Self-adaptive water turbine water hammer time constant calculation method and system

Abstract

The invention discloses an adaptive water turbine water hammer time constant calculation method and system. The method comprises the steps of determining a calculation formula of a water hammer time constant of the water turbine based on the length of a water diversion pipeline of the water turbine, the cross sectional area of the water diversion pipeline, any water head, flow under any guide vane opening degree and gravitational acceleration; based on a guide vane outlet outflow angle, a runner blade outlet angle and a guide vane height, eta r is vane efficiency, hydraulic efficiency, runner blade outlet edge overflowing area, gravitational acceleration, a water turbine working water head, a water guide blade outlet angular velocity and a water guide blade outlet radius, a calculation formula of the water turbine flow in unit time is determined; under the condition that the rotating speed and the guide vane height of the water turbine are not changed, based on the flow of the water turbine in unit time, the supposed impeller efficiency and the supposed constant water turbine flow of hydraulic efficiency are determined; and calculating the adaptive water hammer time constant under the time-varying parameters based on the assumed constant water turbine flow of the impeller efficiency and the hydraulic efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power systems, and more particularly to an adaptive hydraulic turbine water hammer time constant calculation method and system. Background Art

[0002] The theoretical value of the water hammer time constant of the turbine of a large-scale mixed flow hydropower unit is calculated under the rated head and flow rate with the guide vanes fully opened, but the unit will not actually operate under such conditions all the time. It is more practical to operate under non-rated heads and different guide vane openings. The real-time size of the unit's water hammer time constant is closely related to the head height and guide vane opening position. The water hammer time constant at high head and low head at the same operating point is very different. Summary of the invention

[0003] According to the present invention, an adaptive turbine water hammer time constant calculation method and system are provided to solve the technical problem that the water hammer time constant in the current hydropower unit stability calculation model is inconsistent with the change of water head and guide vane opening.

[0004] According to a first aspect of the present invention, there is provided an adaptive method for calculating a water hammer time constant of a hydraulic turbine, comprising:

[0005] Based on the length of the water diversion pipe of the turbine, the cross-sectional area of ​​the water diversion pipe, any water head, the flow rate under any guide vane opening and the gravity acceleration, determine the calculation formula of the water hammer time constant of the turbine;

[0006] In unit time, based on the outflow angle at the guide vane outlet, the runner blade outlet angle, the guide vane height, η r The calculation formula for the flow rate per unit time of the turbine is determined by the blade efficiency, hydraulic efficiency, flow area at the outlet edge of the runner blade, gravity acceleration, turbine working head, angular velocity at the outlet of the water guide blade, and radius at the outlet of the water guide blade;

[0007] Under the condition that the turbine speed and guide vane height remain unchanged, based on the calculation formula of the turbine flow rate per unit time, determine the turbine flow rate assuming that the blade efficiency and hydraulic efficiency are constant;

[0008] Based on the assumed blade efficiency and hydraulic efficiency and assuming a constant turbine flow, an adaptive water hammer time constant under time-varying parameters is calculated.

[0009] Optionally, based on the length of the water diversion pipe of the turbine, the cross-sectional area of ​​the water diversion pipe, any water head, the flow rate at any guide vane opening, and the gravitational acceleration, a calculation formula for determining the water hammer time constant of the turbine includes:

[0010] Determine the turbine water hammer time constant according to the following formula:

[0011]

[0012] Where, T w is the water hammer time constant of the turbine, L is the length of the water diversion pipe of the turbine, unit: m; A is the cross-sectional area of ​​the water diversion pipe, unit: m 2 ;H r is any water head, unit: m; Q r is the flow rate at any guide vane opening, unit: m 3 / sec; g is the acceleration due to gravity, m / sec 2 .

