244, ..., the Nth nozzle group, so as to close multiple nozzle groups in sequence. Closing multiple nozzle groups in sequence can effectively improve the water hammer pressure of the pressurized water transmission pipeline system 20 of the impulse hydropower station and improve the safety of the pressurized water transmission pipeline system 20 of the impulse hydropower station.

[0041] In some embodiments of the present invention, the judgment module 11 is further used to determine whether the impulse turbine 24 participates in grid power regulation; the control module 12 is further used to control the drive module 13 to adjust the opening of the needle valve 242 according to the power deviation when the impulse turbine 24 participates in grid power regulation.

[0042] When the impulse turbine 24 participates in grid power regulation, the judgment module 11 determines that the impulse turbine 24 is participating in grid power regulation based on the grid command, and transmits the information of the impulse turbine 24 participating in grid power regulation to the control module 12. The control module 12 can control the drive module 13 to drive each needle valve 242 of the nozzle to move at the maximum speed set for 30s~45s according to the information of the impulse turbine 24 participating in grid power regulation. The impulse turbine 24 participates in grid power regulation with a PI controller, which is beneficial to improve the speed at which the impulse turbine 24 tracks the power command, reduce the adjustment time of the impulse turbine 24 tracking the power command, and reduce the overshoot, thereby effectively improving the regulation quality of the impulse turbine 24 and providing technical support for the participation of the impulse hydropower station in grid regulation.

[0043] In some embodiments of the present invention, the control module 12 controls the drive module 13 to adjust the opening degree of the needle valve 242 according to the following formula:

[0044] in, , , , , These represent the unit's given power, actual power, and rated power, respectively, in MW. , These are the initial time values ​​of the unit's given power and the actual power, respectively, in MW. For needle valve 242 opening degree, This is the buffer time constant, in seconds. The permanent slip coefficient, The time constant of the main relay is expressed in seconds. This is the transient slip coefficient.

[0045] In some embodiments of this application, the impulse hydroelectric power station is equipped with three impulse turbines 24, and the power station adopts a single-tunnel, three-turbine water conveyance and power generation system. The water diversion tunnel is 17326.6m long, the pressure pipeline 23 is 1086.7m long, and a narrow, elongated upper chamber surge tank 22 with impedance bands is located at the end of the water diversion tunnel. The surge tank 22 has a cross-sectional area of ​​113.097m² and an impedance coefficient of 7.051×10⁻⁶. -3 The impulse turbine 24 has a rated output of 69MW and a rated speed of 500.0 r / min. The water level in the upstream reservoir 21 is 3290m. Detailed information on other unit parameters is shown in Table 1. A simplified layout diagram of the water transmission pipeline system 20 is shown below. Figure 2 As shown.

[0046] Table 1. Detailed parameters of the 24 impulse turbine units.

[0047] Based on the above engineering data, the verification of the load shedding shutdown condition and the power tracking condition participating in grid regulation was carried out in accordance with the method of this application.

[0048] Given two possible power command scenarios, the proposed halting strategy improves power command tracking as follows: Case 1: At time 20s, the power command of the impulse turbine 24 jumps from 63MW to 40MW. Case 2: At time 20s, the power command of the impulse turbine 24 jumps from 40MW to 60MW. In all cases, the parameters of the PI controller and the hydraulic actuator are as follows: =3.0; =1.5; =0.02; =0.04.

[0049] The power point tracking results in the above two cases are as follows: Figures 5-6 As shown, after adopting the proposed shutdown strategy, the pressure at the end of the pressure pipeline 23 of the impulse hydropower station under load shedding conditions does not change significantly, which can also be improved. However, the speed at which the impulse turbine 24 sets tracks the power command is effectively improved, the regulation time is effectively reduced, the overshoot is significantly reduced, and the regulation quality of the impulse turbine 24 is effectively improved.

