A method and device for identifying the relationship between the guide vane opening and the servomotor stroke of a water turbine

Abstract

The present invention discloses a method and device for identifying the relationship between the guide vane opening and the servomotor stroke of a water turbine, the method comprising: obtaining the active power of a water turbine generator set under different servomotor strokes through real machine testing, and converting the constructed servomotor stroke and active power curve to obtain the relationship between the servomotor stroke and the unit torque of the water turbine; obtaining the water turbine torque characteristic curve under different guide vane openings according to the comprehensive characteristic curve of the water turbine model, and interpolating the water turbine torque characteristic curve to obtain the relationship between the guide vane opening and the unit torque of the water turbine; obtaining the relationship between the guide vane opening and the servomotor stroke according to the relationship between the servomotor stroke and the unit torque of the water turbine and the relationship between the guide vane opening and the unit torque of the water turbine. The present invention adopts the method of real machine testing and model comprehensive characteristic curve calculation, which can quickly and easily obtain the accurate relationship between the guide vane opening and the servomotor stroke, and provide accurate boundary conditions for the modeling and simulation of the regulation system.

Description

Technical Field

[0001] The invention relates to the technical field of water turbines, and in particular to a method and a device for identifying the relationship between a water turbine guide vane opening and a servomotor stroke. Background Art

[0002] With the construction of my country's new power system, the peak load and frequency regulation pressure of the power grid has increased after the large-scale integration of new energy sources into the power grid. Conventional hydro-turbine generator sets have the characteristics of flexible regulation and rapid response. Improving the regulation ability of hydro-turbine generator sets is of great significance to the safety and stability of the power grid under the new power system and the digestion and absorption of new energy sources. The core of the turbine is the turbine governor. The turbine governor collects the relay stroke signal and calculates it to output the target adjustment value of the guide vane opening. After the electro-hydraulic conversion and hydraulic discharge, the guide vane servomotor is driven to adjust the guide vane opening to change the output of the turbine. The turbine governor can only collect the relay stroke signal, and ultimately needs to adjust the guide vane opening to adjust the flow and processing of the turbine. Due to the influence of structural components, the relay stroke and the guide vane opening have an obvious nonlinear relationship. Therefore, accurately obtaining the relationship between the guide vane opening and the relay stroke is of great significance to the modeling and simulation of the turbine speed control system and the optimization of the control strategy.

[0003] At present, the relationship between the servomotor stroke and the guide vane opening is often not considered in the modeling and simulation of the turbine speed control system, which makes it impossible to accurately simulate the characteristics of the turbine speed control system, affecting the accuracy of the actual measurement of the dynamic characteristics of the turbine speed control system and the calculation of the load rejection transition process. At present, in order to obtain the accurate relationship between the servomotor stroke and the guide vane opening, the servomotor stroke and the guide vane opening are often measured on site. It is necessary to wait until the water flow in the flow channel is emptied during the maintenance of the turbine generator unit, and then personnel enter the unit for manual measurement, which consumes a lot of manpower and material resources, and the measurement results are affected by human factors and have large errors. Summary of the invention

[0004] Based on this, the present invention provides a method and device for identifying the relationship between the guide vane opening and the relay stroke of a turbine, so as to solve the problem that on-site measurement of the relay stroke and guide vane opening requires shutdown for maintenance, is time-consuming and labor-intensive, and has low measurement accuracy.

[0005] Based on the above purpose, the present invention provides a method for identifying the relationship between the guide vane opening and the servomotor stroke of a water turbine, comprising:

[0006] The active power of the generator of the hydro-turbine generator set under different relay strokes is obtained through real machine testing, and the relay stroke and generator active power curve is constructed;

[0007] Converting the servomotor stroke and the generator active power curve to obtain the relationship between the servomotor stroke and the turbine unit torque;

[0008] According to the comprehensive characteristic curve of the turbine model, the turbine torque characteristic curve under different guide vane openings is obtained;

[0009] Interpolating the turbine torque characteristic curve according to the turbine unit torque under different servomotor strokes to obtain the relationship between the guide vane opening and the turbine unit torque;

[0010] According to the relationship between the servomotor stroke and the unit moment of the turbine and the relationship between the guide vane opening and the unit moment of the turbine, the relationship between the guide vane opening and the servomotor stroke is obtained.