[0013] Optionally, in unit time, based on the outflow angle at the guide vane outlet, the runner blade outlet angle, the guide vane height, η r The calculation formula for determining the flow rate per unit time of the turbine is based on the blade efficiency, hydraulic efficiency, flow area at the outlet edge of the runner blade, gravity acceleration, turbine working head, angular velocity at the outlet of the guide blade, and radius at the outlet of the guide blade, including:

[0014] Determine the flow rate per unit time of the turbine according to the following formula:

[0015]

[0016] Where, Q is the flow rate per unit time of the turbine, α0 is the outflow angle at the guide vane outlet, β2 is the outlet angle of the runner blade, b0 is the guide vane height, η r is the blade efficiency, η g is the hydraulic efficiency, A2 is the flow area at the outlet of the runner blade, g is the gravitational acceleration, H is the working water head of the turbine, ω is the angular velocity at the outlet of the water guide blade, and r is the radius of the outlet of the water guide blade.

[0017] Optionally, when the turbine speed and guide vane height remain unchanged, based on the calculation formula of the turbine flow rate per unit time, the turbine flow rate assuming that the blade efficiency and the hydraulic efficiency are constant is determined, including:

[0018] The turbine flow rate assuming constant blade efficiency and hydraulic efficiency is determined according to the following formula:

[0019] Q=f(α0,β2,H)

[0020] When the turbine speed and guide vane height remain unchanged, the turbine flow rate is only related to the water head, guide vane outlet angle and wheel blade outlet angle.

[0021] Optionally, based on the assumed blade efficiency and hydraulic efficiency assuming a constant turbine flow, an adaptive water hammer time constant under time-varying parameters is calculated, including:

[0022] In the turbine units that have been built for power generation, the length and cross-sectional area of ​​the water diversion pipe are constant, and the water hammer time constant T w Relevant only for flow and head:

[0023] T w =f(Q,H)

[0024] That is, the water hammer time constant Tw is related to the water head, the guide vane outlet angle and the wheel blade outlet angle:

[0025] T w =f(α0,β2,H)

[0026] Among them, the flow rate Q under any water head and guide vane opening is calculated based on the parameter information of water head, guide vane opening, water diversion pipe length, and water diversion pipe cross-sectional area. r .

[0027] According to another aspect of the present invention, there is also provided an adaptive hydraulic turbine water hammer time constant calculation system, comprising:

[0028] The module for determining the water hammer time constant of the hydraulic turbine is used to determine the calculation formula of the water hammer time constant of the hydraulic turbine based on the length of the hydraulic turbine water diversion pipe, the cross-sectional area of ​​the water diversion pipe, any water head, the flow rate under any guide vane opening and the gravity acceleration;

[0029] The module for determining the flow rate per unit time of the turbine is used to determine the flow rate per unit time based on the outflow angle at the guide vane outlet, the outlet angle of the runner blade, the guide vane height, η r The calculation formula for the flow rate per unit time of the turbine is determined by the blade efficiency, hydraulic efficiency, flow area at the outlet edge of the runner blade, gravity acceleration, turbine working head, angular velocity at the outlet of the water guide blade, and radius at the outlet of the water guide blade;

[0030] The turbine flow determination module is used to determine the turbine flow assuming that the turbine blade efficiency and hydraulic efficiency are constant based on the calculation formula of the turbine flow per unit time when the turbine speed and guide vane height remain unchanged;

[0031] The module for calculating the adaptive water hammer time constant is used to calculate the adaptive water hammer time constant under time-varying parameters based on the assumed turbine flow rate assuming constant blade efficiency and hydraulic efficiency.

[0032] Optionally, a module for determining a water hammer time constant of a hydraulic turbine comprises:

[0033] Determine the turbine water hammer time constant according to the following formula:

[0034]

[0035] Where, T wis the water hammer time constant of the turbine, L is the length of the water diversion pipe of the turbine, unit: m; A is the cross-sectional area of ​​the water diversion pipe, unit: m 2 ;H r is any water head, unit: m; Q r is the flow rate at any guide vane opening, unit: m 3 / sec; g is the acceleration due to gravity, m / sec 2 .

[0036] Optionally, a module for determining the flow rate per unit time of a water turbine includes:

[0037] Determine the flow rate per unit time of the turbine according to the following formula:

[0038]

[0039] Where, Q is the flow rate per unit time of the turbine, α0 is the outflow angle at the guide vane outlet, β2 is the outlet angle of the runner blade, b0 is the guide vane height, η r is the blade efficiency, η g is the hydraulic efficiency, A2 is the flow area at the outlet of the runner blade, g is the gravitational acceleration, H is the working water head of the turbine, ω is the angular velocity at the outlet of the water guide blade, and r is the radius of the outlet of the water guide blade.