[0050] Figure 1 This is a flowchart of a control method for an impulse turbine according to an embodiment of the present invention. The control device for the impulse turbine described above can implement the control method for the impulse turbine. The impulse turbine includes: multiple nozzles and a runner. The multiple nozzles are arranged around the runner, and the multiple nozzles are configured as multiple nozzle groups, each nozzle group including at least two nozzles. The number of nozzles can be multiple, for example, two, four, six, or more nozzles. The multiple nozzles are arranged around the runner circumferentially. The multiple nozzles are configured as multiple nozzle groups, each nozzle group including at least two nozzles. As some embodiments of this application, when four nozzles are set, the nozzles are grouped in pairs, forming two nozzle groups. As some embodiments of this application, when six nozzles are set, the nozzles are grouped in pairs, forming three nozzle groups.

[0051] This application uses a configuration of six nozzles, arranged in three groups, as an example. The first nozzle group includes two first nozzles, the second nozzle group includes two second nozzles, and the third nozzle group includes two third nozzles. Each nozzle also includes a deflector, which is rotatable and corresponds to a needle valve to change the direction of the output water flow.

[0052] The water transmission pipeline system includes an upstream reservoir, a surge chamber, and a pipeline. Along the extension direction of the pipeline, the upstream reservoir, surge chamber, and impulse turbine are arranged in sequence and connected to the pipeline.

[0053] like Figure 1 As shown, the control method for this impulse turbine includes the following steps: S1, adjust the opening and closing time of the nozzle needle valve to a first preset time. The opening and closing time is the time consumed by the needle valve from closed to fully open or from fully open to closed. The first preset time is any value between 30s and 45s. The first preset time can be, but is not limited to, 30s, 40s or 45s, as long as the first preset time is any value between 30s and 45s.

[0054] S2, determine whether the impulse turbine is in a load shedding condition. As some embodiments of this application, the determination module is used to determine whether the impulse turbine is in a load shedding condition. As some embodiments of this application, the determination module may include a detection device; when the detection device detects an abnormal increase in the rotational speed of the impulse turbine runner, it can determine that the impulse turbine is in a load shedding condition.

[0055] S3, if it is determined that the impulse turbine is in a load shedding condition, multiple sets of nozzles are closed sequentially. In some embodiments of this application, the drive module is used to drive the opening and closing of the nozzle needle valve. In some embodiments of this application, the drive module can be configured as an electric drive module, or it can be configured as a hydraulic drive module. The drive module is used to drive the opening and closing of the nozzle needle valve; specifically, the drive module is used to drive the nozzle needle valve to adjust the opening degree of the needle valve, so that the opening degree of the needle valve switches between 0% and 100%. The control module is communicatively connected to the judgment module and the drive module. In some embodiments of this application, the control module is connected to the judgment module and the drive module via wires; in some embodiments of this application, the control module is wirelessly connected to the judgment module and the drive module. When the judgment module detects an abnormal increase in the speed of the impulse turbine runner, it can determine that the impulse turbine is in a load shedding condition and transmit this information to the control module. The control module can then control the drive module to sequentially close multiple sets of nozzles based on this information.

[0056] Specifically, when the detection equipment of the judgment module does not detect that the impulse turbine is in a load shedding condition, the impulse turbine operates normally. When the detection equipment of the judgment module detects an abnormal increase in the speed of the impulse turbine runner, indicating that the impulse turbine is in a load shedding condition, the judgment module transmits this information to the control module. The control module can then control the drive module to sequentially switch the needle valve opening of the nozzles to 0% to close multiple sets of nozzles, effectively reducing the water hammer pressure in the pressurized water transmission pipeline system of the impulse hydropower station and improving the safety of the pressurized water transmission pipeline system.

[0057] Therefore, when the impulse turbine is in a load shedding condition, closing multiple sets of nozzles in sequence can effectively reduce the water hammer pressure in the pressurized water transmission pipeline system of the impulse hydropower station and improve the safety of the pressurized water transmission pipeline system of the impulse hydropower station.

