Development of mathematical methods of investigating transients in surge tanks of hydroelectric stations

Conclusions

• 1. An analysis of successive combinations of transients makes it possible to increase the speed and reliability of the operation of hydrostations with surge tanks in the case of emergency situations in the power system.

• 2. At operating hydrostations with surge tanks and branched penstocks a programmed regime of increase of the load in several phases permits building up the full power of all units of the hydrostations in a minimum time interval while providing permissible oscillations of the level in the tank.

• 3. When designing surge tanks it is advisable to assign the minimum elevation of the level in them from conditions of providing the simultaneous start-up and increase of the load by all units of the hydrostation, which permits maximum use of their maneuvering possibilities.

• 4. For hydrostations at which the simultaneous start-up and increase of load by units with a common diversion conduit is possible, a check of the operation of the tank for dumping of the load after its full increase for the most unfavorable lag time should be accomplished on mathematical models; for the combination “increase of load after dumping” a lag time which provides a drop of the level in the tank not below the elevation corresponding to the design increase of load is calculated and introduced into the technological automation system.