[0011] Preferably, the converting process of the servomotor stroke and the generator active power curve to obtain the relationship between the servomotor stroke and the turbine unit torque includes:

[0012] Obtaining a generator efficiency curve, and obtaining the generator efficiency under different working conditions from the generator efficiency curve;

[0013] Inputting the generator efficiency into a preset turbine output conversion model to obtain the turbine output corresponding to the generator active power;

[0014] According to the preset torque and output conversion model and the preset unit torque conversion model, the unit torque of the turbine under different servomotor strokes is obtained, and the relationship between the servomotor stroke and the unit torque of the turbine is established.

[0015] Preferably, the turbine output conversion model is:

[0016]

[0017] Wherein, P is the turbine output, W is the generator active power, and η is the generator efficiency;

[0018] The torque and output conversion model is:

[0019]

[0020] Wherein, M is the turbine torque, R w is the turbine speed;

[0021] The unit moment conversion model is:

[0022]

[0023] Among them, M 11 is the unit torque of the turbine, D is the runner diameter of the turbine, and H is the head condition of the turbine.

[0024] Preferably, the step of obtaining the turbine torque characteristic curve under different guide vane openings according to the comprehensive characteristic curve of the turbine model includes:

[0025] Obtain comprehensive characteristic curve of turbine model;

[0026] The unit flow, unit speed and operating point efficiency of the turbine are obtained from the comprehensive characteristic curve of the turbine model along different guide vane equal opening lines, and a unit flow matrix, a unit speed matrix and an operating point efficiency matrix are constructed;

[0027] Inputting the unit flow matrix, the unit speed matrix and the operating point efficiency matrix into a preset unit torque conversion model to obtain a unit torque matrix of the hydraulic turbine;

[0028] A turbine torque characteristic curve is constructed according to the unit speed matrix and the unit torque matrix.

[0029] Preferably, the unit torque conversion model is:

[0030]

[0031] Among them, M ij is the unit moment matrix of the turbine, Q ij is the unit flow matrix, R ij is the unit speed matrix, η ij is the efficiency matrix of the operating point, and λ is the conversion coefficient.

[0032] Preferably, interpolating the turbine torque characteristic curve according to the turbine unit torque under different servomotor strokes to obtain the relationship between the guide vane opening and the turbine unit torque includes:

[0033] According to the unit torque of the turbine obtained by the real machine test, the target unit speed matrix corresponding to different guide vane opening lines is interpolated in the turbine torque characteristic curve;

[0034] Calculate the target unit speed of the real machine test under the water head condition;

[0035] According to the target unit speed and the target unit speed matrix, the guide vane opening corresponding to the unit torque of the turbine is interpolated, and a relationship between the guide vane opening and the unit torque of the turbine is constructed.

[0036] Preferably, the target unit speed is calculated as follows:

[0037]

[0038] Among them, R1′1 is the target unit speed, R dis the rotation speed of the hydro-generator set, D is the runner diameter of the turbine, and H is the water head condition of the turbine.

[0039] In addition, the present invention also provides a device for identifying the relationship between the guide vane opening of a water turbine and the stroke of a servomotor, comprising:

[0040] The real machine test module is used to obtain the active power of the generator of the hydro-generator set under different relay strokes through real machine testing, and to construct the relay stroke and generator active power curve;

[0041] A conversion processing module, used for converting the servomotor stroke and the generator active power curve to obtain the relationship between the servomotor stroke and the turbine unit torque;

[0042] A characteristic curve acquisition module is used to acquire a turbine torque characteristic curve under different guide vane openings according to a comprehensive characteristic curve of a turbine model;

[0043] An interpolation processing module, used for interpolating the turbine torque characteristic curve according to the turbine unit torque under different relay strokes to obtain the relationship between the guide vane opening and the turbine unit torque;

[0044] The relationship identification module is used to obtain the relationship between the guide vane opening and the relay stroke according to the relationship between the relay stroke and the turbine unit torque and the relationship between the guide vane opening and the turbine unit torque.