[0058] As some embodiments of the present invention, the two nozzles of each nozzle group are arranged symmetrically.

[0059] Each nozzle group consists of two nozzles, which are arranged symmetrically. Specifically, the two nozzles in each nozzle group can be arranged symmetrically with the diameter of the rotor as the axis of symmetry. This arrangement makes the nozzle arrangement reasonable, and the symmetrical arrangement of the nozzles can make the high-speed jet evenly cover the circumference of the rotor, so that the rotor is subjected to uniform force, reducing the risk of kinetic energy waste. It can also reduce the risk of the jet crossing or overlapping inside the rotor, thereby reducing the risk of water flow collision and turbulence, and improving kinetic energy efficiency.

[0060] As some embodiments of the present invention, the multiple nozzle groups include: a first nozzle group, a second nozzle group, ..., an Nth nozzle group, where the first nozzle group includes two first nozzles, the second nozzle group includes two second nozzles, and the Nth nozzle group includes two Nth nozzles. Along the circumferential direction of the multiple nozzles, the first nozzle, the second nozzle, ..., the Nth nozzle, the first nozzle, the second nozzle, ..., the Nth nozzle are arranged sequentially. If it is determined that the impulse turbine is in a load shedding condition, then closing the multiple nozzle groups sequentially includes closing the multiple nozzle groups sequentially in the order of the first nozzle group, the second nozzle group, ..., the Nth nozzle group.

[0061] In this arrangement, the first nozzle, the second nozzle, ..., the Nth nozzle, the first nozzle, the second nozzle, ..., the Nth nozzle are arranged in sequence along the circumferential direction of the rotor. This arrangement ensures that the two nozzles in any group of nozzles are symmetrically arranged, so that the rotor is subjected to uniform force, reducing the risk of kinetic energy waste. It also reduces the risk of jets crossing or overlapping inside the rotor, thereby reducing the risk of water flow collision and turbulence, and improving kinetic energy efficiency.

[0062] If the detection equipment of the judgment module detects an abnormal increase in the rotational speed of the impulse turbine runner, indicating that the impulse turbine is in a load-shedding condition, the judgment module transmits this information to the control module. The control module, based on this information, controls the drive module to sequentially switch the needle valve openings of the nozzles to 0% in the order of the first nozzle group, the second nozzle group, ..., the Nth nozzle group, thereby closing multiple nozzle groups in sequence. Sequentially closing multiple nozzle groups effectively reduces water hammer pressure in the pressurized water transmission pipeline system of the impulse hydropower station, improving the safety of the pressurized water transmission pipeline system.

[0063] In some embodiments of the present invention, the determination module is further used to determine whether the impulse turbine participates in grid power regulation; the control module is further used to control the drive module to adjust the opening of the needle valve according to the power deviation when the impulse turbine participates in grid power regulation.

[0064] When the impulse turbine participates in grid power regulation, the judgment module determines whether the impulse turbine is participating in grid power regulation based on the grid command and transmits this information to the control module. The control module can then control the drive module to drive the needle valves of the nozzles to move at the maximum speed set between 30s and 45s. The impulse turbine's participation in grid power regulation using a PI controller improves the speed at which it tracks power commands, reduces the adjustment time for tracking power commands, and minimizes overshoot, thereby effectively improving the regulation quality of the impulse turbine and providing technical support for the participation of impulse hydropower stations in grid regulation.

[0065] In some embodiments of the present invention, the control module controls the drive module to adjust the opening degree of the needle valve according to the following formula:

[0066] in, , , , , These represent the unit's given power, actual power, and rated power, respectively, in MW. , These are the initial time values ​​of the unit's given power and the actual power, respectively, in MW. For needle valve opening, This is the buffer time constant, in seconds. The permanent slip coefficient, The time constant of the main relay is expressed in seconds. This is the transient slip coefficient.