[0040] Optionally, a turbine flow module is determined, including:

[0041] The submodule for determining the turbine flow rate is used to determine the turbine flow rate assuming that the blade efficiency and hydraulic efficiency are constant according to the following formula:

[0042] Q=f(α0,β2,H)

[0043] When the turbine speed and guide vane height remain unchanged, the turbine flow rate is only related to the water head, guide vane outlet angle and wheel blade outlet angle.

[0044] Optionally, a module for calculating an adaptive water hammer time constant is provided, including:

[0045] The adaptive water hammer time constant calculation submodule is used for the turbine units that have been built for power generation. The length and cross-sectional area of ​​the water diversion pipe are constant. The water hammer time constant T w Relevant only for flow and head:

[0046] T w =f(Q,H)

[0047] That is, the water hammer time constant Tw is related to the water head, the guide vane outlet angle and the wheel blade outlet angle:

[0048] T w =f(α0,β2,H)

[0049] Among them, the flow rate Q under any water head and guide vane opening is calculated based on the water head, guide vane opening, water diversion pipe length, and water diversion pipe cross-sectional area parameter information. r .

[0050] Therefore, the water hammer time constant of the hydraulic turbine simulation model in the power system stability calculation can be automatically corrected to a suitable value as the unit water head and guide vane opening change. By using the relationship between the water hammer time constant and the water head, flow rate, and guide vane opening in the hydraulic turbine simulation model, a real-time water hammer time constant is introduced into the model to realize the time-varying nature of the unit water hammer time constant. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0052] Figure 1 A schematic flow chart of a method for calculating a water hammer time constant of an adaptive hydraulic turbine according to the present embodiment;

[0053] Figure 2 It is a schematic diagram of the adaptive water hammer time constant of the hydraulic turbine according to the present embodiment;

[0054] Figure 3 Schematic diagram of an adaptive turbine water hammer time constant calculation system described in this embodiment. DETAILED DESCRIPTION

[0055] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0056] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0057] According to a first aspect of the present invention, an adaptive hydraulic turbine water hammer time constant calculation method 100 is provided, referring to Figure 1 As shown, the method 100 includes:

[0058] S101: Determine a calculation formula for a water hammer time constant of a water turbine based on the length of the water turbine diversion pipe, the cross-sectional area of ​​the water turbine diversion pipe, an arbitrary water head, a flow rate at an arbitrary guide vane opening, and gravity acceleration;

[0059] S102: In unit time, based on the outflow angle at the guide vane outlet, the runner blade outlet angle, the guide vane height, η r The calculation formula for the flow rate per unit time of the turbine is determined by the blade efficiency, hydraulic efficiency, flow area at the outlet edge of the runner blade, gravity acceleration, turbine working head, angular velocity at the outlet of the water guide blade, and radius at the outlet of the water guide blade;

[0060] S103: Under the condition that the turbine speed and the guide vane height remain unchanged, based on the calculation formula of the turbine flow rate per unit time, determine the turbine flow rate assuming that the blade efficiency and the hydraulic efficiency are constant;

[0061] S104: Based on the assumed blade efficiency and hydraulic efficiency, assuming a constant turbine flow, calculate an adaptive water hammer time constant under time-varying parameters.

[0062] Specifically, refer to Figure 2 As shown in the figure, the most critical point of this adaptive turbine water hammer time constant modeling method is to introduce time-varying parameters into the water hammer time constant calculation formula instead of fixed quantities in theoretical calculations, namely, the functional relationship between water head, guide vane opening, water diversion pipe length, and water diversion pipe cross-sectional area. The time-varying nature of the water hammer time constant ensures the consistency between the turbine water hammer time constant and the actual operating conditions of the unit under any water head and guide vane opening, avoids the gap between the water hammer time constant in the power system stability calculation model and the actual operation of the unit, and makes the water hammer time constant adaptive.