[0045] Preferably, the conversion processing module includes:

[0046] A curve processing submodule, used to obtain a generator efficiency curve, and obtain the generator efficiency under different working conditions from the generator efficiency curve;

[0047] An output conversion submodule, used for inputting the generator efficiency into a preset turbine output conversion model to obtain the turbine output corresponding to the active power of the generator;

[0048] The unit torque conversion submodule is used to obtain the unit torque of the turbine under different relay strokes according to the preset torque and output conversion model and the preset unit torque conversion model, and to construct the relationship between the relay stroke and the unit torque of the turbine.

[0049] Preferably, the characteristic curve acquisition module includes:

[0050] A comprehensive characteristic curve acquisition submodule is used to acquire a comprehensive characteristic curve of a turbine model;

[0051] A parameter matrix construction submodule is used to obtain the unit flow, unit speed and operating point efficiency of the turbine along different guide vane equal opening lines on the comprehensive characteristic curve of the turbine model, and to construct a unit flow matrix, a unit speed matrix and an operating point efficiency matrix;

[0052] A matrix conversion submodule, used for inputting the unit flow matrix, the unit speed matrix and the operating point efficiency matrix into a preset unit torque conversion model to obtain a unit torque matrix of the turbine;

[0053] The torque characteristic curve construction submodule is used to construct a turbine torque characteristic curve according to the unit speed matrix and the unit torque matrix.

[0054] As can be seen from the above, the method for identifying the relationship between the guide vane opening and the servomotor stroke of the turbine provided by the present invention obtains the unit torque of the turbine under different servomotor strokes through real machine testing, and constructs the relationship between the servomotor stroke and the unit torque of the turbine, and combines the relationship between the guide vane opening and the unit torque of the turbine obtained through the comprehensive characteristic curve of the turbine model, and obtains the relationship between the guide vane opening and the servomotor stroke according to the principle of equal unit torque. Compared with the existing modeling and simulation of the turbine regulating system, which does not consider the relationship between the guide vane opening and the servomotor stroke, or adopts the method of entering the unit on site for actual measurement, the method for identifying the relationship between the guide vane opening and the servomotor stroke of the turbine provided by the present invention, through real machine testing and model comprehensive characteristic curve calculation, identifies the accurate relationship between the guide vane opening and the servomotor stroke, and provides accurate boundary conditions for the accurate simulation of the turbine regulating system; at the same time, the identification is performed according to the external unit active power response, and the unit does not need to be shut down, the flow channel is emptied, and the servomotor stroke and the guide vane opening are actually measured, which has the advantages of being fast and simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0056] Figure 1 It is a flow chart of a method for identifying the relationship between the guide vane opening of a water turbine and the stroke of a servomotor in one embodiment of the present invention;

[0057] Figure 2 A comprehensive characteristic curve diagram of a water turbine model in one embodiment of the present invention;

[0058] Figure 3 A hydraulic turbine torque characteristic curve diagram in one embodiment of the present invention;

[0059] Figure 4 Schematic diagram of the structure of a device for identifying the relationship between the guide vane opening and the servomotor stroke of a water turbine in one embodiment of the present invention. DETAILED DESCRIPTION

[0060] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0061] like Figure 1 As shown, a method for identifying the relationship between the guide vane opening and the servomotor stroke of a water turbine provided by an embodiment of the present invention specifically comprises the following steps:

[0062] Step S10, obtaining the active power of the generator of the hydro-generator set under different servomotor strokes through real machine testing, and constructing a servomotor stroke and generator active power curve.

[0063] Specifically, a variable load test of the hydro-turbine generator set is carried out, with a preset load as the interval, and the actual machine test is used to obtain the different relay strokes {Y1, Y2, …, Y k The corresponding generator active power {W1,W2,…,W n}, and then according to k different relay strokes Y i (i=1,2,…,k) and the corresponding generator active power P i Construct a servomotor stroke and generator active power curve Y=f(W). Optionally, the preset load is 10%. Wherein, k is the measured number of servomotor strokes.

[0064] Step S20, converting the servomotor stroke and the generator active power curve to obtain the relationship between the servomotor stroke and the turbine unit torque.

