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Dynamic closing curve optimizing method of guide vanes

A technology of guide vane closing and optimization method, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of insufficiency and low efficiency of guide vane dynamic closing curve

Active Publication Date: 2016-06-08
DONGFANG ELECTRIC MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing guide vane dynamic closing curve optimization method is not efficient and can no longer meet the actual needs of the project

Method used

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  • Dynamic closing curve optimizing method of guide vanes
  • Dynamic closing curve optimizing method of guide vanes
  • Dynamic closing curve optimizing method of guide vanes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] As a preferred embodiment of the present invention, this embodiment discloses:

[0042] The method for optimizing the dynamic closing curve of the guide vane includes the following steps:

[0043] Step A: Parametrize and vary the dynamic closing curve of the guide vane: the dynamic closing curve of the guide vane is composed of N straight lines; the parameterization and variableization refer to transforming the dynamic closing curve of the guide vane into (2N-1 ) control variables, the (2N-1) control variables include N time variables T 1 , T 2 , T 3 …T N and (N-1) inflection point variables Y 1 , Y 2 , Y 3 ...Y N-1 ; N≥1, N is an integer; T 1 , T 2 , T 3 …T N Respectively refer to the time when the 1st, 2nd, 3rd...N straight line in the guide vane closing curve is closed from 100% of the full stroke to 0 relative to the servomotor; the inflection point variable Y 1 , Y 2 , Y 3 ...Y N-1 Respectively refer to the servomotor travel corresponding to the inte...

Embodiment 2

[0058] As another preferred embodiment of the present invention, with reference to the attached figure 1 , this embodiment discloses: when the dynamic closing curve of the guide vane is composed of a straight line, the optimization method for the dynamic closing of a straight line of the guide vane is:

[0059] Step A: Parametrize and change the dynamic closing curve of the guide vane, so that the closing curve of the guide vane can be transformed into the control variable T 1 ,T 1 Refers to the time from 100% of the full stroke to 0 relative to the servomotor;

[0060] Step B: Set T 1 is a one-dimensional array, that is, T 1 =T 1 [M 1 ], length M 1 ;

[0061] Step C: Initialize T 1 [m 1 ](0≤m 1 1 ) to make it from m 1 =0 start loop calculation till m 1 = M 1 -1 ends; one-to-one correspondence will be T 1 [M 1 ] converted to t 1 [m 1 ],t 1 [m 1 ] is the time consumed by the servomotor from 100% off to 0 position;

[0062] Step D: Set the control variable t ...

Embodiment 3

[0065] As another preferred embodiment of the present invention, with reference to the attached figure 2 , this example discloses:

[0066] When the dynamic closing curve of the guide vane is composed of two broken lines, the optimization method for the dynamic closing of the two broken lines of the guide vane is:

[0067] Step A: Parametrize and change the dynamic closing curve of the guide vane, so that the closing curve of the guide vane can be transformed into the control variable T 1 , T 2 and Y 1 ,T 1 Indicates the time when the first segment of the closing line is closed from 100% of the full stroke to 0 relative to the servomotor, T 2Indicates the time when the second segment of the closing line is closed from 100% of the full stroke to 0 relative to the servomotor, Y 1 Indicates the stroke of the servomotor corresponding to the intersection of the first segment and the second segment of the straight line;

[0068] Step B: Set T 1 is a one-dimensional array, th...

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Abstract

The invention discloses a dynamic closing curve optimizing method of guide vanes and relates to the technical field of water turbine guide vane closing. According to the method, dynamic closing curves of the guide vanes are parameterized and variationized, wherein the dynamic closing curves of the guide vanes are composed of N straight lines; according to parameterization and variationization, the dynamic closing curves of the guide vanes are converted into (2N-1) control variables, the control variables are transmitted into transient flow calculating software to calculate and make statistics on results, extreme values of volute inlet pressure, draft pipe inlet pressure and unit rotating speed corresponding to all the guide vane closing curves are output within the given range, the output extreme values and guarantee values calculated and required in the transition process are compared, and the optimal guide vane closing curve is selected. The optimized calculation program can call the commercialized transient flow calculation software many times, multiple progresses carry out calculation at the same time, calculation efficiency is improved greatly, and the labor amount of calculating researchers is reduced greatly.

Description

technical field [0001] The invention relates to the technical field of hydraulic turbine guide vane closing, in particular to a method for optimizing the dynamic closing curve of guide vanes. Background technique [0002] The calculation of the transition process of the hydropower station is to ensure that the parameters such as the speed increase, the pressure increase of the volute inlet and the inlet pressure of the draft tube are within the specified parameters during the load rejection process of the unit under various complex working conditions by selecting the optimal dynamic closing curve of the guide vane. within the safe range. At present, the optimization of the guide vane closing curve mainly relies on the experience of the research personnel or referring to the closing laws of similar hydropower stations, and then through repeated manual trial calculations, so as to select a relatively suitable closing curve within the limited trial calculation range. law. The...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 张建文树洁凡家异王伦其陈太平
Owner DONGFANG ELECTRIC MACHINERY
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