SENSITIVITY ANALYSIS OF AN OPTIMAL SHORT-TERM HYDROTHERMAL SCHEDULE

This paper deals with the sensitivity analysis of an optimal short ter m hydro-thermal schedule. Methodological and practical aspects of syst em economy losses (SEL) calculation caused by incorrect input data are investigated. It was shown and checked by numerical simulations that errors in the hydro plant characteristics can be studied through error s in the short term load forecasting. In a special case when different iability conditions are satisfied (economic dispatching problem) analy tical formulae for the SEL are developed. Some of the important result s of sensitivity calculations concerning relevant errors in thermal co st coefficients, hydro plant characteristics, forecasted water inflows and forecasted system demands are presented. The critical input data have been selected and their tolerance margins established in order to preserve the beneficial effects of an optimal short term schedule.