[0063] First, the turbine water hammer time constant T w The calculation formula of the time-varying parameters is as follows:

[0065] Where, L is the length of the water diversion pipe of the turbine, unit: m; A is the cross-sectional area of ​​the water diversion pipe, unit: m 2 ;H r is any water head, unit: m; Q r is the flow rate at any guide vane opening, unit: m 3 / sec; g is the acceleration due to gravity, m / sec 2 .

[0066] According to the first flow regulation equation of the turbine:

[0067]

[0068] Where Q is the flow rate per unit time of the turbine, α0 is the outflow angle at the guide vane outlet, β2 is the outlet angle of the runner blade, b0 is the guide vane height, η r is the blade efficiency, η g is the hydraulic efficiency, A2 is the flow area at the outlet of the runner blade, g is the gravitational acceleration, H is the working water head of the turbine, ω is the angular velocity at the outlet of the water guide blade, and r is the radius of the outlet of the water guide blade.

[0069] When the turbine speed and guide vane height remain unchanged, the turbine flow rate is only related to the water head, guide vane outlet angle and wheel blade outlet angle (the wheel blade efficiency and hydraulic efficiency are assumed to be constant).

[0070] Q=f(α0,β2,H)

[0071] In the turbine units that have been built for power generation, the length and cross-sectional area of ​​the water diversion pipe are constant, so the water hammer time constant T w Only relevant to flow and head.

[0072] T w =f(Q,H)

[0073] That is, the water hammer time constant T w It is related to the water head, guide vane outlet angle and wheel blade outlet angle.

[0074] T w =f(α0,β2,H)

[0075] Secondly, according to the water head, guide vane opening, water diversion pipe length, and water diversion pipe cross-sectional area parameter information, the flow rate Q under any water head and guide vane opening is calculated. r .

[0076] Finally, the adaptive water hammer time constant T under time-varying parameters is calculated according to the calculation formula: w .

[0077] Therefore, the water hammer time constant of the turbine unit in the power system simulation model can be effectively solved under different water heads and guide vane openings, and the water hammer time constant in the stable calculation model can be guaranteed to be adaptable under full water head and full guide vane stroke in real time.

[0078] Optionally, based on the length of the water diversion pipe of the turbine, the cross-sectional area of ​​the water diversion pipe, any water head, the flow rate at any guide vane opening, and the gravitational acceleration, a calculation formula for determining the water hammer time constant of the turbine includes:

[0079] Determine the turbine water hammer time constant according to the following formula:

[0080]

[0081] Where, Tw is the water hammer time constant of the turbine, L is the length of the water diversion pipe of the turbine, unit: m; A is the cross-sectional area of ​​the water diversion pipe, unit: m 2 ;H r is any water head, unit: m; Q r is the flow rate at any guide vane opening, unit: m 3 / sec; g is the acceleration due to gravity, m / sec 2 .

[0082] Optionally, in unit time, based on the outflow angle at the guide vane outlet, the runner blade outlet angle, the guide vane height, η r The calculation formula for determining the flow rate per unit time of the turbine is based on the blade efficiency, hydraulic efficiency, flow area at the outlet edge of the runner blade, gravity acceleration, turbine working head, angular velocity at the outlet of the guide blade, and radius at the outlet of the guide blade, including:

[0083] Determine the flow rate per unit time of the turbine according to the following formula:

[0084]

[0085] Where Q is the flow rate per unit time of the turbine, α0 is the outflow angle at the guide vane outlet, β2 is the outlet angle of the runner blade, b0 is the guide vane height, η r is the blade efficiency, η g is the hydraulic efficiency, A2 is the flow area at the outlet of the runner blade, g is the gravitational acceleration, H is the working water head of the turbine, ω is the angular velocity at the outlet of the water guide blade, and r is the radius of the outlet of the water guide blade.

[0086] Optionally, when the turbine speed and guide vane height remain unchanged, based on the calculation formula of the turbine flow rate per unit time, the turbine flow rate assuming that the blade efficiency and the hydraulic efficiency are constant is determined, including:

[0087] The turbine flow rate assuming constant blade efficiency and hydraulic efficiency is determined according to the following formula:

[0088] Q=f(α0,β2,H)

[0089] When the turbine speed and guide vane height remain unchanged, the turbine flow rate is only related to the water head, guide vane outlet angle and wheel blade outlet angle.