[0065] Specifically, after obtaining the servomotor stroke and generator active power curve Y=f(W) through real machine testing, firstly, the servomotor strokes {Y1, Y2, …, Y k The turbine output {P1,P2,…,P k}, and then obtain the servomotor stroke and turbine output curve Y = f (P), and then according to the relationship between turbine output and turbine unit torque, obtain the servomotor stroke and turbine unit torque relationship Y = f (M 11 ).

[0066] Preferably, step S20 includes the following steps:

[0067] Step S201, obtaining a generator efficiency curve, and obtaining the generator efficiency under different working conditions from the generator efficiency curve.

[0068] Step S202, input the generator efficiency into a preset turbine output conversion model to obtain the turbine output corresponding to the generator active power; wherein the turbine output conversion model can be:

[0069]

[0070] Among them, P is the turbine output, W is the generator active power, and η is the generator efficiency.

[0071] Step S203, according to the preset torque and output conversion model and the preset unit torque conversion model, obtain the unit torque of the turbine under different relay strokes, and construct the relationship between the relay stroke and the unit torque of the turbine; wherein the torque and output conversion model can be:

[0072]

[0073] Where, M is the turbine torque, R w is the turbine speed.

[0074] And the unit moment conversion model can be:

[0075]

[0076] Among them, M 11 is the unit torque of the turbine, D is the runner diameter of the turbine, and H is the head condition of the turbine.

[0077] It is understandable that, after obtaining the relay stroke and generator active power curve Y=f(W) through real machine testing, the generator efficiency {η1,η2,…,η k}, and according to the turbine output conversion model shown in formula (1), the turbine output {P1, P2, …, P k Next, according to the torque and output conversion model shown in formula (2), the different relay strokes {Y1, Y2, …, Y k The turbine torque {M1,M2,…,M} under k}, and finally, according to the unit torque conversion model shown in formula (3), the different relay strokes {Y1, Y2, …, Y k The unit moment of the turbine under 11,1 ,M 11，2 ,…,M 11,k}, and then k different relay strokes Y i and the corresponding turbine unit moment M11,i Construct the relationship between the relay stroke and the turbine unit torque Y = f (M 11 ). In this embodiment, the relationship between the servomotor stroke and the unit torque of the turbine can be obtained through simple conversion processing, thereby improving the efficiency of constructing the relationship curve.

[0078] Step S30, obtaining a turbine torque characteristic curve under different guide vane openings according to the comprehensive characteristic curve of the turbine model.

[0079] In this embodiment, the comprehensive characteristic curve of the turbine model includes the unit flow rate Q 11 , Unit speed R 11 The relationship between the turbine torque characteristic curve includes the relationship between the unit speed and the unit torque. It should be noted that the above step S30 can also be performed before step S10 or step S20.

[0080] Preferably, step S30 includes the following steps:

[0081] Step S301, obtaining a comprehensive characteristic curve of a water turbine model.

[0082] Specifically, by conducting turbine model tests, Figure 2 The unit flow rate Q 11 is the horizontal axis, unit speed R 11 The comprehensive characteristic curve of the turbine model with the vertical axis is composed of the guide vane equal opening curve, equal efficiency curve, equal cavitation coefficient curve and other curves, which can accurately reflect the output, efficiency, flow rate, cavitation and other performances of the turbine.

[0083] Step S302, obtaining the unit flow, unit speed and operating point efficiency of the turbine from the comprehensive characteristic curve of the turbine model along the opening lines of different guide vanes, and constructing a unit flow matrix, a unit speed matrix and an operating point efficiency matrix.

[0084] Assume that there are n guide vane equal opening lines on the comprehensive characteristic curve of the turbine model, and m unit flow Q is obtained on each guide vane equal opening line. 11 , Unit speed R 11 and operating point efficiency η, the constructed multiple parameter matrices can be expressed as:

[0085]

[0086]

[0087]

[0088] Among them, Q ij is the unit flow matrix, R ijis the unit speed matrix, η ij is the operating point efficiency matrix.