[0067] In some embodiments of this application, the impulse hydroelectric power station is equipped with three impulse turbines, employing a single-tunnel, three-turbine water conveyance and power generation system. The water diversion tunnel is 17326.6m long, and the pressure pipeline is 1086.7m long. A narrow, elongated upper chamber with impedance bands is located at the end of the water diversion tunnel. The cross-sectional area of ​​the surge tank is 113.097m², and the impedance coefficient is 7.051×10⁻⁶. -3 The impulse turbine has a rated output of 69MW and a rated speed of 500.0 r / min. The water level in the upstream reservoir is 3290m. Detailed information on other unit parameters is shown in Table 1. A simplified diagram of the water transmission pipeline layout is shown below. Figure 2 As shown.

[0068] Table 1. Detailed parameters of impulse turbine units

[0069] Based on the above engineering data, the verification of the load shedding shutdown condition and the power tracking condition participating in grid regulation was carried out in accordance with the method of this application.

[0070] Given two possible power command scenarios, the proposed halting strategy improves power command tracking as follows: Case 1: At time 20s, the power command of the impulse turbine jumps from 63MW to 40MW. Scenario 2: At time 20s, the power command of the impulse turbine jumps from 40MW to 60MW. In all cases, the parameters of the PI controller and the hydraulic actuator are as follows: =3.0; =1.5; =0.02; =0.04.

[0071] The power point tracking results in the above two cases are as follows: Figures 5-6 As shown, after adopting the proposed shutdown strategy, the pressure at the end of the pressure pipeline of the impulse hydropower station under load shedding conditions does not change significantly, which can also be improved. However, the speed at which the impulse turbine unit tracks the power command is effectively improved, the regulation time is effectively reduced, the overshoot is significantly reduced, and the regulation quality of the impulse turbine is effectively improved.

[0072] To implement the above embodiments, the present invention proposes a computer-readable storage medium storing a control program for an impulse turbine, which, when executed by a processor, implements the above-described control method for an impulse turbine.

[0073] According to the computer-readable storage medium of the present invention, when the impulse turbine is in a load shedding condition, by sequentially closing multiple sets of nozzle groups, the water hammer pressure of the pressurized water conveyance pipeline system of the impulse hydropower station can be effectively improved, thereby enhancing the safety of the pressurized water conveyance pipeline system of the impulse hydropower station.

[0074] To achieve the above embodiments, the present invention proposes an impulse turbine, which includes a memory, a processor, and a control program for the impulse turbine stored in the memory and executable on the processor. When the processor executes the control program for the impulse turbine, it implements the above-described control method for the impulse turbine.

[0075] like Figure 4 As shown, the impulse turbine may include at least one processor 1201, at least one communication interface 1202, at least one memory 1203, and at least one communication bus 1204. In an embodiment of the present invention, the number of processor 1201, communication interface 1202, memory 1203, and communication bus 1204 is at least one, and the processor 1201, communication interface 1202, and memory 1203 communicate with each other through the communication bus 1204.

[0076] The memory 1203 may be, but is not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), etc. The memory 1203 stores the program, and after receiving the execution instruction, the processor 1201 executes the program to implement the steps of the impulse turbine control method described in the above embodiments.

[0077] Processor 1201 may be an integrated circuit chip with signal processing capabilities. The aforementioned processor can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this invention. The general-purpose processor can be a microprocessor or any conventional processor.

[0078] The vehicle may include a temperature management module, which is used to manage the temperature of the processor 1201 and the memory 1203 to reduce the risk of information processing, storage and transmission failures caused by excessive temperature of the processor 1201 and the memory 1203.

[0079] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0080] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0081] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0082] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0083] In the description of this invention, "a plurality of" means two or more.