[0090] Optionally, based on the assumed blade efficiency and hydraulic efficiency assuming a constant turbine flow, an adaptive water hammer time constant under time-varying parameters is calculated, including:

[0091] In the turbine units that have been built for power generation, the length and cross-sectional area of ​​the water diversion pipe are constant, and the water hammer time constant T wRelevant only for flow and head:

[0092] T w =f(Q,H)

[0093] That is, the water hammer time constant Tw is related to the water head, the guide vane outlet angle and the wheel blade outlet angle:

[0094] T w =f(α0,β2,H)

[0095] Among them, the flow rate Q under any water head and guide vane opening is calculated based on the parameter information of water head, guide vane opening, water diversion pipe length, and water diversion pipe cross-sectional area. r .

[0096] Therefore, the water hammer time constant of the hydraulic turbine simulation model in the power system stability calculation can be automatically corrected to a suitable value as the unit water head and guide vane opening change. By using the relationship between the water hammer time constant and the water head, flow rate, and guide vane opening in the hydraulic turbine simulation model, a real-time water hammer time constant is introduced into the model to realize the time-varying nature of the unit water hammer time constant.

[0097] According to another aspect of the present invention, there is also provided an adaptive hydraulic turbine water hammer time constant calculation system 300, the system 300 comprising:

[0098] A module 310 for determining a water hammer time constant of a water turbine is used to determine a calculation formula for a water hammer time constant of a water turbine based on a length of a water diversion pipe of the water turbine, a cross-sectional area of ​​the water diversion pipe, an arbitrary water head, a flow rate under an arbitrary guide vane opening, and gravity acceleration;

[0099] The flow rate per unit time module 320 is used to determine the flow rate per unit time based on the outflow angle at the guide vane outlet, the outlet angle of the runner blade, the guide vane height, η r The calculation formula for the flow rate per unit time of the turbine is determined by the blade efficiency, hydraulic efficiency, flow area at the outlet edge of the runner blade, gravity acceleration, turbine working head, angular velocity at the outlet of the water guide blade, and radius at the outlet of the water guide blade;

[0100] The turbine flow determination module 330 is used to determine the turbine flow assuming that the turbine blade efficiency and the hydraulic efficiency are constant based on the calculation formula of the flow per unit time of the turbine when the turbine speed and the guide vane height remain unchanged;

[0101] The module 340 for calculating the adaptive water hammer time constant is used to calculate the adaptive water hammer time constant under time-varying parameters based on the assumed blade efficiency and hydraulic efficiency and assuming a constant turbine flow.

[0102] Optionally, a module for determining a water hammer time constant of a hydraulic turbine comprises:

[0103] Determine the turbine water hammer time constant according to the following formula:

[0104]

[0105] Where, T w is the water hammer time constant of the turbine, L is the length of the water diversion pipe of the turbine, unit: m; A is the cross-sectional area of ​​the water diversion pipe, unit: m 2 ;H r is any water head, unit: m; Q r is the flow rate at any guide vane opening, unit: m 3 / sec; g is the acceleration due to gravity, m / sec 2 .

[0106] Optionally, a module for determining the flow rate per unit time of a water turbine includes:

[0107] Determine the flow rate per unit time of the turbine according to the following formula:

[0108]

[0109] Where Q is the flow rate per unit time of the turbine, α0 is the outflow angle at the guide vane outlet, β2 is the outlet angle of the runner blade, b0 is the guide vane height, η r is the blade efficiency, η g is the hydraulic efficiency, A2 is the flow area at the outlet of the runner blade, g is the gravitational acceleration, H is the working water head of the turbine, ω is the angular velocity at the outlet of the water guide blade, and r is the radius of the outlet of the water guide blade.

[0110] Optionally, a turbine flow module is determined, including:

[0111] The submodule for determining the turbine flow rate is used to determine the turbine flow rate assuming that the blade efficiency and hydraulic efficiency are constant according to the following formula:

[0112] Q=f(α0,β2,H)

[0113] When the turbine speed and guide vane height remain unchanged, the turbine flow rate is only related to the water head, guide vane outlet angle and wheel blade outlet angle.