[0089] Step S303: Input the unit flow matrix, the unit speed matrix and the operating point efficiency matrix into a preset unit torque conversion model to obtain the unit torque matrix of the turbine. The unit torque conversion model is:

[0090]

[0091] Among them, M ij is the unit moment matrix of the turbine, and λ is the conversion coefficient. Optionally, the conversion coefficient λ is 93.68.

[0092] It can be understood that the unit moment matrix M of the turbine is obtained through the above unit moment conversion model: ij It can be expressed as:

[0093]

[0094] Step S304: construct a turbine torque characteristic curve according to the unit speed matrix and the unit torque matrix.

[0095] Specifically, based on the above unit speed matrix R ij And the above unit moment matrix M ij and the unit speed R of the turbine 11 is the horizontal axis, unit moment M 11 As the ordinate, we can get the moment curves on n different guide vane opening lines, and then get Figure 3 The turbine torque characteristic curve M shown 11 =f(α,R 11 ), where α is the guide vane opening.

[0096] Step S40, interpolating the turbine torque characteristic curve according to the turbine unit torque under different relay strokes to obtain the relationship between the guide vane opening and the turbine unit torque.

[0097] In step S40, the turbine unit moment {M 11,1 ,M 11,2 ,…,M 11,k}(k is the number of relay strokes), in the turbine torque characteristic curve M 11 =f(α,R 11 ) uses the interpolation method to obtain the same turbine unit moment M 11 The corresponding guide vane opening α is obtained, so the relationship between the guide vane opening and the unit moment of the turbine is α = f(M 11 ).

[0098] Preferably, step S40 includes the following steps:

[0099] Step S401, based on the unit torque of the turbine obtained by the real machine test, a target unit speed matrix corresponding to different guide vane equal opening lines is interpolated in the turbine torque characteristic curve.

[0100] Step S402, calculating the target unit speed of the real machine test under the water head condition; wherein the calculation formula of the target unit speed is:

[0101]

[0102] Among them, R′ 11 is the target unit speed, R d is the rotation speed of the turbine generator set, D is the runner diameter of the turbine, and H is the water head condition of the turbine.

[0103] Step S403: According to the target unit speed and the target unit speed matrix, the guide vane opening corresponding to the unit torque of the turbine is interpolated, and the relationship between the guide vane opening and the unit torque of the turbine is constructed.

[0104] It can be understood that in this embodiment, the turbine output {P1, P2, ..., P k The corresponding turbine unit torque {M 11,1 ,M 11,2 ,…,M 11,k}After that, firstly according to the turbine unit moment {M 11,1 ,M 11,2 ,…,M 11,k}In the turbine torque characteristic curve M 11 =f(α,R 11 ) to obtain n different guide vane equal opening lines {α1,α2,…,α n} corresponds to the turbine unit moment M 11 Unit speed value {R 11,1 ,R 11,2 ,…,R 11,k}, and then construct the target unit speed matrix R′ ij , the target unit speed matrix R′ ij It can be expressed as:

[0105]

[0106] Among them, k is the number of turbine output measurement points obtained by real machine testing, and n is the number of guide vane equal opening lines in the comprehensive characteristic curve of the turbine.

[0107] Then, according to the target unit speed matrix R′ corresponding to different guide vane opening lines ij, combined with the target unit speed R′ calculated according to the above formula (9) under the measured water head condition 11 , in the turbine torque characteristic curve M 11 =f(α,R 11 ) to obtain the guide vane openings {α1,α2,…,α k}, and then by k different guide vane openings α and the corresponding unit moment M 11 Construct the relationship between the guide vane opening and the unit moment of the turbine α=f(M 11 ). In this embodiment, the relationship between the guide vane opening and the unit torque of the turbine is constructed by the interpolation method, so that the relationship curve can be accurately constructed.

[0108] Step S50, obtaining the relationship between the guide vane opening and the servomotor stroke according to the relationship between the servomotor stroke and the unit torque of the turbine and the relationship between the guide vane opening and the unit torque of the turbine.