[0084] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0085] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0086] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0087] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A control method for an impulse turbine, characterized in that, The impulse turbine includes: multiple nozzles and a runner, wherein the multiple nozzles are arranged around the runner, and the multiple nozzles are configured as multiple nozzle groups, each nozzle group including at least two nozzles; the control method includes: The opening and closing time of the needle valve of the nozzle is adjusted to a first preset time, wherein the opening and closing time is the time consumed by the needle valve from closed to fully open or from fully open to closed, and the first preset time is any value between 30s and 45s. Determine whether the impulse turbine is in a load shedding condition; If it is determined that the impulse turbine is in the load shedding condition, then multiple sets of nozzles are shut down sequentially.

2. The control method for an impulse turbine according to claim 1, characterized in that, The two nozzles in each nozzle group are arranged symmetrically.

3. The control method for an impulse turbine according to claim 2, characterized in that, The multiple sets of nozzle groups include: a first nozzle group, a second nozzle group, ..., an Nth nozzle group, wherein the first nozzle group includes two first nozzles, the second nozzle group includes two second nozzles, and the Nth nozzle group includes two Nth nozzles. Along the circumferential direction of the multiple nozzles, the first nozzle, the second nozzle, ..., the Nth nozzle, the first nozzle, the second nozzle, ..., the Nth nozzle are arranged sequentially. If it is determined that the impulse turbine is in the load shedding condition, then sequentially closing multiple groups of nozzles includes: sequentially closing multiple groups of nozzles in the order of the first nozzle group, the second nozzle group, ..., the Nth nozzle group.

4. The control method for an impulse turbine according to claim 1, characterized in that, The control method further includes: determining whether the impulse turbine participates in grid power regulation; If it is determined that the impulse turbine participates in the power grid regulation, the opening of the needle valve is adjusted according to the power deviation.

5. The control method for an impulse turbine according to claim 4, characterized in that, If it is determined that the impulse turbine participates in the power grid regulation, then adjusting the opening of the needle valve according to the power deviation includes: The opening degree of the needle valve is then adjusted according to the following formula: in, , , , , These represent the unit's given power, actual power, and rated power, respectively, in MW. , These are the initial time values ​​of the unit's given power and the actual power, respectively, in MW. For needle valve opening, This is the buffer time constant, in seconds. This is the permanent slip coefficient. The time constant of the main relay is expressed in seconds (s). This is the transient slip coefficient.

6. A control device for an impulse turbine, characterized in that, The impulse turbine includes: multiple nozzles and a runner, the multiple nozzles being arranged around the runner, the multiple nozzles being configured as multiple nozzle groups, each nozzle group including at least two nozzles, and the control device including: A drive module, which is used to drive the opening and closing of the needle valve of the nozzle; The judgment module is used to determine whether the impulse turbine is in a load shedding condition; A control module is used to control the drive module to sequentially shut down multiple sets of nozzles when the impulse turbine is in the load shedding condition.

7. The control device for an impulse turbine according to claim 6, characterized in that, The judgment module is also used to determine whether the impulse turbine participates in grid power regulation. The control module is also used to control the drive module to adjust the opening of the needle valve according to the power deviation when the impulse turbine participates in the power grid regulation.

8. The control device for an impulse turbine according to claim 7, characterized in that, The control module controls the drive module to adjust the opening degree of the needle valve according to the following formula: in, , , , , These represent the unit's given power, actual power, and rated power, respectively, in MW. , These are the initial time values ​​of the unit's given power and the actual power, respectively, in MW. For needle valve opening, This is the buffer time constant, in seconds. This is the permanent slip coefficient. The time constant of the main relay is expressed in seconds (s). This is the transient slip coefficient.

9. A computer-readable storage medium, characterized in that, It stores a control program for an impulse turbine, which, when executed by a processor, implements the control method for an impulse turbine according to any one of claims 1-5.

10. An impulse turbine, characterized in that, The system includes a memory, a processor, and a control program for an impulse turbine stored in the memory and executable on the processor. When the processor executes the control program for the impulse turbine, it implements the control method for the impulse turbine according to any one of claims 1-5.

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