[0114] Optionally, a module for calculating an adaptive water hammer time constant is provided, including:

[0115] The adaptive water hammer time constant calculation submodule is used for the turbine units that have been built for power generation. The length and cross-sectional area of ​​the water diversion pipe are constant. The water hammer time constant T w Relevant only for flow and head:

[0116] T w =f(Q,H)

[0117] That is, the water hammer time constant Tw is related to the water head, the guide vane outlet angle and the wheel blade outlet angle:

[0118] T w =f(α0,β2,H)

[0119] Among them, the flow rate Q under any water head and guide vane opening is calculated based on the parameter information of water head, guide vane opening, water diversion pipe length, and water diversion pipe cross-sectional area. r .

[0120] An adaptive hydraulic turbine water hammer time constant calculation system 300 according to an embodiment of the present invention corresponds to an adaptive hydraulic turbine water hammer time constant calculation method 100 according to another embodiment of the present invention, and will not be described in detail herein.

[0121] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiments of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0122] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0123] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0124] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0125] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0126] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. An adaptive method for calculating water hammer time constant of a hydraulic turbine, characterized in that: include: Based on the length of the water diversion pipe of the turbine, the cross-sectional area of ​​the water diversion pipe, any water head, the flow rate under any guide vane opening and the gravity acceleration, determine the calculation formula of the water hammer time constant of the turbine; In unit time, based on the outflow angle at the guide vane outlet, the runner blade outlet angle, the guide vane height, η r The calculation formula for the flow rate per unit time of the turbine is determined by the blade efficiency, hydraulic efficiency, flow area at the outlet edge of the runner blade, gravity acceleration, turbine working head, angular velocity at the outlet of the water guide blade, and radius at the outlet of the water guide blade; Under the condition that the turbine speed and guide vane height remain unchanged, based on the calculation formula of the turbine flow rate per unit time, determine the turbine flow rate assuming that the blade efficiency and hydraulic efficiency are constant; Based on the assumed blade efficiency and hydraulic efficiency and assuming a constant turbine flow, an adaptive water hammer time constant under time-varying parameters is calculated.

2. The method according to claim 1, characterized in that Based on the length of the water diversion pipe of the turbine, the cross-sectional area of ​​the water diversion pipe, any water head, the flow rate under any guide vane opening, and the gravity acceleration, a calculation formula for determining the water hammer time constant of the turbine includes: Determine the turbine water hammer time constant according to the following formula: Where, T w is the water hammer time constant of the turbine, L is the length of the water diversion pipe of the turbine, unit: m; A is the cross-sectional area of ​​the water diversion pipe, unit: m 2 ;H r is any water head, unit: m; Q r is the flow rate at any guide vane opening, unit: m 3 / sec; g is the acceleration due to gravity, m / sec 2 .

3. The method according to claim 1, characterized in that In unit time, based on the outflow angle at the guide vane outlet, the runner blade outlet angle, the guide vane height, η r The calculation formula for determining the flow rate per unit time of the turbine is based on the blade efficiency, hydraulic efficiency, flow area at the outlet edge of the runner blade, gravity acceleration, turbine working head, angular velocity at the outlet of the guide blade, and radius at the outlet of the guide blade, including: Determine the flow rate per unit time of the turbine according to the following formula: Where, Q is the flow rate per unit time of the turbine, α0 is the outflow angle at the guide vane outlet, β2 is the outlet angle of the runner blade, b0 is the guide vane height, η r is the blade efficiency, η g is the hydraulic efficiency, A2 is the flow area at the outlet of the runner blade, g is the gravitational acceleration, H is the working water head of the turbine, ω is the angular velocity at the outlet of the water guide blade, and r is the radius of the outlet of the water guide blade.

4. The method according to claim 1, characterized in that: Under the condition that the turbine speed and guide vane height remain unchanged, based on the calculation formula of the turbine flow rate per unit time, determine the turbine flow rate assuming that the blade efficiency and hydraulic efficiency are constant, including: The turbine flow rate assuming constant blade efficiency and hydraulic efficiency is determined according to the following formula: Q=f(α0,β2,H) When the turbine speed and guide vane height remain unchanged, the turbine flow rate is only related to the water head, guide vane outlet angle and wheel blade outlet angle.