[0109] That is, this embodiment obtains the guide vane opening and servomotor stroke relationship Y=f(α) according to the principle of unit moment equality. Further, the obtained guide vane opening and servomotor stroke relationship Y=f(α) is used to provide accurate boundary conditions for modeling and simulation of the turbine regulation system and calculation of the load rejection transient process, so as to ensure that the power response characteristics obtained by simulating the turbine regulation system are consistent with the actual situation.

[0110] As can be seen from the above, the method for identifying the relationship between the guide vane opening and the servomotor stroke of the turbine provided in this embodiment obtains the unit torque of the turbine under different servomotor strokes through real machine testing, and constructs the relationship between the servomotor stroke and the unit torque of the turbine, and combines the relationship between the guide vane opening and the unit torque of the turbine obtained through the comprehensive characteristic curve of the turbine model, and obtains the relationship between the guide vane opening and the servomotor stroke according to the principle of equal unit torque. Compared with the existing modeling and simulation of the turbine regulating system, which does not consider the relationship between the guide vane opening and the servomotor stroke, or adopts the method of entering the unit on site for actual measurement, the method for identifying the relationship between the guide vane opening and the servomotor stroke of the turbine provided in this embodiment, through real machine testing and model comprehensive characteristic curve calculation, identifies the accurate relationship between the guide vane opening and the servomotor stroke, and provides accurate boundary conditions for the accurate simulation of the turbine regulating system; at the same time, the identification is performed according to the external unit active power response, and the unit does not need to be shut down, the flow channel is emptied, and the servomotor stroke and the guide vane opening are actually measured, which has the advantages of being fast and simple.

[0111] like Figure 4As shown, in addition, corresponding to any of the above-mentioned embodiments and methods, an embodiment of the present invention further provides a device for identifying the relationship between the guide vane opening and the relay stroke of a water turbine, including a real machine testing module 110, a conversion processing module 120, a characteristic curve acquisition module 130, an interpolation processing module 140 and a relationship identification module 150, and the detailed description of each functional module is as follows:

[0112] A real machine test module 110 is used to obtain the active power of the generator of the hydro-generator set under different relay strokes through real machine testing, and to construct a relay stroke and generator active power curve;

[0113] A conversion processing module 120 is used to convert the servomotor stroke and the generator active power curve to obtain the relationship between the servomotor stroke and the turbine unit torque;

[0114] The characteristic curve acquisition module 130 is used to acquire the turbine torque characteristic curve under different guide vane openings according to the comprehensive characteristic curve of the turbine model;

[0115] An interpolation processing module 140 is used to perform interpolation processing on the turbine torque characteristic curve according to the turbine unit torque under different relay strokes to obtain the relationship between the guide vane opening and the turbine unit torque;

[0116] The relationship identification module 150 is used to obtain the relationship between the guide vane opening and the relay stroke according to the relationship between the relay stroke and the turbine unit torque and the relationship between the guide vane opening and the turbine unit torque.

[0117] In an optional implementation, the conversion processing module 120 includes the following submodules, and the detailed description of each functional submodule is as follows:

[0118] The curve processing submodule is used to obtain the generator efficiency curve, and obtain the generator efficiency under different working conditions from the generator efficiency curve;

[0119] The output conversion submodule is used to input the generator efficiency into a preset turbine output conversion model to obtain the turbine output corresponding to the generator active power;

[0120] The unit torque conversion submodule is used to obtain the unit torque of the turbine under different relay strokes according to the preset torque and output conversion model and the preset unit torque conversion model, and to construct the relationship between the relay stroke and the unit torque of the turbine.

[0121] In an optional implementation, the characteristic curve acquisition module 130 includes the following submodules, and the detailed description of each functional submodule is as follows:

[0122] A comprehensive characteristic curve acquisition submodule is used to acquire a comprehensive characteristic curve of a turbine model;

[0123] The parameter matrix construction submodule is used to obtain the unit flow, unit speed and operating point efficiency of the turbine from the comprehensive characteristic curve of the turbine model along the opening lines of different guide vanes, and to construct the unit flow matrix, unit speed matrix and operating point efficiency matrix;

[0124] A matrix conversion submodule, used for inputting a unit flow matrix, a unit speed matrix and an operating point efficiency matrix into a preset unit torque conversion model to obtain a unit torque matrix of the turbine;

[0125] The torque characteristic curve construction submodule is used to construct the turbine torque characteristic curve based on the unit speed matrix and the unit torque matrix.

