Practical method of estimating fluctuations in hydroelectric station tailbay levels

Conclusions

• 1. The fluctuations in HES tailbay level may be considered as a transfer process of a linear item of automatic regulation, the input signal of which is a sequence of HES discharge values, and the outgoing signals a sequence of HES tailbay levels.

• 2. The outgoing signal of this object may be expressed in terms of the incoming signal, and the pulse characteristic, obtained from known records of successive discharges and levels for one segment of time may be used for forecasting the level in another future segment.

• 3. The proposed method is distinguished by simplicity and high speed of forecasting the tailbay level (the principal labor-consuming operation is the determination of the pulse characteristic, but is is possible to use it over some period of time).

• 4. A minimum of initial information is required: for determining the pulse characteristic, a record of discharges and levels; for forecasting the levels, the pulse characteristic, a record of discharges, and the linkage curve for the given site. The method is applicable to any site.

• 5. Tailbay fluctuations may be analyzed by means of linear differential equations, transfer functions, and frequency responses.