5. The method according to claim 1, characterized in that Based on the assumed blade efficiency and hydraulic efficiency, assuming a constant turbine flow, the adaptive water hammer time constant under time-varying parameters is calculated, including: In the turbine units that have been built for power generation, the length and cross-sectional area of ​​the water diversion pipe are constant, and the water hammer time constant T w Relevant only for flow and head: T w =f(Q,H) That is, the water hammer time constant Tw is related to the water head, the guide vane outlet angle and the wheel blade outlet angle: T w =f(α0,β2,H) Among them, the flow rate Q under any water head and guide vane opening is calculated based on the parameter information of water head, guide vane opening, water diversion pipe length, and water diversion pipe cross-sectional area. r .

6. An adaptive hydraulic turbine water hammer time constant calculation system, characterized in that: include: The module for determining the water hammer time constant of the hydraulic turbine is used to determine the calculation formula of the water hammer time constant of the hydraulic turbine based on the length of the hydraulic turbine water diversion pipe, the cross-sectional area of ​​the water diversion pipe, any water head, the flow rate under any guide vane opening and the gravity acceleration; The module for determining the flow rate per unit time of the turbine is used to determine the flow rate per unit time based on the outflow angle at the guide vane outlet, the outlet angle of the runner blade, the guide vane height, η r The calculation formula for the flow rate per unit time of the turbine is determined by the blade efficiency, hydraulic efficiency, flow area at the outlet edge of the runner blade, gravity acceleration, turbine working head, angular velocity at the outlet of the water guide blade, and radius at the outlet of the water guide blade; The turbine flow determination module is used to determine the turbine flow assuming that the turbine blade efficiency and hydraulic efficiency are constant based on the calculation formula of the turbine flow per unit time when the turbine speed and guide vane height remain unchanged; The module for calculating the adaptive water hammer time constant is used to calculate the adaptive water hammer time constant under time-varying parameters based on the assumed turbine flow rate assuming constant blade efficiency and hydraulic efficiency.

7. The system according to claim 6, characterized in that Module for determining the water hammer time constant of a hydraulic turbine, including: Determine the turbine water hammer time constant according to the following formula: Where, T w is the water hammer time constant of the turbine, L is the length of the water diversion pipe of the turbine, unit: m; A is the cross-sectional area of ​​the water diversion pipe, unit: m 2 ;H r is any water head, unit: m; Q r is the flow rate at any guide vane opening, unit: m 3 / sec; g is the acceleration due to gravity, m / sec 2 .

8. The system according to claim 6, characterized in that The module for determining the flow rate per unit time of the turbine includes: Determine the flow rate per unit time of the turbine according to the following formula: Where, Q is the flow rate per unit time of the turbine, α0 is the outflow angle at the guide vane outlet, β2 is the outlet angle of the runner blade, b0 is the guide vane height, η r is the blade efficiency, η g is the hydraulic efficiency, A2 is the flow area at the outlet of the runner blade, g is the gravitational acceleration, H is the working water head of the turbine, ω is the angular velocity at the outlet of the water guide blade, and r is the radius of the outlet of the water guide blade.

9. The system according to claim 6, characterized in that Module for determining turbine flow, including: The submodule for determining the turbine flow rate is used to determine the turbine flow rate assuming that the blade efficiency and hydraulic efficiency are constant according to the following formula: Q=f(α0,β2,H) When the turbine speed and guide vane height remain unchanged, the turbine flow rate is only related to the water head, guide vane outlet angle and wheel blade outlet angle.

10. The system according to claim 6, characterized in that Module for calculating adaptive water hammer time constant, including: The adaptive water hammer time constant calculation submodule is used for the turbine units that have been built for power generation. The length and cross-sectional area of ​​the water diversion pipe are constant. The water hammer time constant T w Relevant only for flow and head: T w =f(Q,H) That is, the water hammer time constant Tw is related to the water head, the guide vane outlet angle and the wheel blade outlet angle: T w =f(α0,β2,H) Among them, the flow rate Q under any water head and guide vane opening is calculated based on the parameter information of water head, guide vane opening, water diversion pipe length, and water diversion pipe cross-sectional area. r .

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