[0126] In an optional implementation, the interpolation processing module 140 includes the following submodules, and the detailed description of each functional submodule is as follows:

[0127] The primary processing submodule is used to interpolate the target unit speed matrix corresponding to different guide vane opening lines in the turbine torque characteristic curve according to the turbine unit torque obtained by the real machine test;

[0128] The unit speed calculation submodule is used to calculate the target unit speed of the real machine test under the water head condition;

[0129] The secondary processing submodule is used to interpolate the guide vane opening corresponding to the unit torque of the turbine according to the target unit speed and the target unit speed matrix, and to construct the relationship between the guide vane opening and the unit torque of the turbine.

[0130] The apparatus of the above-mentioned embodiment is used to implement the corresponding method in the above-mentioned embodiment, and has the beneficial effects of the corresponding method embodiment, which will not be described in detail here.

[0131] 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 invention (including the claims) is limited to these examples. Under the concept of the present invention, 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 different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0132] The embodiments of the present invention 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 invention should be included in the protection scope of the present invention.

Claims

1. A method for identifying the relationship between the guide vane opening and the servomotor stroke of a water turbine, characterized in that: include: The active power of the generator of the hydro-turbine generator set under different relay strokes is obtained through real machine testing, and the relay stroke and generator active power curve is constructed; Converting the servomotor stroke and the generator active power curve to obtain the relationship between the servomotor stroke and the turbine unit torque; According to the comprehensive characteristic curve of the turbine model, the turbine torque characteristic curve under different guide vane openings is obtained; Interpolating the turbine torque characteristic curve according to the turbine unit torque under different servomotor strokes to obtain the relationship between the guide vane opening and the turbine unit torque; According to the relationship between the servomotor stroke and the unit torque of the turbine and the relationship between the guide vane opening and the unit torque of the turbine, the relationship between the guide vane opening and the servomotor stroke is obtained; The converting process of the servomotor stroke and the generator active power curve to obtain the relationship between the servomotor stroke and the turbine unit torque includes: Obtaining a generator efficiency curve, and obtaining the generator efficiency under different working conditions from the generator efficiency curve; Inputting the generator efficiency into a preset turbine output conversion model to obtain the turbine output corresponding to the generator active power; According to a preset torque and output conversion model and a preset unit torque conversion model, the unit torque of the turbine under different servomotor strokes is obtained, and a relationship between the servomotor stroke and the unit torque of the turbine is established; The turbine output conversion model is: ， in, The turbine output is is the generator active power, is the generator efficiency; The torque and output conversion model is: ， in, is the turbine torque, is the turbine speed; The unit moment conversion model is: ， in, is the unit torque of the turbine, is the runner diameter of the turbine, is the water head condition of the turbine.

2. The method for identifying the relationship between the guide vane opening and the servomotor stroke of a water turbine according to claim 1, characterized in that: The step of obtaining the turbine torque characteristic curve under different guide vane openings according to the comprehensive characteristic curve of the turbine model includes: Obtain comprehensive characteristic curve of turbine model; The unit flow, unit speed and operating point efficiency of the turbine are obtained from the comprehensive characteristic curve of the turbine model along different guide vane equal opening lines, and a unit flow matrix, a unit speed matrix and an operating point efficiency matrix are constructed; Inputting the unit flow matrix, the unit speed matrix and the operating point efficiency matrix into a preset unit torque conversion model to obtain a unit torque matrix of the hydraulic turbine; A turbine torque characteristic curve is constructed according to the unit speed matrix and the unit torque matrix.

3. The method for identifying the relationship between the guide vane opening and the servomotor stroke of a water turbine according to claim 2, characterized in that: The unit torque conversion model is: , in, is the unit moment matrix, is the unit flow matrix, is the unit speed matrix, is the efficiency matrix of the operating point, is the conversion factor.

