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Deflector mathematic model in load shedding process of impact type hydroelectric machine

A technology of mathematical models and deflectors, applied in electrical digital data processing, instruments, special data processing applications, etc., to achieve the effect of easy calculation, simple steps, and easy determination

Active Publication Date: 2014-05-28
YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST +1
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Problems solved by technology

[0004] The purpose of the present invention is to propose a mathematical model of deflection device when the impact type hydroelectric motor is used for power system stability calculation, which solves the problem of the deflection device mathematical model when the impact type hydroelectric motor is used for power system calculation. blank

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  • Deflector mathematic model in load shedding process of impact type hydroelectric machine
  • Deflector mathematic model in load shedding process of impact type hydroelectric machine
  • Deflector mathematic model in load shedding process of impact type hydroelectric machine

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Embodiment Construction

[0027] A mathematical model of the deflection device when the impact type hydroelectric motor is shedding the load. The feature of the present invention is that the influence coefficient of the water flow rushing to the bucket after passing through the nozzle to the work done by the bucket under the action of the deflection device is determined by the remaining water column. The per unit value of the area is expressed as the following formula:

[0028] ρ=(1-ξ) v

[0029] Among them, ρ—the influence coefficient of the deflector on the water flow; ξ—the percentage of the water retaining area of ​​the deflector in the total water column during the rotation; v—influence factor;

[0030] The influence factor is that the water blocked by the deflector will flow along the baffle, and this part of the water flow may impact the other part of the water flow rushing towards the water bucket to do work, forming a reaction force to the water bucket. It increases rapidly toward the increa...

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Abstract

The invention discloses a deflector mathematic model in the load shedding process of an impact type hydroelectric machine. According to the content, the influence coefficient on work done on a bucket of water flows rushing at the bucket after passing through a nozzle under the action of a deflector is expressed with a per unit value of a remaining water column area. The water retaining area of the deflector in the rotating process is related to the included angle of a water column, and the included angle of the water column can be determined through the angle by which a drift plate rotates around a fixed base point horizontally counterclockwise, the time from full-open to full-close of the deflector, the action time of the deflector and the opening degree of spray needles, and the angle, the time from full-open to full-close, the action time and the opening degree are easy to test.

Description

Technical field [0001] The invention relates to a mathematical model of a deflection device during load shedding of an impact hydroelectric motor mainly used for power system stability calculation. Background technique [0002] Power system simulation calculation is a basic tool for power system dynamic analysis safety control. Power system modeling is the basis of simulation calculation. If the model is not accurate enough, qualitative conclusions may be changed in critical situations or when accident characteristics are reproduced. The impact type hydroelectric unit occupies a certain proportion in the power grid in Southwest China. In some areas where the grid capacity is small and prone to isolated grid operation, the control law and action process of the impact type unit are of great significance for the analysis of grid fluctuations. This is important for power system simulation calculations. Higher requirements are put forward with the related model of impact hydroele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 刘兴福何常胜张江滨董鸿魁舒荣
Owner YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST
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