4. The method for identifying the relationship between the guide vane opening and the servomotor stroke of a water turbine according to claim 1, characterized in that: The interpolation process is performed on the turbine torque characteristic curve according to the turbine unit torque under different servomotor strokes to obtain the relationship between the guide vane opening and the turbine unit torque, including: According to the unit torque of the turbine obtained by the real machine test, the target unit speed matrix corresponding to different guide vane opening lines is interpolated in the turbine torque characteristic curve; Calculate the target unit speed of the real machine test under the water head condition; According to the target unit speed and the target unit speed matrix, the guide vane opening corresponding to the unit torque of the turbine is interpolated, and a relationship between the guide vane opening and the unit torque of the turbine is constructed.

5. The method for identifying the relationship between the guide vane opening and the servomotor stroke of a water turbine according to claim 4, characterized in that: The calculation formula of the target unit speed is: , in, is the target unit speed, is the rotation speed of the hydro-generator set, is the runner diameter of the turbine, is the water head condition of the turbine.

6. A device for identifying the relationship between the guide vane opening and the servomotor stroke of a water turbine, characterized in that: include: The real machine test module is used to obtain the active power of the generator of the hydro-generator set under different relay strokes through real machine testing, and to construct the relay stroke and generator active power curve; A conversion processing module, used for converting the servomotor stroke and the generator active power curve to obtain the relationship between the servomotor stroke and the turbine unit torque; A characteristic curve acquisition module is used to acquire a turbine torque characteristic curve under different guide vane openings according to a comprehensive characteristic curve of a turbine model; An interpolation processing module, used for interpolating the turbine torque characteristic curve according to the turbine unit torque under different servomotor strokes to obtain the relationship between the guide vane opening and the turbine unit torque; a relationship identification module, for obtaining a relationship between the guide vane opening and the servomotor stroke according to the relationship between the servomotor stroke and the unit torque of the turbine and the relationship between the guide vane opening and the unit torque of the turbine; The converting process of the servomotor stroke and the generator active power curve to obtain the relationship between the servomotor stroke and the turbine unit torque includes: Obtaining a generator efficiency curve, and obtaining the generator efficiency under different working conditions from the generator efficiency curve; Inputting the generator efficiency into a preset turbine output conversion model to obtain the turbine output corresponding to the generator active power; According to a preset torque and output conversion model and a preset unit torque conversion model, the unit torque of the turbine under different servomotor strokes is obtained, and a relationship between the servomotor stroke and the unit torque of the turbine is established; The turbine output conversion model is: ， in, The turbine output is is the generator active power, is the generator efficiency; The torque and output conversion model is: ， in, is the turbine torque, is the turbine speed; The unit moment conversion model is: ， in, is the unit torque of the turbine, is the runner diameter of the turbine, is the water head condition of the turbine.

7. The device for identifying the relationship between the guide vane opening and the servomotor stroke of a water turbine according to claim 6, characterized in that: The conversion processing module includes: A curve processing submodule, used to obtain a generator efficiency curve, and obtain the generator efficiency under different working conditions from the generator efficiency curve; An output conversion submodule, used for inputting the generator efficiency into a preset turbine output conversion model to obtain the turbine output corresponding to the active power of the generator; The unit torque conversion submodule is used to obtain the unit torque of the turbine under different relay strokes according to the preset torque and output conversion model and the preset unit torque conversion model, and to construct the relationship between the relay stroke and the unit torque of the turbine.

8. The device for identifying the relationship between the guide vane opening and the servomotor stroke of a water turbine according to claim 6, characterized in that: The characteristic curve acquisition module comprises: A comprehensive characteristic curve acquisition submodule is used to acquire a comprehensive characteristic curve of a turbine model; A parameter matrix construction submodule is used to obtain the unit flow, unit speed and operating point efficiency of the turbine along different guide vane equal opening lines on the comprehensive characteristic curve of the turbine model, and to construct a unit flow matrix, a unit speed matrix and an operating point efficiency matrix; A matrix conversion submodule, used for inputting the unit flow matrix, the unit speed matrix and the operating point efficiency matrix into a preset unit torque conversion model to obtain a unit torque matrix of the turbine; The torque characteristic curve construction submodule is used to construct a turbine torque characteristic curve according to the unit speed matrix and the unit torque matrix.

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